Structure and construction method for enhancing recyclability of row pile structure

Abstract

This invention belongs to the field of deep foundation pit support technology, and discloses a structure and construction method for enhancing the recyclability of pile structures. It includes several cast-in-place piles and several steel pipe piles, with the cast-in-place piles and steel pipe piles positioned correspondingly. Longitudinal hoops connect the tops of the cast-in-place piles and their corresponding steel pipe piles. Transverse hoops connect the tops of the cast-in-place piles or steel pipe piles, and adjacent cast-in-place piles or adjacent steel pipe piles are connected by steel ropes through their transverse hoops. A support mechanism is hinged to the foundation pit side of the transverse hoops of the steel pipe piles. A fixing mechanism is inserted at the bottom of the foundation pit and hinged to the support mechanism. Several waist beams are connected to the foundation pit side of the steel pipe piles, with hinged members connecting adjacent waist beams. An anchor cable is also provided on the soil side of the waist beam at the midpoint between two steel pipe piles, with the anchor cable diagonally inserted downwards into the soil layer. One end of the auxiliary support mechanism is hinged to the waist beam, and the other end is hinged to the support mechanism. This invention has the technical effect of satisfying support capacity while being applicable to foundation pits with sidewalls at various angles, and improving the recyclability of steel pipe piles.

Description

Technical Field

[0001] This invention belongs to the field of deep foundation pit support technology, specifically relating to a structure and construction method for enhancing the recyclability of pile structures. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] Excavation pit support is a temporary support, reinforcement, and protection measure taken in construction engineering to ensure the safety of underground structure construction and the surrounding environment of the excavation pit. It is designed comprehensively based on geological conditions, excavation pit depth, and the surrounding environment, employing methods such as pile foundations and diaphragm walls to enhance the stability of the excavation pit sidewalls, prevent collapse, and ensure construction safety.

[0004] A pile wall structure is a pile-wall support structure composed of piles arranged in rows at intervals. It is an important component of deep foundation pit support. The pile tops are connected by concrete tie beams, anchor piles, or tie rods to form an integral load-bearing system to resist the earth and water pressure generated during excavation, ensuring the stability of the foundation pit and construction safety. Commonly used pile types include bored piles, driven piles, manually excavated piles, steel pipe piles, I-beam piles, or H-beam piles.

[0005] One existing technology discloses a foundation pit support system for soft strata adjacent to underground structures, comprising two rows of parallel steel pipe piles, with a pile cap beam at the top of each row. The front and rear pile cap beams are connected by transverse reinforcing bars, and concrete is poured inside the steel pipe piles. This scheme uses steel pipe piles instead of cast-in-place piles for support, eliminating the need for curing and effectively shortening the construction period.

[0006] However, the above solution has the following drawbacks:

[0007] The above scheme uses double-row steel pipe piles and connects the steel pipe piles with the concrete as an outer formwork, which increases the support strength and shortens the construction period. However, the steel pipe piles cannot be recycled. If concrete is not poured inside the steel pipe piles, the steel pipe piles will be deformed or bent by the soil side pressure when the foundation pit is excavated. Even if they are recycled, the steel pipe piles can only be melted down and remade, which has the defects of poor recyclability and non-recyclability.

[0008] In addition, the above scheme sets a pile cap beam at the top of the steel pipe pile. The pile cap beam is made of channel steel. It can be used in square rectangular foundation pits or other regular-shaped foundation pits. However, when facing foundation pits with different angle sidewalls (such as rings), it has the defect of not being able to adapt to foundation pits with different angle sidewalls. Summary of the Invention

[0009] In view of this, the purpose of the present invention is to provide a structure and construction method that enhances the recyclability of pile structures. The structure of the present invention can solve the technical problems of poor recyclability of existing pile structures and inability to adapt to foundation pits with different angles.

[0010] To achieve the above objectives, the present invention adopts the following technical solution:

[0011] Firstly, a structure for enhancing the recyclability of pile structures is provided, comprising:

[0012] Double-row piles consist of several cast-in-place piles outside the sidewall of the foundation pit and several steel pipe piles at the sidewall of the foundation pit. The cast-in-place piles and steel pipe piles are positioned correspondingly, and a concrete waterproof layer is constructed between the double-row piles.

[0013] Longitudinal hoop, which connects the top of the cast-in-place pile to the corresponding steel pipe pile;

[0014] The transverse hoop is connected to the top of the cast-in-place pile or steel pipe pile, and the transverse hoops of adjacent cast-in-place piles or adjacent steel pipe piles are connected by steel ropes.

[0015] The support mechanism is hinged to the side of the foundation pit of the transverse hoop of the steel pipe pile;

[0016] The fixing mechanism is inserted at the bottom of the pit and hinged to the support mechanism.

