CN110985053A - Method for renovating large cavity behind support of operating tunnel - Google Patents
Method for renovating large cavity behind support of operating tunnel Download PDFInfo
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- CN110985053A CN110985053A CN201911326249.0A CN201911326249A CN110985053A CN 110985053 A CN110985053 A CN 110985053A CN 201911326249 A CN201911326249 A CN 201911326249A CN 110985053 A CN110985053 A CN 110985053A
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000009418 renovation Methods 0.000 claims abstract description 9
- 230000002787 reinforcement Effects 0.000 claims description 34
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 27
- 239000004567 concrete Substances 0.000 claims description 14
- 239000004568 cement Substances 0.000 claims description 13
- 230000003014 reinforcing effect Effects 0.000 claims description 10
- 238000005553 drilling Methods 0.000 claims description 9
- 239000011381 foam concrete Substances 0.000 claims description 7
- 239000000945 filler Substances 0.000 claims description 5
- 239000011796 hollow space material Substances 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 238000007689 inspection Methods 0.000 claims description 2
- 239000011378 shotcrete Substances 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims 1
- 238000011835 investigation Methods 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 16
- 239000000463 material Substances 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 4
- 239000011435 rock Substances 0.000 abstract description 4
- 230000009471 action Effects 0.000 abstract description 2
- 238000005429 filling process Methods 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000009407 construction method and process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000005067 remediation Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
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Classifications
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- 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
- 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 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
- E21D11/05—Lining with building materials using compressible insertions
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- 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
- E21D11/107—Reinforcing elements therefor; Holders for the reinforcing elements
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- 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
- E21D11/14—Lining predominantly with metal
- E21D11/15—Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
- E21D11/152—Laggings made of grids or nettings
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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
Abstract
The invention discloses a method for renovating a large cavity behind a support back of an operating tunnel, which sequentially comprises the following steps: checking and positioning the position of a large tunnel cavity, excavating a sky window, and filling a filling group into the cavity; and (4) closing a roof window of the lining, and finally performing layered grouting. 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, thereby avoiding the damage to the existing lining structure in the construction process, thoroughly eliminating the potential safety hazard of the impact action of falling blocks of surrounding rocks above the cavity behind the lining on the operation of the tunnel, improving the stress state of a tunnel support-surrounding rock system, and having stronger safety and operability in the renovation method and process.
Description
Technical Field
The invention relates to the field of tunnel construction, in particular to a method for renovating a large cavity behind a support of an operating tunnel.
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 method for renovating a large cavity behind a support back of an operating tunnel, which has the following specific technical scheme:
a method for renovating a large cavity behind a support of an operating tunnel sequentially comprises the following steps:
(S1): checking the tunnel, determining the position and scale of a cavity at the back of the tunnel, and selecting a corresponding remediation scheme according to different scales of the cavity;
(S2): and (2) arranging a skylight opening on the tunnel lining below the hollow space, and then filling a light filler into the hollow space through the skylight opening:
(S2-1): when the height of the cavity is less than or equal to 60cm, directly filling the cavity of the cavity by adopting drilling grouting without opening a skylight;
(S2-2): when the height of the cavity is more than 60cm and less than or equal to 130cm, filling the cavity of the cavity with a PE ball with the diameter of 10-20 cm;
(S2-3): when the cavity is higher than 130cm, filling a light filling body by adopting a PE ball, a foam concrete block or a PVC pipe;
(S3): and closing a skylight opening of the tunnel lining and performing layered grouting into the cavity through a grouting system.
In the invention, after a constructor detects a cavity area existing at the back of the secondary lining of the tunnel, a window communicated with the cavity, namely a skylight is arranged on the secondary lining below the cavity. And finally, filling gaps among the light fillers in a layered manner through a grouting system, ensuring that the holes are filled compactly and do not damage the original lining structure, and ensuring that the tunnel can be operated normally in a full life.
Preferably, in the step (S2), when the thickness of the tunnel lining is less than 70% of the design thickness, the structural reinforcement group is applied to the clear side of the tunnel for structural reinforcement when the height of the cavity is not more than 130cm, and the structural reinforcement group is applied to the outer side (bottom of the cavity) of the lining when the height of the cavity is more than 130cm, so that the thickness of the tunnel lining reaches the original design thickness.
