A convenient and synchronous method for erecting and dismantling shear wall casting formwork on both sides of an expansion joint

Abstract

The present invention discloses a convenient and synchronous erection and dismantling method for shear wall casting formwork on both sides of an expansion joint, which solves the technical difficulties in erecting and reinforcing the outer formwork of the concrete casting wall on both sides of the expansion joint; for the shear wall casting formwork on both sides of the expansion joint, a synchronous and simultaneous erection method is adopted, and on-site operators can complete the synchronous erection and reinforcement of the concrete casting formwork of the wall on both sides of the expansion joint at the front outer side, rear outer side and upper position of the expansion joint. The specific process is: a nut with a larger aperture is welded to one end of the tension bolt for fixing the inner and outer formwork of the traditional precast wall, the tension bolt connection holes on the inner and outer formworks are enlarged so that the nuts with larger apertures can pass through, and a PVC pipe is arranged between the corresponding tension bolt through holes of the inner and outer formworks, and the PVC pipe and the two tension bolt through holes form an independent space channel isolated from the precast wall space.

Description

Technical Field

[0001] The invention relates to a shear wall casting template system on both sides of a building expansion joint, and in particular to a template system capable of realizing synchronous erection of shear wall templates on both sides of the expansion joint. Background Art

[0002] For long cast-in-situ concrete shear wall structures, expansion joints are generally provided to absorb the prestress of the concrete of the cast-in-situ building. When pouring the walls on both sides of the expansion joint, it is necessary to set up the outer formwork of the walls on both sides. Since the expansion joint reserved between the two pre-cast walls is only about 20 cm wide, it is very difficult to set up and reinforce the outer formwork of the wall. The existing technology is to complete the construction of the outer formwork in the following two ways: (1) filling the expansion joint with foam board and using the foam board to replace the outer formwork on both sides of the expansion joint. Since the foam board has low strength, it is easy to cause the foam board to shift during the concrete pouring process of the wall, causing quality problems of the walls poured on both sides of the expansion joint; (2) using the staggered casting construction method of the shear walls on both sides. Although this method solves the problem of the difficulty in setting up and reinforcing the outer formwork on the expansion joint side that is poured first, the formwork on the other side of the wall that is poured later is still difficult to support and reinforce, and it also prolongs the construction period. How to conveniently and high-quality set up and reinforce the formwork on both sides of the expansion joint has become a problem that needs to be solved on site. Summary of the Invention

[0003] The present invention provides a convenient and synchronous method for erecting and dismantling shear wall casting formwork on both sides of an expansion joint, which solves the technical problem of difficulty in erecting and reinforcing the outer formwork of the concrete casting wall on both sides of the expansion joint.

[0004] The present invention solves the above technical problems through the following technical solutions:

[0005] The overall concept of the present invention is as follows: for the shear wall casting formwork on both sides of the expansion joint, a method of synchronous and simultaneous erection is adopted. On-site operators can complete the synchronous erection and reinforcement of the wall concrete casting formwork on both sides of the expansion joint at the front outside, rear outside and upper positions of the expansion joint. The specific process is: a nut with a larger aperture is welded to one end of the tension bolt of the traditional fixed precast wall inner and outer formwork, the tension bolt connection hole on the inner and outer formwork is enlarged so that the nut with a larger aperture can pass through, and a PVC pipe is arranged between the corresponding tension bolt through holes of the inner and outer formworks. The PVC pipe and the two tension bolt through holes form an independent space channel isolated from the precast wall space; the operator passes the nut with a larger aperture on the modified tension bolt from the inside of the building through the tension bolt connection hole of the inner formwork, the PVC pipe, and the outer formwork through hole in turn, and extends it to the expansion joint. The contraction joint is formed by making the opening directions of the nuts with larger apertures consistent, and clamping square timbers are set on the inner and outer formworks. The operator inserts a steel bar into each nut with larger apertures in turn on the front or rear outside of the building where the expansion joint is located, and tightens the nuts through the butterfly clips and tension bolts covered on the outer surface of the formwork inside the building. The modified tension bolts are pulled toward the building interior, so that the steel bars in the nuts with larger apertures on the modified tension bolts are pressed against the square timbers on the outer formworks, thereby fixing the formworks on both sides of the precast wall. After the concrete poured into the wall has solidified, it is only necessary to remove the butterfly clips and nuts on the inner formworks to remove the pressing force between the steel bars in the nuts with larger apertures in the expansion joints and the square timbers on the outer formworks, and pull out the steel bar from the front or rear outside of the expansion joints. The inner and outer formworks and tension bolts can be easily removed for reuse.

