A device for positioning the thickness of a secondary lining protective layer

Abstract

This utility model relates to the field of tunnel lining technology. Addressing the problem of low accuracy in positioning the thickness of the secondary lining protective layer during existing secondary lining construction, it specifically discloses a secondary lining protective layer thickness positioning device. The device includes a secondary lining protective frame and several thickness positioning frames mounted on the protective frame. Each thickness positioning frame can pass through the secondary lining protective frame, and both ends of each frame can extend from either side of the frame. Each thickness positioning frame includes multiple parallel measuring rods and fixed caps and movable caps respectively located at both ends of the measuring rods. The measuring rods can pass through the movable caps, and the movable caps are movably engaged with the measuring rods. Through the adjustable and locking thickness positioning frames, the thickness at each intersection of reinforcing bars in the secondary lining protective layer can be precisely adjusted and fixed, thereby achieving accurate control over the thickness of the reinforcing bars in the secondary lining protective layer.

Description

Technical Field

[0001] This utility model relates to the field of tunnel lining technology, and more specifically, to a device for positioning the thickness of the secondary lining protective layer. Background Technology

[0002] In tunnel construction, secondary lining is a crucial step in ensuring the structural safety and long-term stable operation of the tunnel. After excavation, the initial support provides sufficient load-bearing capacity and stability to cope with the initial deformation and stress release of the surrounding rock. However, due to the limitations of the initial support itself and the continuous changes in surrounding rock stress, secondary lining is often necessary. Secondary lining typically employs cast-in-place concrete, constructed inside the initial support to form a permanent lining structure. Its function not only further enhances the load-bearing capacity of the tunnel structure and resists later deformation and ground stress of the surrounding rock, but also provides waterproofing, moisture protection, fireproofing, and aesthetic enhancement of the tunnel's interior environment. In various tunnel projects, including highway tunnels, railway tunnels, and water conservancy tunnels, the quality of secondary lining construction directly affects the tunnel's service life and operational safety.

[0003] In the secondary lining protective layer, the steel bars, as the main load-bearing components in the secondary lining structure, are easily affected by environmental factors such as groundwater, air, and corrosive substances, which can lead to corrosion. A secondary lining protective layer of appropriate thickness and uniformity can provide an effective protective barrier for the steel bars, prevent or slow down the contact between the steel bars and harmful external substances, reduce the risk of steel bar corrosion, and thus ensure the durability of the secondary lining structure and extend the service life of the tunnel. Based on this, patent CN211144515U provides a tunnel secondary lining rebar positioning device, which includes two sets of positioning mechanisms arranged at intervals. Each set of positioning mechanisms includes multiple threaded rods and two angle steels. One angle steel in each positioning mechanism is fixedly connected to one end of the multiple threaded rods, and the other angle steel in each positioning mechanism is fixedly connected to the other end of the multiple threaded rods. Each threaded rod has threads at both ends and a limiting steel plate located on one side of the middle position of the threaded rod. One right-angled side of the angle steel has a through hole and is fitted onto the threaded section of the threaded rod through the through hole. A nut is threadedly connected to the threaded rod to fix the angle steel in a position close to the limiting steel plate. The other right-angled side of the angle steel has a slot for engaging and connecting the secondary lining rebars. By accurately positioning the longitudinal spacing of the rebars and the spacing between rebar layers, the problem of correcting the secondary lining rebars again during the construction of the secondary lining can be avoided.

[0004] However, existing secondary lining reinforcement positioning equipment, such as those mentioned above, all suffer from low positioning accuracy. Due to the large scale of tunnel engineering, the small accuracy difference of a single reinforcement bar accumulates over a long distance with the accumulation of several reinforcement bars, resulting in a large deviation in the overall construction accuracy, that is, the accuracy of positioning the thickness of the secondary lining reinforcement bar is low. Utility Model Content

[0005] The purpose of this invention is to solve the problem of low accuracy in positioning the thickness of the secondary lining protective layer in existing secondary lining construction. This application provides a secondary lining protective layer thickness positioning device, which, through a movable, adjustable, and clamping thickness positioning frame, can precisely adjust and fix the thickness dimension at each intersection of reinforcing bars in the secondary lining protective layer, thereby achieving accurate control over the thickness of the reinforcing bars in the secondary lining protective layer.

