Overall hoisted prefabricated underground continuous wall structure and prefabricating and construction method thereof

[0030] The present invention will be further described below in conjunction with specific embodiments and accompanying drawings, so as to help understand the content of the present invention.

[0031] like figure 1 As shown, it is a structural schematic diagram of an integral hoisting prefabricated underground diaphragm wall body provided by the present invention. It includes a prefabricated underground diaphragm wall body 2, the two ends of the prefabricated underground diaphragm wall body 2 are correspondingly provided with mortise joints 4, and the two sides of the wall body at the butt joint of the prefabricated underground diaphragm wall are respectively provided with water stop grooves 7. The water-swellable rubber water-stop strip 1 is provided in the water-stop groove 7 . The water-swellable rubber water-stop strip 1 can swell three times in volume after being exposed to water, and can fully fill the gap of the water-stop joint 5, and has an excellent waterproof effect. The water-swellable rubber water-stop strip 1 is placed in the water-stop groove 7. When the external water seeps into the continuous wall, it must first pass through the water-stop groove 7, and then pass through the water-expandable rubber water-stop strip 1. The structure of the water-stop groove 7 When the first layer of waterproof effect is reached, it forms a double protection with the water-swellable rubber waterstop strip 1. The two lines of defense can effectively prevent the entry of water and sediment, and prevent seepage. The mortise joints 4 are divided into three groups and distributed symmetrically, which greatly improves the strength of the joints and can effectively prevent sliding and misalignment between the continuous walls, making the connection more compact and firm. Preferably, the mortise joint 4 is rectangular. Both sides of the prefabricated underground diaphragm wall are provided with prestressed steel bars 3 . The strength of the prefabricated underground diaphragm wall is effectively increased, and the prefabricated underground diaphragm wall can withstand large lateral earth pressure, and can avoid damage to the prefabricated underground diaphragm wall during transportation. A steel bar 6 is reserved above the prefabricated underground diaphragm wall body 2 (such as image 3 shown). It can eliminate the need to chisel off a large amount of top concrete after the construction of the underground diaphragm wall in the traditional construction process, reduce resource consumption, facilitate subsequent processing, and help improve construction efficiency. Preferably, the length of the steel bars 6 reserved above the prefabricated underground continuous wall body 2 is 1 m.

[0032] The prefabrication method of the overall hoisting prefabricated underground continuous wall structure includes the following steps: firstly, the reinforcement is configured according to the calculation requirements and the reinforcement cage is rolled. Then, the pre-tensioning method is used to prefabricate the wall part of the underground diaphragm wall. According to the design specifications, the reinforcement cage is first placed in the factory, and the prestressed tendons on both sides of the reinforcement cage are locked and stretched with prestressed anchors. After the tensioning is completed, concrete is poured. During the prefabrication process of the continuous wall, the steel bar 6 at the top of the wall needs to be reserved for 1m to protrude out of the concrete. The underground diaphragm wall needs to be cured by steam in the later stage to ensure the quality of the concrete.

[0033]The integral hoisting prefabricated underground diaphragm wall provided by the present invention needs to be prefabricated in the factory, and the production and maintenance conditions are controlled manually, which can better ensure the quality of the concrete. Use a crane to lift and assemble, which greatly shortens the construction period and improves construction efficiency. The side of the wall adopts the pretensioning method to add prestressed steel bars 3, which effectively improves the wall strength of the diaphragm wall, can withstand large lateral earth pressure, and can avoid damage to the prefabricated underground diaphragm wall during transportation. In the prefabrication process, there are steel bars 6 protruding from the top of the diaphragm wall, which eliminates the need to chisel off a large amount of top concrete after the construction of the underground diaphragm wall in the traditional construction process, which can reduce resource consumption and facilitate subsequent processing. Help to improve construction efficiency. The joints of the continuous walls are designed with three groups of mortise joint structures, which are symmetrically distributed, which greatly improves the strength of the joints, and can effectively prevent sliding and misalignment between the continuous walls, making the connection more compact and firm. Water-swelling rubber water-stop strips 1 are provided on both sides of the wall at the butt joint of the prefabricated underground diaphragm wall. The water-swellable rubber water-stop strips 1 expand three times in volume when encountering water, and can The water-swellable rubber water-stop strip 1 is closely combined with the walls of the two adjacent continuous walls, and the two lines of defense can effectively prevent the entry of water and silt and prevent seepage.

[0034] The construction method of the overall hoisting prefabricated underground diaphragm wall structure comprises the following steps: before the excavation of the groove section, a guide wall is constructed along the longitudinal axis of the diaphragm wall, and cast-in-situ concrete or reinforced concrete is used for pouring. The depth of the guide wall is 1.2-1.5m, and its top surface is 10-15cm higher than the ground to prevent surface water from flowing into the guide ditch. The width of the guide wall is 10cm wider than the wall thickness of the prefabricated underground continuous wall. The sinker is used to excavate the groove section. After the groove section is excavated, the single prefabricated underground diaphragm wall is hoisted by a large crane and put into the groove. When the next diaphragm wall is hoisted, the crane strictly controls the continuous The position of the wall, so that the mortise joint 4 and the water stop joint 5 of two adjacent walls can be neatly and closely connected (such as figure 2 shown). After the two continuous walls are stabilized, other continuous walls are placed in sequence according to this method. The mortise joint design of the water stop groove 7 can more effectively prevent the entry of external water. Both sides of the wall at the joint of the continuous wall are provided with a water-stop groove 7, and the water-swellable rubber water-stop strip 1 is arranged in the water-stop groove 7, which plays a double protective role and can effectively prevent the occurrence of seepage. Three groups of symmetrical mortise joints 4 can effectively prevent relative sliding and misalignment between the continuous walls, making the connection more compact and firm.

[0035] In this paper, specific examples are used to illustrate the inventive concept in detail, and the descriptions of the above embodiments are only used to help understand the core idea of ​​the present invention. It should be pointed out that for those skilled in the art, any obvious modification, equivalent replacement or other improvement should be included in the protection scope of the present invention without departing from the inventive concept.