[0006] A method for conveniently and synchronously erecting and dismantling shear wall casting templates on both sides of an expansion joint comprises: arranging a cast-complete wall on one side of the expansion joint, arranging another cast-complete wall on the other side of the expansion joint, pre-embedding lower pre-embedded screw sleeves at intervals along the front-to-back direction of the expansion joint on the top outer facade of the cast-complete wall, and pre-embedding another lower pre-embedded screw sleeve at intervals along the front-to-back direction of the expansion joint on the top outer facade of the cast-complete wall on the other side; the method is characterized by the following steps:

[0007] The first step is to weld a nut with a larger diameter to the outer end of the tension bolt; set a through hole for the outer side of the tension bolt on the outer formwork of the wall casting, and set a through hole for the inner side of the tension bolt on the inner formwork of the wall casting, and process a PVC pipe with a length equal to the thickness of the precast wall, and make the inner diameter of the PVC pipe larger than the outer diameter of the nut;

[0008] The second step is to install the longitudinal horizontal support wood strips on the outer facade of the top of the completed wall. The longitudinal horizontal support wood strips are fixed by screwing the wood strip fixing bolts with the lower embedded screw sleeves; on the outer facade of the top of the completed wall on the other side, the second longitudinal horizontal support wood strips are installed thereon simultaneously;

[0009] Step 3: Place the outer wall casting formwork on the top surface of the longitudinal horizontal supporting wooden strip, set the inner wall casting formwork on the top surface of the already cast wall inside the outer wall casting formwork, set an inner support rod between the outer wall casting formwork and the inner wall casting formwork, set a PVC pipe between the outer through-hole of the tension bolt and the inner through-hole of the tension bolt, the outer through-hole of the tension bolt, the inner through-hole of the tension bolt and the PVC pipe form a closed channel, and the channel and the pre-cast wall concrete space are separated into two spaces by the PVC pipe; at the same time, on the second longitudinal horizontal supporting wooden strip and the top surface of the already cast wall on the other side, set up the concrete casting formwork of the other pre-cast wall on the other side of the already cast wall using the same method as above;

[0010] The fourth step is to pass the nuts welded on the outer ends of the tension bolts through the through holes on the inner sides of the tension bolts, the PVC pipes and the through holes on the outer sides of the tension bolts from the top surface of the cast wall inner formwork. The nuts are extended to the outside of the cast wall outer formwork, and the center lines of the nuts welded on the outer ends of the tension bolts are made to coincide in the front and rear horizontal directions. A steel bar is inserted into the nuts welded on the outer ends of the tension bolts. The steel bar is inserted from the outside of the building on the front side of the expansion joint. The steel bars are arranged at intervals between the steel bars and the cast wall outer formwork. The outer wooden slats are arranged in the direction of the outer wooden slats, and inner fixing nuts and butterfly clamps are respectively provided at the inner side ends of the tension bolts. Two horizontal steel pipes are clamped in the butterfly clamps. The inner wooden slats in the upper and lower directions are arranged between the two horizontal steel pipes and the inner formwork for wall casting. By rotating the inner fixing nuts, the steel bars are pressed tightly against the outer wooden slats, and the two horizontal steel pipes are pressed tightly against the inner wooden slats. Thus, the steel bars, the outer wooden slats, the outer formwork for wall casting, the inner support rods, the inner formwork for wall casting, the inner wooden slats and the two horizontal steel pipes are fixed together by the tension bolts to obtain a stable wall casting formwork system;

[0011] At the same time, the same method as above is used to fix the formwork system of the precast wall on the other side of the completed wall.

[0012] Step 5: Set an upper embedded screw sleeve on the inner side of the top of the outer formwork for wall casting, so that the outer end of the upper embedded screw sleeve is buckled on the inner facade of the outer formwork for wall casting, and fix the upper embedded screw sleeve on the embedded steel bars in the wall; use the same method to set another upper embedded screw sleeve in the formwork system of the precast wall on the other side;

[0013] Step 6: Pour the wall concrete on both sides of the expansion joint at the same time to complete the synchronous construction of the two walls.

