JPS6043504A - Construction of extension joint - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an expansion joint in which a composite material having a polymer/reactive resin emulsion as a matrix phase is used as an end member or backing material in the construction of expansion joint devices for road bridges, railways, etc. Regarding the construction method of the device.

In general, expansion joint devices are supported on both sides by anchors or the like in cutouts at the ends of opposing floor slabs, and are constructed so as to be located between opposing floor slabs. In constructing this expansion/contraction device, cement concrete is commonly used as an end member or backing material at the end of the floor slab.

The performance of cement concrete and concrete varies depending on the proportion of the composition, but the performance of cement concrete, which is commonly used as a civil engineering material, has a compressive strength of 200
~300Kg/c^, the tensile strength is 15~23Ko
/c″- and the bending strength is 28 to 42K (]/C
It is about 1 l', and about 1/13 and 1/7, respectively.

End members and backing materials used in construction of expansion joint devices are required to be strengthened in terms of tensile strength and bending strength relative to compressive strength, especially since bending strength is a composite stress of tension and compression.

Therefore, in design, strengths other than compressive strength are ignored and reinforcement materials such as reinforcing bars, PC steel bars, and steel 5ilR1 are used together.

Under these circumstances, in order to improve the strength of cement concrete, polymer cement containing polymers such as SBR as cement modifiers and admixtures has been proposed, and although it is used for the interior and exterior of buildings, it is essentially Since cement is used as a matrix phase (X), the improvement in tensile strength and bending strength is at most 0.2 to 3%, and it is not necessarily sufficient as an end member or backing material when constructing an expansion joint device. .

Resin concrete, which is a binder made of epoxy or unsaturated polyester resin with sufficient bending strength and mixed with dry aggregate, has also been proposed and used, but there are problems with cost and workability, and it is difficult to construct under wet surfaces. This has the disadvantage of significantly reducing performance.

Therefore, when considering materials that have the potential to improve strength as constituent materials, we find emulsions of various polymers, prepolymers, monomers, and reactive resins, but this type of material does not only polymerize polymers but also evaporate water. Because assimilation is an essential condition, it is not suitable as an end member of an expansion joint device or a backing material in a floor slab or the like where the thickness is determined, and it can only be used in practice as a thin film as an emulsion paint.

In view of these points, the present invention investigated new emulsion concrete and emulsion mortar in order to overcome the drawbacks of existing materials. As mentioned above, cement concrete is weak in tension, so impact force (tensile stress as a reaction force against compressive stress between 11 and θ) is said to act.
) has low resistance to

In the present invention, the materials used as end members and backing materials are used as a binder with a polymer/reactive resin emulsion as a matrix phase, and a hydraulic material such as cement is used as an internal extinguisher for water, and then hardened. We used a composite material with increased bending strength, so that the characteristics of the emulsion can be brought out even when applied in mass volume, and we used end members and backing materials that can withstand repeated shocks due to severe wheel loads. A method for constructing an expansion joint device is provided.

In the present invention, the polymer/reactive resin emulsion means a polymer or/and reactive resin emulsion.

Since the present invention uses a polymer/reactive resin emulsion as the matrix phase, the composite material will harden even without volatilization of water, but if a hydraulic material such as cement is mixed as a water extinguishing agent, excess water will cause the hydraulic material to harden. When consumed, it becomes a hard emulsion cured product, and together with the solidification due to hydration of the hydraulic material, the bending strength relative to the compressive strength becomes unprecedentedly large, and the ratio of bending strength to compressive strength becomes 1:
The ratio can be 5 to 1:2.

In addition, since the material uses water, there is no need for a drying process for the aggregate, and there is no need to secure a dry surface when casting as end members or backfilling material. regardless of,
It can be poured and filled in one go, and can be done with the same construction management as cement concrete.

The polymer/reactive resin that is a component of the emulsion used in the present invention includes epoxy resin, SDR, EVA,
Examples include polyacid resin and asphalt.

Hereinafter, the present invention will be explained in more detail with reference to Examples and Comparative Examples.

