CN218759881U - Freezing ejection structure of connecting channel - Google Patents

Abstract

The utility model discloses a networking channel freezes ejecting structure relates to the tunnel engineering field. The salt water freezing device comprises an anti-surging device arranged at the top of a tunnel structure, a communication channel arranged between the two tunnel structures, a salt water freezing device arranged above the two tunnel structures, and a freezing pipe, wherein one end of the freezing pipe is connected with the bottom of the tunnel structure, and the other end of the freezing pipe is connected with the salt water freezing device after penetrating through the anti-surging device along the inner wall of the tunnel structure. The utility model discloses a prevent spouting the device at the vertical trompil in tunnel structure top, setting, can effectively solve the vertical circuit that freezes that exists when freezing the construction long, freeze the work efficiency low, problem such as construction cost height.

Description

Freezing ejection structure of connecting channel

Technical Field

The utility model relates to a tunnel engineering field, the more specifically it is a networking channel freezes ejecting structure that says so.

Background

The communication channel is a channel or door opening connecting two up-down traffic interval tunnels on the same line, and is used for safely evacuating passengers from an accident tunnel to an accident-free tunnel when a train encounters disasters such as fire and the like and stops running due to accidents.

According to subway design specifications (GB 50157-2013), two single-line interval tunnels are provided with contact channels, and the distance between two adjacent contact channels is not more than 600m; and the interval drainage pump station is constructed together with an interval communication channel or an intermediate air shaft under the condition.

At present, when the contact channel is constructed in various stratums such as various weak stratums, water-rich stratums and the like, the freezing method is mainly adopted for construction. The main principle of the freezing method is that the heat in the stratum is replaced by cooled brine or liquid nitrogen as a medium, so that the stratum is frozen, and the stratum achieves certain strength and water stopping performance. The brine freezing is most widely applied with good economy, and the process mainly uses brine freezing equipment as a starting and ending point, uses low-temperature brine as a medium, and forms a circulation loop through freezing pipes arranged in the stratum so as to achieve the aim of freezing the stratum.

The brine freezing equipment mainly comprises a freezing unit, a brine tank, a brine pump, a clean water pump, a cooling tower, a plurality of power distribution control cabinets and the like. This set of equipment needs to occupy certain place, sets up certain station hall layer at tunnel both ends under the general condition to do not influence other operation face constructions in the station.

The currently common saline freezing scheme is to lay a pipeline (the length of a shield tunnel is generally at least several hundred meters) in a tunnel along the shortest direction of a certain pipeline by taking saline freezing equipment at a station as a starting point. When a laying line is long, the laying length of the freezing pipe in the tunnel is increased, the heat loss along the freezing pipe is increased, the power of a refrigerating unit needs to be increased to ensure that a tail end medium reaches a design temperature, and the construction cost is increased. When the length of the freezing pipe laid in the tunnel reaches 1.5km, the freezing effect of the tail end is reduced, and a freezing unit needs to be placed in the tunnel to shorten the length of the freezing pipe. However, the freezing units in the tunnel occupy a large area, which affects other operation and construction in the tunnel.

If a vertical freezing pipeline is arranged right above a tunnel connecting channel, the brine freezing equipment is arranged on the ground, the length of the pipeline is short (the length is the buried depth of the tunnel, and the buried depth of the subway tunnel is less than 30m under the common condition), and the requirement on the power of a freezing unit is low.

When the vertical freezing pipeline is arranged at the top of the tunnel, the sequential construction procedures need to be solved; if a vertical freezing pipeline is laid on the ground in advance to the top of the shield tunnel, the pipeline is difficult to be connected into the shield tunnel after the shield tunnel passes the tunneling; only after the tunnel construction, the top of the shield tunnel is drilled, and the freezing pipeline is installed after the vertical drilling to the ground surface.

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 great risk of perforating the tunnel roof.

