CN114922635B - Parallel freezing system for shield underground butt joint and abandoned shell disassembly and construction method - Google Patents
Parallel freezing system for shield underground butt joint and abandoned shell disassembly and construction method Download PDFInfo
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- CN114922635B CN114922635B CN202210587067.4A CN202210587067A CN114922635B CN 114922635 B CN114922635 B CN 114922635B CN 202210587067 A CN202210587067 A CN 202210587067A CN 114922635 B CN114922635 B CN 114922635B
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- 238000007710 freezing Methods 0.000 title claims abstract description 188
- 230000008014 freezing Effects 0.000 title claims abstract description 186
- 210000001503 joint Anatomy 0.000 title claims abstract description 30
- 238000010276 construction Methods 0.000 title claims abstract description 28
- 239000002689 soil Substances 0.000 claims abstract description 51
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 7
- 230000005641 tunneling Effects 0.000 claims description 25
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 238000005057 refrigeration Methods 0.000 claims description 11
- 238000003466 welding Methods 0.000 claims description 10
- 238000005192 partition Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 4
- 238000005728 strengthening Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 17
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000010304 firing Methods 0.000 abstract description 2
- 230000008018 melting Effects 0.000 abstract description 2
- 238000002844 melting Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000009412 basement excavation Methods 0.000 description 4
- 230000002787 reinforcement Effects 0.000 description 3
- 238000002679 ablation Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000003032 molecular docking Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
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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
-
- 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
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/08—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining with additional boring or cutting means other than the conventional cutting edge of the shield
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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)
Abstract
The invention discloses a parallel freezing system for shield underground butt joint and abandoned shell disassembly and a construction method. The system can shorten the working time of opening a warehouse for tool changing, avoid the problem that a certain freezing pipeline fails to work during freezing construction and can not continue to freeze and reinforce the stratum, ensure the freezing and reinforcing effects of a soil body in the construction processes of butt joint and shell abandoning and disintegration in the shield ground, avoid the influence of firing operation on the melting of the frozen body, be suitable for circular cutter heads with various sizes, be suitable for U-shaped cutter heads, rectangular cutter heads, similar rectangular cutter heads and other special-shaped cutter heads, and have the advantages of strong feasibility, environmental protection and the like.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to a parallel freezing system for shield underground butt joint and abandoned shell disassembly and a construction method.
Background
In the underground tunneling process, the shield tunneling machines are often faced with special construction conditions that the working period is shortened, a receiving vertical shaft cannot be set and the like, and in the case, two shield tunneling machines are generally adopted to simultaneously tunnel from two ends in opposite directions to a certain point to carry out underground butt joint and shell abandoning and disintegration. According to the current engineering examples at home and abroad, the ground butt joint mode mainly comprises a civil butt joint mode and a mechanical butt joint mode. The mechanical butt joint needs to specially design the shield machine, the shield equipment has higher manufacturing cost, and the requirement on the butt joint precision is strict; the key of civil butt joint is to realize the strengthening of the butt joint stratum by a grouting auxiliary method or a freezing auxiliary method, so that the applicability is wider, and the method is mostly adopted in domestic shield butt joint engineering. Particularly, the freezing auxiliary method can be suitable for various complex hydrogeological conditions, such as water-rich soft soil stratum, water-containing loose rock-soil layer, high-pressure stratum and the like, and has the advantages of good controllability, environmental friendliness, wide application and the like.
Specifically, the conventional freezing auxiliary method has two implementation forms, one is to install a freezing pipe, and the other is a freezing cutter head. The construction method for driving the freezing pipe comprises the following research, firstly, chinese patent (application number: 201110321819.4) discloses a method for freezing a bent pipe at one side of a shield butt-joint stratum and a freezing pipe driving device thereof, wherein a bent freezing pipe is driven out from a butt-joint single-side shield, the end part of the bent freezing pipe is close to a shield shell at the opposite side, so that a soil body frozen body is formed, too many holes are formed in the bent freezing pipe, the freezing pipe is bent, the construction difficulty is high, and the quality cannot be guaranteed. Secondly, chinese patent (application number: 201620639984.2) discloses a shield butt joint semi-circular freezing reinforcement structure, wherein a plurality of semi-circular freezing pipes are uniformly arranged along the circumference of a shield shell in a unilateral butt joint shield machine, but the technical difficulty of bending the freezing pipes into the semi-circular freezing pipes by drilling holes from one side and applying external force is higher, and the feasibility of construction cannot be ensured. The utility model discloses an above-mentioned patent is the shield and constructs the butt joint in-process and beat to establish the cryovial to the stratum, freezes and consolidates the stratum, wherein beats to establish the cryovial and need bore in advance on the shield shell and get the drilling, has destroyed the integrality of shield structure machine, still need squeeze into in addition and freeze the bending of pipe and predetermine the angle, and the degree of difficulty of construction is great, and the compressive strength of the freezing body that forms is difficult for guaranteeing.
