Detachable combined type inclined front support structure and construction method

Abstract

The invention provides a detachable combined type inclined front support structure and a construction method. The detachable combined type inclined front support structure comprises an upper-section inclined front support, a lower-section inclined front support and a connecting section. The lower-section inclined front support is obliquely inserted below a bottom plate of a main body structure, the upper-section inclined front support is obliquely supported between the bottom plate of the main body structure and a coping beam of an enclosure structure, and the lower end of the lower-section inclined front support is coaxially and detachably connected with the upper-section inclined front support through a connecting section to form the detachable combined inclined front support. The invention relates to the technical field of civil engineering, and can solve the problems that in the prior art, an inclined front support is inconvenient to disassemble, low in efficiency, difficult to reuse and insufficient in bearing capacity.

Description

Technical Field

[0001] This invention relates to the field of civil engineering technology, and in particular to a detachable and modular inclined front bracing structure and its construction method. Background Technology

[0002] The foundation pit inclined front brace is a type of inclined support installed inside the foundation pit. As a new type of support structure, it has been used in many projects in recent years. It usually involves driving steel pipes obliquely into the foundation pit and using the axial bearing capacity of the steel pipes to resist the water and soil pressure outside the pit. After the main structure's bottom slab is cured, the inclined front brace above the bottom slab is cut off.

[0003] The inclined front bracing is a crucial structure for foundation pit support. However, current inclined front bracing systems used in foundation pit engineering generally suffer from two major technical defects: non-removability and insufficient load-bearing capacity. Traditional inclined front bracing often employs integral welded or integrated steel pipe structures, requiring manual cutting and dismantling after the main structure's foundation slab is poured. This results in low construction efficiency and generates a large amount of non-reusable metal waste, significantly increasing project costs. Furthermore, pure steel pipe inclined front bracing has limited load-bearing capacity. When the foundation pit is deep or the soil pressure is high, insufficient load-bearing capacity often necessitates the use of large-diameter steel pipes, leading to material waste and difficulties in transportation and installation. Therefore, there is a need for a detachable and modular inclined front bracing structure and construction method that can solve the problems of inconvenient and inefficient dismantling, lack of reusability, and insufficient load-bearing capacity in existing technologies. Summary of the Invention

[0004] The purpose of this invention is to provide a detachable and modular inclined front brace structure and construction method, which can solve the problems of inconvenient and inefficient disassembly, difficulty in reuse, and insufficient load-bearing capacity of the inclined front brace in the prior art.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows:

[0006] A detachable and modular inclined front support structure includes: an upper inclined front support, a lower inclined front support, and a connecting section; the lower inclined front support is inserted obliquely below the bottom plate of the main structure, the upper inclined front support is obliquely supported between the bottom plate of the main structure and the capping beam of the enclosure structure, and the lower end of the lower inclined front support is detachably connected to the upper inclined front support coaxially through the connecting section to form a detachable and modular inclined front support.

[0007] One end of the capping beam is fixedly connected to the enclosure structure, and the other end of the capping beam extends obliquely downward to form a bent extension section. The upper end of the upper oblique front support is supported on the bent extension section of the capping beam by a prestressed automatic servo system. The upper oblique front support, the prestressed automatic servo system and the bent extension section of the capping beam are arranged coaxially.

[0008] The lower end of the upper inclined front support is provided with a base, and a ring-shaped sub-buckle is formed on the bottom surface of the base. The upper end of the lower inclined front support is provided with a top seat structure, and a ring-shaped female buckle is formed on the top surface of the top seat structure. The sub-buckle is inserted into the female buckle to make the base and the top seat structure detachably connected. The base and the top seat structure are connected and fixed by several circumferentially arranged connectors to form a coaxial detachable connection between the upper and lower inclined front supports.

[0009] The top seat structure includes a first top seat, a second top seat, an outer side wall of the top seat, and an inner side wall of the top seat. The outer side wall and the inner side wall of the top seat form a ring structure and are connected between the first top seat and the second top seat to form a hollow top seat structure. The second top seat is fixedly installed at the upper end of the lower inclined front support. The top surface of the first top seat is attached to the bottom surface of the base and connected by several connectors. Several observation holes are formed at intervals on the outer side wall of the top seat, and the observation holes are respectively located on the outer side of the several connectors. The female buckle is recessed inward and formed on the top of the inner side wall of the top seat.

[0010] The upper inclined front support is a smooth steel pipe. The diameter of the upper inclined front support is smaller than the diameter of the base. Several stiffening ribs are provided between the base and the upper inclined front support. The stiffening ribs and several connecting pieces are arranged alternately.