Example 1 Cement 235 Reactive resin emulsion 190 Water 25 Fine sand 590 Coarse aggregate 1200 Example 2 Mortar 315 Reactive resin emulsion 250 Water 25 Fine sand 630 Coarse sand 880 Comparative example 1 Cement 300 SBR-45 Water 150 Fine sand 868 Coarse aggregate 868 Comparative example 2 Cement 303 Fine sand 232 Coarse sand 553 Comparative aggregate 1064 Water reducing material 0.8 Comparative example 3 Epoxy resin (trade name Shimmy Bond #, 505) 250 Fine sand 75
0 1250 Example 1 and Example 2 are both examples of the composite material of the present invention, and the moderately reactive resin of the example is a liquid agent whose main component is an epoxy resin and a liquid agent whose main component is a polyamide resin. 8 =
It is a mixture of 2 parts.

Comparative Example 1 is a polymer cement-based small composite material that is mainly used as interior and exterior materials for buildings and decorative flooring materials.

This system uses a polymer emulsion as a cement modifier, and the amount added is 10 to 10% of the cement.
About 30% is normal, and at most about 50%. This is because a solidification system is used by the volatilization of the water contained in the emulsion.The emulsion polymer used is 5BRXEVA, thermoplastic resin such as acrylic, and is used for flooring, interior and exterior materials. However, the pouring thickness is up to about 2Qmm. Comparative Example 2 is an example of ordinary cement concrete, and Comparative Example 3 is an example of resin concrete. In addition, the units of ingredients in both the examples and comparative examples are ! ]/III.

Next, Table 1 shows a comparison of strength, etc. between the Examples and Comparative Examples.

Table 1 As is clear from Table 1, the emulsion concrete and emulsion mortar of Example 1.2, both of which had a polymer/reactive resin emulsion as the matrix phase, were the ordinary polymer cement of Comparative Example 1]-concrete, and the emulsion mortar of Comparative Example 2. Compared to cement concrete, other strength ratios to compressive strength are superior, and in particular, the necessary bending strength ratio can be secured at 115 to 1/2 to compressive strength, and the compressive strength and bending strength ratio of resin concrete of Comparative Example 3 is excellent. Lined up with strength ratio.

Furthermore, when stress and strain curves are taken, the stretching performance values shown in Table 1 are obtained, but the examples of the present invention with improved tensile properties also have a large amount of tensile strain. In other words, this suggests that it can withstand repeated impacts as a material for expanding and contracting devices.

Therefore, a composite material containing a polymer/reactive resin emulsion as a matrix phase and a hydraulic material mixed as a water extinguishing agent has increased bending strength compared to conventional cement concrete, etc., and is also suitable for construction of expansion joint devices. This enables one-time casting or filling regardless of the casting thickness, rather than using a thin film like an emulsion paint that is considered to be used as an end member or backing material.

As mentioned above, the present invention can be carried out with the same control method as cement concrete construction, and has excellent expansion and contraction using end members or backing materials made of composite materials with increased bending stress, which is a composite stress of tension and compression. The present invention provides a method for constructing a joint device.

Patent applicant Shobond Construction Co., Ltd. Patent attorney
Harumi Uno Director General of the Patent Office Kazuo Wakasugi 1. Indication of the case Patent Application No. 152846 of 1982 2 Title of the invention Composite material suitable for end members of expansion joint devices, backing material, and construction method of expansion joint devices (before amendment Construction method of expansion joint devices) 3. Relationship with the case of the person making the amendment Patent applicant Address 34, Ichigaya Honmura-cho, Shinjuku-ku, Tokyo Name Name: Shobond Construction Co., Ltd. Representative 1) 1939, Agent address: 7-10 Nishi-Shinjuku, Shinjuku-ku, Tokyo No. 19 No. 6,
Subject of the amendment Full text Amended specification 1, Name of the invention End member of an expansion joint device, Composite material suitable as a backing material and Construction method of an expansion joint device 2, Claims ■ Polymer/reactive resin emulsion as a matrix phase A hydraulic material is mixed into the binder to act as an internal extinguisher for the water contained in the polymer/reactive resin emulsion, and the ratio of bending strength to compressive strength after curing is approximately 1:5.
A composite material suitable for end members and backing materials of expansion joint devices, characterized by having a ratio of ~1:2.

