JP6406976B2 - Rubber molded waterproofing material and method for producing the same - Google Patents

Description

  The present invention relates to a concrete secondary product used adjacently, for example, a unit wall member constituting a seawall or retaining wall, a unit waterway member constituting a U-shaped channel, and a joint of a concrete secondary product such as a box culvert. The present invention relates to a rod-shaped rubber molded water-stopping material that is disposed in the gap between the gaps along the opening between the gaps and stops intrusion water (rainwater, seawater, groundwater, etc.) that has entered the gap.

  This kind of rubber-made molded water-stopping material is pressed and crushed by a pair of surfaces in a play space formed between a pair of opposed surfaces (between opposed end surfaces of adjacent concrete secondary products). Interpose.

  For this reason, this type of rubber-made molded water-stopping material is required to allow crushing due to the above-mentioned pressing, and a technique for forming a sponge rubber into a rod shape and using it as a water-stopping material is known to achieve this purpose. . Since this sponge rubber has a large number of pores inside and is soft, it can properly allow crushing by the above-mentioned pressing.

  For example, in Patent Document 1 below, a rubber molded stopper having a structure in which the outer peripheral surface of a cross-sectional shape of sponge rubber formed in a rod shape in the direction orthogonal to the axis is covered with a butyl adhesive (non-vulcanized butyl rubber) to supplement the water stoppage. A water material is disclosed.

  In other words, the waterstop material of Patent Document 1 below is different from the sponge rubber in that the cross-sectional shape in the direction perpendicular to the axis is provided with a sponge rubber at the center and a butyl adhesive layer covering the outer peripheral surface of the sponge rubber. It has a structure for the body. The butyl adhesive is a rubber material having a water-stopping property, but is not vulcanized, and is a soft and poor elastic material.

JP-A-8-93042

  In the waterstop material disclosed in Patent Document 1, both the sponge rubber and the butyl adhesive constituting the waterstop material are soft and easily deformed. Can be interposed.

  However, since both sponge rubber and butyl adhesive are poor in elasticity, the elastic repelling force of the water-stopping material as a whole is weak, and the outer peripheral surface of the water-stopping material (outer peripheral surface of the butyl-based adhesive layer) Cannot be pressed properly.

  Moreover, even if the sponge rubber is composed of rubber capable of exerting an elastic repulsion force, the butyl adhesive layer covering the outer peripheral surface of the sponge rubber is separate from the sponge rubber, and is soft and lacks elasticity. The elastic repulsive force is reduced, and the outer peripheral surface of the water-stopping material cannot be effectively pressed against the opposing surface constituting the gap.

  Therefore, the water-stopping material of Patent Document 1 may not prevent a gap from being formed between its outer peripheral surface and at least one of a pair of opposing surfaces that constitute a gap, and thus has a water-stopping effect. It has a problem that it cannot be held effectively.

  It is difficult to return to the original state from the crushed state again, especially when the concrete secondary product placed adjacently contracts due to changes in temperature, etc., and the width of the gap increases (opens). Therefore, the above problem becomes remarkable.

  The present invention provides a rubber molded water-stop material capable of exerting an elastic repulsive force against the same pair of opposing surfaces while allowing crushing by a pair of opposing surfaces constituting a gap, and a method for manufacturing the same.

  In short, the rubber molded water-stopping material according to the present invention is disposed in a state where it is pressed and crushed by a pair of surfaces in a gap formed between a pair of opposed surfaces, and is used to stop intrusion water. Assuming that it is a stick-shaped rubber molded water-stopping material that drains water, it has a structure with a soft part at the center and a hard part covering the outer periphery of the soft part in the cross-sectional shape in the direction perpendicular to the axis The soft portion includes a large number of pores and a sponge-like partition wall separating the pores, and has a structure in which the outer peripheral portion of the partition wall is integrated with the inner peripheral portion of the hard portion. In addition, the partition wall of the soft part and the hard part are made of vulcanized rubber.

  The rubber molded water-stopping material according to the present invention having the above structure allows a crushing due to the pressing by the pores of the soft part and elastically repels by the partition wall and the hard part of the soft part and the pair of opposed surfaces. By pressing the outer peripheral surface of the water-stopping material, which is the outer peripheral surface of the hard portion, against each of these, water can be effectively stopped.

  Preferably, by forming the pores of the soft part as independent pores, the partition wall can be secured to obtain a desired hardness, and also when the molded water-stopping material is used in a state of being cut off, To prevent water from entering through the pores.

  Also, the partition wall of the soft part and the hard part are made of water-expanded rubber vulcanized, or the partition part of the soft part is made of vulcanized non-expandable rubber, and the hard part is vulcanized with water-expanded rubber. By comprising, the said water expansion | swelling rubber absorbs intrusion water, expand | swells, it expands the diameter of the whole water stop material, and can aim at water stop more reliably.

