JP2006009341A - Joint seal material of caisson - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint seal material of a caisson capable of maintaining a water shielded state by coping with also the abrupt opening of a joint by earthquake and having excellent installation workability. <P>SOLUTION: This joint seal material 10 comprises a fixing part 12 and a connection water-cutoff plate part 13 in a cylindrical body opening at its upper end part and closed at its lower end part by a bottom wall 11A formed of a rubber sheet. The connection water cutoff plate part 13 comprises a plate-like fixed plate part 13A and an extendable part 13B folded with a prescribed width to one side along the outer surface of the cylindrical body 11, and fixed to the outer surface of the cylindrical body 11 at a position symmetrical with the fixing part 12 on one side of the center of the cylindrical body through the extendable part 13B. The joint seal material 10 is fixedly tightened to the end face 1A of the caisson 1 watertight with the fixing part 12, and the fixed plate part 13A of the connection water cutoff plate part 13 is fixedly connected to the inside of a fixed groove 1B' formed at the end face 1A' of the caisson 1' with concrete mortar. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a joint sealing material that seals a gap between adjacent caissons to prevent water circulation and sediment discharge when a revetment wall is constructed by caisson for reclamation of the sea, a lake, or the like.

  There is a construction method in which when reclaiming the sea, a revetment wall is constructed by continuously sinking a plurality of caissons in series surrounding the sea surface to be reclaimed, and earth and sand are brought into the sea area surrounded by the revetment wall.

  When building a revetment wall in a landfill site with caisson as in this construction method, it is necessary to completely seal the joint between caisson with a sealant etc. to prevent outflow of earth and sand etc. through the gap between adjacent caisson. is there.

  As disclosed in Patent Document 1, the sealing material used in that case is formed in a hollow long cylindrical shape having an upper end opened and a lower end closed by a flexible material, and is formed on one end face of an adjacent caisson. Some of them are mounted and filled with a filling material such as sand, asphalt, concrete mortar, etc., so that the outer surface is swelled and the outer surface is crimped to the opposite end face of the other caisson.

In addition, as a seal portion structure using such a seal material, a seal material is disposed in each joint near the inner and outer surfaces of the caisson, and a filling material such as asphalt mastic is filled in the joint between the seal materials. There is something. (See Patent Documents 2 and 3)
Japanese Patent Publication No. 5-7486 Japanese Patent No. 2622892 JP 2002-167772 A

  By the way, when building a revetment in a landfill site for waste by caisson as described above, it must be a managed revetment that can completely prevent the outflow of harmful components of waste.

  However, in the conventional sealing material and the sealing portion structure, when the adjacent caisson is relatively displaced due to an earthquake or the like and the joint is suddenly opened, a gap is generated without being able to cope with it, and the water shielding There was a problem that there was a risk of insufficient.

  Therefore, it is conceivable to form a water stop plate portion integrally with the seal material (or to insert a water stop plate in the seal material mounting portion) and fasten the outer edge of the water stop plate to the opposing caisson. In this case, the work of fastening the water stop plate portion (water stop plate) to the caisson must be performed underwater by the diver, which is extremely troublesome.

  The present invention has been made in view of the above problems, and can provide a caisson joint sealing material that can maintain a water-blocking state in response to a sudden opening of a joint due to an earthquake or the like and has good workability. The purpose is to provide.

The caisson joint sealing material of the present invention that achieves the above object is disposed between the end faces of adjacent caisons, and is swelled by filling the inside with a filling material to seal between the end faces. A hollow long cylindrical tubular body made of a flexible material is closed and fixed in a watertight manner to a caulking portion fastened to an end surface of one caisson and an outer surface of the other caisson. Connecting water stop plate portions are respectively provided along the longitudinal direction,
The attachment portion is formed so as to project into a plate shape having a predetermined width on both left and right sides of the cylindrical main body, and is fastened to an end surface of one caisson on both the left and right sides of the cylindrical main body. The plate portion has a large-diameter engaging portion at the tip, and is connected to the fixing groove of the other caisson by a concrete mortar and connected and fixed, and the base end of the connecting plate portion is connected to the cylindrical shape. It comprises a telescopic part that is folded along the outer surface of the main body and is connected to the cylindrical main body, and is provided with the coupling portion protruding at a position symmetrical to the affixed portion of the cylindrical main body. To do.

