Water-proof construction method for connected nodes of foundation slab and ground wall in composite surround system

Abstract

The invention discloses a water-proof construction method for connected nodes of a foundation slab and a ground wall in a composite surround system, and relates to the technical field of underground engineering water-proof construction. The water-proof construction method aims at the problems that the interface of a new concrete structure and an old concrete structure and the chiseled portion of a bored cast-in-place pile are prone to forming underground water seepage path, and the construction quality of the foundation slab is influenced. The water-proof construction method comprises that 1, a sunken portion is dug on the edge of a foundation pit, a concrete base layer is constructed, a first geosynthetic clay liner is laid to the bored cast-in-place pile, and closing up is carried out; 2, the foundation slab to be poured and a reinforcing steel bar bracket to be turned downwards are erected and bond, and a space on the edge of the foundation slab to be poured is reserved; the foundation slab is poured, and the bracket is turned downwards; 3, the portions, over the bottom elevation of the foundation slab, of the bored cast-in-place pile and a high-pressure jet grouting pile are chiseled away, and a depth D is dug downwards along the bottom elevation of the foundation slab continuously; a base layer is poured on the chiseled portion and coated by a second geosynthetic clay liner, and closing up is carried out; and 4, after a pouring belt is poured, the pouring belt and the foundation slab are fixedly connected into a whole.

Description

technical field [0001] The invention relates to the technical field of waterproof construction of underground engineering, in particular to a waterproof construction method for connecting nodes between a foundation floor and an underground diaphragm wall in a composite enclosure system of an underground diaphragm wall and bored piles. Background technique [0002] In the construction of underground engineering, under normal circumstances, the base plate can be continuously poured to the edge of the underground diaphragm wall. After the concrete of the base plate reaches the strength required by the design, the ring beam and reinforced concrete support above it can be removed to meet the requirements of "support first and then dismantle". ” basic principle, so as to complete the support replacement operation; as for the waterproof treatment process of the connection between the base plate and the diaphragm wall, it is only necessary to extend the waterproof material on the bas...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that in the composite enclosure system, the groundwater seepage path is easily formed at the interface between the new and old concrete structures and the excavated parts of the bored piles, which seriously affects the construction quality of the foundation floor. The purpose of the present invention is to provide a composite The waterproof construction method of the connection node between the foundation floor and the ground wall in the enclosure system, by adding multiple waterproof materials to the two waterproof weak areas of the downturned corbel and the foundation floor post-pouring belt, thus effectively separating the foundation floor from the foundation soil and the foundation floor The post-pouring belt and the first pouring foundation floor, as well as the groundwater seepage path between the foundation floor post-casting belt and the underground diaphragm wall, strengthen the waterproof capacity of the joint between the foundation floor and the underground connection wall, thereby improving the construction quality of the foundation floor

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