Tunnel steel frame connecting plate bolt hole protection tool with sealing protection structure

Abstract

The utility model discloses a tunnel steel frame connecting plate bolt hole protection frock with sealed protection structure, including the connecting plate, the top of connecting plate is placed with the foam board, the outside of foam board is equipped with the U type fixed plate, and the both sides of connecting plate top are all penetrated and set up bolt hole no.

Description

Technical Field

[0001] This utility model relates to the field of tunnel initial support construction technology, specifically a tooling for protecting bolt holes of tunnel steel frame connecting plates with a sealed protection structure. Background Technology

[0002] In the initial support construction of railway subgrade tunnels, the steel frame, as a key load-bearing structure, directly affects the installation quality and overall support stability due to the precision of the bolt holes at its connecting plates. On-site, the bolt holes at the connecting plates are often exposed without specialized protection measures. To address pollutants such as dust, mud, concrete slurry, and construction wastewater in the construction environment, we have designed a bolt hole protection fixture for tunnel steel frame connecting plates with a sealed protective structure. Utility Model Content

[0003] The purpose of this utility model is to provide a bolt hole protection fixture for tunnel steel frame connecting plates with a sealed protection structure. It has the advantage of hiding and protecting the bolt holes at the connecting plate, and solves the problem that the bolt holes at the connecting plate are often exposed and no special protection measures are taken, resulting in the bolt holes being contaminated or blocked.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a bolt hole protection fixture for a tunnel steel frame connecting plate with a sealed protection structure, comprising a connecting plate, a foam board placed on top of the connecting plate, a U-shaped fixing plate sleeved on the outside of the foam board, bolt holes 1 penetrating through the front and rear sides of the top of the connecting plate, bolt holes 2 cooperating with bolt holes 1 penetrating through the front and rear sides of the top of the U-shaped fixing plate and the front and rear sides of the top of the foam board, and protective bolts provided on the front and rear sides of the bottom of the connecting plate, with the top of the protective bolts penetrating through bolt holes 1 and bolt holes 2 sequentially from bottom to top.

[0005] Preferably, a protective nut is threaded onto the top of the protective bolt, and elastic washers are fitted onto both the top and bottom of the protective bolt. The top of the bottom elastic washer contacts the bottom of the connecting plate, and the bottom of the top elastic washer contacts the top of the U-shaped fixing plate.

[0006] Preferably, a T-shaped mounting hole is provided through the center of the left side of the U-shaped fixing plate, and a moving groove is provided through the left and right sides of the bottom of the inner wall of the T-shaped mounting hole. A restraining component is installed inside the T-shaped mounting hole.

[0007] Preferably, the restraining component includes an internal hexagonal screw, which is installed inside the T-shaped mounting hole. The left and right sides of the external hexagonal screw are respectively movably connected to the left and right sides of the inner wall of the T-shaped mounting hole via bearings. The left and right sides of the external hexagonal screw are threaded with movable sleeves. The bottom of the two movable sleeves are connected to movable blocks on opposite sides. The bottom of the movable blocks passes through a movable groove and is connected to a restraining plate.

[0008] Preferably, the threads on the left and right sides of the external hexagonal screw rotate in opposite directions, the external part of the moving block slides in contact with the inner wall of the moving groove, and the external part of the moving sleeve slides in contact with the inner wall of the T-shaped mounting hole.

[0009] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model, through the combined use of a U-shaped fixing plate, protective bolts, foam board, and protective nut, has the advantage of concealing and protecting the bolt holes at the connecting plate. Based on the specific positions of the two bolt holes one on the connecting plate, bolt holes two are made at corresponding positions on the U-shaped fixing plate and the foam board. The foam board is placed on top of the connecting plate, and then the U-shaped fixing plate is clamped on the outside of the foam board. At this time, bolt holes one and two need to be on the same straight line. The protective bolt is used to penetrate bolt holes one and two from bottom to top, and finally the protective nut is screwed on to complete the protection of bolt holes one on the connecting plate. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the U-shaped fixing plate structure of this utility model; Figure 3 This is a sectional view of the U-shaped fixing plate structure of this utility model; Figure 4 This is a schematic diagram of the connecting plate structure of this utility model; Figure 5 This is a schematic diagram of the foam board structure of this utility model; Figure 6 This is a schematic diagram of the restraint component structure of this utility model.

