Foundation pit supporting structure

Abstract

The utility model discloses a foundation pit supporting structure, relates to the technical field of foundation pit supporting devices, and aims at solving the problems that in an existing foundation pit supporting structure, a fixed waist beam is relatively low in universality and strict in installation angle requirement, the installation difficulty of the foundation pit supporting structure is increased, and the laying efficiency of the foundation pit supporting structure is reduced. The device comprises a waterproof curtain layer, a supporting pile layer, a crown beam and a plurality of anchor cable sets, and further comprises a plurality of I-shaped steel sets and a plurality of I-shaped steel support sets, the I-shaped steel sets are sequentially arranged on the inner side of the supporting pile layer at equal intervals in the depth direction of a target foundation pit, and each I-shaped steel set corresponds to one anchor cable set; each I-shaped steel set is installed on the supporting pile layer through one I-shaped steel support set, and the stretching and fastening section of each anchor cable assembly in the same anchor cable set is inserted into the corresponding I-shaped steel set and fixed to the corresponding I-shaped steel set through an anchorage device. The supporting structure is mainly used for supporting and protecting the foundation pit in the foundation pit construction work.

Description

Technical Field

[0001] The utility model relates to the technical field of foundation pit supporting devices, in particular to a foundation pit supporting structure. Background Art

[0002] Foundation pit support is an important structure to ensure the safety of underground structure construction and the surrounding environment of the foundation pit. Traditional foundation pit support is mainly composed of support piles, water-stop curtains and pre-tightened anchor cables. First, support piles are poured along the edge of the target foundation pit. The support pile layer composed of multiple support piles is used as the main body of the support structure. A water-stop curtain is set on the outside of the support pile layer to prevent or reduce the flow of groundwater from the side wall of the foundation pit into the foundation pit. Finally, pre-tightened anchor cables are set in the foundation pit infrastructure and anchored by pressure grouting. During pressure grouting, when the anchor strength reaches 80% of the design strength, the anchor cable needs to be tensioned. The waist beam is needed when tensioning the anchor cable. As a supporting component of the tensioning component, the traditional waist beam structure is designed as a beam with a fixed inclined surface based on the insertion angle of the anchor cable. The insertion angle of the anchor cable will be adjusted accordingly according to the soil structure of the infrastructure around the foundation pit. The general insertion angle is 25 to 30 degrees along the horizontal plane. The versatility of the fixed waist beam is relatively low, and the requirements for the installation angle are relatively strict, which increases the difficulty of installing the foundation pit support. Therefore, in order to improve the versatility of the waist beam in the traditional foundation pit support structure, reduce the difficulty of installing the foundation pit support, and improve the layout efficiency of the foundation pit support structure, it is very in line with actual needs to develop a foundation pit support structure. Utility Model Content

[0003] The utility model provides a foundation pit support structure in order to solve the problems that the fixed waist beam in the existing foundation pit support has relatively low versatility and strict requirements on the installation angle, which increases the installation difficulty of the foundation pit support and reduces the layout efficiency of the foundation pit support;

[0004] A foundation pit support structure includes a water-stop curtain layer, a supporting pile layer, a crown beam, and multiple anchor cable groups. The supporting pile layer is inserted into the foundation structure at the edge of the target foundation pit. The crown beam is arranged on top of the supporting pile layer, and the crown beam and the supporting pile layer are integrally formed. The water-stop curtain layer is arranged outside the supporting pile layer, and the water-stop curtain layer is inserted into the foundation structure outside the target foundation pit.

[0005] The support pile layer includes a plurality of support piles, which are equidistantly arranged in sequence along the extension direction of the edge of the target foundation pit, and each support pile is arranged perpendicular to the bottom of the target foundation pit, and a plurality of anchor cable groups are equidistantly inserted in the foundation of the target foundation pit in sequence along the depth direction of the target foundation pit;

[0006] Each anchor cable group includes multiple anchor cable components, which are equidistantly arranged in the extension direction of the edge of the target foundation pit, and each anchor cable component is correspondingly inserted between two adjacent support piles. The anchoring section and free section of each anchor cable component are inserted in the foundation of the target foundation pit, and the tension and tightening section of each anchor cable component extends to the inner side of the support pile layer;

[0007] The foundation pit support structure also includes a plurality of I-beam groups and a plurality of I-beam support groups. The plurality of I-beam groups are equidistantly arranged on the inner side of the support pile layer along the depth direction of the target foundation pit, and each I-beam group is correspondingly arranged with an anchor cable group. Each I-beam group is installed on the support pile layer through an I-beam support group. The tensile fastening section of each anchor cable assembly in the same anchor cable group is inserted into the corresponding I-beam group and fixed to the I-beam group through an anchor.

[0008] The I-beam group includes two I-beams, and the tension fastening section of each anchor cable assembly in the same anchor cable group passes through the gap between the two I-beams in the corresponding I-beam group and extends to the inner side of the support pile layer, and each anchor cable assembly is fixed between the two I-beams by an anchor located outside the I-beam group;

[0009] The I-beam support group includes a plurality of I-beam supports, which are arranged in sequence and equidistantly along the extension direction of the edge of the target foundation pit, and each I-beam support is detachably connected to a support pile in the support pile layer, and two I-beams in the same I-beam group are arranged in parallel on the plurality of I-beam supports in the corresponding I-beam support group and are welded and fixed to the plurality of I-beam supports;

[0010] Furthermore, the spacing between the water-stop curtain layer and the supporting pile layer is greater than 1 meter;

[0011] Furthermore, the anchor cable assembly is inserted in a direction inclined downward along the horizontal line, with an insertion angle of 25° to 30°;

[0012] Furthermore, the anchor cable assembly includes a guide cap, a fastening ring, a wire rack, multiple steel strands and multiple bellows. An inclined hole for the anchor cable is processed on the infrastructure of the target foundation pit. The anchoring sections and free sections of the multiple steel strands are inserted into the inclined hole for the anchor cable, and the axis of each steel strand is arranged parallel to the axis of the inclined hole for the anchor cable. The anchoring sections of the multiple steel strands are sequentially fitted with a wire rack, a fastening ring and a guide cap, and the guide cap is fitted on the end of the multiple steel strands. A bellows is fitted on the free section of each steel strand. The tensile fastening section of each steel strand extends to the outside of the inclined hole for the anchor cable and to the inside of the supporting pile layer. The inclined hole for the anchor cable is filled with concrete paddle, and the multiple steel strands are anchored and connected to the inclined hole for the anchor cable after the concrete paddle solidifies.

[0013] Furthermore, the I-beam bracket includes a right-angle tripod, a support plate, a damping lifting rod, an upper hinged plate, an I-beam waist beam support plate and a lower sliding hinged plate. The right-angle tripod is arranged on the inner side of the supporting pile layer, and the vertical right-angle side plate in the right-angle tripod is connected to the outer wall of the corresponding supporting pile by bolts. The horizontal right-angle side plate in the right-angle tripod is located above the oblique side plate in the right-angle tripod, and the horizontal right-angle side plate in the right-angle tripod is perpendicular to the axis of the corresponding supporting pile. The support plate is laid on the horizontal right-angle side plate in the right-angle tripod, and the support plate is welded and fixed to the right-angle tripod. The damping lifting rod is upright on the support plate in the vertical direction. Close to the top of one end of the supporting pile, and the bottom of the damping lifting rod is fixedly connected to the support plate, the upper hinged plate is fixed to the top of the damping lifting rod, the lower sliding hinged plate is arranged on the top of the support plate, and the lower sliding hinged plate is detachably connected to the support plate by bolts, the I-beam waist support plate is arranged between the upper hinged plate and the lower sliding hinged plate, and one end of the I-beam waist support plate is hinged to the upper hinged plate, and the other end of the I-beam waist support plate is hinged to the lower sliding hinged plate, the two I-beams in the same I-beam group are arranged in parallel on the I-beam waist support plate, and each I-beam is welded and fixed to the I-beam waist support plate:

[0014] Furthermore, the I-beam waist beam support plate is arranged perpendicularly to the anchor cable assembly;

[0015] Furthermore, two threaded holes are processed on the top of the support plate, and two strip holes are processed on the top of the lower sliding hinge plate along the length extension direction of the support plate, and each strip hole is corresponding to a threaded hole. The threaded section of each bolt passes through a strip hole in turn and is inserted into the corresponding threaded hole, and each bolt is threadedly connected to the top of the support plate in a detachable manner.

[0016] Furthermore, two L-shaped positioning plates are provided on one side of the I-beam waist beam support plate for supporting the I-beam, and the two L-shaped positioning plates are arranged parallel to and opposite to each other along the center line of the length direction of the I-beam waist beam support plate, and each L-shaped positioning plate is fixedly connected to the I-beam waist beam support plate;

[0017] Furthermore, the foundation pit support structure also includes a plurality of auxiliary support units, each auxiliary support unit includes a support rod and an embedded cone assembly, a connecting plate is fixedly connected to the bottom of the hypotenuse plate in each right-angle tripod, the embedded cone assembly is located on the inner side of the supporting pile layer, and the embedded cone assembly is corresponding to a supporting pile, the bottom of the embedded cone assembly is inserted into the infrastructure at the bottom of the foundation pit, the top of the embedded cone assembly extends into the foundation pit, the support rod is provided between the embedded cone assembly and any one of the I-beam brackets on the corresponding supporting pile, and one end of the support rod is detachably connected to the top of the embedded cone assembly, and the other end of the support rod is detachably connected to the connecting plate in the corresponding I-beam bracket;

[0018] Furthermore, the embedded cone assembly includes a mounting plate, an upper mounting block and multiple embedded cones, the multiple embedded cones are arranged at the bottom of the mounting plate in the vertical direction, and the top end of each embedded cone is fixedly connected to the mounting plate, the upper mounting block is arranged at the top center of the mounting plate, and the bottom end of each upper mounting block is fixedly connected to the mounting plate, and the top end of the upper mounting block is detachably connected to one end of the support rod.

