JP2005290758A - Elastic joint structure and elastic joining method for caisson concrete blocks - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an elastic joint structure for caisson concrete blocks for use as culverts of a sluice or the like, which dispenses with conventionally required grout injection work into seal holes, allows execution of water cutoff work of the seal holes in a short period of time by using simple and inexpensive members, contributes to drastic reduction of material costs and construction costs, and exerts reliable water cutoff performance even against shear deformation or bending deflection occurring on the culvert, over a long period of time, and to provide an elastic joining method for the caisson concrete blocks. <P>SOLUTION: According to the elastic joint structure, a ring packing 10 is arranged between end openings 3a, 3a of respective sheath holes 3, 3 at a joint portion of a pair of the culvert concrete blocks 1, 1 joined to each other, and one of fitting portions 11a of a cylindrical portion 11 thereof is fitted into one of the end openings 3a, followed by compressively deforming a flange portion 12 thereof by joined end faces of the respective culverts by straining joining by using a tendon 2. Then an inner surface of an insertion hole 13 of the packing is brought into intimate contact with a surface of the tendon 2 by compressing and swelling, to thereby prevent water from infiltrating into the sheath hole 3. Thus the ring packing 10 can be deformed to follow shear deformation and bending deflection of the culvert. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an elastic joint structure of a box concrete block in a pipe fence such as a lock used in a river bank, a waterway, a common ditch or the like provided in a river bank.

  For example, in Xiamen, a box concrete block that constitutes a pipe fence may be integrated by introducing tensile force in the pipe axis direction with a tension material to form a prestressed concrete structure. The system is used (for example, refer nonpatent literature 1).

For example, a rubber joint in which flat rubber or the like is sandwiched between the joining surfaces is used for water stoppage of such a joint, but for a sheath hole of a tension material, a tension material such as a strand of PC steel is used for the sheath hole. After passing, a grout material for preventing water intrusion is injected into the sheath hole. In the case of the rigid joining method, a high fluidity mortar is injected, and in the case of the elastic joining method, a low-viscosity urethane elastic sealing material is injected.
National Institute for Land and Infrastructure Studies “Guide to Flexible Structure Xiamen Design”, Sankai-do Co., Ltd., issued on November 30, 1998, p164-173

  In the case of the elastic bonding as described above, a large amount of a relatively expensive low-viscosity urethane elastic sealing material is required, and the injection work takes time and there are problems such as high material cost and construction cost.

  The present invention was made to solve the above-mentioned problems, and in the elastic joining of a box concrete block used for a pipe fence such as a lock gate, the conventional operation of injecting a grout material into a seal hole is unnecessary. Sealing holes can be sealed in a short time with a simple and inexpensive material, material costs and construction costs can be greatly reduced, and long-term protection against shear deformation and bending deformation of pipe rods is ensured. It is an object of the present invention to provide an elastic joint structure and an elastic joint method for a box concrete block that can achieve a good water stoppage.

  According to the first aspect of the present invention, an elastic body (rubber or the like) is interposed in a joint portion of a box concrete block, and a tension material (PC) inserted through a sheath hole along the box axis direction formed in the box concrete block. It is an elastic joint structure of box concrete blocks used for elastic bonding of box concrete blocks by introducing tension in the box axis direction using steel bars, PC steel wires, PC steel strands, etc. A ring packing material made of an elastic body (CR or other rubber) is provided between each end opening of the sheath hole in the joint portion of the box concrete block, and both ends of the ring packing material are respectively ends of the sheath holes. A cylindrical part fitted in the opening of the part, an insertion hole for a tension material drilled in the central part of the cylindrical part along the box axis direction, and a box concrete in the central part of the cylindrical part An elastic structure for joining a box body concrete block characterized by having a flange portion which protrudes so as to be sandwiched by the joining end face of the lock.