[0014] Step 7: After the wall concrete on both sides of the expansion joint has finally set, loosen the fixing nuts to cancel the clamping force of the steel bars on the outer wood slats, and cancel the clamping force of the two horizontal steel pipes on the inner wood slats, pull the outer wood slats upward, and then pull the steel bars out from the front side of the expansion joint;

[0015] Step 8. Pull out the tension bolts from the inside of the inner formwork of the wall casting. Finally, remove the outer formwork of the wall casting from above the expansion joint to complete the disassembly of the formwork on one side of the wall; use the same method to complete the disassembly of the wall formwork on the other side.

[0016] A construction template system for a material transfer opening on a floor slab comprises a floor slab casting bottom template, on which an integral frame-type mold is arranged; the integral frame-type mold is composed of a square upper frame made of steel plates and a square trumpet-shaped lower frame fixedly connected; a "7"-shaped lower steel plate is fixedly connected to the lower end of each vertical plate of the square upper frame, the lower end of the vertical plate is fixedly welded to the outer end of the top surface of the horizontal plate of the "7"-shaped lower steel plate, the four "7"-shaped lower steel plates form a closed trumpet-shaped square trumpet-shaped lower frame, and the horizontal plates of the four "7"-shaped lower steel plates form a closed square step arranged in the frame; haunch steel bars are evenly welded on the outer facade of each vertical plate of the square upper frame and the outer inclined surface of the "7"-shaped lower steel plate; floor slab concrete is poured on the outer side of the integral frame-type mold, and the haunch steel bars are pre-embedded in the poured floor slab concrete.

[0017] Embedded steel bar brackets are welded at intervals on the square steps.

[0018] A blocking template system for material transfer holes on floor slabs includes an integral frame mold; the integral frame mold is composed of a square upper frame made of steel plates and a square trumpet lower frame welded together; a "7"-shaped lower steel plate is fixedly connected to the lower end of each vertical plate of the square upper frame; the lower end of the vertical plate is fixedly welded to the outer end of the top surface of the horizontal plate of the "7"-shaped lower steel plate; four "7"-shaped lower steel plates form a closed trumpet-shaped square trumpet lower frame; the horizontal plate of each "7"-shaped lower steel plate is arranged in the frame to form a closed square step; On the surface, as well as on the outer inclined surface of the "7"-shaped lower steel plate, armpit steel bars are evenly welded; on the outer side of the integral frame mold, floor slab concrete is poured, and the armpit steel bars are embedded in the floor slab concrete; embedded steel bar brackets are welded at equal intervals on the square steps, and hole-sealing embedded steel bars are arranged between the corresponding two embedded steel bar brackets. A hanging mold support beam is provided at the top of the integral frame mold, and a hole-sealing concrete pouring bottom template is provided on the lower port of the integral frame mold. A hanging mold steel wire is connected between the hole-sealing concrete pouring bottom template and the hanging mold support beam.

[0019] A hole is provided in the inner cavity of the integral frame-shaped mold to seal the secondary concrete pouring.

[0020] A convenient construction method for a material transfer opening on a floor slab comprises a floor slab casting bottom formwork and an integral frame mold; the method is characterized by the following steps:

[0021] The first step is to make an integral frame mold according to the thickness of the precast floor slab and the size of the square material transfer opening. The integral frame mold is composed of a square upper frame and a square trumpet lower frame connected together; make four rectangular steel plates of the same size as the vertical plates of the square upper frame, and splice and weld them to form a square upper frame; make four "7"-shaped lower steel plates, and fix a "7"-shaped lower steel plate on the lower end of each vertical plate of the square upper frame, and weld the lower end of the vertical plate to the outer end of the top surface of the horizontal plate of the "7"-shaped lower steel plate. The four "7"-shaped lower steel plates form a closed square trumpet, and the horizontal plate of the "7"-shaped lower steel plate is set in the frame to form a closed square step; on the outer facade of each vertical plate of the square upper frame, and on the outer inclined surface of the "7"-shaped lower steel plate, evenly weld and add haunch steel bars;

[0022] Step 2: Position and fix the integral frame mold processed in the first step at the reserved hole on the bottom template for pouring the floor slab;

[0023] The third step is to pour the floor slab concrete outside the integral frame mold and embed the haunch reinforcement in the floor slab concrete;

[0024] Step 4: After the concrete of the floor slab to be poured has finally set, the integral frame mold is tightly combined with the floor slab concrete to form a material transfer hole on the floor slab.