[0019] The beneficial effects of this application compared to the prior art are as follows:

[0020] 1. The present application provides a foundation pit support structure. Compared with the traditional foundation pit support, the present application adopts two I-beam waist beams to replace the traditional concrete waist beam structure. By cooperating with the I-beam bracket with adjustable support angle, the I-beam waist beam can be matched with the anchor cable structure with different insertion angles (25°~30°), which improves the versatility and adjustability of the waist beam, greatly reduces the requirements for the installation angle of the waist beam, reduces the installation difficulty of the foundation pit support, and improves the layout efficiency of the foundation pit support.

[0021] 2. The present application provides a foundation pit support structure, which can cooperate with the auxiliary support structure by optimizing the structure of the installation bracket of the waist beam compared to the traditional foundation pit support. On the one hand, such a design can provide auxiliary support for the support piles exposed in the foundation pit when the foundation pit support is arranged layer by layer, thereby ensuring the stability of the layer-by-layer support arrangement. On the other hand, the arranged foundation pit support can also be fully supported by adding support rods of different lengths. The support points are flexible and selectable and can be adjusted to adapt to different construction environments, thereby improving the stability of the foundation pit support arrangement and the safety of workers in subsequent construction in the foundation pit. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A side view schematic diagram of the foundation pit support structure described in this application;

[0023] Figure 2 This is a schematic diagram of the state of the foundation pit support structure described in this application during deployment;

[0024] Figure 3 A schematic diagram of the auxiliary support state of the bottom support part of the foundation pit support structure described in this application;

[0025] Figure 4 A schematic diagram of the auxiliary support state of the foundation pit support structure as a whole described in this application;

[0026] Figure 5 This is a schematic diagram of the main view of the foundation pit support structure described in this application;

[0027] Figure 6 A schematic diagram of the main view of the auxiliary support for the entire foundation pit support structure described in this application;

[0028] Figure 7 This is a schematic structural diagram of the anchor cable assembly in the foundation pit support structure described in this application;

[0029] Figure 8 This is a schematic diagram of the structure of the I-beam support in the foundation pit support structure described in this application;

[0030] Figure 9 A side view schematic diagram of an I-beam support in the foundation pit support structure described in this application;

[0031] Figure 10 This is a schematic diagram of the state when the I-beam waist beam is installed in the I-beam bracket of the foundation pit support structure described in this application;

[0032] Figure 11 This is a structural diagram of the auxiliary support in the foundation pit support structure described in this application;

[0033] In the figure, 1 is a water-stop curtain layer, 2 is a supporting pile layer, 3 is a crown beam, 4 is an anchor cable assembly, 41 is a guide cap, 42 is a fastening ring, 43 is a wire ring, 44 is a plurality of steel strands, 45 is a corrugated pipe, 5 is an I-beam bracket, 51 is a right-angle tripod, 52 is a support plate, 53 is a damping lifting rod, 54 is an upper hinged plate, 55 is an I-beam waist beam support plate, 551 is an L-shaped positioning plate, 56 is a lower sliding hinged plate, 57 is a connecting plate, 6 is a support rod, 7 is an embedded cone assembly, 71 is a mounting plate, 72 is an embedded cone, 73 is an upper mounting block, 8 is an I-beam, 9 is an anchor, 10 is an inclined hole for an anchor cable and 11 is a concrete paddle. DETAILED DESCRIPTION

[0034] Specific implementation method 1: Combination Figures 1 to 11 This embodiment is described. In this embodiment, a foundation pit support structure is provided. The foundation pit support structure includes a water-stop curtain layer 1, a supporting pile layer 2, a crown beam 3, and a plurality of anchor cable groups. The supporting pile layer 2 is inserted into the infrastructure at the edge of the target foundation pit. The crown beam 3 is arranged on the top of the supporting pile layer 2, and the crown beam 3 and the supporting pile layer 2 are integrally formed. The water-stop curtain layer 1 is arranged on the outside of the supporting pile layer 2, and the water-stop curtain layer 1 is inserted into the infrastructure outside the target foundation pit.

