CN111472812A - Construction method for filling and pouring concrete into inverted arch of tunnel - Google Patents
Construction method for filling and pouring concrete into inverted arch of tunnel Download PDFInfo
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- CN111472812A CN111472812A CN202010333338.4A CN202010333338A CN111472812A CN 111472812 A CN111472812 A CN 111472812A CN 202010333338 A CN202010333338 A CN 202010333338A CN 111472812 A CN111472812 A CN 111472812A
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- 238000010276 construction Methods 0.000 title claims abstract description 81
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 238000009412 basement excavation Methods 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000013461 design Methods 0.000 claims abstract description 10
- 238000005259 measurement Methods 0.000 claims abstract description 8
- 238000005422 blasting Methods 0.000 claims abstract description 5
- 238000005553 drilling Methods 0.000 claims abstract description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 21
- 239000010959 steel Substances 0.000 claims description 21
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 13
- 239000011435 rock Substances 0.000 claims description 9
- 238000007689 inspection Methods 0.000 claims description 8
- 238000009434 installation Methods 0.000 claims description 7
- 239000002893 slag Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 230000002787 reinforcement Effects 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 239000010410 layer Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 230000002265 prevention Effects 0.000 claims description 3
- 239000011241 protective layer Substances 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 239000010802 sludge Substances 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 239000002023 wood Substances 0.000 claims description 3
- 230000007812 deficiency Effects 0.000 claims description 2
- 238000003466 welding Methods 0.000 claims 1
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000005286 illumination Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000009423 ventilation 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
- E21D11/04—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
-
- 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
- E21D11/385—Sealing means positioned between adjacent lining 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
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
- E21D11/385—Sealing means positioned between adjacent lining members
- E21D11/386—Sealing means positioned between adjacent lining members inflatable sealing means
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/006—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries by making use of blasting methods
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/01—Methods or apparatus for enlarging or restoring the cross-section of tunnels, e.g. by restoring the floor to its original level
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention provides a construction method for filling and pouring concrete into an inverted arch of a tunnel, which comprises the following steps: measuring and lofting: before excavation, measurement lofting is carried out, rechecking is carried out on the center line, the elevation and the plane position of the tunnel excavation outline, and measurement control points are placed on the side wall of the tunnel every 5m before construction to serve as control points for inverted arch excavation and concrete construction; excavating: excavating by adopting an inverted arch excavation drilling and blasting method; supporting, inverted arch and inverted arch filling and pouring concrete: concrete is intensively mixed outside the hole by adopting a concrete mixing station, and a concrete mixing transport vehicle is transported into the hole for pouring; pouring the concrete tank truck through a movable chute, and vibrating a concrete vibrating rod; the inverted arch construction joint is provided with a buried water stop according to the design requirement. The construction method of the invention accelerates the tunnel construction progress and improves the efficiency under the condition of ensuring the safety and the quality of the whole construction.
Description
Technical Field
The invention relates to the technical field of tunnel safety monitoring, in particular to a construction method for filling and pouring concrete in an inverted arch of a tunnel.
Background
In practical construction, the tunnel structure is generally composed of an arch ring, a side wall, an inverted arch, inverted arch filling, a forepoling system and an electromechanical ventilation and illumination system. At present, a tunnel is excavated by adopting a drilling and blasting method, most of an inverted arch is constructed by adopting a cast-in-place method, and the construction process comprises two steps: the other method is that an inverted arch trestle method is adopted, inverted arch trestle passing transport vehicles are utilized, inverted arch concrete is constructed below the trestle, parallel crossing is changed into three-dimensional crossing construction, inverted arch concrete reinforcement binding, concrete pouring and maintenance are not interfered with tunnel slag discharge transportation, continuous tunnel excavation construction can be met, inverted arch concrete quality can be guaranteed, the construction process is mature and generally adopted at present, but the method needs to carry out concrete pouring on the inverted arch on site, certain influence is caused on the environment, requirements on the operation environment and weather are met in construction, and limitation is achieved. The other method is to excavate inverted arch backfill hole slag by utilizing a twice-excavated slag discharge gap of the tunnel, pour an inverted arch by adopting dry and hard concrete, and discharge slag after cast-in-place concrete reaches certain strength; the method can not solve the problem of interference of tunnel excavation and inverted arch construction, can not avoid cross influence of the tunnel excavation and inverted arch construction, can cause inverted arch concrete damage and influence quality due to the fact that a slag car passes and rolls because of insufficient initial concrete strength, and is less in field use.
