JPH0211997Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a pipe end support device used, for example, in burying a gas pipe or the like.

[Conventional technology]

Currently, in construction work for burying gas pipelines, for example, the pipe joints are welded manually, so the area around the welded part is excavated wider than the normal excavation trench width in consideration of the work space. This part is called a meeting place, and welding work in this part tends to be automated, and in the case of automatic welding,
It is possible to eliminate this gap and perform automatic welding within the normal width of the excavated trench.

[Problem that the invention aims to solve] However, in this case, welding is performed in a narrow space, so the pipes are centered so that the end faces of the two pipes to be joined match, and the pipes are buried. There is a risk that the tube will be displaced from side to side and up and down as a result of being returned, making it impossible to join the next tube.

In other words, in the past, even if the pipe was displaced due to backfilling, it was only necessary to manually cut the pipe ends at the above-mentioned joints, but with the introduction of automatic welding and the removal of the joints, the above-mentioned cuts could be made. In addition, automatic welding work in which an automatic welding machine rotates along the outer circumferential surface of the abutting portion of the tube ends is also impossible due to space limitations.

Therefore, there was an urgent need to develop a pipe end support device to improve the accuracy of pipe centering.

The purpose of the present invention is to provide a pipe end support device that is attached to the pipe end of a backfilled pipe until it joins the next pipe to keep the pipe always in the center of the excavated trench, in order to prevent the pipe from moving due to backfilling. It's about doing.

[Means for solving problems]

The present invention consists of a holder 2 that fits into the end of a pipe 1 buried in an excavated trench, and a symmetrical jack 3 mounted horizontally on this holder 2. This jack 3 is driven by a central jack. A cylindrical body 21 is provided on the left and right sides of the portion 15, and slide nuts 22 are fitted into the left and right cylindrical bodies 21 so as to be non-rotatable in the circumferential direction and slidable in the axial direction. A pressing part 27 for the retaining plates 4 and 5 is provided at the tip, and the left and right screw grooves 32 and 33 of one screw shaft 31 are screwed into the left and right slide nuts 22 with left and right reverse threads and with equal left and right pitches. The central jack drive section 15 is a tube end support device in which a rotation transmission gear 40 integral with the screw shaft 31 is meshed with one rotary operation shaft 41 and a gear 42 integral therewith.

[Effect]

In the present invention, the screw shaft 31 is rotated by the rotary operation shaft 41, the slide nuts 22 and the pressing portions 27 on both the left and right sides are extended with equal strokes, and the center portions of the retaining plates 4 and 5 located on both the left and right sides of the tube end are rotated. A holder 2 is fixed to the holder 2, and the tube end is supported through the holder 2.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.

As shown in Fig. 1, a holder 2 is fitted to the end of a pipe 1 such as a gas conduit buried in an excavated trench, and a symmetrical jack 3 is mounted horizontally on the end face of the holder 2. , This jack 3 is attached to retaining plates 4, such as steel sheet piles, which are erected along both the left and right walls of the excavation trench.
It is made to operate telescopically between 5 and 5.

As shown in FIG. 2, the holder 2 has an upper part 6 and a lower part 7 formed by dividing a horizontal cylindrical body into upper and lower halves.
are rotatably connected by an opening/closing support shaft 8 on one side, and a pipe 1 is connected between the upper part 6 and the lower part 7.
To close them after inserting them, raise the threaded rod 10 provided on the other side of the lower part 7 so that it can rotate vertically by means of a shaft 9, and open the upper part 6 as shown in FIG.
The nut 12, which is fitted into the concave shape 11 integral with the concave piece 11 and screwed onto the threaded rod 10, is tightened onto the upper surface of the concave piece 11. Also, when opening the upper part 6 to attach or detach the holder 2 to the tube 1, tighten the nut 12.
, and rotate the threaded rod 10 downward to remove it from the concave piece 11.

Further, as shown in FIGS. 2 and 3, an end plate 13 is fixed to the end surface of the upper part 6 of the holder, and this end plate 1
3, a jack driving section 15 located at the center of the jack 3 is fixed by a holder 14 via a mounting plate 16. The attachment using the holder 14 is intended to allow the jack 3 to be commonly used for holders 2 of various diameters. Further, as shown in FIG. 3, a large square hole 17 is bored all around the holder 2 to reduce the weight of the device.

Next, as shown in FIGS. 4 and 5, the jack 3 is provided with cylindrical bodies 21 on the left and right sides of the central jack drive part 15, and
Long and hexagonal slide nuts 22 are fitted into the hexagonal fitting portions 23 of the right and left hexagonal fitting portions 23 so as to be unrotatable in the circumferential direction and slidable in the axial direction, respectively.
A housing part 24 is integrally screwed onto the tip of the housing part 2, and a spherical bearing 26 is provided inside this housing part 24 via a stopper collar 25, and the spherical bearing 26 presses the retaining plates 4 and 5. The spherical shaft portion 28 of the pressing disk 27 is rotatably held, and the slip preventing plate portion 29 is fitted onto the outer surface of the pressing disk 27. Furthermore, the screwing portion 35 of the left and right slide nuts 22 is 30 bearings integrated into
Left and right screw grooves 32, 33 of one screw shaft 31 rotatably held in a fixed position by
are screwed together with opposite threads on the left and right and with equal pitch on the left and right, and attach stoppers 3 to the left and right ends of this screw shaft 31.
4 is fixed, and this stopper 34 locks the threaded portion 35 of the slide nut 22. Further, a cover 36 integrally screwed onto the outer circumferential surface of the housing portion 24 is slidably fitted onto the outer circumferential surface of the cylindrical main body 21, and an O-ring 3 provided on the cover 36 is fitted.
7 to prevent water from entering the interior.

