JP2007056462A - Water-sealing joint structure, water sealing structure and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water-sealing joint structure for water-sealing a joint between secondary products of concrete, which can prevent a great displacement to avoid a large step or groove, and which can suppress an increase in cost. <P>SOLUTION: This joint structure is used for water-sealing a gap between the first secondary product 7A of concrete and the second secondary product 7B of concrete. The joint structure comprises a first water-sealing material 5 which is at least partially embedded in the secondary product 7A, and a second water-sealing material 1 which is at least partially embedded in the secondary product 7B. A recess 25 is formed in the material 5 inside the secondary product 7A; and a protrusion 1a is formed on the material 1, and fitted into the recess 25. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a water-stop joint structure, a water-stop structure, and a manufacturing method thereof, and can be used, for example, as a flexible water-stop material for joints of concrete secondary products prepared in advance in an underground structure.

For example, Patent Document 1 discloses a water-stopping material for joint parts for a concrete secondary product prepared in advance.
JP-A-11-81496

  For example, a core material 14 as shown in FIG. 9 is formed of a sponge, and a non-vulcanized butyl rubber material 15 for improving the adhesion to the concrete interface is covered to make a water stop material. The water stop material 16 is a water-expandable water stop material that expands when it comes into contact with water. For example, a secondary concrete product (hereinafter referred to as a “PC box”) of an underground structure is tension-connected and rigidly joined by tension bars 17 continuously from several to several tens as shown in FIG. Each adjacent joint 18 has a structure that does not follow the displacement.

  When displacement is expected, stretchable flexible joint devices 19 and 20 as shown in FIG. 11 are installed for every fixed amount of tension in the PC box, and the displacement is collectively collected at the flexible joint device. Absorbing structure.

  In order to follow the displacement by a conventional method, as described above, there is a method of installing elastic flexible joint devices 19 and 20 as shown in FIG. 11 at regular intervals. However, since displacements in a certain number of PC boxes are collectively absorbed by the joint devices 19 and 20, the amount of displacement of the flexible flexible joint devices 19 and 20 must be increased. Accordingly, the displacement concentrates on the place where the flexible joint devices 19 and 20 are installed, and the displacement increases.

  If it is within the displacement range of the flexible joint devices 19, 20, the inflow of water pressure can be prevented. However, at the same time, a large step h or groove w is generated between adjacent PC boxes at the joint device installation site, as shown in FIG. Due to the level difference h and the groove w, there is a possibility that the facilities installed inside may be hindered, or in the worst case, the equipment may be damaged and become unusable. In addition, when the inside is a human road, there may be cases where walking is hindered.

  Further, in order to install the elastic flexible joint devices 19 and 20, the PC box joint portion corresponding to the installation site must be specially formed into a specific shape capable of installing the joint device, In addition, a complicated construction process is required on site, and the construction cost is high.

  An object of the present invention is to provide a waterproof joint structure that is capable of preventing joints between concrete secondary products, and that can prevent large displacements, that is, generation of large steps and grooves, and can also suppress costs. That is.

The invention according to the first aspect is a joint structure for stopping the gap between the first concrete secondary product and the second concrete secondary product,
A first water stop material at least partially embedded in the first concrete secondary product; and a second water stop material at least partially embedded in the second concrete secondary product. In the first concrete secondary product, a recess is formed in the first water-stopping material, a protrusion is formed in the second water-stopping material, and the protrusion is inserted into the recess. The present invention relates to a waterproof joint structure.

The invention according to the second aspect is a water-stopping structure used for a joint structure for water-stopping a gap between concrete secondary products,
A water stop material, at least part of which is embedded in the concrete secondary product, is provided, and a recess is formed in the water stop material in the first concrete secondary product.

The invention according to the third aspect is a water-stopping structure used for a joint structure for water-stopping a gap between concrete secondary products,
A water stop material at least partially embedded in the concrete secondary product is provided, and the water stop material is provided with a protruding portion from the concrete secondary product.

The invention according to the fourth aspect is a method for producing a water stop device for use in a joint structure for water stopping a gap between concrete secondary products,
A concrete secondary product is formed by placing concrete so that the water stop material is immersed in the mold with the water stop material fixed to the mold, and solidifying the concrete. It is characterized by integrating the water-stopping material and then removing the formwork from the concrete secondary product.