[0011] The base, the first top seat, the second top seat, and the lower inclined front support have the same diameter, while the diameter of the upper inclined front support is smaller than that of the lower inclined front support. The lower inclined front support is a steel pipe with raised texture on its outer wall, and concrete is poured into the lower inclined front support. The lower end of the lower inclined front support is a conical pointed pile head. A water-stop steel plate is provided at the junction of the lower inclined front support and the base plate.

[0012] When the connecting section is a pre-filled rigid overflow connecting section, a cross-shaped limiting plate is provided on the bottom surface of the base. The cross-shaped limiting plate is located inside the buckle and inserted into the hollow part of the top seat structure. The side wall of the cross-shaped limiting plate and the inner wall of the inner side wall of the top seat are interlocked with concave and convex shear grooves, so that when the cross-shaped limiting plate is inserted into the inner side wall of the top seat, the shear groove on the cross-shaped limiting plate and the shear groove on the inner side wall of the top seat are engaged and connected. The second base is provided with an overflow vent with a flip-top ring structure, and the flip-top is provided with a handle.

[0013] When the connecting section is an in-situ injection unidirectional closed connecting section, a conical valve bayonet is formed in the middle of the base. The conical valve bayonet is a conical structure with a small opening at the top and a large opening at the bottom. A limiting groove is fixed in the inner side wall of the top seat by several positioning rods. A conical valve is installed in the limiting groove. A pull rod is connected to the cone top of the conical valve. The pull rod extends upward through the conical valve bayonet and then to the top of the upper inclined front support, so that the conical valve can be raised and lowered by the pull rod and can be closed and locked in the conical valve bayonet. A pressure sensing plate is attached to the surface of the conical valve. A synchronous sensing display is installed on the pull rod and is connected to the pressure sensing plate.

[0014] A construction method for a detachable and modular inclined front bracing structure includes the following steps:

[0015] Step 1: Fabricate the upper diagonal front brace, lower diagonal front brace, and connecting section according to the support load requirements;

[0016] Step 2: Transport the upper section of the inclined front brace, the lower section of the inclined front brace, and the connecting section to the construction site, and drive the lower section of the inclined front brace into the soil at the designed angle.

[0017] Step 3: Connect the lower end of the upper section of the diagonal front support to the upper end of the lower section of the diagonal front support through the connecting section to form a detachable and combinable diagonal front support;

[0018] Step 4: Install the prestressed automatic servo system on the upper end of the upper inclined front brace and support it on the bent extension section of the capping beam;

[0019] Step 5: Construct the base plate of the main structure, and after the base plate is cured, separate the upper and lower inclined front supports by disassembling the connecting section to achieve rapid disassembly of the upper inclined front support.

[0020] When the connecting section adopts a pre-filled rigid overflow connecting section, in step 1, the lower section of the inclined front support is pre-filled with concrete on the ground using the inclined pouring method in the factory, and the flip cover is turned over and opened to observe the pre-filling of concrete through the observation hole and overflow vent.

[0021] When the connecting section adopts an in-situ cast-in-place unidirectional closed connecting section, in step 1, the lower inclined front support is not filled with concrete; in step 2, after the lower inclined front support is installed in place, concrete is poured into the lower inclined front support, and the pouring method is as follows:

[0022] Insert the concrete guide pipe into the lower inclined front support through the cone valve bayonet. Pour self-flowing concrete into the lower inclined front support through the concrete guide pipe. When the self-flowing concrete is poured into the overflow limiting groove, the pressure sensor on the surface of the cone valve senses the pressure of the self-flowing concrete and displays the pressure through the synchronous sensing display instrument. Pull out the concrete guide pipe and pull up the pull rod to make the cone valve synchronously rise into the cone valve bayonet on the base and close the cone valve bayonet.

[0023] The method of connecting the lower end of the upper inclined front support and the upper end of the lower inclined front support by means of connecting the connecting section is as follows: insert the male buckle at the bottom of the base of the upper inclined front support into the female buckle on the first top seat of the lower inclined front support, and connect and fix the base and the first top seat by means of several connecting pieces.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. This invention achieves segmented functionality of lower load-bearing and upper support by combining upper and lower inclined front supports. The lower inclined front support has high compressive strength (bearing capacity is increased by 40-60% compared to pure steel pipes in the prior art), which can reduce the support cross-sectional size by more than 30%. The joint nodes of the connecting section are reliable in terms of stress and have multiple functions, which can quickly realize the non-destructive disassembly and reuse of the upper inclined front support above the base plate. Among them, the "pre-cast rigid overflow connection section" can realize the factory pre-pouring of the lower inclined front support, and the "in-situ cast one-way closed connection section" can realize the in-situ pouring of the lower inclined front support, ensuring the quality of concrete pouring. This solves the problems of inconvenient reuse of inclined front supports, low dismantling efficiency and insufficient bearing capacity in the prior art.

