CN113187552B - Blocking construction method for oversized-diameter tunnel under water-rich stratum - Google Patents
Blocking construction method for oversized-diameter tunnel under water-rich stratum Download PDFInfo
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- CN113187552B CN113187552B CN202110643197.0A CN202110643197A CN113187552B CN 113187552 B CN113187552 B CN 113187552B CN 202110643197 A CN202110643197 A CN 202110643197A CN 113187552 B CN113187552 B CN 113187552B
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- plugging
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- precipitation
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- 238000010276 construction Methods 0.000 title claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 230000000903 blocking effect Effects 0.000 title claims abstract description 10
- 238000005553 drilling Methods 0.000 claims abstract description 17
- 239000004567 concrete Substances 0.000 claims abstract description 16
- 238000001556 precipitation Methods 0.000 claims abstract description 15
- 238000009412 basement excavation Methods 0.000 claims abstract description 4
- 238000005259 measurement Methods 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 19
- 239000010959 steel Substances 0.000 claims description 19
- 230000002787 reinforcement Effects 0.000 claims description 8
- 239000003673 groundwater Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 5
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 5
- 241001330002 Bambuseae Species 0.000 claims description 5
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 5
- 239000011425 bamboo Substances 0.000 claims description 5
- 239000011120 plywood Substances 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000002689 soil Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000005266 casting Methods 0.000 abstract description 3
- 239000011148 porous material Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002349 well water Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/103—Dams, e.g. for ventilation
-
- 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
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/003—Injection of material
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Geology (AREA)
- Geochemistry & Mineralogy (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention discloses a construction method for blocking an oversized-diameter tunnel under a water-rich stratum, which comprises the following steps: (1) determining a tunnel plugging section according to a construction plan, carrying out measurement paying off, making a plugging pile excavation mark (2) corresponding to the central position of the plugging section on the ground, carrying out stratum precipitation operation by downwards constructing two precipitation wells on the ground, wherein the precipitation wells are respectively positioned on two sides of a tunnel near the plugging pile, constructing the plugging pile until the depth of the precipitation well reaches the bottom (3) of the tunnel according to the marked position, drilling the plugging pile until the top (4) of the tunnel, inserting a pump pipe, extending the tail end of the pump pipe into the tunnel, installing a template and a supporting system in the tunnel, and casting plugging section concrete through the pump pipe to finish construction. The invention is simple and feasible, safe and reliable, can avoid a large amount of water from rushing into the pipeline, better isolates the underground water from the pipeline, can also avoid the pipeline from generating cracks to be broken, ensures the integrity of the pipeline, and reduces the potential safety hazard.
Description
Technical Field
The invention relates to the technical field of underground pipeline plugging construction, in particular to a method for plugging construction of an oversized-diameter tunnel under a water-rich stratum.
Background
In the water-rich stratum with higher groundwater level, if the oversized-diameter reinforced concrete pipeline (with the diameter of more than 6 m) is buried in advance, the construction is needed to be performed in a partial area above the pipeline in the later stage, in order to ensure the construction safety, the groundwater is prevented from entering the pipeline in the later stage construction, the oversized pipeline is usually required to be plugged before the construction, and meanwhile, corresponding measures are needed to ensure that the pipeline outside the construction area is not damaged. The existing pipeline plugging modes are various, but plugging objects of the pipeline plugging modes are not the pipelines with the super-large diameters, when the plugging area of the pipeline is increased, risks in the plugging process are increased in multiple, and plugging is difficult to complete.
Disclosure of Invention
In order to solve the problems, the invention provides a safe and reliable construction method for blocking an oversized-diameter tunnel under a water-rich stratum with good blocking effect, which specifically adopts the following technical scheme:
the invention relates to a construction method for plugging an oversized-diameter tunnel under a water-rich stratum, which comprises the following steps:
firstly, determining a tunnel plugging section according to a construction plan, carrying out measurement paying-off, and making a plugging pile excavation mark corresponding to the central position of the plugging section on the ground;
secondly, performing stratum precipitation operation by constructing two precipitation wells downwards from the ground, wherein the precipitation wells are respectively positioned at two sides of a tunnel near the plugging pile, and the depth of the precipitation wells reaches the bottom of the tunnel;
thirdly, constructing a plugging pile according to the marked position, wherein the depth of the plugging pile reaches the top of the tunnel;
fourthly, drilling holes on the plugging piles, inserting pump pipes, and enabling the tail ends of the pump pipes to extend into the tunnels;
and fifthly, installing a template and a supporting system in the tunnel, and pouring the concrete of the plugging section through a pump pipe to finish construction.
The two ends of the dewatering well are solid pipes, and the middle is a flower pipe.
