An assembled cement fiber pressure plate for tunnel protection

Abstract

This invention discloses a prefabricated cement fiber pressure board for tunnel protection, relating to the field of building panel technology. It comprises multiple panels, each with a fixing block bolted to a groove at one of its four corners. A rotating frame is bolted to the outer side of each fixing block, and the rotating frame is rotatably connected to a slide frame via a torsion spring in a bottom hole. The slide frame is slidably connected to an installation frame via symmetrical protrusions on its front and rear sides. A buffer pad is installed in a groove on the side of the installation frame facing the slide frame. This invention achieves rapid prefabricated installation of the panels using keel strips. The flatness of the curved panels can be precisely adjusted using adjusting screw one, fixing blocks, rotating frames, and slide frames. Mechanical locking and connection of adjacent panels is achieved using adjusting screw two, adjusting blocks, sliding plates, plugs, and connectors, effectively improving panel installation efficiency, splicing accuracy, and overall structural robustness.

Description

Technical Field

[0001] This invention relates to the field of building materials technology, specifically to a prefabricated cement fiber pressure board for tunnel protection. Background Technology

[0002] Tunnels are core infrastructure for road transportation. High-speed vehicles generate a piston effect, creating a continuous and reciprocating airflow impact on the inner wall of the tunnel's arched lining, which can easily cause wear, spalling, cracking, and other defects in the lining wall. To protect the lining substrate and improve the protective performance and traffic safety of the tunnel inner wall, the industry commonly uses cement fiber pressure boards for protective paving of the tunnel lining inner wall. This board, with its advantages of high strength, corrosion resistance, and excellent protection, is widely used in tunnel protective lining projects.

[0003] However, tunnel cement fiber pressure boards lack standardized prefabricated structures, relying heavily on on-site manual assembly and alignment. This cumbersome installation process results in low construction efficiency and fails to meet the rapid paving requirements of tunnel arched surfaces. Furthermore, traditional boards lack fine-tuning mechanisms, leading to misalignment and unevenness during installation on curved surfaces. This results in poor splicing accuracy and molding quality, negatively impacting subsequent spraying and decorative finishes. Additionally, traditional boards are mostly fixed using simple methods like bolts, which can lead to insufficient locking and limiting capabilities, poor connection strength between adjacent boards, and easy loosening and disengagement over time. Moreover, existing cement fiber pressure board fixing structures often lack buffer components, making them vulnerable to the impact of reciprocating airflow within the tunnel. The long-term effect of the gas piston effect further exacerbates wear, loosening, and even breakage at connection points, significantly shortening the board's lifespan and increasing maintenance costs for tunnel repair and replacement. Summary of the Invention

[0004] This invention overcomes the shortcomings of the prior art and proposes a prefabricated cement fiber pressure board for tunnel protection.

[0005] This invention is achieved through the following technical solution: A prefabricated cement fiber pressure board for tunnel protection includes multiple boards arranged sequentially along the inner wall of the tunnel lining. Multiple keel strips are fixed to the tunnel lining wall, equidistantly distributed along the arched lining wall. Each board is connected to a corresponding keel strip via a connecting assembly, and the curvature of the board matches the curvature of the corresponding arched lining wall. The connecting assembly includes a fixing block, a rotating frame, a sliding frame, and a mounting frame. Each board has a groove at its four corners, and a fixing block is bolted to each groove. A rotating frame is bolted to the outer side of each fixing block, and the rotating frame is rotatably connected to the sliding frame via a torsion spring. The sliding frame has symmetrical protrusions on its front and rear sides, which limit its sliding connection to the mounting frame. A downward protruding end is located on the side of the mounting frame away from the sliding frame, and this downward protruding end slides against the corresponding keel strip. A reinforcing assembly is placed between the keel strip and the mounting frame, securing the keel strip and mounting frame together.

[0006] Furthermore, a cushioning pad is installed in the groove on the side of the mounting bracket facing the slide, and the cushioning pad is in contact with the slide.

[0007] Furthermore, the mounting brackets at the front and rear horizontal positions of each panel are slidably connected to the same keel strip.

[0008] Furthermore, an adjusting screw is threaded into the circular slot above the fixing block, and a top plate is connected to the end of the adjusting screw facing the slide. The top plate is fixed at the notch position above the slide.