  Conventionally, a certain number of concrete secondary products (for example, PC boxes) are arranged, and large displacement elastic joint devices 19 and 20 are installed at regular intervals. On the other hand, in this invention, the 1st water stop material which has a recessed part, and the 2nd water stop material which has a protrusion part are embed | buried in the concrete secondary product which opposes. Then, when the opposing concrete secondary product is tensioned and bonded, the protrusion of the second water-stopping material is inserted into the concave portion of the first water-stopping material, thereby providing water-stopping and displacement followability. In particular, the present invention has been achieved.

  It has also been found that with this water-stop joint structure, if there is a displacement that increases the distance between the opposing concrete secondary products, the protrusion can be pulled out from the recess to follow the displacement. Furthermore, it was also found that even when there is a displacement in the direction in which a step is generated between opposing concrete secondary products, the protrusion is pulled out from the recess and bent to follow the step displacement. And even if a protrusion part followed displacement in this way, it turned out that the part in which the protrusion part in a recessed part is inserted maintains the water-stopper, since the force of a deformation | transformation / compression acts.

  And since installation of such a water stop material is simple compared with the water stop structure as shown in FIG. 11 and FIG. 12, and construction is easy, displacement is increased by increasing the number of installation locations. Absorption can be dispersed. Thereby, since the displacement applied to one place becomes a small amount, the influence on the internal facilities and the concrete secondary product itself can be minimized. Even if the number of installations is increased, the individual waterstop materials are small and the structure is simple, so the production cost and construction cost are low.

  According to the fourth aspect of the invention, the concrete is placed by placing concrete so as to immerse the water-stopping material in the mold with the water-stopping material fixed to the mold, and solidifying the concrete. The next product is molded and the concrete secondary product and the waterstop material are integrated, and then the mold is removed from the concrete secondary product. Accordingly, as described above, since the water-stopping material can be easily molded in a state of being fixed to the concrete secondary product, it is not necessary to install the water-stopping material on the concrete secondary product on site.

  A concrete secondary product is a concrete product formed by solidifying ready-mixed concrete in a factory in advance. It means a segment (PC box, etc.) used for the construction of a concrete structure applied in the civil engineering and construction fields, such as a box culvert, a U-shaped waterway, and a water blocking wall.

Fig.1 (a), (b) is sectional drawing which shows typically each water stop material embed | buried under each concrete secondary product.
In the water stop structure 22 of FIG. 1A, the first water stop material 5 is embedded in the first concrete secondary product 7A. 22a is a buried hole. For example, a ring-shaped protrusion 6 is formed on the outer peripheral surface of the water-stopping material 5, thereby preventing the water-stopping material 5 from being pulled out from the concrete. A recessed portion 25 is formed in the water blocking material 5, and the recessed portion 25 is inside the concrete secondary product 22.

  In the water stop structure 23 shown in FIG. 1B, the base 1b of the second water stop material 1 is embedded in the embedded hole 23a of the second concrete secondary product 7B. The flat anchor portion 3 of the water blocking material 1 is embedded in the concrete secondary product 23, and a ring-shaped water blocking material 2 is further interposed between the outer peripheral surface of the water blocking material 1 and the concrete. By embedding the anchor portion 3, the water stop material 1 is not easily pulled out from the concrete secondary product 23. A small-diameter portion 4 is formed at the tip of the protruding portion 1 a of the water-stopping material 1, whereby the protruding portion 1 a of the water-stopping material 1 is easily inserted into the recess 25.

  Here, it is preferable that the diameter of the front end portion 4 of the protruding portion 1a of the second water-stopping material is not more than 0.95 times the inner diameter W1 of the concave portion from the viewpoint of easy insertion into the concave portion. On the other hand, the diameter of the protruding portion 1a other than the tip portion 4 is preferably large from the viewpoint of water stopping performance after insertion, specifically, preferably w1 or more, and 1.05 times w1. It is still more preferable that it is above. As illustrated in FIG. 1B, the outer peripheral surface of the projecting portion of the second water-stopping material is preferably provided with irregularities, whereby contact between the water-stopping materials after insertion of the projecting portion into the recess. The area can be increased to increase the water stoppage.

