An economical and environment-friendly tunnel shotcrete and its construction technology

A tunnel spraying and environment-friendly technology, used in tunnels, tunnel linings, and earth-moving drilling, etc., can solve the problems of increased water consumption of mixtures, increased concrete viscosity, and poor workability, and can reduce viscosity and improve compactness. , the effect of stable dosage

Active Publication Date: 2022-04-26
GUANGDONG PROVINCIAL CHANGDA HIGHWAY ENG +1
View PDF12 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the stone powder content exceeds a certain limit, with the increase of the stone powder content, the water consumption of the mixture will increase, resulting in an increase in the viscosity of the concrete, poor workability, and increased rebound.

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
  • An economical and environment-friendly tunnel shotcrete and its construction technology
  • An economical and environment-friendly tunnel shotcrete and its construction technology
  • An economical and environment-friendly tunnel shotcrete and its construction technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] Prepare shotcrete according to the following raw materials and dosage. The raw materials are 487kg of cement, 781kg of river sand, 0kg of stone chips, 846kg of small stones, 238kg of water, 0kg of water reducing agent, 0kg of rebound control agent (RC430), and 34kg of accelerator.

[0077] Construction process:

[0078] 1. Construction preparation:

[0079] (1) On-site section inspection: Check the clearance size of the excavated section of the tunnel to avoid under-excavation. Water seepage, dripping and watering in the wet spraying area must be drained.

[0080] (2) Cleaning of the surface to be sprayed: Before spraying concrete construction, use high-pressure wind and water to clean the rock surface in order to improve the adhesion of the sprayed concrete, and at the same time prevent loose stones from falling and hurting people and damaging the wet spraying machine.

[0081] (3) Preparation of the wet spray manipulator: After the wet spray manipulator CIFA is in pl...

Embodiment 2

[0095] Prepare shotcrete according to the following raw materials and dosage. The raw materials are 470kg of cement, 1228kg of river sand, 0kg of stone chips, 450kg of small stones, 170kg of water, 3.6kg of water reducing agent, 2.4kg of rebound control agent (RC430), and 34kg of accelerator.

[0096] Construction process:

[0097] 1. Construction preparation: same as construction preparation in embodiment 1.

[0098] 2. Mixing and transportation:

[0099] (1) Shotcrete is mixed in a forced mixing station outside the tunnel, and the ingredients error: cement, admixture and water ≤ 1%, sand, pebbles, stone chips ≤ 3%, cement, river sand, pebbles, water, The water agent is added to the mixing tank at the same time after metering and weighting. The mixing time of each plate of mixing material from adding water to discharging should not be less than 120s.

[0100] (2) Use a concrete mixer truck to transport to the construction site of the surrounding rock to be sprayed.

[0101...

Embodiment 3

[0103] Prepare shotcrete according to the following raw materials and dosage. The raw materials are 470kg of cement, 0kg of river sand, 1228kg of stone chips, 450kg of small stones, 252kg of water, 4.0kg of water reducing agent, 2.4kg of rebound control agent (RC430), and 34kg of accelerator.

[0104] Construction process:

[0105] 1. Construction preparation: same as construction preparation in embodiment 1.

[0106] 2. Mixing and transportation:

[0107] (1) Shotcrete is concentratedly mixed outside the tunnel using a forced mixing station, and the batching error: cement, admixture and water ≤ 1%, small stones, stone chips ≤ 3%. Cement, stone chips, pebbles, water, and water reducing agent are weighed and added to the mixing tank at the same time and stirred for 30 seconds, then added rebound control agent (RC430) into the mixer tank and stirred for another 90 seconds, because the rebound control agent (RC430 ) has the characteristic of inhibiting the effect of the water r...

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

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
flexural strengthaaaaaaaaaa
flexural strengthaaaaaaaaaa
Login to view more

Abstract

The invention discloses an economical and environment-friendly shotcrete for tunnels, which comprises the following raw materials in parts by weight: 400-500 parts of cement, 550-650 parts of river sand, 550-650 parts of stone chips, 400-500 parts of small stones, and 220-220 parts of water. 250 parts, 3.8-5.7 parts of water reducing agent, 1.4-9.4 parts of rebound control agent, 23-56 parts of quick-setting agent; among them, the particle size of small stones is less than 11mm, and the particle size of stone chips is less than 6mm. RC430 admixture produced by Shibo Chemical Materials Co., Ltd. The invention increases the content of the fine aggregate so that it has enough slurry to wrap the aggregate, thereby improving the compactness of the concrete, ensuring the strength of the concrete, and simultaneously improving the workability of the concrete. The invention also discloses a related construction process, which can reduce environmental pollution caused by waste slag, reduce production costs, and meet the requirements of high efficiency and low carbon in the construction industry.

Description

technical field [0001] The invention relates to the technical field of sprayed concrete production and construction, in particular to an economical and environment-friendly tunnel sprayed concrete and a construction process. Background technique [0002] With the overall development of engineering construction, shotcrete construction technology has been fully applied, especially in the construction of shotcrete for the initial support of tunnels in recent years. Replaced, but the current application of wet shotcrete is still unsatisfactory. Because the construction quality and rebound of shotcrete is a complex comprehensive phenomenon, which is affected by raw materials, mix ratio, equipment performance, construction process control, sprayed surface condition, sprayed thickness, operating technology and operator level. [0003] As far as the current problems of wet sprayed concrete are exposed, there are mainly the following points: First, the strength surplus value is not ...

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): C04B28/04E21D11/10
CPCC04B28/04E21D11/10C04B2111/00155C04B2111/00017C04B14/068C04B18/12C04B2103/302C04B2103/12C04B2103/0068
Inventor 王良国张建胥吉韦伟松李超杰蒋略李峥嵘张海山马宏塬刘俊鹏张荣富王勇王培典韩富庆马增琦娄健郭国和王伟力曾思清孙文晋蔡敏
Owner GUANGDONG PROVINCIAL CHANGDA HIGHWAY ENG
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

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap