CN115306428A - Safe and rapid construction method suitable for tunnel secondary lining of double-side-wall pit guiding method - Google Patents
Safe and rapid construction method suitable for tunnel secondary lining of double-side-wall pit guiding method Download PDFInfo
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- CN115306428A CN115306428A CN202211070649.1A CN202211070649A CN115306428A CN 115306428 A CN115306428 A CN 115306428A CN 202211070649 A CN202211070649 A CN 202211070649A CN 115306428 A CN115306428 A CN 115306428A
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- 238000010276 construction Methods 0.000 title claims abstract description 117
- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000004567 concrete Substances 0.000 claims abstract description 28
- 229910000831 Steel Inorganic materials 0.000 claims description 70
- 239000010959 steel Substances 0.000 claims description 70
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 30
- 238000004140 cleaning Methods 0.000 claims description 19
- 238000005520 cutting process Methods 0.000 claims description 17
- 239000011378 shotcrete Substances 0.000 claims description 10
- 239000007921 spray Substances 0.000 claims description 7
- 239000003292 glue Substances 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 4
- 230000002265 prevention Effects 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 239000003344 environmental pollutant Substances 0.000 claims description 3
- 231100000719 pollutant Toxicity 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 238000007788 roughening Methods 0.000 claims description 3
- 229910000746 Structural steel Inorganic materials 0.000 claims 1
- 238000009415 formwork Methods 0.000 claims 1
- 230000035515 penetration Effects 0.000 abstract 1
- 238000009412 basement excavation Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007363 ring formation reaction Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000004078 waterproofing Methods 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
- E21D11/006—Lining anchored in the rock
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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
- E21D11/04—Lining with building materials
- E21D11/12—Temporary supports for use during building; Accessories
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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
- 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
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
- 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
A safe and rapid construction method suitable for a double-side-wall pit-guide method tunnel secondary lining is used for the whole secondary lining construction, the influence of temporary structure dismantling on a primary support structure is reduced by reserving most temporary structures (temporary vertical supports and temporary transverse supports), and the pouring of a secondary lining long section is realized; after the second lining construction is finished, the temporary structure is dismantled, the construction process is effectively simplified, and secondary disturbance to the surrounding environment is reduced on the premise of ensuring the safety of the underground excavated tunnel; after the construction of the inverted arch second lining and the inverted arch backfilling concrete is completed, the template supports are independently and synchronously erected through the reserved temporary structures of the pilot holes, large holes are changed into small holes, the overall construction difficulty of a template support system is greatly reduced, the once pouring of the arch waist and arch top second lining is realized, and the overall construction efficiency of the second lining is improved. The invention has the advantages of mature process and simple and convenient operation, and has very important reference value and practical significance for the engineering construction of similar mine method tunnels in sensitive environments, especially the short-distance penetration of existing lines, important pipelines, building structures and the like.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to a safe and rapid tunnel secondary lining construction method suitable for a double-side-wall pit guiding method.