Aiming at the defects of a method for arranging a freezing pipe, the invention provides a freezing cutter head construction method in the field of domestic shield tunneling, and the method can weld a freezing pipeline in advance, determine the range of a required freezing reinforcement body, ensure the integrity of a shield tunneling machine and reduce the construction difficulty. Firstly, chinese patent (application number: 202021591287.7) discloses a cutter head and tunneling equipment comprising the cutter head, wherein a heating plate is arranged on the cutter head, and a temperature control channel is matched, so that the cutter head has the freezing and heating functions. Secondly, chinese patent (application number: 201910273074.5) discloses a shield machine with an end face freezing system and a protection method thereof, wherein a pipeline inlet and a pipeline outlet are integrated together, so that a pipeline can be quickly connected. Thirdly, chinese patent (application number: 201811428677. X) discloses a freezing cutterhead arrangement structure, which arranges freezing pipes in blocks and reduces the welding difficulty of freezing pipelines. Also, a chinese patent (application No. 201910423963.5) discloses a normal pressure tool changing cutter head with a freezing function, which has a tool changing spoke arm and a heat insulation pipeline for realizing tool changing at normal pressure. Finally, a Chinese patent (application number: 201810689313.0) discloses a shield tunneling machine cutter head freezing pipeline connecting structure, wherein a sealing bin is arranged in a slurry water bin to prevent slurry from flowing into a freezing pipeline, but when a shield abandoning shell is disassembled, no corresponding freezing pipeline is arranged to ensure the water sealing property of soil bodies in the butt joint range and the strength of stratum soil bodies.
The conventional shield freezing cutter head patent does not provide a specific measure for avoiding the ablation influence of the firing operation on the frozen body, does not have specific freezing pipeline arrangement, has poor feasibility and cannot ensure the strength of a frozen stratum. Most importantly, in the construction process of shield underground docking and shell abandoning disassembly, after the cutter head is disassembled, the conventional freezing cutter head stops working, the water sealing property and the stratum strength of the soil body in the docking range cannot be guaranteed at the moment, and the risk of shield shell abandoning disassembly is high.
Disclosure of Invention
The invention aims to provide a parallel freezing system for shield underground butt joint and abandoned shell disassembly and a construction method thereof, the method ensures the freezing and reinforcing effects of soil bodies in the shield underground butt joint and abandoned shell disassembly construction process, can avoid the influence of fire operation on the melting of frozen bodies, is suitable for circular cutter heads of various sizes, is also suitable for U-shaped, rectangular and quasi-rectangular cutter heads, and has the advantages of strong feasibility, environmental protection and the like.
