Front inclined strut with axial force converter and construction method of front inclined strut

Abstract

The invention relates to a front inclined strut containing an axial force converter and a construction method of the front inclined strut, the front inclined strut is an inclined support arranged in a foundation pit, the upper end of the front inclined strut is connected with an enclosing purlin, the lower end of the front inclined strut is arranged in a soil body below the pit bottom, and the front inclined strut comprises the axial force converter and an inclined strut rod body; the axial force converter is arranged between the upper end part of the diagonal bar body and the enclosing purlin, has the functions of detecting the axial bearing capacity of the front diagonal bar, applying the prestress, servo the axial force and the like, and is suitable for various front diagonal bars of which the bottom ends of the diagonal bar bodies are expanded or not expanded. The axial force converter can be repeatedly used, surrounding purlin construction and diagonal bracing bearing capacity detection are facilitated, and meanwhile the bearing capacity of the diagonal bracing rod body, surrounding purlin safety and construction quality can be improved; the method has remarkable and prominent social benefits and economic benefits.

Description

Technical Field

[0001] The invention relates to the technical field of foundation pit engineering, and in particular to a front diagonal brace containing an axial force converter and a construction method thereof. Background Art

[0002] The foundation pit support (or foundation pit enclosure) in foundation pit engineering occupies an important part in the construction cost and construction period. When the foundation pit enclosure pile wall adopts the support type without support points and cannot meet the requirements of safety and environmental protection, it is necessary to add support points to reduce the bending moment and shear force of the enclosure pile wall and provide the anti-overturning capacity of the support structure. Among them, the internal support is the main form of support, including flat support (horizontal support) and diagonal support (the axis of the diagonal support has an angle with the horizontal plane).

[0003] At present, the industry's diagonal bracing is divided into traditional post-placed diagonal bracing (leaving a slope during earth excavation and then setting diagonal bracing, including diagonal throw bracing) and pre-placed diagonal bracing (completed before earth excavation and begins to play a supporting role). Since pre-placed diagonal bracing is constructed and plays a role before earth excavation, it has the significant advantages of facilitating earth excavation, shortening construction period, and more effectively reducing deformation of retaining pile walls.

[0004] In actual projects, the top of the front diagonal brace is embedded in the concrete crown beam. Due to the influence of factors such as the type of retaining piles (cast-in-place piles, SMW method piles), the spacing of retaining piles, and the position error of the diagonal brace construction, it is often difficult to set the top of the diagonal brace inside the crown beam, and it is difficult to avoid setting it on the inside of the crown beam (on the side of the foundation pit). This will inevitably cause the main reinforcement on the inside or bottom of the crown beam to conflict with the position of the front diagonal brace, resulting in the main reinforcement on the inside of the crown beam cannot be connected normally, thus bringing defects in the force performance of the crown beam and safety hazards. Even if a concrete corbel is made on the inside of the crown beam, the steel bar binding and formwork support of the crown beam will become complicated and cumbersome, the construction convenience will be reduced, and the construction period will be prolonged. Therefore, it is necessary to study new structures and methods to improve the connection between the front diagonal brace and the crown beam to a safer, more reliable and more convenient level.

[0005] On the other hand, the bearing capacity test of the front diagonal brace usually involves cutting the brace off for axial bearing capacity test, which increases the workload, cost and construction period, thus causing inconvenience. In addition, since cutting and reconnecting increase the number of joints, the integrity and stress safety of the diagonal brace rod are also reduced, posing a safety hazard.

[0006] The use of large and small diameter steel pipe socket connection for axial bearing capacity testing not only increases costs, but also complicates the construction and testing procedures. In addition, this connection structure can only be set up for the front diagonal brace at a specific location of the predetermined test. It has no universal applicability and no axial force conversion setting. It is impossible to apply prestress to the front diagonal brace or set up an axial force servo system. More importantly, if the rod body of the front diagonal brace adopts a hollow tube body (such as an empty steel pipe), this detection connection structure is difficult to implement in practice.

[0007] In view of the above problems, the present invention will provide some new innovative technologies to improve the defects and shortcomings of the existing technology, simplify the connection between the front diagonal brace and the purlin (crown beam), simplify the detection method of the axial bearing capacity, and at the same time have the structure and function of applying prestress and implementing axial force servo. Summary of the invention

[0008] The purpose of the present invention is to overcome the shortcomings and deficiencies in the prior art and to provide a front diagonal brace and a construction method thereof having an assembled connection structure for connecting the front diagonal brace and the purlin (crown beam), that is, a front diagonal brace and a construction method thereof containing an axial force converter, thereby saving costs, facilitating construction and testing, and having better mechanical properties and better foundation pit deformation control effect.

[0009] A front diagonal brace containing an axial force converter, characterized in that the front diagonal brace is an oblique support arranged inside a foundation pit, comprising an axial force converter and a diagonal brace rod body; the upper end of the diagonal brace rod body is connected to the axial force converter, and the lower end is arranged in the soil below the bottom of the pit; the axial force converter is arranged between the upper end of the diagonal brace rod body and a surrounding purlin (divided into a crown beam and a waist beam), and is used to detect the axial bearing capacity of the front diagonal brace, apply axial prestress, adjust the axial force of the front diagonal brace and control the deformation of the front diagonal brace, and is suitable for various front diagonal braces with expanded and non-expanded bottom ends of the diagonal brace rod bodies; the surrounding purlin is a concrete structure or a steel structure.

[0010] The axial force converter includes an axial force conversion base, an axial force adjustment lock and an axial force applicator, the axial force applicator provides a first axial force transmission route, and the axial force adjustment lock provides a second axial force transmission route; the axial force conversion base is arranged at the bottom (or lower part) of the axial force converter, and its inner side (one side of the foundation pit) is connected to the diagonal support rod body, and the axial force of the front diagonal support is converted into the force of the first axial force transmission route and the second axial force transmission route respectively; the first axial force transmission route is arranged in the middle of the axial force conversion base; the second axial force transmission route is arranged on both sides of the first axial force transmission route; the longitudinal axis of the axial force conversion base is perpendicular to the longitudinal axis of the diagonal support rod body; the axial force converter is used for adjusting the axial force size and the axial force conversion between the first axial force transmission route and the second axial force transmission route, and the axial force direction between the first axial force transmission route and the second axial force transmission route is parallel to the axial force direction of the diagonal support rod body.

[0011] Furthermore, the first axial force transmission route and the second axial force transmission route may be interchanged in position, and the function of axial force conversion can still be achieved.

[0012] Furthermore, the axial force adjustment locker is symmetrically arranged on both sides of the axial force converter; the axial force conversion base is strip-shaped, and the middle part of its outer side (close to the side of the purlin) is used to resist the bottom end of the axial force applicator (such as a jack), and its two outer ends are connected to the axial force adjustment locker; a limited support is arranged in the middle part of the inner side (close to the side in the pit) of the axial force conversion base, which is used to limit the lateral (vertical to the longitudinal axis of the diagonal support rod body) movement between the upper end of the diagonal support rod body and the axial force conversion base; the axial force conversion base is connected to the diagonal support rod body through the limited support, and the connection method is internal insertion type or external packaging type; the internal insertion type means that the diagonal support rod body is a tube body, and the limited support is inserted into the tube body to limit the lateral displacement of the axial force conversion base and the diagonal support rod body; the external packaging type means that the limited support is a tube body, and the tube body of the limited support covers the upper end of the diagonal support rod body to limit the lateral displacement between the axial force conversion base and the diagonal support rod body.

[0013] Furthermore, a length adjuster is provided between the axial force conversion base and the diagonal brace body to solve the problem of insufficient length of the diagonal brace body caused by construction errors during the placement of the diagonal brace body; the length adjuster is composed of at least one adjustment section, the first end of each adjustment section is the tube body of the adjustment section, and the second end is the insert body of the adjustment section, the cross section of the adjustment section is rectangular or circular, and the material is steel, concrete or steel-concrete composite material. The outer contour (rectangular cross section or circular cross section) size of the insert body of the adjustment section is smaller than the inner contour (rectangular cross section or circular cross section) size of the tube body of the adjustment section, multiple adjustment sections are connected end to end, and the insert body of the adjustment section is inserted into the tube body of the adjacent adjustment section to complete the adjustment of the length of the diagonal brace body.

[0014] Furthermore, the axial force adjustment locker includes a force transmission member, an adjustment member and a locker;

[0015] The force transmission member is a strip-shaped member, which is arranged in pairs on both sides of the axial force converter, with its lower end connected to the axial force conversion base and its upper end against the adjusting member; a groove is arranged at the upper end of the force transmission member, which is used to place the adjusting member and limit the horizontal movement or rotation of the adjusting member, and does not limit the movement of the adjusting member in the vertical plane along the groove direction (the direction parallel to the bottom plane of the groove); the force transmission member is a solid type or a lattice type, and the cross-sectional shape is plate-shaped, rectangular, groove-shaped, I-shaped, etc.; the material of the force transmission member is steel or a steel-concrete composite material.

[0016] The lower end of the force transmission member is connected to the axial force conversion base, and a bottom plate perpendicular to the vertical plane of the force transmission member is connected between the force transmission members. The bottom plate is connected to the axial force conversion base to enhance the stability and force performance of the force transmission member and the axial force conversion base connected thereto (the force includes but is not limited to the bearing capacity of the force transmission member and the axial force conversion base), and prevent the force transmission member and the axial force conversion base from bending along the bottom plate surface (the surface where the plane of the bottom plate is located), so that the force transmission member, the axial force conversion base and the bottom plate of the axial force adjustment locker are subjected to force in a coordinated manner; the bottom plate is also used to place the axial force applying device (such as a jack); the force transmission member can be adjacent to the upper edge (top) of the axial force conversion base. Additional connecting ribs are provided to enhance the out-of-plane stability of the upper edge of the connecting member and enhance the force-bearing performance of the axial force conversion base; a temporary connecting rod is provided at the upper edge (top) of the adjusting member, and the temporary connecting rod is a steel pipe, steel rod or steel plate, which is used to enhance the out-of-plane stability of the upper edge of the force transmitting member. The temporary connecting rod can be temporarily removed when installing and disassembling the axial force applying equipment, and installed again after the axial force conversion and in the force-bearing state; a reinforcing wing plate is provided at the outer upper edge of the force transmitting member to enhance the out-of-plane stability and bearing capacity of the upper edge of the force transmitting member and the axial force conversion base; the upper end of the force transmitting member is against the purlin through the adjusting member, so as to provide the diagonal bracing rod body and the axial force converter with anti-rotation stability parallel to the longitudinal direction of the purlin.