[0017] The waist beams are connected to the foundation pit side of the steel pipe piles, and there are hinges between adjacent waist beams; on the soil side of the waist beams, there are also anchor cables at the middle position between two steel pipe piles, and the anchor cables are inserted into the soil layer at an angle downward.

[0018] The auxiliary support mechanism is hinged at one end to the waist beam and at the other end to the support mechanism.

[0019] Preferably, the longitudinal hoop includes two symmetrical U-shaped hoops, the width of which is equal to the diameter of the cast-in-place pile or steel pipe pile. The end face of the U-shaped hoop is fixed with a connecting block, and a connecting plate is fixedly connected between the connecting blocks.

[0020] Preferably, the transverse hoop includes a casing pile, which is hooped on the outer periphery of the top of the cast-in-place pile or steel pipe pile, and the casing pile is located below the longitudinal hoop; a hoop frame is fixedly connected to the outside of the casing pile, and a through hole for steel rope is opened on the side plate of the hoop frame.

[0021] Preferably, the support mechanism includes a support base, which is fixedly connected to the pit side of the hoop. A protective shell is hinged to the support base, and a telescopic shaft is slidably connected inside the protective shell. An adjustment box is fixedly connected to the pit side of the protective shell, and an adjustment shaft is rotatably connected inside the adjustment box. A helical gear is provided on the adjustment shaft, and a transmission tooth groove that meshes with the helical gear is provided on the telescopic shaft. An adjustment handle is connected to the bottom end of the adjustment shaft. A hinged seat is fixedly connected to the steel pipe pile side of the protective shell.

[0022] Preferably, the fixing mechanism includes a fixing base plate, with several anchors fixedly connected to the bottom surface of the fixing base plate and a hollow fixing sleeve hinged to the top surface; the telescopic shaft extends from the end of the protective shell away from the support base and is inserted into the interior of the fixing sleeve.

[0023] Preferably, the auxiliary support mechanism includes an auxiliary support seat fixed on the waist beam, with one end of the support column hinged to the auxiliary support seat and the other end hinged to the hinge seat.

[0024] Preferably, the waist beam includes a waist beam body with a square hole between two steel pipe piles. On the foundation pit side of the waist beam, symmetrical rotating seats are fixedly connected to both sides of the square hole, and a rotating plate is rotatably connected to the rotating seat. A round hole is opened on the rotating plate, and the anchor cable passes through the round hole through the rotating plate and is inserted into the soil layer.

[0025] Preferably, multiple sets of insert rods are fixedly connected to the soil side of the main body of the waist beam, and the spacing between adjacent sets of insert rods is equal to the spacing between the steel pipe piles; an arc plate is fixedly connected to each set of insert rods, and the curvature of the arc plate is consistent with the curvature of the steel pipe pile; through holes corresponding to the insert rods are opened on the steel pipe piles, and support rods are fixedly connected between the arc plates.

[0026] Preferably, the hinge includes two hollow insert plates rotatably connected by a pin. Each hollow insert plate has several locking holes, and locking bolts are screwed into the locking holes. The two ends of the waist beam body are inserted into the hollow insert plates, and the locking bolts are tightened to make them abut against the waist beam body.

[0027] Secondly, a construction method for the aforementioned structure that enhances the recyclability of pile structures is provided, the specific steps of which include:

[0028] Construct cast-in-place piles, steel pipe piles, and concrete waterproofing layers at the corresponding locations outside the foundation pit; clear the soil at the top of the piles and install longitudinal and transverse hoops.

[0029] The foundation pit is excavated to the position of the waist beam installation. The waist beam is installed on the steel pipe piles, and hinged parts are installed between the waist beams. At the same time, the anchor cables are driven into the soil at a certain angle, and auxiliary support seats are installed.

[0030] Excavate to the bottom of the pit, install a fixed base plate at the corresponding position on the bottom of the pit, and fix a support seat on the hoop. Sleeve the telescopic shaft into the fixed sleeve and adjust the length of the support mechanism to make the telescopic shaft press against the fixed sleeve. Then connect the support column of the corresponding length between the hinge seat and the auxiliary support seat.

[0031] After the main construction is completed, the waist beam, auxiliary support mechanism, fixing mechanism, and support mechanism are removed, and the trench is backfilled; finally, the longitudinal hoop and transverse hoop are removed, and the steel pipe piles are recycled.

