CN113833488B - Subway tunnel connecting channel construction method - Google Patents
Subway tunnel connecting channel construction method Download PDFInfo
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- CN113833488B CN113833488B CN202110869902.9A CN202110869902A CN113833488B CN 113833488 B CN113833488 B CN 113833488B CN 202110869902 A CN202110869902 A CN 202110869902A CN 113833488 B CN113833488 B CN 113833488B
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- 238000010276 construction Methods 0.000 title claims abstract description 29
- 238000007710 freezing Methods 0.000 claims abstract description 60
- 230000008014 freezing Effects 0.000 claims abstract description 60
- 238000004891 communication Methods 0.000 claims abstract description 36
- 239000002689 soil Substances 0.000 claims abstract description 35
- 239000010410 layer Substances 0.000 claims abstract description 15
- 238000001816 cooling Methods 0.000 claims abstract description 14
- 238000010257 thawing Methods 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 11
- 230000002093 peripheral effect Effects 0.000 claims abstract description 8
- 239000002344 surface layer Substances 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 59
- 239000012530 fluid Substances 0.000 claims description 34
- 239000004568 cement Substances 0.000 claims description 26
- 238000009826 distribution Methods 0.000 claims description 18
- 238000007789 sealing Methods 0.000 claims description 16
- 230000000149 penetrating effect Effects 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 230000003014 reinforcing effect Effects 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 239000012267 brine Substances 0.000 claims description 3
- 238000009792 diffusion process Methods 0.000 claims description 3
- 238000005553 drilling Methods 0.000 claims description 3
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 3
- 239000000110 cooling liquid Substances 0.000 description 11
- 239000002002 slurry Substances 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000005457 ice water Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007569 slipcasting Methods 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
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
- E21D9/14—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
- 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
Landscapes
- 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 application discloses a subway tunnel connection channel construction method which is characterized by comprising the following steps of: A. forming an anti-collapse leakage cylinder surrounding the periphery of the soil body area of the building communication channel, wherein the anti-collapse leakage cylinder is a freezing layer formed by cooling and freezing the soil body of the surrounding channel 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-preventing leakage cylinder to form a connecting channel for connecting two subway tunnels, and forming a supporting surface layer on the peripheral surface of the connecting channel; C. thawing: stopping cooling the frozen layer, and naturally thawing the frozen layer. The application provides a subway tunnel connecting channel construction method capable of effectively preventing collapse leakage in the connecting channel construction process, and solves the problem that collapse leakage is easy to occur in the construction process of the existing subway connecting channel building on wet and soft soil bodies.
Description
Technical Field
The application relates to the technical field of underground subway construction, in particular to a subway tunnel connecting channel construction method.
Background
In the construction process of a subway, a communication channel for communicating two subway tunnels (up-down tunnels) needs to be constructed between the two subway tunnels. When the address of the area where the connecting channel is located is wet and soft soil body such as mucky soil body, collapse and water seepage phenomenon can be generated when the connecting channel is excavated, so that the connecting channel is difficult to construct.
Disclosure of Invention
The application provides a subway tunnel connecting channel construction method capable of effectively preventing collapse leakage in the connecting channel construction process, and solves the problem that collapse leakage is easy to occur in the construction process of the existing subway connecting channel building on wet and soft soil bodies.
In order to achieve the above object, the present application adopts the following technical scheme: the subway tunnel connection channel construction method is characterized by comprising the following steps of: A. forming an anti-collapse leakage cylinder surrounding the periphery of the soil body area of the building communication channel, wherein the anti-collapse leakage cylinder is a freezing layer formed by cooling and freezing the soil body of the surrounding channel 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-preventing leakage cylinder to form a connecting channel for connecting two subway tunnels, and forming a supporting surface layer on the peripheral surface of the connecting channel; C. thawing: stopping cooling the frozen layer, and naturally thawing the frozen layer. According to the technical scheme, the periphery of the soil body area of the building communication channel is frozen to form the rigid and sealed collapse-preventing leakage cylinder, so that the collapse-preventing effect is achieved, the building communication channel is formed by freezing and hardening, and the water seepage phenomenon cannot occur.