  Further, the method for producing a rubber molded water-stopping material according to the present invention includes a rubber molded water-stopping material having the structure described above, that is, a soft portion at the center of the cross-sectional shape in the direction perpendicular to the axis and an outer periphery of the soft portion. It is a manufacturing method of the rod-shaped rubber molded water stop material which has a structure provided with the hard part which covers a part.

Specifically, by adjusting the addition amount of the vulcanizing agent and the vulcanization accelerator added to each of the hard part rubber material and the soft part rubber material containing the foaming agent, the hard part rubber material and the above In the step of heating and vulcanizing the extruded product formed by extruding the rubber material for the soft part at the same time, the vulcanization of the hard part rubber material is completed earlier than the vulcanization of the soft part rubber material, The rubber material for the hard part and the rubber material for the soft part are appropriately integrated while suppressing deformation of the extruded product in the axial direction due to pores generated by foaming of the foaming agent in the soft part rubber material. The inner peripheral part of the hard part and the outer peripheral part of the partition wall separating the pores of the soft part are integrated.

  According to the rubber molded water-stopping material according to the present invention, the outer peripheral surface of the rubber sealant is elastically repelled against a pair of opposing surfaces constituting the gap while being appropriately crushed in the gap. It is possible to prevent the intruding water from being effectively blocked by preventing the gap from being generated by pressing.

  Further, both the partition wall of the soft part and the hard part covering the outer peripheral part of the partition wall are made of vulcanized rubber so as to have high elasticity and high strength and to ensure the exertion of elastic repulsion.

  Furthermore, since the outer peripheral part of the partition wall of the soft part and the inner peripheral part of the hard part are integrated, the partition part of the soft part backs up the hard part from the inside and effectively exerts an elastic repulsion force. .

  Moreover, according to the manufacturing method of the rubber molded water stop material which concerns on this invention, the rubber molded water stop material which concerns on the said this invention can be effectively manufactured with a simple method.

The perspective view which cuts and shows the rubber molding water stop material which concerns on this invention partially. Sectional drawing of the axial orthogonal direction of the rubber-made molded water stop material which concerns on this invention. 1 is a cross-sectional view in the axial direction of a rubber molded water stop material according to the present invention. The perspective view which shows the example of application of the rubber molded water stop material which concerns on this invention to the gap between the unit wall members which comprise a seawall. (A) is a cross section showing a state in which the rubber molded water-stopping material according to the present invention is pressed from the pair of surfaces constituting the gap and is crushed and is elastically repelled against the pair of surfaces to press the outer peripheral surface. FIG. 4B shows that the rubber molded water-stopping material according to the present invention effectively exerts an elastic repulsive force even when a pair of surfaces constituting the clearance is separated and the clearance is opened, Sectional drawing which shows the state pressed against the said pair of surface. The perspective view which shows the example of application of the rubber molding water stop material which concerns on this invention to the gap between adjacent box culverts. The perspective view which shows the example of application of the rubber molded water stop material which concerns on this invention to the gap between the unit waterway members of a cross-sectional U-shaped waterway. Sectional drawing which shows the interposition arrangement | positioning state in the play of the rubber | gum shaping | molding water stop material which concerns on this invention in FIG. 6, FIG. The manufacturing process figure which outlines the manufacturing method which concerns on this invention. Explanatory drawing which shows an extrusion molding apparatus and a heating apparatus. The disassembled perspective view explaining the head part of an extrusion molding apparatus. Sectional drawing explaining the flow of the rubber material for soft parts in the head part of an extrusion molding apparatus, and the rubber material for hard parts. (A) to (C) are sectional views showing step-by-step manner in which the blowing agent in the rubber material for the soft portion is foamed.

  Hereinafter, an embodiment of a rubber molded waterproof material and a method for producing the same according to the present invention will be described with reference to FIGS. 1 to 13.

≪Structure of rubber molded waterproofing material≫
As shown in FIGS. 1 to 3, a rubber molded water-stopping material 1 (hereinafter simply referred to as a molded water-stopping material 1) according to the present invention has a flexible rod-like shape and is opposed to each other as described later. In the play space formed between the pair of surfaces, it is disposed in a state where it is crushed so as to be orthogonal to the intrusion direction of the intruding water and used for water stoppage.

  As a specific structure, the molded water-stopping material 1 according to the present invention has a structure including a soft part 2 at the center and a hard part 3 covering the outer peripheral part 2a of the soft part 2 in a cross-sectional shape in the direction perpendicular to the axis. The soft portion 2 includes a large number of pores 4 and a sponge-like partition wall 5 separating the pores 4, and an outer peripheral portion 5 a of the partition wall 5 (an outer peripheral portion 2 a of the soft portion 2) of the hard portion 3. It has a structure integrated with the inner periphery 3b. The hard part 3 does not have pores and has a structure having a relatively higher hardness than the soft part 2.

