CN114198108A - Method for breaking and removing obstacles of shield-driven downward-passing existing station enclosure structure in water-rich sand layer - Google Patents
Method for breaking and removing obstacles of shield-driven downward-passing existing station enclosure structure in water-rich sand layer Download PDFInfo
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- CN114198108A CN114198108A CN202111570193.0A CN202111570193A CN114198108A CN 114198108 A CN114198108 A CN 114198108A CN 202111570193 A CN202111570193 A CN 202111570193A CN 114198108 A CN114198108 A CN 114198108A
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000004576 sand Substances 0.000 title claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 230000004888 barrier function Effects 0.000 claims abstract description 82
- 238000007710 freezing Methods 0.000 claims abstract description 33
- 230000008014 freezing Effects 0.000 claims abstract description 32
- 238000012423 maintenance Methods 0.000 claims abstract description 24
- 230000002787 reinforcement Effects 0.000 claims abstract description 19
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 9
- 239000002689 soil Substances 0.000 claims abstract description 9
- 238000001556 precipitation Methods 0.000 claims abstract description 4
- 238000007789 sealing Methods 0.000 claims abstract description 4
- 238000010276 construction Methods 0.000 claims description 27
- 230000000149 penetrating effect Effects 0.000 claims description 9
- 230000035515 penetration Effects 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000004567 concrete Substances 0.000 claims description 3
- 239000011152 fibreglass Substances 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
- 238000009412 basement excavation Methods 0.000 description 3
- 238000005422 blasting Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 2
- 230000005641 tunneling Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000012546 transfer Methods 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
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D5/00—Lining shafts; Linings therefor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D5/00—Lining shafts; Linings therefor
- E21D5/11—Lining shafts; Linings therefor with combinations of different materials, e.g. wood, metal, concrete
-
- 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)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Geochemistry & Mineralogy (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Mechanical Engineering (AREA)
- Wood Science & Technology (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Soil Sciences (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention discloses a method for removing obstacles by using an existing station enclosure structure under a shield in a water-rich sand layer, which comprises the following steps: firstly, constructing a barrier removal well enclosure structure; constructing a waterproof curtain and a base full reinforcement body of the barrier removing well enclosure structure; thirdly, constructing a dewatering well; fourthly, excavating the foundation pit of the obstacle removing well and erecting an obstacle removing well supporting structure; fifthly, removing part of supporting pieces in the support structure of the obstacle clearing well and constructing an inner lining structure of the obstacle clearing well; sixthly, stopping water precipitation and sealing the well by the dewatering well in the obstacle clearing well enclosure structure pit; constructing a freezing pipe and forming a freezing reinforcement body; eighthly, manually removing obstacles; and ninthly, backfilling sandy soil to remove obstacles. The invention aims at the problems that the existing line maintenance structure is a reinforced concrete structure, a shield machine cannot directly pass through the existing line maintenance structure, two barrier removing wells constructed on two sides of the existing station are used for removing the existing line enclosure structure, the influence on the existing line is safe and controllable, and the deformation of the existing structure cannot be caused.
Description
Technical Field
The invention belongs to the technical field of shield tunneling existing station enclosure breaking and obstacle clearing, and particularly relates to a shield tunneling existing station enclosure breaking and obstacle clearing method in a water-rich sand layer.
Background
Along with the gradual deepening of national subway construction, project crossing phenomena are increased day by day, the situation that a shield penetrates through an existing station and an existing section often occurs, particularly the situation that the shield penetrates through the existing station is relatively complex to process, if the working condition that the shield penetrates in the later period is not considered during construction of the existing station, a cutter head of a shield machine cutter cannot cut a reinforced concrete enclosure structure, even if part of reinforced concrete can be cut, the cutter head can be blocked in a soil bin of the shield machine and cannot be discharged, and the shield machine cannot be continuously tunneled. According to the past engineering practice experience, the following methods can be adopted for processing: firstly, a ground pilot hole blasting method; second, full-circle casing drilling. Both of the above methods have serious drawbacks and disadvantages. The ground pilot hole blasting method has limited capacity of removing underground reinforced concrete, can not solve the problem fundamentally, and the blasting generates strong vibration, brings unavoidable and uncontrollable influence to closing the existing station, and can cause the phenomena of structural deformation and cracking. The full-circle casing drilling method can also damage the existing station structure while removing the drilled pile or the underground diaphragm wall.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for removing obstacles of an existing station enclosure structure by a shield penetrating downwards in a water-rich sand layer aiming at the defects in the prior art, wherein the existing line maintenance structure is a reinforced concrete structure, the shield machine cannot directly penetrate through the existing line maintenance structure, two obstacle removing wells constructed on two sides of the existing station are used for removing the existing line enclosure structure, the influence on the existing line is safe and controllable, the deformation of the existing structure cannot be caused, and the method is convenient to popularize and use.
