Pile foundation reinforcement cage main reinforcement jacking device and construction method

Abstract

The invention discloses a pile foundation reinforcement cage main reinforcement jacking device and a construction method, and relates to the technical field of building construction. The pile foundation reinforcement cage main reinforcement jacking device comprises a clamping module and a pulling and connecting module. The clamping module comprises a supporting plate, a sleeving rod, a pressing block and a nut; the pulling and connecting module comprises a pulling and connecting rod, a first sleeve, a screw rod, a crimping ring, a second sleeve and a rotating shaft; the screw rod is inserted into the first sleeve and is in threaded connection with the first sleeve; the rotating shaft is inserted into the second sleeve and is rotationally connected with the second sleeve; a first inserting hole is formed in the supporting plate; the screw rod is inserted into the first insertion hole of the upper clamping module; and the rotating shaft is inserted into the first insertion hole of the clamping module below. The clamping module is used for limiting the main reinforcements, and coaxial arrangement of the upper main reinforcements and the lower main reinforcements is achieved; the distance between the two clamping modules is adjusted through the pulling and connecting module, so that the upper main reinforcement and the lower main reinforcement are indirectly controlled to be close to each other till abutting against each other, and then the reinforcement sleeve is rotated till the reinforcement sleeve moves downwards and is engaged with the lower main reinforcement.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a main reinforcement tightening device for a pile foundation reinforcement cage and a construction method. Background Art

[0002] The installation of super-long pile foundation reinforcement cages generally adopts the segmented lifting connection method, and the corresponding and adjacent main reinforcements are connected by sleeves, thus having excellent structural stability.

[0003] Since the main bars are affected by various external factors (such as collision, temperature change, etc.) during storage and transportation, the straightness is reduced, which further causes the adjacent main bars to be in a non-coaxial state, making it difficult to connect them using sleeves. In traditional technology, the user needs to bend the main bars to align with each other and then insert them into the sleeve. The operation is cumbersome and requires a lot of manpower (one person needs to hold the main bars to prevent rebound, and another person needs to pull or push the main bars closer to each other). Summary of the invention

[0004] In order to overcome the problem in the above background technology that "adjacent main bars are difficult to connect using sleeves when they are in a non-coaxial state", the present invention provides a main bar tightening device and a construction method for a pile foundation steel cage.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: A main reinforcement tightening device for a pile foundation steel cage, comprising two clamping modules and a tensioning module for adjusting the spacing between the two clamping modules; the clamping modules are arranged parallel to each other, one above and one below; two tensioning modules are provided and are respectively connected to the two ends of the clamping modules; the clamping module comprises a support plate, a sleeve rod, a pressure block and a nut; the support plate is an L-shaped plate structure, the sleeve rod is an n-shaped rod structure, and the support plate is fixedly connected to the sleeve rod in a "Jie" shape; the sleeve rod comprises a bending portion and a straight rod portion respectively arranged at both ends of the bending portion; a sleeve gap for accommodating the main reinforcement is provided at the inner wall of the bending portion; the pressure block is provided with a socket, and the straight rod portion Inserted in the socket and slidably connected; the nut is sleeved on the surface of the straight rod and connected by threads; the pulling module includes a pulling rod, a first sleeve, a screw, a crimping ring, a second sleeve and a rotating shaft; the first sleeve and the second sleeve are respectively fixedly installed at both ends of the pulling rod; the screw is inserted in the first sleeve and connected by threads; the crimping ring is fixedly installed at the top of the screw; the rotating shaft is inserted in the second sleeve and rotatably connected; the support plate is provided with a first plug-in hole; the screw is inserted in the first plug-in hole of the upper clamping module; the rotating shaft is inserted in the first plug-in hole of the lower clamping module.

[0006] As a further optimization solution of the present invention, it also includes a limiting rod for inserting and limiting the two crimping rings.

[0007] As a further optimization solution of the present invention, the side wall of the pressing block close to the bending portion is provided with an abutment protrusion, and the abutment protrusion is provided with an abutment arc surface.

[0008] As a further optimization scheme of the present invention, the connecting rods are arranged in pairs; the top ends of the two connecting rods in a pair are fixedly installed on the two side walls of the first sleeve, and the bottom ends of the two connecting rods in a pair are fixedly installed on the two side walls of the second sleeve.