According to the invention, constructors do structural reinforcement on the position with insufficient lining thickness by using the structural reinforcement group to perform structural reinforcement, so that the problems of collapse and the like caused by insufficient structural strength in the filling process of the light filling body of the tunnel are prevented, and the construction safety and operability are ensured.
Preferably, the structure reinforcing group comprises reinforcing steel bar meshes arranged on the inner side and/or the outer side of the lining, a plurality of groups of planting bars arranged in the reinforcing steel bar meshes and a concrete layer wrapping the reinforcing steel bar meshes.
Preferably, in the step (S3), when the height of the cavity is 160cm or less, grouting is performed in two times; and grouting for at least three times when the height of the hollow is more than 160 cm.
According to the invention, the gaps between the cavities and the light filling bodies are filled by adopting layered grouting, so that the safety coefficient is continuously increased, the probability of gap residue is reduced, and the grouting filling efficiency is improved.
Preferably, the layered grouting needs to be performed after the former layer meets the structural strength, and then the later layer of cement paste is poured.
According to the invention, the previous layer meets the structural strength during layered grouting, and then the next layer of cement paste is poured, so that the filling effect and the structural strength of each layer of cement paste are ensured.
Preferably, the step (S3) of closing the skylight opening includes implanting a ring into the lining skylight opening, longitudinal steel bars, and shotcrete wrapping the steel bars.
Preferably, the tunnel inspection in the step (S1) is a geological radar survey or a borehole survey.
Preferably, the light weight filling material is filled in the step (S2) by setting the bottom side of the light weight filling material into an arch shape as a first layer and then depositing the light weight filling material on the top until the light weight filling material is filled to the top of the hollow space.
The invention has the following beneficial effects:
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. The skylight is opened according to the specification and the size of the cavity, different light filling bodies are selected and used for filling the cavity of the cavity, reinforcing steel bars are implanted into the skylight window of the secondary lining, concrete is sprayed into the skylight window in a grid-connected mode to close the skylight window, finally, gaps among the light filling bodies are filled through grouting pipes in a layered grouting mode, the thickness of the two linings is guaranteed to meet the road passing specification and design requirements, and the tunnel can be normally operated in the whole service life. The method utilizes the residual performance of the existing lining structure to quickly and effectively reinforce the structure in a crack loss area or an area 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 tunnel operation, improving the stress state of a tunnel support-surrounding rock system, having stronger safety and operability in the renovation construction method and process, and being safe, practical, reliable in quality, economic and reasonable.
Drawings
FIG. 1 is a schematic structural view of a tunnel void in the present invention;
FIG. 2 is a schematic structural view of the light-weight filler of the present invention as a PE ball;
FIG. 3 is a schematic structural view of the present invention in which the light weight filler is foam concrete;
FIG. 4 is a schematic structural view of the light-weight packing of the present invention, which is a PVC pipe;
FIG. 5 is a schematic view of the construction of the grouting pipe according to the present invention;
FIG. 6 is a schematic structural view of the structural reinforcement set of 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.
Example 1
Referring to fig. 1 to 6, the method for renovating a cavity 1 behind a tunnel support in the invention sequentially comprises the following steps:
(S1): detecting or drilling a tunnel by adopting a geological radar and determining the position and specification of a cavity 1 at the back of the tunnel;
(S2): when the thickness of the tunnel lining is less than 70% of the design thickness, the structural reinforcement group 3 is implanted at the clear side of the tunnel for structural reinforcement when the height of the cavity is less than or equal to 130cm, and the structural reinforcement group 3 is applied at the outer side (bottom of the cavity) of the lining for structural reinforcement when the height of the cavity is greater than 130cm, so that the thickness of the tunnel lining reaches the original design thickness.
The height of the cavity 1 is less than or equal to 60cm, and the cavity of the cavity 1 is directly filled by adopting drilling grouting;
constructor carries out the structural reinforcement through constructing lining cutting structure reinforcement group 3 to the clear side of tunnel, structural reinforcement group 3 is including setting up reinforcing bar net 31 in cavity lining cutting inboard and/or outside, setting up multiunit bar planting 32 in reinforcing bar net 31 and setting up the concrete layer 33 on reinforcing bar net 31, prevents that the tunnel from taking place to destroy because structural strength is not enough in the light obturator filling process, collapsing scheduling problem, has guaranteed construction safety and maneuverability.
