Water-rich tunnel excavation supporting structure

Abstract

The utility model discloses a water-rich tunnel excavation supporting structure, and relates to the technical field of tunnel construction, the water-rich tunnel excavation supporting structure comprises a base and a moving mechanism used for driving the base to move, a supporting frame is fixedly arranged on the base, a front top plate and a rear top plate are fixedly arranged on the supporting frame, the front top plate and the rear top plate are both in an arc shape, and the moving mechanism is arranged on the base. The cambered surface radius of the front top plate is larger than that of the rear top plate, the front top plate is used for abutting against the tunnel wall, and a concrete spraying space is formed between the front top plate and the rear top plate. The rebound rate of the tunnel wall can be effectively controlled after concrete is sprayed to the water-rich section of the tunnel, and then the possibility that the tunnel vault collapses is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of tunnel construction, and in particular to a water-rich tunnel excavation support structure. Background Art

[0002] During the tunnel excavation process, it is necessary to spray concrete on the newly excavated tunnel wall to reinforce the tunnel wall. However, when the tunnel construction passes through a water-rich section, the structural layer of the tunnel wall is relatively sparse, resulting in serious overconsumption of sprayed concrete. After the tunnel wall is sprayed with concrete, it is prone to large-scale rebound, causing the tunnel vault to collapse. Utility Model Content

[0003] In view of the problems existing in the prior art, the present application provides a water-rich tunnel excavation support structure, which can effectively control the rebound rate of the tunnel wall in the water-rich section of the tunnel after spraying concrete, thereby reducing the possibility of collapse of the tunnel vault.

[0004] The present application provides a water-rich tunnel excavation support structure, which adopts the following technical solution:

[0005] A water-rich tunnel excavation support structure includes a base and a moving mechanism for driving the base to move, the base is fixedly provided with a support frame, the support frame is fixedly provided with a front top plate and a rear top plate, the front top plate and the rear top plate are both arc-shaped, and the arc radius of the front top plate is larger than the arc radius of the rear top plate, the front top plate is used to abut against the tunnel wall, and a concrete spraying space is provided between the front top plate and the rear top plate.

[0006] Optionally, the mobile mechanism includes a plurality of track frames laid on the tunnel floor, guide rails fixedly mounted on the track frames, and rollers rotatably mounted on a base, each of the track frames being fixedly mounted with at least two guide rails, the guide rails on each track frame corresponding to each other, and the corresponding guide rails being spliced ​​in sequence, a plurality of groups of rollers being mounted on the base, each group of rollers corresponding to one guide rail, and the rollers being rollingly connected to the corresponding guide rails.

[0007] Optionally, a fixing assembly for fixing the two track frames is provided between two adjacent track frames.

[0008] Optionally, the fixing assembly includes a connecting frame, a first clamping frame, a second clamping frame and a limiting member, wherein the first clamping frame is fixedly disposed on the connecting frame, and the second clamping frame is slidably disposed on the connecting frame in a direction approaching or moving away from the first clamping frame, and the first clamping frame and the second clamping frame are respectively used to clamp two adjacent track frames, and the limiting member is used to prevent the second clamping frame from sliding.

[0009] Optionally, the limiting member includes a limiting screw, the limiting screw is rotatably disposed on the connecting frame, and the limiting screw is threadably matched with the second clamping frame.

[0010] Optionally, a rocker arm is rotatably provided on the base, a driving source for driving the rocker arm to rotate is provided on the base, a pressure spray gun is provided on the rocker arm, the pressure spray gun is directed toward the concrete spraying space between the front top plate and the rear top plate, and a feeding mechanism for conveying concrete to the pressure spray gun is provided on the base.

[0011] Optionally, the driving source includes a servo motor, the servo motor is fixed on the base, a worm is coaxially fixed on the output shaft of the servo motor, a worm wheel is coaxially fixed on the rotating shaft of the rocker arm, and the worm wheel is meshed with the worm.

[0012] Optionally, the feeding mechanism includes a stirring tank, a conveying pump and a material guide pipe, the stirring tank is fixedly arranged on a base, the conveying pump is fixedly arranged at the bottom of the stirring tank, and the inlet end of the conveying pump is connected to the stirring tank, one end of the material guide pipe is connected to the conveying pump, and the other end of the material guide pipe is connected to a pressure spray gun.

[0013] In summary, the present application includes at least one of the following beneficial technical effects:

[0014] 1. As the tunnel is excavated, the base is driven to move by the moving mechanism, and the tunnel wall at the newly excavated position is supported by the front top plate to prevent the newly excavated tunnel wall from rebounding. As the base moves, concrete is sprayed into the sprayed concrete space between the front top plate and the rear top plate to reinforce the tunnel wall at the newly excavated position, and the rear top plate supports the tunnel wall after the spraying of concrete, thereby effectively controlling the rebound rate of the tunnel wall after spraying concrete and reducing the possibility of collapse of the tunnel vault.

