JP2007046415A - Sealant for cutting off water from joint and method of cutting off water from joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealant for cutting off water from a joint easily fitted into a joint groove with a rather small pushing pressure, enabling an increase in the width of an elastic body in the joint groove without a special pushing operation, and providing a high water cutoff effect by allowing it to match the variation of the width dimensions of the joint groove. <P>SOLUTION: This sealant for cutting off water from a joint comprises the long elastic body 10A formed to be fitted to the joint groove 102 and an width increased material 20A stored in a storage groove 13 formed inside the elastic body and causing an action to press-fit the side face of the elastic body against the side wall of the joint groove after the elastic body is fitted to the joint groove. The width increased material storage groove 13 is formed in a groove opening toward the bottom of the joint groove. A part or all of the width increased material 20A formed to be partly or totally fitted to the groove is formed of a water-swelled rubber. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a joint water-stopping sealing material for water leakage countermeasures, particularly for water leakage countermeasures for lining concrete structures such as tunnels, and a joint water-stopping method using the sealing material.

  Generally, a concrete structure such as a tunnel cracks over time, leaks through the cracks, and can cause great damage if left untreated. In addition, joints are formed at the joints between the segments of the concrete structure formed by connecting the segments, and the joints must be treated so that water leakage does not occur. Therefore, there are many constructions aimed at preventing water leakage at joints.

  As a sealing material for joint water-stopping used for the purpose of preventing such water leakage, the one disclosed in Patent Document 1 has been proposed. For example, when the concrete structure is a tunnel 100 as shown in FIG. 8, the sealing material is a long elastic member that is fitted into a joint groove 102 formed by cutting an inner surface portion of a portion where a crack 101 of the tunnel is generated. A main body and a zipper that is press-fitted into a zipper engagement groove formed in the longitudinal direction in the elastic main body. The zipper is inserted into the joint groove after the elastic material body is fitted into the joint groove, and the elastic body is pushed sideways by the press-fitting. As a result, the elastic body is pressed against the side surface of the joint groove. In this way, a water-stopping action is provided by the sealing material.

  The above zipper has a zipper body having a substantially round shape when viewed in cross section. The gap width of the zipper body insertion opening of the zipper engagement groove is smaller than the diameter of the zipper body so that the zipper body after being pressed into the zipper engagement groove of the elastic body does not inadvertently leave the zipper engagement groove. It is made with dimensions.

  In order to press-fit the zipper body into the zipper engagement groove, the front part of the zipper body is applied to the insertion port, and the rear part of the zipper is struck with a hammer or the like to apply a pressing pressure to the zipper. In response to this pressing pressure, the zipper body pushes open the insertion port and enters the zipper engaging groove.

  Since the zipper body has a larger diameter than the zipper engagement groove, the zipper body acts to push the elastic body sideways when it is press-fitted into the zipper engagement groove. The formed water-stopping rib is pressed against the side surface of the joint groove to bring about a water-stopping action, and further, the water-stopping action is effectively maintained by the residual stress generated in the elastic body and the zipper body.

JP 2002-194332 A

  However, according to the conventional joint water sealing material configured to push the insertion port through the zipper body and allow the insertion port to pass therethrough, when the zipper body is press-fitted into the zipper engagement groove, When the zipper body passes through the insertion opening, the expansion of the elastic body is maximized. After the passage, the width of the elastic body is slightly reduced, so that there is a problem that the water stop effect is reduced by the reduction. . Further, in order to spread the insertion opening, it is necessary to apply a considerable pressing pressure to the zipper, and the workability is not good.

  There are attempts to increase the diameter of the zipper body in order to reduce the influence of the reduction in the width of the elastic body, or to increase the gap width of the insertion port so that the pressing force to be applied to the zipper body can be reduced. However, in the former case, the workability of the pushing operation is further deteriorated because it acts in the direction of increasing the necessary pushing pressure, and in the latter case, the zipper body is easily detached from the zipper engaging groove. The existence of such a trade-off factor is difficult to make the shape and dimensions of the zipper body and the insertion port satisfactory, and it is difficult to use the conventional sealing material for water stop. I'm making things.

