CN113833488A - Subway tunnel connection channel construction method - Google Patents
Subway tunnel connection channel construction method Download PDFInfo
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- CN113833488A CN113833488A CN202110869902.9A CN202110869902A CN113833488A CN 113833488 A CN113833488 A CN 113833488A CN 202110869902 A CN202110869902 A CN 202110869902A CN 113833488 A CN113833488 A CN 113833488A
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- 238000010276 construction Methods 0.000 title claims abstract description 27
- 230000008014 freezing Effects 0.000 claims abstract description 75
- 238000007710 freezing Methods 0.000 claims abstract description 75
- 238000004891 communication Methods 0.000 claims abstract description 43
- 239000002689 soil Substances 0.000 claims abstract description 35
- 239000010410 layer Substances 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000001816 cooling Methods 0.000 claims abstract description 14
- 230000002093 peripheral effect Effects 0.000 claims abstract description 10
- 230000008018 melting Effects 0.000 claims abstract description 4
- 238000002844 melting Methods 0.000 claims abstract description 4
- 230000002265 prevention Effects 0.000 claims abstract description 4
- 239000002344 surface layer Substances 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 49
- 239000012530 fluid Substances 0.000 claims description 42
- 239000004568 cement Substances 0.000 claims description 27
- 239000002002 slurry Substances 0.000 claims description 27
- 239000000110 cooling liquid Substances 0.000 claims description 21
- 238000007789 sealing Methods 0.000 claims description 19
- 238000009826 distribution Methods 0.000 claims description 18
- 230000000149 penetrating effect Effects 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 239000003507 refrigerant Substances 0.000 claims description 6
- 230000003014 reinforcing effect Effects 0.000 claims description 6
- 238000005553 drilling Methods 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- 239000012267 brine Substances 0.000 claims description 2
- 239000006185 dispersion Substances 0.000 claims description 2
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 5
- 235000017491 Bambusa tulda Nutrition 0.000 description 5
- 241001330002 Bambuseae Species 0.000 description 5
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 5
- 239000011425 bamboo Substances 0.000 description 5
- 239000011440 grout Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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Classifications
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- 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
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- 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
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (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 subway tunnel contact channel construction method which is characterized by comprising the following steps of: A. forming an anti-collapse leakage barrel surrounding the periphery of the soil body area of the building communication channel, wherein the anti-collapse leakage barrel is an ice layer formed by cooling and freezing the soil body of the peripheral road of the soil body area of the building communication channel; B. forming a communication channel: digging out a soil body in the inner area of the collapse prevention leakage cylinder to form a communication channel for communicating two subway tunnels, and forming a supporting surface layer on the peripheral surface of the communication channel; C. unfreezing: and stopping cooling the frozen layer, and naturally melting and unfreezing the frozen layer. The invention provides a construction method of a subway tunnel connection channel, which can effectively prevent collapse leakage in the connection channel construction process, and solves the problem that collapse leakage is easy to generate in the construction process when the existing subway connection channel is built on a wet soft soil body.
Description
Technical Field
The application relates to the technical field of underground subway construction, in particular to a subway tunnel contact channel construction method.
Background
In the construction process of the subway, a communication channel for communicating two subway tunnels (an uplink tunnel and a downlink tunnel) of the subway needs to be built between the two subway tunnels. When the address of the area where the contact channel is located is a wet and soft soil body such as a mucky soil body, collapse and water seepage phenomena can be generated when the contact channel is excavated, so that the contact channel is difficult to construct.
Disclosure of Invention
The invention provides a construction method of a subway tunnel connection channel, which can effectively prevent collapse leakage in the connection channel construction process, and solves the problem that collapse leakage is easy to generate in the construction process when the existing subway connection channel is built on a wet soft soil body.
