JPS589778A - Manufacture of conical structure made of steel plate - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a conical structure made of steel plate.

゛ When manufacturing a hollow circular structure such as the roof of a hopper or silo, conventionally it was generally done in a fan shape as shown in Figure 1.
A large number of raw boards 30 are made into planks, and then each of these blank boards 30 is pressed to a predetermined curvature, and the pasted wood boards 30' are temporarily assembled into a conical shape on site. The method used was to bathe each piece one by one.

However, this method uses a large number of fan-shaped blank plates 30 that are finely divided, resulting in a poor material yield, and requires a press forming process, which increases processing costs. Since the wire length is long, the welding wire length is long, and the on-site forming (temporary assembly, welding) takes a lot of time and man-hours. Therefore, there are disadvantages that the overall manufacturing time is longer and the manufacturing cost is higher.Furthermore, this method has poor joint efficiency because the posture and footing during welding are not good, and the resulting weld line part of the wooden conical structure There were some problems, such as the fact that the electrical equipment was easily damaged.

The present invention was devised after repeated research in view of the above-mentioned circumstances, and its purpose is to manufacture a hollow conical structure made of steel plate at a high material yield, in a short period of time, and at low cost. The object of the present invention is to provide this ridge-conical structure/O manufacturing method that can improve joint efficiency.

In order to achieve this objective, the present invention changed the idea of the conventional technique of forming a large number of small pieces into a curved shape and joining them one by one to form a cone, and instead created a shape that is an expanded cone while leaving a flat plate. The material is joined together and then directly formed into a three-dimensional conical shape using the deflection deformation caused by the material's own weight.In other words, the flat plates that make up each part of the cone are flattened and welded, and the welded material is formed into a three-dimensional conical shape. It is characterized by lifting the outer circumferential portion of the element body to form it into a conical shape by bending due to its own weight, and then bringing both ends together and welding the seam.

The present invention will be explained below based on the accompanying drawings.

Figures 3 to 10 show an embodiment of the method for manufacturing a steel plate m-structure according to the present invention.First, as shown in Figure 5g3, each of the cones is The flat plates 1, 2, 3, and 4.5 constituting the part are cut and beveled, and the flat plates 1.2, 3, and 4.5 are brought into contact with each other to create an expanded element body 6 in the form of an expanded cone. .

To explain this process in detail, the present invention does not require cutting a group of sector-shaped small pieces whose circumference is equally divided or press-working them, as in the conventional method.・As shown in Figure 3, it is sufficient to divide the expanded cone into several pieces parallel to each other based on the extension line of one edge of the cone to create round, so-called large-sized flat plates 1, 2, 3, and 4.5. In other words, for example, two long steel plates a,
Using a long steel plate a and a shorter steel plate C as materials, cut the ends of each long side of a long steel plate a and a short steel plate C to obtain a central flat plate 1.2, and the remaining 1. All you have to do is cut out the flat plates 3 and 4.5 on both sides using a long steel plate C.
The flat plate 1 to be machined with a beveling on one side along the adjacent line of each of these flat plates 1, 2.3° 4.5, and to form seams T and 8.
, 3.4, it is sufficient to form a bevel on one side at the edge.

Next, each flat plate 1.2 obtained in the previous step.・3
．． 4.5 was carried out at the site for Km, and here it was developed into a flat surface, and the flat plates 1, 2, and 3 degrees 4.5 were welded together on a surface plate to form the above-mentioned developed element 6. 9 is a welding line, and since this welding line is a straight line, and the base metal is placed horizontally and welding is performed in a downward position, efficiency can be appropriately improved by introducing an automatic welding machine. In this step, a plurality of lifting members 10 are attached to the outer periphery of the deployable body 6 at equal intervals.

Next, a crane (not shown) is guided above the unfolded element body 6 obtained in the previous step, and the lifting member 1 is lifted as shown in FIG. 4A.
Pass the hanging rope 11 through the crane 0, lock it with the hook 12 of the crane, operate the crane, and begin to lift the deployable body 6 with its outer circumference upward. The developed element body 6 has a plurality of flat plates 1, 2, 3, . '4. It is a large area inheriting the S, and has a considerable weight.

