JP2006183336A - Floor structure of footbridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a floor structure of a footbridge superior in a walking feeling, and beautiful in an appearance, by preventing the deterioration of a floor skeleton due to permeation of rainwater. <P>SOLUTION: A floor slab 2 composed of a precast concrete plate is arranged on the floor skeleton 1, and a drainage slope layer 3 is formed on this floor slab. A backing adjusting layer 4 is arranged on this drainage slope layer 3, and a waterproof layer 5 is arranged on this layer. The waterproof layer 5 is formed by hardening by applying a waterproof agent composed of a polyurea resin. Modified isocyanate and special modified polyether amine are separately sent into a spray gun in a heating state, and these two components are mixed in the spray gun to be sprayed. A water permeable layer 6 is arranged on the waterproof layer 5. The water permeable layer 6 is formed by joining particles such as a small stone, a wooden piece, a synthetic resin and rubber by an adhesive. A fine water permeable hole is formed between the particles, and the rainwater flows to the waterproof layer 5 by passing through this water permeable hole. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a floor structure of a pedestrian bridge, and prevents the penetration of rainwater from the floor so that a floor having a good appearance can be obtained.

  As a floor structure of a footbridge, for example, a precast concrete board is placed on a steel frame and a waterproof mortar is placed on it, or a precast concrete board is provided with asphalt pavement. Many.

However, with this floor structure, the waterproof mortar and asphalt pavement cracks in a relatively short period of time, rainwater penetrates into the interior, travels from the joints of the precast concrete board to the floor frame, and corrodes the steel frames that make up the floor frame. It often happened to be degraded.
Moreover, since a pedestrian walks on the waterproof mortar with a hard surface or a pavement surface, there also existed a problem that a feeling of walking was not good, and also it could not be said that the external appearance was also beautiful.

The following documents are related to the floor structure of pedestrian bridges.
Edited and published by the Japan Road Association “Technical Standards for Crossing Facilities / Comments”, pages 57-58, January 1979

  Accordingly, an object of the present invention is to obtain a floor structure of a pedestrian bridge that can prevent rainwater from penetrating and deteriorate the floor frame, has an excellent walking feeling, and has a beautiful appearance.

To solve this problem,
The invention according to claim 1 is a floor structure of a pedestrian bridge, wherein a water gradient layer, a waterproof layer, and a water permeable layer are sequentially laminated on the floor concrete of the pedestrian bridge, and the waterproof layer is made of polyurea resin. .
The invention according to claim 2 is the floor structure of the pedestrian bridge, wherein a waterproof layer and a water permeable layer are sequentially laminated on the floor concrete of the pedestrian bridge, and the waterproof layer is made of polyurea resin.

The invention according to claim 3 is the floor structure of the pedestrian bridge according to claim 1 or 2, wherein the polyurea resin is a two-component mixed thermosetting type.
The invention according to claim 4 is characterized in that the water permeable layer is formed by bonding particles of synthetic resin or rubber to each other, and a plurality of water permeable holes are formed. The floor structure of the pedestrian bridge described.

The invention according to claim 5 is the floor structure of the pedestrian bridge according to claim 1 or claim, wherein the water-permeable layer is colored or patterned.
The invention according to claim 6 is the floor structure of the pedestrian bridge according to claim 1, wherein the surface of the water-permeable layer is a substantially horizontal flat surface.
The invention according to claim 7 is the floor structure of the pedestrian bridge according to claim 1, wherein the gradient of the water gradient layer is one or both flows.
In the invention according to claim 8, the material for forming the water permeable layer is a recycled material, and the floor structure of the pedestrian bridge according to claim 1.

  According to the floor structure of the present invention, since the waterproof layer is made of polyurea resin, the floor frame has a large deformation or the like, exhibits a complete waterproof performance over a long period of time, and deteriorates the floor frame by rainwater such as acid rain. There is no. In addition, since the floor surface is finished with a water-permeable layer, the feeling of walking is good, there is little injury even if it falls, and safety is high.

Moreover, since rainwater is drained quickly, there is no puddle, and walking is good. Further, if a water-permeable layer that is colored or patterned is used, the appearance is also beautiful. Furthermore, construction is easy and the construction period is short.
Moreover, if the surface of the water-permeable layer is made almost horizontal, the walking surface will not be inclined, and walking will be easy, and it will be easy for the physically handicapped and the elderly.

FIG. 1 schematically shows an example of the floor structure of the present invention, and reference numeral 1 in the figure indicates a floor frame.
The floor frame 1 has a truss shape that is assembled by joining steel frames such as H-shaped steel by welding, bolting, or the like.
On the floor frame 1, a floor slab 2 made of a precast concrete plate and having a thickness of 50 to 100 mm is disposed and fixed to the floor frame 1 by bolting or the like.

A water gradient layer 3 is formed on the floor slab 2. This water gradient layer 3 is for forming a drainage gradient of the entire floor. In this example, a gradient of about 2 to 5/100 of the gradient descending toward one side end of the pedestrian bridge is provided. ing. The water gradient layer 3 is constructed by a method in which normal cement mortar, concrete, asphalt concrete (ascone), resin mortar, etc. is spread with a gold iron, and the thickness is increased in the water part and thinned in the water part. However, this range is not limited.
Further, cast water drainage drains (not shown) are attached to several places in the underwater portion of the water gradient layer 3.

On the water gradient layer 3, a base adjustment layer 4 is provided. The base adjustment layer 4 fills up pinholes generated in the water gradient layer 3 and functions as a primer for the waterproof layer 5 applied on the layer 4.
The base adjustment layer 4 is formed by applying an epoxy resin solventless putty or the like to the water gradient mortar layer 3 using a rubber iron, a gold iron, a roll brush, or the like.
Specifically, as the epoxy resin-based solvent-free putty, a trade name “AI-7515L” manufactured by Specialty Product Inc., USA is preferable. The thickness of the base adjustment layer 4 is about 0.1 to 0.5 mm.
The base adjustment layer 4 can be omitted depending on circumstances. That is, if the surface state of the water gradient mortar layer 3 is smooth, has no pinholes, and can form the waterproof layer 5 directly, it can be dispensed with.

Further, a waterproof layer 5 is provided on the base adjustment layer 4. It is intended to prevent rainwater from penetrating and flush rainwater into the drain. The waterproof layer 5 is formed by applying and curing a waterproofing agent made of a polyurea resin.
The polyurea resin is composed of two components of a modified isocyanate and a specially modified polyetheramine. These two components are mixed and instantaneously subjected to a chemical reaction and cured.
Specific examples of the waterproofing agent comprising the polyurea resin include a product name “Polyshield” manufactured by Specialty Product Inc., USA.

  In this waterproofing agent, after mixing the above-mentioned two components, it is fast-curing that cures in 2 to 60 seconds, there is no curing failure due to humidity, and there are no water droplets on the surface even with a lot of moisture. Can be applied. Moreover, the mechanical strength and elongation of the obtained resin film are high, the movement of the floor frame 1 can be followed, and the adhesion to the construction surface is also high. Furthermore, it exhibits high durability against chemicals such as acid, alkali, ozone, and chlorine, is solventless, and is safe because it does not expose workers to organic solvent vapor during spraying.

The waterproofing agent is applied by separately feeding the modified isocyanate and the specially modified polyetheramine separately to the spray gun in a heated state, mixing the two components in the spray gun, and spraying immediately.
The thickness of the waterproof layer 5 thus formed is not particularly limited, but is usually about 1 to 5 mm.
The waterproof layer 5 is formed up to the ridge portion of the drainage drain, and rainwater that has flowed onto the waterproof layer 5 flows to the drainage drain and is drained therefrom.

Further, a water permeable layer 6 is disposed on the waterproof layer 5 and is fixed to the waterproof layer 5 with an adhesive.
This water permeable layer 6 is made of elastic particles such as pebbles, wood chips, urethane resin, thermoplastic elastomer, natural rubber, nitrile rubber, acrylic rubber, styrene / butadiene rubber, chloroprene rubber, ethylene / propylene rubber, etc. Particles having a diameter of about 0.3 to 5 mm are roughly bonded to each other with an adhesive such as an epoxy resin adhesive, and fine water-permeable holes are formed between the particles. Rainwater flows through the waterproof layer 5 through the water.

The water permeable layer 6 may be formed at a construction site, or may be previously processed into a mat or roll at a factory, brought into the construction site, and pasted on the waterproof layer 5. .
When the water permeable layer 6 is formed at the construction site, an uncured adhesive liquid is mixed with the particles, the adhesive liquid is applied to the particle surface, and this is spread on the waterproof layer 5 with a gold iron or the like. In this case, the surface of the water-permeable layer 6 may be a horizontal flat surface or may be finished as an inclined surface along the water gradient of the foundation.
In addition, the material constituting the water permeable layer 6 may be a recycled material collected after use, and recycled synthetic resin and rubber can be reused. According to this, ecology is achieved.