Preferably, in the step a, the cooling method includes: 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 a refrigerating fluid circulating heat exchange pipeline is inserted into the freezing holes, so that the refrigerating fluid below zero flows through the refrigerating fluid circulating heat exchange pipeline, and the cooling and freezing of the soil around the soil area of the building communication channel are realized; and B, taking out the cooling liquid circulation heat exchange pipeline, and injecting cement slurry into the freezing holes to solidify to form the reinforcing ribs for reinforcing the communication channels. The concrete technical scheme for freezing is provided, and the strength of the plug connecting channel after construction is finished can be improved, so that collapse is preferably prevented.
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 also built in the subway tunnel before the freezing hole. The wall thickness in the middle of the collapse-preventing leakage cylinder is thicker when a plurality of rows of freezing holes distributed along the thickness direction of the collapse-preventing leakage cylinder wall cannot be drilled in a subway tunnel with limited construction, and the wall thickness of the collapse-preventing leakage cylinder can be improved by means of the rigid tunnel retaining wall for construction so as to prevent the collapse-preventing leakage cylinder from being collapsed due to dust prevention of supporting lugs.
Preferably, the refrigerating fluid is brine. The temperature of the refrigerating fluid when being input into the refrigerating fluid hole can be guaranteed to be lower than zero under the premise of low cost, so that water in the soil body is guaranteed to be frozen and hardened.
Preferably, the refrigerating fluid circulation 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 surrounded 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 the peripheral surface of the inner pipe type connector is provided with a plurality of communication holes communicated with the inner space and the outer space of the inner pipe type connector; during freezing, the frozen liquid flows into the space surrounded by the inner tube and the outer tube through the frozen liquid flow inlet, flows into the inner tube through the communication hole, and flows out of the outer tube type connector and the frozen liquid flow outlet. The technical scheme of the refrigerating fluid circulating heat exchange pipeline is provided, and the water separation walking back and forth in the same pipeline can be ensured.
Preferably, the communication holes are distributed along the circumferential direction of the inner tubular connector, an annular liquid distribution cavity extending along the circumferential direction of the outer tubular connector is arranged in the outer end wall, the refrigerating liquid flow inlet is communicated with the annular liquid distribution cavity, and the annular liquid distribution cavity is provided with a plurality of diffusing holes distributed along the circumferential direction of the annular liquid distribution cavity and penetrating through the inner end surface of the outer end wall; during freezing, the frozen liquid enters the annular liquid distribution cavity through the frozen liquid inlet and then flows into the space surrounded by the inner tube and the outer tube from the diffusion hole. Can improve the uniformity during liquid feeding and prevent the influence of a static flow area on the freezing efficiency.
Preferably, the opening direction of the inner port of the refrigerating fluid inlet is the radial direction of the annular liquid distribution cavity. The uniformity in 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 connecting 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 bundling rope for fixing the inner pipe on the outer pipe type connector is penetrated in the outer end annular cavity, the outer end annular cavity is provided with an outer end working hole penetrating through the outer surface of the inner pipe, and a knot formed by tying two ends of the outer end bundling rope is positioned at the outer end working hole; the inner pipe type connector is provided with an inner pipe type connecting head flanging which penetrates through the inner pipe, an inner end annular cavity 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 bundling rope which is used for fixing the inner pipe on the inner pipe type connector is penetrated through the inner end annular cavity, an inner end operation hole which penetrates through the outer surface of the inner pipe is formed in the inner end annular cavity, and a knot formed by tying two ends of the inner end bundling rope together is positioned at the inner end operation hole. The fixing of the inner tube and the outer tube is convenient, 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 manner through annular sealing rings extending along the circumferential direction of the pipe sections, the annular sealing rings are of hollow structures, and the annular sealing rings are filled with water. The characteristic of the water freezing volume change can be utilized to enable the annular sealing ring to be further stretched from the inside in the freezing process, so that the sealing reliability is improved. The multi-section structure enables the construction to be carried out when the subway tunnel connecting channel construction method is limited by the diameter of the subway tunnel for a long time.
Preferably, the two ends of the pipe section are provided with internal thread sections, adjacent pipe sections are connected together through the threaded connection of the internal thread sections on the external thread connecting ring, 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 flatness of the through outer peripheral surface can be ensured, so that labor is saved and smoothness is realized when the refrigerating fluid circulating heat exchange pipeline is pulled out.
