A formwork system and formwork construction method for building construction

Abstract

This application discloses a formwork system and formwork construction method for building construction, which includes an inner wall formwork, an outer wall formwork, and connecting components. The connecting components include a bolt assembly provided in the inner wall formwork and a threaded sleeve assembly provided in the outer wall formwork. The bolt assembly includes a bolt body and a detachable cylinder detachably connected to the tail of the bolt body. A columnar groove is formed on the outer circumference of the detachable cylinder. A spring is fixed on the bottom wall of the columnar groove. A sliding block is fixed on the spring and slidably connected to the columnar groove. A through hole is formed on the inner wall of the inner wall formwork for the bolt assembly to pass through. An annular groove is formed on the inner wall of the through hole. The top of the sliding block can be embedded in the annular groove under the action of the spring. A through hole is formed on the outer wall formwork for the threaded sleeve assembly to pass through. The threaded sleeve assembly includes a connecting sleeve and a detachable block threadedly connected to the head of the connecting sleeve. The bolt body is threadedly connected to the connecting sleeve and abuts against the detachable block.

Description

Technical Field

[0001] This invention relates to the field of formwork structures for building construction, and in particular to a formwork system and formwork construction method for building construction. Background Technology

[0002] In the field of building construction, formwork is a temporary support structure that shapes concrete structures and components according to specified positions and geometric dimensions, maintains their correct position, and bears the self-weight of the formwork and external loads acting on it. The purpose of formwork engineering construction is to ensure the quality and safety of concrete works, accelerate the construction progress, and reduce project costs.

[0003] When pouring concrete for building walls, it is necessary to set up inner wall formwork, outer wall formwork, and connecting components to connect the two. After the inner wall formwork and outer wall formwork are supported, the inner wall formwork and outer wall formwork are connected by the connecting components, and then concrete is poured into the cavity between the inner wall formwork and outer wall formwork.

[0004] However, after the current building walls are poured and the concrete has completely solidified, it is necessary to cut off the parts of several connecting components that protrude from the opposite sides of the inner and outer wall formwork before removing the inner and outer wall formwork. The whole process is time-consuming, wasteful of materials, and inefficient, and there is considerable room for improvement.

[0005] Based on this, this application provides a formwork system and formwork construction method for building construction that can quickly dismantle connecting components, internal wall formwork and external wall formwork, and some components can be reused. Summary of the Invention

[0006] In order to enable the rapid removal of connecting components, internal wall formwork, and external wall formwork, and to allow some components to be reused, this application provides a formwork system and formwork construction method for building construction.

[0007] This application provides a formwork system and formwork construction method for building construction, which adopts the following technical solution:

[0008] A formwork system for building construction includes an inner wall formwork, an outer wall formwork, and connecting components for connecting the inner wall formwork and the outer wall formwork. The connecting components include a bolt assembly on the inner wall formwork and a threaded sleeve assembly on the outer wall formwork. The bolt assembly includes a bolt body and a detachable cylinder detachably connected to the tail of the bolt body. A columnar groove is formed on the outer circumference of the detachable cylinder. A spring is fixed to the bottom wall of the columnar groove, and a sliding block is fixed to the spring and slidably connected to the columnar groove. A through hole is formed on the inner wall formwork for the bolt assembly to pass through. The inner wall of the through hole... The upper part has an annular groove, and the top of the sliding block can be embedded in the annular groove under the action of a spring. The outer wall template has a through hole for the threaded sleeve assembly to pass through. The threaded sleeve assembly includes a connecting sleeve and a detachable block threaded to the head of the connecting sleeve. The detachable block passes through the through hole. The bolt body is threaded to the connecting sleeve. The detachable cylinder abuts against the detachable block. The edge of the sliding block facing the outer wall template has a beveled surface. The difference between the upper and lower edges of the beveled surface along the radial direction of the detachable cylinder is the same as the extendable length of the sliding block along the radial direction of the detachable cylinder.

