CN114542091B - Advanced pre-support construction method and structure for small-caliber pipe curtain of underground excavation close-connection project - Google Patents
Advanced pre-support construction method and structure for small-caliber pipe curtain of underground excavation close-connection project Download PDFInfo
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- CN114542091B CN114542091B CN202210440875.8A CN202210440875A CN114542091B CN 114542091 B CN114542091 B CN 114542091B CN 202210440875 A CN202210440875 A CN 202210440875A CN 114542091 B CN114542091 B CN 114542091B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Abstract
The invention relates to an advanced pre-support construction method and structure for a small-caliber pipe curtain of a subsurface excavation approaching engineering, wherein the advanced pre-support construction method for the small-caliber pipe curtain of the subsurface excavation approaching engineering comprises the following steps: determining an initial end of the small-caliber pipe curtain construction of the underground excavation approaching engineering; arranging a small-caliber pipe curtain steel pipe along the outer side of the excavation contour line of the underground tunnel at the initiating end; carrying out grouting lap joint on the small-caliber pipe curtain steel pipe; the pipe curtain blocking wall is arranged at the initiating end, so that the influence of underground excavation construction on the existing structures and the surrounding environment can be effectively reduced, the method has the advantages of wide application range, low requirement on operation space, high tunneling speed, high precision control and the like, and is used for advanced pre-support of the existing structures with short underground excavation crossing distance, high risk, sensitive displacement and the like of the underground structure.
Description
Technical Field
The invention relates to the field of underground excavation engineering support, in particular to an advanced pre-support construction method and structure for a small-caliber pipe curtain of an underground excavation proximity engineering.
Background
Along with the economic development and population centralization, in order to improve the convenience of urban public transportation, the urban construction is gradually promoted to the direction of integration and hub, so that the new construction is inevitably close to the existing structures in urban 'crack'. The requirement of a newly built project on a supporting method of an underground excavation proximity project is higher and higher due to the limitation of ground space and surrounding environment; the traditional underground excavation engineering supporting method is difficult to consider safety and space, and limits the feasibility of the new construction. The pipe shed and pipe curtain construction method is used as a support method of underground excavation engineering and has mature application in domestic engineering construction: the pipe shed is usually used as pre-support for underground excavation projects, the space requirement is small, but the safety and the construction precision of the high-risk underground excavation approaching projects are difficult to guarantee; the pipe curtain often props as the excavation engineering and uses, and although the security is high, the pipe curtain pipe diameter is on the large side, the construction space demand is big, and the suitability is also very restricted. Therefore, a new supporting method for underground excavation engineering is needed, and the influence of underground excavation construction on the space requirement and the surrounding environment is reduced as much as possible on the premise of ensuring safety.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an advanced pre-supporting construction method for a small-caliber pipe curtain of a subsurface excavation approaching engineering, which comprises the following steps:
determining an initial end of the small-caliber pipe curtain construction of the underground excavation approaching engineering;
arranging a construction vertical shaft support after a construction vertical shaft is downwards arranged on the ground to serve as a subsurface excavation construction working well;
the underground excavation construction working well is used as an initial end of the small-caliber pipe curtain construction of the underground excavation approaching engineering;
arranging a small-caliber pipe curtain steel pipe along the outer side of the excavation contour line of the underground tunnel at the initiating end;
carrying out grouting lap joint on the small-caliber pipe curtain steel pipe;
grouting steel floral tubes are welded on two sides of the small-caliber pipe curtain steel tube;
carrying out grouting lap joint on adjacent small-caliber pipe curtain steel pipes by using the grouting steel floral pipes;
and arranging a plugging structure at the initiating end to complete pre-support.
Preferably, it includes to set up small-bore pipe curtain steel pipe along the undercut tunnel excavation contour line outside originating side:
arranging a small-caliber pipe curtain steel pipe along the outer side of the excavation contour line of the underground excavation tunnel;
and (5) performing pressure irrigation filling on the small-caliber pipe curtain steel pipe by using pea gravel concrete.