[0032] Compared with the prior art, the advantages and positive effects of this invention are:

[0033] In this invention, the cast-in-place piles and steel pipe piles are positioned correspondingly. A longitudinal hoop connects the cast-in-place piles and steel pipe piles, enhancing the longitudinal stiffness of the double-row piles and the recyclability of the steel pipe piles. A transverse hoop connects several cast-in-place piles or several steel pipe piles separately, enhancing the transverse stiffness of the double-row piles and the recyclability of the steel pipe piles. A waist beam and hinged joints allow the steel pipe piles to be used in foundation pits with sidewalls at various angles. The transverse hoop, support mechanism, and fixing mechanism work together to reduce the possibility of bending at the top of the steel pipe pile under stress, and, in conjunction with the auxiliary support mechanism, form a triangular support and tension, reducing the possibility of the support mechanism bending from the middle and increasing its service life. This invention can meet the requirements for support capacity, is applicable to foundation pits with sidewalls at various angles, protect the steel pipe piles, improve their recyclability, and save construction costs. Attached Figure Description

[0034] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0035] Figure 1 This is a schematic diagram of a structure for enhancing the recyclability of pile structures, as described in Embodiment 1 or Embodiment 2 of the present invention, embedded in the soil.

[0036] Figure 2 This is a cross-sectional view of a structure for enhancing the recyclability of a pile foundation according to Embodiment 1 or Embodiment 2 of the present invention;

[0037] Figure 3 This is a perspective view of a structure that enhances the recyclability of a pile foundation structure according to Embodiment 1 or Embodiment 2 of the present invention;

[0038] Figure 4 This is a schematic diagram of the longitudinal hoop and the transverse hoop of Embodiment 1 or Embodiment 2 of the present invention;

[0039] Figure 5 This is a schematic diagram of the support structure of Embodiment 1 or Embodiment 2 of the present invention;

[0040] Figure 6 This is a schematic diagram of the pit side of the waist beam in Embodiment 1 or Embodiment 2 of the present invention;

[0041] Figure 7 This is a schematic diagram of the soil side of the waist beam in Embodiment 1 or Embodiment 2 of the present invention;

[0042] In the picture:

[0043] 1. Excavation pit; 2. Soil layer; 3. Concrete waterproof layer; 4. Cast-in-place pile; 5. Steel pipe pile; 6. Longitudinal hoop; 601. Connecting plate; 602. U-shaped hoop; 603. Connecting block; 7. Transverse hoop; 701. Hoop frame; 702. Piling; 703. Perforation; 8. Support mechanism; 801. Support base; 802. Protective shell; 803. Adjusting shaft; 804. Adjusting box; 805. Adjusting handle; 806. Hinge 807. Connector; 9. Telescopic shaft; 10. Fixing mechanism; 11. Fixing sleeve; 12. Fixing base plate; 13. Anchor nail; 14. Auxiliary support mechanism; 15. Auxiliary support seat; 16. Support column; 17. Waist beam; 18. Waist beam body; 19. Rotating seat; 10. Rotating plate; 10. Support rod; 11. Arc plate; 12. Insert rod; 13. Anchor cable; 14. Hinge. Detailed Implementation

[0044] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0045] The present invention will now be described in detail with reference to the accompanying drawings.

[0046] Example 1

[0047] This embodiment discloses a structure to enhance the recyclability of pile foundation structures, such as... Figures 1 to 3 As shown, the piles consist of several equidistant and uniformly arranged cast-in-place piles 4 located in the soil layer 2 at the outer edge of the sidewall of the foundation pit 1 and several equidistant and uniformly arranged steel pipe piles 5 at the sidewall of the foundation pit 1, forming a double row of piles. The cast-in-place piles 4 are parallel to the steel pipe piles 5 and the sidewall of the foundation pit 1 in the direction parallel to the sidewall of the foundation pit 1, and the cast-in-place piles 4 and the steel pipe piles 5 are positioned corresponding to each other in the direction towards the sidewall of the foundation pit 1.

[0048] This design utilizes the fact that the cast-in-place pile 4 can form a good integral structure with the soil layer 2. The cast-in-place pile 4 blocks most of the soil lateral pressure on the outside of the steel pipe pile 5, reducing the bearing pressure of the steel pipe pile 5 and preventing the steel pipe pile 5 from being bent by directly bearing the soil lateral pressure, thus improving the recyclability of the steel pipe pile 5. The steel pipe pile 5 provides certain support for the cast-in-place pile 4 on the foundation pit side, enhancing the support force of the double-row piles.

[0049] like Figures 1 to 4 As shown, a longitudinal hoop 6 connects the top of the cast-in-place pile 4 and the corresponding steel pipe pile 5. The longitudinal hoop 6 strengthens the connection between the cast-in-place pile 4 and the corresponding steel pipe pile 5, enabling them to work together to bear the load. This, in turn, enhances the longitudinal stiffness of the double-row piles and the recyclability of the steel pipe pile 5.