In order to achieve the purpose, the invention adopts the following technical scheme: a subway tunnel connection channel construction method is characterized by comprising the following steps: A. forming an anti-collapse leakage barrel surrounding the periphery of the soil body area of the building communication channel, wherein the anti-collapse leakage barrel is an ice layer formed by cooling and freezing the soil body of the peripheral road of the soil body area of the building communication channel; B. forming a communication channel: digging out a soil body in the inner area of the collapse prevention leakage cylinder to form a communication channel for communicating two subway tunnels, and forming a supporting surface layer on the peripheral surface of the communication channel; C. unfreezing: and stopping cooling the frozen layer, and naturally melting and unfreezing the frozen layer. According to the technical scheme, the rigid sealed collapse-prevention leakage barrel is formed by freezing the periphery of the soil body area of the building communication channel, so that the collapse-prevention effect is achieved, and the rigid sealed collapse-prevention leakage barrel is formed by freezing and hardening and cannot generate a water seepage phenomenon.
Preferably, in the step a, the temperature reduction is performed by: drilling a plurality of freezing holes distributed along the circumferential direction of the communication channel from the soil around the soil area of the building communication channel in the subway tunnel, wherein the freezing holes are blind holes, and refrigerating fluid circulating heat exchange pipelines are inserted into the freezing holes, so that refrigerating fluid below zero flows through the refrigerating fluid circulating heat exchange pipelines to realize cooling and freezing of the soil around the soil area of the building communication channel; and B, after the step B, taking out the cooling liquid circulating heat exchange pipeline and injecting cement slurry into the freezing hole for solidification to form a reinforcing rib for reinforcing the communication channel. Provides a specific technical scheme for freezing, and can improve the strength of a plug connecting channel after construction is finished so as to preferably prevent collapse.
Preferably, the freezing hole is an inclined hole with an inner end inclined in a direction away from the communication channel, and a rigid tunnel protection wall is built in the subway tunnel before the freezing hole. Can guarantee when being located the limited subway tunnel of construction that the multirow that can not drill out and freeze the hole along preventing the thick direction of collapse leakage section of thick bamboo wall distributes that the wall thickness in middle part of the leakage section of thick bamboo that collapses is thicker, can construct with the help of the rigid tunnel dado and improve the wall thickness of preventing the leakage section of thick bamboo that collapses and support the dustproof production of ear and collapse to preventing the leakage section of thick bamboo that collapses.
Preferably, the freezing fluid is brine. The freezing liquid can be ensured to be below zero temperature when the freezing liquid is input into the freezing liquid hole on the premise of low cost so as to ensure that water in the soil body is frozen and hardened.
Preferably, the refrigerating fluid circulating heat exchange pipeline comprises an outer pipe and an inner pipe positioned in the outer pipe, the outer pipe comprises a pipe body, an inner end wall and an outer end wall, the pipe body is of a heat conduction structure, the inner end wall is provided with an inner pipe type connector, the outer end wall is provided with an outer pipe type connector, the outer surface of the outer end wall is provided with a refrigerating fluid outlet communicated with the inner space of the outer pipe type connector and a refrigerating fluid inlet communicated with the space enclosed by the inner pipe and the outer pipe, one end of the inner pipe is connected with the inner pipe type connector, the other end of the inner pipe is connected with the outer pipe type connector, and a plurality of communicating holes communicated with the inner space and the outer space of the inner pipe type connector are formed in the circumferential surface of the inner pipe type connector; during freezing, refrigerating fluid flows into a space defined by the inner pipe and the outer pipe through the refrigerating fluid inflow port, then flows into the inner pipe through the communicating hole, and then flows out from the outer pipe type connector and the refrigerating fluid outflow port. The technical scheme of the refrigerating fluid circulating heat exchange pipeline is provided, and water separation walking back and forth in the same pipeline can be guaranteed.
Preferably, the communication holes are distributed along the circumferential direction of the inner pipe type connector, an annular liquid distribution cavity extending along the circumferential direction of the outer pipe type connector is arranged in the outer end wall, the refrigerating liquid inflow port is communicated with the annular liquid distribution cavity, and the annular liquid distribution cavity is provided with a plurality of flow dispersing holes which are distributed along the circumferential direction of the annular liquid distribution cavity and penetrate through the inner end face of the outer end wall; when in freezing, the refrigerating fluid enters the annular liquid distribution cavity through the refrigerating fluid inlet and then flows into a space enclosed by the inner pipe and the outer pipe from the flow dispersing holes. The uniformity of liquid inlet can be improved, and the influence of a static flow area on the freezing efficiency is prevented.
