JP3262246B2 - Temporary ladder device for large diameter pipe connection work - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ladder device temporarily installed on a horizontal member at a high place when constructing a power transmission tower, and contributes to work safety.

[0002]

2. Description of the Related Art When a transmission tower becomes large, it is necessary to connect a large-diameter pipe at a high place without a scaffold when assembling a horizontal member constituting the transmission tower. The worker on the existing pipe must align the flange with the adjacent pipe suspended by the crane and tighten the insertion bolt. In this case, the worker ties a lifeline to his waist and
However, it is extremely difficult to insert and tighten the bolts on the lower side of the pipe, and some measures have been required.

[0003]

A rod ladder is temporarily provided using a bolt hole in an end flange of an existing large diameter pipe.
Therefore, first, the rectangular main link is circumscribed to the large diameter pipe and fixed inside the flange. This fixing is suitable for the case where it is fixed alone near the upper part of the existing pipe, and the case where the connecting pipe hung by the crane is in contact with the existing pipe and the bolt can penetrate near the upper part of both flanges. The selected insertion member is adopted. In any case, the bracket is fixed to the end of the main link so that the mounting angle can be adjusted. A box having a box fixed to the top of the rod ladder is prepared in advance, the box is placed on a bracket, and a set pipe is passed through the box and fixed. Separately, as a safety device, both ends of a belt wound around a large-diameter pipe are locked to both ends of a main link, a fastening bag is interposed in the belt, and the large-diameter pipe is gripped by the belt.

[0004]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A case in which a ladder device is provided alone on an existing horizontal large-diameter pipe P will be described with reference to FIG. The pipes to be adjacent shall not be located. The rectangular main link 1 has a hole 1 at one end
a, a hole 1b is provided at the center. These two holes correspond to bolt holes drilled on the upper side and side of the flange F.
By setting the central hole as the elongated hole 1b, it is possible to cope with several types of flanges having different bolt hole intervals of the flange. The tubular sleeve 2 and the tapered bolt 3 shown in FIG. 2 are used as insertion members for the two holes. The sleeve 2 and the head are provided with notches 2a having a plurality of equal angles in the axial direction, and are inserted into the holes of the flange as shown in FIG. 2, and the remaining protruding portion 2b is provided with an outer diameter screw having a flange at the end. . One end of the tapered bolt 3 forms a tapered portion 3a capable of expanding the cut portion 2a, and the other end is a screw portion 3b. The sleeve 2 and the tapered bolt 3 are inserted into the holes 1a and 1b of the flange, and the main link 1
Is inserted, and nuts 4, 5, and 6 are screwed together. Nut 4
Is adjusted so that the end surface of the tapered portion 3a fits within the outer surface of the flange F. In this state, when the nut 5 is tightened, the tapered portion 3a spreads the cut portion 2a and is fixed to the flange hole. Finally, by tightening the nut 6, the main link 1 is held between the flange at the end of the sleeve and fixed to the flange F.

Returning to FIG. 1 again, the bracket 7 is formed by connecting upper and lower side members by flange members, and is previously pivotally connected to the main link 1 with pins 8. Push screws 9, 9 are screwed through upper and lower side members of the bracket 7, and constitute a mounting angle adjusting mechanism for pressing and fixing the main link from above and below so as to be adjustable in angle. The box 11 is fixed to the upper part of the rod ladder 10 and is placed on the bracket. The bar ladder 10 is provided with a plurality of footrests 10a. Set pipe 12
Penetrates vertically through the box 11 and the bracket 7 and immobilizes the bar ladder. Set pipe 12 has cam lever 1 at the top
2a, a rotation stopper 12b is provided at a lower portion, and when the cam lever is tilted down by a linking link (not shown) in the pipe, the stopper also protrudes laterally to prevent the stopper from being pulled out in both up and down directions.

The following belt-type safety device is added to make sure that the connection between the main link 1 and the pipe P does not become abnormal even if an unexpected accident occurs in the member inserted into the hole of the flange F.
In FIG. 1, the links 13 and 14 are locked at both ends of the main link 1. The tightening bag 15 is a commercially available product formed by connecting a base 15a and a ratchet lever 15b with a shaft 15c. The other end of the base 15a is engaged with the link 13 by a pin 16. One end of the belt 17 is locked by the pin 16, the end of the link 14 is passed through, the winding is wound around the pipe P, and the other end is connected to the shaft 15 c.
Is locked. The tube P is gripped by repeatedly tightening the lever 15b.