[0006] This utility model is achieved through the following technical solution:

[0007] This utility model provides a secondary lining protective layer thickness positioning device, including a secondary lining protective frame and a plurality of thickness positioning frames mounted on the secondary lining protective frame. The thickness positioning frames can be inserted through the secondary lining protective frame, and both ends of the thickness positioning frames can extend out from both sides of the secondary lining protective frame. The thickness positioning frame includes a plurality of parallel rulers and fixed caps and movable caps respectively disposed at both ends of the rulers. The rulers can pass through the movable caps, and the movable caps can be movably engaged with the rulers.

[0008] Preferably, the secondary lining protective frame includes two parallel grid frames, each grid frame including several parallel spaced horizontal bars and several parallel spaced vertical bars, with the horizontal bars and vertical bars intersecting perpendicularly. The measuring rod can be erected at the perpendicular intersection of the horizontal bars and vertical bars in the two grid frames.

[0009] Preferably, the movable cap is provided with an assembly hole, and multiple ruler rods can be simultaneously passed through the assembly hole.

[0010] Preferably, the thickness positioning frame includes four ruler rods, and the cross-section of each ruler rod is a quarter circle arc. The cross-section of the four ruler rods combined is circular, and the four ruler rods can pass through the assembly hole simultaneously.

[0011] Preferably, a fixing nut is provided on the side of the movable cap away from the secondary lining protective frame, and the four ruler rods can pass through the fixing nut at the same time. The outer side wall of the ruler rod is provided with threads so that the fixing nut can be screwed into the four ruler rods.

[0012] Preferably, both the movable cap and the fixed cap near the grid frame have recessed snap-fit ​​grooves, and the concave surface of the snap-fit ​​grooves can fit against the outer wall surface of the grid frame.

[0013] Preferably, a limiting plate is provided at a position of the ruler rod near the grid frame, the limiting plate is sleeved on the outer wall of the ruler rod, and the limiting plate is slidably connected to the ruler rod.

[0014] Preferably, a scale is provided on the outer wall surface of the ruler.

[0015] The technical solution of this utility model has the following beneficial effects:

[0016] The present invention relates to a secondary lining protective layer thickness positioning device. The secondary lining protective layer consists of two sets of parallel steel reinforcement frames arranged in a crisscross pattern. A thickness positioning frame is installed at each intersection position. The thickness positioning frame passes between the two layers of grid frames. Through the movable, adjustable and clamping thickness positioning frame, the thickness dimension at each steel reinforcement intersection in the secondary lining protective layer can be precisely adjusted and fixed, thereby achieving accurate control of the steel reinforcement thickness of the secondary lining protective layer. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the secondary lining protective layer thickness positioning device in Example 1;

[0018] Figure 2 for Figure 1 A magnified structural diagram of part A in the diagram;

[0019] Figure 3 This is a schematic diagram of the thickness positioning frame in Example 1;

[0020] Figure 4 This is a schematic diagram of the structure of the movable cap in Example 1.

[0021] Reference numerals: 1-Grid frame, 11-Horizontal bar, 12-Vertical bar, 2-Thickness positioning frame, 21-Rule bar, 211-Scale, 22-Fixed cap, 23-Modible cap, 231-Assembly hole, 24-Fixed nut, 25-Snap-fit ​​groove, 26-Limiting plate. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below. Where specific conditions are not specified in the embodiments, they are performed under conventional conditions or conditions recommended by the manufacturer; where the manufacturers of instruments, equipment, reagents, or raw materials are not specified, they are all conventional products that can be purchased commercially.

[0023] The following is a detailed embodiment with reference to the accompanying drawings.

[0024] like Figures 1 to 3As shown, this utility model provides a secondary lining protective layer thickness positioning device, including a secondary lining protective frame and several thickness positioning frames 2 mounted on the secondary lining protective frame. The thickness positioning frames 2 can be inserted into the secondary lining protective frame, and both ends of the thickness positioning frames 2 can be inserted from both sides of the secondary lining protective frame. The secondary lining protective frame includes two parallel grid frames 1. The grid frames 1 include several parallel and spaced horizontal bars 11 and several parallel and spaced vertical bars 12. The horizontal bars 11 and vertical bars 12 are perpendicularly intersecting each other. A ruler 21 can be mounted at the perpendicular intersection of the horizontal bars 11 and vertical bars 12 in the two grid frames 1.

