CN212317993U - Rich water sand bed shield tunnel contact passage freezes implementation structure - Google Patents
Rich water sand bed shield tunnel contact passage freezes implementation structure Download PDFInfo
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- CN212317993U CN212317993U CN202021225581.6U CN202021225581U CN212317993U CN 212317993 U CN212317993 U CN 212317993U CN 202021225581 U CN202021225581 U CN 202021225581U CN 212317993 U CN212317993 U CN 212317993U
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Abstract
The utility model discloses a rich water sand layer shield tunnel contact passageway freezes realizes structure, the freezing station sets up in the top ground of contact passageway, it has the thru hole to bore between ground freezing station and shield tunnel, ground freezing station and tunnel are inside through thru hole installation frozen salt solution admission passage and frozen salt solution return circuit, through frozen salt solution admission passage and frozen salt solution return circuit with the frozen salt solution of ground freezing station introduce the hole in the freezing hole realize the hole level frozen salt solution circulation; and an electrical control cable of the ground freezing station is led into the tunnel through the through hole, so that the circulation, power transmission and water transmission of the horizontally frozen brine in the tunnel and the transmission of other living and production materials meeting the aperture are realized. In this way, the freezing station does not need to be rearranged in the hole, and the freezing saline system in the hole can be saved. Not only can avoid the energy loss caused by long conveying distance, but also is convenient for ventilation and heat dissipation, and improves the freezing effect.
Description
Technical Field
The utility model relates to an engineering construction technical field, concretely relates to technique that adopts freezing method construction shield tunnel contact passageway.
Background
The shield tunnel communication channel is generally arranged between a left tunnel and a right tunnel to form a channel between the two tunnels, and has the functions of communication, drainage, fire prevention and the like. During the construction of the shield tunnel communication channel, because the underground is about 20 meters, the underground water is abundant, the pressure is large, particularly in a poor stratum rich in water, the geological condition is soft silt geology generally, and the excavation process has large water and mud gushing risks. The construction is carried out after soil body reinforcement is carried out by adopting a freezing method in the prior art, a freezing station is required to be arranged in the freezing method, and the selected site is generally in a subway station ground square, a station underground station hall layer or a tunnel beside an access tunnel portal. When the freezing station is arranged on a ground square or a station hall layer, the freezing unit is far away from the communication channel (generally more than 500 m), the saline pipeline is long, the energy loss is large, and a large amount of heat preservation facilities are required to be input. The freezing station is arranged in the shield tunnel of the connection channel opening, the space of the shield tunnel is narrow, the occupied space of the freezing station is large, the arrangement is crowded, the cooling tower has poor heat dissipation effect in the hole, and meanwhile, the high-temperature water vapor discharging process generated by the cooling tower can influence the refrigeration effect of the soil body.
SUMMERY OF THE UTILITY MODEL
The utility model discloses shortcoming to prior art exists provides a structural design is more reasonable, with freezing station setting ground directly over the contact passageway, salt water pipeline, cable conductor transmit through the thru hole, reach and both can avoid the energy to cause a large amount of losses because of the transport distance is far away, be convenient for again ventilate, radiating rich water sand layer shield tunnel contact passageway freezes implementation structure.
In order to solve the technical problem, the utility model adopts the following technical scheme: the utility model provides a rich water sand layer shield tunnel contact passageway freezes implementation structure, and the contact passageway is the tunnel between the left side tunnel of shield tunnel and the right side tunnel, freezes implementation structure including freezing station, its characterized in that: the ground freezing station and the interior of the tunnel are connected with a pipeline system through the through holes to form a frozen brine inlet path and a frozen brine loop, and frozen brine of the ground freezing station is introduced into a freezing hole in the tunnel through the frozen brine inlet path and the frozen brine loop to realize horizontal frozen brine circulation in the tunnel; and the electrical control cables of the ground freezing station are introduced inside the tunnel through the through holes. The aperture of the through hole is not more than 300 mm.
The through holes are provided with a plurality of positions, and the electric control cable, the frozen saline water inlet circuit and the pipeline of the frozen saline water loop respectively penetrate through different through holes.
The device also comprises a through hole which is penetrated with a conduit for conveying materials, and the conduit can be used for conveying some production and living materials.
