Primary supporting concrete wet spraying method applied to weak surrounding rock tunnel
A technology of initial support and weak surrounding rock, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve problems such as insufficient strength to meet design requirements, insufficient thickness of shotcrete, and long process time, so as to improve the utilization rate of materials , Improving construction efficiency and progress, simple and convenient operation
Active Publication Date: 2019-12-17
THE SECOND ENG OF THE THIRD ENG GROUP OF CHINA RAILWAY +1
View PDF5 Cites 2 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0003] The purpose of the present invention is to provide a wet spraying method for primary support concrete applied to tunnels with weak surrounding rocks, aiming at solving the problem of long time-consuming and time-consuming procedures for the primary support of tunnel surrounding rocks in the prior art using traditional wet spraying machines. Technical problems such as high elastic rate, uneven surface, insufficient thickness of shotcrete and insufficient strength to meet design requirements
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0030] The technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0031] A wet spraying method for primary support concrete applied to tunnels with weak surrounding rocks, the process flow is as follows Figure 5 shown, including the following specific steps:
[0032] (1) Preparatory work: Pre-install multiple rows of arc-shaped steel arches 1 arranged side by side on the rock face, such as Figure 4 As shown; check the wet spray machine: After the wet spray machine trolley arrives at the site, support the front and...
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
| Property | Measurement | Unit |
|---|---|---|
| slump | aaaaa | aaaaa |
Login to View More
Abstract
The invention discloses a primary supporting concrete wet spraying method applied to a weak surrounding rock tunnel, and belongs to the technical field of tunnel construction. The method comprises thefollowing steps: an arc steel arch frame is mounted on a rock surface beforehand, and a high-pressure air gun is used for cleaning the rock surface; mortar wets a pipe, and is sprayed to the rock surface; a slump test is performed; a curve path is adopted to finish the concrete spraying of the rock surface in a partition mode: arch top-upper step left arch shoulder-upper step left arch foot-archtop-upper step right arch shoulder-upper step right arch foot-arch top-upper step left arch shoulder-lower step left arc foot-arch top-upper step right arch shoulder-lower step right arch foot; the arch top and arch foot construction is performed in a flow mode, so that procedures are tightly joined, and the construction efficiency and progress are improved; and the accelerator mixing amount in concrete in different areas is gradually increased from bottom to top, so that the concrete spraying disability is guaranteed, the material utilization rate is increased, and the construction cost is reduced. A wet spraying machine is used for operation; other equipment and materials have no need to be added; and constructors are simple and convenient to operate.
Description
technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a wet spraying method for primary support concrete applied to tunnels with weak surrounding rocks. Background technique [0002] Weak surrounding rock refers to surrounding rock with weak rock quality, low bearing capacity, developed joints and fissures, and broken structure. The structural surface of the body is weak and easy to slide and collapse. During the construction of the tunnel, for the surrounding rocks of grade III, grade IV and grade V, the surrounding rock and the support jointly bear the mountain pressure, so the quality of the initial support of the tunnel is high. However, at present, the initial support of the surrounding rock of this type of tunnel adopts the traditional wet spraying machine operation method in the early stage of construction, and there are problems such as long process time (>12h), high rebound rate, uneven surface, ...
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
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/10
CPCE21D11/107
Inventor 刘承宏孙伯乐李冰陈宇博王朋马良王晨车继光张奎王颖梅杜博群秘江峰王鹏
Owner THE SECOND ENG OF THE THIRD ENG GROUP OF CHINA RAILWAY