JPS5933728B2 - steel expansion joint - Google Patents

Description

[Detailed description of the invention] The present invention relates to a non-drained steel expansion joint.

In the conventional design structure, when the seal material is compressed, the only place it can escape is through the gap in the comb-shaped face plate at the top of the joint.
As the bridge expands and contracts due to temperature changes, the phenomenon of upward protrusion and depression occurs.

Furthermore, since the material of the sealing material is rubber-based, it cannot be said that the sealing material has good durability when under tension.

In order to keep the sealant in a compressed state at all times, it is necessary to fill the sealant with the gap in the expansion joint at least the maximum designed gap, but if you do this, the sealant will be filled with the gap at room temperature. This results in the protrusion phenomenon being further expanded.

In view of the above-mentioned current situation, the present invention provides a joint that prevents the protrusion of the sealing material and at the same time uses the sealing material itself in a constantly compressed state, in which a pair of joint elements are provided between each meshing part. are installed opposite each other with a distance greater than the design maximum spacing,
A back-up material is provided with an upward bend between the upper surfaces of the mounting members provided opposite to each web plate of each joint element, and includes the lower surfaces of both face plates, the opposing surfaces of both web plates, and substantially the back-up material. The space formed by the upper surface is filled with an elastic sealing material that is always in a compressed state, and the back-up material has a downward force against the compressive deformation force that is generated in the elastic sealing material when the two Ep plates approach each other due to thermal expansion. It is characterized in that the bending strength of the elastic sealing material is smaller than the resistance of the elastic sealing material to pass through the gap of the comb tooth-like meshing part.

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

1 and 1 are a pair of joint elements that are arranged opposite each other, and have face plates 3, 3 having comb-like meshing parts 2, 2 that are continuous in the road width direction as usual, and a base plate 4 that is parallel to these plates. 4 and a web plate 5.5 which integrates both plates 3, 3 and 4, 4.

Reference numeral 6.6 denotes a mounting member provided facing each of the web plates 5, 5, and a back-up material 7 is provided between the upper surfaces of these mounting members.

The material of this back-up material is not particularly limited, and includes foamed material,
Any suitable material such as stainless steel may be used.

This back-up material I also serves to prevent the member M from being damaged by the edges of the members 6, 6 when the elastic sealing material M, which will be described later, deforms and bulges into the downward space through the space between the mounting members 6, 6. Also accomplish.

Here, the elements 1 and 1 are brought relatively close to each other until the meshing portions 2 and 2 are spaced apart from each other at least the maximum design space of the expansion joint.

Then, since the backup material 7 itself does not expand or contract, the lower surface of the back-up material 7 is held down by the mounting members 6, 6, so it begins to bend upward, and a whitened portion 9 is formed.

Although it is preferable that the upper whitening portion 9 is arch-shaped, it may also be shaped in steps, such as a trapezoid, and this shape is not particularly limited either.

When both elements 1, 1 maintain a distance equal to or greater than the design maximum distance, the lower surfaces of both face plates 3, 3, the opposing surfaces of both web plates 5, 5, and the upper surface of buffer rough material 7, or this material becomes web plates 5, 5. If it has not reached this point, fill the space formed by the back-up material 7 and the upper surfaces of the mounting members 6, 6 with the elastic sealing material M.

Since both ends of the space are open, they are appropriately closed with a plate or the like to prevent the sealant M from leaking out.

In the above explanation, the upper white part 9 of the back-up material 7 is formed as the elements 1 and 1 are disposed oppositely, but if a back-up material with the upper white part formed in advance is used, the element 1, 1
The formation of white areas during the installation process is eliminated.

When the expansion joint is in service, these back-up materials 7 are compressed and deformed by the compressive deformation force generated in the elastic seal material M when the web plates 5, 5 approach each other due to thermal expansion. The resistance against the force that tries to push and bend the elastic sealing material M downward is the resistance that this elastic sealing material M receives when it tries to protrude outside through the gap between the comb-like meshing parts 2 and 2 due to this compressive deformation force. It is smaller than the force.

