Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A construction method for excavation and support of cross openings with holes first and then walls

A construction method and intersection technology, applied in earthwork drilling, shaft equipment, wellbore lining, etc., can solve problems such as the stability of surrounding rock at intersections without a systematic solution, so as to avoid backfilling concrete, save construction period and engineering cost, and reduce The effect of over digging

Active Publication Date: 2020-12-29
POWERCHINA HUADONG ENG COPORATION LTD
View PDF11 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first excavation method is more commonly used, and there is no systematic solution for the second excavation method to solve the problems of intersection excavation formation and surrounding rock stability

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
  • A construction method for excavation and support of cross openings with holes first and then walls
  • A construction method for excavation and support of cross openings with holes first and then walls
  • A construction method for excavation and support of cross openings with holes first and then walls

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] Such as figure 1 As shown, the excavation and support construction method of a hole-first and wall-type intersection of the present invention is used for excavation and support of large-scale underground caverns and tunnel intersections. During the excavation of the upper part of the cavern, simultaneously Excavation and support of the lower tunnel 11. exist figure 1 Among them, the reference numeral 21 represents the excavated section of the cavern, and the reference numeral 22 represents the unexcavated section of the cavern.

[0016] After the permanent section 11 of the tunnel is excavated to the designed structural surface of the side wall of the cavern, the reinforced concrete spraying layer 6 and the system anchor rod 53 shall be constructed on the side arch of the tunnel in time to complete the system spraying, anchoring and netting support, and then according to the size of the tunnel section Continue to excavate into the cavern to form a tunnel extension sec...

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

The invention provides a tunnel-before-wall-type crossed tunnel portal excavation supporting construction method. A tunnel is excavated before cavern side walls, after system supporting is completed,the tunnel extends into a cavern, temporary supporting is conducted to ensure site construction safety, locked anchor bars and countersunk anchor bars are implemented to protect intersections, pre-splitting holes are formed in the circumferential direction along the cavern side walls for blasting, rock mass, nearby the intersections, inside and outside the cavern side walls is separated, during later excavation of the cavern, the rock mass within the pre-splitting range is mechanically excavated, secondary blasting damage is avoided, and system supporting follows till the intersections are excavated. A scheme for solving the problem of excavation supporting of the large underground cavern intersections is provided for a tunnel-before-wall-type excavation mode, excavation forming of the intersections can be ensured to a great extent, stability of surrounding rock of the tunnel intersections and the cavern high side walls is facilitated, overexcavation is reduced, later backfilling of alarge amount of concrete is avoided, the construction period is shortened, and the engineering cost is saved.

Description

technical field [0001] The invention relates to a construction method for excavating and supporting a cross opening with a hole first and a wall behind, which is suitable for underground engineering fields such as hydropower and water conservancy. Background technique [0002] In modern hydropower and water conservancy projects, the caverns in the underground powerhouse area are huge, and the height of the main powerhouse and tailwater surge chamber is often hundreds of meters. The diversion tunnel, busbar tunnel, and tailwater tunnel intersect with it, and the height generally exceeds 15-20m. And the number is very large, forming a large number of tunnel entrance and exit intersections. These large intersections are subjected to complex forces, coupled with unfavorable factors such as large differences in geological conditions and high ground stress. After excavation, problems such as relaxation and collapse of surrounding rocks are more serious. The excavation is serious a...

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
Patent Type & Authority Patents(China)
IPC IPC(8): E21D13/02E21D20/00E21D11/10
CPCE21D11/10E21D13/00E21D20/00
Inventor 王鹏石安池李孙权唐鸣发周光辉王敬勇
Owner POWERCHINA HUADONG ENG COPORATION LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com