JPS5872796A - Device for closing opening end of piping - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION fil TECHNICAL FIELD The present invention relates to a device for closing an open end of a pipe through which a fluid flows.

(2) Prior Art Conventionally, when closing the open end of a pipe, a blind plate was welded to the pipe.

Blind boards can be either permanently installed or used temporarily, for example during construction work. We will discuss the problems with blind plates when they are used temporarily, such as when used for dielectric pressure tests.

FIG. 1 shows a cross-sectional view of the blind plate 2 welded to the guide gl. In the pipe pressure test, 1112 pins of blind plate 2 were attached to the wiring a1 as shown in Fig. 1, and air was injected into the wiring #)/3ziB to a predetermined pressure, and the pipe itself was tested against the pressure inside the pipe. Inspections and tests are carried out to determine whether the integrity of pipes meets specified standards and whether there are any leaks in the piping.

The pipe 1 whose soundness has been proven in this way is shown by the broken line a in FIG.
It is cut at the position shown in Figure 2, and the bevel 71+]
(for example, the shape shown in lb), a beveling process is also performed, and the connecting pipe 3 is contacted and welded.

13) Disadvantages of the prior art As described above, before carrying out the pressure test, a blind plate must be welded to the arrangement a1, and after the test, the piping 1 and the flan ' as shown in FIG. ) Since it is necessary to perform beveling after cutting 2 and 2, it takes time to prepare the number of steps before and after the pressure test. There is a drawback.

(4) Purpose of the Invention The present invention has been made in view of the above circumstances, and its purpose is to provide a system for closing the open end of piping that enables reduction of work man-hours, improvement of work efficiency, and shortening of processes. Nichiru.

(5) Key points of the invention A support frame body having a gripper connected to one end for extracting the surface of the blocked pipe and a through-hole provided at the other end, and disposed through the through-hole of the support frame body. an operating rod that is movable and fixable in the axial direction of the pipe to be blocked, and a flat plate made of a soft material that is provided at an end of the operating rod in the support frame and is pressed into contact with the pipe to be blocked. The gripper is equipped with a blind plate in which a plurality of wires coated with a soft material are alternately in free contact and knitted into a mesh body, and the mesh body is formed into a cylindrical shape at the open end of the pipe. An object of the present invention is to provide a closure device.

;6) Structure of the invention FIG.
FIG. 3 is a partially sectional side view showing the state in which the device is attached to the device.

The present invention comprises a gripper 6 that grips and friction-bonds the outer wall V of a pipe 5 whose opening is to be closed at one end, and a main body of an open end closing device that is connected to the gripper 6 and holds the end of the pipe 5. a supporting frame 7, a flat plate 8 made of soft material provided at the end opening of the pipe 5, a blind plate 9 supporting the flat plate 8 made of soft material, and this blind plate 9 and the flat plate 8 made of soft material. An operating rod 1 provided between the support frame 7 and the blind plate 9 for pressing
It consists of 0.

As shown in FIG. 4, the gripper 10 is wrapped around the pipe 5 in a cotton-like manner (only the intersection points are in contact).

The gripper 10 is expandable and retractable as a whole, and the gripper 10 is extended until the inner surface of the gripper 10 comes into close contact with the piping surface.
By applying a tensile force to the gripper 10 and stretching it, a strong frictional force is generated between the inner surface of the gripper 10 and the surface of the pipe. The material of the gripper 6 is gold striped.
In order to strengthen the frictional force with 5, it is necessary to make it, for example, of a soft material (for example, soft plastic, vinyl, etc.) with a large coefficient of friction. In order to further increase the strength, it is most preferable to coat the wire with these soft materials f. According to experiments, gripper 10 with a length of about 30 CIn for a pipe having the same size and shape as shown in the drawing in Figure 4 has a gripping force of about 200 to 300.
It has been confirmed that it can withstand the tension of Yu. If gripper 10 is made of bare wire, metal piping 5
Since the coefficient of friction is small, it will slip and become useless. In such cases, the necessary coefficient of friction can be obtained by coating the pipe with a soft material. In order to obtain an even larger coefficient of friction, a soft material is applied to the piping, and a wire gripper 1l coated with the soft material is used.

