JPH03412Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a bottom plate removal device for removing a bottom plate placed on the bottom of the roadbed of a bridge such as an elevated road.

At the bottom of the bridge roadbed, a bottom plate made of galvanized steel plate is placed as a formwork material for concrete construction.If this bottom plate is left unused for a long time, there is a risk that it will corrode and fall to the ground. be. Therefore, after concrete construction, it is necessary to remove the bottom plate by cutting the fixed part of the bottom plate using a gas burner or the like. However, this work is dangerous and difficult because it has to be carried out at a high place, facing upwards, and there is also the problem that the durability of the roadbed section is impaired by the thermal effects of gas cutting.

This invention was made to solve the above problems, and it is possible to very easily separate the spot welds between the bridge subgrade bottom plate and the cross beam, and it also prevents the adverse effects of heat on the subgrade. To provide a bottom plate removal device capable of removing a subgrade bottom plate without causing damage.

That is, this invention consists of a pair of guide rails arranged parallel to each other, a slide rail arranged at right angles to the guide rails, a cart supported so as to be slidable along the slide rails, and a cart supported so as to be slidable along the slide rails. An electric drill installed above,
and a lifting operation means for raising and lowering the electric drill, the slide rail is supported so as to be slidable along the guide rail, and the tip of the electric drill is arranged upward, and a hole saw is attached to the tip. It is something that is made possible.

Embodiments of this invention will be described below with reference to the drawings. In FIGS. 1 and 2, reference numeral 1 indicates a pair of left and right guide rails with an I-shaped cross section that are arranged parallel to each other; 2 indicates a slide rail with an I-shaped cross section that is supported on the guide rail 1; and 3 indicates this slide rail 2. The cart 4 supported above is an electric drill installed on the cart 3. The slide rail 2 above is
A pair of guide rails 1 arranged parallel to each other on the left and right
The slide rail 1 is disposed perpendicularly to the slide rail 1 and is supported so as to be slidable along the slide rail 1. That is, running plates 20 extending in the width direction are fixed to the lower surfaces of both ends of the slide rail 2, and side plates 21, 21 protruding downward from both sides of the running plates 20 each have two moving plates. roller 22,
22 are provided to protrude inward, and the slide rail 2 is configured to run along the guide rail 1 when the moving roller 22 contacts the upper side of the guide rail 1 and rolls. -ing

The truck 3 includes a running frame consisting of a horizontal base plate 30 and side plates 31, 31 protruding downward from both sides of the horizontal base plate 30, and each of the side plates 31, 31 has four moving rollers 32 inside. It is protruded towards the direction. The moving rollers 32 are arranged so as to sandwich the upper side of the slide rail 2 from above and below, thereby supporting the carriage 3 so as to be slidable along the slide rail 2.

A slide bar 5 is erected on the base plate 30 of the truck 3, and an electric drill 4 is supported along the slide bar 5 so as to be movable up and down. That is, the board 50 of the slide bar 5 is placed on the trolley board 30, and the guide bar 5 is clamped by a pair of front and rear clamping plates 51 and mounting bolts 52. The electric drill 4 is supported so as to be movable up and down by externally fitting the slide portions 41, 41 of the electric drill mounting bracket 40 onto the slide bar 5.

Further, a mounting plate 53 is attached to the slide bar 5, and a lever 54 is attached to the shaft 5.
It is attached so that it can rotate around 5 as a fulcrum. The tip of the lever 54 is attached to the electric drill mounting bracket 4
A pair of upper and lower bars 42, 42 attached to the back side of 0
It is inserted and locked in between. By holding the rear end of the lever 54 and rotating it, the electric drill mounting bracket 40 is moved up and down, thereby raising and lowering the electric drill 4.

The electric drill 4 is fixed to a mounting bracket 40 with its tip facing upward, and a hole saw 43 is fixed to the tip of the electric drill 4.

A method of using the subgrade bottom plate removal device configured as described above will be explained. FIG. 3 shows a cross-sectional view of the bridge, in which a concrete subgrade section 7 is supported by girders 71 installed on the piers 70, and the bottom surface of the subgrade section 7 is provided with formwork material for concrete construction. A roadbed bottom plate 72 used as a roadbed is disposed. This roadbed bottom plate 72 is a horizontal beam 7 buried in the roadbed part 7.
3, and the side part of the haunch part 74 is attached to the upper surface of the girder 71 with a push bolt (not shown).
It is fixed by being pressed with something like.