  FIG. 2 shows a state in which the water stop devices of FIGS. 1A and 1B are joined together to form an expansion joint structure. In FIG. 1, there is a gap 24 between the pair of concrete secondary products 7A and 7B. Here, the products 7A and 7B are brought close to each other, and the gap 26 is reduced. This method is, for example, binding by tension as shown in FIG. At this time, by inserting the protruding portion 1a into the recess 25, the low hardness water-stopping material 5 having the recess is pressed in the direction of the concrete surface, and at the same time, a repulsive force is generated on the protruding portion 1a. Retain sex.

  The outer peripheral surface of the concrete inner portion 1b of the second water-stopping material 1 is covered with a separate water-stopping material 2, thereby maintaining a high level of water-stopping performance. Moreover, since each water-stop material and concrete are laminated | stacked or integrally molded, the watertightness is maintained.

  Here, the movement of each water stop device when displacement is applied between adjacent concrete secondary products will be described. FIG. 3A shows a state in which an extension displacement is applied between the concrete secondary products. Although the gap 24A is widened by this displacement, the protrusion 1 is pulled out from the recess 25 by the displacement. However, the water tightness can be maintained in the remaining portion L1.

  On the other hand, when a shear displacement is applied as shown in FIG. 3B, the protruding portion is pulled out from the recess by the displacement due to the shear displacement, and a bent portion 1c is formed. As a result, watertightness can be maintained by the portion L2 remaining in the concave portion of the protruding portion and the bent portion 1c.

  The shape and dimensions of each concrete secondary product are not particularly limited. In one embodiment, as shown to Fig.4 (a), (b), each concrete secondary product is a PC box, and the water stop materials 1 and 5 are formed so that each PC box may each go around.

The material of the second waterstop material with protrusions may be a corrosion-resistant metal such as stainless steel, but an elastic elastomer such as a rubber material is suitable so that it can easily follow when the secondary concrete product is displaced. ing. In consideration of ease of insertion, a type A durometer specified in JIS K 6253 and having a hardness of 80 or more is desirable. Examples of such materials include the following.
As an example, there are hard vulcanized rubber obtained by increasing the amount of a reinforcing material, a vulcanizing agent and the like in a synthetic rubber material, and soft vinyl chloride obtained by adding a plasticizer as a softening agent to vinyl chloride.

The material of the first waterstop material with a recess is preferably a low-hardness elastic material so that it can be easily deformed and compressed when the protruding portion is inserted. More specifically, the hardness is determined by the type A durometer specified in JIS K 6253. 30 or less is desirable. Examples of such materials include the following.
As an example, there is a crosslinked viscoelastic body obtained by reacting a reactive polymer that is liquid at room temperature with a curing agent. Examples of the reactive polymer that is liquid at room temperature include liquid polybutadiene, liquid chloroprene, liquid styrene-butadiene copolymer, polyether polyol, polyester polyol, aniline derivative polyol, silicone, polysulfide, and modified silicone. As the curing agent, an isocyanate curing agent is public. In addition, there are soft rubber materials in which a large amount of softeners such as vegetable oil softeners, mineral oil softeners, and synthetic plasticizers are blended in synthetic rubber materials.

  In a preferred embodiment, a water stop material is interposed between at least one of the first water stop material and the second water stop material and the concrete. In particular, it is preferable to interpose the water-stopping material between the outer peripheral surface of the base portion embedded in the concrete secondary product and the concrete among the second water-stopping material. The material of such a water stop material is preferably a water expansion water stop material or a non-vulcanized butyl rubber water stop material.

  In a preferred embodiment, protrusions are formed on the outer peripheral surface of the first water-stopping material in the first concrete secondary product (see FIG. 1). This makes it difficult for the water-stopping material to be pulled out from the concrete, further improving the water-stopping performance.

  The method for fixing the water stop material to the concrete secondary product is not particularly limited. It is possible to fix the water stop material by inserting it into the insertion hole of the concrete secondary product on site, but this fixing takes time. Therefore, by installing a water-stopping material in the mold in advance, placing the concrete in the mold and hardening it, and then removing the mold, the water-stopping material is buried and fixed in the concrete secondary product. The next product can be strained. This eliminates the need for separate installation work at the installation site of the concrete secondary product and saves work. At the same time, since the water stop material is physically embedded in the concrete secondary product, there is no problem of dropping off during the construction of the concrete secondary product.

