CN110966021B - A renovate structure that is used for operation tunnel to strut large-scale cavity behind one's back - Google Patents
A renovate structure that is used for operation tunnel to strut large-scale cavity behind one's back Download PDFInfo
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- CN110966021B CN110966021B CN201911325165.5A CN201911325165A CN110966021B CN 110966021 B CN110966021 B CN 110966021B CN 201911325165 A CN201911325165 A CN 201911325165A CN 110966021 B CN110966021 B CN 110966021B
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- cavity
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- lining
- grouting
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- 230000003014 reinforcing effect Effects 0.000 claims abstract description 14
- 230000002787 reinforcement Effects 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 10
- 239000011435 rock Substances 0.000 claims abstract description 9
- 238000009418 renovation Methods 0.000 claims abstract description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 18
- 239000004567 concrete Substances 0.000 claims description 9
- 239000011381 foam concrete Substances 0.000 claims description 5
- 238000010276 construction Methods 0.000 abstract description 12
- 239000000463 material Substances 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 5
- 230000009471 action Effects 0.000 abstract description 3
- 239000002002 slurry Substances 0.000 description 5
- 239000000945 filler Substances 0.000 description 4
- 239000011796 hollow space material Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 230000008439 repair process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011440 grout Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005067 remediation Methods 0.000 description 1
- 238000007569 slipcasting Methods 0.000 description 1
Images
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
- E21D11/04—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
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
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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
- E21D11/10—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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Architecture (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Civil Engineering (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a renovation structure for a large cavity at the back of an operation tunnel support, and belongs to the field of tunnel construction. Comprises a filling group arranged in a cavity, a grouting group arranged in the cavity and a structure reinforcing group arranged at the inner side or (and) the outer side of the cavity, wherein the filling group comprises a plurality of groups of light filling bodies arranged in the cavity and gel arranged among the light filling bodies, the light filling bodies are arranged by being matched with the inner wall of the cavity and are uniformly arranged in the cavity, the rapid and effective structural reinforcement is carried out on the structural crack area or the section with insufficient thickness, and simultaneously the lining back cavity is filled and compacted by using the light material, thereby avoiding the damage to the existing lining structure in the construction process and thoroughly eliminating the potential safety hazard to the tunnel operation caused by the impact action of the primary support and the falling of surrounding rocks due to the existence of the lining back cavity, and the stress state of a tunnel support-surrounding rock system is improved, and the safety and the reliability of the tunnel are improved.
Description
Technical Field
The invention relates to the field of tunnel construction, in particular to a renovation structure for a large cavity at the back of an operation tunnel support.
Background
In tunnel engineering, the secondary lining is used as a main structure of a tunnel, has a function of safe storage, and has the function of beautifying a cavern. However, in the construction process, because the quality management and supervision are not in place or the overexcavation is carried out during construction and the overexcavation part is not backfilled, the phenomenon of cavities appears after the two backing materials. The cavity behind the two backing not only influences the realization of two lining construction quality and reinforcing and supporting function, influences two behind the cavity simultaneously and will line up the atress, makes the lining cutting local bear concentrated power, and forms the impact effect to the lining cutting when falling behind the country rock degradation, influences the normal operation of tunnel full life. Therefore, how to repair and cure the rear cavity after the second lining construction ensures that the thickness of the second lining meets the specification and design requirements, and is greatly helpful for improving the quality of the second lining construction and improving the stress of the lining.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a treatment structure for a large cavity at the back of an operation tunnel support, and the specific technical scheme is as follows:
the utility model provides a renovation structure for operation tunnel support large-scale cavity behind one's back which characterized in that, is including the packing group that sets up in the cavity, set up the slip casting group in the cavity and set up the structure reinforcement group in cavity department inboard and/or outside, and the packing group is including the multiunit light filling body that sets up in the cavity and set up the gel between the light filling body, and the light filling body pastes the setting of cavity inner wall and light filling body align to grid in the cavity.
In the invention, after a constructor detects a cavity area existing behind the secondary lining of the tunnel, a window communicated with the cavity, namely a skylight is arranged at the secondary lining below the cavity. Filling the light filler into the cavity after the skylight is opened, then grouting into the hole through the grouting group and forming gel in the gap between the light fillers, so that filling of the cavity without dead angles is realized, then implanting reinforcing steel bars into the skylight window of the secondary lining, combining the reinforcing steel bars with the concrete, spraying the concrete to close the skylight window, and finally performing structural reinforcement on the secondary lining through the structural reinforcement group.
Preferably, the grouting group comprises a plurality of groups of grouting pipes disposed in the hollow and passing through the tunnel lining and an overflow pipe disposed in the hollow and passing through the tunnel lining.
Preferably, the height of the grouting pipe is distributed in a step shape.
The invention increases the slurry outlet height of the grouting pipes in the hollow cavity in sequence by distributing the heights of the grouting pipes in a step shape, thereby realizing the function of layered grouting, and enabling the slurry to more uniformly fill the gaps among the light fillers without damaging the original lining.
Preferably, the structure reinforcing group comprises a reinforcing steel bar mesh arranged on the hollow hole, a plurality of groups of planting bars arranged in the reinforcing steel bar mesh and a concrete layer wrapping the reinforcing steel bar mesh.
Preferably, the arrangement shape of the reinforcing mesh reinforcement is an arc shape corresponding to the tunnel.
According to the invention, the arrangement shape of the reinforcing steel bar mesh is set to be the arc shape corresponding to the curved surface of the tunnel, so that the structural strength and the structural stability of the tunnel are improved.
Preferably, the sharp points on the two sides of the bottom of the hollow hole are provided with locking anchor rods, and the locking anchor rods penetrate through the lining and are arranged in the surrounding rock of the tunnel.
According to the invention, the locking anchor rods are arranged at the sharp points at the two sides of the bottom of the cavity to anchor the linings at the two sides of the cavity, so that the damage of the wedge point effect on the original lining in the cavity backfill construction process is prevented, and the structural stability of the tunnel is further improved.
Preferably, the tunnel is also provided with the structural reinforcing group at the inner side and/or the outer side of the hollow part.
Preferably, the lightweight filling body comprises PE balls, foam concrete blocks and PVC pipes.
The invention has the following beneficial effects:
according to the invention, the secondary lining is structurally reinforced through the structural reinforcing group, then the light filling bodies are filled in the tunnel cavities after the skylight is opened, and the gaps among the light filling bodies are filled through grouting of the grouting group, so that the repair and treatment of the cavities behind the secondary lining are finally realized, the thickness of the secondary lining is ensured to meet the specification and design requirements, and the normal operation of the tunnel in the whole service life is ensured. The method utilizes the residual performance of the existing lining structure to quickly and effectively reinforce the structure in a crack damage area or a section with insufficient thickness, and simultaneously uses a light material to densely fill the cavity behind the lining back, thereby avoiding the damage to the existing lining structure in the construction process, thoroughly eliminating the potential safety hazard of the impact action of the cavity behind the lining back to the operation of the tunnel, improving the stress state of a tunnel support-surrounding rock system and improving the safety and the reliability of the tunnel.
Drawings
FIG. 1 is a schematic structural view of a light-weight packing according to the present invention using PE balls;
FIG. 2 is a schematic view showing the construction of a block of foamed concrete used in the lightweight filling material according to the present invention;
FIG. 3 is a schematic structural diagram of a PVC pipe used as the light-weight filling body in the invention;
FIG. 4 is a schematic structural view of a structural reinforcement set according to the present invention;
FIG. 5 is a schematic structural diagram of a grouting set according to the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
Examples
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus once an item is defined in one figure, it is not further defined and explained by advocate in subsequent figures.
In the description of the present invention, it should be noted that the terms "first", "second", and the like are used only for distinguishing the description, and are not intended to indicate or imply relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "communicating," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
Referring to fig. 1 to 5, the invention comprises a filling group 1 arranged in the hollow space and used for filling the hollow space and a grouting group 2 arranged in the hollow space and used for transporting grouting slurry, and a structural reinforcing group 3 used for performing structural reinforcement on the secondary lining is also arranged at the position with insufficient lining thickness in the hollow space. The structure reinforcing group 3 is respectively arranged at the inner side and/or the outer side of the hollow position, and the structure reinforcing group 3 comprises a reinforcing steel bar mesh 31 arranged at the inner side and/or the outer side of the lining, a plurality of groups of planting bars 32 arranged in the reinforcing steel bar mesh 31 and a concrete layer 33 arranged on the reinforcing steel bar mesh 31. The embedded bars 32 are arranged perpendicular to the tunnel lining, and the concrete layer 33 provided on the reinforcing mesh reinforcement 31 is formed by casting or spraying concrete. The arrangement shape of the reinforcing steel bar mesh 31 is an arc shape corresponding to the tunnel, and the structural strength and the structural stability of the tunnel are improved by setting the section shape of the reinforcing steel bar mesh 31 to be the arc shape corresponding to the curved surface of the tunnel. The locking anchor rods 34 are arranged at the sharp points on the two sides of the bottom of the cavity, and the locking anchor rods 34 penetrate through the lining and are arranged in the surrounding rock of the tunnel.
