A construction method for spraying concrete on the initial support of a tunnel with a slide plate covered by a film

Abstract

The present invention discloses a construction method for covering a sliding formwork with a film in the initial support shotcrete of a tunnel, which includes the following steps. Step 1: Fabricate a sliding device. The sliding device includes an arc-shaped track adapted to the curvature of the tunnel roof. A support plate is slidably mounted on the arc-shaped track. Along the length direction of the support plate, a first guide wheel, a second guide wheel, and a reel bracket are successively provided. The installation height of the first guide wheel exceeds the upper surface of the support plate, and a pressure spray gun is provided at the front end of the support plate. Step 2: Rotationally mount an isolation film reel on the reel bracket, then pull out the free end of the film and fix it at the starting position of the concrete spraying, and the pulled-out film is supported on the first guide wheel and the second guide wheel. Step 3: Slide the support plate upward from the bottom of the arc-shaped track and simultaneously use the pressure spray gun to spray concrete onto the inner wall of the tunnel. The beneficial effects of the present invention are: it can reduce material waste, ensure uniform thickness of the tunnel shotcrete, and improve the quality of the engineering construction.

Description

Technical Field

[0001] The present invention relates to a construction method for shotcrete, and particularly to a construction method for covering a slide plate with a film in the initial support of shotcrete for tunnels. Background Art

[0002] Tunnels are an important part of underground engineering. How to ensure the construction quality and reduce material waste during the construction process is an issue that must be considered and solved.

[0003] During the construction of tunnel projects, it is necessary to promptly carry out initial support for newly excavated tunnels, and shotcrete is used for surface support in the initial support. Since the shotcrete support surface of the tunnel is vertical or downward-facing, it will cause uneven shotcrete, resulting in poor construction quality, and the rebound of shotcrete during the construction process will cause waste of materials. Summary of the Invention

[0004] In view of this, the present invention provides a construction method for covering a slide plate with a film in the initial support of shotcrete for tunnels, which can reduce material waste and improve the construction quality of the project during the construction of the initial support of shotcrete for tunnels.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] A construction method for covering a slide plate with a film in the initial support of shotcrete for tunnels, which is characterized by including the following steps:

[0007] Step 1: Fabricate a sliding device inside the newly excavated tunnel. The sliding device includes an arc-shaped track adapted to the curvature of the tunnel top. A support plate is slidably installed on the arc-shaped track. A first guide wheel, a second guide wheel, and a reel bracket are sequentially arranged in the length direction of the support plate. The installation height of the first guide wheel exceeds the upper surface of the support plate, and a pressure spray gun is provided at the front end of the support plate.

[0008] Step 2: Rotationally fit an isolation film reel on the reel bracket, and then pull out the free end of the film on the isolation film reel and fix it at the starting position of concrete spraying. The pulled-out film is required to be supported on the first guide wheel and the second guide wheel.

[0009] Step 3: Slide the support plate upward from the bottom of the arc-shaped track, and simultaneously use the pressure spray gun to spray concrete towards the tunnel inner wall. Use the upwardly warped and bent section (d) at the end of the support plate (1b) to squeeze the concrete rebounded onto the support plate (1b) onto the surface of the initial support.

[0010] With the above structure, when carrying out the initial support for a newly excavated tunnel, first make a sliding device according to the radius of the tunnel, then rotate and sleeved the isolation film reel on the reel support, pull out the free end of the film on the isolation film reel and pass it through the second guide wheel and the first guide wheel in sequence, and finally fix it at the starting position of the concrete spraying; then slide the support plate upward from the bottom of the arc track, and at the same time use a pressure spray gun to spray concrete towards the inner wall of the tunnel. During the sliding process of the support plate, the film is driven to slide out through the second guide wheel and the first guide wheel and supported on the upper surface of the support plate. At this time, the concrete falling from the inner wall of the tunnel will fall on the film. Since the installation height of the first guide wheel exceeds the upper surface of the support plate, when the film passes through the first guide wheel, it can press the falling concrete back to the inner wall of the tunnel, avoiding the waste of the falling concrete. At the same time, the first guide wheel can accurately control the thickness of the initial support concrete of the tunnel and generate a rolling pressure for finishing to improve the appearance quality of its surface layer.

[0011] Preferably: The pressure spray gun is slidably assembled in the width direction of the support plate. With the above structure, the spraying range of the pressure spray gun is wider.