In order to realize the purpose, the invention adopts the following technical scheme:
a construction method of a parallel freezing system for shield underground butt joint and abandoned shell disassembly is characterized in that: the parallel freezing system comprises four freezing pipelines which are arranged in parallel, namely a core freezing pipeline, a circular ring freezing pipeline, a front shield freezing pipeline and an inter-shield freezing pipeline;
the core freezing pipelines are arranged on the cutterhead spoke beams at the back side of the cutterhead and are radially arranged;
the circular ring freezing pipeline is arranged on a large circular ring beam on the back side of the cutter head, and the size of a circular ring is matched with that of the large circular ring beam of the cutter head;
the front shield freezing pipeline is arranged on the inner side of a shield shell between the soil bin partition plate and the cutter head and is spirally distributed along the inner wall of the shield shell;
the inter-shield freezing pipeline is arranged in a butt joint area between two shield machine cutterheads which dig in opposite directions, is in a spiral shape, and has the same diameter as the cutterheads;
the core freezing pipelines are arranged in one layer or two layers, and the two layers of core freezing pipelines are arranged at intervals;
the core freezing pipeline, the circular ring freezing pipeline, the anterior shield freezing pipeline and the inter-shield freezing pipeline are all made of seamless steel pipes;
the pitch of the front shield freezing pipeline and the shield-shield freezing pipeline is 300-500 mm;
the construction method comprises the following steps:
step one, arranging a freezing pipeline: arranging the core freezing pipeline, the circular ring freezing pipeline and the anterior shield freezing pipeline in parallel;
step two, performing opposite tunneling operation: the two shield machines simultaneously carry out tunneling operation in opposite directions;
step three, opening the bin and replacing the cutter: stopping the tunneling operation of the shield tunneling machine, then performing soil body replacement in a soil bin of the shield tunneling machine and freezing and reinforcing of soil body at a cutter head, and then replacing the cutter;
step four, reinforcing the stratum: soil body replacement operation is carried out in the soil bins of the two shield tunneling machines, then the circular ring freezing pipeline and the front shield freezing pipeline are opened, and the core freezing pipeline is kept in a closed state;
fifthly, excavating a butt-jointed stratum: keeping the circular freezing pipeline and the front shield freezing pipeline in an open state all the time, and excavating a butt-jointed stratum between the two shield machines;
step six, installing a freezing pipeline between shields: arranging inter-shield freezing pipelines between two shield machine cutterheads tunneling in opposite directions;
step seven, disassembling a unilateral shield apparatus: keeping the circular freezing pipeline, the front shield freezing pipeline and the shield freezing pipeline in an open state, and sequentially dismantling a propelling oil tank, a pipeline, a cable, a dragging trolley, a bridge frame, a spiral conveyor, an assembling machine, a middle shield structure, a cutter head main body, a main drive and a front shield residual structure of the unilateral shield machine;
step eight, arranging a refrigerating pipeline between the shields on one side: lengthening and extending the freezing pipeline between shields in the sixth step in a cutter head dismantling area;
step nine, dismantling the opposite side shield apparatus and performing freezing pipeline operation between the opposite side shields: repeating the operation of the seventh step and the eighth step;
step ten, butting two shield shells: keeping the refrigeration states of the front shield freezing pipeline and the shield inter-freezing pipeline, welding and sealing the shield shells formed by the two shield machines after being decomposed by using a steel plate, and not disassembling the shield inter-freezing pipeline;
and step eleven, grouting detection is carried out, and grouting filling and detecting scanning are carried out on the rear part of the steel plate wall and the outside of the shield shell.
Compared with the prior art, the invention adopts the parallel arrangement of the core freezing pipeline, the circular ring freezing pipeline, the anterior shield freezing pipeline and the shield freezing pipeline, thereby avoiding that a certain pipeline fails to work during freezing construction and can not continue to freeze and reinforce the stratum; when the bin is opened for tool changing, soil body replacement and soil body freezing at the cutter head are adopted to assist the bin opening for tool changing, so that the frozen soil amount needing to be chiseled after the bin opening is reduced, and the tool changing and applying time is shortened; when the butt-jointed stratum is frozen and reinforced, the opened circular ring freezing pipeline and the front shield freezing pipeline can ensure the freezing effect of the butt-jointed soil body and the safety of butt-joint construction, and the core freezing pipeline is in a closed state, so that the volume of the frozen soil body between two shield machines can be reduced, the excavation amount of frozen soil can be reduced, the construction period can be shortened, and the manual operation intensity can be reduced; when the excavation operation of the butt-jointed stratum is carried out, the circular ring freezing pipeline and the anterior shield freezing pipeline are always in an open state so as to reinforce the stratum and ensure the safety; during and after the two shield machines are disassembled, the freezing and reinforcing of the butt-jointed stratum are still kept, so that the construction safety of shell abandoning and disassembling is guaranteed, and the influence of fire operation on frozen soil ablation is prevented. The method is suitable for freezing reinforcement construction of shield underground butt joint and abandoned shell disassembly, and is strong in universality and environment-friendly.
Drawings
FIG. 1 is a schematic view of a portion of the structure of the present invention.
FIG. 2 is another schematic view of the present invention.
Fig. 3 is a schematic view of the overall structure of the present invention.
In the figure: 1. a cutter head; 2. a core refrigeration circuit; 3. a circular ring freezing pipeline; 4. an anterior shield freezing line; 5. a soil bin partition; 6. a cutter head spoke beam; 7. the cutter head is a large circular beam; 8. an air inlet; 9. a pressure relief vent; 10. a shield room freezing pipeline; 11. a shield shell.
