JPS5941270Y2 - Intermediate jack station for steel pipe propulsion - Google Patents

Description

[Detailed description of the invention] This invention relates to an intermediate jacking station for underground propulsion of steel pipes 4, which allows high-quality pipe joints to be made without damaging the inner surface of the main pipe when attaching and removing fittings. It is possible to achieve all kinds of station gold with the objective.

Steel pipes □In order to propel long-distance wheels, the thrust force is insufficient or the steel pipes buckle if only the main jacks in the shaft are used, so a jacking station is installed in the middle of the propulsion steel pipes.
A fully removable intermediate jack is installed here, and this can be fed during auxiliary propulsion operations.

FIG. 1 is an explanatory diagram of a conventionally known intermediate jacking station, and A is a cross-sectional view showing a state in which the device is attached to the leading propulsion tube P1 and the trailing propulsion tube P2, and the opening is connected to the leading propulsion tube P1. It is a cross-sectional view showing a state 4 in which each end face 4 of the trailing propulsion pipe P2 is in contact and the welding sound of the part is completed.

In the figure, a pad ring 2a1.2a2 reinforced by a fitting ridge 2b1.2b2 is secured to each end face of the leading propulsion tube P1 and the trailing propulsion tube P2. An external collar 1 is attached to the leading propulsion tube P□, and a stopper 3 and a gasket 4 are attached to the trailing propulsion tube P2.

The leading propulsion tube P1 and the trailing propulsion tube P2 are close to each other at a predetermined interval, and there are pad rings 2a1 and 2 fixed to the end surfaces of both tubes.
A2 is propelled by attaching an intermediate jack (not shown) to the intermediate gap in the opposing position, and at a position where the a2 has been propelled a predetermined distance, the entire intermediate propulsion operation is performed.

After the intermediate propulsion operation is completed, the leading propulsion pipe PIs and the trailing propulsion pipe P
and the welded part (inside the corner) 2c with lips 2b1 and 2b2
Each padding ring 2a is cut by melting into 1s2c2.
□, 2 a 2 k are separated, and as shown in the diagram, the trailing propulsion tube P2 is gradually advanced, and the end surfaces of the cylindrical advancement tubes P 1 and P 2 are brought into contact with metal, and the contact surfaces are fully welded. There is.

According to such a conventionally known method, the rib 2b□2b2
'The vertebral progression canal P1. To leave from P2, corner inside 2
Since it is necessary to melt the gold around C1t2e2, there is a risk of damage to the inner surface of the main pipe, especially for small and medium diameter pipes, which requires skilled work, and even for large diameter pipes, it takes a considerable amount of time to finish the work after melting. Ta.

However, this method did not have sufficient water-stopping properties, and in spring ponds, both efficiency and quality tended to decline.

Here, the present invention seeks to provide an intermediate jacking station that does not have these drawbacks of the prior art.

In the present invention, a first short tube is fixed to the end of the trailing propulsion tube, and first and second stoppers 4 are provided on the outer periphery of this short tube, and a At the same time, a ring is inserted around the outer circumference of the short tube, and a collar that is long enough to cover the first and second stopper chambers is fully attached. The main feature of the metal structure is that a ring-shaped backing metal plate is interposed so as to span both the first short pipe and the second short pipe.

Figure 2 shows a cross-section of the device related to the present invention when it is attached to all propulsion tubes and after intermediate propulsion, the ends of the short tubes 5 and 6 fixed to each propulsion tube are cut and abutted, and welding is completed. figure,
FIG. 3 is an enlarged view of section A in FIG. 2, and FIGS. 4 to 8 are explanatory diagrams showing how to use the apparatus according to the present invention.

In these figures, short tubes 5 and 6 of the same diameter, thickness, and material as these main tubes are fixed to the rear end of the leading propulsion tube P□ and the tube end of the trailing propulsion tube P2, respectively. There is.

On the outer surface of the short tube 5 near the tube end, a ring 52 having a needle surface 52ak inclined forward on the upper surface is mounted, and a collar 54 is mounted around the ring through an annular distance screw 53. One side of 52 and the end surfaces of distance piece 53 and collar 54 are fixed.

The distance piece 53 is fixed at a position set back by a predetermined distance L1 (see FIG. 6) from the end of the short pipe 5 before the end is cut, and has a predetermined distance between the collar 54 and the outer surface of the short pipe 5. This can be done by maintaining the gap W14.

The collar 54 is a cylinder with a predetermined width W2 whose other end protrudes from the end of the short tube 5 by a predetermined dimension (elongated), and the protruding end has a ring-shaped band made of waterproof elastic material made of rubber, for example. An earth and sand inflow prevention belt 55 is fixed.

An annular band-shaped stopper ring 56 (see FIGS. 4 and 5) is fixed to the end surface of the short pipe 5 before the end is cut in a direction perpendicular to the tube axis, and a ring is attached at multiple locations on the back side of the stopper ring 56. A reinforcing lip 57 is fixed in contact with the inner surface of the short tube 5 and the stopper ring 56.

The outer surface of the short pipe 7 has a required dimension L from the pipe end before cutting the end.
5 s L 6 (see Figure 6) each with a thickness of I2. on separate outer surfaces. I3 and ring-shaped stopper 62.6
3 is fixed, and the front part of each is ring-shaped and waterproof.
Elastic gaskets 64 and 65 are slidably mounted around the ring.

In the front end view of the short tube 6 before the end is cut, an annular support ring 66 (see FIGS. 4 and 5) is fixed in a direction perpendicular to the tube axis, and a reinforcing 1" I4 rib 67 is fixed. Guaranteed ring 6
6 and the inner surface of the short tube 6 and is fixed thereto.

The abutment ring 56 and the abutment ring 66 have substantially the same shape and face each other, and the intermediate jack 8 is fitted between them.

The backing metal 7 is inserted so as to span the short pipes 5 and 6 after the intermediate propulsion work is completed, and has a predetermined width W3,
It is a ring-shaped metal band having a predetermined thickness I4, and is divided into a plurality of pieces in the tube axis direction.

Here, the width W3 of this backing metal 7 is the dimension L1 described later.
, is smaller than that of L3. When the backing metal 7 is ring-mounted as shown in FIG.
3, and the other end comes into contact with a stopper 63 through a gasket 65.

Furthermore, the thicknesses of the stoppers 62 and 63, I2 and I3, are these? A short encircled tube 6 is selected to fit inside the collar 54 and to be able to slide freely.

The width W2 of the collar 54 and the dimensions L 2 and L 3 from the end face of each short pipe after cutting the end to the distance L □ stopper 62.63 at the distance piece 531 are determined by the width W2 of the collar 54 and the dimensions L 2 and L 3 from the end surface after cutting the end of each short pipe to the dimension L □ stopper 62.63 during the expansion and contraction of the intermediate jack 8 and In relation to the width W3 of the backing metal 7, it is assumed that the design is such that the device can be operated smoothly.

The operation of the apparatus constructed in this way will now be explained with reference to all of FIGS. 4 to 8.

In the propulsion side shaft, the rear end of the preceding propulsion pipe P1 and the short pipe 5
Welded the tip of the trailing propulsion tube P2 and the short tube 6.
Weld the rear end.

Next, the entire tip of the short tube 6 is inserted into the collar 54 of the short tube 5, and a plurality of intermediate jacks 84 are attached to the abutment ring 66 or 56 with the entire interval between one abutment ring 56 and the other abutment ring 660. The cylinder is removably fixed in parallel with the rearward propulsion tube Pzk so that the front surface of the cylinder comes into contact with the opposing abutment ring 56 or 66, and the trailing propulsion tube Pzk is pressed and propelled by a pusher jack (not shown) (fourth (see figure).

When the device reaches a predetermined position underground, the intermediate jack 82 is activated to propel the advance propulsion pipe P1 by the required amount (
(Refer to Fig. 5), the rearward propulsion pipe P24 is propelled by the main push jack, and at the same time, the cylinder of the extended intermediate jack 8 is fully retracted.