In order to separate the spot weld between the cross beam 73 and the subgrade bottom plate 72 using the bottom plate removal device, first, as shown in FIG. Both left and right ends of the receiving material 11 are suspended from the upper end of the girder 71 by a hanging chain 12, and supported by a supporting member 13 erected at the lower end of the girder 71. do.

Then, guide rails 1 are placed on both the left and right ends of the receiving material 11, and the pair of left and right guide rails 1, 1 are arranged in the length direction of the bridge, respectively.
Both front and rear ends thereof are fixed to the receiving material 11 with U bolts 14 and push plates 15. In this case, vertical deflection of the guide rail 1 can be reliably prevented by making the front and rear end surfaces of each guide rail 1 contact the gusset plate of the girder member 71 to restrain its movement. .

Next, the running plates 20, 20 of the slide rail 2 are placed on the guide rails 1, 1, and the slide rail 2 is arranged in the width direction of the bridge, and the bogie 3 is attached to the slide rail 2.

Then, move the slide rail 2 above to the guide rail 1.
After aligning the bridge in the length direction by sliding it along the slide rail 2, slide the trolley 3 along the slide rail 2 to align it in the width direction of the bridge, and then move the hole saw 43 of the electric drill 4 to the cross beam 73. It is made to face the spot welded portion 75 with the roadbed bottom plate 72. After that, while driving the electric drill 4, the lever 5
4 is rotated to raise the electric drill 4, and the hole saw 43 cuts the area around the spot welded portion 75 of the bottom plate 72, thereby separating the joint between the cross beam 73 and the bottom plate 72. Thereafter, the bogie 3 is sequentially slid in the width direction of the bridge to cut off all the spot welds 75 to the first cross beam 73, and then the slide rail 2 is slid in the length direction to remove the second and second cross beams.
The spot welds 75 between the third cross beam 73 and the roadbed bottom plate 72 are separated in the same way.

After all the spot welds 75 between the bottom plate 72 and the cross beam 73 are separated by the above operation, the side parts of the bottom plate haunches 74 are cut along the girders 71 by other appropriate means. The bottom plate 72 is removed from the roadbed section 7.

By sliding the slide rail 2 and truck 3 as described above, it is possible to easily align the electric drill 4 with respect to the spot weld 75 located at an arbitrary position. Moreover, since the spot welds 75 for one cross beam 73 are usually arranged in a straight line in the width direction of the bridge, once the slide rail 2 is slid and the bridge is aligned in the length direction, it can be done later. By simply sliding the cart 3 along the slide rail 2, the electric drill 4 can be successively opposed to each spot weld 75 of the cross beam 73. Further, by simply raising the electric drill 4 using the lifting operation means such as the lever 54, the bottom plate 72 can be bored out and the spot welded portion 75 can be separated extremely easily, eliminating the need to perform complicated upward operations. The advantage is that there is no In addition, as in the case where the bottom plate 72 is cut using a gas burner, the roadbed portion 7
There is no adverse effect of heat on the

Note that the specific structure of each part according to this invention can be modified in various ways. For example, parallel links or various jacks may be used in place of the lifting/lowering operation means of the electric drill 4 consisting of the lever 54, slide bar 5, etc. good. Further, it is also possible to adopt a structure in which the slide rail 2 and the carriage 3 are provided with manual or electric slide driving means. Further, the method of installing the guide rail 1 is not limited to the above embodiment, and may be supported by a bracket or the like.

As explained above, this invention allows the spot welds between the subgrade bottom plate and the cross beams to be separated extremely easily without any complicated upward work, and the spot welds between the subgrade bottom plate and the cross beams can be separated without any thermal effects on the subgrade. This has the advantage that the floor bottom plate can be removed.

[Brief explanation of the drawing]

Figures 1 and 2 are side and front views showing an example of the bottom plate removal device according to this invention, Figure 3 is a cross-sectional view of a bridge, and Figure 4 is a sectional view showing an example of the use of the bottom plate removal device. It is. 1...Guide rail, 2...Slide rail,
3...Dolly, 4...Electric drill, 5...Slide bar, 43...Hole saw, 54...Lever.

Claims (1)

[Scope of utility model registration request] a pair of guide rails arranged parallel to each other,
A slide rail arranged perpendicular to the guide rail, a cart supported slidably along the slide rail, an electric drill installed on the cart, and a lifting operation means for raising and lowering the electric drill. and the slide rail is supported so as to be slidable along the guide rail, and the electric drill has a tip thereof facing upward, and a hole saw is attached to the tip of the electric drill. Roadbed bottom plate removal equipment.