Preferably, an opening direction of an inner port of the refrigerating fluid inlet port is a radial direction of the annular liquid distribution chamber. The uniformity of the liquid feeding can be further improved.
Preferably, the inner end wall and the outer end wall are detachably connected with the pipe body, and the inner pipe is of a flexible structure; the outer pipe type connector is provided with an outer pipe type connector head flanging penetrating through the inner pipe, an outer end annular cavity extending along the circumferential direction of the inner pipe is arranged in the wall part of the outer end of the inner pipe, an outer end part strapping rope for fixing the inner pipe on the outer pipe type connector penetrates through the outer end part annular cavity, an outer end part operating hole penetrating through the outer surface of the inner pipe is formed in the outer end part annular cavity, and two ends of the outer end part strapping rope are tied together to form a rope knot located at the outer end part operating hole; the inner pipe type connector is provided with an inner pipe type connector end flanging penetrating through the inner pipe, an inner end annular cavity extending along the circumferential direction of the inner pipe is arranged in the wall portion of the inner end of the inner pipe, an inner end binding rope fixing the inner pipe on the inner pipe type connector penetrates through the inner end annular cavity, an inner end part operation hole penetrating through the outer surface of the inner pipe is formed in the inner end annular cavity, and two ends of the inner end binding rope are tied together to form a rope knot located at the inner end part operation hole. The inner pipe and the outer pipe are fixed conveniently, the connection reliability is good, and the manufacture is convenient.
Preferably, the pipe body is formed by splicing a plurality of pipe sections, adjacent pipe sections are connected together in a sealing mode through annular sealing rings extending along the circumferential direction of the pipe sections, each annular sealing ring is of a hollow structure, and water is filled in each annular sealing ring. The annular sealing ring can be further expanded from the inside in the freezing process by virtue of the characteristic of water freezing volume change, so that the sealing reliability is improved. Due to the adoption of the multi-section structure, the construction can be carried out when the subway tunnel connection channel construction method is limited by the diameter of the subway tunnel.
Preferably, the two ends of the pipe sections are provided with internal thread sections, adjacent pipe sections are connected together through the internal thread sections in a threaded mode through external thread connecting rings, and the annular sealing rings are located between the end faces of the two adjacent pipe sections and clamped by the two adjacent pipe sections. The smoothness of the outer peripheral surface can be guaranteed to be communicated, and the refrigerating fluid circulating heat exchange pipeline is labor-saving and smooth when being pulled out.
Preferably, the inner tube is of a flexible structure, the inner end wall penetrates through the tube body, the tube body is provided with a plurality of tube body connecting holes distributed along the circumferential direction of the tube body, the circumferential surface of the inner end wall is provided with a plurality of end wall connecting holes distributed along the circumferential direction of the inner end wall, the tube body connecting holes are internally provided with connecting pins and springs for driving the connecting pins to be inserted into the end wall connecting holes, the connecting pins and the end wall connecting holes are connected together in a sliding and sealing manner, the inner end wall is internally provided with a liquid flow channel for communicating the inner space of the inner tube with the end wall connecting holes, and when the inner tube is in a stretched state, the end wall connecting holes are positioned outside the tube body and the inner end wall still penetrates through the tube body; the method for pulling out the cooling liquid circulating heat exchange pipeline and injecting cement slurry into the freezing hole comprises the following steps of 1, unfreezing the cooling liquid circulating heat exchange pipeline and the freezing layer and separating the cooling liquid circulating heat exchange pipeline from the freezing layer until the cooling liquid circulating heat exchange pipeline can move in the freezing hole; 2. pressurizing the space enclosed by the inner pipe and the outer pipe or the liquid in the inner pipe to make the connecting pin be separated from the end wall part; 3. injecting liquid into a space defined by the inner tube and the outer tube, and pressurizing and extruding the liquid until the inner tube is straightened, wherein the end wall connecting hole is positioned outside the tube body as a result of straightening the inner tube; 4. and cement slurry is injected into the inner pipe, the cement slurry flows out of the freezing hole through the liquid flow channel and the end wall connecting hole, and the cement slurry is filled into the freezing hole and drives the cooling liquid circulating heat exchange pipeline to move towards the outside of the freezing hole as a result of the cement slurry flowing out of the freezing hole. The refrigerating fluid circulating heat exchange pipeline can be driven to be pulled out by means of the reaction during grouting, so that labor is saved and convenience is brought to pulling out. Grout is injected through the inner pipe, and the grout in the refrigerating fluid circulating heat exchange pipeline is discharged conveniently and quickly after the grout is injected.
