CN108756937B - Shield tunnel lining structure and method with ultra-long service life in strong corrosion environment - Google Patents
Shield tunnel lining structure and method with ultra-long service life in strong corrosion environment Download PDFInfo
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- CN108756937B CN108756937B CN201810766143.1A CN201810766143A CN108756937B CN 108756937 B CN108756937 B CN 108756937B CN 201810766143 A CN201810766143 A CN 201810766143A CN 108756937 B CN108756937 B CN 108756937B
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- 238000005260 corrosion Methods 0.000 title claims abstract description 44
- 230000007797 corrosion Effects 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 9
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 84
- 230000007774 longterm Effects 0.000 claims abstract description 27
- 229910000831 Steel Inorganic materials 0.000 claims description 108
- 239000010959 steel Substances 0.000 claims description 108
- 239000010410 layer Substances 0.000 claims description 54
- 239000004567 concrete Substances 0.000 claims description 17
- 239000000565 sealant Substances 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 239000011241 protective layer Substances 0.000 claims description 3
- 238000004901 spalling Methods 0.000 claims description 3
- 239000003566 sealing material Substances 0.000 claims description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 abstract description 48
- 230000002035 prolonged effect Effects 0.000 abstract description 7
- 238000011065 in-situ storage Methods 0.000 abstract description 4
- 230000003014 reinforcing effect Effects 0.000 description 11
- 239000002356 single layer Substances 0.000 description 9
- 238000010276 construction Methods 0.000 description 8
- 238000005266 casting Methods 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 6
- 238000000576 coating method Methods 0.000 description 6
- 230000002787 reinforcement Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000004078 waterproofing Methods 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 3
- 239000013535 sea water Substances 0.000 description 3
- 239000002689 soil Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229920006334 epoxy coating Polymers 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
Classifications
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- 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
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
-
- 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
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
- E21D11/086—Methods of making concrete lining segments
-
- 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
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
-
- 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
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/107—Reinforcing elements therefor; Holders for the reinforcing elements
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- 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
- E21D11/385—Sealing means positioned between adjacent lining members
- E21D11/386—Sealing means positioned between adjacent lining members inflatable sealing means
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- 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)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a shield tunnel lining structure with an ultra-long service life in a strong corrosion environment, which comprises a prefabricated reinforced concrete lining segment (1) and a reinforced concrete secondary lining (2), wherein the prefabricated reinforced concrete lining segment (1) comprises an outer side reinforcing steel bar (3), a prefabricated segment middle layer reinforcing steel bar (4) and a prefabricated segment inner side reinforcing steel bar (5) in the prefabricated segment from outside to inside, and the reinforced concrete secondary lining (2) comprises a secondary lining stressed reinforcing steel bar (6). The invention also discloses a shield tunnel lining method suitable for the strong corrosion environment. According to the shield tunnel lining structure with the ultra-long service life under the strong corrosion environment, when the inner side and the outer side of the pipe piece are corroded and fail, the unetched part of the inner part of the existing pipe piece is fully utilized in a long term, and reinforced concrete is poured on the inner side to form a superposed structure of the outer side reinforced concrete pipe piece and the inner side cast-in-situ lining, so that the service life of the tunnel lining structure is prolonged.
Description
Technical Field
The invention belongs to the technical field of tunnel engineering, and particularly relates to a shield tunnel lining structure and method with an ultra-long service life in a strong corrosion environment.
Background
At present, two types of shield tunnel lining structures exist, one is a single-layer prefabricated segment lining structure, and the other is a double-layer lining structure formed by prefabricated lining segments and internal cast-in-place concrete lining structures. The prefabricated lining segments are generally made of reinforced concrete materials, and under the strong corrosion environment such as seawater, chloride ions permeate to the surfaces of the steel bars, and after the concentration of the chloride ions reaches a critical value, passivation films on the surfaces of the steel bars can be broken down to cause corrosion of the steel bars, so that the bearing capacity of the structure is reduced until the structure is lost. In order to ensure the design service life of the lining structure, the submarine tunnel constructed by adopting the shield tunnel method generally adopts measures of increasing the thickness of the outer reinforcement protection layer, coating the outer side of the segment with an anti-corrosion coating, coating the surface of the reinforcement with an epoxy coating and the like to improve the durability.
