CN111677512B - Shaft type diversion tunnel excavation method - Google Patents
Shaft type diversion tunnel excavation method Download PDFInfo
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- CN111677512B CN111677512B CN202010411087.7A CN202010411087A CN111677512B CN 111677512 B CN111677512 B CN 111677512B CN 202010411087 A CN202010411087 A CN 202010411087A CN 111677512 B CN111677512 B CN 111677512B
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- shaft
- axis
- excavation
- boring machine
- slag chute
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- 238000009412 basement excavation Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000002893 slag Substances 0.000 claims abstract description 39
- 238000005422 blasting Methods 0.000 claims abstract description 20
- 238000009434 installation Methods 0.000 claims abstract description 10
- 238000005553 drilling Methods 0.000 claims description 10
- 239000011435 rock Substances 0.000 claims description 3
- 238000005452 bending Methods 0.000 abstract description 18
- 238000010276 construction Methods 0.000 abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D1/00—Sinking shafts
- E21D1/03—Sinking shafts mechanically, e.g. by loading shovels or loading buckets, scraping devices, conveying screws
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B5/00—Artificial water canals, e.g. irrigation canals
- E02B5/02—Making or lining canals
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B9/00—Water-power plants; Layout, construction or equipment, methods of, or apparatus for, making same
- E02B9/02—Water-ways
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D5/00—Lining shafts; Linings therefor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a shaft type diversion tunnel excavation method. The method comprises the following steps: after excavation and support of an upper flat section, a lower flat section and a part of bent sections of a diversion tunnel are completed, an included angle theta larger than zero degree is formed between the axis of a slag chute and the axis of a vertical shaft under the condition that the distance between a guide shaft of a raise boring machine and the structural line of a tunnel vertical shaft is more than or equal to 2m according to the diameter of the tunnel, equipment installation and operation height requirements, the included angle theta between the foundation of the raise boring machine and the horizontal plane is designed to be theta, and subsequent blasting is designed and arranged by adopting a one-shot-one design principle. The invention solves the problem that the diversion tunnel is limited by the space of the upper bending section and the lower bending section, and a large amount of expanding excavation needs to be carried out on the upper bending section and the lower bending section in order to meet the requirements of the installation and the operation height of the raise-hole drill; the slag sliding well axis is adjusted to form an included angle larger than zero with the shaft axis, so that the requirements of the raise boring machine on installation height and running height are met as far as possible, the expanding excavation of an upper bending section and a lower bending section and the backfill in the later period are avoided or reduced, the cost is saved, and the construction period is shortened.
Description
Technical Field
The invention belongs to the technical field of water conservancy construction engineering, particularly relates to the technical field of tunnel excavation in water conservancy construction, and particularly relates to a shaft type diversion tunnel excavation method.
Background
Tunnel excavation is common in hydraulic construction projects. The shaft type diversion tunnel is a key project in the water conservancy construction project, and generally comprises an upper flat section, an upper bent section, a shaft section, a lower bent section and a lower flat section. The construction method of the shaft of the general shaft type water diversion tunnel comprises the following steps: (1) and (5) completing excavation and support of the upper and lower horizontal tunnels and part of the upper and lower bent sections. (2) In order to meet the requirements of the installation and operation of the raise-boring machine, the upper and lower bent sections need to be expanded and dug according to the structural size and the installation and operation height of the raise-boring machine. (3) Pouring the foundation of the raise boring machine, and installing the raise boring machine. (4) The slag sliding well adopts a raise boring machine to vertically drill a guide hole from top to bottom, and then a guide well with a large diameter is reversely expanded. (5) And expanding and digging, drilling and blasting by adopting a hand pneumatic drill, wherein the drilling depth of each cycle is 0.8-1.2 m. And carrying out layering from top to bottom until excavation is finished.
The existing excavation method needs to carry out expanding excavation on the upper and lower bent sections of the diversion tunnel, and concrete backfill is needed subsequently, so that the engineering quantity is increased, and the construction efficiency is low.
Disclosure of Invention
The invention discloses a shaft type diversion tunnel excavation method according to the defects of the prior art. The invention aims to solve the problem of providing the inclined shaft excavation method of the shaft type diversion tunnel, which is limited by the space of the upper bending section and the lower bending section in the diversion tunnel, can reduce the expanding excavation construction and backfilling of the upper bending section and the lower bending section, saves the construction cost and has higher efficiency.
