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Construction technology of expressway bridge pile foundation crossing super large and multi-layer karst caves

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

Active Publication Date: 2022-04-05
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 technology of expressway bridge pile foundation crossing super large and multi-layer karst caves
  • Construction technology of expressway bridge pile foundation crossing super large and multi-layer karst caves
  • Construction technology of expressway bridge pile foundation crossing super large and multi-layer karst caves

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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

This application relates to the construction technology of super large and multi-layer karst caves for expressway bridge pile foundations, which belongs to the technical field of construction engineering. Determine the pile position; step 2, the drilling rig is in place to drill the hole, and the appropriate construction method is adopted according to the karst cave conditions detected by the geological radar as follows: advance grouting and coagulation method, backfilling chip and clay repeated punching method, steel casing follow-up method; step 3 1. Inserting the reinforcement cage: hoist the reinforcement cage vertically into the pile hole; step 4, form the pile foundation by grouting the pile hole: use the pouring conduit to extend into the pile hole and grout. This application uses geological radar to detect the condition of the karst cave before construction, grasp the size of the karst cave, and select the construction method according to the condition of the karst cave, so as to reduce the construction phenomena such as stuck drill, dropped drill, buried drill, and collapse during the pile foundation construction process, reduce karst hazards, and ensure The pile foundation project in the karst area proceeded 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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Patent Type & Authority Patents(China)
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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