CN220955627U - External portal ring beam seepage prevention structure of back-covered steel plate of deep-buried shield tunnel - Google Patents
External portal ring beam seepage prevention structure of back-covered steel plate of deep-buried shield tunnel Download PDFInfo
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- CN220955627U CN220955627U CN202322799018.XU CN202322799018U CN220955627U CN 220955627 U CN220955627 U CN 220955627U CN 202322799018 U CN202322799018 U CN 202322799018U CN 220955627 U CN220955627 U CN 220955627U
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 133
- 239000010959 steel Substances 0.000 title claims abstract description 133
- 230000002265 prevention Effects 0.000 title claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 238000003466 welding Methods 0.000 claims description 13
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims 1
- 238000012946 outsourcing Methods 0.000 abstract description 2
- 238000012545 processing Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000009918 complex formation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007569 slipcasting Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
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- Lining And Supports For Tunnels (AREA)
Abstract
The utility model belongs to the field of buildings, and particularly relates to an external portal ring beam seepage prevention structure with a back-covered steel plate for a deep-buried shield tunnel, which comprises a prefabricated back-covered steel plate segment, a foundation pit main body embedded with an L-shaped steel plate and an arc-shaped steel plate for connecting the foundation pit main body with the prefabricated back-covered steel plate segment; the prefabricated back-coated steel plate segments are connected with the L-shaped steel plates through concrete; the prefabricated back-coated steel plate duct piece comprises a duct piece and a back-coated steel plate which is arranged on one side of the duct piece, close to the main body middle plate, and is integrally cast with the duct piece; the arc-shaped steel plates and the foundation pit main body are connected with the hole ring beam; and the prefabricated back-coated steel plate segment extends out of the hole to be connected with the hole ring beam. The utility model takes the principle of removing the duct pieces at the joint as few as possible and disturbing the periphery of the joint as few as possible, and assists the interface processing mode of 'outsourcing ring beams', thereby replacing the traditional mode of arranging 'built-in ring beams' at the vacant position after removing the duct pieces at the joint, and being safer and more reliable.
Description
Technical Field
The utility model belongs to the field of buildings, and particularly relates to an external tunnel portal ring beam seepage prevention structure with a back-covered steel plate for a deep-buried shield tunnel.
Background
With the development of urban rail transit, more projects are constructed by adopting a shield method. The position of shield initiation and reception is also evolving towards deeper and more complex formations.
The traditional method of 'built-in ring beams' adopts the steps of dismantling or chiseling the outermost ring of pipe pieces at the interfaces of the access holes, arranging 'built-in ring beams' to fill the gaps at the interfaces, but under special and complex external conditions, dismantling the pipe pieces at the holes and disturbing surrounding stratum can have certain safety risks, the existing system balance state is easy to be destroyed, and accidents such as water burst, sand burst and the like can be induced into the foundation pit when serious;
The traditional method of adopting the external ring beam adopts the grouting between the arc-shaped steel plate to seal the foundation pit main body and the duct piece to fill, and the arc-shaped steel plate and the duct piece are sealed by the waterproof adhesive tape, so that complete sealing cannot be achieved, and the method is high in safety risk, and if the joint is not well treated, diseases such as water leakage and the like are difficult to radically treat.
Disclosure of utility model
The utility model aims to overcome the defects in the prior art and provides an external portal ring beam seepage prevention structure of a back-covered steel plate of a deep-buried shield tunnel.
The utility model adopts the following technical scheme to realize the aim:
An external portal ring beam seepage prevention structure of a deep buried shield tunnel with a back-covered steel plate comprises a prefabricated back-covered steel plate segment, a foundation pit main body embedded with an L-shaped steel plate and an arc-shaped steel plate for connecting the foundation pit main body and the prefabricated back-covered steel plate segment; the prefabricated back-coated steel plate segments are connected with the L-shaped steel plates through concrete; the prefabricated back-coated steel plate duct piece comprises a duct piece and a back-coated steel plate which is arranged on one side of the duct piece, close to the foundation pit main body, and is opposite to the duct piece; the arc-shaped steel plates and the foundation pit main body are connected with the hole ring beam; and the prefabricated back-coated steel plate segment extends out of the hole to be connected with the hole ring beam.
The prefabricated back-coated steel plate segment extends out of the hole by at least 20cm.
The back-coated steel plate is at least 40cm along the direction of the duct piece.
And water stop bars are arranged at the welding joints of the arc-shaped steel plate and the L-shaped steel plate and the back-coated steel plate.
Grouting guide pipes are pre-buried among the L-shaped steel plate, the arc-shaped steel plate and the back-coated steel plate.
The prefabricated back-coated steel plate duct piece is connected with the hole ring beam through the embedded steel plate; and a water stop strip is arranged at the welding position of the embedded steel plate and the hole ring beam.
The duct piece of the prefabricated back-coated steel plate is provided with prefabricated steel bars; the back-coated steel plate is connected with the duct piece through prefabricated steel bars.