[0035] The support pile layer 2 includes a plurality of support piles, which are equidistantly arranged in sequence along the extension direction of the edge of the target foundation pit, and each support pile is arranged perpendicular to the bottom of the target foundation pit, and a plurality of anchor cable groups are equidistantly inserted in the foundation of the target foundation pit in sequence along the depth direction of the target foundation pit;

[0036] Each anchor cable group includes a plurality of anchor cable components 4, which are arranged in sequence and equidistantly along the extension direction of the edge of the target foundation pit, and each anchor cable component 4 is correspondingly inserted between two adjacent support piles. The anchoring section and free section of each anchor cable component 4 are inserted in the foundation of the target foundation pit, and the tension and tightening section of each anchor cable component 4 extends to the inner side of the support pile layer 2;

[0037] The foundation pit support structure also includes a plurality of I-beam groups and a plurality of I-beam support groups. The plurality of I-beam groups are equidistantly arranged on the inner side of the support pile layer 2 along the depth direction of the target foundation pit, and each I-beam group is correspondingly arranged with an anchor cable group. Each I-beam group is installed on the support pile layer 2 through an I-beam support group. The tensile fastening section of each anchor cable assembly 4 in the same anchor cable group is inserted into the corresponding I-beam group and fixed to the I-beam group through an anchor 9.

[0038] The I-beam group includes two I-beams 8. The tensioning and fastening section of each anchor cable assembly 4 in the same anchor cable group passes through the gap between the two I-beams 8 in the corresponding I-beam group and extends to the inner side of the supporting pile layer 2. Each anchor cable assembly 4 is fixed between the two I-beams 8 by an anchor 9 located outside the I-beam group.

[0039] The I-beam support group includes multiple I-beam supports 5, which are arranged in sequence and equidistantly along the extension direction of the edge of the target foundation pit, and each I-beam support 5 is detachably connected to a support pile in the support pile layer 2. Two I-beams 8 in the same I-beam group are arranged in parallel on the multiple I-beam supports 5 in the corresponding I-beam support group and are welded and fixed to the multiple I-beam supports 5.

[0040] A foundation pit support structure provided in this embodiment adopts an I-beam group 4 to replace the traditional concrete waist beam structure. By cooperating with an I-beam bracket 5 with adjustable support angle, the I-beam waist beam can be matched with anchor cable components 4 with different insertion angles, thereby improving the versatility and adjustability of the waist beam, greatly reducing the requirements for the installation angle of the waist beam, reducing the installation difficulty of the foundation pit support, and improving the layout efficiency of the foundation pit support.

[0041] Specific implementation method 2: Combination Figures 1 to 11 This embodiment is described. The difference between this embodiment and the first embodiment is that the distance between the water-stop curtain layer 1 and the supporting pile layer 2 is greater than 1 meter. The other components and connection methods are the same as those of the first embodiment.

[0042] Specific implementation method three: Combination Figures 1 to 11 This embodiment differs from the second embodiment in that the anchor cable assembly 4 is inserted downward along the horizontal line at an angle of 25° to 30°. Other components and connection methods are the same as those of the second embodiment.

[0043] Specific implementation method four: Combination Figures 1 to 11 The present embodiment is described. The difference between the present embodiment and the specific embodiment 3 is that the anchor cable assembly 4 includes a guide cap 41, a fastening ring 42, a wire ring 43, a plurality of steel strands 44 and a plurality of corrugated tubes 45. An anchor cable inclined hole 10 is processed on the foundation of the target foundation pit. The anchoring sections and free sections of the plurality of steel strands 44 are inserted into the anchor cable inclined hole 10, and the axis of each steel strand 44 is arranged parallel to the axis of the anchor cable inclined hole 10. The system is sequentially assembled with a stringing ring 43, a fastening ring 42, and a guide cap 41. The guide cap 41 is fitted over the ends of multiple steel strands 44. A bellows 45 is fitted over the free end of each strand 44. The tensioned and fastened end of each strand 44 extends outside the inclined anchor hole 10 and inside the support pile layer 2. The inclined anchor hole 10 is filled with a concrete paddle 11, and the multiple steel strands 44 are anchored to the inclined anchor hole 10 after the concrete paddle 11 solidifies. Other components and connection methods are the same as those in the third embodiment.

[0044] In this embodiment, the guide cap 41 is used to fix the insertion ends of the multiple steel strands 44, which can facilitate the synchronous insertion of the multiple steel strands 44. The fastening ring 42 and the stringing ring 43 are used to fix the anchoring sections of the multiple steel strands 44. The bellows 45 is used to wrap the free ends of the multiple steel strands 44 to isolate the mud so that the steel strands 44 can freely contract in the bellows 45 to exert their prestress. Figure 7 A is a tensioning and tightening section, B is a free section, and C is an anchoring section. The number of the steel strands 44 is 4 to 8 according to design requirements.