Therefore, a connection channel freezing ejection structure which is high in construction speed, low in construction risk and low in construction cost needs to be researched.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the shortcomings of the background technology and providing a frozen ejection structure of a connecting channel.

In order to realize the purpose, the technical scheme of the utility model is that: the utility model provides a linkage passageway freezes ejecting structure which characterized in that: the salt water freezing device comprises a blowout preventing device arranged at the top of a tunnel structure, a connecting channel arranged between the two tunnel structures, a salt water freezing device arranged above the two tunnel structures, and a freezing pipe, wherein one end of the freezing pipe is connected with the bottom of the tunnel structure, and the other end of the freezing pipe is connected with the salt water freezing device after passing through the blowout preventing 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 freezing pipe sealing device sleeved on the orifice pipe.

In the technical scheme, one end of the freezing pipe is connected with the bottom of the tunnel structure, the other end of the freezing pipe is detachably connected with the drill bit, and the drill bit is detached after the freezing pipe extends out of the ground.

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 freezing pipe is a low-carbon steel seamless steel pipe with the diameter of 108 multiplied by 8mm, the interfaces between the freezing pipe sections 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 mother pipe.

In the above technical solution, the brine freezing apparatus is installed on the ground.

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 structure top, setting, can effectively solve the vertical circuit that freezes that exists when freezing the construction long, freeze the work efficiency low, problem such as construction cost height.

2) The utility model discloses can solve in the tunnel arrange freeze the salt solution equipment, arrange in the tunnel and vertically freeze the place that the pipe exists and occupy the problem.

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.

Fig. 3 is a schematic structural diagram of prior art 1.

Fig. 4 is a schematic structural diagram of prior art 2.

The system comprises a tunnel structure 1, a blowout preventer 2, a port pipe 21, a ball valve 22, a freezing pipe sealing device 23, a communication channel 3, a brine freezing device 4, a freezing pipe 5, a drill bit 51, a ground 6 and a station 7.

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 linkage passageway freezes ejecting structure which characterized in that: the device comprises a gush prevention device 2 arranged at the top of a tunnel structure 1, a communication channel 3 arranged between the two tunnel structures 1, brine freezing equipment 4 arranged above the two tunnel structures 1, and a freezing pipe 5, wherein one end of the freezing pipe is connected with the bottom of the tunnel structure 1, and the other end of the freezing pipe passes through the gush prevention device 2 along the inner wall of the tunnel structure 1 and then is connected with the brine freezing equipment 4.

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 freezing pipe sealing device 23 sleeved on the orifice pipe 21.

One end of the freezing pipe 5 is connected with the bottom of the tunnel structure 1, the other end of the freezing pipe is detachably connected with a drill bit 51, and after the freezing pipe 5 extends out of the ground 6, the drill bit 51 is detached.

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; if the above specification is exceeded, the plane positions of the ground brine freezing equipment 4 and the peripheral pipelines need to be checked in advance on site, and the vertical deviation of the freezing pipelines out of the ground is prevented from being too large; the top at tunnel structure 1 certain section of jurisdiction structure center should be selected to the trompil position to be favorable to trompil on tunnel structure 1 intrados face.

Before drilling construction, a reliable and effective anti-gushing device 2 is required to be installed, a D300 orifice pipe 21 is installed firstly, a D250 ball valve 22 is installed secondly, a D220 freezing pipe sealing device 23 is installed secondly, and finally the ball valve 21 is opened for drilling; the loss of soil body when the freezing pipe 5 is constructed is not larger than the volume of the freezing pipe 5, otherwise, grouting is carried out in time to control the stratum settlement.

The anti-gushing device 2 is positioned in the open hole.