Further, set up small-bore pipe curtain steel pipe along the undercut tunnel excavation contour line outside and include:
constructing and arranging a small-caliber pipe curtain steel pipe by using a cutter head retractable type micro shield pipe curtain machine;
welding grooves are formed among the small-caliber pipe curtain steel pipe segments, and a mould is manufactured according to the welding grooves for welding;
wherein, utilize the little shield pipe curtain machine of cutter disc formula of can backing back to construct and set up small-bore pipe curtain steel pipe and do not set up the camber angle and level and beat and establish.
Further, the welding according to the welding groove manufacturing mold comprises:
the joints between the adjacent small-caliber pipe curtain steel pipes in the cross section of the same underground excavation approach project are staggered in a sectional mode, and the joint rate is not more than 50%.
Preferably, the step of arranging a plugging structure at the originating end to complete pre-support comprises:
and after the steel pipe at the initial end is connected with the steel bars of the blocking structure in a welding manner, pouring the exposed part of the small-caliber pipe curtain steel pipe to form an integral support with the blocking structure so as to complete the pre-support.
Based on the same conception, the invention also provides a small-caliber pipe curtain advanced pre-supporting structure for the underground excavation close-connection engineering, which comprises a small-caliber pipe curtain steel pipe, grouting steel floral tubes, pea gravel concrete, a construction shaft support and a pipe curtain blocking wall, wherein the small-caliber pipe curtain steel pipe is arranged on the outer side of an excavation contour line of the underground excavation tunnel, the small-caliber pipe curtain steel pipe is filled with the pea gravel concrete in a filling manner, the grouting steel floral tubes with the same length as the small-caliber pipe curtain steel pipe are welded on two sides of the small-caliber pipe curtain steel pipe, the pipe curtain blocking wall is arranged at the initial end of the small-caliber pipe curtain steel pipe, and the pipe curtain blocking wall is arranged inside the construction shaft support and forms a whole.
Compared with the closest prior art, the invention has the following beneficial effects:
when the surrounding environment of the newly-built structure is complex and the ground construction conditions are limited, the method has the advantages of small construction operation space and high precision control, and effectively compresses the use space of the surrounding environment; the small-caliber pipe curtain is used as a pre-supporting means, so that a rigid barrier is formed between the underground excavation engineering and the existing structure, the excavation and the supporting of the underground excavation engineering are ensured under the condition of reducing disturbance to the existing structure, and the overall safety of the underground excavation proximity construction is greatly enhanced; meanwhile, the grouting and lapping mode of the steel floral tubes among the tube curtains is flexible, the working procedures of the construction method are simple, the underground excavation approaching construction quality and efficiency are obviously improved, and the method has wide applicability.
Drawings
FIG. 1 is a schematic flow chart of a method for advanced pre-supporting construction of a small-caliber pipe curtain of an underground excavation approaching engineering provided by the invention;
FIG. 2 is a schematic elevation view of a small-caliber pipe curtain advanced pre-supporting structure of an underground excavation approaching engineering provided by the present invention;
FIG. 3 is a schematic cross-sectional view of a pre-supporting structure of a small-caliber pipe curtain for a subsurface excavation approaching engineering provided by the present invention;
FIG. 4 is a schematic view of the connection between the inside of the small-caliber pipe curtain and the pipe curtain of the advanced pre-supporting structure of the small-caliber pipe curtain of the underground excavation approaching engineering provided by the invention;
description of reference numerals:
1. a small-bore tube curtain steel tube; 2. grouting a steel perforated pipe; 3. pea gravel concrete; 4. constructing a vertical shaft support; 5. the pipe curtain seals the wall; 6. constructing a shaft support breaking range; 7. underground excavation primary support; 8. and (5) secondary lining.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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.
Example 1:
the invention provides an advanced pre-support construction method for a small-caliber pipe curtain of a subsurface excavation approaching project, which comprises the following steps of:
step 1: determining an initial end of the small-caliber pipe curtain construction of the underground excavation approaching engineering;
step 2: arranging small-caliber pipe-curtain steel pipes at the originating end along the outer side of the excavation contour line of the underground tunnel;
and 3, step 3: carrying out grouting lap joint on the small-caliber pipe curtain steel pipe;
and 4, step 4: and arranging a pipe curtain plugging wall at the initiating end to complete pre-support.
The step 1 specifically comprises the following steps:
1-1: arranging a construction vertical shaft support after a construction vertical shaft is downwards arranged on the ground to serve as a subsurface excavation construction working well;
1-2: and utilizing the underground excavation construction working well as an initial end of the small-caliber pipe curtain construction of the underground excavation approaching project.