Detailed Description
The invention is further explained by combining the attached drawings, and in order to realize the purpose, the invention adopts the following technical scheme:
as shown in fig. 1, fig. 2 and fig. 3, the parallel freezing system for shield underground butt joint and shell abandoning disassembly and the construction method thereof comprise the following steps:
arranging a freezing pipeline, installing a core freezing pipeline 2 and a circular ring freezing pipeline 3 on the back side of a cutter head 1, and arranging a front shield freezing pipeline 4 in a spiral shape on the inner side of a shield shell 11 between a soil bin partition plate 5 and the cutter head 1; the core freezing pipeline 2, the ring freezing pipeline 3 and the anterior shield freezing pipeline 4 are arranged in parallel; the core freezing pipelines 2 are fixed on the cutter disc spoke beams and are radially arranged; the circular ring freezing pipeline 3 is fixed on the large circular ring beam of the cutter head 1, and the size of the circular ring is matched with that of the large circular ring beam 7 of the cutter head.
Step two, performing opposite tunneling operation, and performing simultaneous opposite tunneling operation on the two shield machines according to the designed construction route;
and step three, opening a cabin to replace the cutter, periodically replacing the cutter in the tunneling process of the shield machine, stopping the tunneling operation of the shield machine, replacing the soil body in the soil cabin of the shield machine and freezing and reinforcing the soil body at the cutter head 1, replacing the cutter with a hobbing cutter or a tearing cutter according to the soil layer property when the freezing strength of the soil body at the cutter head 1 reaches a designed value, and continuing the tunneling operation after the cutter is replaced.
The soil body replacement specifically comprises the following steps: and (3) connecting an air inlet 8 of the soil bin into a pneumatic press, introducing air to replace the mud-water mixture in the soil bin, opening a pressure relief hole 9 to relieve pressure when the air pressure in the soil bin reaches the designed pressure value of the soil bin, and repeatedly pressurizing and relieving pressure to complete the replacement of the soil body in the soil bin into the air when the normal pressure value is recovered.
And (3) freezing the soil body at the cutter head 1, starting the core freezing pipeline 2, the circular ring freezing pipeline 3 and the front shield freezing pipeline 4 to freeze and reinforce the soil body at the cutter head 1, and stopping freezing operation when the freezing strength of the soil body at the cutter head 1 reaches a design value.
And step four, the stratum is reinforced in a butt joint mode, the shield machines dig into the butt joint position and stop digging operation, the two shield machines perform soil body replacement operation on the soil bin, after the soil body replacement operation is completed, the circular freezing pipeline 3 and the front shield freezing pipeline 4 are opened, the core freezing pipeline 2 is kept in a closed state, and the butt joint stratum between the two shield machines is frozen and reinforced.
Fifthly, excavating a butted stratum, and manually or mechanically excavating the butted stratum between the two shield machines when the frozen strength of the butted stratum between the two shield machines reaches a design value; when the excavation operation of the butt-jointed stratum is carried out, the circular freezing pipeline 3 and the anterior shield freezing pipeline 4 are always in an open state.
And step six, additionally arranging an inter-shield freezing pipeline 10, and after the excavation of the butt-jointed stratum is finished, arranging the inter-shield freezing pipeline 10 between two oppositely-tunneled shield machine cutterheads 1.
The inter-shield freezing pipeline 10 is spiral and has the same diameter as that of a cutter head 1 of the shield machine, and the inter-shield freezing pipeline 10 is connected with the core freezing pipeline 2, the circular ring freezing pipeline 3 and the anterior shield freezing pipeline 4 in parallel.
And step seven, disassembling a unilateral shield machine, keeping the circular freezing pipeline 3, the anterior shield freezing pipeline 4 and the inter-shield freezing pipeline 10 in an open state, and sequentially disassembling a propelling oil tank, a pipeline, a cable, a dragging trolley, a bridge frame, a spiral conveyor, an assembling machine, a middle shield structure, a cutter head 1 main body, a main drive and an anterior shield residual structure of the unilateral shield machine.
And step eight, arranging the freezing pipelines 10 between the shields at the single side, and after the dismantling operation is finished, lengthening and extending the freezing pipelines 10 between the shields in the step six in the dismantling area of the cutter head 1 to finish the arrangement operation of the freezing pipelines 10 between the shields at the single side.
