Pipe gallery open excavation cast-in-place construction inner formwork and construction method thereof

Abstract

The invention provides a pipe gallery open excavation cast-in-place construction inner formwork and a construction method thereof.The pipe gallery open excavation cast-in-place construction inner formwork comprises a bottom plate and a plurality of outer formworks arranged in a foundation pit, the outer formworks are arranged on the two sides of the bottom plate, an inner formwork is arranged at the top of the bottom plate, inner formworks are arranged on the two sides of the inner formwork, and a top plate is arranged at the tops of the inner formworks; and a reinforcement cage is arranged between the inner template and the outer template. The pipe gallery inner formwork can be conveniently installed and separated, and is convenient to move, so that continuous construction of a pipe gallery is facilitated, and the efficiency is higher; in the pipe gallery construction process, operation is easy, connection and positioning of the inner formworks are simpler, and efficiency is higher; the adaptive capacity is good.

Description

Technical Field

[0001] The present invention relates to the technical field of utility tunnel construction, and particularly relates to an internal formwork for open-cut cast-in-place construction of a utility tunnel and a construction method thereof. Background Art

[0002] Open-cut cast-in-place construction of a utility tunnel is a common construction method for an underground utility tunnel, including the following construction process: First, construction preparation is carried out, and then the foundation pit is excavated according to the design requirements. According to the geological conditions and the excavation depth, a suitable excavation method and support method are selected.

[0003] Then, an internal formwork and an external formwork are installed in the foundation pit, and a steel reinforcement cage is fabricated. Then, concrete is poured, and after waiting for the concrete to solidify and cure, finally, the internal formwork and the external formwork are removed, and the foundation pit is backfilled, thus completing the construction of the utility tunnel.

[0004] However, in the existing method for constructing a utility tunnel, the external formwork is located on the outside of the utility tunnel, which is easy to construct and hoist. However, the internal formwork is located inside the utility tunnel. During the construction process, especially when the internal formwork is removed after the utility tunnel is formed, the operation is inconvenient and the efficiency is low, thus affecting the overall construction efficiency. Summary of the Invention

[0005] The main purpose of the present invention is to provide an internal formwork for open-cut cast-in-place construction of a utility tunnel and a construction method thereof, so as to solve the problems of inconvenient setting, inconvenient operation, and low construction efficiency of the internal formwork of the utility tunnel.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is: An internal formwork for open-cut cast-in-place construction of a utility tunnel, including a bottom plate and a plurality of external formworks arranged in a foundation pit, and the external formworks are arranged on both sides of the bottom plate: An internal formwork frame is provided on the top of the bottom plate, internal formworks are provided on both sides of the internal formwork frame, and a top plate is provided on the top of the internal formworks; A steel reinforcement cage is arranged between the internal formwork and the external formwork.

[0007] In a preferred solution, the internal formwork frame includes a bottom frame, and a plurality of rollers are provided on the side surface of the bottom frame, and the rollers are placed on the top of the bottom plate; A plurality of support rods are provided on the top of the bottom frame, and cross bars are arranged between adjacent support rods; A first hydraulic cylinder is arranged between the support rod and the internal formwork; A support plate is provided on the top of the support rod, and the top plate is located on the top of the support plate and the internal formwork; The length of the top plate is the same as the length of the internal formwork, and the side surface of the top plate close to the external formwork is in the same plane as the surface of the internal formwork close to the external formwork.

[0008] In a preferred solution, a plurality of second hydraulic cylinders are arranged between the support plate and the cross bar; A guide hole is provided at the top of the support rod, and a number of guide rods are provided at the bottom of the support plate. The guide rods slide and extend into the interior of the guide hole. Two second hydraulic cylinders are provided at the top of the same cross bar.

[0009] In a preferred embodiment, a number of positioning holes are provided at the top of the support plate. A number of positioning blocks are provided at the bottom of the top plate, and the positioning blocks are adapted to the positioning holes. The bottom surface area of the positioning block is smaller than the top surface area.

[0010] In a preferred embodiment, the inner formwork is provided with a positioning mechanism. The positioning mechanism includes a number of fixing seats fixedly connected to the inner formwork, and rotating blocks are provided on the upper and lower sides of the fixing seats. A positioning plate is provided on the side surface of the inner formwork, and the positioning plate is fixedly connected to the rotating block. The rotating block is fixedly connected with a rotating shaft, and the rotating shaft is rotatably connected to the interior of the fixing seat. A worm gear is provided on the rotating shaft. The fixing seat is provided with a motor, and a worm is provided on the output shaft of the motor. The worm meshes with the worm gear.

