CN112901205A - Soft rock large-span tunnel double-layer superposed lining support removing method and structure - Google Patents
Soft rock large-span tunnel double-layer superposed lining support removing method and structure Download PDFInfo
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- CN112901205A CN112901205A CN202110274315.5A CN202110274315A CN112901205A CN 112901205 A CN112901205 A CN 112901205A CN 202110274315 A CN202110274315 A CN 202110274315A CN 112901205 A CN112901205 A CN 112901205A
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000011435 rock Substances 0.000 title claims abstract description 23
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 67
- 239000010959 steel Substances 0.000 claims abstract description 67
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 17
- 239000004746 geotextile Substances 0.000 claims abstract description 13
- 238000013461 design Methods 0.000 claims abstract description 11
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 8
- 239000011083 cement mortar Substances 0.000 claims abstract description 7
- 238000005507 spraying Methods 0.000 claims abstract description 4
- 238000003466 welding Methods 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000003292 glue Substances 0.000 claims description 11
- 239000011248 coating agent Substances 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 10
- 238000000465 moulding Methods 0.000 claims description 9
- 239000004033 plastic Substances 0.000 claims description 9
- 238000005452 bending Methods 0.000 claims description 7
- 238000005192 partition Methods 0.000 claims description 7
- 239000000853 adhesive Substances 0.000 claims description 6
- 230000001070 adhesive effect Effects 0.000 claims description 6
- 239000003822 epoxy resin Substances 0.000 claims description 6
- 229920000647 polyepoxide Polymers 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- 239000012943 hotmelt Substances 0.000 claims description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 239000000565 sealant Substances 0.000 claims description 3
- 239000003973 paint Substances 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 33
- 230000008901 benefit Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 description 5
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- 238000010586 diagram Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- 239000002689 soil Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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
- E21D11/003—Linings or provisions thereon, specially adapted for traffic tunnels, e.g. with built-in cleaning devices
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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
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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
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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
- E21D11/14—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
-
- 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
- E21D11/14—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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- 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
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (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 provides a soft rock large-span tunnel double-layer superposed lining support removing method and a structure, wherein the method comprises the following steps: leveling a primary support base surface, mechanically breaking a steel bar mesh sheet of the intermediate wall, spraying wet concrete and dismantling part of the section steel support; sequentially laying a geotextile buffer layer and a waterproof layer close to the primary support base surface, and performing waterproof treatment on the temporarily reserved embedded support nodes supported by the profile steel; erecting a template project and binding reinforcing steel bars on the inner side of the primary support, and building an outer-layer secondary lining; removing the profile steel support and the outer layer secondary lining template engineering after the outer layer secondary lining reaches the design strength; cement mortar is adopted to trowel the base surface of the buried support node, and a waterproof reinforcing layer is laid on the outer layer second lining base surface; and erecting a template project and binding reinforcing steel bars on the inner sides of the outer two linings, building the inner two linings in a mold, and removing the inner two lining template project after the inner two linings reach the strength required by the design. The invention can effectively avoid the risk of support dismantling construction, can improve the integral waterproof quality of the lining, and has more obvious engineering, economic and social benefits.
Description
Technical Field
The invention belongs to the technical field of municipal underground engineering design and construction, and particularly relates to a soft rock long-span tunnel double-layer superposed lining support removing method and structure.
Background
When a tunnel with large underground excavation span is built and meets adverse geological environment or surrounding complex construction environment, in order to ensure engineering safety and controllable risk during excavation, construction methods such as a CRD method and a double-side-wall pit guiding method are adopted, wherein the whole part is divided into small parts, and the blocks are excavated, a 'jumping cabin method' is adopted for segmenting, partition dismantling temporary supports, laying waterproof, binding reinforcing steel bars and building a secondary permanent lining after a certain distance is formed or after the tunnel faces of the following guide pits are completely penetrated, the dismantling support step pitch and the sequence are severely restricted by geological conditions, the maximum allowable safe dismantling support step pitch needs to be adjusted and optimized according to monitoring data, and when the surrounding complex environment is sensitive to stratum deformation, the dismantling single support step pitch can be further restricted, and the construction efficiency and progress are seriously influenced.