[0011] In the diagram: 1. U-shaped fixing plate; 2. Protective bolt; 3. Connecting plate; 4. Foam board; 5. Restraining component; 51. Restraining plate; 52. Moving block; 53. Hex socket screw; 54. Moving sleeve; 6. Protective nut; 7. Bolt hole two; 8. Elastic washer; 9. Moving groove; 10. Bolt hole one; 11. T-shaped mounting hole. Detailed Implementation

[0012] Please see Figures 1-6A bolt hole protection fixture for a tunnel steel frame connecting plate with a sealed protection structure includes a connecting plate 3, a foam board 4 placed on top of the connecting plate 3, a U-shaped fixing plate 1 sleeved on the outside of the foam board 4, bolt holes 10 penetrating through the front and rear sides of the top of the connecting plate 3, bolt holes 7 merging with bolt holes 10 penetrating through the front and rear sides of the top of the U-shaped fixing plate 1 and the front and rear sides of the top of the foam board 4, and protective bolts 2 provided on the front and rear sides of the bottom of the connecting plate 3, with bolt holes 10 and bolt holes 7 penetrating through the top of the protective bolts 2 from bottom to top.

[0013] The protective bolt 2 is fitted with a protective nut 6 on its top thread. The protective bolt 2 is fitted with elastic washers 8 on both its top and bottom. The top of the bottom elastic washer 8 contacts the bottom of the connecting plate 3, and the bottom of the top elastic washer 8 contacts the top of the U-shaped fixing plate 1. The protective nut 6 facilitates the positioning of the protective bolt 2.

[0014] A T-shaped mounting hole 11 is provided through the center of the left side of the U-shaped fixing plate 1. Moving grooves 9 are provided through the bottom left and right sides of the inner wall of the T-shaped mounting hole 11. A restraining component 5 is installed inside the T-shaped mounting hole 11. The restraining component 5 can be easily installed through the T-shaped mounting hole 11.

[0015] The restraint component 5 includes an internal hexagon screw 53, which is installed inside the T-shaped mounting hole 11. The left and right sides of the external hexagon screw 53 are movably connected to the left and right sides of the inner wall of the T-shaped mounting hole 11 via bearings. The left and right sides of the external hexagon screw 53 are threaded with movable sleeves 54. The bottom of the two movable sleeves 54 is connected to a movable block 52 on the side where they are far apart. The bottom of the movable block 52 passes through the movable groove 9 and is connected to a restraint plate 51. The opposite side of the two restraint plates 51 is in contact with the foam board 4, and the top of the restraint plate 51 is in contact with the top of the inner wall of the U-shaped fixing plate 1.

[0016] The threads on the left and right sides of the internal hexagon screw 53 turn in opposite directions. The outer side of the moving block 52 slides in contact with the inner wall of the moving groove 9, and the outer side of the moving sleeve 54 slides in contact with the inner wall of the T-shaped mounting hole 11.

[0017] In use, based on the specific positions of the two bolt holes 10 on the connecting plate 3, bolt holes 7 are made at corresponding positions on the U-shaped fixing plate 1 and the foam board 4. The foam board 4 is placed on top of the connecting plate 3, and then the U-shaped fixing plate 1 is clamped onto the outside of the foam board 4. At this time, bolt holes 10 and 7 must be on the same straight line. The protective bolt 2 is used to pass through bolt holes 10 and 7 from bottom to top, and finally the protective nut 6 is screwed on to complete the protection of bolt holes 10 on the connecting plate 3. In order to maintain the stability of the foam board 4, the internal hex screw 53 can be rotated clockwise to make the two moving sleeves 54 move towards each other. Finally, the moving block 52 drives the restraining plate 51 to move, clamping the foam board 4.