[0011] In a preferred embodiment, the rotating block is detachably connected to the positioning plate. The end of the positioning plate is provided with a plug-in block and a positioning rod, and both the plug-in block and the positioning rod extend into the interior of the rotating block. A connection hole adapted to the positioning rod is provided on the side surface of the rotating block, and a magnet is provided inside the connection hole. A fixing rod is also provided, which is adapted to the connection hole, and the length of the fixing rod is twice that of the connection hole.

[0012] In a preferred embodiment, the inner formwork is provided with a connection mechanism. The connection mechanism includes a number of connecting rods. One end of the connecting rod abuts against the outer formwork, and a limiting plate is provided at the other end. The limiting plate fits against the inner formwork. A number of plug-in holes are provided inside the inner formwork. A plug-in rod is provided on the side of the limiting plate away from the plug-in hole, and the plug-in rod is adapted to the plug-in hole. A number of connection grooves are provided on the side surface of the connecting rod, and the connection grooves connect the steel bars of the steel reinforcement cage.

[0013] A construction method for the inner formwork in the open-cut cast-in-place construction of a pipe gallery includes the following steps: S1. Excavate the foundation pit according to the designed route. S2. Set the outer formwork in the foundation pit, and pour a concrete cushion layer at the bottom of the foundation pit to form the bottom plate. S3. Move the inner formwork through the inner formwork frame. S4. Place the steel reinforcement cage between the inner formwork and the outer formwork, and pour concrete. S5. The concrete solidifies, and move the inner formwork to the next construction position through the inner formwork frame. S6. Repeat S4 - S5 until the construction of the pipe gallery is completed.

[0014] In the preferred solution, in S3, moving the inner formwork includes the following steps: S31. Drive the inner formwork away from the formed concrete pipe gallery by contracting the first hydraulic cylinder; S32. Push the inner formwork frame, and move it along the bottom plate to the next construction position through the rollers at the bottom of the inner formwork frame; S33. Place the steel reinforcement cage; S34. Drive the inner formwork to the expected position by extending the first hydraulic cylinder.

[0015] In the preferred solution, the steel reinforcement cage is a prefabricated steel reinforcement cage with the same size; In S4, placing the steel reinforcement cage includes the following steps: S41. Place the steel reinforcement cage on the bottom plate; S42. Use the connecting rod to connect with the steel reinforcement cage, and make the insertion rods at the end of the connecting rod correspond to the insertion holes inside the inner formwork one by one; S43. Drive the inner formwork to the side of the steel reinforcement cage by the inner formwork frame, and align the insertion rods with the insertion holes; S44. Move the inner formwork frame or the steel reinforcement cage to make the insertion rods enter the insertion holes.

[0016] The present invention provides an inner formwork for open - cut in - situ construction of a pipe gallery and its construction method. By adopting the above - mentioned solution, it has the following beneficial effects: 1. The inner formwork of the pipe gallery can be conveniently installed and separated, and is easy to move, thus facilitating the continuous construction of the pipe gallery and having higher efficiency.

[0017] 2. During the construction of the pipe gallery, the operation is simple, the connection and positioning of the inner formwork are simpler, and the efficiency is higher.

[0018] 3. It can be adjusted differently according to different construction requirements of the pipe gallery, and has good adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The following further describes the present invention in conjunction with the drawings and embodiments: Figure 1 is the structural schematic diagram of the present invention; Figure 2 is the structural schematic diagram of the present invention; Figure 3 is the top view of the present invention; Figure 4 is the front view of the present invention; Figure 5 is the structural schematic diagram of the inner formwork frame of the present invention; Figure 6It is a schematic structural diagram of the positioning mechanism described in the present invention; Figure 7 It is a schematic sectional structural diagram of the positioning mechanism described in the present invention; Figure 8 It is a schematic structural diagram of the connection mechanism described in the present invention; Figure 9 It is a schematic structural diagram of an embodiment of the positioning mechanism described in the present invention; Figure 10 It is a schematic structural diagram of an embodiment of the positioning mechanism described in the present invention.