The balance state of the original surrounding rock-support common bearing system is broken through in the moment of support removal construction, if the support removal scheme is reasonably and reliably designed, the residual bearing system can reach a new balance state through self internal force adjustment and deformation coordination, and safe and smooth support removal and lining molding can be ensured; if the design scheme of the support removal is selected improperly, the residual bearing system cannot be reasonably transferred or deformed to yield to a new balance state through the internal force of the residual bearing system, local or overall instability damage caused by insufficient primary support strength and rigidity occurs, the existing support removal technical scheme has to be corrected and re-demonstrated, and the following two correction schemes are usually adopted:
the first scheme is as follows: the distance between the compartments is increased, the support dismantling step pitch is reduced, the purposes of enhancing the space shed protection effect of a residual support system and reducing the mutual interference degree of the adjacent support dismantling step pitches are achieved, the span reducing effect of the inner support is replaced by the primary support space shed protection effect is fully exerted, and the smooth and safe operation of support dismantling construction is ensured.
Scheme II: and (3) firstly molding a guide pit and lining to the position near the existing temporary support node, additionally arranging a temporary support beside the node to replace the span reduction function of the support, then dismantling the existing temporary support and finishing the molding of the corresponding guide pit and lining, and circulating the steps until the full-ring lining is closed, wherein the closed-loop position needs to avoid the positions with high vault bending moment and shearing force.
Although the above two support dismantling technical schemes can effectively overcome and avoid the engineering risk caused by support dismantling construction to a certain extent, the following disadvantages and shortcomings are also existed:
the first scheme is as follows: a, the single support dismantling step is short (generally less than 6m or less), the construction efficiency is low, the construction period is long, and the engineering economy is poor; b, waterproof construction joints are increased, mainly circular seams, the waterproof cost is increased, and the waterproof quality is difficult to ensure; c, simultaneously building the intersection structures of the main tunnel and the branch tunnels in a molding mode, wherein the support removing step distance is seriously limited by the sizes of the branch tunnels and is difficult to adjust; d, when the support dismantling step distance is smaller than the minimum lining building length allowed by normal construction organization, the construction operability is extremely poor and even the construction can not be carried out.
Scheme II: a, the support replacement process is complex, the construction organization is difficult, the construction period is long, and the engineering economy is poor; b, newly-added temporary supports are waste engineering quantities, the tasks of early erection and later dismantling are heavy, and the engineering investment is increased sharply; c, waterproof construction joints are increased, mainly longitudinal joints, and the longitudinal joints basically cannot avoid weak stress positions such as bending moment and shearing force, so that the stress and waterproof quality of the permanent lining are not guaranteed; d, the existing waterproof materials and finished concrete near the node are easily damaged in the support dismantling construction.
In order to ensure controllable construction risk of stripping and shoring the soft rock large-span tunnel under unfavorable geology or complex surrounding environment conditions, the technical scheme of stripping and shoring the double-layer superposed lining formed by dividing the original two-lining structure into two parts according to the thickness is provided on the premise of not reducing the construction efficiency and not causing additional engineering investment increase.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method and a structure for stripping and bracing a double-layer overlapped lining of a soft rock large-span tunnel, which can effectively avoid the risk of stripping and bracing construction, improve the integral waterproof quality of the lining and have more obvious engineering, economic and social benefits.
In order to achieve the above purpose, the embodiment of the present invention adopts the following technical solutions:
in a first aspect, an embodiment of the present invention provides a soft rock long-span tunnel double-layer laminated lining support removing method, including the following steps:
step S1, leveling a primary support base surface, grouting and plugging water to a waterproof acceptance standard, mechanically breaking a steel bar mesh of the intermediate wall, spraying wet concrete and removing part of section steel supports;
step S2, removing the foreign matters such as the attachments, dirt, rust and the like on the support surface of the section steel which are temporarily reserved; sequentially laying a geotextile buffer layer and a waterproof layer close to the primary support base surface, and performing waterproof treatment on the temporarily reserved embedded support nodes (corresponding to the embedded support nodes in the outer layer secondary lining to be applied);
step S3, erecting an outer layer two-lining template project and binding reinforcing steel bars on the inner side of the primary support, and molding an outer layer two-lining;
step S4, after the outer layer second lining reaches the design strength, removing the section steel support and the outer layer second lining template project;
step S5, leveling the base surface of the embedded support node on the outer layer two lining by adopting cement mortar, and paving a waterproof reinforcing layer tightly attached to the base surface of the outer layer two lining;
and step S6, erecting an inner layer two-lining template project and binding reinforcing steel bars on the inner sides of the outer layer two linings, building an inner layer two lining, and removing the inner layer two-lining template project after the inner layer two lining reaches the strength required by the design.
