A inverted arch formwork for tunnel inverted arch construction

Abstract

The utility model provides a kind of inverted arch formwork for tunnel inverted arch construction, including tunnel body, formwork body, trestle mechanism and connecting mechanism.The trestle mechanism is moved and is stably supported by the cooperation of moving wheel in its bottom and lifting support leg;The telescopic connection bridge driven by electric push rod is flexibly adjusted to adapt to different construction span.The connecting mechanism is hooked by hook and connecting seat, and the trestle mechanism and formwork body are linked to realize the synchronous movement and accurate positioning of formwork with trestle.At the same time, the arc inverted arch formwork and connecting frame in formwork body adopt pre-connection structure.The utility model effectively solves the problems of fixed length, inconvenient movement and poor coordination of traditional trestle and formwork, significantly improves the mechanization level and operation efficiency of tunnel inverted arch construction.

Description

Technical Field

[0001] This utility model relates to the field of tunnel invert construction technology, specifically to an invert formwork for tunnel invert construction. Background Technology

[0002] In the field of tunnel construction, the invert arch, as the foundation of the tunnel structure, directly affects the overall stability, durability, and load-bearing capacity of the tunnel. The invert arch formwork is a key piece of equipment for pouring and shaping the invert arch concrete, and its rational design has a decisive impact on construction efficiency and project quality.

[0003] Currently, during tunnel invert construction, trestle bridges are typically used to cross the constructed invert area, providing a working platform and passageway for subsequent formwork installation, rebar tying, and concrete pouring. However, existing construction trestle bridges and formwork systems still face many challenges in practical application that urgently need to be addressed: Traditional trestle bridges are mostly rigid structures that are integrally welded or bolted together. Their length is fixed and cannot flexibly adapt to the construction needs of different spans or cross sections. When the length of tunnel construction sections changes, existing trestle bridges are often too long or too short, resulting in the need for frequent dismantling, reassembly, or even customization of trestle bridges of different specifications on site. This not only significantly increases the complexity and time cost of construction, but also leads to problems such as poor equipment versatility and low resource utilization.

[0004] The mobility of existing trestle bridges is generally poor. Most trestle bridges are large and heavy, lacking efficient walking mechanisms. When it is necessary to move the work site, it usually relies on large lifting equipment (such as cranes) for hoisting and transportation, or on manual labor using tools such as pry bars for laborious and slow pushing. This method of movement is not only inconvenient to operate and poses safety risks, but also seriously disrupts the continuous construction process, becoming a bottleneck restricting the rapid construction of tunnels.

[0005] The coordination between the invert arch formwork and the trestle bridge is inefficient. The various components of the formwork (such as the curved template and connecting frames) rely heavily on manual positioning and securing on-site. This process is difficult to control precisely and is not synchronized with the movement of the trestle bridge, resulting in time-consuming and labor-intensive formwork installation, impacting the progress of the entire invert arch construction cycle. Furthermore, the stability of the connections between formwork components is often difficult to guarantee due to the uncertainties of manual operation.

[0006] Therefore, there is an urgent need in this field for an invert arch formwork solution that can overcome the above-mentioned defects. It should have flexible length adjustment capability, convenient mobility and precise positioning function, and be able to achieve efficient collaborative installation of the formwork and trestle, thereby comprehensively improving the mechanization level and operation efficiency of tunnel invert arch construction. Utility Model Content

