CN116517600A - Temporary plugging structure for tunnel staged construction and construction method thereof - Google Patents

Temporary plugging structure for tunnel staged construction and construction method thereof Download PDF

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Publication number
CN116517600A
CN116517600A CN202310304765.3A CN202310304765A CN116517600A CN 116517600 A CN116517600 A CN 116517600A CN 202310304765 A CN202310304765 A CN 202310304765A CN 116517600 A CN116517600 A CN 116517600A
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China
Prior art keywords
construction
wall
tunnel section
main body
plugging
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Pending
Application number
CN202310304765.3A
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Chinese (zh)
Inventor
杨国松
王海林
贾建伟
杨雄
蒋胜波
陈兆
张兆远
马军秋
张鑫
万志文
孙玉龙
敬怀珺
刘羿辰
汪敬
谭师好
蒋源
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China Construction Sixth Engineering Division Co Ltd
Hunan Provincial Communications Planning Survey and Design Institute Co Ltd
Original Assignee
China Construction Sixth Engineering Division Co Ltd
Hunan Provincial Communications Planning Survey and Design Institute Co Ltd
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Publication date
Application filed by China Construction Sixth Engineering Division Co Ltd, Hunan Provincial Communications Planning Survey and Design Institute Co Ltd filed Critical China Construction Sixth Engineering Division Co Ltd
Priority to CN202310304765.3A priority Critical patent/CN116517600A/en
Publication of CN116517600A publication Critical patent/CN116517600A/en
Pending legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
    • 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
    • E02D29/00—Independent underground or underwater structures; Retaining walls
    • E02D29/02—Retaining or protecting walls
    • 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
    • E02D3/02—Improving by compacting
    • E02D3/046—Improving by compacting by tamping or vibrating, e.g. with auxiliary watering of the soil
    • 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
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/10—Sealing or packing boreholes or wells in the borehole
    • E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
    • 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

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Structural Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Civil Engineering (AREA)
  • Paleontology (AREA)
  • General Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Hydrology & Water Resources (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Architecture (AREA)
  • Agronomy & Crop Science (AREA)
  • Soil Sciences (AREA)
  • Lining And Supports For Tunnels (AREA)

Abstract

The invention provides a temporary blocking structure for tunnel staged construction and a construction method thereof, comprising a pre-construction tunnel section, a waterproof component and a blocking component, wherein the blocking component comprises a main body blocking wall and a blocking wall, the main body blocking wall is matched with an opening of the pre-construction tunnel section, the upper part of the main body blocking wall is connected with a top plate of the pre-construction tunnel section, the lower part of the main body blocking wall is connected with a bottom plate of the pre-construction tunnel section, the blocking wall is blocked on the side surface of the main body blocking wall far away from the pre-construction tunnel section, the waterproof component comprises a water stopping piece and an impermeable piece, the water stopping piece is blocked on the side of the blocking wall far away from the pre-construction tunnel section, a reserved interface unit for installing the impermeable piece is arranged between the main body blocking wall and the pre-construction tunnel section, and the impermeable piece is arranged in the reserved interface unit. So the water of accessible later stage construction tunnel section is prevented to flow into to earlier stage construction tunnel section to through setting up the prevention of seepage piece, improved the water-proof effects of seam crossing effectively.

Description

Temporary plugging structure for tunnel staged construction and construction method thereof
Technical Field
The invention relates to the technical field of tunnel staged construction, in particular to a temporary plugging structure for tunnel staged construction and a construction method.
Background
Along with the continuous development of tunnel engineering construction in China, foundation pits are increasingly developed towards deep, large and the like, meanwhile, along with the continuous development of urban processes, more complex peripheral construction conditions are also faced during tunnel construction, the tunnel construction progress is limited by equipment conditions, funds and other factors, meanwhile, the influence on peripheral construction is reduced by considering how to ensure that tunnel construction reduces as much as possible, the influence on peripheral current roads is reduced, and tunnel staged construction is more common in cities for properly considering the factors.
The stage construction of the tunnel usually adopts temporary blocking structures such as row piles and the like, and the common blocking structure only takes the blocking structure as a temporary soil blocking measure, as shown in figure 1, in the prior art, a steel structure is usually embedded in top-bottom plate and side wall concrete on the side of the prior construction, and soil pressure on the non-excavated side is transferred to a main structure on the side of the prior construction through the steel structure; and excavating a foundation pit after the support on the construction side is erected, cutting off the plugging wall and the force transmission steel structure after the main body structure on the construction side is finished, and finally pouring concrete at the joint. When a middle-buried steel edge rubber water stop is arranged at the construction joint and the deformation joint to conduct waterproof facility layout, the reserved force transmission steel structure can damage the arrangement of constructional steel bars of the water stop, so that the water stop cannot be installed, and water on the non-construction side is leaked to the constructed side to be damaged; however, the foundation pit on the side of the construction is not backfilled in time, which can cause the risk of collapse of the foundation pit to be further aggravated due to overlong exposure time, so that the traffic passing of the road on the ground on the constructed side cannot be quickly recovered.