  For example, as shown in FIG. 5A, the first water-stopping material 5 is placed on the protrusion 32a of the mold 32, and the ready-mixed concrete 30 is placed so as to cover the first water-stopping material 5 in this state. To do. And the 1st concrete secondary product 7A is shape | molded by solidifying the ready-mixed concrete 30. FIG. And the formwork 32 is removed.

  Moreover, as shown in FIG.5 (b), the fixing hole 32b is provided in the mold frame 32, and the protrusion part 1a of the 2nd water stop material 1 is inserted and fixed in the fixing hole 32b. In this state, the ready-mixed concrete 31 is placed on the formwork 32. Then, the second concrete secondary product 7B is formed by solidifying the ready-mixed concrete. Then, the mold 22 is removed.

  Each water stop device as described with reference to FIGS. 1 to 5 was manufactured, constructed on site, and tested for water stop performance. Specifically, an unvulcanized rubber material having a predetermined composition was placed in a mold having a molding space having a shape as shown in FIG. 1B, and molded with a press vulcanizer. The press vulcanization was performed by continuous vulcanization and was formed in a long shape. After molding, it was cut to a specified length and cut so as to have an endless ring shape. An unvulcanized rubber material similar to that of the water-stopping material main body is sandwiched between both end faces (two open end faces) of the ring-shaped molded body, and the portion is subjected to press vulcanization again. A waterstop material was prepared. The non-vulcanized butyl rubber water-stopping material 2 was laminated on the portion of the water-stopping material embedded in the concrete.

  Further, an unvulcanized rubber material was charged into a mold processed into the shape of the concave shaped member 5 as shown in FIG. 1A and molded with a press vulcanizer. The press vulcanization was performed by continuous vulcanization and was formed into a long shape. After molding, it was cut to a specified length and cut to be an endless ring. An unvulcanized rubber material similar to the water-stopping material was sandwiched between the end faces of the ring-shaped molded body, and the portion was press-vulcanized again to produce an endless ring-shaped water-stopping material.

  The above-described waterless materials 1 and 5 subjected to endless processing were respectively placed on a concrete casting form 22 to cast concrete. After curing the concrete for 2 weeks, the mold was removed and a water-stopping material was embedded in the PC box. That is, a test body “b” in which a test body “a” and a water-stopping material 5 having a recess as shown schematically in FIG.

  Next, as shown in FIG. 7, two holes were made in the central portion of the test body a, and a water pressure gauge 9, a water supply port 10, and a water drain valve 11 were attached thereto. Next, as shown in FIG. 8, the test piece a and the test piece a are inserted so that the protruding portion of the water stop material 1 embedded in the test piece a is inserted into the recess of the water stop material 5 embedded in the test piece b. The test body b was joined. This was sandwiched with an H-shaped steel material 12 and connected with bolts 13. Next, the presence or absence of water leakage when water was introduced from the water supply port 10 and water pressure and displacement were applied was confirmed. The results are shown in Table 1. In addition, the hardness of the water stop material 1 with a protrusion part is 80 in JIS A6253 A type, and the hardness of the water stop material 5 with a recessed part is 5 in JIS A6253 A type.

  As shown in Table 1, it satisfactorily followed an extensional displacement of 10 mm or less, and no water leakage was observed even after 28 days. In addition, due to the repulsive force caused by deformation and compression that occurs when the protrusion is inserted into the recess, water leakage did not occur even after 28 days.

  Further, it satisfactorily followed a shear displacement of 10 mm or less, and no water leakage was observed even after 28 days. In addition, due to the repulsive force caused by deformation and compression that occurs when the protrusion is inserted into the recess, water leakage did not occur even after 28 days.

