Ethylene-propylene-diene monomer rubber and method for casting electric power trench at one time by adopting same

Abstract

The invention discloses ethylene-propylene-diene monomer rubber and a construction method for casting an electric power trench at one time by using the ethylene-propylene-diene monomer rubber and a telescopic formwork bracket, wherein an ethylene-propylene-diene monomer rubber water stop belt is prepared from 100 parts of ethylene-propylene-diene monomer rubber, 32-35 parts of carbon black, 20-25 parts of paraffin, 2-4 parts of sulfur, 15-30 parts of light calcium carbonate, 0.5-1.2 parts of an accelerant and 1-2 parts of stearic acid. The construction method comprises the following steps of: (1) binding reinforcing steel bars; 2) carrying out formwork construction; (3) carrying out deformation seam construction; (4) casting and vibrating concrete; and (5) backfilling the foundation pit, wherein reinforcing steel bars are bound at a time, a formwork is machined and installed at a time, the interior of the formwork is supported by a formwork bracket, the bracket is a telescopic formwork bracket, one-time casting of an electric power trench is achieved, and original two-time reinforcing steel bar binding, two-time formwork erecting and two-time concrete casting are all simplified to one time. According to the invention, a large formwork is adopted, construction seams are not reserved, ethylene-propylene-diene-terpolymer middle-buried type and externally-attached type rubber water stop belts are adopted in deformation seams, the permeability and water seepage prevention capacity of the electric power trench is improved, and the structural integrity is enhanced.

Description

technical field [0001] The invention belongs to the technical field of EPDM waterproof materials and the technical field of construction of cast-in-place power ditches in municipal engineering, and in particular relates to a method for one-time pouring of power ditches by using EPDM rubber and a retractable support. Background technique [0002] The municipal power trench is a cable tunnel constructed by combining steel bars and concrete. The tunnel consists of one or more square, rectangular or circular sections. During the construction, the construction is divided into several construction sections according to the deformation joints, and the main project of each section of the power ditch is divided into three sub-projects: steel bars, formwork, and concrete. [0003] At present, during the construction of the main concrete of the power trench with a rectangular cross-section, it has been a common practice for many years to pour the concrete twice. There is a horizontal c...

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Problems solved by technology

This process leaves a horizontal construction joint, which affects the integrity of the power trench. The joint surface of the construction joint concrete is chiseled and cleaned, and the labor, materials, and mechanical equipment for pouring concrete are prepared for the second time, which increases the workload and prolongs the construction time. duration

[0008] The conventional construction method of the above-mentioned two-time pouring of rectangular power trench concrete can be expressed according to the construction sequence as follows: binding the bottom plate and side wall reinforcement to the overlapping position → installing the bottom plate, side wall formwork below the center line of the water stop, water stop → pouring the bottom plate, Concrete of the side wall below the center line of the waterstop → maintenance and removal of formwork → binding of the top of the side wall and roof reinforcement → installation of side wall and roof formwork → pouring of side wall and roof concrete → maintenance and removal of formwork eight construction processes, the process is cumbersome and complicated

At the same time, in this process, the use and installation of the waterproof tape is improper, and the life is short, which also seriously affects the waterproof performance and safety of the power ditch.

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