The temporary plugging structure does not consider that the plugging position has water seepage phenomenon when the plugging time is too long, and meanwhile, the plugging position is not fully reserved with a waterproof device, so that the plugging position becomes a long-term water seepage point; furthermore, the risk that the enclosure structure and the support may fail due to overlong exposure time of the foundation pit which is constructed in advance is not considered; in addition, the requirement of timely backfilling at the upper part of the pre-construction tunnel due to the requirement of traffic protection is not considered.
In view of this, there is a need to propose a solution or at least a alleviation of the above drawbacks.
Disclosure of Invention
The invention mainly aims to provide a temporary plugging structure for tunnel staged construction and a construction method thereof, which are used for solving the problem that a water stop belt cannot be installed in the temporary plugging structure for tunnel staged construction in the prior art, so that water on an un-constructed side seeps to the constructed side to cause damage.
In order to achieve the above purpose, the invention provides a temporary plugging structure for tunnel staged construction, which comprises a pre-construction tunnel section, a waterproof assembly and a plugging assembly, wherein the plugging assembly is used for plugging one end of the pre-construction tunnel section, which is close to the post-construction tunnel section; wherein,,
the plugging assembly comprises a main body plugging wall and a containment plugging wall, wherein the main body plugging wall is matched with the opening of the pre-construction tunnel section, the upper part of the main body plugging wall is connected with the top plate of the pre-construction tunnel section, and the lower part of the main body plugging wall is connected with the bottom plate of the pre-construction tunnel section;
the enclosure blocking wall is blocked on the side surface of the main body blocking wall, which is far away from the pre-construction tunnel section;
the waterproof assembly is used for preventing water of the later-stage construction tunnel section from seeping into the earlier-stage construction tunnel section, and comprises a water stopping piece and an impermeable piece which are respectively arranged on two sides of the main body plugging wall, wherein the water stopping piece is plugged on one side, far away from the earlier-stage construction tunnel section, of the enclosure plugging wall; a reserved interface unit for installing the seepage prevention piece is arranged between the main body plugging wall and the pre-construction tunnel section, and the seepage prevention piece is arranged in the reserved interface unit.
Preferably, the top end of the enclosure blocking wall extends to the ground, and the bottom end of the enclosure blocking wall extends downwards and is lower than the tunnel bottom plate.
Preferably, the reserved interface unit comprises a top plate tongue-and-groove, a side wall tongue-and-groove and a bottom plate tongue-and-groove, wherein,
the top plate rabbet is arranged between the main body blocking wall and the top plate of the pre-construction tunnel section, the side wall rabbet is arranged between the main body blocking wall and the side wall of the pre-construction tunnel section, and the bottom plate rabbet is arranged between the main body blocking wall and the bottom plate of the pre-construction tunnel section.
Preferably, the anti-seepage member is a middle-buried steel edge rubber water stop belt, and the middle-buried steel edge rubber water stop belts are respectively arranged in the top plate tongue-and-groove, the side wall tongue-and-groove and the bottom plate tongue-and-groove in a one-to-one correspondence manner.
Preferably, a reinforced hidden beam extending transversely along the tunnel is further arranged in the top of the pre-construction tunnel section, and the reinforced hidden beam is arranged at one end, close to the main body plugging wall, in the top plate of the pre-construction tunnel section.
Preferably, the tunnel construction device further comprises a cantilever type retaining wall which is arranged along the transverse extension of the tunnel, wherein the cantilever type retaining wall is arranged on the top plate of the tunnel section of the pre-construction, the cantilever type retaining wall comprises a fixed end and a free end, the fixed end is fixedly connected with the reinforced hidden beam, and the free end is arranged in an upward extension mode from the fixed end.
Preferably, a backfill space for filling backfill soil is formed between one side of the cantilever retaining wall far away from the main body blocking wall and the top plate of the pre-construction tunnel section in a surrounding manner, and a sand filling space for filling sand is formed between one side of the cantilever retaining wall close to the main body blocking wall, the top plate of the pre-construction tunnel section and the main body blocking wall in a surrounding manner.
Preferably, the water stopping piece is a water curtain, and the water curtain adopts one of a jet grouting pile and a stirring pile.
