A formwork for pouring the edge of a middle plate in a shield tunnel

Abstract

The present application relates to a kind of for pouring shield tunnel inside board edge width frame, first horizontal support lead screw group horizontal placement, the telescopic length of first horizontal support lead screw is adjusted by rotating handle on each first horizontal support lead screw;The timber group is placed on the upper portion of first horizontal support lead screw group, and the longitudinal axis of each timber is perpendicular to the axial direction of first horizontal support lead screw group;Second horizontal support lead screw group passes through the groove on each timber, and the telescopic length of second horizontal support lead screw is adjusted by rotating handle on each second horizontal support lead screw;One end of second horizontal support lead screw group is abutted on the vertical face of L-shaped steel formwork;The horizontal plane of L-shaped steel formwork is placed on the upper portion of timber group, and end head wood formwork is embedded between segment and L-shaped steel formwork.The present application can solve the problem that the construction cycle of truss support system in narrow and irregular space outside the side wall of round tunnel is long.

Description

A formwork for casting the inner middle slab edge of a shield tunnel. Technical Field

[0001] This invention relates to a construction formwork for the internal structure of tunnel engineering, and more particularly to a formwork for casting the edge of the middle slab inside a shield tunnel. Background Technology

[0002] With the continuous development of tunnel construction technology, the diameter of newly built tunnel sections is increasing, leading to the emergence of more and more ultra-large diameter "single-tube double-layer" shield tunnels. A "single-tube double-layer" shield tunnel refers to a tunnel section with an added middle slab, allowing for two-way traffic between the upper and lower layers. When constructing the middle slab inside a small-diameter shield tunnel, a telescopic mobile formwork trolley can be used for integrated casting. For example, Chinese patent application number 200820157167.9, "Trolley for Construction of Double-Layer Road Surface Structure in Tunnel," discloses a mobile formwork trolley with a telescopic crossbeam, which can be used to erect the bottom formwork for the upper road anti-scour sidewall and the outer cantilever slab. However, this formwork trolley is only suitable for small-diameter shield tunnels that do not include the lower sidewall structure, and not for the bottom formwork erection of the inner middle slab edge of ultra-large diameter shield tunnels that are affected by the lower sidewall reinforcement. When constructing the inner slab of an ultra-large diameter shield tunnel, the lower sidewalls of the slab are often used as the boundary. For the slab within the sidewalls, a formwork trolley can be used for integral casting. For example, Chinese patent application number 201910468871.9, "Formwork Trolley for Casting the Inner Slab of a Shield Tunnel and its Construction Method," discloses a formwork trolley for casting the slab that can move within curved tunnels. For the slab edges outside the sidewalls, there is currently no specifically designed formwork system. Existing technology mainly uses a general-purpose truss support system for erecting the bottom formwork of the slab edges. When using a general-purpose truss support system for formwork erection, the truss structure must be assembled and disassembled section by section, which is cumbersome, complex, and inefficient. Chinese patent application number 202120292785.X, entitled "A Simple Mobile Formwork Support," discloses a mobile formwork support including a support lifting device, a moving device, and a full-span disc-locked bracket. This overcomes the shortcomings of traditional full-span brackets, which involve repeated disassembly and assembly, resulting in a long construction cycle. However, this formwork support is only suitable for relatively regular rectangular sections in open-cut tunnels, and not for narrow, irregular spaces outside the side walls of circular tunnels. Therefore, achieving rapid disassembly and assembly of the formwork for the inner slab side panels of ultra-large diameter shield tunnels is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a formwork for casting the inner slab edge panels of a shield tunnel, thereby solving the problem of long construction cycles due to repeated disassembly and assembly of truss support systems in the narrow and irregular spaces outside the inner sidewalls of circular tunnels. Furthermore, the formwork structure for casting the inner slab edge panels of a shield tunnel in this invention is simple, easy to manufacture, and has straightforward disassembly and assembly steps, effectively improving the efficiency of the casting construction of the internal structure of tunnel engineering.

