JP5787965B2 - Fittings for bridge decks - Google Patents

Description

  The present invention relates to a joint for a bridge floor slab that connects concrete precast slabs for bridges adjacent to each other in the bridge axis direction of the bridge.

  Concrete precast floor slabs for bridges used on bridges that run over rivers, valleys, etc. and pass through roads, etc. are bridged over multiple main girders arranged side by side in the bridge width direction and adjacent to the bridge axis direction. Multiple matching concrete precast slabs for bridges are connected to each other.

  Conventionally, when connecting concrete precast slabs for bridges adjacent to each other in the bridge axis direction, the concrete precast for bridges is formed in the joint space formed by abutting the connecting ends of the concrete precast slabs for bridges. In the loop, the ends of the upper and lower bars arranged in the floor slab are extended to form a plurality of loop reinforcing bars formed in an arc shape in the joint space, and the loop reinforcing bars extend in the bridge width direction. It is known that reinforcing reinforcing bars are fastened, and further, interstitial concrete is placed in the joint space (see, for example, Patent Document 1).

Unexamined-Japanese-Patent No. 2010-236258.

  However, when connecting concrete precast slabs for bridges as described above, reinforcing reinforcing bars in the loop are fastened to the loop joints that are provided in the bridge width direction at the construction site, and the interstitial concrete is placed in the joint space. There is a problem in that it is necessary to place and the connecting work of the concrete precast slab for bridges at the construction site is complicated.

  In addition, when it is necessary to periodically replace concrete precast slabs for bridges due to deterioration over time due to vehicle traffic, etc., when connecting concrete precast slabs for bridges to each other, the joint space must be cut vertically. Therefore, it is necessary to cut all the arcs of the loop joint protruding from the side edge of the concrete precast slab for bridges in the width direction of the bridge, which requires much time and personnel to separate the concrete precast slab for bridges. There was a problem that it took.

  Furthermore, the joint part of the concrete precast slab for bridges as described above is fastened so that the adjacent concrete precast slabs for bridges are not relatively displaced by fastening the reinforcing bars in the loop to the loop joints. Therefore, the concrete precast slab for bridges, whose back side is partially supported in the bridge width direction by the main girder, is bent due to load compared to road slabs laid on the ground. There has been a problem that bending tends to occur and durability and water stoppage of the connecting portion of the concrete precast slab for bridges may be lowered.

  Therefore, technical issues to be solved in order to easily realize the connection work and separation work of the concrete precast slab for bridges and to improve the durability against the load and water stoppage at the connection part of the concrete precast slab for bridges The present invention aims to solve this problem.

The present invention is proposed in order to achieve the above object, and the invention according to claim 1 is a joint member for a bridge floor slab that connects concrete precast slabs for bridges adjacent to each other in the bridge axis direction. The concrete precast slab is attached to a side end portion in the bridge axis direction of the concrete precast slab and has a fitting recessed portion having an opening portion on a distal end side, and extends to a proximal end side of the fitting recessed portion. C-type joint fittings having anchors embedded therein, and two fittings respectively fitted in respective fitted recesses of the two C-type joint fittings attached to and opposed to the adjacent concrete precast slabs An H-shaped joint fitting having a fitting part, an intermediate connecting part having both ends connected to the two fitting parts and capable of cutting the center with a concrete cutter, and the fitting part in the fitting recessed part Fitting In state, the fixing means and, in which bridge deck fittings fitting comprising a fixed to the vertical direction said engaging portion with respect to the object fitting recess, wherein the intermediate connection part comprises, from both ends of the center Provided is a fitting for a bridge floor slab formed with a reduced width .

  According to this configuration, the concrete precast floor for a bridge in which the fitting portion of the H-shaped fitting is fitted in the fitting recessed portion of the C-shaped fitting and the intermediate coupling portion of the H-shaped fitting is adjacent in the bridge axis direction. With the fixing means positioned and fixed in the vertical direction in the recessed portion to be fitted in a state where it is provided so as to straddle the plate, the adjacent concrete precast floor slabs for bridges can be easily connected to each other, and the ground Even if it is a bridge floor slab that tends to bend or bend due to a load compared to a road slab laid on the road, it will improve the durability and water stoppage at the connecting part of the concrete precast floor slab for bridge be able to.

  In addition, it is possible to easily separate the concrete precast slabs for bridges by simply cutting the intermediate joints between adjacent concrete precast slabs for bridges, so that the concrete precast slabs for bridges can be separated from each other. Can do.

Furthermore, since the middle connecting part is formed with a reduced width near the center compared to both ends connected to the fitting part, it is easy to cut near the center of the central connecting part. Separation work can be performed promptly, and both ends of the central coupling part are formed wider than near the center, thereby reducing stress concentration at the connecting part between the fitting part and the central coupling part. Therefore, it is possible to improve durability and water stoppage at the connecting portion of the concrete precast slab for bridges.

The invention of claim 2, wherein, in addition to the configuration of the invention according to claim 1 Symbol mounting, the fixing means, the mating portion through the vertically formed through the bolt insertion holes, wherein the fitted Provided is a bridge slab joint fitting including a bolt screwed to a bottom surface of a recess.