And step nine, dismantling the opposite side shield apparatus and operating the freezing pipeline 10 between the opposite side shields, repeating the operations of the step seven and the step eight, dismantling the opposite side shield apparatus and finishing the arrangement operation of the freezing pipeline 10 between the opposite side shields.
And step ten, butting the two shield shells, keeping the refrigeration state of the front shield refrigeration pipeline 4 and the shield refrigeration pipeline 10 after the arrangement operation of the shield refrigeration pipelines 10 of the two shield machines is completed, welding and sealing the shield shells 11 of the two shield machines after the two shield machines are disassembled by using a steel plate, and leaving the shield refrigeration pipeline 10 in a butt joint area without disassembling after the welding is completed.
And step eleven, grouting detection is carried out, after welding operation of the shield shells 11 of the two shield machines is finished, grouting is carried out on the rear portion of the steel plate wall and the outside of the shield shells, then detection scanning is carried out, and compactness of a welding area is guaranteed.
In the first step, one or two layers of core freezing pipelines 2 are arranged, and the two layers of core freezing pipelines 2 are arranged at intervals. The core freezing pipeline 2, the ring freezing pipeline 3, the anterior shield freezing pipeline 4 and the inter-shield freezing pipeline 10 are all made of seamless steel tubes, in one embodiment, the core freezing pipeline 2, the ring freezing pipeline 3 and the anterior shield freezing pipeline 4 are formed by welding seamless steel tubes with the diameter of 60mm, and the inter-shield freezing pipeline 10 is formed by welding seamless steel tubes with the diameter of 100 mm.
The air inlet 8 in the third step is arranged at the upper part of the soil bin partition plate 5 close to the shield shell 11 and communicated with the inner cavity of the soil bin; the pressure relief hole 9 is arranged at the lower part of the soil bin partition plate 5 close to the shield shell 11 and communicated with the inner cavity of the soil bin. In the fifth step, a cutterhead spoke beam 6 below the cutterhead 1 is firstly removed, and a constructor excavates the grounding layer through the position of the removed cutterhead spoke beam 6. In the first step and the sixth step, the pitch of the anterior shield freezing pipeline 4 and the inter-shield freezing pipeline 10 is 300-500 mm, and in a specific embodiment, the pitch of the anterior shield freezing pipeline 4 is 500mm. And step ten, before welding the steel plate and the shield shell 11, opening the front shield freezing pipeline 4 to enable the front shield freezing pipeline 4 to be in a freezing state, and arranging an anti-corrosion waterproof layer on the surface of the steel plate. The refrigerating fluid in the core refrigerating pipeline 2, the circular ring refrigerating pipeline 3, the anterior shield refrigerating pipeline 4 and the inter-shield refrigerating pipeline 10 is calcium chloride solution.
The above embodiments are only a few illustrations of the inventive concept and implementation, not limitations thereof, and the technical solutions without substantial changes are still within the scope of protection under the inventive concept.
Claims (1)
1. A construction method of a parallel freezing system for shield underground butt joint and abandoned shell disassembly is characterized in that: the parallel freezing system comprises four freezing pipelines which are arranged in parallel, namely a core freezing pipeline (2), a circular ring freezing pipeline (3), a front shield freezing pipeline (4) and an inter shield freezing pipeline (10);
the core freezing pipelines (2) are arranged on the cutterhead spoke beams (6) on the back side of the cutterhead (1) and are radially arranged;
the circular ring freezing pipeline (3) is arranged on a large circular ring beam (7) on the back side of the cutter head (1), and the size of a circular ring is matched with that of the large circular ring beam (7) of the cutter head;
the front shield freezing pipeline (4) is arranged on the inner side of a shield shell (11) between the soil bin partition plate (5) and the cutter head (1) and is spirally distributed along the inner wall of the shield shell (11);
the inter-shield freezing pipeline (10) is arranged in a butt joint area between two shield machine cutterheads which are driven in opposite directions, and the inter-shield freezing pipeline (10) is spiral and has the same diameter as that of the cutterhead (1);
the core freezing pipelines (2) are arranged in one layer or two layers, and the two layers of core freezing pipelines (2) are arranged at intervals;
the core freezing pipeline (2), the circular ring freezing pipeline (3), the front shield freezing pipeline (4) and the inter-shield freezing pipeline (10) are all made of seamless steel pipes;
