CN103741695A - Embedded grouting pipe installed on waterstop and grouting method - Google Patents

Abstract

The invention relates to the field of waterproof facilities for immersed tubes in subsea tunnels, in particular to a pre-embedded grouting pipe installed on a water stop between immersed tubes and a grouting method. The pre-embedded grouting pipe includes a grouting pipe body , sponge rubber and connecting screw, the sponge rubber is arranged at both ends of the waterstop, and the connecting screw passes through the grouting pipe body and the sponge rubber in turn, so that the lower port of the grouting pipe body and the sponge rubber Snug connection. The pre-embedded grouting pipe provided by the present invention can make the sponge rubber form a grouting groove on the waterstop after grouting, and all cracks and defect points around the waterstop will be filled with grouting fluid, thereby completely preventing The immersed tube leaks, so that after the grouting operation is completed, all possible water leakage will be completely sealed, eliminating the potential safety hazard of the immersed tube; the grouting tube provided by the invention is easy and fast to install and operate.

Description

Pre-embedded grouting pipe installed on waterstop and grouting method

technical field

The invention relates to the field of waterproof facilities for subsea tunnel immersed tubes, in particular to a pre-embedded grouting pipe installed on a water stop between immersed tubes and a grouting method.

Background technique

When there is water pressure outside the joints between concrete segments, such as tunnels, cellars, offshore oil fields, etc., waterstops are required at the joints to maintain good watertightness. Standard rubber waterstops with vulcanized steel bands are usually available. The waterstop has good watertightness. In practice, however, due to shrinkage of the concrete and inadequate vibrating of the pour, the concrete along the perimeter of the waterstop will develop cracks, pockmarks or similar defects that may allow water to seep into the concrete.

In the subsea tunnel immersed tube prefabrication, each standard immersed tube section is about 180m long, and can be prefabricated by up to 8 sections in sequence, each section is 22.5m long, 37.95m wide, and 11.4m high. A mid-buried groutable waterstop is used between the concrete of the pipe section as the first waterproofing facility. Waterstops are mostly made of steel plate waterstops, which are mainly installed at the construction joints between the tunnel immersed tubes to increase the joint area of the two concrete constructions, mainly to meet the waterproof requirements of the construction joints, and should be folded and snapped according to their thickness. or lap.

During the concrete construction process of the pipe joint, due to the lack of compactness of the vibrating operation and the shrinkage of the concrete itself, the gap between the groutable water stop and the concrete may not be dense, and there are water seepage channels. In the later stage of the tunnel project, after sinking the immersed tube joints on the seabed, under the condition of strong water pressure on the seabed, water will enter along these seepage channels, resulting in water seepage of the immersed tube joints, and in severe cases, the joints may leak. Make the subsea tunnel appear safety hazard.

In order to solve the above problems, the present invention makes beneficial improvements.

Contents of the invention

(1) Technical problems to be solved

The purpose of the present invention is to provide a grouting pipe installed on the water stop between immersed tubes and its grouting method, which can seal the water seepage channel generated between the grouting water stop and the concrete, and prevent the immersed tube joint water leakage.

(2) Technical solution

The present invention is achieved through the following technical solutions: a pre-embedded grouting pipe installed on a waterstop, the pre-embedded grouting pipe includes a grouting pipe body, a sponge rubber and a connecting screw, the sponge rubber is set At both ends of the waterstop, the connecting screw passes through the grouting pipe body and the sponge rubber in sequence, so that the lower port of the grouting pipe body is tightly connected to the sponge rubber.

Wherein, the sponge rubber is provided with a through hole, and the underside of the sponge rubber is provided with a U-shaped pulp inlet steel cover, and the connecting screw passes through the through hole and is threadedly connected with the U-shaped pulp inlet steel cover. , so that the U-shaped pulp inlet steel cover is close to the sponge rubber.

Further, a rubber water stop ring is provided between the sponge rubber and the lower port of the grouting pipe body, and the rubber water stop ring is sleeved on the connecting screw.

Still further, the contact surfaces of the steel cover of the U-shaped stock inlet, the rubber waterstop ring and the sponge rubber are respectively coated with water-expandable waterstop glue.

Preferably, the connecting lead screw is connected with a limit nut at the upper port position of the grouting pipe body.

Further, a ring of water-swellable water-stop glue is applied to the middle of the outer wall of the grouting pipe.

Preferably, the upper end of the connecting screw is provided with a pull ring.

Wherein, the upper end of the connecting screw is sheathed with a protective tube, and the protective tube is filled with plastic foam or rags, and both ports of the protective tube are connected with sealing tapes.

Preferably, the protective pipe is hard polyvinyl chloride PVC pipe and polyethylene plastic PE pipe.

The present invention also provides a grouting method using the above-mentioned pre-embedded grouting pipe installed on the waterstop, comprising the following steps:

S1 Take out the connecting screw from the body of the grouting pipe;

S2 injects grout into the concrete around the waterstop through the grouting pipe, and the sponge rubber on the waterstop is compressed, so that the sponge rubber forms a grouting groove on the waterstop.