The frozen brine inlet path and the frozen brine loop respectively occupy at least two through holes, the pipelines of the frozen brine inlet paths are close together, and the pipelines of the frozen brine loops are also close together, so that the management of the construction process is facilitated.
The pipelines of the frozen brine inlet circuit and the frozen brine return circuit are both metal pipes, and the pipeline of the electric control cable is a plastic pipe or a rubber pipe.
The utility model discloses a drill out the thru hole between tunnel and ground, with ground freezing station salt solution through a plurality of thru holes introduce in the hole level freeze downthehole and in the hole freezes the hole, realize in the hole level freeze the salt solution circulation, still can realize transmitting electricity, water delivery and carry other life, production goods and materials that satisfy under this aperture. Therefore, freezing stations do not need to be rearranged in the tunnel, and freezing brine systems (such as 1 freezing unit, 1 brine circulating system, 1 set of cooling water circulating system and the like) in the tunnel can be saved. Therefore, a large amount of energy loss caused by long conveying distance can be avoided, ventilation and heat dissipation are facilitated, the freezing effect is improved, and meanwhile, the freezing station does not need to be arranged in the tunnel, so that the space in the tunnel is not occupied, and the orderly construction process is facilitated.
Drawings
FIG. 1 is a schematic cross-sectional view of a freezing implementation structure of the present invention;
FIG. 2 is a schematic view of the pipeline connection of the freezing implementation structure of the present invention;
FIG. 3 is a schematic illustration of a process for drilling a through hole;
FIG. 4 is a flow chart of the construction process.
In the figure, 1 is a left tunnel, 2 is a right tunnel, 3 is a communication channel, 4 is a through hole, 5 is a ground freezing station, 6 is a tunnel segment, 7 is a hole tube, 8 is a drill rod, 9 is an expansion screw, 10 is a valve, 11 is a gate valve, and 12 is a pressing device.
Detailed Description
In this embodiment, referring to fig. 1, fig. 2, and fig. 3, the water-rich sand layer shield tunnel communication channel freezing implementation structure, the communication channel 3 is a channel between the left tunnel 1 and the right tunnel 2 of the shield tunnel, and the freezing implementation structure includes a freezing station; the freezing station is arranged on the ground right above the communication channel 3 to form a ground freezing station 5, a through hole 4 is drilled between the ground freezing station 5 and the shield tunnel, the ground freezing station 5 and the inside of the tunnel are connected with a pipeline system through the through hole 4 to form a frozen brine inlet path and a frozen brine loop, and frozen brine of the ground freezing station 5 is introduced into a freezing hole in the tunnel through the frozen brine inlet path and the frozen brine loop to realize horizontal frozen brine circulation in the tunnel; and the electrical control cables of the ground freezing station 5 are led inside the tunnel through the through-holes 4.
The through holes 4 are provided with a plurality of positions, and the electric control cable, the frozen saline water inlet circuit and the pipeline of the frozen saline water loop are respectively penetrated through different through holes 4.
The device also comprises a through hole which is penetrated with a conduit for conveying materials, and the conduit can be used for conveying some production and living materials.
The frozen brine inlet path and the frozen brine loop respectively occupy at least two through holes, the pipelines of the frozen brine inlet paths are close together, and the pipelines of the frozen brine loops are also close together, so that the management of the construction process is facilitated.
The aperture of the through hole 4 is not more than 300 mm.
The pipelines of the frozen brine inlet circuit and the frozen brine return circuit are both metal pipes, and the pipeline of the electric control cable is a plastic pipe or a rubber pipe.
