Multi-row pile foundation pit support structure and its construction method

Abstract

This application relates to a multi-row pile foundation pit support structure and its construction method, belonging to the technical field of geotechnical engineering. The multi-row pile foundation pit support structure includes a foundation pit body. An installation frame is arranged along the circumferential direction on the inner wall of the foundation pit body. The installation frame is provided with installation holes penetrating in the thickness direction. Each installation hole is inserted with a pipe pile, and the pipe pile passes through the installation hole and is inserted into the bottom wall of the foundation pit body; two gravity cones are arranged on the bottom wall of the installation frame. A signal transmitter is arranged on one of the gravity cones, and a signal receiver is arranged on the other gravity cone. The signal receiver is used to receive the signal emitted by the signal transmitter when it is in the same plane as the signal transmitter; the signal receiver is electrically connected to an indication module. This application has the effect of simplifying the installation process of the pipe pile by setting the installation frame, reducing the probability of the pipe pile being inclined, thereby improving the support effect and safety of the support structure for the foundation pit body, and improving the installation efficiency of the support structure.

Description

Technical Field

[0001] This application relates to the technical field of geotechnical engineering, and particularly relates to a multi-row pile foundation pit support structure and a construction method thereof. Background Art

[0002] Foundation pit support is a support, reinforcement and protection measure for the side wall of the foundation pit and the surrounding environment to protect the safety of underground structure construction and the surrounding environment of the foundation pit.

[0003] In the related art, there is designed a deep foundation pit support structure, which includes a cofferdam structure composed of a number of pipe piles. The cofferdam structure abuts against the inner wall of the foundation pit body, and a spike portion is provided at the bottom wall of each pipe pile, and the spike portion is inserted into the bottom wall of the foundation pit body. The inner wall of the foundation pit body is supported by the pipe piles, thereby improving the safety of the foundation pit and the surrounding environment.

[0004] In view of the above related art, the inventor found that when installing the support structure, it is necessary to drive the pipe piles one by one. However, during the driving process, the pipe piles are prone to tilt, resulting in the inability of the pipe piles to effectively support the inner wall of the foundation pit body, bringing potential safety hazards to the foundation pit and requiring re-construction. This process takes a long time and reduces the construction efficiency, so it needs to be improved. Summary of the Invention

[0005] In order to improve the problem that the pipe piles are prone to tilt during the driving process, this application provides a multi-row pile foundation pit support structure and a construction method thereof.

[0006] In a first aspect, the multi-row pile foundation pit support structure provided by this application adopts the following technical solution:

[0007] A multi-row pile foundation pit support structure includes a foundation pit body. An installation frame is arranged along the circumferential direction on the inner wall of the foundation pit body. The installation frame is provided with installation holes penetrating in the thickness direction. Each installation hole is inserted with a pipe pile, and the pipe pile passes through the installation hole and is inserted into the bottom wall of the foundation pit body;

[0008] Two gravity cones are arranged at the bottom wall of the installation frame. A signal transmitter is arranged on one of the gravity cones, and a signal receiver is arranged on the other gravity cone. The signal receiver is used to receive the signal emitted by the signal transmitter when it is in the same plane as the signal transmitter;

[0009] The signal receiver is electrically connected to an indication module. If the signal receiver receives the signal, the indication module indicates that the installation frame is in a horizontal state;

[0010] Otherwise, it is not in a horizontal state.

[0011] By adopting the above technical solution, an installation frame is arranged on the inner wall of the foundation pit body. After the installation frame is set up, if the installation holes of the installation frame are in a horizontal state, the signal receiver can receive the signal from the signal transmitter, and then prompt the staff through the indication module that the installation frame has been installed in place. Thus, the staff can directly pass the pipe pile through the installation hole and connect it to the bottom wall of the foundation pit body. At this time, the pipe pile abuts against the inner wall of the installation hole, which can ensure that the pipe pile is in a vertical state, thereby reducing the probability of the pipe pile tilting during the process of driving the pile, enabling the support structure to provide stable support for the inner wall of the foundation pit body and improving the safety of the support structure. At the same time, the presence of the installation frame can save the time for adjusting the pipe pile. By only judging whether the installation frame is installed in place, the vertical driving of the pipe pile can be completed, effectively saving the assembly time of the support structure and helping to improve the construction efficiency.

[0012] Preferably, the installation frame includes a plurality of installation rods and a plurality of installation cross beams. The installation rods are arranged vertically. An installation frame for inserting the installation cross beams on both sides is arranged on the side wall of the installation rod. The side wall of the installation frame abuts against the inner wall of the foundation pit body. The installation cross beam includes a plurality of mutually spliced installation blocks. The installation blocks abut against the inner wall of the foundation pit body. The installation holes are opened on the installation blocks. A fixing member for connection is arranged between adjacent installation blocks.