[0050] like Figures 1 to 4As shown, the top of both the cast-in-place pile 4 and the steel pipe pile 5 is equipped with a transverse hoop 7, and the transverse hoops 7 of the cast-in-place pile 4 are connected by steel ropes; the transverse hoops 7 of the steel pipe pile 5 are also connected by steel ropes. The steel ropes enable a flexible connection between the cast-in-place piles 4 and the steel pipe piles 5, allowing the cast-in-place piles 4 and the steel pipe piles 5 in the same row to share the load, improving the lateral stiffness of the double-row piles and the recyclability of the steel pipe piles 5; it also allows the cast-in-place piles 4 and the steel pipe piles 5 to adaptably meet the requirements of the foundation pit sidewalls at different angles.

[0051] like Figures 1 to 4 As shown, a support mechanism 8 is hinged to the pit side of the transverse hoop 7 on the steel pipe pile 5, and a fixing mechanism 9 is inserted at the bottom of the pit 1. The positions and numbers of the fixing mechanism 9 and the support mechanism 8 correspond, and the support mechanism 8 and the fixing mechanism 9 are hinged. It should be noted that in this embodiment, during the excavation of the pit 1, the soil on the pit side of the steel pipe pile 5 is removed, and the soil on the soil side of the steel pipe pile 5 will exert lateral earth pressure on the steel pipe pile 5. In this embodiment, a fixing mechanism 9 is inserted at the bottom of the pit 1, and the fixing mechanism 9, the support mechanism 8, and the transverse hoop 7 of the steel pipe pile 5 are connected together, so that the fixing mechanism 9 and the support mechanism 8 provide support for the steel pipe pile 5, preventing the steel pipe pile 5 from being squeezed, bent, and deformed by the earth pressure, and improving the recyclability of the steel pipe pile 5.

[0052] In this embodiment, as Figures 1 to 4 As shown, several waist beams 11 are connected to the foundation pit side of the steel pipe piles 5, and hinges 13 are connected between adjacent waist beams 11. It should be noted that the waist beams 11 are set to improve the overall lateral stiffness of the inner row of steel pipe piles 5. The hinges 13 connect adjacent waist beams 11, allowing them to rotate and enabling the double-row piles to be used in foundation pits 1 with different sidewall angles. In this embodiment, every two steel pipe piles 5 form a group, and the sidewalls of the two steel pipe piles 5 in the same group are connected to the same waist beam 11, with hinges 13 connecting adjacent waist beams 11. In some embodiments, three, four, or more steel pipe piles 5 can also be grouped together, depending on the actual foundation pit length or angle.

[0053] like Figures 1 to 4 As shown, an auxiliary support mechanism 10 connects the lumbar beam 11 and the corresponding support mechanism 8 on the steel pipe pile 5. One end of the auxiliary support mechanism 10 is hinged to the lumbar beam 11, and the other end is hinged to the support mechanism 8. The auxiliary support mechanism 10 strengthens the support rigidity of the support mechanism 8. Figures 1 to 4 As shown, the waist beam 11 is also equipped with an anchor cable 12 at the middle position of the two steel pipe piles 5, and the anchor cable 12 is inserted into the soil layer 2 at an angle downward.

[0054] It should be explained that the support mechanism 8, the fixing mechanism 9, the auxiliary support mechanism 10, the waist beam 11, the anchor cable 12, and the hinge component 13 were all installed during the excavation of the foundation pit 1.

[0055] It should also be explained that, in this embodiment, several equidistant and uniformly arranged fixing mechanisms 9 are set at the bottom of the foundation pit 1, and a support mechanism 8 is connected between the fixing mechanism 9 and the corresponding transverse hoop 7 (the two ends of the support mechanism 8 are respectively hinged to the fixing mechanism 9 and the transverse hoop 7). Multiple symmetrically distributed auxiliary support mechanisms 10 are hinged on the waist beam 11, and the other end of the auxiliary support mechanism 10 is hinged to the corresponding support mechanism 8. Through the cooperation of the transverse hoop 7, the support mechanism 8 and the fixing mechanism 9, the possibility of bending of the top of the steel pipe pile 5 under stress can be reduced. At the same time, the support mechanism 8 and the auxiliary support mechanism 10 cooperate to form a double triangular support and tension structure, which reduces the possibility of the support mechanism 8 bending from the middle and improves the service life of the support mechanism 8. By setting anchor cables 12 on the waist beam 11 and driving them into the soil layer 2 at a set angle, the anchor cables 12 cooperate with the waist beam 11, further improving the overall transverse stiffness of the steel pipe pile 5 and improving the recyclability of the steel pipe pile 5.