The invention also provides a construction method of the temporary plugging structure for the tunnel staged construction, which is applied to the temporary plugging structure for the tunnel staged construction and comprises the following steps:
s1, constructing the water stop piece at a first preset distance from the pre-construction tunnel section, wherein the water stop piece extends vertically and is positioned at one end of the post-construction tunnel section; wherein, the water stopping piece is a water curtain;
s2, constructing the enclosure blocking wall;
s3, excavating foundation pits and constructing inner supports for the pre-construction tunnel section successively;
s4, constructing a bottom plate of the pre-construction tunnel section, a side wall close to the bottom and a main body plugging wall structure close to the bottom, and reserving a bottom plate tongue-and-groove and a side wall tongue-and-groove; the bottom plate rabbet is arranged between the main body blocking wall and the bottom plate of the pre-construction tunnel section, and the side wall rabbet is arranged between the main body blocking wall and the side wall of the pre-construction tunnel section;
s5, embedding an anti-seepage piece to the positions of the bottom plate rabbet and the side wall rabbet; wherein the seepage-proofing member is a middle-buried steel edge rubber water stop belt;
s6, sequentially removing the inner support by adopting a forward method, and pouring the side wall above the bottom of the pre-construction tunnel section and the main body plugging wall structure in the middle;
s7, embedding reinforcing hidden beam steel bars and reserving a top plate rabbet; the top plate rabbet is arranged between the main body plugging wall and the top plate of the pre-construction tunnel section;
s8, embedding the embedded steel edge rubber water stop to the positions of the top plate rabbet and the side wall rabbet;
s9, pouring a top plate and a main body plugging wall structure above the middle part.
Preferably, the step S9 further includes the step of:
s10, constructing the cantilever type retaining wall;
s11, fine sand backfilling is carried out on the sand filling space, and manual ramming and soil filling are carried out on the backfilling space.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a temporary blocking structure for tunnel staged construction, which comprises a pre-construction tunnel section, a waterproof component and a blocking component, wherein the blocking component comprises a main body blocking wall and a blocking wall, the main body blocking wall is matched with a hole of the pre-construction tunnel section, the upper part of the main body blocking wall is connected with a top plate of the pre-construction tunnel section, the lower part of the main body blocking wall is connected with a bottom plate of the pre-construction tunnel section, the blocking wall is blocked on the side surface of the main body blocking wall far away from the pre-construction tunnel section, the waterproof component comprises a water stopping piece and an impermeable piece which are respectively arranged on two sides of the main body blocking wall, the water stopping piece is blocked on one side of the blocking wall far away from the pre-construction tunnel section, a reserved interface unit for installing the impermeable piece is arranged between the main body blocking wall and the pre-construction tunnel section, and the impermeable piece is arranged in the reserved interface unit. So the water of accessible sealing member prevention later stage construction tunnel section flows into to earlier stage construction tunnel section to through setting up the waterproof effect of prevention of seepage piece department has improved seam crossing effectively, thereby avoid groundwater infiltration earlier stage construction tunnel section to corrode relevant atress member, with the security performance of improvement structure, improve tunnel engineering's construction quality and durability.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a prior art plugging structure;
fig. 2 is an application scenario diagram of a temporary plugging structure according to an embodiment of the present invention;
FIG. 3 is a schematic view of a cantilever retaining wall according to an embodiment of the present invention;
fig. 4 is a schematic structural view of a waterproof curtain according to an embodiment of the present invention.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Reference numerals illustrate:
10. a plugging assembly; 110. a main body plugging wall; 120. a blocking wall is enclosed; 20. a waterproof assembly; 210. a water stop member; 220. an impermeable member; 30. pre-constructing a tunnel section; 310. a top plate; 311. reinforcing the hidden beam; 312. cantilever type retaining wall; 320. a bottom plate; 330. backfilling the space; 340. sand filling space; 40. and (5) constructing a tunnel section in the later period.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
Referring to fig. 1-4, a temporary plugging structure for staged construction of a tunnel according to an embodiment of the present invention includes a pre-construction tunnel section 30, a waterproof assembly 20, and a plugging assembly 10 for plugging an end of the pre-construction tunnel section 30 near a post-construction tunnel section 40. First, the pre-construction tunnel segment 30 of the present application refers to a segment that has been constructed during the construction of the tunnel in stages, and the post-construction tunnel segment 40 refers to a segment that has not been excavated during the construction of the tunnel in stages. The method is different from the prior art that a steel structure is usually embedded in top-bottom plate and side wall concrete of the pre-construction side, and soil pressure of the non-excavated side is transmitted to a main structure of the pre-construction side through the steel structure; and excavating a foundation pit after the support on the construction side is erected, cutting off the plugging wall and the force transmission steel structure after the main structure on the construction side is finished, and finally pouring concrete at the joint, wherein the concrete is shown in the figure 1. When a middle-buried steel edge rubber water stop is arranged at the construction joint and the deformation joint to conduct waterproof facility layout, the reserved force transmission steel structure can damage the arrangement of constructional steel bars of the water stop, so that the water stop cannot be installed, and water on the non-construction side is leaked to the constructed side to be damaged; however, the foundation pit on the side of the construction is not backfilled in time, which can cause the risk of collapse of the foundation pit to be further aggravated due to overlong exposure time, so that the traffic passing of the road on the ground on the constructed side cannot be quickly recovered. The temporary plugging structure for the tunnel staged construction is arranged to solve the defects in the prior art. The method comprises the following steps:
the plugging assembly 10 comprises a main body plugging wall 110 and a containment plugging wall 120, wherein the main body plugging wall 110 is matched with the hole of the pre-construction tunnel section 30, the upper part of the main body plugging wall 110 is connected with the top plate 310 of the pre-construction tunnel section, and the lower part of the main body plugging wall 110 is connected with the bottom plate 320 of the pre-construction tunnel section; the enclosure blocking wall 120 is blocked at the side of the main body blocking wall 110 away from the pre-construction tunnel section 30.