[0017] Further, the adjusting member is configured as a wedge-shaped body (plate, etc.) that is larger at the top and smaller at the bottom, the first end of the adjusting member abuts against the inner side of the surrounding purlin (the side close to the foundation pit), and the second end is placed in the groove at the upper end of the force transmission member and abuts against the bottom of the groove; when the axial force applicator of the first axial force transmission route applies axial force, the distance between the force transmission member of the second axial force transmission route and the surrounding purlin increases, and the adjusting member automatically slides down along the inner side of the surrounding purlin and the groove of the groove under the action of its own gravity, and under the action of the locking device, the force transmission member and the surrounding purlin are automatically wedged and tightened, thereby reliably transmitting the second axial force;

[0018] When the formwork is supported on the concrete purlin, the adjusting member is temporarily fixed (by methods such as binding or spot welding) on ​​the force transmission member, and then against the inner formwork of the concrete purlin, serving as a bracket for the formwork system. It not only has the formwork supporting function, but also can ensure that after the inner formwork of the concrete purlin is removed, the adjusting member is fully consistent with the inner surface of the purlin (because the thickness of the inner formwork of the concrete purlin is equal), thereby achieving a better force transmission effect.

[0019] Furthermore, the adjusting member is fixed to the force transmission member by binding or spot welding.

[0020] Furthermore, if the inner formwork of the concrete purlin is made of a steel plate provided with anchor bars and locking support space, and is cast together with the purlin concrete, not only can the formwork be replaced without being removed, but the steel plate also serves as an embedded part of the concrete purlin, so that after the force transmission part is against the steel plate (the strength requirements are met after the purlin concrete is cast), the axial force can be directly converted and locked in one go; the anchor bars are buried in the interior of the purlin concrete to provide the steel plate with downward anti-slip force and local anti-pressure; the locking support space refers to the local protrusion of the steel plate, and the concrete space reserved for the locking support.

[0021] Furthermore, the force transmission member, bottom plate, connecting ribs and temporary connecting rod of the axial force adjustment lock are combined into one body, similar to a square cylinder or a cylinder, and the upper side opening of the square cylinder or the cylinder is used to take and place the axial force application equipment (jack). However, it should be noted that the use of a cylinder will increase the geometric dimensions of the axial force conversion base, causing inconvenience and also making the force of the axial force conversion base more complicated, reducing the safety. This is because the positions of the force transmission member, bottom plate and connecting ribs of the axial force adjustment lock of the present invention all coincide with the cross-sectional range of the diagonal support rod body at the lower end of the axial force conversion base, so that the bending, shear and punching resistance of the axial force conversion base are significantly improved, while saving materials.

[0022] Furthermore, the lock includes a locking support and a locking gasket; the locking support is an anti-slip body arranged on the inner side of the purlin, the first end of which is connected to the purlin, and the second end is exposed outside the purlin and located above the adjusting member; the locking support is a long strip-shaped member with a rectangular, groove-shaped, I-shaped or plate-shaped cross-section, and the material is steel, concrete or a steel-concrete composite material.

[0023] The locking gasket is configured as a sheet-like steel plate or steel-concrete composite member of different thicknesses, and at least one locking gasket overlapped up and down is placed flat in the gap between the adjusting member and the locking support, so as to adjust the gap between the adjusting member and the locking support, thereby adjusting the distance between the force transmission member and the surrounding purlin; a gasket shelf groove may be provided on the side of the locking support close to the pit, and a side portion of the gasket shelf groove adjacent to the adjusting member is configured as an inclined surface or an arc surface; the gasket can be placed in the gasket shelf groove in advance, and when the gap between the adjusting member and the locking support becomes larger, the gasket automatically slides into the gasket shelf groove, and the gasket addition is more automated; the locking support and the locking gasket together prevent the adjusting member from sliding upward along the inner side of the surrounding purlin, thereby ensuring the reliable support of the surrounding purlin by the axial force adjustment locker, thereby ensuring the reliability of the front diagonal brace and the safety of the foundation pit;

[0024] Normally, the angle between the front diagonal brace and the horizontal plane (vertical inclination angle) is generally 45 degrees. In special circumstances, the adjustment or error will not exceed 5 degrees, that is, the vertical inclination angle of the front diagonal brace is between 40 and 50 degrees. The angle between the horizontal support in the foundation pit and the horizontal plane is zero degrees. The horizontal support axial force is applied vertically to the inner side of the purlin, and there is no vertical upward force component. However, the axial force direction of the front diagonal brace is generally 45 degrees from the horizontal plane. There is not only a horizontal force component, which is a truly useful force component of the front diagonal brace for foundation pit support; but also a vertical force component, which is a useless and harmful force component of the front diagonal brace for foundation pit support, which causes the upper end of the front diagonal brace to slide on the inner side of the purlin. This unfavorable situation must be solved. When the axial force adjustment locker and the purlin are only pressed against each other but not connected (if they are connected, the steel structure needs to be cut off each time it is dismantled, resulting in material loss, which makes it impossible to reuse it and increases the cost), the axial force conversion angle must be greater than the material self-locking angle, so the locking function cannot be completed, that is: if the wedge angle of the adjustment piece meets the requirement of the material self-locking angle (far less than 45 degrees), it is difficult to complete the force conversion at a 45-degree angle at one time; even if multiple wedge-shaped adjustment pieces are used in combination, it is difficult to complete, which makes the process complicated and the cost increases. If multiple wedge-shaped adjustment pieces are used in combination and meet the requirements of the self-locking angle, the upward sliding force still exists and the axial force adjustment converter has a turning angle close to 45 degrees, and the force transmission piece has a bending moment in the vertical plane. Solving the problem of bending resistance will increase the material consumption and reduce the safety. Therefore, the axial force bearing component is the most economical. The coordinated use of the adjusting member and the locking support of the present invention effectively solves this problem: through the use of the locking support and the locking gasket, the present invention can use only a single-section adjusting member to prevent the upward sliding force of the upper end of the front diagonal brace; that is, the adjusting member, the locking gasket and the locking support are used together to simultaneously complete the triple functions of axial force adjustment of the front diagonal brace, 45-degree conversion of the axial force and preventing the adjusting member from sliding upward.

[0025] When the construction of the purlin is completed, first install the locking support (this step is not required for the cast-in locking support), and then place the wedge-shaped adjustment piece into the groove of the force transmission piece and against the inner side of the purlin. When the axial force applicator of the first axial force transmission route applies axial pressure to the front diagonal brace, the distance between the force transmission piece of the axial force adjustment locker of the first axial force transmission route, the axial force conversion base and the diagonal brace rod body as a whole and the purlin is increased, and the adjustment piece of the axial force adjustment locker slides downward along the inner side of the purlin and the bottom of the groove of the force transmission piece under the action of its own weight, wedging the gap, and then inserting a locking gasket between the adjustment piece and the locking support (the thickness and quantity of the locking gasket are selected according to the size of the gap) to ensure that the upward sliding force of the adjustment piece is transmitted to the locking support through the locking gasket.

[0026] The axial force adjustment lock, locking support and locking gasket are arranged on the inner top of the crown beam. When the axial force is applied and converted, the operator can directly stand on the top of the purlin to operate the axial force application device and insert the locking gasket. Compared with other methods, the operation is convenient, safe and easy to implement. Furthermore, a gasket placement groove with a bottom that is an arc or inclined surface inclined toward the locking support is pre-set on the side of the locking support close to the foundation pit. The locking gasket can be placed in the gasket placement groove in advance. When the adjustment part slides down and the gap between the adjustment part (or the original locking gasket) and the locking support is greater than the thickness of a single locking gasket, the locking gasket can automatically slide into the gap below the locking support by its own weight, automatically completing the increase of the locking gasket, making the axial force servo more automated.

[0027] The connection modes of the locking support and the purlin include three types: welding, insertion or casting; the first type: when the purlin is a steel purlin or a concrete purlin is provided with embedded parts (steel embedded parts), the first end of the locking support is directly welded to the embedded parts of the steel purlin or the concrete purlin; the second type: a reserved space is reserved inside the concrete purlin for the later insertion of the locking support. After the concrete purlin is demolded, the locking support is inserted into the reserved space. This is an assembled locking support, which is convenient for the construction and installation of the concrete purlin and can be reused, saving materials, reducing costs and increasing the construction and installation speed. The assembled locking support is strip-shaped; the third type: a concrete protrusion protruding from the inner side of the purlin is provided on the inner side of the concrete purlin, and the protrusion is cast into a whole with the concrete purlin, which is called a cast-in locking support;

[0028] Furthermore, the axial force conversion mechanism between the first axial force transmission route and the second axial force transmission route is as follows: when the axial force applicator applies prestress to the front diagonal brace, a first axial force transmission route is formed, and the axial force adjustment locker replaces the axial force of the first axial force transmission route, and provides a second axial force transmission route after the axial force of the first axial force transmission route is removed or fails, and provides an axial force locking function to ensure the safety and reliability of the front diagonal brace; or the axial force of the first axial force transmission route is not removed, and a double insurance system is formed with the axial force of the second axial force transmission route.

[0029] Furthermore, the axial force applicator includes an axial force applying device (such as a jack) and a load-bearing device; the lower end of the axial force applying device abuts against the axial force conversion base, and the upper end abuts against the load-bearing device; the upper end of the load-bearing device is connected to the purlin to provide axial pressure, shear force, bending resistance and other resistances, and the lower end is located in the space between the axial force adjustment lockers on both sides and abuts against the top of the axial force applying device along the longitudinal axis of the diagonal support rod body; the lower end of the load-bearing device is provided with an end plate perpendicular to the longitudinal axis of the load-bearing device, the end plate bears and evenly disperses the pressure of the axial force applying device, and abuts against the axial force adjustment lockers on both sides in a horizontal direction perpendicular to the longitudinal axis of the diagonal support rod body, limiting the movement and rotation of the axial force adjustment lockers along the direction perpendicular to the longitudinal axis of the diagonal support rod body. The cross section of the load-bearing device is T-shaped, I-shaped, or groove-shaped, that is, it includes transverse ribs and vertical ribs, which ensure the out-of-plane stability of the load-bearing device. The transverse ribs are pressed against the axial force adjustment lockers on both sides to prevent the axial force adjustment lockers from sliding horizontally perpendicular to the longitudinal axis of the force transmission member; the end plate and the transverse ribs of the load-bearing device form a whole to press against the axial force adjustment lockers on both sides, providing the force transmission member of the axial force adjustment locker with multiple functions such as anti-slip, anti-bending, and anti-torsion, so that the front diagonal brace is reliably connected to the surrounding purlin, ensuring that the diagonal brace is stable and effectively provides support;

[0030] The connection method between the load-bearing device and the concrete purlin includes a first connection method and a last connection method;

[0031] When the purlin is a concrete structure, the connection mode of the load-bearing device and the concrete purlin is set to the pre-connection type and the post-connection type; the pre-connection type means that before the inner formwork of the concrete purlin is supported and the concrete is poured, the upper end of the load-bearing device is pre-buried in the concrete space inside the inner formwork of the concrete purlin and poured in the concrete, and is combined with the inner formwork of the concrete purlin to support the inner formwork of the concrete purlin and adjust the concrete purlin according to the construction error of the end position of the front diagonal brace. The position of the inner template of the purlin allows the purlin concrete to be poured in one go and the positional relationship between the purlin and the front diagonal brace to be self-consistent, without the need for subsequent adjustments; the post-connection type means that the inner template of the concrete purlin is first supported to complete the pouring of the purlin concrete, and after the inner template of the concrete purlin is removed, the load-bearing device is directly connected (welded or bolted) to the embedded parts (steel) in the concrete purlin; when the purlin is a steel structure, the load-bearing device is directly connected to the steel structure purlin;

[0032] The stress-bearing device is arranged as an integral type or a split assembly type; the integral type means that the stress-bearing device is an integral body; it is divided into an integral first-connection type and an integral later-connection type. The integral first-connection type means that the upper end of the integral stress-bearing device passes through the hole set in the inner template of the concrete purlin, is buried in the space enclosed by the inner template of the concrete purlin, and is poured in the purlin concrete to complete the anchoring of the stress-bearing device; the integral later-connection type means that after the inner template of the concrete purlin is removed, the upper end of the integral stress-bearing device is directly welded to the embedded parts of the concrete purlin.

