JPH0439858Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a joint for a guard fence, for example, for connecting the beams of a guard fence installed on a sidewalk or roadway, especially its workability, strength, and appearance. This is related to the improvement of.

[Prior Art] Fig. 15 is a side view showing a conventional joint for a protective fence connecting box beams, and Fig. 16 is a cross-sectional view thereof. A pair of joint plates 5 attached to the inner upper and lower surfaces of the beam are bolts for fixing the joint plate 3 to the square tube beam 1, and the joint plates 3 are threaded to correspond to the bolts 5.

Fig. 17 is a side view showing a conventional joint for a protective fence connecting guard pipes, etc., and Fig. 18 is a cross-sectional view thereof. In the figure, 7 is a round pipe beam, 9
11 is a joint pipe inserted into the round pipe beam, and 11 is a bolt/nut (through bolt) for fixing the joint pipe 9 to the round pipe beam 7.
In addition, in these figures, the gap between the round pipe beam and the joint pipe 9 is drawn large for convenience of drawing.

Fig. 19 is a sectional view showing an aluminum railing for vehicles, which is a conventional protective fence, and Fig. 20 is a side view thereof. In the figure, 13 is a column, 15 is a round pipe beam supported by this column, and 17 is a A joint tube inserted into this beam, 19 is a round head bolt, 21 is a hexagonal bolt/nut, and 23 is an anchor bolt. The joint pipe 17 is threaded to correspond to the bolt 19, and the beam 15 is fixed by the joint pipe 17.

Fig. 21 is a side view showing another type of railing that is a conventional protective fence, and Fig. 22 is a cross-sectional view thereof. In the figure, 25 is a round pipe beam, and 27 is a joint inserted into this round pipe beam. Pipe 29 is a bolt and nut that fixes the joint pipe to the round pipe beam. This nut is welded to the joint pipe 27.

[Problems that the invention aims to solve] Among the conventional joints for protective fences mentioned above, the screw-cut and nut-welded joints can be connected firmly without rattling, but the bolts are fixed in position, making them difficult to install. It is not possible to absorb errors, it is necessary to increase the precision of length cutting, and in the case of powder coating, it is necessary to seal the threaded part to prevent paint from getting on it. It was hot.

In addition, although the through-bolt type has good workability and workability and has the effect of preventing bolt loosening, it has a poor appearance because the bolt head and nut protrude outside, and it is difficult to fill the gap between the beam and the joint. First, there were problems in that looseness was likely to occur between the beam and the joint, and it was difficult to align the front and rear beams.

[Means for solving the problem] The joint for a protective fence according to this invention includes a joint pipe with an outer diameter that can be fitted into a beam, and a nut integrally formed with a recess in a part of the joint pipe. It comprises a mounting part, a blind nut that is mounted on the nut mounting part using a nut holding plate, and a bolt that is screwed into the blind nut, and the nut mounting part has an oval nut insertion hole. The nut holding plate has an opening, and the branded nut has a length at a lower portion, and the length is longer than the thickness of the nut attachment portion and extends from the nut attachment portion. The diameter of the long axis of the length is shorter than the diameter of the long axis of the nut insertion hole, and the diameter of the long axis of the length is shorter than the diameter of the long axis of the nut insertion hole. longer than the short axis diameter,
The diameter of the short axis of the length is shorter than the diameter of the short axis of the nut insertion hole, and a pair of grooves into which the nut holding plate is fitted are formed on the long axis side of the length,
The above problem is solved by configuring the distance between the grooves to be shorter than the length of the opening in the longitudinal direction.

[Operation] In this invention, when the beam and the joint pipe are tightened with bolts, a portion of the beam or the joint pipe bends due to the step. Further, if the diameter of the long axis of the nut insertion hole of the joint pipe is longer than the diameter of the long axis of the length of the blind nut, the blind nut will slide.

[Example] Fig. 1 is an explanatory diagram showing a state in which a joint according to this invention is attached to a beam of a protective fence.
As shown in this figure, a joint pipe 2 (sleeve),
A nut attachment part 4 formed on this joint pipe, a blind nut 8 attached to this nut attachment part using a nut holding plate 6, and a screw threaded into this blind nut from the outside of the joint pipe 2 via a washer 10. It consists of a bolt 12 inserted.

The joint pipe 2 is made of a square pipe, and a part of it is cut out, and a steel plate is welded from the inside of the joint pipe 2 in a backing state to the cut-out part, and a nut mounting part 4 is attached to the cut-out part. As shown in FIG. 2, an elongated nut insertion hole 14 is formed in this nut mounting portion. The welded part 16 between the joint pipe 2 and the nut attachment part 4 is stepped by the thickness of the joint pipe 2. Here, the nut attachment part 4 is formed by welding a steel plate to the joint pipe 2, but the nut attachment part 4 may be formed by recessing a part of the joint pipe as shown in FIG. .

A nut mounting portion 4 is provided at the bottom of the blind nut 8.
As shown in FIGS. 4 and 5, an elliptical cylindrical length portion 18 having an outer diameter that can be inserted into the nut insertion hole 14 is formed. The length of the length portion 18 is shorter than the sum of the thickness of the nut mounting portion 4 and the thickness of the joint pipe 2. In other words, when the blind nut is attached to the joint pipe, the lower end of the nut length is shorter than the outer shape of the joint pipe. The structure is such that no one can go outside. Length 18
As shown in FIGS. 5 and 6, a pair of grooves 20 are formed on the long axis side of the groove 20 to face each other. Although the shape of the upper part 22 of the blind nut 8 is square in the example of FIG. 5, the shape of this upper part 22 is not limited to the square, and may have other shapes,
For example, it may be round, hexagonal, or other shapes. A threaded portion 24 is formed at the center of the blind nut 8.

