JPH0428065B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a composite beam structure formed by connecting two adjacent beams with a gap between them.

(Prior Art) For example, in prefabricated houses, a plurality of house units are assembled at a construction site, each of which has a box-shaped frame by connecting beams between the upper and lower ends of columns. By the way, the upper beam of the house unit on the lower floor and the lower beam of the house unit on the upper floor are arranged vertically adjacent to each other, and conventional efforts have been made to increase the strength of the beams by connecting these beams. It is. In addition, since the strength of a beam is proportional to the cube of the height of the beam, it is preferable to connect the beams as one unit and make the combined beam structure equivalent to a single beam. .

As a conventional composite beam in which beams are connected to each other, there is one seen in Japanese Utility Model Publication No. 15924/1983. That is, a connecting plate is spanned between the web parts of the beams arranged above and below, and one through hole is formed in each of the upper and lower parts of the connecting plate, and one through hole is formed in each of the upper and lower beams. . The beams were connected to each other by inserting the shank portions of the bolts into these insertion holes and tightening them together with nuts.

There is also a composite beam structure in which beams are connected using high tension bolts. For example, by forming insertion holes in the upper flange of the lower beam and the lower flange of the upper beam, inserting the shank portion of a high-tension bolt into each of the insertion holes and tightening it together with the nut, the beam can be tightened. They were connected to each other.

(Problem to be Solved by the Invention) However, in the composite beam structure of Utility Model Publication No. 57-15924, in order to absorb manufacturing errors and assembly errors of the house unit, at least the insertion holes of the beam or the connecting plate are The diameter of the bolt must be larger than the shank of the bolt. Therefore, with the normal tightening force of bolts and nuts, the connecting plate will move relative to the beam when a large load is applied. It was not possible to firmly connect the beams together.

In addition, in the structure of composite beams that are connected using high-tension bolts, even though there is a gap between the shank of the high-tension bolt and the insertion hole to absorb errors, the tightening force is strong, so the beams The connection between the two can be strengthened. However, since a large-sized tightening device is required, the tightening operation is difficult.

(Means for Solving the Problems) This invention was made to solve the above problems, and its gist is to solve the problem on the lower floor when box-frame house units are assembled one above the other at a construction site. Regarding the connection between the upper beam of
A main beam, a connection plate that spans the two beams and has an insertion hole formed in a part corresponding to the space between the beams, and a plurality of holes protruding from the top and bottom of the connection plate and inserted into the holes of the beam. a guide pin with a tapered surface; a threaded rod that is inserted into the insertion hole of the connection plate and has a locking portion at its tip that is locked to both beams;
The composite beam structure is characterized by comprising a nut screwed onto the threaded rod to tighten the connecting plate and the beam.

(Operation) A threaded rod is inserted between two adjacent beams with a gap in between, and the locking portion of the threaded rod is locked to both beams. Next, the connecting plate is bridged, the guide pin of the connecting plate is inserted into the hole of the beam, and the threaded portion of the threaded rod is inserted into the insertion hole of the connecting plate to screw the nut. When this nut is tightened, the tapered guide pin of the connection plate is fitted into the hole of the beam.

(Example) Hereinafter, an example of the present invention will be described based on the drawings from FIG. 1 to FIG. 4.

As shown in FIG. 3, the first floor of a prefabricated house is assembled by adjoining a plurality of house units 1, for example four, which have been prefabricated in a factory. The frame of this house unit 1 consists of four pillars 2
and a beam 3 connecting the upper and lower ends of each column 2, forming a box shape. Necessary structural members such as the ceiling material 4 are attached to this frame. In addition, the beam 3 is formed narrower than the width of the column 2, and is connected at a position recessed inside the house unit 1 rather than the outer surface 2a of the column 2. A sufficient distance D is provided between the beams 3.