  In other words, the partition wall 5 of the soft part 2 serving as the core layer and the hard part 3 serving as the surface layer have a structure that is seamlessly connected to each other. Strive to achieve both elastic repulsion on the opposing surface.

  The molded water-stopping material 1 according to the present invention includes a convex curved upper surface 1A and a planar bottom surface 1B, and a planar right side surface 1C and a planar left side surface connecting the upper surface 1A and the bottom surface 1B. 1D, and the cross-sectional shape in the direction perpendicular to the axis has a shape like a ridge as a whole. In the present invention, the cross-sectional shape in the direction perpendicular to the axis of the molded waterstop material 1 is not particularly limited as long as it can be interposed and arranged in the play as will be described later, such as a circle, an ellipse, a rectangle, a polygon, etc. Depending on the implementation, the cross-sectional shape may be a combination of the shapes.

  In addition, the height of the molded water-stopping material 1 according to the present invention is slightly longer than the width of the gap between the application locations, and a layer thickness that can exhibit the elastic repulsion force of the hard portion 3 within the height range is secured. It is natural to do.

  Further, the partition wall 5 and the hard part 3 of the soft part 2 are made of a vulcanized rubber obtained by adding a vulcanizing agent such as sulfur to a rubber material and performing a vulcanization process by heating. As the rubber material, chloroprene rubber, styrene butadiene rubber, isoprene rubber, butyl rubber, ethylene propylene rubber, natural rubber, nitrile rubber, urethane rubber, and other polymer materials are used alone or in combination.

  The pores 4 of the soft part 2 are formed by adding a foaming agent to the rubber material and foaming the foaming agent by heating. In the present invention, the amount of the foaming agent added is adjusted so that the pores 4 become independent pores. Details will be described later in the description of the manufacturing method.

  In addition, in the present invention, the partition wall 5 of the soft part 2 is made of vulcanized non-expandable rubber and the hard part 3 is made of water expanded rubber, or the soft part 2 partition wall. 5 and the hard part 3 can be constituted by vulcanized water-expanded rubber.

  Here, the water-swelling rubber is a rubber made of a material obtained by adding a water-absorbing material to the above-described rubber material, and the water-absorbing material absorbs water and expands to increase the volume. As the water-absorbing material, a water-absorbing polymer (sodium polyacrylate) used for disposable diapers, sanitary products, etc. is used, and an appropriate amount is determined according to required performance (expansion rate, time required for maximum expansion, etc.) Add to rubber material. The non-expandable rubber refers to a rubber material in which the above water-absorbing material is not added to the above-described rubber material, and refers to rubber that does not absorb water.

  As will be described later, the molded water-stopping material 1 according to the present invention having the above-described structure collapses the pores 4 of the soft portion 2 by pressing from a pair of opposing surfaces that form a gap, and the whole water-stopping material is crushed. And the integral partition wall 5 of the soft portion 2 and the hard portion 3 cooperate to exert an elastic repulsive force so that the pair of opposing surfaces have their own outer peripheral surface 1a (the outer peripheral surface of the hard portion). 3a) can be pressed to prevent a gap from being formed around itself and to effectively block intrusion water.

  In addition, the partition wall 5 and the hard part 3 of the soft part 2 are made of vulcanized rubber, so that it has high elasticity and high strength, and exhibits the elastic repulsion force.

  Further, by forming the pores 4 of the soft part 2 as independent pores, it is possible to secure partition walls 5 separating the pores 4 to obtain a desired hardness, and to cut off the molded water-stopping material 1. Even when used in a state, the penetration of water from the pores 4 in the cut surface is prevented.

  Further, when the hard part 3 is made of vulcanized water expansion rubber, or when the partition wall 5 of the soft part 2 and the hard part 3 are made of water expansion rubber, as described later, the hard part 3 is particularly hard. The water expansion rubber constituting the portion 3 absorbs intruding water and expands to expand the diameter of the entire molded water stop material, and complements the water stop by the elastic repulsion force.

≪Example of application to the gap between adjacent unit wall members≫
4 and 5 show an example in which the molded water-stopping material 1 according to the present invention is applied to a gap generated at a joint portion between adjacent unit wall members 11 and 11 '. The unit wall member 11 (11 ′) is a precast concrete member (concrete secondary product), and is a member for constructing a seawall or retaining wall by connecting a plurality of the unit wall members 11 (11 ′) on the ground.