[0045] Specific implementation method five: Combination Figures 1 to 11Describing this embodiment, the difference between this embodiment and the specific embodiment 4 is that the I-beam bracket 5 includes a right-angled tripod 51, a support plate 52, a damping lifting rod 53, an upper hinged plate 54, an I-beam waist beam support plate 55 and a lower sliding hinged plate 56. The right-angled tripod 51 is arranged on the inner side of the supporting pile layer 2, and the vertical right-angled side plate of the right-angled tripod 51 is connected to the outer wall of the corresponding supporting pile by bolts. The horizontal right-angled side plate of the right-angled tripod 51 is located above the oblique side plate of the right-angled tripod 51, and the horizontal right-angled side plate of the right-angled tripod 51 is perpendicular to the axis of the corresponding supporting pile. The support plate 52 is laid on the horizontal right-angled side plate of the right-angled tripod 51, and the support plate 52 is welded and fixed to the right-angled tripod 51. The damping lifting rod 53 is connected along the vertical The vertical structure is located at the top of the support plate 52 near the support pile, and the bottom of the damping lifting rod 53 is fixedly connected to the support plate 52. The upper hinge plate 54 is fixed to the top of the damping lifting rod 53. The lower sliding hinge plate 56 is set on the top of the support plate 52 and is detachably connected to the support plate 52 via bolts. The I-beam waist support plate 55 is set between the upper hinge plate 54 and the lower sliding hinge plate 56, with one end of the I-beam waist support plate 55 hinged to the upper hinge plate 54 and the other end of the I-beam waist support plate 55 hinged to the lower sliding hinge plate 56. Two I-beams 8 in the same I-beam group are arranged parallel to the I-beam waist support plate 55, and each I-beam 8 is welded to the I-beam waist support plate 55. The other components and connection methods are the same as those of the fourth embodiment.

[0046] The biggest feature of the I-beam bracket 5 provided in this embodiment is that the inclination angle of the I-beam waist beam support plate 55 can be adjusted, which can adapt to the coordination of anchor cables with different insertion directions, ensuring the stability of the subsequent anchor cable tensioning process using the jack. The working position of the I-beam waist beam support plate 55 is locked by the coordination position of the lower sliding hinge plate 56 and the support plate 52. The lower sliding hinge plate 56 can slide back and forth along the support plate 52, and the damping lifting rod 53 will also move up and down with the movement of the lower sliding hinge plate 56, thereby realizing the inclination of the I-beam waist beam support plate 55 fixedly limited by the two hinge points. At an oblique angle, the right-angle tripod 51 plays a supporting and fixing role during work. In order to improve the coordination between the right-angle tripod 51 and the supporting piles, the coordination surface between the vertical right-angle side plate in the right-angle tripod 51 and the supporting piles is set as an arc surface. In order to further improve the stability of the I-beam bracket 5, the upper hinged plate 54 can be optimized into an L-shaped plate. After optimization, the horizontal part of the upper hinged plate 54 is fixed to the top of the damping lifting rod 53, and is hinged to one end of the I-beam waist beam support plate 55. After optimization, the vertical part of the upper hinged plate 54 can be disassembled and connected to the supporting piles by bolts on the premise that the position of the I-beam waist beam support plate 55 is determined.

[0047] Specific implementation method six: combination Figures 1 to 11 This embodiment is described. The difference between this embodiment and the fifth embodiment is that the I-beam waist beam support plate 55 is arranged perpendicular to the anchor cable assembly 4. The other components and connection methods are the same as those of the fifth embodiment.

[0048] This arrangement is to ensure the stability of the anchor cable assembly 4 during subsequent tensioning.

[0049] Specific implementation method seven: combination Figures 1 to 11 This embodiment differs from the sixth embodiment in that two threaded holes are machined on the top of the support plate 52, and two strip-shaped holes are machined on the top of the lower sliding hinge plate 56 along the length of the support plate 52. Each strip-shaped hole corresponds to a threaded hole, and the threaded section of each bolt passes through a strip-shaped hole and is inserted into the corresponding threaded hole. Each bolt is threadedly connected to the top support plate 52 in a detachable manner. The rest of the components and connection methods are the same as those of the sixth embodiment.

[0050] With this arrangement, when the bolts are loosened, the position of the lower sliding hinge plate 56 can be adjusted by sliding the two strip holes on the lower sliding hinge plate 56 relative to the position of the bolts, thereby adjusting the working angle of the I-beam waist beam support plate 55.

[0051] Specific implementation method eight: combination Figures 1 to 11 This embodiment differs from the seventh embodiment in that two L-shaped positioning plates 551 are provided on the side of the I-beam waist support plate 55 that supports the I-beam 8. The two L-shaped positioning plates 551 are arranged parallel to and opposite each other along the centerline of the longitudinal direction of the I-beam waist support plate 55, and each L-shaped positioning plate 551 is fixedly connected to the I-beam waist support plate 55. The remaining components and connection methods are the same as those of the seventh embodiment.

[0052] With this arrangement, the L-shaped positioning plate 551 is used to position the I-beam 8 . When welding the I-beam 8 , the welding position of the I-beam 8 can be determined by pushing the I-beam 8 into contact with the corresponding L-shaped positioning plate 551 .

