JP3754982B1 - PC cable automatic fixing connector - Google Patents

Abstract

The present invention provides an automatic fixing connector when replacing an aged PC cable or repairing or reinforcing a bridge girder by newly laying a PC cable.
A spring receiving portion for receiving a wedge 61,611 for fixing and fixing a PC cable 66,661 and a spring 64,641 to be pressed by a rear end face of the wedge and supporting the other end face of the spring. 63, 624, two outer cylinders 65, 651, and a cylindrical connecting portion 62 member that couples the two outer cylinders to both ends. The end of the PC cable 661 is connected to the inner cylinder 651. Then, the end portion of the PC cable 661 is guided along the guide surface 671 and pushed out of the connection member 62.
[Selection] Figure 4

Description

The present invention relates to an automatic fixing connector for a PC cable.

  Conventionally, in various bridges, a concrete bridge girder that directly supports the load of automobiles, railways, etc., is always subjected to a large bending moment between fulcrum, so T-girder, box girder, truss, hollow floor slab, plate girder It is possible to construct a bridge girder by laying a PC cable on a concrete frame such as an external cable and introducing prestress, and to increase the distance between fulcrums.

FIG. 1 is an explanatory view of a girder bridge using an automatic fixing connector according to an embodiment of the present invention and a connecting portion when the PC cable is replaced, (A) is a front sectional view, and (B) is an arrow A- FIGS. 1A and 1B are BB views, and FIG. 1 is also an explanatory diagram of a girder bridge using a conventional external cable system except for a tension / fixing connection portion at the center of the girder bridge. .

  A conventional outer cable girder bridge will be described with reference to FIG. Reference numeral 100 denotes an outer cable type girder, and a bridge girder 10 having a box cross-section composed of an upper surface, both side surfaces, and a lower surface having a protruding portion in the horizontal direction is coupled in the left-right (longitudinal) direction, and the cross beams 11, 111 at both ends. Is laid with the abutment 17 as a supporting point. 14 is an intermediate partition, and a communication hole 141 is provided at the center. An inspection hole 142 is provided on the lower surface of the bridge girder, and is used by an inspector to enter the bridge girder 10 at the time of inspection / inspection. Reference numerals 12 and 121 denote fixing plates provided at the left and right beam ends.

  One end of the PC cable is fixed and fixed to the fixing plate 12 at the left spar end using a fixing tool, for example, and the other end is inserted through the through-holes 143 of the two intermediate partition walls 14, and the chest wall 171 and embankment 172 at the right end are inserted. Before being stacked, it is tensioned by a hydraulic jack outside the cross beam 111 and fixed to the fixing plate 121 using a fixing tool. The PC cable is tensioned using the fixing plates 12 and 121 and the edge of the through hole 143 of the two intermediate partition walls 14 as support points.

In the following Patent Document 1, both ends of a concrete frame in which an upper flange (2) and a lower flange (3) are joined by a web (4) are supported by fulcrums (6) with a simple PC girder (1) of an external cable system. (FIGS. 6B and 6D). In addition, a simple PC bridge (15) of an external cable system constructed by integrating a plurality of main girders (13) through a fixing wall (16) serving as a transverse girder (FIG. 7). Further, a simple PC box girder (18) of an outer cable type is constructed in which an upper floor slab (19) and a lower floor slab (20) are connected by both side slabs (21) to form a hollow box girder inside. Various outer cable type girder bridges are shown, such as those in which the end of the girder (18) is supported by a fulcrum (6) (FIG. 9).
JP 2004-270178 A

  The above-mentioned PC cable may be replaced for repair after a considerable period of time due to aging, etc. However, when trying to connect the tension / fixing connection part of the PC cable at the end of the first girder, the road In addition, a large working space is required outside the girder ends of girder bridges used as railways, that is, on the abutment / chest wall and the back part thereof.

  However, there are many places where this work space is not provided at the time of bridge construction. In addition to lengthening the construction period and increasing the cost of bringing work equipment required for replacing the PC cable to the back of the abutment / chest wall and providing work holes for tension fixation, etc., the back of the abutment / chest wall Is a discontinuous structure with the chest wall, which has high strength and rigidity, and there is a problem that the settlement of the road surface becomes large and adversely affects the safety and riding comfort of the vehicle and train. In the various external cable girder bridges disclosed in Patent Document 1, the tension / fixing connection portion of the PC cable is performed at the end of the girder.

