CN111425222A - Method for protecting partition wall in multi-arch tunnel - Google Patents

Method for protecting partition wall in multi-arch tunnel Download PDF

Info

Publication number
CN111425222A
CN111425222A CN202010345135.7A CN202010345135A CN111425222A CN 111425222 A CN111425222 A CN 111425222A CN 202010345135 A CN202010345135 A CN 202010345135A CN 111425222 A CN111425222 A CN 111425222A
Authority
CN
China
Prior art keywords
grouting
intermediate wall
partition wall
concrete
tunnel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010345135.7A
Other languages
Chinese (zh)
Inventor
金阳
陈小羊
王立志
张�浩
高晓波
胡连超
马力
张永
邓庭彦
丁冲
岳盟
韩忠军
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Construction Seventh Engineering Division Corp Ltd
Original Assignee
China Construction Seventh Engineering Division Corp Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China Construction Seventh Engineering Division Corp Ltd filed Critical China Construction Seventh Engineering Division Corp Ltd
Priority to CN202010345135.7A priority Critical patent/CN111425222A/en
Publication of CN111425222A publication Critical patent/CN111425222A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/04Lining with building materials
    • E21D11/10Lining 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
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/003Linings or provisions thereon, specially adapted for traffic tunnels, e.g. with built-in cleaning devices
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/14Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings

Abstract

The invention relates to a method for protecting a partition wall in a multi-arch tunnel, which effectively solves the problems that the tunnel portal is easy to collapse and the partition wall is easy to damage in the excavation; the technical scheme for solving the problem is that concrete is poured from two sides to the top through grouting pipes, secondary grouting and pressure maintaining are carried out from the grouting pipes on the two sides to the top in a crossed mode after the concrete is initially set, and the intermediate wall is tightly filled; the invention enables the top of the intermediate wall to be densely backfilled, settlement observation data shows that the vault does not obviously sink, the tunnel portal is firm and reliable, the structure is not easy to loosen, the collapse phenomenon is prevented, the phenomena of collapse, collapse and block falling are not easy to generate in the excavation process, flying stones generated by blasting are not easy to cause great damage to the intermediate wall when impacting the intermediate wall, and the rigidity strength of the intermediate wall is improved without influencing the bearing performance of the tunnel.