In the drawing, 21 is a gutter suspended between the mounting members 6, 6 via bolts 8.8, and 22, 22 are parapets of the bridge body or substructure.

The joints manufactured in this way are loaded onto the bridge body or substructure (parallel) 22.22, fixed as appropriate, concrete is poured behind it, and asphalt pavement is applied to the surface layer of this concrete. Same as before.

Here, when the bridge body 22 extends in the bridge axis direction due to thermal expansion, the web plates 5 approach each other, and the elastic sealing material M undergoes compression deformation.

This deformation occurs toward the space between the mounting members 6, 6 rather than the narrow gap between the engaging portions 2, 2 of the face plate 3, and does not protrude onto the bridge surface through the gap.

When the bridge bodies 22, 22 come closer together, the lower surface of the sealing material M pushes down the back-up material I and forms a straight line along the upper surface of the mounting members 6, 6, and when the bridge bodies 22, 22 come closer together, the lower surface of the sealing material M finally reaches the mounting member 6.
, and bulges downward through the space between 6 and 6.

At this time, since the back-up material 7 covers the lower surface of the sealing material M, there is no fear that the sealing material M will be damaged at the end surfaces of the mounting members 6, 6.

When the bridge body 22 returns to its original state due to thermal contraction, the sealing material M also returns to the illustrated state due to elastic deformation.

According to the present invention, a pair of joint elements are disposed opposite to each other with a distance equal to or greater than the design maximum interval between the respective meshing parts, and a back-up member is provided between the upper surfaces of the mounting members disposed opposite to each web plate of each joint element. The back-up material is installed with a white top part, and the space above it is filled with an elastic sealing material that is always in a compressed state.The back-up material forms an elastic sealing material when both web plates approach each other due to thermal expansion. The downward bending strength against the compressive deformation force generated in the material is smaller than the resistance of the elastic seal material to pass through the gap of the comb tooth-like meshing part, so the elastic seal material only constantly undergoes compressive deformation and does not undergo tensile deformation. This can guarantee the durability of the elastic sealing material, and the close contact with the bottom surface of the face plate completely prevents water leakage between the two, which also helps prevent collapse, and prevents the web plate from approaching due to thermal expansion of the bridge body. When the elastic sealing material deforms and expands,
This backup material can prevent this sealing material from being damaged at the edge of the mounting member, and also causes this compressive deformation to occur in the direction in which the backup material is pushed down, eliminating any protrusion onto the joint surface, thus eliminating this protruding portion. If this protruding part is worn out, and if this protruding part becomes a hindrance to vehicle running, conversely, when the bridge body heat-shrinks, a depression will form between the lower surface of the face plate and the upper surface of the sealing material, and this will become clogged with dust. It has various features such as being able to prevent it from becoming unable to expand or contract.

[Brief explanation of drawings]

The drawing is a perspective view showing an embodiment of the steel expansion joint according to the present invention. 1.1...Joint element, 2,2...Comb tooth-like meshing part,
3. Total: Face plate, 5, 5: Web plate, 6, 6: Mounting member, 7, 7': Backup material, 8, 8: Gutter mounting bolt, 9...・Upper listening section.

Claims (1)

[Claims] Eleven pairs of joint elements are arranged opposite each other with a distance equal to or greater than the design maximum interval between each meshing part, and the back-up material is bent upward between the upper surfaces of the mounting members provided facing each web plate of each joint element. The space formed by the lower surfaces of both face plates, the opposing surfaces of both wave plates, and substantially the upper surface of the back-up material is filled with an elastic sealing material that is always in a compressed state, and the back-up material is , the downward bending strength against the compressive deformation force generated in the elastic sealing material when the two web plates approach each other due to thermal expansion is smaller than the resistance of the elastic sealing material to pass through the gap in the comb-like meshing part. Characteristic steel expansion joint.