Background
The excavation method of the double-side-wall pit guiding method is generally applied to underground excavation tunnel engineering with poor surrounding rocks, large section, shallow buried depth, complex surrounding environment and high requirement on settlement control, the construction condition that existing buildings (structures) penetrate under a tunnel is often met, and the conventional measures mainly comprise the steps of strengthening advanced support, enhancing the primary support strength of an excavated tunnel, accelerating primary support ring formation and the like and are all unfolded around the tunnel excavation construction. And interim erections, interim stull etc. need demolish at two lining construction stages as interim structures, are a high risk operation, easily lead to the tunnel first prop to warp too big or even collapse. At present, most of conventional temporary support dismantling methods are implemented by dismantling a full section of an inverted arch after secondary lining is completed and before secondary lining construction of side walls and arch parts, so that not only can the primary support deformation of a tunnel be reliably controlled, but also the large section brings many problems such as construction technology and progress of a secondary lining template support system, the secondary lining construction period is prolonged, the deformation of the tunnel structure and the management and control of construction safety are unfavorable, and the safety of the tunnel and the safety of surrounding building structures can be seriously influenced. Therefore, how to complete the second lining construction safely, reliably, quickly and with low disturbance in tunnel construction, especially the construction of passing the existing operating line under a large-section underground tunnel in a sensitive environment of a city, is undoubtedly a great technical problem to be solved urgently.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a safe and rapid construction method for a secondary lining of a tunnel by a double-side-wall pit guiding method, the whole secondary lining construction is carried out, the influence of temporary structure dismantling on a primary support structure is reduced by reserving most temporary structures (temporary vertical braces and temporary transverse braces), and the long-section pouring of the secondary lining is realized; after the second lining construction is finished, the temporary structure is dismantled, the construction process is effectively simplified, and secondary disturbance to the surrounding environment is reduced on the premise of ensuring the safety of the underground excavated tunnel; after the construction of the inverted arch second lining and the inverted arch backfilling concrete is completed, the template supports are independently and synchronously erected through the reserved temporary structures of the pilot holes, large holes are changed into small holes, the overall construction difficulty of a template support system is greatly reduced, the once pouring of the arch waist and arch top second lining is realized, and the overall construction efficiency of the second lining is improved.
In order to achieve the purpose, the invention adopts the technical scheme that:
a safe and rapid construction method suitable for a tunnel secondary lining by a double-side-wall pit guiding method comprises the following steps:
1) After primary support of the underground tunnel is closed to form a ring, primary support deformation is stable and cleaning in a tunnel is finished, measuring and discharging an elevation control line of inverted arch backfill concrete, and manually chiseling temporary vertical supports (2), secondary inverted arch linings (4) and primary support spray concrete within the range of inverted arch backfill (5);
2) An information construction means is adopted, one construction length of an inverted arch secondary lining is combined, one construction section of an inverted arch secondary lining (4) is dismantled at intervals of one or every two, the section steel of the temporary vertical support (2) within the range of the inverted arch backfilling (5) is dismantled at intervals of one or every two, and the remaining section steel of the temporary vertical support (2) is subjected to detailed water prevention and water stop measures;
3) Constructing the second inverted arch lining (4) for water prevention and steel bar installation to complete the construction of the second inverted arch lining (4); roughening and cleaning the base surface of the second lining of the inverted arch (4) to finish the concrete construction of the inverted arch backfilling (5);
4) All the lower pilot tunnels are synchronously erected with full-red scaffolds (8) on the same layer, after the full-red scaffolds (8) of the lower pilot tunnels are erected, an information construction means is adopted, the lengths of two lining construction sections are combined, one construction section temporary cross brace (3) in the range of a side wall two lining (7) is chiseled to spray concrete, the section steel of the temporary cross brace (3) is dismantled at intervals of one or two, and waterproof and water-stop measures are performed on the reserved section steel of the temporary cross brace (3);
5) All the upper pilot tunnels are simultaneously erected with full-hall red scaffolds (8) on the same layer, after the erection of the upper pilot tunnel full-hall red scaffolds (8) is completed, an information construction means is adopted, the length is divided by combining two lining construction sections, one construction section temporary vertical brace (2) in the range of an arch part second lining (6) is chiseled off, the section steel of the temporary vertical brace (2) is dismantled at intervals of one or two, and the remaining section steel of the temporary vertical brace (2) is subjected to waterproof and water-stop measures and detailed treatment;
6) The second side wall lining (7) and the second arch lining (6) are waterproof, steel bars are installed and constructed, a combined steel template is installed, and concrete pouring of the second lining is completed;
7) When the second lining concrete reaches the designed strength value, cutting off the remaining section steel of the temporary vertical support (2) close to the arch part second lining (6) by adopting an information construction means; dismantling and cleaning the full red scaffold (8) of the pilot tunnel on the construction section, and then continuously cutting and disconnecting the section steel of the residual temporary wale (3) close to the second lining (7) of the side wall; finally, the full-hall red scaffold (8) of each lower pilot tunnel is dismantled and cleaned;
8) And (3) by combining the site construction conditions, the large or lengthened arm gun machine is used for dismantling and cleaning the residual temporary vertical braces (2) and temporary transverse braces (3) from top to bottom, and the construction of the whole tunnel civil engineering is completed.