The existing single-layer lining structure causes stripping of a concrete protection layer after corrosion of reinforcing steel bars at the inner side and the outer side in a corrosion environment, the corrosion of the reinforcing steel bars is aggravated, and when the corrosion of the reinforcing steel bars reaches a certain degree, the lining structure fails, and the service life of the tunnel structure is prolonged. Because the corrosion of the steel bars in the concrete is unavoidable in the seawater environment, the service life of the single-layer concrete segment is shorter. Even if the outside of the pipe piece is coated with the anti-corrosion coating or the surface of the steel bar is coated with the anti-corrosion coating, the service life can only be prolonged by 15-20 years according to the current technical level. The service life of the submarine tunnel constructed by adopting the single-layer lining segment at present is generally 100 years.
The double-layer lining scheme can be variously implemented according to the different actions and implementation time of the secondary lining, one is that the secondary lining adopts plain concrete and is implemented in the initial stage of tunnel construction, and the secondary lining is not used as a main stress member of a tunnel lining structure and is only used as a protection structure for preventing fire, collision and corrosion of inner side reinforcing steel bars. When the steel bars outside the segments are corroded, the bearing capacity of the lining structure is reduced until the lining structure is lost, so that the service life of the lining structure is the same as that of a single-layer lining, and is generally 100 years. The space for pouring the secondary lining in the later period is reserved at the inner side of the existing tunnel, namely, after the corrosion failure of the reinforcing steel bars at the outer side of the original duct piece, a lining structure is poured at the inner side of the tunnel again, and the lining of the duct piece at the outer side is not utilized. The scheme has clear thought, but does not utilize the non-corroded part in the original segment structure, all external loads and waterproofing depend on secondary lining, the secondary lining thickness required to be poured in a long term is larger, namely, larger secondary lining space is required to be reserved in the clearance of the tunnel, so that the diameter of the shield tunnel segment constructed in advance is increased more, the lining thickness required to be poured in a later period and the consumption of steel bars are increased, and the initial investment and the long-term investment are increased more.
According to the current research results, after the measures are adopted, the lining segments can meet the aim that the service life is not less than 100 years. However, whether the surface of the segment is used as an anti-corrosion coating or an epoxy reinforcing steel bar is adopted, the service life of the segment can be prolonged by 15-20 years generally; in addition, the waterproof sealing gasket of the shield tunnel segment joint is generally arranged on the outer side, and along with corrosion of reinforcing steel bars near the sealing gasket groove on the outer side of the segment, concrete near the sealing gasket groove can peel off, so that waterproof failure is caused. For some significant submarine tunnel projects, other measures are required to achieve a service life of 150 years or even longer.
Disclosure of Invention
In order to meet the above defect or improvement demand of the prior art, the invention provides a shield tunnel lining structure and a shield tunnel lining method with an ultra-long service life under a strong corrosion environment, wherein in a prefabricated reinforced concrete lining segment, outer side reinforcing steel bars and inner side reinforcing steel bars of the prefabricated segment are stress reinforcing steel bars for bearing recent loads, after the outer side stress reinforcing steel bars are corroded, a long-time poured reinforced concrete secondary lining containing secondary lining stress reinforcing steel bars is paved on the inner side of the prefabricated reinforced concrete lining segment, and a pre-buried radial tie bar connector penetrates through the inner side reinforcing steel bars of the prefabricated segment to enable the prefabricated segment middle layer reinforcing steel bars and the secondary lining stress reinforcing steel bars to be in a drawknot mode, so that a novel lining structure with the prefabricated segment middle layer reinforcing steel bars being the outer side stress reinforcing steel bars and the secondary lining stress reinforcing steel bars being the inner side stress reinforcing steel bars is formed, and the novel lining structure is used for bearing tunnel external loads. The structure fully utilizes the non-corroded part inside the existing duct piece, and forms the technical scheme of the superposed structure of the outside reinforced concrete duct piece and the inside cast-in-situ lining by pouring reinforced concrete inside, so that the service life of the tunnel lining structure is greatly prolonged.