  The present invention is applied to lock gates and other pipe rods, and a ring packing material is disposed at a position of a sheath hole between a pair of box concrete blocks, and a flange positioned between box joint end faces by tensile bonding. The part is compressed and deformed, water is sealed between the box joint end surfaces around the sheath hole, and the cylindrical part compresses and bulges toward the surface of the tension member due to the compressive deformation of the flange, thereby tensioning the inner surface of the insertion hole. It is pressed against the surface of the material to bring it into close contact, and the surface of the tendon is stopped. This reliably prevents water from entering the sheath hole. The ring packing material may be attached to the end face opening of the sheath hole of one box. Further, the shape of the ring packing material can be easily deformed and followed with respect to the shear deformation or bending deformation of the pipe rod, and a certain water-stopping property can be obtained over a long period of time. Furthermore, since it can respond to the misalignment of each box, the tendon can be held at the center of the sheath hole, and damage to the tendon can be prevented.

  In addition to the ring packing material of the sheath hole, such a joint portion is provided with a rubber joint on the outside to constitute an elastic joint structure. This rubber joint is arranged over the entire circumference of the box, for example, a water stop portion of the rubber body, a pressure plate portion, and a hanger portion that connects and integrates the water stop portion and the pressure plate portion. A T-type rubber joint composed of A water stop part is arrange | positioned between box joint end surfaces, and compresses and deforms the ring-shaped protrusion which protrudes toward the joint end surface of one box, and performs water stop. The pressure-resistant plate portion is a portion that covers the outer peripheral surface of the joint portion at the time of joining and prevents intrusion of earth and sand, and the fixing portion at one end is fixed to the box on the fixed side.

  According to a second aspect of the present invention, in the elastic joint structure for a box concrete block according to the first aspect, the ring packing material is divided by a dividing plane along the box axis direction. It is an elastic joint structure of a block.

  That is, the ring packing material is divided vertically into two or three parts so that the ring packing material can be assembled to the tension material, and there is a large-diameter screw at the end of the tension material. This is applied when a tendon cannot be inserted into the insertion hole. After arranging the tendon, one end of the cylindrical portion is fitted into the end opening of the sheath hole while assembling the divided ring packing material to the tendon.

  According to the third aspect of the present invention, an elastic body (rubber or the like) is interposed in the joint portion of the box concrete block, and the tension material (PC) inserted through the sheath hole formed in the box concrete block along the axis direction of the box. It is an elastic joining method of box concrete blocks used when box concrete blocks are elastically joined by introducing tensile force in the box axis direction using steel bars, PC steel wires, PC steel strands, etc. One end of the cylindrical portion of the ring packing material according to claim 1 is fitted and attached to the end opening of the sheath hole of one box concrete block to be joined before joining. The ring packing is inserted into the end opening of the sheath hole of the other box concrete block by tensioning the tension material inserted through the insertion hole of the sheath hole and the ring packing material. The other end of the cylindrical part of the packing material is inserted, the flange part of the ring packing material is sandwiched between the joint end faces of the box concrete block and compressed, and the inner surface of the insertion hole is brought into close contact with the surface of the tension material by compression bulging This is an elastic joining method for a box concrete block. That is, this is a case where an integral ring packing material is used and the ring packing material is mounted before the tension material is disposed.

  According to the invention of claim 4 of the present invention, an elastic body (rubber or the like) is interposed in the joint portion of the box concrete block, and the tension material (PC) inserted through the sheath hole formed in the box concrete block along the axis direction of the box. It is an elastic joining method of box concrete blocks used when box concrete blocks are elastically joined by introducing tensile force in the box axis direction using steel bars, PC steel wires, PC steel strands, etc. After inserting the tension material into the sheath hole of the box concrete block, the multiple ring packing material according to claim 2 is assembled to the tension material located in the joint portion space, and one end of the cylindrical portion is joined. The end of the sheath hole of the other box concrete block is fitted and installed in the end opening of the sheath hole of one box concrete block and the tension material is tensioned. The other end of the cylindrical portion of the ring packing material is inserted into the opening, the flange portion of the ring packing material is compressed by sandwiching the joint end surface of the box concrete block, and the inner surface of the insertion hole is compressed and bulged. It is an elastic joining method for a box concrete block characterized by being closely attached to the surface. That is, this is a case where a split-type ring packing material is used and the ring packing material is mounted after the tension material is disposed.

  In addition, there are a case where a plurality of cases are partially tensed and a case where all cases are tensed at once.

  According to the present invention configured as described above, the following effects can be obtained.