Preferably, the inner pipe is of a flexible structure, the inner end wall penetrates through the pipe body, a plurality of pipe body connecting holes distributed along the circumferential direction of the pipe body are formed in the pipe body, a plurality of end wall connecting holes distributed along the circumferential direction of the inner end wall are formed in the circumferential surface of the inner end wall, connecting pins and springs for driving the connecting pins to be inserted into the end wall connecting holes are arranged in the pipe body connecting holes, the connecting pins are connected with the end wall connecting holes in a sliding and sealing mode, a liquid flow channel for communicating the inner space of the inner pipe with the end wall connecting holes is formed in the inner end wall, and when the inner pipe is in a straightened state, the end wall connecting holes are located outside the pipe body and still penetrate through the pipe body; 1, thawing between the cooling liquid circulation heat exchange pipeline and a frozen layer, and releasing the cooling liquid circulation heat exchange pipeline until the cooling liquid circulation heat exchange pipeline can move in the frozen hole; 2. pressurizing the liquid injection in the space enclosed by the inner tube and the outer tube or in the inner tube to enable the connecting pin to be separated from the end wall part connection; 3. injecting liquid into the space surrounded by the inner pipe and the outer pipe to perform pressurization until the inner pipe is straightened, wherein the end wall connecting hole is positioned outside the pipe body as a result of straightening the inner pipe; 4. and injecting cement paste into the inner pipe, and flowing the cement paste into the freezing hole through the liquid flow channel and the end wall connecting hole, wherein the cement paste is filled into the freezing hole and drives the cooling liquid circulating heat exchange pipeline to move towards the outer part of the freezing hole as a result of flowing the cement paste into the freezing hole. Can drive the refrigerating fluid circulation heat exchange pipeline to pull out in the reaction of slip casting for laborsaving convenience when pulling out. The cement slurry is injected through the inner pipe, and the cement slurry in the refrigerating fluid circulating heat exchange pipeline is discharged after the completion of the injection.
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 paste into the inner pipe until the pipe section at the outermost end extends out of the freezing hole, and 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 paste 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 to enable the inner end wall to move and penetrate through the pipe body before the cement paste is solidified, enabling the end wall connecting hole to be located outside the pipe body, and taking off the pipe section at the secondary outer end; and (5) taking out the rest pipe section by adopting the same method as the step 4.2.
Preferably, the inner tube is an insulating structure. The efficiency of cooling when forming the anti-collapse leakage tube can be improved.
The application has the following beneficial effects: collapse and leakage can not be generated when the subway connecting channel is formed 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 cross-sectional view of a freeze arrangement during construction of the present application;
FIG. 2 is a schematic cross-sectional view A-A of FIG. 1;
FIG. 3 is a schematic diagram of a chilled liquid loop heat exchange tube in the present application;
FIG. 4 is an enlarged schematic view of the inner end of the chilled liquid loop heat exchange tube, i.e., the right end of FIG. 3;
FIG. 5 is an enlarged partial schematic view at B of FIG. 4;
FIG. 6 is an enlarged schematic view of the outer end of the refrigerant fluid circulation heat exchange tube, i.e., the left end of FIG. 3;
FIG. 7 is an enlarged partial schematic view at C of FIG. 6;
FIG. 8 is a partially enlarged schematic view at D of FIG. 3;
fig. 9 is a partially enlarged schematic view at E of fig. 8.
In the figure: the communication channel 1, the collapse-preventing leakage tube 2, the freezing hole 3, the inner tube 5, the tube body 6, the inner end wall 7, the outer end wall 8, the inner tube type connector 9, the outer tube type connector 10, the chilled liquid outlet 11, the chilled liquid inlet 12, the communication hole 13, the annular liquid distribution cavity 14, the diffusing hole 15, the outer tube type connecting head flanging 16, the outer end annular cavity 17, the outer end bundling rope 18, the outer end working hole 19, a knot 20 formed by tying two ends of the outer end bundling rope together, the inner tube type connecting head flanging 21, the inner end annular cavity 22, the inner end bundling rope 23, the inner end working hole 24, a knot 25 formed by tying two ends of the inner end bundling rope together, the tube segment 26, the annular sealing ring seal 27, the water 28, the inner thread segment 29, the tube body connecting hole 30, the end wall connecting hole 31, the connecting pin 32, the spring 33, the liquid flow channel 34, the outermost tube segment 35, the secondary outer end tube segment 36, the subway tunnel 37 and the outer thread connecting ring 4.
