Method for constructing special shaped deepwater cofferdams on steep rocky riverbeds

A construction method and technology of cofferdam, applied in the direction of infrastructure engineering, construction, etc., to achieve the effect of high construction feasibility and low construction cost

Active Publication Date: 2012-07-04
ANHUI HIGHWAY BRIDGE ENG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the constraints of bridge line position, bridge type, span, cost and other factors, the above situation is sometimes unavoidable, that is, sometimes it is unavoidable to set up cofferdams on steep slopes or rocky riverbeds
And there is no reliable construction method in the prior art that can carry out construction under this condition

Method used

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  • Method for constructing special shaped deepwater cofferdams on steep rocky riverbeds
  • Method for constructing special shaped deepwater cofferdams on steep rocky riverbeds
  • Method for constructing special shaped deepwater cofferdams on steep rocky riverbeds

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Embodiment Construction

[0022] This example is in figure 1 The environment shown requires the construction of bridge foundations 5, figure 1 Among them, the riverbed below the water level 2 is a rocky riverbed, that is, the rock mass 3. The rock quality of the rock mass 3 is relatively hard, and the rocky surface of the riverbed 1 has a relatively large slope, so it is not suitable for slotting or other methods to fix the cofferdam wall6.

[0023] see figure 2 and image 3 , the cofferdam in the present embodiment is constructed according to the following steps:

[0024] 1. The prefabricated cofferdam wall 6 is provided with grouting pipes 7 vertically and vertically penetrating through the cofferdam wall 6, and the grouting pipes 7 are spaced and evenly arranged in the cofferdam wall 6;

[0025] 2. Sink the cofferdam wall 6 to the river bed, keep the top of the grouting pipe 7 exposed above the water level 2, and use the grouting pipe 7 to flush the river bed with jet water. The flushing operat...

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Abstract

The invention discloses a method for constructing special shaped deepwater cofferdams on steep rocky riverbeds. The method is characterized by comprising the following steps: preferably selecting a prefabricated cofferdam wall, and arranging a grouting pipe which penetrates through the cofferdam wall up and down along the vertical direction in the cofferdam wall; then sinking the cofferdam wall on the riverbed, exposing the top end of the pipe above the water level, and using the grouting pipe to jet water to wash the riverbed; finally, filling the two sides of the cofferdam wall with broken stones, pouring cement mortar into the bottom of the cofferdam wall and the broken stones via the grouting pipe, draining the water in the cofferdam after the cement mortar and the broken stones are bonded and achieve the strength, and excavating a foundation pit in the absence of water, thus completing construction of bridge foundation. The method can be used for pretreating the riverbed without using equipment and is especially suitable for construction of deepwater cofferdams.

Description

technical field [0001] The invention relates to civil engineering construction, in particular to a cofferdam construction method and a special device during construction. Background technique [0002] At present, when deep-water cofferdams are constructed on rocky riverbeds, due to the hard rock formations, the construction of the cofferdams is quite difficult, such as implantation, sinking into the soil, fixing, and bottom sealing. Therefore, in engineering design, the bridge foundation is usually avoided as far as possible from places where unfavorable geological, topographical, and hydrological conditions coexist, such as deep water, steep slopes, and rocky riverbeds. However, due to the constraints of bridge alignment, bridge type, span, cost and other factors, the above situation is sometimes unavoidable, that is, sometimes it is unavoidable to set cofferdams on steep slopes or rocky riverbeds. And there is no reliable construction method in the prior art that can carr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D19/04
Inventor 戴良军崔林钊陈刚陈雷
Owner ANHUI HIGHWAY BRIDGE ENG CO LTD
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