JP3839031B2 - Connecting device, connecting structure of concrete block, and concrete block usable for connecting structure - Google Patents

Description

  The present invention relates to a connecting device used for connecting concrete blocks represented by a box culvert, and a connecting structure using this connecting device.

Conventionally, a construction method is known in which a box culvert is tightened and connected via a PC steel rod as a tension material to construct a water and sewage system, a common ditch, an underground passage, and the like. The applicant has already filed several innovative methods for constructing pipes that extend in the straight direction by connecting box culverts in series (see, for example, the following patent document). Basically, the opening end face of the box culvert to be installed next is matched to the opening end face of the existing box culvert, the unbonded PC steel rods inserted through these box culverts are connected with a coupler, and then a jack is used. The PC culvert is strongly pulled to crimp the box culverts together. Then, a fixing nut is fastened and fixed to the PC steel bar in a state where a predetermined tension is applied. Thereafter, the same process is repeated according to the number of box culverts to be connected. As a result, a compressive force (prestress) is uniformly applied to the group of box culverts connected in series, and the integrity, continuity, and water tightness of the box culverts are realized.
Japanese Patent Laid-Open No. 11-061954 Japanese Patent Application No. 2003-167014

  However, the above-described method cannot be applied as it is to a portion where the pipe is bent. The bent part on the pipe can be constructed by joining the beveled surfaces, ie, the beveled surfaces of the box culverts having open end surfaces that are non-perpendicular to the extending direction, while the PC steel rod is parallel to the extending direction of the box culvert. Therefore, the axes of the PC steel bars to be connected do not intersect and are in a straight line. Therefore, if these PC steel bars are connected by a coupler and are towed by a jack, a bending moment acts on the PC steel bar, and the PC steel bar is bent, resulting in a very dangerous situation.

  For the above reasons, when connecting a box culvert having a beveled surface at a bent portion on a pipe line, a metal fitting for screwing a connecting bolt into the beveled surface is embedded in advance, and this box culvert is placed after the box culvert is placed. In general, both box culverts are connected by screwing connection bolts into the metal fittings. However, in this case, the box culverts are connected only by the connecting bolts, and the compressive force does not act. Therefore, the mutual integrity, continuity, and water tightness are not ensured.

  The present invention, which was made by paying attention to the above problems for the first time, is intended to realize a connection structure that can ensure the same integrity, continuity, and water tightness as a straight portion at a bent portion on a pipeline. Therefore, an attempt is made to provide an effective connecting device.

  In this invention, it is used in order to connect the concrete blocks in which the tension material is inserted or embedded, and includes a first connecting member and a second connecting member that are relatively rotatable, and the first connecting member is provided. A coupling device (coupler) for mounting a member on a tension member of one concrete block and mounting a second connecting member on a tension member of the other concrete block to connect both tension materials; and A connecting device is provided that includes a retainer that prevents the connecting member and the second connecting member from expanding so that the angle between the connecting member and the second connecting member is increased.

  That is, the tension members in a positional relationship where the axes intersect with each other are connected using a connector that can change the angle formed by the two connecting members corresponding to the intersecting angle, and the two connecting members are expanded. Is restrained by a restraining device. If it is such, when connecting concrete blocks, such as a box culvert which has a beveled surface, it becomes possible to connect and pull the tension material of these concrete blocks, and to give required tension force. Furthermore, at this time, both connecting members in the connecting tool are expanded, in other words, the end of the tension member to which the connecting tool is attached is the inner corner side (inward direction when the bent conduit is viewed macroscopically). ) Is prevented from being bent, and the problem of bending of the tendon due to the bending moment is avoided. Accordingly, a compressive force can be appropriately applied to the connected concrete blocks, and mutual integrity, continuity, and water tightness are realized.

  If the first connecting member, the second connecting member, and a connecting member that couples the connecting members so as to be relatively rotatable can be disassembled, the first connecting member can be used as one tension member. It is possible to take a procedure of attaching, attaching the second connecting member to the other tendon, and then connecting these connecting members by the connecting member. That is, it is possible to simplify the construction in connecting the concrete blocks.

  The retainer anchors the coupling member that couples the first coupling member and the second coupling member so as to be capable of relative rotation to the concrete block to prevent the coupling member from being displaced toward the corner. If it is a thing, since a connection tool will be hold | maintained at one place (namely, coupling member), there exists an advantage which does not need to use several holding tools in multiple places.

  If the retainer is rotatable about the axis of the coupling member, the arrangement of the retainer with respect to the connector can be appropriately changed. This not only simplifies the construction, but also improves the versatility with respect to the geometric conditions of the connected concrete blocks (intersection angle between both concrete blocks).

  The retainer is provided with a female screw, the coupling member is provided with a male screw that is screwed to the female screw, the retainer is fixed to the concrete block, and then the coupling member is screwed to the retainer. Then, it is effective in the reduction of the number of parts constituting the coupling device.

  The first connecting member or the second connecting member is formed with a groove extending substantially parallel to the extension direction of the tendon material, that is, the axial direction, and the retainer is inserted into the groove. If the connecting member or the second connecting member is locked and the retainer is fixed to the concrete block to prevent the connecting member from being displaced toward the corner, the connection The member is allowed to displace relative to the retainer along the extension direction of the tendon. Therefore, it is possible to obtain an advantageous effect that the retainer does not hinder when the tension material is pulled and tensioned.

  If the retainer is interposed between the concrete block and the first connecting member or the second connecting member and prevents the connecting member from being displaced toward the inner corner, The tool can be held easily.

  The retainer includes a female screw member and a male screw member that is screwed into the female screw member. One of the female screw member and the male screw member is fixed to the concrete block, and the other is attached to the connector. If it is to be worn, the male screw member and the female screw member can be disassembled and individually attached to the concrete block and the connecting tool, and then both can be screwed together. That is, it is possible to simplify the construction in connecting the concrete blocks.

  At least a part of the retainer is disposed between both concrete blocks to be connected, and the retainer is connected to the concrete block by tensioning the tension material connected via the connector and pressing the joint surfaces of the concrete blocks together. If it fixes to a concrete block, it can fix to a concrete block simultaneously with the process of pulling a tension material and tensioning. In addition, it is not necessary to embed a retainer in advance when manufacturing the concrete block.

  If the connecting member is configured to form a groove extending in a direction substantially perpendicular to the extension direction of the tendon, and the tendon is inserted into and locked in the groove, the tendon is attached to the connecting member. On the other hand, relative displacement along the groove is allowed. This leads to an improvement in flexibility when the connecting tool is attached to the tendon.

  If the connecting device according to the present invention is used, the first connecting member attached to the tension member of one concrete block and the second connecting member attached to the tension member of the other concrete block are coupled so as to be relatively rotatable. Then, both tendons are connected, and a restraint is provided to prevent the connecting tool from expanding so as to widen the angle formed by the first connecting member and the second connecting member. A connecting structure of blocks can be formed. With such a connection structure, it is possible to realize the same unity, continuity, and watertightness as the straight part at the bent part of the pipe.