[0026] 2. The structure of the present invention has the advantages of high load-bearing capacity, modular disassembly and reliable nodes. The industrialized construction method of the present invention can effectively improve the stress performance of the disassembly and combination inclined front brace, shorten the construction period and save costs. It has the advantages of safety, reliability, high construction efficiency and green low carbon, and is especially suitable for foundation pit engineering support structures. Attached Figure Description

[0027] The above and other objects, features and advantages of this disclosure will become more apparent from the accompanying drawings, in which like reference numerals generally denote like parts.

[0028] Figure 1 This is a construction cross-sectional view of a detachable and combinable inclined front support structure according to the present invention;

[0029] Figure 2 This is a partially enlarged view of a detachable and modular inclined front support structure of the present invention (pre-filled rigid overflow grout connection section);

[0030] Figure 3 yes Figure 2 Sectional view of AA in the middle;

[0031] Figure 4 yes Figure 2 Cross-sectional view of the middle section (BB);

[0032] Figure 5 yes Figure 2 CC section view;

[0033] Figure 6 yes Figure 2 Cross-sectional view of DD in the middle;

[0034] Figure 7 This is a schematic diagram of the inclined pouring method for the lower section of the inclined front support in a detachable and modular inclined front support structure according to the present invention.

[0035] Figure 8This is a partially enlarged view of a detachable and modular inclined front support structure of the present invention (in-situ injection of unidirectional closed connection section);

[0036] Figure 9 yes Figure 8 EE cross-section;

[0037] Figure 10 yes Figure 8 Cross-sectional view of FF in the middle;

[0038] Figure 11 This is a construction flowchart of a detachable and modular inclined front support structure of the present invention (in-situ grouting of a one-way closed connection section).

[0039] In the diagram, 1 is the upper inclined front support, 11 is the base, 12 is the stiffening rib, 13 is the buckle, 14 is the cross limiting plate, 15 is the shear groove, 16 is the cone valve bayonet, 17 is the connector, 2 is the lower inclined front support, 21 is the first top seat, 22 is the second top seat, 23 is the outer wall of the top seat, 24 is the inner wall of the top seat, 25 is the female buckle, 26 is the observation hole, 27 is the overflow vent, 28 is the flip cover, 29 is the limiting groove, 210 is the cone valve, 211 is the positioning rod, 212 is the tie rod, 3 is the connecting section, 4 is the base plate, 5 is the prestressed automatic servo system, 6 is the top beam, 7 is the water-stop steel plate, 8 is the first limiting block, 9 is the second limiting block, and 10 is the concrete guide pipe. Detailed Implementation

[0040] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a further detailed explanation of the detachable and modular inclined front support structure and construction method proposed in this invention. The advantages and features of this invention will become clearer from the following description and claims. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of this invention.

[0041] Please see the appendix Figure 1 A detachable and modular inclined front support structure includes an upper inclined front support 1, a lower inclined front support 2, and a connecting section 3. The lower inclined front support 2 is inserted obliquely below the bottom plate 4 of the main structure, and the upper inclined front support 1 is obliquely supported between the bottom plate 4 of the main structure and the capping beam 6 of the enclosure structure. The lower end of the lower inclined front support 2 is detachably connected to the upper inclined front support 1 coaxially through the connecting section 3 to form a detachable and modular inclined front support.

[0042] The upper inclined front support 1 and the lower inclined front support 2 are detachably connected by connecting section 3, allowing the upper inclined front support 1 to be quickly installed and disassembled without damage, solving the problem of difficult disassembly of the inclined front support in the prior art. Compared with the welding installation of the prior art, it can have higher installation efficiency while ensuring load-bearing capacity. Compared with the segmented disassembly of the prior art, the upper inclined front support 1 can be reused after disassembly, reducing material waste.

[0043] Please see the appendix Figure 1One end of the capping beam 6 is fixedly connected to the enclosure structure, and the other end of the capping beam 6 extends obliquely downward to form a bent extension section. The upper end of the upper inclined front support 1 is supported on the bent extension section of the capping beam 6 by the prestressed automatic servo system 5. The upper inclined front support 1, the prestressed automatic servo system 5 and the bent extension section of the capping beam 6 are arranged coaxially.

[0044] The other end of the capping beam 6 adopts a bent extension section, forming a reinforced concrete irregular structure. The bending angle of the bent extension section can be determined according to the arrangement angle of the upper inclined front brace 1. The capping beam 6 can be cast integrally with the retaining structure to ensure that the horizontal water and soil pressure outside the pit is effectively transferred to the detachable and modular inclined front brace. The capping beam 6 is cast using conventional construction techniques, which will not be described in detail here.