  According to this configuration, since the bolt fastens the fitting portion in the fitting recessed portion and fixes it in the vertical direction, the adjacent concrete precast slabs for bridges are simply connected to each other, and the fitting portion is fitted. In order to suppress displacement in the joint recess, it is possible to improve durability and water stoppage at the connection portion of the concrete precast slab for bridges over a long period of time.

According to a third aspect of the present invention, in addition to the configuration of the first or second aspect of the invention, the C-shaped fitting is provided with an insertion guide portion formed on the inner surface at the front end side of the fitted recess, The mold joint bracket provides a bridge floor slab joint bracket including a guided portion formed in the fitting portion so as to face the insertion guide portion.

  According to this configuration, when the fitting portion of the H-type fitting is fitted into the fitting recess of the C-type fitting, the guided portion is guided to the insertion guide portion, and the fitting portion is fitted. Positioning at a desired position within the joint recess reduces the positioning work when assembling the H-shaped joint bracket to the C-shaped joint bracket, easily connects adjacent concrete precast slabs for bridges, and allows bending. Even if the tensile stress acts on the H-shaped joint metal fitting, the insertion guide part receives the tensile stress acting on the H-shaped joint metal fitting while supporting the guided part. Durability and water stoppage at the connecting portion can be improved.

According to a fourth aspect of the invention, in addition to the configuration of the third aspect of the invention, the insertion guide portion and the guided portion are formed in a tapered shape that is inclined toward the base end side toward the lower side in the vertical direction. Provided fittings for bridge decks.

  According to this configuration, the guided portion of the fitting portion is reliably inserted into a desired position while being guided by the insertion guide portion, thereby improving durability and water stoppage at the connection portion of the concrete precast slab for bridges. Can be made.

According to a fifth aspect of the present invention, in addition to the configuration of the third aspect , the insertion guide portion and the guided portion provide a bridge floor slab fitting that extends along the vertical direction. To do.

  According to this configuration, the guided portion of the fitting portion is reliably inserted into a desired position while being guided by the insertion guide portion, thereby improving durability and water stoppage at the connection portion of the concrete precast slab for bridges. Can be made.

Invention according to claim 6, in addition to the configuration of the invention according to any one of claims 3 to 5, wherein the insertion guide portion, respectively on both sides of the opening portion in the width direction of the C-shaped joint fitting s Provided are the bridge floor slab joint brackets that are provided on both sides of the H-shaped joint bracket in the width direction of the intermediate coupling portion.

  According to this configuration, even when bending occurs and tensile stress acts on the H-shaped joint fitting, the insertion guide portions provided on both sides in the width direction support the guided portion and the H-shaped joint. In order to receive the tensile stress acting on the metal fittings evenly in the width direction, the H-type joint metal fittings are prevented from receiving an unbalanced load, and the durability and water stoppage at the connecting part of the concrete precast slab for bridges are maintained over a long period of time. Can be improved.

Invention of claim 7, in addition to the configuration of the invention according to any one of claims 1 to 6, wherein the fixing means, the part key insertion hole formed in the inner wall surface of the fitting recess Provided is a joint for a bridge floor slab provided with a shear key that is inserted and attached to a protruding portion that protrudes from an inner wall surface of the fitted recess.

  According to this configuration, the fitting portion is fitted by inserting the shear key into the key insertion hole in a state where the fitting portion of the H-type fitting is fitted in the fitting concave portion of the C-type fitting. Because it is fixed in the vertical direction in the joint recess, positioning work when assembling the H-type fitting to the C-type fitting is reduced, and the adjacent concrete precast slabs for bridges can be easily connected to each other and the vehicle can be run. As a result, it is possible to prevent the fitting part from being displaced in the mating recess due to vibration of the floor slab due to, etc. Can be improved.

According to an eighth aspect of the invention, in addition to the configuration of the seventh aspect of the invention, the key insertion hole is disposed at the center in the width direction of the C-type joint fitting, and the shear key is provided with the H-type joint fitting. There is provided a bridge slab joint fitting which holds the fitting portion at the center in the width direction.

  According to this configuration, since the shear key suppresses the center of the fitting portion, the shear key suppresses the inclination of the fitting portion caused by the vibration of the floor slab caused by running of the vehicle or the like. Durability and water stoppage at the connecting portion of the floor slab can be improved over a long period of time.

According to a ninth aspect of the present invention, in addition to the configuration of the seventh or eighth aspect of the invention, the shear key is a bridge floor that is formed in a wedge shape that is gradually thinner toward the insertion direction of the shear key. Providing plate fittings.

  According to this configuration, since the shear key firmly engaged in the key insertion hole fixes the fitting portion in the vertical direction in the fitting recessed portion, it is caused by vibration of the floor slab caused by running of the vehicle or the like. It is possible to suppress the displacement of the fitting portion in the fitting recessed portion, and to improve the bending durability and water stoppage at the connecting portion of the concrete precast slab for bridges over a long period of time.

