JP3244927B2 - Penstock pipe roundness holding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a penstock-circularity holding device used for on-site installation of a penstock, which is used as a conduit for a hydroelectric power plant or a water storage dam.

[0002]

2. Description of the Related Art A penstock used for an intake pipe of a hydroelectric power plant is a steel plate having a thickness of 22 to 50 m / m and a diameter of 4 to 7 m / m.
m, made into a penstock with a length of about 9 to 12 m. The produced penstock is turned sideways, mounted on a carry-in car, and has a horizontal plane of about 50 mm
It is transported into a tunnel that is inclined at an angle of about °, and it is formed by assembling and assembling sequentially upward from the lowest position.

[0003] Therefore, the penstock mounted on the loading carriage is
It is carried into the tunnel with its deflection of about 150 to 400 m / m in the diameter direction due to its own weight, and is temporarily welded to the upper end face of the existing penstock below while aligning the lower end face of the introduced penstock. Work is being done.

[0004] The penstock mounted on the loading carriage is
When it is conveyed through a slope of as much as 50 °, it also bends in its longitudinal direction. In order to carry this work into the tunnel in a deflected state and perform temporary welding with the upper end of the existing penstock, the distance between the outside surface of the penstock and the bedrock must be six.
It is necessary to excavate the tunnel so that it becomes 00 mm or more to secure the carrying space and the working space. Recently, the space has been narrowed to 300 mm in order to reduce the man-hour for rock excavation and the cost of filling the space with cement. Is required. For this reason, the conventional method of carrying in a penstock with warping occurring, making the penstock brought in at the time of tack welding in a perfect circular state, and installing it in the rock becomes difficult, Or, even if the penstock can be maintained in a perfect circle state during the temporary welding, how to carry out the device for maintaining the perfect circle from the tunnel after the work is also a problem.

[0005]

SUMMARY OF THE INVENTION As described above, according to the present invention, the distance between the outer surface of a penstock laid in rock and the bedrock is reduced, and the penstock is drilled in a tunnel pierced into the bedrock. The cross-sectional shape of the penstock can be maintained in a perfect circular shape at the time of carrying in and tacking welding work because it is carried in and tack welded with the existing penstock, and after completion of tack welding work It is an object of the present invention to provide a penstock true round holding device which can be easily removed from a mine tunnel.

[0006]

For this reason, the penstock true roundness holding device of the present invention has the following means. (1) A carry-in vehicle that can travel in a tunnel pierced in the rock where the incoming penstock is to be laid, mounts the incoming penstock that is lying down, and transfers it to a position behind the existing penstock to be laid is provided. In this case, a track for moving the carry-in truck may be laid in the tunnel and run on the track. (2) A transport vehicle equipped with a traveling drive device for traveling in a mine tunnel and a connecting device capable of connecting to a rear end of the carry-in vehicle is provided at a front end. Like the carry-in vehicle, the carrier vehicle may be made to travel on the track. (3) While being placed on the transport trolley, the transport trolley is
When connected to the carry-in carriage equipped with the carry-in penstock, the connection with the carriage is released, and the carry-in pressure that travels in the axial direction on the inner peripheral surface of the carry-in penstock on the carry-in carriage and lays down at a predetermined position. A plurality of locations including the upper part of the inner peripheral surface of the iron pipe were pressed from the inside to make the cross-sectional shape of the incoming penstock substantially circular, and a perfect circular holder for maintaining the shape was provided.

[0007]

After the loading penstock has been mounted on the loading truck, the circular holder is connected, and the leading end of the loaded transport truck and the rear end of the loading truck are connected. Next, the connection between the carriage and the perfect circle holder is released, and the perfect circle holder is moved in the axial direction to a predetermined position in the penstock.

