What Is a Catheter Plug?

The duct method is an underwater concrete pouring method that passes the concrete mixture through the lower mouth of the duct and enters the bottom of the initially poured concrete (as a water barrier). The newly poured concrete supports the initially poured concrete and rises to the surrounding area. .

Insert the catheter, the outlet of the catheter is 0.3-0.5M from the bottom of the hole.

The upper mouth of the pipe uses a funnel to receive the concrete.

The top of the funnel is connected to the concrete by a bin, and there is a valve under the bin. The volume of the first tank is generally 1.5 cubic meters. And add a colored concrete plug with a cement bag to the spoken language of the catheter. The purpose of the above measures is to ensure that the outlet of the conduit is buried more than 0.5M below the concrete.

The concrete is continuously lowered from the duct, and the depth of the concrete surface is measured every half an hour, and the total length of the duct is calculated. It is concluded that the outlet of the conduit is buried 3-5M under the concrete. Shallow pipe openings can easily break away from concrete and cause broken piles. Buried too deep, pressure is too high, fresh concrete can not go down, old concrete is too easy to set early, the result will also cause broken piles.

The pouring project is very intense, and every link must be in place. Quality inspectors were in place, and supervisors and team leaders were present. The reason for the broken pile was that the equipment was broken and there was no spare. If the mixer has no backup, the power supply does not have a backup generator. If broken piles occur, the treatment method should be agreed by the design department. Generally, it should be excavated, drilled and cropped. Waste is huge.

1) The supply capacity of the concrete mixture when pouring underwater concrete shall meet the completion of the pouring of the pile holes within the prescribed time, and the pouring time of the concrete shall not be longer than the initial setting time of the first batch of concrete.

2) Concrete pump or concrete mixer truck should be used for concrete transportation. When the transportation distance is less than 200m, it can be transported by a mobile dump truck or other tight, non-leakage, non-absorbent, and convenient loading and unloading tools. It is necessary to ensure that the concrete does not segregate and has good workability and fluidity.

3) Cast-in-water concrete is generally constructed by the steel pipe back-to-top method. The inner diameter of the pipe is 200-250mm, depending on the diameter of the pile, and the wall thickness is not less than 3mm; the diameter production deviation should not exceed 2mm; Buckle or flange connection, a gasket or rubber pad must be added during connection, and the wire buckle or bolt must be tightened. Before using the catheter, a watertight pressure-bearing and joint tensile test (water test pressure is generally 0.6 to 1.0 MPa) should be performed to ensure the tightness of the catheter mouth. When connecting, it is necessary to add a gasket or rubber pad, and tighten the screws or bolts. Before using the catheter, a watertight pressure-bearing and joint tensile test (water test pressure is generally 0.6 to 1.0 MPa) should be performed to ensure the tightness of the catheter mouth. In the upper part, 2 to 3 short sections of 0.5 to 1.0 can be placed to adjust the total length of the catheter. When placing the catheter, ensure that the catheter is centered in the hole to prevent collision with the reinforcing steel skeleton. ^[1]

1) Generally refers to the pipe used for grooming.

2) Industrial use

specification

It is generally convenient for construction personnel to construct. The general length of the duct is 2 meters, 2.5 meters, 2.7 meters, 3 meters, and the bottom pipe is generally 4 meters.

It is equipped with an adjustment section of 0.5 meters, 1 meter, 1.5 meters,

model

(Diameter) 219mm, 250mm, 258mm, 260mm, 270mm, 288mm, 300mm, 325mm, 377mm, 425mm, etc. Among them, the most widely used are 260mm, 300mm, etc.

structure

Each section of the catheter is composed of a circular light pipe and a catheter joint.

The structure of the catheter has several points:

1) Each section must be interchangeable

2) It must be vertical after docking,

3) Irrigation and pressure should not leak after docking,

4) Must have tensile strength and torque.

Industrial ducts play a great role in the construction of foundation buildings and are an indispensable tool ^[1] .