The step 2 specifically comprises the following steps:
2-1: arranging a small-caliber pipe curtain steel pipe along the outer side of the excavation contour line of the underground excavation tunnel;
2-2: and (5) performing pressure irrigation filling on the small-caliber pipe curtain steel pipe by using pea gravel concrete.
In the embodiment, a method for advanced pre-support construction of a small-caliber pipe curtain of an underground excavation proximity project is provided, wherein the pipe curtain data of the small-caliber pipe curtain is about 400mm in pipe diameter, the small-caliber pipe curtain is used as a pre-support means, and a steel floral pipe (the diameter is generally 25 mm-50 mm) welded between pipe curtains is adopted for grouting lap joint (the grouting range is within 0.5m of the periphery of the steel floral pipe), so that a rigid barrier is formed between the underground excavation project and an existing structure, excavation and support of the underground excavation project are guaranteed under the condition of reducing disturbance to the existing structure, and the overall safety of the underground excavation proximity project is enhanced.
In the embodiment, the advanced pre-supporting construction method for the small-caliber pipe curtain of the underground excavation close-up project is characterized in that pea gravel concrete is filled into a steel pipe through pressure filling after a single pipe curtain steel pipe is arranged, retreating construction is adopted, and end sealing and air exhaust of the steel pipe are well performed. And (3) grouting the steel perforated pipe after the pipe curtain steel pipes are completely arranged, wherein the grouting pressure is preferably 0.2-0.4 MPa, and cement slurry is adopted.
The step 2-1 specifically comprises:
2-1-1: constructing and arranging a small-caliber pipe curtain steel pipe by using a cutter head retractable type micro shield pipe curtain machine;
2-1-2: welding grooves are formed among the small-caliber pipe curtain steel pipe segments, and a mould is manufactured according to the welding grooves for welding;
wherein, utilize the little shield pipe curtain machine of cutter disc formula of can backing back to construct and set up small-bore pipe curtain steel pipe and do not set up the camber angle and level and beat and establish.
In the embodiment, in the advanced pre-support construction method of the small-caliber pipe curtain of the underground excavation approaching engineering, a welding groove of 60 degrees is arranged between the sections of the steel pipe, a mould is manufactured for welding, and the equal-strength welding requirements of the steel pipe are met; the segmental joints between adjacent pipe curtains on the same underground excavation cross section are staggered, the joint rate is not more than 50%, the pipe curtain steel pipes are constructed by adopting a cutter head retractable micro shield pipe curtain machine (no receiving working well is arranged), the deflection of the pipe curtain steel pipes must be accurately measured and corrected in real time in the pipe curtain construction process, and the maximum deflection is controlled within 10 mm; when the pipe curtain construction penetrates a high risk area, the propelling speed of the pipe curtain machine is strictly controlled, the propelling speed is prevented from being too high, the extrusion effect of the opening section of the cutter head on the stratum is reduced, the propelling needs to be slowed down and continued, and meanwhile, the abnormal shutdown of the pipe curtain machine at the section is avoided.
The step 2-1-2 specifically comprises:
2-1-2-1: the joints between the adjacent small-caliber pipe curtain steel pipes in the cross section of the same underground excavation approach project are staggered in a sectional mode, and the joint rate is not more than 50%.
The step 3 specifically comprises the following steps:
3-1: grouting steel floral tubes are welded on two sides of the small-caliber pipe curtain steel tube;
3-2: and carrying out grouting lap joint on the adjacent small-caliber pipe curtain steel pipes by using the grouting steel floral pipes.
In this embodiment, an advanced pre-support construction method for a small-bore pipe curtain of an underground excavation close-proximity project is provided, where a grouting steel floral tube is welded to a small-bore pipe curtain steel pipe, and the grouting steel floral tube is finished when the small-bore pipe curtain steel pipe joints leave a factory, and the diameter, the wall thickness, the length of the pipe joint, the diameter, the wall thickness, and the welding position with the pipe curtain steel pipe are determined, so that standardized production of the small-bore pipe curtain pipe joints is completed in a factory, grouting steel floral tube setting is completed simultaneously when small-bore pipe curtain construction is performed, and grouting lap joint construction is completed from the grouting steel floral tube on the exposed small-bore pipe curtain pipe joints by using a grouting machine for high-pressure grouting after the small-bore pipe curtain steel pipe construction is completed.