[0033] The split assembled load-bearing device refers to the load-bearing device comprising an upper connecting member arranged on the inner side of the concrete purlin and a lower connecting member located below the upper connecting member. The lower side of the upper connecting member (with a rectangular, grooved, T-shaped or I-shaped cross section) is arranged in parallel contact with the upper side of the lower connecting member, and bolt holes perpendicular to the longitudinal axis of the diagonal support rod body are respectively arranged on the contacting surfaces. The upper connecting member and the lower connecting member are fixedly connected together by connecting bolts, which is called a load-bearing device with an inclined plate-type upper connecting member. It is a combination of pre-connection and post-connection, that is, the upper connecting member is connected to the concrete of the surrounding purlin by a pre-connection method, and the lower connecting member is connected to the upper connecting member by a post-connection method; further, the bolt hole of the upper connecting member or the lower connecting member is arranged as an oblong hole whose long direction is parallel to the longitudinal axis of the diagonal support rod body. The oblong hole allows the lower connecting member to be longitudinally displaced with the upper connecting member after the upper connecting member is connected to the concrete surrounding purlin, and the position of the lower connecting member of the load-bearing device along the longitudinal axis of the diagonal support rod body can still be adjusted so that the lower connecting member directly abuts against the surrounding purlin, effectively solving the accuracy problem caused by the construction error of the upper connecting member and improving the fault tolerance rate. When the bolt hole adopts an oblong bolt hole, since the lower connecting piece can be directly pressed against the purlin concrete, the cross-sectional size of the upper connecting piece can be smaller. When it is set as a long flat member parallel to the inner longitudinal main reinforcement of the concrete purlin, it can be set between the main reinforcements of adjacent purlins without affecting the continuity of the main reinforcement (no need to disconnect the main reinforcement and then weld it or bypass it), and when the pre-connection connection method is adopted, the hole reserved in the inner template of the concrete purlin is smaller, which is more convenient for construction; or, the upper connecting piece is a connecting bolt pre-embedded in the concrete purlin perpendicular to the inner side surface, and an upper end plate parallel to the inner side surface of the purlin is added to the upper end of the lower connecting piece, and a bolt hole is set on the upper end plate, and the connecting bolt is inserted into the bolt hole to lock the load-bearing device on the inner side surface of the purlin, which is called a load-bearing device with a bolt-type upper connecting piece;

[0034] The upper connecting piece can fix the lower connecting piece on the purlin. After the axial force applying device is removed, the lower connecting piece can still be fixed and hung on the purlin through the upper connecting piece. This is used for subsequent multiple axial force applications to prevent the load-bearing device from moving back and forth with the axial force applying device, thereby increasing the complexity and inconvenience of the operation.

[0035] Compared with the integral stress-bearing device, since the split assembled stress-bearing device includes an upper connecting piece and a lower connecting piece, only the upper connecting piece can be pre-buried in the concrete enclosure purlin, and only the upper connecting piece is used as a consumable material, and the lower connecting piece can be kept intact and reused; if the integral stress-bearing device is welded or pre-buried in the concrete enclosure purlin, the entire integral stress-bearing device will be cut and damaged when it is removed, and the stress-bearing device will become a consumable material and cannot be reused, thereby increasing the cost, so the split assembled stress-bearing device saves costs. The material of the stress-bearing device is steel or a steel-concrete composite material.

[0036] Compared with the post-connected load-bearing device, the pre-connected load-bearing device is considered in a unified manner with the support of the inner side formwork of the concrete purlin (i.e., the formwork support process), so it can ensure that the inner side surface of the concrete purlin and the end face of the load-bearing device are accurately controlled to fit. Moreover, since the axial force converter can be used as a supporting measure for the inner side formwork of the concrete purlin, the self-consistency between the concrete purlin and the axial force converter can be accurately controlled.

[0037] Furthermore, the processes of axial bearing capacity detection, prestressing and axial force servo are respectively as follows: when only the axial bearing capacity detection of the front diagonal brace is performed, the axial force applicator applies axial detection pressure to the front diagonal brace, and after the bearing capacity detection of the front diagonal brace is completed, the axial force application equipment and the first axial force transmission route are completely removed, and the axial force adjustment locker is locked to form a second axial force transmission route; when the axial force applicator applies axial detection pressure to the front diagonal brace, after the axial bearing capacity test of the front diagonal brace is completed, the axial force applicator controls the load at a fixed value and removes part of the axial force, and the remaining axial force is the prestressing force, and then the axial force adjustment is locked. The entire locker forms a second axial force transmission route, after which the axial force application device and the first axial force transmission route are completely removed to complete the prestressing; according to the horizontal deformation of the foundation pit perimeter purlin into the foundation pit, the axial force application device and the first axial force transmission route are retained; or the axial force application device and the first axial force transmission route are removed, and the axial force application device is installed when necessary to form the first axial force transmission route, the axial force of the axial force application device is increased, the horizontal deformation of the perimeter purlin is reduced, and then the locking gasket is added to re-lock the axial force adjustment locker, and this is repeated to complete the axial force and deformation adjustment of the front diagonal brace, that is, the axial force servo is implemented.

[0038] A construction method for a front diagonal brace containing an axial force converter, characterized by comprising the following steps:

[0039] S1, construction of diagonal bracing rod;

[0040] S2. Construct concrete purlins (replace the inner formwork of the purlins with steel plates when necessary), and complete the embedding of embedded parts and the setting of locking supports;

[0041] S3. Install the length adjuster, the axial force conversion base and the force transmission member of the axial force adjustment locker on the upper end of the diagonal brace rod body respectively, and place the adjuster into the groove of the force transmission member and against the surrounding purlin;

[0042] S4, installing the load-bearing device of the axial force applicator, inserting the axial force applying device between the axial force adjustment locker and the axial force conversion base, and adjusting the axial force applying device to support the load-bearing device and the axial force conversion base to form a first axial force transmission route;

[0043] S5, the axial force applying device starts to further increase the axial force, detects the bearing capacity of the diagonal brace according to the bearing capacity detection requirements of the diagonal brace, and then controls the load, places a locking gasket between the top surface of the adjustment member and the bottom surface of the locking support, and forms a second axial force transmission route after locking is completed;

[0044] Alternatively, the axial force applying equipment starts to further increase the axial force, and detects the bearing capacity of the diagonal brace according to the bearing capacity detection requirements of the diagonal brace. Thereafter, the load is controlled to reach a predetermined axial force value, and a locking gasket is placed between the top surface of the adjustment part and the bottom surface of the locking support. After the locking is completed, a second axial force transmission route is formed, that is, prestress is applied; according to the deformation of the surrounding purlin monitored by the foundation pit, the above-mentioned steps of axial force application, adjustment and locking are repeated many times to implement the axial force servo process.

[0045] S6. When the concrete strength of the basement foundation slab or the middle floor slab reaches the requirement, start to remove the diagonal brace, load the axial force application equipment, and the locking gasket of the axial force adjustment locker will loosen. Remove the locking gasket and the adjustment part respectively, and then remove the force transmission part and the axial force conversion base, and finally remove the diagonal brace rod body; or, when the concrete strength of the foundation slab or the middle floor slab reaches the requirement, cut off and lift the diagonal brace rod body at the elevation of the top surface of the foundation slab, and the axial force adjustment locker will automatically fall off.

[0046] Another construction method of a front diagonal brace containing an axial force converter is characterized by comprising the following steps:

[0047] S1, construction of diagonal bracing rod;

[0048] S2. Install the axial force conversion base and force transmission member of the axial force converter, fix the adjustment member on the force transmission member and press against the inner template of the purlin, complete the purlin formwork and pour the purlin concrete, and complete the embedding of the embedded parts and the setting of the locking support;

[0049] S3. After removing the inner template of the purlin, place the adjusting piece into the groove of the force transmission piece and press against the purlin;

[0050] S4, installing the load-bearing device of the axial force applicator, inserting the axial force applying device between the axial force adjustment locker and the axial force conversion base, and adjusting the axial force applying device to support the load-bearing device and the axial force conversion base to form a first axial force transmission route;

[0051] S5, the axial force applying device starts to further increase the axial force, detects the bearing capacity of the diagonal brace according to the bearing capacity detection requirements of the diagonal brace, and then controls the load, places a locking gasket between the top surface of the adjustment member and the bottom surface of the locking support, and forms a second axial force transmission route after locking is completed;

[0052] Alternatively, the axial force applying equipment starts to further increase the axial force, and detects the bearing capacity of the diagonal brace according to the bearing capacity detection requirements of the diagonal brace. Thereafter, the load is controlled to reach a predetermined axial force value, and a locking gasket is placed between the top surface of the adjustment part and the bottom surface of the locking support. After the locking is completed, a second axial force transmission route is formed, that is, prestress is applied; according to the deformation of the surrounding purlin monitored by the foundation pit, the above-mentioned steps of axial force application, adjustment and locking are repeated many times to implement the axial force servo process.

[0053] S6. When the concrete strength of the basement foundation slab or the middle floor slab reaches the requirement, start to remove the diagonal brace, load the axial force application equipment, and the locking gasket of the axial force adjustment locker will loosen. Remove the locking gasket and the adjustment part respectively, and then remove the force transmission part and the axial force conversion base, and finally remove the diagonal brace rod body; or, when the concrete strength of the foundation slab or the middle floor slab reaches the requirement, cut off and lift the diagonal brace rod body at the elevation of the top surface of the foundation slab, and the axial force adjustment locker will automatically fall off.