Preferably, when the pipe body is formed by a plurality of sections of pipe sections and the space interference cooling liquid circulation heat exchange pipeline of the subway tunnel is integrally pulled out, the step 4 comprises the following steps: 4.1, injecting cement slurry into the inner pipe until the pipe section at the outermost end extends out of the freezing hole, and then taking the pipe section at the outermost end; 4.2, connecting the outer end wall to the outer end of the pipe section at the secondary outer end, injecting cement slurry into the inner pipe until the pipe section at the secondary outer end extends out of the freezing hole, taking off the pipe section at the secondary outer end, enabling the inner end wall to move and penetrate through the pipe body by pulling the inner pipe before the cement slurry is solidified, enabling the end wall connecting hole to be positioned outside the pipe body, and taking off the pipe section at the secondary outer end; the remaining pipe section is removed in the same way as in step 4.2.
Preferably, the inner pipe has a heat insulating structure. The efficiency of the leakage section of thick bamboo that collapses is formed in the cooling can be improved.
The invention has the following beneficial effects: collapse and leakage cannot be generated when the subway communication channel is a member in the wet soft soil, so that the safety during construction is improved, and the construction can be smoothly carried out.
Drawings
FIG. 1 is a sectional view showing a freezing arrangement in the course of the construction of the present invention;
FIG. 2 is a schematic sectional view A-A of FIG. 1;
FIG. 3 is a schematic diagram of a refrigerant fluid circulating heat exchange line in the present invention;
FIG. 4 is an enlarged schematic view of the inner end of the refrigerant fluid circulating heat exchange tubes, i.e., the right end of FIG. 3;
fig. 5 is a partially enlarged schematic view at B of fig. 4;
FIG. 6 is an enlarged schematic view of the outer end of the refrigerant fluid circulating heat exchange tubes, i.e., the left end of FIG. 3;
FIG. 7 is an enlarged partial schematic view at C of FIG. 6;
FIG. 8 is an enlarged partial schematic view at D of FIG. 3;
fig. 9 is a partially enlarged schematic view at E of fig. 8.
In the figure: a communication channel 1, a collapse-proof leakage cylinder 2, a freezing hole 3, an inner pipe 5, a pipe body 6, an inner end wall 7, an outer end wall 8, an inner pipe type connector 9, an outer pipe type connector 10, a freezing liquid outlet 11, a freezing liquid inlet 12, a communication hole 13, an annular liquid distribution cavity 14, a flow dispersion hole 15, an outer pipe type connecting head flanging 16, an outer end annular cavity 17, an outer end binding rope 18, an outer end working hole 19, a knot 20 formed by tying together two ends of the outer end binding rope, an inner pipe type connecting head flanging 21, an inner end annular cavity 22, an inner end binding rope 23, an inner end working hole 24, a knot 25 formed by tying together two ends of the inner end binding rope, a pipe section 26, an annular sealing ring seal 27, water 28, an inner thread section 29, a pipe body connecting hole 30, an end wall connecting hole 31, a connecting pin 32, a spring 33, a liquid flow channel 34, a pipe section 35 of the most pipe section, a liquid flow channel, A pipe section 36 at the secondary outer end, a subway tunnel 37 and an external thread connecting ring 4.
Detailed Description
The invention is further illustrated with reference to the figures and the specific embodiments.