Description

Method for protecting partition wall in multi-arch tunnel
Technical Field
The invention relates to the technical field of tunnel engineering, in particular to a method for protecting a partition wall in a multi-arch tunnel.
Background
In the construction process of a high-grade highway, a road section needing to be built is often encountered, and the adoption of a multi-arch tunnel in the conventional highway tunnel is more and more common, because the multi-arch tunnel has certain superiority in the aspects of reducing occupied area, improving the smooth condition of the highway, reducing the manufacturing cost of the highway and the like;
for some tunnels, the mountain slope rock-soil body at the inlet and the outlet of the tunnel is composed of a fourth system of complete new system residual slope accumulated material and strong weathering mixed granite, the fourth system of residual slope accumulated material or the complete weathering mixed granite is large in thickness, loose in structure and easy to collapse, so that the stability of the rock-soil body at the hole opening is extremely poor, shallow engineering landslide or large collapse is easily generated during construction and excavation, the strong weathering rock body is influenced by joint, crack and weathering, the rock body is broken, collapse and block falling phenomena are easily generated during excavation, flying stones generated by blasting greatly influence the impact of the intermediate wall, and as the distance between a blasting point and the intermediate wall is short, the flying stones can cause certain damage to the surface of the intermediate wall, the quality of the intermediate wall is influenced, and the bearing performance of the tunnel is further influenced, so that the protection of the intermediate wall is very necessary.
Disclosure of Invention
Aiming at the situation, in order to overcome the defects of the prior art, the invention provides a method for protecting the partition wall in the multi-arch tunnel, which effectively solves the problems that the tunnel portal is easy to collapse and the partition wall is easy to damage when being excavated.
The technical scheme for solving the problem is that the method for protecting the partition wall in the multi-arch tunnel comprises the following construction steps:
the method comprises the following steps: after the partition wall template is arranged in the middle pilot tunnel, checking whether the local part of the vault of the middle pilot tunnel has the phenomena of undulation and non-roundness, and supplementing the template to the place where the connection part of the partition wall steel mold and the vault has a leak in advance;
step two: transversely penetrating grouting pipes into the vertical middle partition walls from two sides of the top of the middle partition wall, enabling pipe openings to extend to the arc top, perforating the grouting pipes, enabling the perforation intervals to be 18 cm, enabling exposed sections not to be perforated, uniformly distributing the grouting pipes on each side along the direction of the middle partition wall, and arranging the grouting pipes on two sides in a staggered mode;
step three: pouring concrete into the template from the grouting pipe, and pouring along the longitudinal direction of the line and the upward slope direction until the concrete cannot be poured;
step four: when the edge-sealed concrete reaches the form removal time, removing the form, and spraying, protecting and sealing the part, which is not combined with the vault, of the shoulder of the intermediate wall by using sprayed concrete;
step five: preparing cement paste with the same label as the middle partition wall through a test, grouting the middle partition wall of every two molds once by using a grouting machine, wherein the interval between every two molds is 10m, grouting from a low position to a high position, opening an exhaust valve of a grouting pipe before grouting until thick slurry is discharged, closing the grouting pipes one by one, continuously pressurizing for 2-3 minutes, and adjusting grouting pressure by taking the reading of a pressure gauge as a standard;
step six: and after the strength of the pressure grouting liquid reaches the designed strength, cutting off the grouting pipe head by using a grinding wheel cutting machine, and polishing the grouting pipe head to be flat.
The construction process can enable concrete pouring of the intermediate wall to be more compact, the tunnel portal is firm and reliable, the intermediate wall is not easy to loose, collapse and fall blocks are not easy to generate in the excavation process, flying stones generated by blasting are not easy to cause great damage to the intermediate wall when impacting the intermediate wall, the rigidity strength of the intermediate wall is improved, the bearing performance of the tunnel cannot be affected, the intermediate wall of the multi-arch tunnel can be effectively protected, and the stability of the multi-arch tunnel is further improved.
Drawings
FIG. 1 is a schematic cross-sectional view of the front view of the present invention.
In the figure: 1 mountain body, 2 tunnel portals, 3 mid-walls, 4, middle pilot tunnel arch.
Detailed Description
The following description of the embodiments of the present invention will be made in detail with reference to the accompanying drawings.
The construction method comprises the following steps:
the method comprises the following steps: after the partition wall template is arranged in the middle pilot tunnel, checking whether the local part of the vault of the middle pilot tunnel has the phenomena of undulation and non-roundness, and supplementing the template to the place where the connection part of the partition wall steel mold and the vault has a leak in advance;
