An assembled support structure for a foundation pit and an assembly method thereof

Abstract

The present application relates to an assembled support structure of a foundation pit and an assembly method thereof, which belongs to the technical field of foundation pit support, and comprises a foundation pit body, a pile foundation support structure arranged on the inner side wall of the foundation pit body, and a support assembly arranged on the pile foundation support structure, wherein the pile foundation support structure is used to support the inner side wall of the foundation pit body, and the support assembly supports the pile foundation support structure to form a stable support structure around the foundation pit body. The present application has the effect of being able to support the retaining piles, thereby forming a stable support structure around the foundation pit body, preventing soil collapse and lateral displacement, and ensuring the stability of the foundation pit body.

Description

Technical Field

[0001] The present application relates to the technical field of foundation pit support, and in particular to an assembled support structure of a foundation pit and an assembly method thereof. Background Art

[0002] At present, foundation pit support refers to the engineering technology that takes a series of measures to support the foundation pit in order to ensure the stability of the soil around the foundation pit and the safety of construction during construction. Foundation pit support is usually used in underground buildings, underground garages, subway stations and other places that require a large excavation depth to prevent soil collapse, groundwater influx and other problems.

[0003] The conventional practice for existing foundation pit support structures is pile foundation support. First, a drilling rig is used to drill holes for the pile foundation. After the drilling is completed, the pile foundation grouting is carried out. Then, reinforced concrete grouting material is injected into the drilled hole to fill the pores and form a pile foundation support structure. Before the grouting material solidifies, pre-buried steel bars or steel cages are installed. After the grouting material is fully solidified, the pile foundation is solidified to form retaining piles. Multiple retaining piles arranged in parallel are used as the support structure of the foundation pit and are fixed in the soil around the foundation pit to enhance the stability of the soil.

[0004] With respect to the above-mentioned related technologies, the inventors believe that the following technical defects exist: when the foundation pit is used for underground buildings, underground garages, subway stations and other places that require a greater excavation depth, due to the large depth of the foundation pit, only a plurality of retaining piles arranged in parallel are used as the supporting structure of the foundation pit, and there is no supporting structure to support the retaining piles. This will result in the defect of insufficient stability of the foundation pit, and further improvements are needed. Summary of the invention

[0005] In order to support the retaining piles, thereby forming a stable support structure around the foundation pit body, preventing soil collapse and lateral displacement, and ensuring the stability of the foundation pit body, the present application provides an assembled support structure for a foundation pit and an assembly method thereof.

[0006] In the first aspect, the present application provides an assembled support structure for a foundation pit using the following technical solution:

[0007] An assembled support structure for a foundation pit comprises a foundation pit body, a pile foundation support structure arranged on the inner side wall of the foundation pit body and a support assembly arranged on the pile foundation support structure, wherein the pile foundation support structure is used to support the inner side wall of the foundation pit body, and the support assembly supports the pile foundation support structure to form a stable support structure around the foundation pit body.

[0008] By adopting the above technical solution, the support assembly supports the pile foundation support structure, thereby forming a stable support structure around the foundation pit body, preventing soil collapse and lateral displacement, and ensuring the stability of the foundation pit body.

[0009] Preferably, the support assembly includes a steel purlin detachably connected to the side of the pile foundation support structure, a corner support steel member detachably connected to the corner of the steel purlin, and a side support steel member detachably connected between the two inner sides of the steel purlin.

[0010] By adopting the above technical solution, the steel purlins, corner support steel parts and side support steel parts are assembled on the pile foundation support structure in sequence to support the pile foundation support structure, thereby forming a stable support structure around the foundation pit body.

[0011] Preferably, the steel perimeter purlin includes four steel purlins connected end to end, the side of the pile foundation support structure is detachably connected with a triangular bracket, the top surface of the triangular bracket supports the steel purlin, and the steel purlin and the pile foundation support structure are detachably connected via a locking piece.

[0012] By adopting the above technical solution, under the supporting action of the triangular bracket, the steel purlins connected end to end are enclosed on the side of the pile foundation supporting structure, thereby supporting the pile foundation supporting structure.

[0013] Preferably, the corner supporting steel parts include corner pads, connecting parts and angle braces which are sequentially arranged between two adjacent steel purlins, the angle braces include a first angle brace rod, a second angle brace rod and an angle brace compensation part detachably connected between the first angle brace rod and the second angle brace rod, the ends of the first angle brace rod and the second angle brace rod away from each other are detachably connected between two adjacent steel purlins through a connecting pad, a plurality of lattice columns are pre-embedded in the inner bottom wall of the foundation pit body and at the corners of the foundation pit body, the lattice column one is supported by a support beam one through a first bracket, and the support beam one is used to support the first angle brace rod.