The present invention has been made in view of the above problems, and when replacing a PC cable and when laying a PC cable newly to repair and reinforce a bridge girder, it does not adversely affect the road surface of the road or railway. To provide an automatic fixing connector for PC cables where only the minimum required number of operator holes are provided on the back of the abutment / chest wall, and work such as bringing in work equipment and fixing tension are performed inside the beam end. It is in.

In order to achieve the above object, the present invention comprises two outer cylinders each having a wedge for fixing and fixing a PC cable, and a spring receiving portion for receiving a spring pressed at the rear end face of the wedge and supporting the other end face of the spring. An automatic fixing connector for a PC cable comprising a cylindrical connecting member for coupling the two outer cylinders to both ends, and a long hole is provided in the axial direction on the cylindrical outer surface of the connecting member. A guide surface that forms a substantially arc from the inner surface of one end of the connecting member to the open end of the elongated hole located at the other end of the connecting member, and one of the two outer cylinders is a PC cable. The other end of the two outer cylinders has a function of automatically fixing the end of the PC cable. When the end of the PC cable is pushed into the outer cylinder, the end of the PC cable is fixed. Part is guided along the guide surface, An automatic fixing connector, characterized in that extruded to the outside of the serial connection member.

The present invention includes two outer cylinders each having a wedge for fixing and fixing a PC cable and a spring receiving portion for supporting the other end surface of the spring, the spring being pressed by the rear end surface of the wedge, and the two outer cylinders. An automatic fixing connector for a PC cable comprising a cylindrical connecting member that joins a tube to both ends, and a long hole is provided in the axial direction on the cylindrical outer surface of the connecting member. A guide surface forming a substantially arc is provided from the inner surface of one end portion to the open end of the elongated hole located at the other end of the connecting member, and the end portion of the PC cable is automatically fixed on one of the two outer cylinders. The other end of the two outer cylinders has a function of automatically fixing the end of the PC cable. When the end of the PC cable at the other end is pushed into the outer cylinder, the PC cable at the other end The end of the guide is guided along the guide surface, and the contact Since it is an automatic fixing connector characterized by being pushed out of the member, it is easy to insert the PC cable into the fixing connector, and the work of cutting the PC cable every time the jack is replaced. Since it becomes unnecessary, the working efficiency is improved, and the effect is particularly great when the length of the PC cable is long and the elongation amount due to tension is large.

When replacing the PC cable, a large work space is required on the abutment / chest wall and the back of the abutment, but there are many places where this work space is not provided when the bridge is constructed, and there is a PC on the back of the abutment / chest wall. Providing new work holes that can be used for cable replacement, such as bringing in work equipment and fixing tension, increases the construction period and costs, and also increases the settlement of the road surface, making it safe for vehicles and trains to run Because of the problem of adversely affecting the performance and riding comfort, this embodiment fixes tension at the inside of the girder without providing the large work hole required when replacing the PC cable on the back of the abutment / chest wall. It is an auto-fixing connector that enables work .

In other words, the outer cable type girder according to the embodiment of the present invention uses a fixing tool for the fixing plate 12 having one end on the left side as described in the background art of the conventional outer cable type girder. The other end is inserted through the through hole 143 of the two intermediate partition walls 14 and fixed to the fixing plate 121 on the right side by using a fixing tool. the and makes it possible to be provided on the inside of the girder ends.

  At the back of the abutment / chest wall, the fixing tool is replaced, and the minimum number of work holes (not shown) for workers necessary for driving and fixing the wedges are provided.

  After removing the PC cable that needs to be replaced, the fixing plates 12 and 121 provided on the concrete at the end of the girder are in their original positions, and the ends of the left and right PC cables 15 and 16 are removed from the inside of the left and right girder ends. Are fixed to the fixing plates 12 and 121 using a fixing tool.

  The tension / fixing connection 13 of the left and right PC cables 15 and 16 is preferably horizontal in the center of the girder bridge and in the center of the bridge girder. It is better to select a part that can take up enough space. Further, a jack, a fixing connector or fixing plate, a wedge or the like may be used for the tension / fixing connection of the PC cable.

  However, the connection part of the PC cable is not limited to the central part of the girder bridge. What is necessary is just to be inside the beam end, and a place where a work space is easily secured may be appropriately selected depending on the structure of the bridge beam. The structure of the bridge girder is not limited to a box type. When the PC cable is routed under the bridge girder, a simple gondola is suspended from the bridge girder under the bridge girder. May be.

