JPH0422514A - Device for correcting strain of bridge beam material - Google Patents

Abstract

PURPOSE:To move the hydraulic cylinder to the arbitary position of the web of the bridge beam material and to correct the strain of the web by moving the track forth and back and elevating/lowering the hydraulic cylinder upward and downward. CONSTITUTION:By adjusting the position of the hydraulic cylinder, making the position of die D1 in correspondence with the position of the horizontal stiffener, and successively, extending the hydraulic cylinder 21, bringing the die D1 in contact with both surfaces of the web and applying the adequate pressure in this state, the web can be strained to the opposite direction of the welded strain. Successively, by contracting the hydraulic cylinder 21, the die D1 is separated from the web, the strain of the web is simply corrected.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a bridge girder material strain correction device for highly efficiently removing welding distortion that occurs in a web when horizontal stiffeners or vertical stiffeners are installed on a large bridge girder material. Regarding.

Conventional technology A typical structure of a large-sized bridge girder material W is to provide flanges W2, W2 on both the upper and lower end surfaces of the web W1, and horizontal stiffeners W3, W3..., vertical stiffeners W4, etc. on one side of the web interface. W4... is provided, and the cross section is formed into a ■ shape (Fig. 4). In addition, the bridge girder material W may include crossbeam brackets W5, gussets W6, W6, etc. as necessary.
・It is common to provide Such bridge girder material W is
It is not uncommon to find large ones with a girder length L≧20 (m) and a girder height H≧3 (m).

All such bridge girder materials W are assembled using a welded structure. Therefore, in particular, the horizontal stiffeners W3, W3
..., when installing the vertical stiffeners W4, W4..., the welding distortion generated in the web W1 cannot be ignored,
Correcting the distortion is essential.

That is, generally horizontal stiffeners W3, W3...
When the vertical stiffeners W4, W4, etc. are welded, welding distortion occurs in the web Wl such that the mounting surface side is depressed and the non-mounting surface side bulges, so a gas burner etc. is used to weld the horizontal stiffeners W3, W3...・, Vertical stiffener W
4, W4... must be locally heated from the side opposite to the mounting surface along each longitudinal direction to remove this distortion.

Problems to be Solved by the Invention With such conventional technology, the distortion correction work is all done manually, so the work requires a high degree of skill and the work efficiency is low.Therefore, the present invention has solved the problem. In view of the problems of the conventional technology, the purpose of this is to mount a hydraulic cylinder on a truck that moves back and forth,
To provide a strain straightening device for a bridge girder material which enables even an unskilled worker to perform strain straightening work extremely efficiently by applying pressure by pinching a predetermined part of a web using this hydraulic cylinder.

Means for Solving the Problems The present invention has a configuration that includes a gate-shaped truck that moves back and forth across the bridge girder, and a pair of trucks that are mounted on this truck and that move up and down while facing horizontally. The gist of the hydraulic cylinder is to sandwich and press the web of the bridge girder material through the mold.

Note that the truck may be provided with an operation step that moves up and down together with the hydraulic cylinder when the hydraulic cylinder rises above a certain height, and furthermore, the hydraulic cylinder may have an intermediate stop position.

Effect When using such a configuration, first, by moving the truck in the front and back direction and raising and lowering the hydraulic cylinder in the vertical direction,
The hydraulic cylinder can be moved to any position on the web of the bridge girder material, and at this time, the hydraulic cylinders face each other from both sides of the web so as to sandwich the web. Therefore, by extending the hydraulic cylinders on both sides in this state, pressure can be applied from both sides of the web, and the distortion of the web can be corrected. In addition, one hydraulic cylinder is equipped with a U-shaped mold that straddles the horizontal stiffener and vertical stiffener and abuts on both sides, and the other hydraulic cylinder is equipped with a U-shaped mold that straddles the horizontal stiffener and vertical stiffener and is in contact with both sides of the stiffener. It is recommended to install a vertically long mold.

If the trolley is equipped with an operating step, even if the girder height of the bridge girder material is several meters or more, the worker can easily move the trolley and the hydraulic cylinder to a predetermined position by riding on the operating step. It is possible to position.

