JPS597974Y2 - Raising equipment for steel pipe towers - Google Patents

Description

[Detailed description of the invention] This invention is a steel tower structure (hereinafter referred to as a steel pipe tower) using steel pipe main pillars for power transmission lines, broadcasting antennas, water tanks, advertising, etc.
This invention relates to a height raising device.

For example, in the case of power transmission line towers, in recent years, as urban areas have become overcrowded, buildings have been constructed close to existing power lines, making it necessary to raise the height of the power lines. are often seen.

In the past, various methods have been tried to raise the height of such steel towers. For example, a high bar-shaped steel pole is installed at the center of the steel tower, and the entire or upper part of the tower is suspended from the ground using wire or rope. In this method, there is a limit to the strength of the steel pole and the wire or rope to be lifted, so there is a drawback that there are limits to the size and height of the tower.

Alternatively, for example, a frame structure body may be provided outside the steel tower, and the upper beam supporting the upper steel tower may be raised up using a cylinder (Japanese Patent Publication No. 50-32526). The method of raising the upper part of the steel tower from below (Special Publication No. 48-26614) and attaching the tower legs below requires a large work site because the framework structure or body is installed outside the tower. In addition, both methods have disadvantages such as the stability of supporting the tower during construction, the safety of workers working at heights, and the time it takes to assemble the structure, so it is difficult to utilize the power transmission line tower. It is impossible to raise the height of the overhead wires as they are, and this has the disadvantage of requiring long-term power outages or temporary construction for bypass power transmission.

In order to solve these problems, the present applicant has developed a system that is highly safe during construction, can be raised while the tower is in use, for example, while the transmission line tower is in a live state, and can be applied to large towers. We previously proposed a method and device for raising the height of steel towers (Japanese Patent Application No. 1983-43890 dated April 10, 1971).

This method involves installing a fixed frame, an elevating frame, and a jack that moves the elevating frame up and down inside the steel tower, connecting and supporting the legs of the steel tower removed from the ground to the top of the elevating frame, and successively raising and lowering the elevating frame. The above-mentioned problem is solved by repeatedly adding to the frame and lifting the steel tower one by one, and then connecting the lower ends of the legs to the newly installed lower legs to raise the height of the steel tower.

In this method, especially when connecting the main column of the leg of the steel tower to the end of the connecting beam provided on the top surface of the elevating frame, for example, in the case of an angle steel tower, the side of the angle steel of the main column or the backing plate (gusset plate) is used. Although it is easy to pass bolts through the numerous bolt holes in a steel pipe tower and firmly connect it to the end of a connecting beam, it is extremely difficult to do so in the case of a steel pipe tower.

In other words, the joint flange of the main column steel pipe is considered to be the appropriate place to support the weight of the entire steel tower, but the connecting beam 6 on the top surface of the elevating frame that connects the end to this The joint flange 10 is supported by a pin 26 on the support column 23 of 4, so the joint flange 10 bends in the direction of rotation around this pin 26 due to the weight of the steel tower.
There is a risk that local forces may cause deformation, bending the main steel pipe in that area, or causing deformation such as denting.

Note that if the connecting beam 6 and the lifting frame 4 are rigidly connected instead of the pin 26, the amount of rotation will be reduced, but the bending of the main pillar steel pipe will further increase.

This invention was developed to solve the above-mentioned problem of connection support in steel pipe towers, and by arranging the connecting beams, especially the leg connection fittings at the ends, in a special structure, the tower can be made safer. It is an object of the present invention to provide a device for raising the height of a steel pipe tower, which does not cause deformation of the main pillar steel pipe, joint flange, etc. of the steel tower.

The present invention has a steel pipe tower 1 as shown in FIG.
A fixed pedestal 3 is installed inside the box-shaped frame body fixed to the ground, and the legs of the steel tower 1 are mounted on the upper surface of the box-shaped frame body that slides on the outside and moves in the vertical direction. The steel tower 1 removed from the ground is connected and supported by an elevating frame 4 provided with a connecting beam 6 connected to the section 2 and supporting the steel tower, and a jack 5 for raising and lowering the elevating frame 4. This is a device for raising the height of the steel tower 1 by sequentially raising and adding parts to the elevating platform 4, in which the connecting beam 6 is provided with leg connection fittings at each of the four ends, as shown in an example in FIG. 8, the leg connection fittings 8 have a hole in the center of each surface through which the main column steel pipe 9 of the steel tower 1 passes, as shown in FIG. 1
1, and three plates (referred to as P1, P2, and P3, shown from above) that are divisible at the hole, and are arranged in the direction of the main steel pipe with a predetermined surface spacing from each other; A splittable metal tube 12 inscribed and fixed in the holes 11 of the plates P1 and P2, and a splittable metal tube 13 inscribed and fixed in the holes 11 of the plate P3, The steel tower 1 is located between plates P2 and P3.
The joint flange 10 of the main pillar steel pipe 9 is positioned so that the plate }P. , P2, P3 are provided with a plurality of bolt holes 14 and 15 along two circumferences concentric with the hole 11, respectively, and bolt holes 14 and 15 are provided along the inner circumference thereof.
and bolts 17 that commonly pass through bolt holes 16 provided around the joint flange 10 to connect the three plates Px, P2, P3 and the joint flange 1.
0 are fixed together at a predetermined interval, and the three plates P1, P2, P3 are fixed together at a predetermined interval by bolts 18 that commonly pass through bolt holes 15 along the outer circumferences of the plates P1, P2, P3. The structure is such that a gap C is provided between the inner surface of the two metal pipes 12 and 13 inscribed in the plate and the outer periphery of the main column steel pipe 9 of the steel tower. This is a device for raising the height of a steel pipe tower, characterized in that the plays }Pi, P2, and P3 are respectively fixed to the ends of the connecting beam 6.