[0012] Preferably: The pressure spray gun is rotatably installed on the support plate in a ball hinge manner. With the above structure, the pressure spray gun can be used more flexibly, and the spraying range of the pressure spray gun is expanded.

[0013] Preferably: The end of the support plate is provided with a bent section that tilts upward, and the first guide wheel is rotatably installed on the bent section. With the above structure, the installation height of the first guide wheel is higher than that of the support plate. When the film passes through the first guide wheel, it can press the falling concrete back to the inner wall of the tunnel, and at the same time, the thickness of the sprayed concrete can be ensured to be uniform, improving the quality of the project construction.

[0014] Preferably: In the first step, two groups of support plates are slidably installed on the arc track. In the third step, the two groups of support plates slide upward synchronously from the bottoms at both ends of the arc track, and symmetrical construction is carried out on the left and right in the tunnel. With the above structure, the construction efficiency of the project can be improved.

[0015] Preferably: When both groups of support plates slide to the top position of the tunnel during construction, retract one group of support plates a certain distance, and make the other group of support plates continue to construct forward until the sprayed concrete exceeds the intersection line at the top of the tunnel. With the above structure, it is convenient to spray concrete to the top position of the tunnel and avoid generating construction joints.

[0016] Preferably: In the second step, the distance between the fixed point of the free end of the film and the inner wall of the tunnel is equal to the distance between the first guide wheel and the inner wall of the tunnel. With the above structure, the thickness of the sprayed concrete on the inner wall of the tunnel is ensured to be uniform, and the quality of the project construction is further improved.

[0017] Preferably, a holding bracket is fixedly welded in the space enclosed by the arc-shaped track, and wheels are installed at the bottom of the holding bracket. With the above structure, the arc-shaped track can be stably supported. At the same time, by moving the holding bracket, it is convenient to spray concrete on the inner wall of the entire tunnel, improving the engineering construction efficiency.

[0018] Preferably, the reel bracket is arranged on the lower side of the support plate. There are through holes on the support plate, and the second guide wheel is installed near the through holes. The film passes upward through the through holes and is supported on the second guide wheel by rolling. With the above structure, it is convenient to pull out the film and support it by rolling on the upper surface of the support plate.

[0019] Preferably, the number of the arc-shaped tracks is set to two groups, which are respectively located at both ends in the width direction of the support plate. Arc-shaped grooves are provided on the arc-shaped tracks, and rollers adapted to the arc-shaped grooves are provided at both ends of the support plate. With the above structure, it is convenient for the support plate to slide on the arc-shaped track.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] By adopting the construction method of spraying concrete on the slide plate with film covering for the primary support of a tunnel provided by the present invention, it can ensure the uniform thickness of the sprayed concrete in the tunnel, improve the visual quality of the surface layer, and thus improve the engineering construction quality. At the same time, it also reduces the material waste of the sprayed concrete, is beneficial to green construction, and can bring certain economic and social benefits. Description of the Drawings

[0022] Figure 1 It is a schematic cross-sectional structure diagram of a construction method of spraying concrete on a slide plate with film covering for the primary support of a tunnel;

[0023] Figure 2 It is Figure 1 a partial enlarged view of the position of one of the support plates 1b in

[0024] Figure 3 a partial structural diagram of the sliding device 1;

[0025] Figure 4 It is another partial structural diagram of the sliding device 1 (bottom view). Detailed Embodiments

[0026] The present invention will be further described below in conjunction with the embodiments and the drawings.

[0027] As shown in Figure 1 and Figure 2 a construction method of spraying concrete on a slide plate with film covering for the primary support of a tunnel includes the following steps:

[0028] Step 1: When carrying out the initial support for the newly excavated tunnel 3, first fabricate the sliding device 1. The sliding device 1 includes an arc-shaped track 1a adapted to the tunnel. A support plate 1b matching its radian is slidably installed on the arc-shaped track 1a. In this embodiment, the support plate 1b is made of a 1-cm thick steel plate. Along the length direction of the support plate 1b, a first guide wheel a, a second guide wheel b, and a reel support c are sequentially provided. Among them, the installation height of the first guide wheel a exceeds the upper surface of the support plate 1b. In this embodiment, the diameters of both the first guide wheel a and the second guide wheel b are 3 cm. A pressure spray gun 1c is provided at the front end of the support plate 1b, that is, the pressure spray gun 1c is arranged at one end of the support plate 1b away from the first guide wheel a.

