CN109372543B - Tunnel lining underthickness reinforcement structure and construction method - Google Patents
Tunnel lining underthickness reinforcement structure and construction method Download PDFInfo
- Publication number
- CN109372543B CN109372543B CN201811598564.4A CN201811598564A CN109372543B CN 109372543 B CN109372543 B CN 109372543B CN 201811598564 A CN201811598564 A CN 201811598564A CN 109372543 B CN109372543 B CN 109372543B
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- Prior art keywords
- lining
- underthickness
- tunnel
- primary support
- secondary lining
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- 230000002787 reinforcement Effects 0.000 title claims abstract description 28
- 238000010276 construction Methods 0.000 title abstract description 23
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 34
- 239000010959 steel Substances 0.000 claims abstract description 34
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 15
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000003292 glue Substances 0.000 claims abstract description 11
- 239000011435 rock Substances 0.000 claims abstract description 9
- 238000005507 spraying Methods 0.000 claims abstract description 4
- 238000005219 brazing Methods 0.000 claims description 10
- 238000013461 design Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 3
- 239000004745 nonwoven fabric Substances 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 2
- 230000001070 adhesive effect Effects 0.000 claims description 2
- 238000009415 formwork Methods 0.000 abstract description 2
- 230000007547 defect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 201000010099 disease Diseases 0.000 description 3
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 3
- 238000010009 beating Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007569 slipcasting Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D11/003—Linings or provisions thereon, specially adapted for traffic tunnels, e.g. with built-in cleaning devices
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
-
- 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
Abstract
The invention discloses a tunnel lining lack-thickness reinforcement structure and a construction method, wherein the reinforcement structure comprises a new built secondary lining and a new built primary support which are arranged in a tunnel lining lack-thickness area, the new built secondary lining is connected with an existing secondary lining, the new built primary support is connected with the existing primary support, a plurality of mortar anchor rods which are arranged at the connection part of the new built primary support and the existing primary support, and a plurality of grouting steel flower pipes which are arranged in the tunnel lining lack-thickness area; the construction method comprises the steps of setting a temporary steel frame support; reinforcing surrounding rock by adopting a grouting steel flowtube; dismantling a dismantling section of the tunnel lining underthickness area, erecting a permanent steel frame support at the dismantling section, and spraying concrete to form a newly built primary support; and (3) a mortar anchor rod is arranged, a drill nail and water stop glue of a newly built secondary lining and an existing secondary lining connecting surface are constructed, a lining waterproof layer is paved between the newly built secondary lining and a newly built primary support, and then a formwork is erected and the newly built secondary lining is poured.
Description
Technical Field
The invention relates to the technical field of railway engineering construction, in particular to a tunnel lining underthickness reinforcement structure and a construction method.
Background
The railway construction history of China is long, and the railway operation mileage of China reaches 12.4 ten thousand kilometers by 2016, wherein the high-speed railway operation mileage is more than 2.2 ten thousand kilometers. However, as the operation time increases, a large number of tunnels begin to suffer from diseases, such as water leakage, cracking of lining, lack of thickness of lining, holes or incompact lining back, and the like, and a great potential safety hazard exists. Especially, the tunnel built by the eighth and nineties is more serious in defect, and the problem of tunnel defect needs to be solved and treated. The lining underthickness defect is the most dangerous defect, the lining underthickness indicates that the thickness of a lining structure cannot meet the design or specification requirements, the lining cannot completely bear the load such as surrounding rock, the possibility of collapse and block falling at any time exists, the normal operation of a tunnel is seriously influenced, and huge economic loss is caused. At present, the treatment measures for lack of thickness of the lining are mainly grouting reinforcement, steel arch reinforcement and other measures, and in order to thoroughly solve the harm of lack of thickness of the lining, the replacement of the lining is a better solution, and how to effectively and quickly replace the lining is a problem which needs to be solved at present, and is also the research direction for the lack of thickness of the lining after treatment.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a tunnel lining lack-thickness reinforcing structure and a construction method, provides scientific basis for solving the safety problem possibly caused by tunnel lining lack-thickness, thoroughly and effectively treats lining damage and ensures the operation safety of a tunnel.