  Further, regarding the joint groove, even if it is a continuous joint groove, the width dimension usually varies to some extent from place to place. Since the widening action of the zipper body is substantially uniform over the entire length, the adaptability to variations in the joint groove width dimension is low, resulting in variations in the contact pressure of the elastic body on the side surfaces of the joint grooves. It has not reached a satisfactory construction result.

  Therefore, according to the present invention, the sealing material for water-stopping can be inserted into the joint groove with a small pressing pressure, and the expansion of the elastic body in the joint groove does not require a pressing operation to the widening member. Further, it is intended to provide a high water-stopping effect by adapting to the variation in the width dimension of the joint groove.

  In order to achieve the above object, the invention according to claim 1 of the present invention is formed by cutting a crack occurrence part of a concrete structure or formed at a joint part of a concrete structure segment. A sealing material for joint sealing water applied to a long elastic body formed so as to fit into the joint groove, and accommodated in a housing groove formed inside the elastic body, the elastic And a widening material that has a function of pressing the side surface of the elastic main body against the side surface of the joint groove after the main body is fitted into the joint groove, wherein the widening material receiving groove is the joint groove. The widening material is partly or entirely formed of a water-swelling material or a water-swelling material, and the widening material is mostly or entirely formed in the widening material-receiving groove. It is characterized by being fitted That.

  According to the first aspect of the present invention, the joint sealing water sealing material is fitted into the joint groove by first applying water to the widening member, and then partially or entirely accommodating the elastic main body. The elastic body containing the wet widening material is then inserted into the joint groove with the widening material inside, and the elastic main body holding the wet widening material is inserted into the joint groove. At this time, since the expansion of the widening material has not yet started, the elastic main body itself maintains the initial width dimension, and therefore the elastic main body can be easily inserted into the joint groove without requiring a large pushing force. be able to.

  After the sealing material is fitted into the joint groove, the wetted widening material gradually expands with water and expands its width dimension. The expansion of the width dimension of the widening material brings about the widening of the elastic main body and the action of pressing the side surface of the elastic main body against the side surface of the joint groove. Water entering the joint groove from the crack of the concrete structure promotes further expansion and widening of the widening material.

  The water-expanding widening material provides a flexible widening to the elastic body. In other words, even if there is a variation in the width dimension of the continuous joint groove from place to place, such a dispersion is sufficiently compensated by the flexible water expansion action of the widening material, and any part of the side face of the joint groove is Sufficient contact pressure of the elastic body is provided, thus providing a reliable and effective water stop action over the joint groove.

  The width dimension of the widening material is made smaller than the width dimension of the widening material accommodation groove so that the work of fitting the widening material into the accommodation groove is facilitated, but the water expansion of the widening material is transmitted to the elastic body without play. In order to contribute to the widening of the elastic body without waste, it is preferable that the dimensions of both are as close as possible.

  As described in claim 2, by making a part or all of the widening material with water-expandable rubber, it is possible to effectively bring about sufficient widening of the elastic body by application of water.

  The presser plates are brought into contact with the top surface of the widening material facing the bottom of the widening material receiving groove and the bottom end surface of the widening material facing the bottom of the joint groove, respectively. In both sides of the material, it extends in a direction substantially perpendicular to the direction of expansion of the widening material and is connected to each other by a number of wires arranged at a predetermined interval in the direction of expansion of the widening material. If the expansion of the widening material in the direction in which the elastic body is expanded is restricted, the expansion that generates a force in the direction of pushing the elastic body out of the joint groove is converted to a direction that causes the elastic body to widen, and therefore the side surface of the joint groove The pressure contact force of the elastic main body to the water increases, and the water stop effect is further improved.