Specifically, the plugging assembly 10 is used as a temporary plugging structure for staged construction, and comprises a main body plugging wall 110 and a containment plugging wall 120, wherein the main body plugging wall 110 is used for bearing the soil pressure at one side of the post-construction tunnel section 40, and the upper part of the main body plugging wall 110 is connected with the top plate 310 of the pre-construction tunnel section, and the lower part of the main body plugging wall 110 is connected with the bottom plate 320 of the pre-construction tunnel section, so that the soil pressure at one side of the post-construction tunnel section 40 is transmitted to the main body structure of the pre-construction tunnel section 30 through the main body plugging wall 110, and in addition, the main body plugging wall 110 is matched with the hole of the pre-construction tunnel section 30, so that the risk of water seepage and soil seepage caused by gaps due to the mismatching of the hole is avoided.
The enclosure blocking wall 120 is used for enclosing one side of the pre-construction tunnel section 30, so as to prevent soil of the post-construction tunnel section 40 from falling into the pre-construction tunnel section 30, therefore, the enclosure blocking wall 120 is blocked on the side surface of the main body blocking wall 110 away from the pre-construction tunnel section 30, and it is worth noting that the enclosure blocking wall 120 can adopt a pile-arranging form, and has the advantages of flexible planar arrangement, simple construction process, low cost, small vibration and extrusion to soil mass, and the like, and is a common form in the enclosure wall structure.
The waterproof assembly 20 is configured to prevent water in the post-construction tunnel section 40 from leaking into the pre-construction tunnel section 30, the waterproof assembly 20 includes a water stop member 210 and a seepage prevention member 220 respectively disposed on two sides of the main body blocking wall 110, and the water stop member 210 is blocked on one side of the enclosure blocking wall 120 away from the pre-construction tunnel section 30; a reserved interface unit for installing the impermeable member 220 is arranged between the main body plugging wall 110 and the pre-construction tunnel section 30, and the impermeable member 220 is arranged in the reserved interface unit.
In detail, the waterproof assembly 20 is used for preventing water in the post-construction tunnel section 40 from flowing to the pre-construction tunnel section 30, and comprises a waterproof member 210 and an impermeable member 220, the waterproof member 210 and the impermeable member 220 are respectively disposed on two sides of the main body blocking wall 110, the waterproof member 210 is used for isolating groundwater on one side of the post-construction tunnel section 40, so that the waterproof member is blocked on one side of the enclosure blocking wall 120 far from the pre-construction tunnel section 30, and is disposed between the post-construction tunnel section 40 and the enclosure blocking wall 120, it is worth mentioning that the waterproof member 210 is used for sealing water in a waterproof curtain manner, the waterproof curtain can be a rotary spraying pile or a stirring pile with a diameter of 850@600mm under geological conditions, the rotary spraying pile has the advantages of simple construction, high efficiency, low cost, good strength and good durability, and the stirring pile has good waterproof capability when used as a waterproof curtain, and the impermeable curtain can be determined according to specific conditions of the skilled person in the art.
The anti-seepage member 220 is used for guaranteeing a waterproof effect at a joint, and preventing water from penetrating into a main body structure through the joint, so that a reserved interface unit for installing the anti-seepage member 220 is required to be arranged between the main body plugging wall 110 and the pre-construction tunnel section 30, so that the anti-seepage member 220 is arranged in the reserved interface unit, and the anti-seepage member 220 is different from the prior art, so that the anti-seepage member 220 is inconvenient to install, and has a good water stopping and anti-seepage effect.
