JPS60187477A - Method for assembling box-shaped sectional member and its auxiliary means - Google Patents

Abstract

PURPOSE:To weld an ejected product which is released of tentative fastening to an exactly assembled member having no deviation with high efficiency by fastening tentatively both ends of a lower flange material welded with partition plates to rotary type auxiliary means for holding and welding respectively the web materials on both sides and the upper flange material which are tentatively fastened. CONSTITUTION:Both ends 4 of a lower flange material 1 welded with a prescribed number of partition plates 9 are tentatively bolted to rotary type auxiliary means 10, 16 for holding. Web materials 2 on both sides are tentatively bolted to the means 10 and are rotated so that the members are welded in an easy position. An upper flange material 3 is likewise bolted to said means and is welded in an easy position. The tentative fastening bolts are removed and the flange part of the means 10 is retreated and is horizontally held by a suitable ejecting base 20, by which said part is ejected. The assembly is made with high efficiency and the bolt holes are positioned exactly without deviation by tentative fastening. The assembly in the post stage is thus made easy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for assembling a box-shaped cross-sectional member consisting of upper and lower flange members and web members on both sides that connect the upper and lower flange members, and a method used to carry out this method. It concerns assistive devices.

[Prior art and its problems]

The upper chord members, lower chord members, cross beams, vertical members, diagonal members of the truss girders that make up the bridge, as well as the column members and beam members of the four steel frames, are assembled into a box-shaped cross-section shape to fit each part. It is well known that it is used as a member. By the way, this kind of member is
It is composed of upper and lower flange materials, web materials on both sides that connect them, and internal partition wall materials, but in any case, an assembly method is used in which the joints of the long structural members of steel plates are integrated by welding. It is desirable to ensure accuracy during assembly and to establish excellent workability, including the application of automatic welding methods, but the reality is that no satisfactory method has yet been provided. be.

[Purpose of the invention]

The present invention has been made with the object of providing an assembly method that makes it possible to easily and accurately assemble and hold component parts and apply automatic welding, and a convenient auxiliary tool for carrying out the method.

[Structure of the invention]

This invention welds the required number of partition plates to the lower flange material,
Place a rectangular holding aid on both ends and secure them both with bolts and nuts. Next, join the ends of the web material on both sides to the sides of the above-mentioned aid and secure them with bolts and nuts. At the same time, each partition plate is welded to the inner surface of both web materials, and then the end of the upper flange material is joined to the top surface of the above-mentioned auxiliary tool, and this is tightened and fixed with bolts and nuts, and then the left and right auxiliary tools are attached. The method is characterized in that the welding rotary jig is set in a welding rotary jig through a welding tool, and after welding the joint edges of each member, the welding rotary jig is removed and the auxiliary tool is removed. The auxiliary tool used for this purpose is to assemble steel plates into a rectangular structure, provide bolt holes on the circumferential surface of one end, and attach fixing pieces to a rotating jig for welding parts to the entire or some surfaces of the rectangular periphery. The rotating jig for welding includes a base having a rotating roll, and a rotating jig placed on the base to rotate the workpiece to be assembled via the above-mentioned auxiliary tool. It is characterized by consisting of a freely supported drum.

〔Example〕

The drawing shows one embodiment of the present invention, and the following description will be made based on this drawing.

That is, FIG. 1 is a perspective view showing a member to be assembled and a holder, and this member is shown as an example for assembling the upper chord or lower chord members constituting a bridge truss girder.
) is the lower flange material, (2) is the web material on both sides, (3) is the upper flange material, and connecting bolt holes (4), (5), and (6) are provided at both ends of each member, Also, web material on both sides (
2) is formed with a connecting protrusion (γ) with the diagonal member, and bolt holes (8) are provided in this portion.

Note that (9) is a partition plate made up of a plurality of sheets.

Reference numeral 10) is an auxiliary tool assembled into a hollow rectangular structure using steel plates, and the details of the structure are shown in FIG. That is, when carrying out this invention, two of the above-mentioned auxiliary tools α0) are prepared on the left and right, and the end curves serving as the inner side of each of them correspond to the bolt holes (4), (5), and (6) of each of the above-mentioned members. A bolt hole α0 is provided, and a fixing piece (b) for a supporting member of a rotary welding jig and a hydraulic jack α3 for extraction, which will be described later, are attached to the entire or some surfaces around the bolt hole. A bolt hole 0→ is provided in the fixing piece (B), and a hanging metal fitting (B) is fixed at a proper position on the upper surface of the holder.

α6) is a welding rotating jig for rotatably supporting the assembled and held member (A) using the above-mentioned auxiliary tool α0) and performing welding. This drum (18a) consists of the installed base (E) and the drum (18a) placed on the rotating roll α force.
) is a supporting member for joining and fixing the fixing piece (b) of the auxiliary tool (to) described above), which are combined and stretched in a grid pattern.

