Plastic steel form structure for tunnel secondary lining construction

Abstract

This utility model discloses a plastic-steel formwork structure for tunnel secondary lining construction, relating to the field of tunnel construction technology. It includes a connecting plate, an inclined plate, and an mounting plate. The connecting plate is bolted to the ground and is horizontally positioned. The inclined plate is inclined, with its upper end abutting against the wall and its lower end connected to the connecting plate. Mounting holes are provided on the inclined plate, aligned vertically with the bolts. The mounting plate is detachably connected to the inclined plate and is used to seal the mounting holes. This utility model employs a modular installation method, which improves construction efficiency.

Description

Technical Field

[0001] This utility model relates to the field of tunnel construction technology, and in particular to a plastic steel mold structure for tunnel secondary lining construction. Background Technology

[0002] Traditional tunnel secondary lining concrete formwork construction often faces numerous challenges that impact work efficiency. The combination of traditional steel formwork and triangular rubber strips is typically large and heavy, making installation and transportation time-consuming and labor-intensive. Formwork positioning, leveling, and fixing rely on repeated manual measurements and adjustments; the insertion and tightening of anchor bolts is cumbersome due to limited space. Grout leakage is common at joints between formwork sections and with existing structures, leading to substantial post-construction cleaning and repair work and potentially delaying subsequent processes. The formwork support system is complex and difficult to assemble and disassemble. These factors collectively result in long construction cycles, high labor intensity, strong reliance on worker skills, and the risk of quality fluctuations, severely restricting construction efficiency. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a plastic-steel formwork structure for tunnel secondary lining construction, which can improve construction efficiency.

[0004] A plastic steel formwork structure for tunnel secondary lining construction according to an embodiment of this utility model includes: a connecting plate, an inclined plate, and a mounting plate. The connecting plate is connected to the ground by bolts and is horizontally arranged; the inclined plate is inclined, with its upper end abutting against the wall and its lower end connected to the connecting plate; the inclined plate has mounting holes aligned vertically with the bolts; the mounting plate is detachably connected to the inclined plate and is used to close the mounting holes.

[0005] According to an embodiment of this utility model, a plastic steel formwork structure for tunnel secondary lining construction has at least the following beneficial effects: Construction workers can disassemble the mounting plate and install holes to place and tighten bolts. Workers only need to temporarily disassemble the mounting plate to vertically insert bolts from the front and tighten them using tools. This effectively improves construction efficiency, and the modular installation method enhances work efficiency. The detachable mounting plate facilitates cleaning and disassembly of the bolt area after the formwork is removed. The overall structure is durable, can be reused multiple times, and has low amortization costs.

[0006] According to some embodiments of the present invention, a sealing ring is provided around the side of the mounting plate, and the sealing ring is used to seal the gap between the mounting plate and the mounting hole.

[0007] According to some embodiments of the present invention, the mounting hole has a chamfered edge on the side away from the connecting plate to form a sealing surface, and the sealing ring can abut against the sealing surface.

[0008] According to some embodiments of the present invention, a first bracket is provided at the upper end of the connecting plate, and a second bracket is provided at the lower end of the mounting plate. An elastic element is connected between the first bracket and the second bracket, and the elastic element is used to fix the mounting plate in the mounting hole.

[0009] According to some embodiments of the present invention, a sleeve is vertically provided at the upper end of the connecting plate, and a fixing hole is provided in the connecting plate. The fixing hole is located inside the sleeve, and the bolt passes through the sleeve and the fixing hole.

[0010] According to some embodiments of the present invention, a sealing strip is provided at the upper end of the inclined plate, and the sealing strip is used to seal the gap between the inclined plate and the wall.

[0011] According to some embodiments of the present invention, a protrusion is connected to the left end of the connecting plate and the inclined plate, and a groove is connected to the right end of the connecting plate and the inclined plate, wherein the size of the protrusion and the size of the groove are matched.

[0012] According to some embodiments of the present invention, the included angle between the connecting plate and the inclined plate is 40 degrees to 50 degrees.

[0013] According to some embodiments of this utility model, both the connecting plate and the inclined plate are composite materials of polyvinyl chloride and steel plate.

