A construction method for water stop of tunnel bolts passing through waterproof plates

Abstract

The present invention discloses a construction method for water stop of tunnel anchor rods passing through a waterproof board, which includes the following steps: 1) Installation of the water stop tray: After the initial spraying of the tunnel is completed, a sprayed concrete surface is formed on the surrounding rock surface. The water stop tray is sleeved on the exposed anchor rod, and the water stop tray is closely attached to the sprayed concrete surface. 2) Laying of the hot melt pad: The hot melt pad is laid on the sprayed concrete surface outside the water stop tray. 3) Setting of the waterproof board: The exposed anchor rod of the initial support penetrates through the waterproof board, and the waterproof board is attached to the water stop tray. The waterproof board and the water stop tray are fixed by bonding, and the waterproof board and the sprayed concrete surface are connected by hot melting through the hot melt pad; 4) Asphalt filling between the anchor rod and the water stop tray: The gap between the water stop tray and the exposed anchor rod is the asphalt filling area, and asphalt is filled in the asphalt filling area. During the tunnel construction process, the present invention can form a sealed waterproof structure at the weak part where the exposed anchor rod of the initial support passes through the waterproof board, effectively improving the lining resistance.

Description

Technical Field

[0001] The present invention belongs to the technical fields of composite support lining technology and waterproof technology in tunnel engineering, and particularly relates to a construction method for preventing water leakage of tunnel bolts passing through a waterproof board. Background Art

[0002] With the continuous development of domestic transportation infrastructure construction, a large number of tunnel projects need to be built for both highways and railways to shorten the transportation distance. Since a tunnel is a building for motor vehicles to pass through built underground, underwater or in a mountain, due to the use of a waterproof board to separate the primary support and the secondary lining, there is no bolt connection between the two, and no effective connection is formed, so a composite support and lining structure cannot be formed. On the one hand, the support structure is wasted, and on the other hand, the integrity and wholeness of the structure are greatly reduced, weakening the original composite system. As a result, the weakening of the lining structure's resistance and the groundwater leakage formed by some bolts passing through the waterproof board into the tunnel easily cause damage to the tunnel structure, endangering the safety of traffic vehicles and passengers. Summary of the Invention

[0003] In view of the problems in the background art, the present invention proposes a construction method for preventing water leakage of tunnel bolts passing through a waterproof board, which can realize the effective connection of the primary support bolts penetrating the waterproof board and the secondary lining structure, form a composite support and lining structure, improve the tunnel resistance, and at the same time solve the structural waterproof problem of the bolts passing through the waterproof board. Specifically, a water-stop tray is hot-melt welded or bonded with the waterproof board, and asphalt is filled between the bolt and the tray hole, so that the weak parts of the waterproof board and the bolt are effectively combined to form a sealed waterproof structure, achieving the waterproof effect.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A construction method for preventing water leakage of tunnel bolts passing through a waterproof board includes the following steps:

[0006] 1) Installation of the water-stop tray: After the initial spraying of the tunnel is completed, a shotcrete surface is formed on the surface of the surrounding rock. The water-stop tray is sleeved on the exposed bolt, and the water-stop tray is closely attached to the shotcrete surface.

[0007] 2) Laying of the hot-melt pad: A hot-melt pad is laid on the shotcrete surface outside the water-stop tray.

[0008] 3) Setting of the waterproof board: The exposed bolts of the primary support penetrate the waterproof board, and the waterproof board is attached to the water-stop tray. The waterproof board and the water-stop tray are fixed by bonding, and the waterproof board and the shotcrete surface are connected by hot melting through the hot-melt pad;

[0009] 4) Filling of asphalt between the bolt and the water-stop tray: The gap between the water-stop tray and the exposed bolt is the asphalt filling area, and asphalt is filled in the asphalt filling area.

[0010] Preferably, the water stop tray is made of the same material as the waterproof board, and the waterproof board and the water stop tray are combined by hot melt welding.

[0011] Preferably, the hot melt pad is fixed with nails, and the spacing of the nails is 0.5m * 0.5m.

[0012] Advantages of the present invention:

[0013] The present invention realizes the effective connection of the initial support anchor rod penetrating through the waterproof board and the secondary lining structure, forming a composite support and lining structure, improving the tunnel resistance. At the same time, through the water stop tray, the bonding area, the anchor rod through holes form an anchor rod passing through the water stop tray, and by using asphalt to fill the gap between the tray and the anchor rod, a set of sealed waterproof structure is formed, effectively solving the problem of water leakage at the joint between the anchor rod and the waterproof board. The structure is simple in setting and convenient in construction, and can produce good social and economic benefits. Description of the drawings

[0014] Figure 1 It is a schematic cross-sectional view of the construction structure of the anchor rod passing through the waterproof board and the water stop tray of the present invention.

[0015] Figure 2 It is Figure 1 The A-A cross-sectional view of

[0016] Figure 3 It is a cross-sectional view of the water stop tray of the present invention.

