JPH0512321Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a reinforcing body formed into a sheet shape that allows the penetration of the cement bituminous mixture to form a buffer layer around concrete protrusions in railway slab tracks. This paper relates to a reinforcement structure around concrete protrusions in a slab track constructed with a layer of cement-bituminous mixture reinforced with carbon dioxide.

In slab tracks, in order to transmit the longitudinal and lateral loads of the track to the foundation, a notch, for example, a semicircular notch with a radius of approximately 250 mm, is provided at the center of both ends of the track slab, and a corresponding portion of the foundation (base course concrete ) to protrude concrete, e.g. radius
A cylindrical protrusion of about 200mm is provided. and,
A space is provided between the notch of the track slab and the concrete protrusion (hereinafter referred to as the protrusion), and this space is filled with asphalt emulsion, cement, sand, etc., similar to the filling space between the track slab and the roadbed concrete.
Cement-bituminous mixture (usually abbreviated as cement-asphalt mortar), which is a mixture consisting of water, admixtures, etc.
A buffer layer is provided by filling it with CA mortar. The hardened buffer layer of this cement bituminous mixture has moderate strength and elasticity, and
Absorbs and disperses vibrations, etc. Hereinafter, the cement bituminous mixture and its hardened product will be simply referred to as CA mortar.

Slab track has the advantage of being easy to construct and eliminating track maintenance work. However, when railways are located in cold regions, the low temperatures and snowfall in winter and the accompanying freezing and thawing effects are severe. There is a demand for more durable materials with greater resistance to cracking and cracking.

Additionally, as the years have passed since the slab track has been in service, the exposed parts of the CA mortar layer and the surrounding areas have become cracked, damaged, and weathered, which requires repair.

In particular, the CA mortar layer around the protrusion absorbs external forces acting on the protrusion, such as temperature loads (such as stress due to expansion and contraction of structures due to temperature changes), initial braking force, lateral pressure, and track lateral resistance force against buckling of long rails. Because of this, they are under considerable stress. In addition, because the surface is exposed, it is used under harsher conditions than the CA mortar layer under the track slab, and has physical properties that are better than the CA mortar layer under the track slab.
Durability is required.

This invention meets these demands.
By reinforcing the CA mortar layer around the protrusions with a sheet-shaped reinforcing body that allows CA mortar to penetrate, the present invention provides a reinforced structure around the protrusions that has significantly improved durability and usability.

The present invention involves inserting a reinforcing body formed into a sheet shape that allows CA mortar to penetrate into the filled space between the track slab and the protrusion of the slab track.
This is a reinforced structure around the protrusions filled with CA mortar, and is suitable not only for new installations but also for existing ones around the protrusions.
It is also applied when repairing CA mortar layer.

The present invention will be explained using figures. FIG. 1 is a longitudinal sectional side view showing an outline of the reinforcing structure around the protrusion according to an embodiment of the present invention, and FIGS. 2 and 3 are plan views of the reinforcing structure around the protrusion according to an embodiment of the present invention. , the method of inserting the reinforcing body formed into a sheet has been changed; Fig. 2 shows an example in which the reinforcing body formed into a sheet is inserted so as to be wrapped around a single-layer protrusion, and Fig. 3 shows an example in which the reinforcing body formed into a sheet is inserted so as to be wrapped around a single-layer protrusion. An example is shown in which two layers of molded reinforcing bodies are inserted so as to be wrapped around a protrusion with a spacer interposed therebetween. FIG. 4 is a diagram showing an outline of a conventional slab track.

In the figure, 1 is a base, for example, roadbed concrete. 2 is a concrete track slab (hereinafter referred to as track slab). 3 is a projection made of concrete and integrated with the base 1. 4 is a cement bituminous mixture layer (CA mortar layer), which is a hardened CA mortar filled in the space formed between the track slab 2 and the protrusion 3 (hereinafter referred to as the filled space around the protrusion). It is a layer. 5 is a reinforcing body formed into a sheet shape to allow penetration of CA mortar;
It is interposed within the mortar layer 4. Reference numeral 6 denotes a spacer, which is interposed in the CA mortar layer 4 together with the sheet-shaped reinforcing body 5. 7 is a rail.

