A formwork system for a tunnel lining structure

Abstract

The utility model relates to the field of formwork engineering, concretely relates to a formwork system for tunnel secondary lining structure, including main formwork and second formwork. Main formwork is used for forming secondary lining structure, and the end of main formwork is equipped with end plate, and end plate is towards the inboard of main formwork. Second formwork is arranged along the ring of main formwork, and second formwork includes fixed plate and steel bar, and steel bar is connected with fixed plate, and steel bar is equipped with bevel and splicing surface, and bevel is used for forming the V type construction joint of secondary lining structure, and splicing surface can be connected with the outer wall of main formwork, and fixed plate is detachably connected with end plate. The utility model can realize the assembly type connection of second formwork and main formwork through the detachable connection of fixed plate and end plate, thereby effectively avoid the local deformation influence caused by high temperature in the welding process to second formwork and main formwork. Due to the reduction of the local deformation of second formwork and main formwork, the dimensional accuracy of V type construction joint is higher, and the shape is more regular, and then the construction quality of V type construction joint is improved.

Description

Technical Field

[0001] This utility model relates to the field of formwork engineering, and in particular to a formwork system for tunnel secondary lining structures. Background Technology

[0002] In the construction of tunnel secondary lining structures, to improve the stability and sealing of the lining ring, V-shaped construction joints are usually installed on the secondary lining structure along the circumferential direction of the tunnel. This means the V-shaped construction joint extends in the same direction as the tunnel circumference. These V-shaped construction joints can actively release stress, effectively preventing cracking of the secondary lining structure due to concrete shrinkage.

[0003] Currently, a common method for forming V-shaped construction joints is to weld V-shaped steel bars onto the formwork of the secondary lining structure, using these bars to create the desired V-shaped joint shape. However, when connecting the V-shaped steel bars to the secondary lining formwork by welding, the high temperatures generated during the welding process can cause localized deformation of both the steel bars and the formwork. This localized deformation can negatively impact the construction quality of the V-shaped construction joint, such as reducing its dimensional accuracy and causing irregularities in its shape. Utility Model Content

[0004] The purpose of this invention is to overcome the problem of poor construction quality of V-shaped construction joints caused by V-shaped steel bars on the formwork of secondary lining structures in existing technologies. Therefore, a formwork system for tunnel secondary lining structures is provided.

[0005] This utility model provides a template system for tunnel secondary lining structures, comprising: The main template is used to form the secondary lining structure. The end of the main template is provided with an end plate facing the inside of the main template. The second template is arranged circumferentially along the main template. The second template includes a fixing plate and steel bars. The steel bars are connected to the fixing plate. The steel bars have inclined surfaces and splicing surfaces. The inclined surfaces are used to form the V-shaped construction joint of the secondary lining structure. The splicing surfaces can be connected to the outer wall of the main template. The fixing plate is detachably connected to the end plate.

[0006] This invention provides a template system for tunnel secondary lining structures. The main template is used to form the tunnel secondary lining structure. The end plate serves as an attachment support for fixing the second template, providing a stable attachment point for the second template. The fixing plate connects the second template to the end plate, and the inclined surface of the second template forms a V-shaped construction joint for the secondary lining structure at the end of the main template. The splicing surface of the second template connects to the outer wall of the main template. The detachable connection between the fixing plate and the end plate enables an assembled connection between the second template and the main template. Compared to traditional welding methods, the assembled connection eliminates the need for welding between the second template and the main template, effectively avoiding the local deformation caused by the high temperatures generated during welding. Due to the reduced local deformation of the second template and the main template, the V-shaped construction joint has higher dimensional accuracy and a more regular shape, thereby improving the construction quality of the V-shaped construction joint.

[0007] The fixing plate and the end plate can be detachably connected by means of clamp connection, snap-fit ​​connection or bolt connection.

[0008] Preferably, the end plate and the fixing plate are respectively provided with a first screw hole and a second screw hole, and the end plate and the fixing plate are connected by bolts passing through the first screw hole and the second screw hole. Compared with the clamp connection method, this solution uses bolt connection, which eliminates the need for additional clamp components and is simple and quick to operate, greatly improving the efficiency of installation and disassembly. Compared with the snap-fit ​​connection method, this solution provides a more reliable and durable connection through the preload applied by the bolt connection, effectively ensuring the stability of the connection between the end plate and the fixing plate.