[0025] A reliable sealing method for material transfer openings on floor slabs comprises providing an integral frame-shaped mold on a floor slab casting bottom template; the integral frame-shaped mold is composed of a square upper frame made of steel plates and a square trumpet-shaped lower frame connected together; a "7"-shaped lower steel plate is fixedly connected to the lower end of each vertical plate of the square upper frame, the lower end of the vertical plate is welded to the outer end of the top surface of the horizontal plate of the "7"-shaped lower steel plate, the four "7"-shaped lower steel plates form a closed square trumpet, and the horizontal plate of the "7"-shaped lower steel plate is arranged in the frame to form a closed square step; haunch steel bars are uniformly welded on the outer facade of each vertical plate of the square upper frame and the outer inclined surface of the "7"-shaped lower steel plate; floor slab concrete is poured on the outer side of the integral frame-shaped mold, and the haunch steel bars are pre-embedded in the poured floor slab concrete; the method is characterized by the following steps:

[0026] The first step is to set the hole-blocking embedded steel bars between the corresponding two embedded steel bar brackets on the square steps to construct the hole-blocking embedded steel bar mesh;

[0027] Step 2: Install a mold hanging support beam on the upper port of the integral frame mold;

[0028] Step 3: Set a bottom template for pouring concrete to seal the hole under the material transfer hole on the floor slab, so that the side ends of the bottom template are connected to the bottom surface of the floor slab outside the material transfer hole on the floor slab; connect the hanging formwork steel wire between the bottom template for pouring concrete to seal the hole and the hanging formwork support beam, and fix the bottom template for pouring concrete to seal the hole to seal the hole on the lower end of the material transfer hole on the floor slab;

[0029] Step 4: Pour secondary sealing concrete into the inner cavity of the integral frame mold, and pour the integral frame mold into the floor slab to completely seal the material transfer hole on the floor slab;

[0030] Step 5. After the secondary sealing concrete to be poured has finally set, cut the hanging formwork steel wire below the bottom formwork for the hole sealing concrete pouring, and then remove the bottom formwork for the hole sealing concrete pouring; at the same time, disconnect the hanging formwork steel wire from the hanging formwork support beam on the floor slab, and remove the hanging formwork support beam.

[0031] The present invention realizes the synchronous and simultaneous erection of shear wall casting templates on both sides of the expansion joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of the present invention;

[0033] Figure 2 This is a schematic diagram of the connection structure of the longitudinal horizontal supporting strips 4 of the present invention;

[0034] Figure 3 This is a schematic structural diagram of the shear walls on both sides of the expansion joint of the present invention when being cast;

[0035] Figure 4 It is a structural schematic diagram of the shear wall casting templates on both sides of the expansion joint of the present invention after being removed. DETAILED DESCRIPTION

[0036] The present invention is described in detail below with reference to the accompanying drawings:

[0037] A method for conveniently and synchronously erecting and dismantling shear wall casting templates on both sides of an expansion joint, comprising: arranging a cast-complete wall on one side of the expansion joint 1, arranging another cast-complete wall on the other side of the expansion joint 1, pre-embedding lower pre-embedded screw sleeves 3 at intervals along the front-to-back direction of the expansion joint 1 on the top outer facade of the cast-complete wall, and pre-embedding another lower pre-embedded screw sleeve at intervals along the front-to-back direction of the expansion joint 1 on the top outer facade of the other side of the cast-complete wall; characterized by the following steps:

[0038] The first step is to weld a nut 14 to the outer end of the tension bolt 13; set the outer through-hole 7 of the tension bolt on the outer wall casting formwork 6, and set the inner through-hole 9 of the tension bolt on the inner wall casting formwork 8. Process a PVC pipe 10 with a length equal to the thickness of the precast wall, and make the inner diameter of the PVC pipe 10 larger than the outer diameter of the nut 14;

[0039] The second step is to install the longitudinal horizontal support strip 4 on the outer facade of the top of the cast wall. The longitudinal horizontal support strip 4 is fixed by screwing the strip fixing bolt 5 with the lower embedded screw sleeve 3; on the outer facade of the top of the cast wall on the other side, the second longitudinal horizontal support strip 22 is installed thereon simultaneously;

