Segment seal material for civil engineering and construction

Abstract

Provided is a segment seal material for civil engineering and construction, the material being affixed simply and rapidly.　The present invention can be achieved by using a segment seal material for civil engineering and construction, the material characterized by comprising a first rubber part containing a water-expandable resin, a second rubber part not containing a water-expandable resin, and an adhesive part, wherein an adhesive strength of the segment seal material for civil engineering and construction is 1 N or greater.

Description

Segment sealant for civil engineering and construction

[0001] The present invention relates to a segment sealant for civil engineering and construction, and more particularly to a segment sealant for shield tunneling that is provided in the joints between segments for shield tunneling and provides functions such as preventing water leakage from the joints.

[0002] Conventionally, reinforced concrete construction is carried out by assembling a steel frame at the construction site, placing a wooden frame around the steel frame, and then pouring concrete into the frame.

[0003] However, in the case of water-blocking walls such as tunnels, dams, and water distribution channels, slope reinforcement walls on mountain slopes, and high-altitude structures such as buildings, depending on the installation location (for example, mountains, valleys, steep slopes, narrow ground, high places, etc.), reinforced concrete construction itself may be difficult. Furthermore, in the construction of tunnels, ventilation shafts, or water and sewerage systems, if concrete or steel walls are not constructed around the tunnels at the same time as excavation, the walls will collapse immediately after excavation, and the original purpose of the shield method, which is to construct tunnels and ventilation shafts one by one, cannot be achieved.

[0004] For this reason, in recent years, it has become common to prepare multiple reinforced concrete or steel pieces (i.e., multiple segments) in advance to match the construction location, construction purpose, etc., and then transport them to the construction site for civil engineering and building construction. The multiple segments are firmly connected to each other using connecting members (fastening bolts) to construct the desired civil engineering building.

[0005] In particular, it is necessary to prevent water leakage from the joints between multiple segments in tunnels, ventilation holes, manholes, water-blocking walls, slope reinforcement walls, etc. For this reason, prior art (Patent Document 1) proposes a composite sealant that is provided on the surfaces that form the joints between segments to improve the water-stopping properties of the joints between segments.

[0006] In particular, Patent Document 1 discloses that a water-stopping structure for a joint can be constructed and more water-stopping properties can be achieved by adopting, as a basic structure, an expansion part (13-1) made of a water-expanding material that has the property of expanding in volume by absorbing moisture from a sealing material (12-1), and a non-expanding part (14-1) made of a non-expanding rubber that has the property of not changing in volume even when exposed to moisture.

[0007] Therefore, there is still a demand for the development of a segment sealant for civil engineering and construction that, when applied to the surfaces that form the joints between segments, will more reliably stop water at the joints between segments, can be applied simply and quickly, and is economical, allowing for uniform and safe application.

[0008] Japanese Utility Model Application Laid-Open Publication No. 4-008918

[0009] The present invention proposes a segment sealant for civil engineering and construction that, when applied to the joint surfaces of concrete segments used in civil engineering or construction, firmly prevents water leakage at the joints between the segments, and effectively achieves the intended uses of civil engineering and construction structures such as tunnels, manholes, ventilation holes, water-blocking walls, retaining walls, slope-reinforced walls, and structural frames for buildings (tall structures such as buildings), while also significantly achieving ease of handling, ease of construction, uniform construction, economy, marketability, etc.

[0010] [One Aspect of the Present Invention] The present invention proposes the following as one aspect thereof. [1] A segment sealant for civil engineering and construction, comprising: a first rubber part containing a water-swelling resin; and an adhesive part; wherein the peel strength of the segment sealant for civil engineering and construction is 1 N or more; the compressive stress of the segment sealant for civil engineering and construction is more than 5.0 N / mm and not more than 65 N / mm; and / or the water stopping force of the segment sealant for civil engineering and construction is 0.1 MPa or more. [2] The segment sealant for civil engineering and construction according to [1], wherein the adhesive part comprises a primer agent. [3] The segment sealant for civil engineering and construction according to [1] or [2], wherein the adhesive part is located below the first rubber part and on a surface that comes into contact with the surface of the segment sealant for civil engineering and construction. [4] The segment sealing material for civil engineering and construction according to [1] or [2], further comprising a second rubber portion, the second rubber portion being located between the first rubber portion and the adhesive portion. [5] The segment sealing material for civil engineering and construction according to [1] or [2], further comprising a release material, the release material being located below the adhesive portion. [6] A segment sealing material for civil engineering and construction, comprising: a first rubber portion containing a water-swelling resin; and an adhesive portion; wherein the shear strength of the segment sealing material for civil engineering and construction is 1 N or more; the compressive stress of the segment sealing material for civil engineering and construction is more than 5.0 N / mm and 65 N / mm or less; and / or the water stopping force of the segment sealing material for civil engineering and construction is 0.1 MPa or more. [7] The segment sealing material for civil engineering and construction according to [6], characterized by comprising the features described in any one of [2] to [5].

[0011] The present invention is basically a structure comprising a first rubber part containing a water-swellable resin, a second rubber part (if necessary) not containing a water-swellable resin, and an adhesive part. The structure can exert the effects unique to the present invention.

[0012] That is, compared to conventional products, the present invention provides a pre-prepared adhesive portion, so that at civil engineering and construction sites, it is possible to quickly realize assistance in fastening the segments together and quickly achieve sealing (particularly watertightness) between the segments without going through processes such as adhesive (sealing) treatment when joining the segments together. Furthermore, it is possible to eliminate the complexity and hassle of the construction process at the construction site, and to improve the speed and stability of construction processing and watertightness, thereby achieving high levels of ease of handling, ease of construction, and shortening of construction time.