[0014] By adopting the above technical solution, pads, connectors and angle braces are assembled between two adjacent steel purlins in sequence, and the angle brace compensation piece is activated so that the ends of the first angle brace and the second angle brace that are away from each other are supported between the two adjacent steel purlins, thereby achieving support for the adjacent steel purlins.

[0015] Preferably, the side supporting steel member includes a pair of braces whose opposite ends are respectively connected to the steel purlins on both sides of the foundation pit body and two S-shaped braces which are respectively detachably connected to the two ends of the pair of braces. A plurality of lattice columns 2 are pre-embedded in the inner bottom wall of the foundation pit body and located in the middle position of the foundation pit body. The lattice column 2 is supported by a supporting beam 2 through a second bracket. The supporting beam 2 is used to support the pair of braces. The end of the S-shaped brace away from the pair of braces is connected to the steel purlin on the side of the foundation pit body.

[0016] By adopting the above technical solution, the opposite ends of the support member are respectively connected to the steel purlins on both sides of the foundation pit body, and the S-shaped support is installed on the support member, thereby achieving support for the steel purlins on both sides of the foundation pit body.

[0017] Preferably, the support members include a first pair of support seats, a second pair of support seats, and support compensation members detachably connected between the first pair of support seats and the second pair of support seats, and the second support beam is used to support the first pair of support seats and the second pair of support seats, and the ends of the first pair of support seats and the second pair of support seats that are away from each other are respectively connected to the steel purlins on both sides of the foundation pit body.

[0018] By adopting the above technical solution, the ends of the first pair of supports and the second pair of supports that are away from each other are respectively connected to the steel purlins on both sides of the foundation pit body, and the support compensation parts are installed between the first pair of supports and the second pair of supports. The support compensation parts are started so that the ends of the first pair of supports and the second pair of supports that are away from each other support the steel purlins on both sides of the foundation pit body, thereby achieving support for the steel purlins on both sides of the foundation pit body.

[0019] Preferably, both ends of the support compensation member are fixedly connected with mounting plates, and mounting frames are installed on the sides of the two mounting plates away from each other. The first pair of support seats are detachably connected to the mounting frame through mounting components, and both ends of the bottom surface of the mounting plates are provided with ground support members.

[0020] By adopting the above technical solution, the arrangement of the installation assembly facilitates the installation of the support compensation member, and the support compensation member can be supported by the support of the ground support member.

[0021] Preferably, the mounting assembly includes a mounting block fixedly connected to the ends of the first pair of support seats, a movable plate that slides vertically inside the mounting block, and a locking rod that slides inside the mounting block and is clamped with the movable plate through a slot, the mounting block is provided with an elastic member 1 connected to the movable plate for resetting the movable plate, the mounting block is provided with an elastic member 2 for resetting the locking rod, and the movable plate is provided with a connecting port corresponding to the position of the locking rod.

[0022] By adopting the above technical solution, when it is necessary to lock the mounting block on the mounting frame, the movable plate is pulled downward until the connecting port of the movable plate is disengaged from the card slot. Under the resetting action of the elastic member 2, the end of the locking rod away from the movable plate sequentially penetrates the mounting block and the mounting frame and extends to the outside of the mounting frame, thereby locking the mounting frame through the locking rod.

[0023] Preferably, the ground supporting member includes a mounting seat fixedly connected to the end of the bottom surface of the mounting plate, a ground supporting rod rotatably connected to the mounting seat and foldable relative to the mounting seat, and a hinged rod connected between the mounting seat and the ground supporting rod, the hinged rod is slidingly connected to the ground supporting rod via a sliding hole, a limiting member for limiting the hinged rod is provided inside the ground supporting rod, and a lifting member is installed at the inner bottom of the ground supporting rod.

[0024] By adopting the above technical solution, under the limiting action of the limiting member, the ground supporting rod cannot be folded, so that the supporting compensating member is supported by the ground supporting rod.

[0025] In a second aspect, the present application provides a method for assembling an assembled support structure of a foundation pit, comprising the following steps:

[0026] S1: construct the pile foundation support structure at the predetermined location, and then carry out the first excavation;

[0027] S2: Construct steel purlins on the pile foundation support structure, construct corner support steel pieces at the corners of the steel purlins, and construct side support steel pieces between the two inner sides of the steel purlins to form a stable support structure around the foundation pit body;

[0028] S3: Carry out foundation slab construction on the inner bottom wall of the foundation pit body, and then carry out negative one-story structure construction;

[0029] S4: After the construction of the underground first floor structure is completed, the side support steel parts, corner support steel parts and steel purlins are removed in turn.