Therefore, as shown in Figure 4 A, B, and C, by hoisting the outer periphery with a crane, the whole body flexes due to the chalk, naturally forming a funnel shape, pear shape, and at the same time, abort (both ends). ', 8
Start rounding so that they gradually approach each other = From then on, by increasing the amount of lifting, the unfolded element body 6 gradually becomes three-dimensional and is formed into a conical shape, and finally, as shown in Fig. 4 DK, the joint is 1.8. The outer peripheral sides of the two are brought together, and the center of the seam 7.8 is left slightly open.

The seams 1.8 in this state are brought into contact with each other and welded together to form a predetermined conical structure 13 as shown in FIG. 10. 14 is a self-welding line.

When aligning the skins, if necessary, the center side of the seam may be pulled together using a lever block or the like.

Note that, for example, it is also possible to lift the center part side during lifting, but in this case, the center SW of the seam will become loose and the outer peripheral part side will be in a slightly open state. - It is difficult to pull the opening on the outer circumference side, and even if you pull it all the way, the seam will be at an acute angle, which is dangerous if the curve is smooth. Therefore, lifting on the outer peripheral side as in the method of the present invention is advantageous.

An important point in the above-described molding process is the finishing of the closely spaced seams 1 and 8. As this technique, the method shown in FIGS. 5 to 9 is adopted in this embodiment. In other words, the element body 6 is deployed by a crane as shown in 6.
When it has been properly lifted up with the outer circumferential portion upward, the lifting is temporarily interrupted, and in this state, an appropriate number of spacers 15 are attached along one of the girths 7 as shown in FIG.

The spacer 15 has a hole 16 passing through the plate thickness, and
A longitudinal center portion of a stopper 17 for skin alignment is formed on the inner bottom of the hole 16. Then, such a spacer 15 is
The half part ITa of the stopper 17 is applied to the seam 1 so as to be located along the lower surface of the unfolded element body 6, and the half part ITa is brought into contact with the seam 1 at a position below the groove.

After the installation of the spacer 15 is completed in this manner, the crane is operated again to lift the unfolding main body 6. Then, as the molding progresses and the seams 7.8 almost touch each other, the seam 8 on the side where the spacer 15 is not attached is placed on the remaining half 17b of each stopper 1T, and the second As shown in Figure 6, by using an appropriate tightening device 18 such as a manual winch or a turnbuckle, bring both seams 1.8 close to each other without causing any displacement in the longitudinal direction, and bring the joint tips into close contact with each other by sandwiching the spacer 15. .

While maintaining this state, a wedge 19 made of a tapered rod or a tapered or sloped sheet pile is driven into the hole 16 of each spacer 15 as shown in FIGS. The seam 8, which is slightly floating on the stopper due to the side surface, is pressed flat so that it is level with the other seam 7.

This completes the skin alignment of the seams 7.8, and as shown in Figure 9, the upper and lower ends and the seams between each spacer 15.15 are tack welded with 1dA20, and when the shape is 9, weld the wedges 19. and the spacer 15 are removed, and the final welding is performed along the grooves of the seams 7 and 8.

Next, specific examples of the present invention are shown below.

Example (1) According to the present invention, the area is 32.75 m'' and the weight is 1.15 m.
A 7# conical hopper for soybean sorting equipment was manufactured. During production, the length of the straight section from the steel plate was 7318 m and 6 m, respectively.
1 plate each of 710m5, 2860m5 and 2220m
- Cut out the two plates and weld them flat as shown in Figure 3 to make an open conical element with a deployment angle of 254.56' and a half-1 I3844 angle. It was lifted up and formed into a conical shape in the steps shown in Figures 4 to 110, and the seams were welded.

U) In order to examine the effects of the present invention, a hopper with the same weight and area as above was manufactured using a conventional method. As shown in Figure 1, the base plate is <127.28'xl! I 51! X 2'J
dL, 42.426Qx1300m 86 sheets, 42.
426' was made of 6 pieces of 1244mm, which were bent by press working and then welded to form a conical shape as shown in Fig. 2 of each curved blank plate.

(2) The results of the method of the present invention and the conventional method are compared and shown in Table 1 below.