With further reference to fig. 1 to 3, the filling set 1 includes a plurality of light-weight filling bodies 11 disposed in the cavities for filling the cavities and a gel 12 disposed between the light-weight filling bodies 11, wherein the light-weight filling bodies 11 are disposed in conformity with the inner walls of the cavities and the light-weight filling bodies 11 are uniformly arranged in the cavities. The lightweight filling body 11 comprises PE balls, foam concrete blocks and PVC pipes. The defect that a cavity with the height of more than 60cm to 130cm exists behind the support: after the skylight opening is adopted, firstly filling PE balls with the diameter of 15cm in the cavity, then closing the skylight opening, and finally filling gaps among the light fillers 11 by layered grouting to form gel 12; for the defect that a cavity with the height larger than 130cm exists behind the support, after a skylight opening is adopted, a PE ball with the diameter of 15cm or a rectangular foam concrete block with the length of 90cm, the length of x30cm, the width of x30cm and the height of 32mm or a PVC pipe with the diameter of 32mm is adopted for filling, the skylight opening is closed, and finally, the gaps are filled in a layered grouting mode for remediation.
In the invention, after a constructor detects a cavity area existing behind the secondary lining of the tunnel, the constructor firstly carries out structural reinforcement on the secondary lining of the tunnel through a structural reinforcement group 3, and then a window communicated with the cavity, namely a skylight is arranged at the position of the secondary lining positioned below the cavity. After a skylight is opened, the filling group 1 is placed in a cavity for filling, reinforcing steel bars are implanted into a secondary lining skylight, concrete is sprayed to close the skylight window, and finally, the light filling bodies 11 are filled in a layered manner through the grouting group 2 to form gel 12.
With further reference to fig. 1 and 5, the grouting group 2 comprises a plurality of groups of grouting pipes 21 arranged in the hollow and communicating with the tunnel and overflow pipes 22 arranged in the hollow and communicating with the tunnel. The height of the grouting pipe 21 is distributed in a step shape, so that the grout outlet height of the grouting pipe 21 in the cavity is sequentially increased, and the overflow pipe 22 in the previous stage becomes the grouting pipe 21 in the next stage, thereby realizing the function of layered grouting, enabling grout to more uniformly fill gaps between the light filling bodies 11 and avoiding damaging the original lining structure by one-time grouting. And when the slurry in the cavity flows out of the highest overflow pipe 22, the slurry in the cavity reaches the standard of filling the cavity, namely, the grouting is stopped.
According to the invention, the secondary lining is structurally reinforced through the structural reinforcing group 3, then the light filling bodies 11 are filled in the tunnel cavity after the skylight is opened, and the gaps among the light filling bodies 11 are filled through the grouting group 2, so that the repair and the treatment of the cavity behind the secondary lining are finally realized, the thickness of the secondary lining is ensured to meet the specification and design requirements, and the normal operation of the tunnel in the whole service life is ensured. The invention utilizes the residual performance of the existing lining structure to quickly and effectively reinforce the structure in the crack loss area or the section with insufficient thickness, and simultaneously uses light materials to densely fill the cavity behind the lining, thereby avoiding the damage to the existing lining structure in the construction process, thoroughly eliminating the potential safety hazard to the tunnel operation caused by the impact action of surrounding rocks and primary support falling caused by the cavity behind the lining, improving the stress state of a tunnel support-surrounding rock system, improving the safety and reliability of the tunnel, and having the advantages of safety, practicability, reliable quality, economy and reasonability.