Preferably, in step S1, a part of the steel section support is removed by jump-stripping and trial-stripping, and the whole steel section support is strictly kept so as not to form longitudinally-distributed embedded support nodes to weaken the structural strength and durability of the outer secondary lining.
Preferably, the section steel support is embedded in the outer-layer secondary lining, the section steel support is removed before the waterproof reinforcing layer is laid, and cement mortar is adopted to level the base surface of the embedded support node on the outer-layer secondary lining after the section steel support is removed.
Preferably, in step S2:
1) fixing the geotextile buffer layer on the primary support base surface, and tightly attaching the plastic round gasket to the geotextile buffer layer by adopting a shooting nail;
2) welding the waterproof layer on the plastic round gasket by utilizing hot-air welding gun hot-melt welding, wherein the waterproof layer is subjected to 90-degree bending treatment at the embedded support node of the section steel support, and the bending direction is along the longitudinal direction of the section steel support and faces towards the inner side;
3) coating double-sided adhesive glue on the embedded support node of the profile steel support, pressing and bonding the waterproof layer folded at 90 degrees on the embedded support node of the profile steel support, and additionally arranging an L-shaped reinforced waterproof layer at the corner of the outer side of the waterproof layer;
4) arranging a first path of the water-swelling water-stop glue at the tail end of the waterproof layer as a closing waterproof reinforcing measure, and arranging a second path at a certain distance as waterproof storage;
5) firmly connecting an E-shaped water stop steel plate with the profile steel support in a welding mode below the water-swelling water stop glue, and brushing the sealant along a welding line to block potential holes and crack flaws; the shape of the section steel support cross section is matched with that of the E-shaped water stop steel plate.
Preferably, the epoxy resin coating is coated on the support surface of the section steel, and the epoxy resin coating has the excellent characteristics of small deformation shrinkage, good flexibility and high bonding strength.
Preferably, the outer secondary lining serves as a load-bearing structure for both the temporary bracing stage and the normal use stage, and is designed in consideration of strength, rigidity and durability according to a permanent structure.
Preferably, the reinforced waterproof layer is arranged between the outer-layer secondary lining and the inner-layer secondary lining and is laid after the section steel support is removed.
Preferably, the thickness ratio of the outer layer second lining to the inner layer second lining is slightly larger than 1, and the thickness of the outer layer second lining is 50-100 mm larger than that of the inner layer second lining.
Preferably, the waterproof layer and the waterproof reinforcing layer are one or a combination of two or three of a waterproof coiled material, a waterproof coating and a plastic waterproof board.
In a second aspect, the invention also provides a double-layer superposed lining structure of the soft rock large-span tunnel after being disassembled and supported according to the method for disassembling and supporting the double-layer superposed lining of the soft rock large-span tunnel, which comprises a primary support, a waterproof layer, an outer-layer secondary lining, a reinforced waterproof layer and an inner-layer secondary lining; wherein, the inner side of the primary support is provided with an outer layer secondary lining, and the inner side of the outer layer secondary lining is provided with an inner layer secondary lining; the waterproof layer is laid between the primary support structure and the outer-layer secondary lining, and a geotextile buffer layer is laid between the primary support structure and the waterproof layer; and a reinforced waterproof layer is laid between the outer-layer secondary lining and the inner-layer secondary lining.
The invention has the following beneficial effects:
the invention provides a double-layer superposed lining support removing method and a double-layer superposed lining support removing structure for a soft rock large-span tunnel.A second outer lining and a second inner lining are sequentially molded on the inner side of a primary support, a waterproof reinforcing layer is additionally arranged between the second outer lining and the second inner lining, wherein the second outer lining is applied before the section steel support is removed, and a superposed 'reinforced' bearing system formed by the primary support and the second outer lining jointly maintains the stability of the large-span structure after support removing; the inner layer two linings are constructed after the section steel supports are removed, and form a superposed lining together with the outer layer two linings to bear the water and soil pressure load in the normal use stage, so that the construction risk of support removal can be effectively avoided, the integral waterproof quality of the lining can be improved, the total thickness of the superposed lining is basically the same as the thickness of the original two lining structure, and the engineering, economic and social benefits are more obvious.