[0004] The objective of this invention can be achieved through the following technical solutions:

[0005] A formwork for casting the inner slab edge of a shield tunnel includes a first horizontal support screw assembly, a second horizontal support screw assembly, a timber assembly, an L-shaped steel template, and end timber templates. The first horizontal support screw assembly is placed horizontally, and its extension length is adjusted by rotating the handle on each first horizontal support screw. The timber assembly is placed on top of the first horizontal support screw assembly, with the longitudinal axis of each timber perpendicular to the axis of the first horizontal support screw assembly. The second horizontal support screw assembly passes through grooves on each timber, and its extension length is adjusted by rotating the handle on each second horizontal support screw. One end of the second horizontal support screw assembly abuts against the vertical surface of the L-shaped steel template. The horizontal surface of the L-shaped steel template is placed on top of the timber assembly, and the end timber templates are embedded between the tunnel segment and the L-shaped steel template.

[0006] Furthermore, the horizontal end of the L-shaped steel template is a sloping structure.

[0007] Furthermore, each piece of square timber in the aforementioned timber assembly has several grooves along its longitudinal axis. The lower opening of the groove is semi-circular, and its radius is consistent with the radius of the second horizontal support screw. The upper opening of the groove is slightly wider than the radius of the second horizontal support screw.

[0008] Furthermore, the thickness of the end wooden formwork is consistent with that of the L-shaped steel formwork.

[0009] Furthermore, one end of the end formwork is a sloping structure, and the slope of the sloping surface is consistent with the horizontal end of the L-shaped steel formwork; the other end of the end formwork is an arc surface, and the curvature of the arc surface is consistent with the inner arc surface of the tunnel segment.

[0010] The beneficial effects of this invention are:

[0011] This invention solves the problem of long construction cycles due to repeated disassembly and assembly of truss support systems in narrow and irregular spaces outside the internal sidewalls of circular tunnels. Furthermore, the formwork structure used for pouring the inner slab edges of shield tunnels in this invention is simple in form, easy to manufacture, and has straightforward disassembly and assembly steps, effectively improving the efficiency of internal structure pouring construction in tunnel engineering. Attached Figure Description

[0012] Figure 1 is a front view of the formwork for casting the inner middle plate edge of the shield tunnel according to the present invention;

[0013] Figure 2 is a schematic diagram of the square timber structure;

[0014] Figure 3 is a schematic diagram of step 1 in the embodiment;

[0015] Figure 4 is a schematic diagram of step 2 in the embodiment;

[0016] Figure 5 is a schematic diagram of step 3 in the embodiment;

[0017] Figure 6 is a schematic diagram of step 4 in the embodiment;

[0018] Figure 7 is a schematic diagram of step 5 in the embodiment;

[0019] In the figure, 1 is the first horizontal support screw, 101 is the first horizontal support screw handle, 2 is the second horizontal support screw, 201 is the second horizontal support screw handle, 3 is square timber, 4 is L-shaped steel formwork, 5 is end timber formwork, 6 is tunnel segment, 7 is internal structural side wall, and 8 is cast-in-place middle slab and middle slab edge concrete. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Note that the following description of the embodiments is merely illustrative and is not intended to limit its applicability or use, nor is the present invention limited to the following embodiments.

[0021] Example:

[0022] As shown in Figures 1 and 2, a formwork for casting the inner middle plate edge of a shield tunnel includes a first horizontal support screw assembly, a second horizontal support screw assembly, a square timber assembly, an L-shaped steel formwork 4, and an end timber formwork 5.

[0023] The first horizontal support screw assembly is placed horizontally, and the extension length of the first horizontal support screw 1 is adjusted by rotating the first horizontal support screw handle 101 on each first horizontal support screw 1.

[0024] The square timber group is placed on top of the first horizontal support screw group, and the longitudinal axis of each square timber 3 is perpendicular to the axis of the first horizontal support screw 1.

