Wide-hole-pitch three-pipe-method high-spraying diaphragm wall

Abstract

The utility model provides a wide-pitch three-pipe method high-pressure jet diaphragm wall, the diaphragm wall is formed by adopting a three-pipe method high-pressure jet and is used for carrying out anti-seepage reinforcement on a reservoir dam foundation, a water delivery hole is arranged below a reservoir riding track, in order to ensure the normal work of the water delivery hole, a wide-pitch drill hole is arranged on the riding track, and the water delivery hole is communicated with the water delivery hole. The jet grouting piles and the swing grouting piles are sequentially connected to form an anti-seepage wall structure, alternative lifting operation can be selected during jet grouting and swing grouting construction, the overall strength and working performance of the jet grouting piles and the swing grouting piles are improved, and the anti-seepage wall is stable in structure, good in stress performance and easy to construct.

Description

Technical field:

[0001] The utility model relates to the field of water conservancy projects, in particular to a wide-hole-distance three-tube method high-pressure spraying anti-seepage wall. Background technology:

[0002] Cut-off wall is a common form of reinforced anti-seepage structure in water conservancy projects. The seepage length of water flow can be extended, the uplift pressure of the structure can be reduced, and the stability of the structure can be increased through the cut-off wall. Therefore, it has been widely used in buildings such as dams and levees. There are many methods for the construction of cut-off walls. The common ones are conventional concrete cut-off wall construction, high-pressure spraying cut-off wall construction, and rotary spraying cut-off wall construction. However, the applicable conditions of these construction methods are limited, especially for conventional high-pressure spraying cut-off walls, which have strict requirements on the drilling hole spacing, and it is difficult to meet the requirements for the construction of cut-off walls with larger hole spacing.

[0003] For the construction of anti-seepage walls at reservoir dam foundations, it is necessary to overcome the influence of existing buildings during the risk removal and reinforcement operations. Under the condition of ensuring the normal operation of existing buildings, drilling and high-pressure spraying construction needs to form a wide hole spacing. Conventional high-pressure spraying construction cannot meet the requirements, or although it can be constructed, the integrity of the anti-seepage wall cannot be effectively guaranteed. Utility model content:

[0004] In view of the problems of the prior art, the utility model provides a wide-hole-spacing three-tube method high-pressure spraying anti-seepage wall, which realizes the anti-seepage wall structure setting under the wide hole spacing and ensures the structural stability and integrity of the anti-seepage wall.

[0005] The utility model provides a wide-hole-spacing three-tube high-pressure jetting anti-seepage wall, which is located in a reservoir and is used for anti-seepage reinforcement of a dam foundation of the reservoir. The anti-seepage wall is formed by three-tube high-pressure jetting, and the reservoir comprises a dam, a horseway, a dam foundation and a water diversion tunnel. The utility model is characterized in that the top of the anti-seepage wall is located on the horseway of the reservoir, a water diversion tunnel is arranged below the horseway, the water diversion tunnel comprises a mortar-laid stone gallery, the anti-seepage wall comprises rotary jetting piles and swing jetting piles, boreholes are arranged on the horseway, the boreholes at the water diversion tunnel position are respectively located on both sides of the water diversion tunnel to form boreholes with a wide hole spacing, the wide hole spacing is greater than the width of the water diversion tunnel, the rotary jetting piles are generated by rotary jetting operation through the boreholes of the horseway, the swing jetting piles are generated by swing jetting operation through the boreholes of the horseway, the rotary jetting piles and the swing jetting piles are connected in sequence to form an anti-seepage wall structure.

[0006] Preferably, the anti-seepage wall is formed by drilling holes on the horseway and then performing rotary spraying and swing spraying alternatingly in the drilled holes to form an anti-seepage wall structure. The rotary spraying and swing spraying alternatingly lifting operations are as follows: first, the lower shotcrete pipe is rotary sprayed to lift a set distance and then stop spraying, then the lower shotcrete pipe is swing sprayed to lift to a set distance and then stop spraying, and the rotary spraying and swing spraying alternatingly lifting operations are repeated until the top elevation of the anti-seepage wall is reached.

[0007] Preferably, when rotary spraying again, overlap with the last rotary spraying by 0.4m for re-spraying, and when swing spraying again, overlap with the last swing spraying by 0.4m for re-spraying.

[0008] Preferably, the set distance is 5m.

[0009] Preferably, the hole spacing of the wide hole spacing is not less than 2.5m.

[0010] The working principle of the utility model is as follows:

[0011] For the dam foundation of a reservoir with a water diversion tunnel, in order to ensure the normal operation of the water diversion tunnel, the drilling hole spacing is expanded to form a wide hole spacing operation. The alternating lifting method of "large-aperture pilot hole rotary spraying → small-angle swing spraying → repeated spraying" can be used to increase the hole spacing from the conventional 1.0-1.4m to a wide hole spacing operation. At the same time, the problem of substandard wall thickness near the grouting holes of the anti-seepage wall in small-angle swing spraying (less than 30°) is solved. The combination of rotary spraying piles and swing spraying piles is used to ensure the integrity and stability of the anti-seepage wall under wide hole spacing, minimizing the disturbance and damage to the surrounding environment.

[0012] The advantages of the utility model are:

[0013] The utility model provides a wide-hole-spacing three-tube method high-pressure jetting anti-seepage wall, which is formed by three-tube method high-pressure jetting and is used for anti-seepage reinforcement of reservoir dam foundation. A water diversion tunnel is arranged under the horseway of the reservoir. In order to ensure the normal operation of the water diversion tunnel, wide-hole-spacing drill holes are opened on the horseway, and then rotary jet piles and swing jet piles are constructed by using the drill holes. The rotary jet piles and swing jet piles are connected in sequence to form an anti-seepage wall structure. During the rotary jet and swing jet construction, alternate lifting operations can be selected to improve the overall strength and working performance of the rotary jet piles and swing jet piles. The anti-seepage wall has a stable structure, good force-bearing performance and is easy to construct. Description of the drawings:

[0014] Figure 1 This is a schematic diagram of the location of the water tunnel, horse trail and borehole;

[0015] Figure 2 Schematic diagram of the anti-seepage wall structure. Specific implementation method:

[0016] The following is a detailed explanation of the contents defined in the present utility model.

[0017] The utility model provides a wide-hole-spacing three-tube method high-pressure jetting anti-seepage wall, the anti-seepage wall is located in a reservoir and is used for anti-seepage reinforcement of a dam foundation of the reservoir, the anti-seepage wall is formed by three-tube method high-pressure jetting, the reservoir comprises a dam, a horseway 1, a dam foundation and a water delivery tunnel 2, and is characterized in that: the top of the anti-seepage wall is located on the horseway 1 of the reservoir, a water delivery tunnel 2 is arranged below the horseway 1, the water delivery tunnel 2 comprises a mortar-laid stone gallery, the anti-seepage wall comprises rotary jetting piles 4 and swing jetting piles 5, boreholes 3 are arranged on the horseway 1, the boreholes 3 at the position of the water delivery tunnel 2 are respectively located on both sides of the water delivery tunnel 2 to form the boreholes 3 with a wide hole spacing, the wide hole spacing is greater than the width of the water delivery tunnel 2, the rotary jetting piles 4 are generated by rotary jetting operation through the boreholes 3 of the horseway 1, the swing jetting piles 5 are generated by swing jetting operation through the boreholes 3 of the horseway 1, the rotary jetting piles 4 and the swing jetting piles 5 are connected in sequence to form an anti-seepage wall structure.

[0018] Preferably, when the water transfer tunnel 2 is circular, the wide hole spacing is greater than the diameter of the water transfer tunnel 2. The wide hole spacing is such that the drill holes 3 are located on both sides of the water transfer tunnel 2. During operation, the construction of the anti-seepage wall does not affect the normal operation of the water transfer tunnel 2.