The invention is realized by the following technical scheme:
the shaft type water diversion tunnel excavation method is characterized by comprising the following steps:
(1) completing excavation and support of an upper flat section, a lower flat section and a part of bent sections of the diversion tunnel;
(2) selecting an inclination angle of the shaft line of the slag chute, and enabling the shaft line of the slag chute and the shaft line of the shaft to form an included angle theta larger than zero degree under the condition of ensuring that the distance between a guide shaft of a raise boring machine and the structural line of the tunnel shaft is larger than or equal to 2m according to the diameter of the tunnel and the requirements of equipment installation and operation height;
(3) designing a raise boring machine foundation, wherein in order to realize the inclined included angle theta of the slag sliding well, the raise boring machine foundation is designed to form an included angle theta with the horizontal plane;
(4) constructing and installing a raise boring machine foundation;
(5) optimizing the blasting design, wherein the axis of the slag chute is obliquely crossed with the axis of the vertical shaft, the center of each high-elevation slag chute is changed relative to the center of the vertical shaft, and the blasting design is designed according to a one-shot one-design principle;
(6) expanding and digging, namely drilling and blasting by adopting YT28 hand pneumatic drill, wherein the drilling depth in each cycle is 0.8-1.2 m; and excavating from top to bottom layer by layer until the excavation is finished.
The first blasting design is that blasting design arrangement is carried out according to the plane position of the slag chute, the blasting result of the previous cycle and the surrounding rock condition forecast of the next excavation cycle after each excavation cycle along with the descending of the excavation elevation when the shaft is excavated from top to bottom according to the oblique crossing of the shaft axis of the slag chute and the shaft axis.
The included angle theta formed by the axis of the slag chute and the axis of the vertical shaft is larger than 0 degree and smaller than 60 degrees.
The shaft type diversion tunnel of the invention adjusts shaft slag chute into inclined shaft slag chute so as to obtain the height required by the installation and operation of the raise boring machine. The distance between the inclined slag chute and the water diversion tunnel shaft structure line is guaranteed to be larger than or equal to 2m, and an included angle is formed between the slag chute axis and the water diversion tunnel shaft axis.
The invention has the following differences and advantages over the prior art: 1) the method adjusts the axis of the slag chute to form an included angle with the axis of the shaft under the premise of preventing the slag chute from exceeding the shaft excavation structure line so as to meet the requirements of the raise boring machine on installation height and operation height as much as possible, and the method mainly aims to avoid or reduce expanding excavation of upper and lower bent sections and backfill in the later period for forming the slag chute and save cost. 2) In order to realize the included angle formed between the axial line of the slag chute and the axial line of the vertical shaft, the foundation structure surface of the raise boring machine needs to be poured to form the included angle with the horizontal plane.
Drawings
FIG. 1 is a schematic view of a conventional shaft type diversion tunnel pilot shaft drilling construction;
FIG. 2 is a schematic diagram of the construction of a conventional shaft type diversion tunnel slag chute;
FIG. 3 is a schematic view of the shaft type diversion tunnel pilot shaft drilling construction of the present invention;
FIG. 4 is a schematic view showing the construction of a slag chute of a shaft type water diversion tunnel according to the present invention;
FIG. 5 is a schematic view of the raise boring machine infrastructure of the present invention.
In the figure, 1 is a raise boring machine, 2 is a raise boring machine foundation structure, 3 is a guide shaft, 4 is a slag sliding well, 5 is slag sliding, 6 is a transport vehicle, 7 is a constructor, 8 is a slag sliding well axis, 9 is a shaft axis, 10 is raise boring foundation concrete, 11 is a foundation bolt preformed hole, A is an upper flat section, B is an upper bent section, C is a shaft section, D is a lower bent section, E is a lower flat section, F is an expanding excavation section, and theta is an inclined included angle.
Detailed Description
The present invention is further described below in conjunction with the following detailed description, which is intended to further illustrate the principles of the invention and is not intended to limit the invention in any way, but is equivalent or analogous to the present invention without departing from its scope.
With reference to the attached drawings.
The shaft type water diversion tunnel excavation method comprises the following steps:
(1) completing excavation and support of an upper flat section, a lower flat section and a part of bent sections of the diversion tunnel;
(2) selecting an inclination angle of the shaft line of the slag chute, and enabling the shaft line of the slag chute and the shaft line of the shaft to form an included angle theta larger than zero degree under the condition of ensuring that the distance between a guide shaft of a raise boring machine and the structural line of the tunnel shaft is larger than or equal to 2m according to the diameter of the tunnel and the requirements of equipment installation and operation height;
(3) designing a raise boring machine foundation, wherein in order to realize the inclined included angle theta of the slag sliding well, the raise boring machine foundation is designed to form an included angle theta with the horizontal plane;
(4) constructing and installing a raise boring machine foundation;
(5) optimizing the blasting design, wherein the axis of the slag chute is obliquely crossed with the axis of the vertical shaft, the center of each high-elevation slag chute is changed relative to the center of the vertical shaft, and the blasting design is designed according to a one-shot one-design principle;
(6) expanding and digging, namely drilling and blasting by adopting YT28 hand pneumatic drill, wherein the drilling depth in each cycle is 0.8-1.2 m; and excavating from top to bottom layer by layer until the excavation is finished.
The first blasting design is that blasting design arrangement is carried out according to the plane position of the slag chute, the blasting result of the previous cycle and the surrounding rock condition forecast of the next excavation cycle after each excavation cycle.