  As shown in FIG. 4, the end surface 11a of the unit wall member 11 and the end surface 11'a of the unit wall member 11 'adjacent to the unit wall member 11 are abutted, that is, the end surface 11a of the installed unit wall member 11 is newly added. The end surface 11 ′ a of the unit wall member 11 ′ installed on the wall is abutted, and the formed water stop material 1 cut to an appropriate length is interposed in the gap formed between the end surfaces 11 a and 11 ′ a.

  Preferably, as shown in FIG. 4, the molded water-stopping material 1 is bent in an inverted U shape at the upper end side of the unit wall member 11, 11 ′, and the both end portions of the wall member 11, 11 are bent. It is arranged at the lower end side of ′. The unit wall members 11, 11 'are designed to stop intrusion water (rain water, etc.) entering from the upper side to the lower side, and from the outer surfaces 11b, 11'b side of the unit wall members 11, 11' This is to stop water at two locations against intruding water (seawater, groundwater, etc.) entering the 11′c side. Note that both ends of the molded water-stopping material 1 become cut surfaces, and the soft portion 2 on the cut surface is exposed to water such as rain water or groundwater, but the pores 4 of the soft portion 2 are independent pores. Therefore, water does not penetrate into the molded waterstop material 1.

  Further, the molded water-stopping material 1 is attached in advance by adhering the bottom surface 1B to one end surface 11a of the adjacent unit wall members 11 and 11 'with an adhesive, as shown in FIG. 5 (A). The other end face 11 ′ a is crushed by the other end face 11 ′ a so as to be interposed in the gap 10. In this example, although the example which attaches the molding water stop material 1 to the end surface 11a of the existing unit wall member 11 previously was shown, this invention is not limited to this, The unit wall member 11 'newly installed It is natural that the molded water-stopping material 1 can be attached in advance to the end face 11'a.

  Alternatively, it is optional depending on the implementation to form a groove on one of the end surfaces of the unit wall members 11 and 11 'and attach the molded water-stopping material 1 using the groove.

  Next, based on FIG. 5, the water stop by the molded water stop material 1 interposed and arranged in the gap as described above will be described. FIG. 5 shows only a cross-sectional state of the molded water-stopping material 1 on the outer surface 11b / 11′b side of the unit wall member 11/11 ′ for convenience of explanation.

  As shown in FIG. 5 (A), the molded water-stopping material 1 has an upper surface 1A and an end surface 11a / 11'a of the unit wall members 11/11 'forming the clearance 10 in the clearance 10 having a width L1. The bottom surface 1B is pressed and the left and right side surfaces 1C and 1D are crushed and arranged in a slightly expanded state.

  At this time, as shown in the enlarged view of FIG. 5A, a large number of pores 4 in the soft portion 2 of the molded water-stopping material 1 are crushed, and the entire molded water-stopping material 1 is It is allowed to be crushed by the above pressing. At the same time, the partition wall 5 of the soft portion 2 and the hard portion 3 that are integrated at the same time exert an elastic repulsive force, and the outer peripheral surface 3a of the hard portion 3, that is, the outer peripheral surface 1a of the molded water-stopping material 1 is the end surface 11a. And against the end surface 11'a to prevent a gap from being formed between the end surface 11a and the outer peripheral surface 1a and between the end surface 11'a and the outer peripheral surface 1a, and to prevent the intrusion of water indicated by W in the figure. Effectively stop water.

  Further, as shown in FIG. 5B, the unit wall members 11 and 11 ′ are contracted and deformed due to a change in the air temperature and the like, and the width of the gap 10 between the end surface 11a and the end surface 11′a becomes L2 larger than L1. When the gap 10 is opened, the integrated partition wall 5 of the soft portion 2 and the hard portion 3 cooperate to exert an elastic repulsive force, and the elastic repulsive force causes the pores 4 of the soft portion 2 to function. The outer peripheral surface 1a is pressed by following the spaced end surfaces 11a and 11'a to prevent a gap from being generated between the end surface 11a and the outer peripheral surface 1a and between the end surface 11'a and the outer peripheral surface 1a. Accordingly, the intrusion water indicated by W in the figure can be continuously prevented and the water stopping power can be maintained.

  In addition, in the present invention, at least if the hard portion 3 is made of vulcanized water-expanded rubber, the hard portion 3 made of the water-expanded rubber absorbs the intruding water W to expand and expand its diameter, Therefore, the diameter of the molded water-stopping material 1 as a whole can be increased, and the outer peripheral surface 1a can be strongly pressed against the opposing surfaces 11a and 11'a, and can be reliably used for water-stopping. Further, if the partition wall 5 of the soft part 2 as well as the hard part 3 is made of vulcanized water expansion rubber, the soft part 2 is expanded in diameter together with the hard part 3, and the outer peripheral surface 1a is more firmly formed. It can be pressed against the opposing surfaces 11a and 11'a for water stoppage.