In order to achieve the above object, the present invention provides the following technical solutions:
the utility model provides a tunnel lining is owed thick reinforcement structure, includes new construction secondary lining and the new construction preliminary bracing that is equipped with in tunnel lining owed thick region, new construction secondary lining is connected with existing secondary lining, new construction preliminary bracing is connected with existing preliminary bracing, still includes a plurality of mortar anchor rods that are equipped with in the junction of new construction preliminary bracing and existing preliminary bracing to and a plurality of slip casting steel floral tube that is equipped with in tunnel lining owes thick region.
According to the invention, the existing secondary lining and the existing primary support of the tunnel lining underthick area are replaced by newly built secondary lining and newly built primary support, the stability of the joint is enhanced by the mortar anchor rod, surrounding rock is reinforced by grouting the steel pipe, a reasonable, safe and stable reinforcing structure is formed, diseases such as the lining underthick, the lining back cavity and the like can be effectively remedied, the occurrence of potential safety hazards such as collapse, block falling and the like affecting tunnel operation is prevented, the safety of the tunnel structure is ensured, the engineering operation maintenance investment is indirectly saved, and the tunnel lining underthick reinforcing design is more reasonable, safe and reliable.
Preferably, the newly-built secondary lining and the existing secondary lining are connected through a plurality of brazing nails, preferably, the brazing nails are longitudinally and transversely arranged at intervals on the connecting surface between the newly-built secondary lining and the existing secondary lining, and the joint between the newly-built secondary lining and the existing secondary lining is firmer due to the fact that the reinforcing steel bar planting glue is arranged at each brazing nail.
Preferably, a water stop glue is arranged on the connecting surface between the newly built secondary lining and the existing secondary lining for improving the water resistance.
Preferably, a lining waterproof layer is laid between the newly-built secondary lining and the newly-built primary support, so that the waterproof performance of the lining waterproof layer is improved.
Preferably, the lining waterproof layer comprises a water plate and a non-woven fabric.
Preferably, grouting holes are reserved in the arch part of the newly built secondary lining, some serious underthickness parts (such as within 10 degrees of the arch part) can appear in the tunnel locally, and the lining underthickness parts can be locally grouting backfilled through the grouting holes, so that the stability of the lining is enhanced.
Preferably, the grouting steel flowtube is arranged in a plum blossom shape, so that surrounding rocks around the tunnel can be effectively reinforced.
The invention also discloses a construction method of the tunnel lining underthickness reinforcement structure, which is used for constructing any one of the tunnel lining underthickness reinforcement structures and comprises the following steps:
step one: temporary steel frame supports are arranged at the position of the tunnel lining underthickness area and at two sides of the tunnel lining underthickness area;
step two: reinforcing surrounding rock of the tunnel lining underthickness area by adopting a grouting steel flowtube;
step three: a plurality of first dismantling sections of the tunnel lining underthickness area are dismantled at intervals, permanent steel frame supports are erected on the first dismantling sections, and concrete is sprayed to form new primary supports;
step four: removing the temporary steel frame support, continuously removing a second dismounting section between the first dismounting sections, erecting a permanent steel frame support on the second dismounting section, and spraying concrete to form a new primary support;
step five: and (3) a mortar anchor rod is arranged at the joint of the newly-built primary support and the existing primary support, a drill nail and water stop glue of the connecting surface of the newly-built secondary lining and the existing secondary lining are constructed, a lining waterproof layer is paved between the newly-built secondary lining and the newly-built primary support, and then a formwork is erected and the newly-built secondary lining is poured.