[0056] It should be noted that before excavation, pits are drilled at corresponding locations along the outer edge of the pit, and cement is poured into the pits to form several cast-in-place piles 4. Several steel pipe piles 5 are then driven or inserted at designated locations on the sidewalls of the pit. The cast-in-place piles 4 and the steel pipe piles 5 form a double-row pile structure, improving the overall support capacity. Two parallel and continuous pit walls are constructed between the double-row piles, and prepared cement is poured between the pit walls to form a concrete waterproof layer 3, improving the waterproofing effect of the pit support.

[0057] like Figures 1 to 4 As shown, the longitudinal hoop 6 is located above the corresponding transverse hoop 7, and the transverse hoop 7 is located above the soil layer 2. Before excavating the foundation pit 1, the top soil of the cast-in-place piles 4 and steel pipe piles 5 is removed. Above the transverse hoop 7, the longitudinal hoop 6 is used to connect the steel pipe piles 5 to the corresponding cast-in-place piles 4, enhancing the longitudinal stiffness of the double-row piles and the recyclability of the steel pipe piles 5. Transverse hoop 7 is installed on the cast-in-place piles 4 or steel pipe piles 5, and the transverse hoop 7 on adjacent cast-in-place piles 4 or adjacent steel pipe piles 5 is connected by steel ropes. The transverse hoop 7 connected by steel ropes form a detachable cap beam, improving the transverse stiffness of the double-row piles and the recyclability of the steel pipe piles 5.

[0058] like Figure 3 , Figure 4 As shown, the longitudinal hoop 6 includes two symmetrically arranged U-shaped hoops 602. The specifications of the U-shaped hoops 602 correspond to the specifications of the cast-in-place pile 4 or the steel pipe pile 5, that is, the width of the U-shaped hoop 602 is equal to the diameter of the cast-in-place pile 4 or the steel pipe pile 5. The two U-shaped hoops 602 are positioned opposite each other and are respectively hooped onto the corresponding cast-in-place pile 4 and steel pipe pile 5. The end faces of the U-shaped hoops 602 are fixedly connected (e.g., by welding or bolting) to connecting blocks 603, and the two connecting blocks 603 are fixedly connected (e.g., by welding or bolting) to connecting plates 601. The connecting plates 601 support or pull the cast-in-place pile 4 and the steel pipe pile 5.

[0059] Understandably, during actual construction, a suitable specification (size) of connecting plate 601 is selected based on the actual distance between two corresponding cast-in-place piles 4 and steel pipe piles 5. U-shaped hoop 602 is then attached to the corresponding cast-in-place piles 4 and steel pipe piles 5, and the U-shaped hoop 602 is fixedly connected to the corresponding connecting block 603. This allows the connecting plate 601, U-shaped hoop 602, and connecting block 603 to cooperate, limiting the distance between the two corresponding cast-in-place piles 4 and steel pipe piles 5 and improving the longitudinal stability of the pile structure.

[0060] like Figure 3 , Figure 4 As shown, the transverse hoop 7 includes a sleeve 702, which is hooped onto the outer periphery of the top of the cast-in-place pile 4 or the steel pipe pile 5. A hoop frame 701 is fixedly connected to the outer side of the sleeve 702. Through holes 703 are opened on the two side plates of the hoop frame 701. A steel rope is passed through the through holes 703 of adjacent transverse hoops 7 to connect the adjacent transverse hoops 7. Relying on the tensile strength of the steel rope, the distance between adjacent cast-in-place piles 4 or adjacent steel pipe piles 5 is limited, the stress structure is optimized, and the transverse stability of the cast-in-place piles 4 or steel pipe piles 5 is improved.

[0061] like Figure 3 , Figure 4 , Figure 5 As shown, the support mechanism 8 is hinged to the pit side of the hoop 701. The support mechanism 8 includes a support base 801, which is fixed to the pit side of the hoop 701. A protective shell 802 is hinged to the support base 801. A telescopic shaft 807 is slidably connected inside the protective shell 802. An adjusting box 804 is fixedly connected to the pit side of the protective shell 802. An adjusting shaft 803 is rotatably connected inside the adjusting box 804. A helical gear is provided on the adjusting shaft 803. A number of equally spaced transmission tooth grooves corresponding to the specifications of the helical gear are provided on the telescopic shaft 807. The helical gear meshes with the transmission tooth grooves. An adjusting handle 805 is connected to the bottom end of the adjusting shaft 803. The adjusting handle 805 is located outside (below) of the adjusting box 804, and the helical gear is located inside the adjusting box 804. A hinge seat 806 is fixedly connected to the steel pipe pile side of the protective shell 802. The telescopic shaft 807 extends from the end of the protective shell 802 away from the support base 801.

[0062] Understandably, based on the excavation depth of the foundation pit 1, rotating the adjustment handle 805 causes the adjustment shaft 803 to rotate, which in turn causes the helical gear to rotate, thereby causing the telescopic shaft 807 to extend or retract, thus adjusting the total length of the support mechanism 8.