Further, during second-lining construction, most primary support temporary structures (temporary vertical supports and temporary transverse supports) are reserved as far as possible, the template supports are synchronously and independently erected by the aid of the temporary structures in each pilot tunnel, after the second-lining construction of the full section is completed, the second-lining template system and the residual temporary structures are dismantled, and the construction of the underground excavated tunnel is safely and quickly completed.
Further, before the second inverted arch lining (4) is constructed, the temporary vertical support (2) is chiseled off, the second inverted arch lining (4) and the primary support sprayed concrete in the range of the backfilling (5) of the inverted arch are chiseled off, and section steel in the range of the second inverted arch lining (4) and the backfilling (5) of the inverted arch are removed at intervals of one or two.
Further, after the construction of the second inverted arch lining (4) and the inverted arch backfilling (5) is completed, all the pilot tunnels are independently and synchronously erected with full red scaffolds (8), then the temporary vertical braces (2), the arch parts (6) of the temporary transverse braces (3) and the primary support of the second lining range of the side wall (7) are chiseled off to spray concrete, and the section steel of the arch parts (6) and the second lining range of the side wall (7) is removed at intervals of one or two.
Further, after the construction of the second arch part lining (6) and the second side wall lining (7) is completed, cutting off the section steel of the residual temporary vertical support (2) close to the second arch part lining (6); then, dismantling and cleaning each upper pilot tunnel full red scaffold (8), and continuously cutting and disconnecting the section steel of the residual temporary wale (3) close to the side wall secondary lining (7); and finishing the work of dismantling and cleaning the full-hall red scaffold (8) of each lower pilot tunnel, and finally finishing the dismantling and cleaning of the residual temporary vertical braces (2) and the residual temporary transverse braces (3).
Further, the primary support of the temporary vertical support (2) and the secondary inverted arch lining (4) are chiseled manually, the primary support of the concrete is backfilled within the range of (5), the once chiseling height is the elevation of the inverted arch backfilled concrete, the elevation plus is no more than 30cm, the reserved section steel cutting space is guaranteed, and the chiseling height is reduced as much as possible.
Furthermore, the detailed treatment of the waterproof and water-stopping measures of the section steel of the temporary vertical support (2) and the temporary transverse support (3) generally comprises the following construction procedures: shaped steel pollutant clearance, the stagnant water steel sheet welding of customization size, brush on water expansibility stagnant water glue to shaped steel stagnant water steel sheet welding seam, adopt water expansibility stagnant water glue to close up shaped steel root PVC waterproof board and paste one and meet water expansibility stagnant water strip, shaped steel root is executed and is done waterproof additional layer and close up fixedly.
Further, the primary support sprayed concrete in the range of the arch part secondary lining (6) and the side wall secondary lining (7) is chiseled manually, the primary chiseling height is more than or equal to 30cm higher than the thickness of the secondary lining, the reinforcing requirement of the secondary lining template and the reserved section steel cutting space are guaranteed, and the chiseling height and width are reduced as much as possible.
Furthermore, the rest temporary vertical supports (2) and the temporary cross supports (3) are dismantled, the general dismantling sequence is that the whole section is dismantled step by step from top to bottom, the upper pilot tunnel temporary vertical support, the temporary cross supports and the lower pilot tunnel temporary vertical support are orderly arranged, the longitudinal one-step subsection dismantling length is not too long, and the control is within 3m, so that the temporary cross supports are not accumulated above the temporary cross supports in the dismantling process of the upper pilot tunnel temporary vertical supports, and the dismantling of the temporary cross supports is further influenced; and circularly unfolding the next subsection dismantling construction after the subsection dismantling is finished.