The construction method of the invention forms a tunnel lining lack-thickness reinforcement structure by dismantling the existing lining of the lack-thickness section of the lining, newly constructing the lining, and then reinforcing the lining by beating the mortar anchor rod and the grouting steel pipe, thus the whole construction method is simple and easy, the reinforcing effect is good, the lining can be effectively and quickly dismantled and replaced, the lack-thickness hazard of the lining is solved, and the safety of tunnel operation is ensured.
Preferably, the method further comprises the step six: and after the newly built secondary lining concrete reaches the design strength, grouting and backfilling the lining underthickness part through a reserved grouting hole.
Compared with the prior art, the reinforcing structure has the beneficial effects that:
according to the invention, the existing secondary lining and the existing primary support of the tunnel lining underthick area are replaced by newly built secondary lining and newly built primary support, the stability of the joint is enhanced by the mortar anchor rod, surrounding rock is reinforced by grouting the steel pipe, a reasonable, safe and stable reinforcing structure is formed, diseases such as the lining underthick, the lining back cavity and the like can be effectively remedied, the occurrence of potential safety hazards such as collapse, block falling and the like affecting tunnel operation is prevented, the safety of the tunnel structure is ensured, the engineering operation maintenance investment is indirectly saved, and the tunnel lining underthick reinforcing design is more reasonable, safe and reliable.
Compared with the prior art, the construction method of the reinforcing structure has the beneficial effects that:
the construction method of the invention forms a tunnel lining lack-thickness reinforcement structure by dismantling the existing lining of the lack-thickness section of the lining, newly constructing the lining, and then reinforcing the lining by beating the mortar anchor rod and the grouting steel pipe, thus the whole construction method is simple and easy, the reinforcing effect is good, the lining can be effectively and quickly dismantled and replaced, the lack-thickness hazard of the lining is solved, and the safety of tunnel operation is ensured.
Description of the drawings:
FIG. 1 is a cross-sectional view of a tunnel lining underbump reinforcement structure in accordance with the present invention.
FIG. 2 is a diagram showing the connection between old and new concrete of the lining under-thickness reinforcement structure according to the present invention.
FIG. 3 is a cross-sectional I-I view of an underthickness reinforcement structure of a lining according to the present invention.
Fig. 4 is a schematic diagram of a step three of the lining underthickness reinforcement construction method according to the present invention.
Fig. 5 is a schematic diagram of a step four of the lining underthickness reinforcement construction method according to the present invention.
The marks in the figure: 1-existing secondary lining, 2-existing primary support, 3-newly built secondary lining, 4-newly built primary support, 5-grouting holes, 6-brazing nails, 7-mortar anchor rods, 8-bar planting glue, 9-water stop glue, 10-lining waterproof layers, 11-lining underthick parts, 12-grouting steel flower pipes, 13-replacing section I, 14-temporary steel frame support, 15-permanent steel frame support and 16-replacing section II.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. It should not be construed that the scope of the above subject matter of the present invention is limited to the following embodiments, and all techniques realized based on the present invention are within the scope of the present invention.
Example 1
As shown in fig. 1 to 3, a tunnel lining underthickness reinforcement structure includes a newly built secondary lining 3 and a newly built primary support 4 provided in an underthickness area of the tunnel lining.
The new primary support 4 is connected with the existing primary support 2, a plurality of mortar anchor rods 7 are arranged at the joint of the new primary support 4 and the existing primary support 2, and the stability of the joint is enhanced through the mortar anchor rods 7.
The novel secondary lining 3 is connected with the existing secondary lining 1 through a plurality of brazing nails 6, the brazing nails 6 are longitudinally and transversely arranged at intervals on the connecting surface between the novel secondary lining 3 and the existing secondary lining 1, and the joint of each brazing nail 6 is provided with a bar planting adhesive 8. Specifically, the existing secondary lining 1 is drilled, the drill nails 6 are implanted, and the bar planting glue 8 is applied, so that the newly built secondary lining 3 and the existing secondary lining 1 are firmly meshed. Meanwhile, the water stop glue 9 is arranged on the connecting surface between the newly built secondary lining 3 and the existing secondary lining 1, so that the waterproof performance of the newly built secondary lining is improved.