(S3): carrying out layered grouting on the cavity 1 by two times through a grouting pipe 7, wherein during layered grouting, after the former layer meets the structural strength, the latter layer of cement paste is grouted again;
according to the invention, the cavity 1 is filled in a graded manner by adopting layered grouting, so that the safety coefficient is increased continuously, the probability of gap residue is reduced, and the grouting filling efficiency is improved.
Example 2
Referring further to fig. 2, the method for renovating a cavity 1 behind a tunnel support in the present invention sequentially comprises the following steps:
(S1): detecting or drilling a tunnel by adopting a geological radar and determining the position and specification of a cavity 1 at the back of the tunnel;
(S2): when the thickness of the tunnel lining is less than 70% of the design thickness, the structural reinforcement group 3 is implanted at the clear side of the tunnel for structural reinforcement when the height of the cavity is less than or equal to 130cm, and the structural reinforcement group 3 is applied at the outer side (bottom of the cavity) of the lining for structural reinforcement when the height of the cavity is greater than 130cm, so that the thickness of the tunnel lining reaches the original design thickness. The structure reinforcing group 3 comprises reinforcing steel bar meshes 31 arranged on the inner side and/or the outer side of the cavity lining, a plurality of groups of embedded bars 32 arranged in the reinforcing steel bar meshes 31 and a concrete layer 33 arranged on the reinforcing steel bar meshes 31, so that the problems of collapse and the like caused by insufficient structural strength in the filling process of the light filling body of the tunnel are prevented, and the construction safety and operability are ensured;
the height of the cavity 1 is more than 60cm and less than or equal to 130cm, a skylight opening 2 is arranged below the cavity 1 and lined in the tunnel, and a PE ball 4 with the diameter of 10-20cm is used for filling the cavity of the cavity 1; when filling, the bottom side of the hollow cavity is prefabricated into an arch shape to be used as a first layer, and then the light filling body is piled up on the first layer until the top of the hollow cavity is filled.
(S3): and implanting annular reinforcing steel bars into the lining skylight opening 2, spraying concrete on the annular reinforcing steel bars, sealing the tunnel lining skylight opening 2, performing layered grouting for twice grouting into the cavity 1 through the grouting pipe 7, and grouting the later layer of cement slurry after the former layer meets the structural strength during layered grouting.
Example 3
Referring further to fig. 3, the method for renovating a cavity 1 behind a tunnel support in the present invention sequentially includes the following steps:
(S1): detecting or drilling a tunnel by adopting a geological radar and determining the position and specification of a cavity 1 at the back of the tunnel;
(S2): when the thickness of the tunnel lining is less than 70% of the design thickness, the structural reinforcement group 3 is implanted at the clear side of the tunnel for structural reinforcement when the height of the cavity is less than or equal to 130cm, and the structural reinforcement group 3 is applied at the outer side (bottom of the cavity) of the lining for structural reinforcement when the height of the cavity is greater than 130cm, so that the thickness of the tunnel lining reaches the original design thickness. The structure reinforcing group 3 comprises reinforcing steel bar meshes 31 arranged on the inner side and/or the outer side of the cavity lining, a plurality of groups of planting bars 32 arranged in the reinforcing steel bar meshes 31 and a concrete layer 33 arranged on the reinforcing steel bar meshes 31, so that the problems of collapse and the like caused by insufficient structural strength in the filling process of the light filling body of the tunnel are prevented, and the construction safety and operability are ensured;
the method comprises the steps that a cavity 1 is higher than 130cm, a skylight opening 2 is formed below the cavity 1 in a tunnel lining, if the lining thickness of an arch part is smaller than 70cm, ribs 32 are planted firstly, concrete is sprayed for reinforcement, then, foam concrete 6 is prefabricated into cuboid foam concrete 6 blocks which are 90cm (length), 30cm (width), 30cm (height) for building, the bottom side of the cuboid foam concrete is prefabricated into an arch shape to serve as a first layer during filling, and then, a light filling body is stacked on the top of the cuboid foam concrete until the light filling body is filled to the top of the cavity.
(S3): the lining skylight 2 is implanted with the annular reinforcing steel bars and sprayed with concrete to seal the skylight 2 of the tunnel lining, when the height of the cavity 1 is larger than 160cm, layered grouting with not less than three times of grouting is carried out in the cavity 1 through the grouting pipe 7, the later layer of cement paste needs to be re-poured after the former layer reaches certain strength during layered grouting, and the later layer of cement paste needs to be re-poured after the former layer meets the structural strength during layered grouting.