Compared with the prior art, the invention has the following advantages:
the invention provides a safe and rapid construction method for a secondary lining of a tunnel by a double-side-wall pit guiding method, which is used for the whole secondary lining construction, reduces the influence of temporary structure dismantling on a primary support structure by keeping most temporary structures (temporary vertical braces and temporary transverse braces), and realizes the pouring of a long section of the secondary lining; after the second lining construction is finished, the temporary structure is dismantled, the construction process is effectively simplified, and secondary disturbance to the surrounding environment is reduced on the premise of ensuring the safety of the underground excavated tunnel; after the construction of the second inverted arch lining and the inverted arch backfilling concrete is finished, the template supports are independently and synchronously erected through the reserved temporary structures of the pilot tunnels, large holes are changed into small holes, the overall construction difficulty of a template support system is greatly reduced, the once pouring of the second arched waist lining and the second arched arch lining is realized, and the overall construction efficiency of the second lining is improved.
Drawings
FIG. 1 is a schematic view of a tunnel secondary lining construction process of the present invention.
Fig. 2 is a schematic view of the tunnel secondary lining construction process.
Wherein, in the figure: (1) -primary support structure; (2) -temporary vertical braces; (3) -a temporary wale; (4) -an inverted arch secondary lining; (5) -inverted arch backfill concrete; (6) -a crown secondary lining; (7) -a second side wall lining; (8) -full red scaffolding; a-temporary vertical bracing in the range of an inverted arch second lining and inverted arch backfill concrete; b-temporary cross bracing in the range of the second lining of the side wall; c-temporary vertical bracing in the second arch lining range.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in figures 1 and 2, the safe and rapid construction method for the secondary lining of the tunnel by the double-side-wall pit guiding method comprises a safe and rapid construction technology that most of primary supporting temporary structures (temporary vertical braces and temporary transverse braces) are reserved in the secondary lining construction process, template supports are synchronously and independently erected on each pilot tunnel by using the temporary structures, and the temporary structures are dismantled after the secondary lining construction is completed.
(1) Before the second inverted arch lining (4) is constructed, the temporary vertical support (2) is chiseled off, the second inverted arch lining (4) and the primary support sprayed concrete in the range of the backfilled inverted arch (5) are removed, and the section steel in the range of the second inverted arch lining (4) and the backfilled inverted arch (5) is removed at intervals of one section or two sections.
(2) After the construction of the second inverted arch lining (4) and the inverted arch backfilling (5) is completed, all pilot tunnels are independently and synchronously erected with full red scaffolds (8), then the temporary vertical braces (2), the temporary transverse braces (3), the arch parts (6) and the second side wall (7) are chiseled off, the primary support of the sprayed concrete is completed, and the section steel in the arch parts (6) and the second side wall (7) is removed at intervals of one or two.
(3) After the second arch part lining (6) and the second side wall lining (7) are constructed, cutting off the section steel of the residual temporary vertical support (2) close to the second arch part lining (6); then, dismantling and cleaning each upper pilot tunnel full red scaffold (8), and continuously cutting and disconnecting the section steel of the residual temporary wale (3) close to the side wall secondary lining (7); and finishing the work of dismantling and cleaning the full-hall red scaffold (8) of each lower pilot tunnel, and finally finishing the dismantling and cleaning of the residual temporary vertical braces (2) and the residual temporary transverse braces (3).
(4) A safe and rapid construction method suitable for a tunnel secondary lining by a double-side-wall pit guiding method is characterized by comprising the following steps:
1) And (3) after the primary support of the underground tunnel is closed to form a ring, the primary support is deformed stably and the inside of the tunnel is cleaned, measuring and discharging an elevation control line of the inverted arch backfill concrete, and manually chiseling the primary support spray concrete within the range of the temporary vertical support (2), the secondary inverted arch liner (4) and the inverted arch backfill (5).
2) And an information construction means is adopted, the construction length of the second inverted arch lining is combined, the second inverted arch lining (4) of one construction section is removed at intervals of one or every two, the section steel of the temporary vertical support (2) within the range of the backfilling (5) of the inverted arch is removed at intervals of one or every two, and the reserved section steel of the temporary vertical support (2) is subjected to detailed water prevention and water stop measures.