  In addition, a first connecting member or a second connecting member, which is an element of a connector for connecting the tendon materials to a portion corresponding to the end portion of the tendon material, is embedded in the tendon material for connection. If a concrete block in which a concave groove is formed and a concave groove communicating with the concave groove is formed in an opening end face joined at the time of connection is manufactured in advance, it is extremely useful for constructing a bent portion on a pipe line. Become. That is, it is possible to fit and fix the retainer that prevents the connecting tool from expanding in the concave groove, and it is possible to easily form the connecting structure according to the present invention.

  Similarly, a first connecting member or a second connecting member, which is an element of a connecting tool for connecting the tension materials to a portion corresponding to the end portion of the tension material, is embedded in the connection tension material. It is also preferable to produce a concrete block in which a female screw member or a male screw member is embedded at a predetermined position facing the recess. If this is the case, the male screw member or the female screw member that engages with the coupler and prevents the coupler from expanding is screwed to and fixed to the female screw member or male screw member that is already embedded. Thus, the connection structure according to the present invention can be easily formed.

  According to the present invention, it is possible to ensure the same integrity, continuity, and watertightness as those of a straight line part even in a bent part on a pipeline.

  <First Embodiment> An embodiment of the present invention will be described below with reference to the drawings. First, the basic configuration of a concrete block and a tendon common to each embodiment will be outlined. As shown in FIG. 1, a box culvert 1 as a concrete block is used for connecting a plurality of pipes and constructing pipes such as water and sewage systems, common grooves, and underground passages. The side walls 13 and 14 are precast concrete members having a rectangular tube shape. Thick fillet portions (haunches) 15 are provided at the four corners of the inner periphery, and tension material insertion holes 16 extending along the extending direction of the box culvert 1 are formed in the fillet portions 15. Further, a recess 17 is formed on the opening end face of the box culvert 1 so as to cut out the fillet portion 15. The tendon insertion hole 16 opens into the recess 17. The recess 17 communicates with the inner periphery of the box culvert 1, and the connecting device 3 can be installed in the recess 17 from the inner periphery side in a state where the opening end faces of the box culvert 1 are close to or in close contact with each other. Is possible.

  The unbonded PC steel rod 2 as a tension material is inserted and disposed in the tension material insertion hole 16. It goes without saying that the PC steel bar 2 may be inserted into the tension material insertion hole 16 at the time of construction of the pipe line, or may be embedded in advance at the time of manufacturing the box culvert 1 (or at the time of placing concrete). Yes. Both ends of the PC steel rod 2 are exposed in the recesses 17. Male screws 21 are cut at both ends of the PC steel bar 2. In general, the box culverts 1 to be connected are installed so that the opening end surfaces of the box culverts are close to each other, and the close ends of the PC steel rods 2 of the box culverts 1 are connected to each other via the connecting device 3. The box culvert 1 is crimped and connected by pulling and applying tension to the PC steel rod 2.

  A joint rubber 4 is often disposed on the opening end face of the box culvert 1. The joint rubber 4 is a joint sealing material that fills the gap between the box culverts 1. For example, the joint rubber 4 is made of water-expanded rubber as a base material and has an annular shape that fits in an intermediate region between the inner periphery and the outer periphery of the opening end surface.

  In the case of constructing a straight pipe line, box culverts 1X having an outer shape whose opening end surface is perpendicular to the extending direction and having a substantially rectangular parallelepiped shape are connected in series. On the other hand, when constructing a bent or curved pipe line, the box culvert 1 whose opening end face is a beveled face 18 that is not perpendicular to the extending direction is used. That is, the bend portion of the conduit is constructed by joining the beveled surfaces 18 of the box culvert 1 having the beveled surfaces 18 together. The box culvert 1 having the beveled surface 18 can be manufactured by diverting a formwork used for manufacturing a normal box culvert 1 having no beveled surface 18. When the oblique surfaces 18 of the box culvert 1 are joined together, the axes of the PC steel bars 2 to be connected are in a crossing relationship, and they are not in a straight line. The connecting device 3 according to the present invention can suitably connect the PC steel rods 2 having such a crossing positional relationship.

  Hereinafter, the connection device 3 of the present embodiment will be described in detail. As shown in FIG. 2 to FIG. 4, the connecting device 3 pulls the connecting tool 4 for connecting the PC steel bar 2 of the box culvert 1 to be connected, and the PC steel bar 2 connected via the connecting tool 4. And a retainer 5 that prevents the connector 4 from being displaced to the inside corner of the pipe. The connector 4 includes a first connecting member 411 attached to one PC steel rod 2 and a second connecting member 412 attached to the other PC steel rod 2.

  The first connecting member 411 is provided with a female screw hole 411a on one end side of a substantially cylindrical main body and a pair of extending bodies 411b extending in parallel to the axial direction on the other end side. The end of the PC steel rod 2 in which the male screw 21 is formed can be screwed into the female screw hole 411a. The extension body 411b faces the axial center of the main body in a symmetrically spaced manner and has a gap in between. Both extending bodies 411b are provided with shaft holes 411c penetrating in the radial direction of the main body.

  The second connecting member 412 is a substantially hexagonal columnar member having a cross-sectional dimension that can be inserted into the gap in the first connecting member 411, and has a female screw hole 412a on one end side, and on the other end side. A shaft hole 412b penetrating in the radial direction is formed. The end of the PC steel rod 2 can be screwed into the female screw hole 412a.

  The first connecting member 411 and the second connecting member 412 are coupled so as to be rotatable relative to each other via a hinge shaft 61 as a coupling member. That is, the other end side of the second connecting member 412 is inserted into the gap on the other end side of the first connecting member 411, and the hinge shaft 61 is inserted into the shaft holes of the both connecting members 411, 412, thereby connecting each connecting member. 411 and 412 can rotate around the hinge shaft 61.

  The retainer 5 plays a role of mooring the connector 4 for connecting the PC steel rod 2 to the box culvert 1. The retainer 5 includes a male screw member 511 and a female screw member 512 that is screwed to the male screw member 511. The male screw member 511 is substantially U-shaped, and male screws 511a are cut at both ends thereof. The male screw member 511 is fixed to the box culvert 1. More specifically, as illustrated in FIG. 5, it is possible to fit the curved portion of the male screw member 511 into one or both opening end surfaces (that is, the oblique surface 18) of the box culvert 1 to be connected. And the male screw member 511 is fixed to the box culvert 1 by press-contacting the opening end surfaces of the two box culverts 1 after fitting the corresponding portion of the male screw member 511 into the concave groove 191 in advance. I am going to do it. The recessed groove 191 communicates with the recessed portion 17, and its end protrudes into the recessed portion 17 when the male screw member 511 is fitted.

  The female screw member 512 is attached to the connector 4, and is provided with a nut 512 b having a female screw hole 512 c that is screwed into an end portion of the male screw member 511 in an annular body 512 a through which the hinge shaft 61 can be inserted. . The female screw hole 512c penetrates the nut 512b along the radial direction of the annular body 512a.