In order to achieve the above object, according to one aspect of the present invention, there is provided a shield tunnel lining structure having an ultra-long service life in a strongly corrosive environment, characterized by comprising a prefabricated reinforced concrete lining segment and a reinforced concrete secondary lining; wherein,
The prefabricated reinforced concrete lining pipe piece comprises three layers of steel bars, wherein the three layers of steel bars are respectively an outer steel bar, a middle layer steel bar and an inner steel bar from outside to inside in the prefabricated pipe piece, the outer steel bar and the inner steel bar are stress steel bars for bearing recent loads, and the middle layer steel bar of the prefabricated pipe piece does not participate in structural stress;
The reinforced concrete secondary lining comprises a secondary lining stressed steel bar, the prefabricated reinforced concrete lining pipe piece further comprises a pre-buried radial tie bar connector, the pre-buried radial tie bar connector is used for enabling the prefabricated pipe piece middle layer steel bar and the secondary lining stressed steel bar to be tied, and the prefabricated pipe piece middle layer steel bar and the secondary lining stressed steel bar which are not corroded in the prefabricated reinforced concrete lining pipe piece are used as a new superposed lining structure for bearing external loads of a tunnel.
Further, the prefabricated segment middle layer steel bars comprise main circumferential stress steel bars, longitudinal distribution steel bars and radial tie steel bars, and the radial tie steel bars are arranged at equal intervals and used for connecting the prefabricated segment middle layer steel bars with the prefabricated segment inner side steel bars.
Further, the inner side of the radial tie bar is connected with the end part of the steel bar on the inner side of the prefabricated segment and the embedded radial tie bar connector which is connected with the secondary lining stressed steel bar in a long term is reserved.
Further, the end head of the embedded radial tie bar connector is not exposed and keeps a certain distance with the inner surface of the prefabricated reinforced concrete lining segment.
Further, the annular structures formed by connecting the prefabricated reinforced concrete lining segments with the same size are used as the outer layers of the shield tunnel.
Further, the joints between the prefabricated reinforced concrete lining segments comprise outer waterproof grooves and outer standby waterproof grooves.
Further, the thickness of the reinforced concrete secondary lining is smaller than that of the prefabricated reinforced concrete lining segment.
Further, the reinforced concrete secondary lining is of a continuous annular integrated structure.
According to another aspect of the invention, a shield tunnel lining method with an ultra-long service life in a strong corrosion environment is provided, and the shield tunnel lining structure with the ultra-long service life in the strong corrosion environment is applied to the shield tunnel lining structure, which specifically comprises the following steps:
s1: firstly constructing the prefabricated reinforced concrete lining segment, configuring three layers of stressed steel bars, arranging outer steel bars in the prefabricated segment, middle layer steel bars of the prefabricated segment and inner steel bars of the prefabricated segment from outside to inside, and reserving the embedded radial tie bar connector for tie between the middle layer steel bars of the prefabricated segment and the stressed steel bars of the secondary lining;
S2: two waterproof grooves are formed on the outer side of the prefabricated reinforced concrete lining segment joint, namely the outer side waterproof groove and the outer side standby waterproof groove, and the outer side standby waterproof groove is not used recently and is used as a long-term waterproof standby groove;
S3: when secondary lining is poured for a long time, chiseling off the corroded spalling concrete protective layer on the inner side of the prefabricated reinforced concrete lining segment, and pulling the non-corroded part of the prefabricated reinforced concrete lining segment through the embedded radial tie bar connector, namely, the middle layer steel bars of the prefabricated segment, the inner side steel bars of the prefabricated segment and the post-pouring secondary lining stressed steel bars to form an integral stressed structure;
s4: and injecting water-swelling sealant into the outer standby waterproof groove, and then pouring secondary lining concrete outside the reinforcing steel bars of the middle layer of the prefabricated segment.
In general, the above technical solutions conceived by the present invention, compared with the prior art, enable the following beneficial effects to be obtained:
(1) In the shield tunnel lining structure with the ultra-long service life under the strong corrosion environment, in the prefabricated reinforced concrete lining segment, the outer side reinforcing steel bars in the prefabricated segment and the inner side reinforcing steel bars in the prefabricated segment are stress reinforcing steel bars for bearing the near load, after the outer side stress reinforcing steel bars are rusted, the reinforced concrete secondary lining which is paved on the inner side of the prefabricated reinforced concrete lining segment and contains the secondary lining stress reinforcing steel bars and is cast for a long time is laid, and the embedded radial tie bar connector penetrates through the inner side reinforcing steel bars of the prefabricated segment to enable the prefabricated segment middle layer reinforcing steel bars and the secondary lining stress reinforcing steel bars to be in a drawknot mode, so that a novel lining structure with the prefabricated segment middle layer reinforcing steel bars being the outer side stress reinforcing steel bars and the secondary lining stress reinforcing steel bars being the inner side stress reinforcing steel bars is formed, and the shield tunnel lining structure is used for bearing the external load. After rust failure occurs to the reinforcing steel bars at the inner side and the outer side of the pipe piece in a long term, the non-corroded part of the inner side of the existing pipe piece is fully utilized, and the technical scheme of the superposed structure of the cast-in-situ lining of the outer side reinforced concrete pipe piece and the inner side is formed by pouring reinforced concrete at the inner side, so that the service life of the tunnel lining structure is greatly prolonged.