[0029] Step 2: Please refer Figure 3 , rotate and sleave the isolation film reel 2 on the reel support c, then pull out the free end of the film on the isolation film reel 2 and fix it at the starting position of the shotcrete, that is, the bottom of the arc-shaped track 1a. The pulled-out film is required to be supported on the first guide wheel a and the second guide wheel b.

[0030] Step 3: Slide the support plate 1b upward from the bottom of the arc-shaped track 1a, and at the same time use the pressure spray gun 1c to spray concrete towards the inner wall of the tunnel. Use the upwardly warped and bent section (d) at the end of the support plate (1b) to squeeze the concrete rebounded and dropped onto the support plate (1b) onto the surface of the initial support.

[0031] According to the above steps, during the sliding process of the support plate 1b, since the free end of the film on the isolation film reel 2 is fixed at the bottom of the arc-shaped track 1a, the film will be pulled out as the support plate 1b slides and is located on the upper surface of the support plate 1b. During the concrete spraying process, some concrete will fall on the film. Since the installation height of the first guide wheel a is higher than the upper surface of the support plate 1b, when the film passes through the first guide wheel a, it can press the concrete 4 dropped on the film back to the inner wall of the tunnel, avoiding the waste of the dropped concrete 4. At the same time, the first guide wheel a can accurately control the thickness of the concrete 4 for the initial support of the tunnel and generate a rolling pressure for finishing to improve the surface quality of its surface layer.

[0032] Furthermore, please refer Figure 3 , the reel support c is arranged on the lower side of the support plate 1b. A through hole 1b1 is provided on the support plate 1b. The second guide wheel b is installed at a position close to the through hole 1b1. The film on the isolation film reel 2 passes upward through the support plate 1b through the through hole 1b1 and is rollingly supported on the second guide wheel b. With such a design, it is convenient to pull out the film and rollingly support it on the upper surface of the support plate 1b.

[0033] Still further, as Figure 3As shown in the figure, a chute 1b3 formed in the width direction is provided at the front end of the support plate 1b. A sliding seat 1b4 is slidably assembled on the chute 1b3. The pressure spray gun 1c is rotatably installed on the sliding seat 1b4 by means of a ball hinge. With such a design, the pressure spray gun 1c can slide left and right flexibly and rotate the angle on the support plate 1b, so that the spraying range of the pressure spray gun 1c is wider and more comprehensive.

[0034] Furthermore, please refer to Figure 2 . An upturned bending section d is provided at the end of the support plate 1b. The first guide wheel a is rotatably installed on the bending section d. In this embodiment, the vertical distance between the first guide wheel a and the upper surface of the support plate 1b is 10 cm, which ensures that the first guide wheel a is higher than the upper surface of the support plate 1b, and is more conducive to accurately controlling the thickness of the initial support concrete in the tunnel through the first guide wheel a and improving the quality and appearance of the surface layer.

[0035] Still further, please refer to Figure 1 . In step one, two groups of support plates 1b are slidably installed on the arc track 1a, which are located at the left and right ends of the arc track 1a respectively. The two groups of support plates 1b are equipped with the same first guide wheel a, second guide wheel b, reel bracket c and pressure spray gun 1c. In step three, the two groups of support plates 1b slide upward synchronously from the bottom ends of the arc track 1a, and symmetric construction is carried out on the left and right in the tunnel, which greatly improves the engineering construction efficiency. When both groups of support plates 1b slide to the top position of the tunnel, concrete cannot be sprayed at the top position. At this time, one of the groups of support plates 1b can be retracted a certain distance to ensure that the other group of support plates 1b can continue to construct forward until the sprayed concrete exceeds the intersection line at the top of the tunnel, avoiding the generation of construction joints.

[0036] Still further, the distance between the fixed point of the free end of the film on the isolation film reel 2 and the inner wall of the tunnel is equal to the distance between the first guide wheel a and the inner wall of the tunnel. With such a design, the thickness of the sprayed concrete on the inner wall of the tunnel is ensured to be uniform, and the engineering construction quality is further improved.