Referring to fig. 1 to 9, a subway tunnel connection passage construction method includes the steps of: A. forming an anti-collapse leakage barrel 2 surrounding the periphery of the soil body area of the building communication channel 1, wherein the anti-collapse leakage barrel is an ice layer formed by cooling and freezing the soil body of the peripheral channels of the soil body area of the building communication channel; B. forming a communication channel: digging out a soil body in the inner area of the collapse prevention leakage cylinder to form a communication channel for communicating the two subway tunnels 37, and forming a supporting surface layer on the peripheral surface of the communication channel; C. unfreezing: and stopping cooling the frozen layer, and naturally melting and unfreezing the frozen layer.
In the step A, the method for cooling comprises the following steps: drilling a plurality of freezing holes 3 distributed along the circumferential direction of the communication channel from the soil around the soil area of the building communication channel in the subway tunnel, wherein the freezing holes are blind holes, and refrigerating fluid circulating heat exchange pipelines are inserted into the freezing holes, so that the refrigerating fluid below zero flows through the refrigerating fluid circulating heat exchange pipelines to realize cooling and freezing of the soil around the soil area of the building communication channel; and B, after the step B, taking out the cooling liquid circulating heat exchange pipeline and injecting cement slurry into the freezing hole for solidification to form a reinforcing rib for reinforcing the communication channel. The freezing holes are inclined holes with inner ends inclined towards the direction far away from the communication channel, and rigid tunnel protecting walls are built in the subway tunnel before the freezing holes. The refrigerating fluid is saline.
The refrigerating fluid circulation heat exchange pipeline comprises an outer pipe and an inner pipe 5 positioned in the outer pipe, and the outer pipe is a stainless steel pipe. The outer tube comprises a tube body 6, an inner end wall 7 and an outer end wall 8. The pipe body is of a heat conduction structure, an inner pipe type connector 9 is arranged on the inner end wall of the pipe body, an outer pipe type connector 10 is arranged on the outer end wall of the pipe body, a refrigerating fluid outlet 11 communicated with the inner space of the outer pipe type connector and a refrigerating fluid inlet 12 communicated with the space enclosed by the inner pipe and the outer pipe are arranged on the outer surface of the outer end wall of the pipe body, one end of the inner pipe is connected with the inner pipe type connector, the other end of the inner pipe is connected with the outer pipe type connector, and a plurality of communicating holes 13 communicated with the inner space and the outer space of the inner pipe type connector are formed in the circumferential surface of the inner pipe type connector; during freezing, refrigerating fluid flows into a space defined by the inner pipe and the outer pipe through the refrigerating fluid inflow port, then flows into the inner pipe through the communicating hole, and then flows out from the outer pipe type connector and the refrigerating fluid outflow port. The refrigerating fluid is circularly cooled by the water chiller. The intercommunicating pores are distributed along the circumferential direction of the inner pipe type connector, an annular liquid distribution cavity 14 extending along the circumferential direction of the outer pipe type connector is arranged in the outer end wall, a refrigerating liquid inflow port is communicated with the annular liquid distribution cavity, and the annular liquid distribution cavity is provided with a plurality of flow dispersing holes 15 which are distributed along the circumferential direction of the annular liquid distribution cavity and penetrate through the inner end surface of the outer end wall; when in freezing, the refrigerating fluid enters the annular liquid distribution cavity through the refrigerating fluid inlet and then flows into a space enclosed by the inner pipe and the outer pipe from the flow dispersing holes. The opening direction of the inner port of the refrigerating fluid inflow port is the radial direction of the annular liquid distribution cavity. The inner end wall and the outer end wall are detachably connected with the pipe body, and the outer end wall is in threaded connection with the inside of the pipe body. The inner pipe is of a flexible structure; the outer pipe type connector is provided with an outer pipe type connector head flanging 16 penetrating through the inner pipe, an outer end annular cavity 17 extending along the circumferential direction of the inner pipe is arranged in the wall part of the outer end of the inner pipe, an outer end binding rope 18 fixing the inner pipe on the outer pipe type connector is penetrated through the outer end annular cavity, an outer end operating hole 19 penetrating through the outer surface of the inner pipe is arranged in the outer end annular cavity, and a knot 20 formed by binding the two ends of the outer end binding rope together is positioned at the outer end operating hole; the inner pipe type connector is provided with an inner pipe type connector head flanging 21 penetrating through the inner pipe, an inner end