JPH0431287Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is characterized in that cement bituminous material is added to the inner side of the periphery where stress is concentrated in the cement bituminous mixture layer, which is provided as a buffer layer in the filled space formed between the upper and lower parts of the foundation and the track slab. This invention relates to a reinforcement structure for the peripheral edge of a cement-bituminous mixture layer in a slab track, which is strengthened by interposing a plurality of sheet-shaped reinforcement layers to allow penetration of the mixture.

In a slab track, a cement-bituminous mixture (usually cement-asphalt mortar, abbreviated as CA), which is a mixture of asphalt emulsion, cement, sand, water, admixtures, etc. (It's called mortar)
A buffer layer is provided by filling it with The hardened buffer layer of this cement bituminous mixture has appropriate strength and elasticity, and serves as a buffer layer that absorbs and disperses load shock, vibration, 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.

In addition, as the years have passed since the slab track was put into service, the CA mortar layer, especially around its periphery, has become cracked, chipped, and weathered.
This repair is needed.

The present invention meets these needs and provides a reinforcing structure at the periphery of the CA mortar layer under the track slab that is suitable not only for new construction but also for repair.

In addition, the present invention has multiple layers of reinforcing bodies formed in a sheet shape that allow CA mortar to penetrate inside the peripheral edge of the CA mortar layer provided in the filled space formed between the top and bottom of the base and the track slab. The gist of this paper is a reinforcement structure for the peripheral edge of the CA mortar layer in the slab track, which is characterized by the presence of an intervening structure.

Next, the reinforcing structure of the peripheral edge of the CA mortar layer in the slab track of the present invention will be explained using illustrated examples.

In the figure, reference numeral 1 indicates a base, for example roadbed concrete. Reference numeral 2 is the track slab, which is usually made of concrete and is connected to the base 1.
A large number of them are arranged on the top surface. Code 3 is the CA mortar layer (cement bituminous mixture layer), which is the base 1
This is a hardened layer of CA mortar filled in the filled space formed between the top and bottom of the track slab 2 and the track slab 2.

The CA mortar constituting the CA mortar layer 3 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.

Bituminous milk is a mixture of one or more selected from petroleum asphalts such as straight asphalt, blown asphalt, semi-blown asphalt, and propane deasphalt, natural asphalts, tars, pitches, etc. Bituminous materials, or bituminous materials modified by adding and mixing rubber, synthetic polymers, etc. to these bituminous materials, can be treated with anionic surfactants, cationic surfactants, nonionic surfactants, 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 terms of adhesion, bonding properties, and durability. In addition, tar-based bituminous materials have better oil and water resistance than asphalt-based materials.

Cement includes Portland cement, fly ash cement, blast furnace cement, silica cement, blast furnace colloid cement, colloid cement,
These include 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 reducing agents, 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 aggregate, glass powder, silica sand powder, diatomaceous earth, mica powder,
Fillers such as mica chips, bentonite, clay, stone powder, fly ash, silica powder, pigments, carbon black, graphite, etc. 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, and carbon 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. 0.1 to 5 parts of bituminous emulsion (converted to 60% by weight of evaporation residue), 0 to 6 parts of aggregate (as sand), per 1 part by weight of cement (hereinafter simply referred to as parts);
It is usually used in a proportion of 0 to 2 parts. When using cement shrinkage compensators, hardening accelerators, etc., include them in the amount of cement in the above mixing ratio. Water is used as necessary, considering the workability of CA mortar. When using foaming agents, for example when using aluminum powder,
Although it varies depending on the amount of bubbles introduced into the CA mortar, it is generally used in the range of 0.005 to 0.02% by weight of the amount of cement. At the above mixing ratio, cement amount 1
When the amount of bituminous emulsion is less than 0.1 part per part,
The rigidity of the cured product is strong, the elastic modulus and flexibility are insufficient, and the waterproofness is also reduced. Bituminous emulsion is 5
When it exceeds 100 mm, 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.