[0009] Preferably, a groove is provided on the fixing plate at the end of the second screw hole away from the end plate, the groove being able to accommodate the end of the bolt. In this design, after the bolt is tightened, the end of the bolt can be located in the groove, thus preventing the end of the bolt from protruding from the surface of the fixing plate, effectively avoiding various potential impacts caused by the protruding bolt end. For example, it reduces the risk of interference or collision with other components; at the same time, it also makes the overall appearance of the template smoother and more aesthetically pleasing, improving the overall quality of the product.

[0010] The end of the bolt can be a hexagonal head or an internal hexagonal cylindrical head.

[0011] Preferably, the bolt end is a cylindrical head with an internal hexagonal groove. If a hexagonal head is used as the bolt end, sufficient operating space is required when tightening the hexagonal head bolt with a wrench and socket, necessitating a relatively large space between the groove and the bolt end. In this design, however, tightening the bolt can be achieved simply by inserting an internal hexagonal wrench into the groove, effectively reducing the size of the groove.

[0012] At the end of the same main template, the second template may be a single section or divided into several segments.

[0013] Preferably, the second template comprises several segments. In this design, dividing the second template into multiple segments effectively reduces the difficulty of its installation. When a portion of the second template is damaged or deformed, simply disassemble the problematic segment, replace it, and install a new one.

[0014] Preferably, a sealing gasket is provided between the splicing surface and the outer wall of the main template. In this design, the sealing gasket can enhance the sealing effect between the splicing surface and the outer wall of the main template, reducing the occurrence of grout leakage.

[0015] The sealing gasket can be a rubber gasket or a foam sealing strip.

[0016] Preferably, the sealing gasket is a rubber gasket. Compared to foam sealing strips, the rubber gasket has better durability and can withstand multiple uses under normal operating conditions without easily being damaged, resulting in a longer service life.

[0017] Preferably, the angle between the inclined surface and the splicing surface is 50°-70°.

[0018] Preferably, the outer wall of the main formwork and the inclined surface are both provided with an anti-stick coating. In this design, the anti-stick coating can effectively reduce the adhesion between the main formwork and the inclined surface and the concrete structure, thereby reducing adhesion during demolding and making the demolding operation smoother and more efficient.

[0019] The anti-stick coating may be polytetrafluoroethylene, silicone coating, or epoxy resin coating.

[0020] Preferably, the anti-stick coating is a polytetrafluoroethylene (PTFE) coating with a thickness of 0.1 mm to 0.5 mm. Compared to silicone coatings and epoxy resin coatings, the PTFE coating has better anti-stick properties, further improving the smoothness of demolding operations and construction efficiency.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention provides a formwork system for tunnel secondary lining structures. The fixed plate and end plate are detachably connected, enabling an assembled connection between the second formwork and the main formwork. Compared to traditional welding methods, this assembled connection eliminates the need for welding between the second and main formwork, effectively avoiding the localized deformation caused by the high temperatures generated during welding. By reducing localized deformation of the second and main formwork, the V-shaped construction joint achieves higher dimensional accuracy and a more regular shape, thereby improving the construction quality of the V-shaped construction joint. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural schematic diagram of a template system used for tunnel secondary lining structures.

[0023] Figure 2 for Figure 1 Enlarged detailed view of area A in the middle.

[0024] Figure 3 This is a side view of a template system used for tunnel secondary lining structures.

[0025] Figure 4 This is a front view of a template system for tunnel secondary lining structures.

[0026] Figure 5 for Figure 4 Cross-sectional view of the BB section line.

[0027] Figure 6 A three-dimensional structural diagram of the main template.

[0028] Figure 7 for Figure 6 Enlarged detail of region C.

[0029] Figure 8 This is a schematic diagram of the first-person perspective of the second template.

[0030] Figure 9 This is a schematic diagram of the second perspective of the second template.

[0031] Marked in the image: 1-Main Template 11-End plate, 111-First screw hole 2-Second template, 21-Fixing plate, 211-Second screw hole, 212-Groove, 22-Steel strip, 221-Beveled surface, 222-Jointing surface 3- Bolts, 31-Internal hexagonal socket, 4-Nuts. Detailed Implementation

[0032] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0033] Unless otherwise specified, the terms "upper," "lower," "left," "right," "center," "inner," and "outer" used in the description of specific embodiments of this utility model to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is usually placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, and for enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0034] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," "parallel," and "coaxial" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, parallel, or coaxial. Slight tilt or deviation is permissible, as long as it does not affect the normal function of the relevant component. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," not that the structure must be perfectly horizontal; a slight tilt is acceptable. "Coaxial" means that two components are arranged as coaxially as possible, allowing them to move coaxially or approximately coaxially when their relative positions change. Alternatively, it can be simplified to mean that the corresponding device / component / element, when arranged in "horizontal," "vertical," "suspended," "parallel," or "coaxial" directions, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. For example, the deviation in the "coaxial" direction is controlled within 0.2-1mm, preferably within 0.2-0.5mm. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0035] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0036] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0037] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "provided with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0038] Example 1 like Figures 1 to 9 As shown, a template system for a tunnel secondary lining structure includes a main template 1 and a second template 2.