[0007] After the connecting bolts of the connecting pipe and the existing pipe are temporarily temporarily tightened, a final tightening operation is performed. In this case, since there is no hole for inserting the tubular sleeve 2, the temporarily tightened bolts as shown in FIG. A bolt 19 is connected to the projection 18 and used. The extension bolt 19 includes a screw hole 19a and a screw rod 19b that can be screwed into the protrusion. The main link 1 is inserted into the screw rod portion 19b, and nuts 21 and
2. Tighten and fix.

[0008]

The worker, who has become prone on the existing pipe, fixes the main link to the flange corresponding to the two flange holes on the top and side faces of the pipe within the reach of the worker. As described above, a bracket is fixed to the main link in advance, and a belt-type safety device is also attached. After fixing the main link, put the box integrated with the rod ladder on the bracket and fix it with the set pipe. When the mounting angle of the bar ladder is adjusted, it is performed by the bolts 9 of the mounting angle adjusting mechanism. Using this rod ladder, all other holes in the flange are bolted. When the rod ladder is attached to the existing pipe alone, after removing the rod ladder together with the insertion member, the two bolt holes 1a,
Since 1b becomes blank, a bolt penetrating both flanges is inserted into both holes.

[0009]

According to the present invention, the main link can be mounted using the two connection bolt holes of the large diameter pipe within a range where the hand of the worker on the existing large diameter pipe can easily reach, and the rod ladder can be installed. With this rod ladder as a foothold, other bolt holes can be easily reached in a reasonable posture, bolt tightening work can be performed without danger, and connection work of large diameter pipes of steel towers can be safely performed. it can.

[Brief description of the drawings]

FIG. 1 is a front view of the present invention.

FIG. 2 is a side view of the insertion member.

FIG. 3 is a side view of another embodiment of the insertion member.

FIG. 4 is an explanatory diagram of a work state.

[Description of Signs] 1 Main link 2 Sleeve 3 Taper bolt 4, 5, 6 Nut 7 Bracket 8 Pin 9 Set screw 10 Bar ladder 11 Box 12 Set pipe 13, 14 Link 15 Tightening bag 16 Pin 17 Belt 18 Bolt 19 Reinforced Bolts 20, 21, 22 Nuts

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) E04G 3/08 E04G 3/00 E04G 1/30 E04G 21/32 E04H 12/10 E06C 1/38

Claims (2)

(57) [Claims] 1. A main link having two bolt holes corresponding to adjacent connection bolt holes of a flange provided at an end of an existing large-diameter pipe horizontally supported and constituting a power transmission tower, and a bolt of the main link. A tubular sleeve having a plurality of cuts in the axial direction provided at one end thereof around the axis, being inserted into the connection bolt holes of the flange, and having a threaded portion formed on the outer peripheral surface thereof; And a tapered bolt having a tapered portion at one end for expanding the diameter of the sleeve by cutting to prevent it from falling out of the connection bolt hole of the flange, and screwed to the tapered bolt and abutted against the other end of the sleeve, A nut for moving the taper bolt relative to the sleeve and a bracket fixed to the main link so that the mounting angle can be adjusted; With the rod attached to the large diameter pipe, projecting downward from the large diameter pipe, and having a rod ladder with multiple footrests. A temporary ladder device for connecting large-diameter pipes, which is to be withdrawn later. 2. A main link having two bolt holes corresponding to connection bolt holes adjacent to a flange at an end of an existing large-diameter pipe horizontally supported and constituting a power transmission tower, and an existing large-diameter at one end. A connecting hole for screwing and connecting to a connecting bolt for connecting the diameter pipe and the connecting pipe, a connecting bolt which penetrates through the main link and is prevented from coming off, and adjusts a mounting angle with respect to the main link. And a bar ladder fixed detachably to the bracket, detachably fixed to the bracket, extending downward from the large-diameter pipe with the main link attached to the large-diameter pipe, and having a plurality of footrests. A temporary ladder device for connecting large diameter pipes, wherein bolting work of a flange of a diameter pipe is performed by shifting to a rod ladder and then withdrawn.