In addition, the reference numeral 4 in the figure is a reinforcing body formed in a sheet shape to allow penetration of CA mortar, and the CA mortar layer 3 filled in the filled space.
It is located inside the peripheral edge of and is interposed in multiple layers. The periphery of the CA mortar layer 3 is strengthened by including a plurality of layers of sheet-shaped reinforcing bodies 4 that allow penetration of the CA mortar.

The reinforcing body 4 formed in a sheet shape and capable of penetrating 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.
Also, nets made of metal wires, plastic wires, etc., nets made by combining these nets three-dimensionally, sheets of open-cell foamed plastic (e.g. foamed polyurethane), sheets of paper, plastic films and sheets. There are also metal foils, sheets, etc. with many holes.

These sheet-shaped reinforcing bodies 4 may be processed to have a rough 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, when providing multiple layers of these sheet-shaped reinforcing bodies 4, it is also possible to use only the same type of sheet-shaped reinforcing bodies 4, 4...
Reinforcing bodies 4, 4 formed into different types of sheets...
... can be used in combination, or various types of reinforcing bodies 4, 4, etc. formed into sheet shapes can be used in combination.

Furthermore, these sheet-shaped reinforcing bodies 4
When molding into multiple layers, two layers of reinforcing bodies 4, 4, etc. molded into several sheets (Fig. 1),
It is possible to form a plurality of layers by placing them in parallel, such as three layers (FIG. 2). Furthermore, the reinforcing body 4 formed into a single sheet can be folded in half and placed in parallel to form two layers. In this case, the folded part of the reinforcing body 4 formed into a sheet shape is installed so as to be located on the outside of the periphery of the CA mortar layer 3 (Fig. 3), and the folded part is placed on the inside of the periphery of the CA mortar layer 3. In some cases, it is installed so that the Furthermore, in this case, by inserting another reinforcing body 4 formed into four shapes between the folded and parallel parts, three layers can be easily formed (Figs. 5 and 6). be able to. Further, the reinforcing body 4 formed into a single sheet can be sequentially folded in a bellows shape and placed in parallel to form three layers (FIG. 7) or four layers.
Even in this case, the installation position within the CA mortar layer 3 of the folded portion of the sheet-shaped reinforcing body 4 can be freely determined. Furthermore, the reinforcing body 4 formed into a single sheet can be wound to form a plurality of appropriately shaped layers (FIGS. 8 and 9).

Further, the sheet-shaped reinforcing body 4 provided in a plurality of layers can be inserted into the filling space either densely or sparsely.

Further, the reference numeral 6 in the figure is a spacer, which is the CA mortar layer 3 filled in the filled space.
By interposing it together with the reinforcing body 4 formed in a sheet shape provided in multiple layers on the peripheral edge of the
Reinforcement body 4 formed in a sheet shape provided in multiple layers
This is to maintain the installation position well to facilitate filling with CA mortar, and to further increase the reinforcing effect of the CA mortar layer 3.

This spacer 6 is a plate of an appropriate shape such as a circle, square, or polygon formed by CA mortar.
Used are columns, reinforcing bodies 4 formed into sheets that allow penetration of CA mortar, or small pieces of a suitable shape such as circular, square, rectangular, polygonal, or band-shaped by cutting a homogeneous sheet.

The spacers 6 are installed between the upper surface of the base 1 and the sheet-shaped reinforcement 4, between the back surface of the track slab 2 and the sheet-shaped reinforcement 4, and between the sheet-shaped reinforcement 4. It is preferable to install the reinforcing body 4 in the form of a sheet, which is laminated on the reinforcing body 4, and in all the gaps between them. It may be installed by selecting any gap.

These spacers 6 may be attached in advance to predetermined positions of the sheet-shaped reinforcing body 4 by sewing or gluing. Furthermore, when molding the reinforcing body 4 into a sheet shape, it can also be constructed integrally.