Further, a lining waterproof layer 10 is laid between the newly-built secondary lining 3 and the newly-built primary support 4, and the lining waterproof layer 10 comprises a water plate and a non-woven fabric for improving the waterproof performance of the lining.
In order to further tunnel surrounding rock, a plurality of grouting steel flowtubes 12 are arranged in an underthickness area of a tunnel lining, grouting holes 5 are reserved at the arch part of the newly built secondary lining 3, and local grouting backfilling is carried out on the underthickness part 11 of the lining through the reserved grouting holes 5.
Example 2
A construction method of a tunnel lining underthickness reinforcement structure comprises the following steps:
step one: before the underthickness section of the lining is detached, defect repair of the adjacent section is finished firstly, temporary steel frame supports 14 are arranged at the underthickness area of the tunnel lining and on the two sides of the underthickness area of the tunnel lining, and the temporary steel frame supports 14 are longitudinally arranged at intervals;
step two: reinforcing surrounding rock of the tunnel lining underthickness area by adopting grouting steel flowtube 12, wherein grouting steel flowtube 12 is arranged at plum blossom type intervals in the disassembling and replacing section;
step three: a plurality of first dismantling sections 13 of the tunnel lining underthickness area are dismantled at intervals, permanent steel frame supports 15 are erected on the first dismantling sections 13, concrete is sprayed, and a new primary support 4 is formed, as shown in fig. 4;
step four: removing the temporary steel frame supports 14, continuously removing a second replacement section 16 between the first replacement sections 13, erecting a permanent steel frame support 15 on the second replacement section 16 every time the second replacement section 16 is removed, and spraying concrete to form a new primary support 4, as shown in fig. 5;
step five: a mortar anchor rod 7 is arranged at the joint of the new primary support 4 and the existing primary support 2, a drill pin 6 and a water stop glue 9 of the joint surface of the new secondary lining 3 and the existing secondary lining 1 are constructed, a lining waterproof layer 10 is paved between the new secondary lining 3 and the new primary support 4, and then a mould is erected and the new secondary lining 3 is poured;
step six: and after the concrete of the newly built secondary lining 3 reaches the design strength, locally grouting and backfilling the lining underthickness part 11 through the reserved grouting holes 5.
In actual operation, before the first step is implemented, the lining thickness of each area of the tunnel needs to be measured and recorded, the lining underthickness areas which do not meet the requirements are screened, then, according to the lining strength requirements, the design calibration is carried out on the newly built secondary lining thickness of each lining underthickness area which is required to be constructed, and then, the construction is carried out on the newly built secondary lining of each lining underthickness area through the first step to the sixth step.
The above embodiments are only for illustrating the present invention and not for limiting the technical solutions described in the present invention, and although the present invention has been described in detail in the present specification with reference to the above embodiments, the present invention is not limited to the above specific embodiments, and thus any modifications or equivalent substitutions are made to the present invention; all technical solutions and modifications thereof that do not depart from the spirit and scope of the invention are intended to be covered by the scope of the appended claims.
