JPH0415770Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is designed to form a sheet-like structure by allowing the cement-bituminous mixture to penetrate into the cement-bituminous mixture layer, which is filled in the filling space formed between the top and bottom of the base and the track slab. The present invention relates to a reinforcement structure for a cement-bituminous mixture layer in a slab track reinforced by reinforcement bodies formed in the above-mentioned manner.

In a slab track, a cement bitumen mixture consisting of asphalt emulsion, cement, sand, water, admixtures, etc. is added to the filled space (hereinafter simply referred to as the filled space) formed between the upper and lower parts of the foundation and the track slab. A buffer layer is provided by filling it with a mixture (usually called cement asphalt mortar, or CA mortar for short). 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, so CA mortar, which is conventionally used in warm regions, is more susceptible to freezing and thawing.
There is a demand for more durable materials with greater resistance to melting, impact resistance, and cracking resistance.

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.

The present invention meets these needs by providing a CA mortar layer reinforced with sheet-shaped reinforcing bodies that allows CA mortar to penetrate into the filling space, thereby reducing expansion and contraction. Reinforcement structure of CA mortar layer in slab track with outstanding bending strength, shear strength, impact strength, cracking resistance, fatigue resistance, freezing resistance, melting resistance, waterproofing, corrosion resistance, weather resistance, durability, etc. It provides:

Another purpose of the present invention is to provide a CA mortar layer reinforced with a sheet-shaped reinforcing body that allows CA mortar to penetrate into the filled space, thereby reducing loads, shocks, vibrations, etc. This provides a reinforcement structure for the CA mortar layer in the slab track that can absorb, disperse, and alleviate stress.

Furthermore, the purpose of the present invention is to interpose a reinforcing body and a spacer formed into a sheet shape to enable penetration of the CA mortar into the CA mortar filled in the filling space. The installation position of the reinforcing body formed in the shape is well maintained,
The purpose of the present invention is to provide a reinforcement structure for a CA mortar layer in a slab track that can facilitate filling with CA mortar and increase the reinforcing effect of the CA mortar layer.

That is, the present invention allows CA mortar to penetrate into the CA mortar layer provided in the filled space formed between the top and bottom of the base and the track slab, and uses a reinforcing body formed into a sheet shape with a spacer interposed therebetween. CA in a slab track characterized by the arrangement of
The gist of this is a reinforcement structure for the mortar layer.

Next, the reinforcing structure 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 CA mortar layer filled in the filled space formed between 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.

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, 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 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 aggregate, we also produce glass powder, silica sand powder, diatomaceous earth, mica powder, mica pieces, bentonite, clay, stone powder, fly ash, silica anhydride powder, pigments, carbon black,
A filler such as 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, 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.
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,
It varies depending on the amount of air bubbles introduced into the CA mortar, but generally 0.005 to 0.02% by weight of the cement amount.
used within the range. 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.

In addition, the reference numeral 4 in the figure is a reinforcing body formed into a sheet shape to allow penetration of CA mortar, and the CA mortar layer 3 filled in the filled space is
This is for reinforcing the CA mortar layer 3 by interposing it within the CA mortar layer 3. This reinforcing body 4 formed into a sheet shape
The position in the CA mortar layer 3 where the
As shown in FIG. 2, it can be positioned entirely opposite the lower surface of the track slab 2, or it can be positioned partially against the lower surface of the track slab 2, as shown in FIG. . Further, the number of reinforcing bodies 4 formed in a sheet shape may be interposed in one layer or in multiple layers, and when the reinforcing bodies 4 formed in a sheet shape are interposed in a plurality of layers, as shown in Even if a plurality of reinforcing bodies 4, 4... formed in the form of sheets are provided in a stacked manner as shown in Fig. 2, the reinforcing bodies 4 formed in the form of one continuous sheet can be They can also be provided in a laminated manner by folding them in a shape such as a letter or an S letter.

The reinforcing body 4 formed into 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, aromatic polyamide, polypropylene, polyethylene, vinylon, acrylic, polyvinyl chloride, polyvinylidene chloride, polyurethane, fluororesin, etc.), carbon fibers, metal fibers (e.g., steel, Woven fabrics, knitted fabrics, reticulated fabrics, non-woven fabrics, mats (e.g., felts) made from fibers such as stainless steel, etc. (e.g. felt, mats made by bonding a large number of fibers appropriately with a binder etc. and forming them into a sheet shape without weaving them) etc.). Also, metal wire,
Nets made of plastic wire, nets made by combining these nets three-dimensionally, sheets of open-cell foamed plastic (e.g. foamed urethane, etc.), paper sheets, plastic films and sheets, metal There are 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 a corrugated shape, or the surface can be treated with chemicals, synthetic resin, bituminous material, cement, cement asphalt, cement and rubber, etc.

In addition, these sheet-shaped reinforcing bodies 4
may be used alone, in combination, or in various combinations. For example, the reinforcing body 4 formed into a sheet shape can be used in one layer, or in multiple layers of two or more layers.
A single sheet can be folded to form multiple layers, or a combination of these can be used.