Example 4
Referring further to fig. 4, the method for renovating a cavity 1 behind a tunnel support in the present invention sequentially includes the following steps:
(S1): detecting or drilling a tunnel by adopting a geological radar and determining the position and specification of a cavity 1 at the back of the tunnel;
(S2): when the thickness of the tunnel lining is less than 70% of the design thickness, the structural reinforcement group 3 is implanted at the clear side of the tunnel for structural reinforcement when the height of the cavity is less than or equal to 130cm, and the structural reinforcement group 3 is applied at the outer side (bottom of the cavity) of the lining for structural reinforcement when the height of the cavity is greater than 130cm, so that the thickness of the tunnel lining reaches the original design thickness. The structure reinforcing group 3 comprises reinforcing steel bar meshes 31 arranged on the inner side and/or the outer side of the cavity lining, a plurality of groups of embedded bars 32 arranged in the reinforcing steel bar meshes 31 and a concrete layer 33 arranged on the reinforcing steel bar meshes 31, so that the problems of collapse and the like caused by insufficient structural strength in the filling process of the light filling body of the tunnel are prevented, and the construction safety and operability are ensured;
the cavity 1 is higher than and larger than 130cm, a skylight opening 2 is formed below the cavity 1 in a tunnel lining, after the skylight opening 2 is formed, reinforcing steel bars are bound with PVC pipes 5 manually, an arch is prefabricated to be a first layer, then the PVC pipes 5 are stacked on the top until the PVC pipes are filled to the top of the cavity 1, after the PVC pipes 5 with the diameter of 110mm are placed in the holes, the PVC pipes 5 with the diameter of 32mm are used for filling, and two ends of each PVC pipe 5 are sealed to avoid cement slurry filling. When filling, the bottom side of the hollow cavity is prefabricated into an arch shape to be used as a first layer, and then the light filling body is piled up on the first layer until the top of the hollow cavity is filled.
(S3): the lining skylight 2 is implanted with the annular reinforcing steel bars and sprayed with concrete to seal the skylight 2 of the tunnel lining, when the height of the cavity 1 is larger than 160cm, layered grouting with not less than three times of grouting is carried out in the cavity 1 through the grouting pipe 7, the later layer of cement paste needs to be re-poured after the former layer reaches certain strength during layered grouting, and the later layer of cement paste needs to be re-poured after the former layer meets the structural strength during layered grouting.
Example 5
Referring further to fig. 2, the method for renovating a cavity 1 behind a tunnel support in the present invention sequentially comprises the following steps:
(S1): detecting or drilling a tunnel by adopting a geological radar and determining the position and specification of a cavity 1 at the back of the tunnel;
(S2): when the thickness of the tunnel lining is less than 70% of the design thickness, the structural reinforcement group 3 is implanted at the clear side of the tunnel for structural reinforcement when the height of the cavity is less than or equal to 130cm, and the structural reinforcement group 3 is applied at the outer side (bottom of the cavity) of the lining for structural reinforcement when the height of the cavity is greater than 130cm, so that the thickness of the tunnel lining reaches the original design thickness. The structure reinforcing group 3 comprises reinforcing steel bar meshes 31 arranged on the inner side and/or the outer side of the cavity lining, a plurality of groups of embedded bars 32 arranged in the reinforcing steel bar meshes 31 and a concrete layer 33 arranged on the reinforcing steel bar meshes 31, so that the problems of collapse and the like caused by insufficient structural strength in the filling process of the light filling body of the tunnel are prevented, and the construction safety and operability are ensured;
the method comprises the steps that a cavity 1 is higher than 130cm, a skylight opening 2 is formed below the cavity 1 in a tunnel lining, after the skylight opening 2 is opened, PE balls 4 are manually bound through reinforcing steel bars and prefabricated into an arch to serve as a first layer, the PE balls 4 are stacked on the top until the top of the cavity 1 is filled, the PE balls 4 are prefabricated into the arch at the bottom side to serve as the first layer during filling, and then light filling bodies are stacked on the top until the top of the cavity is filled.