The support frame 7 has an opening with the same diameter as the pipe 5 in the example shown in FIG. It is better to have a shape.

The flat plate 8 is made of a soft material (for example, rubber) in order not to damage the grooved part of the g5 and to be usable even when the diameter of the pipe changes slightly. Possibly installed.

In the blind plate 9, the threaded portion 10a provided on the operating rod 10 and the threaded portion 7a provided on the end of the U-shaped member 7 are engaged with each other by rotation of the handle 1o1 of the operating rod IQ, and the recess 9a of the blind plate 9 is formed. The convex portion 10b of the pressing component 1o freely rotates and is pressed against the distribution W5. In addition, the code|symbol 12 is a presser plate.

(7) Effects of the present invention Next, an example of use of the piping open end closing device of the present invention will be described.

First, cover the pipe 5 with the contracted gripper 6, make sure that the flat plate 8 is in close contact with the groove 5a of the pipe 5, extend the gripper 6 toward the pipe, and then attach the U-shaped member 7. The tension gripper 6 is brought into close contact with the pipe in the opposite direction of the pipe 5.

Next, by rotating the handle IOh directly connected to the threaded part 1.)a, the blind plate 8 is pressed against the end of the pipe 5,
Further rotate the handle 10h.

If this single element is used, the support frame 7 will receive a stronger tensile force, and the gripper 6 fixed to the support frame 7 will also receive an additional tensile force, making the gripper 6 stronger on the piping surface. You can get close to it. The flat plate 8 is strongly pressed against the end of the arrangement A5 as a reaction force of the tensile force of the U-shaped member 7, and can be sealed. In this way, the piping opening/closing device of the present invention is installed.
Fixed to #.

In addition, it became necessary to remove the piping opening end blocking device1.
If the handle 1011 is loosened or the gripper 6 is pushed back toward the support frame 7, the gripper r3
Since the diameter of the gripper 6 is enlarged and a gap is created between the gripper 6 and the pipe 5, it can be removed very easily.

(8) As described in detail of the invention, the piping open end closing device according to the present invention can pass a pressure test without welding while the piping is in a grooved state, so that the blind plate completely fails. The number of man-hours required for attachment work can be saved. Also, after completing the test, immediately proceed to the welding work with the connecting piping.

Furthermore, compared to the conventional method in which one plate is attached, the device according to Akira Motoike is easier to install, and after the test, the work of cutting the end of the pipe to which the d plate is attached can be omitted.

Therefore, according to the present invention, the work efficiency of the entire pressure test including the conventional pressure test by mounting a blind plate, its steps, and the welding work with the joint arrangement U after the test is greatly improved, and the number of man-hours is reduced. Furthermore, it is easy to understand that the testing process can be greatly shortened, and the piping installation process can be greatly shortened and materials can be saved significantly.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the installation of a conventional blind plate, Fig. 2 is a diagram of a conventional piping connection, Fig. 3 is a cross-sectional view showing an embodiment of the present invention, and Fig. 4 is a configuration of the present invention. Gripper as a component
FIG.

Claims (2)

[Claims] (1) A support frame body having one end connected to a gripper that covers the surface of the piping to be blocked and a through hole provided at the other end; an operating rod that can be moved and fixed in the axial direction of the closed pipe;
A blind plate is provided at the end of the support frame of the operating rod and includes a flat plate made of a soft material that is brought into pressure contact with the side of the pipe to be blocked, and the gripper has a plurality of grippers covered with a soft material. A device for closing the open end of piping, characterized in that the wires are alternately woven into a mesh body in free contact and the mesh body is formed into a cylindrical shape. (2) The apparatus for closing an open end of a pipe according to claim 1, wherein the gripper is made of a soft synthetic resin. (31 The blind plate and the operating rod are rotatably provided on the axis of the pipe to be blocked, and the operating rod and the support frame are formed by a convex screw provided on the operating rod side and a recess provided on the support frame side. 3. The apparatus for closing an open end of a pipe according to claim 1 or 2, wherein the device is movable in the axial direction of the pipe to be closed by engaging and rotating a screw.