  (1) A ring packing material made of rubber and having a simple structure is used and is attached to one box. This eliminates the need for conventional grout material injection into the seal hole, making it simple and inexpensive. The seal hole can be water-stopped in a short time by the member, and the material cost and construction cost can be greatly reduced.

  (2) Since no adhesive is used, the ring packing material can be attached even at low temperatures, and it is possible to construct pipes with an elastic joint structure even in cold regions.

  (3) The ring packing material has a shape that can easily deform and follow the shear deformation, bending deformation, etc. of the pipe rod, and can provide a certain water-stopping property for a long period of time.

  (4) The ring packing material has a shape that can cope with the misalignment of each box, can hold the tension material at the center of the sheath hole, and can prevent the tension material from being damaged.

  Hereinafter, the present invention will be described based on an embodiment shown in the drawings. This is an example in which the present invention is applied to a box concrete block of Xiamen. FIG. 1 shows a joint part of a box concrete block according to the present invention, in which (a) is an overall front view, (b) is a partial front view, and (c) is a vertical sectional view of an elastic joint part. FIG. 2 is a cross-sectional view showing ring packing materials having different shear deformation amounts used in the present invention. FIG. 3 is a front view showing a split ring packing material. FIG. 4 is a cross-sectional view showing various examples of different ring packing materials.

  In FIG. 1, a box concrete block 1 is a rectangular tube with a predetermined thickness and a sheath hole 3 of a tendon 2 is drilled in parallel to the axis of the box at the four corners and the center of the side wall. The ring packing material 10 of the present invention is disposed between the end openings 3a and 3a of the sheath holes 3 and 3 in the joint portion of the pair of box concrete blocks 1 and 1 to be joined. A rubber joint 20 that surrounds the entire outer periphery is mounted on the outer periphery of the joint. The sheath hole 3 is formed by a steel pipe 4 embedded in the box concrete block 1.

  The ring packing material 10 is, for example, chloroprene rubber (CR) having a rubber hardness of about A30. The ring portion 10 has a cylindrical portion 11 having an outer diameter substantially equal to the inner diameter of the sheath hole 3 and an outer portion from the central portion of the cylindrical portion 11 in the box axis direction. A ring-shaped flange portion 12 that protrudes integrally toward the center is formed, and an insertion hole 13 through which the tension material 2 is inserted is formed in the center portion of the cylindrical portion 11.

  The left and right sides of the cylindrical portion 11 are inserted into a predetermined length by the flange portion 12 protruding at a predetermined length, and the inserted portions 11a and 11b are completely inserted into the end openings 3a of the sheath holes 3, respectively. Inserted. In addition, since the flange part 12 compresses and deforms at the time of tension joining mentioned later and becomes thin, the right insertion part 11b is formed shorter than the left insertion part 11a. Further, a haunch 12a for preventing stress concentration is formed at the base of the flange portion 12, and the end surface of the end opening 3a is chamfered correspondingly.

  A plurality of protrusions 14 that are semicircular in cross section and continuous in the circumferential direction are integrally projected on both side surfaces of the flange portion 12 and the inner surface of the insertion hole 13. The protrusions 14 are provided to improve the adhesion by being deformed by the pressing force. In the insertion hole 13, the tip inner diameter of the protrusion 14 is made substantially the same as the outer diameter of the tendon 2.

  The flange portion 12 is sandwiched between the joint end faces of the pair of box concrete blocks 1 and 1 and is compressively deformed (about 35 to 50%) to stop water between the box joint end faces around the sheath hole. Along with the compression deformation of the flange portion, the cylindrical portion 11 is compressed and bulged toward the surface of the tension material 2, and the inner surface of the insertion hole 13 is pressed against and closely contacts the surface of the tension material 2. Water is made. Further, the shape of the ring packing material 10 can be deformed to follow shear deformation, bending deformation, etc. of the pipe rod, and can provide a certain water-stopping property over a long period of time. Max. 20-30 mm), the tension material 2 can be held at the center of the sheath hole 3, and damage to the tension material 2 can be prevented.

  FIG. 2 (a) shows a ring packing material 10 for shearing 20 mm (thickness 20 mm of the cylindrical portion 11). FIG. 2 (b) shows that the thickness of the cylindrical portion 11 is increased and the height of the flange portion 12 is increased. This is a ring packing material 10 for shearing 30 mm.