[0013] Furthermore, according to the present invention, the segment sealant can function satisfactorily even in subtropical and tropical regions where the average annual temperature is 17.5°C or higher, and in construction locations where the geothermal temperature is 17.5°C or higher.

[0014] Furthermore, according to the present invention, by making it into a long roll form (preferably by inserting a release material therebetween), it is possible to achieve compactness, easy transport, and it is possible to cut off the required length depending on the construction location and construction situation, thereby achieving ease of handling and ease of use, and also achieving marketability, ease of trading, high economic efficiency, shortened construction time, etc.

[0015] Fig. 1 is a schematic diagram showing various forms of the basic structure of the present invention. Fig. 2 is a schematic diagram showing the segment seal material (basic embodiment) of the present invention. Fig. 3 is a schematic diagram showing an embodiment of the segment seal material of the present invention. Fig. 4 is a schematic diagram of a test method for measuring the adhesive strength B (shear strength) of the segment seal material of the present invention. Fig. 5 is a schematic diagram of test specimen B used when measuring the water stopping power B of the segment seal material of the present invention.

[0016] [Definitions] [Physical Properties and Their Measurement Methods] (Adhesive Strength A: Adhesion Force: Peel Strength) The adhesive strength A: peel strength (N) of a segment sealant for civil engineering and construction is measured as follows. A test specimen A (length x width x thickness: 30 cm x 15 mm x mm) of the segment sealant for civil engineering and construction is prepared. This test specimen A is adhered to the surface of a concrete segment test plate (length x width x thickness: 15 cm x 7 cm x 4 mm) and a steel segment test plate (length x width x thickness: 15 cm x 7 cm x 1.5 mm) for 10 cm, and then the force when the test specimen is peeled 180 degrees is measured using a measuring device (product name: "Strograph" manufactured by Toyo Seiki Seisakusho, Ltd.). (Adhesive Strength B: Adhesion Force: Shear Strength) The adhesive strength B: shear strength (N) of a segment sealant for civil engineering and construction is measured as follows. A specimen B (length x width x thickness: 10 cm x 15 mm x 4 mm) of the segment sealant for civil engineering and construction is prepared. As shown in Figure 4, this specimen B is adhered to the surface of a concrete segment test plate (length x width x thickness: 15 cm x 7 cm x 4 mm) and a steel segment test plate (length x width x thickness: 15 cm x 7 cm x 1.5 mm) to a depth of 25 mm. After curing for 15 minutes, the shear force of the specimen is measured using a measuring device (product name: "Strograph" manufactured by Toyo Seiki Seisakusho Co., Ltd.). (Compressive Stress) The compressive stress (N / mm) of the segment sealant for civil engineering and construction is measured as follows. A specimen (length x width x thickness: 20 cm x 15 mm x 4 mm) of the segment sealant for civil engineering and construction is prepared. This test specimen was adhered to the surface of a brass test plate (length x width x height: 20 cm x 2.2 cm x 5 mm) and loaded into a compression test jig (a steel block measuring length x width x height: 20 cm x 12 cm x 2.5 cm, with a groove measuring 2.7 cm x 2.2 cm x 2.4 mm in length and the bottom of the groove having the same dimensions as the brass test plate) and two sets of these were prepared. The blocks were combined so that the grooves matched and compressed at a rate of 5 mm / min using a compression test device (product name "Autograph": manufactured by Shimadzu Corporation) to a mesh opening of 0.2 mm. The stress per unit length was measured 30 seconds after the specified mesh opening was reached. (Waterstop Force A) The waterstop force A of the segment sealant for civil engineering and construction was measured as follows.A civil engineering and construction segment sealant with a perimeter of 200 mm in diameter (length: 628 mm) and a perimeter of 206 mm (length: 646 mm) bonded at both ends with a rubber adhesive was used to prepare specimen A. This specimen A was loaded into two water pressure test jigs (steel blocks with a diameter x height of 32 cm x 2 cm), one of which had a groove with a top width x bottom width x depth of 2.7 cm x 2.2 cm x 2.4 mm dug to a diameter of 200 mm, and the other had a groove with a top width x bottom width x depth of 2.7 cm x 2.2 cm x 2.4 mm dug to a diameter of 206 mm), and the blocks were combined so that the grooves matched, and the blocks were compressed by tightening with bolts to a mesh opening of 1 mm. A predetermined water pressure (increased in 0.1 MPa increments from 0.0 MPa to a maximum of 2.0 MPa) was applied, and the presence or absence of water leakage was measured after 3 minutes had passed since the pressure was applied. (Waterstopping Force B) The waterstopping force B of a segment sealant for civil engineering and construction is measured as follows. The first rubber portion is molded into a sheet shape with a thickness of 2 mm (see Figure 5 for the shape), and an adhesive layer with a width of 10 mm or less is arranged around the outer periphery of a 60 mm x 60 mm sheet, or an adhesive is applied to the sheet to form a specimen B. The width is set to 10 mm or less so that the specimen does not protrude from the test jig and an accurate evaluation can be obtained. In addition, the thickness of the adhesive layer or adhesive applied to the specimen is set to at least 1 mm (1 mm in this test) to prevent gaps from occurring between the specimen and the metal jig after assembly and to obtain an accurate evaluation. This test piece B was attached to a metal test jig (125 mm x 100 mm x 23 mm: steel block), and then cured for 15 minutes. A 2.5 mm thick spacer was attached to the metal test jig, and one side of the metal test jig sandwiching the test piece was combined with another metal test jig, and the test pieces were compressed by tightening with bolts to a mesh opening of 1 mm. A predetermined water pressure (increased from 0.0 MPa in 0.1 MPa increments up to a maximum of 1.0 MPa) was applied, and the presence or absence of water leakage was measured three minutes after each application of pressure. (Temperature Adhesion) <High Temperature Adhesion> The high temperature adhesion of a segment sealant for civil engineering and construction is measured as follows.Test specimens of the segment sealant for civil engineering and construction (length x width x thickness: 15 cm x 15 mm x 4 mm) were prepared and adhered to the surfaces of a concrete segment test plate (length x width x thickness: 15 cm x 7 cm x 4 mm) and a steel segment test plate (length x width x thickness: 15 cm x 7 cm x 1.5 mm). They were then placed vertically in a temperature-controllable thermostat (product name "Thermostat": manufactured by Espec Corporation). After 24 hours at temperatures of 50°C, 60°C, 70°C, and 80°C, the test specimens were examined to determine whether they had peeled from the test plate. If no peeling occurred, it was determined that the test specimen had high-temperature adhesion. <Low-Temperature Adhesion> The low-temperature adhesion of the segment sealant for civil engineering and construction was measured as follows. Using the same test specimen and test plate as in the high-temperature adhesion test described above, the test specimen was adhered to the test plate after 24 hours of curing at temperatures of 5.0°C, 9.2°C, 13.9°C, and 17.5°C, and after curing for 1 hour, a peelability test was performed by hand. If the adhesive portion was difficult to peel from the test plate and the adhesive portion was deformed when peeled, it was determined that low-temperature adhesion was present.