  As described above, in the molded water-stopping material 1 according to the present invention, when the pores 4 of the soft part 2 are crushed, pressing by a pair of opposing end surfaces 11a and 11'a forming the gap 10 is performed. Allow crushing.

  On the other hand, the partition wall 5 of the soft part 2 and the hard part 3 made of vulcanized rubber and integrated with each other cooperate, and specifically, the partition part 5 of the soft part 2 backs up the hard part 3 from the inside and is elastic. Demonstrate resilience. For this reason, the outer peripheral surface 1a can be effectively pressed against the end surfaces 11a and 11'a during a normal time, and water can be stopped as well as following the end surfaces 11a and 11'a which are separated from each other even when the gap 10 is open. Water can be stopped by pressing the outer peripheral surface 1a.

≪Example of application to the gap between adjacent box culverts or between adjacent unit channel members≫
6 and 8 show an example in which the molded water-stopping material 1 according to the present invention is applied to a gap generated at a joint portion between adjacent box culverts 12 and 12 '. The box culvert 12 (12 ′) is a concrete secondary product formed into a rectangular tube shape, and is a member that connects a plurality of them and embeds them in the ground to form a passage, a water channel, a wiring channel, and the like.

  7 and 8 show an example in which the molded water-stopping material 1 according to the present invention is applied to a gap generated in a joint portion between adjacent unit waterway members 14 and 14 '. The unit water channel member 14 (14 ') is a concrete secondary product formed in a U-shaped cross section, and is a member that forms a water channel by connecting a plurality of the unit water channel members 14 (14').

  When the molded water-stopping material 1 according to the present invention is applied between the adjacent box culverts 12 and 12 ′, as shown in FIG. 6, the end surface 12 a of the box culvert 12 is substantially the same as the molded water-proof material 1. A groove 13 extending in an annular shape with a width is formed, the molded water-stopping material 1 is mounted in the groove 13, the end surface 12a is abutted against the end surface 12'a of the adjacent box culvert 12 ', and both box culverts 12 and 12 are placed. Connect ′. Note that no groove is formed on the end face 12'a of the adjacent box culvert 12 '.

  When the molded water-stopping material 1 is mounted in the groove 13, the molded water-stopping material 1 cut into an appropriate length along the annular shape of the groove 13 is inserted into the groove 13 or as shown in FIG. As shown, the molded water-stopping material 1 cut to an appropriate length is molded so as to follow the annular shape of the groove 13, and the end portions are vulcanized and bonded together and inserted into the groove 13. In any case, as shown in FIG. 8, the molded waterproofing material 1 is attached so that the bottom surface 1 </ b> B is in contact with the bottom surface of the groove 13.

  Further, when the molded water stop material 1 according to the present invention is applied between the adjacent unit water channel members 14 and 14 ', as shown in FIG. 7, the end surface 14a having a U-shaped cross section of the unit water channel member 14 is used. A groove 13 extending in the shape of a letter U and having the same width as that of the molded water-stopping material 1 is formed. The molded water-stopping material 1 is attached in the groove 13, and the end surface 14a is connected to the end surface 14 'of the adjacent unit water channel member 14'. Both unit waterway members 14 and 14 'are connected in abutment with a. It should be noted that no groove is formed on the end surface 14'a of the adjacent unit water channel member 14 '.

  When the molded water-stopping material 1 is attached in the groove 13, the molded water-stopping material 1 cut into an appropriate length along the U-shape of the groove 13 is inserted into the groove 13 and shown in FIG. Thus, it attaches so that the bottom face 1B of the molded water stop material 1 may contact the bottom face of the groove | channel 13.

  Therefore, as shown in FIG. 8, the molded water-stopping material 1 includes the bottom surface of the groove 13 included in the box culvert 12 or the unit water channel member 14, and the end surface 12'a of the adjacent box culvert 12 'or the unit water channel member 14'. It is disposed in a state where it is crushed in the play 10 formed between the end face 14'a.

  Further, intrusion water (ground water or the like) entering from the box culvert outer surfaces 12b and 12'b side or the unit channel member outer surfaces 14b and 14'b is blocked, and the box culvert inner surfaces 12c and 12'c side or the unit channel member inner surface 14c. -Blocks intrusion water (water in the water channel) entering from the 14'c side.

  In addition, about the tolerance of the crushing of the molded water-stopping material 1 by the pores 4 of the soft part 2, the exertion of the elastic repulsion force by the integrated partition wall 5 and the hard part 3 of the soft part 2, and the diameter expansion by the water expansion rubber This mechanism is the same as that in the case where the molded water-stopping material 1 is applied to the gap 10 between the adjacent unit wall members 11 and 11 ′ described above, and the description thereof is omitted here.