■ A hydraulic material is mixed into a binder whose matrix phase is a polymer/reactive resin emulsion as an internal extinguisher for the water contained in the polymer/reactive resin emulsion, and the ratio of flexural strength to compressive strength after curing is approximately 1. =5
A method for constructing an expansion joint device, characterized in that a composite material having a ratio of ~1:2 is used as an end member and a backing material of the expansion joint device.

3. Detailed Description of the Invention The present invention relates to a composite material suitable for end members, backing materials, etc. of expansion joint devices for road bridges, railways, etc., and a method for constructing an expansion joint device.

In general, expansion joint devices are supported on both sides by anchors or the like in cutouts at the ends of opposing floor slabs, and are constructed so as to be located between opposing floor slabs. In constructing this expansion/contraction device, cement concrete is commonly used as an end member or backing material at the end of the floor slab.

The performance of cement concrete varies depending on the ratio of its composition, but the performance of cement concrete, which is commonly used as a civil engineering material, has a compressive strength of 200 to 200.
If it is 300KO/cm, the tensile strength is 15-23Ko
/cn+, and the bending strength is 28-42Kg/am
They are approximately 1/13 and 1/7 respectively.

End members and backing materials used in construction of expansion joint devices are required to be strengthened in terms of tensile strength and bending strength relative to compressive strength, especially since bending strength is a composite stress of tension and compression.

Therefore, in design, strengths other than compressive strength are ignored, and reinforcement materials Y1 such as reinforcing bars, PC steel bars, and steel fibers are used together.

Under these circumstances, in order to improve the strength of cement concrete, polymer cement containing polymers such as SBR as cement modifiers and admixtures has been proposed, and is used for the interior and exterior of buildings. Because cement is used as a matrix, the improvement in tensile strength and bending strength is only about 20 to 30% at most, and it cannot necessarily be said to be sufficient as an end member or backing material when constructing an expansion joint device.

Resin concrete, which is a binder made of epoxy or unsaturated polyester resin with sufficient IC bending strength and mixed with dry aggregate, has also been proposed and used;
There is a problem with workability, and there is a disadvantage that performance deteriorates significantly when installed under a wet surface.

However, when considering materials that have the potential to improve strength as constituent materials, there are various types of polymers, prepolymers, monomers, and reactive resins. Because assimilation through volatilization of water is an essential condition, it is not suitable as an end member of an expansion joint device or as a backing material for thick floor slabs, etc., and is only used in practice as a thin film as an emulsion paint.

In view of these points, the present invention investigated new emulsion concrete and emulsion mortar in order to overcome the drawbacks of existing materials. As mentioned above, cement concrete is weak in tension, so impact force (tensile stress is said to act as a reaction force to instantaneous compressive stress)
has low resistance to

The present invention uses materials used as end members and backing materials as a binding material having a polymer/reactive resin emulsion as a matrix phase, and a hydraulic material such as calcined gypsum or cement as an internal extinguisher for water, and further hardens. The characteristics of composite materials and emulsions with increased bending strength can be brought out even when constructed in mass volume, and end members and backing materials that can withstand repeated impacts due to severe wheel loads are used to expand and contract. The present invention provides a method for constructing a joint device. In the present invention, the polymer/reactive resin emulsion means a polymer or/and reactive resin emulsion.

Since the present invention uses a polymer/reactive resin emulsion as a matrix phase, the composite material hardens even without volatilization of water, but when a hydraulic material such as cement is mixed as a water extinguishing agent, excess water is used to harden the hydraulic material. When consumed, it becomes a solid emulsion cured product, and together with assimilation through hydration of the hydraulic material, the bending strength relative to the compressive strength becomes unprecedentedly large, and the ratio of the bending strength to the compressive strength becomes 1:1.
The ratio can be 5 to 1:2.

In addition, since the material uses water, there is no need for a drying process for the aggregate, and there is no need to secure a dry surface when casting as end members or backfilling material. regardless of,
It can be poured and filled in one go, and can be done with the same construction management as cement concrete.

The polymer/reactive resin that is a component of the emulsion used in the present invention includes epoxy resin, SBR, EV△,
Examples include polyacid resin and asphalt.