the screw pitch of the anterior shield freezing pipeline (4) and the shield-space freezing pipeline (10) is 300-500 mm;
the construction method comprises the following steps:
step one, arranging a freezing pipeline: the core freezing pipeline (2), the circular ring freezing pipeline (3) and the anterior shield freezing pipeline (4) are arranged in parallel;
step two, tunneling operation in opposite directions: the two shield machines simultaneously carry out tunneling operation in opposite directions;
step three, opening the bin and replacing the cutter: stopping the tunneling operation of the shield tunneling machine, then performing soil body replacement in a soil bin of the shield tunneling machine and freezing and reinforcing of the soil body at the cutter head (1), and then replacing the cutter;
step four, strengthening the stratum: soil body replacement operation is carried out in the soil bins of the two shield tunneling machines, then the circular ring freezing pipeline (3) and the front shield freezing pipeline (4) are opened, and the core freezing pipeline (2) is kept in a closed state;
fifthly, excavating a butt-jointed stratum: keeping the circular ring freezing pipeline (3) and the front shield freezing pipeline (4) in an open state all the time, and excavating the butt-jointed stratum between the two shield machines;
step six, installing a freezing pipeline between shields: an inter-shield freezing pipeline (10) is arranged between two shield machine cutterheads which are driven in opposite directions;
step seven, disassembling a unilateral shield apparatus: keeping the circular freezing pipeline (3), the front shield freezing pipeline (4) and the inter-shield freezing pipeline (10) in an open state, and sequentially dismantling a propelling oil tank, a pipeline, a cable, a dragging trolley, a bridge frame, a spiral conveyor, an assembling machine, a middle shield structure, a cutter head main body, a main drive and a front shield residual structure of the unilateral shield machine;
step eight, arranging a refrigerating pipeline between the shields on one side: lengthening and extending the shield refrigerating pipeline (10) in the sixth step in a cutter head (1) dismantling area;
step nine, dismantling the opposite side shield apparatus and operating the freezing pipeline (10) between the opposite side shields: repeating the operation of the seventh step and the eighth step;
step ten, butting two shield shells: keeping the refrigeration state of the front shield refrigeration pipeline (4) and the shield room refrigeration pipeline (10), welding and sealing the shield shells (11) of the two shield machines after being decomposed by using a steel plate, and not disassembling the shield room refrigeration pipeline (10);
and step eleven, grouting detection is carried out, and grouting filling and detecting scanning are carried out on the rear portion of the steel plate wall and the outer portion of the shield shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210587067.4A CN114922635B (en) | 2022-05-27 | 2022-05-27 | Parallel freezing system for shield underground butt joint and abandoned shell disassembly and construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210587067.4A CN114922635B (en) | 2022-05-27 | 2022-05-27 | Parallel freezing system for shield underground butt joint and abandoned shell disassembly and construction method |
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| Publication Number | Publication Date |
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| CN114922635A CN114922635A (en) | 2022-08-19 |
| CN114922635B true CN114922635B (en) | 2023-04-18 |
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Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205677624U (en) * | 2016-06-27 | 2016-11-09 | 海南大学 | Shield docks semi-circular shape consolidation by freezing structure |
| CN206346745U (en) * | 2016-12-30 | 2017-07-21 | 中铁工程装备集团有限公司 | A kind of shield cutter and shield machine with freezing function |
| CN208564553U (en) * | 2018-06-28 | 2019-03-01 | 广东华隧建设集团股份有限公司 | A kind of cutter head of shield machine freezing pipeline jointing construction |
| CN109403992B (en) * | 2018-11-27 | 2024-03-22 | 中铁工程装备集团有限公司 | Freezing blade disc arrangement structure |
| CN109538226B (en) * | 2019-01-14 | 2024-03-08 | 中铁工程装备集团有限公司 | Novel cutter head freezing static pipeline arrangement structure |
| CN110080786A (en) * | 2019-04-04 | 2019-08-02 | 中船重型装备有限公司 | A kind of shield machine and its guard method with end face freezing system |
| CN113756823A (en) * | 2020-06-01 | 2021-12-07 | 宏润建设集团股份有限公司 | Indirect annular freezing device in shield tunneling machine, mounting method thereof and freezing system |
| CN113494295B (en) * | 2021-08-10 | 2023-07-21 | 中铁隧道局集团有限公司 | Butt joint construction method in ground of long shield tunnel |
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