[0045] Please see the appendix Figure 2 and attached Figure 8 The lower end of the upper inclined front support 1 is provided with a base 11, and a ring-shaped sub-buckle 13 is formed on the bottom surface of the base 11. The upper end of the lower inclined front support 2 is provided with a top seat structure, and a ring-shaped female buckle 25 is formed on the top surface of the top seat structure. The sub-buckle 13 is matched and inserted into the female buckle 25, so that the base 11 and the top seat structure are detachably connected. The base 11 and the top seat structure are connected and fixed by a number of circumferentially arranged connectors 17, forming a coaxial detachable connection section 3 between the upper inclined front support 1 and the lower inclined front support 2.

[0046] Preferably, the cross-section of the male buckle 13 can adopt a spherical convex structure with a slightly larger head, and the concave shape of the female buckle 25 matches the convex shape of the male buckle 13, so that the male buckle 13 can be inserted into the female buckle 25, similar to a mortise and tenon structure or a mechanical snap-fit ​​structure, which ensures that the pressure is transmitted and will not come out.

[0047] The snap-fit ​​connection of the ring-shaped male buckle 13 and female buckle 25 and the reinforced connection of the connector 17 take into account both the detachability and load-bearing capacity between the upper inclined front support 1 and the lower inclined front support 2.

[0048] Please see the appendix Figure 2 and attached Figure 8 The top seat structure includes a first top seat 21, a second top seat 22, an outer side wall 23, and an inner side wall 24. The outer side wall 23 and the inner side wall 24 form an annular structure and are connected between the first top seat 21 and the second top seat 22 to form a hollow top seat structure. The second top seat 22 is fixedly installed at the upper end of the lower inclined front support 2. The top surface of the first top seat 21 is attached to the bottom surface of the base 11 and connected by several connectors 17. Several observation holes 26 are formed at intervals on the outer side wall 23 of the top seat, and the observation holes 26 are respectively located on the outside of the several connectors 17. The female buckle 25 is formed circumferentially inwardly at the top of the inner side wall 24 of the top seat.

[0049] Preferably, the upper inclined front support 1 and the lower inclined front support 2 can be made of steel pipes, and the specifications and dimensions of the steel pipes can be adapted to the actual load-bearing requirements. The base 11 can be made of steel of the same material as the upper inclined front support 1 and integrally welded to the upper inclined front support 1. The first top seat 21, the second top seat 22, the outer wall 23 of the top seat and the inner wall 24 of the top seat can be made of steel of the same material as the lower inclined front support 2 and integrally welded to the lower inclined front support 2. The outer wall 23 of the top seat is circumferentially located outside the inner wall 24 of the top seat, forming a hollow top seat structure.

[0050] Preferably, the connector 17 can be a high-strength bolt and nut assembly. Bolt holes are pre-drilled on the base 11 and the first top seat 21. The high-strength bolt and nut assembly passes through the bolt holes to connect the base 11 and the first top seat 21, ensuring the reliability of the connection between the base 11 and the first top seat 21 and the ease of assembly and disassembly. The number of connectors 17 matches the number of bolt holes, and the specific number can be adjusted according to actual connection requirements.

[0051] The observation hole 26 facilitates the observation of the concrete pouring inside the lower inclined front support 2, and also facilitates the disassembly and assembly of the connector 17.

[0052] Please see the appendix Figure 3 Appendix Figure 4 and attached Figure 9 The upper inclined front support 1 is a smooth steel pipe. The diameter of the upper inclined front support 1 is smaller than the diameter of the base 11. Several stiffening ribs 12 are provided between the base 11 and the upper inclined front support 1. The stiffening ribs 12 and several connecting pieces 17 are arranged alternately.

[0053] Preferably, the stiffening rib 12, the base 11 and the upper inclined front support 1 can be welded into a whole, and the number of stiffening ribs 12 can be adjusted according to the number of connectors 17; the stiffening ribs 12 improve the reliability of the connection node between the base 11 and the upper inclined front support 1.

[0054] Please see the appendix Figure 2 and attached Figure 8 The base 11, the first top seat 21, the second top seat 22 and the lower inclined front support 2 have the same diameter, and the diameter of the upper inclined front support 1 is smaller than the diameter of the lower inclined front support 2. The lower inclined front support 2 is a steel pipe with raised texture on its outer wall. The lower inclined front support 2 is filled with concrete, and the lower end of the lower inclined front support 2 is a conical pointed pile head. A water-stop steel plate 7 is provided at the junction of the lower inclined front support 2 and the base plate 4.

[0055] The raised texture increases the frictional resistance below the pit bottom, thereby increasing the load-bearing capacity of the detachable and modular inclined front brace. A tapered pointed pile head is installed at the lower end of the lower inclined front brace 2 to improve the smoothness of driving the entire detachable and modular inclined front brace into the soil. The installation of the water-stop steel plate 7 improves the waterproofing and seepage prevention performance at the point where the lower inclined front brace 2 penetrates the bottom plate 4.

