Cross section-variable underground continuous wall and construction method thereof

Abstract

The invention discloses a cross section-variable underground continuous wall, which is formed by connecting multiple underground continuous walls. The wall bottom of the single underground continuous wall is in a double-step shape along the width direction of a wall body. The invention also discloses a construction method for the cross section-variable underground continuous wall, which comprises the following steps: (a1) measuring the rock depth condition at a construction position to determine the embedded rock depth of the steps at the wall bottom of the single cross section-variable underground continuous wall; (a2) performing construction operation to manufacture an underground continuous wall slot with two steps, wherein the depth of the two steps meets the requirement of the embedded rock depth determined in the step (a1); and (a3) lowering a steel net, and casting underwater concrete to form the cross section-variable underground continuous wall. The wall bottom of the cross section-variable underground continuous wall is provided with two steps, and the two steps are embedded into a rock face, thus, a good water interception effect is achieved. The construction method disclosed by the invention is capable of rapidly, accurately and conveniently processing the cross section-variable underground continuous wall disclosed by the invention. The cross section-variable underground continuous wall disclosed by the invention can be widely applied to the construction operation of the underground continuous wall.

Description

technical field [0001] The invention relates to an underground continuous wall in the field of engineering construction and its construction method. Background technique [0002] With the increase of subway lines, there are more and more foundation pit projects in karst areas. By setting the underground diaphragm wall as a reliable support method, the number of joints on the facade can be reduced, and the joints have joints that have been practiced for a long time to ensure the water-stop effect and high quality assurance. The water interception effect is much better than that of the retaining pile scheme. Then, this can cope with some projects with complex geological conditions. However, the geology of some construction sites is layered up and down. For example, the bedrock is carbonaceous limestone. At the same time, the karst caves in the area are strongly developed, and the surface of the slightly weathered rock is directly covered with sand layers. Because the limesto...

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Problems solved by technology

However, the geology of some construction sites is layered up and down. For example, the bedrock is carbonaceous limestone. At the same time, the karst caves in the area are strongly developed, and the surface of the slightly weathered rock is directly covered with sand layers. Because the limestone surface usually has a large and irregular height difference , the bottom of the diaphragm wall is difficult to fit into the embedded rock surface, and the groundwater will flow around the bottom of the wall and enter the foundation pit, causing the risk of base water gushing, so the entire wall is used (according to the requirements of the diaphragm wall construction process, usually the length of each wall is 4-6m) If the bottom of the flat wall is completely embedded in limestone, there will be problems such as large amount of rock entering, difficulty in trough formation, and high risk of breaking through the karst cave during the trough formation process, which will inevitably lead to high construction costs, slow construction progress, and difficult to control construction risks

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