[0039] The main template 1 is used to form the secondary lining structure. The end of the main template 1 is provided with an end plate 11, which faces the inner side of the main template 1. Specifically, the end plate 11 is arranged circumferentially along the entire length of the end of the main template 1. The width of the end plate 11 can be 80mm-150mm, and the thickness of the end plate 11 can be 10mm-15mm. The main template 1 can be installed on the secondary lining trolley.

[0040] The second template 2 is arranged circumferentially around the main template 1. The second template 2 includes a fixing plate 21 and steel bars 22. The steel bars 22 are connected to the fixing plate 21 and have a bevel 221 and a splicing surface 222. The bevel 221 is used to form the V-shaped construction joint of the secondary lining structure. The splicing surface 222 can be connected to the outer wall of the main template 1. The fixing plate 21 is detachably connected to the end plate 11. Specifically, both the fixing plate 21 and the steel bars 22 can be made of steel. The splicing surface 222 is adapted to the outer wall of the main template 1 to ensure close contact between the splicing surface 222 and the outer wall of the main template 1. The steel bars 22 can be a solid structure or a hollow structure.

[0041] In an optional embodiment, the end plate 11 and the fixing plate 21 may be provided with a first screw hole 111 and a second screw hole 211, respectively. The end plate 11 and the fixing plate 21 are connected by bolts 3 passing through the first screw hole 111 and the second screw hole 211. Specifically, the bolts 3 and the nuts 4 are used to fasten the end plate 11 and the fixing plate 21 together. The nuts 4 are located on the side of the end plate 11 away from the fixing plate 21.

[0042] In an optional embodiment, a groove 212 may be provided on the fixing plate 21 at the end of the second screw hole 211 away from the end plate 11. The groove 212 can accommodate the end of the bolt 3. Specifically, the depth of the groove 212 is greater than or equal to the thickness of the end of the bolt 3.

[0043] In an optional embodiment, the end of the bolt 3 can be a cylindrical head, and the cylindrical head can be provided with an internal hexagonal groove 31. Specifically, the cross-sectional shape of the groove 212 is circular, and the gap between the inner wall of the groove 212 and the end of the bolt 3 can be 1mm-2mm. The diameter of the circumcircle of the internal hexagonal groove 31 can be 15mm-26mm.

[0044] In an optional embodiment, the second template 2 may include several segments. Specifically, the number of segments may be 2, 3, 4, 5, 6, 7, or 8. During installation, adjacent segments are tightly connected to reduce grout leakage at the connection points. A sealing strip may also be provided between adjacent segments to further reduce grout leakage. The fixing plate 21 of each segment is connected to the end plate 11 of the main template 1 by at least two bolts 3.

[0045] In an optional embodiment, a sealing gasket may be provided between the splicing surface 222 and the outer wall of the main template 1. The sealing gasket may be fixed to the splicing surface 222 by adhesive.

[0046] In an optional embodiment, the sealing gasket may be a rubber gasket. Specifically, the thickness of the rubber gasket may be 1mm-3mm.

[0047] In an optional embodiment, the angle between the inclined surface 221 and the splicing surface 222 can be 50°-70°, specifically 50°, 55°, 60°, 65°, or 70°.

[0048] In an optional embodiment, the outer wall and inclined surface 221 of the main template 1 may be provided with an anti-stick coating.

[0049] In an optional embodiment, the anti-stick coating may be a polytetrafluoroethylene (PTFE) coating, and the thickness of the PTFE coating may be 0.1mm-0.5mm, specifically 0.1mm, 0.2mm, 0.3mm, 0.4mm, or 0.5mm.

[0050] Before processing the second template 2, the overall length, width and height required for the second template 2 are calculated based on the radius and thickness of the main template 1. Then, the dimensions of the fixing plate 21 and steel strip 22 are determined to ensure that the second template 2 can be closely attached to the main template 1, so as to avoid the insecure fixing affecting the construction quality.