[0056] The diameter of the connecting section 3 is the same as the diameter of the lower inclined front support 2, that is, the connecting section 3 does not protrude from the lower inclined front support 2. Compared with the traditional flange connection (the flange protrudes from the side wall of the steel pipe, causing the inclined front support to be obstructed when driven into the soil), it has the advantage of not increasing the frictional resistance when the detachable and combined inclined front support is driven into the soil.

[0057] After concrete is poured into the lower section of the inclined front support 2, a steel-concrete structure is formed, which has strong bearing capacity and can resist large water and soil pressure outside the pit.

[0058] The connecting section 3 includes a pre-filled rigid overflow connecting section and an in-situ grouting unidirectional closed connecting section, which can realize factory pre-filling and on-site in-situ grouting of the lower inclined front support 2. Different forms of connecting section 3 can be selected according to different grouting methods of the lower inclined front support 2. The pre-filled rigid overflow connecting section has the advantages of high rigidity and reliable stress.

[0059] Please see the appendix Figure 2 To be continued Figure 6 When the connecting section 3 is a pre-filled rigid overflow grout connecting section, a cross-shaped limiting plate 14 is provided on the bottom surface of the base 11. The cross-shaped limiting plate 14 is located inside the buckle 13 and inserted into the hollow part of the top seat structure. The side wall of the cross-shaped limiting plate 14 and the inner wall of the inner side wall 24 of the top seat are interlocked with shear grooves 15. When the cross-shaped limiting plate 14 is inserted into the inner side wall 24 of the top seat, the shear grooves 15 on the cross-shaped limiting plate 14 and the shear grooves 15 on the inner side wall 24 of the top seat are engaged and connected. The second base 22 is provided with an overflow vent 27 with a ring structure and a flip cover 28. The flip cover 28 is provided with a handle.

[0060] By inserting the cross-shaped limiting plate 14 into the hollow part of the top seat structure and connecting it through the interlocking of the shear groove 15, the rigidity and stability of the connection node can be increased.

[0061] Preferably, the overflow vent 27 can adopt a circular, oval, or elliptical structure, and can be arranged in a ring around the circumference of the second top seat 22. The handle can be a triangular flip handle, which can be flipped down to fit against the flip cover 28, and can be flipped up to facilitate manual lifting of the flip cover 28 for observation and detection of concrete overflow in the lower inclined front support 2.

[0062] Please see the appendix Figure 8 To be continued Figure 10When the connecting section 3 is an in-situ injection unidirectional closed connecting section, a conical valve bayonet 16 is formed in the middle of the base 11. The conical valve bayonet 16 is a conical structure with a small opening at the top and a large opening at the bottom. A limiting groove 29 is fixed in the inner side wall 24 of the top seat by a number of positioning rods 211. A conical valve 210 is provided in the limiting groove 29. A pull rod 212 is connected to the cone top of the conical valve 210. The pull rod 212 extends upward through the conical valve bayonet 16 and extends to the top of the upper inclined front support 1, so that the conical valve 210 can be raised and lowered by the pull rod 212 and can be closed and locked in the conical valve bayonet 16.

[0063] Preferably, the limiting groove 29 is a concave circle, similar in shape to a cup, and the inner diameter of the limiting groove 29 is slightly larger than the diameter of the cone bottom of the cone valve 210, so that the cone valve 210 can fall into the limiting groove 29. The top opening diameter of the cone valve bayonet 16 does not exceed the diameter of the cone bottom of the cone valve 210, so as to ensure that the cone valve 210 can be locked in the cone valve bayonet 16 for sealing the cone valve bayonet 16 and realizing the closure of the lower inclined front support 2.

[0064] The cone valve 210 has a pressure sensing plate (not shown in the figure) attached to its surface, and the pull rod 212 is equipped with a synchronous sensing display (not shown in the figure), which is connected to the pressure sensing plate.

[0065] The amount of concrete poured into the lower inclined front support 2 is determined by detecting the concrete overflowing into the limiting groove 29 using a pressure sensor. After the lower inclined front support 2 is filled with concrete, i.e., when the pressure sensor detects the pressure of the concrete, the pressure value is displayed by a synchronous sensor display. The operator can then use the pull rod 212 to lift the cone valve 210 until it is locked in the cone valve bayonet 16, thereby sealing the cone valve bayonet 16 and the lower inclined front support 2.

[0066] The pressure sensor and synchronous sensor display can adopt the existing pressure sensing system, which is a common technique for pressure detection in this field and will not be described in detail here.

[0067] Please see the appendix Figure 1 To be continued Figure 11 A construction method for a detachable and modular inclined front bracing structure includes the following steps:

[0068] Step 1: Fabricate the upper inclined front brace 1, the lower inclined front brace 2, and the connecting section 3 according to the support load requirements.

