JPS6033125Y2 - Expansion joints - Google Patents

Description

[Detailed description of the invention] This invention is an expansion joint for bridge structures over rivers, valleys, elevated roads, etc., and in particular, an expansion joint consisting of an elastic material having an expansion groove and a load support plate joined to the elastic material. This invention relates to improvements to elastic absorbent parts.

Generally, this type of expansion joint has a separate structure consisting of a play support structure, a joint expansion/contraction absorbing part, and a water-stopping member, which makes the structure complex and requires time and effort to install. There were problems in terms of workability and durability, such as a decline in the functionality of the expansion and contraction device.

Therefore, in order to solve these problems, an expansion joint has been proposed in which a groove is formed in the expandable portion, a thin film portion is formed at the end of the groove, and this portion serves as the expandable portion and the stop portion.

This expansion joint is extremely effective for items that do not have a load-supporting structure made of steel materials, but for items that do have a load-supporting material, there is a large amount of expansion and contraction, especially when trying to take a large contraction, the expansion and contraction part is stretched upward. Show your way up.

Swelling in the expandable portion not only affects the running performance of the vehicle but also causes noise.

1.・4. The present invention has a structure in which an upper groove and a lower groove are formed on the front and back sides of an elastic material in the form of an elliptical cylinder with a major axis in the longitudinal direction, separated by a waterproof membrane that is convex in the cross section in the interlocking direction. , the width is narrower than the groove, the upper groove and the lower groove are arranged at intervals in the longitudinal direction of the elastic material, and a load support plate is bonded to the back side of the elastic material to form an expansion joint. The purpose of this invention is to provide an expansion joint that can expand and contract in a large amount compared to the size of the joint.

Next, embodiments of the present invention will be described based on the drawings.

1 is an elastic material made of rubber material, 2 is a load supporting structure made of steel, and the elastic material 1 has a diameter in the longitudinal direction on the front and back sides thereof.
.

The upper groove 3'' 4 has an elliptical cylindrical shape and is formed by dividing a convex shape downward in the cross section in the direction of movement by 1 5, and the lower groove 4 is formed narrower than the width 3, and the upper groove 3 and the lower groove 4 are made of an elastic rubber material. formed at intervals in the longitudinal direction of 1,
In addition, if necessary, Ushiku is formed by dividing the elliptical columnar upper groove 6 and lower groove 6a with a waterproof membrane 7, and
and are arranged alternately on both sides of the lower groove 4, and the load support plate 2 has a central portion 2a, convex portions 2b on both sides thereof, and the convex portions 2
Both sides are uneven with the recess formed between b and 2b.

8 is a guide plate, 9 is a safety in-angle, and 10 is an elastic material for shock absorption.

In the embodiment according to the present invention, in such an element, the elastic material 1 and the load support plate 2 are joined by the center part of the back surface of the elastic material 1 and the center part of the load support plate 2a, and the back surface of the convex part 2b of the load support plate 2. A shock absorbing elastic material 10 is bonded to the convex portions 2b, and a guide plate 8 is attached to the concave portion formed between the convex portions 2b.
The elastic material 1, the load support plate 2, and the guide plate 8 are arranged so as to be joined to the front surface and the back surface of the elastic material 1.
are integrated as a whole and placed on the safety angle 9.

Anchor bolts 11 are inserted one by one into the bolt holes of the safety angle 9 so that the surfaces in contact with the shock-absorbing elastic material 8 bonded to the surface of the convex portion 2b of the load support plate 2 can slide freely. Bolt hole 8 of guide plate 8
a. Insert into the bolt hole 1a of the elastic material 1, tighten the nut 12, and tighten the bolt 13 and nut 14 in the center to form an expansion joint device.

It should be noted that the load support plate referred to in the present invention is not limited to one consisting of each element shown in this embodiment, but of course includes a general load support plate.

The expansion joint configured in this manner has approximately the following effects.

That is, an upper groove and a lower groove in the shape of an elliptical column having a major axis in the longitudinal direction of the elastic material are formed on the front and back sides of the elastic material, separated by a waterproof membrane convex downward in the direction of movement, and the lower groove is formed narrower than the upper groove. However, by arranging the upper and lower grooves in the longitudinal direction of the elastic material, and by forming the waterproof membrane convexly below the cross section in the movement direction, the downward movement of the waterproof membrane is facilitated, and the lower groove is narrower than the upper groove. As a result, the base of the waterproof membrane becomes rigid, and as shown in Figure 5, the fourth
Since the side surfaces of the upper groove are pulled downward from the pre-compression state shown in the figure, even if the amount of expansion and contraction is large, even if the contraction is large, the central part can be prevented from lifting up, which will affect the running performance of the vehicle. This also prevented noise from rising.

Furthermore, since a large amount of expansion and contraction can be achieved with respect to the gap between opposing floor slabs, the notch at the end of the floor slab can be made smaller compared to a joint that has a small amount of expansion and contraction, which reduces construction costs. It has the advantage of being economical and requiring less construction time.

In addition, in completing this invention, we conducted experiments under the same conditions as in the case of the expansion joint according to this invention, even when the waterproof membrane made of elastic material was made flat and when the upper and lower grooves were made the same size. When the amount of expansion and contraction is large, especially when the contraction is large, the rubber deforms or bulges up, and this comparison confirms the merits of the expansion joint of this invention.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a cross-sectional view taken along line B-B in FIG.
The figures are a sectional view taken along the line A-A of the expansion joint in Fig. 1, Fig. 3 is a surface view, Fig. 4 is an enlarged view of the vicinity of the upper and lower grooves, and Fig. 5 is an enlarged view of the expansion joint during compression. □In the drawings, 1 is an elastic material, 2 is a load support plate, 3 is an upper groove, 4 is a lower groove, and 5 is a waterproof membrane.

Claims (1)

[Scope of utility model registration request] An upper groove and a lower groove in the shape of an elliptical column having a major axis in the longitudinal direction of the elastic material are formed on the front and back sides of the elastic material, separated by a waterproof membrane convex in the cross section in the direction of movement, and the lower groove is formed narrower than the upper groove. An expansion joint in which an upper groove and a lower groove are arranged at intervals in the longitudinal direction of an elastic material, and a load support plate is bonded to the back surface of the elastic material.