  However, it does not interfere with the aspect in which a female screw hole is provided at both ends of a substantially U-shaped member to be a female screw member, and a male screw that is screwed into the female screw hole is provided on the annular body to be a male screw member. In this case, the female screw member is fixed to the box culvert 1 and the male screw member is attached to the connector 4.

  When the construction procedure of the connection of the box culvert 1 using the connection device 3 of the present embodiment is described, the first connection member 411 is screwed to the end portion of the PC steel rod 2 arranged in the existing box culvert 1, The second connecting member 412 is screwed onto the end of the PC steel bar 2 disposed on the newly laid box culvert 1. Further, the curved portion of the male screw member 511 is fitted into the concave groove 191 formed on the opening end face of the existing box culvert 1, and temporarily fixed with an adhesive tape or an adhesive.

  Next, the box culvert 1 to be newly laid is placed on a foundation (not shown) so that the opening end faces of both box culverts 1 are close to each other. Subsequently, the first connecting member 411 and the second connecting member 412 are rotated about their axes so that the other end side of the second connecting member 412 enters the gap on the other end side of the first connecting member 411. The positions of the connecting members 411 and 412 are adjusted. In addition, the female screw member 512 is screwed onto the end of the male screw member 511 protruding into the recess 17, and the shaft holes 411 c and 412 b of both the connecting members 411 and 412 and the annular body 512 a of the female screw member 512 are on the concentric axis. Arrange them side by side. Then, the hinge shaft 61 is inserted through the shaft holes 411 c and 412 b of both the connecting members 411 and 412 and the annular body 512 a of the female screw member 512. As a result, the first connecting member 411 and the second connecting member 412 are coupled to each other via the hinge shaft 61 so as to be relatively rotatable, and the PC steel rods 2 of both the box culverts 1 are connected.

  Thereafter, the anchor plate 71 and the fixing nut 72 are temporarily attached to the PC steel bar 2 at the anti-connection end of the newly laid box culvert 1, and a tension is applied by pulling the PC steel bar 2 using a jack. . Then, the open end surfaces of the two box culverts 1 are brought into pressure contact with each other, and the male screw member 511 is sandwiched and completely fixed. At the same time, a resultant force in the direction toward the inner corner of the pipe line acts on the hinge shaft 61 that couples the connecting members 411 and 412, and this hinge shaft 61 is moored to the box culvert 1 via the retainer 5. Therefore, there is no displacement toward the entrance corner side of the pipe line. Therefore, it is avoided that a bending moment acts on the end part of the connected PC steel bar 2. When the tension applied to the PC steel bar 2 exceeds a required magnitude, the fixing nut 72 is tightened to fix the PC steel bar 2 in a state where the tension is maintained. Thus, the connection process of the box culvert 1 is completed.

  According to the present embodiment, the first connecting member 411 and the second connecting member 412 that are relatively rotatable are provided, and the first connecting member 411 is attached to the PC steel rod 2 of one box culvert 1, Two connecting members 412 are attached to the PC steel rod 2 of the other box culvert 1 to connect the two PC steel rods 2, and the connecting device 4 includes the first connecting member 411 and the second connecting member 412. Since the connecting device 3 including the retainer 5 that suppresses expansion so as to widen the angle formed with the connecting member 412 is used, the PC steel rods 2 in a positional relationship where the axes intersect with each other, It can connect using the connector 4 which can change the angle which both the connection members 411 and 412 make corresponding to an intersection angle. Therefore, when connecting the box culverts 1 and the like having the oblique surfaces 18, it is possible to appropriately connect the PC steel bars 2 of the box culverts 1 and to pull the PC steel bars 2 to give the required tension. Become. Furthermore, since both the connection members 411 and 412 in the connection tool 4 are expanded, in other words, the end portion of the PC steel rod 2 to which the connection tool 4 is attached is prevented from being displaced toward the corner of the entrance, The problem of bending of the PC steel rod 2 due to the bending moment acting on the PC steel rod 2 is avoided. Generally speaking, a compressive force can be applied appropriately to the box culvert 1 connected to construct a bent part on a pipe line, and the same unity, continuity, and watertightness as a straight part can be realized even in a bent part. It becomes.

  The first connecting member 411, the second connecting member 412, and the hinge shaft 61 that couples the connecting members 411 and 412 so as to be relatively rotatable can be disassembled. Can be attached to one PC steel rod 2, the second connecting member 412 can be attached to the other PC steel rod 2, and then the connecting members 411 and 412 can be coupled by the hinge shaft 61. That is, the construction in the connection of the box culvert 1 can be simplified.

  The retainer 5 anchors a hinge shaft 61 that couples the first connecting member 411 and the second connecting member 412 so as to be capable of relative rotation to the box culvert 1 so that the hinge shaft 61 moves toward the corner. In order to suppress displacement, the connector 4 can be held at one place (that is, the hinge shaft 61), and a plurality of holders 5 need not be used at a plurality of places.

  Since the retainer 5 is rotatable around the axis of the hinge shaft 61, the arrangement of the retainer 5 with respect to the connector 4 can be appropriately changed. This not only simplifies the construction, but also improves the versatility with respect to the geometrical conditions of the box culverts 1 to be connected (intersection angles of the two box culverts 1).

  The retainer 5 includes a female screw member 512 and a male screw member 511 that is screwed into the female screw member 512, and fixes one of the female screw member 512 and the male screw member 511 to the box culvert 1. Since the other is attached to the connector 4, the male screw member 511 and the female screw member 512 are disassembled and individually attached to the box culvert 1 and the connector 4, and then screwed together. It can take. That is, the construction in the connection of the box culvert 1 can be simplified.

  At least a part of the retainer 5 (that is, the curved portion of the male screw member 511) is disposed between both box culverts 1 to be connected, and the PC steel rod 2 connected via the connector 4 is tensioned to form a box. In order to fix the retainer 5 to the box culvert 1 by pressing the joining surfaces (that is, the oblique surfaces 18) of the culvert 1 together, the retainer 5 is attached to the box culvert 1 simultaneously with the process of pulling and tensioning the PC steel rod 2. Can be firmly established. In addition, a process for embedding the retainer 5 in advance when the box culvert 1 is manufactured becomes unnecessary.

  If the connecting device 3 is used, a first connecting member 411 attached to the PC steel rod 2 of one box culvert 1 and a second connecting member 412 attached to the PC steel rod 2 of the other box culvert 1 are provided. The two steel bars 2 are coupled so as to be relatively rotatable, and the angle between the first coupling member 411 and the second coupling member 412 is determined by the coupling tool 4 via the retainer 5. The connection structure of the box culvert 1 which restrained to expand so that it may expand can be formed. With such a connection structure, it is possible to realize the same unity, continuity, and watertightness as the straight part at the bent part of the pipe.