[0069] When the connecting section 3 adopts a pre-filled rigid overflow connecting section, in step 1, the lower section of the inclined front support 2 is pre-filled with concrete on the ground using the inclined pouring method in the factory, and the flip cover 28 is turned over and opened to observe the pre-filling of concrete through the observation hole 26 and the overflow vent 27.

[0070] The inclined pouring method involves placing the lower end of the lower inclined front support 2 at an angle on the ground, with the first limiting block 8 holding it in place and the second limiting block 9 positioned below the upper end of the lower inclined front support 2. Concrete is then poured from the upper end of the lower inclined front support 2 into its interior. (See attached diagram.) Figure 7 As shown.

[0071] When the connecting section 3 adopts an in-situ grouting unidirectional closed connecting section, in step 1, the lower inclined front support 2 is not grouted with concrete.

[0072] Step 2: Transport the upper section of the inclined front support 1, the lower section of the inclined front support 2, and the connecting section to the construction site, and drive the lower section of the inclined front support 2 into the soil at the designed angle.

[0073] When the connecting section 3 adopts an in-situ grouting unidirectional closed connecting section, in step 2, after the lower section inclined front support 2 is installed in place, concrete is poured into the lower section inclined front support 2. The pouring method is as follows:

[0074] The concrete conduit 10 is inserted into the lower inclined front support 2 through the conical valve bayonet 16. Self-flowing concrete is poured into the lower inclined front support 2 through the concrete conduit 10 until it overflows into the limiting groove 29. The pressure sensor on the surface of the conical valve 210 senses the pressure of the self-flowing concrete and displays the pressure via a synchronous sensor display. The concrete conduit 10 is then pulled out, and the pull rod 212 is pulled up, causing the conical valve 210 to rise synchronously into the conical valve bayonet 16 of the base 11 and close the conical valve bayonet 16. (See attached diagram.) Figure 11 As shown.

[0075] Step 3: Connect the lower end of the upper section of the inclined front support 1 to the upper end of the lower section of the inclined front support 2 through the connecting section 3 to form a detachable and modular inclined front support.

[0076] The method of connecting the lower end of the upper inclined front support 1 and the upper end of the lower inclined front support 2 via the connecting section 3 is as follows: insert the sub-buckle 13 at the bottom of the base 11 of the upper inclined front support 1 into the female buckle 25 on the first top seat 21 at the top of the lower inclined front support 2, and connect and fix the base 11 and the first top seat 21 through several connectors 17.

[0077] Step 4: Install the prestressed automatic servo system 5 on the upper end of the upper inclined front support 1 and support it on the bent extension section of the capping beam 6.

[0078] Step 5: Construct the base plate 4 of the main structure, and after the base plate 4 is cured, separate the upper section of the inclined front support 1 and the lower section of the inclined front support 2 by disassembling the connecting section 3 to achieve the rapid disassembly of the upper section of the inclined front support 1.

[0079] When disassembling the connecting section, simply loosen each connecting piece 17 and pull the male buckle 13 out of the female buckle 25.

[0080] The upper inclined front support 1 can be directly disassembled without sawing or damaging it, and can be completely recycled and reused. The industrialized construction process of "segmented prefabrication - (factory pre-grouting of rigid overflow connection section) - on-site assembly - rapid disassembly" can shorten the construction period, reduce costs, speed up material turnover, and reduce building material waste. It has the advantages of safety, reliability, high efficiency, and green and low carbon emissions.

[0081] The detachable and modular inclined front support structure of the present invention, through segmented design (i.e., upper inclined front support 1, lower inclined front support 2 and connecting section 3) and modular connection nodes, can significantly improve the structural performance and technical economy of foundation pit support engineering, and has the advantages of shortening the construction period, reducing losses, being safe and reliable, and being green and low-carbon.

[0082] In terms of structural performance, a segmented combination of the lower inclined front support 2 and the upper inclined front support 1 is adopted to give full play to the high compressive strength of the lower inclined front support 2 of the steel-concrete composite structure, effectively solving the defect of insufficient bearing capacity of traditional inclined front supports; by optimizing the cross-sectional dimensions and the convex design on the outer wall of the lower inclined front support 2, the amount of material used is reduced while the frictional resistance at the bottom of the pit is increased, ensuring the stability under deep foundation pit or high earth pressure conditions.

[0083] In terms of construction efficiency, two types of connection sections 3 are used: a "pre-cast rigid overflow connection section" and an "in-situ grouting one-way closed connection section," respectively adapting to the needs of factory precast grouting and on-site grouting. The former achieves node rigidity and non-destructive disassembly through the mechanical self-locking of the annular male buckle 13 and female buckle 25, the engagement of the cross limit plate 14 with the shear groove 15 of the top seat structure, and the coordinated force of the connector 17. The latter, through the cone valve 210 and pressure sensing plate, combined with the linkage of the limit groove 29 and the tie rod 212, ensures the dense sealing of the in-situ grouting concrete in the lower inclined front support 2, and can also achieve non-destructive disassembly of the upper inclined front support 1. Both can avoid the problem of increased resistance caused by the outward protrusion of traditional flanges, and the size of the connection section 3 is consistent with the size of the steel pipe, ensuring smooth oblique driving.

