Tunnel arch frame connection auxiliary device

Abstract

The utility model discloses a tunnel arch frame connection auxiliary device, and relates to the technical field of tunnel construction. The tunnel arch frame comprises a plurality of steel arch frames, and every two adjacent steel arch frames are connected through a U-shaped longitudinal connecting steel bar. The connecting auxiliary device comprises a steel sleeve used for installing a U-shaped longitudinal connecting steel bar, a C-shaped component installed on the steel arch and a T-shaped connecting piece. The T-shaped connecting piece is movably arranged in the C-shaped component in a sleeved mode and connected with the steel sleeve. Through the arrangement of the C-shaped components and the T-shaped connecting pieces, positioning of the steel sleeves can be adjusted conveniently, the steel sleeves can be installed on the steel arches when construction errors exist in the positions of the steel sleeves on the adjacent steel arches, the connection mode during site construction in the tunnel is mechanical connection, potential risks caused by welding in the gas tunnel are avoided, and the construction efficiency is improved. Safety construction of workers is guaranteed, the problem that overhead welding is difficult to construct is solved, and construction quality and efficiency are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel construction, in particular to a tunnel arch connection auxiliary device. Background Art

[0002] During tunnel construction, arches require longitudinal connections to ensure the overall mechanical performance of the structural system. This is typically achieved by connecting the sides of adjacent steel arches with longitudinal connecting steel bars. As the number and scale of tunnel projects in my country continue to expand, an increasing number of tunnels are traversing areas rich in gas. Hot-hot welding can easily cause explosions in gas tunnels, leading to mass casualties and injuries, and poses a significant risk to workers due to oxygen deprivation in the tunnel after gas combustion. Therefore, longitudinal connections between steel arches in gas tunnels should generally be made mechanically, rather than welding, as much as possible.

[0003] The CDWZQ-15 section of the pre-station project for the new Chengdu-Dazhou-Wanzhou Railway (Yingshan West to Wanzhou North Section) was designed to pre-weld a steel sleeve on the side of the steel arch outside the tunnel. The straight section of the U-shaped longitudinal connecting steel bar was then inserted into the sleeve inside the tunnel. Pin holes were then created in the straight section of the U-shaped longitudinal limiting bar, and cotter pins were inserted into the pin holes to prevent the U-shaped longitudinal connecting steel bar from shifting. However, this design presented the following two issues:

[0004] 1. It is difficult to insert the U-shaped longitudinal connecting steel bars precisely into the steel casing. Due to the influence of construction conditions and surrounding rock conditions, the actual arch spacing during construction often deviates from the design. The positions of the corresponding steel casings between adjacent arches are also unlikely to be completely consistent, making it difficult to precisely insert the U-shaped longitudinal connecting steel bars into the steel casing.

[0005] 2. Low construction efficiency. It is difficult to open pin holes on U-shaped steel bars, and the construction time is long, which affects the construction efficiency. Utility Model Content

[0006] The utility model provides a tunnel arch connection auxiliary device, which aims to solve the problems of existing design solutions in which U-shaped longitudinal connecting steel bars are difficult to insert into steel casings and the construction efficiency is low, and to achieve safe and efficient construction while meeting the force requirements.

[0007] In order to achieve the above-mentioned purpose, the technical ideas adopted by the present invention to solve the technical problems are as follows:

[0008] A tunnel arch connection auxiliary device is designed. By connecting a C-shaped member to the steel arch, a connecting mechanism is movably set inside the C-shaped member, and the connecting mechanism is connected to the steel casing to adjust the position of the steel casing, thereby ensuring that the U-shaped longitudinal connecting steel bar is exactly inserted into the steel casing; a nut is threadedly connected to each end of the U-shaped longitudinal connecting steel bar to fix the U-shaped longitudinal connecting steel bar.

[0009] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention to solve the technical problem is:

[0010] A tunnel arch connection auxiliary device, the tunnel arch comprising a plurality of steel arches, adjacent two steel arches being connected by U-shaped longitudinal connecting steel bars; the connection auxiliary device comprising a steel casing for mounting the U-shaped longitudinal connecting steel bars;

[0011] It also includes a C-shaped member installed on the steel arch frame, and a connecting mechanism is movably provided on the C-shaped member;

[0012] The connecting mechanism is used to adjust the position of the steel casing and install the steel casing.

[0013] Furthermore, the connecting mechanism includes a T-shaped connecting piece and a limiting plate;

[0014] The T-shaped connector is movably mounted in the C-shaped component and connected to the steel casing;

[0015] The top of the T-shaped connector is connected to the limiting plate, and the bottom of the limiting plate is located above the top of the C-shaped component.

[0016] Furthermore, a plurality of third bolts are provided between the side surface of the C-shaped member and the T-shaped connector;

[0017] The third bolt passes through the C-shaped member.

[0018] Furthermore, a first nut is threadedly connected to the end of the U-shaped longitudinal connecting steel bar.