step two: transversely penetrating grouting pipes into the vertical middle partition walls from two sides of the top of the middle partition wall, enabling pipe openings to extend to the arc top, perforating the grouting pipes, enabling the perforation intervals to be 18 cm, enabling exposed sections not to be perforated, uniformly distributing the grouting pipes on each side along the direction of the middle partition wall, and arranging the grouting pipes on two sides in a staggered mode;
step three: pouring concrete into the template from the grouting pipe, and pouring along the longitudinal direction of the line and the upward slope direction until the concrete cannot be poured;
step four: when the edge-sealed concrete reaches the form removal time, removing the form, and performing spray protection sealing on the part, which is not combined with the vault, of the shoulder part of the middle partition wall by using sprayed concrete so as to prevent slurry leakage in the grouting process;
step five: preparing cement paste with the same label as the middle partition wall through a test, grouting the middle partition wall of every two molds once by using a grouting machine, wherein the interval between every two molds is 10m, grouting from a low position to a high position, opening an exhaust valve of a grouting pipe before grouting until thick slurry is discharged, closing the grouting pipes one by one, continuously pressurizing for 2-3 minutes, and adjusting grouting pressure by taking the reading of a pressure gauge as a standard;
step six: after the strength of the grouting liquid reaches the designed strength, the stability of the multi-arch tunnel intermediate wall after the pouring is finished can be ensured, the grouting pipe head is cut off by using a grinding wheel cutting machine, and the flatness after the pouring of the multi-arch tunnel intermediate wall is finished can be ensured.
In the first step, the supplementary template is made of bamboo plywood, the supplementary template is processed, installed and fixed according to the shape and the size of the leak, and all seams and gaps are sealed by foam rubber.
In the second step, the grouting pipe is fixed on the steel bars in the middle partition wall through binding or spot welding to prevent loosening, falling or displacement in the concrete pouring process, and a valve is arranged at the exposed port of the grouting pipe to prevent the grout from flowing backwards after grouting and control the grouting pressure.
In the third step, after the concrete pouring is finished, the middle partition wall template and the top of the middle pilot hole are scraped by the scraper, and a small amount of concrete is poured to fill the concrete in the template inside the middle partition wall, so that the concrete in the middle partition wall is poured to the highest position in the pouring process.
In the fifth step, the grouting machine adopts a mortar stirrer.
In the fifth step, the left side and the right side of the partition wall are subjected to staggered grouting in the grouting process to ensure grouting compactness, the grouting pipe on the other side is opened when grouting is carried out on one side, and grouting is stopped after grout flows out of the grouting pipe on the non-grouting side; the grouting pipe has two functions, namely, the grouting pipe is used as an exhaust pipe, whether grout is filled is detected, and if the grout is filled, the grout can flow out of the pipe on the other side.
In the fifth step, two sides of the intermediate wall are not tightly sealed, when slurry leakage occurs in the grouting process, secondary grouting compensation is performed after 12 hours of grouting, and after grouting is completed, slurry sprayed on the top surface of the intermediate wall is cleaned.
The grouting pipes are steel pipes with the diameter of 40mm, the longitudinal distance is 2.5m, and the left side and the right side are arranged in a staggered mode.
The model of the cement paste is M25, the initial pressure adopted by the grouting machine is 0.6-0.8MPa, and the final pressure is 1 MPa.
Compared with the prior art, the invention has the beneficial effects that:
after the constructor carries out construction operation through the protection method, due to the operation of pouring in the third step, in order to enable the pouring to be more compact after the concrete pouring is finished, the concrete is paved through the scraper plate, and simultaneously, a small amount of concrete is poured, so that the concrete is filled in the internal template of the intermediate wall, the concrete of the intermediate wall is poured to the highest position in the pouring process, the later-stage main hole is excavated, the side surface of the later-stage main hole is observed, the top of the intermediate wall is backfilled compactly, and settlement observation data show that the vault does not have obvious settlement; and through the fourth step and the fifth step, the spraying concrete is used for spraying, protecting and sealing the combined part of the shoulder part and the vault of the intermediate wall, preventing slurry leakage in the grouting process, grouting from a low position to a high position, opening an exhaust valve of a grouting pipe before grouting until dense slurry is emitted, closing one by one, continuously pressurizing, and filling the template in the intermediate wall with concrete, so that the tunnel entrance is firm and reliable, the structure is not easy to loosen, and collapse phenomenon is prevented, and similarly, the upper structure of the tunnel exit is still stable and compact, so that a strongly weathered rock mass is not easily influenced by joint, crack and weathering, collapse and block falling are not easily generated in the excavation process, flying stones generated by blasting are not easy to cause great damage to the intermediate wall when impacting the intermediate wall, the rigidity strength of the intermediate wall is improved, the bearing performance of the tunnel is not influenced, and the intermediate wall in the multi-arch tunnel can be effectively protected, the stability of the multi-arch tunnel is further improved.