[0009] As a further optimization solution of the present invention, it also includes a pry bar, and a plug-in gap for accommodating the end of the pry bar is provided between the two paired pull rods.

[0010] As a further optimization solution of the present invention, the bent portion of the sleeve rod is placed at a corner position of the inner wall of the support plate and is fixedly connected to the support plate.

[0011] As a further optimization solution of the present invention, the two straight rod portions on the same sleeve rod are arranged parallel to each other.

[0012] As a further optimization solution of the present invention, the two pulling and connecting modules are arranged parallel to each other.

[0013] As a further optimization scheme of the present invention, a first retaining ring and a second retaining ring are fixedly installed at both ends of the top and bottom of the rotating shaft respectively; the first retaining ring is placed above the second sleeve, and the second retaining ring is placed below the supporting plate below.

[0014] A construction method for a main reinforcement tightening device for a pile foundation steel cage, the steps comprising: S1, placing an upper main reinforcement and a lower main reinforcement in the sleeve gap of two upper and lower sleeve rods respectively; S2, sleeve-fitting two pressure blocks on the upper and lower sleeve rods respectively; S3, screwing a plurality of nuts on the upper and lower sleeve rods respectively, so that the upper sleeve rod and the pressure block clamp the upper main reinforcement, and the lower sleeve rod and the pressure block clamp the lower main reinforcement; S4, rotating the crimping ring, so that the two clamping modules approach each other, driving the upper main reinforcement and the lower main reinforcement to approach each other; S5, rotating the two crimping rings to a coaxial position, and inserting the limit rod into the two crimping rings; S6, using the pry bar to rotate the pulling rod, so that the two clamping modules approach each other, driving the upper main reinforcement and the lower main reinforcement to approach each other, until the upper main reinforcement and the lower main reinforcement are tightened.

[0015] In summary, the present invention has at least one of the following benefits: (1) The present invention has a simple structure and reliable functions. The clamping module is used to limit the main reinforcement and realize the coaxial setting (i.e. alignment) of the upper and lower main reinforcements. The tensioning module is used to adjust the spacing between the two clamping modules, thereby indirectly controlling the upper and lower main reinforcements to approach each other until they are tight, and then the steel sleeve is rotated to its lower side and engages the second external thread at the top of the lower main reinforcement. The present invention can ensure that the main reinforcement of the steel cage is connected as a whole without empty positions, can meet construction requirements, improve engineering quality, and can be widely used in pile foundation projects of various types of bridges.

[0016] (2) The pressing block is provided with an abutting protrusion, and the abutting protrusion is provided with an abutting arc surface. The sleeve rod and the abutting arc surface clamp the main rib from both sides. Compared with the plane contact, the abutting arc surface can increase the contact area between the abutting protrusion and the main rib, thereby increasing the friction force and further improving the clamping stability.

[0017] (3) The limiting rod is inserted into the two crimping rings, and the two crimping rings are simultaneously sleeved on the surface of the limiting rod, so that the crimping ring and the screw can be limited, and it is prevented that when the user rotates the pulling rod, the screw and the crimping ring rotate synchronously with the first sleeve under the action of the friction force at the thread position, thereby realizing the relative rotation of the screw and the first sleeve to change the distance between the two clamping modules.

[0018] (4) The main reinforcement in the pile foundation steel cage is usually arranged in a circular array, so the outer side of the main reinforcement has a larger operating space than the inner side, which is convenient for users to operate the present invention; and because the sleeve gap is located at the corner of the inner wall of the L-shaped support plate, the target main reinforcement is located in the sleeve gap and the outer end of the support plate is directed to the outer side of the main reinforcement of the steel cage, thereby achieving the outer end of the support plate and the remaining main reinforcement giving way, so that users have sufficient space to load and unload and adjust the pressure block, nut and limit rod and operate the pry bar, thereby improving the convenience and efficiency of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present application is further described below with reference to the accompanying drawings: Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the cross-sectional top view of the clamping module; Figure 3 It is a schematic diagram of the structure of the sleeve rod from a top view; Figure 4 It is a front view structural diagram of the pulling module; Figure 5 It is a schematic diagram of the cross-sectional top view of the abutting protrusion; Figure 6 It is a schematic diagram of the connection structure between the abutting protrusion and the pressing block; Figure 7 It is a top view schematic diagram of the present invention in use; Figure 8 It is a schematic diagram of the top view of the structure of the limit rod plugged into the crimping ring; Fig. 9 This is a schematic diagram of the structure of the pry bar prying the connecting rod; Fig.10 This is a schematic diagram of the state of the magnetic attraction ring adsorbing the crimping ring; Fig.11 Schematic diagram of the maximum range of lateral rotation of the pry bar.