  Moreover, the unbonded PC steel rod 2 for connection is embedded, and the first connecting member 411 or the second connecting member 412 that is an element of the connector 4 is disposed in a portion corresponding to the end of the PC steel rod 2. If the concrete block 1 in which the concave groove 17 191 is formed in advance and the concave groove 191 communicating with the concave groove 17 is formed in the opening end face 18 to be joined at the time of connection, the bent portion on the pipe line is formed. It will be extremely useful for building. That is, the retainer 5 (a male screw member 511 forming a part of the retainer 5) that suppresses the expansion of the connector 4 can be fitted into the concave groove 191, and can be fixed. It becomes possible to form.

  <Second Embodiment> The connecting device 3 of the present embodiment is configured to directly hold the hinge shaft 62 that couples the first connecting member 421 and the second connecting member 422 so as to be relatively rotatable to the concrete block. It is characterized by that. Hereinafter, the connection device 3 of the present embodiment will be described in detail.

  As shown in FIGS. 6 to 7, the first connecting member 421 in the present embodiment is a bearing body 421b having a shaft hole 421c in a body having a partially cylindrical shape obtained by cutting a part of a pipe material such as a carbon steel pipe. Is provided. The main body of the first connecting member 421 mainly has a peripheral wall cut in a range of an angle smaller than a half circumference in plan view, and has an insertion hole 421a through which the PC steel rod 2 is inserted. The bearing body 421b is a plate-like body having a substantially square shape in plan view that is bent at an angle corresponding to the cutout range of the peripheral wall of the main body, and is attached to the inside of the main body by welding or the like in a substantially horizontal posture. The shaft hole 421c is formed in the center of the bearing body 421b, and penetrates the bearing body 421b in the axial direction of the main body, in other words, vertically. In the present embodiment, a plurality of bearing bodies 421b that are spaced apart from each other in the axial direction are provided. In the illustrated example, the bearing body 421b is attached at a position slightly below the upper end of the main body and in the vicinity of the lower end. Further, a protrusion 421d protruding upward is formed at the edge of the bearing body 421b on the main body side.

  The second connecting member 422 also has a main body having a partial cylindrical shape and a bearing body 422b having a shaft hole. The main body of the second connecting member 422 mainly has a peripheral wall cut in a range of an angle smaller than a half circumference in plan view, and has an insertion hole 422a through which the PC steel rod 2 is inserted. The bearing body 422b is a plate-like body having a substantially square shape in plan view that is bent at an angle corresponding to the cut-out range of the peripheral wall of the main body, and is attached to the inner side of the main body by welding or the like in a substantially horizontal posture. The shaft hole 422c is formed at the center of the bearing body 421b and penetrates the bearing body 421b vertically. In the present embodiment, a plurality of bearing bodies 422b that are spaced apart and face each other in the axial direction are provided. In the illustrated example, the bearing body 422b is attached to the vicinity of the upper end of the main body and a position slightly above the lower end. Further, a protrusion 422d protruding downward is formed on the edge of the bearing body 422b on the main body side.

  The first connecting member 421 and the second connecting member 422 are coupled to each other so as to be rotatable relative to each other via a bolt 62 serving as a coupling member. That is, the bearing body 421b of the first connecting member 421 and the bearing body 422b of the second connecting member 422 are substantially overlapped so that the shaft holes 421c and 422c are arranged on the concentric shaft, and the shaft holes 421c and 422c are aligned. By inserting the bolt 62, each of the connecting members 421 and 422 can be rotated around the shaft portion of the bolt 62. That is, the shaft portion of the bolt 62 functions as a hinge shaft. At this time, the bearing bodies 421b and 422b of the both coupling members 421 and 422 are alternately arranged, and if one coupling member is rotated with respect to the other, the bearing bodies 421b and 422b are within a predetermined range. Will not interfere with each other. A male screw 62 a is cut at the tip of the bolt 62.

  The retainer 5 in the present embodiment is a square nut 521 (high nut) to which a bolt 62 that joins the first connecting member 421 and the second connecting member 422 is screwed. The square nut 521 has a female screw hole 521 a that engages with a male screw 62 a formed at the tip portion of the bolt 62, and is fixed to the box culvert 1. More specifically, as illustrated in FIG. 8, a recess 192 into which the square nut 521 can be fitted is formed in advance on one or both opening end faces of the box culvert 1 to be coupled, After the nut 521 is fitted in the concave groove 192, the square nut 521 is fixed to the box culvert 1 by press-contacting the open end faces of both box culverts 1. The recessed groove 192 communicates with the recessed portion 17, and the female screw hole 62 a is exposed in the recessed portion 17 when the square nut 521 is fitted.

  The construction procedure of the connection of the box culvert 1 using the connection device 3 of the present embodiment will be described. The first connection member 421 is attached to the end of the PC steel bar 2 arranged in the existing box culvert 1, A second connecting member 422 is attached to the end of the PC steel rod 2 disposed on the box culvert 1 to be laid. In the present embodiment, the PC steel rod 2 is inserted from the outside through the insertion holes 421a and 422a formed in the main bodies of the connecting members 421 and 422, and the special nut 423 is screwed to the end portion of the PC steel rod. 2 is locked to the connecting members 421 and 422. Incidentally, the seating surface of the special nut 423 is formed in a curved surface shape substantially corresponding to the inner peripheral surface of the main body of the connecting members 421 and 422. Further, a square nut 521 is fitted into a concave groove 192 formed on the opening end face of the existing box culvert 1 and temporarily fixed with an adhesive tape, an adhesive, or the like.

  Next, the box culvert 1 to be newly laid is placed on the foundation so that the opening end faces of both box culverts 1 are close to each other. Subsequently, the special nut 423 is rotated around the axis to adjust the positions of the first connecting member 421 and the second connecting member 422, and the shaft holes 421 c and 422 c of both the connecting members 421 and 422 and the female screw of the square nut 521 are adjusted. It arrange | positions so that the hole 521a may be located in a line on a concentric axis | shaft. After the washers 424 are arranged above and below the connecting members 421 and 422, the bolts 62 are inserted into the shaft holes 421 c and 422 c of the connecting members 421 and 422 and screwed into the female screw holes 521 a of the square nuts 521. As a result, the first connecting member 421 and the second connecting member 422 are coupled to each other via the shaft portion of the bolt 62 so as to be relatively rotatable, and the PC steel rods 2 of both the box culverts 1 are connected.

  Thereafter, the anchor plate 71 and the fixing nut 72 are temporarily attached to the PC steel bar 2 at the anti-connection end of the newly laid box culvert 1, and a tension is applied by pulling the PC steel bar 2 using a jack. . Then, the open end surfaces of the two box culverts 1 are brought into pressure contact with each other, and the square nut 521 is sandwiched and completely fixed. At the same time, the bolt 62 connecting both the connecting members 421 and 422 is subjected to a resultant force in the direction toward the inner corner of the pipe line. The bolt 62 is held by the box culvert 1 via the square nut 521. Therefore, there is no displacement toward the entrance corner side of the pipeline. Therefore, it is avoided that a bending moment acts on the end part of the connected PC steel bar 2. When the tension applied to the PC steel bar 2 exceeds a required magnitude, the fixing nut 72 is tightened to fix the PC steel bar 2 in a state where the tension is maintained. Thus, the connection process of the box culvert 1 is completed.

