Supervision of Dhaka Environmentally Sustainable Water Supply Project; Package-2 (DESWSP-P2)



https://drive.google.com/file/d/1z09ovNFkYNM6h0FTQ0T3mjttHJz-xDpN/view?usp=sharing

Comments

Post a Comment

Popular posts from this blog

Butterfly Valve Installation and Chamber Construction

Image
How to install a Butterfly Valve and construct Chamber? Here I share some pictures describing procedures of Butterfly Valve installation and Chamber construction for 1200 mm diameter DI pipe. 1. 100mm thick cc casting with C20 concrete. Then make a layout for re-bar binding. 2. Then start re-bar binding according to drawing. In this case 16mm dia Grade 60 re-bars are used. Must maintain the c/c distance and clear cover. During bending the re-bar development length must have to maintain as per drawing. 3. When re-bar binding finish then the workmanship must be checked by the consultant. 4. After checked by the consultant start form setting. Use required size of block to maintain clear cover. Provide necessary support to prevent form failure during casting. In this case 75mm block are used.                                   5. Before casting check...
Read more

Air Valve Chamber Construction

Image
Construction Method of Air Valve Chamber for Ductile Iron Pipeline Air valves play a critical role in water transmission systems. They are typically installed at high points along the pipeline to release trapped air, thereby ensuring smooth and efficient flow. This section outlines the step-by-step construction procedure of an air valve chamber for a Ductile Iron (DI) pipeline, supported by site practices and illustrative references. 1. Installation of All-Socket Tee The first step involves the installation of an all-socket tee within the DI pipeline. A cut section of pipe is connected to the branch of the tee to facilitate the future installation of the air valve assembly. For proper execution of subsequent civil works, a minimum clearance of 3 meters should be maintained on both sides from the centerline of the tee. This space is essential for shuttering, reinforcement placement, and other formwork activities. After installation, the pipe invert level and alignment must be caref...
Read more

COLLAR JOINT

Image
What is Collar Joint in DI Pipeline construction? Collar joint is a type of joint which is generally used in case of DI Pipeline construction. The components of collar joint are; 1. Collar, 2. T-head bolts, 3. Gland 4. Rubber Gasket. Generally when there are different contractors work on a large pipeline construction or during bridge, culvert crossing it is not possible to carry on the work at same time which results in different segment of a same pipeline. To joint those segments we need to use collar. For this joint, it is necessary to maintain same elevation and alignment on both sides of the joint otherwise joint can not be done. To do this we need to expose both side when there is about at least 30m gap. During collar joint there are some checks we must have to perform which are gasket check, joint gap checking which is should be less than 5mm.
Read more