3) Constructing the second inverted arch lining (4) for waterproofing and installing reinforcing steel bars, and finishing the construction of the second inverted arch lining (4); and (4) roughening and cleaning the base surface of the second liner of the inverted arch (4) to finish the concrete construction of the inverted arch backfill (5).
4) All the lower pilot tunnels are synchronously erected with full-hall red scaffolds (8) on the same floor, after the full-hall red scaffolds (8) of the lower pilot tunnels are erected, an information construction means is adopted, the lengths of two lining construction sections are combined, one construction section temporary cross brace (3) in the range of a side wall two lining (7) is chiseled off to spray concrete, the section steel of the temporary cross brace (3) is dismantled at intervals of one or two, and waterproof and water-stop measures are performed on the reserved section steel of the temporary cross brace (3).
5) All the upper pilot tunnels are synchronously erected with full-hall red scaffolds (8) on the same layer, after the erection of the upper pilot tunnel full-hall red scaffolds (8) is completed, an information construction means is adopted, the length is divided by combining two lining construction sections, one construction section temporary vertical support (2) in the range of the second lining (6) of the arch part is chiseled off, the section steel of the temporary vertical support (2) is dismantled at intervals of one or two, and waterproof and water-stop measures are taken for the reserved section steel of the temporary vertical support (2) to be treated in detail.
6) And (3) waterproof of a second side wall lining (7) and a second arch part lining (6), steel bar installation construction, installation of a combined steel template and completion of casting of second lining concrete.
7) When the second lining concrete reaches the designed strength value, cutting off the remaining section steel of the temporary vertical support (2) close to the arch part second lining (6) by adopting an information construction means; dismantling and cleaning the full red scaffold (8) of the pilot tunnel on the construction section, and then continuously cutting and disconnecting the section steel of the residual temporary wale (3) close to the second lining (7) of the side wall; and finally, the work of dismantling and cleaning the full-hall red scaffolds (8) of each lower pilot tunnel is completed.
8) And (3) by combining the site construction conditions, the large or lengthened arm gun machine is adopted to dismantle and clean the residual temporary vertical braces (2) and temporary transverse braces (3) from top to bottom, and the whole tunnel civil engineering construction is completed.
(5) The method is characterized in that the primary support sprayed concrete is removed by manual chiseling of the secondary inverted arch lining (4) of the temporary vertical support (2) and the range of the backfilled inverted arch (5), the once chiseling height is the height mark plus not more than 30cm of the backfilled inverted arch concrete, the reserved section steel cutting space is guaranteed, and the chiseling height is reduced as much as possible.
(6) The detailed treatment of the waterproof and water-stop measures of the section steel of the temporary vertical support (2) and the temporary transverse support (3) generally comprises the following construction procedures: shaped steel pollutant clearance, the stagnant water steel sheet welding of customization size, brush on water expansibility stagnant water glue to shaped steel stagnant water steel sheet welding seam, adopt water expansibility stagnant water glue to close up shaped steel root PVC waterproof board and paste one and meet water expansibility stagnant water strip, shaped steel root is executed and is done waterproof additional layer and close up fixedly.
(7) The primary support sprayed concrete is removed within the range of the arch secondary lining (6) and the side wall secondary lining (7) through manual chiseling, the primary chiseling height is the thickness of the secondary lining + (more than or equal to 30 cm), the reinforcing requirement of the secondary lining template and the reserved section steel cutting space are guaranteed, and the chiseling height and the chiseling width are reduced as much as possible.
(8) The rest temporary vertical supports (2) and the temporary cross supports (3) are dismantled, the general dismantling sequence is that the whole section is dismantled step by step from top to bottom, the upper pilot tunnel temporary vertical support, the temporary cross supports and the lower pilot tunnel temporary vertical support are sequentially arranged, the longitudinal one-step subsection dismantling length is not suitable to be overlong, and the control is within 3m, so that the condition that the temporary cross supports are not overstocked above the temporary cross supports in the dismantling process of the upper pilot tunnel temporary vertical supports is ensured, and the dismantling of the temporary cross supports is further influenced; and circularly unfolding the next subsection dismantling construction after the subsection dismantling is finished.
