CN218760017U

CN218760017U - Shield tunnel pump room ejection drainage structure

Info

Publication number: CN218760017U
Application number: CN202222978926.0U
Authority: CN
Inventors: 朱敏; 吴铭; 姚丽莎
Original assignee: Changjiang Institute of Survey Planning Design and Research Co Ltd
Current assignee: Changjiang Institute of Survey Planning Design and Research Co Ltd
Priority date: 2022-11-09
Filing date: 2022-11-09
Publication date: 2023-03-28
Anticipated expiration: 2032-11-09

Abstract

The utility model discloses a shield constructs ejecting drainage structures in tunnel pump room relates to the tunnel engineering field. The anti-gushing device comprises an anti-gushing device arranged at the top of the tunnel structure, a submersible pump arranged at the bottom of the tunnel structure, an inspection well arranged above the tunnel structure, and a drain pipe, wherein one end of the drain pipe is connected with the submersible pump, and the other end of the drain pipe extends out of the inspection well after passing through the anti-gushing device along the inner wall of the tunnel structure. The utility model discloses a prevent spouting the device in the vertical trompil in tunnel top, setting, can effectively solve the problem that the vertical drainage circuit in tunnel is long, the drainage work efficiency is low, the operation cost is high to vertical drainage only occupies the section that the minimum mark in tunnel exceeds, need not to occupy clearance section in the whole tunnel, further optimizes the use of clearance in the tunnel.

Description

Ejecting drainage structures in shield tunnel pump house

Technical Field

The utility model relates to a tunnel engineering field, it is the ejecting drainage structures in shield tunnel pump room that says so more specifically.

Background

With the rapid development of municipal engineering construction of various cities, tunnel engineering gradually occupies higher and higher proportion in municipal engineering by virtue of the advantages of small influence on surrounding environmental landscapes and the like; when crossing along-line obstacles such as buildings, rail transit, railways, bridges and the like in a core area of an urban, a shield tunnel occupies higher and higher proportion in tunnel engineering by virtue of the advantages of high speed, high safety, small influence and the like.

In the operation process of the tunnel, the peripheral underground water inevitably enters the tunnel, a water collecting point is formed at the lowest point of the line, and in addition, in the operation process of the highway tunnel and the subway tunnel, the water for cleaning the road surface and the water for fire fighting of the tunnel form the water collecting point at the lowest point, so a pump room is required to be arranged at the water collecting point, and a pipeline is laid to discharge the sewage to a municipal pipe network at the periphery of the ground through a submersible pump.

The drainage scheme commonly used at present is:

the pump house is used as a starting point, a pipeline (the length of the shield tunnel is generally more than several hundred meters) is laid in the tunnel along the shortest direction of a certain pipeline, and the ground section outside the tunnel is connected to a peripheral municipal pipe network. When the laying line is longer, the power requirement on the submersible pump is increased, and the operation cost is increased.

The lowest point of the tunnel line is provided with a vertical drainage pipeline which is connected into a ground municipal pipe network, the pipeline is short (the length is the buried depth of the tunnel and is less than 60m under the general condition), and the requirement on the power of the submersible pump is low. When the vertical drainage pipeline is arranged at the top of the tunnel, the sequential construction procedures need to be solved; if a vertical drainage pipeline is laid on the ground to the top of the shield tunnel in advance, the pipeline is difficult to be connected into the shield tunnel after the shield tunnel passes the driving; only after the tunnel is constructed, the top of the shield tunnel is perforated, and then the tunnel is vertically drilled to the ground surface and a pipeline is installed.

The conventional hole opening scheme has large construction risks, such as surrounding water and soil possibly flowing into the tunnel along the opening during the opening of the top of the shield tunnel, and if stratum reinforcing modes such as a high-pressure jet grouting pile and a triaxial stirring pile are adopted to reinforce the peripheral soil outside the open-hole tunnel in advance, the hole opening risk can be reduced, but the defect of high cost exists. If under high water pressure conditions, even through formation consolidation, there is still a significant risk of perforating the tunnel roof.

Therefore, a shield tunnel pump room ejection drainage structure with high construction speed, low construction risk and low construction cost needs to be researched.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the weak point of above-mentioned background art, and provide a shield tunnel pump house ejecting drainage structures.

In order to realize the purpose, the technical scheme of the utility model is that: the utility model provides a shield tunnel pump house ejecting drainage structure which characterized in that: the device comprises a blowout prevention device arranged at the top of a tunnel structure, a submersible pump arranged at the bottom of the tunnel structure, an inspection well arranged above the tunnel structure, and a drain pipe, wherein one end of the drain pipe is connected with the submersible pump, and the other end of the drain pipe extends out of the inspection well after passing through the blowout prevention device along the inner wall of the tunnel structure.

In the technical scheme, the anti-blowout device comprises an orifice pipe, a ball valve arranged in the middle of the orifice pipe and a drain pipe sealing device sleeved on the orifice pipe.

In the technical scheme, one end of the drain pipe is connected with the submersible pump, the other end of the drain pipe is detachably connected with the drill bit, and the drill bit is detached after the drain pipe extends into the manhole.

In the technical scheme, the top of the tunnel structure is provided with an opening, the opening error is not more than 50mm-100mm, and the maximum vertical deflection of the opening is not more than 100mm-200mm; the anti-gushing device is positioned in the open hole.

In the technical scheme, the drain pipe is a low-carbon steel seamless steel pipe with the diameter of 108 multiplied by 8mm, the joints between the pipe joints of the drain pipe are connected in a welding mode of lining pipe hoops and screw threads, and the tensile strength is not lower than 75% of that of the main pipe.

In the technical scheme, the manhole is of a cylindrical reinforced concrete structure, the plane diameter is 800-1000mm, the structure wall thickness is 120-150mm, the structure depth is 1500-1950mm, and the drainage pipe is horizontally provided with a hole on a side wall 500-650mm above a bottom plate of the manhole and is connected to a peripheral municipal drainage pipe network.

Compared with the prior art, the utility model has the advantages of it is following:

1) The utility model discloses a prevent spouting the device at the vertical trompil in tunnel top, setting, can effectively solve the problem that the vertical drainage circuit in tunnel is long, the drainage work efficiency is low, the operation cost is high to vertical drainage only occupies the section that the minimum point mark in tunnel exceeds, need not to occupy clearance section in the whole tunnel, further optimizes the use of clearance in the tunnel.

2) The utility model discloses can be applicable to in all kinds of construction method tunnels that weak stratum, groundwater are abundant, like various tunnels such as pipe jacking method tunnel, mine method tunnel.

Drawings

Fig. 1 is a schematic structural diagram of the utility model.

Fig. 2 is a schematic structural diagram of an open-hole anti-gushing device.

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings, which are not intended to limit the present invention, but are merely exemplary. While the advantages of the invention will be clear and readily appreciated by the description.

With reference to the accompanying drawings: the utility model provides a shield tunnel pump house ejecting drainage structure which characterized in that: including setting up the device 2 that prevents gushing at tunnel structure 1 top, set up the immersible pump 3 in tunnel structure 1 bottom, set up the inspection shaft 4 in tunnel structure 1 top, one end is connected with immersible pump 3, the other end passes along tunnel structure 1 inner wall and stretches out the drain pipe 5 of inspection shaft 4 behind the device 2 that prevents gushing.

The anti-blowout device 2 comprises an orifice pipe 21, a ball valve 22 arranged in the middle of the orifice pipe 21 and a drain pipe sealing device 23 sleeved on the orifice pipe 21; before drilling construction, a reliable and effective anti-gushing device 2 is required to be installed, a phi 146 orifice pipe 21 is installed firstly, then a ball valve 22 of DN125 is installed, then a phi 108 drain pipe sealing device 23 is installed, and finally the ball valve 22 is opened for drilling; when the drain pipe 5 is constructed, the soil mass loss is not larger than the volume of the drain pipe 5, otherwise, grouting is carried out in time to control stratum settlement.

One end of the drain pipe 5 is connected with the submersible pump 3, the other end of the drain pipe is detachably connected with the drill bit 51, and the drill bit 51 is detached after the drain pipe 5 extends into the manhole 4.

The top of the tunnel structure 1 is provided with an opening which is arranged at the top of the center of a certain segment structure so as to be beneficial to opening the inner arc surface of the shield tunnel; the error of the opening is not more than 50mm-100mm, and the maximum vertical deflection of the opening is not more than 100mm-200mm; if the standard is exceeded, the plane positions of the ground manhole and the peripheral pipelines need to be checked in advance on site, and the vertical deviation of the pipelines out of the ground is prevented from being too large; the anti-gushing device is positioned in the open hole.

The drain pipe 5 is a low-carbon steel seamless steel pipe with the diameter of 108 mm multiplied by 8mm, the interfaces between the pipe joints of the drain pipe 5 are connected in a welding mode of lining pipe hoops and screw threads, and the tensile strength is not lower than 75% of that of the main pipe.

The manhole 4 is of a cylindrical reinforced concrete structure, the plane diameter is 800-1000mm, the structure wall thickness is 120-150mm, the structure depth is 1500-1950mm, and the drain pipe 5 is horizontally provided with a hole on the side wall 500-650mm above the bottom plate of the manhole 4 and is connected to a peripheral municipal drainage pipe network.

In the in-service use, the utility model discloses shield tunnel top secondary trompil erects water drainage line in step during the trompil, inserts peripheral sewage municipal pipe network behind the water drainage line extension to the earth's surface, realizes tunnel top drainage. The utility model discloses compare vertical drainage mode in current tunnel, can shorten drain line length by a wide margin, improve the drainage work efficiency, reduce the operation cost.

In order to lay the drain pipe 5 in the stratum at the top of the tunnel at one time while drilling, the end part of a drill bit 51 of the drain pipe 5 is welded with the end part of the drain pipe 5, the drill bit 51 is cut after the hole is drilled to the ground, and the drain pipe 5 is reserved; after the drain pipe 5 is finished, pressure testing is required. The test pressure should be 2 times of the designed working pressure, and should not be lower than 0.80MPa. The pressure drop should not exceed 0.05MPa after the pressure test for 30min, and the pressure is kept to be qualified after the pressure test for 15 min. And after the drilling construction of the drain pipe 5 is finished, the plane position of the ground water collecting well is timely adjusted according to the actual hole opening position of the drain pipe 5, and the ground water collecting well is connected into a peripheral municipal pipe network.

The utility model discloses a construction method, including following step:

step 1: in the construction of the shield tunnel, during the assembly of the duct pieces, the duct piece structure of the planned opening at the top of the tunnel structure 1 needs to be ensured to be an adjacent block or a standard block.

And 2, step: a scaffold is erected in the tunnel structure 1, and a piping piece structure with holes to be opened is provided with an anti-gushing device 2.

And step 3: and (5) repeatedly measuring the position of the open hole, and building the manhole 4 on the ground.

And 4, step 4: and drilling under the protection of the anti-gushing device 2, and sequentially drilling the tunnel structure 1 and the stratum until the ground manhole 4.

And 5: cutting the drill bit 51 in the manhole 4, keeping the drain pipe 5, and communicating the drain pipe with a peripheral municipal pipe network after the pressure test meets the design requirement.

Other parts not described belong to the prior art.

Claims

1. The utility model provides a shield tunnel pump house ejecting drainage structure which characterized in that: the anti-gushing device comprises an anti-gushing device (2) arranged at the top of a tunnel structure (1), a submersible pump (3) arranged at the bottom of the tunnel structure (1), an inspection well (4) arranged above the tunnel structure (1), and a drain pipe (5) with one end connected with the submersible pump (3) and the other end extending out of the inspection well (4) after passing through the anti-gushing device (2) along the inner wall of the tunnel structure (1).

2. The shield tunnel pump room ejection drainage structure of claim 1, characterized in that: the anti-gushing device (2) comprises an orifice pipe (21), a ball valve (22) arranged in the middle of the orifice pipe (21) and a drain pipe sealing device (23) sleeved on the orifice pipe (21).

3. The shield tunnel pump room ejection drainage structure of claim 2, characterized in that: one end of the drain pipe (5) is connected with the submersible pump (3), the other end of the drain pipe is detachably connected with the drill bit (51), and the drill bit (51) is detached after the drain pipe (5) extends into the manhole (4).

4. The shield tunnel pump room ejection drainage structure of claim 3, characterized in that: the top of the tunnel structure (1) is provided with an opening, the opening error is not more than 50mm-100mm, and the maximum vertical deflection of the opening is not more than 100mm-200mm; the anti-gushing device is positioned in the open hole.

5. The shield tunnel pump house ejecting and draining structure of claim 4, characterized in that: the drain pipe (5) is a low-carbon steel seamless steel pipe with the diameter of 108 mm multiplied by 8mm, the joints between the pipe joints of the drain pipe (5) are connected in a welding mode of lining pipe hoops and screw threads, and the tensile strength is not lower than 75% of that of the female pipe.

6. The shield tunnel pump room ejection drainage structure of claim 5, characterized in that: the manhole (4) is of a cylindrical reinforced concrete structure, the plane diameter is 800-1000mm, the structure wall thickness is 120-150mm, the structure depth is 1500-1950mm, and the drain pipe (5) is horizontally provided with a hole on a 500-650mm side wall above the bottom plate of the manhole (4) and is connected to a peripheral municipal drainage pipe network.