  According to the present embodiment, the first connecting member 421 and the second connecting member 422 that are relatively rotatable are provided, the first connecting member 421 is mounted on the PC steel rod 2 of one box culvert 1, Two connecting members 422 are attached to the PC steel rod 2 of the other box culvert 1 to connect the two PC steel rods 2, and the connecting device 4 is connected to the first connecting member 421 and the second connecting member 421. Since the connecting device 3 including the retainer 5 that suppresses the expansion so as to widen the angle formed with the connecting member 422 is used, the PC steel bars 2 in a positional relationship where the axes intersect with each other, It can connect using the connector 4 which can change the angle which both the connection members 421 and 422 make corresponding to a crossing angle. Therefore, when connecting the box culverts 1 and the like having the oblique surfaces 18, it is possible to appropriately connect the PC steel bars 2 of the box culverts 1 and to pull the PC steel bars 2 to give the required tension. Become. Furthermore, since both the connection members 421 and 422 in the connection tool 4 are expanded, in other words, the end of the PC steel rod 2 to which the connection tool 4 is attached is prevented from being displaced toward the corner of the entrance, The problem of bending of the PC steel rod 2 due to the bending moment acting on the PC steel rod 2 is avoided. Generally speaking, a compressive force can be appropriately applied to the box culvert 1 connected to construct a bent portion on a pipe line, and the same integrity, continuity, and water tightness as a straight portion can be realized even in the bent portion. It becomes.

  The first connecting member 421, the second connecting member 422, and the bolts 62 that connect the connecting members 421 and 422 so as to be relatively rotatable can be disassembled. It is possible to take a procedure of attaching to one PC steel rod 2, attaching the second connecting member 422 to the other PC steel rod 2, and then connecting these connecting members 421 and 422 with bolts 62. That is, the construction in the connection of the box culvert 1 can be simplified.

  The square nut 521 which is the retainer 5 anchors the bolt 62 which couples the first connecting member 421 and the second connecting member 422 so as to be relatively rotatable to the box culvert 1, and the bolt 62 is inserted into the corner. In order to suppress displacement to the side, the connector 4 can be held at one place (that is, the bolt 62), and a plurality of holders 5 need not be used at a plurality of places.

  The square nut 521 is provided with a female screw, the bolt 62 is provided with a male screw that is screwed to the female screw, the square nut 521 is fixed to the box culvert 1, and then the bolt 62 is screwed to the square nut 521. Therefore, it is effective in reducing the number of parts constituting the coupling device 3.

  The square nuts 521 are disposed between the two box culverts 1 to be connected, and the PC steel rods 2 connected via the connector 4 are tensioned to join the joint surfaces of the box culverts 1 (that is, the oblique surfaces 18). Since the square nut 521 is fixed to the box culvert 1 through the pressure contact, the square nut 521 can be reliably fixed to the box culvert 1 simultaneously with the step of pulling and tensioning the PC steel rod 2. In addition, a process for embedding the square nuts 521 in advance when the box culvert 1 is manufactured becomes unnecessary.

  If the connecting device 3 according to the present invention is used, the first connecting member 421 attached to the PC steel rod 2 of one box culvert 1 and the second connecting member attached to the PC steel rod 2 of the other box culvert 1. 422 is coupled to each other so as to be relatively rotatable, and both the PC steel rods 2 are coupled to each other, and the coupling 4 is connected to the first coupling member 421 and the second coupling by the screwing of the bolt 62 and the square nut 521. It is possible to form a connection structure of the box culvert 1 that is prevented from being expanded so as to increase the angle formed with the connection member 422. With such a connection structure, it is possible to realize the same unity, continuity, and watertightness as the straight part at the bent part of the pipe.

  Moreover, the unbonded PC steel rod 2 for connection is embedded, and the first connection member 421 or the second connection member 422 that is an element of the connector 4 is disposed at a portion corresponding to the end of the PC steel rod 2. If the concrete block 1 in which the concave groove 192 communicating with the concave portion 17 is formed in the opening end face 18 that is joined at the time of connection is formed in advance, the bent portion on the pipe line It will be extremely useful for building. That is, the retainer 521 that prevents the connecting member 4 from being expanded by being screwed to the coupling member 62 can be fitted into the concave groove 192 and fixed, and the connecting structure of the present embodiment is simply formed. It becomes possible.

  <Third Embodiment> The connecting device 3 of this embodiment is characterized in that each of the first connecting member 431 and the second connecting member 432 is held in a concrete block. Hereinafter, the connection device 3 of the present embodiment will be described in detail.

  As shown in FIGS. 9 to 12, the first connecting member 431 in this embodiment is bent at one end side of the parallel plate portion 431a and the parallel plate portion 431a and extends substantially perpendicular to the parallel plate portion 431a. A vertical plate portion 431b and a reinforcing plate portion 431c that is joined to the parallel plate portion 431a and the vertical plate portion 431b and orthogonal to each other are provided. The parallel plate portion 431a is a portion that is substantially parallel to the extending direction of the PC steel rod 2 when the first connecting member 431 is attached to the PC steel rod 2, and extends substantially parallel to the PC steel rod 2. The parallel groove 431d is cut out. The other end side of the parallel plate portion 431a is curved to form a cylindrical bearing body 431e including the shaft hole. In the illustrated example, a bearing body 431e is provided in the middle of the vertical width of the parallel plate portion 431a. The vertical plate portion 431b is a portion that is substantially perpendicular to the extending direction of the PC steel rod 2 when the first connecting member 431 is attached to the PC steel rod 2, and is in a direction substantially orthogonal to the PC steel rod 2. The extending locking groove 431f is cut out. The parallel groove 431d and the locking groove 431f are an integral groove hole. The groove width of the locking groove 431f is set to a size substantially corresponding to the diameter dimension of the PC steel rod 2. The reinforcing plate portion 431c is a thin plate body having a substantially triangular shape in a plan view and joined to an inner angle side of a substantially L shape in a plan view formed by the parallel plate portion 431a and the vertical plate portion 431b. Further, a projecting piece 431g is provided on the outer surface of the parallel plate portion 431a (the surface on the side opposite to the reinforcing plate portion 431c). In the illustrated example, a short columnar shape is formed and attached to the vicinity of the upper and lower ends of the bearing body 431e.