The excavation method of the invention is explained below by taking a hydropower station of a certain ditch as an example:
the hydropower station 1# to 4# pressure pipelines are arranged on the left bank of a river channel, the pressure pipelines are arranged in a single-machine single-hole shaft type mode, each pressure pipeline comprises an inlet gradual change section, an upper flat section, an upper bending section, a vertical shaft section, a lower bending section, a lower flat gradual change section and a lower flat section, and the length of each pressure pipeline is 209.97m to 266.84 m. The length of the upper bending section and the lower bending section of the 1# to 4# pressure pipeline is 47.12m, the length of the vertical shaft section is 32.10m, and the upper bending section, the lower bending section and the vertical shaft section are circular sections with the radius of 6.0 m. The slag chute axis and the shaft section axis are designed to form an included angle of 10.18 degrees, after the supporting of the top arch system of the upper bending section above the upper flat section EL.2056.40m of the diversion tunnel is completed, an LM-200 type raise boring machine is firstly installed in the pressure pipeline shaft, an A216mm guide hole is drilled from top to bottom to be communicated with the lower bending section of the pressure pipeline, and then a guide shaft with the diameter of A1.40m is reversely expanded from bottom to top. And excavating the whole section surface of the vertical shaft section from top to bottom by using a YT-28 hand pneumatic drill, and excavating into a ruler by 1.0 m. And when expanding and excavating, expanding and excavating to the designed section from top to bottom and carrying out corresponding system support in time. Compared with the traditional vertical slag chute scheme, the scheme saves excavation and concrete 1757.25m3The investment is saved by tens of thousands yuan, and the technical and economic effects are good.
Claims (3)
1. A shaft type diversion tunnel excavation method is characterized by comprising the following steps:
(1) completing excavation and support of an upper flat section, a lower flat section and a part of bent sections of the diversion tunnel;
(2) selecting an inclination angle of the shaft line of the slag chute, and enabling the shaft line of the slag chute and the shaft line of the shaft to form an included angle theta larger than zero degree under the condition of ensuring that the distance between a guide shaft of a raise boring machine and the structural line of the tunnel shaft is larger than or equal to 2m according to the diameter of the tunnel and the requirements of equipment installation and operation height;
(3) designing a raise boring machine foundation, wherein in order to realize that an included angle theta larger than zero degree is formed between the axis of a slag chute and the axis of a vertical shaft, the raise boring machine foundation is designed to form an included angle theta with a horizontal plane;
(4) constructing and installing a raise boring machine foundation;
(5) optimizing the blasting design, wherein the axis of the slag chute is obliquely crossed with the axis of the vertical shaft, the center of each high-elevation slag chute is changed relative to the center of the vertical shaft, and the blasting design is designed according to a one-shot one-design principle;
(6) expanding and digging, namely drilling and blasting by adopting YT28 hand pneumatic drill, wherein the drilling depth in each cycle is 0.8-1.2 m; and excavating from top to bottom layer by layer until the excavation is finished.
2. The shaft type diversion tunnel excavation method according to claim 1, characterized in that: the first blasting design is that blasting design arrangement is carried out according to the plane position of the slag chute, the blasting result of the previous cycle and the surrounding rock condition forecast of the next excavation cycle after each excavation cycle.
3. The shaft type diversion tunnel excavation method according to claim 1 or 2, characterized in that: the included angle theta formed by the axis of the slag chute and the axis of the vertical shaft is larger than 0 degree and smaller than 60 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010411087.7A CN111677512B (en) | 2020-05-15 | 2020-05-15 | Shaft type diversion tunnel excavation method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010411087.7A CN111677512B (en) | 2020-05-15 | 2020-05-15 | Shaft type diversion tunnel excavation method |
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| Publication Number | Publication Date |
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| CN111677512A CN111677512A (en) | 2020-09-18 |
| CN111677512B true CN111677512B (en) | 2021-11-30 |
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| CN113513324A (en) * | 2021-07-29 | 2021-10-19 | 中国水利水电第六工程局有限公司 | Inclined shaft excavation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101349064B (en) * | 2008-08-26 | 2010-04-07 | 中国水利水电第五工程局 | Construction method of hydroelectric power station surge chamber vertical shaft under soft rock geological condition |
| CN204608810U (en) * | 2015-01-04 | 2015-09-02 | 中国电建集团华东勘测设计研究院有限公司 | For the shaft structure of slagging tap in Excavation of High And Steep Slopes engineering |
| CN105298499A (en) * | 2015-11-12 | 2016-02-03 | 中国水利水电第七工程局有限公司 | Excavation deviation processing method of raise-boring machine for deep vertical shaft |
| CN206957712U (en) * | 2017-06-06 | 2018-02-02 | 中国葛洲坝集团三峡建设工程有限公司 | A kind of anti-well rig guide hole construction system of unfavorable geology layer vertical shaft |
| CN110593880A (en) * | 2019-10-22 | 2019-12-20 | 中国水利水电第六工程局有限公司 | Inclined shaft excavation system and method |
| CN110952986B (en) * | 2019-12-18 | 2021-01-29 | 中国水利水电第五工程局有限公司 | Shaft secondary expanding excavation method based on steel platform |
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