[0084] More importantly, the structure of this invention has the advantages of an industrialized construction process: for the pre-casting scheme, it forms a closed-loop system of "segmented prefabrication - factory casting - on-site assembly - rapid disassembly", which can significantly shorten the construction period; for the in-situ casting scheme, the entire inclined front brace is driven in and then sealed for casting, which simplifies the construction process and ensures the casting quality. Both methods can achieve the non-destructive recycling of the upper inclined front brace 1 (100% recycling rate) by loosening the connector 17 and the female fastener 13 / 25 after the main structure base plate has been cured, completely solving the problems of low efficiency, waste accumulation and cost waste of traditional cutting and demolition.

[0085] Meanwhile, the prestressed automatic servo system 5 and the irregularly shaped capping beam 6 work together to ensure efficient transmission of water and soil pressure. The conical pointed pile head design of the lower inclined front support 2 further optimizes the driving performance, and the setting of the water-stop steel plate 7 inside the bottom plate 4 enhances the reliability of waterproofing.

[0086] In summary, this invention can comprehensively reduce engineering costs, shorten construction period, reduce building material waste and carbon emissions under the same support requirements, and has the advantages of high safety, convenient construction and green sustainability. It provides a technologically advanced solution for foundation pit engineering and has good technical, economic and social benefits.

[0087] The above description is merely a description of preferred embodiments of the present invention and is not intended to limit the scope of the present invention in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. A detachable and modular inclined front support structure, characterized in that, include: The upper section of the inclined front support (1), the lower section of the inclined front support (2), and the connecting section (3) are arranged in a diagonal manner. The lower section of the inclined front support (2) is inserted diagonally below the bottom plate (4) of the main structure. The upper section of the inclined front support (1) is diagonally supported between the bottom plate (4) of the main structure and the capping beam (6) of the enclosure structure. The lower end of the lower section of the inclined front support (2) is coaxially and detachably connected to the upper section of the inclined front support (1) through the connecting section (3) to form a detachable and combined inclined front support.

2. The detachable and modular inclined front support structure as described in claim 1, characterized in that, One end of the capping beam (6) is fixedly connected to the enclosure structure, and the other end of the capping beam (6) extends obliquely downward to form a bent extension section. The upper end of the upper inclined front support (1) is supported on the bent extension section of the capping beam (6) by the prestressed automatic servo system (5). The upper inclined front support (1), the prestressed automatic servo system (5) and the bent extension section of the capping beam (6) are arranged coaxially.

3. The detachable and modular inclined front support structure as described in claim 1 or 2, characterized in that, The lower end of the upper inclined front support (1) is provided with a base (11), and a ring-shaped sub-buckle (13) is formed on the bottom surface of the base (11). The upper end of the lower inclined front support (2) is provided with a top seat structure, and a ring-shaped female buckle (25) is formed on the top surface of the top seat structure. The sub-buckle (13) is matched and inserted into the female buckle (25), so that the base (11) and the top seat structure are detachably connected. The base (11) and the top seat structure are connected and fixed by several circumferentially arranged connectors (17), forming a coaxial detachable connection section (3) between the upper inclined front support (1) and the lower inclined front support (2).

4. The detachable and modular inclined front support structure as described in claim 3, characterized in that, The top seat structure includes a first top seat (21), a second top seat (22), an outer wall (23) of the top seat, and an inner wall (24) of the top seat. The outer wall (23) and the inner wall (24) of the top seat form a ring structure and are connected between the first top seat (21) and the second top seat (22) to form a hollow top seat structure. The second top seat (22) is fixedly installed at the upper end of the lower inclined front support (2). The top surface of the first top seat (21) is attached to the bottom surface of the base (11) and connected by several connectors (17). Several observation holes (26) are formed at intervals on the outer wall (23) of the top seat. The several observation holes (26) are respectively located on the outside of the several connectors (17). The female buckle (25) is formed inwardly on the top of the inner wall (24) of the top seat.

5. The detachable and modular inclined front support structure as described in claim 4, characterized in that, The upper inclined front support (1) is a smooth steel pipe. The diameter of the upper inclined front support (1) is smaller than the diameter of the base (11). Several stiffening ribs (12) are provided between the base (11) and the upper inclined front support (1). The stiffening ribs (12) and several connecting pieces (17) are arranged alternately.