[0009] By adopting the above technical solution, after the wall is poured, the bolt assembly is first rotated to move the bolt body away from the detachable block until the sliding block moves to the position of the annular groove. One end of the sliding block is embedded in the annular groove under the action of the spring, while the other end of the sliding block is still located in the columnar groove, restricting the further movement of the bolt assembly. The bolt body is then pulled to separate it from the detachable cylinder. The detachable block is rotated outward to unscrew it and detach it from the connection between the connecting sleeve and the outer wall formwork. After the detachable block is removed, the cavity of the connecting sleeve is exposed and filled with cement concrete with low fluidity. After the cement concrete in the connecting sleeve solidifies, the inner wall formwork and the outer wall formwork are pulled to both sides, thereby removing the detachable cylinder on the inner wall formwork and realizing the dismantling of the formwork system. The cement concrete in the connecting sleeve and its inner cavity is left in the wall to further reinforce it. The remaining components can be reused in the next building wall construction. Based on the above construction procedures, the rapid dismantling and reuse of connecting components, inner wall formwork, and outer wall formwork are achieved, saving resources and improving efficiency.

[0010] Preferably, when the end of the sliding block away from the spring is embedded in the annular groove, the tail end face of the detachable cylinder is flush with the side wall of the inner wall template facing the outer wall template.

[0011] By adopting the above technical solution, after the detachable column is removed along with the inner wall formwork, the cement concrete surface in the connecting sleeve is flush with the wall surface, ensuring flatness and aesthetics.

[0012] Preferably, the end face of the connecting sleeve near the detachable block is flush with the side wall of the outer wall template facing the inner wall template.

[0013] By adopting the above technical solution, after the external wall formwork is removed, the cement concrete surface in the connecting sleeve is flush with the wall surface, ensuring flatness and aesthetics.

[0014] Preferably, the outer side of the detachable block is also provided with a detachable cover plate. The detachable cover plate and the detachable block are engaged by a triangular limiting block and a triangular limiting groove. A semi-annular groove is opened on the side wall of the outer wall template away from the inner wall template. An extension plate extends from the detachable cover plate. The extension plate is embedded in the semi-annular groove. Rubber pads are provided on both the outer and inner circumferential surfaces of the extension plate.

[0015] By adopting the above technical solution, the cooperation between the extension plate and the semi-annular groove restricts the rotation of the detachable cover plate. Furthermore, the cooperation between the triangular limiting block and the triangular limiting groove restricts the relative rotation between the detachable cover plate and the detachable block, thereby restricting the relative rotation between the detachable block and the external wall formwork.

[0016] Preferably, the detachable block includes a first columnar block, a second columnar block, and a third columnar block. The first columnar block is threadedly connected to a connecting sleeve, the second columnar block is inserted into a through hole, and the third columnar block abuts against the side wall of the outer wall template away from the inner wall template.

[0017] By adopting the above technical solution, the first columnar block and the second columnar block are detachably connected, so that after the cement concrete is filled, the first columnar block can be removed, and the second and third columnar blocks can be used to seal the connection sleeve port.

[0018] Preferably, the first columnar block and the second columnar block are locked together by a first slot and a first locking block.

[0019] By adopting the above technical solution, the connection between the first columnar block and the second columnar block was achieved.

[0020] Preferably, the detachable cylinder has a spherical locking hole on the side facing the bolt body, and the bolt body has an integrally formed spherical locking block adapted to the spherical locking hole at its tail, and the spherical locking block is locked in the spherical locking hole.

[0021] By adopting the above technical solution, a detachable connection between the detachable cylinder and the bolt body is achieved.

[0022] Preferably, a plurality of limiting protrusions are integrally formed on the tail plane of the bolt body, and a limiting groove is formed on the surface of the detachable cylinder facing the bolt body, and the limiting protrusions are engaged in the limiting groove.

[0023] By adopting the above technical solution, the relative rotation between the bolt body and the detachable cylinder is restricted.

[0024] Preferably, the connecting sleeve is provided with a sealing ring at its tail end, and when the connecting member connects the inner wall template and the outer wall template, the sealing ring abuts against the side wall of the inner wall template facing the outer wall template.

[0025] By adopting the above technical solution, the sealing performance of the connection between the connecting sleeve and the inner wall formwork is improved.

