CN218263770U

CN218263770U - A drainage device for shutoff of diversion tunnel

Info

Publication number: CN218263770U
Application number: CN202222810318.9U
Authority: CN
Inventors: 杨承志; 于永军; 曾凡杜; 王海东; 向可; 赵源
Original assignee: Sinohydro Bureau 8 Co Ltd
Current assignee: Sinohydro Bureau 8 Co Ltd
Priority date: 2022-10-24
Filing date: 2022-10-24
Publication date: 2023-01-10
Anticipated expiration: 2032-10-24

Abstract

The utility model discloses a drainage device for plugging a diversion tunnel, wherein an end cap is arranged in the diversion tunnel, a grouting gallery is arranged in the end cap, a valve well is arranged below the grouting gallery, and a cofferdam is arranged at the upstream side of the end cap; the drainage device comprises a drainage pipe, and the drainage pipe penetrates through the cofferdam, the plug and the valve well; the upstream end of the drain pipe extends upwards, the opening of the drain pipe is bent towards the upstream to form a bending section, and the bending section is positioned on the upstream side of the cofferdam; in the valve well, a first valve is arranged on the drain pipe, a first slurry inlet pipe communicated with the drain pipe is arranged on the upstream side of the first valve, and a second slurry inlet pipe communicated with the drain pipe is arranged on the downstream side of the first valve; a second valve is arranged on the first slurry inlet pipe, and a third valve is arranged on the second slurry inlet pipe; and a slurry return pipe positioned on the downstream side of the plug is arranged on the water discharge pipe, and a fourth valve is arranged on the slurry return pipe. The utility model discloses a drainage device can carry out effective shutoff respectively to drain pipe upper and lower trip, has characteristics such as simple structure, construction interference are few.

Description

A drainage device for shutoff of diversion tunnel

Technical Field

The utility model belongs to the technical field of hydraulic and hydroelectric engineering, concretely relates to a drainage device for diversion tunnel shutoff.

Background

In order to meet the requirements of construction and development of water conservancy and hydropower engineering, temporary water release buildings such as diversion tunnels and the like are usually required to be built in the construction period, and water retaining buildings such as upstream and downstream cofferdams and the like are arranged to ensure dry construction of permanent buildings. When the project is finished, temporary water discharge structures such as diversion tunnels and the like are often required to be plugged so as to meet the target requirements of water storage and power generation of the project and the like. Because of the temporary water outlet structures such as the diversion tunnel are scoured by a long-term high water head and a large flow rate, the temporary water outlet structures have damages of different degrees, and the positions such as a diversion tunnel gate have siltation phenomena of different degrees, so that when the diversion tunnel is closed, certain water leakage or water seepage conditions exist, and certain influence is brought to the construction of the diversion tunnel closure. In order to realize the dry land construction of diversion tunnel plugging, temporary cofferdams are often arranged on the upstream and downstream of a plug, and drain pipes are configured according to the size of leakage water so as to realize that accumulated water on the upstream of the plug is drained out of the temporary cofferdams on the downstream. After the drain pipe finishes the drainage function, the drain pipe is usually plugged by grouting. In order to meet the requirement of drain pipe plugging, the traditional method is to arrange water closing devices such as an electromagnetic valve and the like at a water inlet of a drain pipe, arrange a butterfly valve and the like at a water outlet of the drain pipe, arrange grouting pipes and the like at the water inlet and the water outlet, have relatively complex structures, need to embed a plurality of pipelines, and have the problems of large construction interference, large protection difficulty and the like.

The Chinese utility model patent publication No. CN215888150U discloses a diversion tunnel concrete plug drain pipe plugging device, wherein valve wells are reserved on the left and right sides of the upstream end of a grouting gallery of the concrete plug, a drainage steel pipe passes through the valve wells below the concrete plug, and a drainage pipe valve and a grouting pipe are arranged on the drainage steel pipe in the valve wells; after concrete of the concrete plug is poured, climbing to the position below the valve well through the valve well side wall crawling ladder to manually close the drainage pipe valve; and after the drainage steel pipe behind the drainage pipe valve is cleaned, welding a steel plate and an exhaust pipe at the downstream outlet end of the drainage steel pipe, opening the grouting pipe valve to perform grouting or fine stone concrete backfilling on the drainage steel pipe, and performing concrete plugging on the valve well and the upstream section of the grouting gallery after plugging of the drainage steel pipe is completed. The utility model discloses a only provide the shutoff of valve well downstream section drainage steel pipe, and drainage steel pipe upper reaches section still exists difficult shutoff, the big problem of the shutoff degree of difficulty.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model provides a drainage device for shutoff of diversion tunnel, after drainage function was accomplished to the drain pipe among the drainage device, can carry out effective shutoff respectively to drain pipe upper and lower stream.