  The second connecting member 432 also includes a parallel plate portion 432a, a vertical plate portion 432b that bends at one end side of the parallel plate portion 432a and extends substantially perpendicular to the parallel plate portion 432a, and the parallel plate portion 432a and the vertical plate portion 432a. A reinforcing plate portion 432c that is joined to the plate portion 432b and orthogonal to each other is provided. The parallel plate portion 432a is a portion that is substantially parallel to the extending direction of the PC steel rod 2 when the second connecting member 432 is attached to the PC steel rod 2, and extends substantially parallel to the PC steel rod 2. The parallel groove 432d is cut away. The other end side of the parallel plate portion 432a is curved to form a cylindrical bearing body 432e containing the shaft hole. In the illustrated example, bearing bodies 432e are provided apart from each other in the vicinity of the upper end and the lower end of the parallel plate portion 432a. The vertical plate portion 432b is a portion that is substantially perpendicular to the extending direction of the PC steel rod 2 when the second connecting member 432 is attached to the PC steel rod 2, and is in a direction substantially orthogonal to the PC steel rod 2. The extending locking groove 432f is cut out. The parallel groove 432d and the locking groove 432f are an integral groove hole. The groove width of the locking groove 432f is set to a size substantially corresponding to the diameter dimension of the PC steel rod 2. The reinforcing plate portion 432c is a thin plate body having a substantially triangular shape in plan view that is joined to an inner angle side of a substantially L shape in plan view formed by the parallel plate portion 432a and the vertical plate portion 432b. Moreover, the protrusion 432g is provided in the outer surface of the parallel plate part 432a. In the illustrated example, it is attached in the vicinity of a bearing body 432e that has a short columnar shape and is vertically spaced. The projecting piece 432g functions to increase the rigidity of the connecting members 431 and 432.

  The first connecting member 431 and the second connecting member 432 are coupled to each other so as to be rotatable relative to each other via a hinge shaft 63 serving as a coupling member. That is, the bearing body 431e of the first connecting member 431 and the bearing body 432e of the second connecting member 432 are substantially overlapped and arranged on a concentric shaft, and the hinge shaft 63 is inserted into the bearing bodies 431e and 432e. As a result, the connecting members 431 and 432 can rotate around the hinge shaft 63. At this time, the bearing bodies 431e and 432e of the two coupling members 431 and 432 are alternately arranged, and even if one coupling member is rotated with respect to the other, the bearing bodies 431e and 432e do not interfere with each other. . In the present embodiment, the hinge shaft 63 cannot be removed from the shaft hole, and the first connecting member 431 and the second connecting member 432 cannot be separated. However, as in the first embodiment, it is possible to separate the first connecting member 431 and the second connecting member 432 as the hinge shaft 63 can be freely inserted and removed.

  As will be described later, the connector 4 of the present embodiment is arranged on the entry corner side (inward when the bending pipeline is viewed macroscopically) and on the exit corner side (bends). The mode of use differs depending on whether the pipe is arranged macroscopically. The retainer 5 is also different from the one that retains the connector 4 disposed on the entrance corner side of the bent conduit and the one that retains the connector 4 disposed on the exit corner side. The retainer 5 used on the entrance corner side of the pipe line is a spacer 531, 532 interposed between the inner wall surface of the recess 17 of the box culvert 1 and the outer surface of the first connecting member 431 or the second connecting member 432. It is. The spacers 531 and 532 of this embodiment abut against the outer surfaces of the parallel plate portions 431a and 432a of the connecting members 431 and 432, and prevent the connecting members 431 and 432 from being displaced toward the inner corners of the pipes. . Both the spacer 531 interposed between the recess 17 and the first connecting member 431 and the spacer 532 interposed between the recess 17 and the second connecting member 432 have a surface shape similar to the parallel plate portions 431a and 432a. A notch 531a and 532a for accommodating at least a part of the protruding pieces 431g and 432g is formed on the side end of the plate-like body.

  The retainer 5 used on the exit corner side of the pipe has elements of a male screw member 533 and a female screw member 534 that is screwed to the male screw member 533. The male screw member is a bolt 533 having a male screw cut at a tip portion thereof, and the shaft portion thereof is inserted into the parallel grooves 431d and 432d of the first connecting member 431 or the second connecting member 432, and the head is connected to the parallel groove 431d. It can be locked to the edge of 432d. That is, the bolt 533 can be attached to the connecting members 431 and 432 by inserting the shaft portion into the parallel groove 431d. The female screw member is an insert nut 534 to which the bolt 533 is screwed. The insert nut 534 has a female screw hole 534 a that engages with a male screw 533 a formed at the tip portion of the bolt 533, and is fixed to the box culvert 1. In the present embodiment, at the time of manufacturing the box culvert 1, it is embedded in advance at a predetermined position facing the recess 17.

  However, a female screw hole is provided in a member locked to the parallel grooves 431d and 432d of the connecting members 431 and 432, this is used as a female screw member, and a male screw screwed into the female screw hole is inserted into an insert member embedded in the box culvert 1. The aspect which is provided and used as a male screw member is not hindered. In this case, the female screw member is fixed to the box culvert 1 and the male screw member is attached to the connector 4.

  The construction procedure for connecting the box culverts 1 using the connecting device 3 of the present embodiment will be described. The newly laid box culverts 1 are placed on the foundation, and the open end faces of the two box culverts 1 are brought close to each other. Next, the first connecting member 431 is attached to the end of the PC steel bar 2 disposed on the existing box culvert 1, and the first connection member 431 is attached to the end of the PC steel bar 2 disposed on the newly installed box culvert 1. The second connecting member 432 is attached. In the present embodiment, the PC steel rod 2 is inserted from the outside into the locking grooves 431f and 432f formed in the vertical plate portions 431b and 432b of the connecting members 431 and 432, and the washer 433 and the nut 434 are screwed into the end portions. By wearing, the PC steel bar 2 is locked to the connecting members 431 and 432. As a result, the first connecting member 431 and the second connecting member 432 are connected to the PC steel rods 2 of both box culverts 1. As shown in FIG. 9, at the entrance corner side of the conduit constructed by the box culvert 1, the connection members 431 and 432 are connected so that the outer surfaces of the parallel plate portions 431a and 432a face the entrance corner side. The tool 4 is installed. In addition, as shown in FIG. 10, on the exit corner side of the conduit, the connector 4 is installed so that the outer surfaces of the parallel plate portions 431 a and 432 a of the coupling members 431 and 432 face the exit corner side.

  Subsequently, a retainer 5 that retains the connector 4 is disposed. On the entrance corner side of the duct, spacers 531 and 532 are inserted between the inner wall surface of the recess 17 of the box culvert 1 and the outer surface of the parallel plate portions 431a and 432a of the connecting members 431 and 432, and the parallel plate portions 431a, 431a, The notches 531a and 532a formed at the side ends of the spacers 531 and 532 are engaged with the projecting pieces 431g and 432g provided on the 432a. On the exit corner side of the pipeline, the bolt 533 is inserted from the entrance corner side of the pipeline through the washer 535 through the parallel grooves 431d and 432d formed in the parallel plate portions 431a and 432a of the connecting members 431 and 432, The box culvert 1 is screwed into the female screw hole 534 a of the insert nut 534 embedded in the inner wall surface of the recess 17 of the box culvert 1.