Compared with the prior art, the utility model has the beneficial effects that:
The utility model adopts the duct piece prefabricated back-coated steel plate, and the back-coated steel plate and the duct piece are poured into a whole in the duct piece prefabrication process, so that stable welding spots are provided for the arc-shaped steel plate for plugging, and the structural integrity between the foundation pit main body and the tunnel duct piece and the waterproof reliability of the interface which cannot be solved by the traditional external ring beam are solved. The utility model takes the principle of removing the duct pieces at the joint as few as possible and disturbing the periphery of the joint as few as possible, and assists the interface processing mode of 'outsourcing ring beams', thereby replacing the traditional mode of arranging 'built-in ring beams' at the vacant position after removing the duct pieces at the joint, and being safer and more reliable.
Drawings
FIG. 1 is a schematic diagram of the overall structure of an external portal ring beam seepage prevention structure with a back-coated steel plate for a deep buried shield tunnel;
FIG. 2 is a schematic diagram of a local structure of an external portal ring beam seepage prevention structure with a back-coated steel plate for a deep buried shield tunnel;
FIG. 3 is a schematic view of the structure of a prefabricated back-clad steel plate segment according to the present utility model;
Fig. 4 is a schematic structural view of the construction process of the external portal ring beam seepage prevention structure of the back-coated steel plate of the deep buried shield tunnel, wherein fig. 1 is an enlarged view of a position A in fig. 4.
Detailed Description
The present utility model will be described in further detail below with reference to the drawings and preferred embodiments, so that those skilled in the art can better understand the technical solutions of the present utility model.
FIGS. 1-4 show an external portal ring beam seepage prevention structure (FIG. 1 is an enlarged view of A in FIG. 4) of a deeply buried shield tunnel with a back-covered steel plate, comprising a prefabricated back-covered steel plate segment, a foundation pit main body 01 embedded with an L-shaped steel plate 06 and an arc-shaped steel plate 07 connecting the foundation pit main body and the prefabricated back-covered steel plate segment; the prefabricated back-coated steel plate segments are connected with the L-shaped steel plates through concrete 04; the prefabricated back-coated steel plate duct piece comprises a duct piece 02 and a back-coated steel plate 05 arranged on one side of the duct piece, which is close to the main body middle plate; fig. 3 shows that the segments of the prefabricated back-clad steel plates are provided with prefabricated reinforcing bars 17; the back-coated steel plate is connected with the duct piece 02 through prefabricated steel bars 17. A welding rib 16 is arranged between the prefabricated steel bar 17 and the back-coated steel plate 05; the arc-shaped steel plates 07 and the foundation pit main body 01 are connected with the hole ring beam 03; and the prefabricated back-coated steel plate segment extends out of the hole to be connected with the hole ring beam. The prefabricated back-coated steel plate segment extends out of the hole by at least 20cm. The back-coated steel plate is at least 40cm along the direction of the duct piece.
The welding seam of the arc-shaped steel plate 07 and the L-shaped steel plate 06 and the back-coated steel plate 05 is provided with a water stop strip 08. Grouting guide pipes 10 are pre-buried among the L-shaped steel plate 06, the arc-shaped steel plate 07 and the back-coated steel plate 05.
The prefabricated back-coated steel plate duct piece is connected with the hole ring beam 03 through the embedded steel plate 09; the water stop strip 08 is arranged at the welding position of the embedded steel plate 09 and the hole ring beam 03.
Fig. 4 shows a structural schematic diagram of an external portal ring beam seepage prevention structure construction process of a back-covered steel plate of a deep-buried shield tunnel, which comprises an end well 18, a main board middle plate 20, a main board bottom plate 15 and a main board middle plate, wherein the main board middle plate is connected with a portal ring beam 03 through a structural beam 19.
The implementation process of the external portal ring beam seepage prevention structure with the back-covered steel plate for the deep-buried shield tunnel comprises the following steps:
(1) Manufacturing a prefabricated back-coated steel plate segment: the back-coated steel plate shown in fig. 3 is designed, the length of the back-coated steel plate along the duct piece direction is 40cm, the economical efficiency is guaranteed, the structural integrity and the waterproof reliability of the interface are guaranteed, the designed back-coated steel plate 05 is welded through the prefabricated steel bars 17 on the duct piece 02 through the welding ribs 16, and the back-coated steel plate is cast integrally.
(2) Planning the length of an exposed prefabricated back-cladding steel plate segment (hereinafter referred to as prefabricated segment): for shield starting, the 0-ring prefabricated pipe piece is exposed out of the portal by at least 20cm, so that the lap joint length of the external portal ring beam is ensured; for shield receiving, the conventional row of segments cannot accurately meet the requirement of the exposed length of the last ring of prefabricated segments, so that segment planning is performed in advance by ten rings, and the exposed length of the last ring of prefabricated segments is about 20cm through mixed laying of segments with different lengths, such as segments with lengths of 1.5m and 1.2 m.