As described above, if the automatic fixing connector according to the present embodiment is used , the replacement of the PC cable can be realized in a short construction period and at a low cost without providing a large working hole in the rear part of the abutment / chest wall. It is possible to obtain the effect that there is no adverse effect on the safety and riding comfort of automobiles and railways due to the sinking of the road surface at the back of the vehicle.

In addition, if the automatic fixing connector according to the present embodiment is used, it is a wedge fixing / connecting type, so even when the cable length is long and the amount of cable extension due to tension is large, the amount of tension is limited. Therefore, a predetermined tension can be applied by replacing the jacks, and the total tension can be easily increased by increasing the number of cables.

  Further, the present embodiment can be applied not only to the replacement of the PC cable, but also to repair and reinforcement of a girder bridge using the PC cable and a bridge girder not using the PC cable.

FIG. 2 is a front view of a single cable jack of a PC cable used when the automatic fixing connector according to the present embodiment of the present invention is used . 3 is a side view of FIG. 2, (A) shows an arrow AA diagram, (B) shows an arrow BB diagram, and (C) shows an arrow CC diagram.

2 or 3, the jack device 20 has a pair of cylinders 22, pistons 23, and rods 24 that are driven by a known hydraulic pump, and a pair of cylinders are fixed at a predetermined interval at the left end of the cylinders 22. A fixing plate 27 having a conical hole (with an opening groove on the lower side) for attaching the wedge 21 is provided. A pair of cylinders are attached to the right end of the cylinder 22 in parallel with the fixing plate 27 at a predetermined interval, and a cable is provided at the center. A fixing plate 271 with a U-shaped notch through which 66 is inserted is provided. Further, a fixing plate 272 having a conical hole (with an opening groove on the lower side) for fixing the wedge 211 is fixed to the right end of the pair of rods 24 in parallel with the fixing plate 27 and the fixing plate 271 at a predetermined interval. Is provided. Pipes 25 and 251 connected to a hydraulic pump (not shown) are provided at both ends of the cylinder 22 (FIGS. 2 and 3). The fixing plates 27 and 272 also have a function of a connection plate that fixes and holds the pair of cylinders 22 or the rods 24 at a predetermined interval. The conical holes of the fixing plates 27 and 272 are provided with an opening groove on the lower side, and when the wedge is slid, the PC cable can be attached and detached through the opening groove. The wedges 21 and 211 (the pressing spring and its pressing plate are omitted) have an automatic fixing function.

4A and 4B are explanatory diagrams of the automatic fixing connector according to the present embodiment, where FIG. 4A is a front view and FIG. 4B is a bottom view. In FIG. 4 , reference numeral 60 denotes a fixing connector, which includes a central connection member 62 and outer cylinders 65 and 651 at both ends. The connection member 62 has a cylindrical shape in which a steel pipe or a steel bar is processed and a hollow portion 621 is provided. A small-diameter portion 625 having a male screw on the outer periphery is provided at both ends, and an insertion hole 622 having a reduced inner diameter is provided at one end (right side in the figure) following the small-diameter portion 625. Is provided with an enlarged diameter portion 624 that functions as a spring receiving portion, which will be described later, and an elongated hole 623 is provided in the axial direction on the lower surface of the center portion (FIG. (B)).

  The inner surface of the end portion of the left outer cylinder 65 is provided with a female screw that is screwed with a male screw provided on the outer periphery of the end portion of the connecting member 62. Inside the wedge 61 divided into two to three parts, A spring 64 that presses the rear end face of the wedge 61 is accommodated, and a spring receiving member 63 that holds the other end of the spring 64 is fitted into the opening end of the connection member 62 in the left outer cylinder 65. A female screw that engages with a male screw provided on the outer periphery of the end of the connection member 62 is provided on the inner surface of the end of the right outer cylinder 651, and the wedge 611 and the rear end surface of the wedge 611 are pressed inside. A spring 641 is accommodated, and the above-described enlarged diameter portion 624 holds the other end of the spring 641. Both wedges 61 and 611 at both ends have an automatic fixing function.

  Reference numeral 67 denotes a steel or cast steel PC cable guide having a large arc surface 671 and an arc surface or a V-shaped surface for restricting the deviation of the PC cable in the direction perpendicular to the axis in a direction perpendicular to the large arc surface 671. A hook portion 672 is formed to hook the end portion of the hole 623 and prevent the displacement. Next, a working method and operation for tensioning and fixing using the fixing connector will be described. The jack is a single-drawing jack (FIG. 2) similar to that used in the description of the first embodiment.