[0053] Specific implementation method nine: Combination Figures 1 to 11This embodiment is described. The difference between this embodiment and the eighth embodiment is that the foundation pit support structure also includes a plurality of auxiliary support units, each auxiliary support unit includes a support rod 6 and an embedded cone assembly 7. The bottom of the hypotenuse plate in each right-angle tripod 51 is fixedly connected with a connecting plate 57. The embedded cone assembly 7 is located on the inner side of the supporting pile layer 2, and the embedded cone assembly 7 is corresponding to a supporting pile. The bottom of the embedded cone assembly 7 is inserted into the foundation at the bottom of the foundation pit, and the top of the embedded cone assembly 7 extends into the foundation pit. The support rod 6 is provided between the embedded cone assembly 7 and any I-beam bracket 5 on the corresponding supporting pile, and one end of the support rod 6 is detachably connected to the top of the embedded cone assembly 7, and the other end of the support rod 6 is detachably connected to the connecting plate 57 in the corresponding I-beam bracket 5. Other components and connection methods are the same as those in the eighth embodiment.

[0054] Specific implementation method ten: Combination Figures 1 to 11 This embodiment differs from the ninth embodiment in that the embedded cone assembly 7 includes a mounting plate 71, an upper mounting block 73, and multiple embedded cones 72. The multiple embedded cones 72 are vertically arranged at the bottom of the mounting plate 71, and the top end of each embedded cone 72 is fixedly connected to the mounting plate 71. The upper mounting block 73 is arranged at the top center of the mounting plate 71, and the bottom end of each upper mounting block 73 is fixedly connected to the mounting plate 71. The top end of the upper mounting block 73 is detachably connected to one end of the support rod 6. Other components and connection methods are the same as those of the ninth embodiment.

[0055] In combination with the description of the ninth and tenth embodiments, the auxiliary support unit is introduced to reinforce the foundation pit support structure and improve the support strength of the foundation pit support structure. The present application uses the I-beam bracket 5 as the connection point with the auxiliary support unit, which can improve the functionality of the I-beam bracket 5 without having to re-set the connection structure. The auxiliary support unit has two main functions. On the one hand, it can provide auxiliary support for the support piles exposed in the foundation pit when the foundation pit support is arranged layer by layer, thereby ensuring the stability of the layer-by-layer support arrangement. Figure 3 As shown, the purpose of this arrangement is that, since the anchor cables are arranged layer by layer during the construction of the foundation pit support, and the arrangement time between two adjacent layers needs to be 7 to 10 days, during this period, the anchor cable tensioning force may be insufficient when the concrete slurry is not completely solidified, resulting in excessive pressure on the back of the support pile in the support structure and support collapse. Therefore, during this period, auxiliary support units are set on the front side of the support pile for auxiliary support, so as to maximize the support stability and construction safety of the support pile. On the other hand, the arranged foundation pit support can be fully supported by adding support rods of different lengths, such as Figure 4 and Figure 6As shown, this type of support structure is mainly used to provide secondary support to the entire support structure after the foundation pit support is arranged. In this arrangement, the support points are flexible and selectable, and can be adjusted to suit different construction environments, thereby improving the stability of the foundation pit support arrangement and the safety of workers in subsequent construction in the foundation pit.

[0056] The present invention has been disclosed as above with preferred implementation cases, but it is not intended to limit the present invention. Any technician familiar with the profession can make slight changes or modifications to the above-disclosed structures and technical contents without departing from the scope of the technical solution of the present invention. Equivalent implementation cases with equivalent changes can be made by using the above-disclosed structures and technical contents. However, any simple modifications, equivalent changes and modifications made to the above implementation cases based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

[0057] How it works

[0058] When using this embodiment, first determine the layout position of the support pile layer 2 according to the design requirements, and arrange the cast-in-place support piles according to the predetermined points. After all the cast-in-place support piles are arranged, perform horizontal excavation on the top of all the cast-in-place support piles and take out the concrete on the top of the cast-in-place support piles. At the same time, arrange the crown beam reinforcement structure, and then use the crown beam template to cast concrete for the second time to form a complete crown beam 3. Then arrange the water-stop curtain 1 1 meter outside the support pile layer 2. The water-stop curtain 1 is completed by the three-tube method of high-pressure rotary jet pile construction. After the water-stop curtain 1 is arranged, carry out the anchor cable construction. According to the design position and inclination of the anchor cable, Anchor cable inclined holes 10 are drilled at the foundation pit construction site. After drilling, the anchor cable assembly 4 is inserted to the designed depth and poured with cement slurry. When the anchor strength reaches 80% of the designed strength, the anchor cable needs to be tensioned. During the tensioning process, an I-beam waist beam needs to be arranged inside the support pile layer 2. First, the I-beam bracket 5 must be fixed. The I-beam bracket 5 is fixed to the corresponding support pile by bolts, and the working position of the I-beam waist beam support plate 55 is adjusted according to the inclination angle of the anchor cable. After the position of the I-beam waist beam support plate 55 is determined, the lower sliding hinged plate 56 is locked and fixed with the support plate 52 by bolts, and then the two The I-beam 8 is set on the I-beam waist beam support plate 55 and is positioned and welded by two L-shaped positioning plates 551. After the two I-beams 8 are fixed, the tensioning and fastening section (anchor head) of the anchor assembly 4 passes through the gap between the two I-beams 8 and is inserted into the anchor 9 located on the front side of the two I-beams 8. It is worth noting that according to construction needs, an anchor head pressure plate can be set on the anchor 9, or the two positioned and welded I-beams 8 can be welded and fixed to the overall structure by a welding plate. After the anchor assembly 4 and the anchor 9 are installed, the steel strand 44 is tensioned step by step by a jack. Design load, after the first group of anchor cable components 4 are tensioned, the second layer of anchor cable components 4 will be arranged at intervals of 7 to 10 days. During this period, the staff will choose whether to use auxiliary support structures to assist in supporting the support piles according to the actual situation on site. For the specific process, please refer to Specific Implementation Methods 9 to 10. After the interval date, repeat the above operations to arrange subsequent multiple anchor cable groups until the design depth is reached and the foundation pit support is arranged. At this time, the staff will choose whether to use auxiliary support structures to assist in supporting the support structure according to the actual situation on site. For the specific process, please refer to Specific Implementation Methods 9 to 10.