In order to achieve the above object, the utility model adopts the following technical scheme:

a drainage device for blocking a diversion tunnel is characterized in that a plug is arranged in the diversion tunnel, a grouting gallery is arranged in the plug, a valve well is arranged below the grouting gallery, and a cofferdam is arranged on the upstream side of the plug; the structure is characterized in that: the drainage device comprises a drainage pipe, and the drainage pipe penetrates through the cofferdam, the plug and the valve well; the upstream end of the drainage pipe extends upwards, the opening of the drainage pipe is bent towards the upstream to form a bending section, and the bending section is positioned on the upstream side of the cofferdam; in the valve well, a first valve is arranged on the drain pipe, a first slurry inlet pipe communicated with the drain pipe is arranged on the upstream side of the first valve, and a second slurry inlet pipe communicated with the drain pipe is arranged on the downstream side of the first valve; a second valve is arranged on the first slurry inlet pipe, and a third valve is arranged on the second slurry inlet pipe; and a slurry return pipe positioned on the downstream side of the plug is arranged on the drain pipe, and a fourth valve is arranged on the slurry return pipe.

When the drainage device is installed, in order to improve the overflowing capacity of the early-stage drain pipe and reduce the engineering quantity of the cofferdam, the bending section can be connected with the drain pipe after the plug is poured to a certain height, and the installation of the drainage device is completed. At the moment, the water can be retained by the plug so as to meet the requirement of temporary drainage. After the drainage device finishes the drainage function, the first valve is closed, the second valve is opened, and the first slurry inlet pipe is grouted. And after grouting is finished, after the drain pipe is backfilled and grouted for 1 day, opening the second valve to check whether water leakage exists, and if water leakage exists, continuing backfilling and grouting until water leakage does not occur. And removing the first valve, the second valve and part of the drain pipe between the first valve and the second slurry inlet pipe, and sealing the first slurry inlet pipe and the drain pipe in the valve well by adopting a closed end plate. And then, performing grouting plugging on the backfilled concrete plug of the valve well and the downstream of the drain pipe, and sealing the downstream end part of the drain pipe by adopting a closed end plate. And opening the third valve and the fourth valve, grouting the second grout inlet pipe, removing the third valve and the fourth valve after grouting is finished, and sealing the second grout inlet pipe and the second grout return pipe by adopting a closed end plate. The valve well can be arranged before the downstream plugging of the drain pipe or after the downstream plugging of the drain pipe.

The utility model discloses drainage device has guaranteed the shutoff pressure of later stage drain pipe through setting up the section of bending, ensures later stage grout quality, has eliminated the drain pipe import department simultaneously and has brought the hidden danger of infiltration because of closing water installation operation needs and arranging the circuit in the end cap. Meanwhile, the drainage pipe can be plugged by stage construction, the amount of cofferdam engineering can not be increased by arranging the bending section, and the cofferdam has the advantages of low engineering cost, less engineering amount, simplicity in operation and the like.

Specifically, the section of bending includes from last section of bending, straight tube section and the section of bending down that is linked together in order down, the section of bending down is linked together with the drain pipe.

In order to improve the grouting quality when the upstream of the drain pipe is plugged, preferably, the height difference between the top height of the upward bending section and the highest point of the drain pipe is greater than or equal to 0.5m.

Specifically, the opening of the upward bending section faces to the side far away from the cofferdam.

Specifically, the second slurry inlet pipe extends upwards into the grouting gallery, and the third valve is arranged in the grouting gallery. When the plug of the valve well is arranged before the downstream plug of the drain pipe, after the valve well is plugged, grouting operation can be carried out on the downstream of the drain pipe in the grouting gallery.

Specifically, be equipped with a plurality of seal rings on the drain pipe, it is a plurality of seal ring sets up along drain pipe length direction.

Specifically, a water collecting tank is arranged on the downstream side of the plug and is arranged below the end part of the drain pipe. The water collecting tank is arranged to collect accumulated water discharged by the water discharging pipe.

