Vertical spliced type underground diaphragm wall and construction method thereof

Abstract

The invention discloses a vertical spliced type underground diaphragm wall and a construction method thereof. The vertical spliced type underground diaphragm wall comprises diaphragm wall bodies 1. Each diaphragm wall body 1 is formed by splicing at least three diaphragm wall units in the vertical direction, wherein the diaphragm wall units are the upper layer diaphragm wall unit 11, the middle layer diaphragm wall unit 12 and the lower layer diaphragm wall unit 13 from top to bottom, the two sides of the top and bottom of the upper layer diaphragm wall unit 11 are each provided with six rebars 6, and two rebars are arranged between every two corresponding cavities 2; the top of the middle layer diaphragm wall unit 12 is provided with holes 7 matched with the rebars 6 at the top of the upper layer diaphragm wall unit 11, and the bottom of the middle layer diaphragm wall unit 12 is provided with a plurality of rebars 6; and the top of the lower layer diaphragm wall unit 13 is provided with holes matched with the rebars 6 at the bottom of the middle layer diaphragm wall unit 12. The two ends of each diaphragm wall unit are provided with a concave connector 3 and a convex connector 4correspondingly. According to the vertical spliced type underground diaphragm wall and the construction method thereof, continuous overall construction of the post-poured wall is achieved, and the overall mechanical compression resistance, tensile resistance and leak resistance are promoted substantially.

Description

technical field [0001] The invention belongs to the technical field of underground engineering, and in particular relates to a vertically spliced ​​underground continuous wall and a construction method thereof. Background technique [0002] Since the 21st century, with the rapid development of social economy, my country's subway has ushered in an unprecedented construction climax. By the end of 2016, the number of cities under construction in mainland China has increased to 53, with a total length of 4400km. As a common form of retaining wall for the main foundation pit enclosure of urban subways, the underground diaphragm wall has been widely used because of its reliable strength, high rigidity, and good integrity. [0003] At present, the underground diaphragm wall mainly adopts cast-in-place underground diaphragm wall and prefabricated underground diaphragm wall. Pour concrete. However, due to the technical characteristics of this underground diaphragm wall, the constru...

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Problems solved by technology

[0005] Chinese patent document 201610420302.3 discloses a "prefabricated assembled underground diaphragm wall structure". The underground diaphragm wall is spliced ​​by the cavity prefabricated components in the groove section through horizontal joints and vertical joints. When assembling, the horizontal joints are coated with waterproof glue, but There are still the following problems: (1) The large number of prefabricated bodies will lead to a large number of assemblies, but only one joint is set at its horizontal interface, which has an impact on the integrity of the continuous wall, and it may occur that adjacent wall sections cannot be aligned. and water leakage; (2) In the process of anchoring the joint bolts of vertical splicing, due to the lateral earth pressure, the construction is quite difficult; (3) The waterproof measures of the diaphragm wall are all coated with waterproof glue, facing the underground For the special structure of the continuous wall, the waterproof performance cannot be guaranteed; (4) The cavity structure in the middle of the prefabricated body is poured concrete directly, without considering the hanging of the reinforcement cage. Although the amount of reinforcement is reduced, this will weaken the strength of the reinforced concrete. The force condition will lead to cracking, which is not conducive to the function of the underground diaphragm wall; the above problems will easily cause the dislocation of the wall connection, resulting in the overall stiffness and deformation resistance of the diaphragm wall, and the decrease of lateral earth pressure. changes, affecting the waterproof performance of the diaphragm wall

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