Referring to FIG. 2, first, the fixing connector 60 is disposed between the two cylinders 22 of the jack with the left end abutting against the fixing plate 27, and the tip of the PC cable 66 is connected to the wedge of the fixing plate 27 from the left side. Inserting from the center of the conical hole, and further pushing the tip of the PC cable 66 into the outer cylinder 65 on the left side of the fixing connector 60 to fix the PC cable 66 to one end of the fixing connector 60 by the automatic fixing function of the wedge 61, and fixing The PC cable 66 is fixed to the fixing plate 27 by the automatic fixing function of the wedge 21 of the plate 27 (after the PC cable 66 is connected and fixed to the fixing connector 60, the PC cable is opened from the opening groove below the conical hole of the fixing plate 27. And then the wedge 21 may be attached and fixed).

Next, the tip of the PC cable 661 is inserted from the center of the conical hole of the fixing plate 272 on the right side, the tip passes through the U-shaped notch of the fixing plate 271, and is pushed into the outer cylinder 651 on the right side of the fixing connector 60. Nde, or the tip of the PC cable 661 is inserted until it visible from at least the long hole 623, or is inserted until no initial slack PC cables 66,661, the fixing fitting 60 by the automatic fixing function of the wedge 611 At the same time, it is fixed to the fixing plate 272 by the automatic fixing function of the wedge 211.

Subsequently, after confirming that the left end of the fixing connector 60 is in contact with the right end surface of the fixing plate 27 of the hydraulic jack, the hydraulic pump (not shown) is operated to contract the rod 24, and the PC cable 661 is connected. Pull the PC cable to the left and tighten the cable. The drawn PC cable 661 is sent out from the long hole 623 while being guided by the guide 67. If the tension amount of the PC cables 66 and 661 does not reach a predetermined value in the first pulling operation, the jacks are replaced and the second pulling operation is performed, and if necessary, the third pulling operation is performed. .

The direction of the guide by the guide 67 of the PC cable 661 is not limited to the downward direction shown in FIG. 4 , and may be appropriately left, right, or upward depending on the conditions around the work place. The guide can also be fixed.

When the predetermined amount of tension is reached, the hydraulic pressure of the jack is released, the wedges 21 and 211 attached to the fixing plates 27 and 272 are removed, the PC cables 66 and 661 and the jack device 20 that are fixedly connected are separated, and the long holes The PC cable 661 extruded from 623 is cut at an appropriate position within the hollow portion 621 of the connection member 62 to remove the cut portion 662, and the guide 67 is removed to connect the end of the PC cable 661 to the hollow portion of the connection member 62. In 621, the anticorrosion measures are applied to the PC cable of the hollow portion 621. Repeat the above operations to connect multiple PC cables. In this case, it is preferable that the fixing connection portion is shifted in the axial direction of the cable so that the fixing connection portions do not overlap at the same position, and an elastic protector is inserted in the interference portion between the PC cable and the fixing connection tool. When the automatic fixing connector according to the present embodiment is used, the right PC cable 661 can be easily inserted into the fixing connector 60, and the operation of cutting the PC cable is not required each time the jack is replaced. So work efficiency is improved. The effect is particularly great when the length of the PC cable is long and the elongation is large.

  In addition, the PC cable can be replaced without providing a large working hole in the back of the abutment / chest wall.

Next, a case where repair and reinforcement are performed on an aged girder bridge using the PC cable automatic fixing connector according to the present embodiment will be described .

FIG. 5 is an explanatory view of repairing / reinforcing a conventional aged girder bridge using the automatic fixing connector according to the embodiment of the present invention , where (A) is a front view and (B) is an arrow. View AA, (c) is an arrow BB view. This figure shows a conventional girder bridge provided with a fixing block 19, fixing plates 18, 181 and a PC cable through hole 144, and fixing plates 18 and 181 using fixing devices at the ends of the left and right PC cables 151 and 161, respectively. After fixing to, the tension girder connection part 13 is provided in the inner space of the intermediate partition wall to repair and reinforce the aged girder bridge, and the other girder bridges have the same configuration and need not be modified.

  Before tensioning the PC cable, first, a fixing block 19 and an intermediate partition wall 14 are provided with through holes 144 in the PC cable on the inner surfaces of the side walls of the left and right girders.

  Next, one end of each of the left and right PC cables is inserted into the fixing plates 18 and 181 of the block 19 from the inside of the bridge girder to the outside (left and right direction), and is fixed using a fixing tool (not shown). The other ends of the PC cables 151 and 161 are respectively inserted into the through holes 144 of the intermediate partition wall, and the tension is fixed by the tension / fixing connection portion 13 located at the middle part of the girder bridge and the bridge girder.