Claims

1. A foundation pit support structure, comprising a water-stop curtain layer (1), a supporting pile layer (2), a crown beam (3) and a plurality of anchor cable groups, wherein the supporting pile layer (2) is inserted into a foundation structure at the edge of a target foundation pit, the crown beam (3) is arranged on the top of the supporting pile layer (2), and the crown beam (3) and the supporting pile layer (2) are integrally formed, the water-stop curtain layer (1) is arranged outside the supporting pile layer (2), and the water-stop curtain layer (1) is inserted into the foundation structure outside the target foundation pit; The support pile layer (2) includes a plurality of support piles, which are arranged equidistantly along the extension direction of the edge of the target foundation pit, and each support pile is arranged perpendicular to the bottom of the target foundation pit, and a plurality of anchor cable groups are inserted into the foundation of the target foundation pit at equal intervals along the depth direction of the target foundation pit; Each anchor cable group includes a plurality of anchor cable assemblies (4), the plurality of anchor cable assemblies (4) are arranged in sequence and at equal intervals along the extension direction of the edge of the target foundation pit, and each anchor cable assembly (4) is correspondingly inserted between two adjacent support piles, the anchoring section and the free section of each anchor cable assembly (4) are inserted in the foundation of the target foundation pit, and the tensioning and tightening section of each anchor cable assembly (4) extends to the inner side of the support pile layer (2); Its characteristics are: The foundation pit support structure further comprises a plurality of I-beam groups and a plurality of I-beam bracket groups, wherein the plurality of I-beam groups are arranged in sequence and equidistantly on the inner side of the support pile layer (2) along the depth direction of the target foundation pit, and each I-beam group is arranged corresponding to an anchor cable group, and each I-beam group is installed on the support pile layer (2) via an I-beam bracket group, and the tension fastening section of each anchor cable assembly (4) in the same anchor cable group is inserted into the corresponding I-beam group and fixed to the corresponding I-beam group via an anchor (9); The I-beam group includes two I-beams (8), the tension fastening section of each anchor cable assembly (4) in the same anchor cable group passes through the gap between the two I-beams (8) in the corresponding I-beam group and extends to the inner side of the supporting pile layer (2), and each anchor cable assembly (4) is fixed between the two I-beams (8) by an anchor (9) located outside the I-beam group; The I-beam support group comprises a plurality of I-beam supports (5), wherein the plurality of I-beam supports (5) are arranged in sequence and equidistantly along the extension direction of the edge of the target foundation pit, and each I-beam support (5) is detachably connected to a support pile in the support pile layer (2), and two I-beams (8) in the same I-beam group are arranged in parallel on the plurality of I-beam supports (5) in the corresponding I-beam support group and are welded and fixed to the plurality of I-beam supports (5) in the corresponding I-beam support group.

2. A foundation pit support structure according to claim 1, characterized in that: The distance between the water-stop curtain layer (1) and the supporting pile layer (2) is greater than 1 meter.

3. A foundation pit support structure according to claim 2, characterized in that: The anchor cable assembly (4) is inserted in a direction of tilting downward along a horizontal line, and the insertion angle is 25° to 30°.

4. The foundation pit support structure according to claim 3, characterized in that: The anchor cable assembly (4) includes a guide cap (41), a fastening ring (42), a wire-hanging ring (43), a plurality of steel strands (44) and a plurality of corrugated pipes (45). An anchor cable inclined hole (10) is processed on the foundation of the target foundation pit. The anchoring sections and free sections of the plurality of steel strands (44) are inserted into the anchor cable inclined hole (10), and the axis of each steel strand (44) is arranged parallel to the axis of the anchor cable inclined hole (10). The anchoring sections of the plurality of steel strands (44) are sequentially covered with a wire-hanging ring (43), a fastening ring (42), a wire-hanging ring (43 ... 42) and a guide cap (41), and the guide cap (41) is mounted on the end of a plurality of steel strands (44), a bellows (45) is mounted on the free section of each steel strand (44), the tensioning and tightening section of each steel strand (44) extends to the outside of the anchor cable inclined hole (10) and to the inside of the supporting pile layer (2), the anchor cable inclined hole (10) is filled with a concrete paddle (11), and the plurality of steel strands (44) are anchored and connected to the anchor cable inclined hole (10) after the concrete paddle (11) solidifies.