[0017] [Segment Sealing Material] A segment sealing material is generally a material used to seal gaps (i.e., joints) between segments, particularly concrete or steel segments, when they are fastened together with fasteners (e.g., fastening bolts), particularly to prevent leakage of liquids (water). In fact, as shown in FIG. 1 , when segments 100 and 100′ are prepared and fastened together with fastening bolts (not shown), a segment sealing material 10 is fitted between one segment 100 (100′) and the other segment 100 (100′) to secure and seal them. [Shield Tunneling Method] The shield tunneling method is a construction method in which a cylindrical excavator called a shield tunneling machine excavates underground, and wall surfaces are constructed by assembling divided steel or concrete blocks (segments) and fastening them together with fastening bolts to prevent the excavated section from collapsing. [Parts (units)] The term "parts" is a concept that encompasses aspects such as a sheet, a film, a plate, a foil, a membrane, and a layer, regardless of the name.

[0018] [Embodiments of the Present Invention] [Basic Aspects] As one embodiment, the present invention can propose a segmented sealing material for civil engineering and construction, comprising: a first rubber portion containing a water-swellable resin; a second rubber portion (if necessary) not containing a water-swellable resin; and an adhesive portion; wherein the segmented sealing material for civil engineering and construction has one or more desired physical properties. As shown in Figure 2, the segmented sealing material for civil engineering and construction according to the present invention may be formed by laminating the first rubber portion, the second rubber portion (if necessary), and the adhesive portion in this order. The shape of the segmented sealing material for civil engineering and construction according to the present invention may be a rectangular parallelepiped, a cylindrical portion, or a truncated quadrangular pyramid (see Figure 3).

[0019] In the present invention, the adhesive portion is preferably located below the first rubber portion, on a surface that comes into contact with the surface of the segment sealant for civil engineering and construction.

[0020] [Physical Properties] (Adhesive Strength A: Adhesion Force: Peel Strength) In the present invention, the adhesive strength A (peel strength) of the segment sealant for civil engineering and construction is measured based on the above definition. The adhesive strength A of the segment sealant for civil engineering and construction has an average value of 1 N or more at room temperature (23°C) regardless of whether the test plate is a concrete segment test plate or a steel segment test plate, and preferably has a lower limit of 10 N or more, and more preferably a lower limit of 35 N or more.

[0021] (Adhesive strength B: adhesive force: shear strength) In the present invention, the adhesive strength B (shear strength) of the segment sealant for civil engineering and construction is measured based on the above definition. The adhesive strength B of the segment sealant for civil engineering and construction has an average value of 1 N or more at room temperature (23°C) whether the test plate is a concrete segment test plate or a steel segment test plate, and preferably has a lower limit of 5 N or more, and more preferably a lower limit of 10 N or more.

[0022] By setting the physical properties of the segment seal material for civil engineering and construction within the above-mentioned numerical ranges, it is possible to significantly achieve the inherent technical properties of the segment seal material for civil engineering and construction, such as ease of use, ease of handling, ease of installation, diversity of uses, market distribution, economic stability, and shortening of construction period.

[0023] (Compressive Stress) In the present invention, the compressive stress of the segment sealing material for civil engineering and construction is measured based on the above definition. The compressive stress of the segment sealing material for civil engineering and construction is more than 1 N / mm and not more than 65 N / mm, preferably with a lower limit of 3 N / mm or more and an upper limit of 48 N / mm or less, and more preferably with a lower limit of 5 N / mm or more and an upper limit of 32.5 N / mm or less, whether the test plate is a concrete segment test plate or a steel segment test plate.