[0018] The use of foam board 4 + U-shaped fixing plate 1 ensures a tight fit between the protective bolt 2 and bolt hole 10, achieving a "one-to-one" seal and effectively isolating dust, mud, slurry, and moisture, preventing blockage and corrosion of bolt hole 10 from the source. Foam board 4 is lightweight and flexible; during installation, it only requires manual fixing using the U-shaped fixing plate 1, followed by inserting the protective bolt 2 into bolt hole 10 from bottom to top, without additional tools. Disassembly is simple, requiring only a slight tightening of the protective bolt 2 without damaging the inner wall of bolt hole 10, significantly saving labor and time costs. Foam board 4 is low-cost, and the U-shaped fixing plate 1 is reusable, reducing material waste. Furthermore, foam board 4 is biodegradable, avoiding environmental pollution. Through these effective protections, bolt hole 10 is ensured to be clean, rust-free, and deformation-free before installation, eliminating the need for post-installation cleaning or repair, directly meeting bolt installation requirements, guaranteeing the fit and installation accuracy of the steel frame connecting plate, and improving the quality of tunnel support.

[0019] In summary, this bolt hole protection fixture for tunnel steel frame connecting plates with a sealed protection structure, through the combined use of U-shaped fixing plate 1, protective bolt 2, foam board 4, and protective nut 6, solves the problem that bolt holes at the connecting plate are often exposed and contaminated or blocked due to the lack of special protection measures.

Claims

1. A bolt hole protection fixture for a tunnel steel frame connecting plate with a sealed protection structure, comprising a connecting plate (3), characterized in that: A foam board (4) is placed on the top of the connecting plate (3). A U-shaped fixing plate (1) is fitted on the outside of the foam board (4). Bolt holes 1 (10) are opened through the front and rear sides of the top of the connecting plate (3). Bolt holes 2 (7) that cooperate with bolt holes 1 (10) are opened through the front and rear sides of the top of the U-shaped fixing plate (1) and the front and rear sides of the top of the foam board (4). Protective bolts (2) are provided on the front and rear sides of the bottom of the connecting plate (3). The top of the protective bolts (2) passes through bolt holes 1 (10) and bolt holes 2 (7) from bottom to top.

2. The bolt hole protection fixture for a tunnel steel frame connecting plate with a sealing protection structure according to claim 1, characterized in that: The protective bolt (2) is threaded with a protective nut (6) on its top. The protective bolt (2) is also threaded with elastic washers (8) on its top and bottom. The top of the bottom elastic washer (8) is in contact with the bottom of the connecting plate (3), and the bottom of the top elastic washer (8) is in contact with the top of the U-shaped fixing plate (1).

3. The bolt hole protection fixture for a tunnel steel frame connecting plate with a sealing protection structure according to claim 1, characterized in that: A T-shaped mounting hole (11) is provided through the center of the left side of the U-shaped fixing plate (1). Moving grooves (9) are provided through the bottom left and right sides of the inner wall of the T-shaped mounting hole (11). A restraining component (5) is installed inside the T-shaped mounting hole (11).

4. The bolt hole protection fixture for a tunnel steel frame connecting plate with a sealing protection structure according to claim 3, characterized in that: The restraint component (5) includes an internal hexagonal screw (53), which is installed inside the T-shaped mounting hole (11). The left and right sides of the external hexagonal screw (53) are connected to the left and right sides of the inner wall of the T-shaped mounting hole (11) respectively through bearings. The left and right sides of the external hexagonal screw (53) are threaded with movable sleeves (54). The bottom of the two movable sleeves (54) are connected to movable blocks (52) on the side that is far apart. The bottom of the movable blocks (52) passes through the movable groove (9) and is connected to a restraint plate (51).

5. The bolt hole protection fixture for a tunnel steel frame connecting plate with a sealing protection structure according to claim 4, characterized in that: The threads on the left and right sides of the internal hexagonal screw (53) are opposite in direction. The outside of the moving block (52) slides in contact with the inner wall of the moving groove (9), and the outside of the moving sleeve (54) slides in contact with the inner wall of the T-shaped mounting hole (11).

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