When the hydraulic cylinder has an intermediate stop position, the position of the cart and hydraulic cylinder can be changed by retracting the mold to the intermediate stop position instead of retracting the mold to the retraction limit, further improving work efficiency. I can do it.

Example Examples will be described below with reference to the drawings.

The bridge girder material strain correction device includes a gate-shaped truck 10 and hydraulic cylinders 21 and 21 mounted on the truck 10 via cylinder units 20, 20 (FIGS. 1 and 2). However, only one of the hydraulic cylinders 21.21 is illustrated here.

The truck 10 is formed by combining legs 11.11 and horizontal girders 12 in a gate shape, and as a whole has guide rails GR, GR.
You can move forward and backward on the top. Further, the guide rails GR, GR are laid parallel to each other on a floor (not shown) via connecting members GRa, GRa, . . . .

At the base of the legs 11.11, auxiliary stands 13a, 13a are provided in the front and rear directions, respectively, and on each auxiliary stand 13a,
It is equipped with a travel motor M1.

The travel motor M1 drives a drive roller 14 that moves on the guide rail GR, and a bumper 13a1 is attached to the auxiliary stand 13a.

Moreover, a hydraulic unit M2 is mounted on the upper part of the auxiliary stand 13a of one leg 11 via another auxiliary stand 13b.

On the horizontal girder 12 is a lifting motor M with a speed reduction mechanism Maa.
3 is installed. In addition, the legs 11.11 are provided with operation steps 15.15 that can be raised and lowered, and each operation step 15 is equipped with an operation box 15a.
A bumper 15b is attached.

The cylinder unit 20.20 is mounted on the leg 11.11 so as to be able to be raised and lowered (FIG. 2). The legs 11 are each provided with members in which plate-shaped and channel-shaped structural members 11a and llb are stacked on the front side and the rear side, and are erected on a base member 11C111c. However, in the figure, only a part of one of the structural members 11a and llb is illustrated. Therefore, the cylinder unit 20 is housed between the front and rear structural members 118% 11a, and is suspended by chains 20a, 20a.

After the chains 20a, 20a connect one end to the cylinder unit 20 from above, they are wound around the sub-blocks (20al, 20al) on the horizontal girder 12 and hang downward, and the chains 20a, 20a are connected to the guide 20 on the base member 11C111C.
a2. It is folded back upward via 20a2 and connected to the cylinder unit 20 from below. That is,
The chains 20a, 20a are endlessly connected via the cylinder unit 20. One of the sprockets 20al and 20al corresponding to each chain 20a is connected to a speed reduction mechanism M3a via a drive shaft 20a3. However, it is assumed that the drive shaft 20a8 and the speed reduction mechanism M3a are connected via a suitable transmission mechanism including the transmission shaft 20a4 (FIG. 1).

The cylinder unit 20 is constructed by assembling front and rear frame plates 22.22 and left and right side plates 23.23 into a box shape (FIG. 2), and housing the hydraulic cylinder 21 inside. The rod 21H of the hydraulic cylinder 21 has guide rods 24a and 24.
A support plate 24 with a is attached, and the support plate 2
A mold bracket 25 is fixed to the center of the mold bracket 4 via a pedestal 25a. A mold D1 is attached to the mold bracket 25, and the mold D1 can be rotated at any angle and attached to or removed from the mold bracket 25 by loosening the setscrew 25b.

Frame plate 22.22 and side plate 23.2 of cylinder unit 20
3 includes structural members 11a111b, ll forming the legs 11.
Guide rollers 20b and 2 that contact a and llb and transfer
0b..., and the cylinder unit 20 can freely move up and down inside the leg 1.1 via the chains 20a, 20a. In addition, the support plate 24 includes a dog 2
A dog rod 26 having a diameter 6a is attached, and when the hydraulic cylinder 21 expands or contracts, the dog 26a operates a limit switch LS, thereby detecting the intermediate stop position of the hydraulic cylinder 21.