(S3): the lining skylight 2 is implanted with the annular reinforcing steel bars and sprayed with concrete to seal the skylight 2 of the tunnel lining, when the height of the cavity 1 is larger than 160cm, layered grouting with not less than three times of grouting is carried out in the cavity 1 through the grouting pipe 7, the later layer of cement paste needs to be re-poured after the former layer reaches certain strength during layered grouting, and the later layer of cement paste needs to be re-poured after the former layer meets the structural strength during layered grouting.
According to the invention, after a constructor detects a cavity 1 area existing at the back of the secondary lining of the tunnel, a window communicated with the cavity 1, namely a skylight is opened at the secondary lining position below the cavity 1. The skylight is opened according to the specification size of the cavity 1, different light filling bodies are selected and used, the cavity of the cavity 1 is filled, reinforcing steel bars are implanted into the skylight window 2 of the secondary lining, concrete is sprayed to the skylight window 2 in a grid-connected mode to close the skylight window 2, finally, gaps among the light filling bodies are filled through grouting pipes 7 in a layered grouting mode, the thickness of the two linings is guaranteed to meet the road passing specification and design requirements, and the tunnel can be operated normally in the whole service life. The method utilizes the residual performance of the existing lining structure to quickly and effectively repair the cracked area of the structure, and the renovation construction method and the technology have stronger safety and operability, and are safe, practical, reliable in quality, economical and reasonable.
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 above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A method for renovating a large cavity behind a support of an operating tunnel is characterized by sequentially comprising the following steps:
(S1): inspecting the tunnel, determining the position and scale of a cavity behind a lining of an arch part of the tunnel, and selecting a corresponding renovation scheme according to different scales of the cavity;
(S2): a skylight opening is arranged on the lower tunnel lining positioned in the hollow space range, and then a light filler is filled into the hollow space through the skylight opening:
(S2-1): when the height of the cavity is less than or equal to 60cm, directly filling the cavity of the cavity by adopting drilling grouting without opening a skylight;
(S2-2): when the height of the cavity is more than 60cm and less than or equal to 130cm, filling the cavity of the cavity with a PE ball with the diameter of 10-20 cm;
(S2-3): when the cavity is higher than 130cm, filling a light filling body by adopting a PE ball, a foam concrete block or a PVC pipe with the diameter of 10-20 cm;
(S3): and closing a skylight opening of the tunnel lining and performing layered grouting into the cavity through a grouting system.
2. The method as claimed in claim 1, wherein in the step (S2), when the thickness of the tunnel lining is less than 70% of the designed thickness, the structural reinforcement group is implanted at the clearance side of the tunnel for structural reinforcement when the height of the cavity is less than or equal to 130cm, and the structural reinforcement group is applied at the outer side of the lining (bottom of the cavity) when the height of the cavity is greater than 130cm, so as to reinforce the thickness of the tunnel lining to the original designed thickness.
3. The renovation method for large cavities behind the back of a tunnel support according to claim 1, wherein the structure reinforcing group comprises reinforcing steel bar nets which are arranged at the cavities and lined inside and/or outside, a plurality of groups of planting bars arranged in the reinforcing steel bar nets and a concrete layer arranged on the reinforcing steel bar nets.
4. The renovation method for the large cavity behind the back of the operation tunnel support according to the claim 1, characterized in that, in the step (S3), when the height of the cavity is less than or equal to 160cm, grouting is carried out twice; and grouting for at least three times when the height of the hollow is more than 160 cm.
5. The method for renovating a large cavity behind a support of an operation tunnel according to claim 1, wherein the grouting in layers is performed after the former layer meets the structural strength, and then the later layer of cement paste is grouted.
6. The renovation method for operating a large cavity behind a tunnel support according to claim 1, wherein the step (S3) of closing the skylight opening comprises implanting a ring, longitudinal steel bars and shotcrete wrapping the steel bars into the lining skylight opening.
7. The renovation method for operating large cavities behind tunnel supports according to claim 1, characterized in that the tunnel inspection in the step (S1) is geological radar detection or drilling investigation.
8. The renovation method for the large cavity behind the support of the operation tunnel according to the claim 1, characterized in that the light weight filling body is filled in the step (S2), the bottom side of the light weight filling body is prefabricated into an arch shape as the first layer, and then the light weight filling body is piled up until the top of the cavity is filled.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111894630A (en) * | 2020-06-16 | 2020-11-06 | 神华包神铁路集团有限责任公司 | Clearing structure and treatment method for tunnel brake tip defect |
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