Hereinafter, the present invention will be explained in more detail with reference to Examples and Comparative Examples.

Example 1 Cement 235 Reactive resin emulsion 190 Water 25 Fine sand 590 Coarse aggregate 1200 Example 2 Mortar 315 Reactive resin emulsion 250 Water 25 Fine sand 630 Coarse sand 880 Comparative example 1 Cement 300 SBR45 Water 150 Fine sand 868 Coarse bone Material 868 Comparative Example 2 Cement 303 Fine Sand 232 Coarse Sand 553 Coarse Aggregate 1064 Water Reducing Material 0.8 Comparative Example 3 Epoxy Resin (Trade Name Showbond #-505) 250 Fine Sand 75
0 Coarse aggregate 1250 Both Example 1 and Example 2 are examples of the composite material of the present invention, and in the examples, the reactive resin was a liquid agent whose main component was an epoxy resin and a liquid agent whose main component was a polyamide resin. 8:
It is a mixture of 2 parts.

Comparative Example 1 is a polymer element-based composite material that is mainly used as interior and exterior materials for buildings and decorative flooring materials.

This system uses a polymer emulsion as a cement modifier, and the amount added is 10 to 10% of the cement.
It is usually about 30%, and about 50 at most. This is because it utilizes an assimilation system through the volatilization of the water contained in the emulsion.The polymer used in the emulsion is selected from thermoplastic resins such as SBR, EVA, and acrylic, and is used for flooring, interior and exterior materials. Even if it is used for concrete, the casting thickness is up to about 2Qmm. Comparative Example 2 is an example of ordinary cement concrete, and Comparative Example 3 is an example of resin concrete. In addition, the unit of the components in both Examples and Comparative Examples is Kg/111.

Next, Table 1 shows a comparison of strength, etc. between the Examples and Comparative Examples.

Table 1 As is clear from Table 1, the emulsion concretes of Examples 1 and 2 and ■Multi 32 mortar, both of which had a polymer/reactive resin emulsion as the matrix phase, were the ordinary polymer cement concrete of Comparative Example 1, and the ordinary polymer cement concrete of Comparative Example 2. Compared to cement concrete, other strength ratios to compressive strength are superior, and in particular, the necessary bending strength ratio can be secured at 115 to 1/2 to compressive strength, and the compressive strength and bending strength ratio of resin concrete of Comparative Example 3 is excellent. Lined up with strength ratio.

Furthermore, when taking the stress and strain curves, the elasticity performance values shown in Table 1 are lowered by 1W, but the examples of the present invention with improved tensile properties also have a large amount of tensile strain. In other words, this suggests that it can withstand repeated impacts as a material for expanding and contracting devices.

The composite material made in this way is supported on both sides via anchors etc. in the notches at the ends of the opposing floor slabs, for example, and is suitable for use in expansion joint devices installed between opposing floor slabs. Used as an end member and backing material in construction methods.

Therefore, a composite material in which a polymer/reactive resin emulsion is used as a matrix phase and a hydraulic material is mixed as a water extinguishing agent has increased bending strength compared to conventional concrete, etc., and is also suitable for construction of expansion joint devices. Instead of being used in a thin film like an emulsion paint that is considered to be used as an end member or backing material, it enables one-time casting or filling regardless of the casting thickness.

As mentioned above, the present invention is a composite material suitable for end members and backing materials of expansion joint devices, which can be carried out with the same level of control as cement concrete construction, and has increased bending stress, which is a composite stress of tension and compression. The present invention also provides an excellent construction method for an expansion joint device using end members or backing materials made of this composite material.

Patent applicant Shobond Construction Co., Ltd. Patent attorney
Harumi Uno

Claims (1)

[Claims] A hydraulic material is mixed into a binder having a polymer/reactive resin emulsion as a matrix phase as an internal extinguisher for the water contained in the polymer/reactive resin emulsion, and the ratio of bending strength to compressive strength after curing is approximately 1: 5-1
: By using a composite material of 2 as an end member and a backing material, it is possible to cast and fill in one time, regardless of the thickness of the poured filling part. Construction method of coupling device.