[0054] Compared with the prior art, the advantages and effects of this application are as follows:

[0055] 1. The present invention not only creatively proposes a device and method for detecting the bearing capacity of a front diagonal brace, but also realizes functions such as applying prestress to the front diagonal brace, adjusting and controlling the axial force and deformation of the front diagonal brace for multiple times, and axial force servo of the front diagonal brace.

[0056] 2. The front diagonal brace of the present invention is directly pressed against the inner side of the purlin through an axial force converter, which is equivalent to shifting the position of the front diagonal brace as a whole into the pit by half the width of the purlin, providing a larger diagonal brace construction space within the site fence (avoiding the demolition of the fence); the present invention connects the diagonal brace rod body after the concrete purlin is constructed, which less interferes with the construction of the concrete purlin, making the construction of the concrete purlin more convenient and the construction quality better; further, the diagonal brace rod body can be constructed before the construction of the retaining piles, and the construction period and process sequence can be set more freely; in addition, the axial force converter of the present invention also solves the connection problem between the front diagonal brace and the steel purlin, and is also suitable for the situation where concrete corbels are arranged on the purlin.

[0057] 3. The axial force converter of the present invention saves material and labor costs when testing the bearing capacity, and can also improve the safety of the diagonal brace and reduce the risk of personnel in construction. It avoids the need to dig a small pit and cut off the diagonal brace rod body when testing the bearing capacity of the diagonal brace, and the safety risks and harsh working environment of the testing personnel working in the small pit; it also avoids the increase in material and labor costs caused by cutting off the diagonal brace tube body and then welding the connection.

[0058] 4. The end of the load-bearing device close to the pit of the present invention is located between a pair of force transmission members of the axial force adjustment locker, and the transverse ribs on the upper side of the load-bearing device and the end plates at the lower end thereof abut against the force transmission members on both sides, and the force transmission members can slide relative to the load-bearing device along the longitudinal axis of the diagonal brace, so that the load-bearing device not only bears the axial force along the longitudinal axis of the diagonal brace, but also the transverse ribs on the upper side of the load-bearing device and the end plates at the lower end thereof prevent the force transmission members from sliding, rotating and twisting along the longitudinal direction of the surrounding purlin (in the direction of the longitudinal axis of the surrounding purlin), thereby enhancing the stability of the front diagonal brace.

[0059] 5. The axial force adjustment locker of the present invention can not only directly transmit the force of the front diagonal brace to the purlin through the steel plate formwork to complete the functions of axial force conversion and locking; but also in the stage of supporting the formwork of the concrete purlin, the force transmission part and the adjustment part can provide the function of the formwork support, and the outer end of the adjustment part (the end close to the purlin) is against the formwork. Due to the characteristics of the thickness of the formwork, the adjustment part can be fully consistent with the inner side of the purlin after the formwork is removed, and highly self-consistent.

[0060] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application so that it can be implemented in accordance with the contents of the specification, and to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following is a detailed description of the preferred embodiments of the present application in conjunction with the accompanying drawings as follows.

[0061] Based on the detailed description of the specific embodiments of the present application in combination with the accompanying drawings below, those skilled in the art will become more aware of the above and other objects, advantages and features of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings without creative work. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0063] in:

[0064] Figure 1 It is a side view of the positional relationship between the axial force converter, the diagonal brace rod body and the surrounding purlin of the present invention;

[0065] Figure 2 A top view of the axial force converter structure without an axial force applicator of the present invention;

[0066] Figure 3 A top view of the axial force converter structure including an axial force applicator of the present invention;

[0067] Figure 4 A side view of an axial force adjustment locker of an assembled locking support of the present invention;

[0068] Figure 5 A side view of an axial force adjustment locker of a cast-in-place locking support of the present invention;

[0069] Figure 6 A side view showing the positional relationship between the adjusting member of the present invention and the inner template of the purlin;

[0070] Figure 7 A longitudinal cross-sectional view showing the structural relationship of the axial force converter of the present invention;

[0071] Figure 8 It is a side view of the integral rear-connected load-bearing device of the present invention;

[0072] Fig. 9 It is a side view of the split assembly type load bearing device with inclined plate type upper connecting member of the present invention;

[0073] Fig.10 It is a side view of the split assembled load bearing device with a bolted upper connecting member of the present invention;

[0074] Fig.11 It is a side view of the integral pre-connected load-bearing device of the present invention;

[0075] Fig.12 A top view showing the positional relationship between the axial force conversion base and the diagonal support rod body of the present invention;

[0076] Fig.13 A bottom view showing the positional relationship between the axial force conversion base and the diagonal support rod body of the present invention;

[0077] Fig.14 It is a cross-sectional view of the lower connecting member of the load-bearing device of the present invention;

[0078] Fig.15 is a side view of a wedge-shaped adjusting member of the present invention;

[0079] Fig.16 is a top view of the length adjuster of the present invention;

[0080] Fig.17 It is a vertical cross-sectional view showing the positional relationship between the gasket placement groove and the surrounding purlin and the locking support of the present invention.

[0081] Among them: 1-axial force converter; 2-diagonal support rod body; 3-purlin; 11-axial force conversion base; 12-axial force adjustment locker; 13-axial force applicator; 31-inner template of concrete purlin; 111-limit support; 112-length adjuster; 1121-tube body of adjustment section; 1122-insertion body of adjustment section; 121-force transmission member; 122-adjustment member; 123-locker; 1211-groove; 1212-bottom plate; 1213-connecting rib plate; 1214-temporary connecting rod; 1215-reinforced wing plate; 1221-wedge-shaped body; 1231-locking gasket; 1232-cast-in locking support; 1233-assembled locking support; 1234-gasket resting groove; 1235-inclined surface; 131-axial force application device; 132-load bearing device; 133-inclined plate type upper connecting piece; 134-bolted upper connecting piece; 1321-end plate; 1322-transverse rib plate; 1323-vertical rib plate; 1324-upper end plate. Specific embodiments

[0082] To make the purpose, technical scheme and advantages of the embodiment of the present application clearer, the technical scheme in the embodiment of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the present application. Obviously, the described embodiment is a part of the embodiment of the present application, rather than all of the embodiments. In the following description, specific details such as specific configuration and components are provided only to help fully understand the embodiments of the present application. Therefore, it should be clear to those skilled in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. In addition, for clarity and brevity, the description of known functions and structures is omitted in the embodiment.

[0083] It should be understood that the references to "one embodiment" or "this embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present application. Therefore, the references to "one embodiment" or "this embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0084] In addition, the present application may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplicity and clarity, and does not in itself indicate the relationship between the various embodiments and / or settings discussed.

[0085] The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist at the same time. The term " / and" in this article describes another type of association object relationship, indicating that there can be two relationships. For example, A / and B can mean: A exists alone, and A and B exist alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0086] The term "at least one" in this article is merely a description of the association relationship of associated objects, indicating that there may be three relationships. For example, at least one of A and B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0087] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusions.

[0088] Example 1

[0089] See also Figure 1 A front diagonal brace with an axial force converter, characterized in that the front diagonal brace is an oblique support arranged inside a foundation pit, comprising an axial force converter 1 and a diagonal brace rod body 2; the upper end of the diagonal brace rod body 2 is connected to the axial force converter 1, and the lower end is arranged in the soil below the bottom of the pit; the axial force converter 1 is arranged between the upper end of the diagonal brace rod body 2 and the surrounding purlin 3, and is used to detect the axial bearing capacity of the front diagonal brace, apply axial prestress, adjust the axial force of the front diagonal brace, and control the deformation of the front diagonal brace, and is suitable for various front diagonal braces with or without enlarged bottom ends of the diagonal brace rod bodies 2; the surrounding purlin 3 is a concrete structure or a steel structure. Please refer to the top view of the axial force converter 1 Figure 2 and Figure 3 For the structural relationship longitudinal section of the axial force converter 1, please refer to Figure 7 .

[0090] The axial force converter 1 includes an axial force conversion base 11, an axial force adjustment lock 12 and an axial force applicator 13, wherein the axial force applicator 13 provides a first axial force transmission route, and the axial force adjustment lock 12 provides a second axial force transmission route; the axial force conversion base 11 is arranged at the bottom of the axial force converter 1, and its inner side (the side of the foundation pit) is connected to the diagonal support rod body 2, so as to convert the axial force of the front diagonal support into the force of the first axial force transmission route and the second axial force transmission route respectively; the first axial force transmission route is arranged in the middle of the axial force conversion base 11; the second axial force transmission route is arranged on both sides of the first axial force transmission route; the longitudinal axis of the axial force conversion base 11 is perpendicular to the longitudinal axis of the diagonal support rod body 2; the axial force converter 1 is used for adjusting the axial force size and the axial force conversion between the first axial force transmission route and the second axial force transmission route, and the axial force direction between the first axial force transmission route and the second axial force transmission route is parallel to the axial force direction of the diagonal support rod body 2. For the top view and bottom view of the position relationship diagram of the axial force conversion base 11 and the diagonal support rod body 2, please refer to Fig.12 and Fig.13 .

[0091] Preferably, the first axial force transmission route and the second axial force transmission route are interchanged in position, and the function of axial force conversion can still be achieved.

[0092] Preferably, the axial force adjustment locker 12 is symmetrically arranged on both sides of the axial force converter 1; the axial force conversion base 11 is strip-shaped, and its outer side near the middle of the side of the purlin is used to resist the bottom end of the axial force applicator 13 (such as a jack), and its outer ends are connected to the axial force adjustment locker 12; a limited support 111 is arranged in the middle of the inner side (close to the side in the pit) of the axial force conversion base 11, which is used to limit the lateral (vertical to the longitudinal of the diagonal brace body 2) between the upper end of the diagonal brace body 2 and the axial force conversion base 11. The axial force conversion base 11 is connected to the diagonal support rod body 2 through a limit support 111, and the connection method is internal insertion or external packaging; the internal insertion type means that the diagonal support rod body 2 is a tube body, and the limit support 111 is inserted into the tube body to limit the lateral displacement of the axial force conversion base and the diagonal support rod body 2; the external packaging type means that the limit support 111 is a tube body, and the tube body of the limit support 111 covers the upper end of the diagonal support rod body 2 to limit the lateral displacement of the axial force conversion base and the diagonal support rod body 2.