  The joint sealing material configured in this way is attached to the end face of one of the caissons that has been previously installed at the end thereof before installation. In the other adjacent caisson installed after the caisson is installed, a filler such as concrete mortar is placed by positioning the joint of the water stop plate in a fixed groove formed in advance in the other caisson. This is connected and fixed in a watertight manner.

  According to the caisson joint sealing material of the present invention, the tubular main body which is fixed to one caisson at the attachment portion and is filled with the filling material inside and swells seals the joint. Corresponding to the opening, the expansion / contraction part of the connecting water blocking plate part extends to maintain the sealing state and maintain the water shielding state. In addition, the connection water stop plate portion is connected and fixed in a watertight manner by placing a filler such as concrete mortar by placing the connection plate portion in a fixed groove formed in the opposite surface of the other adjacent caisson. Therefore, there is no need for troublesome underwater work for fixing the connection water stop plate portion to the caisson, and the mounting workability is extremely good. Furthermore, since the connecting plate portion is continuously embedded in the filler in the longitudinal direction, the connecting plate portion is surely fixed and has high water tightness.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a perspective view of a structural example of a caisson joint sealing material according to the present invention, FIG. 2 (A) is a plan view thereof, and FIG. 2 (B) is a plan view of a mounting process.
The joint sealing material 10 has a length corresponding to the height of the caisson to be mounted, and includes a tubular body 11 and a staking portion 12 and a connected water stop plate portion 13. The cylindrical main body 11 and the staking part 12 are each provided with a reinforcing fiber having a predetermined thickness in which a synthetic fiber is interposed in a central portion of a synthetic rubber plate having aging resistance, seawater resistance, weather resistance, and heat resistance. It is formed by a rubber plate.

  The cylindrical main body 11 is a cylindrical body having an elliptical cross-sectional shape, and an upper end is opened and a lower end is closed by a bottom wall 11A made of a rubber sheet.

  The bottom wall 11A is formed so as to protrude downward in a spindle shape as shown by an imaginary line in FIG. 1, and is attached to the caisson in a state of being folded inside the cylindrical main body 11 as shown by a broken line. As will be described later, when the filling material 4 is filled in the cylindrical main body 11, the bottom wall 11A is brought into close contact with the unevenness of the ground.

  The brace portion 12 protrudes with a predetermined width on both the left and right sides of the cylindrical main body 11 over the entire longitudinal direction of the cylindrical main body 11, and this is because a rubber plate wider than the long diameter of the cylindrical main body 11 is It is formed by being fixed to the main body 11 with a predetermined width by integral vulcanization.

  The connection water stop plate portion 13 is composed of a plate-like fixed plate portion 13A as a connecting plate portion and an expansion / contraction portion 13B at the base end thereof, and is similar to the elastic material such as a synthetic rubber similar to the cylindrical main body 11 and the attachment portion 12. It is made of material.

  The fixed plate portion 13A has a plate shape with a predetermined thickness and a predetermined width, and is provided with an engagement portion 13C having a circular cross section with a diameter larger than the plate thickness at the tip edge.

  The stretchable part 13B is continuous with the fixed plate part 13A at a predetermined thickness and is folded at a predetermined width on one side along the outer surface of the cylindrical main body 11 (this configuration example is folded in two). The tip edge is formed in advance and is fixed to the outer surface of the cylindrical body 11 by integral vulcanization.

  And this connection water stop board part 13 is continuously integrated via the expansion-contraction part 13B on the outer surface of a symmetrical position with the attachment part 12 on both sides of the center of the cylindrical main body 11, and fixed board part 13A is a cylindrical main body. 11 is provided along the longitudinal direction of the cylindrical main body 11 in a substantially upright state from the outer surface of the cylindrical body 11.