Detailed Description
The application is further illustrated in the following, in conjunction with the accompanying drawings and specific embodiments.
Referring to fig. 1 to 9, a subway tunnel connection channel construction method includes the following steps: A. forming an anti-collapse leakage cylinder 2 surrounding the periphery of the soil area of the building communication channel 1, wherein the anti-collapse leakage cylinder is a freezing layer formed by cooling and freezing the soil of the surrounding channels of the soil area of the building communication channel; B. forming a communication channel: digging out a soil body in the inner area of the collapse-preventing leakage cylinder to form a connecting channel which is communicated with two subway tunnels 37, and forming a supporting surface layer on the peripheral surface of the connecting channel; C. thawing: stopping cooling the frozen layer, and naturally thawing the frozen layer.
In the step A, the temperature reduction method comprises the following steps: drilling a plurality of freezing holes 3 distributed along the circumferential direction of the connecting channel from the soil around the soil area of the building connecting channel in the subway tunnel, inserting a refrigerating fluid circulating heat exchange pipeline into the freezing holes, and enabling the refrigerating fluid below zero to flow through the refrigerating fluid circulating heat exchange pipeline so as to cool and freeze the soil around the soil area of the building connecting channel; and B, taking out the cooling liquid circulation heat exchange pipeline, and injecting cement slurry into the freezing holes to solidify to form the reinforcing ribs for reinforcing the communication channels. The freezing hole is an inclined hole with the inner end inclined towards the direction far away from the connecting channel, and a rigid tunnel retaining wall is also built in the subway tunnel before the freezing hole. The frozen liquid is brine.
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 end wall is provided with an inner pipe type connector 9, an outer end wall is provided with an outer pipe type connector 10, the outer surface of the outer end wall is provided with 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 surrounded 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 the peripheral surface of the inner pipe type connector is provided with a plurality of communication holes 13 communicated with the inner space and the outer space of the inner pipe type connector; during freezing, the frozen liquid flows into the space surrounded by the inner tube and the outer tube through the frozen liquid flow inlet, flows into the inner tube through the communication hole, and flows out of the outer tube type connector and the frozen liquid flow outlet. And (5) cooling the refrigerating fluid circularly by an ice water machine. The communication holes are distributed along the circumferential direction of the inner tubular connector, an annular liquid distribution cavity 14 extending along the circumferential direction of the outer tubular connector is arranged in the outer end wall, the refrigerating liquid inlet is communicated with the annular liquid distribution cavity, and the annular liquid distribution cavity is provided with a plurality of diffusing holes 15 distributed along the circumferential direction of the annular liquid distribution cavity and penetrating through the inner end surface of the outer end wall; during freezing, the frozen liquid enters the annular liquid distribution cavity through the frozen liquid inlet and then flows into the space surrounded by the inner tube and the outer tube from the diffusion hole. The opening direction of the inner port of the freezing liquid flow inlet is the radial direction of the annular liquid distribution cavity. The inner end wall and the outer end wall are both detachably connected together with the tube body, and the outer end wall is in particular screwed into the tube body. The inner tube is of a flexible structure; the outer pipe connector is provided with an outer pipe connecting 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 bundling rope 18 for fixing the inner pipe on the outer pipe connector is penetrated in the outer end annular cavity, the outer end annular cavity is provided with an outer end working hole 19 penetrating through the outer surface of the inner pipe, and a knot 20 formed by tying two ends of the outer end bundling rope is positioned at the outer end working hole; the inner pipe connector is provided with an inner pipe connecting head flanging 21 penetrating 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 bundling rope 23 for fixing the inner pipe on the inner pipe connector is penetrated in the inner end annular cavity, the inner end annular cavity is provided with an inner end working hole 24 penetrating the outer surface of the inner pipe, and two ends of the inner end bundling rope are tied together to form a rope knot 25 which is positioned at the inner end working hole. The body is formed by the concatenation of a plurality of pipeline sections 26, and adjacent pipeline sections are in the same place through the annular seal circle seal 27 that extends along pipeline section