  The tension fixing work in the tension / fixing connection portion 13 can be performed by fixing the tension one by one with the single pulling jack according to the first embodiment.

  The tension / fixation connection part 13 is not limited to the center part of the girder bridge and the bridge girder as in the case of replacing the PC cable. What is necessary is just to select suitably with a structure. The structure of the bridge girder is not limited to a box type. When the PC cable is routed under the bridge girder, a simple gondola is suspended from the bridge girder under the bridge girder. May be.

  If the fixing block 19 and the intermediate partition wall PC cable through hole 144 are already provided, they may be used. In this case, it is not necessary to newly provide them.

  As described above, even when an old girder bridge is newly laid and repaired and reinforced, by installing a tension / fixing connection part in the middle part of the girder bridge, Without providing a large work hole, the construction period can be shortened and costs can be reduced, and the PC cable can be laid, and the safety of automobiles and railways due to the sinking of the road surface on the back of the abutment / chest wall, An adverse effect on the ride comfort can be prevented.

In addition, when using the automatic fixing connector according to the embodiment of the present invention, the description of providing the anticorrosion cover in the portion where the clothing of the cable is removed in the vicinity of the fixing connector or the fixing plate is omitted. The anticorrosion cover can be provided in the same manner as when the cable is attached.

It is explanatory drawing of the connection part at the time of the girder bridge using the tension | tensile_strength connection which concerns on embodiment of this invention, and its PC cable replacement | exchange, (i) is a front view, (b) is an arrow AA figure, (C) is an arrow BB diagram. This figure also serves as an illustration of the conventional external cable type girder bridge except for the tension / fixation part at the center of the girder bridge. It is a front view of the single drawing jack of PC cable used for construction at the time of using the automatic fixation connector concerning an embodiment of the invention. FIG. 3 is a side view of the fixing plate portion of FIG. 2, (A) is an arrow AA diagram, (B) is an arrow BB diagram, and (C) is an arrow CC diagram. It is explanatory drawing of the automatic fixing connector which concerns on embodiment of this invention, (A) is a front view, (B) is a bottom view. It is explanatory drawing in the case of repairing and reinforcing using the self-fixing connector according to the embodiment of the present invention for a conventional aged girder bridge , (A) is a front view, (B) is an arrow A- FIG. A and (C) are BB views.

Explanation of symbols

100, 200 ... Girder bridge (external cable type)
10, 101 ... Bridge girder 11, 111 ... Cross girder 12, 121 ... Fixing plate (girder end)
13 ... Tension / fixation connection part 14 ... Intermediate partition wall 141 ... Communication hole
142 ... Inspection hole 143, 144 ... Through hole 15, 16, 151, 161 ... PC cable 17 ... Abutment 171 ... Chest wall 172 ... Embankment 18, 181 ... Fixing plate 19 ... Block (for fixing)
20 ... Single pulling jack device 21, 211 ... Wedge 22 ... Cylinder 23 ... Piston 24 ... Rod
25, 251 ... piping 27, 272 ... fixing plate 271 ... fixing plate 60 ... fixing connector 61, 611 ... wedge 62 ... connection member 621 ... hollow portion 622 ... · Insertion hole 623 · · · Long hole 624 · · · Increased diameter portion 625 · · · Small diameter portion 63 · · · Spring receiving member 64 and 641 · · · Spring 65 and 651 · · · Outer tube 66, 661 · · · PC cable 662... Receiving member 64, 641... Spring 65, 651 .. outer cylinder 66, 661 .. PC cable 662.
67 ... guide 671 ... arc surface 672 ... hook part

Claims (1)

Two outer cylinders each having a wedge for fixing and fixing a PC cable and a spring receiving portion for supporting the other end surface of the spring which accommodates a spring pressed at the rear end surface of the wedge;
A PC cable auto-fixing connector comprising a cylindrical connecting member for coupling the two outer cylinders to both ends,
A long hole is provided in the axial direction on the cylindrical outer surface of the connection member, and a substantially circular arc is formed from the inner surface of one end of the connection member to the open end of the long hole located at the other end of the connection member. A guide surface that automatically fixes the end of the PC cable on one of the two outer cylinders, and has the function of automatically fixing the end of the PC cable on the other of the two outer cylinders, When the end of the other PC cable is pushed into the outer cylinder, the end of the other PC cable is guided along the guide surface and pushed out of the connecting member. Fixing connection.

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