[0013] By adopting the above technical solution, the installation frame is divided into installation rods and installation blocks for assembly, making the whole more flexible, facilitating transportation and installation, and reducing the difficulty of transportation and assembly. At the same time, during construction, the appropriate number of installation rods and installation cross beams can be flexibly selected according to the sizes of different foundation pit bodies, effectively improving the applicability of the installation frame of the present application.

[0014] Preferably, a plug rod is arranged on the side wall of the installation frame facing the foundation pit body, and the plug rod is inserted into the inner wall of the foundation pit body. A support ring groove is opened in the circumferential direction on the side wall of the installation rod. A fixing block is slidably connected in the support ring groove. A locking member for fixing the fixing block to the installation rod is arranged on the side wall of the fixing block. A support rod is hinged to the side wall of the fixing block. An extension tube is sleeved on the outer wall of the end of the support rod away from the fixing block. The extension tube is detachably connected to the support rod. A fixing rod is hinged to the end of the extension tube away from the support rod, and the fixing rod is inserted into the bottom wall of the foundation pit body.

[0015] By adopting the above technical solution, inserting rods are arranged on the side wall of the installation frame, which can effectively improve the connection stability between the installation frame and the inner wall of the foundation pit body; after the installation rod is positioned, rotate the fixing block so that the fixing block can be rotated to an appropriate angle. At this time, by adjusting the relative positions of the support rod, the extension pipe and the fixing rod, a support between the bottom wall of the foundation pit body can be formed, thereby improving the installation stability of the installation rod, enabling the subsequent assembled installation frame to also have stronger stability, stably supporting the inner wall of the foundation pit body, and thus improving safety.

[0016] Preferably, the installation frame includes two separated frames, both of the separated frames are rotatably connected to the installation rod, abutting plates are arranged in both of the separated frames, the installation block of the installation cross beam is inserted into the installation frame and connected to the abutting plate, and a limiting component for fixing the separated frames is arranged on the installation rod.

[0017] By adopting the above technical solution, the installation frame is set as a rotatable separated frame, so that when the installation rod is applied to different types of foundation pit bodies, it can be adjusted more flexibly. The corner angles of different foundation pit bodies are different. When the separated frame can rotate, it can be made to fit the inner wall of the foundation pit body. When assembling the installation cross beam, it can also make the installation cross beam fit the inner wall of the foundation pit body, thereby improving the stability and flexibility of the installation frame; at the same time, by setting the limiting component, the adjustment angle of the separated frame can be fixed, improving the problem that when assembling the installation cross beam, the separated frame rotates in the reverse direction, resulting in the overall collapse of the installation frame and bringing potential safety hazards.

[0018] Preferably, the limiting component includes a fixed pipe, two rotating arc cylinders, a pull rod, two ratchet claws, two resetting components and two groups of ratchet tooth groups, and the separated frame, the rotating arc cylinder, the ratchet claw, the resetting component and the ratchet tooth group correspond one by one; the fixed pipe is vertically connected to the top wall of the installation rod, both of the rotating protection cylinders are sleeved on the outer wall of the fixed pipe and rotatably connected to the fixed pipe, the separated frame is connected to the outer wall of the corresponding rotating arc cylinder, the pull rod is slidably connected in the fixed pipe, both of the ratchet claws are hinged to the side wall of the pull rod, the resetting component is connected to the corresponding ratchet claw, the resetting component drives the ratchet claw to rotate and then reset, the ratchet tooth group is connected to the inner wall of the corresponding rotating arc cylinder, the ratchet tooth group is arranged along the circumferential direction of the inner wall of the rotating arc cylinder, a disassembly groove for the ratchet claw to pass through and slide is formed on the side wall of the fixed pipe, the ratchet claw passes through the disassembly groove and is clamped with the corresponding ratchet tooth group, and the ratchet claw and the ratchet tooth group are used to make the two separated frames only rotate in the direction away from each other.

[0019] By adopting the above technical solution, while the separation frame is rotating, the rotating arc tube will also rotate with the separation frame. At this time, due to the presence of the pawl and the ratchet group, the two separation frames can only rotate in directions away from each other and cannot be reversed. When the separation frame is rotated to fit with the inner wall of the foundation pit body, the separation frame cannot continue to rotate. At this time, the rotation of the separation frame in both directions is restricted, so the rotation angle can be fixed, making the assembly of the installation beam more stable; when an error occurs in the installation of the installation rod and the separation frame needs to be reset, it is only necessary to pull the pull rod. Driven by the pull rod, the pawl will slide along the length direction of the disassembly groove, thereby separating the pawl from the ratchet group. At this time, the separation frame can be reset, which is highly convenient and practical.