The nut holding plate 6 is made of a thin steel plate, and has a rectangular opening 26 formed in the center as shown in FIG. The width of the opening 26 is approximately the same as the length of the short axis of the length 18, and the length of the opening 26 is slightly shorter than the length of the long axis of the length 18, and is approximately the same as the width of the pair of grooves. ing. Nut holding plate 6
A slit 28 is formed in each corner of the opening 26 in the length direction. Although the shape of the nut holding plate 6 is rectangular in the example shown in FIG. 7, it is not limited to this, and may have a shape other than this.

The joint configured as described above is used by being attached to a beam as shown in FIG. That is, the length part 18 of the blind nut 8 is inserted into the nut insertion hole 14 of the nut attachment part 4 of the joint pipe 2, and the joint pipe 2 with the nut holding plate 6 fitted into the groove 20 of the length part 18 is inserted into the beam 30. The bolt 12 is inserted into the joint and screwed in from the outside of the beam 30 through the washer 10. When the bolt 12 is strongly screwed in, the nut attachment portion 4 is deflected outward, whereby the beam 30 is firmly connected by the joint.

8 to 14 show an embodiment in which the beam is a round pipe, and numerals 2 to 30 are exactly the same as the above embodiment.

The joint according to this invention is constructed as described above and has the following features. That is,
When painting beams and joint pipes, blind nuts that do not require painting are fitted into the joint pipe last, so there is no need to seal the threads during painting. The length of the blind nut must be within the outside diameter of the joint pipe (within the step)
If you store it in the correct position, the nut will not hit during transportation or when inserting the beam. When tightening the beam and the joint pipe with bolts, the nut does not rotate, and since there is a step, a portion of the beam or joint pipe flexes, creating a spring effect that prevents the bolt from loosening. If the nut insertion hole of the joint pipe is made longer in the length direction of the beam than the length of the blind nut, the blind nut will be able to slide, and this will reduce the possibility of misalignment of the column spacing due to construction errors or the beam Can absorb deviations. Only the washers and bolt heads are visible on the outside of the beam.
Since it is only on one side, if you make this point the bottom or back side, the appearance will be very smart. By tightening the bolts, the joint tube and beam are firmly fixed, and alignment between the beams can be easily obtained.

[Effects of the invention] By configuring this invention as explained above, it is possible to firmly connect the beams in a protective fence whose beams are round steel pipes, square steel pipes, etc.
This eliminates rattling of the beam, simplifies installation work, absorbs construction errors, prevents bolts from loosening, and prevents any protrusions from appearing on pedestrians or vehicles.

[Brief explanation of the drawing]

Figures 1 to 7 show one embodiment of this invention, with Figure 1 being a sectional view, Figure 2 being a plan view of the nut insertion hole, and Figure 3 being another example of the joint pipe. Cross-sectional view, Figure 4 is a side view of the blind nut, Figure 5 is a back view of the blind nut, Figure 6 is a side view of the blind nut (the side shifted by 90 degrees from that in Figure 4), Figure 7 8 is a plan view of the nut holding plate, FIGS. 8 to 14 show other embodiments of the invention, FIG. 8 is a sectional view, FIG. 9 is a plan view of the nut insertion hole, and FIG. 10 is a plan view of the nut holding plate. 11 is a sectional view showing another example of the joint pipe, FIG. 11 is a side view of the blind nut, and FIG.
Figure 2 is a back view of the blind nut, Figure 13 is a side view of the blind nut (the side shifted by 90 degrees from that in Figure 11), Figure 14 is a plan view of the nut holding plate, and Figures 15 to 22. The figures show protective fences using conventional joints; Fig. 15, Fig. 17,
Figures 20 and 21 are side views, Figures 16 and 1.
8, 19 and 22 are cross-sectional views. In the figure, 2 is a joint pipe, 4 is a nut mounting part,
6 is a nut holding plate, 8 is a blind nut, 10 is a washer, 12 is a bolt, 14 is a hole for nut insertion, 16 is a welded part, 18 is a length part, 20 is a groove part, 22 is an upper part, 24 is a screw part, 26 28 is an opening, 28 is a slit, and 30 is a beam. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A joint pipe with an outer diameter that can be inserted into a beam, a nut mounting part that is integrally formed with a recess in a part of the joint pipe, and a blind nut that is attached to the nut mounting part using a nut holding plate. and,
The nut mounting portion has an oval nut insertion hole formed therein, the nut holding plate has an opening, and the blind nut has a bolt that is screwed into the blind nut. The lower part has a length part, and the length part is shorter than the sum of the thickness of the nut mounting part and the thickness of the joint pipe, and has an elliptical cylinder shape. The diameter of the shaft is shorter than the diameter of the major axis of the nut insertion hole and longer than the diameter of the minor axis of the nut insertion hole, and the diameter of the minor axis of the length is shorter than the diameter of the minor axis of the nut insertion hole. A pair of grooves into which a nut holding plate is fitted are formed on the long axis side of the length, and the distance between the grooves is shorter than the length of the opening in the longitudinal direction. Fittings for protective fences.