JPH0120411Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to steel structures such as cranes, and in particular, a joint structure in which a pair of joint members of the same shape having a plurality of protruding engagement portions are combined with each other to connect steel frames to each other. Regarding.

For example, in steel structures such as tower cranes and truck cranes, joints are used to increase the size of the structure by joining steel frames such as booms.

A typical example of such a joint is shown in FIG. That is, one joint member 1 has one centrally protruding engaging portion 2, and this one centrally protruding engaging portion 2 is connected to the two side end protruding engaging portions of the other joint member 3 serving as the other partner. 4, and these central protruding engaging portions 2 and side end protruding engaging portions 4 are connected by pins 5. In other words, the conventional joint structure was unbalanced, with one joint member 1 having one protruding engaging portion 2 and the other joint member 3 having two protruding engaging portions 4. . Therefore, when a tensile force or a compressive force is applied in the longitudinal direction of the joint members 1, 3, a large shearing force is applied to one central protruding engagement portion 2, and this portion is likely to be damaged. Also,
Even when bending stress is applied in a direction perpendicular to the longitudinal direction or torsional stress is applied, a large load is applied to one centrally protruding engaging part 2 because the engaging parts are two-to-one. is applied, and the part concerned may be damaged, or the pin 5 may be bent in an incorrect direction even with a slight force. These problems are ultimately caused by an unbalanced joint structure.

The present invention has been made in view of the above-mentioned problems and provides an advanced joint structure for steel frame buildings, the purpose of which is to improve the strength against shearing and bending.

To this end, in the present invention, a pair of joint members having exactly the same shape and having a plurality of protruding engaging portions are combined with each other and connected with a pin.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a perspective view of the joint member 6 used in the joint structure according to the present invention, and FIG. 3 is a sectional view showing the joint structure according to the present invention.

In the joint structure according to the present invention, the joint member 1 has one centrally protruding engagement portion 2 as in the conventional case.
and another joint member 3 having two side end engaging portions 4.
Rather than using two different types of joint members 1 and 3, a joint member 6 having essentially the same shape (here, "essentially" means at least with respect to the protruding engagement part) is used. ) are used in combination facing each other. This makes the joint structure according to the present invention very simple and well-balanced.

Regarding the joint member 6 alone, the joint member 6 has a flat base 8 that is welded to the end of a steel frame 7 such as a boom using a well-known welding technique. Regarding this base 8, there is no problem even if the shapes of the pair of joint members 6 are slightly different from each other, but in order to increase the manufacturing efficiency of the joint members 6, it is of course necessary to
It is also preferable that the pair of joint members 6 are completely the same.

A side end protruding engaging portion 10 is formed at the side end of the base portion 8 and has a pin hole 9 extending through the center thereof. This side end engaging portion 10 is, of course, integral with the base portion 8, and is usually made of the same material as the base portion 8, and is erected approximately at right angles to the flat base portion 8. In other words, this side end protruding engagement part 10 is a wall body perpendicular to the base part 8, and a pen hole 9 through which a pin 11 passes is bored approximately in the center thereof.

An intermediate protruding engagement part 12 is provided at a constant interval from the side end protruding engagement part 10, which will be described later. This intermediate protruding engaging portion 12 is connected to the side end protruding engaging portion 1.
0, it is a wall body parallel to the side end protruding engaging portion 10, and is raised almost perpendicularly from the base portion 8. Of course, a pin hole 13 is also provided almost at the center of the intermediate protruding engagement portion 12, but this pin hole 13 is for the pin 11 to pass through, and is similar to the pin hole 9 of the side end protruding engagement portion 10. There is no need to say too much that it is compatible.

The intermediate protruding engaging part 12 of the pair of joint members 6 is located between the side end protruding engaging part 10 and the intermediate protruding engaging part 12, which are two parallel walls provided upright on the base 8. (See Figure 3.)
An intermediate space 14 is secured. This intermediate space 1
4 is a so-called groove between two consecutive wall bodies, and as shown in FIG. 3, the groove width is slightly wider than the thickness of the pair of intermediate protruding engaging portions 12. Note that, when the intermediate protruding engaging part 12 is assembled and inserted into the intermediate space 14, a slight gap remains between the tip of the intermediate protruding engaging part 12 and the groove bottom.

Moreover, the intermediate space 1 beyond the intermediate protruding engagement portion 12
On the side opposite to 4, a side end cavity 15 is secured. This side end cavity 15 is, as shown in FIG.
It has a width sufficient to accommodate the side end protruding engaging portions 10 of the pair of joint members 6.

As can be understood from the drawings, the intermediate protruding engaging part 12 and the side end protruding engaging part 10 taper as they ascend from the point where they join with the base 8 to the tip. Furthermore, in the longitudinal direction of the coupling pin 11 in FIG. The design may be changed to 2:3, etc. More essentially, the thickness of the side end protruding engaging portion 10 of one joint member 6 and the thickness of the intermediate protruding engaging portion 12 of the other joint member 6 (therefore, the width of one intermediate space 14 ) is 1/2 of the width of the entire joint (i.e., the base 8).

In the pair of joint members 6, the other intermediate protruding engaging part 12 is fitted into one intermediate cavity 14, the other side end protruding engaging part 10 is inserted into one side end cavity 15, and the pin hole A coupling pin 11 is fitted into 9 and 13 to integrate them. Of course, this coupling pin 11 may be of the split pin type shown in the figure or of a nut type.

When the building is completed, the connecting pin 1
1 and the intermediate and side end protruding engaging parts 12, 10, various stresses such as shearing stress and bending stress are applied, but in the joint structure according to the present invention, unlike the conventional one, Since the central projecting engagement portion 2 of the book does not take on any tensile force or the like, in other words, both of the pair of joint members 6 have the same shearing area, so the shearing strength is increased. By the way, a trial calculation using the example shown shows an increase of about 1.5 times. Also,
The strength against bending stress was also greatly increased. This means that the pair of joint members 6 are essentially the same,
This is due to the well-balanced joint structure. Furthermore, instead of preparing two types of joint members, you only need to prepare exactly the same one.
Mass production is easy, manufacturing costs can be reduced, and inventory management is also easy. Furthermore, since the symmetrical walls can be used as guides during engagement, assembly can be carried out easily and quickly on site.

[Brief explanation of drawings]

FIG. 1 is a half-sectional view showing a conventional joint structure, FIG. 2 is a perspective view of a single joint member used in the joint structure according to the present invention, and FIG. 3 is a diagram showing the joint structure according to the present invention. The sectional view, FIG. 4, is a side view of FIG. 3. 6... Joint member, 7... Steel frame, 8... Base,
9, 13... Pin hole, 10... Side end protruding engagement part,
11... Connection pin, 12... Intermediate protruding engagement part, 1
4...middle space, 15...side end space.

Claims (1)

[Scope of utility model registration request] A base part welded to the end of the steel frame, a side end protruding engaging part that is integral with the base part and erected at almost right angles to the side end thereof and having a pin hole in the center, and a fixed part from the side end protruding engaging part. an intermediate protruding engaging part that stands upright from the base substantially parallel to it at intervals and has a pin hole approximately in the center; and the side end protruding engaging part so as to receive the intermediate protruding engaging part of the pair of joint members. An intermediate space secured between the intermediate protruding engaging part and the side end protruding engaging part of the joint member forming a pair on the opposite side of the intermediate void with respect to the intermediate protruding engaging part is received. A joint structure for a steel-framed building, in which a pair of joint members having side end cavities are assembled so as to face each other, and a coupling pin is inserted into a pin hole of the pair of joint members.