JPS63181816A - Constituent material for underground beam - Google Patents

Abstract

PURPOSE:To simplify construction works of formwork and reinforcing bar arrangement as well as provide a structurally sufficient bearing forces for underground beams by a method in which the first steel plate and the second steel plate are integrated, and a shearing-transmitting part is provided on the opposite side of the first steel plate. CONSTITUTION:A pair of the first steel plate 2 and the second steel plate 2 are integrated by welding with bolt connection to make up an underground beam constituent part of a square cylindrical traversal form. The constituent parts are connected with columns, etc., by welding or bolts, reinforcing bars are set for the base, and concrete is packed into funnels 7 and injection holes, while reassuring the packing condition of concrete from an eyehole 5. A pair of the first steel plate 1 serves as the main beam and a pair of the second steel plates 2 serve as hoop beam or stirrup.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to underground beam constituent materials that constitute underground beams in building foundations.

(Prior Art) As a material for constructing a beam, conventionally, as shown in Japanese Patent Publication No. 54-3527 and Japanese Utility Model Publication No. 58-53363, a steel plate braced with U IFe is used as a formwork. Used as a trench structure, the top end reinforcing bars of the beam are placed above the opening of the U-shaped copper plate, and inverted U-shaped insert bars are placed on the top end reinforcing bars, and concrete is filled to bury these reinforcing bars. There are known devices configured to do so.

In addition, as shown in Japanese Patent Application Laid-Open No. 61-165452, two (2) section steels are arranged with a distance between them so that their webs face each other, and a formwork is attached at a predetermined location. A structure is known in which the space surrounded by the formwork, flange and web is filled with concrete.

(Problems to be solved by the invention) However, in the case of the conventional example having such a configuration,
In the case of benders, it is necessary to arrange reinforcing bars within the U-shaped steel plate, which has the drawback of requiring time and effort to arrange the reinforcing bars, which increases the construction period.

On the other hand, in the latter case, each of the two H-beams must be placed at a predetermined distance from each other, and it also requires a small formwork and its installation, which is different from the case described above. Similarly, it had the disadvantage of increasing the construction period.

The present invention was developed in view of these circumstances, and while having sufficient structural strength and tenacity, it simplifies form work and reinforcement work during on-site construction, significantly shortening the construction period. The aim is to reduce the

(Means for Solving the Problems) In order to achieve the above object, the underground beam component of the present invention includes first steel plates facing each other in the vertical direction and having a shear force transmitting portion on the opposing surface side. A second steel plate facing horizontally is integrated to have a rectangular cross-sectional shape, and a concrete injection hole and a peephole for checking the filling state of concrete are formed in the first W4 plate or the second W4 plate. and configure.

(Function) According to the above configuration, at the factory stage, each pair of first! ! The i-plate and the second steel plate are integrated by welding or bolting to produce a box-shaped cylindrical underground beam with a rectangular cross section, and the underground beam components are transported to the site. After joining columns etc. by welding or bolting, and placing reinforcement on the base, concrete is filled through the injection hole, and the filling condition is confirmed through the peephole. When it acts, a pair of second
While the steel plate acts as a hoop reinforcement or stirrup reinforcement,
It is possible to obtain underground beams that can exhibit greater rigidity using filled concrete.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

<First Example> FIG. 1 is an overall perspective view showing a first example of an underground beam component according to an example of the present invention, and FIG. 2 is a cross-sectional view of the first example.

In these figures, 1.1 is the first jli plate, 2.2
is a second steel plate, in which the first steel plates 1.1 are vertically opposed to each other, the second steel plates 2, 2 are horizontally opposed to each other, and the 18th steel plate 1.1 and the second steel plate 2.2 are opposed to each other in the horizontal direction. Both ends of the underground beam component A are welded to each other, and the underground beam component A has a cylindrical shape with a rectangular cross-sectional shape as a whole.