Claims (8)
1. The tunnel lining underthickness reinforcement structure is characterized by comprising a new built secondary lining (3) and a new built primary support (4) which are arranged in an underthickness area of a tunnel lining, wherein the new built secondary lining (3) and an existing secondary lining (1) are connected in a circumferential direction of a tunnel cross section, the new built primary support (4) and the existing primary support (2) are connected in the circumferential direction of the tunnel cross section, a plurality of mortar anchor rods (7) which are arranged at the connection part of the new built primary support (4) and the existing primary support (2) and a plurality of grouting steel tubes (12) which are arranged in the underthickness area of the tunnel lining;
the tunnel lining underthickness reinforcement structure is constructed, and the method comprises the following steps: step one: temporary steel frame supports (14) are arranged at the position of the tunnel lining underthickness area and at the two sides of the tunnel lining underthickness area;
step two: reinforcing surrounding rock of the tunnel lining underthickness area by adopting a grouting steel flowtube (12);
step three: a plurality of first dismantling sections (13) of the tunnel lining underthickness area are dismantled at intervals, permanent steel frame supports (15) are erected on the first dismantling sections (13), and concrete is sprayed to form new primary supports (4);
step four: removing the temporary steel frame support (14), continuously removing a second dismounting section (16) between the first dismounting section (13), erecting a permanent steel frame support (15) on the second dismounting section (16), and spraying concrete to form a newly built primary support (4);
step five: a mortar anchor rod (7) is arranged at the joint of the newly built primary support (4) and the existing primary support (2), a drill nail (6) and a water stop adhesive (9) of the joint surface of the newly built secondary lining (3) and the existing secondary lining (1) are constructed, a lining waterproof layer (10) is paved between the newly built secondary lining (3) and the newly built primary support (4), and then the newly built secondary lining (3) is erected and poured;
step six: and after the concrete of the newly built secondary lining (3) reaches the design strength, grouting and backfilling the lining underthickness part (11) through a reserved grouting hole (5).
2. The tunnel lining underthickness reinforcement structure according to claim 1, wherein the newly built secondary lining (3) and the existing secondary lining (1) are connected by a plurality of brazing nails (6).
3. A tunnel lining underthickness reinforcement structure according to claim 2, characterized in that the brazing nails (6) are arranged at a longitudinal and transverse interval at the junction between the newly built secondary lining (3) and the existing secondary lining (1).
4. A tunnel lining underthickness reinforcement structure according to claim 2, further comprising a bead-planting glue (8) provided at each of the brazing nails (6), and a water-stopping glue (9) provided at a junction surface between the newly built secondary lining (3) and the existing secondary lining (1).
5. The tunnel lining underthickness reinforcement structure according to claim 1, wherein a lining waterproof layer (10) is laid between the newly built secondary lining (3) and the newly built primary support (4).
6. A tunnel lining underthickness reinforcement structure according to claim 5, wherein the lining waterproof layer (10) comprises a water sheet and a nonwoven fabric.
7. The tunnel lining underthickness reinforcement structure according to any one of claims 1 to 6, characterized in that grouting holes (5) are reserved in the arch portion of the newly built secondary lining (3).
8. A tunnel lining underthickness reinforcement structure according to any one of claims 1-6, wherein the grouting steel flowtube (12) is arranged in a quincuncial pattern.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811598564.4A CN109372543B (en) | 2018-12-25 | 2018-12-25 | Tunnel lining underthickness reinforcement structure and construction method |
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| CN201811598564.4A CN109372543B (en) | 2018-12-25 | 2018-12-25 | Tunnel lining underthickness reinforcement structure and construction method |
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| CN109372543A CN109372543A (en) | 2019-02-22 |
| CN109372543B true CN109372543B (en) | 2024-01-23 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110593909A (en) * | 2019-10-18 | 2019-12-20 | 中铁隧道局集团有限公司 | Tunnel secondary lining dismounting and replacing construction method |
| CN111206941B (en) * | 2020-01-15 | 2021-07-27 | 中铁十六局集团有限公司 | Tunnel lining thickness deficiency processing method |
| CN111271097A (en) * | 2020-03-30 | 2020-06-12 | 中铁二院工程集团有限责任公司 | Construction joint waterproof structure suitable for reconstructing tunnel lining and construction method thereof |
| CN112096422A (en) * | 2020-10-25 | 2020-12-18 | 山西省交通科技研发有限公司 | Structure and method for repairing primary support invasion limit of large-section weak surrounding rock tunnel |
| CN112096419A (en) * | 2020-10-25 | 2020-12-18 | 山西省交通科技研发有限公司 | Supporting structure and method for repairing tunnel secondary lining damage |
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