As a preferred embodiment of the present invention, the top end of the enclosure wall 120 extends to the road surface, and the bottom end of the enclosure wall 120 extends downward and is disposed below the tunnel bottom plate 320. It should be understood that the top end of the enclosure blocking wall 120 extends to the ground, so that the enclosure blocking wall 120 can act as a support for the road surface while being used as soil at one side of the construction section of the tunnel in the later stage of blocking, and the bottom end of the enclosure blocking wall 120 extends downwards and is lower than the tunnel bottom plate 320, so that a part of the pressure received by the support can be transferred to the geology below the bottom plate 320, and the bearing pressure is shared.
As a preferred embodiment of the present invention, the reserved interface unit includes a top plate tongue-and-groove, a side wall tongue-and-groove, and a bottom plate tongue-and-groove, wherein the top plate tongue-and-groove is disposed between the main body blocking wall 110 and the top plate 310 of the pre-construction tunnel section, the side wall tongue-and-groove is disposed between the main body blocking wall 110 and the side wall of the pre-construction tunnel section 30, and the bottom plate tongue-and-groove is disposed between the main body blocking wall 110 and the bottom plate 320 of the pre-construction tunnel section.
It should be noted that, the reserved interface unit is used for installing the anti-seepage member 220, and adopts a mode of reserving a tongue-and-groove at a joint, so that the tongue-and-groove is reserved in advance when the pre-construction tunnel section 30 is constructed, thereby facilitating the installation of the anti-seepage member 220, and the anti-seepage member 220 is also installed in a corresponding tongue-and-groove mode when the main body blocking wall 110 is constructed, and at this time, the anti-seepage member 220 is arranged between the pre-construction tunnel section 30 and the main body blocking wall 110, so as to achieve the anti-seepage effect.
The rabbets are reserved between the main body blocking wall 110 and the top plate 310, the side walls and the bottom plate 320 of the pre-construction tunnel section, the top plate rabbets are arranged between the main body blocking wall 110 and the top plate 310 of the pre-construction tunnel section, the side wall rabbets are arranged between the main body blocking wall 110 and the side walls of the pre-construction tunnel section 30, and the bottom plate rabbets are arranged between the main body blocking wall 110 and the bottom plate 320 of the pre-construction tunnel section.
It should be noted that the height of the top plate tongue-and-groove is half the thickness of the top plate 310 of the pre-construction tunnel section, the width of the side wall tongue-and-groove is half the thickness of the side wall of the pre-construction tunnel section 30, and the height of the bottom plate tongue-and-groove is half the thickness of the bottom plate 320 of the pre-construction tunnel section, which is more beneficial for the layout and installation of the impermeable member 220 and the butt installation of the main body plugging wall 110.
As a preferred embodiment of the present invention, the anti-seepage member 220 is a middle-buried steel edge rubber water stop, and the middle-buried steel edge rubber water stop is respectively disposed in the top plate tongue-and-groove, the side wall tongue-and-groove and the bottom plate tongue-and-groove in a one-to-one correspondence manner. It should be noted that, the anti-seepage member 220 adopts a middle-buried steel edge rubber water stop, and the middle rubber body of the middle-buried steel edge water stop is compressed, stretched and deformed when the structure is deformed, so as to play a role in sealing and stopping water; the galvanized steel side band has good adhesiveness with concrete, is not easy to fall off and loose, so that the water stop belt can bear larger tensile force and torsion, and as no new leakage seam is generated between the steel belt and the concrete and between the steel belt and the rubber, the steel side rubber water stop belt enhances the seepage prevention performance of structural deformation, has good self-qualification after installation, is a better choice in the seepage prevention piece 220, and can also be selected by a person skilled in the art according to actual conditions.
As a preferred embodiment of the present invention, a reinforcing hidden beam 311 extending in the transverse direction of the tunnel is further applied to the top of the pre-construction tunnel section 30, and the reinforcing hidden beam 311 is disposed at one end of the top plate 310 of the pre-construction tunnel section 30 near the main body blocking wall 110. It should be noted that the reinforcing hidden beam 311 is used to increase the bending resistance of the top plate 310 of the pre-construction tunnel section 30 and is also used for installing the post-cantilever retaining wall 312, so that the reinforcing steel bar grade of the reinforcing hidden beam 311 should be at least one level higher than the main reinforcing steel bar grade of the top plate 310 of the pre-construction tunnel section when the reinforcing steel bar of the reinforcing hidden beam 311 is pre-buried, so as to increase the strength.
