JPH08309511A - Formation of diaphragm of hollow cross sectional structure - Google Patents

Abstract

PURPOSE: To easily form an integral type diaphragm by forming a mold in the inner part of an outside member, assembling the outside members to form a hollow cross sectional structure and pouring molten steel into a cavity in the mold from the outer part. CONSTITUTION: The upper outside member 10 and the outside member 11 are put together and a V-shaped bevel butt-welding is applied to the bevels 13 to form a hollow cross sectional structure 20. This hollow cross sectional structure 20 has the same shape as a square pipe and a sprue 1a and a gas vent hole 1b are provided at the upper part, and a sand mold 8 and a core 9 are formed in the inner part. The molten steel 23 is poured into the cavity from a ladle 23 by setting a guide 21 to the sprue 1a. When the molten steel 23 sufficiently solidifies, the core 9 is broken out with a hitting rod, etc., from the outer part and the sand mold is scraped out from the developed opening hole. By this method, since the joining part between the outside member and the diaphragm, that is, an inspection part is positioned near the outer surface, a non-destructive test can easily be applied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for forming a diaphragm on a hollow cross-section structure such as a square pipe or a round pipe.

[0002]

2. Description of the Related Art FIG. 11 is a perspective view of a square pipe provided with a diaphragm. In the construction field, the diaphragm means a reinforcing partition wall or a reinforcing partition plate to be put in a steel material.
A structure in which the diaphragms 101, 101 are appropriately placed inside 0 is necessary to satisfy the strength requirement. However, since the square pipe 100 has a hollow cross-section structure, the diaphragms 101, 101 cannot be easily attached.

Therefore, for example, Japanese Patent Laid-Open No. 61-12235.
No. 9 publication, "Method for manufacturing square steel tube column having integrated horizontal diaphragm" and JP-A No. 4-300080, "Method for forming inner diaphragm of square steel tube member" have been proposed. The above will be described with reference to FIG. 12 and the above with reference to FIG.

12 (a) to 12 (c) are explanatory views of a conventional diaphragm joining method by resistance welding. In (a),
Two pieces of channel steel 112, in which the diaphragm 111 is welded in advance, are prepared, and these are piled up to form a square pipe. In (b), the electrodes 113 and 113 are pressed against the outer surface to flow a high current, and the diaphragms 111 and 111 are resistant to each other. By welding
The structure (c) is obtained.

FIG. 13 is an explanatory view of a conventional diaphragm joining method by electroslag welding. Backing materials 115, 115 are attached to one diaphragm 111 in advance, and holes for passing electrodes for electroslag welding ( It is characterized in that the notches 116, 116) are opened, two channel steels having the diaphragms 111, 111 pre-welded are prepared, and these are stacked to form a square pipe, and the welding is performed from the notches 116, 116. By inserting the rod 117, the diaphragms 111, 111 are joined together by electroslag welding, then the channel steels are welded together, and the holes are also filled by this welding.

[0006]

In the above, the resistance welding requires a high technique because of the large resistance welding area. That is, it is necessary that the surface to be welded is pressed uniformly. Further, since the distance from the outer surface to the welded portion is large, it is difficult to carry out a nondestructive inspection to confirm the quality of welding.
Further, since the amount of welding is large and the welding heat is large in the above, the steel material is likely to be thermally deformed and distorted, and the manufacturing cost is increased. Therefore, an object of the present invention is to provide a technique that replaces the conventional method of joining diaphragms having a half width by welding.

[0007]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention uses a channel steel, a half steel pipe or the like as an outer member, and forms a mold inside the outer member, and then the outer member. A hollow cross-section structure is formed by combining members or covering the outer member with a lid, and molten steel is injected into the mold cavity from the outside through a spout opened in the outer member to form a diaphragm in the hollow cross-section structure. To form.

The mold is a sand mold, and a core is combined with the sand mold to break the core after solidification of molten steel to form an opening,
The sand mold is scraped out of the hollow cross-section structure through this opening.

