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A grouting method for underwater large-diameter bored piles in corrosion geology

A large-diameter, bored pile technology, which is applied to sheet pile walls, buildings, and foundation structure engineering, can solve problems such as the difficulty in meeting the construction requirements of large-diameter bored piles, and the difficulty in further ensuring the stability of the main tower of the bridge. Conveying stability, good forming effect, uniform and stable conveying effect

Active Publication Date: 2018-12-25
SHANGHAI CIVIL ENG GRP FIFTH +1
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Problems solved by technology

In the pile foundation construction of the main tower of the bridge, in order to ensure the stability of the main tower, it is often necessary to use large-diameter bored piles with large bearing capacity, that is, bored piles with a diameter greater than 2.5 meters. For the construction of large-diameter bored piles, due to the wide river channel and the need to drill holes in rock formations with karst caves and troughs, it is difficult to meet the construction requirements of large-diameter bored piles with existing construction methods, so the stability of the main tower of the bridge sex is also difficult to further guarantee

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  • A grouting method for underwater large-diameter bored piles in corrosion geology
  • A grouting method for underwater large-diameter bored piles in corrosion geology
  • A grouting method for underwater large-diameter bored piles in corrosion geology

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following examples.

[0029] A pouring method for underwater large-diameter bored piles in dissolved geology, comprising the following steps:

[0030] (1) Hole opening: Insert steel casing at the pile position; prepare enough mud, inject mud into the hole of steel casing with mud pump before drilling, then add clay block, and repeat with small stroke with impact cross drill bit Impact the pile position to make slurry, so that the hole wall is solid;

[0031] (2) Drilling into the hole: remove slag in time during the drilling process; mud circulation system is used for slag removal. After the mud is prepared, it enters the mud pool and is sent into the drilled pile, and then circulates out of the drilled hole with drilling slag. The mud and drilling slag pass through the mud separator to separate the...

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Abstract

The invention discloses a grouting method for a corrosion geological underwater large-diameter drilled pile. The grouting method comprises the following steps of: (1) hole opening; (2) drilling to form the hole; (3) hole cleaning; (4) steel reinforcement cage placement, (5) guide tube lowering; (6) first batch concrete grouting, namely hoisting a large hopper, which is connected to the guide tube, onto a guide tube platform; arranging 2-4 concrete tank trucks and 2-4 ground pumps on the shore, wherein pump lines of the ground pumps are connected to the large hopper by means of a temporary floating bridge; the concrete tank trucks deliver concrete to the ground pumps, and the ground pumps pump concrete into the large hopper; after the large hopper is full of concrete, a ball is pulled out; and 2-4 ground pumps are employed to feed concrete at the same time; and (7) subsequent concrete grouting, namely after the completion of first batch concrete grouting, replacing the large hopper by a small hopper having the capacity of 2-5 m3 for grouting to a designed elevation. By means of the grouting method for a corrosion geological underwater large-diameter drilled pile, the construction difficulties of the corrosion geological condition and a wide river channel can be overcome, and the quality of the drilled pile can be improved so as to ensure the stability of the main tower of a bridge.

Description

technical field [0001] The invention relates to the field of bridge construction, in particular to a pouring method for large-diameter bored piles underwater in eroded geological conditions. Background technique [0002] Bored piles are usually made by using a drilling rig to form pile holes in the foundation of the engineering site, and placing steel cages and pouring concrete in the pile holes. In the pile foundation construction of the main tower of the bridge, in order to ensure the stability of the main tower, it is often necessary to use large-diameter bored piles with large bearing capacity, that is, bored piles with a diameter greater than 2.5 meters. For the construction of large-diameter bored piles, due to the wide river channel and the need to drill holes in rock formations with karst caves and troughs, it is difficult to meet the construction requirements of large-diameter bored piles with existing construction methods, so the stability of the bridge main tower ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D5/40E02D15/04E02D15/06
CPCE02D5/40E02D15/04E02D15/06
Inventor 唐俊刘明友翟溯黄忠睦吴宏剑姜杰朱淑兰
Owner SHANGHAI CIVIL ENG GRP FIFTH
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