circumference, and annular seal circle is hollow structure, be full of water 28 in the annular seal circle. The two ends of the pipe section are provided with internal thread sections 29, the adjacent pipe sections are connected together by the internal thread sections being connected with the external thread connecting ring 4 in a threaded manner, and the annular sealing ring is positioned between the end faces of the two adjacent pipe sections and is clamped by the two adjacent pipe sections. The inner end wall is arranged in the pipe body in a penetrating way, a plurality of pipe body connecting holes 30 distributed along the circumferential direction of the pipe body are formed in the pipe 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, connecting pins 32 and springs 33 for driving the connecting pins to be inserted into the end wall connecting holes are arranged in the pipe body connecting holes, the connecting pins are connected with the end wall connecting holes in a sliding and sealing way, a liquid flow channel 34 for communicating the inner space of the inner pipe with the end wall connecting holes is arranged in the inner end wall, the end wall connecting holes are positioned outside the pipe body when the inner pipe is in a straightened state, and the inner end wall is still arranged in the pipe body in a penetrating way; 1, thawing and disengaging the cooling liquid circulation heat exchange pipeline and a frozen layer (specifically thawing by heating hot water in the frozen liquid circulation heat exchange pipeline) until the cooling liquid circulation heat exchange pipeline can move in the frozen hole; 2. pressurizing the liquid injection in the space enclosed by the inner tube and the outer tube or in the inner tube to enable the connecting pin to be separated from the end wall part connection; 3. injecting liquid into the space surrounded by the inner pipe and the outer pipe to perform pressurization until the inner pipe is straightened, wherein the end wall connecting hole is positioned outside the pipe body as a result of straightening the inner pipe; 4. and injecting cement paste into the inner pipe, and flowing the cement paste into the freezing hole through the liquid flow channel and the end wall connecting hole, wherein the cement paste is filled into the freezing hole and drives the cooling liquid circulating heat exchange pipeline to move towards the outer part of the freezing hole as a result of flowing the cement paste into the freezing hole. In the application, when the pipe body is formed by a plurality 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 paste into the inner pipe until the pipe section at the outermost end extends out of the freezing hole, and then removing the pipe section 35 at the outermost end; 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 to enable the inner end wall to move and penetrate through the pipe body before the cement slurry is solidified, enabling the end wall connecting hole to be located outside the pipe body, and taking off the pipe section at the secondary outer end; and (5) taking out the rest pipe section by adopting the same method as the step 4.2. The inner tube is of a heat insulation structure.
Claims (8)
1. The subway tunnel connection channel construction method is characterized by comprising the following steps of: A. forming an anti-collapse leakage cylinder surrounding the periphery of the soil body area of the building communication channel, wherein the anti-collapse leakage cylinder is a freezing layer formed by cooling and freezing the soil body of the surrounding channel 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-preventing leakage cylinder to form a connecting channel for connecting two subway tunnels, and forming a supporting surface layer on the peripheral surface of the connecting channel; C. thawing: stopping cooling the frozen layer, and naturally thawing the frozen layer; in the step A, the cooling method comprises the following steps: 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 a refrigerating fluid circulating heat exchange pipeline is inserted into the freezing holes, so that the refrigerating fluid below zero flows through the refrigerating fluid circulating heat exchange pipeline, and the cooling and freezing of the soil around the soil area of the building communication channel are realized; after the step B, taking out the refrigerating fluid circulation heat exchange pipeline, injecting cement into the freezing holes to solidify to form reinforcing ribs for reinforcing a communication channel, wherein the refrigerating fluid circulation 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 conducting 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 a space surrounded 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 the peripheral surface of the inner pipe type connector is provided with a plurality of communication holes communicated with the inner space and the outer space of the inner pipe type connector; during freezing, the frozen liquid flows into the space surrounded by the inner tube and the outer tube through the frozen liquid flow inlet, flows into the inner tube through the communication hole, and flows out of the outer tube type connector and the frozen liquid flow outlet.