In the central jack drive section 15, a bevel gear 40 as a rotation transmission gear is integrally provided to the screw shaft 31 via a key 39 inside a gear case 38 formed by fixing the left and right cylindrical bodies 21. , A bevel gear 42 integral with one rotary operation shaft 41 is meshed with this bevel gear 40. The rotary operation shaft 41 is rotatably held by a metal member 43 and receives axial force by a thrust washer 44, and furthermore, as shown in FIGS. It is molded into a shape so that it can be rotated using a wrench, etc. Furthermore, lubricating oil is supplied to the inside of the gear case 38 through an oil supply plug, etc., and a cap with an O-ring fitted onto the rotary operating shaft 41 prevents the leakage of this oil to the outside and the intrusion of moisture etc. from the outside. 45 to prevent this. Note that the bevel gears 40 and 42 may be replaced by screw gears, worm gears, or the like.

Next, how to use this device will be explained.

First, the retaining plates 4 and 5 are installed on both left and right sides of the tip of a pipe 1 such as a gas conduit.

Then, attach the holder 2 of this device to the tip of the tube 1.
Attach it and operate Jatuki 3. This jack 3 rotates the screw shaft 31 via the bevel gears 42 and 40 by rotating the rotary operation shaft 41 with a wrench or the like, and moves the slide nuts 22 on both the left and right sides with equal strokes in the direction of separating them from each other. Then, the pressing disks 27 at the left and right ends are extended equally in opposite directions and pressed against the retaining plates 4 and 5, and the pipe 1 is cut to the width of the excavated groove (between the retaining plates 4 and 5 on both sides).
hold it in the center. At this time, the left and right pressing discs 2
7 is freely angular due to the structure of the spherical bearing 26, so even if the retaining plate has a slight angle, it can make sufficient surface contact with the retaining plate, and the wedge action of the screw groove of the screw shaft 31 Since the left and right pressing discs 27 are pressed against the retaining plate with a large force, there is a gap between the slip prevention plate portion 29 and the retaining plate to support the weight of the tube 1 and this device. Sufficient frictional force can be obtained.

In this state, the excavated trench is backfilled up to the tip of the pipe 1 including this device.

The next day, the area around the tip of the pipe 1 was re-excavated,
After removing this device and retaining plates 4 and 5 and installing a unit type retaining device (not shown) in their place,
The end of the tube 1 is brought into contact with the end of the next tube, and both are welded together using an automatic welding machine.

[Effect of idea]

According to the present invention, since the jacks that operate symmetrically by a single screw shaft with left and right reverse threads are mounted horizontally on the holder that fits into the pipe ends, the jacks move the pressing parts at both ends into the ridges on both the left and right sides. By pressing against the retaining plate, the pipe end can be supported via the holder in the center of the left and right retaining plates, preventing the pipe end from being displaced due to backfilling, and allowing the next pipe to be placed concentrically with the above pipe end. The joining work can be done easily. especially,
Since the left and right thread grooves of the screw shaft in the jack are left and right oppositely threaded and have equal pitch on the left and right sides, the left and right pressing portions are equally protruded and the holder can be accurately supported at the center of the retaining plates on both sides.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing one embodiment of the tube end support device of the present invention, Fig. 2 is a partially cutaway front view thereof, and Fig. 3
4 is a sectional view of the jack portion, and FIG. 5 is a sectional view taken along the line -- in FIG. 4. 1...tube, 2...holder, 3...jacket,
4, 5... Mountain retaining plate, 15... Jacket drive section, 2
1... Cylindrical body, 22... Slide nut, 27
... Pressing disk as a pressing part, 31 ... Screw shaft, 32, 33 ... Thread groove, 40, 42
...Bevel gear, 41...Rotary operation shaft.

Claims (1)

[Scope of utility model registration request] It consists of a holder that fits into the end of a pipe buried in an excavated trench, and a symmetrical jack attached horizontally to this holder. A slide nut is fitted into the left and right cylindrical bodies so as to be non-rotatable in the circumferential direction and slidable in the axial direction, and a pressing part for the retaining plate is provided at the tip of the left and right slide nuts. The left and right screw grooves of one screw shaft are screwed into the slide nut with left and right opposite threads and the right and left equal pitches, and the central jack drive section has a rotation transmission gear that is integrated with the screw shaft. A tube end support device characterized by being formed by meshing one rotary operation shaft with an integral gear.