  In order to achieve the above-mentioned object, the invention of the method according to claim 4 of the present invention is a long elastic body formed so as to fit into a joint groove and having a widening material accommodation groove formed in the longitudinal direction. And a water-swellable or water-swellable widening material fitted in the widening material accommodation groove, and the widening material in a state where water is adhered to the surface of the widening material. The elastic body is inserted into the joint groove, and the elastic body is inserted into the joint groove in a state where the widening material in the wide member housing groove faces the bottom of the joint groove.

  The widening material is preferably made of water-swellable or water-swellable rubber or made of a material containing water-swellable or water-swellable rubber as a main part.

  The adhesion of water to the surface of the widening material is performed by immersing the widening material in water in a water tank or by spraying water on the surface of the widening material with a sprayer.

  According to the present invention, it is possible to perform the fitting of the sealing material for joint sealing water into the joint groove by an extremely simple work, and after the fitting, no artificial work for widening the elastic body is performed. Therefore, it is extremely excellent in workability and workability, and a high-quality water-stopping action is provided evenly over the entire joint groove without being affected by variations in joint groove dimensions.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view showing a part of an elastic main body 10A which is a component of a sealing material for joint water sealing according to the present invention. The elastic body 10A is made of, for example, chlorobrene rubber, ethylene propylene copolymer (EPM) or ethylene propylene terpolymer (EPDM).

  The elongated elastic body 10A has a substantially rectangular cross section, and a plurality of water-stopping ribs 11 extending in the longitudinal direction are formed in parallel on the side surface. Further, the elastic main body 10A is formed with a widening material accommodation groove 13 having a substantially rectangular cross section that opens in the bottom surface 12 and extends in the longitudinal direction.

  FIG. 2 is a perspective view showing a part of the widening material 20A, which is a component of the sealing material for joint water sealing according to the present invention. The cross-section of the widening material 20A is substantially rectangular, the width dimension is slightly smaller than the width dimension of the widening material accommodation groove 13, and the height dimension is somewhat larger than the depth dimension of the widening material accommodation groove 13. ing.

  The widening material 20A is basically manufactured using water-expandable rubber as a material. However, the widening material 20A may be manufactured using a combination of water-expandable rubber and normal rubber in addition to the case of manufacturing the entirety with water-expandable rubber. Good. For example, the widening material 20A may be divided into an upper part and a lower part in the height direction, the upper part may be formed of water-expandable rubber, and the lower part may be formed of ordinary rubber. It may be formed of rubber, and the intermediate layer may be formed of water-expandable rubber that is relatively thicker than the upper and lower layers.

  The water-swellable rubber is preferably a polyether-type polyurethane elastomer that is extremely long-term stable and resistant to hydrolysis. The optimum expansion coefficient and thickness of the water-expandable rubber can be selected by calculation based on the dimensions of the elastic body 10A. The standard of the contact pressure between the elastic main body 10A to be obtained by the water expansion of the water-expandable rubber and the side surface of the joint groove is about 0.2 to 0.5 MPa as providing a good water stop action.

  Although the widening member 20A itself provides the desired action, FIG. 2 shows an embodiment in which the expansion action of the widening member 20A works more effectively. As will be apparent from the following description, the widening member 20A has a top surface facing the bottom portion 13a of the widening member accommodation groove 13 and a bottom end surface facing the bottom portion 102a of the joint groove 102 in the actual action state. However, as shown in the figure, presser plates 21 and 22 are brought into contact with the top surface and the bottom end surface, respectively, and these presser plates are orthogonal to the longitudinal direction of the widening material on both sides of the widening material 20A. The wires 23 are stretched in the direction and arranged at predetermined intervals so that the distance between them is maintained constant.