Referring to fig. 3 and 4, the construction process of the connection passage freezing realization structure of the water-rich sand layer shield tunnel is carried out according to the following steps,
positioning, perforating and orifice pipe device installation
1) Positioning the through hole opening position in the tunnel by using a theodolite according to the design, and positioning the opening on the tunnel segment 6 and a steel pipe segment (not shown) according to the hole position;
2) when the through holes are constructed on the tunnel segment 6, the orifice pipes 7 are installed firstly and firm, a sealing structure is arranged between the orifice pipes 7 and the tunnel segment 6, no leakage exists, and the orifice pipes 7 are provided with the valves 10 and the blowout preventers;
drilling through hole
A, adjusting the position of a drilling machine according to design requirements, fixing firmly, connecting a gate valve 11 to the orifice pipe 7, wherein the specification of the gate valve 11 is 1.5', and installing a drill bit of a drill rod 8 into the orifice pipe 7 from the gate valve 11; firstly, dry drilling is adopted, when drilling is strenuous and does not advance the ruler, water injection drilling is carried out from a drilling machine, meanwhile, a valve 10 is opened, the conditions of water outlet and sand outlet are observed, the slurry outlet amount is controlled by the valve 10, and the safety of the ground is ensured without sedimentation;
after each through hole 4 is finished, calculating the amount of the through hole effluent, and simultaneously combining the change of the surface settlement monitoring data to perform grouting in time;
in the drilling process, strictly monitoring the deflection condition by using a theodolite and a level, and timely correcting the deviation when the deflection is found;
c, after penetrating through the through hole 4, extending out of a ground through hole, extending out of the ground by not less than 1m, and temporarily sealing two ends of the through hole by using a plug;
d, installing a ground cold-falling station 5, penetrating pipelines for leading in and leading out frozen brine into corresponding through holes to be led into horizontal freezing holes in the tunnel, and leading the ground frozen brine into the freezing holes in the tunnel to realize circulation of the horizontal frozen brine in the tunnel;
e, an insulating pipeline is arranged in one through hole, and an electric control cable in the tunnel is led to the ground freezing station through the insulating pipeline, so that the overall construction electricity utilization problem is solved.
The orifice pipe 7 is firmly locked with the tunnel segment 6 by adopting an expansion screw 9. A hold-down device 12 is provided between the drill rod 8 and the gate valve 11 to position the drill rod 8.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the scope of the invention, i.e. the present invention is intended to cover all equivalent variations and modifications within the scope of the present invention.
Claims (6)
1. The utility model provides a rich water sand layer shield tunnel contact passageway freezes implementation structure, and the contact passageway is the tunnel between the left side tunnel of shield tunnel and the right side tunnel, freezes implementation structure including freezing station, its characterized in that: the ground freezing station and the interior of the tunnel are connected with a pipeline system through the through holes to form a frozen brine inlet path and a frozen brine loop, and frozen brine of the ground freezing station is introduced into a freezing hole in the tunnel through the frozen brine inlet path and the frozen brine loop to realize horizontal frozen brine circulation in the tunnel; and the electrical control cables of the ground freezing station are introduced inside the tunnel through the through holes.
2. The structure for realizing freezing of the communication channel of the shield tunnel of the water-rich sand layer according to claim 1, is characterized in that: the through holes are provided with a plurality of positions, and the electric control cable, the frozen saline water inlet circuit and the pipeline of the frozen saline water loop respectively penetrate through different through holes.
3. The structure for realizing freezing of the communication channel of the shield tunnel of the water-rich sand layer according to claim 1, is characterized in that: also comprises a through hole which is penetrated with a conduit and used for conveying materials.
4. The structure for realizing freezing of the communication channel of the shield tunnel of the water-rich sand layer according to claim 1, is characterized in that: the frozen brine inlet path and the frozen brine loop respectively occupy at least two through holes, and the pipelines of the frozen brine inlet paths are closely connected together, and the pipelines of the frozen brine loops are also closely connected together.
5. The structure for realizing freezing of the communication channel of the shield tunnel of the water-rich sand layer according to claim 1, is characterized in that: the aperture of the through hole is not more than 300 mm.
6. The structure for realizing freezing of the communication channel of the shield tunnel of the water-rich sand layer according to claim 1, is characterized in that: the pipelines of the frozen brine inlet circuit and the frozen brine return circuit are both metal pipes, and the pipeline of the electric control cable is a plastic pipe or a rubber pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021225581.6U CN212317993U (en) | 2020-06-29 | 2020-06-29 | Rich water sand bed shield tunnel contact passage freezes implementation structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021225581.6U CN212317993U (en) | 2020-06-29 | 2020-06-29 | Rich water sand bed shield tunnel contact passage freezes implementation structure |
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| Publication Number | Publication Date |
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| CN212317993U true CN212317993U (en) | 2021-01-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021225581.6U Active CN212317993U (en) | 2020-06-29 | 2020-06-29 | Rich water sand bed shield tunnel contact passage freezes implementation structure |
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| CN (1) | CN212317993U (en) |
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2020
- 2020-06-29 CN CN202021225581.6U patent/CN212317993U/en active Active
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