[0063] like Figures 1 to 5As shown, the fixing mechanism 9 includes a fixing base plate 902. Several anchor nails 903 are fixedly connected to the bottom surface of the fixing base plate 902. The fixing base plate 902 is placed on the bottom surface of the corresponding position in the foundation pit 1. Pressing the fixing base plate 902 inserts the anchor nails 903 into the soil layer at the bottom of the foundation pit 1, thus fixing the fixing mechanism 9 to the bottom of the foundation pit 1. A hollow fixing sleeve 901 is hinged to the top surface of the fixing base plate 902, and a telescopic shaft 807 is inserted into the fixing sleeve 901.

[0064] Understandably, during the excavation of the foundation pit, the telescopic shaft 807 is fitted inside the fixed sleeve 901, and the fixed base plate 902 is fixed at the corresponding position in the foundation pit 1 by several anchor nails 903 according to the excavation depth; then the total length of the support mechanism 8 is adjusted so that the telescopic shaft 807 is pressed against the fixed sleeve 901 to support the top of the steel pipe pile 5.

[0065] like Figures 1 to 5 As shown, the auxiliary support mechanism 10 includes an auxiliary support seat 1001, and a support column 1002 is hinged between the auxiliary support seat 1001 and the hinge seat 806. During the excavation of the foundation pit 1, a waist beam 11 is connected to the side wall of the steel pipe pile 5, and the auxiliary support seat 1001 is bolted or welded to the waist beam 11. After the support mechanism 8 and the fixing mechanism 9 are connected, the support column 1002 of the corresponding length is installed between the auxiliary support seat 1001 and the hinge seat 806. The support column 1002 provides support for the waist of the protective shell 802. The auxiliary support seat 1001, the support column 1002, the support seat 801 and the protective shell 802 form a triangle. Through the stability of the triangle, the longitudinal stiffness of the support mechanism 8 is improved, and the support effect is enhanced.

[0066] like Figure 4 , Figure 6 , Figure 7 As shown, the waist beam 11 includes a waist beam body 1101. The two ends of the waist beam body 1101 are inserted into the interior of the hinge member 13 and locked by several locking bolts on the hinge member 13. Two adjacent waist beam bodies 1101 are connected by the hinge member 13.

[0067] like Figure 7 As shown, a square hole is provided on the main body 1101 of the waist beam, and symmetrically arranged rotating seats 1102 are fixed on both sides of the square hole. The rotating seats 1102 are located on the pit side of the main body 1101 of the waist beam. Rotating rods are fixedly connected to both ends of the rotating plate 1103, and the rotating rods are rotatably connected in the rotating grooves of the rotating seats 1102, so that the rotating plate 1103 is rotatably connected between the two rotating seats 1102. Figure 2 , Figure 6 As shown, a circular hole is provided on the rotating plate 1103. The anchor cable 12 passes through the circular hole through the rotating plate 1103 and is inserted into the soil layer 2 to provide anchoring force for the waist beam 11.

[0068] like Figure 7As shown, multiple sets of insert rods 1106 are fixedly connected to the soil side of the main body 1101 of the waist beam. The distance between adjacent sets of insert rods 1106 is equal to the distance between the steel pipe piles 5. An arc plate 1105 is fixedly connected to each set of insert rods 1106, and the curvature of the arc plate 1105 is consistent with the curvature of the steel pipe pile 5. Through holes corresponding to the insert rods 1106 are opened on the steel pipe piles 5. The arc plates 1105 are fitted against the side wall of the steel pipe pile 5, and the insert rods 1106 are inserted into the corresponding through holes of the steel pipe pile 5. To strengthen the connection between the arc plates 1105, the support rods 1104 pass through the adjacent connecting arc plates 1105.

[0069] Understandably, during the excavation of the foundation pit, the main body 1101 of the waist beam is fixed to the side wall of the steel pipe pile 5 using insert rods 1106. The rotating plate 1103 is fastened to the two rotating seats 1102, and the anchor cable 12 is driven into the soil layer 2 through the round holes. The rotating seats 1102 and the rotating plate 1103 are detachable, and the angle of the rotating plate 1103 relative to the main body 1101 of the waist beam can be changed to match the angle at which the anchor cable 12 is driven into the soil layer 2, thereby improving the support effect.

[0070] like Figure 6 , Figure 7 As shown, the hinge 13 includes a first mating plate and a second mating plate, which are rotatably connected by a connecting pin. Several locking holes are provided on both the first and second mating plates, and locking bolts are screwed into the locking holes. The two ends of the waist beam body 1101 are inserted into the first or second mating plate, and the locking bolts are tightened to make them abut against the waist beam body 1101.