[0015] 2. This application sets a rocker arm on the base. As the tunnel is excavated, concrete is delivered to the pressure spray gun through the feeding mechanism, and the rocker arm rotates to spray concrete into the concrete spraying space between the front top plate and the rear top plate, thereby improving the uniformity of concrete spraying and reducing the labor intensity of the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0017] Figure 2 It is a schematic diagram of the structure of the base used to express the embodiment of the present application;

[0018] Figure 3 It is a structural schematic diagram used to express the connecting frame in an embodiment of the present application.

[0019] Explanation of the accompanying drawings: 1. base; 11. driving source; 111. worm; 12. mixing tank; 13. conveying pump; 14. material guide pipe; 15. roller; 2. support frame; 21. front top plate; 22. rear top plate; 3. rocker arm; 31. worm gear; 32. pressure spray gun; 4. track frame; 41. guide rail; 5. connecting frame; 51. first clamping frame; 52. second clamping frame; 53. limiting screw. DETAILED DESCRIPTION

[0020] The following is combined with Figure 1-3 This application is described in further detail.

[0021] The present application embodiment discloses a water-rich tunnel excavation support structure. Figure 1 , including a base 1, a support frame 2 fixedly arranged on the base 1, and a rocker arm 3 rotatably arranged on the base 1, a front top plate 21 and a rear top plate 22 are fixedly arranged on the support frame 2, the front top plate 21 and the rear top plate 22 are gap-matched, and a concrete spraying space for spraying concrete is formed at the gap between the front top plate 21 and the rear top plate 22.

[0022] Reference Figure 1 The front top plate 21 and the rear top plate 22 are both arc-shaped, and the arc radius of the front top plate 21 is larger than that of the rear top plate 22. As the tunnel is excavated, the base 1 is pushed to move, and the front top plate 21 supports the tunnel wall at the newly excavated position, and the rear top plate 22 supports the tunnel wall after concrete spraying, thereby effectively controlling the rebound rate of the tunnel wall after concrete spraying and reducing the possibility of collapse of the tunnel vault.

[0023] Reference Figure 2 A driving source 11 for driving the rocker arm 3 to rotate is provided on the base 1, and the driving source 11 includes a servo motor, which is fixed on the base 1. A worm 111 is coaxially fixed on the output shaft of the servo motor, and a worm wheel 31 is coaxially fixed on the rotating shaft of the rocker arm 3. The worm wheel 31 is meshed with the worm 111. By setting the worm wheel 31 and the worm 111 to drive the rocker arm 3 to rotate, sudden power failure of the servo motor can be avoided, thereby increasing construction safety.

[0024] Reference Figure 2 A pressure spray gun 32 is arranged on the rocker arm 3, and the pressure spray gun 32 faces the concrete spraying space between the front top plate 21 and the rear top plate 22. A feeding mechanism for conveying concrete to the pressure spray gun 32 is arranged on the base 1, and the feeding mechanism includes a mixing tank 12, a delivery pump 13 and a guide pipe 14. A bracket is fixedly arranged on the base 1, the mixing tank 12 is fixedly arranged on the bracket, the delivery pump 13 is fixedly arranged at the bottom of the mixing tank 12, and the inlet end of the delivery pump 13 is connected to the mixing tank 12, one end of the guide pipe 14 is connected to the delivery pump 13, and the other end of the guide pipe 14 is connected to the pressure spray gun 32.

[0025] Reference Figure 1 , 2 A moving mechanism for driving the base 1 to move is provided in the tunnel, and the moving mechanism includes a plurality of track frames 4 laid on the tunnel floor, guide rails 41 fixedly provided on the track frames 4, and rollers 15 rotatably provided on the base 1. Two guide rails 41 are fixedly provided on each track frame 4, and the length directions of the two guide rails 41 are parallel. The guide rails 41 on each track frame 4 correspond to each other one by one, and the guide rails 41 corresponding to each other on each track frame 4 are spliced ​​in sequence. Two groups of rollers 15 are provided on the base 1, and the rollers 15 are rotatably provided on the base 1. Each group of rollers 15 corresponds to a guide rail 41, and the rollers 15 are rollingly connected with the corresponding guide rails 41.

[0026] Reference Figure 1 , 3 A fixing assembly for fixing the two track frames 4 is arranged between the two adjacent track frames 4, and the fixing assembly includes a connecting frame 5, a first clamping frame 51, a second clamping frame 52 and a limiting member. The first clamping frame 51 is fixedly arranged on the connecting frame 5, and the second clamping frame 52 is slidably arranged on the connecting frame 5 along a direction approaching or moving away from the first clamping frame 51. Two sliding grooves are provided on the connecting frame 5 along the sliding direction of the second clamping frame 52, and two sliders are fixedly arranged on the second clamping frame 52, each slider corresponds to a sliding groove, and the slider is slidably arranged in the corresponding sliding groove; the limiting member includes a limiting screw 53, and the limiting screw 53 is rotatably arranged on the connecting frame 5, and the length direction of the limiting screw 53 is parallel to the sliding direction of the second clamping frame 52, and the limiting screw 53 is threadedly matched with the second clamping frame 52.