(A) is sectional drawing which shows the state by which the water stop material 5 which has a recessed part is embedded in PC box 7A, (b) is the water stop material 1 which has the protrusion part 1a in PC box 7B. It is sectional drawing which shows the state embedded. It is sectional drawing which shows the water stop joint structure produced by fitting the water stop material of Fig.1 (a) and (b). (A) is sectional drawing which shows a state when expansion-contraction displacement is added to the joint structure of FIG. 2, (b) is sectional drawing which shows a state when shear displacement is added to the joint structure of FIG. is there. (A), (b) is a top view which shows typically the state which installed the endless type ring-shaped water stop material 5, 1 in PC box 7A, 7B, respectively. (A), (b) is sectional drawing which shows the state which installed each water-stopping material 5 and 1 on the formwork 32, respectively, respectively, and cast concrete. It is a perspective view which shows the test bodies a and b. It is a perspective view which shows the state which attached the test equipment to the test body a. It is the figure which installed the test body a and the test body b in the test device. It is a perspective view of an example of the water stop material used for the joint of the conventional PC box. It is a top view of an example of construction of the conventional PC box. It is sectional drawing of an example of the elastic flexible joint apparatus used for the conventional PC box. It is sectional drawing of an example when the elastic flexible joint apparatus used for the conventional PC box is displaced.

Explanation of symbols

1: Second water-stopping material 1a: Protruding portion 2: Non-vulcanized butyl rubber material or water-expandable water-stopping material 3: Anchor portion 5: First water-stopping material 6: Projection 7A, 7B: PC box ( Concrete secondary products)
8: Concrete test case 9: Water pressure gauge 10: Water supply port 11: Drain valve 12: H-type steel material 13: Bolt 14: Core material 15: Non-vulcanized butyl rubber material 16: Water stop that expands when it comes into contact with water Material 17: Tension bar 18: Joint of PC box 19: Elastic type flexible joint device (external type)
20: Conventional type flexible flexible joint device (embedded type)
21: PC box joint part where conventional type flexible joint device is installed 22, 23: Water stop structure 25: Recess 32: Formwork a: Pressure in the concrete surface direction b: Repulsive force h: Step w: Groove Width w1: Clearance between recesses L1: Remaining portion inserted into the recess when the convex portion of the convex member is pulled out by extension displacement L2: State where the convex portion of the convex member is pulled out due to shear displacement The remaining part inserted into the recess when

Claims (11)

A joint structure for stopping the gap between the first concrete secondary product and the second concrete secondary product,
A first water-stopping material at least partially embedded in the first concrete secondary product, and a second water-stopping material at least partially embedded in the second concrete secondary product A recess is formed in the first water-stopping material in the first concrete secondary product, a protrusion is formed in the second water-stopping material, and the protrusion is A waterproof joint structure, which is fitted into the recess.   The waterproof joint structure according to claim 1, wherein the second waterproof material is made of a polymer material having a hardness of 80 or more according to a type A durometer specified in JIS K 6253.   The waterstop joint structure according to claim 1 or 2, wherein the first waterstop material is made of a polymer material having a hardness of 30 or less according to a type A durometer specified in JIS K 6253.   The water-swellable water-stopping material or the non-vulcanized butyl rubber water-stopping material is interposed between at least one of the first water-stopping material and the second water-stopping material and the concrete. The waterproof joint structure according to any one of claims 1 to 3.   The water stop according to any one of claims 1 to 4, wherein protrusions are formed on an outer peripheral surface of the first water stop material in the first concrete secondary product. Joint structure. A water stop structure used for a joint structure for water stopping a gap between concrete secondary products,
A water stop structure comprising a water stop material at least partially embedded in the concrete secondary product, wherein the water stop material has a recess formed in the concrete secondary product. .   The water stop structure according to claim 6, wherein a water expansion water stop material or a non-vulcanized butyl rubber water stop material is interposed between the water stop material and the concrete secondary product.   The water stop structure according to claim 6 or 7, wherein protrusions are formed on an outer peripheral surface of the water stop material in the concrete secondary product. A water stop structure used for a joint structure for water stopping a gap between concrete secondary products,
The water stop material is provided with a water stop material at least partially embedded in the concrete secondary product, and the water stop material is provided with a protruding portion from the concrete secondary product. Construction.   The water stop structure according to claim 9, wherein a water expansion water stop material or a non-vulcanized butyl rubber water stop material is interposed between the water stop material and the concrete secondary product. A method for producing a water stop structure used for a joint structure for water stopping a gap between concrete secondary products,
Concrete is placed so that the water-stopping material is immersed in the mold with the water-stopping material fixed to the mold, and the concrete secondary product is formed by solidifying the concrete, and the concrete A method for producing a water-stopping structure, characterized in that a next product and the water-stopping material are integrated, and then the mold is removed from the concrete secondary product.

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