[0093] Preferably, a length adjuster 112 is provided between the axial force conversion base 11 and the diagonal support rod body 2 to solve the problem of insufficient length of the diagonal support rod body 2 caused by construction errors during the placement of the diagonal support rod body 2. For a top view of the length adjuster, see Fig.16The length adjuster 112 is composed of at least one adjusting section, each of which has a tube body 1121 of the adjusting section at the first end and an insert body 1122 of the adjusting section at the second end. The cross section of the adjusting section is rectangular or circular, and the material is steel, concrete or a steel-concrete composite material. The outer contour size of the insert body 1122 of the adjusting section is smaller than the inner contour size of the tube body 1121 of the adjusting section. Multiple adjusting sections are connected end to end, and the insert body 1122 of the adjusting section is inserted into the tube body 1121 of the adjacent adjusting section to complete the adjustment of the length of the diagonal brace rod 2.

[0094] Preferably, the axial force adjustment locker 12 includes a force transmission member 121, an adjustment member 122 and a locker 123;

[0095] The force transmission member 121 is a strip-shaped member, which is arranged in pairs on both sides of the axial force converter 1, with its lower end connected to the axial force conversion base 11 and its upper end against the adjusting member 122; a groove 1211 is provided at the upper end of the force transmission member 121, and the groove 1211 is used to place the adjusting member 122 and limit the horizontal movement or rotation of the adjusting member 122, and does not limit the movement of the adjusting member 122 in the vertical plane along the groove 1211; the force transmission member 121 is a solid type or a lattice type, and the cross-sectional shape is plate-shaped, rectangular, groove-shaped, I-shaped, etc.; the material of the force transmission member 121 is steel or a steel-concrete composite material.

[0096] The lower end of the force transmission member 121 is connected to the axial force conversion base 11, and a bottom plate 1212 perpendicular to the vertical plane of the force transmission member 121 is connected between the force transmission members 121. The bottom plate 1212 is connected to the axial force conversion base 11 to enhance the stability and force-bearing performance of the force transmission member 121 and the axial force conversion base 11 connected thereto; the bottom plate 1212 is also used to place the axial force applying device 131; a connecting rib 1213 can be additionally provided between the upper edge of the force transmission member 121 adjacent to the axial force conversion base 11 to enhance the out-of-plane stability of the upper edge of the connecting member and enhance the force-bearing performance of the axial force conversion base 11; the adjusting member 12 2 is provided with a temporary connecting rod 1214, which is a steel pipe, steel rod or steel plate, and is used to enhance the out-of-plane stability of the upper edge of the force transmission member 121. The temporary connecting rod 1214 can be temporarily removed when installing and disassembling the axial force application device 131, and then installed and set again after the axial force conversion and in the force-bearing state; a reinforcing wing plate 1215 is provided on the outer upper edge of the force transmission member 121, and is used to enhance the out-of-plane stability and bearing capacity of the upper edge of the force transmission member 121 and the axial force conversion base 11; the upper end of the force transmission member 121 is against the purlin 3 through the adjusting member 122, so as to provide the diagonal brace and the axial force converter 1 with anti-rotation stability in the longitudinal direction parallel to the purlin 3.

[0097] Preferably, the adjusting member 122 is configured as a wedge-shaped body 1221 having a larger upper portion and a smaller lower portion, and a side view thereof can be seen in Fig.15 The first end of the adjusting member 122 abuts against the inner side of the purlin 3 (the side close to the foundation pit), and the second end is placed in the groove 1211 at the upper end of the force transmission member 121 and abuts against the bottom of the groove 1211; for a side view of the positional relationship between the adjusting member 122 and the inner side template of the purlin, please refer to Figure 6 .

[0098] Preferably, the adjusting member 122 is fixed to the force transmitting member 121 by binding or spot welding.

[0099] Preferably, the force transmission member 22, the base plate 1212, the connecting ribs 1213 and the temporary connecting rod 1214 of the axial force adjustment lock 12 are integrated into one, similar to a square cylinder or a cylinder, and the upper side opening of the square cylinder or the cylinder is used to take and place the axial force application device 131.

[0100] Preferably, the positions of the force transmission member 22, the base plate 1212, and the connecting ribs 1213 of the axial force adjustment lock 12 all coincide with the cross-sectional range of the diagonal support rod body 2 at the lower end of the axial force conversion base 11, so that the bending, shearing, and punching resistance of the axial force conversion base 11 are significantly improved while saving materials.

[0101] Preferably, the locker 123 includes a locking support and a locking gasket 1231; the locking support is an anti-slip body arranged on the inner side of the purlin 3, the first end of which is connected to the purlin 3, and the second end is exposed outside the purlin 3 and is located above the adjustment member 122; the connection method between the locking support and the purlin 3 includes welding, insertion or casting; the locking support is a long strip member with a rectangular, groove-shaped, I-shaped or plate-shaped cross-section, and the material is steel, concrete or a steel-concrete composite material.

[0102] The locking gasket 1231 is configured as a sheet of steel plates or steel-concrete composite components of different thicknesses, and at least one locking gasket 1231 overlapped up and down is placed flat in the gap between the adjusting member 122 and the locking support, and is used to adjust the gap between the adjusting member 122 and the locking support, thereby adjusting the distance between the force transmission member 121 and the surrounding purlin 3; a gasket resting groove 1234 is provided above the adjusting member 122 on the inner side of the locking support, and a side portion of the gasket resting groove 1234 adjacent to the adjusting member 122 is configured as an inclined surface 1235 or an arc surface; the locking support and the locking gasket 1231 together prevent The adjusting member 122 slides upward along the inner side of the surrounding purlin 3 to ensure that the axial force adjustment locker 12 can reliably support the surrounding purlin 3, thereby ensuring the reliability of the front diagonal brace and the safety of the foundation pit; by using the locking support and the locking gasket 1231, only the single-section adjusting member 122 can be used to prevent the upward sliding force of the upper end of the front diagonal brace; the adjusting member 122, the locking gasket 1231 and the locking support are used together to simultaneously complete the triple functions of adjusting the axial force of the front diagonal brace, converting the axial force by 45 degrees and preventing the adjusting member 122 from sliding upward; for the vertical cross-sectional view of the positional relationship between the gasket resting groove 1234 and the surrounding purlin 3 and the locking support, please refer to Fig.17 .

[0103] When the construction of the purlin 3 is completed, the locking support is installed first (this step is not required for the cast-in locking support), and then the wedge-shaped adjusting member 122 is placed in the groove 1211 of the force transmission member 121 and against the inner side of the purlin 3. When the axial force applicator 13 of the first axial force transmission route applies axial pressure to the front diagonal brace, the distance between the force transmission member 121 of the axial force adjustment locker 12 of the first axial force transmission route, the axial force conversion base 11 and the diagonal brace rod body 2 as a whole and the purlin 3 is increased, and the adjusting member of the axial force adjustment locker 12 slides downward along the inner side of the purlin and the bottom of the groove 1211 of the force transmission member 121 under the action of its own weight, wedging the gap, and then inserting the locking gasket 1231 between the adjusting member 122 and the locking support to ensure that the upward sliding force of the adjusting member 122 is transmitted to the locking support through the locking gasket 1231, wherein the thickness and number of the locking gasket 1231 are selected according to the size of the gap.

[0104] Preferably, the locking support and the locking gasket 1231 are arranged at the top of the inner side of the crown beam. When the axial force is applied and converted, the operator can directly stand on the top of the purlin to operate the axial force application device 131 and insert the locking gasket 1231. Compared with other methods, the operation is convenient, safe and easy to implement. Furthermore, a locking gasket placement groove 1234 with a bottom of an arc or inclined surface 1235 inclined toward the locking support is pre-set on the side of the locking support close to the foundation pit. The locking gasket 1231 can be placed in the gasket placement groove 1234 in advance. When the adjustment member 122 slides down and the gap between the adjustment member or the original locking gasket and the locking support is greater than the thickness of a single locking gasket 1231, the locking gasket 1231 can automatically slide into the gap below the locking support by its own weight, and automatically complete the increase of the locking gasket 1231, making the axial force servo more automated.

[0105] Preferably, the axial force applicator 13 includes an axial force applying device 131 and a force bearing device 132; the lower end of the axial force applying device 131 abuts against the axial force conversion base 11, and the upper end abuts against the force bearing device 132; the upper end of the force bearing device 132 is connected to the purlin 3 to provide axial pressure, shear resistance, bending resistance and other resistances, and the lower end is located in the space between the axial force adjustment lockers 12 on both sides and abuts against the top of the axial force applying device 131 along the longitudinal axis direction of the diagonal support rod body 2; the lower end of the force bearing device 132 is provided with an end plate 1321 perpendicular to the longitudinal axis of the force bearing device 132, the end plate 1321 bears and evenly disperses the pressure of the axial force applying device 131, and abuts against the axial force adjustment lockers 12 on both sides in the horizontal direction perpendicular to the longitudinal axis direction of the diagonal support rod body 2, limiting the movement and rotation of the axial force adjustment lockers 12 along the direction perpendicular to the longitudinal axis direction of the diagonal support rod body 2. The cross section of the load-bearing device 132 is T-shaped, I-shaped, or groove-shaped, that is, it includes a transverse rib plate 1322 and a vertical rib plate 1323, which ensures the out-of-plane stability of the load-bearing device 132. The transverse rib plate 1322 is pressed against the axial force adjustment lockers 12 on both sides to prevent the axial force adjustment lockers 12 from sliding horizontally perpendicular to the longitudinal axis of the force transmission member 121; the end plate 1321 and the transverse rib plate 1322 of the load-bearing device 132 form a whole to press against the axial force adjustment lockers 12 on both sides, providing the force transmission member 121 of the axial force adjustment locker 12 with multiple functions such as anti-slip, anti-bending, and anti-torsion, so that the diagonal brace rod body 2 is reliably connected to the surrounding purlin 3, ensuring that the diagonal brace is stable and effectively provides support;

[0106] The connection modes of the load-bearing device 132 and the concrete purlin 3 include a first connection mode and a last connection mode;

[0107] When the purlin 3 is a concrete structure, the connection mode of the force bearing device 132 and the concrete purlin 3 is set to the pre-connection type and the post-connection type; the pre-connection type means that before the inner formwork 31 of the concrete purlin is supported and the concrete is poured, the upper end of the force bearing device 132 is pre-buried in the concrete space inside the inner formwork 31 of the concrete purlin and poured in the concrete, and is combined with the inner formwork 31 of the concrete purlin, and the inner formwork of the concrete purlin is supported according to the construction error of the end position of the diagonal support rod 2. 31 and adjust the position of the inner template 31 of the concrete purlin, so that the purlin concrete can be poured in place at one time and the position relationship between the purlin and the front diagonal brace is self-consistent, and no subsequent process needs to be adjusted; the post-connection type means that the inner template 31 of the concrete purlin is first supported to complete the pouring of the purlin concrete, and after the inner template 31 of the concrete purlin is removed, the load-bearing device 132 is directly connected to the embedded parts in the concrete purlin; when the purlin 3 is a steel structure, the load-bearing device 132 is directly connected to the steel structure purlin;

[0108] The stress bearer 132 is configured as an integral type or a split assembly type; the integral type means that the stress bearer 132 is an integral body; it is divided into an integral first-connection type and an integral later-connection type. The integral first-connection type means that the upper end of the integral stress bearer passes through the hole set in the inner formwork 31 of the concrete purlin, is buried in the space enclosed by the inner formwork 31 of the concrete purlin, and is poured in the purlin concrete to complete the anchoring of the stress bearer 132; the integral later-connection type means that after the inner formwork 31 of the concrete purlin is removed, the upper end of the integral stress bearer is directly welded to the embedded parts of the concrete purlin. For a side view of the integral later-connection stress bearer, please refer to Figure 8 .