  The presser plates 21 and 22 are made of a corrosion-resistant metal such as stainless steel or a plastic material, and the wire is made of a corrosion-resistant wire. However, presser plates and wires made of other materials may be used. The thickness of the presser plates 21 and 22 is made as small as possible so that the presser plates can be similarly deformed according to the bending of the widening member 20A. The thickness of the wire rod 23 and the interval between the wire rods are selected so as not to inhibit the lateral expansion of the widening member 20A.

  FIG. 3 shows another embodiment of the sealing material for joint sealing water according to the present invention. The figure shows a cross section of the elastic body 10B of the sealing material and the widening material 20B accommodated in the widening material accommodation groove 13b of the elastic body. As is clear from the figure, the widening material accommodation groove 13b is shown in FIG. The groove width gradually increases from the mouth toward the bottom, that is, the groove side surface of the receiving groove 13b has a taper shape that widens toward the bottom, and the widening member 20B has a shape substantially similar to the receiving groove 13b. ing.

  The elastic body 10B and the widening material 20B are made of the same material as those of the above-mentioned 10A and 20A, the rib 11 is formed on the elastic body 10B in the same manner, and the widening material 20B is formed in a layered manner as described above. May be. Further, similarly to the above, the expansion in the height direction may be suppressed by the presser plate and the wire.

  According to this embodiment, the degree of water expansion in the width direction is increased as compared with the widening member 20A having a uniform width dimension as shown in FIG. Greater contact pressure is provided.

  However, the desired effect can also be brought about by a combination of the accommodating groove 13b having a tapered side surface and the widening member 20A having a uniform width as shown in FIG.

  Next, with reference to FIGS. 4-7, the joint water stop method using said sealing material for water stop is demonstrated. The following description is for the case of using the water sealing materials 10A and 20A shown in FIG. 1 and FIG. 2, but the case of using the water sealing materials 10B and 20B shown in FIG. Is true.

  First, the widening material 20A constrained by the presser plates 21 and 22 and the wire 23 is immersed in water or impregnated with water by spraying, and the side surface of the joint groove 102 or the elastic main body 10A. Adhesive is applied to the side surfaces (rib portions) of both sides or both of these side surfaces. As the adhesive, an epoxy adhesive having a high elastic performance or a specially modified silicon epoxy resin is used.

  Next, the widening member 20A equipped with the presser plates 21 and 22 and the wire 23 is partially or wholly inserted into the widening member accommodation groove 13 of the elastic body 10A, and the elastic member 20A thus holds the widening member 20A. As shown in the perspective view of FIG. 4 and the enlarged scale sectional view of FIG. 5, the main body 10A is sequentially inserted from the end into the joint groove 102 with the widening member 20A inside, and then shown in FIG. Thus, it is completely fitted in the joint groove. When the elastic main body 10A is pushed into the joint groove 102, the water expansion of the widening member 20A has not started. Therefore, the insertion of the elastic main body 10 into the joint groove 102 is extremely simple without requiring any pressure input. be able to. When the elastic main body 10 is pushed into the joint groove 102, the adhesive applied to the side surface of the joint groove enters the gap between the ribs.

  Thereafter, substantial water expansion of the widening material 20A starts and the expansion proceeds with time according to the expansion coefficient of the water expansion rubber to be used. However, the widening material 20A is moved in the height direction by the press plates 21, 22 and the wire 23, that is, By being restrained in the depth direction of the joint groove 102, as shown in FIG. 7, the water expansion of the widening member 20A proceeds only to the side, and the expansion of the widening member 20A to the side is the elastic body. 10A widening is promoted, and the rib 11 on the side surface of the elastic body is strongly pressed against the side surface of the joint groove 102. In this way, the rib 11 pressed against the side surface of the joint groove and the above-described adhesive cause a perfect water-stopping action of the joint. At this time, there are some unevenness on the side surface of the joint groove, Even if there is some variation or fluctuation in the joint groove width dimension in each direction, the water expansion of the widening material can widen the elastic body 10A so as to replenish or supplement them, A perfect water-stopping effect is obtained over the entire length of the material. And by the expansion restraint in the height direction of the widening material 20A or the joint groove depth direction by the press plates 21, 22 and the wire 23, the action of force that pushes the elastic body 10A out of the joint groove 102 does not occur at all. The function of the water expansion rubber can be maximized as a widening material.