The stratum dewatering operation of the second step comprises the steps of arranging a submersible pump in a dewatering well, and draining groundwater through the submersible pump to enable the water level near the plugging section to be reduced below the top surface of the tunnel; if the water level does not reach the standard, grouting reinforcement operation is needed to be carried out in the soil around the plugging pile.
The grouting reinforcement operation comprises the steps of excavating a plurality of vertical holes equidistant from the center of the plugging pile and grouting reinforcement into the vertical holes.
The construction plugging pile in the third step comprises the steps of firstly adopting a rotary drilling rig for construction and then backfilling C15 concrete.
And fourthly, drilling holes on the plugging piles by adopting a geological drilling machine.
And in the fifth step, the concrete of the plugging section is poured from bottom to top in a segmented manner.
The template and the supporting system comprise channel steel, bamboo plywood and square timber arranged at two ends of the plugging section, paired connecting pieces are arranged on the square timber, opposite-pull steel bars penetrating through the plugging section are arranged between the connecting pieces, and inclined supporting steel pipes connected with the bottom surface of the tunnel are arranged at the other end of each connecting piece.
The construction method for blocking the oversized-diameter tunnel under the water-rich stratum is simple, easy to operate, safe and reliable, adopts plain concrete for blocking, and can prevent a large amount of water from rushing into the pipeline during blocking construction; the plugging structure is stable and firm, does not need brick construction, and greatly saves construction cost; during later construction, underground water and the pipeline can be well isolated, cracks generated in the pipeline can be avoided from being broken, the integrity of the pipeline is ensured, and potential safety hazards are reduced.
Drawings
FIG. 1 is a schematic diagram of the present invention for performing precipitation operations on a formation.
Fig. 2 is a cross-sectional view of the ground water line m of fig. 1.
Fig. 3 is a schematic view of a construction pile according to the present invention.
Fig. 4 is a schematic view of a drilled hole in a plugged pile according to the present invention.
Fig. 5 is a schematic illustration of a cartridge pump tube according to the present invention.
Fig. 6-8 are schematic views of the present invention for casting the concrete of the plugging section in sections.
Detailed Description
The following describes embodiments of the present invention in detail with reference to the accompanying drawings, and the embodiments and specific construction processes of the present invention are given by implementing the embodiments on the premise of the technical solution of the present invention, but the scope of protection of the present invention is not limited to the following embodiments.
Example 1:
as shown in fig. 1, when a station is constructed on a subway line No. two in a certain city, a tunnel 1 passes through first and then serves as a station main body. The ground water level m of the station is about 7 meters below the ground, the pipe diameter of the shield segment of the tunnel 1 is 6.25 meters, the wall thickness is 35cm, the burial depth is about 9 meters below the ground, and the shield segment collides with the station guard post. If the tunnel 1 is not blocked, the drilling grouting slurry can be lost in a large amount when the station fender post is constructed, so that the fender post concrete cannot be poured to the designed elevation, and meanwhile, a large amount of sediment and underground water can be poured into the tunnel 1 to influence the later use of the tunnel 1. Therefore, the shield tunnel 1 needs to be blocked before the station guard piles are constructed.
When the construction is carried out by adopting the method for plugging the oversized-diameter tunnel under the water-rich stratum, the method comprises the following steps shown in figures 1-8:
firstly, determining a plugging section 2 of a tunnel 1 according to a construction plan, carrying out measurement paying-off, and making a plugging pile 3 excavation mark corresponding to the central position of the plugging section 2 on the ground;
secondly, constructing two precipitation wells 4 downwards from the ground to perform stratum precipitation operation;
the dewatering wells 4 are respectively positioned at two sides of the tunnel 1 near the plugging piles 3, and the depth of the dewatering wells 4 reaches the bottom of the tunnel 1. Under normal conditions, the dewatering wells 4 are arranged at a distance of 2-5m from the central line of the plugging pile 3, the two ends of each dewatering well 4 are all solid pipes, and the middle part of each dewatering well is provided with a flower pipe which is convenient for water seepage. After the construction of the dewatering well 4 is completed, a submersible pump is placed in the dewatering well, and groundwater is discharged outside the submersible pump, so that the water level n near the plugging section 2 is reduced below the top surface of the tunnel 1; if the descending water level does not reach the standard, grouting reinforcement operation is needed to be carried out in the soil body in the range of 2m around the plugging pile 3, namely, a plurality of vertical holes 5 equidistant from the center of the plugging pile 3 are excavated, and grouting reinforcement is carried out in the vertical holes 5.