Alternatively, a mold is formed inside a hollow cross-section structure such as a steel pipe, and molten steel is injected into the mold cavity from the outside through a sprue opened in the hollow cross-section structure to form a diaphragm.

[0010]

Embodiments of the method of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. 1 (a) to 1 (c) are explanatory views (previous stage) of a method for forming a mold according to the present invention. In (a), the wooden mold 2 is set inside the outer member 1 such as channel steel. This wooden pattern 2
Is a mold whose main parts are tooth portions 3 and 3 having the same thickness as the diaphragm and convex portions 4 having the same shape as the core, and which can be easily handled by the handles 5 and 5. 1a and 1a are spouts opened in the outer member 1. Is.

In (b), the space between the wooden mold 2 and the outer member 1 is filled with the casting sand 6 and tamped appropriately. (C)
In, the cavities 7, 7 are removed by removing the wooden mold 2.
A sand mold 8 containing is formed. In this sand mold 8, core 9
Should be set. The core 9 is also made of hardened casting sand, and is a half cylinder in this example. It is essential that the cavities 7, 7 face the sprues 1a, 1a.

FIG. 2 is an exploded perspective view of the outer member according to the present invention. The upper outer member 10 is the outer member 1 turned upside down, and has sprues 1a, 1a and a gas vent hole to be described later on its upper surface. It is provided with a sand mold 8 and a core 9 inside. The lower outer member 11 is from the outer member 1 to the sprue 1
It is the same as that excluding a and 1a, and corresponds to the one having the sand mold 8 and the core 9 inside. In addition, 13 is a groove.

FIGS. 3 (a) and 3 (b) are explanatory views (post-stage) of the method for forming a mold according to the present invention. In (a), the upper outer member 10 and the lower outer member 11 are overlapped to form a groove 13,
V-shaped groove butt welding is applied to the portion formed in 13 to complete the hollow cross-section structure 20. This hollow cross-section structure 20 has the same shape as a square pipe, and has a sprue 1a and a gas vent 1 at the top.
b, and a sand mold 8 and a core 9 are provided inside.
In (b), the guide 21 is set on the sprue 1 a, and the molten steel 23 is poured into the cavity 7 from the pot 22 via the guide 21. At this time, the gas vent hole 1b acts as a gas vent and a riser. That is, it can be confirmed that the cavity 7 is sufficiently filled with the molten steel 23 by overflowing a part of the molten steel 23 from the gas vent hole 1b.
When the molten steel 23 is sufficiently solidified, the core 9 may be punched from the outside with a projecting rod or the like, and the sand mold may be scraped out from the opening that has appeared.

The molten steel 23 is composed of a carbon steel component with necessary additives added, and the temperature of the molten steel is set to the temperature of the molten steel which is usually carried out or higher. Furthermore, it is preferable that at least the vicinity of the mold of the hollow cross-section structure 20 is sufficiently warmed when the molten steel 23 is poured. It is also desirable to increase the injection rate.

FIG. 4 is a perspective view of a hollow cross-section structure (first embodiment) provided with a diaphragm manufactured by the method of the present invention. Two diaphragms 25 are provided inside a square pipe-shaped hollow cross-section structure 20. It is shown that 25 can be integrally formed. 26 is an opening used to scrape out the sand mold,
This opening 26 has little effect on the strength and is therefore left open. The diaphragm 2 has a shape in which a part of the diaphragm 25 is engaged with the gate 1a and the gas vent hole 1b.
5 more reliably engages the upper outer member 10, which is advantageous in strength. However, when the solidified metal rises from the sprue 1a or the gas vent hole 1b, it is ground by a grinder or the like to make it smooth.