[0109] The split assembled stress bearer refers to the stress bearer 132 comprising an upper connecting piece arranged on the inner side of the concrete purlin and a lower connecting piece located below the upper connecting piece. The lower side of the upper connecting piece is arranged in parallel contact with the upper side of the lower connecting piece, and bolt holes perpendicular to the longitudinal axis of the diagonal support rod body 2 are arranged on the contacting surfaces respectively. The upper connecting piece and the lower connecting piece are fixedly connected together by connecting bolts 1325, which is called a stress bearer 132 with an inclined plate-type upper connecting piece 133; when the bolt holes are oblong bolt holes, the lower connecting piece can be directly pressed against the purlin concrete, so the cross-sectional size of the upper connecting piece can be smaller, and it can be arranged between the adjacent purlin main bars without affecting the continuity of the main bars. The upper connecting member is a connecting bolt 1325 pre-buried in the concrete purlin and perpendicular to the inner side surface, and an upper end plate 1324 parallel to the inner side surface of the purlin is additionally provided at the upper end of the lower connecting member, and a bolt hole is provided on the upper end plate 1324, and the connecting bolt 1325 is inserted into the bolt hole to lock the stress bearer 132 on the inner side surface of the purlin 3, which is called a stress bearer 132 with a bolt-type upper connecting member 134; the side view of the split assembled stress bearer with an inclined plate type upper connecting member can be seen in Fig. 9, side view of split-assembly bearing with bolted upper connection see Fig.10 For the cross-sectional view of the lower connecting member of the load-bearing device, please refer to Fig.14 .

[0110] The upper connecting piece can fix the lower connecting piece on the purlin 3. After the axial force applying device 131 is removed, the lower connecting piece can still be fixedly hung on the purlin 3 through the upper connecting piece for subsequent multiple axial force applications, thereby preventing the load-bearing device 132 from moving back and forth with the axial force applying device 131, thereby increasing the complexity and inconvenience of the operation;

[0111] Example 2

[0112] On the basis of Example 1, this example introduces an axial force adjustment locker in a front diagonal brace containing an axial force converter, wherein the axial force adjustment locker is symmetrically arranged on both sides of the axial force converter, and includes a force transmission member 121, an adjustment member 122 and a locker 123;

[0113] The force transmission member 121 is a strip-shaped member, which is arranged in pairs on both sides of the axial force converter 1, with its lower end connected to the axial force conversion base 11 and its upper end against the adjusting member 122; a groove 1211 is provided at the upper end of the force transmission member 121, and the groove 1211 is used to place the adjusting member 122 and limit the horizontal movement or rotation of the adjusting member 122, and does not limit the movement of the adjusting member 122 in the vertical plane along the groove 1211; the force transmission member 121 is a solid type or a lattice type, and the cross-sectional shape is plate-shaped, rectangular, groove-shaped, I-shaped, etc.; the material of the force transmission member 121 is steel or a steel-concrete composite material.

[0114] The lower end of the force transmission member 121 is connected to the axial force conversion base 11, and a bottom plate 1212 perpendicular to the vertical plane of the force transmission member 121 is connected between the force transmission members 121. The bottom plate 1212 is connected to the axial force conversion base 11 to enhance the stability and force performance of the force transmission member 121 and the axial force conversion base 11 connected thereto (the force includes but is not limited to the bearing capacity of the force transmission member 121 and the axial force conversion base 11), prevent the force transmission member 121 and the axial force conversion base 11 from bending along the surface direction of the bottom plate 1212, so that the force transmission member 121, the axial force conversion base 11 and the bottom plate 1212 of the axial force adjustment lock 12 are subjected to force in a coordinated manner; the bottom plate 1212 is also used to place the axial force applying device 131; the force transmission member 121 can be adjacent to the upper edge of the axial force conversion base 11. A connecting rib 1213 is additionally provided to enhance the out-of-plane stability of the upper edge of the force transmission member and enhance the force-bearing performance of the axial force conversion base 11; a temporary connecting rod 1214 is provided at the upper edge of the adjusting member 122, and the temporary connecting rod 1214 is a steel pipe, a steel rod or a steel plate, and is used to enhance the out-of-plane stability of the upper edge of the connecting member. The temporary connecting rod 1214 can be temporarily removed when installing and disassembling the axial force application device 131, and can be installed again after the axial force conversion and in the force-bearing state; a reinforcing wing plate 1215 is provided at the outer upper edge of the force transmission member 121 to enhance the out-of-plane stability and bearing capacity of the upper edge of the force transmission member 121 and the axial force conversion base 11; the upper end of the force transmission member 121 is against the purlin 3 through the adjusting member 122, so as to provide the diagonal brace and the axial force converter 1 with anti-rotation stability in the longitudinal direction parallel to the purlin 3.

[0115] Preferably, the adjusting member 122 is configured as a wedge-shaped body 1221 having a larger upper portion and a smaller lower portion, and a side view thereof can be seen in Fig.15 , the first end of the adjusting member 122 is against the inner side of the purlin 3 close to the side of the foundation pit, and the second end is placed in the groove 1211 at the upper end of the force transmission member 121 and against the bottom of the groove 1211; when the axial force applicator 13 of the first axial force transmission route applies axial force, the distance between the force transmission member 121 of the second axial force transmission route and the purlin 3 increases, and the adjusting member 122 automatically slides down along the inner side of the purlin 3 and the groove 1211 under the action of its own gravity, and under the action of the locking device 123, the force transmission member 121 and the purlin 3 are automatically wedged, so as to reliably transmit the second axial force;

[0116] When the formwork is supported on the concrete purlin, the adjusting member 122 is temporarily fixed on the force transmission member 121, and then against the inner formwork 31 of the concrete purlin, serving as a support for the formwork system. It not only has the formwork supporting function, but also can ensure that after the inner formwork 31 of the concrete purlin is removed, the adjusting member 122 is fully consistent with the inner surface of the purlin 3, and the force transmission effect is better.

[0117] Preferably, the adjusting member 122 is fixed to the force transmitting member 121 by binding or spot welding.

[0118] Preferably, if the inner formwork 31 of the concrete purlin is made of a steel plate provided with anchor bars and locking support space, and is cast together with the purlin concrete, it can not only replace the formwork without being removed, but the steel plate also serves as an embedded part of the concrete purlin, so that the force transmission member 121 is against the steel plate purlin (after the strength requirements are met after the concrete is poured), and the axial force can be directly converted and locked in one go; the anchor bars are buried in the interior of the purlin concrete, providing the steel plate with downward anti-slip force and local anti-pressure, and the locking support space refers to the local protrusion of the steel plate, and the concrete space for the locking support is reserved.

[0119] Preferably, the force transmission member 22, the base plate 1212, the connecting ribs 1213 and the temporary connecting rod 1214 of the axial force adjustment lock 12 are integrated into one, similar to a square cylinder or a cylinder, and the upper side opening of the square cylinder or the cylinder is used to take and place the axial force application device 131.

[0120] Preferably, the positions of the force transmission member 22, the base plate 1212, and the connecting ribs 1213 of the axial force adjustment lock 12 all coincide with the cross-sectional range of the diagonal support rod body 2 at the lower end of the axial force conversion base 11, so that the bending, shearing, and punching resistance of the axial force conversion base 11 are significantly improved while saving materials.

[0121] Preferably, the locker 123 includes a locking support and a locking gasket 1231; the locking support is an anti-slip body arranged on the inner side of the purlin 3, the first end of which is connected to the purlin 3, and the second end is exposed outside the purlin 3 and is located above the adjustment member 122; the connection method between the locking support and the purlin 3 includes welding, insertion or casting; the locking support is a long strip member with a rectangular, groove-shaped, I-shaped or plate-shaped cross-section, and the material is steel, concrete or a steel-concrete composite material.

[0122] The locking gasket 1231 is set to be a sheet of steel plates or steel-concrete composite components with different thicknesses. At least one locking gasket 1231 overlapped up and down is placed flat in the gap between the adjusting member 122 and the locking support, which is used to adjust the gap between the adjusting member 122 and the locking support, thereby adjusting the distance between the force transmission member 121 and the surrounding purlin 3; the locking support and the locking gasket 1231 together prevent the adjusting member 122 from sliding upward along the inner side of the surrounding purlin 3, ensuring that the axial force adjustment lock 12 reliably supports the surrounding purlin 3, thereby ensuring the reliability of the front diagonal brace and the safety of the foundation pit; through the use of the locking support and the locking gasket 1231, only the single-section adjusting member 122 can be used to prevent the upward sliding component of the upper end of the front diagonal brace; the adjusting member 122, the locking gasket 1231 and the locking support are used together to simultaneously complete the triple functions of axial force adjustment of the front diagonal brace, 45-degree conversion of the axial force and preventing the adjusting member 122 from sliding upward.

[0123] When the construction of the purlin 3 is completed, the locking support is installed first (this step is not required for the cast-in locking support), and then the wedge-shaped adjusting member 122 is placed in the groove 1211 of the force transmission member 121 and against the inner side of the purlin 3. When the axial force applicator 13 of the first axial force transmission route applies axial pressure to the front diagonal brace, the distance between the force transmission member 121 of the axial force adjustment locker 12 of the first axial force transmission route, the axial force conversion base 11 and the diagonal brace rod body 2 as a whole and the purlin 3 is increased, and the adjusting member 122 of the axial force adjustment locker 12 slides downward along the inner side of the purlin and the bottom of the groove 1211 of the force transmission member 121 under the action of its own weight, wedging the gap, and then inserting the locking gasket 1231 between the adjusting member 122 and the locking support to ensure that the upward sliding force of the adjusting member 122 is transmitted to the locking support through the locking gasket 1231, wherein the thickness and number of the locking gasket 1231 are selected according to the size of the gap.