[0020] In the figure: Base plate 1, outer template 101, inner mold frame 2, bottom frame 201, roller 202, support rod 203, support plate 204, first hydraulic cylinder 205, cross bar 206, second hydraulic cylinder 207, guide rod 208, guide hole 209, inner template 3, top plate 4, positioning block 401, positioning hole 402, positioning mechanism 5, fixed seat 501, rotating block 502, positioning plate 503, motor 504, worm 505, rotating shaft 506, worm gear 507, plug-in block 508, positioning rod 509, magnet 510, fixed rod 511, connection mechanism 6, connecting rod 601, limiting plate 602, plug-in hole 603, plug-in rod 604, connection groove 605. Detailed implementation manners

[0021] Embodiment 1: As Figure 1 , 2 , 3, 4, 5, 6, 7 and 8 show, an in-situ cast inner formwork for open cut construction of pipe gallery, including a base plate 1 arranged in a foundation pit and a plurality of outer templates 101. The base plate 1 is a concrete cushion formed by concrete pouring. The outer templates 101 are arranged on both sides of the base plate 1. The outer templates 101 are the common outer template structures in the existing pipe gallery construction process, and are fixed and transported in the existing manner, so they will not be elaborated here: The top of the base plate 1 is provided with an inner mold frame 2. The two sides of the inner mold frame 2 are provided with inner templates 3. The inner mold frame 2 includes a bottom frame 201. A plurality of rollers 202 are arranged on the side surface of the bottom frame 201, and the rollers 202 are placed on the top of the base plate 1; A plurality of support rods 203 are arranged on the top of the bottom frame 201, and a cross bar 206 is arranged between adjacent support rods 203; A first hydraulic cylinder 205 is arranged between the support rod 203 and the inner template 3. The first hydraulic cylinder 205 is an existing hydraulic cylinder, externally connected to an existing hydraulic system, and controlled in the existing manner; During use, the foundation pit is excavated in the existing manner, then the base plate 1 is poured and the outer template 101 is installed, then the inner mold frame 2 and the connected inner template 3 are hoisted onto the base plate 1 as a whole, then the position of the inner mold frame 2 is adjusted through the rollers 202, and then the position of the inner template 3 is adjusted through the first hydraulic cylinder 205, and the operation is simple.

[0022] Further, a support plate 204 is provided at the top of the support rod 203, and a top plate 4 is provided on the support plate 204 and the top of the inner formwork 3. The length of the top plate 4 is the same as that of the inner formwork 3. The side surface of the top plate 4 close to the outer formwork 101 is in the same plane as the surface of the inner formwork 101 close to the outer formwork 101. During use, the top plate 4 is set according to the actual size of the actual pipe gallery. After the positions of the inner formwork 3 and the inner formwork frame 2 are fixed, the top plate 4 is placed on the top of the support plate 204 to complete the connection. Finally, a steel reinforcement cage is placed between the inner formwork 3 and the outer formwork 101. By analogy, after the installation of multiple inner formworks 3 and steel reinforcement cages is completed, concrete is poured to complete the construction of the pipe gallery.

[0023] In a further embodiment, a plurality of second hydraulic cylinders 207 are provided between the support plate 204 and the cross bar 206; the second hydraulic cylinders 207 are existing hydraulic cylinders, externally connected to an existing hydraulic system, and controlled in an existing manner; a guide hole 209 is provided at the top of the support rod 203, and a plurality of guide rods 208 are provided at the bottom of the support plate 204. The guide rods 208 slide and extend into the interior of the guide hole 209 to guide the sliding of the support plate 204 through the guide rods 208 and the guide holes 209. Preferably, two second hydraulic cylinders 207 are provided at the top of the same cross bar 206.

[0024] After the construction of a section of the pipe gallery is completed, the first hydraulic cylinder 205 and the second hydraulic cylinder 207 are contracted to drive the inner formwork 3 and the support plate 204 to approach the inner formwork frame 2, and then the inner formwork frame 2 is pushed to move the inner formwork 3 and the inner formwork frame 2 out of the pipe gallery through the rollers 202, and then the construction of the next section of the pipe gallery is carried out. The operation is simple, the inner formwork is easy to move, the construction difficulty is reduced, and the construction efficiency is increased.

