Construction method applied to frozen shaft safe and rapid excavating large and thick expansive clay layer

A technology of expanded clay and construction method, which is used in earth-moving drilling, shaft equipment, well sinking, etc., can solve the problems of complex stress structure and large borehole wall stress, and achieves economical efficiency, improved work efficiency and cost saving. Effect

Inactive Publication Date: 2017-05-31
CHINA RAILWAY 18TH BUREAU GRP CO LTD
View PDF7 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the frozen wall is thawed, the well wall

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Construction method applied to frozen shaft safe and rapid excavating large and thick expansive clay layer
  • Construction method applied to frozen shaft safe and rapid excavating large and thick expansive clay layer
  • Construction method applied to frozen shaft safe and rapid excavating large and thick expansive clay layer

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0015] Such as figure 1 Said, the present invention is a new technology applied to the construction of freezing shafts safely and quickly through the huge thick expanded clay layer, which is carried out according to the following steps: (1) Determine the center and outer edge of the main and auxiliary shafts according to the design drawings, and mark them with white gray. ②According to figure 1 The layout of the main and auxiliary shaft freezing holes in the plan view of the main row of holes, the middle row of holes, the layout of the hole diameter, the number of holes, the opening spacing and other data accurately determine the drilling position, and draw a circle with red paint. Drill holes according to the freezing depth in the main and auxiliary shaft freezing hole layout parameter design table in Table 1. ③Drilling is completed, check each hole to see if it meets the requirements. ④After the drilling inspection meets the requirements, install the freezing pipe (specific...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

Disclosed is a construction method applied to frozen shaft safe and rapid excavating large and thick expansive clay layer. According to a design drawing, main and auxiliary shaft centers and periphery are determined and are marked by lime. Data including arranged circle diameters, hole number, hole spacing and the like of main drain holes, middle drain holes and rip spalling resistance holes are arranged by main and auxiliary shaft freezing holes, and drilling position is determined. In the process of carrying out freezing, the salt water temperature and the salt water cycling speed are controlled, and the frozen wall expansion speed, thickness and shaft wall temperature are controlled to achieve freezing infirmly and excavating safely. The main drain holes are used for ensuring the frozen wall to meet the requirements that circular part connection perfectly is achieved and a bedrock weathering section is frozen, and at the same time, play the roles of increasing the thickness of the frozen wall, lowering the average temperature of the frozen wall, enhancing the intensity and stability of the frozen wall with the middle drain hole collectively, and the middle drain hole also plays the role of enhancing the stability of the shaft wall under the rip spalling resistance holes. Thus, the shaft excavation speed is increased, the construction efficiency is improved significantly, the construction period is greatly shorten, the expense is saved and the economy is good.

Description

technical field [0001] The invention relates to a new technology for freezing construction of extremely thick and large expansive clay layers of shafts, in particular to a new technology for safe and rapid excavation of frozen shafts through extremely thick and large expansive clay layers. Background technique [0002] Frozen vertical shafts pass through extremely thick layers of large expansive clay, such as the main shaft and auxiliary shaft of Litang Mine in Fengxian County, Jiangsu Province. The depth of the well is -320.5~-422.0m, and the depth of the auxiliary well is -323.2~-423.8m. The thickness of the continuous clay layer reaches 101.5m and 100.6m respectively. Viscous, the natural expansion rate is 105% to 115%, the frost heaving force is 0.4 to 0.5MPa, and the frost heaving rate is 2.09% to 2.65%. The quality of freezing control is very important. Too solid freezing can guarantee construction safety, but the excavation speed is too slow and the cost will increas...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): E21D1/12E21D1/03
CPCE21D1/12E21D1/03
Inventor 张馨
Owner CHINA RAILWAY 18TH BUREAU GRP CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products