[0024] Since the compressive stress of the civil engineering and construction segment seal material is within the above numerical range, water leakage will not occur at construction locations in typical shield tunnels (water pressure of 0.3 MPa).

[0025] (Waterstopping Force A) In the present invention, the waterstopping force A of the segment seal material for civil engineering and construction is measured based on the above [Definition]. The waterstopping force A of the segment seal material for civil engineering and construction is 0.1 MPa or more, as measured by the above measurement method, with the lower limit being preferably 0.2 MPa or more, and more preferably 0.3 MPa or more. It is understood from the technical meaning of "waterstopping force" that there is no need to limit the upper limit as long as the material has waterstopping force.

[0026] If the water stopping power of the segment sealant for civil engineering and construction is within the above numerical range, water leakage will not occur.

[0027] (Waterstopping Force B) In the present invention, the waterstopping force B of the segment seal material for civil engineering and construction is measured based on the above [Definition]. The waterstopping force B of the segment seal material for civil engineering and construction is 0.1 MPa or more, measured by the above measurement method, with the lower limit being preferably 0.2 MPa or more, and more preferably 0.3 MPa or more. It is understood from the technical meaning of "waterstopping force B" that there is no need to limit the upper limit as long as the material has waterstopping force B.

[0028] (High-Temperature Adhesion) <High-Temperature Adhesion> In the present invention, the high-temperature adhesion of the segment sealant for civil engineering and construction is measured and evaluated based on the above definition.

[0029] In the present invention, the segment sealant for civil engineering and construction is used in construction locations where the temperature is less than 80°C, preferably 70°C or less, and more preferably 60°C or less, and the adhesive portion is capable of achieving adhesiveness. Therefore, the segment sealant for civil engineering and construction does not peel off from the segment after adhesion.

[0030] Therefore, in the present invention, the adhesive portion is used in construction locations such as warm and humid climate zones, subtropical climate zones, and tropical climate zones where the average temperature is 17.5°C or higher, and can seal the gaps (joints) between segments without peeling off even after construction.

[0031] <Low-Temperature Adhesion> In the present invention, the low-temperature adhesion of the segment sealant for civil engineering and construction is measured and evaluated based on the above definition.

[0032] In the present invention, the segment sealant for civil engineering and construction is used at application locations where the temperature exceeds 8°C, preferably 9°C or higher, and more preferably 10°C or higher, and the adhesive portion is capable of achieving adhesiveness. Therefore, the segment sealant for civil engineering and construction does not peel off from the segment after adhesion. The upper limit is the temperature described above for high-temperature adhesion.

[0033] Therefore, in the present invention, the adhesive portion is used in regions with cold or polar climates, and can seal the gaps (joints) between segments without peeling off even after installation.

[0034] [Adhesive Section] Therefore, in the present invention, by providing an adhesive section, it is possible to easily join segments together without the need for an adhesive treatment process at the construction site, and it has the advantage of being able to easily adjust the length, etc. of the segment sealant for civil engineering and construction as appropriate depending on the geology, geothermal energy, occurrence of spring water, etc. at the civil engineering and construction site. Therefore, the adhesive section can be configured by adjusting the adhesive and physical properties (viscosity, etc.) depending on the installation and use purpose.

[0035] The adhesive portion may be made of an adhesive, and a pressure-sensitive adhesive is preferred as the adhesive, and a synthetic rubber (low-vulcanized to semi-vulcanized) or synthetic resin adhesive is preferably used. For example, the synthetic resin adhesive may be an acrylic resin adhesive, a silicone resin adhesive, a urethane resin adhesive, a rubber resin adhesive, or the like, and an acrylic resin adhesive is preferably used.

[0036] Synthetic rubbers (semi-vulcanized) are classified according to the means of synthesis, and examples thereof include isoprene rubber (IR), butadiene rubber (BR), styrene-butadiene rubber (SBR), chloroprene rubber (CR), nitrile rubber (NBR), polyisobutylene (butyl) rubber (IBR), ethylene propylene rubber (EPR), chlorosulfonated polyethylene (CSR), acrylic rubber (ACR), fluororubber (FKR), epichlorohydrin rubber (ECOR), urethane rubber (UR), and silicone rubber (SR).

[0037] Examples of "synthetic resins" include polyurethane (PUR), polystyrene (PS), polyethylene (PE), polypropylene (PP), polyacrylic resin (PA), epoxy resin, polycarbonate (PC), polyphenol (PF), polyvinyl chloride (PVC), urea resin (UF), polysilicone (SI), polyimide (PI), melamine resin (MF), and fluororesin (PF).

[0038] The "acrylic resin adhesive" is preferably a copolymer of butyl acrylate, 2-ethylhexyl acrylate, a monomer containing an acidic group, other monomers, etc. Examples of the monomer containing an acidic group include carboxyl group-containing monomers such as (meth)acrylic acid, itaconic acid, maleic acid, and crotonic acid. Examples of other monomers include vinyl acetate, styrene, glycidyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, methyl (meth)acrylate, and 2-hydroxypropyl (meth)acrylate.

[0039] <Adhesion Imparting Agent> In the present invention, an adhesion imparting agent may be used, and examples thereof include petroleum-based resins such as aliphatic, aromatic, alicyclic, copolymer, and hydrogenated resins; terpene-based resins such as polyterpene and terpene phenol resin; xylene-based resins such as modified xylene resin; phenol-based resins such as alkylphenol resin and modified phenol resin; rosin-based resins such as coumarone-indene phase oil, rosin, and modified rosin; shellac, dammar, copal, polybutene, polyisobutylene, liquid polychloroprene, and liquid polybutadiene.