[0009] Furthermore, the end of the adjusting screw that contacts the top plate is designed as a hemispherical curved surface structure, and the hemispherical curved surface of the adjusting screw is used to slide against the top plate.

[0010] Furthermore, the reinforcement component includes a connecting piece, which is fixed to the upper wall of the groove on one side of the mounting bracket. An adjusting screw is threaded into the circular hole of the connecting piece. An adjusting block is fixed to the outer side of the adjusting screw through the connecting piece. Sliding pieces are abutted to the upper and lower outer sides of the adjusting block. A connector is fixed to the top of the upper sliding piece, and a plug is fixed to the bottom of the lower sliding piece.

[0011] Furthermore, the sliders are vertically limited and slidably installed in the vertical strip openings on both sides of the mounting bracket through notches at symmetrical positions on both sides, and the two sliders are connected by two springs.

[0012] Furthermore, the top of the connector is designed with a sloping groove structure, and the bottom of the plug has a shape structure that corresponds to the sloping groove structure of the connector.

[0013] Furthermore, the outer side of the adjusting block is designed with a tapered inclined surface structure, which is used to adjust the position of the slider.

[0014] Furthermore, in the initial state, the gap length between the adjusting block and the groove surface on one side of the keel strip corresponds to the length of the tapered inclined surface of the adjusting block.

[0015] The beneficial effects of this invention compared to the prior art are as follows: 1. This invention simplifies the installation process significantly by using standardized interlocking of keel strips and modular assembly of components, enabling rapid paving of the panels. Simultaneously, relying on a fine-tuning structure composed of fixed blocks, rotating frames, and sliding frames, along with adjusting screw one, it precisely corrects installation deviations of the curved panels, levels the curved surfaces of adjacent panels, and ensures the flatness of the tunnel lining panel surface, providing a good foundation for subsequent decoration and coating construction. Furthermore, the mechanical locking and connecting structure composed of adjusting screw two, adjusting blocks, sliding pieces, plugs, and connectors effectively reinforces the connection positions of adjacent panels, significantly improving the splicing firmness and forming stability of the overall lining structure.

[0016] 2. The plate described in this invention has excellent buffering and protective performance, and is suitable for the complex working conditions after the tunnel is opened to traffic. In response to the gas piston effect generated by high-speed vehicle traffic, the plate can adapt to the force displacement through the sliding buffer structure composed of fixed blocks at the four corners, rotating frame, slide frame and mounting frame. The squeeze buffer pad offsets the reciprocating force brought by the airflow impact, effectively avoiding the wear, loosening and damage of the connection parts caused by repeated deformation of the plate, greatly reducing the equipment operating loss, extending the overall service life of the tunnel lining plate, and continuously ensuring the long-term safety and integrity of the tunnel arch lining structure. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the arched installation distribution structure of the plate body and keel strips of the present invention; Figure 2 This is a schematic diagram of the disassembled structure of the plate and fixing block of the present invention; Figure 3 for Figure 2 Enlarged structural diagram at point A in the middle; Figure 4 This is a cross-sectional view of the fixing block, a schematic diagram of the disassembled structure of the mounting frame and the keel strip of the present invention; Figure 5 This is a cross-sectional view of the fixing block, a schematic diagram of the disassembled structure of the rotating frame, the sliding frame, and the mounting frame of the present invention; Figure 6 This is a cross-sectional view of the mounting bracket of the present invention, and a schematic diagram of the structure of the adjusting screw, adjusting block and sliding plate. Figure 7 This is a schematic diagram showing the disassembled structure of the reinforcing component, buffer pad, and mounting bracket of the present invention; Figure 8 This is a schematic diagram of the installation and distribution structure inside the plate tunnel of the present invention.

[0018] In the diagram: 1. Plate; 2. Fixing block; 3. Rotating frame; 4. Slide; 5. Buffer pad; 6. Mounting frame; 7. Adjusting screw one; 8. Top plate; 9. Reinforcing component; 91. Connecting plate; 92. Adjusting screw two; 93. Adjusting block; 94. Slide plate; 95. Plug; 96. Connector; 10. Keel strip. Detailed Implementation

[0019] To make the technical problems to be solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solutions of this invention are described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto. Example 1

[0020] Please see Figures 1 to 8 The present invention provides a technical solution: a prefabricated cement fiber pressure board for tunnel protection, comprising multiple plates 1, which are arranged sequentially and set along the inner wall of the tunnel lining; multiple keel strips 10 are horizontally fixed on the tunnel lining wall by anchor bolts, which are equidistantly distributed along the arched lining wall of the tunnel; the plates 1 are connected to the corresponding keel strips 10 by connecting components, and the curvature of the plates 1 is consistent with the curvature of the arched lining wall at the corresponding position.