In order to solve the technical problems, the invention adopts the technical scheme that: a method for removing obstacles by a shield under an existing station enclosure structure in a water-rich sand layer is characterized by comprising the following steps:
step one, constructing a barrier removing well enclosure structure: constructing barrier removing well building enclosures outside existing line maintenance structures on two sides of an existing station, wherein the construction range of the barrier removing well building enclosures is not smaller than the construction range of the newly-built shield tunnel;
the existing line maintenance structure is of a reinforced concrete structure;
step two, constructing a waterproof curtain and a base full-space reinforcement body of the barrier removing well enclosure structure: constructing a waterproof curtain outside the barrier removing well enclosure structure and constructing a base full reinforcement body on a base inside the barrier removing well enclosure structure;
step three, constructing a dewatering well: constructing a plurality of dewatering wells inside and outside the barrier removing well enclosure structure, and lowering the water level in the pit of the barrier removing well enclosure structure to 1m below the base of the pit;
step four, excavating the foundation pit of the obstacle removing well and erecting an obstacle removing well supporting structure: excavating a foundation pit in the barrier removal well enclosure structure, and meanwhile, sequentially arranging supporting pieces from bottom to top, wherein the supporting pieces form a barrier removal well supporting structure;
step five, removing part of supporting pieces in the barrier removing well supporting structure and constructing a barrier removing well lining structure: removing part of supporting pieces in the support structure of the barrier removing well, which are positioned in the construction range of the downward penetration of the newly-built shield tunnel, and constructing a lining structure in the barrier removing well, wherein the lining structure of the barrier removing well adopts glass fiber ribs in the construction range of the downward penetration of the newly-built shield tunnel;
stopping water precipitation and sealing the well in the obstacle clearing well enclosure structure pit;
step seven, constructing a freezing pipe and forming a freezing reinforcement body: a dewatering well outside the obstacle removing well enclosure structure pit stops dewatering, a freezing pipe is constructed from one side of the obstacle removing well lining structure close to the existing station, and the stratum is frozen and reinforced to form a freezing reinforcement body;
step eight, manually removing obstacles: removing barrier removing well building enclosures, waterproof curtains and existing line building enclosures in a construction range of the newly-built shield tunnel penetrating downwards, and removing freezing pipes in a removal range after removal is completed;
step nine, backfilling sandy soil and removing obstacles: and backfilling the barrier removing well by using sandy soil, and synchronously removing the rest supporting pieces in the supporting structure of the barrier removing well to prepare construction for the newly-built shield tunnel to pass through the existing station.
The method for removing the obstacles by breaking the enclosure structure of the existing station under the shield in the water-rich sand layer is characterized by comprising the following steps of: the barrier removing well enclosure structure is a ground connecting wall or a drilled pile, and the barrier removing well enclosure structure is a glass fiber reinforced plastic enclosure structure in the construction range of the newly-built shield tunnel penetrating downwards.
The method for removing the obstacles by breaking the enclosure structure of the existing station under the shield in the water-rich sand layer is characterized by comprising the following steps of: the support piece in the barrier-removing well supporting structure comprises a concrete support and a steel support.