2), the member to be assembled (4) is attached to the above-mentioned rotating welding jig 06.
) and is used for the purpose of preventing deflection of the central part when performing welding.For example, as shown in Figure 5, a V-shaped notch Q0 is formed on the top surface. (on the main body), on the wheels that support it), and on the side slopes near the above-mentioned notch (c).
Hydraulic jacks (c) installed on both sides of the main body
Although not shown, the main body (c) includes hydraulic pump piping, a switch box, and a switch box to operate each of the above-mentioned hydraulic jacks (c) and (c), as well as a switch box for rolling the above-mentioned wheels (c). A transmission mechanism such as a motor and gears is installed. In addition, in Figure 5, move the receiving jig () to a predetermined position, work the hydraulic jack (c) to levitate the main body 0 turret, and then work the hydraulic jack (c) to support the member to be assembled ((roll). When rotating the assembled member (A) by the desired amount from this state, -
Simply retract the hydraulic jack (c) and release the support, and if necessary, retract the hydraulic jack (c) and lower the main body a small amount. Note that the use of the above-mentioned receiving jig) is omitted when assembling relatively short members.

The method of the present invention is carried out using the auxiliary tool α0 and the welding rotating jig 06) described above, as well as receiving jigs as necessary.Next, the steps of the assembly method will be explained. do.

First, the partition plate (9) is vertically fixed to the lower flange material (1) at a predetermined interval by welding, and then, as shown in No. 21i9(a), auxiliary tools are attached to both ends of the lower flange material (1). Place α0, drive the drift pin and align it,
Tighten and secure with bolts and nuts. Next, Figure 2 (b
), the web members (2) on both sides are fully joined, and the drift pin is fixed to the holder α0) with a driving bolt and nut. Here, both side edges of the partition plate (9) are welded to the inner surface of the web material (2), and then, as shown in FIG. Drive it in and fix it to the auxiliary tool α0) using the bolt and nut.

When the temporary assembly is completed using the auxiliary tool (10) as described above, confirm that the plumbstones at both ends are vertical, perform the necessary tack welding, and then as shown in Figure 3. , set in the welding rotating jig 06), and this rotating jig 06
) is rotated as appropriate to determine the position (angle), and self-excited welding is performed at the joining edges and corners of each member.

In this case, use a receiving jig () as necessary. When the fillet welding of the girder is completed in this way, it is removed from the welding rotating jig α6), the fixing bolt with the auxiliary tool α0) is removed, and the hydraulic jack (E) is activated to
) is extracted.

〔Effect of the invention〕

According to the present invention, since the temporary assembly is performed while maintaining the assembled shape of the members to be assembled by connecting the ends of the members to the auxiliary tool, the accuracy is always stable and the assembly is accurate. The use of the tamping aid eliminates the misalignment of joints on site, ensures uniform bolt hole relationships on all four sides, ensures good quality, and facilitates construction work of bridges, etc.; and Since high assembly accuracy is achieved, the rework work that conventionally required a large number of steps is also omitted. Furthermore, the work is temporarily assembled using auxiliary tools, then set to rotate freely using a rotating welding jig, and automatic welding is carried out while the position is determined, making work extremely easy and expected to improve efficiency. can.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a perspective view of a member to be assembled and a holder, Fig. 2 is a perspective view showing the assembly procedure, and Fig. 3 shows the structure of a rotating jig for welding. A perspective view showing a set state of the members to be assembled, FIG. 4 is a perspective view of an auxiliary tool,
FIG. 5 is a front view of the receiving jig. (1) is lower flange material, (2) is both side web material, (3
) is the upper flange material, uO) is the auxiliary tool, and 06) is the rotating jig for welding. Patent applicant Hitachi Zosen Corporation

Claims (2)

[Claims] (1) When assembling the box-shaped cross-section member consisting of the upper and lower flange materials and the web materials on both sides that connect them, first weld the required number of partition plates to the lower flange materials, and attach rectangular holding aids to both ends. Then, the ends of the web material on both sides are joined to the sides of the auxiliary tool, and this is secured with bolts and nuts, and each partition plate is fastened to the web material. Then, the end of the upper flange material is joined to the top surface of the above-mentioned auxiliary tool, which is tightened and fixed with bolts and nuts, and then set in the welding rotating jig via the left and right auxiliary tools. A method for assembling a box-shaped cross-section member, characterized in that after welding the joining edges of each member, the rotating welding jig is removed and the auxiliary tool is removed. (2) An auxiliary tool used in a method for assembling a box-shaped cross-sectional member composed of upper and lower flange members and web members on both sides that connect them, which assembles steel plates into a rectangular structure,
A bolt hole is provided on the circumferential surface of one end, and a fixing piece for a rotating jig for welding parts and a jack for extraction are attached to the entire or several surfaces of the rectangular circumference. Assembly aids.