[0030] By adopting the above technical solution, the assembly of steel purlins, corner support steel parts and side support steel parts on the pile foundation support structure is realized, thereby forming a stable support structure around the foundation pit body.

[0031] In summary, the present application includes at least one of the following beneficial technical effects:

[0032] 1. The support assembly supports the pile foundation support structure, thereby forming a stable support structure around the foundation pit body, preventing soil collapse and lateral displacement, and ensuring the stability of the foundation pit body;

[0033] 2. The assembly of steel purlins, corner support steel parts and side support steel parts on the pile foundation support structure is realized, thereby forming a stable support structure around the foundation pit body. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall structure of this application.

[0035] Figure 2 yes Figure 1 A partial enlarged schematic diagram of part A.

[0036] Figure 3 yes Figure 1 A partial enlarged schematic diagram of part B.

[0037] Figure 4 It is a schematic diagram of the first pair of support rods, the support compensating member and the second pair of support rods of the present application.

[0038] Figure 5 yes Figure 4 A partial enlarged schematic diagram of part C in the middle.

[0039] Figure 6 yes Figure 4 A partial enlarged schematic diagram of part D in the middle.

[0040] Figure 7 It is a cross-sectional view of the first pair of support rods, the mounting block and the mounting frame of the present application.

[0041] Figure 8 yes Figure 7 A partial enlarged schematic diagram of part E in the middle.

[0042] Fig. 9 It is a schematic diagram of the ground supporting member and the limiting member of the present application.

[0043] Fig.10 It is a schematic diagram of the toggle block and the torsion spring of the present application.

[0044] Explanation of the reference numerals: 1. foundation pit body; 11. lattice column one; 111. first bracket; 112. joist one; 12. lattice column two; 121. second bracket; 122. joist two; 2. pile foundation support structure; 21. retaining pile; 211. triangular bracket; 212. upper steel ring; 22. concrete retaining wall; 23. crown beam; 3. steel purlin; 31. lower steel ring; 32. steel strand; 4. corner pad; 41. rod body; 42. end connection block; 43. first angle brace; 431. connection pad; 432. connection rod; 433. end connection plate; 44. second angle brace; 45. angle brace compensation piece; 5. side brace; 51. side connection block; 52. first pair of support seats; 521. A first pair of support rods; 522, a second reinforcement member; 53, a second pair of support seats; 531, a second pair of support rods; 532, a third reinforcement member; 54, a support compensation member; 541, a mounting plate; 542, a mounting frame; 55, a mounting block; 551, a sliding groove; 552, an elastic member one; 553, a receiving groove; 554, a limiting plate; 555, an elastic member two; 56, a moving plate; 561, a pulling rod; 562, a connecting port; 563, a placement groove; 57, a locking rod; 571, a slot; 6, a mounting seat; 61, a ground support rod; 611, a sliding hole; 62, a hinged rod; 621, a rotating shaft; 63, a connecting shaft; 64, a toggle block; 641, a mounting groove; 65, a torsion spring; 66, a ground support plate. DETAILED DESCRIPTION

[0045] The following is combined with Figure 1-10 This application is described in further detail.

[0046] The present application embodiment discloses an assembled support structure for a foundation pit. Figure 1 and Figure 2 The assembled support structure of the foundation pit includes a foundation pit body 1, a pile foundation support structure 2 arranged on the inner side wall of the foundation pit body 1 for supporting the inner side wall of the foundation pit body 1, and a support assembly arranged on the pile foundation support structure 2 for supporting the pile foundation support structure 2. The support assembly is arranged around the foundation pit body 1 to form a stable support structure to prevent soil collapse and lateral displacement, and ensure the stability of the foundation pit body 1.

[0047] The pile foundation support structure 2 includes a plurality of retaining piles 21 enclosing the inner wall of the foundation pit body 1 and a concrete retaining wall 22 cast on the inner wall of the foundation pit body 1 and located between adjacent retaining piles 21; a cap beam 23 is cast on the top of the plurality of retaining piles 21, and the cap beam 23 encloses the inner wall of the foundation pit body 1. The support assembly includes a steel purlin detachably connected to the side of the retaining pile 21, a corner support steel piece detachably connected to the corner of the steel purlin, and a side support steel piece detachably connected between the two inner sides of the steel purlin; four groups of corner support steel pieces are provided, and the four groups of corner support steel pieces are respectively provided at the four corners of the steel purlin; multiple groups of side support steel pieces are provided, and the multiple groups of side support steel pieces are evenly spaced and distributed along the length direction of the foundation pit body 1.