[0019] The beneficial effects of the present invention are as follows: compared with the prior art, the improvement of the present invention is that:

[0020] 1. The utility model provides a C-shaped component and a connecting mechanism, which not only facilitates the adjustment of the position of the steel casing and allows the installation of U-shaped longitudinal connecting steel bars on the steel arch when there is a construction error in the position of the corresponding steel casing on adjacent steel arches, but also the connection method during on-site construction in the tunnel is mechanical connection, avoiding the potential dangers caused by welding in the gas tunnel, ensuring the safety of workers in construction, and avoiding the problem of difficult overhead welding construction, thereby improving construction quality.

[0021] 2. The utility model utilizes the size difference between the T-type connector and the C-type component to realize the position adjustment of the T-type connector, so that the steel casing can be adjusted along the span direction and longitudinal direction of the steel arch frame, ensuring that within a certain construction error range, the U-shaped longitudinal connecting steel bar can still be smoothly inserted into the steel casing, thereby improving construction efficiency.

[0022] 3. The connection mechanism of the present invention connects a limit plate at the top of the T-shaped connector and connects a second bolt assembly at the bottom of the limit plate, so that the position of the T-shaped connector along the height direction of the steel arch frame can be adjusted, further ensuring the smooth connection of the U-shaped longitudinal connecting steel bars and improving construction efficiency.

[0023] 4. The utility model connects the first nut at the end of the U-shaped longitudinal connecting steel bar, thereby facilitating the rapid fixation of the U-shaped longitudinal connecting steel bar in the steel casing, thereby helping to improve construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for use in the embodiments.

[0025] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0026] Figure 2 yes Figure 1 A partial enlarged view of part A;

[0027] Figure 3 yes Figure 2 Exploded diagram;

[0028] Figure 4 It is a plan view of the connection method between the T-type connector and the C-type component;

[0029] Figure 5 yes Figure 1 BB stereoscopic cross-sectional view;

[0030] Figure 6 yes Figure 5 A partial enlarged view of part C in the middle;

[0031] In the picture:

[0032] 1. Steel arch frame; 11. Web plate;

[0033] 2. U-shaped longitudinal connecting steel bar; 21. First nut; 22. External thread;

[0034] 3. Connecting mechanism; 31. T-type connector; 32. Limiting plate; 33. Second bolt assembly;

[0035] 4. Steel casing;

[0036] 5. C-shaped member; 51. Third bolt; 52. Enlarged head; 53. Threaded hole. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments, rather than all the embodiments. Example 1

[0038] refer to Figure 1-6 , taking the longitudinal connection between H-shaped steel arch frames as an example, the present invention is described. The present invention provides a tunnel arch frame connection auxiliary device, the tunnel arch frame includes a plurality of steel arch frames 1, and two adjacent steel arch frames 1 are connected by U-shaped longitudinal connecting steel bars 2; the connection auxiliary device includes a steel sleeve 4 and a C-shaped member 5, the steel sleeve 4 is used to install the U-shaped longitudinal connecting steel bars 2; the C-shaped member 5 is installed on the web 11 of the steel arch frame 1; the C-shaped member 5 is movably provided with a connecting mechanism 3, the connecting mechanism 3 is used to adjust the position of the steel sleeve 4 and install the steel sleeve 4. Specifically, the straight sections at both ends of the U-shaped longitudinal connecting steel bars 2 are respectively sleeved in the steel sleeves 4 on both sides, and the C-shaped member 5 is welded to the middle part of the web 11 of the steel arch frame 1 along the height direction outside the tunnel.

[0039] The connecting mechanism 3 includes a T-shaped connector 31 and a limiting plate 32; the T-shaped connector 31 is movably mounted in the C-shaped member 5 and connected to the steel casing 4; the top of the T-shaped connector 31 is connected to the limiting plate 32, and the bottom of the limiting plate 32 is located above the top of the C-shaped member 5. Specifically, the steel casing 4 is welded to the T-shaped connector 31 outside the tunnel; the dimensions of the T-shaped connector 31 along the span direction and the longitudinal direction of the span of the steel arch 11 are smaller than those of the C-shaped member 5, so that when there is a construction error in the position of the steel casing 4 on the adjacent steel arch 1, the position of the steel casing 4 can be adjusted along the span direction and longitudinal direction of the steel arch 1, facilitating the insertion of the U-shaped longitudinal connecting steel bar 2 into the corresponding steel casing 4; the dimensions of the limiting plate 32 along the span direction of the steel arch 1 are larger than those of the C-shaped member 5, and the limiting plate 32 can be clamped above the C-shaped member. Preferably, the limiting plate 32 and the T-shaped connector 31 are integrally formed.

[0040] The C-shaped member 5 also has multiple threaded holes 53. After the third bolt 51 passes through the threaded holes 53, it abuts against the T-shaped connector 31, using friction to secure the T-shaped connector 31 within the C-shaped member 5. To further increase friction, the front end of the third bolt 51 is fitted with an enlarged head 52. After the T-shaped connector 31 is flexibly inserted into the C-shaped member 5, it is dragged along the span direction and longitudinal direction of the steel arch 1 to fine-tune its position. Once the adjustment is complete, the T-shaped connector 31 is released at the appropriate position, and the stop plate 32 is used to limit the position. The third bolt 51 is then tightened to further ensure the reliability of the limit.

