A top-down construction method for deep foundation pit cover excavation in water-rich soft soil area
A technology of cover-excavation reverse work and construction method, which is applied in excavation, water conservancy engineering, infrastructure engineering, etc., which can solve problems such as hidden safety hazards and low construction efficiency, and achieve the effects of preventing falling off, improving the bearing capacity of the foundation, and reducing deformation
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Embodiment 1
[0066] In water-rich and soft soil areas, the deep foundation pit cover excavation and reverse construction method, the deep foundation pit is set as a four-story structure, of which the first and second floors of the basement are constructed with open cut, and the third and fourth floors are covered and excavated. The first concrete support is set on the ground, the second support and the third support are arranged in sequence between the ground and the first floor, and the fourth support and the fifth support are arranged in sequence between the first floor and the second floor. Supporting, cover-excavation and top-down construction includes the following multiple steps:
[0067] a. If figure 1 As shown, when the foundation pit is excavated to the position of the negative second floor, the soil mold is used to pour 15 concrete on the negative second floor floor, and the side wall construction joints are reserved;
[0068] b. If figure 2 As shown, after the negative second...
Embodiment 2
[0104] This embodiment is applied in the process of steel support erection and dismantling.
[0105] Steel support erection and foundation pit earthwork excavation are two key processes that are inseparable in the construction of deep foundation pits. Steel support erection is very time-sensitive, and the time, position and prestress of steel support erection are directly related to the stability of deep foundation pits. . The erection of steel supports can be carried out with excavation, and axial prestress is applied, so that the enclosure structure can receive the supporting reaction force in advance, and the deformation of the enclosure structure can be reduced. The erection of the steel support should ensure that the steel support is perpendicular to the wall. After the top is tightened, the measure of steel wedge support is used to fix it firmly to prevent the steel support from falling off due to wall deformation and construction collision. When erecting steel support...
Embodiment 3
[0112] This embodiment is applied to side wall construction, and when carrying out side wall construction, comprises the following steps:
[0113] h1. Carry out waterproof construction on the two construction joints on the opposite plate and under the plate respectively;
[0114] h2. Clean the full-section grouting pipe, place the nozzle of the grouting pipe outside the formwork, and bind and fix it with tie wire;
[0115] h3, supporting side wall formwork;
[0116] h4. Use steel truss formwork trolley for concrete pouring;
[0117] h5. Vibrate, and use secondary vibration between the old and new concrete connection surface and the lower ash port.
[0118] The specific operation is:
[0119] (1) Waterproof construction
[0120] According to the characteristics of cover-excavation construction technology, the ground connection wall is a laminated wall, and there are two construction joints at the top and bottom of the joint between the side wall of each layer and the bottom...
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