The freezing 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 freezing pipe 5 are connected in a welding mode of lining pipe hoops and screw threads, and the tensile strength is not lower than 75 percent of that of the mother pipe. In order to lay the freezing pipe 5 in the stratum at the top of the tunnel structure 1 at one time while drilling, the end part of a drill bit 51 of the freezing pipe is welded with the end part of the freezing pipe 5, the drill bit 51 is cut after the hole is drilled to the ground, and the freezing pipe 5 is reserved; after the freezing pipe 5 is finished, pressure testing is required. The test pressure is 2 times of the designed working pressure, and is not suitable to be lower than 0.80MPa. The pressure is tested for 30min and should not be reduced to exceed 0.05MPa, and the pressure is maintained to be qualified after being continued for 15 min. After the drilling construction of the freezing pipe 5 is finished, the plane position of the brine freezing equipment 4 is adjusted in time according to the actual hole opening position of the freezing pipe 5.

The brine freezing equipment 4 is arranged on the ground 6; the brine is conveyed to the position of a vertical hole drilling working face through a buried seamless steel pipe from the inside of the brine freezing equipment 4, a set of brine circulating system is installed on a left line and a right line to supply cold for freezing holes of the left line and the right line, and the inside of the brine freezing equipment 4 mainly comprises 3 freezing units, 1 brine tank, 2 brine pumps, 2 clear water pumps, 2 cooling towers, a plurality of power distribution control cabinets and the like.

In practical use, the utility model adopts secondary hole opening at the top of the shield tunnel, the freezing pipes 5 are synchronously erected during hole opening, the freezing pipes 5 are connected to the peripheral brine freezing equipment 4 after extending to the ground surface, and the top lead holes of the tunnel structure 1 are frozen; the utility model discloses compare and arrange in current station and freeze salt solution freezing equipment, tunnel and vertically freeze the pipe mode, can shorten by a wide margin and freeze pipe length, improve and freeze the work efficiency, reduce construction cost, arrange in comparing in the tunnel in addition and freeze salt solution equipment, tunnel and vertically freeze the pipe mode, can freeze the influence of equipment to other operations in the tunnel with salt solution and fall to minimumly.

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.

Step 2: a scaffold is erected in the tunnel structure 1, and an anti-gushing device 2 is arranged on the pipe piece structure to be perforated.

And step 3: and (5) repeatedly measuring the position of the hole, and arranging a frozen brine device 4 on the ground.

And 4, step 4: and drilling under the protection of the anti-gushing device 2, sequentially drilling the tunnel structure and the stratum till the ground 6, and connecting into a frozen brine device 4.

And 5: the drill bit 51 is cut on the ground, the freezing pipe 5 is reserved, and the freezing pipe 5 is communicated with the frozen brine equipment 4 on the ground after the pressure test meets the design requirement.

Other parts not described belong to the prior art.

Claims (6)

1. The utility model provides a linkage passageway freezes ejecting structure which characterized in that: the device comprises a blowout prevention device (2) arranged at the top of a tunnel structure (1), a communication channel (3) arranged between the two tunnel structures (1), a brine freezing device (4) arranged above the two tunnel structures (1), and a freezing pipe (5) with one end connected with the bottom of the tunnel structure (1) and the other end connected with the brine freezing device (4) after passing through the blowout prevention device (2) along the inner wall of the tunnel structure (1).

2. The connecting channel freezing and ejecting structure according to claim 1, wherein: 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 freezing pipe sealing device (23) sleeved on the orifice pipe (21).

3. The linked passage freezing ejection structure according to claim 2, wherein: one end of the freezing pipe (5) is connected with the bottom of the tunnel structure (1), the other end of the freezing pipe is detachably connected with a drill bit (51), and the drill bit (51) is detached after the freezing pipe (5) extends out of the ground (6).

4. A connecting passage freezing and ejecting structure according to claim 3, wherein: 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 connecting channel freezing and ejecting structure according to claim 4, wherein: the freezing pipe (5) is a low-carbon steel seamless steel pipe with the diameter of 108 mm multiplied by 8mm, the interfaces between pipe joints of the freezing 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 mother pipe.

6. The connecting channel freezing and ejecting structure according to claim 5, wherein: the brine freezing equipment (4) is installed on the ground (6).

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