[0041] In order to prevent the U-shaped longitudinal connecting steel bar 2 from falling out of the steel casing 4 and ensure the reliability of the connection, an external thread 22 is provided at the end of the straight section of the U-shaped longitudinal connecting steel bar 2. The external thread 22 is externally threadedly connected to the first nut 21. The outer diameter of the first nut 21 threadedly engaged with the external thread 22 is greater than the inner diameter of the steel casing 4. Example 2

[0042] On the basis of Example 1, in order to facilitate the adjustment of the position of the steel casing 4 along the height direction of the tunnel and ensure that the U-shaped longitudinal connecting steel bar 2 can still be inserted into the corresponding steel casing 4 under a certain construction error, Example 2 provides an optimal solution for a limit plate 32.

[0043] refer to Figure 2-6 The bottom of the limit plate 32 is connected to a second bolt assembly 33, which is located above the top of the C-shaped member 5. Specifically, the bolt head of the second bolt assembly 33 is connected to the bottom of the limit plate 32. By rotating the nut on the second bolt assembly 33, the distance between the bottom of the limit plate 32 and the top of the C-shaped member 5 can be adjusted. The bottom of the second bolt assembly 33 is brought into contact with the top of the C-shaped member 5, thereby adjusting the position of the steel casing 4 along the tunnel height direction.

[0044] The design of Example 2 allows for fine-tuning of the steel casing 4 relative to the steel arch 1 in three dimensions: height, width, and longitudinal direction. This ensures that, within certain construction tolerances, the U-shaped longitudinal reinforcement can still be reliably connected between the two steel arches 1. Furthermore, the present invention only requires pre-welding of the C-shaped member 5 to the web of the steel arch 1 outside the tunnel; on-site construction within the tunnel utilizes mechanical connections. This not only avoids the dangers of welding within a gas tunnel, ensuring worker safety, but also eliminates the difficulty of overhead welding at elevated locations, thereby improving construction quality.

[0045] Taking the example of construction workers completing the connection of two adjacent H-shaped steel arch frames, the use method of the tunnel arch frame connection auxiliary device of the present invention is specifically described.

[0046] The first step is to pre-weld the C-shaped member 5 to the web 11 of the steel arch 1 outside the tunnel.

[0047] Step 2: In the tunnel, first, sleeve the T-shaped connectors 31 into the corresponding C-shaped components 5, then sleeve one end of the U-shaped longitudinal connecting steel bar 2 into the steel casing 4 on one side of the steel arch frame 1, and then move the position of the T-shaped connector 31 on the other side of the steel arch frame 1 along the span and longitudinal direction of the steel arch frame 1; if necessary, rotate the nut of the second bolt assembly 33 to adjust the position of the T-shaped connector 31 along the height direction of the arch frame. After the position is properly adjusted, sleeve the other end of the U-shaped longitudinal connecting steel bar 2 into the corresponding steel casing 4.

[0048] Step 3: Tighten the third bolts 51 on both sides to firmly connect the T-shaped connector 31 and the C-shaped component 5; then tighten the first nut 21 to firmly connect the U-shaped longitudinal connecting steel bar 2 and the steel casing 4.

[0049] It should be understood that the detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

Claims

1. A tunnel arch connection auxiliary device, the tunnel arch comprising a plurality of steel arches (1), wherein two adjacent steel arches (1) are connected via U-shaped longitudinal connecting steel bars (2); the connection auxiliary device comprising a steel casing (4) for mounting the U-shaped longitudinal connecting steel bars (2); Its characteristics are: It also includes a C-shaped member (5) mounted on the steel arch frame (1), wherein a connecting mechanism (3) is movably provided on the C-shaped member (5); The connecting mechanism (3) is used to adjust the position of the steel casing (4) and to install the steel casing (4).

2. The tunnel arch connection auxiliary device according to claim 1, characterized in that: The connecting mechanism (3) comprises a T-shaped connecting piece (31) and a limiting plate (32); The T-shaped connector (31) is movably sleeved in the C-shaped component (5) and connected to the steel sleeve (4); The top of the T-shaped connector (31) is connected to the limiting plate (32), and the bottom of the limiting plate (32) is located above the top of the C-shaped component (5).

3. The tunnel arch connection auxiliary device according to claim 2, characterized in that: The bottom of the limiting plate (32) is connected to a second bolt assembly (33), and the second bolt assembly (33) is located above the top of the C-shaped component (5).

4. The tunnel arch connection auxiliary device according to claim 2, characterized in that: A plurality of third bolts (51) are provided between the side surface of the C-shaped member (5) and the T-shaped connecting member (31); The third bolt (51) passes through the C-shaped member (5).

5. The tunnel arch connection auxiliary device according to claim 1, characterized in that: A first nut (21) is threadedly connected to the end of the U-shaped longitudinal connecting steel bar (2).

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