  Thereafter, the anchor plate 71 and the fixing nut 72 are temporarily attached to the PC steel bar 2 at the anti-connection end of the newly laid box culvert 1, and a tension is applied by pulling the PC steel bar 2 using a jack. . Then, the open end faces of the two box culverts 1 come into pressure contact with each other. At the same time, the resultant force in the direction toward the inner corner of the pipe line acts on both connecting members 431 and 432, and these connecting members 431 and 432 are connected to the box culvert 1 via spacers 531 and 532 or bolts 533 and insert nuts 534. Therefore, there is no displacement toward the inner corner of the pipe line. Therefore, it is avoided that a bending moment acts on the end part of the connected PC steel bar 2. When the tension applied to the PC steel bar 2 exceeds a required magnitude, the fixing nut 72 is tightened to fix the PC steel bar 2 in a state where the tension is maintained. Thus, the connection process of the box culvert 1 is completed.

  According to the present embodiment, the first connecting member 431 and the second connecting member 432 that are relatively rotatable are provided, the first connecting member 431 is mounted on the PC steel rod 2 of one box culvert 1, A second connecting member 432 is attached to the PC steel rod 2 of the other box culvert 1 to connect the two PC steel rods 2, and the connecting tool 4 is connected to the first connecting member 431 and the second Since the connecting device 3 including the retainer 5 that suppresses the expansion so as to widen the angle formed with the connecting member 432 is used, the PC steel bars 2 in a positional relationship where the axes intersect with each other, It can connect using the connector 4 which can change the angle which both the connection members 431 and 432 make corresponding to a crossing angle. Therefore, when connecting the box culverts 1 and the like having the oblique surfaces 18, it is possible to appropriately connect the PC steel bars 2 of the box culverts 1 and to pull the PC steel bars 2 to give the required tension. Become. Furthermore, since both the connection members 431 and 432 in the connection tool 4 are expanded, in other words, the end portion of the PC steel rod 2 to which the connection tool 4 is attached is prevented from being displaced toward the corner of entry, The problem of bending of the PC steel rod 2 due to the bending moment acting on the PC steel rod 2 is avoided. Generally speaking, a compressive force can be applied appropriately to the box culvert 1 connected to construct a bent part on a pipe line, and the same unity, continuity, and watertightness as a straight part can be realized even in a bent part. It becomes.

  The bolt 533 is locked to the first connecting member 431 or the second connecting member 432 in a state where the bolt 533 is inserted into the parallel grooves 431d and 432d on the exit corner side of the pipe, and the bolt 533 is inserted into the insert nut. Since the connection members 431 and 432 are prevented from being displaced toward the inner corner side by being fixed to the box culvert 1 via 534, the connection members 431 and 432 are bolts 533 and inserts serving as the retainer 5. Relative displacement along the extending direction of the PC steel rod 2 with respect to the nut 534 is allowed. Therefore, the advantageous effect that the retainer 5 is not hindered when the PC steel rod 2 is pulled and tensioned can be obtained.

  Spacers 531 and 532 serving as retainers 5 are interposed between the box culvert 1 and the first connecting member 431 or the second connecting member 432 on the entrance corner side of the pipe line. Therefore, it is possible to hold the connector 4 easily, and to fix the connector 4 and the retainer 5 to the box culvert 1. It is not necessary to go through a special processing procedure.

  The retainer 5 on the exit corner side of the pipe line includes a female screw member 534 and a male screw member 533 that is screwed into the female screw member 534, and one of the female screw member 534 and the male screw member 533 is connected to the box. Since it is fixed to the culvert 1 and the other is attached to the connector 4, the male screw member 533 and the female screw member 534 are disassembled and individually attached to the box culvert 1 and the connector 4. The procedure of screwing can be taken. That is, the construction in the connection of the box culvert 1 can be simplified.

  Locking grooves 431f and 432f extending in a direction substantially perpendicular to the extending direction of the PC steel rod 2 are formed in the connecting members 431 and 432, and the PC steel rod 2 is inserted into the locking grooves 431f and 432f. Since it is configured to be stopped, the PC steel rod 2 is allowed to be relatively displaced along the locking grooves 431f and 432f. Therefore, the flexibility at the time of attaching the connector 4 to the PC steel rod 2 is improved.

If the connecting device 3 is used, a first connecting member 431 attached to the PC steel rod 2 of one box culvert 1 and a second connecting member 432 attached to the PC steel rod 2 of the other box culvert 1 are provided. The two steel bars 2 are coupled so as to be relatively rotatable, and the angle between the first coupling member 431 and the second coupling member 432 is determined by the coupling tool 4 via the retainer 5. The connection structure of the box culvert 1 which restrained to expand so that it may expand can be formed. With such a connection structure, it is possible to realize the same unity, continuity, and watertightness as the straight part at the bent part of the pipe.
The procedure of screwing both together later can be taken. That is, it is possible to simplify the construction in connecting the box culverts.

  Moreover, the unbonded PC steel rod 2 for connection is embedded, and the first connection member 431 or the second connection member 432 which is an element of the connector 2 is disposed in a portion corresponding to the end of the PC steel rod 2. If a concrete block 1 in which an internal thread member 534 (or an external thread member) is embedded in a predetermined position facing the recess 17 is formed in advance, a bent portion on the pipe line is constructed. It is extremely useful for doing so. That is, the male screw member 533 (or female screw member) that engages with the connector 4 and prevents the connector 4 from expanding is screwed onto the already-embedded female screw member 534 (or male screw member). It is possible to easily form the connection structure of the present embodiment.

  <Fourth Embodiment> This embodiment is a modification of the coupling member that couples the first coupling member 431 and the second coupling member 432 in the third embodiment so as to be relatively rotatable. The following description will focus on the differences from the third embodiment.

  As shown in FIGS. 13 to 15, in the first connecting member 431 in the present embodiment, instead of providing the bearing body 431e on the other end side of the parallel plate portion 431a, one end of the other end of the parallel plate portion 431a is provided. The part is extended along the extending direction, and a pin 431h having a substantially elliptical cross-sectional shape is protruded in the vertical direction from the extending end. In the example shown in the figure, a pair of pins 431h projecting in a direction close to each other from the upper and lower extending ends are provided. Similarly, the second connecting member 432 is also provided with a pin 432h.

  Thus, by attaching the coupling ring 435 so that the pin 431h of the first coupling member 431 and the pin 432h of the second coupling member 432 are inserted together, the first coupling member 431 and the second coupling member 431 are mounted. The member 432 is coupled so as to be relatively rotatable. That is, both pins 431 h and 432 h slide with respect to the inner periphery of the coupling ring 435 with the coupling ring 435 attached.

  When the coupling ring 435 is attached to the connecting members 431 and 432, the other end side of the first connecting member 431 and the other end side of the second connecting member 432 are adjacent to each other, and the tips of the pins 431h and 432h formed vertically The coupling ring 435 is inserted therebetween, and then the coupling ring 435 is moved upward or downward along the pins 431h and 432h, thereby inserting the pins 431h and 432h of the coupling members 431 and 432 into the coupling ring 435. . In the present embodiment, the coupling ring 435 is attached to each of the upper pins 431h and 432h and the lower pins 431h and 432h. Further, by inserting separate coupling rings 435 between the upper and lower coupling rings 435 engaged with the pins 431h and 432h, the upper and lower coupling rings 435 are prevented from being detached from the pins 431h and 432h. As a result, both connecting members 431 and 432 are coupled.