The method for removing the obstacles by breaking the enclosure structure of the existing station under the shield in the water-rich sand layer is characterized by comprising the following steps of: and D, in the sand backfilling and barrier removing process in the step nine, the sand is backfilled quickly, and the risk of water inrush and sand inrush after the freezing pipe is pulled out is reduced.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the barrier removing well enclosure structure is constructed outside the existing line maintenance structures on two sides of the existing station, the waterproof curtain is constructed outside the barrier removing well enclosure structure, and the base is constructed inside the barrier removing well enclosure structure and is reinforced and connected with the existing line maintenance structure, so that the stratum structure where the existing line maintenance structure is located is stabilized, the strength of later-stage removal of the existing line maintenance structure is ensured, and the barrier removing well enclosure structure is convenient to popularize and use.
2. According to the invention, the foundation pit excavation is carried out in the barrier removal well enclosure structure, and meanwhile, the supporting pieces are sequentially arranged from bottom to top, and the plurality of supporting pieces form the barrier removal well supporting structure, so that the force transmission effect when the existing line maintenance structure is removed is enhanced, and the barrier removal well enclosure structure is reliable and stable and has a good using effect.
3. The method has simple steps, the dewatering well outside the obstacle removing well enclosure structure pit stops dewatering, the freezing pipe is constructed from one side of the obstacle removing well lining structure close to the existing station, the freezing and strengthening of the stratum are started to form the freezing strengthening body, the obstacle removing well enclosure structure, the water-stop curtain and the existing line enclosure structure in the construction range of the newly-built shield tunnel penetrating downwards are broken, the freezing pipe in the breaking range is pulled out after the breaking is finished, the freezing strengthening body is utilized to support the existing line to maintain the structure bottom structure, the influence on the existing line is safe and controllable, the deformation of the existing structure cannot be caused, the obstacle removing well is backfilled with sand, the stratum is filled, and the method is convenient to popularize and use.
In conclusion, the invention aims at the problems that the existing line maintenance structure is a reinforced concrete structure, the shield machine cannot directly pass through the existing line maintenance structure, two obstacle clearing wells constructed on two sides of the existing station are used for clearing the existing line enclosure structure, the influence on the existing line is safe and controllable, the existing structure cannot be deformed, and the popularization and the use are convenient.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
Fig. 1 is a schematic structural view of the construction barrier removal well enclosure structure of the invention.
Fig. 2 is a schematic structural view of a waterproof curtain and a base full hall reinforcement body of the construction barrier removal well enclosure structure.
FIG. 3 is a schematic structural view of the dewatering well constructed according to the present invention.
Fig. 4 is a schematic structural diagram of the foundation pit excavation and obstacle clearing well erection supporting structure of the obstacle clearing well.
Fig. 5 is a schematic structural view of the present invention for removing a portion of the support members in the barrier shaft supporting structure and constructing a lining structure of the barrier shaft.
Fig. 6 is a schematic structural view of the present invention for constructing a freezing pipe and forming a freezing reinforcement body.
Fig. 7 is a schematic structural view of the manual obstacle removing device of the present invention.
FIG. 8 is a schematic structural diagram of the sand backfilling barrier-removing well according to the invention.
Fig. 9 is a structural state diagram of the newly-built shield tunnel passing through the existing station.
FIG. 10 is a block flow diagram of a method of the present invention.
Description of reference numerals:
1-existing station; 2-existing line maintenance structure; 3, removing the obstacle well enclosure structure;
4, clearing the barrier well supporting structure; 5, a waterproof curtain; 6-reinforcing the base full space;
7, removing the lining structure of the barrier well; 8, freezing a pipe; 9-freezing the reinforcing body;
11-sandy soil; 12, newly building a shield tunnel; and 13, dewatering the well.