As shown in Fig. 4, the conventional slab track structure has a CA mortar layer 4 as a buffer layer on the base 1.
A track slab 2 is provided between the two to create an integrated structure. In addition, a protrusion 3 is installed between the track slab 2 and the adjacent track slab 2, and a CA mortar layer 4 is also provided in the filled space around the protrusion formed between the track slab 2 and the protrusion 3. It is full of energy.

On the other hand, the reinforcing structure around the protrusions in the slab track of the present invention, as shown in Fig. 1, uses a reinforcing body 5 formed into a sheet shape that allows CA mortar to penetrate into the filled space around the protrusions. It is composed of a CA mortar layer 4 which is inserted and filled with CA mortar and hardened. In the figure, the sheet-shaped reinforcing body 5 is inserted to the depth of the filling space, that is, to the entire thickness of the track slab 2, but it can also be inserted partially. For example, reinforcement is achieved by inserting a sheet-shaped reinforcing body 5 at an appropriate depth from the surface that is likely to be damaged during service, for example, from the surface to 2/3 of the depth of the filling space. It can also have a structure.

The reinforcing body 5 formed into a sheet shape that allows penetration of CA mortar as used in the present invention is as follows. inorganic fibers (e.g. glass fibers),
Natural organic fibers, semi-synthetic fibers (e.g. rayon,
acetate, etc.), synthetic fibers (e.g. polyester, polyamide, polyimide, aromatic polyamide, polypropylene, polyethylene, vinylon,
(acrylic, polyvinyl chloride, polyvinylidene chloride, polyurethane, fluororesin, etc.), carbon fiber,
Metal fibers (e.g. steel, stainless steel, etc.)
Woven fabrics, knitted fabrics, reticulated fabrics made from fibers such as
Non-woven fabrics, mats (for example, felts, mats made by bonding a large number of fibers together with a binder or the like without weaving them and forming them into a sheet), etc.
In addition, nets made of metal wires, plastic wires, etc., nets made by combining these nets three-dimensionally, sheets of open-cell foamed plastic (e.g., urethane foam, etc.), sheets of paper, and plastic films. There are metal foils, sheets, metal foils, sheets, etc. with many holes.

The reinforcing body 5 formed into a sheet shape may have a roughened surface, an uneven surface, or
It can be bent into corrugated shapes, treated with chemicals, or processed with synthetic resin, bitumen, cement, etc.
It can also be used by treating it with cement asphalt, cement and rubber, etc.

In addition, these sheet-shaped reinforcing bodies 5
may be used alone, in combination, or in various combinations. For example, the sheet-shaped reinforcing body 5 may be used in one layer, or in multiple layers of two or more layers.
You can also use one piece by folding it into multiple layers.
Furthermore, these can also be used in combination.

The spacer 6, which is interposed in the CA mortar layer 4 together with the reinforcing body 5 formed into a sheet shape, arranges the reinforcing body 5 formed into a sheet shape at a predetermined position to facilitate the filling of CA mortar, and also makes it easier to fill the CA mortar layer. This is to increase the reinforcing effect of No. 4.

This spacer 6 may be a plate or column shaped as appropriate such as a circle, square, or polygon formed by CA mortar, or a reinforcing body 5 formed into a sheet shape that allows penetration of CA mortar, or a sheet of the same quality. Small pieces of appropriate shapes such as circles, squares, rectangles, polygons, and strips are used.

These spacers 6 may be attached in advance to predetermined positions of the sheet-shaped reinforcing body 5 by sewing or gluing. Furthermore, the reinforcement body 5
When molding into a sheet shape, it can also be constructed in one piece.

The CA mortar constituting the CA mortar layer 5 in the present invention is a cement-bituminous mixture made by mixing cement and bituminous emulsion with aggregate, admixtures, water, and the like. The materials used for these are as follows.

The bituminous emulsion is a mixture of one or more selected from petroleum asphalts such as straight asphalt, blown asphalt, semi-blown asphalt, and propane deasphalt asphalt, natural asphalts, tars, pitches, etc. Bituminous materials, or bituminous materials modified by adding and mixing rubber, synthetic polymers, etc. Emulsifying materials include surfactants, bentonite, etc. as the main emulsifying materials, and emulsifying them in water using appropriate emulsifying agents, dispersants, stabilizers, protective colloids, etc., as well as rubber latexes based on these bituminous emulsions. , a synthetic polymer emulsion, a synthetic resin emulsion, a water-soluble polymer, a water-soluble synthetic resin, etc. are added and mixed. Further, a mixture of a reactive water-soluble or emulsified epoxy resin and a reactive resin such as a curing agent thereof may also be used.