[0037] Furthermore, please refer to Figure 3 and 4 . The number of arc tracks 1a is set to two groups, which are located at both ends in the width direction of the support plate 1b. Arc-shaped grooves 1a1 are provided on the arc tracks 1a. Rollers 1b2 adapted to the arc-shaped grooves 1a1 are provided at both ends of the support plate 1b. In this embodiment, four groups of rollers are provided, which facilitates the sliding of the support plate 1b on the arc track 1a. Still further, please refer to Figure 1, a holding bracket 1e is fixedly welded inside the space enclosed by the arc-shaped track 1a for stably supporting the arc-shaped track 1a. In this embodiment, the holding bracket 1e is made of channel steel. The horizontal section of the holding bracket 1e is welded with steel plates or steel wire meshes, which can be used as an operating platform for construction workers. At the same time, wheels are installed at the bottom of the holding bracket 1e. By moving the holding bracket 1e, it is convenient to spray concrete on the inner wall of the entire tunnel, further improving the engineering construction efficiency.

[0038] Finally, it should be noted that the above description is only the preferred embodiment of the present invention. Under the inspiration of the present invention, those of ordinary skill in the art can make various similar representations without violating the purpose and claims of the present invention. Such transformations all fall within the protection scope of the present invention.

Claims

1. A construction method for covering a tunnel initial support shotcrete slide with a film, characterized in that, It includes the following steps: Step 1: Fabricate a sliding device (1) inside the newly excavated tunnel. The sliding device (1) includes an arc-shaped track (1a) adapted to the arc of the tunnel top. A support plate (1b) is slidably mounted on the arc-shaped track (1a). Along the length direction of the support plate (1b), a first guide wheel (a), a second guide wheel (b), and a reel support (c) are sequentially provided. The installation height of the first guide wheel (a) exceeds the upper surface of the support plate (1b). A pressure spray gun (1c) is provided at the front end of the support plate (1b); a bent section (d) that tilts upward is provided at the end of the support plate (1b), and the first guide wheel (a) is rotatably mounted on the bent section (d); Step 2: Rotationally fit an isolation film reel (2) on the reel support (c), then pull out the free end of the film on the isolation film reel (2) and fix it at the starting position of concrete spraying. The pulled-out film is required to be supported on the first guide wheel (a) and the second guide wheel (b); the reel support (c) is arranged on the lower side of the support plate (1b). A through hole (1b1) is provided on the support plate (1b). The second guide wheel (b) is installed at a position close to the through hole (1b1). The film passes upward through the support plate (1b) via the through hole (1b1) and is rollingly supported on the second guide wheel (b); Step 3: Slide the support plate (1b) upward from the bottom of the arc-shaped track (1a), and simultaneously use the pressure spray gun (1c) to spray concrete towards the tunnel inner wall.

2. The construction method of covering the slide plate of the sprayed concrete for the initial support of the tunnel according to claim 1, characterized in that: The pressure spray gun (1c) is slidably assembled in the width direction of the support plate (1b).

3. A construction method for covering a tunnel initial support shotcrete slide with a film, according to claim 1 or 2, characterized in that: The pressure spray gun (1c) is rotatably mounted on the support plate (1b) in a ball hinge manner.

4. A construction method for spraying concrete on the initial support of a tunnel with a slide plate covered with a film, characterized in that: In Step 1, two groups of support plates (1b) are slidably mounted on the arc-shaped track (1a). In Step 3, the two groups of support plates (1b) slide upward synchronously from the bottoms at both ends of the arc-shaped track (1a) to perform left-right symmetric construction in the tunnel.

5. A construction method for spraying concrete on the initial support of a tunnel with a slide plate covered by a film, characterized in that: When both groups of support plates (1b) have slid to the tunnel top position during construction, retract one group of support plates (1b) a certain distance, and make the other group of support plates (1b) continue to construct forward until the sprayed concrete exceeds the tunnel top intersection line.

6. A construction method for covering a tunnel initial support shotcrete slide with a film, as described in claim 1, characterized in that: In Step 2, the distance between the fixed point of the free end of the film and the tunnel inner wall is equal to the distance between the first guide wheel (a) and the tunnel inner wall.

7. A construction method for covering a slide plate of shotcrete in the initial support of a tunnel according to claim 1, characterized in that: A retaining bracket (1e) is fixedly welded inside the space enclosed by the arc-shaped track (1a), and wheels are installed at the bottom of the retaining bracket (1e).

8. A construction method for spraying concrete on the initial support of a tunnel with a slide plate covered with a film, characterized in that: The number of the arc-shaped tracks (1a) is set to two, which are respectively located at both ends in the width direction of the support plate (1b). Arc-shaped grooves (1a1) are provided on the arc-shaped tracks (1a), and rollers (1b2) adapted to the arc-shaped grooves (1a1) are provided at both ends of the support plate (1b).

Images