CN112302680A - Comprehensive construction method for reverse excavation and support for safe and rapid construction of channel structure - Google Patents
Comprehensive construction method for reverse excavation and support for safe and rapid construction of channel structure Download PDFInfo
- Publication number
- CN112302680A CN112302680A CN202011192337.9A CN202011192337A CN112302680A CN 112302680 A CN112302680 A CN 112302680A CN 202011192337 A CN202011192337 A CN 202011192337A CN 112302680 A CN112302680 A CN 112302680A
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- channel
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- excavation
- excavating
- reverse
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Classifications
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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
- E21D9/14—Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D1/00—Sinking shafts
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D5/00—Lining shafts; Linings therefor
Abstract
The invention relates to the technical field of buildings, in particular to a comprehensive construction method for reverse excavation and support for safely and quickly constructing a channel structure, which comprises the steps of firstly, excavating a shaft to a bottom elevation of the uppermost layer of a multi-layer underground excavation channel, closing the bottom temporarily, entering the hole, and excavating the underground excavation channel; secondly, excavating a vertical shaft to a substrate, carrying out permanent bottom sealing, and arranging a plurality of reverse operation surfaces in an upper-layer underground excavation channel; thirdly, sequentially excavating a lower-layer channel by using a reverse operation surface; and step four, repeating the step two to the step three until the channel is communicated. The efficiency of multilayer undercut passageway excavation is improved, avoided excavating the shaft many times, excavated each layer undercut passageway each other in turn many times, be unfavorable for the overall structure stable problem, be applicable to all multilayer undercut passageway constructions, the range of application is very wide.
Description
Technical Field
The invention relates to the technical field of buildings, in particular to a comprehensive construction method for reverse excavation and support for safe and rapid building of a channel structure.
Background
The application of the underground excavated channel in the current rail transit field is gradually increased, and the underground excavated channel is widely applied to air channels, temporary transverse channels, special-purpose channels and the like. The total height of the section of the undercut passage is generally high, and the height of part of the section exceeds 25 m. In order to ensure the ground surface settlement control and the construction safety, the excavation and the support of the structure need to be layered and stepped, the height of each layer is different from 3 m to 5m, some channels even reach 6 layers, the excavation and the support are inconvenient, and certain potential safety hazards exist. The construction method for the underground excavation channel to be safer includes the steps of firstly requiring a vertical shaft to be excavated to a design elevation and permanently sealing the bottom, then erecting a high scaffold, excavating ingate layers from the uppermost layer of the underground excavation channel, and then excavating and supporting all layers of the channel until the excavation and supporting of all the underground excavation channels are completed. However, the method has low construction efficiency on one hand, and on the other hand, the high scaffold erected in the vertical shaft has more nodes and large potential safety hazard of connection, and is not beneficial to slag discharging. Therefore, in actual construction, the vertical shaft is firstly excavated to the bottom elevation of the underground excavation channel on the uppermost layer, the temporary bottom sealing of the vertical shaft is carried out, the horsehead door is arranged on the side wall of the vertical shaft, the vertical shaft enters the channel on the uppermost layer for construction, after the vertical shaft is excavated to be communicated, the temporary bottom sealing of the vertical shaft is broken, the vertical shaft is continuously excavated downwards to the bottom elevation of the negative second-layer channel, the vertical shaft is temporarily sealed, then the negative second-layer underground excavation channel is excavated according to the method, and the rest is done until the construction of the vertical shaft and the underground excavation. Although this method avoids the problem of high scaffold, the shaft needs a plurality of temporary back covers, the temporary back cover structure also needs the same as the permanent back cover structure, the larger amount of waste work and masonry exist, and the construction period is longer (the excavation construction period is up to 330 days according to the excavation footage speed of about 1.5 m/day of the traditional undercut tunnel, a 5-layer undercut tunnel with the length of 100 m). And meanwhile, the vertical shaft is excavated for many times, and underground excavation channels at each layer are excavated for many times, so that the integral stability of the structure is not facilitated. Therefore, based on the existing structure form of the vertical shaft and the multilayer underground excavation channel, a new construction method is sought, a high scaffold is avoided, repeated bottom sealing and channel alternate excavation of the vertical shaft are reduced, and more synchronous excavation operation surfaces are opened up, so that the problems are effectively solved, and the requirements of safe and rapid construction of the vertical shaft and the multilayer underground excavation channel structure are met.