A hook 22a122a is provided protruding from the upper end surface of the frame plate 22.22. The hooks 22a, 22a engage from below with a handle 15c erected on the operation step 15, and can lift the operation step 15 upward when the cylinder unit 20 rises above a certain height.

Chain 20a that lifts and lowers cylinder unit 20.20
, 20a... are driven by a common deceleration mechanism M3a and lifting motor M3, so the cylinder units 20., 20a, . . .
20 can be raised and lowered while always maintaining the same height,
Therefore, the hydraulic cylinders 21.21 can be raised and lowered while always facing each other horizontally. However, one of the hydraulic cylinders 21 is equipped with the above-mentioned vertically long mold D1,
The other hydraulic cylinder 21 is equipped with a U-shaped mold D2 (FIG. 1).

In addition to the control box 16, the leg 11 is provided with a cable drum 17 for connecting hydraulic hoses, electric wire cables, etc. to the cylinder unit 20.
Connection boxes 18, 18... are arranged.

The assembled bridge girder material W is installed on a pedestal (not shown) and fixed in the middle of the guide rail GRSGR (first
figure). At this time, the center of the flange W2 on the lower side of the bridge girder material W is the guide rail GR.

It is assumed that it is fixed so as to coincide with the center line CL of GR. In addition, the bridge girder material W has a horizontal stiffener W (not shown).
3. The mounting surfaces of the vertical stiffeners W3, W4, W4, etc. are directed toward the mold D2, and the non-mounting surfaces are directed toward the mold D1. At this time, the trolley 10 moves the bridge girder material W
The hydraulic cylinder 2121 can move back and forth on the guide rails GR, GR so as to straddle the cylinder units 20 and 20. Furthermore, the hydraulic cylinder 2121 can take an arbitrary height position by raising and lowering the cylinder unit 20.20. Therefore, by adjusting the horizontal position of the truck 10 and the height position of the cylinder unit 20.20, the hydraulic cylinder 21.21 can sandwich the web W1 of the bridge girder material W and move to an arbitrary position.

Generally, the web W1 of the bridge girder material W is deformed at the location where the horizontal stiffener W3 (or vertical stiffener W4) is attached due to welding distortion so that the mounting surface side of those members is depressed and the opposite mounting surface side bulges out. (Figure 3)
A)). Therefore, the position of the hydraulic cylinder 21.21 is adjusted so that the molds D1 and D2 correspond to the position of the horizontal stiffener W3 (FIG. 2(B)), and then the hydraulic cylinder 21.21 is extended. Then, if the molds D1 and D2 are brought into contact with both sides of the web W1 (see figure (C)), and appropriate pressing forces P and P are applied in this state, the web W1 will be distorted in the opposite direction to the welding distortion. You can do it. Next, by shortening the hydraulic cylinders 21 and 21, the molds D1 and D2 are separated from the web W1, and the distortion of the web W1 can be easily corrected ((D) in the same figure). In addition, mold D at this time
1 and D2, the former is set in a direction that coincides with the longitudinal direction of the horizontal stiffener W3, and the latter is set in a direction that straddles the horizontal stiffener W3.

In this way, after the distortion of the web W1 is corrected at a specific location along the longitudinal direction of the horizontal stiffener W3, the molds D1, D2 are moved by moving the cart 10 by an amount approximately corresponding to the length of the molds Di, D2. , hydraulic cylinder 21.
21 can be moved in the longitudinal direction of the horizontal stiffener W3, so in the same manner, along the installation length of all the horizontal stiffeners W3, W3...
All you have to do is correct the distortion of the web W1 (see Figure 4).
.

Moreover, by rotating the molds DI and D2 900 times and repeating the same operation for the vertical stiffeners W4, W4, etc., all the distortion correction operations for the web WI can be completed. However, in this case, in the longitudinal direction of the vertical stiffener W4, the cylinder unit 1-20
．． In order to raise and lower the vertical stiffener 20 and move it to another adjacent vertical stiffener W4, the pressing position is changed by moving the cart 1o.