[0071] Example 2

[0072] This embodiment discloses a construction method for a structure that enhances the recyclability of a pile wall structure. It applies a structure for enhancing the recyclability of a pile wall structure disclosed in Embodiment 1. The specific steps include:

[0073] Pit holes are drilled at corresponding positions on the outer edge of the foundation pit 1, and cement is poured into the pit holes to form several cast-in-place piles 4. Several steel pipe piles 5 are inserted at corresponding positions on the side wall of the foundation pit 1, and the cast-in-place piles 4 and steel pipe piles 5 form a double row of piles.

[0074] Two parallel and continuous pit walls are constructed between the double rows of piles, and cement is poured into the pit walls to form a concrete waterproof layer 3, which improves the waterproof effect of the foundation pit support.

[0075] Clean the soil at the top of the double-row piles and install longitudinal hoop 6 and transverse hoop 7.

[0076] When the foundation pit 1 is excavated to the position of the waist beam 11, the waist beam 11 is installed on the steel pipe pile 5, the hinge 13 is connected between the adjacent waist beams, and the anchor cable 12 is driven into the soil layer 2 at a certain angle, and the auxiliary support seat 1001 is installed.

[0077] Continue excavating to the bottom of the foundation pit 1. Based on the distance between two adjacent steel pipe piles 5, install the corresponding fixed base plate 902 at the corresponding position of the foundation pit 1, and fix the support seat 801 on the hoop 701. Adjust the length of the support mechanism 8 according to the excavation depth, and fit the telescopic shaft of the support mechanism 8 into the fixed sleeve 901 and tighten it. Then connect the support column 1002 of the corresponding length between the hinge seat 806 and the auxiliary support seat 1001.

[0078] After the main construction is completed, the waist beam 11, auxiliary support mechanism 10, fixing mechanism 9, and support mechanism 8 are removed, and the trench is backfilled; then the longitudinal hoop 6 and transverse hoop 7 are removed, and finally the steel pipe pile 5 is recycled.

[0079] In some implementations, the excavation of the foundation pit 1 adopts a layered excavation method. The difference from the above steps is that if the foundation pit 1 adopts a layered excavation method, when excavating the next layer, the auxiliary support mechanism 10, the fixing mechanism 9, and the support mechanism 8 of the current layer are temporarily disconnected.

[0080] During the re-excavation process, the waist beam 11 was installed again at the location where it was necessary to install the waist beam 11, and anchor cables 12 were installed.

[0081] When excavating to the bottom of the next layer, repeat the above steps to connect the waist beam 11, auxiliary support mechanism 10, fixing mechanism 9, and support mechanism 8; repeat the above operation until the bottom of the foundation pit 1 is excavated.

[0082] It is understood that in this embodiment, the cast-in-place piles 4 and steel pipe piles 5 are combined to form a double row of piles, thereby improving the overall support capacity; the cast-in-place piles 4 and steel pipe piles 5 are connected by the longitudinal hoop 6, thereby enhancing the longitudinal stiffness of the support structure and the recyclability of the steel pipe piles 5.

[0083] By using transverse hoop 7 to cooperate with cast-in-place piles 4 and steel pipe piles 5 respectively, several cast-in-place piles 4 and several steel pipe piles 5 are connected to each other, thereby enhancing the transverse stiffness of the support structure and the recyclability of the steel pipe piles 5.

[0084] By cooperating with the waist beam 11, the hinge 13 and the corresponding steel pipe pile 5, the steel pipe pile 5 around the foundation pit is connected, which improves the overall lateral stiffness. The waist beam 11 can be quickly disassembled, which improves recyclability. The hinge 13 can rotate, which drives the adjacent waist beams 11 to rotate. It is suitable for foundation pits with side walls at various angles.

[0085] By cooperating with the transverse hoop 7, the support mechanism 8, and the fixing mechanism 9, the possibility of bending at the top of the steel pipe pile 5 under stress is reduced. In conjunction with the auxiliary support mechanism 10, a triangular support and tension are formed, which reduces the possibility of the support mechanism 8 bending from the middle and improves the service life of the support mechanism 8.