  The expansion of the widening material 20A is promoted or increased by water entering from the crack 101, thereby enhancing the water stop effect.

  As shown in FIG. 7, the sealing material for water stop according to the present invention installed in the joint groove as described above brings a smooth inner surface to the concrete structure 100.

  In the water sealing material fitting step, when the widening member 20A is inserted into the accommodation groove 13 of the elastic main body 10A, the surface of the widening member 20A is wetted. It takes time to expand the water. Therefore, it is preferable that a water-stopping action is initially provided to the joint until the widening member 20A acts reliably.

It is a fragmentary perspective view of the elastic main body as a component of the sealing material for joint sealing water by this invention. It is a fragmentary perspective view which shows the widening material as a component of the sealing material for joint sealing water by this invention with the incidental member. It is a cross-sectional view of an elastic main body and a widening material as components of another sealing material for joint water sealing according to the present invention. It is a perspective view which shows one condition of the process of fitting the joint sealing water sealing material shown in FIG. 1 and FIG. 2 in the joint groove formed in the concrete structure. FIG. 5 is a cross-sectional view of a joint water sealing material and a concrete structure in the state of FIG. 4. FIG. 6 is a cross-sectional view similar to FIG. 5, showing a state in which the joint sealing water sealing material has been fitted into the joint groove. FIG. 6 is a cross-sectional view similar to FIG. 5, showing a state in which the widening material is water-expanded and the elastic body is widened. It is a partial perspective view which shows the tunnel as a concrete structure which formed the joint groove in the crack generation | occurrence | production location.

Explanation of symbols

10A, 10B Elastic body 11 Rib 12 Bottom surface 13, 13b Widening material accommodation groove 20A, 20B Widening material 21, 22 Holding plate 23 Wire material 100 Concrete structure 101 Crack 102 Joint groove

Claims (4)

A sealing material for joint water sealing applied to a joint groove formed by cutting a crack occurrence part of a concrete structure or formed at a joint part of a concrete structure segment, and fitted into the joint groove. The elastic body is housed in a housing groove formed inside the elastic body and the elastic body is fitted into the joint groove, and then the side surface of the elastic body is attached to the joint groove. In the sealing material for joint water-sealing having a widening material that brings the action of pressing against the side surface,
The widening material accommodation groove is a groove that opens toward the bottom of the joint groove,
A part or all of the widening material is formed of a water swelling material or a water swelling material,
Furthermore, the said widening material is fitted in the said widening material accommodation groove | channel most or the whole, The sealing material for joint water stop characterized by the above-mentioned.   The part or all of the said widening material is a product made from water expansion rubber, The sealing material for joint sealing water of Claim 1 characterized by the above-mentioned. In the widening material, presser plates are brought into contact with the top surface facing the bottom of the widening material accommodation groove and the bottom end surface facing the bottom of the joint groove,
Both top plates of the top surface and the bottom end surface extend in a direction substantially orthogonal to the widening material stretching direction on both sides of the widening material, and are formed by a large number of wires arranged at predetermined intervals in the widening material stretching direction. The joint material sealing seal material according to claim 1 or 2, wherein the joint material is connected to each other, and expansion of the widening member in a direction to widen a distance between the presser plates is constrained by the connection. A long elastic main body formed so as to fit into the joint groove and having a widening material accommodation groove formed in the longitudinal direction, and a water-swellable or water-expandable widening material fitted in the widening material accommodation groove. Use the sealing material for joint water sealing,
Inserting the widening material into the widening material accommodation groove with water attached to the surface,
A joint water-stopping method, wherein the elastic main body is fitted into a joint groove in a state where the widening material in the widening material accommodation groove faces the joint groove bottom.

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