[0020] Preferably, each of the separation frames is provided with a connecting rod on the bottom wall, and the end of the connecting rod facing away from the separation frame is connected to a driven frame, and the driven frame is used to fix the mounting beams. The two groups of mounting beams are arranged along the depth direction of the foundation pit body, and a fixed anchor rod for positioning is arranged between the two groups of mounting beams.

[0021] By adopting the above technical solution and setting a driven frame, another set of mounting beams can be set up. Under the action of the fixed anchor rods, the mounting holes of the upper and lower sets of mounting beams are in a coaxial state. At this time, the installation of the pipe piles can further reduce the probability of tilting, thereby improving the safety of the support structure and the construction efficiency.

[0022] Preferably, a side of the mounting block facing the inner wall of the foundation pit body is provided with supporting fins, and the supporting fins are inserted into the inner wall of the foundation pit body.

[0023] By adopting the above technical solution, if the inner wall of the foundation pit body is longer, the length of the installation beam will also increase accordingly. At this time, it will bring greater pressure to the installation beam and the fixings used to connect the installation blocks, and there is a possibility of breakage. By providing support fins to form a connection with the inner wall of the foundation pit body, the pressure on the installation beam and the fixings can be effectively reduced, thereby improving the safety of the support structure of the present application.

[0024] Preferably, the mounting frame also includes a plurality of connecting beams, and the end walls at both ends of the connecting beams are hingedly connected with mounting columns. The side wall of the mounting block facing away from the foundation pit body is provided with a mounting groove for inserting the mounting column. The surrounding wall of the mounting column is provided with a mounting plate, and the mounting plate is abutted against the side wall of the mounting block. The connecting beams are used to connect the mounting beams on both sides of the mounting rod.

[0025] By adopting the above technical solution, a connecting cross beam is arranged to connect the mounting cross beams on both sides of the mounting rod, so that the mounting cross beams on both sides of the mounting rod can be kept relatively stable, the risk of the structure falling apart is reduced, and the safety of the supporting structure of the present application is further improved.

[0026] Preferably, a plurality of clamping grooves are formed in the inner wall of the mounting hole, the plurality of clamping grooves are uniformly distributed along the circumferential direction of the inner wall of the mounting hole, a plurality of fitting pieces are arranged in the mounting hole corresponding to the clamping grooves, a clamping block is arranged on the side wall of the fitting piece, the clamping block is inserted into the corresponding clamping groove, and the fitting piece fits against the outer wall of the pipe pile.

[0027] By adopting the above technical solution, since there are various types of pipe piles and different types of pipe piles cannot be adapted to the inner wall of the mounting hole, the diameter of the mounting hole can be flexibly adjusted by arranging the fitting pieces, so that the mounting frame can be applied to the positioning and installation of pipe piles of different sizes, and the practicability and flexibility of the supporting structure of the present application are improved.

[0028] In a second aspect, the present application also provides a construction method for a multi-row pile foundation pit supporting structure, including the following steps:

[0029] Select an appropriate number of mounting rods according to the number of corners of the foundation pit body;

[0030] Fix the mounting rod at the corner of the foundation pit body, observe the indication module, and check whether the mounting of the mounting rod is inclined. If it is inclined, re-fix the mounting rod;

[0031] If it is not inclined, rotate the separation frame so that the separation frame fits against the inner wall of the foundation pit body;

[0032] Assemble the mounting cross beams in the separation frame in sequence, and fix the adjacent mounting blocks through the fixing parts;

[0033] Assemble the mounting cross beams in the driven frame in sequence, fix the adjacent mounting blocks through the fixing parts, and connect the upper and lower mounting cross beams through the fixing anchor rods so that the mounting holes of the upper and lower mounting cross beams can be kept coaxial;

[0034] Install fitting pieces with appropriate sizes in the mounting holes according to the diameter of the pipe piles. After the installation is completed, pass the pipe piles through the mounting holes in sequence and fix them to the foundation pit body.

[0035] In summary, the present application includes at least one of the following beneficial technical effects:

[0036] 1. An installation frame is provided on the inner wall of the foundation pit body. After the installation frame is set up, if the installation holes of the installation frame are in a horizontal state, the signal receiver can receive the signal from the signal transmitter, and then prompt the staff through the indication module that the installation frame has been installed in place. Thus, the staff can directly pass the pipe pile through the installation hole and connect it to the bottom wall of the foundation pit body. At this time, the pipe pile abuts against the inner wall of the installation hole, which can ensure that the pipe pile is in a vertical state, thereby reducing the probability of the pipe pile tilting during the pile driving process, enabling the support structure to provide stable support for the inner wall of the foundation pit body, and improving the safety of the support structure.

