Tunnel water-rich area deformation joint secondary lining waterproof structure

Abstract

The utility model discloses a tunnel water-rich area deformation joint secondary lining waterproof structure in the technical field of tunnel construction, which comprises a concrete spraying layer, non-woven geotechnical cloth is arranged on the outer side of the concrete spraying layer, and a waterproof plate is arranged on one side, far away from the concrete spraying layer, of the non-woven geotechnical cloth. A lining layer is arranged on the side, away from the geotechnical cloth, of the waterproof plate, a deformation joint is formed in the lining layer, a back-attached type water stop belt and a middle-buried type water stop belt are sequentially arranged on the deformation joint in the direction away from the waterproof plate, the back-attached type water stop belt is provided with a back-attached side, the back-attached side is connected with the surface of the waterproof plate, and the middle-buried type water stop belt is connected with the surface of the middle-buried type water stop belt. The deformation joint is divided into a first joint body and a second joint body by the middle-buried water stop belt, the first joint body is filled with a first filler, and the second joint body is filled with a second filler; and the waterproof effect of the whole structure is effectively improved through the combination mode of the non-woven geotextile, the waterproof plate, the back-attached type water stop belt and the middle-buried type water stop belt.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel construction, in particular to a secondary lining waterproof structure for a deformation joint in a water-rich area of ​​a tunnel. Background Art

[0002] Waterproof construction is one of the key difficulties in the construction of water-rich tunnels, especially when water leakage is prone to occur at the construction joints and deformation joints of the secondary lining. The existing conventional method is adopted: a closed back-sticking rubber waterstop is set along the outer side of the secondary lining, and a closed middle-buried rubber waterstop is pre-buried in the middle of the lining to deal with the deformation joints in the water-rich area, but the waterproof effect of the secondary lining in the above method needs to be further improved. Utility Model Content

[0003] In order to overcome the deficiencies of the prior art, the technical problem to be solved by the utility model is: how to improve the waterproof effect of the secondary lining.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] The second lining waterproof structure of the deformation joint in the water-rich area of ​​the tunnel comprises a concrete spraying layer, a non-woven geotextile is arranged on the outer side of the concrete spraying layer, a waterproof board is arranged on the side of the non-woven geotextile away from the concrete spraying layer, a lining layer is arranged on the side of the waterproof board away from the geotextile, a deformation joint is opened in the lining layer, and the deformation joint is sequentially provided with spaced back-sticking waterstop strips and embedded waterstop strips in the direction away from the waterproof board, the back-sticking waterstop strip is provided with a back-sticking side, and the back-sticking side is connected to the surface of the waterproof board, the deformation joint is separated into a first seam body and a second seam body by the embedded waterstop strip, the first seam body is filled with a first filler, and the second seam body is filled with a second filler.

[0006] Furthermore, the first filler includes asphalt cork board.

[0007] Furthermore, the second filler includes hemp asphalt and polysulfide two-component sealing paste, and the hemp asphalt and the polysulfide two-component sealing paste are arranged in sequence on one side of the second seam away from the embedded waterstop.

[0008] Furthermore, the above-mentioned back-sticking waterstop strip is in the shape of an isosceles trapezoid, and one side of the upper bottom edge of the above-mentioned back-sticking waterstop strip is the above-mentioned back-sticking side.

[0009] Furthermore, straightening steel bars are arranged transversely around the outer side of the above-mentioned embedded waterstop.

[0010] Furthermore, the non-woven geotextile is evenly spaced and provided with a plurality of groups of hot-melt gaskets and nails for fixing the non-woven geotextile to the concrete spraying layer.

[0011] The beneficial effects of the utility model are:

[0012] The combination of non-woven geotextile + waterproof board + back-sticked waterstop + embedded waterstop can effectively improve the waterproof effect of the overall structure, and by filling the first filler and the second filler with waterproof effect, it can ensure that the waterproof performance of the structure is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of the utility model Figure 1 ;

[0014] Figure 2 This is a schematic diagram of the structure of the utility model Figure 2 ;

[0015] Figure 3 This is a schematic diagram of the structure of the back-sticking water stop belt of the utility model;

[0016] Figure 4 This is a schematic diagram of the structure of the buried water stop belt of the utility model;

[0017] Marked in the figure are, 1-non-woven geotextile, 2-waterproof board, 3-back-attached waterstop, 4-buried waterstop, 5-lining layer, 6-concrete spraying layer, 7-asphalt cork board, 8-hemp asphalt, 9-polysulfide two-component sealing paste, 10-straightening steel bar, 11-drainage hole, 12-waterstop rib. DETAILED DESCRIPTION

[0018] The utility model is further described below in conjunction with the accompanying drawings.