(2) The shield tunnel lining structure with the ultra-long service life in the strong corrosion environment comprises a circular stress main reinforcement, longitudinal distribution reinforcement and radial tie reinforcement. Wherein, equidistant radial tie bars connect prefabricated section of jurisdiction intermediate level reinforcing bar and prefabricated section of jurisdiction inboard reinforcing bar, and radial tie bars inboard is connected prefabricated section of jurisdiction inboard reinforcing bar's end position reservation long-term and secondary lining reinforcing bar connection's pre-buried radial tie bar connector forms new lining structure, extension lining structure life.
(3) According to the shield tunnel lining structure with the ultra-long service life under the strong corrosion environment, from the structural stress perspective, the required thickness of the long-term poured reinforced concrete secondary lining is thinner, and if the long-term poured reinforced concrete secondary lining is relied on for waterproofing, the thickness of the long-term poured reinforced concrete secondary lining is increased, so that the scheme of waterproofing a segment joint is still adopted. Injecting water-swelling sealant into the outside standby waterproof groove, and then pouring secondary lining concrete outside the reinforcing steel bars of the middle layer of the prefabricated segment.
(4) The shield tunnel lining structure with the ultra-long service life in the strong corrosion environment does not need to re-construct the secondary lining to bear all loads, the diameter of the shield tunnel segment constructed firstly does not need to be increased too much, the thickness of the lining poured at the later stage and the consumption of steel bars are reduced, and the initial investment and the long-term engineering investment are reduced. Compared with the prior art, the lining structure in the prior art can maintain the service life at most, and the lining structure can theoretically realize the superposition of the service life and can be used for at most years.
(5) The shield tunnel lining method suitable for the ultra-long service life in the strong corrosion environment comprises the steps of pre-constructing a prefabricated reinforced concrete lining segment, chiseling off a corroded spalling concrete protection layer on the inner side of the segment during long-term casting of a secondary lining, forming an integral stress structure by pre-embedding radial tie bar connectors on inner side reinforcing bars of a prefabricated segment in the pre-constructed prefabricated reinforced concrete lining segment and post-casting secondary lining stress reinforcing bars, wherein the thickness of the long-term casting secondary lining reinforced concrete is thinner, and a single-layer reinforcing bar is adopted, so that the non-corroded segment structure and the post-casting secondary lining form a new lining structure to bear external water and soil load through the pre-embedded connectors, and the purpose of prolonging the service life of the lining structure is realized
Drawings
FIG. 1 is a general diagram of a shield tunnel lining structure with an ultra-long service life in a strong corrosion environment according to an embodiment of the invention;
FIG. 2 is a diagram of a prefabricated lining segment structure for pre-construction of a shield tunnel lining structure with an ultra-long service life in a strong corrosion environment according to an embodiment of the invention;
Fig. 3 is a construction diagram of a tunnel lining after long-term casting secondary lining of a shield tunnel lining structure with an ultra-long service life under a strong corrosion environment in an embodiment of the invention.
Like reference numerals denote like technical features throughout the drawings, in particular: 1-prefabricated reinforced concrete lining segment, 2-long-term pouring reinforced concrete secondary lining, 3-outer side stress steel bars in the prefabricated segment, 4-middle layer stress steel bars of the prefabricated segment, 5-inner side stress steel bars of the prefabricated segment, 6-secondary lining stress steel bars, 7-embedded radial tie bar connector, 8-outer side waterproof grooves and 9-outer side standby waterproof grooves.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. 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. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Fig. 1 is a shield tunnel lining structure with an ultra-long service life in a strong corrosion environment, which comprises a prefabricated reinforced concrete lining segment 1 and a reinforced concrete secondary lining 2 which is poured in a long term, wherein the shield tunnel lining structure is of an annular structure, the outer layer is formed by connecting a plurality of prefabricated reinforced concrete lining segments 1 with the same size, and compared with the prefabricated reinforced concrete lining segment 1, the reinforced concrete secondary lining 2 which is poured in a long term on the inner side is thinner and is of a continuous annular integrated structure. The service life of the lining structure proposal provided by the invention is far longer than that of a single-layer lining structure or a double-layer lining structure of an outer reinforced concrete segment and an inner plain concrete; from the engineering investment, the non-rusted part in the reinforced concrete pipe sheet on the outer side is fully utilized for a long time, so that the thickness required by the secondary lining is reduced, the reinforcement can be arranged in a single layer, the outer diameter of a tunnel can be correspondingly reduced, and the total engineering investment is reduced.