annular cavity 22 extending along the circumferential direction of the inner pipe is arranged in the wall part of the inner end of the inner pipe, an inner end binding rope 23 fixing the inner pipe on the inner pipe type connector penetrates through the inner end annular cavity, an inner end part operation hole 24 penetrating through the outer surface of the inner pipe is arranged in the inner end annular cavity, and a knot 25 formed by tying the two ends of the inner end binding rope together is positioned at the inner end part operation hole. The pipe body is formed by splicing a plurality of pipe sections 26, adjacent pipe sections are connected together in a sealing mode through annular sealing rings 27 extending along the circumferential direction of the pipe sections, the annular sealing rings are of hollow structures, and water 28 is filled in the annular sealing rings. The two ends of the pipe sections are provided with internal thread sections 29, the adjacent pipe sections are connected together by the internal thread sections being in threaded connection with the external thread connecting ring 4, and the annular sealing ring is positioned between the end surfaces of the two adjacent pipe sections and is clamped by the two adjacent pipe sections. The inner end wall penetrates through the tube body, a plurality of tube body connecting holes 30 distributed along the circumferential direction of the tube body are formed in the tube body, a plurality of end wall connecting holes 31 distributed along the circumferential direction of the inner end wall are formed in the circumferential surface of the inner end wall, a connecting pin 32 and a spring 33 for driving the connecting pin to be inserted into the end wall connecting holes are arranged in the tube body connecting holes, the connecting pin and the end wall connecting holes are connected together in a sliding and sealing mode, a liquid flow channel 34 for communicating the inner space of the inner tube with the end wall connecting holes is formed in the inner end wall, the end wall connecting holes are located outside the tube body when the inner tube is in a stretched state, and the inner end wall still penetrates through the tube body; the method for pulling out the cooling liquid circulating heat exchange pipeline and injecting cement slurry into the freezing hole comprises the following steps of 1, unfreezing and separating the cooling liquid circulating heat exchange pipeline and a freezing layer (specifically, enabling hot water to enter the cooling liquid circulating heat exchange pipeline for heating and unfreezing) until the cooling liquid circulating heat exchange pipeline can move in the freezing hole; 2. pressurizing the space enclosed by the inner pipe and the outer pipe or the liquid in the inner pipe to make the connecting pin be separated from the end wall part; 3. injecting liquid into a space defined by the inner tube and the outer tube, and pressurizing and extruding the liquid until the inner tube is straightened, wherein the end wall connecting hole is positioned outside the tube body as a result of straightening the inner tube; 4. and cement slurry is injected into the inner pipe, the cement slurry flows out of the freezing hole through the liquid flow channel and the end wall connecting hole, and the cement slurry is filled into the freezing hole and drives the cooling liquid circulating heat exchange pipeline to move towards the outside of the freezing hole as a result of the cement slurry flowing out of the freezing hole. In the invention, when the pipe body is formed by a plurality of sections of pipe sections and the space interference cooling liquid circulation heat exchange pipeline of the subway tunnel is integrally pulled out, the step 4 comprises the following steps: 4.1, injecting cement slurry into the inner pipe until the outermost pipe section extends out of the freezing hole, and then taking down the outermost pipe section 35; 4.2, connecting the outer end wall to the outer end of the pipe section 36 at the secondary outer end, injecting cement slurry into the inner pipe until the pipe section at the secondary outer end extends out of the freezing hole, taking off the pipe section at the secondary outer end, pulling the inner pipe before the cement slurry is cured to enable the inner end wall to move to penetrate through the pipe body, enabling the end wall connecting hole to be positioned outside the pipe body, and taking off the pipe section at the secondary outer end; the remaining pipe section is removed in the same way as in step 4.2. The inner pipe is of a heat insulation structure.
Claims (10)
1. A subway tunnel connection channel construction method is characterized by comprising the following steps: A. forming an anti-collapse leakage barrel surrounding the periphery of the soil body area of the building communication channel, wherein the anti-collapse leakage barrel is an ice layer formed by cooling and freezing the soil body of the peripheral road of the soil body area of the building communication channel; B. forming a communication channel: digging out a soil body in the inner area of the collapse prevention leakage cylinder to form a communication channel for communicating two subway tunnels, and forming a supporting surface layer on the peripheral surface of the communication channel; C. unfreezing: and stopping cooling the frozen layer, and naturally melting and unfreezing the frozen layer.