[0048] Reference Figure 1 and Figure 2 A triangular bracket 211 is detachably connected to the side of each guard pile 21 by bolts, and the steel guard purlin includes four steel purlins 3 connected end to end, and adjacent steel purlins 3 are detachably connected by bolts; the top surface of the triangular bracket 211 supports the steel purlin 3, and the steel purlin 3 and the guard pile 21 are detachably connected by locking pieces, and multiple groups of locking pieces are provided, and the multiple groups of locking pieces are evenly distributed.

[0049] Reference Figure 1 and Figure 2 The locking piece includes a lower steel ring 31 fixedly connected to the side of the steel purlin 3 away from the guard pile 21, an upper steel ring 212 pre-buried in the side of the guard pile 21 close to the steel purlin 3 and corresponding to the position of the lower steel ring 31, and a steel rope 32 hooked between the upper steel ring 212 and the lower steel ring 31.

[0050] Reference Figure 1 and Figure 2The corner support steel parts are arranged between two adjacent steel purlins 3, and the corner support steel parts include a corner pad 4, a connecting piece and a corner brace which are arranged in sequence between two adjacent steel purlins 3; the corner pad 4 is detachably connected to the corners of two adjacent steel purlins 3 by bolts; the connecting piece includes a rod body 41 and two end connecting blocks 42 which are respectively arranged at both ends of the rod body 41, the end connecting blocks 42 are detachably connected to the ends of the rod body 41 by bolts, and the ends of the two end connecting blocks 42 which are away from each other are detachably connected between two adjacent steel purlins 3, and the end connecting blocks 42 are detachably connected to the steel purlins 3 at the corresponding positions by bolts; the rod body 41 and the corner pad 4 are arranged at intervals.

[0051] Reference Figure 1 and Figure 2 A plurality of vertically arranged lattice columns 11 are pre-buried on the inner bottom wall of the foundation pit body 1 and at the corners of the foundation pit body 1. A first bracket 111 is arranged on the same side of the plurality of lattice columns 11. The first bracket 111 is detachably connected to the side of the lattice column 11 by bolts. A support beam 112 is commonly supported on the plurality of first brackets 111 located at the same corner of the foundation pit body 1. The support beam 112 is detachably connected to the first bracket 111 by bolts.

[0052] The angle braces are arranged at intervals on a side of the rod body 41 away from the corner pad 4 .

[0053] The angle brace includes a first angle brace 43, a second angle brace 44 and an angle brace compensation piece 45 detachably connected between the first angle brace 43 and the second angle brace 44; the top surface of the first bracket 111 supports the first angle brace 43, and the ends of the first angle brace 43 and the second angle brace 44 that are away from each other are detachably connected with a connecting pad 431, and the ends of the two connecting pads 431 that are away from each other are detachably connected between two adjacent steel purlins 3 by bolts.

[0054] In this embodiment, three groups of angle braces are provided on the same corner of the foundation pit body 1, and the three groups of angle braces are arranged parallel to each other; in order to enhance the stability between two adjacent groups of angle braces, two groups of first reinforcement members are connected between the two groups of angle braces with longer lengths, and the two groups of first reinforcement members are respectively connected between two adjacent first angle braces 43 and between two adjacent second angle braces 44.

[0055] Reference Figure 1 and Figure 2The first reinforcement member includes a connecting rod 432 and an end connecting plate 433. The connecting rod 432 is inserted between two adjacent first angle braces 43. Four end connecting plates 433 are provided on the same first reinforcement member, two of which are detachably connected to the two ends of the top surface of the connecting rod 432, and the other two end connecting plates 433 are detachably connected to the two ends of the bottom surface of the connecting rod 432; the end connecting plate 433 is detachably connected to the connecting rod 432 by bolts. The bottom surface of the end connecting plate 433 located on the top surface of the connecting rod 432 abuts against the top surface of the first angle brace 43, and the top surface of the end connecting plate 433 located on the bottom surface of the connecting rod 432 abuts against the bottom surface of the first angle brace 43; the end connecting plate 433 is detachably connected to the first angle brace 43 by bolts.

