CN111550251A - Structure for realizing freezing of contact channel of shield tunnel of water-rich sand layer and construction process - Google Patents
Structure for realizing freezing of contact channel of shield tunnel of water-rich sand layer and construction process Download PDFInfo
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- CN111550251A CN111550251A CN202010603131.4A CN202010603131A CN111550251A CN 111550251 A CN111550251 A CN 111550251A CN 202010603131 A CN202010603131 A CN 202010603131A CN 111550251 A CN111550251 A CN 111550251A
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- tunnel
- freezing
- hole
- frozen brine
- water
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Links
- 238000007710 freezing Methods 0.000 title claims abstract description 66
- 230000008014 freezing Effects 0.000 title claims abstract description 66
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000004576 sand Substances 0.000 title claims abstract description 20
- 238000010276 construction Methods 0.000 title claims abstract description 19
- 239000012267 brine Substances 0.000 claims abstract description 56
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims abstract description 56
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 9
- 239000011780 sodium chloride Substances 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 7
- 238000005553 drilling Methods 0.000 claims description 23
- 238000004891 communication Methods 0.000 claims description 15
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 238000004062 sedimentation Methods 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 230000017525 heat dissipation Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000009423 ventilation Methods 0.000 abstract description 3
- 238000001816 cooling Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/14—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by boring or drilling
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/14—Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
- E21F1/006—Ventilation at the working face of galleries or tunnels
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F13/00—Transport specially adapted to underground conditions
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/04—Distributing means for power supply in mines
- E21F17/06—Distributing electric power; Cable networks; Conduits for cables
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Power Engineering (AREA)
- Soil Sciences (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a structure for realizing freezing of a shield tunnel connecting channel of a water-rich sand layer and a construction process, wherein a freezing station is arranged on the ground above the connecting channel, a through hole is drilled between the ground freezing station and the shield tunnel, a frozen brine inlet passage and a frozen brine loop are arranged in the ground freezing station and the tunnel through the through hole, and frozen brine of the ground freezing station is introduced into a freezing hole in a tunnel through the frozen brine inlet passage and the frozen brine loop to realize horizontal frozen brine circulation in the tunnel; 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 invention relates to the technical field of engineering construction, in particular to a technology for constructing a shield tunnel connection channel by adopting a freezing method.
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.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the water-rich sand layer shield tunnel connection channel freezing realization structure and the construction process, wherein the structure design is more reasonable, the freezing station is arranged on the ground right above the connection channel, and the saline pipeline and the cable are transmitted through the through holes, so that the purpose of avoiding a large amount of energy loss caused by long transmission distance and facilitating ventilation and heat dissipation is achieved.
In order to solve the technical problems, the invention 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 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 aperture of the through hole 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.
The utility model provides a construction technology that rich water sand bed shield tunnel contact passageway freezes realization structure which characterized in that: the method comprises the following steps of (1),
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 and the steel tube segment according to the hole position;
2) when the through holes are constructed on the tunnel duct piece, the orifice pipes are installed and firm, a sealing structure is arranged between the orifice pipes and the duct piece, no leakage exists, and the orifice pipes are provided with valves and blowout preventers;
drilling through hole
A, adjusting the position of a drilling machine according to design requirements, fixing firmly, connecting a gate valve to an orifice pipe, wherein the specification of the gate valve is 1.5', and installing a drill bit of a drill rod into the orifice pipe from the gate valve; firstly, dry drilling is adopted, when drilling is strenuous and does not advance the ruler, water injection drilling is carried out on a drilling machine, meanwhile, a valve is opened, the conditions of water outlet and sand outlet are observed, the slurry outlet amount is controlled by using the switch of the valve, and the safety of the ground is ensured without sedimentation;
calculating the amount of the through hole effluent after each through hole is finished, and simultaneously combining the change of the surface settlement monitoring data and grouting in time;
in the drilling process, a theodolite and a level are adopted to strictly monitor the deflection condition, and the deviation is corrected in time when the deflection is found;
c, after penetrating through the 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, 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, an electric control cable in the tunnel is led to the ground freezing station through the insulating pipeline, and a ground power supply can be led to the tunnel, so that the overall construction electricity utilization problem is solved.
The orifice pipe is firmly locked with the tunnel segment by adopting an expansion screw. And a pressing device is arranged between the drill rod and the gate valve so as to position the drill rod.
