CN111236310B - Construction method of connecting channel of existing underground structure in weak water-rich stratum - Google Patents
Construction method of connecting channel of existing underground structure in weak water-rich stratum Download PDFInfo
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- CN111236310B CN111236310B CN202010138982.6A CN202010138982A CN111236310B CN 111236310 B CN111236310 B CN 111236310B CN 202010138982 A CN202010138982 A CN 202010138982A CN 111236310 B CN111236310 B CN 111236310B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
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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
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
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- Engineering & Computer Science (AREA)
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- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
- Soil Sciences (AREA)
- Agronomy & Crop Science (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The invention discloses a construction method of a connecting channel of an existing underground structure in a weak water-rich stratum, which comprises the following steps: 1) constructing a waterproof curtain; 2) reinforcing soft soil at the bottom; 3) reinforcing the soft soil at the upper part; 4) reinforcing soft soil in an excavation area; 5) secondary reinforcement of upper soft soil; 6) separating the outer wall from the enclosure structure; 7) removing the outer wall and the enclosure structure; 8) excavating a half-width soil body and performing primary support; 9) excavating the other half of soil body and carrying out primary support; 10) constructing a connecting channel structure; 11) dismantling the support; 12) repeating the steps 8) to 11) until the excavation and the structure construction of the whole connecting channel are completed; 13) and (4) removing the outer wall and the enclosure structure of the underground structure at the other end of the connecting channel, namely completing the construction of the connecting channel. The construction measures such as comprehensive pre-reinforcement, sectional and partitioned excavation, comprehensive support and the like adopted by the invention have the advantages of simple process, good water stopping effect, convenient construction, small risk and small influence on the surrounding environment, and are particularly suitable for soft water-rich strata.
Description
Technical Field
The invention relates to the technical field of underground engineering construction, in particular to a construction method of a connecting channel of an existing underground structure in a weak water-rich stratum.
Background
In order to better utilize urban underground space, underground passages which are connected with each other need to be arranged among underground structures, and particularly, the communication between a large underground commercial complex and an opening hole of an operation subway station becomes a normal state. At present, the construction of underground passages is usually carried out by adopting an open cut method or a pipe jacking method. The pipe jacking method is often difficult to obtain effective jacking force in the existing underground structure, open excavation construction has great influence on the environment, and traffic is seriously influenced. In the weak water-rich stratum in China, the phenomena of water gushing, mud outburst and the like are easily caused when underground space excavation and structure construction are carried out, so that the ground surface settlement is overlarge, and the safety of the peripheral structure is influenced. In the existing underground passage construction technology for connecting the existing underground structure, the construction method of the underground passage for ensuring the safety and the economy in the weak water-rich stratum is less involved.
Disclosure of Invention
The invention aims to provide a construction method of a connecting channel of an existing underground structure in a weak water-rich stratum. The method adopts construction measures such as comprehensive pre-reinforcement, sectional and partitioned excavation and comprehensive support modes, and can effectively prevent unfavorable geological phenomena such as water inrush and mud outburst in the excavation process of the weak and rich water stratum. Meanwhile, the influence on the ground environment can be reduced by adopting underground excavation construction, and the construction safety is ensured.
In order to achieve the purpose, the technical scheme of the invention is as follows: a construction method for a connecting channel of an existing underground structure in a weak water-rich stratum comprises the following steps:
1) constructing a waterproof curtain, namely constructing the waterproof curtain on two sides of the connecting channel by adopting a three-axis stirring pile or a high-pressure jet grouting pile;
2) reinforcing the soft soil at the bottom of the connecting channel by adopting a triaxial mixing pile or a high-pressure jet grouting pile;
3) reinforcing the soft soil at the upper part, namely reinforcing the soft soil above the connecting channel in advance by adopting a triaxial mixing pile, a high-pressure jet grouting pile or conduit grouting;
4) reinforcing soft soil in the excavation area, and grouting and reinforcing the soft soil in the excavation area by adopting a small guide pipe or a sleeve valve pipe;
5) secondary reinforcement of upper soft soil, namely performing secondary grouting reinforcement on the soil body reinforced above the connecting channel by adopting a small guide pipe or a sleeve valve pipe;
6) separating the outer wall from the enclosure structure, arranging a positioning hole by adopting a hole arranging machine, and separating the outer wall of the underground structure at one end of the connecting channel from the enclosure structure;
7) removing the outer wall and the enclosure structure, and sequentially removing the separated outer wall and the separated enclosure structure;
8) excavating a half-width soil body of a connecting channel in a segmented mode, spraying concrete to an excavated area, and arranging a straight-wall door type grating arch frame for primary support;
9) excavating the other half of soil body and carrying out primary support, excavating the soil body with the other half width of the connecting channel by adopting the method in the step 8), hanging a reinforcing mesh and spraying concrete on the excavated area, and arranging a straight-wall L-shaped grid arch center for carrying out primary support;
10) constructing a connecting channel structure, namely constructing a bottom plate of the connecting channel structure, and constructing side walls and a top plate of the connecting channel structure;
11) dismantling the support, namely dismantling the support part of the straight wall door type grating arch center exposed in the connecting channel;
12) repeating the steps 8) to 11) until the excavation and the structure construction of the whole connecting channel are completed;
13) and (4) removing the outer wall and the enclosure structure of the underground structure at the other end of the connecting channel, namely completing the construction of the connecting channel.