Most of tunnel invert construction is having the operation under the water environment, and is great to concrete quality influence, and need install the invert inner formword during the construction, and fixed and construction are all more difficult, and the template easy come-up has been strengthened in the vibration, and the concrete is not closely knit to the vibration weak point, so present tunnel construction can't satisfy present tunnel to the requirement of construction, has great potential safety hazard.
Disclosure of Invention
In order to solve the problems mentioned in the background art, the invention aims to provide a construction method for filling and pouring concrete in an inverted arch of a tunnel, so as to improve the construction efficiency.
In order to achieve the purpose, the invention provides the following technical scheme:
a construction method for filling and pouring concrete into an inverted arch of a tunnel comprises the following steps:
(1) measuring and lofting: before excavation, measurement lofting is carried out, rechecking is carried out on the center line, the elevation and the plane position of the tunnel excavation outline, and measurement control points are placed on the side wall of the tunnel every 5m before construction to serve as control points for inverted arch excavation and concrete construction;
(2) excavating: excavating by adopting an inverted arch excavation drilling and blasting method, removing rocks invading into the structural dimension in time after excavating, checking the dimension of each part to reach the design dimension requirement, and treating underexcavated parts;
(3) and (3) supporting: supporting according to different surrounding rock types, effectively connecting the full-ring steel frame section with the reserved joint of the side wall steel frame, and then performing concrete spraying operation; the base reaches the supporting condition and reports for inspection after the steel frame is installed;
(4) filling and pouring concrete into the inverted arch and the inverted arch: concrete is intensively mixed outside the hole by adopting a concrete mixing station, and a concrete mixing transport vehicle is transported into the hole for pouring; pouring the concrete tank truck through a movable chute, and vibrating a concrete vibrating rod; mounting a middle-buried water stop according to design requirements on an inverted arch construction joint;
the tamping duration of each vibration point of concrete vibration is 20-30 s, and the vibration is stopped when the concrete does not sink, no air bubbles appear and the surface presents floating slurry; the moving distance of the vibrators is smaller than 1.5 times of the acting radius of the vibrators, the depth of the vibrators inserted into the lower layer of concrete is 50-100 mm, the vibrators are kept at a distance of 50-100 mm from the side mold, and collision is avoided in construction; after the vibration is finished, the material is slowly pulled out vertically, so that the mixture accumulated at the discharging opening can not be horizontally dragged to push the mixture to a distance by using an inserted vibrating rod; and (5) starting to cure the concrete within 12 hours after the concrete is poured, and continuously curing the concrete according to the minimum curing period of 14 days.
Furthermore, before supporting operation construction, the excavation depth of the inverted arch is checked, and the bottom of the inverted arch is required to be cleaned up to expose bedrock without accumulated water.
Furthermore, accumulated water, sundries and sludge on the surface of the primary support of the inverted arch are removed before the inverted arch concrete is poured, reinforcing steel bars are bound according to the design requirements, and the concrete is poured after the reinforcing steel bars are checked to be qualified.
Furthermore, before the construction of filling concrete into the inverted arch, cleaning the upper virtual slag and sundries of the inverted arch, draining accumulated water, and pouring the concrete after the inspection is qualified; the elevation of the top surface of the filling concrete is poured and filled at one time, the elevation of the top surface of the filling concrete and longitudinal and transverse slopes need to be well controlled, and the surface meets the requirement of flatness.