[0040] The third step is to place the wall casting outer formwork 6 on the top surface of the longitudinal horizontal supporting wooden strip 4, set the wall casting inner formwork 8 on the top surface of the cast wall inside the wall casting outer formwork 6, set the inner support rod 12 between the wall casting outer formwork 6 and the wall casting inner formwork 8, and set a PVC pipe 10 between the outer through-hole 7 of the tension bolt and the inner through-hole 9 of the tension bolt. The outer through-hole 7 of the tension bolt, the inner through-hole 9 of the tension bolt and the PVC pipe 10 form a closed channel, which is separated from the wall concrete pre-cast space 11 by the PVC pipe 10 into two spaces; at the same time, on the second longitudinal horizontal supporting wooden strip 22 and the top surface of the cast wall on the other side, use the same method as above to set up the concrete casting formwork of the other side of the cast wall on the other side;

[0041] The fourth step is to pass the nuts 14 welded on the outer ends of the tension bolts 13 through the through holes 9 on the inner side of the tension bolts, the PVC pipes 10 and the through holes 7 on the outer sides of the tension bolts 13 from the top surface of the cast wall on the side of the inner wall formwork 8, and extend them to the outside of the outer wall formwork 6, and make the center lines of the nuts 14 welded on the outer ends of the tension bolts 13 coincide in the front and rear horizontal directions; connect a steel bar 15 through the nuts 14 welded on the outer ends of the tension bolts 13, and the steel bar 15 is inserted from the outside of the building on the front side of the expansion joint 1; and arrange outer square wood slats in the upper and lower directions at intervals between the steel bar 15 and the outer wall formwork 6. 16. An inner fixing nut 17 and a butterfly clip 18 are respectively provided at the inner end of the tension bolt 13. Two horizontal steel pipes 19 are clamped in the butterfly clip 18. Inner square wood slats 20 are arranged in the upper and lower directions between the two horizontal steel pipes 19 and the inner wall casting formwork 8. By rotating the inner fixing nut 17, the steel bar 15 is pressed against the outer square wood slats 16, and the two horizontal steel pipes 19 are pressed against the inner square wood slats 20. Thus, the steel bar 15, the outer square wood slats 16, the outer wall casting formwork 6, the inner support rod 12, the inner wall casting formwork 8, the inner square wood slats 20 and the two horizontal steel pipes 19 are fixed together by the tension bolt 13, thereby obtaining a stable wall casting formwork system;

[0042] At the same time, the same method as above is used to fix the formwork system of the precast wall on the other side of the completed wall.

[0043] The fifth step is to set the upper embedded screw sleeve 23 on the inner side of the top of the wall casting outer template 6, so that the outer end of the upper embedded screw sleeve 23 is buckled on the inner facade of the wall casting outer template 6, and the upper embedded screw sleeve 23 is fixed to the embedded steel bar in the wall; using the same method, another upper embedded screw sleeve 24 is set in the template system of the precast wall on the other side;

[0044] Step 6: Pour the wall concrete on both sides of the expansion joint 1 at the same time to complete the synchronous construction of the two walls.

[0045] Step 7: After the wall concrete on both sides of the expansion joint 1 has finally set, loosen the fixing nuts 17 to cancel the clamping force of the steel bars 15 on the outer wooden planks 16, and cancel the clamping force of the two horizontal steel pipes 19 on the inner wooden planks 20, and then pull the outer wooden planks 16 out upwards. Then, pull the steel bars 15 out from the front side of the expansion joint 1;

[0046] Step 8. Pull out the tension bolts 13 from the inside of the inner wall formwork 8. Finally, remove the outer wall formwork 6 from above the expansion joint 1 to complete the disassembly of the formwork on one side of the wall; use the same method to complete the disassembly of the wall formwork on the other side.