[0040] In the present invention, hot melt adhesives, delayed tack adhesives, and double-sided adhesive tapes can also be used as adhesives.

[0041] [Primer] In the present invention, a primer may be used, and a natural or synthetic rubber latex or a synthetic resin emulsion is preferably used. For example, the natural or synthetic rubber latex may be composed of a styrene butadiene rubber (SBR), a neoprene, or a chloroprene, and the synthetic resin emulsion may be composed of an acrylic, silicone, or urethane type, and preferably an acrylic type.

[0042] The thickness of the adhesive portion is 5 mm or less, preferably 4 mm or less, and more preferably 3 mm or less.

[0043] By having the thickness of the adhesive portion within the above numerical range, it is possible to significantly achieve the inherent technical properties of a segment sealant for civil engineering and construction, such as ease of use, ease of handling, ease of installation, diversity of uses, market availability, economic stability, and shortened construction time.

[0044] [First Rubber Part] The first rubber part absorbs water at the application site and acts as a waterproofing agent. The first rubber part contains a water-swelling resin and an optional agent.

[0045] The thickness of the first rubber portion is 0.1 mm or more and 30 mm or less, preferably the lower limit is 0.5 mm or more and the upper limit is 20 mm or less, and more preferably the lower limit is 1.0 mm or more and the upper limit is 10 mm or less.

[0046] When the thickness of the first rubber portion is within the above numerical range, it is possible to significantly achieve the inherent technical properties of a segment sealant for civil engineering and construction, such as ease of use, ease of handling, ease of installation, versatility in uses, market distribution, and economic stability.

[0047] <Water-Swellable Resin> The water-swellable resin is not particularly limited as long as it is a resin that expands by incorporating water into its molecules. For example, polyacrylic acid, modified polyvinyl alcohol, vinyl alcohol-acrylic acid copolymer, olefin-maleic anhydride, isobutylene-maleic anhydride copolymer, polyvinyl alcohol-acrylic acid copolymer, starch derivative, carboxymethyl cellulose derivative, etc. are preferably used.

[0048] <Rubber Component> In the present invention, the first rubber portion contains a rubber component. Examples of the rubber component include natural rubber and / or synthetic rubber. Examples of synthetic rubber include styrene butadiene rubber (SBR), isoprene rubber (IR), polybutadiene rubber (BR), acrylonitrile rubber (NBR), acrylic rubber (ACM), ethylene propylene rubber (EPDM), chloroprene rubber (CR), fluororubber, urethane rubber, acrylic-butadiene rubber (ABR), acrylonitrile-isoprene rubber (NIR), and acrylonitrile-chloroprene rubber (NCR). One or more of these common natural and synthetic rubbers can be appropriately selected and used.

[0049] <Penetrating Agent> In the present invention, a penetrating agent may be used, which is blended as a waterway agent to facilitate the penetration of water into the rubber composition. Examples of the penetrating agent include polyalkylene oxide derivatives.

[0050] The polyalkylene oxide derivative is a compound obtained by polymerizing or addition polymerizing ethylene oxide and / or polypropylene oxide, and examples thereof include alkylene oxide polymers or copolymers such as polyethylene glycol, polypropylene glycol, and ethylene oxide-propylene oxide copolymers; polyoxyethylene alkyl ethers such as polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, and polyoxyethylene oleyl ether; and polyoxyethylene allyl ethers such as polyoxyethylene octylphenyl ether and polyoxyethylene nonylphenyl ether.

[0051] <Stabilizer> The present invention may contain a stabilizer. The stabilizer is incorporated to prevent a decrease in the volume expansion coefficient of the rubber portion and improve long-term stability. An example of a stabilizer is thermosetting polyurethane. Thermosetting polyurethane is a compound obtained by blending a prepolymer (molecular weight 1000 to 4000) made of polyether glycol isocyanate with a curing agent (molecular weight 100 to 400) made of a polyether glycol derivative having terminal hydroxyl groups with a functionality of two or more. The amount of curing agent to be blended is determined based on the NCO content % of the prepolymer, the OH equivalent of the curing agent, and the OH / NCO ratio, and the number of parts of curing agent to be blended per 100 parts by weight of prepolymer is determined using the following formula: The prepolymer and curing agent are blended into the raw rubber composition and cured by the heat during vulcanization molding.

[0052] <Optional Agents> In the present invention, the first rubber portion may contain, as optional agents, rubber-forming agents such as vulcanizing agents, antioxidants, plasticizers, reinforcing agents, extenders, fillers, coloring materials (pigments, dyes), and the like.

[0053] Examples of vulcanizing agents include sulfur, magnesium oxide, quinoid-based vulcanizing agents, peroxide-based vulcanizing agents, amine-based vulcanizing agents, resin-based vulcanizing agents, and organic sulfur-based vulcanizing agents. Vulcanization aids and vulcanization accelerators can also be used. Specific examples of vulcanization aids include zinc oxide, and specific examples of vulcanization accelerators include thiuram compounds, guanidine compounds, sulfenamide compounds, dithiocarbamates, thiourea compounds, and xanthate compounds.

[0054] <Manufacturing Method> In the present invention, the first rubber portion can be prepared by compounding a rubber component, a superabsorbent resin, a polyalkylene oxide derivative, and a thermosetting polyurethane (a mixture of a prepolymer and a curing agent), mixing them using a general rubber mixer such as an open roll, a kneader, or a Banbury mixer, molding them using a general rubber molding machine such as a calendar, a casting machine, or an extrusion machine, and vulcanizing them using a general vulcanizer such as a hot press, an injection machine, or a vulcanizing can.

[0055] [Another aspect of the present invention] [Second rubber portion] In the present invention, preferably, a second rubber portion is further provided, and the second rubber portion can be configured to be located between the first rubber portion and the adhesive portion.

[0056] In the present invention, the second rubber portion does not contain a water-swellable resin or a penetrant, and is formed to protect the first rubber portion, which contains a large amount of water-swellable components, and to more firmly support the adhesion of the segments to each other.

[0057] The thickness of the second rubber portion is 0.05 mm or more and 30 mm or less, preferably the lower limit is 0.75 mm or more and the upper limit is 20 mm or less, and more preferably the lower limit is 0.1 mm or more and the upper limit is 10 mm or less.

[0058] When the thickness of the second rubber portion is within the above numerical range, the inherent technical properties of the segment sealant for civil engineering and construction, such as ease of use, ease of handling, ease of installation, versatility in uses, market distribution, and economic stability, can be significantly achieved.

[0059] <Rubber Component> The second rubber portion can use the rubber component described for the first rubber portion, and may be composed of, for example, natural rubber, isoprene rubber, styrene-butadiene rubber, chloroprene rubber, butadiene rubber, nitrile rubber, ethylene-propylene rubber, butyl rubber, or the like.

[0060] <Optional Agents> and <Manufacturing Method> The second rubber portion may contain the optional agents described for the first rubber portion. The second rubber portion can be prepared by compounding a rubber component and a thermosetting polyurethane (a mixture of a prepolymer and a curing agent) and mixing them using a general rubber mixer such as an open roll, kneader, or Banbury mixer, molding them using a general rubber molding machine such as a calendar, casting machine, or extrusion machine, and vulcanizing them using a general vulcanizer such as a hot press, injection, or vulcanizer. The first rubber portion and the second rubber portion are then bonded together with an adhesive. Alternatively, the first rubber portion and the second rubber portion may be produced by coextrusion as follows.

[0061] [Method for manufacturing segment sealant for civil engineering and construction] The unvulcanized first rubber part and second rubber part are placed in separate extrusion molding machines, and are co-extruded through special molds into the shape shown in Figure 2. The material is then thermally vulcanized using a microwave continuous rubber heating device (UHF) or a hot air heating device (HAV), or both, cooled, and if necessary, a primer layer is applied. The pressure-sensitive adhesive is laminated on the material, and a release liner is attached and the material is wound up to produce the material.

[0062] [Another aspect of the present invention] [Release material] In a preferred aspect of the present invention, a release material is provided on the adhesive portion (the side where the segments are attached). By applying a release material to the adhesive portion, the adhesive portion can be protected and effectively prevented from adhering to other components before application. Furthermore, since the segment sealant for civil engineering and construction can be manufactured in a rolled state in the final manufacturing process, it has excellent market introduction and transportability. Furthermore, during application, the release material can be peeled off and the segment sealant for civil engineering and construction can be applied to the desired segment (easy application), which is very convenient because it improves work efficiency.

[0063] (Release Material) Examples of the release material include paper (e.g., fine paper, kraft paper, glassine paper) impregnated with a release agent (e.g., dichloromethane, alcohol, acid or alkaline solution, etc.), synthetic resin film, and paper and resin film stack. Examples of the synthetic resin film include films of PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), polyethylene naphthalate (PEN), polyvinyl chloride resin (PVC), polystyrene (PS / OPS), acrylic (AC), etc.

[0064] The thickness of the release material is 0.03 mm or more and 0.3 mm or less, preferably the lower limit is 0.05 mm or more and the upper limit is 0.2 mm or less, and more preferably the lower limit is 0.07 mm or more and the upper limit is 0.15 mm or less.

[0065] By ensuring that the thickness of the release material is within the above numerical range, the adhesive portion can be significantly protected, and the inherent technical characteristics such as ease of handling, ease of installation, ease of use, versatility in applications, shortened construction time, marketability, and economic stability can be significantly achieved.

[0066] [Uses] The segment sealing material for civil engineering and construction according to the present invention is used as a sealing material for segments used in tunnels, manholes, retaining walls, slope reinforced walls, impermeable walls for dams, building frames, etc., and more specifically as a sealing material for segments used in shield tunneling.