[0014] According to some embodiments of the present invention, the connecting plate has an anti-slip layer on the side closest to the ground.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the overall cross-section of an embodiment of the present invention. Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 This is a schematic diagram of bolt installation according to one embodiment of the present invention; Figure 4 This is a schematic diagram of the bottom surface of the connecting plate according to one embodiment of the present invention.

[0017] Icon labels: Connecting plate 100, ground 101, wall 102, fixing hole 110, protrusion 120, groove 130; Bolt 200; Inclined plate 300, mounting hole 310, sealing surface 311; Mounting plate 400, sealing ring 410; First support 500; Second support 600; Elastic component 700; Sleeve 800; Sealing strip 900. Detailed Implementation

[0018] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0019] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] In the description of this utility model, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features or their sequential relationship.

[0021] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0022] Reference Figures 1 to 4As shown, an embodiment of the present invention discloses a plastic steel formwork structure for tunnel secondary lining construction, comprising: a connecting plate 100, an inclined plate 300, and an mounting plate 400. The connecting plate 100 is connected to the ground 101 by bolts 200 and is horizontally positioned. The inclined plate 300 is inclined, with its upper end abutting against a wall 102, which is perpendicular to the ground 101. The wall 102 and the ground 101 are mounting surfaces in the installation environment. The connecting plate 100 serves to fix the inclined plate 300, which forms a slope to block concrete, allowing it to be molded into a preset shape. By being inclined and abutting against the wall 102, the inclined plate 300 ensures that the poured concrete can be accurately molded into specific contours required by the design, such as V-grooves, drainage slopes, and structural transition surfaces. The lower end of the inclined plate 300 is connected to the connecting plate 100, and the connecting plate 100 and the inclined plate 300 are integrally formed, a design that enhances the structural strength of the connection. The inclined plate 300 has mounting holes 310 aligned vertically with the bolts 200. A mounting plate 400 is detachably connected to the inclined plate 300 and seals the mounting holes 310. Workers can remove the mounting plate 400 and use the mounting holes 310 to place and tighten the bolts 200. Workers only need to temporarily remove the mounting plate 400 to vertically insert the bolts 200 from the front and tighten them using tools. This significantly reduces operational difficulty, and the modular installation improves work efficiency. The detachable mounting plate 400 facilitates cleaning and removal of the bolt area after the template is removed. The overall structure is durable, can be reused multiple times, and has low amortization costs.

[0023] Reference Figure 2 As shown, in some embodiments, a sealing ring 410 is provided around the side of the mounting plate 400. The sealing ring 410 is used to seal the gap between the mounting plate 400 and the mounting hole 310. Concrete grout is permeable under pressure and may leak from the assembly gap between the mounting plate 400 and the mounting hole 310 on the inclined plate 300. The sealing ring 410 is made of a highly elastic material such as rubber or silicone to seal the gap between the mounting plate 400 and the mounting hole 310, preventing concrete grout from leaking from around the mounting hole 310.

[0024] Reference Figure 2 and Figure 3As shown, in some embodiments, the edge of the mounting hole 310 away from the connecting plate 100 is chamfered to form a sealing surface 311, and the sealing ring 410 can abut against the sealing surface 311. During installation, the sealing ring 410 is naturally guided and placed on the conical surface formed by the chamfer. The chamfer design makes the extrusion process gradual, which can achieve a better static sealing effect. The mounting hole 310 is conical in shape, so that after the mounting plate 400 is inserted into the mounting hole 310, it cannot continue to pass downward through the mounting hole 310. The mounting plate 400 is fixed in the mounting hole 310 so that the outer surface of the mounting plate 400 is flush with the inclined plate 300, making the surface of the concrete after molding smooth and easy to demold.