Projections 3 are provided on the opposing surfaces of each of the first steel plates 1.1 along the longitudinal direction, and when the inside is filled with concrete, shear force is transmitted between the first steel plates 1.1 and the concrete. is configured to do so. As a structure for transmitting this shear force, for example, bolts may be provided so as to protrude inward from the outer surface of the first steel plate 1.1, and these are referred to as shear force transmitting parts.

F-shaped stud bolts 4, which are integrated with the concrete of the floor slab, are connected by welding to predetermined locations on the upper surface of the upper one of the first J1M plates 1.1.

Further, peep holes 5 are formed in the upper first steel plate l at predetermined intervals in the longitudinal direction thereof, for checking the filling state of concrete.

Each of the second steel plates 2.2 has a wall thickness smaller than that of the first M plate 1 (for example, about 1710 mm of the first steel plate L), and has a lower end at both longitudinal ends of each of the 214 temporary plates 2.2. A rectangular notch 2a is formed on the side, and this notch 2a is used when butt welding is performed on a column or beam.
・It is configured to perform welding work through.

In addition, a concrete injection hole 6 is formed at a predetermined location on the upper end of each of the second f and If plates 2, 2, and a concrete injection hole 6 is formed in the injection hole 6 with a concrete injection hole 7 formed of a thin steel plate, wood, plastic, etc. It is now possible to install it by fixing it and filling the inside with concrete.

The injection holes 6 may be formed, for example, so as to have an opening width of about 10 cm every 1 m.

Furthermore, on the lower end side of each of the second JFJL plates 2, 2,
Insertion holes 8 for reinforcing bars are formed.

In addition, although not shown, in each of the second steel plates 2.2, the parts that come into contact with the outside air after the base concrete C and floor slab concrete D, which will be described later, are placed are galvanized to prevent rust from forming. For example, it may be coated with a weather-resistant resin such as evoki resin.

Furthermore, if necessary depending on the properties of the building, the second steel plates 2.2 may be connected with long ports 9 at locations with large stress to prevent buckling, as shown in Figure 2. Stop it.

As a structure for preventing this buckling, for example, the second steel plate 2
．． 2. Ribs extending in the vertical direction may be provided on the opposing surfaces of each of the two.

With the above configuration, as shown in FIG.
・Place the underground beam components A... between them, adjust the level by interposing fillers (U and Z shown in the figure) under them as appropriate, and then As shown in each enlarged view of the main part of the figure, the end face of the first rope plate l on the lower side of the underground beam component A1, which is long and has the same structure as the underground beam component A, is connected to the underground beam component A. A butts against the lateral end face of the first steel plate 1 on the lower side of A, and connects by butt welding through the notch 2a, and similarly, the first steel plate 1 on the upper side of the underground beam component A. The end face is the upper part of the underground beam component A.
It is connected to the groove side end face of the steel plate L by butt welding, and the longitudinal edge of the second rope plate 2, 2° of the underground beam component A1 is connected to the second rope plate 2° of the underground beam component A1. Connected to the plate surface of No. 2 by fillet welding, and furthermore, these underground beam constituent members A and column L
O is connected by similar welding.

Then, as shown in the enlarged views of the main parts in FIG. 3(b) and FIG. 5, the reinforcing bars 11 are inserted into the reinforcing bar insertion holes 8.
・Insert the
2... and the lower end reinforcement 13... are arranged.

After that, as shown in Figure 3 (C), base concrete C is poured, and underground beams (1. Concrete is placed inside the container, and the filling condition is checked through the peephole 5. If there are any gaps inside, high-strength mortar is injected.

Thereafter, as shown in FIG. 3(d), the deck plate 14 is erected over the underground beam constituent members A, A..., and the upper end reinforcements 12a... and the lower end reinforcements +3a...
Place reinforcement.

Above these, as shown in FIG. 3(e), a floor slab concrete D for the lowest floor is poured to construct an underground framework. At this time, the upper steel column may be erected.

In addition, the above-mentioned underground beam configuration iA, A, concrete 1
・Prior to pouring, nails are driven from the outside of the second steel plates 2.2 in order to ensure good transmission of shear force between the second steel plates 2.2 and the concrete inside. good.