The house unit on the second floor is constructed in the same manner, and its pillar is mounted on and connected to the column 2 of the house unit 1 on the first floor. And Figure 1,
As shown in Figure 4, the first floor house unit 1
A lower beam 5 of the second floor house unit is placed on top of the upper beam 3 with a gap h in between.
0 and a nut 30.

The upper and lower beams 3 and 5 are made of steel, and the web portion 3
a, 5a, and upper flange portions 3b, 5b extending horizontally inward from the upper ends of the web portions 3a, 5a,
The web portions 3a, 5a have lower flange portions 3c, 5c extending horizontally from the lower ends thereof, forming a U-shape in longitudinal section. A large number of holes 3 are provided in the web portions 3a and 5a.
d and 5d are formed respectively.

The connection plate 10 has a U-shaped cross section and includes a flat portion 11 and a pair of flange portions 12, 12 bent at right angles from both side edges of the flat portion 11. There are four insertion holes 13 in the upper and lower parts of the flat part 11, two in total, and an insertion hole 13 in the middle part.
Two insertion holes 14 each having a larger diameter are formed. Guide pins 15 are provided protruding from the upper and lower portions of the flat portion 11 . This guide pin 15 is
A shank portion 16 having a threaded portion and a tapered surface 17
The shank portions 16 are inserted into the small diameter insertion holes 13 and fixed to the flat portion 11 with nuts 19. Note that the shank portion 16 has a diameter that is approximately the same as that of the insertion hole 13 but slightly smaller. Also, the diameter of the tip of the head portion 18 is
The diameter of the proximal end is smaller than holes 3d and 5d of hole 3.
d, which is larger than 5d.

The threaded rod 20 includes a threaded portion 21 and a flat arrowhead portion 22 (locking portion) provided at the tip thereof. The threaded portion 21 has an outer diameter that is approximately the same as or slightly smaller than the diameter of the insertion hole 14 of the connection plate 10 and the gap h between the upper and lower beams 3 and 5.

The nut 30 is screwed onto the threaded portion 21 of the threaded rod 20 via a washer 31. Note that 40 is a spacer made of hard rubber or the like, and is interposed in the gap h between the upper flange portion 3b of the beam 3 and the lower flange portion 5c of the beam 5.

In the above configuration, the beam 3 on the first floor and the beam 5 on the second floor are connected. To explain in detail, first, the spacer 40 is inserted into the gap h between the flange portions 3b and 5c of the beams 3 and 5. Next, sandwiching this spacer 40,
Two threaded rods 20 are inserted into the gap h between the flanges 3b and 5c. At this time, the threaded rod 20 can be inserted from the outer surface of the beams 3 and 5 by making the arrowhead portion 21 horizontal. After insertion, rotate the threaded rod 20 by 90 degrees to make the arrowhead part 21 vertical.
The inclined rear edge 22 of the arrowhead portion 21 is engaged with the edges of the respective flanges 3b and 5c. In this engaged state, the threaded portion 21 of the threaded rod 20 is connected to the flange portion 3.
It protrudes outward from between b and 5c.

From this state, the connecting plate 10 is bridged between the beams 3 and 5, and the guide pins 15 of the connecting plate 10 are inserted into the holes 3d and 5d of the web portions 3a and 5a of the beams 3 and 5.
At the same time, the flange portions 3 of the beams 3 and 5
Threaded portion 2 of threaded rod 20 protruding from b, 5c
1 is inserted into the insertion hole 14 of the connection plate 10. At this time, since the outer diameter of the tip of the head portion 18 of the guide pin 15 is smaller than the holes 3d and 5d of the beams 3 and 5, the guide pin 15 can be inserted reliably even if there are manufacturing errors or assembly errors in the house unit 1. Next, the above threaded rod 2
Screw the nut 30 onto the threaded portion 21 of 0 and tighten. Tapered surface 17 of head portion 18 of guide pin 15
Tighten the nut 30 until it joins the holes 3d and 5d of the beams 3 and 5. Due to the guiding action of the tapered surface 17, the above-mentioned error can be eliminated and the relative positional relationship between the beams 3 and 5 can be accurately corrected.
The centers of d and 5d can be aligned with the axis of the guide pin 15. Furthermore, the flange portions 3b and 5c of the beams 3 and 5 are deformed so as to approach each other due to the guiding action of the inclined rear edge 22 of the arrowhead portion 21, so that the spacer 40 can be held between these flange portions 3b and 5c. . This spacer 40 made of hard rubber prevents vibrations on the upper floor from being transmitted to the lower floor via the beams 3 and 5.