When the perfect circle holder reaches a position at which the carried penstock has a substantially perfect circle, it presses the inner peripheral surface of the carried penstock from inside. The pressing positions are a plurality of positions including the upper part of the inner peripheral surface where the deformation is the largest due to the influence of gravity. In this state, the incoming penstock is transferred to the rear of the existing penstock for performing tack welding work, and the front end of the penstock and the rear end of the existing penstock are tack-welded. Next, the perfect circle holder stops pressing the inner peripheral surface of the incoming penstock, is moved onto the carrier, is connected to the carrier, and is driven by the traveling drive device provided on the carrier, and the carrier and the penstock are carried. Is removed from the mine pit together with the empty loading carriage leaving the temporary welding position.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a hydraulic penstock holding device according to the present invention. 1 to 4 are side views showing one embodiment of a penstock true-circle holding device of the present invention. FIG. 1 is a temporary assembling site, in which a carry-in cart 5 loaded with a carry-in penstock 1 holds a perfect circle. FIG. 2 shows a situation in which the carriage 6 on which the tool 8 is mounted approaches, and FIG. 2 shows a large winch (not shown) up to the rear of the existing penstock 2 with the carried-in penstock 1 kept in a substantially perfect circle by the perfect-circle holder 8. FIG. 3 shows a state in which the lowering is carried out by a large winch rope 9 as a traveling drive device wound around the pipe, and FIG. After the tilting cylinder 15 is contracted and the upper pressing cylinder 12 is depressed to lower the center of gravity, the rope 11 is wound around the winch 10 as a moving device, so that the perfect circle holder 8 is formed.
FIG. 4 shows a state in which is stored in the fixture 7 of the carriage 6.
After the support rod (not shown) is driven into the rock 3 to fix the tack-welded carry-in penstock 1, the carry-in truck 5 releases the support of the carry-in penstock 1 and winds the large winch rope 9. This shows a situation in which the transport trolley 6, the carry-in trolley 5, and the perfect circle holder 8 are carried out to the temporary assembly site.

FIGS. 5 to 7 show cross sections taken along the line AA of FIG. 2, and show how the carried-in penstock 1 is brought into a substantially perfect circular state by the action of the perfect circular holder 8. .

In these figures, the carry-in truck 5 is constructed by connecting two carriages so that the carry-in penstock 1 is not derailed from the curved track of the rail 4. Further, the structure is such that the front end of the transport vehicle 6 can be connected by the connecting device 17. The fixing tool 7 provided on the transport trolley 6 has a structure in which the framework of the perfect circular holder 8 is fitted, and is fixed in a state where it is pulled by a winch 10 as a moving device provided on the transport trolley 6. A circle holder 8 in the U-shaped part of the tool 7
Is fitted, the perfect circle holder 8 is firmly fixed. In this state, the transporting trolley 6 and the loading trolley 5 are connected to the connecting device 1.
When connected by 7, a part of the perfect circle holder 8 is in a state of being carried into the penstock. In addition, the weight of the carriage 6 is sufficient to support the cantilever-supported perfect circular holder 8.

[0012] circularity holder 8 is for a true circle by pressing the cross-section of the carrying penstock 1 in three directions, 12 o'clock, 5
When the cylinder assembled at 7 o'clock position is
Are arranged in a two-row system with an interval of 2 to 3 m in the axial direction. Thereby, even when the transporting trolley 6 runs on the tunnel 18 formed in the rock 3 and having an inclination of 50 °, the perfect circular holder 8 can be correctly held in the axial direction of the incoming penstock 1.

[0013] Further, a 12 o'clock portion of the clock in the cylinder,
That is, the upper pressing cylinder 12 that presses the upper part of the inner peripheral surface of the incoming penstock 1 is connected by the connecting link 16, and the tilting cylinder 15 can be tilted during running to lower the center of gravity. Time can be stabilized.

The lower pressing cylinder 14 is lifted during transportation so that the wheel 13 provided adjacent to the lower pressing cylinder 14 carries the penstock 1.
Run in contact with the inner surface. As shown in FIG. 5 to FIG. 7, the lower pressing cylinder 14 is used to move the inner peripheral surface 5
It is arranged so as to be able to press the position at the time, and after running to a predetermined position in the axial direction of the penstock 1, it is extended to float the wheels 13 and put them into an operating state.

Next, after raising the upper pressing cylinder 12 which is correctly held in the axial direction of the carry-in penstock 1 in the radial direction, the cylinder is extended to hold the carry-in penstock 1 in a perfect circular state.

As described above, the carry-in penstock 1 mounted on the carry-in carriage 5 has the upper pressing cylinder 12 and the lower pressing cylinder 1 which are provided at two locations in the axial direction and three locations in the circumferential direction.
By pushing in a radial direction linearly with the jacks in the four directions 4, the carried penstock 1 can be approximated to a perfect circle. As shown in FIG. 5 to FIG. 7, a mold 19 corresponding to the arc of the inner diameter of the penstock 1 is fitted into the distal ends of the upper and lower pressing cylinders 12, 14, and the point pressing is performed by linear pressing.
An arc can be formed over a wide range.