<Second Embodiment> FIG. 6 is a perspective view of the second embodiment, and the features of this second embodiment are as follows.

That is, instead of inserting the reinforcing bars 11 in the first embodiment, the reinforcing bars 1.
A temporary comb 15 is connected to the lower end side of each of the l plates 2.2 by welding to increase the connection strength with the base concrete C. The other configurations are the same as those in the first embodiment, and their explanation will be omitted.

<Third Embodiment> FIG. 7 is a perspective view of the third embodiment, and the features of this third embodiment are as follows.

That is, the length of the first W4 plate 1.1 in the longitudinal force direction is set to the second constraint 2.1.
2, and at each of its longitudinal ends,
A flange portion I7 having a first bolt hole 16 is formed, and second bolt holes 18 are formed at both ends of each of the second bolt holes 2.2, and as shown in FIG.
It is configured so that it can be joined to a flange member 19 that is connected to each of the four sides by welding in advance.

More specifically, as shown in FIG. 9, the edges of the flange portion 17 of the lower first steel plate I and the flange member I9 that opposes it are butt welded, while the two sides are welded together. The flange portion 17 of the first W4 plate 1 and the flange member 19 are sandwiched between a pair of plates 20 and 20, and connected by high-strength ports 21 through the first bolt holes I6, and further, Plates 22.22 are arranged on the outer surface side of each of the second JRIi plates 2.2, and these plates 22.22 are connected to the second W4 plate 2.2 by high-strength bolts 23 through the second bolt holes 18... Then, the other end of the plate 22.2.2 is connected to the flange member 19 by high-strength bolts 24, and the four plates 20, 20, 22.22 and high-strength bolts 21.23 are connected.
..., 24..., and the underground beam component A and the column 10 are connected via butt welding. At this time, the gap between the two ends of the plates 22 and 22 and the flange portion 17 of the upper first rope l can be closed by gluing a plate made of a suitable material such as a steel plate, wood, or plastic. Good.

In the above embodiment, each of the underground beam constituent members A and A is
The steel plate 1.1 and the second FG4 temporary 2.2 may be integrated by welding, or in the present invention, they may be integrated by bolted connection.

Further, in the above embodiment, the thickness of the second steel plate 2 is set to 1'I1.
Although it is made considerably thinner than the 4-plate L, it is possible to secure the necessary strength while reducing the material used.
It may be configured to have the same wall thickness as the first steel plate l.

(Effects) As described in 2 below, according to the present invention, the 114th plate and the second steel plate are integrated with each other, and the shear force transmission portion is provided on the opposing surface side of the first steel plate. The function of the main reinforcement, which previously required reinforcement, can be performed by the first steel plate, and the functions of the hoop reinforcement and stirrup reinforcement can be performed by the second steel plate, and the concrete filled inside provides great rigidity. In addition, the first and second steel plates can form a closed cross section to increase torsional rigidity, so while the structure as a whole has sufficient strength and toughness, it can also be used around underground beams. This eliminates the need for formwork work and also eliminates the need to place reinforcement inside the formwork, simplifying formwork work and reinforcement work during on-site construction, and greatly reducing the construction period.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view showing a first embodiment of an underground beam component according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the first embodiment, and FIG. 3 is a construction process. 4 and 5 are enlarged views of the main parts, FIG. 6 is an overall perspective view of the second embodiment, FIG. 7 is an overall perspective view of the third embodiment, FIG. 8 is a perspective view of a column when applying the third embodiment;
FIG. 9 is a side view showing the state of connection with the pillar of the third embodiment. ■...First rope plate, 2...Second E plate, 3...Protrusion as a shear force transmission part, 5...Peep hole, 6...Injection hole.

Claims (1)

[Claims] (1) A first steel plate facing in the vertical direction and having a shear force transmitting portion on the opposing surface side is integrated with a second steel plate facing in the horizontal direction to have a rectangular cross-sectional shape, and the first steel plate or An underground beam component characterized in that a concrete injection hole and a peephole for checking the filling state of concrete are formed in the second rope plate.