[0027] The implementation principle of a water-rich tunnel excavation support structure in an embodiment of the present application is as follows: a track frame 4 is arranged in advance in the tunnel, and as the tunnel is excavated, the base 1 is pushed to move on the track frame 4, and the tunnel wall at the newly excavated position is supported by the front top plate 21 to prevent the newly excavated tunnel wall from rebounding, and as the base 1 moves, the concrete in the mixing tank 12 is transported to the pressure spray gun 32 by the delivery pump 13, and the rocker arm 3 rotates to spray concrete into the concrete spraying space between the front top plate 21 and the rear top plate 22, so as to reinforce the tunnel wall at the newly excavated position, and the tunnel wall after the concrete spraying is completed is supported by the rear top plate 22, thereby effectively controlling the rebound rate of the tunnel wall after the concrete is sprayed, and reducing the possibility of collapse of the tunnel vault.

[0028] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A water-rich tunnel excavation support structure, characterized in that: The invention comprises a base (1) and a moving mechanism for driving the base (1) to move, wherein a support frame (2) is fixedly arranged on the base (1), and a front top plate (21) and a rear top plate (22) are fixedly arranged on the support frame (2), wherein the front top plate (21) and the rear top plate (22) are both arc-shaped, and the arc radius of the front top plate (21) is greater than the arc radius of the rear top plate (22), the front top plate (21) is used to abut against a tunnel wall, and a concrete spraying space is arranged between the front top plate (21) and the rear top plate (22).

2. A water-rich tunnel excavation support structure according to claim 1, characterized in that: The moving mechanism comprises a plurality of track frames (4) laid on the tunnel floor, guide rails (41) fixedly arranged on the track frames (4), and rollers (15) rotatably arranged on a base (1), each of the track frames (4) being fixedly arranged with at least two guide rails (41), the guide rails (41) on each of the track frames (4) corresponding to each other, and the guide rails (41) corresponding to each other are spliced ​​in sequence, and a plurality of groups of rollers (15) are arranged on the base (1), each group of rollers (15) corresponding to one guide rail (41), and the rollers (15) are rollingly connected to the corresponding guide rails (41).

3. A water-rich tunnel excavation support structure according to claim 2, characterized in that: A fixing assembly for fixing the two track frames (4) is provided between two adjacent track frames (4).

4. A water-rich tunnel excavation support structure according to claim 3, characterized in that: The fixing assembly comprises a connecting frame (5), a first clamping frame (51), a second clamping frame (52) and a limiting member, wherein the first clamping frame (51) is fixedly arranged on the connecting frame (5), and the second clamping frame (52) is slidably arranged on the connecting frame (5) in a direction approaching or moving away from the first clamping frame (51), and the first clamping frame (51) and the second clamping frame (52) are respectively used to clamp two adjacent track frames (4), and the limiting member is used to prevent the second clamping frame (52) from sliding.

5. A water-rich tunnel excavation support structure according to claim 4, characterized in that: The limiting member comprises a limiting screw (53), the limiting screw (53) is rotatably arranged on the connecting frame (5), and the limiting screw (53) is threadably matched with the second clamping frame (52).

6. The water-rich tunnel excavation support structure according to claim 1, characterized in that: A rocker arm (3) is rotatably arranged on the base (1), a driving source (11) for driving the rocker arm (3) to rotate is arranged on the base (1), a pressure spray gun (32) is arranged on the rocker arm (3), the pressure spray gun (32) faces the concrete spraying space between the front top plate (21) and the rear top plate (22), and a feeding mechanism for conveying concrete to the pressure spray gun (32) is arranged on the base (1).

7. A water-rich tunnel excavation support structure according to claim 6, characterized in that: The driving source (11) comprises a servo motor, the servo motor is fixedly arranged on the base (1), a worm (111) is coaxially fixedly arranged on the output shaft of the servo motor, a worm wheel (31) is coaxially fixedly arranged on the rotating shaft of the rocker arm (3), and the worm wheel (31) is meshed with the worm wheel (111).

8. The water-rich tunnel excavation support structure according to claim 6, characterized in that: The feeding mechanism comprises a stirring tank (12), a delivery pump (13) and a material guide pipe (14); the stirring tank (12) is fixedly arranged on a base (1); the delivery pump (13) is fixedly arranged at the bottom of the stirring tank (12); an inlet end of the delivery pump (13) is connected to the stirring tank (12); one end of the material guide pipe (14) is connected to the delivery pump (13); and the other end of the material guide pipe (14) is connected to a pressure spray gun (32).

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