[0124] Preferably, the locking support and the locking gasket 1231 are arranged at the top of the inner side of the crown beam. When the axial force is applied and converted, the operator can directly stand on the top of the purlin to operate the axial force application device 131 and insert the locking gasket 1231. Compared with other methods, the operation is convenient, safe and easy to implement. Furthermore, a gasket placement groove 1234 with a bottom of an arc or inclined surface 1235 inclined toward the locking support is pre-set on the side of the locking support close to the foundation pit. The locking gasket 1231 can be placed in the gasket placement groove 1234 in advance. When the adjustment member 122 slides down and the gap between the adjustment member or the original locking gasket and the locking support is greater than the thickness of a single locking gasket 1231, the locking gasket 1231 can automatically slide into the gap below the locking support by its own weight, and automatically complete the increase of the locking gasket 1231, making the axial force servo more automated.

[0125] The connection modes of the locking support and the purlin 3 include welding, insertion or casting; the first mode: when the purlin 3 is a steel purlin or a concrete purlin with embedded parts, the first end of the locking support is directly welded to the embedded parts of the steel purlin or the concrete purlin; the second mode: a reserved space is reserved inside the concrete purlin for the later insertion of the locking support. After the concrete purlin is demolded, the locking support is inserted into the reserved space. This is an assembled locking support 1233, which is convenient for the construction and installation of the concrete purlin 3 and can be reused, saving materials, reducing costs and increasing the construction and installation speed. The assembled locking support 1233 is strip-shaped; the third mode: a concrete protrusion protruding from the inner side of the purlin 3 is provided on the inner side of the concrete purlin 3. The protrusion is cast into a whole with the concrete purlin 3, which is called a cast-in locking support 1232; please refer to the side view of the axial force adjustment lock of the assembled locking support Figure 4 For a side view of the axial force adjustment lock of the cast-in locking support, see Figure 5 .

[0126] Preferably, if the inner formwork 31 of the concrete purlin is made of a steel plate formwork provided with anchor bars and locking support spaces, and is cast together with the purlin concrete, not only can the inner formwork be replaced without being removed, but the steel plate also serves as an embedded part of the concrete purlin, so that after the force transmission member 121 is against the steel plate, the axial force can be directly converted and locked in one go; the anchor bars are buried inside the purlin concrete, providing the steel plate with downward anti-slip force and local anti-pressure.

[0127] Furthermore, the axial force conversion mechanism of the first axial force transmission route and the second axial force transmission route is as follows: when the axial force applicator 13 applies prestress to the front diagonal brace, a first axial force transmission route is formed, and the axial force adjustment locker 12 replaces the axial force of the first axial force transmission route, and provides a second axial force transmission route after the axial force of the first axial force transmission route is removed or fails, and provides an axial force locking function to ensure the safety and reliability of the front diagonal brace; or the axial force of the first axial force transmission route is not removed, and a double insurance system is formed with the axial force of the second axial force transmission route.

[0128] The technical effect of this embodiment is that the axial force adjustment locker can not only transmit the force of the front diagonal brace directly to the purlin through the steel plate formwork to complete the functions of axial force conversion and locking, but also in the stage of supporting the formwork of the concrete purlin, the force transmission part and the adjustment part can provide the function of the formwork support, so that the adjustment part can fully match the inner side of the purlin after the formwork is removed and be highly self-consistent.

[0129] Example 3

[0130] On the basis of Examples 1 and 2, this example introduces the processes of axial bearing capacity detection, prestressing, and axial force servo, which are respectively: when only the axial bearing capacity detection of the front diagonal brace is performed, the axial force applicator 13 applies axial detection pressure to the front diagonal brace, and after the bearing capacity detection of the front diagonal brace is completed, the axial force applying device 131 and the first axial force transmission route are completely removed, and the axial force adjustment locker 12 is locked to form a second axial force transmission route; when the axial force applicator 13 applies axial detection pressure to the front diagonal brace, after the axial bearing capacity test of the front diagonal brace is completed, the axial force applicator 13 controls the load at a fixed value and removes part of the axial force, and the remaining axial force is the prestress, and then the axial force is locked. The locker 12 is adjusted to form a second axial force transmission route, after which the axial force application device 131 and the first axial force transmission route are completely removed to complete the application of prestress; according to the horizontal deformation of the foundation pit purlin 3 into the foundation pit, the axial force application device 131 and the first axial force transmission route are retained; or the axial force application device 131 and the first axial force transmission route are removed, and the axial force application device 131 is installed again to form the first axial force transmission route, increase the axial force of the axial force application device 131, reduce the horizontal deformation of the purlin 3, and then add the locking gasket 1231 to re-lock the axial force adjustment locker 12, and repeat this process to complete the axial force and deformation adjustment of the front diagonal brace, that is, implement axial force servo.

[0131] Example 4

[0132] On the basis of Examples 1 and 2, this example introduces a construction method of a front diagonal brace containing an axial force converter, which is applied to a front diagonal brace containing an axial force converter described in Example 1 or 2, and is characterized in that the construction method comprises the following steps:

[0133] S1, construction diagonal brace rod body 2;

[0134] S2, construct concrete purlin 3 (replace the inner formwork of the purlin with a steel plate when necessary), and complete the embedding of embedded parts and the setting of locking supports;

[0135] S3, respectively install the length adjuster 112, the axial force conversion base 11 and the force transmission member 121 of the axial force adjustment locker 12 on the upper end of the diagonal brace body 2, and place the adjusting member 122 into the groove 1211 of the force transmission member 121 and against the surrounding purlin 3;

[0136] S4, install the force bearing device 132 of the axial force applicator 13, insert the axial force applying device 131 between the axial force adjustment locker 12 and the axial force conversion base 11, adjust the axial force applying device 131 to support the force bearing device 132 and the axial force conversion base 11, and form a first axial force transmission route;

[0137] S5, the axial force applying device 131 starts to further increase the axial force, detects the bearing capacity of the diagonal brace according to the bearing capacity detection requirements of the diagonal brace, and then controls the load, places the locking gasket 1231 between the top surface of the adjustment member 122 and the bottom surface of the locking support, and forms a second axial force transmission route after locking is completed;

[0138] Alternatively, the axial force applying device 131 starts to further increase the axial force, detects the bearing capacity of the diagonal brace according to the bearing capacity detection requirements of the diagonal brace, and then controls the load to reach a predetermined axial force value, places a locking gasket 1231 between the top surface of the adjustment member 122 and the bottom surface of the locking support, and forms a second axial force transmission route after locking is completed, that is, applying prestress; according to the deformation of the purlin 3 monitored by the foundation pit, repeat the above-mentioned axial force application, adjustment and locking steps for multiple times to implement the axial force servo process.

[0139] S6. When the concrete strength of the basement foundation slab or the middle floor slab reaches the requirement, start to remove the diagonal brace, load the axial force application device 131, and the locking gasket 1231 of the axial force adjustment lock 12 becomes loose. Remove the locking gasket 1231 and the adjusting member 122 respectively, and then remove the force transmission member 121 and the axial force conversion base 11, and finally remove the diagonal brace rod body 2; or, when the concrete strength of the foundation slab or the middle floor slab reaches the requirement, cut off and lift the diagonal brace rod body 2 at the elevation position of the top surface of the foundation slab, and the axial force adjustment lock 12 will automatically fall off.

[0140] Another construction method of a front diagonal brace containing an axial force converter is characterized by comprising the following steps:

[0141] S1, construction diagonal brace rod body 2;

[0142] S2, install the axial force conversion base 11 and the force transmission member 121 of the axial force converter 1, fix the adjustment member 122 on the force transmission member 121 and against the inner template of the purlin, complete the purlin formwork and pour the concrete of the purlin 3, and complete the embedding of the embedded parts and the setting of the locking support;

[0143] S3, after removing the inner template of the purlin, place the adjusting member 122 into the groove 1211 of the force transmission member 121 and press against the purlin 3;

[0144] S4, install the force bearing device 132 of the axial force applicator 13, insert the axial force applying device 131 between the axial force adjustment locker 12 and the axial force conversion base 11, adjust the axial force applying device 131 to support the force bearing device 132 and the axial force conversion base 11, and form a first axial force transmission route;

[0145] S5, the axial force applying device 131 starts to further increase the axial force, detects the bearing capacity of the diagonal brace according to the bearing capacity detection requirements of the diagonal brace, and then controls the load, places the locking gasket 1231 between the top surface of the adjustment member 122 and the bottom surface of the locking support, and forms a second axial force transmission route after locking is completed;

[0146] Alternatively, the axial force applying device 131 starts to further increase the axial force, detects the bearing capacity of the diagonal brace according to the bearing capacity detection requirements of the diagonal brace, and then controls the load to reach a predetermined axial force value, places a locking gasket 1231 between the top surface of the adjustment member 122 and the bottom surface of the locking support, and forms a second axial force transmission route after locking is completed, that is, applying prestress; according to the deformation of the purlin 3 monitored by the foundation pit, repeat the above-mentioned axial force application, adjustment and locking steps for multiple times to implement the axial force servo process.

[0147] S6. When the concrete strength of the basement foundation slab or the middle floor slab reaches the requirement, start to remove the diagonal brace, load the axial force application device 131, and the locking gasket 1231 of the axial force adjustment lock 12 becomes loose. Remove the locking gasket 1231 and the adjusting member 122 respectively, and then remove the force transmission member 121 and the axial force conversion base 11, and finally remove the diagonal brace rod body 2; or, when the concrete strength of the foundation slab or the middle floor slab reaches the requirement, cut off and lift the diagonal brace rod body 2 at the elevation position of the top surface of the foundation slab, and the axial force adjustment lock 12 will automatically fall off.

[0148] The above description is only the preferred embodiment of the present invention, which does not limit the protection scope of the present invention. For those skilled in the art, the present invention can be modified and varied in various ways. Within the spirit and principle of the present invention, any change, modification, replacement, integration and parameter change of these embodiments by conventional substitution or capable of achieving the same function without departing from the principle and spirit of the present invention shall fall within the protection scope of the present invention.

Claims

1. A front diagonal brace with an axial force converter, characterized in that: The front diagonal brace is an oblique support arranged inside the foundation pit, comprising an axial force converter (1) and a diagonal brace rod body (2); the upper end of the diagonal brace rod body (2) is connected to the axial force converter (1), and the lower end is arranged in the soil below the bottom of the pit; the axial force converter (1) is arranged between the upper end of the diagonal brace rod body (2) and the surrounding purlin (3); The axial force converter (1) comprises an axial force conversion base (11), an axial force adjustment locker (12) and an axial force applicator (13); the axial force conversion base (11) is arranged at the bottom of the axial force converter (1), and the inner side of the axial force conversion base (11) is connected to the diagonal support rod body (2); the longitudinal axis of the axial force conversion base (11) is perpendicular to the longitudinal axis of the diagonal support rod body (2); The axial force adjustment lockers (12) are symmetrically arranged on both sides of the axial force converter (1); The axial force applicator (13) provides a first axial force transmission route, and the axial force adjustment locker (12) provides a second axial force transmission route; the first axial force transmission route is arranged in the middle of the axial force conversion base (11); and the second axial force transmission route is arranged on both sides of the first axial force transmission route.