These operations are no different from those of the prior art.

After the intermediate propulsion work is completed, the parts indicated by broken lines in FIG.
, 67, the rear part of the short pipe 5 and the front part of the short pipe 6 are cut by melting so that the end faces are perpendicular to the fixed pipe axis.

The fusing at this time is the dimensions L, L2, L3 k shown in the diagram.
made to hold.

Next, as shown in FIG. 7, the backing metal 74, which has been divided into a plurality of pieces from this tube end gap, is ringed to the gap (width W1) between the outer surface of the short tube 5 after cutting and the collar 54.

Next, as shown in FIG. 8, the transfer propulsion pipe P2 is gradually advanced in the direction shown by the arrow, and the cut end surfaces of the short pipes 5 and 6 come into contact with each other.

In this way, the part of the backing metal 7 having the width W3 that protrudes from the short tube 5 is inserted into the gap (width ■') between the outer surface of the short tube 6 and the inner surface of the collar 54, and the backing metal 7 is attached to both the short pipe 5 and the short pipe 6, and the distance piece 53 is placed on one end face.
The gasket 65 is held between the other end surface and the stopper 63, and the metal is pressed with an appropriate force.

Finally, the contact portions 21 of the short pipes 5 and 6 are completely welded to complete the work.

Here, the inflow of earth, sand, groundwater, etc. from outside the pipe can be completely prevented by the earth and sand inflow prevention band 55° packing 64, 65, etc., so welding of the abutment part of the short pipes 5 and 60 is performed using the backing metal 7. It can be performed well in conjunction with Eida.

As explained above, according to the device related to the present invention,
A good joint can be obtained without damaging the inner surface of the main pipe 4 or requiring a large amount of time 4 to repair it due to the removal of the retaining ring and its reinforcing rib metal as in the conventional technology. The effect is extremely large.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventionally known intermediate jacking station, where A is a cross-sectional view of the device mounted on the leading and trailing propulsion tubes, and the opening is each end face of the leading and trailing propulsion tubes. Cross-sectional view 4 showing state 4 of complete abutment and core welding;
Fig. 2 is a cross-sectional view showing a state in which the device according to the present invention is attached to a constant propulsion tube, and after intermediate propulsion, the ends of each short tube are cut and abutted, and welding is completed. An enlarged view of part A in the figure, and FIGS. 4 to 8 are explanatory diagrams showing the condolence money of the device related to the present invention. FIG. Fig. 5 is a cross-sectional view showing the state in which the jacks are fully installed. Fig. 5 is a cross-sectional view of the cylinder 4 of the intermediate jack in a state where it has been stretched due to extension. Fig. 6 is a cross-sectional view showing the state in which the top of each short pipe is cut 7 is a cross-sectional view of the gold stone with the backing ring attached to the four short pipes, and Figure 8 is a cross-sectional view of the gold stone with the end face of each short pipe after cutting and the welding sound at the core has been completed. It is. Pl... Leading propulsion tube, P2... Trailing propulsion tube 55°6... Short tube, 52... Ring, 53... Distance Piece, 54...
... Color, 55 ... Sediment inflow prevention zone, 56
,66...Attaching ring,57,67...
・Reinforcement riff, 62, 63...Stopper, 64
゜65...Patsukin, 7...Backing money,
8... Intermediate jack, 21... Welded part.

Claims (1)

[Scope of utility model registration request] a first short tube fixed to the tube end of the trailing propulsion tube;
first and second stoppers provided on the outer surface of the short tube;
a second short tube fixed to the rear end of the leading propulsion tube;
The ring is jointly attached to the outer diameter of the short pipe, and the first
．． a collar having a length sufficient to cover the second stopper 4, and a first stopper interposed inside the first and second stoppers and the collar. An intermediate jacking station during steel pipe propulsion, which is completely equipped with a second packing and a ring-shaped backing metal installed in a gap between the first packing and the base of the collar.