Fig. 2 is a block diagram of a prefabricated lining segment of the shield tunnel lining structure with an ultra-long service life under a strong corrosion environment, and as shown in fig. 2, a prefabricated reinforced concrete lining segment 1 of the prefabricated segment comprises an outer steel bar 3, a middle layer steel bar 4, an inner steel bar 5, an embedded radial tie bar connector 7, an outer waterproof groove 8 and an outer standby waterproof groove 9. Unlike common reinforced concrete pipe piece, the prefabricated reinforced concrete lining pipe piece 1 of the first construction is provided with three layers of reinforcing steel bars, namely an outer reinforcing steel bar 3, a prefabricated pipe piece middle layer reinforcing steel bar 4 and a prefabricated pipe piece inner reinforcing steel bar 5 in the prefabricated pipe piece from outside to inside, wherein the outer reinforcing steel bar 3 and the prefabricated pipe piece middle layer reinforcing steel bar 4 in the prefabricated pipe piece are closer in distance, and before the secondary lining construction, the outer reinforcing steel bar 3 and the prefabricated pipe piece inner reinforcing steel bar 5 in the prefabricated pipe piece are stressed reinforcing steel bars for bearing the recent load, and the prefabricated pipe piece middle layer reinforcing steel bar 4 is close to a central shaft at the moment and basically does not participate in structural stress. The clearance between the outer steel bars 3 in the prefabricated segment and the middle steel bars 4 in the prefabricated segment in the three-layer steel bars meets the requirement of a concrete protection layer. The prefabricated segment middle layer steel bars 4 comprise annular stress main bars, longitudinally distributed steel bars and radial tie bars. Wherein, equidistant radial tie bars connect prefabricated section of jurisdiction intermediate level reinforcing bar 4 and prefabricated section of jurisdiction inboard reinforcing bar 5, and radial tie bars inboard is connected prefabricated section of jurisdiction inboard reinforcing bar 5's end position reservation long-term and secondary lining reinforcing bar connection's pre-buried radial tie bar connector 7, in order to prevent the connector corrosion, connector end does not expose to keep certain distance with the prefabricated reinforced concrete lining segment 1 internal surface of construction earlier. The joint between the prefabricated reinforced concrete lining segments 1 comprises two grooves, namely an outer waterproof groove 8 and an outer standby waterproof groove 9, wherein the outer waterproof groove 8 is a recent waterproof gasket groove, and a waterproof elastic gasket is required to be installed before the prefabricated reinforced concrete lining segments 1 are assembled; the outside spare waterproof groove 9 is a sealing groove reserved for the long-term lining structure in a waterproof mode, at the moment, the outside spare waterproof groove 9 is empty, and before long-term secondary lining pouring, water-swelling waterproof sealing materials are injected.