[0026] A formwork construction method for a formwork system used in building construction includes the following steps:

[0027] S1. After the inner wall formwork and outer wall formwork are supported, first insert the bolt assembly from one side of the inner wall formwork between the inner wall formwork and the outer wall formwork until the head of the bolt body abuts against the outer wall of the inner wall formwork. Then screw in the threaded sleeve assembly so that the connecting sleeve is threadedly connected to the outside of the bolt body. When the connecting sleeve abuts against the protruding sliding block, due to the setting of the beveled surface, the sliding block is embedded in the columnar groove under the action of the connecting sleeve. Continue to screw in the connecting sleeve until the tail of the connecting sleeve abuts against the inner wall formwork. The end face of the detachable cylinder away from the bolt body abuts against the detachable block.

[0028] S2. Complete the wall pouring;

[0029] S3. First, rotate the bolt assembly to move the bolt body away from the detachable block until the sliding block moves to the position of the annular groove. One end of the sliding block is embedded in the annular groove under the action of the spring, while the other end of the sliding block is still located in the cylindrical groove, restricting the continued movement of the bolt assembly. Continue to pull the bolt body to disengage the spherical locking block from the spherical locking hole, thereby separating the bolt body from the detachable cylinder.

[0030] S4. Rotate the detachable block outward to unscrew it and detach it from the connection between the connecting sleeve and the external wall formwork;

[0031] S5. Disconnect the connection between the first columnar block and the second columnar block;

[0032] S6. After the detachable block is disassembled, the cavity of the connecting sleeve is exposed and filled with cement concrete with low fluidity.

[0033] S7. After the cement concrete filling is completed, the detachable block that has been removed from the first column block is snapped onto the outer wall formwork to temporarily seal the opening end of the connecting sleeve.

[0034] S8. After the cement concrete in the connecting sleeve has solidified, pull the inner wall formwork and the outer wall formwork to both sides respectively, thereby removing the detachable column on the inner wall formwork, realizing the dismantling of the formwork system, and leaving the cement concrete in the connecting sleeve and its inner cavity in the wall. Attached Figure Description

[0035] Figure 1 It is a schematic diagram showing the overall structure of the interior wall formwork, exterior wall formwork, and connecting components.

[0036] Figure 2 It is a cross-sectional schematic diagram showing the structure of the connecting components.

[0037] Figure 3 yes Figure 2 A magnified view of part A in the diagram.

[0038] Figure 4 It is a cross-sectional schematic diagram showing the detachable cylinder located at the inner wall formwork.

[0039] Figure 5 This is a schematic diagram showing the structure of the bolt assembly.

[0040] Figure 6 This is a schematic diagram showing the structure of the removable blocks and the removable cover plate.

[0041] Figure 7 This is a schematic diagram showing the structure of the threaded sleeve assembly.

[0042] Explanation of reference numerals in the attached figures:

[0043] 1. Interior wall formwork; 11. Circular groove; 2. Exterior wall formwork; 21. Semi-circular groove; 3. Connecting component; 4. Bolt assembly; 41. Bolt body; 411. Spherical locking block; 412. Limiting protrusion; 42. Detachable cylinder; 421. Spherical locking hole; 422. Limiting groove; 423. Columnar groove; 424. Spring; 425. Sliding block; 426. Beveled surface; 5. Screw sleeve assembly; 51. Connecting sleeve; 52. Detachable block; 521. First columnar block; 522. Second columnar block; 523. Third columnar block; 524. First locking groove; 525. First locking block; 526. Triangular limiting block; 53. Detachable cover plate; 531. Extension plate; 532. Triangular limiting groove. Detailed Implementation

[0044] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0045] This application discloses a formwork system and formwork construction method for building construction.

[0046] Reference Figures 1 to 7A formwork system for building construction includes an inner wall formwork 1, an outer wall formwork 2, and a connecting member 3 for connecting the inner wall formwork 1 and the outer wall formwork 2. The inner wall formwork 1 and the outer wall formwork 2 are arranged parallel to each other. Both the inner wall formwork 1 and the outer wall formwork 2 are composed of multiple formwork units connected to each other. The connection methods can be pin connections, insertion joints, adhesive joints, etc., which are all existing technical means well known to those skilled in the art and will not be described in detail here.

