Karst cave treating method suitable for pile foundation construction in karst area

A treatment method and technology for karst caves, which are applied in the fields of foundation structure engineering, sheet pile wall, soil protection, etc., can solve the problems of complex construction process and high cost, and achieve the effects of stable construction quality, strong operability and short construction period.

Inactive Publication Date: 2018-03-13
上海市建工设计研究总院有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is expensive and the construction process is more complicated

Method used

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  • Karst cave treating method suitable for pile foundation construction in karst area
  • Karst cave treating method suitable for pile foundation construction in karst area
  • Karst cave treating method suitable for pile foundation construction in karst area

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Embodiment 1

[0031] refer to Figure 1 to Figure 4 , this embodiment provides a cave treatment method suitable for pile foundation construction in karst areas.

[0032] The karst cave treatment method suitable for pile foundation construction in karst areas includes the following steps:

[0033] The first step is to drill ahead of the pile position to find out the distribution of karst caves 5 at the pile position;

[0034] In the second step, after the drill hole 1 is drilled to the roof of the karst cave 5, the pile hammer 2 is used to repeatedly drill up and down to break through the roof of the karst cave 5. Once the mud level drops, the water level in the drill hole 1 changes greatly, and the mud consistency occurs. When the drilling speed changes or the drilling speed is significantly accelerated without deviation, it indicates that the pile hammer 2 has passed through the top of the cave 5 and entered the cave;

[0035] The third step is to lift the pile hammer 2;

[0036] The fo...

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Abstract

In order to overcome the adverse effects of pile foundation construction in karst area, reduce the cost of the pile foundation construction and simplify the process of the pile foundation construction, the invention provides a karst cave treating method suitable for the pile foundation construction in karst area. The karst cave treating method suitable for the pile foundation construction in karstarea, which is provided by the invention, comprises the steps of when encountering a karst cave during the pile foundation construction, squeezing rubble and clay into the karst cave, filling the karst cave with the rubble and the clay by utilizing a pile hammer, prepressing and compacting. The karst cave is filled with the rubble and the clay and a support is provided for the pile hammer, so that the situation that the pile hammer deflects for lack of support cannot happen during hammering; in addition, the situation that the bearing capacity of pile foundation is affected for lack of a force transferring layer cannot happen.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering design and construction, in particular to a karst cave treatment method suitable for pile foundation construction in karst areas. Background technique [0002] The geological conditions in karst areas are diverse and extremely complex. During pile foundation construction, due to the large number of karst caves in karst areas, when the pile foundation passes through the hollow karst caves, there is no force-transmitting layer within the karst caves, which may easily cause the skew of the pile hammer. , grout loss, concrete overfilling and other problems affect the construction quality. [0003] In order to overcome the adverse effects of pile foundation construction in karst areas, at present, the main treatment methods include grouting method and steel casing follow-up method. This type of method is expensive and the construction process is relatively complicated. Contents of the inventi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/34E02D3/00
CPCE02D3/00E02D5/34
Inventor 孙海忠董林兵
Owner 上海市建工设计研究总院有限公司
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