[0056] Reference Figure 2 and Figure 3 , a plurality of lattice columns 12 arranged parallel to each other are pre-buried in the inner bottom wall of the foundation pit body 1 and located in the middle position of the foundation pit body 1, the plurality of lattice columns 12 are grouped in pairs, and each group of lattice columns 12 is evenly spaced along the width direction of the foundation pit body 1; the same side of the plurality of lattice columns 12 is detachably connected with a second bracket 121 by bolts, and the two second brackets 121 on the same group of lattice columns 12 jointly support a joist 122, and the joist 122 is detachably connected to the second bracket 121 by bolts; the side supporting steel parts include a brace and two eight-shaped braces detachably connected to the two ends of the brace respectively; the top surface of the joist 122 supports the brace, and the opposite ends of the brace are respectively connected to the steel purlins 3 on the two sides of the foundation pit body 1; the end of the eight-shaped brace away from the brace is connected to the steel purlin 3 on the side of the foundation pit body 1.

[0057] Reference Figure 2 and Figure 3 The eight-shaped brace includes two side brace rods 5 symmetrically arranged at the two side ends of the brace member and a side connecting block 51 detachably connected to the end of each side brace rod 5; the side connecting block 51 is detachably connected to the side brace rod 5 by bolts, and the ends of the two side connecting blocks 51 away from each other are respectively connected to the brace member and the steel purlin 3 on the side of the foundation pit body 1, and the side connecting block 51 is detachably connected to the steel purlin 3 on the side of the foundation pit body 1 by bolts; the setting of the eight-shaped brace improves the stability of the connection between the brace member and the steel purlin 3 on the side of the foundation pit body 1.

[0058] Reference Figure 2 and Figure 3The supporting member includes a first pair of supporting seats 52, a second pair of supporting seats 53, and a supporting compensation member 54 detachably connected between the first pair of supporting seats 52 and the second pair of supporting seats 53; the first pair of supporting seats 52 includes two mutually parallel first pairs of supporting rods 521 and a plurality of second reinforcing members 522 detachably connected between the two first pairs of supporting rods 521; the plurality of second reinforcing members 522 are evenly spaced along the length direction of the first pair of supporting rods 521. The second pair of supporting seats 53 includes two mutually parallel second pairs of supporting rods 531 and a plurality of third reinforcing members 532 detachably connected between the two second pairs of supporting rods 531; two supporting compensation members 54 are provided, and the supporting compensation members 54 are detachably connected between the first pair of supporting rods 521 and the second pair of supporting rods 531 at corresponding positions.

[0059] It should be noted that, in this embodiment, the structures and installation methods of the first reinforcement member, the second reinforcement member 522 and the third reinforcement member 532 are consistent, so they are not described in detail.

[0060] Reference Figure 2 and Figure 3 The second support beam 122 is used to support the first pair of support rods 521 and the second pair of support rods 531, so that the first pair of support rods 521 and the second pair of support rods 531 are located on the same horizontal plane. The first pair of support rods 521 are detachably connected to the corresponding side connection blocks 51 by bolts, and the second pair of support rods 531 are detachably connected to the corresponding side connection blocks 51 by bolts; the ends of the first pair of support rods 521 and the second pair of support rods 531 that are away from each other are respectively connected to the steel purlins 3 on both sides of the foundation pit body 1, and the first pair of support rods 521 and the second pair of support rods 531 are detachably connected to the steel purlins 3 on the sides of the foundation pit body 1 by bolts.

[0061] In this embodiment, both the angle brace compensating member 45 and the opposite brace compensating member 54 are jacks. Since the installation method of the angle brace compensating member 45 between the first angle brace rod 43 and the second angle brace rod 44 is the same as the installation method of the opposite brace compensating member 54 between the first pair of brace rods 521 and the second pair of brace rods 531, in this embodiment, the installation method of the opposite brace compensating member 54 between the first pair of brace rods 521 and the second pair of brace rods 531 is taken as an example for explanation.

[0062] Reference Figure 4-6, both ends of the support compensation member 54 are fixedly connected with a mounting plate 541, and a mounting frame 542 is installed on the side of the two mounting plates 541 that are away from each other, and the two mounting frames 542 are respectively plugged into and matched with the ends of the first pair of support rods 521 and the second pair of support rods 531 that are close to each other; the first pair of support rods 521 and the second pair of support rods 531 are both detachably connected to the mounting frame 542 through mounting components, and there are two groups of mounting components on the first pair of support rods 521 and the second pair of support rods 531, and the two groups of mounting components on the first pair of support rods 521 are symmetrically arranged on both sides of the first pair of support rods 521, and the two groups of mounting components on the second pair of support rods 531 are symmetrically arranged on both sides of the second pair of support rods 531.