[0051] In the traditional method of connecting V-shaped steel bars to the secondary lining formwork by welding, the surface of the V-shaped steel bars is prone to damage, roughness, or deformation after multiple concrete pouring operations. Once the V-shaped steel bars are no longer usable, they need to be cut and removed, and then new V-shaped steel bars need to be installed. This requires a series of tedious processes such as welding and grinding, which seriously affects the construction efficiency of the secondary lining structure.

[0052] The template system for tunnel secondary lining structure provided by this utility model can be detachably connected to the end plate 11 via the fixing plate 21, which enables the quick separation and reinstallation of the second template 2 from the main template 1. This facilitates rapid replacement when the second template 2 is damaged or deformed, thereby shortening construction downtime and improving the construction efficiency of the secondary lining structure.

[0053] The template system for tunnel secondary lining structures provided by this utility model also has the following advantages: 1. Simple processing and installation: This solution uses common steel plates commonly used in construction for processing and fabrication. The materials are readily available and the processing is simple. The main template 1 and the second template 2 can be simply connected and fixed with bolts 3, making installation and disassembly simple and efficient.

[0054] 2. High strength: The second template 2 used for forming V-shaped construction joints can be made of high-strength steel plate as the main material. It is not easy to deform or break during use and construction, which reduces the manpower consumed due to substandard V-shaped construction joints in the later stage.

[0055] 3. The formwork in this scheme is standardized and aesthetically pleasing. It can be centrally processed by the steel bar processing plant according to the designed structural dimensions. The formwork is uniform in size and has the characteristics of straight line and flat surface after installation. It can effectively improve the appearance quality of V-shaped construction joints and meet the current standardization requirements for tunnel construction.

[0056] 4. Reusable: The templates in this scheme can be made of steel plates, which are not easily damaged during construction. They can be repeatedly installed and used during the secondary lining construction of the tunnel, which helps to improve the quality of the circumferential V-shaped construction joint while saving construction costs.

[0057] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A template system for tunnel secondary lining structures, characterized in that, include: Main template (1), the main template (1) is used to form a secondary lining structure, and the end of the main template (1) is provided with an end plate (11), the end plate (11) facing the inner side of the main template (1); The second template (2) is arranged circumferentially along the main template (1). The second template (2) includes a fixing plate (21) and a steel strip (22). The steel strip (22) is connected to the fixing plate (21). The steel strip (22) is provided with a slope (221) and a splicing surface (222). The slope (221) is used to form the V-shaped construction joint of the secondary lining structure. The splicing surface (222) can be connected to the outer wall of the main template (1). The fixing plate (21) is detachably connected to the end plate (11).

2. The template system for tunnel secondary lining structures according to claim 1, characterized in that, The end plate (11) and the fixing plate (21) are respectively provided with a first screw hole (111) and a second screw hole (211). The end plate (11) and the fixing plate (21) are connected by bolts (3) passing through the first screw hole (111) and the second screw hole (211).

3. A template system for tunnel secondary lining structures according to claim 2, characterized in that, On the fixing plate (21), a groove (212) is provided at the end of the second screw hole (211) away from the end plate (11), and the groove (212) can accommodate the end of the bolt (3).

4. A template system for a tunnel secondary lining structure according to claim 3, characterized in that, The end of the bolt (3) is a cylindrical head, and the cylindrical head is provided with an internal hexagonal groove (31).

5. A template system for a tunnel secondary lining structure according to any one of claims 1-4, characterized in that, The second template (2) includes several segments.

6. A formwork system for a tunnel secondary lining structure according to claim 5, characterized in that, A sealing gasket is provided between the splicing surface (222) and the outer wall of the main template (1).

7. A formwork system for a tunnel secondary lining structure according to claim 6, characterized in that, The sealing gasket is a rubber gasket.

8. A template system for a tunnel secondary lining structure according to claim 5, characterized in that, The angle between the inclined surface (221) and the splicing surface (222) is 50°-70°.

9. A formwork system for a tunnel secondary lining structure according to claim 5, characterized in that, The outer wall of the main template (1) and the inclined surface (221) are both provided with an anti-stick coating.

10. A template system for a tunnel secondary lining structure according to claim 9, characterized in that, The anti-stick coating is a polytetrafluoroethylene (PTFE) coating with a thickness of 0.1 mm to 0.5 mm.

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