≪Manufacturing method≫
Next, the manufacturing method of the rubber molded water stop material which concerns on this invention is demonstrated.

  As shown in FIG. 9, the method for producing a rubber molded water-stopping material 1 according to the present invention includes adding the foaming agent together with the vulcanizing agent and the vulcanization accelerator to the rubber material described above, and kneading the soft part. A rubber material for the hard part 3 is prepared by adding a vulcanizing agent and a vulcanization accelerator to the rubber material described above and kneading the rubber material. A step of generating (hard part rubber material kneading step S2), a step of simultaneously extruding the soft part rubber material and the hard part rubber material (two-color extrusion molding step S3), and the extrusion molding A step of foaming the foaming agent in the rubber material for the soft part while vulcanizing the rubber material for the soft part by heating the extruded product and vulcanizing the rubber material for the hard part (vulcanization and foaming step S4) ).

<Rubber material kneading process for soft parts>
First, in the soft part rubber material kneading step S1, a foaming agent is added to the above exemplified rubber material together with a vulcanizing agent and a vulcanization accelerator, and kneaded by a known kneader to produce a soft part rubber material. .

  As the vulcanizing agent, sulfur, organic sulfur-containing compound, metal oxide, metal peroxide, quinone dioxime, modified alkylphenol resin, organic peroxide, diisocyanate, diamine, etc. are used, and the rubber described above. It is used appropriately according to the type of rubber of the material. Examples of the vulcanization accelerator include aldehydes / ammonia derivatives of ammonia derivatives, aldehyde / amines, guanidines, thioureas of carbon disulfide derivatives, thiazoles, sulfenamides, thiurams, dithiocarbamates, xanthates. Vulcanization accelerators composed of components belonging to the above are used, and they are appropriately used depending on the desired acceleration effect. As will be described later, in order to speed up the completion of the vulcanization of the hard part rubber material to the completion of the vulcanization of the soft part rubber material, the addition amounts of the vulcanizing agent and the vulcanization accelerator are adjusted.

  Moreover, as the foaming agent, an inorganic foaming agent such as sodium bicarbonate or ammonia nitrite, an organic foaming agent such as a nitroso compound, an azo compound, or a sulfonyl hydrazide compound is used, and pores formed by the foaming agent are independent pores. The addition amount is adjusted so that

  When the partition wall 5 of the soft part 2 is made of water-expanded rubber, a water absorbing polymer (sodium polyacrylate) or the like is further added and kneaded to produce a soft part rubber material.

<Rubber material kneading process for hard part>
In the hard part rubber material kneading step S2, a vulcanizing agent and a vulcanization accelerator are added to the rubber material described above, and kneaded by a known kneader to produce a hard part rubber material.

  The above vulcanizing agent and vulcanization accelerator are the same as those for the soft part rubber material described above. As described later, the vulcanization of the hard part rubber material is completed and the vulcanization of the soft part rubber material is completed. In order to speed up the process, the addition amount of the vulcanizing agent and the vulcanization accelerator is adjusted.

  In the present invention, depending on the required performance of the rubber molded water-stopping material to be manufactured, the rubber material used for the soft part rubber material is different from the rubber material used for the soft part rubber material as the rubber material used for the hard part rubber material. Includes the use of materials.

<Two-color extrusion process>
Next, in the two-color extrusion molding step S3, as shown in FIGS. 10 to 12, the soft part rubber material 2 ′ generated in the soft part rubber material kneading step S1 and the hard part by the extrusion molding device 21 are used. The rubber material 3 ′ for hard part produced in the rubber material kneading step S2 is extruded at the same time to obtain an extruded product 1 ′.

  As shown in FIGS. 10 to 12, the extrusion molding apparatus 21 includes a head portion 22 that simultaneously extrudes the rubber material 2 ′ for the soft portion and the rubber material 3 ′ for the hard portion, and the head portion 22 has an outlet 22a. And an outer cylinder member 22A having a first inlet 22b, and a connecting cylinder member 22B having a second inlet 22c extending in a direction perpendicular to the axis of the outer cylinder member 22A from a midway portion of the outer cylinder member 22A. The first inlet 22b of 22A is connected to the outlet 23a of the first pipe 23 for transferring the rubber material 2 'for the soft part through the inlet 25c of the inner cylinder member 25 described later, and the second inlet of the connecting cylinder member 22B. 22c is connected to the outlet 24a of the second pipe 24 for transferring the hard part rubber material 3 '.

  In addition, the head portion 22 includes an inner cylinder member 25 that is nested in the outer cylinder member 22A, and a die member 26 that is attached to an outlet 25a of the inner cylinder member 25 via a cylindrical fitting member 32. The inner cylinder member 25 has a structure having a first guide groove 25b on the outer peripheral surface for guiding the hard portion rubber material 3 'flowing from the connection cylinder member 22B side to the die member 26 side.