  In this embodiment, the coupling ring 435 plays a role as a coupling member. Unlike the third embodiment, the coupling ring 435 which is a coupling member can be inserted into and removed from both the coupling members 431 and 432. Therefore, the first connecting member 431 and the second connecting member 432 can be separated.

  Other specific aspects of each part can be configured in the same manner as in the third embodiment, and the description thereof is omitted here.

  Note that the present invention is not limited to the embodiment described in detail above, and various modifications can be made without departing from the spirit of the present invention.

The perspective view which shows the concrete block used as the application object of this invention. The plane sectional view showing the connecting device in one embodiment of the present invention. The front view. The same side view. The plane part which shows the bevel surface of the concrete block in the embodiment. The plane sectional view showing the connecting device in one embodiment of the present invention. AA line sectional view in FIG. The plane part which shows the bevel surface of the concrete block in the embodiment. The plane sectional view showing the connecting device (at the entrance corner side of a pipe line) in one embodiment of the present invention. The plane sectional view showing the connecting device (on the exit corner side of a pipe line) in the embodiment. The perspective view which shows the coupling tool in the embodiment. The perspective view which shows the coupling tool and spacer in the embodiment. The principal part side view which shows the coupling device in one Embodiment of this invention. Side view of the main part The principal part side view.

Explanation of symbols

1. Concrete block (box culvert)
2 ... Tensile material (PC steel bar)
DESCRIPTION OF SYMBOLS 3 ... Connecting apparatus 4 ... Connecting tool 411, 421, 431 ... 1st connecting member 412, 422, 432 ... 2nd connecting member 5 ... Retaining tool

Claims (19)

It is used to connect concrete blocks inserted or embedded with tendons,
A first connecting member and a second connecting member which are capable of relative rotation, wherein the first connecting member is attached to a tension member of one concrete block, and the second connecting member is used as a tension member of the other concrete block; A connector for attaching and connecting both tendons;
A coupling device comprising: a retainer that prevents the coupling tool from expanding so as to widen an angle formed by the first coupling member and the second coupling member. The connecting device according to claim 1, wherein the connecting device can be disassembled into the first connecting member, the second connecting member, and a connecting member that couples the connecting members so as to be relatively rotatable. The retainer anchors a coupling member that couples the first coupling member and the second coupling member so as to be capable of relative rotation to the concrete block to prevent the coupling member from being displaced toward the corner. The coupling device according to claim 1 or 2. The coupling device according to claim 3, wherein the retainer is rotatable about an axis of the coupling member. The retainer is provided with a female screw, and the coupling member is provided with a male screw that is screwed into the female screw,
The connecting device according to claim 3, wherein the retainer is fixed to the concrete block, and then the coupling member is screwed to the retainer. Forming a groove extending substantially parallel to an extension direction of the tendon in the first connecting member or the second connecting member;
The connecting member is locked to the first connecting member or the second connecting member in a state where the holding member is inserted into the groove, and the connecting member is fixed to the concrete block so that the connecting member is located on the corner side. The coupling device according to claim 1, wherein the displacement is suppressed. The said retainer is interposed between the said concrete block and said 1st connection member or said 2nd connection member, and it suppresses that this connection member displaces to an entrance corner side. Connecting device. The retainer includes a female screw member and a male screw member screwed into the female screw member.
The connection device according to claim 1, wherein one of the female screw member and the male screw member is fixed to the concrete block, and the other is attached to the connector. At least a part of the retainer is disposed between both concrete blocks to be connected, and the retainer is connected to the concrete block by tensioning the tension material connected via the connector and pressing the joint surfaces of the concrete blocks together. The coupling device according to claim 1, 2, 3, 4 or 5. A groove extending in a direction substantially perpendicular to the direction of extension of the tendon is formed in the connecting member, and the tendon is inserted into the groove and locked. The coupling device as described. A connecting device according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10,
The first connecting member attached to the tension member of one concrete block and the second connecting member attached to the tension member of the other concrete block are coupled so as to be capable of relative rotation, and the two tension members are connected.
And the connection structure of the concrete block which arranged the retainer which suppresses that the said connection tool expands so that the angle which said 1st connection member and said 2nd connection member make may be expanded. The first coupling member and the second coupling member are coupled via a coupling member,
The connecting structure for a concrete block according to claim 11, wherein the connecting member is moored to the concrete block by the retainer to prevent the connecting member from being displaced toward the corner. Forming a groove extending substantially parallel to an extension direction of the tendon in the first connecting member or the second connecting member;
The connecting member is locked to the first connecting member or the second connecting member in a state where the holding member is inserted into the groove, and the connecting member is fixed to the concrete block so that the connecting member is located on the corner side. The concrete block connection structure according to claim 11, wherein the displacement is suppressed. The concrete block according to claim 11, wherein a retainer is interposed between the concrete block and the first connecting member or the second connecting member to prevent the connecting member from being displaced toward the corner. Connection structure. It can be used for the connecting structure of concrete blocks according to claim 11 or 12,
Burying tendons for connection,
Forming a recess for placing the first connecting member or the second connecting member, which is an element of a connecting tool for connecting the tendons together, at the portion corresponding to the end of the tendon,
And the concrete block which has formed the ditch | groove connected to the said recess in the opening end surface joined at the time of a connection. It can be used for the connecting structure of concrete blocks according to claim 11 or 12,
Burying tendons for connection,
Forming a recess for disposing the first connecting member or the second connecting member that is coupled so as to be relatively rotatable at a portion corresponding to the end of the tendon;
And the concrete block which has formed the ditch | groove which can hold | maintain the retainer which suppresses that the said 1st connection member and said 2nd connection member expand on the opening end surface joined at the time of connection. It can be used for the connecting structure of concrete blocks according to claim 11 or 12,
Burying tendons for connection,
Forming a recess for disposing a first connecting member or a second connecting member, which is connected to the end of the tendon so as to be relatively rotatable via a connecting member;
And the concrete block which has formed the ditch | groove which can hold | maintain the retainer which screwes together with the said coupling member and anchors this coupling member in the opening end surface joined at the time of a connection. It can be used for the concrete block connection structure according to claim 11 or 13,
Burying tendons for connection,
Forming a recess for placing the first connecting member or the second connecting member, which is an element of a connecting tool for connecting the tendons together, at the portion corresponding to the end of the tendon,
And the concrete block which has embed | buried the internal thread member or the external thread member in the predetermined position which faces the said recess. It can be used for the concrete block connection structure according to claim 11 or 13,
Burying tendons for connection,
In a portion corresponding to the end portion of the tendon, a recess is provided to dispose one of the first connecting member and the second connecting member that are coupled so as to be relatively rotatable.
And a restraining device that prevents the first connecting member and the second connecting member from spreading out by combining a female screw member and a male screw member screwed into the female screw member at a predetermined position facing the recess. A concrete block in which a female screw member or a male screw member is embedded.

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