CN218759925U - Secondary grouting hole structure - Google Patents

Abstract

The utility model discloses a secondary slip casting pore structure, pre-buried screwed pipe (4) top install stopper (3), slip casting spiral pipe (5) are installed to the bottom, pre-buried screwed pipe (4) one end install check valve (1), check valve (1) be located between pre-buried screwed pipe (4) and slip casting spiral pipe (5), pre-buried screwed pipe (4) in perfuse slurry coagulation piece (8), slip casting spiral pipe (5) bottom install sealing washer (6) and slip casting stopcock (7). The anti-seepage water-stop plastic cover overcomes the defects that the adhesive property of a grout block and the wall of a concrete pipe is weakened along with the increase of the operating years of a tunnel, the plastic cover can be corroded and fall off after being used for a long time, high external water pressure is difficult to bear, finally disasters such as water leakage and sand gushing of a secondary grouting hole can occur, and the anti-seepage water-stop plastic cover has the advantages that the secondary grouting hole can provide seepage prevention and water stop by virtue of the adhesive friction between the grout condensation block 8 and the embedded threaded pipe 4.

Description

Secondary grouting hole structure

Technical Field

The utility model relates to civil engineering shield tunnel's technical field, concretely relates to secondary slip casting pore structure.

Background

In the shield tunnel tunneling construction process, the gaps between shield segments and surrounding rocks are generally filled with slurry in a synchronous grouting mode, when the synchronous grouting has poor effect of plugging the gaps around the segments, so that the stratum is too large in sedimentation or the water seepage of the segments is serious, secondary grouting is carried out through reserved grouting holes in the segments to fill the gaps, and the purposes of controlling the stratum sedimentation and plugging seepage are achieved.

After the secondary grouting is finished, the secondary grouting holes in the segments need to be plugged, so that the phenomenon that the secondary grouting holes leak water in the construction period and the operation period to influence the normal use of the shield tunnel is avoided. At present, the conventional plugging of the secondary grouting hole depends on the friction between a slurry block condensed in a straight pipe in the hole and a pipe wall, and the end part of the secondary grouting hole is plugged by a plastic blank cap. However, as the number of years of tunnel operation increases, the adhesion between the grout blocks and the concrete pipe wall is weakened, and the plastic blank cap is corroded and falls off even after being used for a long time, so that the plastic blank cap is difficult to bear high external water pressure, and finally disasters such as water leakage and sand gushing of a secondary grouting hole can occur.

A structure is therefore required to solve the above problems.

Disclosure of Invention

The utility model aims to overcome the defects of the background art and provides a secondary grouting hole structure.

The utility model aims at being implemented through the following technical scheme: a secondary grouting hole structure comprises a grouting spiral pipe, an embedded spiral pipe and a plug which are sequentially arranged from the right bottom to the top of a secondary grouting filling opening;

the top of the pre-buried screwed pipe is provided with a plug, the bottom of the pre-buried screwed pipe is provided with a grouting spiral pipe, one end of the pre-buried screwed pipe is provided with a check valve, the check valve is positioned between the pre-buried screwed pipe and the grouting spiral pipe,

slurry coagulator is poured into the pre-buried threaded pipe, and a sealing ring and a grouting pipe plug are installed at the bottom of the grouting spiral pipe.

In the above technical scheme: and a grouting pipe sealing ring is arranged between the check valve and the grouting spiral pipe.

In the above technical scheme: the inner wall of the embedded threaded pipe is threaded, and the pipe diameter of the embedded threaded pipe is larger than that of the grouting spiral pipe.

The utility model has the advantages of as follows: 1. the utility model discloses improve secondary slip casting pore structure, increase one section pre-buried screwed pipe in section of jurisdiction thickness direction slip casting section to prefabricate into the wedge with the screwed pipe. Like this, after the secondary slip casting, the bonding that the thick liquid can be fine with pre-buried screwed pipe, area of contact increases, and the thick liquid condenses into the thick liquid behind the thick liquid piece with the frictional force increase of screwed pipe.

2. The utility model provides a thick liquid coagulation piece finally becomes the wedge, can form the bayonet socket in the section of jurisdiction, should not become flexible and drop. This has greatly increased the stagnant water performance of construction period and operation period secondary slip casting hole.