  The die member 26 includes a disc-like first die member 26A and a disc-like second die member 26B fitted to the back surface of the first die member 26A. An annular convex wall 28 having one extrusion port 29 formed therein, a second guide groove 27 communicating with the first guide groove 25b formed on the surface of the second die member 26B, and a second extrusion port 30 therein. It is the structure which stands up. Therefore, the die member 26 has a double extrusion port of a first extrusion port 29 and a second extrusion port 30 opened inside the first extrusion port 29.

  Thus, when the soft part rubber material 2 'is introduced into the head part 22 having the above structure through the first pipe 23 and the hard part rubber material 3' is introduced through the second pipe 24, as shown in FIG. Further, the soft part rubber material 2 'flows into the inner cylinder member 25 and is pushed out from the second extrusion port 30 of the die member 26 through the outlet 25a of the inner cylinder member 25. At the same time, the hard part rubber material 3' is Extruded from the first extrusion port 29 of the die member 26 through the first guide groove 25b of the inner cylinder member 25 and the second guide groove 27 of the second die member 26B, the outer peripheral portion of the soft part rubber material 2 'is used for the hard part. The extruded product 1 ′ covered with the rubber material 3 ′ is continuously carried out through the outlet 22 a of the head portion 22.

<Vulcanization and foaming process>
Next, the extruded product 1 'obtained by the two-color extrusion molding step S3 described above is continuously processed in the vulcanization and foaming step S4.

  In this step, as shown in FIG. 10, the extruded product 1 'unloaded from the extrusion molding device 21 passes through a heating device 31 following the extrusion molding device 21 while being transferred by a known belt conveyor. Do. The heating device 31 heats the extruded product 1 ′ with hot air inside.

  When the heating by the heating device 31 is started, as shown in FIG. 9, the vulcanizing agent and the vulcanization accelerator in the soft part rubber material 2 'and the hard part rubber material 3' cause a crosslinking reaction. Sulfuration is started (S41).

Next, the foaming agent in the soft part rubber material 2 ′ starts to foam (S42), and as shown in FIG. 13, the pores 4 are gradually formed by the foaming gas generated by the foaming, while the extruded product 1 ′. Is deformed in the direction perpendicular to the axis, that is, the height of the extruded product 1 ′ is gradually increased from H1 to H2. The foaming gas remains in the pores 4.

And by adjusting the addition amount of the vulcanizing agent and the vulcanization accelerator added to the rubber material 2 'for the soft part and the rubber material 3' for the hard part in the kneading steps S1 and S2 described above, the hard part After completion of the vulcanization of the rubber material 3 '(S43), the vulcanization of the soft rubber material 2' is completed (S44). Also, for the soft parts of the rubber material 2 'foaming of the foaming agent in the said soft part rubber material 2' it becomes impossible and at the same time the vulcanization is complete naturally completed (S44).

As described above, the vulcanization completion of the hard part rubber material 3 '(S43) is made earlier than the vulcanization completion of the soft part rubber material 2' (S44), so that the foaming agent in the soft part rubber material 2 'is foamed. While suppressing the deformation of the extruded product 1 ′ in the axial direction due to the pores 4 generated in the step 4, and preventing the extruded product 1 ′ from hardening in a meandering state, As shown in FIG. 2 and FIG. 13 (C), the outer peripheral portion 5a of the partition wall 5 and the inner peripheral portion 3b of the hard portion 3 that separate the pores 4 of the soft portion 2 are integrated. Can be produced.

The deformation in the direction perpendicular to the axis of the extruded product 1 ′ due to the pores 4 generated by foaming of the foaming agent in the soft part rubber material 2 ′ shown in FIG. 13 is the axial direction of the extruded product 1 ′. It is performed earlier than the above deformation, and is not affected by the completion of the early vulcanization of the hard part rubber material 3 'described above.

  As described above, according to the rubber molded water-stopping material 1 according to the present invention, the rubber molded water-stopping material 1 is interposed in a properly crushed state in the gap, and is interposed between the pair of opposed surfaces constituting the gap. The outer peripheral surface 1a can be pressed by elastic repulsive force to prevent a gap from being formed around itself, and intrusion water can be effectively blocked.

  Further, both the partition wall 5 of the soft part 2 as the core layer and the hard part 3 as the surface layer covering the outer peripheral part 5a of the partition wall 5 are made of vulcanized rubber, thereby providing high elasticity and high strength, and elastic repulsion force. Make sure to show off.