[0020] Description of reference numerals: In the figure, 1. Clamping module; 11. Support plate; 111. First plug hole; 12. Sleeve rod; 1201. Bending portion; 1202. Straight rod portion; 121. Sleeve gap; 13. Press block; 131. Plug hole; 132. Abutment protrusion; 133. Abutment arc surface; 14. Nut; 2. Pull-connect module; 21. Pull-connect rod; 22. First sleeve; 23. Screw; 24. Press-connect ring; 25. Second sleeve; 26. Rotating shaft; 261. First retaining ring; 262. Second retaining ring; 3. Limit rod; 31. Magnetic ring; 4. Main reinforcement; 41. Upper main reinforcement; 42. Lower main reinforcement; 43. Steel sleeve; 5. Pry bar. DETAILED DESCRIPTION

[0021] Based on the above structural features of the present application, the implementation methods of the present application are further described: Reference Figure 1-2 The present embodiment provides a main reinforcement tightening device for a pile foundation steel cage, comprising two clamping modules 1 and a connecting module 2 for adjusting the distance between the two clamping modules 1; the clamping modules 1 are arranged in an upper and lower shape and are arranged parallel to each other; two connecting modules 2 are provided and are respectively connected to the two ends of the clamping modules 1. The main reinforcement 4 of the pile foundation steel cage comprises an upper main reinforcement 41 and a lower main reinforcement 42, and a steel sleeve 43 is connected to the outer wall of the bottom end of the upper main reinforcement 41 through a thread; the bottom end of the upper main reinforcement 41 is provided with a first external thread, and the inner wall of the steel sleeve 43 is provided with a first internal thread adapted to the first external thread; the top of the lower main reinforcement 42 is provided with a second external thread adapted to the first internal thread. After the two clamping modules 1 are clamped and fixed to the upper main reinforcement 41 and the lower main reinforcement 42 respectively, the connecting module 2 is adjusted to reduce the distance between the two clamping modules 1, so that the upper main reinforcement 41 and the lower main reinforcement 42 are close to each other until they are tightened.

[0022] Reference Figure 1 to Figure 3The clamping module 1 includes a support plate 11, a sleeve rod 12, a pressure block 13 and a nut 14. The support plate 11 is an L-shaped plate structure, the sleeve rod 12 is a rod-shaped structure bent into an N shape, and the support plate 11 and the sleeve rod 12 are fixedly connected in a "Jie" shape; the sleeve rod 12 includes a bending portion 1201 and a straight rod portion 1202 disposed at both ends of the bending portion 1201; a sleeve gap 121 for accommodating the main reinforcement 4 is disposed at the inner wall of the bending portion 1201; the pressure block 13 is provided with an insertion hole 131, and the straight rod portion 1202 is inserted into the insertion hole 131 and slidably connected; the nut 14 is sleeved on the surface of the straight rod portion 1202 and connected by threads; The side wall of the straight rod portion 1202 is provided with an external thread adapted to the nut 14 , and the internal thread of the nut 14 is meshed with the external thread of the straight rod portion 1202 , thereby realizing the loading and unloading of the nut 14 .

[0023] The cross section of the straight rod portion 1202 is circular, so that it is used to open a smooth external thread to achieve convenient assembly and disassembly of the nut 14.