5. The foundation pit supporting structure according to claim 4, characterized in that: The I-beam support (5) comprises a right-angled tripod (51), a support plate (52), a damping lifting rod (53), an upper hinged plate (54), an I-beam waist beam support plate (55) and a lower sliding hinged plate (56). The right-angled tripod (51) is arranged on the inner side of the support pile layer (2), and the vertical right-angled side plate in the right-angled tripod (51) is connected to the outer wall of the corresponding support pile by bolts. The horizontal right-angled side plate in the right-angled tripod (51) is located above the oblique side plate in the right-angled tripod (51), and the horizontal right-angled side plate in the right-angled tripod (51) is arranged perpendicular to the axis of the corresponding support pile. The support plate (52) is laid on the horizontal right-angled side plate in the right-angled tripod (51), and the support plate (52) is welded and fixed to the right-angled tripod (51). The damping lifting rod (53) is vertically erected on the support plate (52) near the support pile. The top of one end of the guard pile, and the bottom of the damping lifting rod (53) is fixedly connected to the support plate (52), the upper hinge plate (54) is fixed to the top of the damping lifting rod (53), the lower sliding hinge plate (56) is arranged on the top of the support plate (52), and the lower sliding hinge plate (56) is detachably connected to the support plate (52) by bolts, the I-beam waist support plate (55) is arranged between the upper hinge plate (54) and the lower sliding hinge plate (56), and one end of the I-beam waist support plate (55) is hinged to the upper hinge plate (54), and the other end of the I-beam waist support plate (55) is hinged to the lower sliding hinge plate (56), two I-beams (8) in the same I-beam group are arranged in parallel on the I-beam waist support plate (55), and each I-beam (8) is welded and fixed to the I-beam waist support plate (55).

6. The foundation pit supporting structure according to claim 5, characterized in that: The I-beam waist beam support plate (55) and the anchor cable assembly (4) are arranged vertically.

7. The foundation pit supporting structure according to claim 6, characterized in that: Two threaded holes are processed on the top of the support plate (52), and two strip holes are processed on the top of the lower sliding hinge plate (56) along the length extension direction of the support plate (52), and each strip hole is arranged corresponding to a threaded hole, and the threaded section of each bolt passes through a strip hole in sequence and is inserted into the corresponding threaded hole, and each bolt is threadedly detachably connected to the top of the support plate (52).

8. The foundation pit supporting structure according to claim 6, characterized in that: Two L-shaped positioning plates (551) are provided on one side of the I-beam waist beam support plate (55) for supporting the I-beam (8). The two L-shaped positioning plates (551) are arranged parallel to and opposite to each other along the center line of the length direction of the I-beam waist beam support plate (55), and each L-shaped positioning plate (551) is fixedly connected to the I-beam waist beam support plate (55).

9. The foundation pit supporting structure according to claim 8, characterized in that: The foundation pit support structure further comprises a plurality of auxiliary support units, each auxiliary support unit comprising a support rod (6) and a pre-buried cone assembly (7), the bottom of the hypotenuse plate in each right-angled tripod (51) is fixedly connected with a connecting plate (57), the pre-buried cone assembly (7) is located on the inner side of the supporting pile layer (2), and the pre-buried cone assembly (7) is arranged corresponding to a supporting pile, the bottom of the pre-buried cone assembly (7) is inserted into the foundation at the bottom of the foundation pit, the top of the pre-buried cone assembly (7) extends into the foundation pit, the support rod (6) is arranged between the pre-buried cone assembly (7) and any one of the I-beam brackets (5) on the corresponding supporting pile, and one end of the support rod (6) is detachably connected to the top of the pre-buried cone assembly (7), and the other end of the support rod (6) is detachably connected to the connecting plate (57) in the corresponding I-beam bracket (5).

10. The foundation pit supporting structure according to claim 9, characterized in that: The embedded cone assembly (7) comprises a mounting plate (71), an upper mounting block (73) and a plurality of embedded cones (72). The plurality of embedded cones (72) are vertically arranged at the bottom of the mounting plate (71), and the top end of each embedded cone (72) is fixedly connected to the mounting plate (71). The upper mounting block (73) is arranged at the top center of the mounting plate (71), and the bottom end of each upper mounting block (73) is fixedly connected to the mounting plate (71). The top end of the upper mounting block (73) is detachably connected to one end of the support rod (6).

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