[0025] The square timber 3 has several grooves along its longitudinal axis. The lower opening of the groove is semi-circular, and its radius is consistent with the radius of the second horizontal support screw 2. The upper opening of the groove is slightly wider than the radius of the second horizontal support screw.

[0026] The second horizontal support screw assembly passes through the groove on each square timber 3, and the extension length of the second horizontal support screw 2 is adjusted by rotating the second horizontal support screw handle 201 on each second horizontal support screw 2.

[0027] One end of the second horizontal support screw 2 rests against the vertical surface of the L-shaped steel template 4.

[0028] The horizontal surface of the L-shaped steel formwork 4 is placed on top of the square timber assembly, and the horizontal end of the L-shaped steel formwork 4 has a sloping structure.

[0029] The thickness of the end wooden formwork 5 is the same as that of the L-shaped steel formwork 4. One end of the end wooden formwork 5 is a sloping structure, and the slope of the sloping surface is the same as that of the horizontal end of the L-shaped steel formwork 4; the other end of the end wooden formwork 5 is an arc surface, and the curvature of the arc surface is the same as that of the inner arc surface of the tunnel segment.

[0030] In this embodiment, the tunnel segments are assembled before the internal structure. The side walls of the internal structure have been poured and cured, and the formwork trolley for the middle slab of the internal structure is in place at the pouring position. The formwork used for pouring the middle slab of the shield tunnel is shown in Figures 3 to 7, and includes the following steps:

[0031] Step 1: Based on the design elevation of the bottom edge of the internal structure's panel, the template thickness, and the height of the square timber, determine the center height of the first horizontal support screw 1 and mark it on the surfaces of the tunnel segment 6 and the internal structure's side wall 7. Attach a rubber pad to the end of the first horizontal support screw 1 that contacts the tunnel segment 6, and place the first horizontal support screw 1 horizontally, ensuring its center is accurately aligned with the marks on the tunnel segment 6 and the side wall 7. The first horizontal support screw handle 101 uses a ratchet structure; simply turning the handle back and forth within a small range allows for screw extension and retraction. Adjusting the extension length of the first horizontal support screw 1 by rotating the handle 101 ensures it is securely installed between the tunnel segment 6 and the side wall 7.

[0032] Step 2: In a preferred embodiment of the formwork for casting the inner slab edge of a shield tunnel according to the present invention, three square timbers 3 are placed at equal intervals on the upper part of the first horizontal support screw 1, with the longitudinal axis of each square timber 3 perpendicular to the axis of the first horizontal support screw 1. The second horizontal support screw 2 is passed through the groove on the square timber 3 and firmly embedded in the semi-circular lower opening of the groove.

[0033] Step 3: In a preferred embodiment of the formwork for casting the inner middle slab edge of a shield tunnel according to the present invention, an L-shaped steel formwork 4 is placed on top of the square timber 3, with the vertical surface of the steel formwork overlapping the side wall 7. The second horizontal support screw handle 201 adopts a ratchet structure, and the extension and retraction of the screw can be achieved by simply turning the handle back and forth within a small range. A rubber pad is attached to the end of the second horizontal support screw 2 that contacts the tunnel segment 6, and the extension length of the second horizontal support screw is adjusted by rotating the handle 201 to securely install it between the vertical surface of the tunnel segment 6 and the L-shaped steel formwork 4.

[0034] Step 4: Insert the end wooden template 5 between the pipe segment 6 and the L-shaped steel template 4, and gently tap it with a wooden mallet to make the upper surface of the end wooden template 5 flush with the upper surface of the horizontal surface of the L-shaped steel template 4.

[0035] Step 5: Cast the middle slab and the edge slab concrete in one piece. After the concrete reaches the curing strength, disassemble the first horizontal support screw assembly, the square timber assembly, the second horizontal support screw assembly, the L-shaped steel formwork 4, and the end wooden formwork 5 in sequence.