[0024] Reference Figure 1 and Figure 4 The connection module 2 includes a connection rod 21, a first sleeve 22, a screw 23, a crimping ring 24, a second sleeve 25 and a rotating shaft 26. The inner cavity of the first sleeve 22 and the inner cavity of the second sleeve 25 are both circular hole-shaped structures and are coaxially arranged. The first sleeve 22 and the second sleeve 25 are respectively fixedly mounted on the two ends of the connection rod 21 (for example, fixedly connected by bolts, fixedly connected by an integral type or fixedly connected by welding); the screw 23 is inserted into the first sleeve 22 and connected by threads. The inner wall of the first sleeve 22 is provided with an internal thread adapted to the external thread of the screw 23, and the internal thread of the first sleeve 22 is meshed with the external thread of the screw 23, so that the relative rotation of the screw 23 and the first sleeve 22 can make the screw 23 move relative to the axial direction of the first cylinder, thereby adjusting the distance between the two clamping modules 1.

[0025] Reference Figure 1 and Figure 4 The crimping ring 24 is fixedly mounted on the top of the screw rod 23 (for example, by bolts, integral fixing or welding), and the crimping ring 24 is placed above the upper support plate 11. The rotating shaft 26 is inserted and arranged in the second sleeve 25 and is rotatably connected.

[0026] Reference Figure 1 and Figure 4 Since the first sleeve 22 and the second sleeve 25 are fixedly mounted at both ends of the connecting rod 21, the first sleeve 22, the second sleeve 25 and the connecting rod 21 can rotate synchronously at the same speed and in the same direction with the screw 23 and the rotating shaft 26 as the center, because the user can easily drive the first sleeve 22 and the second sleeve 25 to rotate by rotating the connecting rod 21.

[0027] Reference Figure 2 The support plate 11 is provided with a first plug hole 111. A first plug hole 111 is respectively provided at both ends of the same support plate 11, so as to be used for the installation of the pull-connection module 2.

[0028] Reference Figure 1 , Figure 2 and Figure 4 The screw rod 23 is inserted into the first insertion hole 111 of the upper clamping module 1; the rotating shaft 26 is inserted into the first insertion hole 111 of the lower clamping module 1. Since the first sleeve 22 and the second sleeve 25 are coaxially arranged, the screw rod 23 and the rotating shaft 26 are coaxially arranged, thereby realizing the smooth rotation of the first sleeve 22, the second sleeve 25 and the connecting rod 21.

[0029] Reference Figure 4 and Figure 7 The main reinforcement jacking device of the pile foundation steel cage also includes a limiting rod 3 for inserting and limiting the two crimping rings 24. The limiting rod 3 is inserted into the two crimping rings 24, and the two crimping rings 24 are simultaneously sleeved on the surface of the limiting rod 3, so that the crimping rings 24 and the screw rod 23 can be limited, so that when the user rotates the connecting rod 21, the screw rod 23 and the crimping ring 24 are prevented from rotating synchronously with the first sleeve 22 under the action of the friction force at the thread position, thereby realizing the relative rotation of the screw rod 23 and the first sleeve 22 to change the spacing between the two clamping modules 1.

[0030] Reference Figure 5 and Figure 6 The side wall of the pressing block 13 close to the bending portion 1201 is provided with an abutting protrusion 132, and the abutting protrusion 132 is provided with an abutting arc surface 133. The abutting protrusion 132 is fixedly connected to the pressing block 13 (for example, by an integral fixed connection, by a fixed connection by welding, or by a fixed connection by bolts); the abutting arc surface 133 is arranged at a position of the abutting protrusion 132 away from the side wall of the pressing block 13, so that the sleeve rod 12 and the abutting arc surface 133 can stably clamp the main rib 4 from both sides. Compared with the plane contact, the abutting arc surface 133 can increase the contact area between the abutting protrusion 132 and the main rib 4, thereby increasing the friction force and further improving the clamping stability.

[0031] The surface of the abutting arc surface 133 is integrally fixedly connected with a plurality of protrusions. When clamping the main rib 4, the protrusions can further increase the friction between the abutting protrusions 132 and the main rib 4 to improve the clamping stability and avoid slipping failure.

[0032] Reference Figure 4 The pull rods 21 are arranged in pairs; the top ends of the two pull rods 21 in a pair are fixedly mounted on the two side walls of the first sleeve 22, and the bottom ends of the two pull rods 21 in a pair are fixedly mounted on the two side walls of the second sleeve 25.