In this invention, a steel pipe tower refers to a tower for power transmission lines, broadcasting antennas, water tanks, advertising, etc. that uses steel pipes as its main pillar and is raised regardless of whether it is in use or not. For example, when constructing a steel tower, it includes a structure in which only the upper part of the tower is assembled in advance, and then the lower part is added by raising it up.

The present invention will be explained below by explaining a construction method for raising the height of a steel pipe tower using an embodiment of the steel pipe tower height raising device of the present invention.

Here, explanation will be given mainly by taking a steel pipe tower for power transmission lines (MC tower) as an example, but the present invention is not limited thereto.

Fig. 1 is a diagram showing an embodiment of the present invention, and Fig. A is a side view, Fig. 8 is a top view and side view showing details of the leg connection fitting 8 shown in Fig. A.

Figures 4A and 4B are structural diagrams shown in order of work steps to explain the method of raising the height of a steel pipe tower according to an embodiment of the present invention.

In the figure, reference numeral 1 denotes an existing steel pipe tower, in which a main column steel pipe 9 is used, which is connected by a joint flange 10.

19 (FIG. 4A) is a new lower leg that will become the lower part of the new leg after the tower 1 is raised, and is installed in advance on a strong new foundation outside the tower 1.

First, as shown in FIG. 1A, a steel pipe tower raising device 20 according to the present invention is installed inside the steel tower 1.

As shown in the figure, the lifting device 20 includes a fixed pedestal 3, an elevating pedestal 4, and a jack 5, for example, an electric jack.

The fixed pedestal 3 is formed from a box-shaped frame body having, for example, four pillars 21 at the four corners, and is firmly fixed with bolts onto a foundation 22 provided in advance.

The elevating pedestal 4 is made of a box-shaped frame body having four pillars 23 at the four corners, and the four pillars 23 are slid in the vertical direction on the outside of the four pillars 21 of the fixed pedestal, for example, by means of a roller or the like. It is configured to be movable.

A connecting beam 6 is provided on the upper surface of the elevating frame 4, and as shown in the top view in FIG. 2, this is a cross beam (cross beam).
A leg connection fitting 8 is provided at each of the four ends of the frame 7, and is supported by a pin 26 on a column 23 of an elevating frame.

Here, the reason why the connecting beam 6 is shaped like a cross is because of the leg connection fittings 8.
This is to ensure that it does not get in the way of the main column or diagonal members of the steel tower 1 when connecting it to the main column steel pipe 9 of the steel tower 1.

Further, a lower structure 25 (see Fig. 4) having four pillars of a predetermined height is successively attached to the lower flange 24 of the elevating frame 4.

One jack 5 is provided for each support, and its lower end is firmly supported on the ground, and its upper end is connected to connection parts 27 provided at predetermined intervals in the vertical direction of the support 23 of the elevating frame 4. , the elevating frame 4 is raised by the length of one stroke of the jack, and the connecting portion 27 is sequentially lowered to the lower connecting portion 2.
7 and if the height of the elevating frame 4 is insufficient,
A lower structure 25 is added below it as appropriate.

Once the installation of such a raising device 20 is completed, the connecting beam 6
After connecting and fixing the leg connection fittings 8 to the vicinity of the joint flange 10 of the main column steel pipe 9 of the steel tower 1, the lower end 29 of the leg part 2 of the steel tower 1 is removed from the ground, and the entire steel tower 1 is attached to the fixed frame 3 and the elevating frame. 4 to support it.

This leg connection fitting 8 is constructed as described above, but further explanation will be given below.