Furthermore, bituminous emulsions are broadly classified into anionic emulsions, cationic emulsions, nonionic emulsions, and clay-type emulsions based on the type of surfactant used as the main emulsifying material. Any type of bituminous emulsion for cement mixing can be used.

Bituminous emulsions are usually used with concentrations of evaporation residues of 55 to 70% by weight. Among bituminous emulsions,
Elastomers, reactive resins, or those containing both are superior in adhesion, bonding properties, durability, and the like. In addition, tar-based bituminous materials are more oil resistant than asphalt-based ones.
Excellent water resistance.

Cement includes Portland cement, fly ash cement, blast furnace cement, silica cement,
These include blast furnace colloidal cement, colloidal cement, jet cement, and alumina cement.

In addition to these cements, admixtures such as cement shrinkage compensators, hardening accelerators, hardening retarders, AE agents, dispersants, thickeners, water reducers, foaming agents,
Antifoaming agents etc. can be used together.

Although coarse aggregate such as gravel or crushed stone may be used in special cases, fine aggregate is usually used. The fine aggregate has a grain size of 2.5 mm or less and a coarse grain ratio of 1 to 2.5, preferably 1.2 to 2. Examples include river sand, sea sand, mountain sand, silica sand, sintered ash sand, iron sand, and foundry sand. In addition to the aggregate, fillers such as glass powder, silica sand powder, diatomaceous earth, mica powder, mica chips, bentonite, clay, stone powder, fly ash, anhydrous silica powder, pigments, carbon black, and graphite can be used. . These can also be used after being dispersed in water. Additionally, colloidal silica can also be used. Further, short fibers such as inorganic fibers, natural organic fibers, synthetic organic fibers, carbon fibers, metal fibers, and ceramic fibers can be mixed within the range that does not impair the filling properties of the CA mortar.

As water, fresh water is generally used. That is, tap water, industrial water, underground water, river water, etc. Water is used to adjust the workability of CA mortar.

CA mortar is made with the following mixing ratio, for example. Bituminous emulsion (converted to 60% by weight of evaporation residue) 0.1 to 5 parts, aggregate (as sand) 0 to 6 parts per 1 part by weight of cement (hereinafter simply referred to as parts)
It is usually used in a ratio of 0 to 2 parts. When using cement shrinkage compensators, hardening accelerators, etc.
Calculate by including the amount of cement in the above mixing ratio. Water is used as necessary, considering the workability of CA mortar. When using a blowing agent,
For example, when using aluminum powder, CA
It varies depending on the amount of bubbles introduced into the mortar, but
It is generally used in the range of 0.005 to 0.02% by weight of the amount of cement. If the amount of bituminous emulsion is less than 0.1 part per part of cement in the above-mentioned mixing ratio, the stiffness of the cured product will be strong, the elastic modulus and flexibility will be insufficient, and the waterproofness will also decrease. When the bituminous emulsion exceeds 5 parts, the strength decreases significantly. Further, when the amount of aggregate exceeds 6 parts of aggregate per 1 part of cement, workability such as filling properties of CA mortar decreases. Those that do not use aggregate have good filling properties, and have excellent freezing and melting resistance.

CA mortar is prepared by mixing each material in the above mixing ratio using an appropriate kneading machine, such as a concrete mixer, cement mortar mixer, grout mixer, soil mixer, pug mill mixer, mixer for CA mortar,
It can be obtained by mixing using other suitable mixers.

The reinforcement structure around the projecting concrete of this invention is
The reinforcing body 5 formed into a sheet shape is inserted into the filling space around the protrusion 3 to allow penetration of CA mortar, and then filled with CA mortar and hardened. can be inserted in various ways. For example, the second
As shown in the figure, the reinforcing body 5 formed into a sheet shape is attached to the protrusion 3.
The reinforcing body 5 formed into a sheet shape may be inserted so as to be wrapped in one layer around the protrusion 3, as shown in FIG. The reinforcing body 5 formed into a sheet shape may be inserted in a spiral manner around the protrusion 3, or the reinforcing body 5 formed into a sheet shape may be folded like a bellows and inserted so as to be wrapped around the protrusion 3. There is a way to do that.