[0033] Reference Fig. 9The main reinforcement jacking device of the pile foundation steel cage also includes a pry bar 5, and a plug-in gap for accommodating the end of the pry bar 5 is provided between the two paired tie rods 21. When the friction between the screw 23 and the first sleeve 22 is too large, causing the user to be unable to grab the crimping ring 24 and rotate it: the user inserts one end of the pry bar 5 into the plug-in gap, and then rotates the other end of the pry bar 5, and can use the lever principle to conveniently and easily rotate the tie rod 21, further driving the first sleeve 22 and the screw 23 to rotate relative to each other, thereby adjusting the distance between the two clamping modules 1, so that the upper main reinforcement 41 and the lower main reinforcement 42 are close to each other.

[0034] Reference Figure 2 The bent portion 1201 of the sleeve rod 12 is placed at a corner of the inner wall of the support plate 11 and is fixedly connected to the support plate 11 (for example, by an integrated fixed connection, by welding, or by bolts).

[0035] Reference Figure 2 The two straight rods 1202 on the same sleeve rod 12 are arranged parallel to each other; each pressing block 13 is provided with two parallel insertion holes 131; the insertion holes 131 are circular in cross section. The two straight rods 1202 are respectively inserted into the two insertion holes 131 and fit through clearance, so that the pressing block 13 can slide smoothly on the straight rod 1202 along the axial direction of the straight rod 1202.

[0036] Reference Figure 1 The two connecting modules 2 are arranged parallel to each other, thereby reducing the bending moment borne by the first sleeve 22 and the screw rod 23 and improving the service life of the present invention.

[0037] Reference Figure 1 and Figure 4 A first retaining ring 261 and a second retaining ring 262 are fixedly installed at the top and bottom ends of the rotating shaft 26 (for example, fixedly connected by shrinkage, fixedly connected by welding, or fixedly connected by threads); the first retaining ring 261 is placed above the second sleeve 25, and the second retaining ring 262 is placed below the support plate 11 below, thereby preventing the second sleeve 25 and the support plate 11 below from disengaging.

[0038] Reference Figure 2 , Figure 7 and Figure 8 The main reinforcement 4 in the pile foundation reinforcement cage is usually arranged in a circular array, so the outer side of the main reinforcement 4 has a larger operating space than the inner side, which is beneficial for users to operate the present invention; and because the sleeve gap 121 is located at the corner position of the inner wall of the L-shaped support plate 11, when the target main reinforcement 4 is located in the sleeve gap 121, the outer end of the support plate 11 gives way to the adjacent main reinforcement 4, so that users have sufficient space to load and unload and adjust the pressing block 13, the nut 14 and the limit rod 3, and operate the pry bar 5.

[0039] A construction method for a main reinforcement tightening device for a pile foundation reinforcement cage, comprising the following steps: S1, placing the upper main reinforcement 41 and the lower main reinforcement 42 in the sleeve gap 121 of the upper and lower sleeve rods 12 respectively; S2, respectively sleeve the two pressing blocks 13 on the upper and lower sleeve rods 12; S3, screwing a plurality of nuts 14 onto the upper and lower sleeve rods 12 respectively, so that the upper sleeve rod 12 and the pressing block 13 clamp the upper main rib 41, and the lower sleeve rod 12 and the pressing block 13 clamp the lower main rib 42; S4, the user manually grabs and rotates the crimping ring 24, thereby driving the screw 23 to rotate relative to the first sleeve 22, so that the two clamping modules 1 approach each other, and driving the upper main rib 41 and the lower main rib 42 to approach each other; S5. The user manually grabs or uses the pry bar 5 to rotate the two crimping rings 24 until the two crimping rings 24 are in a coaxial position, and inserts the limit rod 3 into the two crimping rings 24; S6. Use the pry bar 5 to rotate the connecting rod 21, so that the two clamping modules 1 are close to each other, and the lower end surface of the upper main rib 41 and the upper end surface of the lower main rib 42 are close to each other until they are tightly pressed together; S7. Rotate the steel sleeve 43 disposed at the bottom end of the upper main reinforcement 41 so that the steel sleeve 43 moves downward along the axial direction of the upper main reinforcement 41; while the steel sleeve 43 moves downward, the first internal thread rotates and engages with the second external thread at the top end of the lower main reinforcement 42 until it is tightened, thereby achieving a fixed connection among the upper main reinforcement 41, the lower main reinforcement 42 and the steel sleeve 43, thereby improving the structural strength of the pile foundation and ensuring the construction quality.