[0017] In the figure: 1 - surrounding rock surface, 2 - shotcrete surface, 3 - drainage layer, 4 - waterproof board, 5 - secondary lining concrete, 6 - anchor rod, 7 - water stop tray, 8 - bonding area, 9 - asphalt filling area. Specific embodiments

[0018] In order to make the purpose, technical solution and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the drawings for the convenience of those skilled in the art to understand.

[0019] Referring to the attached Figures 1-3 , the tunnel anchor rod passing through the waterproof board water stop construction method shown includes the following steps:

[0020] 1) Installation of the water stop tray: After the initial spraying of the tunnel is completed, a shotcrete surface 2 is formed on the surface of the surrounding rock surface. The water stop tray 7 is sleeved on the exposed anchor rod, and the water stop tray 7 is closely attached to the shotcrete surface 2.

[0021] 2) Laying of the hot melt pad: The hot melt pad 8 is laid on the shotcrete surface 2 outside the water stop tray 7.

[0022] 3) Waterproof board installation: Make the exposed bolt 6 of the initial support penetrate through the waterproof board 4, attach the waterproof board 4 to the water stop tray 7, fix the waterproof board 4 and the water stop tray 7 together by bonding, and connect the waterproof board 4 and the shotcrete surface 2 by hot melt pads 8 in a hot melt manner.

[0023] 4) Asphalt filling between the bolt and the water stop tray: The gap between the water stop tray 7 and the exposed bolt 6 is the asphalt filling area 9, and fill asphalt in the asphalt filling area 9.

[0024] The hot melt pads 8 are fixed with nails, and the spacing of the nails is 0.5m * 0.5m.

[0025] In this embodiment, the material of the water stop tray is the same as that of the waterproof board. The connection method between the waterproof board 4 and the water stop tray 7 is preferably combined by hot melt welding, with a simple construction method, greatly saving costs and strong operability.

[0026] Among them, the middle part of the water stop tray 7 is a protruding frustum, and a conical through hole 10 is provided at the corresponding frustum position, and a round hole is opened on the waterproof board 4.

[0027] The specific construction process is as follows: After the initial spraying of the tunnel is completed, the water stop tray 7 is sleeved on the exposed bolt 6 through the through hole 10, with the frustum facing outwards. The inner side of the water stop tray 7 is attached to the shotcrete surface 2, and the gap between the water stop tray 7 and the shotcrete surface 2 is the drainage layer 3. The waterproof board 4 passes through the bolt 6 through the round hole in the board body and then is sleeved on the frustum of the water stop tray 7. The waterproof board 4 and the water stop tray 7 are combined together by hot melt welding or bonding, so that the water stop tray 7 and the waterproof board 4 form a whole. The waterproof board 4 and the shotcrete surface 2 are connected by hot melt pads 8 in a hot melt manner, making the waterproof board 4 firmly installed. A reserved asphalt filling area 9 is provided between the water stop tray 7 and the bolt 6, and asphalt is filled in the asphalt filling area 9 to fill the gap densely, forming a whole sealed waterproof structure and a composite initial support and secondary lining structure form with an effective connection between the initial support and the secondary lining, and at the same time achieving the anti-corrosion treatment effect at the joint of the bolt and the waterproof board.

[0028] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A construction method for water stop of tunnel bolts passing through waterproof plates, characterized in that, The following steps are involved: S1. Installation of water-stop tray: The middle part of the water-stop tray (7) is a protruding truncated cone, on which a conical through hole (10) is provided; after the initial spraying of the tunnel is completed, a sprayed concrete surface (2) is formed on the surface of the surrounding rock surface, and the water-stop tray (7) is placed on the exposed anchor rod, with the truncated cone of the water-stop tray (7) facing outward, and the side of the water-stop tray (7) away from the truncated cone is closely attached to the sprayed concrete surface (2), and the gap between the water-stop tray (7) and the sprayed concrete surface (2) is a drainage layer (3); S2, hot melt pad laying: laying a hot melt pad (8) on the sprayed concrete surface (2) outside the water stop tray (7); S3. Setting of waterproof board: the exposed anchor rod (6) of the initial support penetrates the waterproof board (4), the waterproof board (4) is attached to the water stop tray (7), the waterproof board (4) and the water stop tray (7) are fixed by bonding on the side adjacent to the truncated cone, and the waterproof board (4) and the sprayed concrete surface (2) are connected by hot melt pad (8); S4. Asphalt filling between the anchor rod and the water stop tray: the gap between the water stop tray (7) and the exposed anchor rod (6) is the asphalt filling area (9), and asphalt is filled in the asphalt filling area (9); the material of the water stop tray (7) is the same as that of the waterproof board (4), and the waterproof board (4) and the water stop tray (7) are combined together by hot melt welding.

2. The water stop construction method of the tunnel bolt passing through the waterproof board according to claim 1 is characterized in that: The hot melt pad (8) is fixed with nails, and the nails are arranged at a spacing of 0.5m*0.5m.

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