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Construction method for large-size deep water foundation of rock riverbed

A deep-water foundation and construction method technology, applied in the direction of basic structure engineering, protection devices, buildings, etc., can solve the problems of difficult construction of submerged caps

Active Publication Date: 2018-01-23
NO 1 ENG LIMITED OF CR20G
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, when the caps are large in size and buried deep, the caps are located below the river bed surface, and the river bed has no covering layer and the bedrock is exposed, the construction of the caps in water is very difficult.

Method used

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Examples

Experimental program
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Embodiment Construction

[0128] Such as figure 1 A kind of rock river bed large-volume deep-water foundation construction method shown, combined Picture 1-1 , Figure 1-2 , the large-volume deep-water foundation constructed includes a submerged cap 33, a plurality of vertically arranged bored piles 17 that support the submerged cap 33, and a concrete pier 40 located on the submerged cap 33, the submerged cap 33 is a reinforced concrete cap that adopts steel cofferdam 1-4 to form; the steel cofferdam 1-4 is supported on the rocky riverbed 5, and the described bored pile 17 is a reinforced concrete pile and it is placed in the rocky riverbed 5 Hard Rock 18 on;

[0129] When constructing the large-volume deep-water foundation, the process is as follows:

[0130] Step 1, cofferdam construction, including the following steps:

[0131] Step 101, foundation pit excavation: excavate the underwater foundation pit 15 for placing steel cofferdams 1-4 on the rocky riverbed 5;

[0132] Step 102, cofferdam co...

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Abstract

The invention discloses a construction method for a large-size deep water foundation of a rock riverbed. The construction method comprises the following steps of: step I, cofferdam construction; stepII, steel casing dropping; step III, cofferdam bottom-sealing construction; step IV, drilling pile construction, wherein when any drilling pile is constructed, the step IV comprises the following steps of: 401, lead-hole drilling; and 402, drilling pile construction; step V, water pumping in cofferdam and steel casing cut-off; step VI, bearing platform construction; and step VII, concrete pier construction. According to the construction method disclosed by the invention, a plurality of lead holes are drilled in a hard rock on which the drilling pile is located from top to bottom, so that the hard rock on which the drilling pile is located forms sieve holes for increasing rock crack surfaces, and therefore, a deep water foundation construction process can be simply and quickly completed.

Description

technical field [0001] The invention belongs to the technical field of bridge construction, and in particular relates to a large-volume deep-water foundation construction method on a rocky river bed. Background technique [0002] With the development of the national economy, my country's railway bridge industry is developing rapidly. my country's bridge design theory, construction technology and equipment are catching up with or approaching the world's advanced level, and the construction of long-span sea-crossing and river-crossing bridges continues to increase. The deep-water foundation with a size of 30.25m×19.75m×5m for the main pier cap is currently the largest deep-water foundation for railway projects on inland waterways. The use of double-wall steel cofferdams for underwater foundation construction has become the main method for large-volume deep-water foundation construction for modern long-span bridges. The construction of double-wall steel cofferdams needs to ada...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D27/52E02D27/42E02D27/14E02D19/04E02D19/16E02D31/02
Inventor 梁之海杜越刘俊斌赵久远朱山山严朝锋王永丽李东牛
Owner NO 1 ENG LIMITED OF CR20G
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