Speaking of the point where the legs 2 of the steel pipe tower 1 and the connecting beam 6 are connected, it is difficult to support the main steel pipe 9 in the middle of the pipe.
Although it is appropriate to use the joint flange 10 of the steel pipe 9, for example, a bolt hole 16 provided on the outer periphery of the flange 10 may be used.
If the ends of the connecting beams 6 are connected with bolts as shown in FIG. Therefore, in the present invention, as shown in Figure 1, Part 8, a uniform force is applied around the flange 10 by a plurality of bolts arranged concentrically in two rows around the steel pipe 9. The structure was designed so that it would be lifted up by a rope, so that local forces would not be applied.

In the figure, 28 indicates a rib of the seam flange 10.

The three plates P1, P2, and P3 each have a hole 11 through which the main steel pipe 9 passes, but since it is impossible to insert the steel pipe 9 into the hole 11 as it is, as shown in FIG. As shown in Figures 1 and 3, they are constructed so that they can be divided at the holes along lines 31, and are connected by backing plates 32.

In addition, two metal pipes (for example, steel pipes) 12 and 13, which are internally fixed to the plates P1, P2 and P3, respectively, are also shown in Figure 1, Part 8, in order to facilitate the insertion of the main column steel pipe 9. It is constructed so that it can be divided along the line 33 as a boundary.

Among these, the metal tube 12 is made of plastic. , P2 hole 1
1.11, and is inscribed in both seam flange 10
There is no problem even if it protrudes in the vertical direction to the extent that it does not interfere with the ribs 28.

For example, in the figure, it has a length that projects above the plate P1 from the lower surface of the plate P2.

Further, the metal tube 13 may be inscribed in the hole 11 of the plate P3 and similarly protrude in the vertical direction to the extent that it does not interfere with the rib 28. It has a certain quality.

The three plates P1, P2, P3 are inscribed with the metal tube 1.
2j3 and bolts 1-17.18, it is held at a predetermined interval, and also constitutes a sturdy support jig, with a gap C between it and the main steel pipe 9, and between the plates P2 and P3. The seam flange 1 is secured by the inner bolt 17.
0, the load of the steel tower 1 is supported by the leg connection fittings 8 in such a way that the flange 10 is lifted up with a uniform force.

In this way, a uniform support load is applied around the flange 10, so the flange 10 can sufficiently withstand the load of the steel tower 1.
Not deformed.

Figure 3 is a cross-sectional view showing the details of the relationship between the metal pipe 12.13 inscribed in Pt, P2, and P3 and the main steel pipe 9, and shows the space between the inner surface of the metal pipe 12.13 and the outer periphery of the steel pipe 9. One of the features of the present invention is that a gap C is provided between.

If there is no gap C, the metal pipe 12 or 13 of the steel pipe 9
As described above, a rotating force acting on the outer periphery in contact with the pin 26 that supports the connecting beam 6 acts as an axis, so when it was actually used, the main column steel pipe 9 was dented in this area.

By providing the gap C, the metal pipe 12, 13 and the steel pipe 9 do not come into direct contact with each other in actual use, so that the steel pipe 9 is not damaged.

This gap C is preferably 3 to 10 mm. For example, when the gap C was set to 7 mm and the displacement around the tower was measured after being used to raise the height of the steel tower, it was found to be less than about 3 mm, and it was found that a minimum of 3 mm is sufficient. It was.

Moreover, if it exceeds lQmm, it will only impair the stability of the support and there will be no further effect.

In addition, the intervals between the plates P1 and P2 and between P2 and P3 are appropriately determined based on the dimensions of the main steel pipe 9, the supporting load, the dimensions of the joint flange 10, the dimensions of the plates, etc.
When the outer diameter of is 165 mm, it is 250 to 400 mm.

The plates PL, P2, and P3 are fixed to the end of the connecting beam 6 or to a backing plate 30 (FIG. 1, 8) fixed to the end.

Furthermore, play 1-P. , P2, and P3 are appropriately provided with vertical ribs (not shown) on their surfaces in order to withstand large support loads.

After the steel pipe tower raising device 20 according to the present invention constructed as described above is installed inside the steel pipe tower 1, the lower end 29 of the leg 2 of the steel tower 1 is removed and the steel tower 1 is removed, as shown in FIG. The entire structure is supported by the raising device 20, and the raising and lowering platform 4 is successively raised by the jack 5 (FIG. 4A), and the lower structure 25 of the platform 4 is added as appropriate.
As shown in the figure, once the desired height is reached,
A newly installed additional leg 2' (dotted line) is installed between the lower end 29 of the leg of the existing steel tower 1 and the new lower leg 19.

After that, the raising device 20 is removed and the method of raising the height of the steel pipe tower is completed.

Note that all of these operations can be performed on the landing 31 provided on the fixed frame 3 or on the ground, so there is no need to work at heights, and the workers are safe.

The steel pipe tower elevating device according to the present invention constructed as described above has the following effects.