Further, reference numeral 5 in the figure is a spacer, which is interposed together with a sheet-shaped reinforcement 4 in the CA mortar 3 filled in the filling space, so that the sheet-shaped reinforcement 4 can be installed. It is possible to hold the position well, facilitate filling with CA mortar, and increase the reinforcing effect of the CA mortar layer 3. The spacer 5 is formed by cutting the sheet-shaped reinforcing body 4 or a similar material into squares, rectangles, strips, etc., and may be used by folding it in two as shown in FIG. 4 if necessary. Furthermore, as the spacer 5, one made of CA mortar as a plate-shaped, column-shaped, etc. strip can also be used. This spacer 5 is the fifth
As shown in the figure, they are installed at appropriate intervals, for example, at intervals of 25 to 30 cm. The position to install spacer 5 is
Formed in a sheet shape to be laminated between the upper surface of the base 1 and the reinforcing body 4 formed in a sheet shape, between the back surface of the track slab 2 and the reinforcing body 4 formed in a sheet shape, and on the reinforcing body 4 formed in a sheet shape. It is preferable to install the reinforcing body 4 between all of them. You may select and install one of the two spaces. In addition, these spacers 5, 5... are fixed in advance by sewing, gluing, etc. to the installation position of the reinforcing body 4 formed into a sheet shape, and furthermore, when forming the reinforcing body 4 into a sheet shape, , if it is configured as one piece, construction becomes easier.

In order to construct the CA mortar layer of this invention, CA
When filling with mortar, apply a prime such as bituminous emulsion, cement paste, rubber latex, polymer emulsion, or a mixture thereof, or epoxy resin to the areas in contact with the CA mortar, such as the back surface of the base 1 and track slab 2. It can also be coated. In addition, a reinforcing body 4 formed in a sheet shape and a spacer 5 are also provided.
It is also possible to soak it in an aqueous cement dispersion, a bituminous emulsion diluted with water, or a mixture of both, drain the water, and then place it in the filling section. Also,
A light vibration can also be applied to the filling of CA mortar.

The reinforcing structure of the CA mortar layer in the slab track according to the present invention is constructed as described above. Because it has a reinforced CA mortar layer,
CA in slab track with little expansion/shrinkage and excellent bending strength, shear strength, impact strength, cracking resistance, fatigue resistance, freezing resistance, melting resistance, waterproofing, corrosion resistance, weather resistance, durability, etc. A reinforced structure of the mortar layer is obtained.

(2) The present invention provides a CA mortar layer reinforced with sheet-shaped reinforcing bodies that allows CA mortar to penetrate into the filled space.
Absorbs and disperses stress such as loads, shocks, and vibrations,
A reinforced structure of the CA mortar layer in the slab track that can alleviate this problem is obtained.

(3) In this invention, a reinforcing body formed in a sheet shape is inserted into the filling space and a spacer is also interposed. A space can be maintained between them by a spacer, making filling with CA mortar easy and reliable, maintaining good adhesion of the CA mortar layer to the back surface of the track slab and the top surface of the base, and sufficiently reinforcing the CA mortar layer. can be demonstrated.

(4) Since the present invention inserts a reinforcing body formed in a sheet shape into the filling space and also interposes a spacer, it is necessary to use a spacer to maintain the distance between the reinforcing bodies formed in a laminated sheet shape. This makes it possible to easily and reliably fill the space between the pine-shaped reinforcement bodies with CA mortar, maintain the installation position of the pine-shaped reinforcement bodies well, and make it possible to exert the reinforcing effect of the CA mortar layer equally in each part.

(5) Since the present invention interposes a spacer together with a sheet-shaped reinforcing body in the CA mortar layer filled in the filled space, the CA mortar layer is reinforced by the sheet-shaped reinforcing body. The effect can be further increased.

Because it has such excellent characteristics, it can be used not only for new slab tracks but also for repairing conventional slab tracks.

[Brief explanation of the drawing]

The figures show embodiments of the present invention; Fig. 1 is a longitudinal cross-sectional side view of a basic embodiment; Fig. 2 is a longitudinal cross-sectional side view of a case where elongated pine-shaped reinforcing bodies are folded and laminated; and Fig. 3 is a longitudinal cross-sectional side view of a basic embodiment. 4 is a perspective view showing the spacer in a folded state, and FIG. 5 is a plan view showing the relationship between the mat reinforcing member and the spacer. The symbols in the figure are explained as follows. 1
... Base, 2 ... Track slab, 3 ... CA mortar layer, 4 ... Reinforcement body formed in sheet shape, 5 ...
Spacer, 6...Rail.

Claims (1)

[Scope of utility model registration request] A reinforcing body formed into a sheet is placed with a spacer interposed to allow the cement-bituminous mixture to penetrate into the cement-bituminous mixture layer provided in the filled space formed between the top and bottom of the foundation and the track slab. A reinforcement structure of a cement-bituminous mixture layer in a slab track characterized by: