JPS6128805Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a structure in which a beam for supporting piping, etc. is welded to a foundation plate buried in the concrete wall of a building, etc. at a predetermined gap. In particular, the present invention relates to a beam structure capable of improving the strength and rigidity of the beam itself as well as the strength of the welded joint. In cases where many piping support devices are installed on the concrete wall of a building, such as in the piping system of a nuclear power plant, the support devices are not directly installed on the foundation plate buried in the concrete wall, but rather the support devices are attached to each other between the foundation plates. A common method is to provide a beam in between and attach the support device via this beam. Specifically, as shown in Fig. 1, this stub beam structure has stub beams 3 made of channel steel or H-shaped steel between foundation plates 2 buried in a wall 1 with a predetermined gap between them.
It is constructed by spanning and fixing by welding.

An operating frame or piping 4 for various devices is attached to and fixed to this beam 3 by a support device 5.

By the way, when the beam 3 is made of channel steel, the moment of inertia and the section modulus differ depending on the axial direction, as shown in Fig. 2, and there are so-called strong and weak axes. If force is applied in the direction of the weak axis from piping etc. installed on the
Since it does not have sufficient strength and rigidity in that direction, it has the disadvantage that the range of structures that can be attached to it is considerably limited.

In addition, when welding and fixing the main beam 3a and the branch beam 3b formed to be branched to this on the foundation plate 2 as shown in FIG. 3, the joint end of the branch beam 3b In this case, there was a part A that could not be joined by welding, and there was a problem that a sufficiently strong connection could not be achieved.

Furthermore, when the foundation plate 2 is formed by recessing inward from the wall surface 1 as shown in FIG. Since the auxiliary member 6 had to be fixed by welding, it was very difficult to adjust the thickness of the auxiliary member 6.

On the other hand, when using H-shaped steel as the dump beam 3c, the flanges 7, 7 of the H-shaped steel are used as shown in Fig. 5.
The waste 8 has the inconvenience of collecting water, etc., and is not suitable for use in fields such as nuclear power plants, where efficiency of decontamination is important in dealing with radioactive contamination.

This invention was devised to effectively solve the above-mentioned problems, and its purpose is to improve the strength and rigidity of the beams by using steel pipes for the beams themselves. It is an object of the present invention to provide a stub beam structure capable of improving the strength of the welded joint as well as improving the strength of the welded joint.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

First, as shown in FIGS. 6 and 7, reference numeral 2 denotes foundation plates buried in a wall 1 of a building or the like with a predetermined gap between them. The main sill 9 is spanned in a straight line, and the lower end of the main sill 9 on the mounting side is welded and fixed to the mounting surface 2a of the base plate 2.

A branch beam 11 made of a square steel pipe having the same shape as the main beam 9 is joined to the side portion 10 of the main beam 9 so as to branch in a direction perpendicular to the side portion 10. It is welded and fixed to a base plate (not shown).

Specifically, the joint end surface 12 of this branch beam 11
has notches 13, 13 cut out in advance on the opposite side (above) of the wall surface 1, and this notch 1.
3 and 13 are sealed, and the above-mentioned main sill beam 9 and branch sill beam 11 are sealed.
A cutout piece 14 for welding and joining the two is formed. When installing this branch sill 11, first weld the outer edge of the joint end of the branch sill 11 to the side 10 of the main sill 9 and the mounting surface 2a of the foundation plate 2, and then A welding torch or the like is inserted into the square steel pipe through the notches 13, 13, and the inner edge 15 of this joint and the side part 10 of the main stub beam 9 are
are welded and fixed, and then these notches 13, 1
3 is also covered with the cut pieces 14, 14, and the main stub beam 9 and the branch stub beam 11 can be fixed by welding. Then, a support device for piping or an operation stand for various devices is attached and fixed to the stub beams 9 and 11 stretched in this manner in all directions.

In addition, as shown in FIG. 8, only the main beam 9 may be welded and fixed on the base plate 2, and the branch beams may not be attached thereto. In this case, a support device for piping or a stand 16 for operating various devices is directly attached to the main beam 9.

Next, a modified embodiment of the present invention will be described.

First, it is necessary to install the beam body with a predetermined gap from the wall surface 1, and if the base plate 2 is sunk into the wall surface 1 in a concave shape and the mounting surface 2a is buried at an angle, Attachment is carried out as shown in Figures 9 to 10. That is, the main beam 9a made of a square steel pipe with a square cross section is cut to a predetermined length, and one end of the connecting part 17 is cut diagonally to make it stand upright on the base plate 2. Mounting surface 2 of part 17 and base plate 2
Weld and fix a. It is preferable that a lid 18 or the like be provided at the other open end of the main beam 9a to keep it in a sealed state to prevent dust from entering therein.