[0007] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide an invert arch formwork for tunnel invert arch construction, solving the technical problems of existing trestle bridges having no adjustable length, inconvenient movement, and low efficiency in coordinated operation with the formwork.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A tunnel invert arch formwork for construction includes a tunnel body, a formwork body, a trestle mechanism, and a connecting mechanism. The trestle mechanism includes a connecting trestle, a second trestle, fixed columns, supporting blocks, mounting slots, an electric push rod, a fixing component, a connecting bridge, a support column, moving wheels, and lifting support legs. The second trestle is fixedly connected to one side of the connecting trestle. The fixed columns are equidistantly distributed inside the connecting trestle. The supporting blocks are symmetrically fixed to the bottom of the connecting trestle. The mounting slots are located on the supporting blocks. The electric push rod is installed on the outside of the supporting blocks, and its output end is connected to the connecting bridge through the fixing component. The connecting bridge is movably disposed within the mounting slot. The support column is fixed below the supporting block. The moving wheels are installed at the bottom of the support columns. The lifting support legs are symmetrically installed on the sides of the moving wheels. The connecting mechanism includes a fixed block, a connecting hook, a supporting frame, and a connecting seat. The fixed block is fixed to the bottom of the connecting trestle. The connecting hook is installed below the fixed block. The supporting frame is connected to the formwork body through the connecting seat and can be hooked by the connecting hook.

[0009] Furthermore, the tunnel body includes a construction tunnel body, a waterstop strip, and a wall waterstop device; the waterstop strip is located on the inner wall of the construction tunnel body; the wall waterstop device is located on the inner side of the waterstop strip.

[0010] Furthermore, the formwork body includes a formwork module, an arc-shaped inverted arch formwork, and a connecting frame; the formwork module is located inside the main body of the construction tunnel; the arc-shaped inverted arch formwork is equidistantly distributed within the formwork module; and the connecting frame is fixedly connected to the front end of the arc-shaped inverted arch formwork.

[0011] Furthermore, the electric push rod drives the connecting bridge to extend and retract, thereby adjusting the overall length of the trestle mechanism.

[0012] Furthermore, the movable wheels and lifting support legs work together to achieve the movement and positioning support of the trestle mechanism.

[0013] Furthermore, the first arc-shaped arch formwork and the second connecting frame are pre-connected structures.

[0014] Furthermore, the cooperation between the connecting hook and the connecting seat allows the trestle mechanism to drive the mold frame body to move synchronously when it moves.

[0015] As can be seen from the above technical solutions, compared with the prior art, the beneficial effects of this utility model are: 1. This utility model uses an electric push rod to drive the extension and retraction of the connecting bridge, which realizes flexible adjustment of the overall length of the trestle mechanism, can adapt to the needs of different tunnel cross sections and construction spans, and significantly improves the versatility and applicability of the equipment.

[0016] 2. This utility model achieves convenient movement and precise positioning of the trestle mechanism through the coordinated operation of the moving wheels and the lifting support legs, reducing reliance on external lifting equipment, lowering labor intensity and safety risks, and improving construction efficiency.

[0017] 3. This utility model achieves rapid connection and linkage between the trestle mechanism and the formwork body through the connecting mechanism, enabling the formwork to move synchronously with the trestle, thereby improving the accuracy and efficiency of formwork positioning; at the same time, the pre-connection structure of the formwork body reduces on-site installation procedures, further improving the overall construction speed and quality. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the mold frame body of this utility model; Figure 3 This utility model Figure 1 A magnified three-dimensional structural diagram at point A in the middle; Figure 4 This is a cross-sectional structural diagram of the connection mechanism of this utility model.

[0019] In the diagram: 1. Tunnel body; 101. Main body of the construction tunnel; 102. Waterstop strip one; 103. Waterstop device for the wall; 2. Formwork body; 201. Formwork module; 202. Arch-shaped invert formwork one; 203. Connecting frame two; 3. Trestle mechanism; 301. Connecting trestle; 302. Trestle two; 303. Fixed column; 304. Support block; 305. Installation groove; 306. Electric push rod; 307. Fixed component; 308. Connecting bridge; 309. Support column; 310. Moving wheel; 311. Lifting support leg; 4. Connecting mechanism; 401. Fixed block; 402. Connecting hook; 403. Support frame; 404. Connecting seat. Detailed Implementation

[0020] A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

[0021] like Figures 1 to 4 The invert arch formwork shown is mainly composed of four parts: the tunnel body 1, the formwork body 2, the trestle mechanism 3, and the connecting mechanism 4.

