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Construction process for highway bridge pile foundation to pass through oversized and multi-layer karst cave

A highway and construction technology technology, applied in bridges, bridge construction, infrastructure engineering, etc., can solve the problems of economic loss, long construction period of pile foundation, stuck drill, etc. The effect of drilling

Active Publication Date: 2021-07-02
CHINA RAILWAY GUANGZHOU ENG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Karst landforms widely exist in road and bridge construction. Bridge construction needs to use pile foundations, and some pile foundations need to pass through karst caves. Karst caves cause great harm to the construction of bridge pile foundations. Construction phenomena such as buried drilling and subsidence lead to long construction period, high cost and frequent accidents of pile foundation, which will not only cause huge economic losses, but even endanger the lives of on-site operators

Method used

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  • Construction process for highway bridge pile foundation to pass through oversized and multi-layer karst cave
  • Construction process for highway bridge pile foundation to pass through oversized and multi-layer karst cave
  • Construction process for highway bridge pile foundation to pass through oversized and multi-layer karst cave

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Embodiment 1

[0039] The embodiment of this application discloses the construction technology of expressway bridge pile foundation passing through super large and multi-layer karst caves. Specifically, Yiyi Expressway is taken as an example. Limestone, argillaceous limestone, dolomitic limestone, and marl in the Sichuan-Yunnan boundary on the south side of Guoquanyan, Haoba Town, Lianxian County. The bridge of this project adopts pile foundation, and some pile foundations need to go through the karst cave. refer to figure 1 , the construction process includes the following steps:

[0040] Step 1. Advanced detection:

[0041]Due to the complex stratum structure in karst areas, the development of fissures, and the frequent changes in the location, size, and depth of karst caves, it is difficult to fully investigate the actual karst conditions in the survey and design stage of geological surveys in karst areas, and the survey misjudgment rate is high. Therefore, during the construction proce...

Embodiment 2

[0058] The embodiment of the present application discloses the construction technology of expressway bridge pile foundation passing through super large and multi-layer karst caves. The difference from embodiment 1 is that the construction method in step 2 also includes:

[0059] Spinning pile reinforcement method: Aiming at the collapse of silt layer and round gravel layer, the rotary grouting pile reinforcement scheme is adopted, and the pile points are detected and recorded according to the Rayleigh wave. The vertical and horizontal distance between adjacent pile points is 2m-3m. The alignment of the high-pressure rotary grouting pile machine is adjusted to guide the hole. The drill pipe rotates and drills to 2m below the silt layer and the round gravel layer, then stops, starts to spray grout and rotates and lifts at the same time, and the lifting speed is controlled at 10cm / min-20cm / min. The rotation speed is controlled at 15r / min-20r / min. After the slurry surface no longer...

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Abstract

The invention relates to a construction process for a highway bridge pile foundation to pass through an oversized and multi-layer karst cave, and belongs to the technical field of constructional engineering. The construction process comprises the following construction steps that 1, advanced detection is conducted, the position and the size of the karst cave are detected by adopting a geological radar, and the pile position is determined according to detection data; 2, a drilling machine conducts in-place drilling, and according to the karst cave condition detected by the geological radar, proper construction methods are adopted as follows, an advanced grouting condensation method, a rubble backfilling and clay repeated punching method and a steel casing follow-up method; 3, a reinforcement cage is placed, specifically, the reinforcement cage is vertically hoisted into a pile hole; and 4, pile hole grouting is conducted to form a pile foundation, specifically, a pouring guide pipe is adopted to stretch into the pile hole for grouting. The geological radar is adopted to detect the karst cave condition before construction, the size of the karst cave is mastered, the construction mode is selected according to the karst cave condition, the construction phenomena of drill jamming, drill falling, drill burying, collapse and the like in the pile foundation construction process are reduced, karst harm is relieved, and it is guaranteed that pile foundation engineering in the karst area is conducted smoothly.

Description

technical field [0001] The application relates to the field of construction engineering, in particular to the construction technology of expressway bridge pile foundation passing through super large and multi-layer karst caves. Background technique [0002] Karst is mainly the dissolution effect of groundwater and surface water on soluble rocks. The morphological features of karst mainly include stone buds, karst trenches (troughs), karst pores, karst crevices, underground rivers, karst caves, etc. It is also called karst landform internationally. 70% of my country is mountainous, with complicated geographical conditions. It is the country with the widest distribution of karst in the world, mainly in Guizhou, Sichuan, Guangxi, Yunnan and other places. building. [0003] Karst landforms widely exist in road and bridge construction. Bridge construction needs to use pile foundations, and some pile foundations need to pass through karst caves. Karst caves cause great harm to the...

Claims

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Application Information

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IPC IPC(8): E02D5/38E01D21/00E02D3/08E02D27/12
CPCE02D5/38E01D21/00E02D3/08E02D27/12
Inventor 曹庆中罗玉伟蒋证全李伟许连松黄兴江杨茂平
Owner CHINA RAILWAY GUANGZHOU ENG GRP CO LTD
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