2. A method for constructing a subway tunnel connection passage as claimed in claim 1, wherein in said step a, the method for cooling is: drilling a plurality of freezing holes distributed along the circumferential direction of the communication channel from the soil around the soil area of the building communication channel in the subway tunnel, wherein the freezing holes are blind holes, and refrigerating fluid circulating heat exchange pipelines are inserted into the freezing holes, so that refrigerating fluid below zero flows through the refrigerating fluid circulating heat exchange pipelines to realize cooling and freezing of the soil around the soil area of the building communication channel; and B, after the step B, taking out the cooling liquid circulating heat exchange pipeline and injecting cement slurry into the freezing hole for solidification to form a reinforcing rib for reinforcing the communication channel.
3. A method as claimed in claim 2, wherein the freezing holes are inclined holes having inner ends inclined in a direction away from the connecting passage, and a rigid tunnel protection wall is built in the subway tunnel before the freezing holes.
4. A subway tunnel communication passage construction method as claimed in claim 1, 2 or 3, wherein said freezing liquid is brine.
5. A subway tunnel connection channel construction method as claimed in claim 2 or 3, wherein said refrigerant liquid circulation heat exchange pipeline comprises an outer pipe and an inner pipe located in the outer pipe, said outer pipe comprises a pipe body, an inner end wall and an outer end wall, said pipe body is of a heat conducting structure, said inner end wall is provided with an inner pipe type connector, said outer end wall is provided with an outer pipe type connector, the outer surface of said outer end wall is provided with a refrigerant liquid outlet communicated with the inner space of the outer pipe type connector and a refrigerant liquid inlet communicated with the space enclosed by the inner pipe and the outer pipe, one end of said inner pipe is connected with said inner pipe type connector, the other end is connected with said outer pipe type connector, the peripheral surface of said inner pipe type connector is provided with a plurality of communication holes communicated with the inner and outer spaces of the inner pipe type connector; during freezing, refrigerating fluid flows into a space defined by the inner pipe and the outer pipe through the refrigerating fluid inflow port, then flows into the inner pipe through the communicating hole, and then flows out from the outer pipe type connector and the refrigerating fluid outflow port.
6. A subway tunnel connection channel construction method as claimed in claim 5, wherein said communication holes are distributed along the circumference of said inner pipe type connector, an annular liquid distribution chamber extending along the circumference of said outer pipe type connector is provided in said outer end wall, said refrigerating liquid inlet is communicated with said annular liquid distribution chamber, said annular liquid distribution chamber is provided with a plurality of flow dispersion holes distributed along the circumference of said annular liquid distribution chamber and penetrating the inner end surface of said outer end wall; when in freezing, the refrigerating fluid enters the annular liquid distribution cavity through the refrigerating fluid inlet and then flows into a space enclosed by the inner pipe and the outer pipe from the flow dispersing holes.
7. The subway tunnel connection channel construction method as claimed in claim 5, wherein both the inner end wall and the outer end wall are detachably connected with the pipe body, and the inner pipe is of a flexible structure; the outer pipe type connector is provided with an outer pipe type connector head flanging penetrating through the inner pipe, an outer end annular cavity extending along the circumferential direction of the inner pipe is arranged in the wall part of the outer end of the inner pipe, an outer end part strapping rope for fixing the inner pipe on the outer pipe type connector penetrates through the outer end part annular cavity, an outer end part operating hole penetrating through the outer surface of the inner pipe is formed in the outer end part annular cavity, and two ends of the outer end part strapping rope are tied together to form a rope knot located at the outer end part operating hole; the inner pipe type connector is provided with an inner pipe type connector end flanging penetrating through the inner pipe, an inner end annular cavity extending along the circumferential direction of the inner pipe is arranged in the wall portion of the inner end of the inner pipe, an inner end binding rope fixing the inner pipe on the inner pipe type connector penetrates through the inner end annular cavity, an inner end part operation hole penetrating through the outer surface of the inner pipe is formed in the inner end annular cavity, and two ends of the inner end binding rope are tied together to form a rope knot located at the inner end part operation hole.