Further, in the step 2), the soft soil reinforcement thickness at the bottom of the connecting channel is determined according to the bearing capacity of the foundation and the bearing capacity of the soft lower lying layer by checking calculation, and is not less than 3 m.
Further, in the step 3), the reinforcing width of the soft soil above the connecting channel exceeds the width of the waterproof curtains on the two sides by 1m respectively.
Further, in the step 6), the structure is separated by using row-hole positioning through-length cutting at the boundary of the outer wall of the underground structure and the enclosure structure, the error is not more than 5mm, and the row-hole depth is lower than 5cm below the bottom of the dismantling area.
Further, the step 7) specifically includes the following steps:
a. paying off, positioning and removing the part;
b. paying off to determine the size of underground structure blocks;
c. arranging a cutting hole and a hoisting hole of the drilling rope saw by adopting a hole arranging machine;
d. cutting the structure into blocks by adopting a wire saw;
e. and (5) hoisting the materials out for outward transportation.
Further, the underground structure block plane size is not more than 1.5m multiplied by 1.5 m.
The invention has the beneficial effects that:
1. the soft soil around the underground passage adopts a partitioned and segmental reinforcing method, has good water stopping effect, avoids the phenomena of water inrush, mud burst and the like in the excavation process, and is particularly suitable for the excavation of the underground passage of a soft water-rich stratum.
2. The underground passage adopts a segmented and partitioned excavation method, so that the stability of rock and soil mass around the underground passage is improved, and the construction risk is obviously reduced.
3. The underground passage adopts a comprehensive supporting method of advanced reinforcement and preliminary supporting, which is beneficial to the integral stability of the structure and enables the construction of the underground passage structure to be more rapid and convenient.
4. The underground structure of the underground passage entrance and exit is dismantled in a mode of combining hole array separation and rope saw static force cutting, so that the influence of structure breaking construction on the existing structure and the surrounding environment is avoided to the greatest extent.
Drawings
FIG. 1 is a construction flow chart of a connecting channel of a subsurface structure of a weak water-rich stratum according to the invention;
FIG. 2 is a schematic view of a waterproof curtain in the construction process of a connecting passage according to the present invention;
FIG. 3 is a schematic view of the bottom soft soil reinforcement during the construction of the connecting channel according to the present invention;
FIG. 4 is a schematic view of upper soft soil reinforcement during the construction of the connecting channel according to the present invention;
FIG. 5 is a schematic diagram illustrating reinforcement of an excavated area during construction of a connecting channel according to the present invention;
FIG. 6 is a schematic diagram of secondary grouting reinforcement of an upper soil body in the construction process of a connecting channel according to the invention;
FIG. 7 is a hole arrangement distribution diagram for separating the outer wall of the underground structure from the building enclosure in the construction process of the connecting passage according to the present invention;
FIG. 8 is a schematic view of the demolition of the exterior wall and the envelope of the underground structure during the construction of the connecting passage according to the present invention;
FIG. 9 is a schematic diagram of half-width excavation and support in the construction process of the connecting passage according to the present invention;
FIG. 10 is a schematic view of another half of excavation and support in the construction process of the connecting passage according to the present invention;
FIG. 11 is a schematic view of the construction of the connecting passage according to the present invention;
FIG. 12 is a schematic view of the removal of the middle support during the construction of the connecting channel according to the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.