When using the spacer 6, the reinforcing body 4 formed into a sheet shape can be inserted into a predetermined position, so that the desired uniform reinforcement effect can be obtained at each part, and the filling space can be filled with CA mortar. For the reinforcement body 4 formed into
CA mortar penetrates quickly, making filling work easy.

When filling CA mortar, base 1
It is also possible to apply a prime coat of bituminous emulsion, cement paste, rubber latex, polymer emulsion, a mixture thereof, or epoxy resin to the areas in contact with the CA mortar such as the track slab 2 and the track slab 2. In addition, the reinforcing body 4 and spacer 6 formed into a sheet shape are
It is also possible to soak it in an aqueous cement dispersion, a bituminous emulsion diluted with water, or a mixture of the two, drain the water, and then place it in the filling section.

In addition, when repairing the peripheral edge of the existing CA mortar layer 3, the part to be repaired of the conventional CA mortar layer 3 is removed, a brim coat is applied to the base, and the reinforcing layer is formed into a sheet. The body 4 is inserted in multiple layers, and then the CA mortar is filled and hardened.

In this case as well, it is convenient to use the spacer 6 to insert the reinforcing body 4 formed into a sheet into the filling space to provide a plurality of layers of the reinforcing body 4. In this case, the work can be facilitated by using a sheet-shaped reinforcing body 4 that is folded or rolled into multiple layers.

The reinforcing structure of the peripheral edge of the CA mortar layer in the slab track of the present invention is constructed as described above. (1) The peripheral edge of the CA mortar layer reinforced with sheet-shaped reinforcing bodies is Compared to CA mortar, which does not include reinforced reinforcement, it has greater strength (compression, bending, shear, etc.) and flexibility, and is extremely superior in terms of impact resistance, resistance to freezing and thawing, 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. As a result, severe damage such as cracks can occur.
The periphery of the CA mortar layer has significantly improved durability and usability compared to the periphery of the conventional CA mortar layer.

In particular, since the reinforcing body formed into a sheet shape is provided in multiple layers, these effects are remarkable.

(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 CA mortar permeates through the shaped reinforcement body quickly, making filling work easy.

(3) Reinforcing bodies formed into sheet shapes and even spacers can be produced in advance at a factory;
Construction is easy, and the reinforcing structure of the present invention can be constructed for both new construction and repair.

(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 drawings]

The figures show embodiments of the present invention, with Fig. 1 being a longitudinal sectional front view showing the reinforcing body installed in two layers with reinforcing bodies molded into two sheet shapes, and Fig. 2 being a reinforcing body. Vertical front view showing the state in which the body is installed in three layers by reinforcing bodies formed into three sheet shapes, 3rd
Figures 4 and 4 are longitudinal sectional front views of main parts showing a reinforcing body formed into a single sheet, which is folded in half and installed in two layers.
Both Figures 6 and 6 are longitudinal sectional front views of the main parts showing the reinforcing bodies installed in three layers with the reinforcing bodies molded into two sheets, and Figure 7 shows the reinforcing bodies formed into one sheet. 3. Fold the reinforcing body formed into a bellows shape one after another.
Vertical front view of the main part showing the state installed in the layer, No. 8
9 and 9 are longitudinal sectional front views of main parts showing a state in which the reinforcing body is formed into a single sheet and is installed in a plurality of layers in a rolled-up manner. In the figure, 1 is the base, 2 is the track slab, 3 is the cement bituminous mixture layer (CA mortar layer), 4 is the reinforcement formed into a sheet, 5 is the through hole, 6 is the spacer, and 7 is the rail. .

Claims (1)

[Scope of utility model registration request] Multiple layers of reinforcing bodies formed in a sheet shape are interposed inside the peripheral edge of the cement-bituminous mixture layer provided in the filling space formed between the top and bottom of the base and the track slab to allow penetration of the cement-bituminous mixture. This is a reinforcement structure for the periphery of the cement bituminous mixture layer in the slab track.