[0063] Reference Figure 7 and Figure 8 The mounting assembly includes a mounting block 55 fixedly connected to one side of the end of the first pair of support rods 521, a movable plate 56 that slides vertically inside the mounting block 55, and a locking rod 57 that slides inside the mounting block 55 and is connected to the movable plate 56; a vertical sliding groove 551 is opened inside the mounting block 55, and the movable plate 56 is slidably connected in the sliding groove 551, and an elastic member 552 is fixedly connected to the inner top wall of the sliding groove 551, and the bottom end of the elastic member 552 is fixedly connected to the top surface of the movable plate 56; a vertically arranged pull rod 561 is fixedly connected to the bottom surface of the movable plate 56, and the end of the pull rod 561 away from the movable plate 56 passes through the first pair of support rods 521 and the mounting frame 542 in sequence and extends to the outside of the mounting frame 542. In the process of inserting the first pair of support rods 521 into the installation frame 542 , in order to allow the pull rod 561 to slide smoothly into the installation frame 542 , a clearance opening corresponding to the position of the pull rod 561 is opened on the bottom surface of the installation frame 542 .

[0064] Reference Figure 7 and Figure 8 The mounting block 55 has a receiving groove 553 formed inside, and a limiting plate 554 is slidably connected in the receiving groove 553. The locking rod 57 is fixedly passed through the limiting plate 554, and a second elastic member 555 located in the receiving groove 553 is sleeved on the locking rod 57. One end of the second elastic member 555 is fixedly connected to a side of the limiting plate 554 close to the moving plate 56, and one end of the second elastic member 555 away from the limiting plate 554 is fixedly connected to the inner wall of the receiving groove 553. The sliding direction of the locking rod 57 is perpendicular to the sliding direction of the moving plate 56, and the locking rod 57 is located on a side of the moving plate 56 close to the mounting frame 542; the end of the locking rod 57 away from the moving plate 56 passes through the mounting block 55 and the mounting frame 542 in sequence and extends to the outside of the mounting frame 542.

[0065] Reference Figure 7 and Figure 8The movable plate 56 is provided with a connecting port 562 corresponding to the position of the locking rod 57, and the connecting port 562 of the movable plate 56 is provided with a chamfer matching the locking rod 57, and the side of the sliding groove 551 away from the locking rod 57 is provided with a placement groove 563 corresponding to the position of the locking rod 57; and a clamping groove 571 is provided on the peripheral side of the locking rod 57. Thus, the locking rod 57 is pushed toward the movable plate 56, so that the end of the locking rod 57 close to the movable plate 56 abuts against the chamfer, so that the locking rod 57 pushes the movable plate 56 to move downward until the connecting port 562 and the placement groove 563 are connected, and the end of the locking rod 57 close to the movable plate 56 passes through the connecting port 562 and extends into the placement groove 563, and the pull rod 561 is released. Under the reset action of the elastic member 1 552, the connecting port 562 of the movable plate 56 is clamped in the clamping groove 571 of the locking rod 57, so that the locking rod 57 is locked in the mounting block 55.

[0066] When it is necessary to lock the mounting block 55 on the mounting frame 542, pull the pull rod 561 downward, and the pull rod 561 drives the movable plate 56 to move downward until the connecting port 562 is connected to the placement groove 563. At this time, the connecting port 562 of the movable plate 56 is disengaged from the card slot 571, and under the resetting action of the elastic member 555, the end of the locking rod 57 away from the movable plate 56 passes through the mounting block 55 and the mounting frame 542 in turn and extends to the outside of the mounting frame 542, so that the mounting frame 542 is locked by the locking rod 57.

[0067] Reference Figure 6 and Fig. 9 In order to enable the supporting compensation member 54 to support the ground, thereby facilitating the installation of the supporting compensation member 54, supporting members are provided at both ends of the bottom surface of the mounting plate 541, and the supporting members include a mounting seat 6 fixedly connected to the end of the bottom surface of the mounting plate 541, a supporting rod 61 rotatably connected to the mounting seat 6 and foldable relative to the mounting seat 6, and a hinged rod 62 connected between the mounting seat 6 and the supporting rod 61; the cross-sections of the mounting seat 6 and the supporting rod 61 are both U-shaped, and the top end of the supporting rod 61 extends into the mounting seat 6 along the lower opening of the mounting seat 6, the top end of the supporting rod 61 is hinged at the end of the mounting seat 6, and when the supporting rod 61 supports the ground, an L-shaped structure is formed between the supporting rod 61 and the mounting seat 6. There are two hinged rods 62, which are symmetrically arranged on both sides of the mounting seat 6. The top ends of the two hinged rods 62 are respectively hinged on both sides of the mounting seat 6, and the bottom ends of the two hinged rods 62 are rotatably connected to the same rotating shaft 621. Vertical sliding holes 611 are opened on both sides of the supporting rod 61, and the rotating shaft 621 is slidably connected to the sliding holes 611.