As shown in fig. 1, a method for constructing a connecting channel of an existing underground structure in a weak water-rich stratum comprises the following steps:
1) constructing a waterproof curtain, and constructing waterproof curtains 1 on two sides of the soil body of the connecting channel by using a triaxial mixing pile or a high-pressure jet grouting pile as shown in figure 2; the waterproof curtain 1 adopts 2 rows of three-axis stirring piles.
2) Reinforcing the soft soil at the bottom, namely reinforcing the soft soil 2 at the bottom of the soil body excavated by the connecting channel by using a triaxial mixing pile or a high-pressure jet grouting pile as shown in fig. 3; the reinforcement thickness of the soft soil 2 at the bottom is determined according to the bearing capacity of the foundation and the bearing capacity of the soft lower lying layer by checking calculation, and is not less than 3 m.
3) Reinforcing the soft soil at the upper part, and adopting a triaxial mixing pile, a high-pressure jet grouting pile or conduit grouting to reinforce the soft soil 3 above the soil body excavated by the connecting channel in advance as shown in figure 4; the reinforcing width of the upper soft soil 3 exceeds the width of the waterproof curtains on the two sides by 1-2m respectively.
4) And (5) reinforcing the soft soil in the excavation area, and grouting and reinforcing the soft soil in the excavation soil body by using small guide pipes or sleeve valve pipes as shown in figure 5 4.
5) And (3) secondarily reinforcing the upper soft soil, as shown in fig. 6, in order to enable the soil above the connecting channel to have higher strength and increase the stability of the top soil, carrying out secondary grouting reinforcement 5 on the reinforced upper soft soil 3 by adopting a small guide pipe or a sleeve valve pipe.
6) Separating the outer wall from the enclosure structure, as shown in fig. 7, arranging a positioning hole by using a hole arranging machine, and separating the outer wall 6 of the underground structure and the enclosure structure 7 at one end of the connecting channel 15; the method specifically comprises the following steps: and (3) separating the structure at the boundary of the outer wall 6 of the underground structure and the building envelope 7 by positioning and cutting through the row holes 8, wherein the error is not more than 5mm, and the row hole depth is lower than 5cm below the bottom of the demolition area.
7) The method comprises the following steps of removing an outer wall and a building enclosure, and removing the outer wall 6 and the building enclosure 7 after separation in sequence, as shown in fig. 8, specifically comprising the following steps:
a. paying off, positioning and removing the part;
b. paying off to determine the size of the underground structure block 9, wherein the plane size of the underground structure block 9 is not more than 1.5m multiplied by 1.5 m;
c. arranging a drilling rope saw cutting hole 10 and a hoisting hole 11 by adopting a hole arranging machine;
d. cutting the structural blocks 9 by a wire saw;
e. and (5) hoisting the materials out for outward transportation.
8) Excavating half of soil and performing primary support, excavating the soil with the half width of a connecting channel in a segmented mode as shown in fig. 9, spraying concrete to an excavation area, and arranging a straight-wall door type grating arch center 12 for performing primary support.
9) Excavating the other half of soil body and performing primary support, as shown in fig. 10, excavating the soil body of the other half width of the connecting channel by adopting the method of the step 8), hanging a reinforcing mesh and spraying concrete on the excavated area, and arranging a straight-wall L-shaped grid arch frame 16 for performing primary support.
10) As shown in fig. 11, the bottom plate of the connecting channel structure 13 is constructed first, and then the side walls and the top plate of the connecting channel structure are constructed.
11) The supports are removed, and the supporting parts 14 of the straight-wall door type grating arch exposed inside the connecting channel are removed, as shown in fig. 12.
12) And (5) repeating the steps 8) to 11) until the excavation and the structural construction of the whole connecting channel 15 are completed.
13) And (4) removing the outer wall and the building envelope of the underground structure at the other end of the connecting channel 15, namely completing the construction of the connecting channel 15.
The described embodiments are only some embodiments of the invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the scope of the present invention.