In this embodiment, the lower pressing cylinder 14
Although the example in which the installation positions in the circumferential direction are set at 5 o'clock and 7 o'clock is shown, the present invention is not limited to this.

After the conveyed penstock 1 is transferred to the rear of the existing penstock 2 already installed in the tunnel 18, the tip of the penstock 1 and the rear of the penstock 2 The ends are contacted and tack welding is performed. After the tack welding, as shown in FIG. 3, the upper pressing cylinder 12 is tilted down by the tilting cylinder 15, and then the lower pressing cylinder 14 is retracted until the wheels 13 contact the inner peripheral surface of the penstock 1. After the winch 1 attached to the carrier 6
After fixing the perfect circle holder 8 on the transport trolley 6 with the lifting fixture 7 using the ropes 11 and the ropes 11, the transporter 6 and the carry-in trolley 5 are carried out to a temporary assembly plant by the large winch rope 9, and one process is performed. Work is completed.

[0019]

According to the apparatus for holding true roundness of a penstock according to the present invention, the following effects can be obtained by the structure shown in the claims. (1) Even in the inclined rock, the penstock brought into the installation place is not deformed in the diameter direction and the length direction, and can maintain a perfect circular state. (2) Even if the distance between the outer surface of the incoming penstock and the bedrock is narrow, the lower end of the incoming penstock and the upper end of the existing penstock can be positioned and welded in a perfectly circular state. (3) After assembly, the perfect circle holding device can be automatically and easily carried out of the assembled position.

As described above, the perfect circle holding device of the present invention can accurately assemble a penstock in a narrow sloped rock.
It can be performed efficiently and safely, and its effects are significant.

[Brief description of the drawings]

FIG. 1 is a side view showing an approach state of a carry-in truck and a transport truck as one embodiment of a penstock true round holding device of the present invention,

FIG. 2 is a side view showing the usage of the perfect circle holder of FIG. 1;

FIG. 3 is a side view showing a situation after tack welding of the embodiment shown in FIG. 1;

FIG. 4 is a side view showing a state of withdrawal after the operation of the embodiment shown in FIG. 1;

FIG. 5 is a front view showing the traveling of the perfect circle holder taken along the line AA in FIG. 2;

FIG. 6 is a front view of the true circle holder while the vehicle is running, as viewed from the direction of arrows BB in FIG. 2;

FIG. 7 is a front view at the time of fixing the perfect circle holder in the direction of arrow BB in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Conveyor penstock 2 Existing penstock 3 Rock 4 Rail 5 Carriage 6 Carriage 7 Fixture 8 Roundness holder 9 Large winch rope as traveling drive device 10 Winch as moving device 11 Rope 12 Upper pressing cylinder 13 Wheel 14 Cylinder for downward pressing 15 Cylinder for tilting 16 Link for connection 17 Connecting device 18 Tunnel 19 Formwork

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Hiroshi Shimoyama 2-1-1, Shinhama, Arai-machi, Takasago-shi, Hyogo Mitsubishi Heavy Industries, Ltd. Inside Takasago Research Institute (72) Inventor Shunzo Okabe 1-1-1, Wadazakicho, Hyogo-ku, Kobe-shi No. 1 Inside Mitsubishi Heavy Industries, Ltd.Kobe Shipyard (72) Inventor Masaru Ogasa 1-1, Wadazakicho, Hyogo-ku, Kobe City Inside Mitsubishi Heavy Industries, Ltd.Kobe Shipyard (72) Inventor Ryoichi Tatsumi Wadazaki, Hyogo-ku, Kobe City 1-1-1, Machi, Kobe Shipyard, Mitsubishi Heavy Industries, Ltd. (56) Reference: Japanese Utility Model Application No. 62-1777979 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) F16L 1/00 F16L 1/024

Claims (1)

(57) [Claims] Claims: 1. A transport penstock to be joined is transferred to the rear of an existing penstock laid in a bedrock, and in performing the joining, the deflection of the import penstock by its own weight is corrected.
In a penstock holding device for forming and holding a substantially perfect circular cross section, a carry-in truck for placing the carry-in penstock horizontally and transferring it to a joining position, a coupling device for coupling with the carry-in carriage, and traveling A transport trolley provided with a driving device, and an inner peripheral surface of the carry-in penstock which is mounted on the transport trolley and travels in the axial direction of the carry-in penstock when the carrier and the carry-in carriage are connected. A true-circle holding device for pressing a plurality of positions including the upper part of the penstock and holding the cross-section in a substantially circular shape.