Furthermore, the inverted arch construction joint and the concrete filling construction joint are required to be on the same section, the construction joint is guaranteed to be straight and flat in construction, and the construction joint must guarantee effective installation of a buried water stop; the inverted arch template is spliced by adopting a wood template, the template is not arranged in the middle part, inverted templates are arranged on two sides, the template is fixedly connected with a secondary reinforcing steel bar by a phi 18 reinforcing steel bar, and the distance between the fixed reinforcing steel bars is controlled to be about 1-1.5 m.
Further, still include inverted arch reservation and two lining arch wall reinforcing bars: the thickness of the net protective layer of the steel bar is 40 mm; the main reinforcement adopts mechanical connection, and adjacent steel bar joint staggers 1m, and the steel bar joint rate of same joint section is not more than 50%.
Further, still include waterproof drainage: a back-attached water stop belt is adopted for the circumferential construction joint of the inverted arch, and the water stop belt is ensured to be positioned in the center of the joint of the outer side of the inverted arch structure and exposed for 15cm when being installed; and a 20-30 water-swelling water stop strip is arranged in the middle of the inverted arch structure.
Further, still include deformation joint waterproof drainage: deformation joints are arranged at the light and dark boundary of the tunnel and at the surrounding rock level change positions, a middle-buried rubber water stop is adopted for water prevention of the inverted arch deformation joints, and the installation requirements are the same as those of construction joints; the position of the deformation joint requires the inverted arch steel bar to be disconnected.
According to the construction method for filling and pouring concrete into the inverted arch of the tunnel, the construction of the inverted arch is not limited by the field operation environment and the construction conditions, and the influence of the traditional field concrete pouring on the operation environments such as temperature and the like is avoided, so that the safety and the durability of the tunnel inverted arch construction are ensured, and the tunnel construction progress is accelerated under the condition that the safety and the quality of the whole construction are ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of a construction joint configuration of the present invention;
fig. 2 is a schematic view of the deformation joint structure in the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention relates to a construction method for filling and pouring concrete into an inverted arch of a tunnel, which comprises the following steps:
(1) measuring and lofting: before excavation, measurement lofting is carried out, rechecking is carried out on the center line, the elevation and the plane position of the tunnel excavation outline, and measurement control points are placed on the side wall of the tunnel every 5m before construction to serve as control points for inverted arch excavation and concrete construction;
(2) excavating: excavating by adopting an inverted arch excavation drilling and blasting method, removing rocks invading into the structural dimension in time after excavating, checking the dimension of each part to reach the design dimension requirement, and treating underexcavated parts;
(3) and (3) supporting: before the supporting operation construction, the excavation depth of the inverted arch is checked, and the bottom of the inverted arch is required to be cleaned up to expose bedrock without accumulated water.
Supporting according to different surrounding rock types, effectively connecting the full-ring steel frame section with the reserved joint of the side wall steel frame, and then performing concrete spraying operation; the base reaches the supporting condition and reports for inspection after the steel frame is installed;
(4) filling and pouring concrete into the inverted arch and the inverted arch: concrete is intensively mixed outside the hole by adopting a concrete mixing station, and a concrete mixing transport vehicle is transported into the hole for pouring; pouring the concrete tank truck through a movable chute, and vibrating a concrete vibrating rod; mounting a middle-buried water stop according to design requirements on an inverted arch construction joint;
the tamping duration of each vibration point of concrete vibration is 20-30 s, and the vibration is stopped when the concrete does not sink, no air bubbles appear and the surface presents floating slurry; the moving distance of the vibrators is smaller than 1.5 times of the acting radius of the vibrators, the depth of the vibrators inserted into the lower layer of concrete is 50-100 mm, the vibrators are kept at a distance of 50-100 mm from the side mold, and collision is avoided in construction; after the vibration is finished, the material is slowly pulled out vertically, so that the mixture accumulated at the discharging opening can not be horizontally dragged to push the mixture to a distance by using an inserted vibrating rod; and (5) starting to cure the concrete within 12 hours after the concrete is poured, and continuously curing the concrete according to the minimum curing period of 14 days.