[0040] During step S1, when installing the upper main reinforcement 41 and the lower main reinforcement 42, the outer end of the support plate 11 is directed toward the outside of the main reinforcement 4 of the steel cage, so that the outer end of the support plate 11 makes way for the remaining main reinforcement 4 to avoid structural conflict.

[0041] Reference Fig.10 The end sleeve of the limit rod 3 is fixed with a magnetic ring 31 (for example, a fixed connection is achieved by bolts); the crimping ring 24 is made of ferrous metal material (for example, 45# steel), and the magnetic ring 31 is made of permanent magnetic material (for example, Al-Ni-Co permanent magnetic alloy, Fe-Cr-Co permanent magnetic alloy, permanent magnetic ferrite, etc.). After the user inserts the limit rod 3 into the two crimping rings 24, the magnetic ring 31 is adsorbed on the end face of one of the crimping rings 24, thereby preventing the limit rod 3 from being accidentally pulled out of the crimping ring 24, ensuring construction safety.

[0042] Reference Figure 8 , Fig. 9 and Fig.11In step S6, the user inserts the end of the pry bar 5 into the crimping ring 24, and then rotates the other end of the pry bar 5 horizontally, so that the crimping ring 24 and the screw 23 can be rotated. The crimping ring 24 is located above the pull rod 21, so as to make way; and the outer end of the support plate 11 and the other main ribs 4 have already made way, so the maximum range of the horizontal rotation of the pry bar 5 (whether in the state of inserting the crimping ring 24 or the pull rod 21) is the fan-shaped R area, and the angle of the R area is greater than 180 degrees, so as to pry the crimping ring 24 or the pull rod 21 to perform a circular motion greater than 360 degrees, so as to adjust the distance between the two clamping modules 1.

[0043] Reference Figure 7 and Figure 8 Since the end of the support plate 11 extends outward from the gap between the target main reinforcement 4 and the adjacent main reinforcement 4, and the outermost end of the support plate 11 is placed outside the target main reinforcement 4, the two crimping rings 24 are both located outside the target main reinforcement 4, which can achieve the yielding of the target main reinforcement 4 and the limiting rod 3, avoid structural conflict, and provide space for the installation of the limiting rod 3.

[0044] The present invention has a simple structure and reliable functions. The clamping module 1 is used to limit the main reinforcement 4, and the coaxial setting (i.e. alignment) of the upper main reinforcement 41 and the lower main reinforcement 42 is achieved. The pulling module 2 is used to adjust the spacing between the two clamping modules 1, thereby indirectly controlling the upper main reinforcement 41 and the lower main reinforcement 42 to approach each other until they are tight, and then the steel sleeve 43 is rotated downward to engage the second external thread at the top of the lower main reinforcement 42, so as to achieve the mutual fixed connection between the upper main reinforcement 41, the lower main reinforcement 42 and the steel sleeve 43. The present invention can ensure that the main reinforcement 4 of the steel cage is integrally connected without empty positions, meet the construction requirements, improve the engineering quality, and can be widely used in pile foundation projects of various types of bridges.

[0045] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "up", "down", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0046] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, it can be a mechanical connection, it can be an electrical connection, it can be a direct connection, it can be connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] To sum up, for those skilled in the art, according to the guidance of the present invention, without departing from the principles and spirit of the present invention, the changes, modifications, substitutions and deformations made to the present invention still fall within the protection scope of the present invention.