As mentioned above, since the guide pins 15 of the connection plate 10 are fitted into the holes 3d and 5d of the beams 3 and 5 without any gaps, the connection plate 10 is aligned with the beams 3 and 5 in a direction parallel to the wet parts 3a and 5a. The beams 3 and 5 are firmly connected to each other via the connection plate 10 without shifting. The composite beam structure formed by integrating the beams 3 and 5 is substantially equal to the height H of the beams 3 and 5.
It functions as a single beam with a height approximately twice that of the
This means that it has about eight times the strength of beams 3 and 5, and its strength is significantly improved.

Also, the beams 3, 3 of the adjacent house units 1, 1
Since a certain gap D is provided between them, operations such as spanning the connection plate 10, inserting the threaded rod 20, and tightening the nut 30 can be easily performed. Moreover, since all the work can be done outside the beams 3 and 5 (outside the house unit 1), the work can be simplified in this respect as well.

FIG. 5 shows another embodiment. In this embodiment, the base of the guide pin 15' is fixed to the flat part 11 of the connecting plate 10 by welding or the like. Also, the holes 3d' and 5 in the web portions 3a and 5a of the beams 3 and 5
d' also has a tapered surface. In this embodiment, when tightening, the tapered surface 17' of the head portion 18' of the guide pin 15' joins with the tapered surfaces of the holes 3d' and 5d'. Note that members corresponding to the above-described embodiments are designated by the same numbers in the drawings, and explanations thereof will be omitted.

This invention is not limited to the above embodiments and can be modified in various ways. For example, the number of insertion holes formed in the connection plate is not limited to two, but may be one or more.

(Effects of the Invention) As explained above, in this invention, the tapered guide pin of the connection plate is fitted into the hole of the beam without any gap, so the beams are firmly and integrally connected to each other. Become. As a result, the composite beam structure has the same strength as a single beam, and the strength is significantly improved. Further, the work is simple because the beam and the connecting plate can be connected by simply inserting the threaded rod between the beams, inserting the guide pin into the hole in the beam, and screwing and tightening the nut onto the threaded rod.

[Brief explanation of drawings]

1 to 4 show embodiments of the present invention, and FIG. 1 is an enlarged vertical cross-sectional view of part A in FIG. 3, and FIG. 2 is a cross-sectional view taken along the line - in FIG. ,
FIG. 3 is a partially sectional plan view of adjacent house units, FIG. 4 is a perspective view of the combined beam structure, and FIG. 5 is a vertical sectional view showing another embodiment. 3, 5...beam, 3d, 5d, 3d', 5d'...insertion hole, 10...connection plate, 14...insertion hole,
15, 15'... Guide pin, 17, 17'... Tapered surface, 20... Threaded rod, 22... Arrowhead portion (locking portion), 30... Nut.

Claims (1)

[Scope of Claims] 1. When box-frame house units are assembled vertically at a construction site, the upper beam on the lower floor and the lower beam on the upper floor are connected to each other with a space between them. Two beams each have a plurality of holes formed therein, a connection plate spans between the two beams and has insertion holes formed in areas corresponding to the spaces between the beams, and a plurality of holes in the top and bottom of the connection plate. A guide pin with a tapered surface that protrudes individually and is inserted into the hole of the beam, a threaded rod that is inserted into the insertion hole of the connection plate and has a locking part at its tip that is locked to both beams, and this screw. A composite beam structure comprising a nut screwed onto a rod to tighten the connecting plate and the beam.