[0019] according to Figure 1 , Figure 2 As shown, an embodiment of the present application proposes a double-lining waterproof structure for deformation joints in water-rich areas of a tunnel, comprising a concrete spraying layer 6, a non-woven geotextile 1 is arranged on the outer side of the concrete spraying layer 6, a waterproof board 2 is arranged on the side of the non-woven geotextile 1 away from the concrete spraying layer 6, a lining layer 5 is arranged on the side of the waterproof board 2 away from the geotextile, a deformation joint is opened in the lining layer 5, and the deformation joint is sequentially provided with spaced back-sticking waterstop strips 3 and embedded waterstop strips 4 in the direction away from the waterproof board 2, the back-sticking waterstop strip 3 is provided with a back-sticking side, and the back-sticking side is connected to the surface of the waterproof board 2, the deformation joint is separated into a first seam body and a second seam body by the embedded waterstop strip 4, the first seam body is filled with a first filler, and the second seam body is filled with a second filler.

[0020] It should be noted that the above-mentioned concrete spraying layer 6 is sprayed on the inner wall of the tunnel. Regarding the laying of the non-woven geotextile 1, specifically, when the initial support of the tunnel is completed and the deformation reaches a basic stability, the non-woven geotextile 1 is laid. First, a single non-woven geotextile 1 is fixed to a predetermined position with an operating trolley, and then the non-woven geotextile 1 is fixed with a hot-melt gasket and nails, and fixed from bottom to top in a circular manner. The overlap width of the non-woven geotextile 1 is not less than 50 mm. Among them, the hot-melt pads and nails are arranged in a plum blossom shape, and the non-woven geotextile 1 is closely attached to the surface of the sprayed concrete. The laying should be smooth, without bulges and wrinkles. After installation, check whether the hot-melt gasket is intact to determine whether it can meet the installation requirements of the waterproof board 2. If it does not meet the requirements, the hot-melt gasket needs to be nailed. By laying the non-woven geotextile 1, the waterproof board 2 can be effectively protected from being pierced by sharp stones and burrs, and defects such as leakage can be avoided.

[0021] For the above-mentioned waterproof board 2, fix the waterproof board 2 to a predetermined position, and then heat it with a manual electric hot melt welding device. A heat-insulating cloth cushion is used between the electric hot melt welding device and the waterproof board 2 to prevent damage to the waterproof board 2 during heating. The waterproof board 2 is welded on a special hot melt gasket that fixes the non-woven fabric. The circumferential seam of the waterproof board 2 is welded by an automatic double-seam waterproof board 2 climbing welding machine at a predetermined temperature and speed. After welding, there is an air passage between the two seams, and the welding quality is detected by an air detector. Before welding, remove all dust on the surface of the waterproof board 2 and then weld to ensure the density of the seam.

[0022] according to Figure 3 , Figure 4 As shown, the back-attached waterstop 3 and the embedded waterstop 4 both include waterstop ribs 12 and drainage holes 11, which have a directional drainage effect while ensuring the sealing and water-stopping effect. For the back-attached waterstop 3, the upper waterstop is fixed to the waterproof board 2 by a rod, the lower end of the waterstop is inserted into the reserved installation groove, and the drainage hole 11 of the back-attached waterstop 3 is connected to the corrugated drainage pipe at the bottom. Then it is fixed and implanted in the installation groove with waterproof concrete. After the lining concrete construction is completed, there is no joint in the middle of each waterstop, and each circumferential construction joint has a drainage hole 11 leading to the tunnel drainage system. The back-attached drainage belt is a drainable composite rubber waterstop. The waterstop material has good elasticity, wear resistance, aging resistance and tear resistance, strong deformation adaptability and good waterproof performance. The rubber stop uses the high elasticity of rubber to produce elastic deformation under various loads, thereby playing a solid seal, effectively preventing leakage and seepage of the tunnel secondary lining and playing a shock-absorbing and buffering role.

[0023] In addition, the above-mentioned back-sticking waterstop strip 3 is shaped like an isosceles trapezoid, and one side of the upper bottom edge of the above-mentioned back-sticking waterstop strip 3 is the above-mentioned back-sticking side. The waterstop strip with this structure and shape is easy to construct and the obliquely extending waterstop rib 12 has a better water-stopping effect.