Compared with the prior art, the beneficial effects of the utility model are as follows:

1. the utility model discloses a drainage device for diversion tunnel shutoff through setting up the section of bending, has guaranteed the shutoff pressure of later stage drain pipe, ensures later stage grout quality, has eliminated drain pipe import department simultaneously and has brought the hidden danger of infiltration because of the device operation needs of closing water in the end cap interior arrangement circuit.

2. The utility model discloses a drainage device for shutoff of diversion tunnel, drain pipe wherein can adopt the shutoff of being under construction by stage, and the section of bending can not increase cofferdam engineering volume in the setting, has that engineering cost is low, engineering volume economizes, advantages such as easy operation.

Drawings

Fig. 1 is a schematic structural view of a drainage device for plugging a diversion tunnel according to the present invention;

fig. 2 is a schematic diagram of an upstream blocking structure of the drainage pipe in fig. 1.

In the figure, 1-cofferdam; 2-a water collecting tank; 3-a drainage device; 31-a drain pipe; 32-a first valve; 33-a first slurry inlet pipe; 34-a second slurry inlet pipe; 35-a second valve; 36-a third valve; 37-a slurry return pipe; 38-a fourth valve; 39-water stop ring; 4-grouting gallery; 5-valve well; 6-closed end plate; 7-plug; 8-bending sections; 81-upper bending section; 82-a straight tube section; 83-downward bending section.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. It should be noted that, in the case of no conflict, the embodiments and features of the embodiments of the present invention may be combined with each other. For convenience of description, the words "upper", "lower", "left" and "right" in the following description are used only to indicate the correspondence with the upper, lower, left and right directions of the drawings, and do not limit the structure.

As shown in fig. 1, a drainage device for shutoff of diversion tunnel, be equipped with end cap 7 in the diversion tunnel, be equipped with grout corridor 4 in the end cap 7, grout corridor 4 below is equipped with valve well 5, the upstream side of end cap 7 is equipped with cofferdam 1. The direction of the arrows in the figure indicates the direction of the water flow, and the side of the cofferdam 1 is the upstream side. The drainage device 3 comprises a drainage pipe 31, the drainage pipe 31 penetrates through the cofferdam 1, the plug 7 and the valve well 5, and the downstream of the drainage pipe 31 is connected to the water collecting tank 2. The first pulp inlet pipe 33, the second pulp inlet pipe 34 and the pulp return pipe 37 are welded on the water outlet pipe 31 and are communicated with each other, then the water stop ring 39 is welded on the water outlet pipe 31, and the water outlet pipe 31, the first pulp inlet pipe 33, the second pulp inlet pipe 34 and the pulp return pipe 37 are all steel pipes. In the valve well 5, a first valve 32 is connected to the water discharge pipe 31 by a flange, a first slurry inlet pipe 33 is provided on the upstream side of the first valve 32, and a second slurry inlet pipe 34 is provided on the downstream side of the first valve 32. The first grout inlet pipe 33 is provided with a second valve 35, and the second grout inlet pipe 34 is provided with a third valve 36. The slurry return pipe 37 is arranged on the downstream side of the plug 7, a fourth valve 38 is arranged on the slurry return pipe 37, and the first valve 32, the second valve 35, the third valve 36 and the fourth valve 38 are gate valves.

When the water is drained, the first valve 32 is opened, the second valve 35, the third valve 36 and the fourth valve 38 are closed, and the upstream accumulated water is introduced into the downstream collecting tank 2 through the drain pipe 31. In order to improve the overflowing capacity of the early-stage drain pipe 31 and reduce the engineering quantity of the upstream cofferdam 1, after the concrete of the plug 7 is poured to a certain height, the bent section 8 is installed at the upstream end part of the drain pipe 31, and the installation of the drainage device 3 is completed. At the moment, water can be retained by the plug 7 so as to meet the requirement of temporary drainage. As shown in fig. 1, the bending section 8 includes an upward bending section 81, a straight pipe section 82 and a downward bending section 83 which are sequentially communicated from top to bottom, an opening of the upward bending section 81 faces to a side far away from the cofferdam 1, and the downward bending section 83 is communicated with the drain pipe 31 through a flange. The height difference between the top height of the upper bent section 81 and the highest point of the drain pipe 31 is greater than or equal to 0.5m, and the bent section 8 is made of a steel pipe.