Claims (6)
1. A construction method for a connecting channel of an existing underground structure in a weak water-rich stratum is characterized by comprising the following steps:
1) constructing a waterproof curtain, namely constructing the waterproof curtain on two sides of the connecting channel by adopting a three-axis stirring pile or a high-pressure jet grouting pile;
2) reinforcing the soft soil at the bottom of the connecting channel by adopting a triaxial mixing pile or a high-pressure jet grouting pile;
3) reinforcing the soft soil at the upper part, namely reinforcing the soft soil above the connecting channel in advance by adopting a triaxial mixing pile, a high-pressure jet grouting pile or conduit grouting;
4) reinforcing soft soil in the excavation area, and grouting and reinforcing the soft soil in the excavation area by adopting a small guide pipe or a sleeve valve pipe;
5) secondary reinforcement of upper soft soil, namely performing secondary grouting reinforcement on the soil body reinforced above the connecting channel by adopting a small guide pipe or a sleeve valve pipe;
6) separating the outer wall from the enclosure structure, arranging a positioning hole by adopting a hole arranging machine, and separating the outer wall of the underground structure at one end of the connecting channel from the enclosure structure;
7) removing the outer wall and the enclosure structure, and sequentially removing the separated outer wall and the separated enclosure structure;
8) excavating a half-width soil body of a connecting channel in a segmented mode, spraying concrete to an excavated area, and arranging a straight-wall door type grating arch frame for primary support;
9) excavating the other half of soil body and carrying out primary support, excavating the soil body with the other half width of the connecting channel by adopting the method in the step 8), hanging a reinforcing mesh and spraying concrete on the excavated area, and arranging a straight-wall L-shaped grid arch center for carrying out primary support;
10) constructing a connecting channel structure, namely constructing a bottom plate of the connecting channel structure, and constructing side walls and a top plate of the connecting channel structure;
11) dismantling the support, namely dismantling the support part of the straight wall door type grating arch center exposed in the connecting channel;
12) repeating the steps 8) to 11) until the excavation and the structure construction of the whole connecting channel are completed;
13) and (4) removing the outer wall and the enclosure structure of the underground structure at the other end of the connecting channel, namely completing the construction of the connecting channel.
2. The method for constructing the connecting channel of the existing underground structure in the weak water-rich stratum according to claim 1, wherein in the step 2), the soft soil reinforcement thickness at the bottom of the connecting channel is determined according to the checking calculation of the bearing capacity of the foundation and the bearing capacity of the weak subjacent layer and is not less than 3 m.
3. The method for constructing the connecting channel of the existing underground structure in the weak water-rich stratum according to claim 1, wherein in the step 3), the reinforcing width of the soft soil above the connecting channel respectively exceeds the width of the waterproof curtains on the two sides by 1 m.
4. The method for constructing the connecting channel of the existing underground structure in the weak water-rich stratum as claimed in claim 1, wherein in the step 6), the structure is separated by using a row hole positioning through cutting at the boundary of the outer wall of the underground structure and the enclosure structure, the error is not more than 5mm, and the row hole depth is lower than 5cm below the bottom of the demolition area.
5. The method for constructing the connecting channel of the existing underground structure in the weak water-rich stratum as claimed in claim 1, wherein the step 7) comprises the following steps:
a. paying off, positioning and removing the part;
b. paying off to determine the size of underground structure blocks;
c. arranging a cutting hole and a hoisting hole of the drilling rope saw by adopting a hole arranging machine;
d. cutting the structure into blocks by adopting a wire saw;
e. and (5) hoisting the materials out for outward transportation.
6. The method for constructing a connecting channel of an existing underground structure in a weak water-rich stratum as claimed in claim 5, wherein the block plane size of the underground structure is not more than 1.5m x 1.5 m.
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| CN202010138982.6A CN111236310B (en) | 2020-03-03 | 2020-03-03 | Construction method of connecting channel of existing underground structure in weak water-rich stratum |
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| CN202010138982.6A CN111236310B (en) | 2020-03-03 | 2020-03-03 | Construction method of connecting channel of existing underground structure in weak water-rich stratum |
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| CN111236310B true CN111236310B (en) | 2021-03-30 |
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| CN113137084A (en) * | 2021-03-25 | 2021-07-20 | 中国建筑第八工程局有限公司 | Construction method for breaking common diaphragm wall next to underground outer wall of subway |
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| CN103924788B (en) * | 2014-05-06 | 2016-05-18 | 北京筑福国际工程技术有限责任公司 | Syndeton and construction method between existing building |
| CN209816867U (en) * | 2019-01-23 | 2019-12-20 | 中建一局集团第三建筑有限公司 | A supporting construction for peripheral foundation ditch of existing building |
| CN110486019B (en) * | 2019-07-22 | 2020-11-06 | 上海建工一建集团有限公司 | Underground excavation construction method for additionally arranging underground communication channels between new buildings and old buildings |
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