Construction method for narrow-base single-stand-column stepped foundation

A technology of foundation construction and narrow foundation sheet, which is applied in the direction of foundation structure engineering and construction, and can solve problems such as the difficulty of installing and fixing the anchor bolt group, the large and unstable span of the reinforcement cage of the foundation column, and the reduction of the number of steel beams and steel pipes used, etc. Achieve high rigidity and stability

Active Publication Date: 2017-12-15
POWER CHINA HENAN ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: in view of the large base plate area and large excavation area of ​​the narrow foundation single column foundation, the conventional foundation construction formwork support method has problems such as large steel beam span, poor stability, and vertical steel pipe support needs to be installed in the bottom layer, etc. Difficulties in construction, providing a narrow foundation single-column step foundation construction method, which effectively overcomes the problems of no central pile

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0038] Embodiment: A construction method for a narrow foundation single-pillar step foundation, including the following specific steps:

[0039] A. Perform foundation pit inspection and pit bottom trimming: use theodolite to nail the auxiliary corner piles and bisecting piles at the corners of the foundation pit before excavation, and operate the instruments to stake out the angle bisectors and pit corners. Trim the elevation of the bottom of the pit to the design range, and then pour the concrete cushion. The elevation of the bottom of the pit is calculated from the designed center pile elevation plus or minus the foundation lift value to the top of the foundation plus the full height of the foundation to the bottom of the pit. The corner tower needs Considering the increase of the pre-height value, ensure the elevation of the cushion during the cushion casting process, maintain the level of cushion production, reduce the height difference of the cushion, and use wooden strips to...

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Abstract

The invention discloses a construction method for a narrow-base single-stand-column stepped foundation. The construction method comprises the following specific steps of: performing foundation pit checking, performing pit bottom finishing, performing cushion-layer maintenance data lofting, binding, reinforcing a stand column reinforcement cage, positioning a bolt sample plate on the reinforcement cage, fixing a bolt group, performing anti-twisting rigid fixation on the reinforcement cage, mounting and fixing a step template, mounting and fixing a stand column template, performing acceptance inspection before foundation casting, grouting a foundation and correcting track, and inspecting basic data to perform backfill operation. The construction method effectively overcomes the problems that central pile data reference is absent after excavation, the stand column reinforcement cage of the foundation is relatively great in span and is unstable, and a foundation bolt group is difficult to mount and fix, effectively controls an outer deformation condition of the outer surface of a large concrete stand column, smoothly completes a construction task, reduces using quantity of steel beams and steel tubes, is good in data control after section base casting, achieves the very good effect in aspects of a construction process and quality control of the narrow-base single-stand-column stepped foundation, and has a project quality good rate of 98% or more.

Description

1. Technical field: [0001] The invention relates to a construction method of a step foundation with a narrow base and single column, and belongs to the technical field of step foundation construction of power transmission lines. 2. Background technology: [0002] At present, the step foundation design of domestic transmission lines is mostly based on the step type of four separate foundation pits. However, in some special areas, such as Hainan Province in my country, the operating lines often have to be considered to be attacked by strong typhoons, and the tower foundation is required to be relatively strong. Large self-weight and small footprint, so there is a narrow-base single-column stepped foundation. This type of foundation has a large amount of concrete and self-weight, which can ensure the stability of the power transmission tower in extreme weather, and has a small root opening and footprint. Its characteristic is that the foundation column is merged into one from t...

Claims

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Application Information

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IPC IPC(8): E02D27/01E02D27/42
CPCE02D27/016E02D27/42E02D2250/0023
Inventor 宋升华邓帅林庆涛杨侃陶言王嘉宜朱广军宋国锋
Owner POWER CHINA HENAN ENG CO LTD
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