[0047] The connecting component 3 includes a bolt assembly 4 installed on the inner wall formwork 1 and a threaded sleeve assembly 5 installed on the outer wall formwork 2.

[0048] The bolt assembly 4 includes a bolt body 41 and a detachable cylinder 42 located at the tail of the bolt body 41. Specifically, the detachable cylinder 42 is connected to the bolt body 41 by a snap-fit ​​connection. The diameter of the detachable cylinder 42 is the same as the diameter of the shank of the bolt body 41. A through hole is provided on the inner wall template 1 for the bolt body 41 to pass through. The bolt body 41 passes through the through hole, and the head of the bolt body 41 abuts against the side wall of the inner wall template 1 away from the outer wall template 2.

[0049] The detachable cylinder 42 has a spherical locking hole 421 on the side facing the bolt body 41. The bolt body 41 has an integrally formed spherical locking block 411 that is adapted to the spherical locking hole 421. The spherical locking block 411 is locked in the spherical locking hole 421, and the center of the spherical locking block 411 is located in the spherical locking hole 421.

[0050] Multiple limiting protrusions 412 are integrally formed on the tail plane of the bolt body 41, with two limiting protrusions 412 evenly spaced around the axis of the bolt body 41. The surface of the detachable cylinder 42 facing the bolt body 41 has limiting grooves 422 that correspond one-to-one with the limiting protrusions 412. The limiting protrusions 412 are engaged in the limiting grooves 422 to restrict the relative rotation between the bolt body 41 and the detachable cylinder 42.

[0051] A cylindrical groove 423 is formed on the outer circumferential surface of the detachable cylinder 42, and two cylindrical grooves 423 are evenly distributed around the circumference of the detachable cylinder 42. A spring 424 is fixed on the bottom wall of the cylindrical groove 423. The spring 424 is arranged radially along the detachable cylinder 42. A sliding block 425 is fixed to the end of the spring 424 away from the bottom wall of the cylindrical groove 423. The outer wall of the sliding block 425 contacts the inner wall of the cylindrical groove 423, and the sliding block 425 is slidably connected in the cylindrical groove 423.

[0052] The threaded sleeve assembly 5 includes a connecting sleeve 51, a detachable block 52 threaded to the head of the connecting sleeve 51, and a detachable cover plate 53 located outside the detachable block 52. The detachable cover plate 53 is also clamped to the external wall template 2.

[0053] The exterior wall template 2 has through holes for the threaded sleeve assembly 5 to pass through, and the threaded sleeve assembly 5 is inserted into the through holes.

[0054] A sealing ring is fixed at the tail of the connecting sleeve 51. The threaded sleeve assembly 5 passes through the outer wall template 2 away from the inner wall template 1 and is inserted between the two. When the connecting member 3 is in the state of connecting the inner wall template 1 and the outer wall template 2, the bolt body 41 is threaded into the connecting sleeve 51. The sealing ring at the tail of the connecting sleeve 51 abuts against the side wall of the inner wall template 1 facing the outer wall template 2. The end face of the connecting sleeve 51 near the detachable block 52 is flush with the side wall of the outer wall template 2 facing the inner wall template 1. The sealing ring is not shown in the attached drawing.

[0055] The detachable block 52 has a circular cross-section and includes a first columnar block 521 for threaded connection with the connecting sleeve 51, a second columnar block 522 passing through a through hole in the outer wall template 2, and a third columnar block 523 abutting against the side wall of the outer wall template 2 away from the inner wall template 1. The outer peripheral wall of the second columnar block 522 contacts the inner wall of the through hole in the outer wall template 2. The first columnar block 521 and the second columnar block 522 are locked together by a first slot 524 and a first locking block 525 to facilitate the assembly and disassembly of the first columnar block 521 and the second columnar block 522. The second columnar block 522 and the third columnar block 523 are integrally formed. The outer diameter of the connecting sleeve 51 is equal to the outer diameter of the second columnar block 522.

[0056] A detachable cover plate 53 is installed on the outside of the third columnar block 523. A semi-annular groove 21 is provided on the side wall of the outer wall template 2 away from the inner wall template 1. An extension plate 531 is provided on the detachable cover plate 53 for fitting the semi-annular groove 21. The extension plate 531 is semi-annular and is embedded in the semi-annular groove 21.

[0057] Rubber pads are provided on both the outer and inner circumferential surfaces of the extension plate 531, so that the extension plate 531 is not easy to fall off after being embedded in the semi-annular groove 21. The rubber pads are not shown in the attached drawings.

[0058] An annular groove 11 is provided on the inner wall of the through hole of the inner wall template 1. The cross-sectional shape of the annular groove 11 is adapted to the cross-sectional shape of the portion of the sliding block 425 that extends out of the columnar groove 423. The end of the sliding block 425 away from the spring 424 extends out of the columnar groove 423 and is embedded in the annular groove 11 under the action of the spring 424, while the end of the sliding block 425 near the spring 424 remains in the columnar groove 423, restricting the continued movement of the bolt assembly 4. Since the detachable cylinder 42 also rotates with the bolt body 41 when the bolt body 41 rotates, the circumferential position of the sliding block 425 is uncertain. The annular groove 11 ensures that the sliding block 425 can be embedded in it at any circumferential position, thereby limiting the bolt assembly 4.

[0059] The sliding block 425 has a beveled surface 426 at one end of the outer wall template 2. The difference between the upper and lower edges of the beveled surface 426 along the radial direction of the detachable cylinder 42 is the same as the extendable length of the sliding block 425 along the radial direction of the detachable cylinder 42.

[0060] To facilitate the removal of components, all components in contact with concrete are coated with a waterproof layer to prevent adhesion between the components and the cement concrete. Specifically, the waterproof layer is applied to the following locations: the two adjacent side walls of the inner wall formwork 1 and the outer wall formwork 2; the end face of the tail of the detachable column 42; the end face of the first columnar block 521 facing away from the second columnar block 522; and the outer wall and tail end face of the extension pipe.

[0061] A formwork construction method for a formwork system used in building construction includes the following steps:

[0062] S1. Connect the inner wall formwork 1 and the outer wall formwork 2:

[0063] After the inner wall formwork 1 and outer wall formwork 2 are supported, the bolt assembly 4 is first inserted from one side of the inner wall formwork 1 between the inner wall formwork 1 and the outer wall formwork 2, until the head of the bolt body 41 abuts against the outer wall of the inner wall formwork 1. Then, the threaded sleeve assembly 5 is screwed in, so that the connecting sleeve 51 is threadedly connected to the outside of the bolt body 41. When the connecting sleeve 51 abuts against the protruding sliding block 425, due to the setting of the beveled surface 426, the sliding block 425 is embedded in the column under the action of the connecting sleeve 51. In the groove 423, the connecting sleeve 51 continues to be screwed in until the sealing ring on the connecting sleeve 51 abuts against the side wall of the inner wall template 1 facing the outer wall template 2. Then, the detachable cover plate 53 is placed on the detachable block 52, so that the triangular limiting block 526 is embedded in the triangular limiting groove 532 and the extension plate 531 is embedded in the semi-annular groove 21. The end face of the detachable cylinder 42 away from the bolt body 41 abuts against the detachable block 52, thereby realizing the connection between the outer wall template 2 and the inner wall template 1.

[0064] S2. Casting the wall:

[0065] Concrete is poured into the cavity between the inner wall formwork 1 and the outer wall formwork 2. After the concrete has set, the building wall is completed.

[0066] S3, Remove bolt assembly 4:

[0067] First, rotate the bolt assembly 4 to move the bolt body 41 away from the detachable block 52 until the sliding block 425 moves to the position of the annular groove 11. One end of the sliding block 425 is embedded in the annular groove 11 under the action of the spring 424, while the other end of the sliding block 425 is still located in the columnar groove 423, restricting the continued movement of the bolt assembly 4. At this time, the tail end face of the detachable cylinder 42 is flush with the side wall of the inner wall template 1 facing the outer wall template 2. Continue to pull the bolt body 41 to disengage the spherical locking block 411 from the spherical locking hole 421 and the limiting protrusion 412 from the limiting groove 422, thereby realizing the separation of the bolt body 41 from the detachable cylinder 42.