Although other embodiments will be described below, the same elements as those in the first embodiment will be designated by the same reference numerals and detailed description thereof will be omitted. 5A and 5B are perspective views of a hollow cross-section structure (second embodiment) according to the present invention, and FIG.
(B) is a completed drawing. In (a), the lower outer member 11 is formed in a deep groove shape, and the lower outer member 11 is formed.
Sand mold 8 is formed on the bottom, and then the sprue 1a and the gas vent hole 1b are formed.
The lid 27 having the above is covered, and the lid 27 is welded to the lower outer member 11. After that, molten steel is injected into the cavities 7 and 7 according to the procedure of FIG.
A hollow cross-section structure 30 including the diaphragms 25, 25 shown in (b) is obtained.

6 (a) and 6 (b) are perspective views of a hollow cross-section structure according to the present invention (third embodiment), FIG. 6 (a) is an exploded view and FIG. 6 (b) is a completed view. In (a), a sand mold 8 is formed on each of the half pipe-shaped upper outer member 10 and lower outer member 11, and the outer members 10 and 11 are overlapped and welded to each other. Then, molten steel is injected into the cavities 7 and 7 according to the procedure of FIG. 3B, and the sand molds 8 and 8 are scraped out to form the hollow cross-section structure 32 including the diaphragms 25 and 25 shown in FIG. 6B. obtain.

FIG. 7 shows a hollow sectional structure (fourth embodiment) according to the present invention.
(Embodiment) is a perspective view showing a method of filling casting sand over the entire length of the outer members 10, 11 to form cavities 7, 7, and injecting molten steel into these cavities 7, 7. The cavities 7 and 7 are economical because they can be easily formed from wood board pieces or steel plate pieces, and are suitable when the strength of the sand mold 8 is small.

FIG. 8 shows a hollow cross-section structure (No. 5) according to the present invention.
(Embodiment) is a perspective view, characterized in that the mold is a steel plate 28 ... (... indicates a plurality. The same applies hereinafter), after joining the upper outer member 10 and the lower outer member 11 , Molten steel is injected into the cavities 7, 7 between the steel plates 28. No need for wood molds or cores, and no need for scraping sand molds. The steel plates 28 ... Remain inside the hollow cross-section structure 34, but since they do not cause any actual damage, they are left as they are.

FIG. 9 shows a hollow cross-section structure (6th embodiment) according to the present invention.
(Embodiment) is a perspective view, the outer member 1 is a square pipe,
Steel plates 28 are sequentially locked near the openings of both ends of the outer member 1, and molten steel is injected into the cavity 7 between the steel plates 28, 28. It is economical because a commercially available square pipe can be used. No need for wood molds or cores, and no need for scraping sand molds. The steel plates 28 ... Remain inside the hollow cross-section structure 36, but since they do not cause any actual damage, they are left as they are. The outer member 1
May be a round pipe.

FIG. 10 is a view showing an application example of the hollow cross-section structure manufactured by the method of the present invention. Another member, for example, H-section steel 38, 3 is added to the hollow cross-section structure 20 manufactured by the method of the present invention.
In this example, 8 is welded to form a cross. According to the method of the present invention, it is easily possible to construct the diaphragms 25, 25 sufficiently thick. Therefore, the flange 38 of the H-shaped steel 38 is attached to the thick diaphragms 25, 25.
It is preferable that the a and 38a are faced to each other and the joints are increased in rigidity. In the hollow cross-section structure 20 of the present invention, the traces of the sprues 1a, 1a can be visually observed from the outside, so that the H-section steels 38, 38 can be attached at the correct positions by using these marks as marks.

[0022]

The present invention has the following effects due to the above configuration. According to a first aspect of the present invention, a grooved steel, a half steel pipe or the like is used as an outer member, a mold is formed inside the outer member, and then the outer members are combined with each other or the outer member is covered with a hollow sectional structure. Since the molten steel is injected into the mold cavity from the outside through the sprue opened in the outer member to form the diaphragm in the hollow cross-section structure, the diaphragm is formed in the hollow cross-section structure. In this way, it is possible to easily form the integral diaphragm that is in close contact with the inner surface of the outer member. Non-destructive inspection was difficult because the inspection part of the conventional half-diaphragm that was resistance welded or electroslag welded was at the center farthest from the outer surface,
In the present invention, since the inspection portion is located at the joint between the outer member and the diaphragm, that is, near the outer surface, nondestructive inspection can be easily performed.