The invention realizes the circulation of the horizontally frozen brine in the hole by drilling the through holes between the tunnel and the ground and introducing the brine of the ground freezing station into the horizontally frozen hole in the hole and the frozen hole in the hole through the plurality of through holes, and can also realize power transmission, water transmission and other transportation of living and production materials meeting the requirements under the hole diameter. 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 of the present invention;
FIG. 2 is a schematic diagram of the piping connections of the freezing implementation 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 (a ground power supply can also be led into the tunnel), 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 present invention has been described in detail, and it should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Claims (9)
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.
7. The utility model provides a construction technology that rich water sand bed shield tunnel contact passageway freezes realization structure which characterized in that: the method comprises the following steps of (1),
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 and the steel tube segment according to the hole position;
2) when the through holes are constructed on the tunnel duct piece, the orifice pipes are installed and firm, a sealing structure is arranged between the orifice pipes and the duct piece, no leakage exists, and the orifice pipes are provided with valves and blowout preventers;
drilling through hole
A, adjusting the position of a drilling machine according to design requirements, fixing firmly, connecting a gate valve on an orifice pipe, and installing a drill bit of a drill rod into the orifice pipe from the gate valve; firstly, dry drilling is adopted, when drilling is strenuous and does not advance the ruler, water injection drilling is carried out on a drilling machine, meanwhile, a valve is opened, the conditions of water outlet and sand outlet are observed, the slurry outlet amount is controlled by using the switch of the valve, and the safety of the ground is ensured without sedimentation;
calculating the amount of the through hole effluent after each through hole is finished, and simultaneously combining the change of the surface settlement monitoring data and grouting in time;
in the drilling process, a theodolite and a level are adopted to strictly monitor the deflection condition, and the deviation is corrected in time when the deflection is found;
c, the through hole penetrates through the ground, and the temporary seals at two ends are sealed by adopting the pipe plugs;
d, installing a ground cold-falling station, 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, an electric control cable in the tunnel is led to the ground freezing station through the insulating pipeline, or a ground power supply is led to the tunnel, and the overall construction electricity utilization problem is solved.
8. The construction process for realizing the structure of the shield tunnel communication passage of the water-rich sand layer according to claim 7, which is characterized in that: the orifice pipe is firmly locked with the tunnel segment by adopting an expansion screw.
9. The construction process for realizing the structure of the shield tunnel communication passage of the water-rich sand layer according to claim 7, which is characterized in that: and a pressing device is arranged between the drill rod and the gate valve so as to position the drill rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010603131.4A CN111550251A (en) | 2020-06-29 | 2020-06-29 | Structure for realizing freezing of contact channel of shield tunnel of water-rich sand layer and construction process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010603131.4A CN111550251A (en) | 2020-06-29 | 2020-06-29 | Structure for realizing freezing of contact channel of shield tunnel of water-rich sand layer and construction process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111550251A true CN111550251A (en) | 2020-08-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010603131.4A Pending CN111550251A (en) | 2020-06-29 | 2020-06-29 | Structure for realizing freezing of contact channel of shield tunnel of water-rich sand layer and construction process |
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| CN (1) | CN111550251A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113153322A (en) * | 2021-04-01 | 2021-07-23 | 中铁七局集团郑州工程有限公司 | Shield horizontal freezing starting construction method under existing operation subway |
| CN113530445A (en) * | 2021-08-04 | 2021-10-22 | 南京林业大学 | Super-long horizontal freezing hole deviation-preventing drilling system and construction method thereof |
-
2020
- 2020-06-29 CN CN202010603131.4A patent/CN111550251A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113153322A (en) * | 2021-04-01 | 2021-07-23 | 中铁七局集团郑州工程有限公司 | Shield horizontal freezing starting construction method under existing operation subway |
| CN113153322B (en) * | 2021-04-01 | 2024-02-23 | 中铁七局集团郑州工程有限公司 | Shield horizontal freezing originating construction method under existing operation subway |
| CN113530445A (en) * | 2021-08-04 | 2021-10-22 | 南京林业大学 | Super-long horizontal freezing hole deviation-preventing drilling system and construction method thereof |
| CN113530445B (en) * | 2021-08-04 | 2023-09-15 | 南京林业大学 | Super-long horizontal freezing hole deflection-prevention drilling system and construction method thereof |
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