It is to be noted that, in this document, the terms "comprises", "comprising" or any other variation thereof are intended to cover a non-exclusive inclusion, so that an article or apparatus including a series of elements includes not only those elements but also other elements not explicitly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of additional like elements in the article or device comprising the element.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. The method for renovating the large cavity behind the back of the support of the operating tunnel is characterized by comprising a filling group (1) arranged in the cavity, a grouting group (2) arranged in the cavity and a structural reinforcing group (3) arranged at the inner side of the cavity, wherein the filling group (1) comprises a plurality of groups of light filling bodies (11) arranged in the cavity and gel (12) arranged among the light filling bodies (11), the light filling bodies (11) are arranged by being attached to the inner wall of the cavity, and the light filling bodies (11) are uniformly arranged in the cavity;
the structure reinforcing group (3) comprises a reinforcing steel bar mesh (31) arranged on the hollow hole, a plurality of groups of planting bars (32) arranged in the reinforcing steel bar mesh (31) and a concrete layer (33) wrapping the reinforcing steel bar mesh (31);
the cross section of the reinforcing steel bar mesh (31) is arc-shaped corresponding to the tunnel;
two sides of the reinforcing steel bar mesh (31) are provided with locking anchor rods (34), and the locking anchor rods (34) penetrate through the lining and are arranged in the tunnel surrounding rock;
when adopting above-mentioned structure to operation tunnel support large-scale cavity behind the back of the body and renovating, including following step: after a cavity area existing at the back of the tunnel secondary lining is detected, the tunnel secondary lining is structurally reinforced through the structural reinforcing group (3), and then a skylight opening communicated with the cavity is formed in the secondary lining below the cavity; after a skylight is opened, the filling group (1) is placed in a cavity for filling, then a reinforcing steel bar is implanted into the skylight window of the secondary lining, concrete is sprayed to seal the skylight window, finally, the grouting group (2) is used for filling gaps among the light filling bodies (11) in a layered grouting mode to form the gel (12), and the residual performance of the existing lining structure is utilized to carry out quick and effective structural reinforcement on a cracked area or an area with insufficient thickness of the structure.
2. A method for renovating large cavities behind the backs of tunnel supports according to claim 1, characterized in that said grouting groups (2) comprise groups of grouting pipes (21) arranged in the cavities and passing through the tunnel lining and overflow pipes (22) arranged in the cavities and passing through the tunnel lining.
3. The method for renovating a large cavity behind a support of an operation tunnel as claimed in claim 2, wherein the height of the grouting pipe (21) is distributed in a step shape to realize layered grouting.
4. The renovation method for large cavities behind the backs of tunnel supports according to claim 1, characterized in that the light filling bodies (11) comprise PE balls, foam concrete blocks and PVC pipes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911325165.5A CN110966021B (en) | 2019-12-20 | 2019-12-20 | A renovate structure that is used for operation tunnel to strut large-scale cavity behind one's back |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911325165.5A CN110966021B (en) | 2019-12-20 | 2019-12-20 | A renovate structure that is used for operation tunnel to strut large-scale cavity behind one's back |
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| Publication Number | Publication Date |
|---|---|
| CN110966021A CN110966021A (en) | 2020-04-07 |
| CN110966021B true CN110966021B (en) | 2022-03-01 |
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| CN201911325165.5A Active CN110966021B (en) | 2019-12-20 | 2019-12-20 | A renovate structure that is used for operation tunnel to strut large-scale cavity behind one's back |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113338995B (en) * | 2021-05-31 | 2024-09-06 | 北京鸿锐嘉科技发展有限公司 | Anchor rod grouting construction method for existing tunnel |
| CN113669083B (en) * | 2021-10-08 | 2023-10-10 | 中铁第一勘察设计院集团有限公司 | Tunnel repairing structure based on load conversion and cap type and construction method thereof |
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| CN207212364U (en) * | 2017-09-20 | 2018-04-10 | 中铁十四局集团有限公司 | Composite lining structure after the empty Slag treatment in lining cutting behind |
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| CN110331993A (en) * | 2019-08-22 | 2019-10-15 | 西南交通大学 | A kind of filling and injecting slurry method of integrating tunnel lining quality defect blank repairing |
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2019
- 2019-12-20 CN CN201911325165.5A patent/CN110966021B/en active Active
Patent Citations (10)
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|---|---|---|---|---|
| SU1446321A1 (en) * | 1985-11-06 | 1988-12-23 | Донецкий политехнический институт | Method of preventing caving of coal above the roof of workings driven in outburst-hazardous seams |
| CN104632248A (en) * | 2015-01-22 | 2015-05-20 | 山东大学 | Protection and treatment method for tunnel top karst cave |
| CN104975861A (en) * | 2015-07-21 | 2015-10-14 | 招商局重庆交通科研设计院有限公司 | Non-disturbance type supporting structure used for tunnel vault collapsed cavity processing |
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Effective date of registration: 20240423 Address after: 610031 north section of two ring road, Sichuan, Chengdu Patentee after: SOUTHWEST JIAOTONG University Country or region after: China Patentee after: CHINA RAILWAY 18 BUREAU GROUP Co.,Ltd. Address before: 610031 No. two, section 111, ring road, Chengdu, Sichuan, China Patentee before: SOUTHWEST JIAOTONG University Country or region before: China |
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