According to a second aspect of the present invention, the mold is a sand mold, a core is combined with the sand mold, the core is broken after molten steel solidification to form an opening, and the sand mold is opened through the opening to the outside of the hollow cross-section structure. Since it is scraped out, there is no concern that the mold will remain in the hollow cross-section structure.

According to a third aspect of the present invention, a mold is formed inside a hollow cross-section structure such as a steel pipe, and molten steel is injected into the mold cavity from the outside through a sprue opened in the hollow cross-section structure to form a diaphragm. Since the diaphragm is formed in the hollow cross-section structure by this, the cost of the hollow cross-section structure can be easily reduced, and the integral diaphragm in close contact with the inner surface of the outer member can be easily formed. Non-destructive inspection of the conventional half-diaphragm resistance-welded or electroslag-welded is difficult because the inspection part is at the center farthest from the outer surface, but in the present invention, the inspection part joins the outer member and the diaphragm. The non-destructive inspection can be easily carried out because it is near a part, that is, the outer surface.

[Brief description of drawings]

FIG. 1 is an explanatory view (former stage) of a mold forming method according to the present invention.

FIG. 2 is an exploded perspective view of an outer member according to the present invention.

FIG. 3 is an explanatory view of a method for forming a mold according to the present invention (late stage)

FIG. 4 is a perspective view of a hollow cross-section structure (first embodiment) including a diaphragm manufactured by the method of the present invention.

5A and 5B are perspective views of a hollow cross-section structure according to the present invention (second embodiment), in which (a) is an exploded view and (b) is a completed view.

6A and 6B are perspective views of a hollow cross-section structure according to the present invention (third embodiment), in which (a) is an exploded view and (b) is a completed view.

FIG. 7 is a perspective view of a hollow cross-section structure (fourth embodiment) according to the present invention.

FIG. 8 is a perspective view of a hollow cross-section structure (fifth embodiment) according to the present invention.

FIG. 9 is a perspective view of a hollow cross-section structure (sixth embodiment) according to the present invention.

FIG. 10 is a diagram showing an application example of a hollow cross-section structure manufactured by the method of the present invention.

FIG. 11 is a perspective view of a square pipe provided with a diaphragm.

FIG. 12 is an explanatory view of a conventional diaphragm welding method by resistance welding.

FIG. 13 is an explanatory diagram of a conventional diaphragm joining method by electroslag welding.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Outer member, 1a ... Gate, 2 ... Wooden mold, 7 ... Cavity, 8 ... Sand mold, 9 ... Core, 10 ... Upper outer member, 11
... lower outer member, 20, 30, 32, 34, 36 ... hollow cross-section structure, 25 ... diaphragm, 27 ... lid, 28 ... steel plate as steel mold.

Claims (3)

[Claims] 1. A hollow cross-section structure in which a channel steel, a half-divided steel pipe or the like is used as an outer member, a mold is formed inside the outer member, and then the outer members are combined with each other or the outer member is covered with a lid. A method for forming a diaphragm of a hollow cross-section structure, comprising forming an object and injecting molten steel into the cavity in the mold from the outside through a spout opened in the outer member to form a diaphragm in the hollow cross-section structure. 2. The mold is a sand mold, a core is combined with the sand mold, the core is broken after molten steel solidification to form an opening, and the sand mold is exposed to the outside of the hollow cross-section structure through the opening. The method for forming a diaphragm of a hollow cross-section structure according to claim 1, wherein the diaphragm is scratched out. 3. A diaphragm is formed by forming a mold inside a hollow cross-section structure such as a steel pipe, and injecting molten steel into the cavity in the mold from the outside through a sprue opened in the hollow cross-section structure. For forming a diaphragm of a hollow cross-section structure.