[0037] 2. The installation frame is divided into installation rods and installation blocks for assembly, making the whole more flexible, facilitating transportation and installation, and reducing the difficulty of transportation and assembly. At the same time, during construction, the appropriate number of installation rods and installation crossbeams can be flexibly selected according to the sizes of different foundation pit bodies, effectively improving the applicability of the installation frame of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a schematic structural diagram of a multi-row pile foundation pit support structure according to an embodiment of the present application.

[0039] Figure 2 is a schematic structural diagram of the support structure according to an embodiment of the present application.

[0040] Figure 3 is Figure 2 a partial enlarged view of A in

[0041] Figure 4 is a schematic structural diagram of the installation frame according to an embodiment of the present application.

[0042] Figure 5 is a schematic structural diagram of the limiting component according to an embodiment of the present application.

[0043] Figure 6 is Figure 4 a partial enlarged view of B in

[0044] Figure 7 is Figure 1 a partial enlarged view of C in

[0045] Description of reference numerals: 1, foundation pit body; 2, mounting frame; 21, mounting rod; 211, support ring groove; 212, fixing block; 213, locking member; 214, support rod; 215, extension tube; 216, fixing rod; 22, mounting cross beam; 221, mounting block; 2211, mounting hole; 2212, support fin; 2213, mounting groove; 2214, clamping groove; 23, mounting frame; 231, separating frame; 2311, abutting plate; 2312, connecting rod; 232, inserting rod; 24, fixing member; 25, connecting cross beam; 251, mounting column; 252, mounting plate; 3, pipe pile; 4, gravity cone; 41, signal transmitter; 42, signal receiver; 43, indicating module; 5, limiting component; 51, fixing pipe; 511, dismounting groove; 52, rotating arc cylinder; 53, pulling rod; 54, ratchet; 55, resetting member; 56, ratchet tooth group; 6, driven frame; 61, fixing anchor rod; 7, attaching piece; 71, clamping block. Detailed implementation manners

[0046] The following further elaborates on this application in conjunction with the attached Figure 1-7 drawings.

[0047] The embodiment of this application discloses a multi - row pile foundation pit support structure. Refer to Figure 1 and Figure 2 , which includes a foundation pit body 1. An installation frame 2 is arranged inside the foundation pit body 1. The installation frame 2 includes a plurality of installation rods 21, a plurality of installation cross beams 22 and a plurality of connecting cross beams 25. In this embodiment, taking 6 corners of the foundation pit body 1 as an example, a total of 6 installation rods 21 are provided.

[0048] Refer to Figure 1 and Figure 3 , the installation rods 21 are vertically arranged at the corners of the foundation pit body 1, and one end of the installation rod 21 is inserted into the bottom wall of the foundation pit body 1; a support ring groove 211 is axially opened on the side wall of the installation rod 21, and a plurality of fixing blocks 212 are slidably connected in the support ring groove 211. On one side wall of each fixing block 212 facing away from the bottom wall of the support ring groove 211, a locking member 213 is arranged. In this embodiment, the locking member 213 is a bolt. A plurality of threaded holes for connecting the locking member 213 are axially opened on the inner wall of the support ring groove 211. The locking member 213 passes through the fixing block 212 and is connected to the corresponding threaded hole, thereby positioning the fixing block 212.

[0049] Refer to Figure 1 and Figure 3, on the side wall of each fixed block 212 facing away from the inner wall of the support ring groove 211, a support rod 214 is hingedly connected. The outer wall of the end of the support rod 214 facing away from the fixed block 212 is threadedly connected with an extension tube 215. The extension tube 215 can move relative to the fixed block 212 through threaded cooperation. The end wall of the extension tube 215 facing away from the support rod 214 is hingedly connected with a fixed rod 216. One end of the fixed rod 216 is inserted into the bottom wall of the foundation pit body 1, so as to form a support with the bottom wall of the foundation pit body 1, thereby improving the installation stability of the installation rod 21.

[0050] Refer to Figure 1 and Figure 4 , at one end of the installation rod 21 facing away from the bottom wall of the foundation pit body 1, an installation frame 23 is provided. The installation block 221 includes two separable frames 231 that can rotate relative to each other. On the side wall of the separable frame 231 facing the inner wall of the foundation pit body 1, an insertion rod 232 is integrally formed. The insertion rod 232 is inserted into the inner wall of the foundation pit body 1, so that the separable frame 231 can be in contact with the inner wall of the foundation pit body 1 to improve stability; on the inner walls of the two separable frames 231 facing each other, a contact plate 2311 is integrally formed. The separable frame 231 is provided for the end of the installation cross beam 22 to be inserted. When the installation cross beam 22 is inserted into the separable frame 231, it can be connected to the contact plate 2311 through bolts; on the top wall of the installation rod 21, a limit component 5 is provided for fixing the angle after the separable frame 231 rotates.