(3) Checking water seepage of the hole ring: before the water stop curtain cloth is removed, the water seepage condition of the prefabricated pipe piece must be checked. And opening the prefabricated pipe piece at the opening to check, and dismantling after confirming that the prefabricated pipe piece is no longer water-permeable and the slurry is solidified. Removing the waterproof curtain cloth for water prevention after no water seepage, cleaning the hole, and removing rust from the L-shaped steel plate pre-embedded in the foundation pit main body and the back-coated steel plate of the prefabricated pipe piece by using a rust remover;
(4) Welding arc steel plate 07, welding arc steel plate 07 and pre-buried L shaped steel plate 06, arc steel plate 07 and back cover steel plate 05 to reserve grouting hole and slip casting pipe 10 at arc steel plate 07, and set up sealing strip 08 in the welding seam department, thereby guarantee structure waterproof performance.
(5) By reserving the grouting guide pipe 10, grouting fills the gaps among the arc-shaped steel plate 07, the back-coated steel plate 05 and the L-shaped steel plate 06.
(6) And finally determining the length of the portal ring beam according to the size of the site portal and the size and position of the ring segment and the requirements of the design drawing. Note that the steel bar 11 of the portal ring beam should be welded with the arc-shaped steel plate 07 and the embedded steel plate 09 of the duct piece, so that the structural integrity is ensured, and the water expansion sealing strip 08 is arranged at the welding position of the steel bar 11 of the portal ring beam and the embedded steel plate 09 of the duct piece, so that the tightness is ensured.
(7) Formwork supporting, pouring and curing: and (3) supporting the mould and pouring the portal ring beam body and a bearing base at the lower part of the portal ring beam body to form a final stable external ring beam structure type and a stress system.
The foregoing is merely exemplary of the present utility model, and those skilled in the art should not be considered as limiting the utility model, since modifications may be made in the specific embodiments and application scope of the utility model in light of the teachings of the present utility model.
Claims (7)
1. The anti-seepage structure of the external portal ring beam of the back-covered steel plate of the deep buried shield tunnel is characterized by comprising a prefabricated back-covered steel plate segment, a foundation pit main body embedded with an L-shaped steel plate and an arc-shaped steel plate for connecting the foundation pit main body and the prefabricated back-covered steel plate segment; the prefabricated back-coated steel plate segments are connected with the L-shaped steel plates through concrete; the prefabricated back-coated steel plate duct piece comprises a duct piece and a back-coated steel plate which is arranged on one side of the duct piece, close to the foundation pit main body, and is opposite to the duct piece; the arc-shaped steel plates and the foundation pit main body are connected with the hole ring beam; and the prefabricated back-coated steel plate segment extends out of the hole to be connected with the hole ring beam.
2. The external portal ring beam seepage prevention structure of the back-covered steel plate of the deep-buried shield tunnel according to claim 1, wherein the distance that the prefabricated back-covered steel plate segments extend out of the portal is at least 20cm.
3. The impermeable structure of an external portal ring beam with a back-coated steel plate for a deep-buried shield tunnel according to claim 1, wherein the back-coated steel plate is at least 40cm along the segment direction.
4. The anti-seepage structure of the external portal ring beam of the back-covered steel plate of the deep-buried shield tunnel belt, which is disclosed in claim 1, is characterized in that water stop bars are arranged at the welding seams of the arc-shaped steel plate, the L-shaped steel plate and the back-covered steel plate.
5. The anti-seepage structure of the external portal ring beam of the back-covered steel plate of the deep-buried shield tunnel belt, which is characterized in that grouting guide pipes are pre-buried among the L-shaped steel plate, the arc-shaped steel plate and the back-covered steel plate.
6. The anti-seepage structure of the external portal ring beam of the back-covered steel plate of the deep-buried shield tunnel according to claim 1, wherein the prefabricated back-covered steel plate segments are connected with the portal ring beam through the embedded steel plate; and a water stop strip is arranged at the welding position of the embedded steel plate and the hole ring beam.
7. The anti-seepage structure of the external portal ring beam of the back-covered steel plate of the deep-buried shield tunnel according to claim 1, wherein the segments of the prefabricated back-covered steel plate are provided with prefabricated reinforcing steel bars; the back-coated steel plate is connected with the duct piece through prefabricated steel bars.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322799018.XU CN220955627U (en) | 2023-10-16 | 2023-10-16 | External portal ring beam seepage prevention structure of back-covered steel plate of deep-buried shield tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322799018.XU CN220955627U (en) | 2023-10-16 | 2023-10-16 | External portal ring beam seepage prevention structure of back-covered steel plate of deep-buried shield tunnel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220955627U true CN220955627U (en) | 2024-05-14 |
Family
ID=91015458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322799018.XU Active CN220955627U (en) | 2023-10-16 | 2023-10-16 | External portal ring beam seepage prevention structure of back-covered steel plate of deep-buried shield tunnel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220955627U (en) |
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2023
- 2023-10-16 CN CN202322799018.XU patent/CN220955627U/en active Active
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