Construction method for digging composite environmental protection base of anchorage bar adding rock

A technology of rock bolts and construction methods, which is applied in basic structure engineering, construction and other directions, can solve the problems of increased excavation, insufficient clay layer thickness, manual excavation, etc.

Inactive Publication Date: 2010-04-07
NORTHEAST ELECTRIC POWER DESIGN INST CO LTD OF CHINA POWER ENG CONSULTING GRP
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  • Abstract
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AI Technical Summary

Problems solved by technology

In this area, if the foundation of transmission line towers adopts a large excavation type, it will easily cause large-scale damage to the environment and a large amount of basic engineering materials; For rock foundations, the surface clay needs to be excavated, which also increases the amount of excavation, which is not conducive to environmental protection

Method used

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  • Construction method for digging composite environmental protection base of anchorage bar adding rock
  • Construction method for digging composite environmental protection base of anchorage bar adding rock
  • Construction method for digging composite environmental protection base of anchorage bar adding rock

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Embodiment Construction

[0033] Reference figure 1 , figure 2 , image 3 , Figure 4 , The present invention includes the following steps:

[0034] (1) First use machinery to drill holes 9 on the ground, and after reaching the design depth, insert anchor bars 3, and weld short bars 8 on both sides of the lower ends of the anchor bars;

[0035] (2) Grouting the space around the anchor bar to form the anchor rod 10, if necessary, pressure grouting, the material of the grouting is C25 fine stone concrete or M15 mortar;

[0036] (3) When the concrete slurry has solidified and hardened to 30% of the design strength, start to manually dig the foundation pit soil and reach the design depth;

[0037] (4) After the foundation pit is formed, cut off the hardened concrete around the anchor bar above the bottom of the pit;

[0038] (5) Put the main column reinforcement cage composed of the main reinforcement 5 and the stirrup 6 into the foundation main column reinforcement cage, and tie or weld the anchor reinforcement an...

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Abstract

The invention discloses a construction method for digging a composite environmental protection base of an anchorage bar adding rock, comprising the following steps: firstly, adopting a construction machinery to drill holes on the ground, putting anchorages into holes after designed depth is achieved; grouting gaps around the anchorages; when slurry is solidified and cured to reach 30% of designed strength, artificially digging foundation pit earth body and achieving designed depth; after the foundation pit is shaped, shaving off cured slurry around the anchorages of the parts above the pit bottom; putting a basic main post reinforcement cage composed of a main reinforcement and a stirrup, binding or welding anchorages and the basic main post reinforcement cage into a whole; buckling the screw thread part of the upper part of anchorages with a nut and a spacer; and casting concrete in the foundation pit and simultaneously embedding a foundation bolt. By analytical calculation and experimental verification, the construction method well resists exterior load, and meets the requirement of environmental protection of engineering construction, thereby saving the usage of material, reducing the volume of stone and earthwork, and reducing influence on the environment.

Description

Technical field [0001] The invention relates to the basic field of high-voltage, ultra-high-voltage and ultra-high-voltage transmission line iron towers. Background technique [0002] The State Grid Corporation of China attaches great importance to the environmental protection involved in the construction of power projects, and has raised environmental protection to the level of sustainable development of the State Grid. DL / T5219-2005 "Technical Regulations for Basic Design of Overhead Transmission Lines" requires that the basic design must adhere to the principles of environmental protection and resource conservation, and comprehensive consideration of basic types and design plans based on line topography, construction conditions, and geotechnical engineering survey data , Make the basic design achieve the goal of safety, economy and reason. [0003] As an important part of the overhead transmission line, the tower foundation has a large proportion of its cost, construction perio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D27/42E02D27/50
Inventor 刘洪义张显峰张春奎
Owner NORTHEAST ELECTRIC POWER DESIGN INST CO LTD OF CHINA POWER ENG CONSULTING GRP
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