The invention can completely control the construction risk of support removal, reduce the engineering risk pressure and does not increase additional engineering investment; the support dismantling step distance is not limited by the size of the branch holes at the intersection, and the lining molding operation is more flexible; and the leakage of underground water is blocked by means of two waterproof setups, so that the overall waterproof quality and effect of the lining are improved; meanwhile, the adaptability of the support dismantling construction to adverse geological conditions and complex surrounding environment is widened; the method has the advantages of convenient construction organization, construction speed acceleration, engineering investment saving and construction period saving.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a diagram of a construction method for double-layer overlapping lining demolishing of a soft rock large-span tunnel according to an embodiment of the present invention;
FIG. 2 is a transverse arrangement diagram of the embedded support waterproof node of the section steel support according to the embodiment of the invention.
Description of reference numerals:
1. primary support; 2. supporting the section steel; 3. a waterproof layer; an L-shaped waterproof reinforcing layer; 32. double-sided adhesive glue; 33. an epoxy resin coating; 34. water-swellable water-stop glue; 35. for the E-shaped water stop steel plate; 36. sealing glue; 4. an outer layer two lining; 5. reinforcing the waterproof layer; 6. an inner layer two lining; 7. geotechnical cloth buffer layer.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The embodiment provides a soft rock long-span tunnel double-layer laminated lining support removing method, as shown in fig. 1 and fig. 2, the method includes the following steps:
and step S1, leveling the primary support 1 base surface, grouting and plugging water to the waterproof acceptance standard, mechanically breaking the reinforcing mesh sheets of the intermediate wall, spraying wet concrete and removing part of the section steel supports.
Step S2, removing the foreign matters such as the attachments, dirt, rust and the like on the surface of the section steel support 2 which are temporarily reserved; and sequentially paving a geotextile buffer layer 7 and a waterproof layer 3 close to the base surface of the primary support 1, and performing waterproof treatment on the temporarily reserved embedded support nodes of the section steel support 2 (corresponding to the embedded support nodes in the outer layer secondary lining to be applied).
And step S3, erecting an outer layer two-lining template project and binding reinforcing steel bars on the inner side of the primary support 1, and molding an outer layer two-lining 4.
And step S4, after the outer layer two-lining 4 reaches the design strength, removing the section steel support 2 and the outer layer two-lining template project.
And step S5, leveling the base surface of the embedded support node on the outer layer two lining 4 by adopting cement mortar, and paving a waterproof reinforcing layer 5 tightly attached to the base surface of the outer layer two lining 4.
And step S6, erecting an inner layer two-lining template project and binding reinforcing steel bars on the inner side of the outer layer two-lining 4, building an inner layer two-lining 6, and removing the inner layer two-lining template project after the inner layer two-lining 6 reaches the strength required by the design.
Further, in step S1, a part of the section steel support is removed by using a jump-detaching and trial-detaching manner, and the whole section steel support is strictly kept so as not to form longitudinally dense embedded support nodes to weaken the structural strength and durability of the outer layer secondary lining 4, and the section steel support 2 can be embedded at one partition and one partition, or embedded at three partitions and the like, in this embodiment, the embedded support nodes of the section steel support 2 are reserved at two partitions and one partition.
Furthermore, the section steel support 2 is embedded in the outer-layer secondary lining 4, the section steel support 2 is removed before the waterproof reinforcing layer 5 is laid, and after removal, cement mortar is adopted to trowel the base surface of the embedded support node on the outer-layer secondary lining 4.
Further, as shown in fig. 2, in step S2:
1) and fixing the geotextile buffer layer 7 on the primary support 1 base surface, and tightly attaching the plastic round gasket to the geotextile buffer layer 7 by adopting a shooting nail.
2) And welding the waterproof layer 3 on the plastic round gasket by utilizing hot-air welding gun hot-melt welding, wherein the waterproof layer 3 is subjected to 90-degree bending treatment at the embedded support node of the profile steel support 2, and the bending direction is along the longitudinal direction of the profile steel support 2 and faces towards the inner side.
3) And (2) coating double-sided adhesive glue 32 on the embedded support node of the profile steel support 2, pressing and bonding the waterproof layer 3 folded at 90 degrees on the embedded support node of the profile steel support 2, and additionally arranging an L-shaped reinforced waterproof layer 31 at the outer corner of the waterproof layer 3.
4) The first path of the water-swelling water-stop glue 34 is arranged at the tail end of the waterproof layer to serve as a closing-in waterproof reinforcing measure, and the second path of the water-swelling water-stop glue is arranged at a certain distance to serve as waterproof storage.
5) Under the water-swelling water-stopping adhesive 34, firmly connecting an E-shaped water-stopping steel plate 35 with the section steel support 2 in a welding mode, and brushing the sealant 36 along a welding line to block potential holes and crack flaws; the pair of E-shaped water stop steel plates 35 is matched with the cross section shape of the section steel support 2.
Furthermore, an epoxy resin coating 33 is coated on the surface of the section steel support 2, and the epoxy resin coating has the excellent characteristics of small deformation shrinkage, good flexibility and high bonding strength.
Further, the outer secondary lining 4 is used as a bearing structure in a temporary support-dismantling stage and a normal use stage, and is designed according to a permanent structure in consideration of strength, rigidity and durability, the concrete grade is C45, and the impermeability grade is P12.
Further, the reinforced waterproof layer 5 is arranged between the outer-layer second lining 4 and the inner-layer second lining 6, and is laid after the section steel support 2 is removed.
Further, the thickness of the outer layer second lining 4 is 50-100 mm larger than that of the inner layer second lining 6; in the embodiment, the ratio of the thickness of the outer layer two linings 4 to the thickness of the inner layer two linings 6 is 1.25, and the thickness of the outer layer two linings 4 is 100mm larger than that of the inner layer two linings 6.
Further, the waterproof layer 3 and the waterproof reinforcing layer 5 may be one or a combination of two or more of materials such as waterproof roll, waterproof paint or plastic waterproof board.
The embodiment also provides a double-layer superposed lining structure of the soft rock large-span tunnel after the support is removed according to the support removing method, which comprises a primary support 1, a waterproof layer 3, an outer-layer secondary lining 4, a reinforced waterproof layer 5 and an inner-layer secondary lining 6; wherein, the inner side of the primary support 1 is provided with an outer layer secondary lining 4, and the inner side of the outer layer secondary lining 4 is provided with an inner layer secondary lining 6; the waterproof layer 3 is laid between the primary support structure 1 and the outer secondary lining 4, and a geotextile buffer layer 7 is laid between the primary support structure 1 and the waterproof layer 3; and a reinforced waterproof layer 5 is laid between the outer layer secondary lining 4 and the inner layer secondary lining 6.
According to the technical scheme, the soft rock large-span tunnel double-layer superposed lining support dismantling method and structure provided by the embodiment have the advantages that the support dismantling construction risk is completely controllable, the engineering risk pressure is reduced, and no additional engineering investment is increased; the support dismantling step distance is not limited by the size of the branch holes at the intersection, and the lining molding operation is more flexible; and the leakage of underground water is blocked by means of two waterproof setups, so that the overall waterproof quality and effect of the lining are improved; meanwhile, the adaptability of the support dismantling construction to adverse geological conditions and complex surrounding environment is widened; the method has the advantages of convenient construction organization, construction speed acceleration, engineering investment saving and construction period saving.
The embodiments of the present invention have been described in detail through the embodiments, but the description is only exemplary of the embodiments of the present invention and should not be construed as limiting the scope of the embodiments of the present invention. The scope of protection of the embodiments of the invention is defined by the claims. In the present invention, the technical solutions described in the embodiments of the present invention or those skilled in the art, based on the teachings of the embodiments of the present invention, design similar technical solutions to achieve the above technical effects within the spirit and the protection scope of the embodiments of the present invention, or equivalent changes and modifications made to the application scope, etc., should still fall within the protection scope covered by the patent of the embodiments of the present invention.