2. The method according to claim 1, wherein the freezing hole is an inclined hole with an inner end inclined away from the connecting passage, and a rigid tunnel retaining wall is also built in the subway tunnel before the freezing hole.
3. The subway tunnel connection channel construction method according to claim 1 or 2, wherein the freezing liquid is brine.
4. The subway tunnel connecting channel construction method according to claim 1, wherein 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 inlet is communicated with the annular liquid distribution cavity, and the annular liquid distribution cavity is provided with a plurality of diffusing holes distributed along the circumferential direction of the annular liquid distribution cavity and penetrating through the inner end surface of the outer end wall; during freezing, the frozen liquid enters the annular liquid distribution cavity through the frozen liquid inlet and then flows into the space surrounded by the inner tube and the outer tube from the diffusion hole.
5. The subway tunnel connecting channel construction method according to claim 1, wherein 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 connecting 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 bundling rope for fixing the inner pipe on the outer pipe type connector is penetrated in the outer end annular cavity, the outer end annular cavity is provided with an outer end working hole penetrating through the outer surface of the inner pipe, and a knot formed by tying two ends of the outer end bundling rope is positioned at the outer end working hole; the inner pipe type connector is provided with an inner pipe type connecting head flanging which penetrates through the inner pipe, an inner end annular cavity 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 bundling rope which is used for fixing the inner pipe on the inner pipe type connector is penetrated through the inner end annular cavity, an inner end operation hole which penetrates through the outer surface of the inner pipe is formed in the inner end annular cavity, and a knot formed by tying two ends of the inner end bundling rope together is positioned at the inner end operation hole.
6. The subway tunnel connecting channel construction method according to claim 1, wherein 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, the annular sealing rings are of hollow structures, and water is filled in the annular sealing rings.
7. The subway tunnel connecting channel construction method according to claim 1, wherein the inner pipe is of a flexible structure, the inner end wall penetrates through the pipe body, a plurality of pipe body connecting holes distributed along the circumferential direction of the pipe body are formed in the pipe body, a plurality of end wall connecting holes distributed along the circumferential direction of the inner end wall are formed in the circumferential surface of the inner end wall, connecting pins and springs for driving the connecting pins to be inserted into the end wall connecting holes are arranged in the pipe body connecting holes, the connecting pins are connected with the end wall connecting holes in a sliding sealing manner, a liquid flow channel for communicating the inner space of the inner pipe with the end wall connecting holes is formed in the inner end wall, and when the inner pipe is in a straightened state, the end wall connecting holes are positioned outside the pipe body and still penetrate through the pipe body; 1, thawing between the refrigerating fluid circulation heat exchange pipeline and a frozen layer, and releasing the refrigerating fluid circulation heat exchange pipeline until the refrigerating fluid circulation heat exchange pipeline can move in the frozen hole; 2. pressurizing the liquid injection in the space enclosed by the inner tube and the outer tube or in the inner tube to enable the connecting pin to be separated from the end wall part connection; 3. injecting liquid into the space surrounded by the inner pipe and the outer pipe to perform pressurization until the inner pipe is straightened, wherein the end wall connecting hole is positioned outside the pipe body as a result of straightening the inner pipe; 4. and injecting cement paste into the inner tube, and flowing the cement paste into the freezing hole through the liquid flow channel and the end wall connecting hole, wherein the cement paste is filled into the freezing hole and drives the refrigerating fluid circulating heat exchange pipeline to move towards the outer part of the freezing hole as a result of flowing the cement paste into the freezing hole.
8. The construction method of a subway tunnel connecting channel according to claim 7, wherein when the pipe body is formed by a plurality of sections of pipe sections and the space interference refrigerating fluid circulation heat exchange pipeline of the subway tunnel is pulled out integrally, the step 4 comprises the following steps: 4.1, injecting cement paste into the inner pipe until the pipe section at the outermost end extends out of the freezing hole, and 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 paste 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 to enable the inner end wall to move and penetrate through the pipe body before the cement paste is solidified, enabling the end wall connecting hole to be located outside the pipe body, and taking off the pipe section at the secondary outer end; and (5) taking out the rest pipe section by adopting the same method as the step 4.2.
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|---|---|---|---|---|
| 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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