  As shown in FIG. 1 (c), the rubber joint 20 is a T-type rubber joint composed of a water-stop part 21, a pressure-resistant plate part 22, and a hanger part 23 of the rubber body. The water stop portion 21 is provided with two ring-shaped protrusion portions 21a protruding inward and outward directions that protrude toward the joint end face of the one side moving box concrete block 1, and a pair of protrusion portions 21a at the time of tension joining. Water is stopped by compression deformation (about 50%).

  The pressure-resistant plate portion 22 is a portion that covers the outer peripheral surface of the joint portion at the time of joining and prevents intrusion of earth and sand, and is fitted into a concave portion formed on the outer surface of the box-side concrete block 1 on the fixed side. It is fixed by doing. The hanger part 23 is a member that integrally connects the water stop part 21 and the pressure-resistant plate part 22, and as shown in FIG. 1 (b), it is cut off at the corner part of the box (the hatched part in the figure) Familiarity is improved by an appropriate pressure-resistant plate portion 22 of R, and intrusion of earth and sand is prevented.

  Such a rubber joint 20 is disposed over the entire circumference of the box. However, in order to facilitate mounting on the site, the rubber joint 20 is divided at the center in the height direction, and the divided portion is a simple joint for butt-joining. Join. Further, the rubber joint 20 can be deformed to follow the shear deformation or bending deformation of the pipe rod.

  In the elastic joint structure having the above configuration, the joining is performed in the following procedure (see FIG. 1). In addition, there are a case where a plurality of cases are partially tensed and a case where all cases are tensed at once.

  (1) Before joining, a pair of box concrete blocks 1 and 1 are installed with a predetermined joint space, and one fitting portion 11a of the cylindrical portion 11 of the ring packing material 10 is connected to one fixed side. It is fitted into the end opening 3 a of the sheath hole 3 of the box concrete block 1. At this time, adhesive fixing is not required and can be easily mounted. Moreover, since no adhesive is used, it can be mounted even at low temperatures. The rubber joint 20 is also attached to the outer surface of the box-shaped concrete block 1 on the fixed side.

  (2) Pass the tension material 2 such as a PC steel strand through the sheath hole 3 of the moving-side box concrete block 1, pass through the insertion hole 13 of the ring packing material 10, and the sheath hole 3 of the fixed-side box concrete block 1. Insert it inside. At this time, it is preferable to draw in from one direction using a small-diameter lead wire.

  (3) Tension the tendon 2 and fix both ends. The box-shaped concrete block 1 on the moving side moves, the other fitting portion 11b of the cylindrical portion 11 of the ring packing material 10 is fitted into the end opening 3a of the sheath hole 3, and the flange portion 12 of the ring packing material 10 is further inserted. Is compressed and deformed at the joint end surfaces of the pair of box concrete blocks 1 and 1, and the inner surface of the insertion hole 13 is brought into close contact with the surface of the tension material 2 by compression and swelling, and the intrusion of water into the sheath hole 3 is surely prevented. Is done.

  Next, in the case where large-diameter screws are provided at both ends of the strands of PC steel of the tension material 2, the tension material 2 cannot be inserted into the insertion holes 13 of the ring packing material 10. In this case, as shown in FIG. 3, the ring packing material 10 is vertically divided into two on a dividing surface parallel to the box axis direction. Note that the number of divisions is not limited to two and may be three or more.

  At the time of joining, before attaching the ring packing material 10, the tension material 2 is inserted through the sheath holes 3 of the pair of box concrete blocks 1 and 1 installed with a predetermined joint space, and is divided. The ring packing material 10 is assembled to the tension material 2 located in the joint space, and one insertion portion 11a of the cylindrical portion is connected to the end opening 3a of the sheath hole 3 of the one fixed side box concrete block 1 to be joined. Fit and install. Then, the tension material 2 is tensioned. The subsequent steps are the same as (3) above.