[0036] The embodiments of the present invention have been described in detail above, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent changes and improvements made based on the present invention are still within the scope of this patent.

Claims

1. A construction method for a formwork used for casting the inner middle slab edge section of a shield tunnel, characterized in that: The formwork includes a first horizontal support screw assembly, a second horizontal support screw assembly, square timber assemblies, L-shaped steel templates, and end wooden templates. The first horizontal support screw assembly is placed horizontally, and its extension / retraction length is adjusted by rotating the handle on each first horizontal support screw. The square timber assemblies are placed on top of the first horizontal support screw assembly, with the longitudinal axis of each square timber perpendicular to the axis of the first horizontal support screw assembly. The second horizontal support screw assembly passes through grooves in each square timber, and its extension / retraction length is adjusted by rotating the handle on each second horizontal support screw. The second horizontal support screw assembly has one end abutting against the vertical surface of the L-shaped steel template; the horizontal surface of the L-shaped steel template is placed on top of the square timber assembly, and the end wooden template is embedded between the tunnel segment and the L-shaped steel template; the steps of this method are as follows: Step 1: Determine the center height of the first horizontal support screw according to the design elevation of the bottom edge of the internal structure plate, the template thickness, and the height of the square timber, and mark it on the surface of the tunnel segment and the side wall of the internal structure; attach a rubber pad to the end of the first horizontal support screw that contacts the tunnel segment, and place the first horizontal support screw horizontally so that its center is accurately aligned with the mark on the tunnel segment and the side wall; The first horizontal support screw handle uses a ratchet structure. Rotating the handle adjusts the extension length of the first horizontal support screw, ensuring it is securely installed between the pipe segment and the side wall. Step two: Place square timbers at equal intervals above the first horizontal support screw, with the longitudinal axis of each timber perpendicular to the axis of the first horizontal support screw. Pass the second horizontal support screw through the groove on the square timber and securely embed it into the semi-circular lower opening of the groove. Step three: Place an L-shaped steel template on top of the square timber, with the vertical surface of the L-shaped steel template overlapping the side wall. The second horizontal support screw handle uses a ratchet structure. A rubber pad is attached to the end of the support screw that contacts the pipe segment. The extension length of the second horizontal support screw is adjusted by rotating the handle to secure it between the vertical surface of the pipe segment and the L-shaped steel formwork. Step 4: The end wooden formwork is embedded between the pipe segment and the L-shaped steel formwork. The end wooden formwork is gently tapped with a mallet to make the upper surface of the end wooden formwork flush with the upper surface of the horizontal surface of the L-shaped steel formwork. Step 5: The middle slab and the edge of the middle slab are poured in one piece. After the concrete reaches the curing strength, the first horizontal support screw assembly, the square timber assembly, the second horizontal support screw assembly, the L-shaped steel formwork, and the end wooden formwork are disassembled in sequence.

2. The construction method of the formwork for casting the inner middle slab edge section of a shield tunnel according to claim 1, characterized in that: The horizontal end of the L-shaped steel formwork has a sloping structure.

3. The construction method of the formwork for casting the inner middle slab edge section of a shield tunnel according to claim 1, characterized in that: Each piece of square timber in the aforementioned timber assembly has several grooves along its longitudinal axis. The lower opening of the groove is semi-circular, and its radius is consistent with the radius of the second horizontal support screw. The width of the groove opening is slightly larger than the radius of the second horizontal support screw.

4. The construction method of the formwork for casting the inner middle slab edge section of a shield tunnel according to claim 1, characterized in that: The thickness of the end wooden formwork is the same as that of the L-shaped steel formwork.

5. The construction method of the formwork for casting the inner middle slab edge section of a shield tunnel according to claim 4, characterized in that: One end of the end formwork is a sloping surface with a slope consistent with the horizontal end of the L-shaped steel formwork; the other end of the end formwork is an arc surface with a curvature consistent with the inner arc surface of the tunnel segment.

Images