The step 4 specifically comprises the following steps:
4-1: and after the steel pipes at the initial ends are connected with the steel bars of the pipe curtain plugging wall in a welding manner, the exposed parts of the small-caliber pipe curtain steel pipes are poured to form an integral support with the pipe curtain plugging wall so as to complete pre-support.
In the embodiment, in the advanced pre-support construction method of the small-caliber pipe curtain of the underground excavation close-up project, a pipe curtain steel pipe at the starting end of the pipe curtain is properly exposed at a support structure of a construction vertical shaft, and is effectively welded with a pipe curtain plugging wall steel bar, and the exposed pipe curtain steel pipe is poured in the pipe curtain plugging wall; the pipe curtain blocking wall reinforcing steel bars are effectively welded with the supporting steel framework of the construction shaft so as to form an integral supporting pipe curtain with the supporting structure at the starting end of the pipe curtain.
Example 2:
the invention provides a small-caliber pipe curtain advanced pre-support structure for underground excavation close-up engineering, which comprises a small-caliber pipe curtain steel pipe 1, a grouting steel floral pipe 2, pea gravel concrete 3, a construction shaft support 4 and a pipe curtain blocking wall 5, wherein the small-caliber pipe curtain steel pipe 1 is arranged outside an excavation contour line of an underground excavation tunnel, the small-caliber pipe curtain steel pipe 1 is filled with the pea gravel concrete 3 in a pressure filling manner, the grouting steel floral pipe 2 with the same length as the small-caliber pipe curtain steel pipe 1 is welded on two sides of the small-caliber pipe curtain steel pipe 1, the starting end of the small-caliber pipe curtain steel pipe 1 is provided with the pipe curtain blocking wall 5, the pipe curtain blocking wall 5 is arranged inside the construction support 4 and forms a whole body, after the pipe curtain construction is finished, the pipe curtain blocking wall 5 is arranged at the starting end of the pipe curtain and forms a support pipe curtain whole curtain with the construction shaft support 4, as shown in fig. 4, the construction shaft support removal range 6 is removed, and the construction of the underground excavation preliminary support 7 and the secondary lining 8 is started.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (5)
1. A method for advanced pre-support construction of a small-caliber pipe curtain of a subsurface excavation approaching engineering is characterized by comprising the following steps:
determining an initial end of the small-caliber pipe curtain construction of the underground excavation approaching engineering;
arranging a construction vertical shaft support after a construction vertical shaft is downwards arranged on the ground to serve as a subsurface excavation construction working well;
the underground excavation construction working well is used as an initial end of the small-caliber pipe curtain construction of the underground excavation approaching engineering;
arranging a small-caliber pipe curtain steel pipe along the outer side of the excavation contour line of the underground tunnel at the initiating end;
carrying out grouting lap joint on the small-caliber pipe curtain steel pipe;
grouting steel floral tubes are welded on two sides of the small-caliber pipe curtain steel tube;
carrying out grouting lap joint on adjacent small-caliber pipe curtain steel pipes by using the grouting steel floral pipes;
arranging a pipe curtain plugging wall at the initiating end to complete pre-support;
after the steel pipes at the initial ends are connected with the steel bars of the pipe curtain plugging wall in a welding mode, the exposed parts of the small-caliber pipe curtain steel pipes are poured to form integral support with the pipe curtain plugging wall so as to complete pre-support.
2. The method of claim 1, wherein said positioning small bore tubular steel sheet at said originating end along an outside of an excavation contour of the undercut tunnel comprises:
arranging a small-caliber pipe curtain steel pipe along the outer side of the excavation contour line of the underground excavation tunnel;
and (5) performing pressure irrigation filling on the small-caliber pipe curtain steel pipe by using pea gravel concrete.
3. The method of claim 2, wherein the step of arranging the small-caliber pipe-curtain steel pipes along the outer side of the excavation outline of the underground tunnel comprises the steps of:
constructing and arranging a small-caliber pipe curtain steel pipe by using a cutter head retractable type micro shield pipe curtain machine;
welding grooves are formed among the small-caliber pipe curtain steel pipe segments, and a mould is manufactured according to the welding grooves for welding;
wherein, utilize the little shield pipe curtain machine of cutter disc formula of can backing back to construct and set up small-bore pipe curtain steel pipe and do not set up the camber angle and level and beat and establish.