[0025] Reference Figure 1 As shown, in some embodiments, a first bracket 500 is welded to the upper end of the connecting plate 100, and a second bracket 600 is welded to the lower end of the mounting plate 400. The first bracket 500 and the second bracket 600 can be simple lugs or hooks. An elastic element 700 connects the first bracket 500 and the second bracket 600, and the elastic element 700 is used to fix the mounting plate 400 within the mounting hole 310. The elastic element 700 can be a tension spring or a rubber band. The function of the elastic element 700 is to continuously provide a pulling force towards the first bracket 500 to the mounting plate 400, preventing the mounting plate 400 from detaching from the mounting hole 310. The mounting plate 400 will not completely detach from the connecting plate 100 and the inclined plate 300, avoiding accidental drop of the mounting plate 400 into complex construction sites after disassembly, which could result in component loss. The operator can remove the mounting plate 400 without constantly holding it by hand. Under the tension of the elastic element 700, the mounting plate 400 will automatically hang or adhere to the vicinity. The elastic element 700 can also press the sealing ring 410 against the chamfered sealing surface 311 to improve the sealing effect.

[0026] Reference Figure 1 As shown, in some embodiments, a sleeve 800 is vertically welded to the upper end of the connecting plate 100. The connecting plate 100 has a fixing hole 110 located inside the sleeve 800. The tail of the bolt 200 passes through the sleeve 800 and the fixing hole 110 and is connected to the ground 101. The head of the bolt 200 abuts against the sleeve 800. The function of the sleeve 800 is to initially position and guide the bolt 200, so that the bolt 200 can be installed and removed using tools in the narrow space between the connecting plate 100 and the inclined plate 300. The inner wall of the sleeve 800 ensures the inclination angle of the bolt 200, so that the bolt 200 remains vertical after being placed in the sleeve 800. When placing the connecting plate 100, workers can visually or with simple tools ensure that several sleeves 800 are roughly aligned with the anchor points or marks pre-embedded in the ground 101, achieving rapid initial positioning of the connecting plate 100.

[0027] Reference Figure 1 and Figure 3As shown, in some embodiments, a sealing strip 900 is provided at the upper end of the inclined plate 300. The sealing strip 900 is used to seal the gap between the inclined plate 300 and the wall 102. The sealing strip 900 is made of silicone and rubber. During installation, due to unevenness of the wall 102, misalignment of the inclined plate 300, etc., gaps inevitably exist between the inclined plate 300 and the wall 102. The sealing strip 900 fills the gaps between the inclined plate 300 and the wall 102 to prevent concrete leakage.

[0028] Reference Figure 3 and Figure 4 As shown, in some embodiments, the left ends of the connecting plate 100 and the inclined plate 300 are connected to a protrusion 120, and the right ends of the connecting plate 100 and the inclined plate 300 are connected to a groove 130. The dimensions of the protrusion 120 and the groove 130 are matched. When using multiple tunnel secondary lining construction plastic steel mold structures, the protrusion 120 is embedded into the groove 130 of the adjacent tunnel secondary lining construction plastic steel mold structure for connection. The groove 130 and the protrusion 120 are precisely aligned, ensuring the flatness and smoothness of the concrete pouring surface after large-scale assembly. The interlocking protrusion 120 and groove 130 transfer loads between adjacent tunnel secondary lining construction plastic steel mold structures, enabling multiple independent tunnel secondary lining construction plastic steel mold structures to support each other in the circumferential direction, increasing the structural strength to effectively resist the lateral pressure during concrete pouring.

[0029] Reference Figure 1 As shown, in some embodiments, the included angle between the connecting plate 100 and the inclined plate 300 is 40 to 50 degrees. The included angle between the connecting plate 100 and the inclined plate 300 is determined by the angle required for the concrete to be formed.

[0030] Reference Figure 1 As shown, in some embodiments, both the connecting plate 100 and the inclined plate 300 are composite materials of polyvinyl chloride (PVC) and steel plate. The PVC coating on the steel plate surface is smooth, effectively preventing concrete adhesion, enabling easy demolding, and ensuring a smooth surface after concrete molding. The steel plate provides structural stability, making the connecting plate 100 and inclined plate 300 less prone to deformation, ensuring accurate molding dimensions. The PVC layer is corrosion-resistant and wear-resistant, extending its service life in humid and dusty tunnel environments and reducing long-term maintenance costs.