[0021] The connecting assembly includes a fixing block 2, a rotating frame 3, a slide 4, and a mounting frame 6. Each plate 1 has a groove at one of its four corners, and the fixing block 2 is bolted to each groove. The rotating frame 3 is bolted to the outer side of the fixing block 2. The rotating frame 3 is rotatably connected to the slide 4 through a torsion spring in its bottom hole. The slide 4 can rotate toward the column below the rotating frame 3. The front and rear sides of the slide 4 have symmetrical protrusions. The slide 4 is slidably connected to the mounting frame 6 through the protrusions. The slide 4 also has a groove. A buffer pad 5 is installed in the groove on the side of the mounting frame 6 facing the slide 4. The buffer pad 5 is in contact with the slide 4 and is used to buffer the force on the slide 4.

[0022] When the tunnel is opened to traffic, the gas piston effect generated by the high-speed vehicles passing through will cause the installed plate 1 to be subjected to force. Each plate 1 will move by the corresponding rotating frame 3 and sliding frame 4 through the fixing blocks 2 at the four corners, which will squeeze the buffer pad 5 in the mounting frame 6. This will buffer the force and reduce the damage to the fixed connection position caused by the reciprocating deformation of the plate 1 due to the gas piston effect, thereby improving the service life of the plate 1.

[0023] An adjusting screw 7 is threaded into the circular slot above the fixing block 2. The end of the adjusting screw 7 facing the slide 4 is connected to a top plate 8. The end of the adjusting screw 7 that abuts against the top plate 8 is designed with a hemispherical curved surface structure. The hemispherical curved surface abutting end of the adjusting screw 7 is used to slide against the top plate 8. The top plate 8 is fixed at the notch position above the slide 4. The mounting bracket 6 has a downward protruding end on the side away from the slide 4. The mounting bracket 6 is slidably connected to the corresponding keel strip 10 through the downward protruding end. The mounting bracket 6 at the front and rear horizontal positions of each plate 1 is slidably connected to the same keel strip 10. A reinforcing component 9 is provided between the keel strip 10 and the mounting bracket 6. The keel strip 10 and the mounting bracket 6 are fixed by the reinforcing component 9.

[0024] After placing the curved plate 1 on the corresponding two keel strips 10, when there is a deviation between two adjacent plates 1, the installer uses a wrench to turn the adjusting screw 7, causing the adjusting screw 7 to rotate in the thread of the fixing block 2 and move towards the rotating frame 3. At this time, because the adjusting screw 7 is slidably connected to the top plate 8, the adjusting screw 7 drives the rotating frame 3 on the fixing block 2 to rotate in the direction of the fixing block 2, thereby finely adjusting the position of the two adjacent curved plates 1, so that the inner curved surfaces of the two adjacent curved plates 1 are adjusted to a relatively flat position, which facilitates the subsequent construction of decorative panels or paint. Example 2

[0025] Based on Example 1, please refer to Figures 1 to 8 The present invention provides a technical solution: a reinforcing component 9 is disposed between the keel strip 10 and the mounting bracket 6. The reinforcing component 9 includes a connecting piece 91, which is fixed to the upper wall of a groove on one side of the mounting bracket 6. An adjusting screw 92 is threaded into the circular hole of the connecting piece 91. An adjusting block 93 is fixed to the outer side of the adjusting screw 92, which passes through the connecting piece 91. Sliding pieces 94 are abutted and connected to the upper and lower outer sides of the adjusting block 93. The outer side of the adjusting block 93 is designed with a conical inclined surface structure, which is used to adjust the position of the sliding piece 94. The sliding piece 94 is symmetrically positioned on both sides. The notch is vertically limited and slidably installed in the vertical strip openings on both sides of the mounting bracket 6. The two sliding pieces 94 are connected by two springs. The top of the upper sliding piece 94 is fixed with a connector 96, and the bottom of the lower sliding piece 94 is fixed with a plug 95. The upper part of the connector 96 is designed with a sloping groove structure, and the lower part of the plug 95 corresponds to the sloping groove structure of the connector 96. The plug 95 is used to plug and fix with the corresponding upper part of the connector 96. In the initial state, the gap length between the adjusting block 93 and the groove on one side of the keel strip 10 corresponds to the length of the tapered sloping surface of the adjusting block 93.

