JPH0314511Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention relates to a building frame used as a framework scaffold or formwork support.

``Problems to be solved by conventional techniques and ideas'' This type of building frame that has been used in the past includes, for example, the gate-type structure shown in FIGS. 4 and 5. This building frame is made of steel pipes, with a pair of vertical members 1 and 1 on the left and right.
The upper ends of the frames are connected by horizontal members 2, and reinforcing members 3 are attached to the inner surfaces of the frames of these vertical members or horizontal members.

In addition to being used as a work scaffold, this building frame is
It is also used as formwork support for floors and beams, with a maximum vertical support capacity of 5 to 6 tons and an allowable support capacity of 2.5 tons.

When using this building material as formwork support, in general buildings, the beam cross section and floor slab thickness are small, so if you assemble it in the same manner as when building work scaffolding, it will be sufficient to handle the overload (reinforced steel, concrete, formwork, etc.). weight).

However, in cases such as nuclear power plant construction, the floor slabs can be as thick as 1 meter, and in order to support this with the building frame, it cannot be supported by the usual arrangement of work scaffolding, so double or triple assembling is required. There must be. In other words,
As shown in Figure 6, the usual work scaffolding arrangement a...
In addition to..., other similar arrays b..., c... must be incorporated.

For this reason, in nuclear power plant construction, framework scaffolding made of building frames is used in an array of work scaffolds for column and wall reinforcement and formwork work, and then all of this is dismantled and used again to support the floor. However, the effort required to rearrange it is enormous.
This puts pressure on temporary construction costs.

By the way, even in such cases, if the supporting capacity of the framework scaffolding is large, it is possible to add support for the floor without destroying the arrangement of the framework used for the work scaffolding, and at the same time There is no need for heavy or triple assembly, reducing the need for temporary construction materials, and reducing assembly time and processes.

When considering this supporting capacity, the vertical members of general building frames are steel pipes with an outer diameter of 42.7 mm and a wall thickness of 2.4 mm, and reinforcing materials are attached to the inner surface of the frame, so the direction of this reinforcing material is Although it has considerable strength in the out-of-plane direction, its strength in the out-of-plane direction is low, and the supporting force is determined by buckling in this out-of-plane direction.

Therefore, one possible way to increase the supporting capacity of the vertical members is to change the diameter of the vertical members. For example, from the previous 42.7 mm outer diameter and 2.4 mm wall thickness to 60.5 mm outer diameter and 2.4 mm wall thickness.
If the diameter is 2.3mm, the supporting capacity will be more than double that of the previous model.

However, this has the serious disadvantage that it cannot be mixed with general building frames that are already commercially available and in use.

The present invention takes these matters into account and attempts to improve the conventional building frame to increase its vertical supporting capacity.

"Means for Solving Problems" The present invention is a steel pipe construction frame in which a reinforcing material 3 is attached to one side of the vertical member 1. The long axis direction of the oval shape is perpendicular to the direction in which the reinforcing material 3 is attached.

"Function" With the above configuration, in the vertical member 1, the secondary radius of the cross section in the conventional buckling direction is increased due to its flattening, and the buckling strength is significantly increased.

In addition, since the joint part remains the same as before, it can be used in conjunction with commonly used conventional building frames, and braces, cloth boards, etc. can also be used, and the weight will not increase.

When manufacturing, only the pressing process of the vertical members needs to be added to the conventional manufacturing process.

"Embodiment" FIGS. 1 to 3 show an embodiment of the present invention.

The one shown in the figure is a gate-type building frame made of steel pipes in which the upper ends of a pair of left and right vertical members 1, 1 are connected by horizontal members 2, and reinforcing members 3 are attached to the inner surfaces of the vertical members or horizontal members. The materials 1, 1 are connected to the joint parts 11, 1 at both ends.
The intermediate portions 12, 12 except 1 are flattened to have an oval cross section, and the long axis direction Y-Y of the oval is aligned with the reinforcing material 3.
oriented in a direction perpendicular to the direction in which it is attached.

The oval shape is, for example, 55.0 mm along the major axis Y-Y and 25.0 mm along the minor axis X-X by flattening a conventional circular shape with an outer diameter of 42.7 mm using a press. . As a result, the vertical support force can be increased to about twice that of the conventional structure.

``Effect of the invention'' According to the invention, the vertical supporting force of the vertical member 1 can be increased mechanically and rationally, so even in the case of thick floor slabs such as those used in nuclear power plant construction, it is possible to It can be assembled into a formwork support using the same pattern as the arrangement of the pillars and walls.In this case, the framework scaffolding used for column and wall construction can be used as it is for the floor formwork support without dismantling it, reducing the trouble of rearranging it. can be eliminated, the process can be shortened, and the amount of temporary construction materials can be reduced.

In addition, it can be used in combination with conventional general building frames, can use conventional parts as is, does not require major changes to the conventional manufacturing process, and is inexpensive to manufacture.

Furthermore, it can be used not only for nuclear power plant construction, but also for general buildings, such as temporary support for steel truss beams, etc., and support under RC beams.

[Brief explanation of drawings]

Figures 1 to 3 show embodiments of the present invention.
The figure is a front view, FIG. 3 is a sectional view along the line of FIG. 1, FIG. 3 is an enlarged view of the main part of FIG. 2, and FIGS. 5 is a front view, FIG. 5 is a sectional view taken along the line of FIG. 4, and FIG. 6 is an explanatory view. 1...Vertical member, 2...Horizontal member, 3...Reinforcement material, 11
...joint part, 12...middle part.

Claims (1)

[Scope of utility model registration request] In a steel pipe construction frame in which a reinforcing material 3 is attached to one side of the vertical member 1, the longitudinal member 1 is flattened to have an oval cross section at a portion other than the joint part, and the long axis direction of the oval is aligned with the reinforcing material 3. A building frame characterized by a direction perpendicular to the installation direction.