  As shown in FIG. 2 (B) and FIG. 3 which is a plan view of the mounted state, the joint sealing material 10 configured as described above is formed on the edge line 1A near the outer surface of the caisson 1 installed earlier, on its ridgeline. The fixing plate portion 13A of the connection water stop plate portion 13 is fixed in a watertight manner to the end surface 1A 'of the caisson 1' to be installed later. Attached to the joint 2.

  That is, in the caisson 1, the anchor bolt 21 planted on the end face 1A is passed through the anchoring portion 12, and the anchoring portion 12 is connected to the caisson 1 via the holding plate 23 by the nut 22 screwed to the anchor bolt 21. It is fixed by being fastened to the end face 1A. This mounting operation can be performed before the caisson 1 is set.

  As shown in FIGS. 2B and 3, the caisson 1 ′ is formed with a fixing groove 1B ′ at a portion where the joint sealing material 10 is mounted, and the joint sealing material is formed inside the fixing groove 1B ′. The fixed plate portion 13A of the ten connected water blocking plate portions 13 is positioned and fixed so as not to be detached by the concrete mortar 3 (shown in FIG. 3) placed in the fixing groove 1B ′.

  The fixing groove 1B 'has a dovetail cross section whose opening is narrower than the bottom surface. When the caisson 1' is installed in a predetermined positional relationship with the caisson 1, the joint sealing material 10 attached to the caisson 1 is installed therein. It is formed in the attachment site | part of the joint sealing material 10 so that the fixed board part 13A of the connection water stop board part 13 may be accommodated.

  When the concrete mortar 3 is filled in such a state that the fixed plate portion 13A is positioned in the fixed groove 1B ′, the concrete mortar 3 is solidified and integrated with the caisson 1 ′ so as not to fall off due to the shape of the fixed groove 1B ′. The fixed plate portion 13A is buried in the concrete mortar 3 and is fixed so as not to fall off by the engaging portion 13C at the leading edge. That is, the connection water stop plate portion 13 is connected and fixed to the caisson 1 ′ so as not to fall off. In the figure, reference numeral 30 denotes a support frame that prevents the cylindrical main body 11 from being inserted into the fixing groove 1B ′ during construction to be described later.

  The cylindrical main body 11 of the joint sealing material 10 disposed between the caisson 1 and the caisson 1 ′ is filled with the filling material 4, and the action of the pressure causes the cylindrical main body 11 to bulge into a circular cross section. The outer surface is crimped to the end surfaces 1A and 1A 'of the caissons 1 and 1' to seal the joint 2 in a watertight manner.

  Such a joint sealing material 10 is fixed in the vicinity of both the inner and outer surfaces of the joint portion 2 between the caisson 1 and the caisson 1 ′, and the asphalt between the two joint sealing materials 10 (one is not shown). The impermeable layer is formed by filling the filling material 5 such as mastic.

  The joint sealing material 10 is installed on the caisson 1 in advance before construction, after the caisson 1 is set in a predetermined position, the adjacent caisson 1 ′ is attached to the caisson 1. The cylindrical main body 11 is filled with the filling material 4 and the concrete mortar 3 is filled into the fixing groove 1B ′ of the caisson 1 ′ from the upper opening thereof. Can be done. In other words, the joint sealing material 10 can be easily attached to the caisson 1 on land, and the caisson 1 'is sunk in a predetermined positional relationship with respect to the installed caisson 1 so that the cylindrical main body 11 becomes caisson 1. And the fixing plate portion 13A of the connection water stop plate portion 13 are positioned in the fixing groove 1B 'of the caisson 1', and then the cylindrical main body 11 is closed. By connecting the filling material 4 into the interior and filling the concrete mortar 3 into the fixing groove 1B ′ of the caisson 1 ′, the connection water stop plate portion 13 can be easily connected and fixed to the caisson 1 ′. That is, in order to connect and fix the connection water stop plate portion 13 to the caisson 1 ', there is no need for underwater work by a diver, and it can be easily performed in a short time with extremely good workability.

  Here, by providing the support frame 30 as described above at the opening of the fixing groove 1B ′ of the caisson 1 ′, the tubular body 11 is bulged into the fixing groove 1B ′ when the filling material 4 is filled. Can be prevented.