Claims

1. A method for conveniently and synchronously erecting and dismantling shear wall casting templates on both sides of an expansion joint, comprising: arranging a cast-complete wall on one side of the expansion joint (1), arranging another cast-complete wall on the other side of the expansion joint (1), pre-embedding lower pre-embedded screw sleeves (3) at intervals along the front-back direction of the expansion joint (1) on the top outer side elevation of the cast-complete wall, and pre-embedding another lower pre-embedded screw sleeve at intervals along the front-back direction of the expansion joint (1) on the top outer side elevation of the cast-complete wall on the other side; characterized in that Follow these steps: The first step is to weld a nut (14) to the outer end of the tension bolt (13); set a through hole (7) for the outer side of the tension bolt on the outer wall casting template (6), set a through hole (9) for the inner side of the tension bolt on the inner wall casting template (8), and process a PVC pipe (10) with a length equal to the thickness of the precast wall, and make the inner diameter of the PVC pipe (10) larger than the outer diameter of the nut (14); The second step is to install a longitudinal horizontal support wood strip (4) on the outer facade of the top of the cast-finished wall. The longitudinal horizontal support wood strip (4) is fixed by screwing the wood strip fixing bolt (5) and the lower embedded screw sleeve (3); on the outer facade of the top of the cast-finished wall on the other side, a second longitudinal horizontal support wood strip (22) is installed thereon simultaneously; The third step is to place the wall casting outer formwork (6) on the top surface of the longitudinal horizontal supporting wood strip (4), set the wall casting inner formwork (8) on the top surface of the wall that has been cast inside the wall casting outer formwork (6), set the inner support rod (12) between the wall casting outer formwork (6) and the wall casting inner formwork (8), set the PVC pipe (10) between the outer through-hole (7) of the tension bolt and the inner through-hole (9) of the tension bolt, and form a closed channel with the outer through-hole (7) of the tension bolt, the inner through-hole (9) of the tension bolt and the PVC pipe (10), which is separated from the wall concrete pre-cast space (11) by the PVC pipe (10) into two spaces; at the same time, on the second longitudinal horizontal supporting wood strip (22) and the top surface of the other side of the cast wall, the concrete casting formwork of the other side of the cast wall on the other side is set up in the same way as above; The fourth step is to pass the nuts (14) welded on the outer ends of the tension bolts (13) through the through holes (9), PVC pipes (10) and the outer through holes (7) of the tension bolts (8) on the top surface of the completed wall on one side of the wall casting inner formwork (8), and extend them to the outside of the wall casting outer formwork (6), and make the center lines of the nuts (14) welded on the outer ends of the tension bolts (13) coincide in the front and rear horizontal directions; a steel bar (15) is inserted into the nuts (14) welded on the outer ends of the tension bolts (13), and the steel bar (15) is inserted from the outside of the building on the front side of the expansion joint (1); outer square wood slats (16) are arranged in the upper and lower directions between the steel bar (15) and the wall casting outer formwork (6), and inner fixing nuts ( 17) and butterfly card (18), two horizontal steel pipes (19) are clamped in the butterfly card (18), and inner square wood slats (20) are arranged in the upper and lower directions between the two horizontal steel pipes (19) and the wall casting inner template (8). By rotating the inner fixing nut (17), the steel bar (15) is pressed against the outer square wood slats (16), and the two horizontal steel pipes (19) are pressed against the inner square wood slats (20), thereby fixing the steel bar (15), the outer square wood slats (16), the wall casting outer template (6), the inner support rod (12), the wall casting inner template (8), the inner square wood slats (20) and the two horizontal steel pipes (19) together by the tension bolts (13) to obtain a stable wall casting template system; at the same time, the same method as above is used to complete the fixing of the template system of the precast wall on the other side of the cast wall on the other side.

2. A convenient and synchronous method for erecting and dismantling shear wall casting formwork on both sides of an expansion joint according to claim 1, characterized in that: The fifth step is to set the upper embedded screw sleeve (23) on the inner side of the top of the wall casting outer template (6), so that the outer end of the upper embedded screw sleeve (23) is buckled on the inner vertical surface of the wall casting outer template (6), and the upper embedded screw sleeve (23) is fixed to the embedded steel bar in the wall; using the same method, another upper embedded screw sleeve (24) is set in the template system of the precast wall on the other side; the sixth step is to simultaneously cast the wall concrete on both sides of the expansion joint (1) to complete the synchronous construction of the two walls.

3. A convenient and synchronous method for erecting and dismantling shear wall casting formwork on both sides of an expansion joint according to claim 2, characterized in that: Step 7: After the wall concrete on both sides of the expansion joint (1) has finally set, the fixing nut (17) is loosened to cancel the clamping force of the steel bar (15) on the outer wooden slats (16), and the clamping force of the two horizontal steel pipes (19) on the inner wooden slats (20) is canceled, and the outer wooden slats (16) are pulled out upwards, and then the steel bar (15) is pulled out from the front side of the expansion joint (1); Step 8: Pull out the tension bolts (13) from the inside of the inner wall casting formwork (8). Finally, remove the outer wall casting formwork (6) from above the expansion joint (1). Complete the disassembly of the formwork on one side of the wall after casting. Use the same method to complete the disassembly of the wall formwork on the other side.

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