[0019] Preferably, the anti-seepage wall is formed by drilling a hole 3 on the horseway 1 and then performing rotary spraying and swing spraying alternatingly in the drilled hole 3 to form an anti-seepage wall structure. The rotary spraying and swing spraying alternatingly lifting operation is to first lift the grouting pipe by rotary spraying for a set distance and then stop spraying. Then, the lower shotcrete pipe swing spraying is lifted to a set distance and then stop spraying. The rotary spraying and swing spraying alternatingly lifting operation is repeated until the top elevation of the anti-seepage wall is reached.

[0020] Preferably, when rotary spraying again, overlap with the last rotary spraying by 0.4m for re-spraying, and when swing spraying again, overlap with the last swing spraying by 0.4m for re-spraying.

[0021] Preferably, the set distance is 5m. The set distance can be adjusted according to the depth of the borehole 3, and the lifting speed of the rotary grouting and swing grouting is preferably controlled at 3cm / min. During the cyclic lifting, the starting working surface and the stopping working surface of the rotary grouting and swing grouting are also at the same depth.

[0022] Preferably, the hole spacing of the wide hole spacing is not less than 2.5m. The horizontal position deviation of the borehole 3 during drilling does not exceed 5cm, the verticality is controlled at 1% of the depth of the borehole 3, and the depth of the borehole 3 exceeds the wall depth of the anti-seepage wall 1 by not less than 0.3m.

[0023] The specific gravity of the cement slurry for the oscillating spraying is 1.4 g / cm 3 , water pressure is 35-40MPa, air pressure is 0.8-1.2Mpa, swing spray angle is 30°, swing speed is 12 times / min. The parameters of the rotary spraying should be reasonably determined according to the test.

[0024] The above-mentioned embodiments are only preferred embodiments of the present invention. The protection scope of the present invention should not be regarded as limited to the specific forms described in the embodiments. The protection scope of the present invention also includes equivalent technical means that can be thought of by those skilled in the art based on the concept of the present invention.

Claims

1. A wide-hole-spacing three-tube high-pressure jetting anti-seepage wall, the anti-seepage wall is located in a reservoir and is used to reinforce the reservoir dam foundation. The anti-seepage wall is formed by three-tube high-pressure jetting. The reservoir includes a dam, a horseway, a dam foundation and a water transfer tunnel, and is characterized by: The top of the anti-seepage wall is located on the horseway of the reservoir, and a water diversion tunnel is arranged below the horseway. The water diversion tunnel includes a mortar-laid stone corridor. The anti-seepage wall includes rotary jet piles and swing jet piles. Drill holes are arranged on the horseway. The drill holes at the position of the water diversion tunnel are respectively located on both sides of the water diversion tunnel to form drill holes with a wide hole spacing, and the wide hole spacing is greater than the width of the water diversion tunnel. The rotary jet piles are generated by rotary jetting operations through the drill holes in the horseway, and the swing jet piles are generated by swing jetting operations through the drill holes in the horseway. The rotary jet piles and the swing jet piles are connected in sequence to form an anti-seepage wall structure.

2. The wide-hole-spacing three-tube high-pressure spraying anti-seepage wall according to claim 1, characterized in that: The anti-seepage wall is formed by drilling holes on the horseway and then performing rotary spraying and swing spraying alternatingly in the drilled holes to form an anti-seepage wall structure. The rotary spraying and swing spraying alternatingly lifting operations are as follows: firstly, the spraying pipe is lowered for rotary spraying to lift a set distance and then the spraying is stopped. Then, the spraying pipe is lowered for swing spraying to lift a set distance and then the spraying is stopped. The rotary spraying and swing spraying alternatingly lifting operations are repeated until the top elevation of the anti-seepage wall is reached.

3. The wide-hole-spacing three-tube high-pressure spraying anti-seepage wall according to claim 2, characterized in that: When spraying again by rotary spraying, overlap it with the last time by 0.4m for spraying again. When spraying again by swing spraying, overlap it with the last time by 0.4m for spraying again.

4. The wide-hole-spacing three-tube high-pressure spraying anti-seepage wall according to claim 2, characterized in that: The set distance is 5m.

5. The wide-hole-spacing three-tube high-pressure spraying anti-seepage wall according to claim 1, characterized in that: The hole spacing of the wide hole spacing is not less than 2.5m.

Images