On each side 10a of the main stub 9a made of a square steel pipe, there are branch sills 11a made of a square steel pipe with a square cross section similar to those in the above embodiment, extending in all directions from the main stub 9a at a predetermined distance from the wall surface 1. They are joined with a gap in between, and this extending end is welded and fixed to a base plate (not shown).

The joint end surface 12a of this branch beam 11a has a notch 13a cut out in advance on the opposite side (above) of the wall surface 1 in the same manner as in the above embodiment, and a notch 13a that is sealed and installed vertically. main beam 9a
A cutout piece 14a for welding and joining the branch beam 11a is formed. When installing this branching beam 11a, first
1a is separated from the wall surface 1 by a predetermined gap, the outer edge of the joint end of this is welded to the side part 10a of the main beam 9a, and a welding torch or the like is inserted into the square steel pipe through the open notch 13a. The inner edge 15a of the joint end and the side part 10a of the main stub 9a are then welded and fixed, and then these notches 13a are covered with the cutout piece 14a, and the main stub 9a and the branch sill are connected to each other. The beam 11a can be fixed by welding.

Then, a piping support device and the like are attached and fixed to the branch beam 11a that has been welded and fixed in this manner.

In this case, if the length of the main beam 9a is adjusted to eliminate the level difference between the upper end of the main beam 9a and the branch beam 11a, the upper end of the main beam 9a can also be equipped with a support device for piping, etc. Installation is now possible.

In this way, in the beam structure according to the present invention, since a square steel pipe with a square cross section is used as the beam, the moment of inertia and the section modulus are the same for both axes, and the piping system or No matter what direction the load is applied from the operation stand,
It can have sufficient strength and rigidity to withstand this.

In addition, when welding the side parts 10, 10a of the main beams 9, 9a and the joining end surfaces 12, 12a of the branch beams 11, 11a, the notches 13, 13a formed in the branch beams 11, 11a are A welding torch or the like is inserted to weld and join the inner edges 15, 15a of this joint end to the side parts 10, 10a of the main stub beams 9, 9a, and then the notches 13, 13a are cut out to form pieces 14, 1.
4a and welded and bonded, the strength of this bond can be increased.

Furthermore, even if the foundation plate 2 is recessed from the wall surface 1 and its mounting surface 2a is installed at an angle, the main beam 9a with a square cross section as shown in FIG. Since the branch beams 11a are welded to the side portions 10a of the main beams 9a in the same manner as described above, these welds can be easily performed.

Furthermore, it goes without saying that this beam structure is not limited to the nuclear field, but can also be used in other fields.

In short, according to the present invention, the following excellent effects can be achieved.

(1) Since square steel pipes are used as the beams, there is no distinction between weak and strong axes, and the strength and rigidity can be reliably improved in any loading direction.

(2) The welding strength of the joints between the pile beams and between the pile beams and the foundation plate can be improved as much as possible.

(3) Even if the foundation plate is recessed into the wall surface and the mounting surface is inclined, the sill beam can be easily adjusted and installed.

(4) Since no garbage or water accumulates, it can also be used in fields where decontamination efficiency is important, such as nuclear power plants.

(5) It has a simple structure and can be easily adopted.

[Brief explanation of drawings]

Figure 1 is a plan view showing the state in which piping, etc. are attached to a beam structure installed on the wall of a building, etc., Figure 2 is a cross-sectional view when channel steel is used as the beam, and Figure 3
The figure is a sectional view taken along the line arrow in Fig. 1, Fig. 4 is a sectional view showing the installed state of the stub beam in a state where the foundation plate is buried in a concave shape on the wall surface, and Fig. 5 is an H-shaped sill beam. 6 is an enlarged plan view of the main part showing a preferred embodiment of the present invention, FIG. 7 is a sectional view of the stairs taken along the line in FIG. A cross-sectional view showing a state composed of only beams,
FIG. 9 is an enlarged plan view of a main part showing a modified embodiment of the present invention, and FIG. 10 is a cross-sectional view of a staircase taken along the line X--X in FIG. In addition, in the figure, 1 is the wall surface, 2 is the foundation plate, and 2a
is the mounting surface, 9, 9a are the main beams, 11, 11a are the branch beams, 12, 12a are the joint end surfaces, 13, 13a
is a notch, and 14 and 14a are cutout pieces.

Claims (1)

[Scope of utility model registration request] In a beam structure in which a foundation plate is buried along the wall surface of a building, etc. and supports piping, etc. with a predetermined gap between the plates, it is attached to the mounting surface of the foundation plate by welding. A main beam made of steel pipe, a branch beam made of steel pipe that is joined to the main beam by welding and has a notch so that the joint end face is cut upward, and a branch beam made of steel pipe with the notch sealed and the main beam connected to the main beam by welding. and a cutout piece for joining the branch beam and the branch beam.