As a preferred embodiment of the present invention, the present invention further includes a cantilever type retaining wall 312 extending transversely along the tunnel, the cantilever type retaining wall 312 is disposed on the top plate 310 of the pre-construction tunnel section, the cantilever type retaining wall 312 includes a fixed end fixedly connected with the reinforcing hidden beam 311 and a free end extending upward from the fixed end.
It should be noted that, in order to ensure that the road above the pre-construction tunnel section 30 can normally pass, the backfill construction is performed between the top plate 310 of the pre-construction tunnel section and the road surface, so that the cantilever retaining wall 312 needs to be added to bear the pressure of the backfill, so as to ensure that the foundation pit of the post-construction tunnel section 40 can be smoothly excavated while the upper traffic passes.
The cantilever type retaining wall 312 is disposed on the top plate 310 of the pre-construction tunnel section and comprises a fixed end and a free end, the fixed end is fixedly connected with the reinforced hidden beam 311, the width of the fixed end is consistent with that of the reinforced hidden beam 311, and the free end extends upwards from the fixed end to form the cantilever type retaining wall 312.
Further, a backfill space 330 for filling backfill is formed between a side of the cantilever retaining wall 312 far from the main body blocking wall 110 and the top plate 310 of the pre-construction tunnel section, and a sand filling space 340 for filling sand is formed between a side of the cantilever retaining wall 312 close to the main body blocking wall 110 and the top plate 310 of the pre-construction tunnel section and the main body blocking wall 110. It should be noted that, a backfill space 330 for filling backfill is formed between the side of the cantilever retaining wall 312 far from the main body blocking wall 110 and the top plate 310 of the pre-construction tunnel section, and the backfill space 330 is filled with manually rammed soil; the cantilever retaining wall 312 is formed with a sand filling space 340 for filling sand between one side of the main body blocking wall 110, the top plate 310 of the pre-construction tunnel section and the main body blocking wall 110, and the sand filling space 340 is backfilled by fine sand, so that the load of backfilling water and soil pressure on the cantilever retaining wall 312 is reduced as much as possible, the water and soil pressure on two sides of the cantilever retaining wall is balanced as much as possible, and the cleaning is convenient in the later construction, and the influence on the embedded steel edge rubber water stop belt is reduced; when the backfill reaches the structural strength requirement, the road surface above the backfill can recover traffic, and the traffic pressure of the road near the construction is relieved.
The invention also provides a construction method of the temporary plugging structure for the tunnel staged construction, which is applied to the temporary plugging structure for the tunnel staged construction and comprises the following steps:
s1, applying the water stop piece 210 at a first preset distance from the pre-construction tunnel section 30, wherein the water stop piece 210 extends vertically and is positioned at one end of the post-construction tunnel section 40; wherein, the water stop 210 is a water curtain; it should be noted that, when the entire temporary plugging structure is constructed, a waterproof curtain is firstly applied at a first preset distance from the pre-construction tunnel section 30, the first preset distance should be a reserved space of the plugging assembly 10, and the waterproof curtain may be a jet grouting pile or a stirring pile with a diameter of 850@600mm according to geological conditions.
S2, constructing the enclosure blocking wall 120; it should be noted that, after the waterproof curtain reaches the design strength, the enclosure blocking wall 120 may be started to be applied, and the enclosure blocking wall 120 may be in a pile arrangement mode.
S3, excavating foundation pits and constructing inner supports for the pre-construction tunnel section 30 successively; it should be understood that the excavation of foundation pit and the construction of internal support according to the construction process are well known to those skilled in the art, and thus will not be described in detail herein.
S4, constructing a bottom plate 320, a side wall close to the bottom and a main body plugging wall 110 structure close to the bottom of the pre-construction tunnel section, and reserving a bottom plate tongue-and-groove and a side wall tongue-and-groove; wherein the bottom plate tongue-and-groove is arranged between the main body blocking wall 110 and the bottom plate 320 of the pre-construction tunnel section, and the side wall tongue-and-groove is arranged between the main body blocking wall 110 and the side wall of the pre-construction tunnel section 30; it should be noted that, when the bottom plate 320, the side wall close to the bottom, and the main body plugging wall structure close to the bottom of the pre-construction tunnel section are implemented, the tongue-and-groove is pre-embedded for the next step of installing the embedded steel edge rubber water stop, wherein the height of the tongue-and-groove of the bottom plate is half of the height of the bottom plate 320 of the pre-construction tunnel section, and the height of the tongue-and-groove of the side wall is half of the thickness of the side wall of the pre-construction tunnel section 30; the side wall close to the bottom is constructed from the bottom upwards, the main body plugging wall structure close to the bottom is constructed from the bottom upwards, and the construction from the bottom upwards can be more convenient; it should be noted that, before the main body plugging wall 110 is applied, the protection plugging wall 120 needs to be roughened and leveled to increase the adhesion between the concrete of the post-cast main body plugging wall 110 and the concrete of the protection plugging wall 120, eliminate seams, and ensure quality.