Before the inverted arch concrete is poured, accumulated water, sundries and sludge on the surface of an inverted arch primary support are removed, reinforcing steel bars are bound according to the design requirements, and after the inspection is qualified, the concrete is poured.
Before the construction of filling concrete into the inverted arch, cleaning the upper deficiency slag and sundries of the inverted arch, removing accumulated water, and pouring the concrete after the inspection is qualified; the elevation of the top surface of the filling concrete is poured and filled at one time, the elevation of the top surface of the filling concrete and longitudinal and transverse slopes need to be well controlled, and the surface meets the requirement of flatness.
The inverted arch construction joint and the concrete filling construction joint are required to be on the same section, the construction joint is guaranteed to be straight and flat in construction, and the construction joint must ensure effective installation of a middle-buried water stop; the inverted arch template is spliced by adopting a wood template, the template is not arranged in the middle part, inverted templates are arranged on two sides, the template is fixedly connected with a secondary reinforcing steel bar by a phi 18 reinforcing steel bar, and the distance between the fixed reinforcing steel bars is controlled to be about 1-1.5 m.
Still include the inverted arch reservation and two lining arch wall reinforcing bars: the thickness of the net protective layer of the steel bar is 40 mm; the main reinforcement adopts mechanical connection, and adjacent steel bar joint staggers 1m, and the steel bar joint rate of same joint section is not more than 50%.
Still include waterproof drainage: as shown in fig. 1, a back-attached water stop is adopted for an annular construction joint of an inverted arch, and the water stop is ensured to be positioned in the center of a joint on the outer side of an inverted arch structure and exposed for 15cm when being installed; and a 20-30 water-swelling water stop strip is arranged in the middle of the inverted arch structure.
Still include that movement joint prevents drainage: as shown in fig. 2, deformation joints are arranged at the light and dark boundary of the tunnel and at the surrounding rock level change position, a middle-buried rubber water stop is adopted for water prevention of the inverted arch deformation joints, and the installation requirements are the same as those of construction joints; the position of the deformation joint requires the inverted arch steel bar to be disconnected.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A construction method for filling and pouring concrete in an inverted arch of a tunnel is characterized by comprising the following steps: the method comprises the following steps:
(1) measuring and lofting: before excavation, measurement lofting is carried out, rechecking is carried out on the center line, the elevation and the plane position of the tunnel excavation outline, and measurement control points are placed on the side wall of the tunnel every 5m before construction to serve as control points for inverted arch excavation and concrete construction;
(2) excavating: excavating by adopting an inverted arch excavation drilling and blasting method, removing rocks invading into the structural dimension in time after excavating, checking the dimension of each part to reach the design dimension requirement, and treating underexcavated parts;
(3) and (3) supporting: supporting according to different surrounding rock types, effectively connecting the full-ring steel frame section with the reserved joint of the side wall steel frame, and then performing concrete spraying operation; the base reaches the supporting condition and reports for inspection after the steel frame is installed;
(4) filling and pouring concrete into the inverted arch and the inverted arch: concrete is intensively mixed outside the hole by adopting a concrete mixing station, and a concrete mixing transport vehicle is transported into the hole for pouring; pouring the concrete tank truck through a movable chute, and vibrating a concrete vibrating rod; mounting a middle-buried water stop according to design requirements on an inverted arch construction joint;
the tamping duration of each vibration point of concrete vibration is 20-30 s, and the vibration is stopped when the concrete does not sink, no air bubbles appear and the surface presents floating slurry; the moving distance of the vibrators is smaller than 1.5 times of the acting radius of the vibrators, the depth of the vibrators inserted into the lower layer of concrete is 50-100 mm, the vibrators are kept at a distance of 50-100 mm from the side mold, and collision is avoided in construction; after the vibration is finished, the material is slowly pulled out vertically, so that the mixture accumulated at the discharging opening can not be horizontally dragged to push the mixture to a distance by using an inserted vibrating rod; and (5) starting to cure the concrete within 12 hours after the concrete is poured, and continuously curing the concrete according to the minimum curing period of 14 days.