[0025] In this embodiment, the thickness positioning frame 2 includes four parallel ruler rods 21, and fixed caps 22 and movable caps 23 respectively disposed at both ends of the ruler rods 21. A scale 211 is provided on the outer wall surface of the ruler rods 21. The ruler rods 21 can pass through the movable caps 23, and the movable caps 23 can be movably engaged with the ruler rods 21. By adjusting the position of the movable caps 23 and determining the distance between the two layers of grid frame 1, i.e. the thickness, according to the scale 211 on the surface of the ruler rods 21, the thickness of each intersection of the reinforcing bars in the secondary lining protective layer can be obtained and adjusted accordingly and fixed, thereby achieving accurate control of the thickness of the reinforcing bars in the secondary lining protective layer.

[0026] In this embodiment, the thickness positioning frame 2 includes four ruler rods 21, and the cross-section of each ruler rod 21 is a quarter-circle arc, and the cross-section of the four ruler rods 21 combined is circular; the movable cap 23 is provided with an assembly hole 231, and the four ruler rods 21 can be set through the assembly hole 231 at the same time; a fixing nut 24 is also provided on the side of the movable cap 23 away from the secondary lining protective frame, and the four ruler rods 21 can be passed through the fixing nut 24 at the same time, and the outer wall of the ruler rod 21 is provided with threads, so that the fixing nut 24 can be screwed into the four ruler rods 21; the movable cap 23 near the grid frame 1 and the fixing cap 22 near the grid frame 1 are both provided with a snap-fit ​​groove 25, and the concave surface of the snap-fit ​​groove 25 can fit against the outer wall surface of the grid frame 1.

[0027] In this embodiment, a limiting plate 26 is provided near the grid frame 1 on the ruler 21. The limiting plate 26 is sleeved on the outer wall of the ruler 21 and is slidably connected to the ruler 21. The limiting plate 26 can fix the grid frame 1 and prevent the grid frame 1 from tilting in the direction of mutual approach.

[0028] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A device for positioning the thickness of a secondary lining protective layer, characterized in that, It includes a secondary lining protective frame and several thickness positioning frames (2) mounted on the secondary lining protective frame. The thickness positioning frames (2) can be inserted through the secondary lining protective frame, and both ends of the thickness positioning frames (2) can be inserted through both sides of the secondary lining protective frame. The thickness positioning frame (2) includes multiple parallel ruler rods (21), and fixed caps (22) and movable caps (23) respectively disposed at both ends of the ruler rods (21). The ruler rods (21) can pass through the movable caps (23), and the movable caps (23) can be movably engaged with the ruler rods (21).

2. The secondary lining protective layer thickness positioning device according to claim 1, characterized in that, The secondary lining protective frame includes two parallel grid frames (1). The grid frame (1) includes several parallel horizontal bars (11) and several parallel vertical bars (12). The horizontal bars (11) and the vertical bars (12) are perpendicularly intersecting each other. The ruler (21) can be erected at the perpendicular intersection of the horizontal bars (11) and the vertical bars (12) in the two grid frames (1).

3. The secondary lining protective layer thickness positioning device according to claim 2, characterized in that, The movable cap (23) is provided with an assembly hole (231), and multiple ruler rods (21) can be simultaneously installed by passing through the assembly hole (231).

4. The secondary lining protective layer thickness positioning device according to claim 3, characterized in that, The thickness positioning frame (2) includes four ruler rods (21), and the cross-section of each ruler rod (21) is a quarter circle arc. The cross-section of the four ruler rods (21) combined is circular. The four ruler rods (21) can pass through the assembly hole (231) at the same time.

5. The secondary lining protective layer thickness positioning device according to claim 4, characterized in that, The movable cap (23) is also equipped with a fixing nut (24) on the side away from the secondary lining protective frame. The four ruler rods (21) can pass through the fixing nut (24) at the same time, and the outer side wall of the ruler rod (21) is provided with threads so that the fixing nut (24) can be screwed into the four ruler rods (21).

6. The secondary lining protective layer thickness positioning device according to claim 2, characterized in that, The movable cap (23) near the grid frame (1) and the fixed cap (22) near the grid frame (1) are both provided with a snap-fit ​​groove (25), and the concave surface of the snap-fit ​​groove (25) can fit against the outer wall surface of the grid frame (1).

7. The secondary lining protective layer thickness positioning device according to claim 2, characterized in that, A limiting plate (26) is provided at the position of the ruler rod (21) near the grid frame (1). The limiting plate (26) is sleeved on the outer wall of the ruler rod (21) and is slidably connected to the ruler rod (21).

8. The secondary lining protective layer thickness positioning device according to claim 1, characterized in that, A scale (211) is provided on the outer wall of the ruler (21).

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