[0051] Refer to Figure 5 , the limit component 5 includes a fixed tube 51, two rotating arc cylinders 52, a pull rod 53, two ratchet claws 54, two reset components 55 and two groups of ratchet teeth groups 56. Among them, the separable frame 231, the rotating arc cylinder 52, the ratchet claw 54, the reset component 55 and the ratchet teeth group 56 are arranged in one-to-one correspondence.

[0052] Refer to Figure 4 and Figure 5 , the fixed tube 51 is connected to the top wall of the installation rod 21 by welding. The fixed tube 51 is vertically arranged and coaxial with the installation rod 21. At the center of each of the two rotating arc cylinders 52, a sleeve ring is integrally formed. The sleeve ring is sleeved on the peripheral wall of the fixed tube 51 and forms a rotational connection with the fixed tube 51. The separable frame 231 is then connected to the outer wall of the corresponding rotating arc cylinder 52 by welding to rotate synchronously with the rotating arc cylinder 52; the pull rod 53 is slidably connected inside the fixed tube 51. The pull rod 53 is in contact with the inner wall of the fixed tube 51. One end of the pull rod 53 extending out of the fixed tube 51 is connected with a pull ring. The bottom wall of the pull rod 53 is adhesively connected with a spring. The other end of the spring is adhesively abutted against the bottom wall of the fixed tube 51. When the pull rod 53 is pulled, the spring will be stretched, thereby accumulating elastic potential energy for the pull rod 53 to reset.

[0053] Refer to Figure 4 and Figure 5, both pawls 54 are hingedly connected to the peripheral wall of the draw rod 53. In this embodiment, the reset member 55 is a torsion spring. The reset member 55 is arranged at the hinge connection between the corresponding pawl 54 and the draw rod 53. One end lever arm of the reset member 55 is adhesively connected to the pawl 54, and the other end lever arm is adhesively connected to the peripheral wall of the draw rod 53 to reset the pawl 54 after it rotates. Both pawls 54 are arranged towards the direction of their respective corresponding rotating arc cylinders 52. Two disassembly grooves 511 are penetrated through the side wall of the fixed cylinder 51 in the thickness direction for the pawls 54 to extend and slide. The length direction of the disassembly groove 511 is the same as the length direction of the fixed tube 51. The ratchet group 56 is connected to the inner wall of the corresponding rotating arc cylinder 52 by welding. The ratchet group 56 is arranged along the circumferential direction of the inner wall of the corresponding rotating arc cylinder 52. The pawl 54 is engaged with the corresponding ratchet group 56. When the separation frame 231 is rotated, due to the existence of the pawl 54 and the ratchet group 56, only the two separation frames 231 can be rotated towards the direction away from each other and cannot rotate back, thus effectively improving the stability of the separation frame 231. When it is desired to reset the separation frame 231, only by pulling the draw rod 53 can the pawl 54 and the ratchet group 56 be misaligned. At this time, the separation frame 231 can be rotated back, which has high convenience and improves the stability and safety during the installation of the mounting frame 2.

[0054] Refer to Figure 4 and Figure 6 , the bottom walls of both separation frames 231 are connected with gravity cones 4 by ropes. Under the action of gravity, the gravity cones 4 are always vertically arranged. A signal transmitter 41 is arranged on one gravity cone 4, and a signal receiver 42 is arranged on the other gravity cone 4. In this embodiment, the signal transmitter 41 can be selected as an infrared generator, and the signal receiver 42 can be selected as an infrared receiver. The signal transmitter 41 is used to transmit signals, and the signal receiver 42 is used to receive the signals emitted by the signal transmitter 41 on the adjacent mounting rod 21. In this embodiment, only when the mounting rod 21 is vertically arranged so that the separation frame 231 is in a horizontal state and the signal receiver 42 and the signal transmitter 41 are in the same horizontal plane can the signal be received.

[0055] Refer to Figure 4 and Figure 6 , each signal receiver 42 is electrically connected to an indication module 43. If the signal receiver 42 receives a signal, the indication module 43 prompts the staff that the mounting rod 21 has been installed in place and the next step of installation can be carried out; if no signal is received, it prompts the staff that the mounting rod 21 is not installed in place and needs to be adjusted again. In this embodiment, the indication module 43 can be selected as a signal lamp. When the signal receiver 42 receives a signal, the signal lamp flashes green, and when no signal is received, the signal lamp flashes red, so as to enable the staff to judge the installation state of the mounting rod 21.