■ Since the connecting beam 6 of the elevating frame 4 is a cruciform beam with leg connection fittings 8 provided at each of the four ends, when connecting the leg connection fittings to the main column steel pipe of the steel tower, Easy to connect without getting in the way of columns or diagonals.

■ Since the leg connection fittings 8 are constructed as described above, 3
The plates P1, P2, and P3 (Fig.
According to 7.18, while maintaining a predetermined interval, a sturdy support jig is provided, and a gap C is provided between the main pillar steel pipe 9, and the inner plurality of Since the bolts 17 are firmly connected to the periphery of the joint flange 10, the load of the steel tower is supported by the leg connection fittings 8 in such a way that the periphery of the joint flange 10 is lifted with uniform force. The support load of the steel tower is applied uniformly around the steel tower 10, the flange 10 is not deformed, and the presence of the gap C prevents direct contact between the metal pipes 12 and 13 and the main steel pipe 9, so that the supporting part of the steel tower Even if a rotating force is applied around the pin 26 that supports the connecting beam 6, the two do not come into contact and the main pillar steel pipe 9 is not damaged.

■ Since the tower raising device is installed inside the steel pipe tower, it is possible to work inside the tower body, and less space is required for work.
Economical.

In addition, the steel tower raising device is a fixed frame constructed as described above,
Since the lifting trestle and the jack can be used, the lifting trestle can be raised and added to repeatedly, the trestle is strong, and even large steel towers can be operated stably and easily. Since it can be carried out at a relatively low location within the range and does not come close to live wires, it is extremely desirable for the safety of the work shell.

Also, for example, there is almost no oscillation of overhead power transmission lines.

Therefore, for example, it is possible to carry out elevation work while the steel pipe tower is still in use, such as with live overhead lines, and other temporary work is not required, so it is possible to achieve uninterrupted power outage and shorten the construction period. This has the advantage of significantly reducing costs.

[Brief explanation of drawings]

Fig. 1 is a diagram showing an embodiment of the present invention, and Fig. A is a side view, and Fig. 8 is a top view and side view showing details of the leg connection fitting shown in Fig. A. FIG. 2 is a top view of the connecting beam shown in FIG. 1. FIG. 3 is a cross-sectional view showing details of the relationship between the metal tube and the main column steel tube shown in FIG. Figures 4A and 4B are schematic diagrams shown in order of work steps to explain the method of elevating a steel pipe tower according to an embodiment of the present invention. 1... Steel pipe tower, 2... Legs, 2'.
...Additional leg part, 3...Fixed frame, 4
...Elevating frame, 5...Jack, 6.
...Tie beam, 7...Cross beam, 8...
... Leg connection fittings, 9 ... Prop steel pipe, 10
... Seam flange, 11 ... Hole, 1
2.13...Metal tube, 14,15.16...
... Bolt hole, 17.18 ... Bolt, 19
...New lower leg, 20... Steel pipe tower raising device, P1, P2, P3... Plate, C.
...Gap.

Claims (2)

[Scope of utility model registration request] (1) A fixed pedestal installed inside the steel pipe tower and fixed to the ground from a box-shaped frame body, and a box-shaped frame body that slides on the outside and moves in the vertical direction, The elevating frame is equipped with a connecting beam connected to the legs of the steel tower to support the steel tower, and a jack for raising and lowering the elevating frame. A device for raising the height of the steel tower by repeatedly raising the pedestal and adding parts, wherein the connecting beam is a cruciform beam with leg connection fittings provided at each of the four ends, and the leg connection fittings are: Three plates, each having a hole in the center of its surface through which the main column steel pipe of the steel tower passes, are arranged in the direction of the main column steel pipe with a predetermined distance from each other, and are divisible at the hole. Plates P1, P from above
2, P3), a splittable metal tube inscribed and fixed in the holes of the plates P1 and P2, and a splittable metal tube inscribed and fixed in the holes of the plate P3. The joint flange of the main column steel pipe of the steel tower is located between the plates P2 and P3, and the plates }Pi, P2, P3 are arranged along two circumferences concentric with the hole. A plurality of bolt holes are provided in each plate, and the three plates and the seam flange are connected at a predetermined interval by bolts that commonly pass through the bolt holes along the inner circumference and the bolt holes provided around the seam flange. The plates are held and fixed together at a predetermined interval by bolts that commonly pass through bolt holes along the outer circumferences of the three plates, and the plates are fixed together at a predetermined distance. A gap is provided between the inner surfaces of the two inscribed metal pipes and the outer periphery of the main column steel pipe of the steel tower, and the plates P1, P2 and P
3 are fixed to the ends of the connecting beams, respectively. (2) Raising the height of the steel pipe tower according to claim 1, wherein the gap between the inner surface of the two metal pipes inscribed in the plate and the outer periphery of the main steel pipe of the steel pipe tower is 3 to 10 mm. Device.