JPS5817897B2 - Kokansui Atsushikenkino Suimitsuhojibuyoupatsuking - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a backing used in a watertight retaining section of a steel pipe hydraulic testing machine.

Generally, a water pressure test is performed after thread cutting, mainly during the process of steel pipes such as casing pipes until they are put into storage.

In conventional water pressure testing of steel pipes, a coupling is fitted to one end of the threaded steel pipe and inserted into the test stock head, and the other threaded end is inserted into the tail stock head. Water pressure is applied to the outer periphery of the ring-shaped backing placed around the base of the rib to compress it, and water pressure is applied to the inner surface of the steel pot while the inner periphery of the backing is held in close contact with the outer periphery of the steel pipe. We are conducting a test.

By the way, a protector or cap is inserted into the threaded part that is inserted into the tail stock head to protect it, but in conventional tests, this protector or cap is removed during the test, so it is not efficient. Work efficiency was also affected by personnel allocation.

Therefore, there was a desire to be able to perform tests with the protector attached, but because the clearance between the backing and the steel pipe becomes large, the conventional backing cannot withstand use.

In particular, the test main river also acts on the inside of the backing, and as a result, the part that comes into contact with the outer periphery of the steel pipe bends outward, causing aqua regia leakage and damage, which can be significant if the clearance is large. .

Furthermore, if the backing is damaged, it takes a considerable amount of time to repair it, resulting in a significant drop in testing efficiency.

This invention makes it possible to conduct a water pressure test with the protector attached, in order to address the problem with the conventional method.
We propose a backing that enables complete high-pressure sealing.

The embodiments of this invention shown in the drawings will be described below.
The backing body 1 is made of polyurethane rubber or other raw rubber with a large amount of expansion and contraction, and has an inner diameter considerably larger than the outer diameter of the steel pipe to be tested.

It is formed into a ring shape so that a coupling or protector can be easily inserted.

Flanges 2 are formed at both ends of the outer periphery.

A square cutout 1A is provided around the inner corner of the side surface of the backing body 1 on the side where the steel pipe end is inserted, and backup pieces 3 are arranged radially within the cutout 1A.

Adjacent backup pieces 3, 3 are overlapped at their circumferential end portions in a phase-notched manner, and the intervals therebetween are set to be equal intervals during normal times.

Each back-up piece 3 has a screw 4 in its center.
It is attached to the backing main body 1 by etc.

That is, the screw 4 protrudes from the center of the back surface of the back up piece 3 and is screwed into the backing body 1.

Further, a circular arc-shaped adapter piece 5 made of aluminum alloy or the like is provided on the backing body 1 at the portion where the back-up pieces 3 are adjacent to each other, and the rear surface of the end of the adjacent back-up piece 3 can slide on this. is in contact with

The adapter piece 5 is provided with a right-angled rib 5/ on the outer circumferential side of the backing body 1, forming a straight line shape, and the outer circumferential surface of the end of the adjacent back-up piece 3 is slidably in contact with the rib 5/. There is.

In addition, the inner peripheral part of the backing body 1 has a back up piece 3.
The inner diameter is tapered from one side to which the adapter piece 5 is attached to the other side.

The backing main body 1 configured as described above is installed in the tail stock head main body 6 of a hydraulic testing machine.

As shown in FIG. 1, the hydraulic testing machine is equipped with a tail stock head body 6 and a test stock head body 7 opposite thereto, into which the ends of steel pipes 8 are inserted.

The tail stock head main body 6 is provided with an insertion hole 9 for a steel pipe 8, into which the end of the steel pipe 8 with the protector 10 fitted is inserted through the backing 11 at the tip thereof. The backing body 1 is attached to the inner circumference of the insertion hole 9.

The water guide hole 12 of the tailstock head body 6 communicates with the outer circumference of the backing body 1 .

The test stock head body 7 is also provided with an insertion hole 13 for the steel pipe 8, into which the end of the steel pipe 8 with the coupling 14 attached is inserted through the backing 15 at the tip thereof. Insertion hole 13
A backing 16 is attached to the inner periphery.

The water guide hole 17 of the test stock head body 7 communicates with the outer periphery of the backing 16 .

During the test, high pressure water is supplied from the introduction hole 12 to compress the backing body 1.

As a result, the backing main body 1 contracts, and at the same time, the back up pieces 3 reduce the gap between them, and finally slide on the surface of the adapter piece 5 so that the half-shaped parts join, so that the backing main body 1 is reduced and its inner peripheral surface is carefully sealed to the outer peripheral surface of the steel pipe 8.

Here, the adapter piece 5 prevents the backing body 1 from flowing and expanding between the backup pieces 3, and ensures smooth sliding of the back-up piece 3.

In this state, even if water pressure is applied to the inner surface of the steel pipe and water pressure is applied to the inner surface of the backing body 1, the inner circumference is supported by each back-up piece 3, so the crimp is securely maintained without bending outward. be done.

Moreover, if the high-use water is released after the test, the original state is restored and the steel pipe 8 can be removed.

Furthermore, since the back-up piece 3 is fitted into the backing body 1 only by screws 4, the back-up piece 3
It is extremely easy to attach and detach.

This invention has the above-mentioned configuration, and since a large number of arcuate backup pieces are attached radially to the side surface of the ring-shaped backing main body at intervals, the backing main body can be reduced together with the backup pieces, and the backup pieces can be reduced in size together with the backup pieces. It is supported by the steel pipe and is securely crimped and held on the outer periphery of the steel pipe.

Therefore, even if there is a large clearance between the inner periphery of the backing body and the outer periphery of the steel pipe, it is possible to completely seal the gap and prevent water leakage.

Since the ring-shaped backing body adjacent to the back-up pieces is provided with an adapter piece, this supports the part between the back-up pieces, preventing damage to this part, and making it possible to smoothly move the back-up pieces. It can be slid on.

Therefore, according to the present invention, a water pressure test can be performed with the protector attached to the tube end, thereby improving workability and saving labor.

[BRIEF DESCRIPTION OF THE DRAWINGS] The drawings show an embodiment of the present invention. Figure 1 is a schematic sectional view of a water pressure test, Figure 2 is a partial front view of the backing,
FIG. 3 is a sectional view taken along the line AA in FIG. 2.

Claims (1)

[Claims] 1. A ring-shaped backing body, which has an inner diameter considerably larger than the outer diameter of the tube under test, is provided with a ]-shaped notch at the inner corner of the side surface on the tube end insertion side, and a plurality of arc-shaped back-up pieces are inserted into the notch during normal times. When the backing body is reduced in diameter and brought into close contact with the pipe body, the backup pieces are arranged radially so that they join each other, and the backing body is connected to the backing body by a pin protruding from the center of the back of each backup piece. For a watertight retaining part of a steel pipe hydraulic testing machine, which is attached to the side surface, and has adapter pieces arranged and fixed to the backing main body notches of the adjacent interrogation parts of each of the back-up pieces. backing.