[0056] Refer toFigure 1 and Figure 2 The installation cross beam 22 includes a number of installation blocks 221 spliced with each other. The installation blocks 221 are in abutment with the inner wall of the foundation pit body 1. In this embodiment, the installation blocks 221 are all trapezoidal blocks, and the side walls of two adjacent installation blocks 221 are in abutment with each other, so that a number of installation blocks 221 can be spliced into a straight installation cross beam 22. A connecting strip is integrally formed on the side wall of each installation block 221, and the connecting strips of two adjacent installation blocks 221 are in abutment with each other, and a fixing member 24 is arranged on the connecting strip. The fixing member 24 is a bolt, so that adjacent installation blocks 221 can be assembled and connected.

[0057] Refer to Figure 1 and Figure 2 On the side wall of each installation block 221 close to the inner wall of the foundation pit body 1, a support fin 2212 is integrally formed. The length direction of the support fin 2212 is the same as the length direction of the installation block 221. The support fin 2212 is inserted into the inner wall of the foundation pit body 1. Then, when the length of the installation cross beam 22 is relatively long, the abutting relationship with the inner wall of the foundation pit body 1 can share the pressure for the installation block 221 and the fixing member 24, thereby reducing the risk of the installation cross beam 22 breaking and improving safety and stability.

[0058] Refer to Figure 2 and Figure 7 Each installation block 221 is provided with an installation hole 2211 penetrating in the thickness direction. A pipe pile 3 is inserted into each installation hole 2211. The pipe pile 3 passes through the installation hole 2211 and is connected to the bottom wall of the foundation pit body 1. By the abutting of the inner wall of the installation hole 2211 and the outer wall of the pipe pile 3, the probability of the pipe pile 3 tilting during pile driving can be reduced, thereby improving the assembly efficiency of the support structure and improving its support effect and safety.

[0059] Refer to Figure 2 and Figure 7 On the inner wall of each installation hole 2211, two clamping grooves 2214 are formed. The two clamping grooves 2214 are symmetrical about the center of the installation hole 2211. Two semi-circular fitting pieces 7 with a thickness that can be flexibly selected can be arranged in the installation hole 2211. A clamping block 71 is integrally formed on the side wall of the fitting piece 7. The clamping block 71 is clamped into the corresponding clamping groove 2214. The two fitting pieces 7 are spliced with each other to form a complete ring. The inner wall of the fitting piece 7 can be fitted with the outer wall of the pipe pile 3, thereby changing the inner diameter of the installation hole 2211 to adapt to the installation of pipe piles 3 with different diameters, so that the outer wall of the pipe pile 3 can be stably abutted, thereby reducing the probability of the pipe pile 3 tilting during pile driving and improving the applicability of the support structure of the present application.

[0060] Refer to Figure 4, The connecting cross beam 25 is used to connect the mounting cross beams 22 on both sides of the mounting rod 21. Mounting columns 251 are hinged to the end walls at both ends of the connecting cross beam 25. Mounting grooves 2213 for inserting the mounting columns 251 are provided on the inner side walls of the mounting blocks 221 close to the mounting rod 21. The connecting cross beam 25 can be connected between the mounting cross beams 22 on both sides of the mounting rod 21 by adjusting the angles of the mounting columns 251; Mounting plates 252 are integrally formed on the peripheral walls of the mounting columns 251. The mounting plates 252 are abutted against the side walls of the mounting blocks 221. By welding the mounting plates 252 and the mounting blocks 221 by the staff, the fixing of the connecting cross beam 25 can be completed, so that the integrity and stability of the entire mounting frame 2 are improved.

[0061] Refer to Figure 4 , A connecting rod 2312 is welded to the bottom wall of each separating frame 2312, and the connecting rod 2312 is arranged vertically. One end of the connecting rod 2312 away from the separating frame 231 is welded to a driven frame 6. The structure of the driven frame 6 is the same as that of the separating frame 231 and can rotate synchronously with the separating frame 231. The driven frame 6 is used to install the mounting cross beam 22 of the second layer, so as to further improve the stability of the installation of the pipe pile 3.

[0062] Refer to Figure 4 , A fixed anchor rod 61 is arranged between the upper and lower mounting cross beams 22. The fixed anchor rod 61 is arranged vertically, and both ends of the fixed anchor rod 61 are threadedly connected to the corresponding mounting cross beams 22, so that the mounting holes 2211 on the upper and lower mounting cross beams 22 can be aligned, which is convenient for installing the pipe pile 3.

[0063] The implementation principle of the multi-row pile foundation pit support structure in the embodiment of the present application is as follows: The mounting frame 2 is set, and whether the mounting frame 2 is installed in accordance with the standard is observed through the signal transmitter 41, the signal receiver 42 and the indication module 43. When the mounting frame 2 is installed in accordance with the standard, its mounting cross beams 22 are also in a horizontal state. The pipe pile 3 is driven through the mounting holes 2211 of the mounting cross beams 22, so that the probability of the pipe pile 3 being inclined can be reduced, and the time for adjusting the pipe pile 3 can be saved, and the construction efficiency can be improved. At the same time, when the pipe pile 3 can be set vertically, the formed support structure also has better stability and can support the foundation pit body 1 more effectively, thereby improving the safety of the support structure.