S5, embedding the anti-seepage piece 220 to the positions of the bottom plate rabbet and the side wall rabbet; wherein, the seepage-proofing member 220 is a middle-buried steel edge rubber water stop;
s6, sequentially removing the inner supports by adopting a forward method, and pouring the main body plugging wall 110 structures of the side walls above the bottom and the middle of the pre-construction tunnel section 30; wherein the top plate tongue-and-groove is disposed between the main body blocking wall 110 and the top plate 310 of the pre-construction tunnel section; it should be noted that, the inner support and pouring of the side wall and the top plate 310 of the pre-construction tunnel section 30 can be sequentially removed by adopting a forward method, and the forward method has the advantages of simple, quick, economical and safe construction, and is a common tunnel construction technology; and the height of the top plate rabbet is half of the height of the top plate 310 of the pre-construction tunnel section; the main body blocking wall 110 structure in the middle refers to a middle structure above the main body blocking wall 110 near the bottom which is constructed but below the main body blocking wall 110 near the top which is not constructed.
S7, embedding reinforcing hidden beam steel bars 311 and reserving a top plate rabbet; it should be noted that, the pre-embedded position of the reinforcing steel bars of the reinforcing hidden beam 311 is disposed at one end of the top of the pre-constructed tunnel section 30 near the main body plugging wall 110, so as to define the position of the cantilever retaining wall 312 later, and the reinforcing steel bars of the reinforcing hidden beam 311 should be at least one level higher than the main steel bars of the top plate 310 to ensure the strength because the cantilever retaining wall 312 needs to be added to the reinforcing hidden beam 311.
S8, embedding the embedded steel edge rubber water stop to the positions of the top plate rabbet and the side wall rabbet; it is worth mentioning that care should be taken to protect the centrally buried steel edge rubber water stop during the process of carrying out reinforcement binding and concrete pouring.
S9, pouring the top plate 310 and the main body plugging wall 110 structure above the middle part. The main body blocking wall 110 structure above the middle part refers to a main body blocking wall 110 structure near the top which is left to be under construction.
Further, the step S9 further includes the steps of:
s10, constructing the cantilever type retaining wall 312; it should be noted that, the thickness of the fixed end of the cantilever retaining wall 312 should be consistent with the width of the reinforcing hidden beam 311, the vertical steel bars of the cantilever retaining wall 312 should be anchored into the top plate 310, and the anchoring depth should meet the standard requirement, and a certain interval should be left between the height of the retaining wall and the road surface, so that the structures such as underground pipelines can be buried in the later stage, and the height of the cantilever retaining wall should not exceed 8m, which is only used as an aid for those skilled in the art to understand, and the specific value can be set according to the practical situation.
S11, fine sand backfilling is carried out on the sand filling space 340, and manual ramming and soil filling are carried out on the backfilling space 330; it can be understood that the backfilling work can be performed after each concrete structure reaches the design strength, and the related backfilling technical indexes all need to meet the design requirements.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.

Claims (10)

1. The temporary plugging structure for the tunnel staged construction is characterized by comprising a pre-construction tunnel section, a waterproof assembly and a plugging assembly, wherein the plugging assembly is used for plugging one end, close to the post-construction tunnel section, of the pre-construction tunnel section; wherein,,
the plugging assembly comprises a main body plugging wall and a containment plugging wall, wherein the main body plugging wall is matched with the opening of the pre-construction tunnel section, the upper part of the main body plugging wall is connected with the top plate of the pre-construction tunnel section, and the lower part of the main body plugging wall is connected with the bottom plate of the pre-construction tunnel section;
the enclosure blocking wall is blocked on the side surface of the main body blocking wall, which is far away from the pre-construction tunnel section;
the waterproof assembly is used for preventing water of the later-stage construction tunnel section from seeping into the earlier-stage construction tunnel section, and comprises a water stopping piece and an impermeable piece which are respectively arranged on two sides of the main body plugging wall, wherein the water stopping piece is plugged on one side, far away from the earlier-stage construction tunnel section, of the enclosure plugging wall; a reserved interface unit for installing the seepage prevention piece is arranged between the main body plugging wall and the pre-construction tunnel section, and the seepage prevention piece is arranged in the reserved interface unit.
2. The temporary plugging structure for the staged construction of the tunnel according to claim 1, wherein the top end of the enclosure plugging wall extends to the ground, and the bottom end of the enclosure plugging wall extends downward and is lower than the tunnel bottom plate.