[0026] After two adjacent plates 1 are placed on the corresponding two keel strips 10, the installer uses a wrench to turn the adjusting screw 2 92, causing the adjusting screw 2 92 to rotate within the thread of the connecting piece 91, and driving the adjusting block 93 to move towards the groove surface of the keel strip 10. During this process, the conical inclined structure of the adjusting block 93 abuts against the two sliding pieces 94 at the upper and lower positions, causing the corresponding sliding pieces 94 to drive the plug 95 downward and the mating joint 96 upward respectively. After the adjusting block 93 moves to be fully abutted against the keel strip 10, the relatively sliding plug 95 and mating joint 96 are adjusted to the corresponding positions. At this time, after the adjacent plug 95 is adjusted to the corresponding position, it is inserted into the corresponding mating joint 96 on the adjacent plate 1 below, completing the docking and fixing of the adjacent plates 1, improving the firmness between the adjacent plates 1 on the tunnel arch curved surface. At the same time, after the adjusting block 93 is fully abutted against the keel strip 10, the corresponding plate 1 is also fixed on the two corresponding keel strips 10 and no longer slides.

[0027] Working principle: When using this prefabricated cement fiber pressure board, the operator first fixes the two keel strips 10 corresponding to the outer side of each board 1 along the tunnel arch lining wall with anchor bolts. When installing the board 1, first fix the four fixing blocks 2 to the corresponding positions at the four corners of the board 1 with bolts. Then fix the rotating frame 3 on each slide 4 to the corresponding fixing block 2 with bolts. Then insert the installation frame 6 at the front and rear horizontal positions into the insertion groove of the two keel strips 10 at the corresponding positions through the downward protruding end on one side, thus completing the placement and installation of a single board 1. Then, place multiple boards 1 corresponding to the direction of the tunnel arch curved surface onto the corresponding two keel strips 10 in sequence, and then lay them one by one to the rear side to complete the rapid installation and laying of the board 1.

[0028] Based on the above, after two adjacent plates 1 are placed on the corresponding two keel strips 10, the installer uses a wrench to turn the adjusting screw 2 92, causing the adjusting screw 2 92 to rotate within the thread of the connecting piece 91, and driving the adjusting block 93 to move towards the groove surface of the keel strip 10. During this process, the conical inclined surface structure of the adjusting block 93 abuts against the two sliding pieces 94 at the upper and lower positions, causing the corresponding sliding pieces 94 to drive the plug 95 downward and the connector 96 upward respectively. The adjusting screw 2 92 drives the adjusting block 93 to move to the desired position. When the keel strip 10 is fully abutted, the relatively sliding plug 95 and connector 96 are adjusted to the corresponding positions. At this time, after adjusting the adjusting screw 92 on the adjacent plate 1 according to the above steps, the adjacent plug 95 is adjusted to the corresponding position and inserted into the corresponding connector 96 on the lower adjacent plate 1, completing the docking and fixing of the adjacent plate 1, improving the firmness between the adjacent plates 1 on the tunnel arch curved surface. At the same time, after the adjusting block 93 is fully abutted against the keel strip 10, the corresponding plate 1 is also fixed on the two corresponding keel strips 10 and no longer slides.

[0029] Based on the above, when there is a deviation between two adjacent arc-shaped plates 1, the installer uses a wrench to turn the adjusting screw 7, causing the adjusting screw 7 to rotate within the fixed block 2 and move towards the rotating frame 3. At this time, because the adjusting screw 7 is slidably connected to the top plate 8, the adjusting screw 7 drives the rotating frame 3 on the fixed block 2 to rotate towards the fixed block 2 on the column below the slide 4 to finely adjust the position of the adjacent arc-shaped plates 1, so that the inner curved surfaces of the two adjacent arc-shaped plates 1 are adjusted to a relatively flat position, which facilitates the subsequent construction of decorative panels or paint.