Claims

1. A main reinforcement tightening device for a pile foundation reinforcement cage, characterized in that: It comprises two clamping modules (1) and a pulling and connecting module (2) for adjusting the distance between the two clamping modules (1); the clamping modules (1) are arranged one above the other and parallel to each other; the pulling and connecting modules (2) are provided with two and are respectively connected to two ends of the clamping modules (1); The clamping module (1) comprises a support plate (11), a sleeve rod (12), a pressure block (13) and a nut (14); the support plate (11) is an L-shaped plate-like structure, the sleeve rod (12) is an N-shaped rod-like structure, and the support plate (11) and the sleeve rod (12) are fixedly connected in a "Jie" shape; the sleeve rod (12) comprises a bending portion (1201) and straight rod portions (1202) arranged at both ends of the bending portion (1201); a sleeve gap (121) for accommodating a main rib (4) is provided at an inner wall of the bending portion (1201); the pressure block (13) is provided with an insertion hole (131), and the straight rod portion (1202) is inserted into the insertion hole (131) and slidably connected; the nut (14) is sleeved on the surface of the straight rod portion (1202) and is connected by a thread; The connecting module (2) comprises a connecting rod (21), a first sleeve (22), a screw rod (23), a crimping ring (24), a second sleeve (25) and a rotating shaft (26); the first sleeve (22) and the second sleeve (25) are respectively fixedly mounted on two ends of the connecting rod (21); the screw rod (23) is inserted into the first sleeve (22) and connected via a thread; the crimping ring (24) is fixedly mounted on the top end of the screw rod (23); the rotating shaft (26) is inserted into the second sleeve (25) and is rotatably connected; The support plate (11) is provided with a first plug hole (111); The screw rod (23) is inserted into the first insertion hole (111) of the upper clamping module (1); and the rotating shaft (26) is inserted into the first insertion hole (111) of the lower clamping module (1).

2. The main reinforcement tightening device for pile foundation steel cage according to claim 1 is characterized in that: It also includes a limiting rod (3) for inserting and limiting the two crimping rings (24).

3. The main reinforcement tightening device for pile foundation steel cage according to claim 2 is characterized in that: The side wall of the pressing block (13) close to the bending portion (1201) is provided with an abutment protrusion (132), and the abutment protrusion (132) is provided with an abutment arc surface (133).

4. The main reinforcement tightening device for pile foundation steel cage according to claim 3 is characterized in that: The connecting rods (21) are arranged in pairs; the top ends of the two connecting rods (21) in a pair are fixedly mounted on the two side walls of the first sleeve (22), and the bottom ends of the two connecting rods (21) in a pair are fixedly mounted on the two side walls of the second sleeve (25).

5. The main reinforcement tightening device for pile foundation reinforcement cage according to claim 4 is characterized in that: It also comprises a pry bar (5), and a plug-in gap for accommodating the end of the pry bar (5) is provided between the two paired pull rods (21).

6. The main reinforcement jacking device for pile foundation reinforcement cage according to claim 5 is characterized in that: The bent portion (1201) of the sleeve rod (12) is disposed at a corner position of the inner wall of the support plate (11) and is fixedly connected to the support plate (11).

7. The main reinforcement tightening device for pile foundation reinforcement cage according to claim 6 is characterized in that: The two straight rod portions (1202) on the same sleeve rod (12) are arranged parallel to each other.

8. The main reinforcement jacking device for pile foundation reinforcement cage according to claim 7 is characterized in that: The two pulling modules (2) are arranged parallel to each other.

9. The main reinforcement tightening device for pile foundation reinforcement cage according to claim 8 is characterized in that: A first retaining ring (261) and a second retaining ring (262) are fixedly mounted at the top and bottom ends of the rotating shaft (26), respectively; the first retaining ring (261) is placed above the second sleeve (25), and the second retaining ring (262) is placed below the supporting plate (11).

10. A construction method for the pile foundation reinforcement cage main reinforcement tightening device according to claim 5, characterized in that the steps include: S1, placing the upper main rib (41) and the lower main rib (42) in the sleeve gap (121) of the upper and lower sleeve rods (12), respectively; S2, sleeve-connecting the two pressing blocks (13) onto the upper and lower sleeve rods (12) respectively; S3, screwing a plurality of nuts (14) onto the upper and lower sleeve rods (12) respectively, so that the upper sleeve rod (12) and the pressing block (13) clamp the upper main rib (41), and the lower sleeve rod (12) and the pressing block (13) clamp the lower main rib (42); S4, rotating the crimping ring (24) to move the two clamping modules (1) closer to each other, thereby driving the upper main rib (41) and the lower main rib (42) closer to each other; S5, rotating the two crimping rings (24) until they are in a coaxial position, and inserting the limiting rod (3) into the two crimping rings (24); S6. Use the pry bar (5) to rotate the connecting rod (21) so that the two clamping modules (1) are moved closer to each other, thereby driving the upper main rib (41) and the lower main rib (42) to move closer to each other until the upper main rib (41) and the lower main rib (42) are pressed against each other.

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