3. The temporary plugging structure for tunnel staged construction according to claim 1, wherein the reserved interface unit comprises a top plate tongue-and-groove, a side wall tongue-and-groove and a bottom plate tongue-and-groove, wherein,
the top plate rabbet is arranged between the main body blocking wall and the top plate of the pre-construction tunnel section, the side wall rabbet is arranged between the main body blocking wall and the side wall of the pre-construction tunnel section, and the bottom plate rabbet is arranged between the main body blocking wall and the bottom plate of the pre-construction tunnel section.
4. The temporary plugging structure for the staged construction of the tunnel according to claim 3, wherein the seepage-proofing member is a middle-buried steel edge rubber water stop belt, and the middle-buried steel edge rubber water stop belts are respectively arranged in the top plate rabbet, the side wall rabbet and the bottom plate rabbet in a one-to-one correspondence manner.
5. The temporary plugging structure for the staged construction of the tunnel according to claim 1, wherein a reinforcing hidden beam extending transversely along the tunnel is further applied in the top of the pre-construction tunnel section, and the reinforcing hidden beam is arranged at one end, close to the main plugging wall, of the top plate of the pre-construction tunnel section.
6. The temporary plugging structure for staged construction of tunnels according to claim 5, further comprising a cantilever type retaining wall extending transversely along the tunnel, wherein the cantilever type retaining wall is disposed on the top plate of the pre-construction tunnel section, the cantilever type retaining wall comprises a fixed end and a free end, the fixed end is fixedly connected with the reinforcing hidden beam, and the free end extends upwards from the fixed end.
7. The temporary plugging structure for the staged construction of the tunnel according to claim 6, wherein a backfill space for filling backfill is formed between a side of the cantilever type retaining wall far away from the main body plugging wall and the top plate of the pre-construction tunnel section, and a sand filling space for filling sand is formed between a side of the cantilever type retaining wall near the main body plugging wall and the top plate of the pre-construction tunnel section and the main body plugging wall.
8. The temporary plugging structure for the staged construction of the tunnel according to claim 1, wherein the water stop member is a water curtain, and the water curtain is one of a jet grouting pile and a stirring pile.
9. A construction method of a temporary plugging structure for tunnel staged construction, applied to the temporary plugging structure for tunnel staged construction as defined in any one of claims 1-8, characterized by comprising the steps of:
s1, constructing the water stop piece at a first preset distance from the pre-construction tunnel section, wherein the water stop piece extends vertically and is positioned at one end of the post-construction tunnel section; wherein, the water stopping piece is a water curtain;
s2, constructing the enclosure blocking wall;
s3, excavating foundation pits and constructing inner supports for the pre-construction tunnel section successively;
s4, constructing a bottom plate of the pre-construction tunnel section, a side wall close to the bottom and a main body plugging wall structure close to the bottom, and reserving a bottom plate tongue-and-groove and a side wall tongue-and-groove; the bottom plate rabbet is arranged between the main body blocking wall and the bottom plate of the pre-construction tunnel section, and the side wall rabbet is arranged between the main body blocking wall and the side wall of the pre-construction tunnel section;
s5, embedding an anti-seepage piece to the positions of the bottom plate rabbet and the side wall rabbet; wherein the seepage-proofing member is a middle-buried steel edge rubber water stop belt;
s6, sequentially removing the inner support by adopting a forward method, and pouring the side wall above the bottom of the pre-construction tunnel section and the main body plugging wall structure in the middle;
s7, embedding reinforcing hidden beam steel bars and reserving a top plate rabbet; the top plate rabbet is arranged between the main body plugging wall and the top plate of the pre-construction tunnel section;
s8, embedding the embedded steel edge rubber water stop to the positions of the top plate rabbet and the side wall rabbet;
s9, pouring a top plate and a main body plugging wall structure above the middle part.
10. The method for constructing temporary plugging structures for staged construction of tunnels according to claim 9, wherein the step S9 further comprises the steps of:
s10, constructing the cantilever type retaining wall;
s11, fine sand backfilling is carried out on the sand filling space, and manual ramming and soil filling are carried out on the backfilling space.
CN202310304765.3A 2023-03-24 2023-03-24 Temporary plugging structure for tunnel staged construction and construction method thereof Pending CN116517600A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117702931A (en) * 2023-12-29 2024-03-15 中信建筑设计研究总院有限公司 Waterstop protection structure of underground connecting channels and underground connecting channels constructed in phases

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117702931A (en) * 2023-12-29 2024-03-15 中信建筑设计研究总院有限公司 Waterstop protection structure of underground connecting channels and underground connecting channels constructed in phases

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