Claims (9)
1. A safe and rapid construction method suitable for a tunnel secondary lining by a double-side-wall pit guiding method is characterized by comprising the following steps:
1) After primary support of the underground tunnel is closed to form a ring, primary support deformation is stable and cleaning in a tunnel is finished, measuring and discharging an elevation control line of inverted arch backfill concrete, and manually chiseling temporary vertical supports (2), secondary inverted arch linings (4) and primary support spray concrete within the range of inverted arch backfill (5);
2) An information construction means is adopted, one construction length of the second inverted arch lining is combined, one construction section of the second inverted arch lining (4) and the temporary vertical support (2) section steel within the range of the backfilling (5) of the inverted arch are removed at intervals of one or two, and the reserved temporary vertical support (2) section steel is subjected to detailed treatment of waterproof and water-stop measures;
3) Constructing the second inverted arch lining (4) for water prevention and steel bar installation to complete the construction of the second inverted arch lining (4); roughening and cleaning the base surface of the second lining of the inverted arch (4) to finish the concrete construction of the inverted arch backfilling (5);
4) All the lower pilot tunnels are synchronously erected with full-red scaffolds (8) on the same layer, after the full-red scaffolds (8) of the lower pilot tunnels are erected, an information construction means is adopted, the lengths of two lining construction sections are combined, one construction section temporary cross brace (3) in the range of a side wall two lining (7) is chiseled to spray concrete, the section steel of the temporary cross brace (3) is dismantled at intervals of one or two, and waterproof and water-stop measures are performed on the reserved section steel of the temporary cross brace (3);
5) All the upper pilot tunnels are simultaneously erected with full-hall red scaffolds (8) on the same layer, after the erection of the upper pilot tunnel full-hall red scaffolds (8) is completed, an information construction means is adopted, the length is divided by combining two lining construction sections, one construction section temporary vertical brace (2) in the range of an arch part second lining (6) is chiseled off, the section steel of the temporary vertical brace (2) is dismantled at intervals of one or two, and the remaining section steel of the temporary vertical brace (2) is subjected to waterproof and water-stop measures and detailed treatment;
6) The second side wall lining (7) and the second arch lining (6) are waterproof, steel bars are installed and constructed, a combined steel template is installed, and concrete pouring of the second lining is completed;
7) When the second lining concrete reaches the designed strength value, cutting off the remaining section steel of the temporary vertical support (2) close to the arch part second lining (6) by adopting an information construction means; dismantling and cleaning the full red scaffold (8) of the pilot tunnel on the construction section, and then continuously cutting and disconnecting the section steel of the residual temporary wale (3) close to the second lining (7) of the side wall; finally, the full-hall red scaffold (8) of each lower pilot tunnel is dismantled and cleaned;
8) And (3) by combining the site construction conditions, the large or lengthened arm gun machine is adopted to dismantle and clean the residual temporary vertical braces (2) and temporary transverse braces (3) from top to bottom, and the whole tunnel civil engineering construction is completed.
2. The safe and rapid construction method of the secondary lining of the double-side-wall pit-guide tunnel according to claim 1, wherein during the construction of the secondary lining, most of primary support temporary structures (temporary vertical braces and temporary transverse braces) are kept as much as possible, each pilot tunnel is synchronously and independently erected with a template support by using the temporary structures, and after the construction of the full-section secondary lining is completed, the secondary lining template system and the rest of the temporary structures are dismantled, so that the construction of the underground excavated tunnel is safely and rapidly completed.
3. The safe and rapid construction method of the secondary lining of the tunnel suitable for the double-side-wall pit-guide method according to claim 1, characterized in that before the construction of the secondary inverted arch lining (4), the primary support sprayed concrete in the range of the secondary inverted arch lining (4) of the temporary vertical support (2) and the backfill (5) of the inverted arch is chiseled off, and the section steel in the range of the secondary inverted arch lining (4) and the backfill (5) of the inverted arch is removed at intervals of one part or two parts.