Thirdly, constructing a plugging pile 3 according to the marked position, wherein the diameter of the plugging pile 3 is 800mm, and the depth reaches the top of the tunnel 1;
the plugging pile 3 is constructed by adopting a rotary drilling rig, the rotary drilling rig is firstly put in place, and then the construction is carried out according to the sequence of burying pile casing, drilling, pore forming, pore cleaning, backfilling C15 concrete and pouring waterproof concrete;
fourthly, drilling holes on the plugging piles 3, and inserting a pump pipe 6 of which the tail end extends into the tunnel 1;
specifically, the geological drilling machine is put in place, core drilling is carried out on the central position of the plugging pile 3 until the top position of the tunnel 1 is reached, and the shield segments are cut to penetrate through the tunnel 1. The diameter of the drilling hole is 200mm.
And fifthly, installing a template and a supporting system in the tunnel 1, and then pouring the concrete of the plugging section 2 from bottom to top in a segmented manner through a pump pipe 6 to finish construction.
The formwork and support system includes channel steel 701, bamboo plywood 702 and square lumber 703 at both ends of the plugging section. The channel steel 701 is vertically supported and is arranged at intervals along the plugging surface; the bamboo plywood 702 and the square timber 703 are sequentially arranged outside the channel steel 701. The square timber 703 is provided with double-spliced steel pipes 704 as connecting pieces, the double-spliced steel pipes 704 are arranged in pairs, each pair of double-spliced steel pipes 704 is connected through a pair of pull steel bars 705 penetrating through the plugging section 2, and the other end of each double-spliced steel pipe 704 is provided with an inclined supporting steel pipe 706 connected with the bottom surface of the tunnel 1.
In this embodiment, the concrete in the plugging section 2 is cast in three sections, the bamboo plywood 702, the square lumber 703, the opposite-pull steel bars 705 and the inclined support steel pipes 706 are installed from bottom to top section by section, the opposite-pull steel bars 705 are cast in the concrete, and the inclined support steel pipes 706 are removed after the casting of the concrete in the section is completed.
It should be noted that, in the description of the present invention, terms such as "front", "rear", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Claims (1)
1. A construction method for blocking an oversized-diameter tunnel under a water-rich stratum is characterized by comprising the following steps of: the method comprises the following steps:
firstly, determining a tunnel plugging section according to a construction plan, carrying out measurement paying-off, and making a plugging pile excavation mark corresponding to the central position of the plugging section on the ground;
secondly, performing stratum precipitation operation by constructing two precipitation wells downwards from the ground, wherein the precipitation wells are respectively positioned at two sides of a tunnel near the plugging pile, and the depth of the precipitation wells reaches the bottom of the tunnel;
thirdly, constructing a plugging pile according to the marked position, wherein the depth of the plugging pile reaches the top of the tunnel;
fourthly, drilling holes on the plugging piles, inserting pump pipes, and enabling the tail ends of the pump pipes to extend into the tunnels;
fifthly, installing a template and a supporting system in the tunnel, and pouring the concrete of the plugging section through a pump pipe to finish construction;
the two ends of the dewatering well are solid pipes, and the middle is a flower pipe;
the stratum dewatering operation of the second step comprises the steps of arranging a submersible pump in a dewatering well, and draining groundwater through the submersible pump to enable the water level near the plugging section to be reduced below the top surface of the tunnel; if the water level does not reach the standard, grouting reinforcement operation is needed to be carried out in the soil around the plugging pile;
the grouting reinforcement operation comprises the steps of excavating a plurality of vertical holes equidistant from the center of the plugging pile, and grouting reinforcement is carried out in the vertical holes;
the construction blocking pile in the third step comprises the steps of firstly adopting a rotary drilling rig for construction and then backfilling C15 concrete;
drilling holes on the plugging piles by adopting a geological drilling machine;
in the fifth step, the concrete of the plugging section is poured from bottom to top in a segmented manner;
the template and the supporting system comprise channel steel, bamboo plywood and square timber arranged at two ends of the plugging section, paired connecting pieces are arranged on the square timber, opposite-pull steel bars penetrating through the plugging section are arranged between the connecting pieces, and inclined supporting steel pipes connected with the bottom surface of the tunnel are arranged at the other end of each connecting piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110643197.0A CN113187552B (en) | 2021-06-09 | 2021-06-09 | Blocking construction method for oversized-diameter tunnel under water-rich stratum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110643197.0A CN113187552B (en) | 2021-06-09 | 2021-06-09 | Blocking construction method for oversized-diameter tunnel under water-rich stratum |
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| Publication Number | Publication Date |
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| CN113187552A CN113187552A (en) | 2021-07-30 |
| CN113187552B true CN113187552B (en) | 2024-04-02 |
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| CN202110643197.0A Active CN113187552B (en) | 2021-06-09 | 2021-06-09 | Blocking construction method for oversized-diameter tunnel under water-rich stratum |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114482105B (en) * | 2022-03-18 | 2024-04-16 | 中铁一局集团有限公司 | Precipitation well group plugging construction method with strong pressurized water after ultra-deep subway station is closed |
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