Table 1 As is clear from Table 1, according to the present invention, the material yield can be improved by about 23 mm compared to the conventional method, and the cutting and groove line length of the material can be improved by about 30 mm, and the weld line length can be reduced by about 45 mm. It can be seen that the fields can be reduced by 1.5% and the man-hours can be greatly reduced.

According to the book *1jliK explained above, when K is a flat plate that makes up each part of a cone, it is expanded into a plane and welded, and by lifting the area near the outer periphery of the resulting expanded element, it bends due to its own weight and becomes a conical shape. By forming the material and welding it by aligning the seams, we are able to improve the material yield and
The cutting of the material and the bevel line length are shortened, making it possible to shorten the welding line length (than K).Furthermore, since press working can be omitted, processing costs can be significantly reduced, and K can be made into an expanded cone from a flat plate. Because the object is lifted up and directly formed into a conical shape, the number of forming steps and forming time on site can be reduced.Also, the outer periphery is lifted up.

It is easy to butt the seams, and the finished product after melting has an inverted conical shape, so when creating hoppers, etc., it is only necessary to attach the inverted conical shape to a predetermined position Km, which requires further work. can be shortened.

Furthermore, according to the present invention, most of the welding involves
It is performed in a downward position in the IM state, and it is sufficient to weld the joints at both ends at the site, which improves joint efficiency and provides a conical structure of high quality.

[Brief explanation of drawings]

Figures 1 and 2 show the conventional conical structure manufacturing method.
Figure a11 is a half-way view showing the board cutting process, Figure 2 is a perspective view showing the forming process, and Figures 3 to 10 are step-by-step diagrams showing the conical structure manufacturing method according to the present invention. Figure 4 is a plan view showing the state at the time of board cutting and development of the expanded element body, Figure 5
The figure is a front view showing the state in the middle of the forming process, Figures 6 to 8 are perspective views showing the condition of skin alignment at the end of the forming process, Figure 9 is a perspective view showing the tack welding process, and Figure 10 is a perspective view showing the welding process. FIG. 3 is a perspective view of the completed conical structure. 1.2.3.4.5... Flat plate, 6... Deployment cable body, 1
．． 8... Seam, 10... Lifting member, 13.
...Cone structure, 15...Spacer, 19...Cut. Figure 7 Figure 8 Figure 9 Figure 10 Procedural amendment (issued by ρ) Date: August 13, 1938 Commissioner of the Patent Office Shima ■1 Mr. Haruki (Mr. Patent Office Examiner) 1 Display of the case 1939 Patent Application No. 1θ7==3/2g, 6th beat of Ming: 3 Relationship with the case of the person making the amendment Applicant (412) Nippon Kokan Co., Ltd. 4 Agent 5, the order for the amendment was issued in the Showa era Correct Content 1 Serious condition Page 3, line 11, line 18 from the end of the description, page 11
Multiply by K and replace the phrase “perform beveling processing” with “l or V.”
Form a groove and correct it as %j. Yu Doshoman, page 4, line 9, ``Hagane 1 [a'' says ``r steel plate b''''
I am corrected. 3 From the end of line 11 on page 4 of the same book to the top of line 12, “
Correct "Steel Plate C" to r#[aJ. At the end of the 14th line on page 114 of the same book by Lou, it says, ``Processing the groove on one side.''
The statement is corrected to "form a rIt or V groove." At the end of page 4, line 15 of the same book, ``Hiraita 1e 3 aJ'' is corrected to ``Rhei 1 [1 ref. Correct "rv groove"・'zl'! I] 1@Page 10 In Table 1, the word "none" in the column of bevel length conventional method was corrected to r6.644jllJ,
In the column for groove length and method of the present invention, the text ``RSS, MSA gift'' should be corrected to rysssmJ. g Same book @ page 10, r301g, J at the beginning of the last line is r8
os,” he corrected.

Claims (1)

[Claims] The flat plates that make up each part of the cone are unfolded into a flat surface and connected silently.
A method for producing a conical structure made of a steel plate, in which the outer circumference of the obtained expanded element is lifted up to form a conical shape by deflection due to chalk, and both ends are joined together and bonded to a bath. .