In addition, as shown in FIG. 3, in order to insert the reinforcing body 5 formed into a sheet shape into a predetermined position of the charging space, the notched inner surface of the track slab 2 forming the charging space and the reinforcing body formed into a sheet shape are inserted. between the outer peripheral surface of the protrusion 3 forming the filling space and the sheet-shaped reinforcing body 5, and between the sheet-shaped reinforcing bodies 5, which are inserted in several layers. It is also possible to interpose spacers 6, 6, . . . at appropriate positions. When the thickness of the spacer 6 to be inserted is required, the spacer 6 can be used by stacking several layers, or the spacer 6 can be used by folding it.

When using the spacer 6, the reinforcing body 5 formed into a sheet shape can be inserted into a predetermined position, so that the desired uniform reinforcement effect can be obtained in each part, and the filling space can be filled with CA mortar, The CA mortar permeates through the reinforcing body 5 formed into the shape quickly, and filling work can be easily performed.

Further, the reinforcing body 5 formed into a sheet shape can be inserted either densely or sparsely into the filling space depending on its type, material, combination, etc.

When filling with CA mortar, bituminous emulsion, cement paste, rubber latex, polymer emulsion, a mixture thereof, or epoxy resin is applied to the parts of the track slab 2 that come in contact with the CA mortar, such as notches and protrusions 3. It is also possible to apply a prime coat such as Alternatively, the reinforcing body 5 formed into a sheet may be immersed in an aqueous cement dispersion, a bituminous emulsion diluted with water, or a mixture of both, and then placed in the filling section after draining the water. can.

In addition, when repairing the CA mortar layer 4 filled in the filling space around the existing protrusion 3, the portion of the conventional CA mortar layer 4 to be repaired is removed, and the base is prime-coated. After that, the reinforcing body 5 formed into a sheet shape is inserted, and then the CA mortar is filled and hardened. In this case as well, it is preferable to use the spacer 6 to insert the sheet-shaped reinforcing body 5 into the filling space. Moreover, the reinforcing body 5 formed into a sheet shape can be folded or rolled into multiple layers and inserted.

The reinforcing structure around the protrusions in the slab track of the present invention is configured as described above. Compared to CA mortar, strength (compression, bending,
It has excellent flexibility, impact resistance, freeze-thaw resistance, cracking resistance, weather resistance, etc. Furthermore, since it is reinforced by the sheet-shaped reinforcing body, it has an excellent effect of absorbing and dispersing stresses such as loads, shocks, and vibrations, and alleviating them. Therefore,
The reinforced CA mortar layer around the protrusions of the present invention has significantly improved durability and usability compared to the conventional CA mortar layer around the protrusions.

(2) When using a spacer, the reinforcing body formed into a sheet shape can be inserted into a predetermined position, so the desired uniform reinforcement effect can be obtained in each part, and the filling space can be filled with CA mortar and the sheet against the reinforcement formed in the shape of
CA mortar penetrates quickly, making filling work easy.

(3) The reinforcing body formed into a sheet shape and furthermore the spacer can be produced in advance in a factory, and construction is easy, and the reinforcing structure of the present invention can be created whether it is a new installation or a repair. I can do it.

(4) Type and amount of reinforcing material formed into a sheet,
The physical properties of the reinforced CA mortar layer can be controlled by how it is used.

(5) It is economical because durability and usability are significantly improved, and maintenance time is longer.

It has excellent practical benefits such as.

[Brief explanation of the drawing]

Fig. 1 is a vertical side view showing an outline of a reinforcing structure around a protrusion according to an embodiment of the present invention, and Figs. 2 and 3 are plan views of a reinforcing structure around a protrusion according to an embodiment of the present invention. be. FIG. 4 is a plan view showing an outline of a conventional slab track. In the figure, 1 is a base, 2 is a track slab, 3 is a projection, 4 is a cement bituminous mixture layer (CA mortar layer), 5 is a reinforcing body formed into a sheet shape, 6 is a spacer, and 7 is a rail.

Claims (1)

[Scope of utility model registration request] In the filling space around the protrusion formed between the track slab and the protruding concrete in the slab track, a reinforcing body formed into a sheet that allows the penetration of the cement bituminous mixture is inserted, and the cement bituminous mixture is also filled. A reinforced structure around protruding concrete in a slab track characterized by a reinforced concrete structure.