1. Overview
Rubber dam is a type of low head water retaining structure that emerged in the late 1950s with the development of polymer industry as a new type of hydraulic structure. It is a new type of water retaining structure that uses synthetic high-strength fiber canvas as the load-bearing skeleton, and its surface waterproof layer and protective layer are made of adhesive tape attached with chloroprene rubber (or other synthetic rubber) or made of integral vulcanized adhesive tape, anchored to the dam bottom plate according to the design size, forming a closed shape. After more than 30 years of practice, China's rubber dam industry has formed its own characteristics in engineering planning, design, dam bag manufacturing, installation, and operation management, and has reached the world's advanced level.
With the increasing pace of rubber dam construction, its promoting effect on economic and social benefits is becoming increasingly significant, and it is widely used in many fields such as flood control, water retention irrigation, urban and rural water supply, hydropower generation, and environmental beautification. The water resources in the reservoir area are also undergoing dynamic changes such as overflow, infiltration, and evaporation.

2. The necessity of suture and adhesive repair technology
The top of the rubber dam can overflow, and the dam height can be adjusted as needed to effectively control the upstream water level and discharge flow, enabling optimal allocation and utilization of surface water resources. In the daily operation and management of rubber dam projects, every year due to natural or human factors, there may be situations such as ultra-high, overpressure operation, excessive overflow water depth, or uneven overflow water depth, resulting in vibration of the dam bag and the rubber dam bag structure not meeting the requirements of project operation; External impact and local wear of rubber dam bags; The failure of the charging and discharging system, human damage, freezing damage, and the collapse of the rubber dam bottom plate causing tearing and damage of the dam bag. Due to the large weight of rubber dam bags, once damaged, especially with longitudinal large incisions and extensive tearing, it not only results in a single repair plan, long construction period, and high cost, but also seriously affects the normal performance of engineering benefits.

According to the design principle of rubber dam bags and the technical process requirements for repairing and repairing dam bags specified in the "Technical Specification for Rubber Dams" (SL227-98), through the technical practice and research of longitudinal large incision stitching and repairing of dam bags, it is also applicable to other cracks. This technology targets the longitudinal cracks in rubber dam bags. During the repair process, based on the characteristics that the rubber dam bag is mainly subjected to radial stress on the bag fabric and very little stress on the latitudinal stress on the bag fabric, a new technology of longitudinal crack stitching and adhesive repair is innovatively applied using nylon thread with the same radial fiber degree as the original bag. It is an extension of the original dam bag maintenance and patching technology, improving productivity and increasing production efficiency, which has made breakthrough progress in the maintenance and patching technology of dam bags. Its innovation lies in stitching.