Claims (9)
1. A soft rock large-span tunnel double-layer superposed lining support removing method is characterized by comprising the following steps:
step S1, leveling the primary support (1) base surface, grouting and plugging water to the waterproof acceptance standard, mechanically breaking the mid-partition steel bar mesh, spraying wet concrete and removing part of section steel supports;
step S2, removing the temporarily remained foreign matters such as attachments, dirt and rust on the surface of the section steel support (2); sequentially laying a geotextile buffer layer (7) and a waterproof layer (3) close to the base surface of the primary support (1), and performing waterproof treatment on the temporarily reserved embedded support nodes of the profile steel support (2);
step S3, erecting an outer layer two-lining template project and binding reinforcing steel bars on the inner side of the primary support (1), and molding an outer layer two-lining (4);
step S4, after the outer layer secondary lining (4) reaches the design strength, dismantling the section steel support (2) and the outer layer secondary lining template project;
step S5, cement mortar is adopted to trowel the base surface of the embedded support node on the outer layer secondary lining (4), and a waterproof reinforcing layer (5) is laid close to the base surface of the outer layer secondary lining (4);
and S6, erecting an inner layer two-lining template project and binding steel bars on the inner side of the outer layer two-lining (4), building an inner layer two-lining (6), and removing the inner layer two-lining template project after the inner layer two-lining (6) reaches the strength required by the design.
2. The soft rock long-span tunnel double-layer laminated lining support removing method according to claim 1, wherein in step S1, part of the section steel support is removed in a jump-dismantling and trial-dismantling manner.
3. The soft rock long-span tunnel double-layer laminated lining support removing method according to claim 1, characterized in that the section steel supports (2) are embedded inside the outer-layer two linings (4), the section steel supports (2) are removed before the waterproof reinforcing layer (5) is laid, and after the removal, cement mortar is adopted to level up the embedded support node base surfaces on the outer-layer two linings (4).
4. The soft rock long-span tunnel double-layer laminated lining support removing method according to claim 1, wherein in step S2:
1) fixing the geotextile buffer layer (7) on the primary support (1) base surface, and tightly attaching the plastic round gasket to the geotextile buffer layer (7) by adopting a shooting nail;
2) welding the waterproof layer (3) on the plastic round gasket by utilizing hot-air welding gun hot-melt welding, wherein the waterproof layer (3) is bent at the embedded support node of the profile steel support (2) by 90 degrees, and the bending direction is along the longitudinal direction of the profile steel support (2) and faces towards the inner side;
3) coating double-sided adhesive glue (32) on the embedded support node of the section steel support (2), pressing and bonding the waterproof layer (3) folded at 90 degrees on the embedded support node of the section steel support (2), and additionally arranging an L-shaped reinforced waterproof layer (31) at the outer corner of the waterproof layer (3);
4) arranging a first path of the water-swelling water-stop glue (34) at the tail end of the waterproof layer as a closing-up waterproof reinforcing measure, and arranging a second path at a certain distance as a waterproof reserve;
5) under the water-swelling water-stopping adhesive (34), an E-shaped water-stopping steel plate (35) is firmly connected with the section steel support (2) in a welding mode, and the sealant (36) is coated along a welding seam to block potential holes and crack flaws; the pair of E-shaped water stop steel plates (35) is matched with the cross section shape of the section steel support (2).
5. The soft rock long-span tunnel double-layer laminated lining demolishing method according to claim 4, characterized in that the surface of the section steel support (2) is painted with an epoxy resin coating (33).
6. The soft rock long-span tunnel double-layer overlapped lining support dismantling method according to claim 1, characterized in that the reinforced waterproof layer (5) is arranged between the outer-layer second lining (4) and the inner-layer second lining (6) and laid after the section steel support (2) is dismantled.
7. The soft rock long-span tunnel double-layer laminated lining support removing method according to claim 1, wherein the thickness of the outer-layer second lining (4) is 50-100 mm larger than that of the inner-layer second lining (6).
8. The soft rock long-span tunnel double-layer overlapped lining support dismantling method as claimed in claim 1, wherein the waterproof layer (3) and the waterproof reinforcing layer (5) are one or a combination of two or three of waterproof coiled materials, waterproof paint and plastic waterproof boards.
9. The double-layer superposed lining structure of the soft rock large-span tunnel after being disassembled and supported according to the method of any one of claims 1 to 8, which is characterized by comprising a primary support (1), a waterproof layer (3), an outer layer secondary lining (4), a reinforced waterproof layer (5) and an inner layer secondary lining (6); wherein, the inner side of the primary support (1) is provided with an outer layer secondary lining (4), and the inner side of the outer layer secondary lining (4) is provided with an inner layer secondary lining (6); the waterproof layer (3) is laid between the primary support structure (1) and the outer-layer secondary lining (4), and a geotextile buffer layer (7) is laid between the primary support structure (1) and the waterproof layer (3); and a reinforced waterproof layer (5) is laid between the outer layer secondary lining (4) and the inner layer secondary lining (6).
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