[0022] The formwork body 2 described in this preferred embodiment is the core component that forms the shape of the tunnel invert arch structure. For example... Figure 2As shown, it includes a formwork module 201, an arc-shaped inverted arch formwork 202, and a connecting frame 203. Multiple arc-shaped inverted arch formwork 202s are equidistantly distributed on the formwork module 201, collectively forming the inverted arch profile of the tunnel. A key improvement of this invention is that the arc-shaped inverted arch formwork 202 and its front-end connecting frame 203 are pre-connected and fixed in the factory or on-site, forming a unified "pre-connected structure." The beneficial effect of this design is that during on-site installation, there is no need to spend manpower and time aligning and tightening the two components, avoiding the instability problems that may occur due to manual on-site operation, and greatly improving the installation efficiency and initial stability of the formwork body.

[0023] The trestle mechanism 3 described in this preferred embodiment is key to achieving rapid movement and length adjustment. For example... Figure 1 and Figure 3 As shown, it is erected above the formwork body 2, providing a passage and working platform for construction. The trestle mechanism 3 is mainly composed of connecting trestle 301, with trestle 302 fixed to one side to extend its length. To enhance structural strength, fixed columns 303 are evenly distributed inside the connecting trestle 301.

[0024] In practical operation, the adjustable and movable function of the trestle mechanism 3 is achieved through the following structure: Length adjustment function: A receiving block 304 is symmetrically fixed at the bottom of the connecting trestle 301. The receiving block 304 has a mounting groove 305, and an electric push rod 306 is mounted on its outer side. The output end of the electric push rod 306 is connected to a connecting bridge 308 via a fixing component 307. This connecting bridge 308 is movably inserted into the mounting groove 305. The beneficial effect is that by controlling the extension and retraction of the electric push rod 306, the connecting bridge 308 can be driven to extend or retract from the mounting groove 305, thereby flexibly adjusting the overall length of the entire trestle mechanism 3. This allows it to perfectly adapt to tunnel construction sections of different spans, solving the problem of poor versatility of fixed-length trestle bridges.

[0025] Movement and positioning functions: Moving wheels 310 are installed below the receiving block 304 via support columns 309, and lifting support legs 311 are symmetrically installed on the sides of the moving wheels 310. The benefits are: when movement is needed, the lifting support legs 311 are raised, allowing the moving wheels 310 to contact the ground, and the entire trestle mechanism 3 can be easily moved to a new work position using machinery or manpower, replacing the inefficient and high-risk method of relying on cranes or manual prying; when fixed operation is required, the lifting support legs 311 are lowered, providing stable support to the ground, while simultaneously lifting the moving wheels 310 off the ground, thus ensuring the stability of the trestle in operation.

[0026] The connecting mechanism 4 described in this preferred embodiment is a "bridge" connecting the trestle mechanism 3 and the mold frame body 2, enabling their collaborative operation. For example... Figure 4 As shown, it includes a fixing block 401 fixed to the bottom of the connecting bridge 301, a connecting hook 402 installed below the fixing block 401, a receiving frame 403 fixed to the mold frame module 201, and a connecting seat 404 installed on the upper end of the receiving frame 403.

[0027] In practical use, when the trestle mechanism 3 moves above the formwork body 2, the connecting hook 402 accurately engages with the connecting seat 404 by controlling the micro-movement of the trestle. Subsequently, when the trestle mechanism 3 moves again, it can directly drive the formwork body 2 below to move together through the connecting mechanism 4. This design achieves linkage between the trestle and the formwork, integrating the formwork transfer process into the trestle's movement flow, eliminating the need to separately mobilize large equipment to transfer the formwork, and greatly improving the continuity and overall efficiency of construction.