Along the longitudinal direction of horizontal stiffeners W3, W3... or vertical stiffeners W4, W4..., molds D1, D
2. When moving the pressing position by the hydraulic flange 21.21, the hydraulic cylinder 2 is moved every 1 cycle.
1.21 needs to be expanded or contracted.

Generally, the required extension/contraction stroke at this time is sufficient to be on the order of several σ, so the hydraulic cylinders 21, 21 are provided with an intermediate stop position by the limit switch LS of the dog 26a1, and the extension/contraction stroke during movement is Type DI
, D2 may be short from the position where they contact the web W1 to the intermediate stop position. However, mold Di
, D2 move over the horizontal stiffener W3, vertical stiffener W4, etc., the molds D1, D2, and hydraulic cylinders 21, 21 shall be sufficiently retreated beyond the intermediate stop position and above their height. do. Note that the hydraulic cylinders 21.21 have their extension limits, that is, the molds DI, D
It is preferable to drive at low speed from the forward limit of No. 2 to the intermediate stop position, and to drive at high speed from the intermediate stop position to the backward limit.

The forward limit of the molds D1 and D2 depends on the fixed position of the bridge girder material W and the plate thickness t of the web W1. Now, the center of the lower flange W2 and the center line CL of the guide rails GR, GR
When fixing the bridge girder material W by aligning the D
1 to a predetermined forward limit, the mold D2 is brought into contact with the web W1, and then a predetermined pressing force P is preferably generated.

All control operations, including the horizontal movement of the trolley 10, the raising and lowering of the cylinder unit 20.20, and the expansion and contraction of the hydraulic cylinder 21.21, are performed via one of the operation boxes 15a, 15a. .15 and then use the operation box 15a on the operation step 15, but the operation step 15 is
When the cylinder unit 20.20 rises above a certain height, it goes up and down together with the cylinder unit 20.20, so even if the girder height of the bridge girder material W is high, the worker always
The work can be carried out while observing the state of distortion correction in the web W1 from the vicinity of the molds D1 and D2.

In addition, the crossbeam bracket W5, gusset W6, W6...
For installation positions of particularly tall components, such as (
(see Fig. 4), a heating straightening method using a gas burner, etc. may be used in combination. Generally, molds D1, D2, hydraulic cylinder 21
．． 21, when the distortion correction for the mounting positions of the horizontal stiffeners W3, W3..., vertical stiffeners W4, W4... is completed, there is only a small amount of distortion remaining in the web W1. The amount of heat correction required for the mounting position is approximately 1/2 that of the conventional method. In addition, by changing the shape of the mold D2 or replacing the mold D2 so that it can be applied to these special parts, it is also possible to perform all distortion correction without using heat straightening together. It is possible.

As described in detail, according to the present invention, the hydraulic cylinders Since the welding distortion occurring in the web can be continuously corrected by sequentially pressing arbitrary positions of the web of the bridge girder material through a mold, no special skill is required for the distortion correction work. Moreover, it has an excellent effect of extremely high working efficiency.

[Brief explanation of the drawing]

1 to 3 show an embodiment, in which FIG. 1 is an overall perspective explanatory view, FIG. 2 is a perspective explanatory view of main parts, and FIGS. 3(A) to 3D) are operation explanatory views. FIG. 4 is a perspective explanatory view of the bridge girder material. W...Bridge girder material Wl...Web DI, D2...Mold 10...Dolly 15...Operation step 21...Hydraulic cylinder

Claims (1)

[Scope of Claims] 1) A gate-shaped truck that moves back and forth across bridge girder materials;
A pair of hydraulic cylinders mounted on the trolley and raised and lowered while facing each other horizontally, the hydraulic cylinders are connected to each other through a mold,
A strain straightening device for bridge girder material, characterized in that it presses the web of the bridge girder material by sandwiching it therein. 2) The bridge girder material strain correction device according to claim 1, wherein the truck includes an operation step that moves up and down together with the hydraulic cylinder when the hydraulic cylinder rises above a certain height. 3) The bridge girder material strain correction device according to claim 1 or 2, wherein the hydraulic cylinder has an intermediate stop position.