  In addition, when a mat or roll processed in advance at a factory is brought into the construction site and used, it is spread on the waterproof layer 5 and bonded to the waterproof layer 5 with an epoxy resin. It is pasted using an adhesive such as an adhesive.

As the particles made of the above-mentioned various materials constituting the water permeable layer 6, particles having one or more color tones can be used, whereby the colorful water permeable layer 6 can be obtained, and the design is improved. .
Alternatively, a plurality of types of mat-like particles in which particles of a single color tone are combined may be produced by changing the color tone, and a plurality of those having different color tones may be arranged in combination to form a pattern as a whole. Moreover, you may paint.

  In addition, the code | symbol 7 in FIG. 1 shows the railing of a footbridge.

In such a floor structure of a pedestrian bridge, since the walking surface is composed of the water permeable layer 6, rainwater due to rain does not stay on the surface, but quickly passes through the water permeable hole to the waterproof layer 5. No puddle on the surface.
Moreover, when the thing which gave the color tone and the pattern to the water-permeable layer 6 is used, an external appearance becomes beautiful.

  Furthermore, when particles made of synthetic resin or rubber are used as the particles forming the water permeable layer 6, the feeling of walking is elastic and good, and in the event of a fall, there is no serious injury. High safety.

  Further, since a waterproofing agent made of a polyurea resin is applied to the waterproof layer 5, the waterproof layer 5 has high durability, and further stretches and has a high tensile strength. Even if cracks or the like occur in the floor slab 2 due to repeated shrinkage, this movement follows well, the waterproof layer 5 does not break, and the waterproof performance is maintained for a long time.

For this reason, rainwater does not corrode and deteriorate the underlying floor slab 2 or the floor frame 1 through the waterproof layer 5. For this reason, the floor slab 2 and the floor frame 1 are not damaged by salt damage or acid rain.
For this reason, compared with the conventional floor structure, the lifetime of the pedestrian bridge itself can be extended.

  Moreover, if the surface of the water permeable layer 6 is a horizontal flat surface, the walking surface will not be inclined, it will be easy to walk, and it will be gentle for the elderly and the handicapped.

  Moreover, in the floor structure of this invention, the floor slab 2 arrange | positioned on the floor frame 1 can also be inclined, and it can also attach to the floor frame 1, and, thereby, a drainage gradient can be formed in the floor slab 2 itself. For this reason, the water gradient layer 3 can be made unnecessary, thereby shortening the construction time and reducing both the material cost and the construction cost.

  Furthermore, in the above-described embodiment, the gradient of the water gradient layer 3 is a single flow. However, the present invention is not limited to this, and it is also possible to form a double flow in which the central portion of the water gradient layer 3 is on the water and both end portions are under the water.

  Furthermore, the floor structure of the present invention can be applied not only to a flat sidewalk part of a pedestrian bridge, but also to a staircase part attached to the sidewalk part and a landing of a staircase part.

It is a schematic sectional drawing explaining an example of the floor structure of the footbridge of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Floor frame, 2 ... Floor slab, 3 ... Water gradient layer, 4 ... Base adjustment layer, 5 ... Waterproofing layer, 6 ... Water-permeable layer.

Claims (8)

  A floor structure of a pedestrian bridge, wherein a water gradient layer, a waterproof layer, and a water permeable layer are sequentially laminated on the floor slab of the pedestrian bridge, and the waterproof layer is made of polyurea resin.   A floor structure of a pedestrian bridge, wherein a waterproof layer and a water-permeable layer are sequentially laminated on a floor slab of the pedestrian bridge, and the waterproof layer is made of polyurea resin.   The floor structure of a footbridge according to claim 1 or 2, wherein the polyurea resin is a two-component mixed thermosetting type.   The permeable bridge according to claim 1 or 2, wherein the water permeable layer is formed by bonding pebbles, wood pieces, synthetic resin particles or rubber particles to each other, and a plurality of water permeable holes are formed. Floor structure.   The floor structure of a footbridge according to claim 1 or 2, wherein the water-permeable layer is colored or patterned.   The floor structure of the footbridge according to claim 1, wherein the surface of the water permeable layer is a substantially horizontal flat surface.   The floor structure of a pedestrian bridge according to claim 1, wherein the gradient of the water gradient layer is a single flow or a double flow. The floor structure of a footbridge according to claim 1, wherein the material forming the water permeable layer is a recycled material.

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