[0068] Reference Fig. 9 and Fig.10A limiting member for limiting the rotating shaft 621 is provided in the ground supporting rod 61; the limiting member includes a connecting shaft 63 fixedly connected between the two inner side walls of the ground supporting rod 61, a toggle block 64 rotatably connected to the connecting shaft 63, and a torsion spring 65 connected between the connecting shaft 63 and the toggle block 64; a mounting groove 641 is provided inside the toggle block 64, and the torsion spring 65 is located in the mounting groove 641, one end of the torsion spring 65 is fixedly connected to the connecting shaft 63, and the end of the torsion spring 65 away from the connecting shaft 63 is fixedly connected to the bottom of the inner wall of the mounting groove 641. In the initial state, the top of the toggle block 64 abuts against the inner wall of the ground support rod 61, and the top of the toggle block 64 abuts against the circumferential side of the rotating shaft 621, so that the rotating shaft 621 is limited by the toggle block 64; and the top of the toggle block 64 is provided with a rounded corner, and the bottom end of the toggle block 64 is toggled downward, and the toggle block 64 rotates with the connecting shaft 63 as the center, so that the top of the toggle block 64 can flip in the direction away from the ground support rod 61. At this time, the rounded corner of the top of the toggle block 64 presses against the rotating shaft 621 and moves upward along the top of the sliding hole 611, so that the top of the toggle block 64 can flip, thereby releasing the limitation of the rotating shaft 621, and the rotating shaft 621 can move downward along the bottom of the sliding hole 611; after releasing the toggle block 64, the top of the toggle block 64 can be reset under the reset action of the torsion spring 65.

[0069] Reference Fig. 9 and Fig.10 In order to enable the ground supporting rod 61 to be retractable, a lifting member is installed at the inner bottom of the ground supporting rod 61. In this embodiment, the lifting member is an electric telescopic rod with its own power supply. The telescopic end of the electric telescopic rod is set downward, and the telescopic end of the electric telescopic rod is fixedly connected to the ground supporting plate 66.

[0070] The implementation principle of the assembled support structure of the foundation pit in the embodiment of the present application is as follows: under the supporting action of the triangular bracket 211, four steel purlins 3 are sequentially assembled end to end on the side of the retaining pile 21, and the two ends of the steel strand 32 are respectively hooked with the upper steel ring 212 and the lower steel ring 31, so that the four end-to-end connected steel purlins 3 are assembled on the side of the retaining pile 21, and the corner pads 4, the connecting pieces and the angle bracing pieces are sequentially assembled between two adjacent steel purlins 3; the angle bracing compensation piece 45 is started, The ends of the first angle brace 43 and the second angle brace 44 that are away from each other are supported between two adjacent steel purlins 3, thereby supporting the adjacent steel purlins 3; the opposite ends of the support member are respectively connected to the steel purlins 3 on both sides of the foundation pit body 1, and the S-shaped support is installed on the support member, and the support compensation member 54 is activated, so that the ends of the first pair of support seats 52 and the second pair of support seats 53 that are away from each other support the steel purlins 3 on both sides of the foundation pit body 1, thereby supporting the steel purlins 3 on both sides of the foundation pit body 1.

[0071] The embodiment of the present application also discloses a method for assembling an assembled support structure of a foundation pit, comprising the following steps:

[0072] S1: construct the pile foundation support structure 2 at the predetermined location, and then carry out the first excavation;

[0073] S2: construct steel purlins on the pile foundation support structure 2, construct corner support steel pieces at the corners of the steel purlins, and construct side support steel pieces between the two inner sides of the steel purlins to form a stable support structure around the foundation pit body 1;

[0074] S3: constructing the foundation slab on the inner bottom wall of the foundation pit body 1, and then constructing the negative first floor structure;

[0075] S4: After the construction of the underground first floor structure is completed, the side support steel members, the corner support steel members and the steel purlin are removed in turn, and then the lattice column 1 11 and the lattice column 2 12 are cut so that the lattice column 1 11 and the lattice column 2 12 are flush with the foundation bottom plate.