Fig. 3 is a construction diagram of a tunnel lining after long-term casting secondary lining of a shield tunnel lining structure with an ultra-long service life under a strong corrosion environment in an embodiment of the invention. As shown in fig. 3, when the prefabricated reinforced concrete lining segment 1 is rusted by outside seawater (or other harmful substances) and salt mist in a tunnel to make the outside steel bars 3 in the prefabricated segment, a reinforced concrete secondary lining 2 with a secondary lining stress steel bar 6 is laid on the inside of the prefabricated reinforced concrete lining segment 1 in time, and a pre-buried radial tie bar connector 7 penetrates through the steel bars 5 on the inside of the prefabricated segment to enable the steel bars 4 and the secondary lining stress steel bar 6 of the prefabricated segment to realize tie, so that a new lining structure with the steel bars 4 on the middle layer of the prefabricated segment being the outside stress steel bars and the steel bars 6 on the secondary lining being the inside stress steel bars is formed, and the prefabricated segment is used for bearing the external load of the tunnel, and the steel bars 5 on the inside of the prefabricated segment are near a central shaft and basically not involved in structural stress. The secondary lining reinforced concrete poured in a long time is thinner in thickness and adopts a single-layer steel bar, and a non-corroded duct piece structure and a secondary lining poured later form a new lining structure to bear external water and soil load through a pre-buried connector, so that the purpose of prolonging the service life of the lining structure is realized. Because the required thickness of the reinforced concrete secondary lining 2 which is poured in a long time is thinner from the structural stress perspective, if the reinforced concrete secondary lining 2 which is poured in a long time is relied on for waterproofing, the thickness of the reinforced concrete secondary lining 2 needs to be increased, so that the scheme of waterproofing the segment joints is still adopted. The outside spare waterproof groove 9 is filled with water-swelling sealant, and then secondary lining concrete is poured outside the prefabricated segment middle layer steel bar 4. According to the corrosion principle (penetration depth and concentration of chloride ions or other harmful substances are increased along with the time) of the reinforced concrete lining segment in the corrosion environment, the technical scheme is provided, when corrosion failure occurs to the inner side and the outer side of the segment in a long-term manner in the strong corrosion environment, the non-corrosion part in the existing segment is fully utilized, reinforced concrete is poured on the inner side, and the superposed structure of the outer reinforced concrete segment and the inner side cast-in-situ lining is formed, so that the service life of the tunnel lining structure is greatly prolonged.
A shield tunnel lining structure with ultra-long service life in a strong corrosion environment is realized by the following steps:
S1: the prefabricated reinforced concrete lining segment 1 is constructed in advance and is provided with three layers of stressed steel bars, namely an outer steel bar 3, a middle layer steel bar 4 and an inner steel bar 5 in the prefabricated segment from outside to inside. And a pre-buried radial tie bar connector 7 for tie between the prefabricated segment middle layer steel bar 4 and the secondary lining stressed steel bar 6 is reserved.
S2: two waterproof grooves, namely an outer waterproof groove 8 and an outer standby waterproof groove 9, are arranged near the outer side of the seam of the pre-construction precast reinforced concrete lining segment 1, and the outer standby waterproof groove 9 is not used recently and is used as a long-term waterproof standby groove.
S3: when the secondary lining is poured in a long term, the corroded stripping mixed concrete protective layer on the inner side of the prefabricated reinforced concrete lining segment 1 is required to be chiseled, and the non-corroded part in the prefabricated reinforced concrete lining segment 1, namely the prefabricated segment middle layer steel bar 4 and the prefabricated segment inner side steel bar 5 are tied with the post-pouring secondary lining stressed steel bar 6 through the pre-buried radial tie bar connector 7 to form an integral stressed structure.
S4: and injecting water-swelling sealant into the outside standby waterproof groove 9, and then pouring secondary lining concrete outside the prefabricated segment middle layer steel bars 4.
According to the lining structure and the waterproof scheme, the service life of the tunnel lining structure is the sum of the service life of the prefabricated lining segments and the service life of the secondary lining, and the service life of the tunnel structure can theoretically reach 200 years under the assumption that the service life of the prefabricated lining segments and the service life of the secondary lining are 100 years.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (2)
1. The shield tunnel lining structure with the ultra-long service life in the strong corrosion environment is characterized by comprising a prefabricated reinforced concrete lining segment (1) and a reinforced concrete secondary lining (2), wherein the reinforced concrete secondary lining (2) comprises secondary lining stress steel bars (6); wherein,
A plurality of ring-shaped structures formed by connecting the prefabricated reinforced concrete lining segments (1) with the same size are used as the outer layers of the shield tunnel;