[0064] The embodiment of the present application also discloses a construction method for a multi-row pile foundation pit support structure, including the following steps:

[0065] S1: Select an appropriate number of mounting rods 21 according to the number of corners of the foundation pit body 1;

[0066] S2: Vertically set the installation rod 21 at the corner of the foundation pit body 1. By observing the indication module 43, check whether the installation of the installation rod 21 is inclined. If it is inclined, readjust the installation rod 21.

[0067] S3: If it is not inclined, adjust the fixing block 212 to a suitable position, and fix the installation rod 21 through the ratchet sets of the support rod 214, the extension tube 215 and the fixing rod 216.

[0068] S4: Then rotate the separation frame 231 so that the insertion rod 232 of the separation frame 231 is inserted into the inner wall of the foundation pit body 1 until the separation frame 231 fits against the inner wall of the foundation pit body 1.

[0069] S5: Assemble the installation cross beam 22 in the separation frame 231 in sequence. During the installation process, fix the adjacent installation blocks 221 through the fixing member 24, and make the support fins 2212 of the installation blocks 221 inserted into the inner wall of the foundation pit body 1 so that the installation blocks 221 abut against the inner wall of the foundation pit body 1.

[0070] S6: Install according to the above steps, complete the assembly of the second group of installation cross beams 22 in the driven frame, and connect the upper and lower groups of installation cross beams 22 through the fixed anchor bolts 61 so that the installation holes 2211 of the upper and lower installation cross beams 22 can remain coaxial.

[0071] S7: According to the diameter of the pipe pile 3, install the fitting piece 7 with a suitable size in the installation hole 2211. After the installation is completed, pass the pipe pile 3 through the installation hole 2211 in sequence and fix it to the foundation pit body 1 so that the fitting piece 7 can wrap around the outer wall of the pipe pile 3.

[0072] The above are all the preferred embodiments of this application. The protection scope of this application is not limited by this. Therefore, all equivalent changes made according to the structure, shape and principle of this application should be covered within the protection scope of this application.

Claims

1. Multi-row pile foundation pit support structure, including the foundation pit body (1), characterized in that: An installation frame (2) is arranged along the circumferential direction on the inner wall of the foundation pit body (1). The installation frame (2) is provided with installation holes (2211) penetrating in the thickness direction. Each installation hole (2211) is inserted with a pipe pile (3), and the pipe pile (3) passes through the installation hole (2211) and is inserted into the bottom wall of the foundation pit body (1); Two gravity cones (4) are arranged on the bottom wall of the installation frame (2). A signal transmitter (41) is arranged on one of the gravity cones (4), and a signal receiver (42) is arranged on the other gravity cone (4). The signal receiver (42) is used to receive the signal emitted by the signal transmitter (41) when it is in the same plane as the signal transmitter (41); The signal receiver (42) is electrically connected to an indication module (43). If the signal receiver (42) receives a signal, the indication module (43) prompts that the installation frame (2) is in a horizontal state; Otherwise, it is not in a horizontal state; The installation frame (2) includes a plurality of installation rods (21) and a plurality of installation cross beams (22). The installation rods (21) are arranged vertically. An installation frame (23) for inserting the installation cross beams (22) on both sides is arranged on the side wall of the installation rod (21). The side wall of the installation frame (23) abuts against the inner wall of the foundation pit body (1). The installation cross beam (22) includes a plurality of mutually spliced installation blocks (221). The installation blocks (221) abut against the inner wall of the foundation pit body (1). The installation holes (2211) are opened on the installation blocks (221). A fixing member (24) for connection is arranged between adjacent installation blocks (221); An insertion rod (232) is arranged on the side wall of the installation frame (23) facing the foundation pit body (1). The insertion rod (232) is inserted into the inner wall of the foundation pit body (1). A support ring groove (211) is opened on the side wall of the installation rod (21) along the circumferential direction. A fixing block (212) is slidably connected in the support ring groove (211). A locking member (213) for fixing the fixing block (212) to the installation rod (21) is arranged on the side wall of the fixing block (212). A support rod (214) is hinged on the side wall of the fixing block (212). One end of the support rod (214) away from the fixing block (212) is sleeved with an extension tube (215). The extension tube (215) is detachably connected to the support rod (214). One end of the extension tube (215) away from the support rod (214) is hinged to a fixing rod (216). The fixing rod (216) is inserted into the bottom wall of the foundation pit body (1); The installation frame (23) includes two separation frames (231). Both the separation frames (231) are rotatably connected to the installation rod (21). An abutting plate (2311) is arranged in both the separation frames (231). After the installation block (221) of the installation cross beam (22) is inserted into the installation frame (23), it is connected to the abutting plate (2311). A limiting component (5) for fixing the separation frame (231) is arranged on the installation rod (21); The limiting assembly (5) comprises a fixed tube (51), two rotating arc tubes (52), a draw rod (53), two ratchet pawls (54), two reset members (55) and two groups of ratchet tooth groups (56); the separation frame (231), the rotating arc tube (52), the ratchet pawls (54), the reset member (55) and the ratchet tooth groups (56) correspond to each other one by one; the fixed tube (51) is vertically connected to the top wall of the mounting rod (21); the two rotating arc tubes (52) are both sleeved on the outer wall of the fixed tube (51) and are rotatably connected to the fixed tube (51); the separation frame (231) is connected to the outer wall of the corresponding rotating arc tube (52); the draw rod (53) is slidably connected to the inside of the fixed tube (51); the two ratchet pawls (54) are hingedly connected to the side wall of the draw rod (53), the reset member (55) is connected to the corresponding ratchet (54), the reset member (55) drives the ratchet (54) to rotate and then reset, the ratchet group (56) is connected to the inner wall of the corresponding rotating arc tube (52), the ratchet group (56) is arranged along the circumferential direction of the inner wall of the rotating arc tube (52), the side wall of the fixed tube (51) is provided with a disassembly groove (511) for the ratchet (54) to pass through and slide, the ratchet (54) passes through the disassembly groove (511) and is clamped with the corresponding ratchet group (56), the ratchet (54) and the ratchet group (56) are used to make the two separation frames (231) can only rotate in directions away from each other.