2. The construction method for filling and pouring concrete into the inverted arch of the tunnel according to claim 1, wherein: before the supporting operation construction, the excavation depth of the inverted arch is checked, and the bottom of the inverted arch is required to be cleaned up to expose bedrock without accumulated water.
3. The construction method for filling and pouring concrete into the inverted arch of the tunnel according to claim 1, wherein: before the inverted arch concrete is poured, accumulated water, sundries and sludge on the surface of an inverted arch primary support are removed, reinforcing steel bars are bound according to the design requirements, and after the inspection is qualified, the concrete is poured.
4. The construction method for filling and pouring concrete into the inverted arch of the tunnel according to claim 1, wherein: before the construction of filling concrete into the inverted arch, cleaning the upper deficiency slag and sundries of the inverted arch, removing accumulated water, and pouring the concrete after the inspection is qualified; the elevation of the top surface of the filling concrete is poured and filled at one time, the elevation of the top surface of the filling concrete and longitudinal and transverse slopes need to be well controlled, and the surface meets the requirement of flatness.
5. The construction method for filling and pouring concrete into the inverted arch of the tunnel according to claim 1, wherein: the inverted arch construction joint and the concrete filling construction joint are required to be on the same section, the construction joint is guaranteed to be straight and flat in construction, and the construction joint must ensure effective installation of a middle-buried water stop; the inverted arch template is spliced by adopting a wood template, the template is not arranged in the middle part, inverted templates are arranged on two sides, the template is fixedly connected with a secondary reinforcing steel bar by a phi 18 reinforcing steel bar, and the distance between the fixed reinforcing steel bars is controlled to be about 1-1.5 m.
6. The construction method for filling and pouring concrete into the inverted arch of the tunnel according to claim 1, wherein: still include the inverted arch reservation and two lining arch wall reinforcing bars: the thickness of the net protective layer of the steel bar is 40 mm; the main reinforcement adopts mechanical connection, and adjacent steel bar joint staggers 1m, and the steel bar joint rate of same joint section is not more than 50%.
7. The construction method for filling and pouring concrete into the inverted arch of the tunnel according to claim 1, wherein: still include waterproof drainage: a back-attached water stop belt is adopted for an inverted arch circumferential construction joint, the back-attached water stop belt is installed by adopting hot air welding, and the back-attached water stop belt is ensured to be positioned in the center of a joint on the outer side of an inverted arch structure and exposed for 15cm during installation; and a water-swelling water stop strip is arranged in the middle of the inverted arch structure.
8. The construction method for filling and pouring concrete into the inverted arch of the tunnel according to claim 1, wherein: still include that movement joint prevents drainage: deformation joints are arranged at the light and dark boundary of the tunnel and at the surrounding rock level change positions, a middle-buried rubber water stop is adopted for water prevention of the inverted arch deformation joints, and the installation requirements are the same as those of construction joints; the position of the deformation joint requires the inverted arch steel bar to be disconnected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010333338.4A CN111472812A (en) | 2020-04-24 | 2020-04-24 | Construction method for filling and pouring concrete into inverted arch of tunnel |
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| CN202010333338.4A CN111472812A (en) | 2020-04-24 | 2020-04-24 | Construction method for filling and pouring concrete into inverted arch of tunnel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113833499A (en) * | 2021-10-18 | 2021-12-24 | 重庆交通大学 | Grouting device for pipe shed arch center for tunnel construction and grouting method thereof |
| CN114060059A (en) * | 2021-11-15 | 2022-02-18 | 中铁十九局集团第六工程有限公司 | Construction method of tunnel bottom deformation monitoring device |
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| CN113833499A (en) * | 2021-10-18 | 2021-12-24 | 重庆交通大学 | Grouting device for pipe shed arch center for tunnel construction and grouting method thereof |
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