[0025] In the above operation, the top plate 4 can be directly left inside the pipe gallery. To increase stability, a steel reinforcement cage can be fixed on the top of the top plate 4 to facilitate increasing the overall strength of the pipe gallery; then a new top plate 4 is used during the subsequent construction process.

[0026] Further, a plurality of positioning holes 402 are provided at the top of the support plate 204; a plurality of positioning blocks 401 are provided at the bottom of the top plate 4, and the positioning blocks 401 are adapted to the positioning holes 402; the bottom surface area of the positioning blocks 401 is smaller than the top surface area, so as to avoid random displacement of the support plate 204 during the pouring process.

[0027] In a further embodiment, the inner formwork 3 is provided with a connecting mechanism 6, and the connecting mechanism 6 includes a number of connecting rods 601; one end of the connecting rod 601 abuts against the outer formwork 101, and the other end is provided with a limiting plate 602, and the limiting plate 602 fits against the inner formwork 3; a number of inserting holes 603 are provided inside the inner formwork 3, and an inserting rod 604 is provided on the side of the limiting plate 602 away from the inserting hole 603, and the inserting rod 604 is adapted to the inserting hole 603; a number of connecting grooves 605 are provided on the side surface of the connecting rod 601, and the connecting grooves 605 are connected to the steel bars of the steel reinforcement cage. The steel reinforcement cage is preferably a prefabricated steel reinforcement cage. During use, the steel reinforcement cage is connected through the connecting grooves 605 and the connecting rods 601, and then the inserting rods 604 connected to the corresponding connecting rods 601 are inserted into the inside of the inserting holes 603. Then, during the process of controlling the movement of the inner formwork 3, the steel reinforcement cage can be driven to move synchronously, and the distance between the inner formwork 3 and the outer formwork 101 can be controlled through the connecting rods 601.

[0028] In a further preferred solution, the inner formwork 3 is provided with a positioning mechanism 5, and the positioning mechanism 5 includes a number of fixing seats 501 fixedly connected to the inner formwork 3. Rotating blocks 502 are provided on the upper and lower sides of the fixing seat 501; a positioning plate 503 is provided on the side surface of the inner formwork 3, and the positioning plate 503 is fixedly connected to the rotating block 502; the rotating block 502 is fixedly connected with a rotating shaft 506, and the rotating shaft 506 is rotatably connected inside the fixing seat 501; a worm gear 507 is provided on the rotating shaft 506; the fixing seat 501 is provided with a motor 504. The motor 504 is an existing motor, which is controlled and connected in an existing manner, preferably a servo motor or a stepping motor. A worm 505 is provided on the output shaft of the motor 504, and the worm 505 meshes with the worm gear 507.

[0029] During use, start the motor 504 to drive the worm 505 to rotate, which can drive the worm gear 507 to rotate, thereby driving the rotating shaft 506 and the rotating block 502 to rotate, and finally driving the positioning plate 503. When connecting the middle inner formwork 3 in the combination of the inner formworks 3, the positioning plate 503 rotates to the inside of the inner formwork frame 2. At this time, the adjacent two inner formworks 3 can be normally connected. At the edges of the inner formworks 3 at both ends of the inner formwork 3 combination, rotate the positioning plate 503 to the position as shown in Figure 6 shown, and then concrete pouring can be carried out, which is convenient for the formation of the concrete pipe gallery.

[0030] In another embodiment, as shown in Figure 9 and 10 shown, the rotating block 502 is detachably connected to the positioning plate 503; the end of the positioning plate 503 is provided with an inserting block 508 and a positioning rod 509, and both the inserting block 508 and the positioning rod 509 extend into the inside of the rotating block 502; a connecting hole adapted to the positioning rod 509 is provided on the side surface of the rotating block 502, and a magnet 510 is provided inside the connecting hole; A fixed rod 511 is also provided. The fixed rod 511 is adapted to the connection hole, and the length of the fixed rod 511 is twice that of the connection hole.

[0031] The positioning rod 509 and the fixed rod 511 are made of a material that can be adsorbed by a magnet, such as iron. When the positioning plate 503 is not needed, the rotating block 502 is rotated to the position as shown in Figure 10 to facilitate the connection and fixation of the inner formwork 3. When the positioning plate 503 is needed, the fixed rod 511 is pulled out, and then the positioning rod 509 of the positioning plate 503 is inserted into the connection hole to complete the connection of the positioning plate 503. The operation is simple and convenient for use as needed.

[0032] Embodiment 2: An inner formwork construction method for open-cut in-situ construction of a pipe gallery includes the following steps: S1. Excavate the foundation pit according to the design route; S2. Set the outer formwork 101 in the foundation pit, and pour a concrete cushion layer at the bottom of the foundation pit to form the bottom slab 1; S3. Move the inner formwork 3 through the inner formwork frame 2; The movement of the inner formwork 3 includes the following steps: S31. Drive the inner formwork 3 away from the formed concrete pipe gallery by contracting the first hydraulic cylinder 205; S32. Push the inner formwork frame 2, and move it along the bottom slab 1 to the next construction position through the rollers 202 at the bottom of the inner formwork frame 2; S33. Place the steel reinforcement cage; S34. Drive the inner formwork 3 to the expected position by extending the first hydraulic cylinder 205.

[0033] S4. Place the steel reinforcement cage between the inner formwork 3 and the outer formwork 101, and pour concrete; S5. After the concrete solidifies, move the inner formwork 3 to the next construction position through the inner formwork frame 2; S6. Repeat S4 - S5 until the pipe gallery construction is completed.

[0034] During the above process, placing the steel reinforcement cage includes the following steps: S41. Place the steel reinforcement cage on the bottom slab 1; S42. Use the connecting rod 601 to connect the connecting rod 601 with the steel reinforcement cage, and make the insertion rod 604 at the end of the connecting rod 601 correspond to the insertion hole 603 inside the inner formwork 3 one by one; S43. Drive the inner formwork 3 by the inner formwork frame 2 to the side of the steel reinforcement cage to align the insertion rod 604 with the insertion hole 603; S44. Move the inner formwork frame 2 or the steel reinforcement cage to make the insertion rod 604 enter the insertion hole 603.

[0035] In the above - mentioned manner, the movement, assembly, disassembly of the inner template 3 are simpler and the operation is more convenient, so that the efficiency of overall pouring and utility tunnel construction is higher.

[0036] The above - mentioned embodiments are only the preferred technical solutions of the present invention and should not be regarded as limitations on the present invention. The protection scope of the present invention should be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, the equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. An in - formwork for open - cut in - situ construction of pipe galleries, comprising a bottom plate (1) and a number of outer formworks (101) arranged in a foundation pit. The outer formworks (101) are arranged on both sides of the bottom plate (1), and are characterized in that: An inner formwork frame (2) is provided on the top of the bottom plate (1). Inner formworks (3) are provided on both sides of the inner formwork frame (2), and a top plate (4) is provided on the top of the inner formworks (3); A steel reinforcement cage is arranged between the inner formwork (3) and the outer formwork (101).

2. The in-situ cast-in-place inner formwork for open-cut construction of pipe galleries according to claim 1, wherein: The inner formwork frame (2) includes a bottom frame (201). A number of rollers (202) are provided on the side of the bottom frame (201), and the rollers (202) are placed on the top of the bottom plate (1); A number of support rods (203) are provided on the top of the bottom frame (201), and cross bars (206) are arranged between adjacent support rods (203); A first hydraulic cylinder (205) is arranged between the support rod (203) and the inner formwork (3); A support plate (204) is provided on the top of the support rod (203), and the top plate (4) is located on the top of the support plate (204) and the inner formwork (3); The length of the top plate (4) is the same as that of the inner formwork (3). The side of the top plate (4) close to the outer formwork (101) is in the same plane as the surface of the inner formwork (101) close to the outer formwork (101).

3. The in - formwork for open - cut in - situ construction of pipe corridors according to claim 2, wherein: A number of second hydraulic cylinders (207) are arranged between the support plate (204) and the cross bar (206); A guide hole (209) is provided on the top of the support rod (203), and a number of guide rods (208) are provided on the bottom of the support plate (204). The guide rods (208) slide and extend into the interior of the guide hole (209); Two second hydraulic cylinders (207) are arranged on the top of the same cross bar (206).

4. A formwork for in-situ cast-in-place construction of an open-cut utility tunnel according to any one of claims 2 to 3, characterized in that: A number of positioning holes (402) are provided on the top of the support plate (204); A number of positioning blocks (401) are provided on the bottom of the top plate (4), and the positioning blocks (401) are adapted to the positioning holes (402); The bottom surface area of the positioning block (401) is smaller than the top surface area.

5. The in - formwork for the open - cut in - situ construction of a pipe gallery according to claim 1, wherein: The inner formwork (3) is provided with a positioning mechanism (5). The positioning mechanism (5) includes a number of fixed seats (501) fixedly connected to the inner formwork (3). Rotating blocks (502) are provided on the upper and lower sides of the fixed seats (501); A positioning plate (503) is provided on the side of the inner formwork (3), and the positioning plate (503) is fixedly connected to the rotating block (502); The rotating block (502) is fixedly connected with a rotating shaft (506), and the rotating shaft (506) is rotatably connected to the inside of the fixed seat (501); A worm gear (507) is provided on the rotating shaft (506); The fixed seat (501) is provided with a motor (504). A worm (505) is provided on the output shaft of the motor (504), and the worm (505) meshes with the worm gear (507).

6. The in - formwork for open - cut in - situ construction of pipe corridors according to claim 5, wherein: The rotating block (502) is detachably connected to the positioning plate (503); The end of the positioning plate (503) is provided with a plug - in block (508) and a positioning rod (509), and both the plug - in block (508) and the positioning rod (509) extend into the interior of the rotating block (502); A connection hole adapted to the positioning rod (509) is provided on the side of the rotating block (502), and a magnet (510) is provided inside the connection hole; There is also a fixed rod (511), which is adapted to the connection hole, and the length of the fixed rod (511) is twice that of the connection hole.

7. The in - formwork for the cut - and - cover in - situ construction of the pipe gallery according to claim 1, wherein: The inner template (3) is provided with a connection mechanism (6), and the connection mechanism (6) includes a plurality of connecting rods (601); One end of the connecting rod (601) abuts against the outer template (101), and the other end is provided with a limiting plate (602), and the limiting plate (602) fits against the inner template (3); A plurality of insertion holes (603) are provided inside the inner template (3), and an insertion rod (604) is provided on the side of the limiting plate (602) away from the insertion hole (603), and the insertion rod (604) is adapted to the insertion hole (603); A plurality of connection grooves (605) are provided on the side surface of the connecting rod (601), and the connection grooves (605) are connected to the steel bars of the steel reinforcement cage.

8. A construction method for the internal formwork of the open-cut cast-in-place construction of the pipe gallery described in any one of claims 1-7, characterized in that: It includes the following steps: S1. Excavate the foundation pit openly according to the designed route; S2. Set the outer template (101) in the foundation pit, and pour a concrete cushion layer at the bottom of the foundation pit to form the bottom plate (1); S3. Move the inner template (3) through the inner formwork support (2); S4. Place the steel reinforcement cage between the inner template (3) and the outer template (101), and pour concrete; S5. The concrete solidifies, and the inner template (3) is moved to the next construction position through the inner formwork support (2); S6. Repeat S4 - S5 until the construction of the pipe gallery is completed.

9. The construction method of the internal formwork for the open-cut in-situ construction of the pipe gallery according to claim 8, characterized in that: In S3, moving the inner template (3) includes the following steps: S31. Drive the inner template (3) away from the formed concrete pipe gallery by retracting the first hydraulic cylinder (205); S32. Push the inner formwork support (2), and move it to the next construction position along the bottom plate (1) through the rollers (202) at the bottom of the inner formwork support (2); S33. Place the steel reinforcement cage; S34. Drive the inner template (3) to the expected position by extending the first hydraulic cylinder (205).

10. The construction method of the inner formwork for the open-cut in-situ construction of the pipe gallery according to claim 8, characterized in that: The steel reinforcement cage is a prefabricated steel reinforcement cage, and the sizes of the steel reinforcement cages are the same; In S4, placing the steel reinforcement cage includes the following steps: S41. Place the steel reinforcement cage on the bottom plate (1); S42. Use the connecting rod (601) to connect the connecting rod (601) with the steel reinforcement cage, and make the insertion rods (604) at the ends of the connecting rods (601) correspond to the positions of the insertion holes (603) inside the inner template (3) one by one; S43. The inner formwork support (2) drives the inner template (3) to move to the side of the steel reinforcement cage so that the insertion rods (604) are aligned with the insertion holes (603); S44. Move the inner formwork support (2) or the steel reinforcement cage so that the insertion rods (604) enter the insertion holes (603).

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