2. A front diagonal brace with an axial force converter according to claim 1, characterized in that: The axial force conversion base (11) is in the shape of a strip, and its two outer ends are connected to the axial force adjustment locker (12), and the middle part of the outer side of the axial force conversion base (11) is used to abut against the bottom end of the axial force applicator (13); A limited support (111) is provided in the middle of the inner side of the axial force conversion base (11), and the limited support (111) connects the axial force conversion base (11) and the diagonal support rod body (2), and the connection method is internal insertion type or external packaging type.

3. A front diagonal brace with an axial force converter according to claim 1, characterized in that: A length adjuster (112) is arranged between the axial force conversion base (11) and the diagonal brace rod body (2); the length adjuster (112) is composed of at least one adjustment section, the first end of each adjustment section is a tube body (1121) of the adjustment section, and the second end is an insert body (1122) of the adjustment section, the outer contour size of the insert body (1122) of the adjustment section is smaller than the inner contour size of the tube body (1121) of the adjustment section, and a plurality of adjustment sections are connected end to end, and the insert body (1122) of the adjustment section is inserted into the tube body (1121) of an adjacent adjustment section, thereby completing the adjustment of the length of the diagonal brace rod body (2).

4. A front diagonal brace with an axial force converter according to claim 1, characterized in that: The axial force adjustment locker (12) comprises a force transmission member (121), an adjustment member (122) and a locker (123); The force transmission member (121) is a strip-shaped member, which is arranged in pairs on both sides of the axial force converter (1); the upper end of the force transmission member (121) is against the surrounding purlin (3) through the adjustment member (122), and the lower end is connected to the axial force conversion base (11); the force transmission member (121) is a solid type or a lattice type; The force transmission member (121) is provided with a groove (1211) at the upper end, and a reinforcing wing plate (1215) is provided at the outer upper edge; A bottom plate (1212) is arranged between the force transmission members (121); the bottom plate (1212) is perpendicular to the vertical plane of the force transmission members (121), and the bottom plate (1212) is connected to the axial force conversion base (11); the bottom plate (1212) is used to place the axial force application device (131).

5. A front diagonal brace with an axial force converter according to claim 4, characterized in that: The adjusting member (122) is configured as a wedge-shaped body (1221) that is larger at the top and smaller at the bottom; The first end of the adjusting member (122) abuts against the inner side surface of the surrounding purlin (3), and the second end is placed in the groove (1211) at the upper end of the force transmission member (121) and abuts against the bottom of the groove (1211).

6. A front diagonal brace with an axial force converter according to claim 4, characterized in that: The locker (123) comprises a locking support and a locking gasket (1231); the locking support is an anti-slip body arranged on the inner side of the purlin (3), a first end of which is connected to the purlin (3), and a second end of which is exposed outside the purlin (3) and is located above the adjusting member (122); the locking support and the purlin (3) are connected in any one of a welding type, an insertion type and a casting type; The locking gasket (1231) is configured as a sheet-shaped steel plate or a steel-concrete composite member of different thicknesses, and at least one locking gasket (1231) stacked up and down is placed flat in the gap between the adjusting member (122) and the locking support.

7. The front diagonal brace with an axial force converter according to claim 1, characterized in that: The axial force applicator (13) comprises an axial force applying device (131) and a force bearing device (132); the lower end of the axial force applying device (131) abuts against the axial force conversion base (11), and the upper end abuts against the force bearing device (132); The upper end of the load-bearing device (132) is connected to the surrounding purlin (3), and the lower end is located in the space between the axial force adjustment lockers (12) on both sides, and abuts against the top of the axial force application device (131) along the longitudinal axis direction of the diagonal support rod body (2); the lower end of the load-bearing device (132) is provided with an end plate (1321) perpendicular to the longitudinal axis of the load-bearing device (132); the end plate (1321) bears and evenly disperses the pressure of the axial force application device (131), and abuts against the axial force adjustment lockers (12) on both sides in a horizontal direction perpendicular to the longitudinal axis direction of the diagonal support rod body (2), thereby limiting the movement and rotation of the axial force adjustment lockers (12) along the direction perpendicular to the longitudinal axis direction of the diagonal support rod body (2); The connection method of the load-bearing device (132) and the concrete purlin (3) is any one of a pre-connection method and a post-connection method; The load-bearing device (132) comprises a transverse rib plate (1322) and a vertical rib plate (1323), and the transverse rib plate (1322) is tightly pressed against the axial force adjustment lockers (12) on both sides; The stress bearer (132) is configured as an integral type or a split assembly type; the integral type means that the stress bearer (132) is a whole; the split assembly type includes a stress bearer (132) having an inclined plate type upper connecting member (133) and a stress bearer (132) having a bolt type upper connecting member (134).

8. The front diagonal brace with an axial force converter according to claim 1, characterized in that: The process of axial bearing capacity detection, prestressing and axial force servo is as follows: when only the axial bearing capacity detection of the front diagonal brace is performed, the axial force applicator (13) applies axial detection pressure to the front diagonal brace. After the bearing capacity detection of the front diagonal brace is completed, the axial force application device (131) and the first axial force transmission route are completely removed, and the axial force adjustment locker (12) is locked to form a second axial force transmission route; when the axial force applicator (13) applies axial detection pressure to the front diagonal brace, after the axial bearing capacity test of the front diagonal brace is completed, the axial force applicator (13) controls the load at a fixed value and removes part of the axial force, and the remaining axial force is the prestress, and then the axial force adjustment locker (12) is locked to form the second axial force. The axial force application device (131) and the first axial force transmission route are then completely removed to complete the application of prestress; according to the horizontal deformation of the foundation pit purlin (3) into the foundation pit, the axial force application device (131) and the first axial force transmission route are retained; or the axial force application device (131) and the first axial force transmission route are removed, and the axial force application device (131) is installed again to form the first axial force transmission route, the axial force of the axial force application device (131) is increased, the horizontal deformation of the purlin (3) is reduced, and then the locking gasket (1231) is added, and the axial force adjustment locker (12) is re-locked, and the axial force and deformation adjustment of the front diagonal brace are repeatedly completed in this way, that is, the axial force servo is implemented.

9. A construction method for a front diagonal brace containing an axial force converter according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1, construct the diagonal brace rod body (2); S2, constructing the concrete purlin (3), and completing the embedding of the embedded parts and the setting of the locking supports, and replacing the inner formwork of the purlin with a steel plate when necessary; S3, successively installing the length adjuster (112), the axial force conversion base (11) and the force transmission member (121) of the axial force adjustment locker (12) on the upper end of the diagonal support rod body (2), and placing the adjustment member (122) into the groove (1211) of the force transmission member (121) and against the surrounding purlin (3); S4, installing the load-bearing device (132) of the axial force applicator (13), inserting the axial force applying device (131) between the axial force adjustment locker (12) and the axial force conversion base (11), and adjusting the axial force applying device (131) to support the load-bearing device (132) and the axial force conversion base (11), so as to form a first axial force transmission route; S5, the axial force applying device (131) starts to further increase the axial force, detects the bearing capacity of the diagonal brace according to the bearing capacity detection requirements of the diagonal brace, and then controls the load, places a locking gasket (1231) between the top surface of the adjustment member (122) and the bottom surface of the locking support, and forms a second axial force transmission route after locking is completed; Alternatively, the axial force applying device (131) starts to further increase the axial force, detects the bearing capacity of the diagonal brace according to the bearing capacity detection requirements of the diagonal brace, and then controls the load to reach a predetermined axial force value, places a locking gasket (1231) between the top surface of the adjustment member (122) and the bottom surface of the locking support, and forms a second axial force transmission route after locking is completed, that is, applying prestress; according to the deformation of the surrounding purlin (3) monitored by the foundation pit, the above-mentioned axial force application, adjustment and locking steps are repeated multiple times to implement the axial force servo process; S6. When the concrete strength of the basement foundation slab or the middle floor slab reaches the required level, the diagonal brace is removed, the axial force applying device (131) is loaded, the locking gasket (1231) of the axial force adjustment lock (12) is loosened, the locking gasket (1231) and the adjusting member (122) are removed respectively, and then the force transmission member (121) and the axial force conversion base (11) are removed, and finally the diagonal brace rod body (2) is removed; or, when the concrete strength of the base slab or the middle floor slab reaches the required level, the diagonal brace rod body (2) is cut off and hoisted at the elevation position of the top surface of the base slab, and the axial force adjustment lock (12) automatically falls off.

10. Another construction method of a front diagonal brace containing an axial force converter according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1, construct the diagonal brace rod body (2); S2, installing the axial force conversion base (11) and the force transmission member (121) of the axial force converter (1), fixing the adjustment member (122) on the force transmission member (121) and against the inner template of the purlin, completing the purlin formwork and pouring the concrete of the purlin (3), and completing the embedding of the embedded parts and the setting of the locking support; S3, after removing the inner template of the purlin, the adjusting member (122) is placed in the groove (1211) of the force transmission member (121) and pressed against the purlin (3); S4, installing the load-bearing device (132) of the axial force applicator (13), inserting the axial force applying device (131) between the axial force adjustment locker (12) and the axial force conversion base (11), and adjusting the axial force applying device (131) to support the load-bearing device (132) and the axial force conversion base (11), so as to form a first axial force transmission route; S5, the axial force applying device (131) starts to further increase the axial force, detects the bearing capacity of the diagonal brace according to the bearing capacity detection requirements of the diagonal brace, and then controls the load, places a locking gasket (1231) between the top surface of the adjustment member (122) and the bottom surface of the locking support, and forms a second axial force transmission route after locking is completed; Alternatively, the axial force applying device (131) starts to further increase the axial force, detects the bearing capacity of the diagonal brace according to the bearing capacity detection requirements of the diagonal brace, and then controls the load to reach a predetermined axial force value, places a locking gasket (1231) between the top surface of the adjustment member (122) and the bottom surface of the locking support, and forms a second axial force transmission route after locking is completed, that is, applying prestress; according to the deformation of the surrounding purlin (3) monitored by the foundation pit, the above-mentioned axial force application, adjustment and locking steps are repeated multiple times to implement the axial force servo process; S6. When the concrete strength of the basement foundation slab or the middle floor slab reaches the required level, the diagonal brace is removed, the axial force applying device (131) is loaded, the locking gasket (1231) of the axial force adjustment lock (12) is loosened, the locking gasket (1231) and the adjusting member (122) are removed respectively, and then the force transmission member (121) and the axial force conversion base (11) are removed, and finally the diagonal brace rod body (2) is removed; or, when the concrete strength of the base slab or the middle floor slab reaches the required level, the diagonal brace rod body (2) is cut off and hoisted at the elevation position of the top surface of the base slab, and the axial force adjustment lock (12) automatically falls off.

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