6. The detachable and combinable inclined front support structure as described in claim 4, characterized in that, The base (11), the first top seat (21), the second top seat (22) and the lower inclined front support (2) have the same diameter. The diameter of the upper inclined front support (1) is smaller than that of the lower inclined front support (2). The lower inclined front support (2) is a steel pipe with raised patterns on its outer wall. Concrete is poured into the lower inclined front support (2). The lower end of the lower inclined front support (2) is a conical pointed pile head. A water-stop steel plate (7) is provided at the junction of the lower inclined front support (2) and the base plate (4).

7. The detachable and combinable inclined front support structure as described in claim 4, characterized in that, When the connecting section (3) is a pre-filled rigid overflow connecting section, a cross limiting plate (14) is provided on the bottom surface of the base (11). The cross limiting plate (14) is located inside the buckle (13) and inserted into the hollow part of the top seat structure. The side wall of the cross limiting plate (14) and the inner wall of the inner side wall (24) of the top seat are intermittently formed with concave and convex shear grooves (15). When the cross limiting plate (14) is inserted into the inner side wall (24) of the top seat, the shear grooves (15) on the cross limiting plate (14) and the shear grooves (15) on the inner side wall (24) of the top seat are engaged and connected. The second base (22) is provided with an overflow vent (27) with a ring structure and a flip cover (28). The flip cover (28) is provided with a handle. When the connecting section (3) is an in-situ injection unidirectional closed connecting section, a conical valve bayonet (16) is formed in the middle of the base (11). The conical valve bayonet (16) is a conical structure with a small opening at the top and a large opening at the bottom. A limiting groove (29) is fixed in the inner side wall (24) of the top seat by several positioning rods (211). A conical valve (210) is provided in the limiting groove (29). A pull rod (212) is connected to the cone top of the conical valve (210). The pull rod (212) extends upward through the conical valve bayonet (16) and then extends to the top of the upper inclined front support (1), so that the conical valve (210) can be raised and lowered by the pull rod (212) and can be closed and locked in the conical valve bayonet (16). A pressure sensing plate is attached to the surface of the conical valve (210). A synchronous sensing display is provided on the pull rod (212). The synchronous sensing display is connected to the pressure sensing plate.

8. A construction method for the detachable and modular inclined front bracing structure as described in claim 7, characterized in that, Includes the following steps: Step 1: Fabricate the upper inclined front brace (1), the lower inclined front brace (2), and the connecting section (3) according to the support load requirements; Step 2: Transport the upper section of the inclined front support (1), the lower section of the inclined front support (2) and the connecting section to the construction site, and drive the lower section of the inclined front support (2) into the soil at the designed angle; Step 3: Connect the lower end of the upper section of the inclined front support (1) to the upper end of the lower section of the inclined front support (2) through the connecting section (3) to form a detachable and combinable inclined front support; Step 4: Install the prestressed automatic servo system (5) on the upper end of the upper inclined front support (1) and support it on the bent extension section of the capping beam (6); Step 5: Construct the base plate (4) of the main structure, and after the base plate (4) is cured, separate the upper section of the inclined front support (1) and the lower section of the inclined front support (2) by disassembling the connecting section (3) to achieve the rapid disassembly of the upper section of the inclined front support (1).

9. The construction method as described in claim 8, characterized in that, When the connecting section (3) adopts the pre-filled rigid overflow connecting section, in step 1, the lower section of the inclined front support (2) is pre-filled with concrete on the ground using the inclined pouring method in the factory, and the flip cover (28) is turned over and opened. The pre-filling of concrete is observed through the observation hole (26) and the overflow vent (27). When the connecting section (3) adopts the in-situ grouting unidirectional closed connecting section, in step 1, the lower inclined front support (2) is not grouted with concrete; in step 2, after the lower inclined front support (2) is installed in place, concrete is grouted inside the lower inclined front support (2), and the grouting method is as follows: The concrete conduit (10) is inserted into the lower inclined front support (2) through the cone valve bayonet (16). Self-flowing concrete is poured into the lower inclined front support (2) through the concrete conduit (10). The self-flowing concrete is poured into the overflow limiting groove (29). The pressure sensor on the surface of the cone valve (210) senses the pressure of the self-flowing concrete and displays the pressure through the synchronous sensing display. The concrete conduit (10) is pulled out and the pull rod (212) is pulled up so that the cone valve (210) is synchronously lifted into the cone valve bayonet (16) of the base (11) and the cone valve bayonet (16) is closed.

10. The construction method as described in claim 8, characterized in that, The method of connecting the lower end of the upper inclined front support (1) and the upper end of the lower inclined front support (2) by means of connecting section (3) is as follows: insert the sub-buckle (13) at the bottom of the base (11) of the upper inclined front support (1) into the female buckle (25) on the first top seat (21) at the top of the lower inclined front support (2), and connect and fix the base (11) and the first top seat (21) by means of several connectors (17).

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