CN-121976805-A - Shaft joint construction method

CN121976805ACN 121976805 ACN121976805 ACN 121976805ACN-121976805-A

Abstract

The invention discloses a shaft joint construction method, and relates to the technical field of shaft construction. The method comprises the steps of firstly preparing construction, selecting a reverse well drilling machine to perform wellhead positioning and leveling of the reverse well drilling machine, secondly constructing guide holes, forming the guide holes penetrating through the upper horizontal plane and the lower horizontal plane of a vertical shaft by adopting graded drilling, thirdly performing hole-expanding, drilling and blasting operation, performing sectional and layered hole-expanding on the whole section of the vertical shaft from top to bottom by taking the guide holes as the center, fourthly performing primary support, synchronously supporting an expanding and digging surface every layer in the sectional and layered expanding and digging, and fifthly performing secondary support, and performing secondary support on the wall surface of the vertical shaft by adopting a sliding mode from bottom to top after the expanding and primary support is constructed to the bottom of the vertical shaft. The invention adopts a mode of combining the guide hole of the well reversing drill with the artificial expansion and excavation, solves the problems of ventilation, drainage and slag discharge existing in the artificial expansion and excavation in advance, and greatly shortens the time of the supporting procedure by combining the sliding mode bottom-up secondary lining technology.

Inventors

XIANG SHIDONG
CHEN YUNBO
Su Xingke
JIANG JUN
Li Buhua
LI SHAOGUI
LIU BO
XIAO YAN
GUO RUI
ZHOU QIN

Assignees

攀钢集团四川成物智服产业有限公司

Dates

Publication Date: 20260505
Application Date: 20260325

Claims (5)

1. The shaft joint construction method is characterized by comprising the following steps of: Step one, preparing construction, namely selecting a well reversing drilling machine, positioning a wellhead and leveling the well reversing drilling machine; step two, constructing guide holes, namely forming the guide holes penetrating through the upper horizontal plane and the lower horizontal plane of the vertical shaft by adopting graded drilling; step three, performing expanding excavation construction, performing expanding side drilling and blasting operation, and performing shaft full-section zoning and layered expanding excavation by taking the guide hole as a center from top to bottom; Step four, carrying out primary support, wherein each layer of expansion and excavation in the partitioned layered expansion and excavation is used for synchronously supporting the expansion and excavation surface; And fifthly, carrying out secondary support on the wall surface of the vertical shaft by adopting a sliding mode from bottom to top after the expanding excavation and the primary support construction are carried out on the bottom of the vertical shaft.
2. The shaft joint construction method of claim 1, wherein in the second step, the diameter of the guide hole is 2.5m, the verticality of the drill hole is monitored in real time, the verticality of the guide hole is detected every 5m of the drill hole, the verticality of the guide hole is not more than 1 per mill, drilling parameters are adjusted according to stratum lithology, the drilling speed of a middle hard stratum is controlled to be 0.8-1.2 m/h, the drilling speed of the hard stratum is controlled to be 0.3-0.6 m/h, the drilling pressure is controlled to be 15-25 MPa, the rotating speed is controlled to be 20-30 r/min, and slurry is continuously injected in the drilling process.
3. The shaft joint construction method of claim 1, wherein in the step three, the enlarging and excavating height of each layer is controlled to be 2.0-2.5 m in enlarging and excavating construction, after a guide hole is communicated, air quality is detected through ventilation of the guide hole, then a drainage pipeline is installed to control the underground water level to be more than 1m below an excavating surface, quincuncial blast hole arrangement is adopted in drilling and blasting, the depth of the blast holes is 1.8-2.2 m, the distance between the blast holes is 0.8-1.0 m, the row distance between the blast holes is 1.0-1.2 m, ventilation is carried out for 15-25 min after blasting, and blasted slag stone falls into a tunnel at the lower part of a shaft through the guide hole and is transported out through transportation equipment.
4. The shaft joint construction method of claim 1, wherein in the step four, the excavation face pumice stone is cleaned firstly and surrounding rock is loosened during primary support, then a reinforcing mesh is paved, C25 concrete is sprayed finally, the diameter of the reinforcing mesh is 6-8 mm, the mesh size of the reinforcing mesh is 150mm multiplied by 150mm, the reinforcing mesh is fixed by adopting a screw-thread steel anchor rod, the depth of the anchor rod penetrating into the surrounding rock is not less than 2.0m, and the spraying thickness of the concrete is 100-120 mm.
5. The method for combined construction of shafts according to claim 1, wherein in the step five, floating dust and sundries on the surface of the primary support are cleaned and flatness is treated firstly during secondary support, then a slip form device is installed, layered casting is carried out by adopting C30 concrete, maintenance is carried out for at least 14 days after casting is completed, the slip form device is removed when the strength of the concrete reaches more than 75% of the design strength, the casting thickness is 300-500 mm, and the slip form lifting speed is 0.5-0.8 m/h.