[0076] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An assembled support structure for a foundation pit, characterized in that: It comprises a foundation pit body (1), a pile foundation support structure (2) arranged on the inner side wall of the foundation pit body (1), and a support assembly arranged on the pile foundation support structure (2), wherein the pile foundation support structure (2) is used to support the inner side wall of the foundation pit body (1), and the support assembly supports the pile foundation support structure (2) so that a stable support structure is formed around the foundation pit body (1); The support assembly comprises a steel purlin detachably connected to the side of the pile foundation support structure (2), a corner support steel piece detachably connected to the corner of the steel purlin, and a side support steel piece detachably connected between the two inner sides of the steel purlin; The steel perimeter purlin comprises four steel purlins (3) connected end to end, a triangular bracket (211) is detachably connected to the side of the pile foundation support structure (2), the top surface of the triangular bracket (211) supports the steel purlin (3), and the steel purlin (3) and the pile foundation support structure (2) are detachably connected via a locking piece; The side support steel member comprises a pair of support members whose opposite ends are respectively connected to the steel purlins (3) on both sides of the foundation pit body (1) and two eight-shaped supports respectively detachably connected to the two ends of the pair of support members, a plurality of lattice columns (12) are pre-buried in the inner bottom wall of the foundation pit body (1) and located in the middle of the foundation pit body (1), the lattice column (12) is supported by a second support beam (122) through a second bracket (121), the second support beam (122) is used to support the pair of support members, and the eight-shaped support is connected to the steel purlin (3) on the side of the foundation pit body (1) at one end away from the pair of support members; The supporting member comprises a first pair of supporting seats (52), a second pair of supporting seats (53) and a supporting compensation member (54) detachably connected between the first pair of supporting seats (52) and the second pair of supporting seats (53); the second support beam (122) is used to support the first pair of supporting seats (52) and the second pair of supporting seats (53); the ends of the first pair of supporting seats (52) and the second pair of supporting seats (53) which are away from each other are respectively connected to the steel purlins (3) on both sides of the foundation pit body (1); Both ends of the supporting compensation member (54) are fixedly connected with a mounting plate (541), and a mounting frame (542) is installed on the side of the two mounting plates (541) that are away from each other, the first pair of supporting seats (52) is detachably connected to the mounting frame (542) through a mounting assembly, and the second pair of supporting seats (53) is detachably connected to the mounting frame (542) through a mounting assembly, and both ends of the bottom surface of the mounting plate (541) are provided with a ground supporting member; The ground supporting member comprises a mounting seat (6) fixedly connected to the end of the bottom surface of the mounting plate (541), a ground supporting rod (61) rotatably connected to the mounting seat (6) and capable of being folded relative to the mounting seat (6), and a hinged rod (62) connected between the mounting seat (6) and the ground supporting rod (61); the hinged rod (62) is slidably connected to the ground supporting rod (61) via a sliding hole (611); a limiting member for limiting the hinged rod (62) is arranged inside the ground supporting rod (61); and a lifting member is installed at the inner bottom of the ground supporting rod (61).

2. The assembled support structure for a foundation pit according to claim 1, characterized in that: The corner support steel member comprises a corner pad (4), a connecting member and a corner support member which are sequentially arranged between two adjacent steel purlins (3); the corner support member comprises a first corner support rod (43), a second corner support rod (44) and a corner support compensation member (45) which is detachably connected between the first corner support rod (43) and the second corner support rod (44); the ends of the first corner support rod (43) and the second corner support rod (44) which are away from each other are detachably connected between the two adjacent steel purlins (3) through a connecting pad (431); a plurality of lattice columns (11) are pre-buried in the inner bottom wall of the foundation pit body (1) and at the corners of the foundation pit body (1); the lattice column (11) is supported by a support beam (112) through a first bracket (111); the support beam (112) is used to support the first corner support rod (43).

3. The assembled support structure of a foundation pit according to claim 1, characterized in that: The mounting assembly comprises a mounting block (55) fixedly connected to the ends of the first pair of support seats (52), a movable plate (56) vertically sliding inside the mounting block (55), and a locking rod (57) sliding inside the mounting block (55) and engaging with the movable plate (56) through a locking groove (571); an elastic member (552) connected to the movable plate (56) for resetting the movable plate (56) is arranged inside the mounting block (55); an elastic member (555) for resetting the locking rod (57) is arranged inside the mounting block (55); and a connecting opening (562) corresponding to the position of the locking rod (57) is opened on the movable plate (56).

4. The method for assembling a prefabricated support structure for a foundation pit according to any one of claims 2-3, characterized in that: The following steps are involved: S1: constructing a pile foundation support structure (2) at a predetermined location, and then carrying out the first excavation; S2: constructing steel purlins on the pile foundation support structure (2), constructing corner support steel pieces at the corners of the steel purlins, and constructing side support steel pieces between the two inner sides of the steel purlins to form a stable support structure around the foundation pit body (1); S3: constructing the foundation slab on the inner bottom wall of the foundation pit body (1), and then constructing the structure of the first floor below ground; S4: After the construction of the underground first floor structure is completed, the side support steel parts, corner support steel parts and steel purlins are removed in turn.

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