2. The multi-row pile foundation pit support structure according to claim 1, characterized in that: A connecting rod (2312) is provided on the bottom wall of each separation frame (231), and one end of the connecting rod (2312) facing away from the separation frame (231) is connected to a driven frame (6), and the driven frame (6) is used to fix the installation beam (22). Two groups of the installation beams (22) are arranged along the depth direction of the foundation pit body (1), and a fixed anchor rod (61) for positioning is arranged between the two groups of the installation beams (22).

3. The multi-row pile foundation pit support structure according to claim 1, characterized in that: A support fin (2212) is provided on a side of the mounting block (221) facing the inner wall of the foundation pit body (1), and the support fin (2212) is inserted into the inner wall of the foundation pit body (1).

4. The multi-row pile foundation pit support structure according to claim 1, characterized in that: The mounting frame (2) further comprises a plurality of connecting beams (25), both end walls of the connecting beams (25) being hingedly connected with mounting columns (251), a side wall of the mounting block (221) facing away from the foundation pit body (1) being provided with a mounting groove (2213) for inserting the mounting column (251), a peripheral wall of the mounting column (251) being provided with a mounting plate (252), the mounting plate (252) being abutted against the side wall of the mounting block (221), and the connecting beams (25) being used to connect the mounting beams (22) on both sides of the mounting rod (21).

5. The multi-row pile foundation pit support structure according to claim 1, characterized in that: A plurality of clamping grooves (2214) are formed in the inner wall of the mounting hole (2211), and the plurality of clamping grooves (2214) are uniformly distributed along the circumferential direction of the inner wall of the mounting hole (2211). A plurality of fitting pieces (7) are arranged in the mounting hole (2211) corresponding to the clamping grooves (2214). A clamping block (71) is arranged on the side wall of the fitting piece (7), and the clamping block (71) is inserted into the corresponding clamping groove (2214), and the fitting piece (7) is attached to the outer wall of the pipe pile (3).

6. The construction method of the multi-row pile foundation pit support structure according to claim 2, characterized in that: The method comprises the following steps: Select an appropriate number of mounting rods (21) according to the number of the corners of the foundation pit body (1); Fix the mounting rod (21) at the corner of the foundation pit body (1), observe the indication module (43), and check whether the mounting of the mounting rod (21) is inclined. If it is inclined, re-fix the mounting rod (21); If it is not inclined, rotate the separation frame (231) so that the separation frame (231) is attached to the inner wall of the foundation pit body (1); Assemble the mounting cross beam (22) in the separation frame (231) in sequence, and fix the adjacent mounting blocks (221) through the fixing member (24); Assemble the mounting cross beam (22) in the driven frame (6) in sequence, fix the adjacent mounting blocks (221) through the fixing member (24), and connect the upper and lower mounting cross beams (22) through the fixing anchor rod (61) so that the mounting holes (2211) of the upper and lower mounting cross beams (22) can be coaxial; Install the fitting pieces (7) with appropriate sizes in the mounting holes (2211) according to the diameter of the pipe pile (3). After the installation is completed, pass the pipe pile (3) through the mounting holes (2211) in sequence and fix it to the foundation pit body (1).

Images