Description

Shaft joint construction method Technical Field The invention relates to the technical field of shaft construction, in particular to a shaft joint construction method. Background Shaft engineering is a key underground structure in the fields of mines, water conservancy, traffic and the like. The traditional shaft construction generally adopts a construction method of short digging and lining, the manual drilling and blasting footage of the construction method is controlled to be about 1.5m, manual or common mechanical slag tapping is adopted, and the primary and secondary lining support is carried out with cyclic footage for every tunneling, so that the construction method has the defects of slow progress, high safety risk, high labor intensity, high construction cost and the like. The Chinese patent application with the publication number of CN120759588A discloses a shaft excavation construction method, which comprises the following construction steps of S1, constructing an upper flat tunnel to the bottom of the first shaft to be excavated to form a first cross section, constructing a lower flat tunnel to the bottom of the second shaft to be excavated to form a second cross section, S2, reserving a section of the lower part of the first shaft to be excavated as a protection section, constructing a positive well method to the top of the protection section on the top of the first shaft to be excavated, constructing a slag chute guide well downwards along the axis of the second shaft to be excavated by adopting a reverse well method, S3, constructing the protection section to the first cross section by adopting the positive well method after the completion of the slag chute guide well construction, S4, constructing the second shaft to be excavated to the second cross section by adopting the reverse well method. The technical scheme of the patent adopts a positive well method and a well-forming method to construct a vertical well, and the reverse well method adopts a reverse well drilling machine which can efficiently form a guide hole, but has limited large-caliber primary well-forming capability and high cost, and is generally suitable for open wells which are not supported. Disclosure of Invention The invention aims to solve the technical problem of providing a shaft joint construction method capable of shortening the shaft construction period and improving the construction safety. The technical scheme adopted by the invention for solving the technical problems is that the shaft joint construction method comprises the following steps: Step one, preparing construction, namely selecting a well reversing drilling machine, positioning a wellhead and leveling the well reversing drilling machine; step two, constructing guide holes, namely forming the guide holes penetrating through the upper horizontal plane and the lower horizontal plane of the vertical shaft by adopting graded drilling; step three, performing expanding excavation construction, performing expanding side drilling and blasting operation, and performing shaft full-section zoning and layered expanding excavation by taking the guide hole as a center from top to bottom; Step four, carrying out primary support, wherein each layer of expansion and excavation in the partitioned layered expansion and excavation is used for synchronously supporting the expansion and excavation surface; And fifthly, carrying out secondary support on the wall surface of the vertical shaft by adopting a sliding mode from bottom to top after the expanding excavation and the primary support construction are carried out on the bottom of the vertical shaft. The method comprises the following steps of carrying out real-time monitoring on the verticality of a drilling hole in the drilling process, carrying out verticality detection every 5m of drilling hole, adjusting drilling parameters according to stratum lithology, controlling the drilling speed of a middle hard stratum to be 0.8-1.2 m/h, controlling the drilling speed of the hard stratum to be 0.3-0.6 m/h, controlling the drilling pressure to be 15-25 MPa, controlling the rotating speed to be 20-30 r/min, and continuously injecting slurry in the drilling process. The method is characterized by comprising the following steps of controlling the expansion and excavation height of each layer to be 2.0-2.5 m in expansion and excavation construction, detecting air quality through ventilation of a guide hole after the guide hole is communicated, installing a drainage pipeline to control the underground water level to be more than 1m below an excavation surface, arranging quincuncial blastholes in drilling and blasting, enabling the depth of the blastholes to be 1.8-2.2 m, enabling the distance between the blastholes to be 0.8-1.0 m, enabling the arrangement distance between the blastholes to be 1.0-1.2 m, ventilating 15-25 min after blasting, enabling blasted slag stones to fall into a tunnel at the lower part of a vertical shaft thr