[0028] The workflow of this utility model is as follows: First, the arched inverted arch formwork 202 and connecting frame 203 are pre-assembled into an integral formwork body 2 on the ground and hoisted into the initial position inside the tunnel. Next, the trestle mechanism 3 is moved above the formwork body 2 and connected to it via the connecting mechanism 4. Then, using the movement function of the trestle mechanism 3, the entire setup is easily and precisely towed to the designated construction area. Once in place, the lifting support legs 311 are operated to securely support the trestle mechanism 3, and the electric push rod 306 is activated to adjust the extension length of the connecting bridge 308 according to the specific length of the construction section, ensuring the trestle perfectly covers the work area. Finally, construction personnel can carry out subsequent formwork fine-tuning, concrete pouring, and other operations on the stable and appropriately long trestle. After completing this section of construction, the above movement steps are repeated for a quick transfer to the next construction section.

[0029] The above-described embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Any modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A formwork frame for tunnel invert construction, comprising a tunnel body (1), a formwork frame body (2), and a trestle mechanism (3), characterized in that, It also includes a connecting mechanism (4); The trestle mechanism (3) includes a connecting trestle (301), a second trestle (302), a fixed column (303), a receiving block (304), a mounting groove (305), an electric push rod (306), a fixed component (307), a connecting bridge (308), a support column (309), a moving wheel (310), and a lifting support leg (311). The second trestle (302) is fixedly connected to one side of the connecting trestle (301); the fixed posts (303) are equidistantly distributed inside the connecting trestle (301); the supporting blocks (304) are symmetrically fixed to the bottom of the connecting trestle (301); The mounting groove (305) is disposed on the receiving block (304); the electric push rod (306) is installed on the outside of the receiving block (304), and its output end is connected to the connecting bridge (308) through the fixing component (307); the connecting bridge (308) is movably disposed in the mounting groove (305); The support column (309) is fixed below the receiving block (304); the movable wheel (310) is installed at the bottom of the support column (309); the lifting support leg (311) is symmetrically installed on the side of the movable wheel (310); The connecting mechanism (4) includes a fixing block (401), a connecting hook (402), a receiving frame (403), and a connecting seat (404); the fixing block (401) is fixed to the bottom of the connecting bridge (301); the connecting hook (402) is installed below the fixing block (401); the receiving frame (403) is connected to the mold frame body (2) through the connecting seat (404) and can be hooked and connected by the connecting hook (402).

2. The invert arch formwork for tunnel invert arch construction according to claim 1, characterized in that, The tunnel body (1) includes a construction tunnel body (101), a waterstop (102), and a wall waterstop device (103); the waterstop (102) is located on the inner wall of the construction tunnel body (101); the wall waterstop device (103) is located on the inner side of the waterstop (102).

3. The invert arch formwork for tunnel invert arch construction according to claim 1, characterized in that, The formwork body (2) includes a formwork module (201), an arc-shaped inverted arch formwork (202), and a connecting frame (203); the formwork module (201) is located inside the main body (101) of the construction tunnel; the arc-shaped inverted arch formwork (202) is equidistantly distributed within the formwork module (201); and the connecting frame (203) is fixedly connected to the front end of the arc-shaped inverted arch formwork (202).

4. The invert arch formwork for tunnel invert arch construction according to claim 1, characterized in that, The electric push rod (306) drives the connecting bridge (308) to extend and retract to adjust the overall length of the trestle mechanism (3).

5. The invert arch formwork for tunnel invert arch construction according to claim 1, characterized in that, The movable wheel (310) and the lifting support leg (311) work together to realize the movement and positioning support of the trestle mechanism (3).

6. The invert formwork for tunnel invert construction according to claim 3, characterized in that, The first arc-shaped arch formwork (202) and the second connecting frame (203) are pre-connected structures.

7. The invert formwork for tunnel invert construction according to claim 1, characterized in that, The cooperation between the connecting hook (402) and the connecting seat (404) enables the trestle mechanism (3) to drive the mold frame body (2) to move synchronously when it moves.

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