  Furthermore, since the outer peripheral portion 5a of the partition wall 5 of the soft portion 2 and the inner peripheral portion 3b of the hard portion 3 covering the outer peripheral portion 5a of the partition wall 5 are integrated, the hard portion 3 is integrated with the soft portion 2. The partition wall 5 backs up from the inside and effectively exhibits the elastic repulsion force.

  Moreover, according to the manufacturing method of the rubber molded waterproof material which concerns on this invention, the rubber molded waterproof material 1 which concerns on the said this invention can be effectively manufactured with a simple method.

  DESCRIPTION OF SYMBOLS 1 ... Rubber molding water stop material, 1A ... Upper surface, 1B ... Bottom surface, 1C ... Right side surface, 1D ... Left side surface, 1a ... Outer peripheral surface, 1 '... Extrusion molding, 2 ... Soft part, 2a ... Outer part, 2 '... Soft part rubber material, 3 ... Hard part, 3a ... Outer peripheral surface, 3b ... Inner peripheral part, 3' ... Rubber material for hard part, 4 ... Pore, 5 ... Partition wall, 5a ... Outer peripheral part, 10 ... Gap, DESCRIPTION OF SYMBOLS 11 ... Unit wall member, 11a ... End surface (opposite surface), 11b ... Outer surface, 11c ... Inner surface, 11 '... Adjacent unit wall member, 11'a ... End surface (opposite surface), 11'b ... Outer surface, 11'c ... inner surface, 12 ... box culvert, 12a ... end face (opposing face), 12b ... outer face, 12c ... inner face, 12 '... adjacent box culvert, 12'a ... end face (opposing face), 12'b ... outer face, 12' c ... inner surface, 13 ... groove, 14 ... unit waterway member, 14a ... end face (opposing surface), 14b ... outer surface, 14 ... inner surface, 14 '... adjacent unit channel member, 14'a ... end face (opposing surface), 14'b ... outer face, 14'c ... inner face, 21 ... extrusion molding device, 22 ... head part, 22A ... outer cylinder member , 22B ... connecting cylinder member, 22a ... outlet, 22b ... first inlet, 22c ... second inlet, 23 ... first pipe, 23a ... outlet, 24 ... second pipe, 24a ... outlet, 25 ... inner cylinder member, 25a ... exit, 25b ... first guide groove, 25c ... inlet, 26 ... die member, 26A ... first die member, 26B ... second die member, 27 ... second guide groove, 28 ... annular convex wall, 29 ... first Extrusion port, 30 ... second extrusion port, 31 ... heating device, 32 ... cylindrical fitting member, W ... intrusion water, L1 ... width between normal play, L2 ... width between open play, H1 / H2 ... extrusion Height of molded product, H3: Height of a rubber molded waterproofing material.

Claims (4)

A rod-shaped rubber molded water-stopping material that is disposed in a state of being pressed and crushed by a pair of surfaces formed between a pair of opposing surfaces, and that stops the intrusion of water. The cross-sectional shape in the orthogonal direction has a structure having a soft part at the center and a hard part covering the outer peripheral part of the soft part, and the soft part separates each of the pores from many pores formed as independent pores. A sponge-like partition wall and a structure in which the outer peripheral portion of the partition wall is seamlessly integrated with the inner peripheral portion of the hard portion, and the partition wall of the soft portion and the hard portion are made of vulcanized rubber. The pores which are independent pores of the soft part allow the crushing by the pressing while preventing water from entering from the pores and elastically repelling the hard part by backing up the partition of the soft part. That of a pair of faces Rubber molded water stopping material, characterized in that press the outer peripheral surface of the rigid portion to Re.

Rubber molded water stopping material according to claim 1, characterized by being configured with water inflated rubber vulcanizing septum and the hard part of the soft portion. The soft portion of the partition wall is made of a non-expanded rubber vulcanized rubber molded water stopping material according to claim 1, characterized by being configured with water inflated rubber vulcanizing the rigid portion. A method for producing a rod-shaped rubber molded water-stop material having a structure including a soft part at the center in a cross-sectional shape in the direction perpendicular to the axis and a hard part covering the outer peripheral part of the soft part, the soft material containing a foaming agent The rubber material for soft part and the rubber material for hard part are extruded at the same time by adjusting the amount of vulcanizing agent and vulcanization accelerator added to the rubber part material and hard part rubber material respectively. In the step of heating and vulcanizing the molded extrudate, the vulcanization completion of the rubber material for the hard part is made earlier than the vulcanization completion of the rubber material for the soft part, and the foaming agent in the rubber material for the soft part A partition that appropriately integrates the rubber material for the soft part and the rubber material for the hard part while suppressing the deformation in the axial direction of the extruded product due to the pores generated by foaming of the soft part, and separates the pores of the soft part And the inner periphery of the hard part Method for producing a rubber molded water stopping material, characterized in that the integral.