Claims (7)

1. A method for protecting a partition wall in a multi-arch tunnel is characterized by comprising the following construction steps:
the method comprises the following steps: after the partition wall template is arranged in the middle pilot tunnel, checking whether the local part of the vault of the middle pilot tunnel has the phenomena of undulation and non-roundness, and supplementing the template to the place where the connection part of the partition wall steel mold and the vault has a leak in advance;
step two: transversely penetrating grouting pipes into the vertical middle partition walls from two sides of the top of the middle partition wall, enabling pipe openings to extend to the arc top, perforating the grouting pipes, enabling the perforation intervals to be 18 cm, enabling exposed sections not to be perforated, uniformly distributing the grouting pipes on each side along the direction of the middle partition wall, and arranging the grouting pipes on two sides in a staggered mode;
step three: pouring concrete into the template from the grouting pipe, and pouring along the longitudinal direction of the line and the upward slope direction until the concrete cannot be poured;
step four: when the edge-sealed concrete reaches the form removal time, removing the form, and spraying, protecting and sealing the part, which is not combined with the vault, of the shoulder of the intermediate wall by using sprayed concrete;
step five: preparing cement slurry with the same label as the middle partition wall through a test, grouting the middle partition wall once every two molds by using a grouting machine, pressing the grouting from a low position to a high position, opening an exhaust valve of a grouting pipe before the grouting until thick slurry is emitted, closing the exhaust valves one by one, and continuously pressurizing for 2-3 minutes;
step six: and after the strength of the pressure grouting liquid reaches the designed strength, cutting off the grouting pipe head by using a grinding wheel cutting machine, and polishing the grouting pipe head to be flat.
2. The method as claimed in claim 1, wherein in the first step, the supplementary form is made of bamboo plywood, and is formed and fixed according to the shape and size of the hole, and all seams and gaps are sealed with foam rubber.
3. The method for protecting an intermediate wall in an arch-connected tunnel according to claim 1, wherein in the second step, the grouting pipe is fixed on the steel bar in the intermediate wall by binding or spot welding, and a valve is arranged at an exposed port of the grouting pipe.
4. The method for protecting an intermediate wall in an arch-connected tunnel according to claim 1, wherein in the third step, after the concrete pouring is completed, the junction between the intermediate wall form and the top of the intermediate pilot tunnel is screeded by a screeding board while a small amount of concrete is poured.
5. The method for protecting an intermediate wall in an arch-connected tunnel according to claim 1, wherein in the fifth step, the mortar press employs a mortar mixer.
6. The method for protecting an intermediate wall in an arch-connected tunnel according to claim 1, wherein in the fifth step, the left and right sides of the intermediate wall are alternately grouted during grouting to ensure grouting compactness, and when grouting is performed on one side, the grouting pipe on the opposite side is opened, and grouting is stopped after grout flows out from the grouting pipe on the non-grouting side.
7. The method as claimed in claim 1, wherein in the fifth step, both sides of the intermediate wall are not tightly closed, and when slurry leakage occurs during grouting, secondary grouting is performed for compensation 12 hours after grouting, and after grouting is completed, slurry sprayed on the top surface of the intermediate wall is cleaned.
CN202010345135.7A 2020-04-27 2020-04-27 Method for protecting partition wall in multi-arch tunnel Pending CN111425222A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010345135.7A CN111425222A (en) 2020-04-27 2020-04-27 Method for protecting partition wall in multi-arch tunnel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010345135.7A CN111425222A (en) 2020-04-27 2020-04-27 Method for protecting partition wall in multi-arch tunnel

Publications (1)

Publication Number Publication Date
CN111425222A true CN111425222A (en) 2020-07-17

Family

ID=71556981

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010345135.7A Pending CN111425222A (en) 2020-04-27 2020-04-27 Method for protecting partition wall in multi-arch tunnel

Country Status (1)

Country Link
CN (1) CN111425222A (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000110497A (en) * 1998-10-09 2000-04-18 Shigeo Nagahama Water stop construction method for concrete underground structure jointly using freezing method, and water stop device used therefor
KR100438794B1 (en) * 2002-11-22 2004-07-07 (주)현이앤씨 Construction method for three arch excavation tunnel
CN104929659A (en) * 2015-05-22 2015-09-23 大连市市政设计研究院有限责任公司 Bi-arched tunnel middle-partition top surrounding rock strengthening system
CN207634085U (en) * 2017-11-24 2018-07-20 警通建设(集团)有限公司 A kind of mid-partition of multi-arch road tunnel protection structure
CN108571342A (en) * 2018-03-19 2018-09-25 中建三局基础设施建设投资有限公司 A kind of Middle Wall of Multi-Arch Highway Tunnel top waterproof/drainage structure and its construction method
CN208441871U (en) * 2018-06-30 2019-01-29 四川锦城智信建设工程有限公司 A kind of interior formed of large diameter shield tunnel digs station structure
CN208966367U (en) * 2018-09-19 2019-06-11 中建三局基础设施建设投资有限公司 A kind of device pouring compactness for improving double-arched tunnel mid-board top