Disclosure of Invention
The invention aims to provide a comprehensive construction method for reversely excavating and supporting the channel structure safely and quickly, which is reasonable in design, aiming at overcoming the defects and shortcomings of the prior art, improves the excavating efficiency of multi-layer underground excavation channels, avoids the problem that the underground excavation channels of each layer are mutually alternated due to the fact that vertical shafts are excavated for multiple times and the underground excavation channels of each layer are excavated for multiple times, is not beneficial to the integral stability of the structure, is suitable for the construction of all the multi-layer underground excavation channels, and has a wide application range.
In order to achieve the purpose, the invention adopts the following technical scheme: the operation steps are as follows:
firstly, excavating a shaft to a temporary bottom sealing hole at the uppermost layer bottom elevation of a plurality of layers of underground excavation channels to excavate the underground excavation channels;
secondly, excavating a vertical shaft to a substrate, carrying out permanent bottom sealing, and arranging a plurality of reverse operation surfaces in an upper-layer underground excavation channel;
thirdly, sequentially excavating a lower-layer channel by using a reverse operation surface;
and step four, repeating the step two to the step three until the channel is communicated.
Furthermore, the passageway be the multilayer undercut passageway, it can dig reverse operation face downwards at every certain distance in upper passageway according to engineering project and provide many places operation face for the excavation of lower floor's undercut passageway.
Furthermore, the reverse operation surface is excavated in the upper-layer channel, provides an operation surface for excavating the lower-layer channel and is used as a soil outlet hole of the lower-layer channel.
After the process is adopted, the invention has the beneficial effects that: the invention provides a comprehensive construction method for reversely excavating and supporting a safe and quick channel structure, which improves the excavating efficiency of multilayer underground excavated channels, avoids the problem that the integral stability of the structure is not facilitated due to the fact that vertical shafts are excavated for multiple times and underground excavated channels of each layer are excavated for multiple times and are mutually alternated, is suitable for the construction of all the multilayer underground excavated channels, and has a wide application range.
Description of the drawings:
FIG. 1 is a construction drawing of a first step in the present invention.
FIG. 2 is a construction drawing of step two in the present invention.
FIG. 3 is a construction drawing of step three in the present invention.
FIG. 4 is a construction drawing of step four in the present invention.
Description of reference numerals:
a vertical shaft 1, a multi-layer underground excavation channel 2 and a reverse operation surface 3.
The specific implementation mode is as follows:
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 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.
As shown in fig. 1 to 4, the following technical solutions are adopted in the present embodiment: the operation steps are as follows:
firstly, excavating a vertical shaft 1 to a temporary bottom sealing position at the uppermost layer bottom elevation of a multi-layer underground excavation channel 2;
step two, after advance support measures are made, arranging a ingate on the side wall of the vertical shaft 1, gradually excavating an uppermost layer channel to a sealing end position or a required position (the underground excavation channel is adopted when being long), then excavating the vertical shaft 1 to a permanent sealing bottom at a final designed height, simultaneously opening a plurality of reverse operation surfaces 3 in the uppermost layer channel, wherein the distance between every two reverse operation surfaces 3 is not less than 15 m;
thirdly, excavating downwards, forwards and backwards from each reverse operation surface 3 and supporting a negative second layer of the underground excavation channel until each reverse operation surface 3 is communicated and simultaneously communicated to the side wall of the vertical shaft 1;
and step four, repeating the step two to the step three until the channel is communicated.
After the process is adopted, the beneficial effects of the specific embodiment are as follows:
1. the traditional multi-layer underground excavation channel construction vertical shaft needs multiple temporary bottom sealing, so that the large waste engineering quantity and masonry exist, and the construction period is long; aiming at the excavation of the multilayer underground excavation channel, a plurality of reverse operation surfaces are simultaneously opened up in the upper layer channel, the negative two layers of the underground excavation channel are excavated downwards, forwards and backwards from each operation surface and supported until each reverse operation surface is communicated, the following layers are repeatedly applied according to the steps, and finally the multilayer underground excavation channel is completely communicated; the problems that the existing multi-layer underground excavation channel construction vertical shaft needs to be temporarily bottomed for multiple times, large waste engineering quantity and masonry exist, and the construction period is long are solved; meanwhile, the problem that the integral stability of the structure is not facilitated due to the fact that vertical shafts are dug for multiple times and underground excavation channels of all layers are dug for multiple times in an alternating mode is solved. The requirements of safe and quick construction of vertical shaft and multi-layer underground excavation channel structures are met;
2. the invention is suitable for all multi-layer underground excavation channel construction and has wide application range.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (3)
1. The comprehensive construction method of the reverse excavation and support for safely and quickly constructing the channel structure is characterized by comprising the following steps of: the operation steps are as follows:
step one, excavating a shaft to a temporary bottom sealing hole at the uppermost layer bottom elevation of a multilayer underground excavation channel to excavate the underground excavation channel;
excavating a vertical shaft to a substrate, permanently sealing the bottom, and arranging a plurality of reverse operation surfaces in an upper-layer underground excavation channel;
step three, sequentially excavating a lower-layer channel by using a reverse operation surface;
and step (IV) repeating the steps (II) to (III) until the channel is through.