  As shown in the perspective view of FIG. 4, the support frame 30 is formed by connecting left and right blocking plates 31 that block the opening of the fixing groove 1 </ b> B ′ with a connecting portion 32 having a shape straddling the connecting water blocking plate portion 13. ing. The connecting portion 32 is intermittently provided in the longitudinal direction of the fixed groove 1B ′, and the portion between the left and right closing plates 31 is opened at portions other than the portion where the connecting portion 32 is provided, and the concrete is supplied to the fixed groove 1 ′. The filling of the mortar 3 is not hindered. Then, the fixed groove 1B ′ of the caisson 1 ′ is provided so as to cover the opening thereof, and the concrete water mortar 3 is fixedly driven into the fixed groove 1B ′ by placing a concrete mortar 3 for fixing the connection water stop plate 13 to the fixed groove 1B ′. It is. The support frame 30 does not need to be fixed to the caisson 1 'in advance, and is inserted by sliding between the joint sealant 10 and the caisson 1' before filling the cylindrical body 11 with the filling material 4. It is good.

  In the joint sealing material 10 configured as described above, the caisson 1, 1 ′ (joint part 2) is coupled (joint part 2 is closed) by the connecting water stop plate part 13, so that an earthquake, etc. Even if the caissons 1 and 1 ′ are suddenly relatively displaced, the water blocking state can be maintained by the connecting water stop plate portion 13.

  That is, when the caissons 1 and 1 'are separated (displacement where the joint portion 2 is opened), as shown in FIG. . At this time, the connection water stop plate portion 13 also acts to pull the cylindrical main body 11 to follow the opening of the joint portion 2. This is the same even when the caissons 1 and 1 ′ are relatively displaced in the direction orthogonal to the extending direction, and the water shielding state can be maintained.

  Thus, while maintaining the water-blocking state by the connection water stop plate part 13, the tubular body 11 can be expanded to restore the original water-blocking state by the tubular body 11. is there. The connection water stop plate portion 13 is in a symmetrical position with the attachment portion 12, and the expansion amount of the expansion / contraction portion 13B with respect to the separation displacement of the caissons 1 and 1 'may be the shortest, and therefore, the increase volume of the filling material 5 may be small. .

  The present invention is not limited to the above-described configuration example, and can be changed as appropriate. For example, the expansion / contraction part 13B of the connection water stop plate part 13 may be configured to be folded twice or more, or may be configured to be folded not only on one side but also on the left and right sides.

It is an example of 1 structure of the caisson joint sealing material which concerns on this invention. (A) is a plan view of the joint sealing material, and (B) is a plan view of the mounting process. It is a top view of the mounting state of a joint sealing material. It is a perspective view of a support frame. It is operation | movement explanatory drawing of a joint sealing material.

Explanation of symbols

1 Caisson (one caisson)
1 'caisson (the other caisson)
1B 'Fixing groove 2 Joint part 3 Concrete mortar 4 Filling material 1A, 1A' End face 10 Joint sealant 11 Cylindrical body 12 Adhering part 13 Connection water stop plate part 13A Fixing plate part (joint plate part)
13B telescopic part

Claims (1)

It is disposed between the end faces of adjacent caissons, and swells by being filled with a filling material inside to seal between the end faces,
A hollow long cylindrical tubular body made of a flexible material with a closed bottom end is connected and fixed in a watertight manner to a staking portion fastened to an end surface of one caisson and an outer surface of the other caisson. The connection water stop plate part is provided along the longitudinal direction,
The attachment portion is formed so as to project into a plate shape having a predetermined width on both the left and right sides of the cylindrical main body, and is fastened to the end surface of one caisson on the left and right sides of the cylindrical main body,
The connection water stop plate portion has a large-diameter engagement portion at a distal end, and is connected to a fixing groove of the other caisson by a concrete mortar and connected and fixed, and a base end of the connection plate portion is continuous. And an expansion / contraction portion that is folded along the outer surface of the cylindrical main body and is connected to the cylindrical main body, and is provided with the coupling portion protruding at a position symmetrical to the attachment portion of the cylindrical main body. Caisson joint sealing material characterized by that.

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