4. The safe and rapid construction method of the tunnel secondary lining suitable for the double-side-wall pit guiding method according to claim 1, characterized in that after the construction of the inverted arch secondary lining (4) and the inverted arch backfilling (5) is completed, all red scaffolds (8) are independently and synchronously erected in each pilot tunnel, then the primary support sprayed concrete in the secondary lining range of the temporary vertical supports (2), the arch parts (6) of the temporary cross supports (3) and the side walls (7) is chiseled off, and section steel in the range of the arch parts (6) and the side walls (7) is removed at intervals of one or two.
5. The safe and rapid construction method of the secondary tunnel lining suitable for the double-side-wall pit-guide method according to claim 1, characterized in that after the construction of the secondary arch part lining (6) and the secondary side wall lining (7) is completed, the section steel of the residual temporary vertical braces (2) close to the secondary arch part lining (6) is cut off; then, dismantling and cleaning all upper pilot tunnel full red scaffolds (8), and then continuously cutting and disconnecting the section steel of the residual temporary cross braces (3) close to the second linings (7) of the side walls; and finishing the work of dismantling and cleaning the full-hall red scaffold (8) of each lower pilot tunnel, and finally finishing the dismantling and cleaning of the residual temporary vertical braces (2) and the residual temporary transverse braces (3).
6. The safe and rapid construction method suitable for the tunnel secondary lining of the double-side-wall pit guiding method according to claim 1, characterized in that the primary support of the sprayed concrete is within the range of manually chiseling the secondary inverted arch lining (4) of the temporary vertical support (2) and the backfilling (5) of the inverted arch, the primary chiseling height is the backfilling elevation + of the inverted arch concrete not more than 30cm, the cutting space of the reserved section steel is ensured, and the chiseling height is reduced as much as possible.
7. The safe and rapid construction method of the secondary lining of the tunnel suitable for the double-side-wall pit-guide method according to claim 1, characterized in that the structural steel of the temporary vertical braces (2) and the temporary transverse braces (3) is subjected to detailed water-proof and water-stop measures, and generally comprises the following construction procedures: shaped steel pollutant clearance, the stagnant water steel sheet welding of customization size, brush on water expansibility stagnant water glue to shaped steel stagnant water steel sheet welding seam, adopt water expansibility stagnant water glue to close up shaped steel root PVC waterproof board and paste one and meet water expansibility stagnant water strip, shaped steel root is executed and is done waterproof additional layer and close up fixedly.
8. The safe and rapid construction method for the tunnel secondary lining suitable for the double-side-wall pit guiding method according to claim 1, characterized in that the primary support sprayed concrete is obtained within the range of manually chiseling the arch secondary lining (6) and the side wall secondary lining (7), the primary chiseling height is more than or equal to 30cm, the reinforcing requirement of the secondary lining formwork and the reserved section steel cutting space are ensured, and the chiseling height and width are reduced as much as possible.
9. The safe and rapid construction method of the tunnel secondary lining suitable for the double-side-wall pilot tunnel method according to claim 1, characterized in that the rest temporary vertical braces (2) and the temporary cross braces (3) are dismantled, the general dismantling sequence is from top to bottom full-section step-by-step dismantling, and sequentially comprises an upper pilot tunnel temporary vertical brace, a temporary cross brace and a lower pilot tunnel temporary vertical brace, the longitudinal one-step segmental dismantling length is not suitable for overlong and is controlled within 3m, so that the temporary vertical braces in the upper pilot tunnel are not accumulated above the temporary cross braces during dismantling, and the dismantling of the temporary cross braces is further influenced; and circularly unfolding the next subsection dismantling construction after the subsection dismantling is finished.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109505630A (en) * | 2019-01-14 | 2019-03-22 | 中铁局集团有限公司 | Full-hydraulic crawler-type self trestle and construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109505630A (en) * | 2019-01-14 | 2019-03-22 | 中铁局集团有限公司 | Full-hydraulic crawler-type self trestle and construction method |
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