[0031] Reference Figure 1 As shown, in some embodiments, the connecting plate 100 has an anti-slip layer on the side near the ground 101. The advantage of having an anti-slip layer on the side of the connecting plate 100 near the ground 101 is that it increases the friction between the connecting plate 100 and the ground 101, assists in the initial positioning of the connecting plate 100 before the bolts 200 are fully tightened, and prevents the connecting plate 100 from sliding during installation and adjustment or when subjected to accidental external forces.

[0032] Usage steps: Hoist the connecting plate 100 and the inclined plate 300 to the preset position, and precisely align and assemble them using the protrusions 120 and grooves 130 on the sides to form a continuous template surface. After assembly, check whether the sealing strip 900 at the upper end of the inclined plate 300 is in contact with the wall surface 102. Then, use a suction cup or magnet to attract the mounting plate 400, and then remove the mounting plate 400. Guided by the exposed mounting hole 310 and sleeve 800, vertically insert the bolt 200 and initially screw it into the anchor point of the ground 101, ensuring that the connecting plate 100 is compacted against the ground 101. Afterward, push the mounting plate 400 back into the mounting hole 310. Pour concrete, and after the concrete reaches the demolding strength, remove the template on the outside of the concrete, clean and maintain it for future reuse.

[0033] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A plastic-steel formwork structure for tunnel secondary lining construction, characterized in that, include: A connecting plate (100) is connected to the ground (101) by bolts (200), and the connecting plate (100) is horizontally arranged; An inclined plate (300) is inclined, with its upper end abutting against the wall (102) and its lower end connected to the connecting plate (100). An installation hole (310) is provided on the inclined plate (300), and the installation hole (310) is aligned with the bolt (200) in the vertical direction. Mounting plate (400), which is detachably connected to the inclined plate (300), is used to close the mounting hole (310).

2. The plastic-steel formwork structure for tunnel secondary lining construction according to claim 1, characterized in that: A sealing ring (410) is provided around the side of the mounting plate (400), and the sealing ring (410) is used to seal the gap between the mounting plate (400) and the mounting hole (310).

3. The plastic steel formwork structure for tunnel secondary lining construction according to claim 2, characterized in that: The mounting hole (310) has a chamfered edge on the side away from the connecting plate (100) to form a sealing surface (311), and the sealing ring (410) can abut against the sealing surface (311).

4. The plastic steel formwork structure for tunnel secondary lining construction according to claim 3, characterized in that: The upper end of the connecting plate (100) is provided with a first bracket (500), and the lower end of the mounting plate (400) is provided with a second bracket (600). An elastic element (700) is connected between the first bracket (500) and the second bracket (600). The elastic element (700) is used to fix the mounting plate (400) in the mounting hole (310).

5. The plastic-steel formwork structure for tunnel secondary lining construction according to claim 1, characterized in that: A sleeve (800) is vertically provided on the upper end of the connecting plate (100). The connecting plate (100) has a fixing hole (110) located inside the sleeve (800). The bolt (200) passes through the sleeve (800) and the fixing hole (110).

6. The plastic-steel formwork structure for tunnel secondary lining construction according to claim 1, characterized in that: The upper end of the inclined plate (300) is provided with a sealing strip (900), which is used to seal the gap between the inclined plate (300) and the wall (102).

7. The plastic steel formwork structure for tunnel secondary lining construction according to claim 1, characterized in that: The left end of the connecting plate (100) and the inclined plate (300) is connected to a protrusion (120), and the right end of the connecting plate (100) and the inclined plate (300) is connected to a groove (130). The size of the protrusion (120) and the size of the groove (130) are matched.

8. The plastic steel formwork structure for tunnel secondary lining construction according to claim 1, characterized in that: The included angle between the connecting plate (100) and the inclined plate (300) is 40 to 50 degrees.

9. The plastic-steel formwork structure for tunnel secondary lining construction according to claim 1, characterized in that: Both the connecting plate (100) and the inclined plate (300) are composite materials of polyvinyl chloride and steel plate.

10. The plastic-steel formwork structure for tunnel secondary lining construction according to claim 1, characterized in that: The connecting plate (100) has an anti-slip layer on the side closest to the ground (101).

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