[0067] [Embodiments] [Embodiment A] [Segment seal material A for civil engineering and construction] (Material preparation) The following were prepared to prepare the segment seal material A of the examples and comparative examples. <First rubber part> The first rubber part was mainly made of chloroprene rubber, with a modified acrylic crosslinked polymer as the water-swellable resin, and optional additives such as a vulcanizing agent, an antioxidant, a plasticizer, a reinforcing agent, a filler, and a coloring material. The components were kneaded, vulcanized, and then rolled. <Second rubber part> The second rubber part was mainly made of chloroprene rubber, did not contain a water-swellable resin, and optional additives such as a vulcanizing agent, an antioxidant, a plasticizer, a reinforcing agent, a filler, and a coloring material. The components were kneaded, vulcanized, and then rolled. <Adhesive Part> Adhesive: Thermoplastic rubber-based hot melt adhesive (product name "Evergrip": manufactured by Toagosei Co., Ltd.) Primer: Chloroprene rubber-based solvent-based primer Adhesive (used only in the comparative example): Application adhesive (product name "AT-G10": manufactured by Takiron C.I. Co., Ltd.) Release material: Release paper (product name "Sumirees": manufactured by Sumika-Kakoushi Co., Ltd.) (Preparation) The first rubber part and the second rubber part were placed in separate extrusion molding machines and co-extruded through special molds to form the cross-sectional shape shown in the upper right figure of Figure 2. The parts were then thermally vulcanized using a microwave continuous rubber heating device and cooled. The exposed surface of the second rubber part was passed over the surface of a roll immersed in a primer liquid to form a primer layer, thereby producing a strip-shaped sealing material body. In the example, a heated and melted adhesive was applied with an applicator to the primer agent (part) laminated on the second rubber part surface of the sealing material body, and the parts were laminated. The release paper was then attached to the adhesive surface while being wound up, to prepare a segment sealing material for civil engineering and construction. For the comparative example, a segment sealant for civil engineering and construction was prepared in the same manner as in the above example, except that no adhesive portion was formed.

[0068] [Evaluation Tests] The following measurements and evaluations were carried out on the segment sealant A for civil engineering and construction. (Evaluation Test 1: Adhesion Strength A: Peel Strength) The adhesion strength (peel strength A) of the Examples and Comparative Examples was measured using the measurement method described in the [Definitions] section above, and the results are shown in Table 1. Example 1: A test specimen in which the Example was adhered to a steel segment test plate. Example 2: A test specimen in which the Example was adhered to a concrete segment test plate. Comparative Example 1: A test specimen in which the sealing material of the Comparative Example was applied to a steel segment test plate and bonded with the above adhesive. Comparative Example 2: A test specimen in which the sealing material of the Comparative Example was applied to a concrete segment test plate and bonded with the above adhesive.

[0069]

[0070] (Evaluation Test 2: Compressive Stress) The compressive stress of Example 3 was measured by the measurement method described in the above section [Definitions], and the results are shown in Table 2. Example 3: A test specimen in which the Example was adhered to a brass test plate.

[0071]

[0072] (Evaluation Test 3: Water Stopping Power A) The water stopping power A of Example 4 was measured by the measurement method described in the above section [Definitions] and evaluated according to the following criteria, and the results are shown in Table 3. Example 4: A test specimen in which the Example was adhered to a water pressure test jig. (Evaluation Criteria) Rating ⊚: No water leakage was observed after the test. Rating ×: Water leakage was observed after the test.

[0073]

[0074] (Evaluation Test 4: High-Temperature Adhesion) The high-temperature adhesion of Examples 1 and 2 was measured using the measurement method described in the above section [Definitions] and evaluated according to the following criteria, with the results shown in Table 4. Example 1: A test specimen in which the Example was adhered to a steel segment test plate. Example 2: A test specimen in which the Example was adhered to a concrete segment test plate. (Evaluation Criteria) Rating ⊚: After the test, no peeling was observed between the segment and the sealant. Rating ◯: After the test, peeling was observed between the segment and the sealant in approximately 10% or less of the total. Rating △ (Standard): After the test, peeling was observed between the segment and the sealant in approximately more than 10% but less than 40% of the total.

[0075]

[0076] (Evaluation Test 5: Low-Temperature Adhesion) The low-temperature adhesion of Examples 1 and 2 was measured using the measurement method described in the above section [Definitions] and evaluated according to the following criteria, with the results shown in Table 5. Example 1: A test specimen in which the Example was adhered to a steel segment test plate. Example 2: A test specimen in which the Example was adhered to a concrete segment test plate. (Evaluation Criteria) Rating ⊚: During the test, the test specimen adhered to the test plate and was difficult to peel off, with significant deformation of the adhesive layer observed upon peeling. Rating ◯: During the test, the test specimen adhered to the test plate and was difficult to peel off, with slight deformation of the adhesive layer observed upon peeling. Rating △ (Standard): During the test, the test specimen adhered to the test plate and was relatively easy to peel off, with no deformation of the adhesive layer upon peeling.

[0077]

[0078] [Embodiment B] [Segment seal material B for civil engineering and construction] (Material preparation) The following were prepared to prepare the segment seal materials of Example B and Comparative Example B. The <first rubber part>, <second rubber part>, and release material were the same as those of the segment seal material A for civil engineering and construction, and the <adhesive part> was as follows. <Adhesive part> Adhesive B1: Nitrile rubber adhesive (product name "Bond G103": manufactured by Konishi Co., Ltd.) Adhesive B2: Modified silicone adhesive (product name "Super X": manufactured by Cemedine Co., Ltd.) Adhesive B3: Vinyl acetate adhesive (product name "Bond 40007": manufactured by Konishi Co., Ltd.) Adhesive B4: Chloroprene rubber adhesive (product name "Bond G10": manufactured by Konishi Co., Ltd.) Adhesive B5: Modified silicone epoxy resin adhesive (product name "Bond Eflex": manufactured by Konishi Co., Ltd.) (Preparation) The first rubber part and the second rubber part were placed in separate extruders and co-extruded through special molds to form a cross-sectional shape as shown in the upper right diagram in Figure 2 , followed by thermal vulcanization using a microwave continuous rubber heating device and cooling, and the exposed surface of the second rubber part was passed over the surface of a roll immersed in a primer liquid to form a primer layer, thereby producing a strip-shaped sealing material main body. For the waterproofing force B test, the first rubber part was molded into a sheet shape with a thickness of 2 mm to produce a sheet-like specimen B as shown in Figure 5. For Example B, a segmented sealant for civil engineering and construction was prepared by applying a heat-melted adhesive with an applicator to the primer agent (part) laminated on the second rubber part surface of the sealing material body, laminating the primer, and rolling up the sheet while attaching a release paper to the adhesive surface. The sheet-like specimen was then coated with a heat-melted adhesive with an applicator, laminating the primer, and preparing a sheet-like specimen. For Comparative Example B, a segmented sealant for civil engineering and construction was prepared in the same manner as in the above Example, except that no adhesive part was formed.

