Construction method for strengthening and water-retaining for I-shaped steel joint of underground diaphragm wall

Abstract

The invention discloses a construction method for strengthening and water-retaining for an I-shaped steel joint of an underground diaphragm wall. The construction method comprises the following steps: firstly, welding a steel reinforcement cage in a first-stage construction groove section of the underground diaphragm wall with the I-shaped steel joint, pre-embedding two grouting steel pipes in a near-soil side of a flange plate of the I-shaped steel joint, and locating the two grouting steel pipes at the two ends of the flange plate of the I-shaped steel joint separately; secondly, arranging the first-stage steel reinforcement cage in the first-stage construction groove section, and carrying out pouring working in the first-stage construction groove section; thirdly, arranging a second-stage steel reinforcement cage in a second-stage construction groove section, and carrying out pouring working in the second-stage construction groove section; and finally, after pouring working in the first-stage construction groove section and pouring working in the second-stage construction groove section are completed, connecting the grouting steel pipes with a grouting machine and carrying out grouting, and after the grouting working is completed, forming a semicircular strengthening area taking the I-shaped steel joint as the circle center and having a radius of 1.0-1.8m on the near-soil side of the I-shaped steel joint. The construction method disclosed by the invention is capable of improving the waterproofness of the I-shaped steel joint during construction for the underground diaphragm wall, so as to achieve a purpose of effectively controlling water leakage at the I-shaped steel joint.

Description

technical field [0001] The invention belongs to the technical field of underground diaphragm wall construction, and in particular relates to a construction method for reinforcing and sealing water at I-shaped steel joints of an underground diaphragm wall. Background technique [0002] With the continuous expansion of the scale of underground engineering construction in my country, especially the foundation pit enclosure project has reached an unprecedented scale. In the field of foundation pit enclosure structure construction, the underground diaphragm wall has the characteristics of small vibration, low It has the characteristics of high body rigidity, large construction depth, load bearing, good anti-seepage performance, and no disturbance to the surrounding foundation. It can be close to the original building and adapt to the construction of various complex strata. Therefore, it is designed and constructed in my country's underground projects. used widely. The underground ...

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Problems solved by technology

[0004] At present, for the water leakage at the I-steel joints of the diaphragm wall, stirring piles and rotary grouting piles are usually used to block the water to strengthen the soil, and there are also grouting reinforcements to stop the water, so as to control the leakage of the I-steel joints. Although the stirri

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