After the drainage device 3 finishes the drainage function, the first valve 32 is firstly closed, the second valve 35 is opened, the first grout inlet pipe 33 is grouted, and the grout adopts a ratio of 0.5:1 cement slurry. After the grouting is finished, after the drain pipe 31 is backfilled and grouted for 1 day, the second valve 35 is opened to check whether water leakage exists, and if water leakage exists, the backfilling grouting is continued until water leakage does not occur. As shown in fig. 2, the first valve 32, the second valve 35 and the joint steel pipe between the first valve 32 and the second slurry inlet pipe 34 are removed, the first slurry inlet pipe 33 and the water outlet pipe 31 are sealed by the closed end plate 6, and the closed end plate 6 is made of a 12mm thick steel plate. And (3) vertically extending a second slurry inlet pipe 34 from the valve well 5 upwards into the grouting gallery 4, and arranging a third valve 36 in the grouting gallery 4 to carry out backfill concrete plugging on the valve well 5. After the gate well 5 is plugged, the section of steel pipe at the downstream of the drain pipe 31 is removed, and the end of the drain pipe 31 is sealed by the closed end plate 6. And opening the third valve 36 and the fourth valve 38 to grout the second grout inlet pipe 34, wherein the grout adopts a ratio of 0.5:1 cement slurry. After grouting, the third valve 36 and the fourth valve 38 are removed, and the second slurry inlet pipe 34 and the slurry return pipe 37 are sealed by the closed end plate 6, so that the water outlet pipe 31 is sealed. In order to improve the grouting quality, a pure pressure grouting method can be adopted, and grouting is finished after the grouting amount is controlled to be not less than 2-3 times of the volume of the drain pipe 31.

The above-mentioned embodiments are illustrative and should not be construed as limiting the scope of the invention, which is defined by the appended claims, and all modifications of the equivalent forms of the present invention which are obvious to those skilled in the art after reading the present invention.

Claims

1. A drainage device for plugging a diversion tunnel is characterized in that a plug (7) is arranged in the diversion tunnel, a grouting gallery (4) is arranged in the plug (7), a valve well (5) is arranged below the grouting gallery (4), and a cofferdam (1) is arranged on the upstream side of the plug (7); the method is characterized in that: the drainage device (3) comprises a drainage pipe (31), and the drainage pipe (31) penetrates through the cofferdam (1), the plug (7) and the valve well (5);

the upstream end of the drain pipe (31) extends upwards, the opening of the drain pipe is bent towards the upstream to form a bent section (8), and the bent section (8) is positioned on the upstream side of the cofferdam (1);

in the valve well (5), a first valve (32) is arranged on the water discharge pipe (31), a first slurry inlet pipe (33) communicated with the water discharge pipe (31) is arranged on the upstream side of the first valve (32), and a second slurry inlet pipe (34) communicated with the water discharge pipe (31) is arranged on the downstream side of the first valve (32);

a second valve (35) is arranged on the first slurry inlet pipe (33), and a third valve (36) is arranged on the second slurry inlet pipe (34);

and a slurry return pipe (37) positioned on the downstream side of the plug (7) is arranged on the drain pipe (31), and a fourth valve (38) is arranged on the slurry return pipe (37).

2. The drainage device for diversion tunnel plugging of claim 1, wherein: the bending section (8) comprises an upper bending section (81), a straight pipe section (82) and a lower bending section (83) which are sequentially communicated from top to bottom, and the lower bending section (83) is communicated with the drain pipe (31).

3. The drainage device for diversion tunnel plugging of claim 2, wherein: the height difference between the top height of the upper bent section (81) and the highest point of the drain pipe (31) is greater than or equal to 0.5m.

4. The drainage device for diversion tunnel plugging of claim 2, wherein: the opening of the upward bending section (81) faces to the side far away from the cofferdam (1).

5. The drainage device for plugging the diversion tunnel according to any one of claims 1 to 4, wherein: the second slurry inlet pipe (34) extends upwards into the grouting gallery (4), and the third valve (36) is arranged in the grouting gallery (4).

6. The drainage device for diversion tunnel plugging according to any one of claims 1 to 4, wherein: the water draining pipe (31) is provided with a plurality of water stopping rings (39), and the water stopping rings (39) are arranged along the length direction of the water draining pipe (31).

7. The drainage device for diversion tunnel plugging according to any one of claims 1 to 4, wherein: the water collecting tank (2) is arranged on the downstream side of the plug (7), and the water collecting tank (2) is arranged below the end part of the drain pipe (31).