[0068] S4. Remove the removable cover plate 53 and removable block 52 from the threaded sleeve assembly 5:

[0069] Pull the removable cover plate 53 to the side facing away from the inner wall template 1 to remove the removable cover plate 53 and release the restriction of the removable cover plate 53 on the removable block 52. After the removable cover plate 53 is removed, rotate the removable block 52 outward to unscrew it and detach it from the connection between the connecting sleeve 51 and the outer wall template 2.

[0070] S5. Remove the first columnar block 521:

[0071] After the detachable block 52 is removed, the connection between the first columnar block 521 and the second columnar block 522 is disconnected.

[0072] S6. Filling with cement concrete:

[0073] After the detachable cover plate 53 and the detachable block 52 are removed, the cavity of the connecting sleeve 51 is exposed. Cement concrete with low fluidity is selected for filling, so that it is not easy to flow out after filling the cavity of the connecting sleeve 51.

[0074] S7. Seal the open end of the connecting sleeve 51:

[0075] After the cement concrete filling is completed, the detachable block 52, which has already removed the first column block 521, is attached to the outer wall formwork 2. Then, the detachable cover is placed on the outside of the detachable block 52 and connected to the outer wall formwork 2 to temporarily seal the opening end of the connecting sleeve 51.

[0076] S8. Remove the inner wall formwork 1 and the outer wall formwork 2:

[0077] After the cement concrete in the connecting sleeve 51 has solidified, the inner wall formwork 1 and the outer wall formwork 2 are pulled to both sides, thereby removing the detachable column 42 on the inner wall formwork 1 and the detachable block 52 and detachable cover plate 53 on the outer wall formwork 2, thus dismantling the formwork system. The cement concrete in the connecting sleeve 51 and its inner cavity remains in the wall, which plays a role in further reinforcement. The remaining components can be reused in the construction of the next building wall, saving resources.

[0078] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A formwork system for building construction, comprising an inner wall formwork (1), an outer wall formwork (2), and a connecting member (3) for connecting the inner wall formwork (1) and the outer wall formwork (2), characterized in that: The connecting component (3) includes a bolt assembly (4) provided on the inner wall template (1) and a threaded sleeve assembly (5) provided on the outer wall template (2). The bolt assembly (4) includes a bolt body (41) and a detachable cylinder (42) detachably connected to the tail of the bolt body (41). A columnar groove (423) is provided on the outer circumferential surface of the detachable cylinder (42). A spring (424) is fixed on the bottom wall of the columnar groove (423). A sliding block (425) is fixed on the spring (424) and slidably connected to the columnar groove (423). A through hole is provided on the inner wall template (1) for the bolt assembly (4) to pass through. An annular groove (11) is provided on the inner wall of the through hole. The top of the sliding block (425) can be connected to the spring (424). 4) is embedded in the annular groove (11) under the action of the outer wall template (2). A through hole is provided on the outer wall template (2) for the threaded sleeve assembly (5) to pass through. The threaded sleeve assembly (5) includes a connecting sleeve (51) and a detachable block (52) threaded to the head of the connecting sleeve (51). The detachable block (52) is inserted in the through hole. The bolt body (41) is threaded to the connecting sleeve (51). The detachable cylinder (42) abuts against the detachable block (52). The sliding block (425) has a beveled surface (426) at one end edge facing the outer wall template (2). The difference between the upper and lower edges of the beveled surface (426) along the radial direction of the detachable cylinder (42) is the same as the extendable length of the sliding block (425) along the radial direction of the detachable cylinder (42).

2. The formwork system for building construction according to claim 1, characterized in that: When the sliding block (425) is embedded in the annular groove (11) at one end away from the spring (424), the tail end face of the detachable cylinder (42) is flush with the side wall of the inner wall template (1) facing the outer wall template (2).

3. A formwork system for building construction according to claim 2, characterized in that: The end face of the connecting sleeve (51) near the detachable block (52) is flush with the side wall of the outer wall template (2) facing the inner wall template (1).