Detailed Description
As shown in fig. 1 to 10, the method for removing obstacles by using the existing station enclosure structure under the shield in the water-rich sand layer comprises the following steps:
step one, constructing a barrier removing well enclosure structure: constructing barrier removing well building enclosures 3 outside existing line maintenance structures 2 on two sides of an existing station 1, wherein the construction range of the barrier removing well building enclosures 3 is not less than the construction range of the newly-built shield tunnel 12 passing downwards;
the existing line maintenance structure 2 is of a reinforced concrete structure;
step two, constructing a waterproof curtain and a base full-space reinforcement body of the barrier removing well enclosure structure: constructing a waterproof curtain 5 at the outer side of the barrier removing well enclosure structure 3 and constructing a base full reinforcement body 6 at the inner side base of the barrier removing well enclosure structure 3;
step three, constructing a dewatering well: constructing a plurality of dewatering wells 13 on the inner side and the outer side of the obstacle removing well enclosure structure 3, and lowering the water level in the pit of the obstacle removing well enclosure structure 3 to 1m below the base of the pit;
step four, excavating the foundation pit of the obstacle removing well and erecting an obstacle removing well supporting structure: excavating a foundation pit in the barrier removal well enclosure structure 3, and meanwhile, sequentially arranging supporting pieces from bottom to top, wherein the supporting pieces form a barrier removal well supporting structure 4;
step five, removing part of supporting pieces in the barrier removing well supporting structure and constructing a barrier removing well lining structure: removing part of supporting pieces in the barrier removing well supporting structure 4, which are positioned in the construction range of the downward penetration of the newly-built shield tunnel 12, and constructing a barrier removing well lining structure 7, wherein the barrier removing well lining structure 7 adopts glass fiber ribs in the construction range corresponding to the downward penetration of the newly-built shield tunnel 12;
stopping water precipitation and sealing the well in the obstacle clearing well enclosure structure pit;
step seven, constructing a freezing pipe and forming a freezing reinforcement body: a dewatering well outside the obstacle removing well enclosure structure pit stops dewatering, a freezing pipe 8 is constructed from one side of the obstacle removing well lining structure 7 close to the existing station 1, and the stratum is frozen and reinforced to form a freezing reinforcement body 9;
step eight, manually removing obstacles: the barrier removing well enclosure structure 3, the waterproof curtain 5 and the existing line enclosure structure 2 in the construction range of the newly-built shield tunnel 12 penetrating downwards are broken, and the freezing pipe 8 in the breaking range is pulled out after the breaking is finished;
step nine, backfilling sandy soil and removing obstacles: and backfilling the barrier removing well by adopting sandy soil 11, and synchronously removing the rest supporting pieces in the support structure 4 of the barrier removing well to prepare for the construction of a newly-built shield tunnel 12 for downwards penetrating the existing station 1.
In this embodiment, the barrier removing well enclosure 3 is a ground wall or a bored pile, and the barrier removing well enclosure 3 is made of a glass fiber reinforced plastic enclosure in a construction range in which the newly built shield tunnel 12 is penetrated.
In this embodiment, the support members in the barrier shaft supporting structure 4 include concrete supports and steel supports.
In the embodiment, in the sand backfilling and barrier removing process in the ninth step, the sand is backfilled quickly, and the risk of water inrush and sand inrush after the freezing pipe 8 is pulled out is reduced.
When the invention is used, the barrier removing well enclosure structure 3 is constructed outside the existing line maintenance structures 2 on two sides of the existing station 1, the waterproof curtain 5 is constructed outside the barrier removing well enclosure structure 3, and the base full reinforcement body 6 is constructed on the base inside the barrier removing well enclosure structure 3 and is connected with the existing line maintenance structure 2, so that the stratum structure where the existing line maintenance structure 2 is located is stabilized, and the strength of later-period dismantling of the existing line maintenance structure 2 is ensured; excavation of a foundation pit is carried out in the barrier removal well enclosure structure 3, meanwhile, supporting pieces are sequentially arranged from bottom to top, and the barrier removal well supporting structure 4 is formed by the supporting pieces, so that the force transfer effect when the existing line maintenance structure 2 is removed is enhanced, and the reliability and stability are realized; the dewatering well outside the obstacle removing well enclosure structure pit stops dewatering, a freezing pipe 8 is constructed from one side, close to the existing station 1, of an obstacle removing well lining structure 7, the stratum begins to be frozen and reinforced to form a freezing reinforcement body 9, the obstacle removing well enclosure structure 3, the water stop curtain 5 and the existing line enclosure structure 2 in the construction range of the newly-built shield tunnel 12 penetrating downwards are broken, the freezing pipe 8 in the breaking range is pulled out after the breaking is completed, the freezing reinforcement body 9 is used for supporting the bottom structure of the existing line maintenance structure 2, the influence on the existing line is safe and controllable, deformation of the existing structure cannot be caused, sand backfills the obstacle removing well, and the stratum is filled.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (4)