[0030] Based on the above, when the tunnel is opened to traffic, the gas piston effect generated by the high-speed vehicles passing through will cause the installed plate 1 to be subjected to force. Each plate 1 will move by the fixed blocks 2 at the four corners, which will drive the corresponding rotating frame 3 and slide 4 to squeeze the buffer pad 5 in the mounting frame 6. This will buffer the force and reduce the damage to the fixed connection position caused by the reciprocating deformation of the plate 1 due to the gas piston effect, thereby improving the service life of the plate 1.

[0031] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A prefabricated cement fiber pressure board for tunnel protection, characterized in that, The system includes multiple plates (1), which are arranged sequentially and installed along the inner wall of the tunnel lining. Multiple keel strips (10) are fixed on the tunnel lining wall, and the multiple keel strips (10) are equidistantly distributed along the arched lining wall of the tunnel. The plates (1) are connected to the corresponding keel strips (10) through connecting components, and the curvature of the plates (1) is consistent with the curvature of the arched lining wall at the corresponding position. The connecting components include a fixing block (2), a rotating frame (3), a sliding frame (4), and a mounting frame (6). Each plate (1) has a groove at one of its four corners, and each groove is fixed by bolts. Block (2), fixed block (2) is fixed to the outer side by bolts with a rotating frame (3), the rotating frame (3) is rotatably connected to a slide (4) by a torsion spring, the slide (4) is symmetrically provided with protrusions on the front and rear sides, the slide (4) is limited and slidably connected to the mounting frame (6) through the protrusions, the mounting frame (6) is provided with a downward protruding end on the side away from the slide (4), the mounting frame (6) is slidably connected to the corresponding keel strip (10) through the downward protruding end, a reinforcing component (9) is provided between the keel strip (10) and the mounting frame (6); the keel strip (10) and the mounting frame (6) are fixed by the reinforcing component (9).

2. The prefabricated cement fiber pressure board for tunnel protection according to claim 1, characterized in that, A buffer pad (5) is installed in the groove on the side of the mounting bracket (6) facing the slide (4), and the buffer pad (5) is in contact with the slide (4).

3. The prefabricated cement fiber pressure board for tunnel protection according to claim 1, characterized in that, The mounting brackets (6) at the front and rear horizontal positions of each plate (1) are slidably connected to the same keel strip (10).

4. The prefabricated cement fiber pressure board for tunnel protection according to claim 1, characterized in that, An adjusting screw (7) is threaded into the circular slot above the fixing block (2). The adjusting screw (7) is connected to a top plate (8) at one end facing the slide (4). The top plate (8) is fixed at the notch above the slide (4).

5. A prefabricated cement fiber pressure board for tunnel protection according to claim 4, characterized in that, The end of the adjusting screw (7) that abuts against the top plate (8) is designed as a hemispherical curved surface structure. The hemispherical curved surface abutting end of the adjusting screw (7) is used to slide against the top plate (8).

6. A prefabricated cement fiber pressure board for tunnel protection according to claim 1, characterized in that, The reinforcement component (9) includes a connecting piece (91), which is fixed to the upper wall of the groove on one side of the mounting bracket (6). The connecting piece (91) has an internal threaded connection to an adjusting screw (92). An adjusting block (93) is fixed to the outside of the adjusting screw (92) through the connecting piece (91). The upper and lower outer sides of the adjusting block (93) are both connected to sliding pieces (94). A connector (96) is fixed to the top of the upper sliding piece (94), and a plug (95) is fixed to the bottom of the lower sliding piece (94).

7. A prefabricated cement fiber pressure board for tunnel protection according to claim 6, characterized in that, The slider (94) is vertically limited and slidably installed in the vertical strip openings on both sides of the mounting bracket (6) through notches at symmetrical positions on both sides. The two sliders (94) are connected by two springs.

8. A prefabricated cement fiber pressure board for tunnel protection according to claim 7, characterized in that, The top of the connector (96) is designed with a sloping groove structure, and the bottom of the plug (95) has a shape structure that corresponds to the sloping groove structure of the connector (96).

9. A prefabricated cement fiber pressure board for tunnel protection according to claim 6, characterized in that, The outer side of the adjusting block (93) is designed with a tapered inclined surface structure. The tapered inclined surface structure of the adjusting block (93) is used to adjust the position of the slider (94).

10. A prefabricated cement fiber pressure board for tunnel protection according to claim 9, characterized in that, In the initial state, the gap length between the adjusting block (93) and the groove surface on one side of the keel strip (10) corresponds to the length of the tapered inclined surface of the adjusting block (93).

Images