Construction method of diaphragm wall of barrier body

Abstract

The invention discloses a construction method of a diaphragm wall of a barrier body. The method comprises the following steps: pretreating a stratum with the boulder content higher than 50% and serious overhead of the diaphragm wall of the barrier bod to form a homogenized stratum which is favorable for subsequent diaphragm wall grooving on the stratum; after forming a homogenized stratum, drilling the homogenized stratum by taking the axis of the barrier body impervious wall as a reference to form a slotted hole; after the slotted hole is formed, hanging embedded pipes layer by layer througha cross beam so as to arrange in the slotted hole layer by layer; when each layer of embedded pipes is arranged below, positioning a plurality of embedded pipes in the layer of the embedded pipes simultaneously through an embedded pipe truss which is arranged in the slotted hole together with the layer of embedded pipes; then arranging a pouring guide pipe in the slotted hole; and after the pouring guide pipe is arranged below the slotted hole, pouring concrete into the groove hole through the pouring guide pipe so that the diaphragm wall can be quickly formed in the slotted hole. With the adoption of the method, the diaphragm wall of the barrier body can be quickly and safely build under the geological conditions of a weir plug body which has more boulders, large particle size, serious overhead phenomenon and un-deposited and cemented stratum.

Description

technical field [0001] The invention relates to the field of water conservancy and hydropower engineering, in particular to a construction method for an anti-seepage wall of a dam body. Background technique [0002] The barrier body was formed by earthquake collapse and landslides. Since the improvement of the barrier lake is imminent, the improvement of the barrier body needs to adhere to the working idea of ​​research, design, and treatment at the same time. It is necessary to carry out the implementation of risk reduction and flood control projects such as barrier body improvement as soon as possible. The damming body improvement is to carry out anti-seepage treatment and partial slope surface improvement on the damming body, weir foundation and bank slopes on both sides. The anti-seepage treatment of the damming body adopts the combination of anti-seepage wall and curtain grouting. [0003] For the damming body, previous engineering experience mainly focused on dismantli...

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Problems solved by technology

[0003] For the damming body, previous engineering experience mainly focused on dismantling and diverting water flow. However, for a damming body with a huge volume formed by a super-large collapse, the cost of demolition is very high, and it is difficult to find it near the project site. There are so many accumulations in a suitable site, so if we can make full use of the dams and directly use the dams to form the dam, it will eliminate harm and bring benefits, and turn waste into treasure.

However, for the geology of the dam body where the maximum depth of the cut-off wall exceeds 130m, the thickness of the wall exceeds 1.0m, and the boulder content exceeds 50%, the maximum particle size of the boulder exceeds 15 meters, the overhead phenomenon is serious, and the stratum has not been deposited and cemented. In terms of conditions, these unfavorable conditions have caused great difficulties in the construction of cut-off walls and posed great challenges to existing construction technologies. How to form cut-off walls based on the geological conditions of the above-mentioned dam body has no construction precedents at home and abroad.

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