1. A method for removing obstacles by a shield under an existing station enclosure structure in a water-rich sand layer is characterized by comprising the following steps:
step one, constructing a barrier removing well enclosure structure: constructing barrier removing well building enclosures (3) outside existing line maintenance structures (2) on two sides of an existing station (1), wherein the construction range of the barrier removing well building enclosures (3) is not less than the construction range of a newly-built shield tunnel (12) passing downwards;
the existing line maintenance structure (2) is of a reinforced concrete structure;
step two, constructing a waterproof curtain and a base full-space reinforcement body of the barrier removing well enclosure structure: constructing a waterproof curtain (5) at the outer side of the barrier removing well enclosure structure (3) and constructing a base full reinforcement body (6) at the inner side base of the barrier removing well enclosure structure (3);
step three, constructing a dewatering well: constructing a plurality of dewatering wells (13) on the inner side and the outer side of the obstacle removing well enclosure structure (3), and lowering the water level in the pit of the obstacle removing well enclosure structure (3) to 1m below the base of the obstacle removing well enclosure structure;
step four, excavating the foundation pit of the obstacle removing well and erecting an obstacle removing well supporting structure: excavating a foundation pit in the barrier removal well enclosure structure (3), and meanwhile, sequentially arranging supporting pieces from bottom to top, wherein the supporting pieces form a barrier removal well supporting structure (4);
step five, removing part of supporting pieces in the barrier removing well supporting structure and constructing a barrier removing well lining structure: removing part of supporting pieces in the supporting structure (4) of the barrier removing well, which are positioned in the construction range of the downward penetration of the newly-built shield tunnel (12), and constructing a lining structure (7) in the barrier removing well, wherein the lining structure (7) of the barrier removing well adopts glass fiber ribs in the construction range of the downward penetration of the newly-built shield tunnel (12);
stopping water precipitation and sealing the well in the obstacle clearing well enclosure structure pit;
step seven, constructing a freezing pipe and forming a freezing reinforcement body: a dewatering well outside the obstacle removing well enclosure structure pit stops dewatering, a freezing pipe (8) is constructed from one side of the obstacle removing well lining structure (7) close to the existing station (1), and the stratum is frozen and reinforced to form a freezing reinforcement body (9);
step eight, manually removing obstacles: the barrier removing well enclosure structure (3), the waterproof curtain (5) and the existing line enclosure structure (2) in the construction range of the newly-built shield tunnel (12) penetrating downwards are broken, and the freezing pipe (8) in the breaking range is pulled out after the breaking is finished;
step nine, backfilling sandy soil and removing obstacles: and backfilling the barrier removing well by adopting sandy soil (11), and synchronously removing the rest supporting pieces in the support structure (4) of the barrier removing well to prepare construction for the newly-built shield tunnel (12) to pass through the existing station (1) downwards.
2. The method for removing obstacles by a shield-driven downward-passing existing station enclosure structure in the water-rich sand layer according to claim 1, is characterized in that: the barrier removing well enclosure structure (3) is a ground connection wall or a drilled pile, and the barrier removing well enclosure structure (3) adopts a glass fiber reinforced plastic enclosure structure in the construction range of the newly-built shield tunnel (12) penetrating downwards.
3. The method for removing obstacles by a shield-driven downward-passing existing station enclosure structure in the water-rich sand layer according to claim 1, is characterized in that: the support piece in the barrier clearance well supporting structure (4) comprises a concrete support and a steel support.
4. The method for removing obstacles by a shield-driven downward-passing existing station enclosure structure in the water-rich sand layer according to claim 1, is characterized in that: and D, in the sand backfilling and barrier removing process in the step nine, the sand is backfilled quickly, and the water gushing and sand gushing risks after the freezing pipe (8) is pulled out are reduced.
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| CN202111570193.0A CN114198108A (en) | 2021-12-21 | 2021-12-21 | Method for breaking and removing obstacles of shield-driven downward-passing existing station enclosure structure in water-rich sand layer |
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