(3) Beneficial effects

Compared with prior art and product, the present invention has following advantage:

1. The pre-embedded grouting pipe provided by the present invention can make the sponge rubber form a grouting groove on the waterstop after grouting, and all cracks and defect points around the waterstop will be filled with grouting fluid, thereby It can completely prevent water leakage, so that after the grouting operation is completed, all possible water leakage will be completely sealed, eliminating the safety hazard of immersed pipes;

2. The installation and grouting operation of the grouting pipe provided by the present invention are simple and quick.

Description of drawings

Fig. 1 is the connection structure figure that the present invention provides embedded grouting pipe;

Fig. 2 is a structural diagram of a steel plate waterstop provided by the present invention;

Fig. 3 is a structural view of the U-shaped slurry inlet steel cover provided by the present invention.

In the accompanying drawings, the components represented by each label are listed as follows:

1. Limit nut; 2. Connecting screw; 3. Pull ring; 4. Sealing tape; 5. Protective tube; 6. Filler; 7. Grouting pipe body; 1. Rubber waterstop ring; 10. Steel plate waterstop; 11. Steel cover for U-shaped pulp inlet; 12. Sponge rubber.

Detailed ways

The specific implementation manner of the present invention will be described in detail below in conjunction with the accompanying drawings.

As shown in Figure 1, this embodiment provides a pre-embedded grouting pipe installed on a waterstop, the pre-embedded grouting pipe includes a grouting pipe body 7, a sponge rubber 12 and a connecting screw 2, the The sponge rubber 12 is arranged at both ends of the steel plate waterstop 10, and the connecting screw passes through the grouting pipe body and the sponge rubber in turn, so that the lower port of the grouting pipe body is closely connected with the sponge rubber. In order to prevent water leakage, it is usually necessary to bury a grouting pipe between the waterstop and the concrete so that its defects can be repaired later. In the prefabrication of tunnel immersed tubes, the structure of the steel plate waterstop can be used. As shown in FIG. 2 , the steel strips at both ends of the steel plate waterstop 10 are embedded with sponge rubber 12 . Of course, the waterstop is not limited to the steel plate waterstop, and other types of waterstops can also be applied as long as they meet the structural requirements of the grouting pipe. The pipe body of the grouting pipe preferably adopts a steel pipe with an outer diameter of 16mm, and is connected with a sponge rubber not greater than 4m long. The sponge rubber can adopt neoprene sponge rubber. After the concrete has cured and all shrinkage has occurred, the grout is injected through the grouting pipe. Since the grouting pressure is 0.5-1.0Mpa, the sponge rubber in the waterstop is compressed, forming a grouting groove in the steel plate waterstop. All cracks and imperfections along the grooves will be filled with grout, completely stopping water leaks. After all the grouting work is done, all possible water leaks will be completely sealed. The grouting pipe should be firmly fixed to prevent bending and displacement during concrete pouring. Before the connecting screw rod penetrates the grouting pipe body, apply a small amount of petrolatum or solid grease on the surface of the connecting screw rod to prevent the connecting screw rod from being unable to be pulled out from the grouting pipe body after the concrete grouting pipe is injected.

Specifically, the sponge rubber is provided with a through hole, and the inner diameter of the through hole should be correspondingly the same as the outer diameter of the above-mentioned connecting screw. As shown in Fig. 1 and Fig. 3, the U-shaped slurry inlet steel cover 12 is arranged on the underside of the sponge rubber, and the connecting screw passes through the through hole and is threadedly connected with the U-shaped slurry inlet steel cover, so that the U-shaped slurry inlet steel cover 12 is threaded. The steel cover of the type stock inlet is close to the sponge rubber. Further, a rubber waterstop ring can also be provided between the sponge rubber and the lower port of the grouting pipe body, and the rubber waterstop ring is sleeved on the connecting screw and is closely attached to the upper surface of the sponge rubber to play a role of sealing. The effect of stopping water. The contact surface between the steel cover of the U-shaped grout inlet or the rubber water-stop ring and the sponge rubber is coated with water-expandable water-stop glue to prevent the grout from entering the grouting pipe. Moreover, a ring of water-expandable water-stopping glue 8 can also be applied on the middle position of the outer wall of the grouting pipe to close the possible water seepage channel formed between the outer wall of the grouting pipe and the concrete.

In addition, the connection lead screw is connected with a limit nut 1 at the upper port of the grouting pipe body, and the limit nut is tightened to make the grouting pipe body and the rubber stopper connected in series between the connection screw rods The water ring, sponge rubber and U-shaped grout inlet steel cover are closely attached to each other, which has achieved the function that concrete grout cannot enter the grouting pipe from its joints.

Further, the upper end of the connecting screw is provided with a pull ring 3 . Wherein, the connecting lead screw can adopt ring screw, and the ring screw is penetrated into the body of the grouting pipe.