[0079] [Evaluation Test] The following measurements and evaluations were carried out on the segment sealant B for civil engineering and construction.

[0080] (Evaluation Test 6: Adhesive Strength B: Shear Strength) The adhesive strength B (shear strength) of the Examples and Comparative Examples was measured using the measurement method described in the section [Definitions] above, and the results are as shown in Table 6. Examples 1 and 2 are as described in the section [Segment Sealing Material A for Civil Engineering and Construction] above. Comparative Example B1: A test specimen in which the comparative sealing material was applied to a steel segment test plate and bonded with the adhesive B1. Comparative Example B2: A test specimen in which the comparative sealing material was applied to a steel segment test plate and bonded with the adhesive B2. Comparative Example B3: A test specimen in which the comparative sealing material was applied to a steel segment test plate and bonded with the adhesive B3. Comparative Example B4: A test specimen in which the comparative sealing material was applied to a concrete segment test plate and bonded with the adhesive B4. Comparative Example B5: A test specimen in which the comparative sealing material was applied to a concrete segment test plate and bonded with the adhesive B5.

[0081]

[0082] (Evaluation Test 7: Watertightness B) The watertightness B of the Examples and Comparative Examples was measured by the measurement method described in the above section [Definitions] and evaluated according to the following criteria, and the results are shown in Table 7. Example B1: A test specimen in which a sheet-like test specimen B coated with the pressure-sensitive adhesive of [Embodiment A] (thermoplastic rubber-based hot melt adhesive (trade name "EVER GRIP": manufactured by Toagosei Co., Ltd.)) was adhered to a metal test jig. Comparative Example B6: A test specimen in which a sheet-like test specimen B1 coated with the adhesive B1 was adhered to a metal test jig. Comparative Example B7: A test specimen in which a sheet-like test specimen B2 coated with the adhesive B2 was adhered to a metal test jig. Comparative Example B8: A test specimen in which a sheet-like test specimen B3 coated with the adhesive B3 was adhered to a metal test jig. Comparative Example B9: A test specimen in which a sheet-like test specimen B4 coated with the adhesive B4 was adhered to a metal test jig. Comparative Example B10: A test piece in which the sheet-like test piece B5 coated with the adhesive B5 was adhered to a metal test jig.

[0083] (Evaluation Criteria) Evaluation ⊚: No water leakage was observed after the test. Evaluation ×: Water leakage was observed after the test.

[0084]

[0085] [Overall Evaluation] It was confirmed that the Examples had superior adhesiveness of the segment sealant for civil engineering and construction, and had a high sealing effect, especially a high water-stopping ability, and fully achieved the function of a sealant compared to the Comparative Examples. It was also confirmed that the Examples could achieve unique effects such as ease of handling, ease of application, ease of use, versatility in applications, shortened construction period, marketability, economic stability, and protection. Explanation of symbols in the drawings

[0086] REFERENCE SIGNS LIST 1 First rubber part (containing water-swellable rubber) 2 Second rubber part (containing non-water-swellable rubber) 3 Adhesive part 10 Segment sealant for civil engineering and construction 100 Segment for civil engineering and construction 100' Segment for civil engineering and construction

Claims

1. A segment sealant for civil engineering and construction, comprising: a first rubber part containing a water-swelling resin; and an adhesive part; wherein the peel strength of the segment sealant for civil engineering and construction is 1 N or more; the compressive stress of the segment sealant for civil engineering and construction is more than 5.0 N / mm and not more than 65 N / mm; and / or the water stopping power of the segment sealant for civil engineering and construction is 0.1 MPa or more.

2. The segment sealant for civil engineering and construction according to claim 1, wherein the adhesive portion is provided with a primer.

3. A segment sealant for civil engineering and construction as described in claim 1 or 2, characterized in that the adhesive portion is located below the first rubber portion and on the surface that comes into contact with the surface of the segment sealant for civil engineering and construction.

4. A segment sealing material for civil engineering and construction as described in claim 1 or 2, further comprising a second rubber portion, the second rubber portion being located between the first rubber portion and the adhesive portion.

5. A segment sealant for civil engineering and construction according to claim 1 or 2, further comprising a release material, said release material being located below said adhesive portion.

6. A segment sealant for civil engineering and construction, comprising: a first rubber part containing a water-swelling resin; and an adhesive part; wherein the shear strength of the segment sealant for civil engineering and construction is 1 N or more; the compressive stress of the segment sealant for civil engineering and construction is more than 5.0 N / mm and not more than 65 N / mm; and / or the water stopping power of the segment sealant for civil engineering and construction is 0.1 MPa or more.

7. A segment sealant for civil engineering and construction according to claim 6, characterized in that it comprises the features set forth in any one of claims 2 to 5.

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