4. A formwork system for building construction according to claim 3, characterized in that: The detachable block (52) is also provided with a detachable cover plate (53) on its outer side. The detachable cover plate (53) and the detachable block (52) are connected by a triangular limiting block (526) and a triangular limiting groove (532). The outer wall template (2) is provided with a semi-annular groove (21) on its side wall away from the inner wall template (1). An extension plate (531) extends from the detachable cover plate (53). The extension plate (531) is embedded in the semi-annular groove (21). Rubber pads are provided on both the outer and inner circumferential surfaces of the extension plate (531).

5. A formwork system for building construction according to claim 4, characterized in that: The detachable block (52) includes a first columnar block (521), a second columnar block (522), and a third columnar block (523). The first columnar block (521) is threadedly connected to the connecting sleeve (51), the second columnar block (522) is inserted into the through hole, and the third columnar block (523) abuts against the side wall of the outer wall template (2) away from the inner wall template (1).

6. A formwork system for building construction according to claim 5, characterized in that: The first columnar block (521) and the second columnar block (522) are locked together by the cooperation of the first slot (524) and the first locking block (525).

7. A formwork system for building construction according to claim 6, characterized in that: The detachable cylinder (42) has a spherical locking hole (421) on the side facing the bolt body (41). The bolt body (41) has an integrally formed spherical locking block (411) that is adapted to the spherical locking hole (421). The spherical locking block (411) is locked in the spherical locking hole (421).

8. A formwork system for building construction according to claim 7, characterized in that: The bolt body (41) has multiple limiting protrusions (412) integrally formed on the tail plane. The detachable cylinder (42) has a limiting groove (422) on the surface facing the bolt body (41). The limiting protrusions (412) are engaged in the limiting groove (422).

9. A formwork system for building construction according to claim 1, characterized in that: The connecting sleeve (51) is provided with a sealing ring at its tail end. When the connecting member (3) connects the inner wall template (1) and the outer wall template (2), the sealing ring abuts against the side wall of the inner wall template (1) facing the outer wall template (2).

10. A formwork construction method based on the formwork system for building construction according to any one of claims 5-8, characterized in that: Includes the following steps: S1. After the inner wall template (1) and outer wall template (2) are supported, the bolt assembly (4) is first inserted from one side of the inner wall template (1) between the inner wall template (1) and the outer wall template (2) until the head of the bolt body (41) abuts against the outer wall of the inner wall template (1). Then the threaded sleeve assembly (5) is screwed in so that the connecting sleeve (51) is threadedly connected to the outside of the bolt body (41). When the connecting sleeve (51) abuts against the extended sliding block (425), due to the setting of the beveled surface (426), the sliding block (425) is embedded in the column groove (423) under the action of the connecting sleeve (51). The connecting sleeve (51) continues to be screwed in until the tail of the connecting sleeve (51) abuts against the inner wall template (1). The end face of the detachable cylinder (42) away from the bolt body (41) abuts against the detachable block (52). S2. Complete the wall pouring; S3. First, rotate the bolt assembly (4) to move the bolt body (41) away from the detachable block (52) until the sliding block (425) moves to the position of the annular groove (11). One end of the sliding block (425) is embedded in the annular groove (11) under the action of the spring (424), while the other end of the sliding block (425) is still located in the cylindrical groove (423), restricting the continued movement of the bolt assembly (4). Continue to pull the bolt body (41) to separate it from the detachable cylinder (42). S4. Rotate the detachable block (52) outward to unscrew the detachable block (52) and disconnect it from the connection between the connecting sleeve (51) and the external wall template (2); S5. Disconnect the connection between the first columnar block (521) and the second columnar block (522); S6. After the detachable block (52) is disassembled, the cavity of the connecting sleeve (51) is exposed and filled with cement concrete with low fluidity. S7. After the cement concrete filling is completed, the detachable block (52) of the first column block (521) that has been removed is fastened to the outer wall formwork (2) to temporarily seal the opening end of the connecting sleeve (51). S8. After the cement concrete in the connecting sleeve (51) has solidified, pull the inner wall formwork (1) and the outer wall formwork (2) to both sides respectively, thereby removing the detachable column (42) on the inner wall formwork (1) to dismantle the formwork system. The cement concrete in the connecting sleeve (51) and its inner cavity remains in the wall.

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