[0086] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A structure for enhancing the recyclability of a row pile structure, characterized by, include: The double-row piles consist of several cast-in-place piles outside the sidewall of the foundation pit and several steel pipe piles at the sidewall of the foundation pit. The cast-in-place piles and steel pipe piles are positioned correspondingly, and a concrete waterproof layer is constructed between the double-row piles. A longitudinal hoop, which connects the top of the cast-in-place pile to the top of the corresponding steel pipe pile; A transverse hoop is attached to the top of a cast-in-place pile or a steel pipe pile, and the transverse hoops of adjacent cast-in-place piles or adjacent steel pipe piles are connected by steel ropes. A support mechanism, which is hinged to the pit side of the transverse hoop of the steel pipe pile; A fixing mechanism is inserted into the bottom of the pit and hinged to the support mechanism; The waist beams are connected to the foundation pit side of the steel pipe piles, and there are hinges between adjacent waist beams; on the soil side of the waist beams, there are also anchor cables at the middle position of the two steel pipe piles, and the anchor cables are inserted into the soil layer at an angle downward. An auxiliary support mechanism, one end of which is hinged to the waist beam and the other end of which is hinged to the support mechanism; The longitudinal hoop includes two symmetrical U-shaped hoops. The width of the U-shaped hoop is equal to the diameter of the cast-in-place pile or steel pipe pile. The end face of the U-shaped hoop is fixed with a connecting block, and a connecting plate is fixedly connected between the connecting blocks. The waist beam includes a waist beam body. On the soil side of the waist beam body, multiple sets of insert rods are fixedly connected, and the spacing between adjacent sets of insert rods is equal to the spacing between steel pipe piles. An arc plate is fixedly connected to each set of insert rods, and the curvature of the arc plate is consistent with the curvature of the steel pipe pile. Through holes corresponding to the insert rods are opened on the steel pipe piles, and support rods are fixedly connected between the arc plates.

2. A structure for enhancing the recyclability of a row pile structure according to claim 1, characterized by, The transverse hoop includes a casing pile, which is hooped on the outer periphery of the top of the cast-in-place pile or steel pipe pile, and the casing pile is located below the longitudinal hoop; a hoop frame is fixedly connected to the outside of the casing pile, and a through hole for steel rope is opened on the side plate of the hoop frame.

3. A structure according to claim 2, wherein The support mechanism includes a support base, which is fixedly connected to the pit side of the hoop. A protective shell is hinged to the support base, and a telescopic shaft is slidably connected inside the protective shell. An adjustment box is fixedly connected to the pit side of the protective shell, and an adjustment shaft is rotatably connected inside the adjustment box. A helical gear is provided on the adjustment shaft, and a transmission tooth groove that meshes with the helical gear is provided on the telescopic shaft. An adjustment handle is connected to the bottom end of the adjustment shaft. A hinged seat is fixedly connected to the steel pipe pile side of the protective shell.

4. The structure for enhancing the recyclability of pile structures as described in claim 3, characterized in that, The fixing mechanism includes a fixing base plate, with several anchors fixedly connected to the bottom surface of the fixing base plate and a hollow fixing sleeve hinged to the top surface; the telescopic shaft extends from the end of the protective shell away from the support base and is inserted into the inside of the fixing sleeve.

5. A structure according to claim 4, wherein The auxiliary support mechanism includes an auxiliary support seat fixed to the waist beam, with one end of the support column hinged to the auxiliary support seat and the other end hinged to the hinge seat.

6. A structure according to claim 1, wherein A square hole is opened on the main body of the waist beam, and the square hole is located between two steel pipe piles; On the side of the foundation pit of the waist beam, symmetrical rotating seats are fixedly connected to both sides of the square hole, and the rotating plate is rotatably connected to the rotating seat; a round hole is opened on the rotating plate, and the anchor cable passes through the round hole through the rotating plate and is inserted into the soil layer.

7. A structure according to claim 1, wherein The hinge includes two hollow insert plates that are rotatably connected by a pin. Each hollow insert plate has several locking holes, and locking bolts are screwed into the locking holes. The two ends of the waist beam body are inserted into the hollow insert plates, and the locking bolts are tightened to make them abut against the waist beam body.

8. The construction method of a structure for enhancing the recyclability of a row pile structure according to claim 5, characterized by, The specific steps include: Construct the cast-in-place piles, steel pipe piles, and concrete waterproofing layer at the corresponding locations outside the foundation pit; clear the soil at the top of the piles and install the longitudinal and transverse hoops. The foundation pit is excavated to the position where the waist beam is installed. The waist beam is installed on the steel pipe piles, and hinges are installed between the waist beams. At the same time, the anchor cable is driven into the soil at a certain angle, and the auxiliary support seat is installed. Excavate to the bottom of the pit, install the fixed base plate at the corresponding position on the bottom of the pit, and fix the support seat on the hoop. Sleeve the telescopic shaft into the fixed sleeve, and adjust the length of the support mechanism so that the telescopic shaft is pressed against the fixed sleeve. Then connect the support column of the corresponding length between the hinge seat and the auxiliary support seat. After the main construction is completed, the waist beam, auxiliary support mechanism, fixing mechanism, and support mechanism are removed, and the trench is backfilled; finally, the longitudinal hoop and transverse hoop are removed, and the steel pipe piles are recycled.

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