4. The method of claim 3, wherein the welding according to the welding groove manufacturing mold comprises:
the joints between the adjacent small-caliber pipe curtain steel pipes in the cross section of the same underground excavation approach project are staggered in a sectional mode, and the joint rate is not more than 50%.
5. The advanced pre-support structure for the small-caliber pipe curtain of the underground excavation close-up project is characterized by comprising a small-caliber pipe curtain steel pipe (1), grouting steel floral tubes (2), pea gravel concrete (3), a construction shaft support (4) and a pipe curtain blocking wall (5), wherein the small-caliber pipe curtain steel pipe (1) is arranged outside an excavation contour line of the underground excavation tunnel, the small-caliber pipe curtain steel pipe (1) is filled with the pea gravel concrete (3) in a pressure filling manner, the grouting steel floral tubes (2) which are as long as the small-caliber pipe curtain steel pipe (1) are welded on two sides of the small-caliber pipe curtain steel pipe (1), and the grouting steel floral tubes are used for performing grouting lap joint on the adjacent small-caliber pipe curtain steel pipes; a pipe curtain plugging wall (5) is arranged at the initial end of the small-caliber pipe curtain steel pipe (1), and the pipe curtain plugging wall (5) is arranged inside the construction shaft support (4) to form a whole;
after the steel pipes at the initial ends are connected with the steel bars of the pipe curtain plugging wall in a welding mode, the exposed parts of the small-caliber pipe curtain steel pipes are poured to form integral support with the pipe curtain plugging wall so as to complete pre-support.
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| CN202210440875.8A CN114542091B (en) | 2022-04-26 | 2022-04-26 | Advanced pre-support construction method and structure for small-caliber pipe curtain of underground excavation close-connection project |
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| CN202210440875.8A CN114542091B (en) | 2022-04-26 | 2022-04-26 | Advanced pre-support construction method and structure for small-caliber pipe curtain of underground excavation close-connection project |
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| JP3324513B2 (en) * | 1998-06-26 | 2002-09-17 | 株式会社栗本鐵工所 | How to lay a conduit that penetrates the embankment without excavation |
| CN101737060B (en) * | 2009-12-28 | 2011-08-10 | 中铁二局股份有限公司 | Beneath-soil through-tunnel superlarge diameter pipe curtain construction method |
| CN103276741B (en) * | 2013-05-28 | 2015-08-26 | 中铁一局集团有限公司 | Horizontal steel tube occlusion antipriming pipe curtain and construction method thereof |
| CN103485790A (en) * | 2013-10-11 | 2014-01-01 | 中交第二公路勘察设计研究院有限公司 | Shallow tunneling method for pipe-proof-supporting structure combined system |
| CN104500085B (en) * | 2014-12-19 | 2016-08-24 | 北京首尔工程技术有限公司 | A kind of screw conveyor is with pipe jacking tube curtain machine |
| CN105257299B (en) * | 2015-11-04 | 2017-05-17 | 中铁十八局集团有限公司 | Slurry-balanced pipe jacking machine receiving device and technology under high water condition |
| CN109555540B (en) * | 2017-09-27 | 2021-06-08 | 上海同吉建筑工程设计有限公司 | Tunnel type prestressed pipe curtain structure and construction method |
| CN213088018U (en) * | 2020-05-27 | 2021-04-30 | 中交隧道工程局有限公司 | Shield constructs down and wears building to prevent supporting construction of settlement control |
| CN111997646A (en) * | 2020-09-27 | 2020-11-27 | 中铁第四勘察设计院集团有限公司 | Mine method tunnel supporting structure for running high-speed rail through lower part and construction method thereof |
| CN113153355B (en) * | 2021-04-26 | 2023-09-08 | 中铁建大桥工程局集团第五工程有限公司 | Construction method for advanced pipe curtain of underpass tunnel |
| CN113914898B (en) * | 2021-09-30 | 2023-09-29 | 中铁三局集团有限公司 | Advanced support construction method before underground excavation of horsehead door entering tunnel |
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