[0024] The above-mentioned embedded waterstop 4 has waterstop ribs 12 on both sides located in the lining layer 5, and the direction of the drainage hole 11 is perpendicular to the extension direction of the deformation joint. The specific installation process is to accurately and stably build the embedded waterstop 4 in the lining layer 5 by molding the two sides of the deformation joint in two steps to form the two sides of the lining layer 5. In addition, the outer side of the above-mentioned embedded waterstop 4 is transversely surrounded by straightening steel bars 10, which can ensure that the waterstop ribs 12 on both sides of the embedded waterstop 4 are kept perpendicular to the inner wall of the deformation joint after construction, and maintain a stable posture.

[0025] Regarding the filling structure of the expansion joint, the first filler includes an asphalt cork board 7, and the second filler includes hemp asphalt 8 and a polysulfide two-component sealant 9. The hemp asphalt 8 and the polysulfide two-component sealant 9 are arranged sequentially on one side of the second seam away from the embedded waterstop 4, and the hemp asphalt 8 and the polysulfide two-component sealant 9 are both in an extruded and smoothed state, which can ensure better waterproof function.

[0026] In summary, the utility model proposes a double-lining waterproof structure for deformation joints in water-rich areas of tunnels, including a concrete spraying layer 6, a non-woven geotextile 1 is arranged on the outside of the concrete spraying layer 6, a waterproof board 2 is arranged on the side of the non-woven geotextile 1 away from the concrete spraying layer 6, a lining layer 5 is arranged on the side of the waterproof board 2 away from the geotextile, and a deformation joint is opened in the lining layer 5. The deformation joint is sequentially provided with spaced back-sticking waterstops 3 and embedded waterstops 4 in the direction away from the waterproof board 2. The back-sticking waterstop 3 is provided with a back-sticking side, which is connected to the surface of the waterproof board 2. The deformation joint is divided into a first seam body and a second seam body by the embedded waterstop 4. The first seam body is filled with a first filler, and the second seam body is filled with a second filler. The non-woven geotextile 1 + waterproof board 2 are bonded to form an integral parallel waterproof system, which can prevent groundwater from flowing and serves as the first line of defense against water seepage and leakage in the deformation joint. The drainage hole 11 in the middle of the trapezoidal back-sticking water stop 3 is connected to the corrugated drainage pipe at the bottom, which greatly increases the waterproof and drainage effect of the secondary lining. The hemp asphalt 8 and polysulfide two-component sealing paste are used to seal the deformation joint, which has strong durability and high filling self-compactness. This structure is used to treat the deformation joint of the tunnel in the water-rich area, with simple operation, fast progress, low cost and good waterproof effect.

Claims

1. The secondary lining waterproof structure of the deformation joint in the water-rich area of ​​the tunnel is characterized by: The invention comprises a concrete spraying layer (6), a non-woven geotextile (1) is arranged outside the concrete spraying layer (6), a waterproof board (2) is arranged on the side of the non-woven geotextile (1) away from the concrete spraying layer (6), a lining layer (5) is arranged on the side of the waterproof board (2) away from the geotextile, a deformation joint is opened in the lining layer (5), and the deformation joint is provided with a back-attached waterstop (3) and a buried waterstop (4) spaced apart from each other in sequence in the direction away from the waterproof board (2), the back-attached waterstop (3) is provided with a back-attached side, and the back-attached side is connected to the surface of the waterproof board (2), the deformation joint is divided into a first joint body and a second joint body by the buried waterstop (4), the first joint body is filled with a first filler, and the second joint body is filled with a second filler.

2. The tunnel water-rich area deformation joint secondary lining waterproof structure according to claim 1 is characterized in that: The first filling material comprises asphalt cork board (7).

3. The tunnel water-rich area deformation joint secondary lining waterproof structure according to claim 2 is characterized in that: The second filler comprises hemp asphalt (8) and polysulfide two-component sealing paste (9), and the hemp asphalt (8) and the polysulfide two-component sealing paste (9) are arranged in sequence on the side of the second seam away from the embedded waterstop (4).

4. The tunnel water-rich area deformation joint secondary lining waterproof structure according to claim 1 is characterized in that: The back-sticking water stop strip (3) is in the shape of an isosceles trapezoid, and one side of the upper bottom edge of the back-sticking water stop strip (3) is the back-sticking side.

5. The tunnel water-rich area deformation joint secondary lining waterproof structure according to claim 1 is characterized in that: A straightening steel bar (10) is disposed transversely around the outer side of the embedded water stop strip (4).

6. The tunnel water-rich area deformation joint secondary lining waterproof structure according to claim 1 is characterized in that: The non-woven geotextile (1) is evenly spaced with a plurality of groups of hot-melt gaskets and nails for fixing the non-woven geotextile (1) to the concrete spraying layer (6).

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