The thickness of the reinforced concrete secondary lining (2) is smaller than that of the prefabricated reinforced concrete lining segment (1), and the reinforced concrete secondary lining (2) is of a continuous annular integrated structure;
The joint between the prefabricated reinforced concrete lining segments (1) comprises an outer waterproof groove (8) and an outer standby waterproof groove (9), wherein the outer waterproof groove (8) is provided with a waterproof elastic sealing gasket before the prefabricated reinforced concrete lining segments (1) are assembled, and the outer standby waterproof groove (9) is filled with a water-swelling waterproof sealing material before long-term secondary lining pouring;
The prefabricated reinforced concrete lining segment (1) comprises three layers of steel bars and an embedded radial tie bar connector (7), wherein the three layers of steel bars are respectively an outer steel bar (3) in the prefabricated segment, an intermediate steel bar (4) in the prefabricated segment and an inner steel bar (5) in the prefabricated segment from outside to inside, the outer steel bar (3) in the prefabricated segment and the inner steel bar (5) in the prefabricated segment are stressed steel bars for bearing recent loads, and the intermediate steel bar (4) in the prefabricated segment does not participate in structural stress;
the prefabricated segment middle layer steel bars (4) comprise main circumferential stress steel bars, longitudinal distributed steel bars and radial tie steel bars, and the radial tie steel bars are arranged at equal intervals and are used for connecting the prefabricated segment middle layer steel bars (4) with the prefabricated segment inner side steel bars (5);
The inner side of the radial tie bar is connected with the end part of the prefabricated segment inner side steel bar (5), and the embedded radial tie bar connector (7) which is connected with the secondary lining stress steel bar (6) in a long term is reserved; the end of the embedded radial tie bar connector (7) is not exposed and keeps a certain distance with the inner surface of the precast reinforced concrete lining segment (1); the secondary lining stressed steel bar (6) is connected with the embedded radial tie bar connector (7) and is used for tie the prefabricated segment middle layer steel bar (4) and the secondary lining stressed steel bar (6), and the prefabricated segment middle layer steel bar (4) and the secondary lining stressed steel bar (6) which are not corroded in the prefabricated reinforced concrete lining segment (1) are used as a new superposed lining structure for bearing the external load of the tunnel.
2. The shield tunnel lining method with the ultra-long service life under the strong corrosion environment is characterized by being realized by applying the shield tunnel lining structure with the ultra-long service life under the strong corrosion environment as claimed in claim 1, and specifically comprises the following steps of
S1: firstly constructing the prefabricated reinforced concrete lining segment (1), configuring three layers of stressed steel bars, arranging an outer steel bar (3), an intermediate layer steel bar (4) and an inner steel bar (5) of the prefabricated segment in the prefabricated segment from outside to inside, and reserving the embedded radial tie bar connector (7) for tie between the intermediate layer steel bar (4) of the prefabricated segment and the stressed steel bar (6) of the secondary lining;
S2: two waterproof grooves are formed on the outer side of the joint of the prefabricated reinforced concrete lining segment (1), namely the outer waterproof groove (8) and the outer standby waterproof groove (9), and the outer standby waterproof groove (9) is not used recently and is used as a long-term waterproof standby groove;
S3: when secondary lining is poured in a long-term manner, chiseling off the corroded spalling concrete protective layer on the inner side of the prefabricated reinforced concrete lining segment (1), and pulling out the non-corroded part in the prefabricated reinforced concrete lining segment (1), namely the prefabricated segment middle layer steel bar (4) and the prefabricated segment inner side steel bar (5), and the secondary lining stressed steel bar (6) poured later to form an integral stressed structure through the embedded radial pulling-up bar connector (7);
s4: and injecting water-swelling sealant into the outer standby waterproof groove (9), and then pouring secondary lining concrete outside the prefabricated segment middle layer steel bars (4).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| AT522094B1 (en) * | 2019-02-04 | 2024-04-15 | Univ Wien Tech | REINFORCED CONCRETE TUBBING |
| CN110397447A (en) * | 2019-06-27 | 2019-11-01 | 广东省水利水电科学研究院 | The construction method of Shield tunnel armored concrete liner composite lining structural shape |
| CN110397450B (en) * | 2019-07-26 | 2024-07-05 | 浙江交工集团股份有限公司 | Assembled connection method for tunnel concrete lining structure steel bars |
| CN111456757B (en) * | 2020-04-30 | 2021-07-13 | 中铁隧道集团二处有限公司 | Construction method for preventing large-section tunnel lining reinforcing steel bars from collapsing |
| CN112796784B (en) * | 2021-01-21 | 2022-02-22 | 北京城建设计发展集团股份有限公司 | Assembled integral shield tunnel structure and construction method thereof |
| CN113550765B (en) * | 2021-07-29 | 2023-12-12 | 中铁隧道集团一处有限公司 | Construction method for preventing high cantilever tunnel side wall lining reinforcement cage from inward tilting by using section steel |
| CN116044442B (en) * | 2023-03-31 | 2023-06-02 | 中建交通建设集团有限公司 | Butt joint section structure in shield ground and construction method thereof |
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