8. A method as claimed in claim 5, wherein the pipe body is formed by splicing a plurality of pipe sections, adjacent pipe sections are connected together in a sealing manner by means of annular sealing rings extending along the circumferential direction of the pipe sections, the annular sealing rings are hollow, and the annular sealing rings are filled with water.
9. The subway tunnel connection channel construction method as claimed in claim 5, wherein said inner tube is of a flexible structure, said inner end wall is inserted into said tube, said tube is provided with a plurality of tube body connection holes circumferentially distributed along said tube, said inner end wall is provided with a plurality of end wall connection holes circumferentially distributed along said inner end wall on its circumferential surface, said tube body connection holes are provided with connection pins and springs for driving said connection pins to be inserted into said end wall connection holes, said connection pins are slidably and sealingly connected with said end wall connection holes, said inner end wall is provided with a liquid flow channel for communicating the inner space of said inner tube with said end wall connection holes, said end wall connection holes are located outside said tube when said inner tube is in a straightened state, and said inner end wall is still inserted into said tube; the method for pulling out the cooling liquid circulating heat exchange pipeline and injecting cement slurry into the freezing hole comprises the following steps of 1, unfreezing the cooling liquid circulating heat exchange pipeline and the freezing layer and separating the cooling liquid circulating heat exchange pipeline from the freezing layer until the cooling liquid circulating heat exchange pipeline can move in the freezing hole; 2. pressurizing the space enclosed by the inner pipe and the outer pipe or the liquid in the inner pipe to make the connecting pin be separated from the end wall part; 3. injecting liquid into a space defined by the inner tube and the outer tube, and pressurizing and extruding the liquid until the inner tube is straightened, wherein the end wall connecting hole is positioned outside the tube body as a result of straightening the inner tube; 4. and cement slurry is injected into the inner pipe, the cement slurry flows out of the freezing hole through the liquid flow channel and the end wall connecting hole, and the cement slurry is filled into the freezing hole and drives the cooling liquid circulating heat exchange pipeline to move towards the outside of the freezing hole as a result of the cement slurry flowing out of the freezing hole.
10. A method as claimed in claim 9, wherein when the pipe body is formed of a plurality of sections and the heat exchange pipe for cooling liquid circulation is integrally pulled out due to spatial interference of the subway tunnel, the step 4 comprises the steps of: 4.1, injecting cement slurry into the inner pipe until the pipe section at the outermost end extends out of the freezing hole, and then taking the pipe section at the outermost end; 4.2, connecting the outer end wall to the outer end of the pipe section at the secondary outer end, injecting cement slurry into the inner pipe until the pipe section at the secondary outer end extends out of the freezing hole, taking off the pipe section at the secondary outer end, enabling the inner end wall to move and penetrate through the pipe body by pulling the inner pipe before the cement slurry is solidified, enabling the end wall connecting hole to be positioned outside the pipe body, and taking off the pipe section at the secondary outer end; the remaining pipe section is removed in the same way as in step 4.2.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108843328A (en) * | 2018-06-25 | 2018-11-20 | 佳琳 | A kind of Metro Connection Passage excavation construction support construction method |
| CN110159275A (en) * | 2019-06-26 | 2019-08-23 | 中交路桥建设有限公司 | Water-rich sand layer geology Metro Thoroughfare freezing hole arragement construction and construction method |
| WO2020244677A1 (en) * | 2019-09-28 | 2020-12-10 | 中铁九局集团有限公司 | Freezing construction method for connecting passage, and freezing system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108843328A (en) * | 2018-06-25 | 2018-11-20 | 佳琳 | A kind of Metro Connection Passage excavation construction support construction method |
| CN110159275A (en) * | 2019-06-26 | 2019-08-23 | 中交路桥建设有限公司 | Water-rich sand layer geology Metro Thoroughfare freezing hole arragement construction and construction method |
| WO2020244677A1 (en) * | 2019-09-28 | 2020-12-10 | 中铁九局集团有限公司 | Freezing construction method for connecting passage, and freezing system |
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