The upper end of the grouting pipe can directly expose the concrete surface by 50-100 mm. When the concrete surface cannot be exposed (such as formwork blocking), it can be exposed by opening holes, or the upper end of the grouting pipe is fixed with a protective pipe 5 . The protective pipe can use a small piece of hard polyvinyl chloride PVC or polyethylene plastic PE pipe with an inner diameter of 60-100mm, and fill the protective pipe with filler 6, which is plastic foam or rags, and is used to block the end of the grouting pipe , the two ends of the PVC or PE pipe are sealed with sealing tape 4 and fixed on the formwork surface (ie the concrete surface) to prevent concrete from entering, so as not to block the grouting pipe. The length of the grouting pipe and the connecting screw should be determined before installation. After installation, the distance between the limit nut and the pull ring should not be too large, preferably 5-20mm, and the length of the exposed concrete at the outlet of the grouting pipe should be controlled at 50-100mm , when the concrete does not leak out, it should be ensured that the plugging end of the grouting pipe is on the concrete surface. After the concrete pouring is completed, the screw rod is unscrewed and pulled out before the grouting of the waterstop, and the grouting work can be carried out.

This embodiment also provides a grouting method using the above-mentioned pre-embedded grouting pipe installed on the waterstop, comprising the following steps:

S1 Take out the connecting screw from the body of the grouting pipe; if the concrete surface is not exposed at the port of the grouting pipe, mark the position of the grouting pipe. When in use, the protective pipe can be chiseled out from the concrete. The inspection of the grouting pipe should be done well before concrete pouring, and records should be kept on file. During the pouring process, attention should be paid to the vibration work at the grouting pipe to prevent the grouting pipe from being damaged. After the initial setting of the concrete, for the grouting pipe exposed on the concrete surface, the connecting screw can be rotated and pulled out to check whether the grout has entered, and the treatment should be carried out in advance to ensure that the connecting screw can be pulled out smoothly in the later stage.

S2 injects grout into the concrete around the waterstop through the grouting pipe, and the sponge rubber on the waterstop is compressed, so that the sponge rubber forms a grouting groove on the waterstop.

The above embodiments are only used to illustrate the present invention, but not to limit the present invention. Those of ordinary skill in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all Equivalent technical solutions also belong to the category of the present invention, and the scope of patent protection of the present invention should be defined by the claims.

Claims (10)

1. the built-in slip casting pipe being arranged on waterstop, it is characterized in that, this built-in slip casting pipe comprises Grouting Pipe body, sponge rubber and connection leading screw, described sponge rubber is arranged on waterstop two ends, described connection leading screw through described Grouting Pipe body and sponge rubber, makes Grouting Pipe body lower port be close to and be connected with sponge rubber successively.

2. the built-in slip casting pipe being arranged on waterstop according to claim 1, it is characterized in that, described sponge rubber is provided with a through hole, and this sponge rubber downside is provided with U-shaped stock inlet steel cage, described connection leading screw passes described through hole and is threaded with U-shaped stock inlet steel cage, makes U-shaped stock inlet steel cage be close to sponge rubber.

3. the built-in slip casting pipe being arranged on waterstop according to claim 2, is characterized in that, between described sponge rubber and Grouting Pipe body lower port, is also provided with rubber O-ring seal, and this rubber O-ring seal is sleeved on described connection leading screw.

4. the built-in slip casting pipe being arranged on waterstop according to claim 3, is characterized in that, the contact surface of described U-shaped stock inlet steel cage and rubber O-ring seal and sponge rubber scribbles respectively water-swellable sealing glue.

5. the built-in slip casting pipe being arranged on waterstop according to claim 1, is characterized in that, on described connection leading screw, in described Grouting Pipe body upper port position, is connected with stop nut.

6. the built-in slip casting pipe being arranged on waterstop according to claim 1, is characterized in that, described Grouting Pipe tube wall centre position is coated with a circle water-swellable sealing glue.

7. the built-in slip casting pipe being arranged on waterstop according to claim 1, is characterized in that, the upper end of described connection leading screw is provided with draw ring.

8. the built-in slip casting pipe being arranged on waterstop according to claim 1, it is characterized in that, the upper end outer cover of described connection leading screw is provided with protecting tube, be filled with plastic foam or cloth waste, and the two-port of this protecting tube is all connected with Sealing strap in described protecting tube pipe.

9. the built-in slip casting pipe being arranged on waterstop according to claim 8, is characterized in that, described protecting tube is rigid polyvinyl chloride pvc pipe and vinyon PE pipe.

10. the grouting method that be arranged on built-in slip casting pipe waterstop on of employing as described in claim 1-9 any one, is characterized in that, comprises the following steps:

S1 will connect leading screw and take out in Grouting Pipe body;

S2 injects slurry by Grouting Pipe in waterstop concrete around, and the sponge rubber on described waterstop is compressed, thereby makes this sponge rubber on waterstop, form slip casting groove.

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