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000110497A (en) * 1998-10-09 2000-04-18 Shigeo Nagahama Water stop construction method for concrete underground structure jointly using freezing method, and water stop device used therefor
KR100438794B1 (en) * 2002-11-22 2004-07-07 (주)현이앤씨 Construction method for three arch excavation tunnel
CN104929659A (en) * 2015-05-22 2015-09-23 大连市市政设计研究院有限责任公司 Bi-arched tunnel middle-partition top surrounding rock strengthening system
CN207634085U (en) * 2017-11-24 2018-07-20 警通建设(集团)有限公司 A kind of mid-partition of multi-arch road tunnel protection structure
CN108571342A (en) * 2018-03-19 2018-09-25 中建三局基础设施建设投资有限公司 A kind of Middle Wall of Multi-Arch Highway Tunnel top waterproof/drainage structure and its construction method
CN208441871U (en) * 2018-06-30 2019-01-29 四川锦城智信建设工程有限公司 A kind of interior formed of large diameter shield tunnel digs station structure
CN208966367U (en) * 2018-09-19 2019-06-11 中建三局基础设施建设投资有限公司 A kind of device pouring compactness for improving double-arched tunnel mid-board top

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
程学强: "公路连拱隧道中隔墙顶部回填方法及控制要点", 《价值工程》 *

Similar Documents

Publication Publication Date Title
CN102322058B (en) Construction process and equipment for downhole impacting high-pressure jet grouting pile
CN204401432U (en) A kind of measures of cracks on concrete pavement repairs structure
CN103541359B (en) Method for repairing and treating quality defect of cast-in-place pile
CN100387785C (en) Hydraulic sheeting and use method thereof
CN106321121A (en) Vibration disturbance resistant crack leaking stoppage and reinforcement method applied to underground works
CN107201910A (en) For shaking traffic tunnel fracture plugging and reinforcement means under bumpy weather
CN104831734B (en) A kind of deep basal pit building rotary churning pile Composition Soil Nailing Walls construction method
CN108533278B (en) Large-diameter slurry shield earth covering balance comprehensive receiving construction method under complex environment strong permeable stratum working condition
CN106917409A (en) A kind of rock lid weight consolidation grouting construction method
CN111119128B (en) Danger-removing, reinforcing and seepage-proofing method for natural rock-fill dam of barrier lake
CN101788082A (en) Construction method for abutting jack pipe underground
CN106381840A (en) Leaking stoppage grouting method for cracks under high pressure flowing water state
CN110469332B (en) Advanced support consolidation method for tunnel penetrating through debris flow accumulation body
CN109681235B (en) Method for repairing highway tunnel lining cavity with poor surrounding rock
CN113090068B (en) Vacuum pouring process for rush-repairing deep-buried building top concrete structure under limited conditions
CN109386293A (en) The sealed reception construction method of large section rectangular top pipe
CN109403332B (en) Method for combined excavation of layered bench sections of deep foundation pit of sandy cobble thick covering layer wide shallow valley
CN106522248A (en) Method for reinforcing soil slope and slope reinforcing device
CN209324375U (en) A kind of reparation structure of the poor highway tunnel lining cavity of pair of country rock
CN109667607B (en) Tunnel partition waterproof construction process
CN108385612B (en) Construction method of concrete protective panel with good stability
CN101892637A (en) Ring type anchor rod locking method for repairing cracks on abutment side wall of highway bridge abutment
CN109113068A (en) A kind of inverse construction joint structure for building construction of deep basal pit
CN112482415B (en) Consolidation grouting method for underground cavern under high external water pressure and flowing water condition
CN111425222A (en) Method for protecting partition wall in multi-arch tunnel

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
CB02 Change of applicant information

Address after: No.267, 15th Street, Jingkai, Zhengzhou, Henan Province, 450000

Applicant after: CHINA CONSTRUCTION SEVENTH ENGINEERING DIVISION Corp.,Ltd.

Address before: 450000 No. 116 Chengdong Road, Jinshui District, Henan, Zhengzhou

Applicant before: CHINA CONSTRUCTION SEVENTH ENGINEERING DIVISION Corp.,Ltd.

CB02 Change of applicant information
RJ01 Rejection of invention patent application after publication

Application publication date: 20200717

RJ01 Rejection of invention patent application after publication