2. The comprehensive construction method of the reverse excavation and support for the safe and rapid construction of the channel structure according to claim 1, characterized in that: the passageway be the multilayer undercut passageway, it can dig reverse working face downwards at every certain distance in upper channel according to engineering project plan for the excavation of lower floor undercut passageway provides many places working face.
3. The comprehensive construction method of the reverse excavation and support for the safe and rapid construction of the channel structure according to claim 1, characterized in that: the reverse operation surface is excavated in the upper-layer channel, provides an operation surface for excavating the lower-layer channel and is used as a soil outlet hole of the lower-layer channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011192337.9A CN112302680A (en) | 2020-10-30 | 2020-10-30 | Comprehensive construction method for reverse excavation and support for safe and rapid construction of channel structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011192337.9A CN112302680A (en) | 2020-10-30 | 2020-10-30 | Comprehensive construction method for reverse excavation and support for safe and rapid construction of channel structure |
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| CN112302680A true CN112302680A (en) | 2021-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011192337.9A Pending CN112302680A (en) | 2020-10-30 | 2020-10-30 | Comprehensive construction method for reverse excavation and support for safe and rapid construction of channel structure |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103452561A (en) * | 2013-08-20 | 2013-12-18 | 中铁二局股份有限公司 | Vertical in-tunnel construction method of multilayer transverse channel of underground excavation station of metro, and construction method on east side and west side |
| CN204851266U (en) * | 2015-07-28 | 2015-12-09 | 中铁十八局集团有限公司 | Secretly dig shaft structure directly over station |
| CN105240028A (en) * | 2015-11-18 | 2016-01-13 | 上海市城市建设设计研究总院 | Design method of subway station by adopting undercutting method in soft soil area |
| CN107165641A (en) * | 2017-06-09 | 2017-09-15 | 中国铁建大桥工程局集团有限公司 | High inclination-angle ladder way opposite direction excavating construction method in thin layer breaking up hard rock stratum |
| CN110259490A (en) * | 2019-06-13 | 2019-09-20 | 广州穗岩土木科技股份有限公司 | A kind of Underground Subway Station construction method |
| CN210768766U (en) * | 2019-10-25 | 2020-06-16 | 中建八局轨道交通建设有限公司 | Drainage system for treating stagnant water between underground excavation shaft layers |
-
2020
- 2020-10-30 CN CN202011192337.9A patent/CN112302680A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103452561A (en) * | 2013-08-20 | 2013-12-18 | 中铁二局股份有限公司 | Vertical in-tunnel construction method of multilayer transverse channel of underground excavation station of metro, and construction method on east side and west side |
| CN204851266U (en) * | 2015-07-28 | 2015-12-09 | 中铁十八局集团有限公司 | Secretly dig shaft structure directly over station |
| CN105240028A (en) * | 2015-11-18 | 2016-01-13 | 上海市城市建设设计研究总院 | Design method of subway station by adopting undercutting method in soft soil area |
| CN107165641A (en) * | 2017-06-09 | 2017-09-15 | 中国铁建大桥工程局集团有限公司 | High inclination-angle ladder way opposite direction excavating construction method in thin layer breaking up hard rock stratum |
| CN110259490A (en) * | 2019-06-13 | 2019-09-20 | 广州穗岩土木科技股份有限公司 | A kind of Underground Subway Station construction method |
| CN210768766U (en) * | 2019-10-25 | 2020-06-16 | 中建八局轨道交通建设有限公司 | Drainage system for treating stagnant water between underground excavation shaft layers |
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Application publication date: 20210202 |
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