  FIG. 4 shows the shape of the ring packing material 10 that can cope with shear deformation and the like, and a notch portion with a taper is provided at the end of the cylindrical portion 11, and a relief portion such as a tension material is provided by this notch portion. By forming this, it is possible to easily follow shear deformation and the like. In FIG. 4A, a taper 15 that widens toward the outside in the box axis direction is provided on the inner side of the distal end portion of the fitting portion 11a. In FIG. 4B, a taper 15 that widens outward in the box axis direction is provided on the inner side of the tip of the fitting portion 11b, and a taper 15 that narrows outward in the axis direction is further provided on the outer side. In FIG. 4 (c), tapers 15 and 16 are provided on both sides of the cylindrical portion 11, respectively.

  In addition, although the example which applied this invention to Xiamen was shown above, it is not restricted to this, It can apply also to joining of other box concrete blocks. Further, it goes without saying that the present invention is not limited to the illustrated examples as described above.

FIG. 1 shows a joint portion of a box concrete block of the present invention, (a) is an overall front view, (b) is a partial front view, and (c) is a vertical sectional view of an elastic joint portion. It is sectional drawing which shows the ring packing material from which the shear deformation amount used by this invention differs. It is a front view which shows the split-type ring packing material used by this invention. It is sectional drawing which shows the various examples from which the shape of the ring packing material used by this invention differs.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Box concrete block 2 ... Tension material 3 ... Sheath hole 3a ... End part opening 4 ... Steel pipe 10 ... Ring packing material 11 ... Cylindrical part 11a ... Insertion part 11b ... Insertion part 12 ... Flange 12a ... Haunch 13 ... Insertion hole 14 ... Protrusion 15 ... Taper 16 ... Taper 20 ... Rubber joint 21 ... Water stop 21a ... Projection 22 ... Pressure-resistant plate 22a ... Fixing 23 ... Hanger part

Claims (4)

By introducing an elastic body in the joint part of the box concrete block and introducing the tension force in the box axis direction by the tension material inserted in the sheath hole along the box axis direction formed in the box concrete block, the box concrete It is an elastic joint structure of a box concrete block used when elastically joining blocks together.
A ring packing material made of an elastic body is provided between each end opening of the sheath hole in the joint portion of the box concrete block, and both ends of this ring packing material are fitted into the end opening of the sheath hole, respectively. A cylindrical portion, a tension material insertion hole drilled in the central portion of the cylindrical portion along the box axis direction, and a protruding portion so as to be sandwiched between the joint end surfaces of the box concrete block at the central portion of the cylindrical portion. An elastic joint structure of a box concrete block characterized by having a flange portion.   The elastic joint structure of a box concrete block according to claim 1, wherein the ring packing material is divided by a dividing surface along the box axis direction. By introducing an elastic body in the joint part of the box concrete block and introducing the tension force in the box axis direction by the tension material inserted in the sheath hole along the box axis direction formed in the box concrete block, the box concrete It is an elastic joining method for box concrete blocks used when elastically joining blocks.
One end of the cylindrical portion of the ring packing material according to claim 1 is fitted and attached to the end opening of the sheath hole of one box concrete block to be joined before joining. By tensioning the tension material inserted through the insertion hole of the sheath hole and the ring packing material, the other end of the cylindrical portion of the ring packing material is fitted into the end opening of the sheath hole of the other box concrete block, A method for elastic joining of a box concrete block, characterized in that the flange portion of the ring packing material is compressed by sandwiching it between the joint end faces of the box concrete block, and the inner surface of the insertion hole is brought into close contact with the surface of the tension material by compression bulging. By introducing an elastic body in the joint part of the box concrete block and introducing the tension force in the box axis direction by the tension material inserted in the sheath hole along the box axis direction formed in the box concrete block, the box concrete It is an elastic joining method for box concrete blocks used when elastically joining blocks.
After inserting the tension material into the sheath hole of the box concrete block, the multiple ring packing material according to claim 2 is assembled to the tension material located in the joint portion space, and one end of the cylindrical portion is joined. The other end of the cylindrical portion of the ring packing material is inserted into the end opening of the sheath hole of the other box concrete block by fitting and attaching to the end opening of the sheath hole of one box concrete block. The box is characterized in that the end of the ring packing material is inserted, the flange portion of the ring packing material is sandwiched between the joint end faces of the box concrete block and compressed, and the inner surface of the insertion hole is brought into close contact with the surface of the tension material by compression bulging Elastic bonding method for concrete blocks.

Images