3. The utility model discloses overall structure is simple, and the construction is convenient, need not do any change to current template, and the expense of increase is very little, and the real-time is extremely strong.

Drawings

FIG. 1 is a view showing a state of a grouting hole before secondary grouting.

Fig. 2 is a diagram of a grouting hole after secondary grouting.

Wherein: the grouting device comprises a check valve 1, a grouting pipe sealing ring 2, a plug 3, a pre-buried threaded pipe 4, a grouting spiral pipe 5, a sealing ring 6, a grouting pipe plug 7, a slurry condensation block 8 and a secondary grouting filling opening 9.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to FIGS. 1-2: a secondary grouting hole structure comprises a grouting spiral pipe 5, an embedded threaded pipe 4 and a plug 3 which are sequentially arranged from the right lower part to the upper part of a secondary grouting filling opening 9; the top of the pre-buried threaded pipe 4 is provided with a plug 3, the bottom of the pre-buried threaded pipe is provided with a grouting spiral pipe 5, one end of the pre-buried threaded pipe 4 is provided with a check valve 1, the check valve 1 is positioned between the pre-buried threaded pipe 4 and the grouting spiral pipe 5,

and after the secondary lining grouting is finished, a slurry coagulation block 8 is poured into the embedded threaded pipe 4, and a sealing ring 6 and a grouting pipe plug 7 are installed at the bottom of the grouting spiral pipe 5.

And a grouting pipe sealing ring 2 is arranged between the check valve 1 and the grouting spiral pipe 5. The inner wall of the pre-buried screwed pipe 4 is in a thread shape, and the pipe diameter of the pre-buried screwed pipe is larger than that of the grouting spiral pipe 5.

The utility model discloses still include as follows implementation engineering: the grouting spiral pipe 5 is screwed in the grouting head in advance, firstly, a drill rod extends into a secondary grouting hole 9, a concrete structure at the upper end of the plug 3 is drilled, meanwhile, the other end of the grouting head is connected with a ball valve, grouting is started after a grouting pipeline is connected, grout enters the outer side of a concrete pipe piece through the secondary grouting filling hole 9, a water stop valve 1 and an embedded threaded pipe 4, a gap between the pipe piece and the ground is filled, and meanwhile, the grout is prevented from flowing back through a check valve 1 arranged at the tail part of the embedded threaded pipe 4.

After the secondary grouting is finished, the grouting head is screwed out of the grouting spiral pipe 5, the position of the original grouting spiral pipe 5 is free to form a cavity, and the end part of the grouting spiral pipe 5 is stuffed with a grouting pipe plug 7 and a grouting pipe plug sealing ring 6.

Along with the operation of the tunnel, the grouting pipe plug 7 is easy to corrode and fall off, and a good anti-seepage effect is difficult to achieve. But the secondary grouting hole provides seepage prevention and water stop by means of the bonding friction between the grout congealing block 8 and the embedded threaded pipe 4.

The above-mentioned parts not described in detail are prior art.

Claims (3)

1. A secondary grouting hole structure comprises a grouting spiral pipe (5), an embedded threaded pipe (4) and a plug (3) which are sequentially arranged from bottom to top from a secondary grouting filling opening (9); the method is characterized in that: the top of the pre-buried threaded pipe (4) is provided with a plug (3), the bottom of the pre-buried threaded pipe (4) is provided with a grouting spiral pipe (5), one end of the pre-buried threaded pipe (4) is provided with a check valve (1), the check valve (1) is positioned between the pre-buried threaded pipe (4) and the grouting spiral pipe (5),

slurry coagulator (8) is poured into the embedded threaded pipe (4), and a sealing ring (6) and a grouting pipe plug (7) are installed at the bottom of the grouting spiral pipe (5).

2. The secondary grouting hole structure of claim 1, wherein: and a grouting pipe sealing ring (2) is arranged between the check valve (1) and the grouting spiral pipe (5).

3. The secondary grouting hole structure of claim 1, wherein: the inner wall of the embedded threaded pipe (4) is threaded, and the pipe diameter of the embedded threaded pipe (4) is larger than that of the grouting spiral pipe (5).

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