A construction method of a new type of joint between a gravity dam and a face dam

Abstract

The invention discloses a construction method of a novel joint type of a gravity dam and a face dam. It adopts the new joint type of gravity dam and face dam for construction. The specific construction method includes the following steps. Step 1: Construction of the connection section between the side wall and the thorn wall; the construction of the connection section of the side wall and the thorn wall includes foundation treatment, side wall formwork and Pouring, piercing wall formwork and pouring; step 2: pave special cushion under the side wall and panel, and lay special cushion along the joint; step 3: composite flexible water-stop construction; at the joint of side wall and panel The seam is filled with plastic filler. After the filler bulge is formed, it is first covered with a traditional flexible waterproof anti-seepage cover, and then covered with a polyurea composite tire base cloth coated cover. Both sides are edged with stainless steel strips and anchored with stainless steel expansion bolts. The invention solves the problems of large concrete engineering quantity, long pouring time, complicated concrete temperature control measures and the like of the traditional side wall joint; it has the advantages of small concrete engineering quantity and good anti-seepage effect.

Description

technical field [0001] The invention relates to the field of joint treatment of mixed dams in water conservancy and hydropower engineering, more particularly, it relates to a construction method of a new joint type between a gravity dam and a face-face dam, which is suitable for the construction of the connection section between the gravity dam and the face-face dam. Background technique [0002] Gravity dams have high requirements on the foundation. When the dam axis is long and the bearing capacity of the dam foundation is insufficient, the foundation treatment cost required for the arrangement of gravity dams along the entire line is high, and the project investment increases. Concrete dams, on the other hand, have low requirements on the foundation, and can make full use of local materials. When the bearing capacity of the dam foundation is insufficient, it is suitable for the construction of concrete dams. Therefore, in water conservancy and hydropower projects, the adv...

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Problems solved by technology

[0011] The purpose of the present invention is to provide a construction method of a new type of joint between a gravity dam and a face dam, which has a small amount of concrete work and good anti-seepage effect, and is used for the construction of the joint section of the mixed dam; it solves the problem of concrete engineering of the traditional side wall joint Large amount, long pouring time, complicated concrete temperature control measures, etc.; the invention fills special cushions at the joints, which solves the problems of relative settlement and tension cracks at the joints of the mixed dam, and the joints are easy to disengage under the action of earthquakes. The problem of poor seepage durability; the present invention uses a composite flexible water-stop structure to improve the anti-seepage performance of joints

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