The invention of claim 10, wherein, in addition to the configuration of the invention according to any one of claims 1 to 9, wherein C-type joint fitting is extended in the width direction on the outer peripheral wall surface of the object fitting recess Provided is a fitting for a bridge floor slab having a retaining ridge.

  According to this configuration, even if a shearing force acts on the connecting portion of the concrete precast floor slab for bridges by embedding the retaining protrusions in the concrete precast floor slab for bridges, the C-type joint The metal fitting can be prevented from falling off in the vertical direction.

According to an eleventh aspect of the invention, in addition to the configuration of the invention according to any one of the first to tenth aspects, the C-type joint fitting is provided with a retaining wing portion protruding in the width direction from the tip of the anchor. A joint fitting for a bridge deck is provided.

  According to this configuration, when the retaining wing portion is embedded in the concrete precast slab for bridges, the connecting part of the concrete precast slab for bridges receives a shearing force and the C-type joint bracket receives tensile stress. Even if it exists, it can control that a C type joint metal fitting falls out in the direction of a bridge axis.

The invention according to claim 12 is characterized in that, in addition to the configuration of the invention according to any one of claims 1 to 11 , the two C-type fittings provided at both ends in the bridge axis direction of the concrete precast slabs Provided is a bridge slab joint fitting in which the anchors facing each other are connected to each other.

  According to this configuration, each anchor of the C-type joint bracket disposed at one end of the concrete precast slab for bridges and the C-type joint bracket disposed at the other end is disposed in the concrete precast slab for bridges. In order to restrict the relative movement of the C-type fittings relative to each other in the bridge axis direction by being connected so as to cross each other, the connecting part of the concrete precast floor slab for bridges is subjected to bending and the C-type fitting Even when the metal fitting is subjected to tensile stress, it is possible to suppress the C-type joint metal fitting from dropping in the bridge axis direction.

A thirteenth aspect of the present invention is the bridge according to any one of the first to twelfth aspects, in which a grout material is filled between the C-type fitting and the H-type fitting. Providing floor bracket fittings.

  According to this configuration, the grout material is filled in the gap between the fitting recessed portion of the C-shaped fitting and the fitting portion of the H-shaped fitting, so that the fitting portion is in a desired position within the fitting recessed portion. Because it is fixed in a state where it is placed on the joint, it is possible to suppress the displacement of the fitting portion within the fitting recessed portion due to vibration of the floor slab caused by running of the vehicle, etc. It is possible to improve durability and water-stopping performance over a long period of time.

  In the joint fitting for bridge floor slab according to the present invention, the fitting portion of the H-type fitting is fitted in the fitting recess of the C-type fitting, and the intermediate connecting portion of the H-type fitting is adjacent to the bridge axis direction. In a state where it is provided so as to straddle the matching concrete precast slab for bridges, the fixing means positions and fixes the fitting portion in the vertical direction within the fitting recessed portion, so that the compression direction between the concrete precast slabs for bridge is reduced. Because prestress is introduced, adjacent concrete precast slabs for bridges are easily connected to each other, and bending and bending due to bending tend to occur compared to road slabs laid on the ground. Even if it is a floor slab, it is possible to improve the durability and water stoppage at the connecting portion of the concrete precast floor slab for bridges.

In addition , simply cutting the intermediate connection between the adjacent concrete precast slabs for bridges allows the concrete precast slabs for bridges to be easily separated, reducing the time required to replace the concrete precast slabs for bridges. be able to. Furthermore, since the middle connecting part is formed with a reduced width near the center compared to both ends connected to the fitting part, it is easy to cut near the center of the central connecting part. Separation work can be performed promptly, and both ends of the central coupling part are formed wider than near the center, thereby reducing stress concentration at the connecting part between the fitting part and the central coupling part. Therefore, it is possible to improve durability and water stoppage at the connecting portion of the concrete precast slab for bridges.

The top view which shows the bridge deck which applied the joint metal fitting for bridge decks which shows 1st Example of this invention. The top view of the bridge deck shown in FIG. The top view which shows the state which assembled | attached the H type coupling metal fitting to the C type coupling metal fitting. It is a figure which shows a C type coupling metal fitting, (a) is a top view, (b) is IVB sectional view, (c) is a front view. It is a figure which shows an H-type coupling metal fitting, (a) is a top view, (b) is a side view, (c) is a front view. FIG. 4 is a sectional view taken along line VI in FIG. 3. Explanatory drawing which shows the state which connected the anchor of the C-type coupling metal fitting via the coupler. It is a figure which shows the joint metal fitting for bridge floor slabs concerning 2nd Example of this invention, (a) is a top view, (b) is VIIIB sectional drawing. It is a figure which shows the joint metal fitting for bridge floor slabs concerning 3rd Example of this invention, (a) is a top view, (b) is IXB sectional drawing. It is a figure which shows the joint fitting for bridge floor slabs concerning 4th Example of this invention, (a) is a top view, (b) is XB sectional drawing.

In order to achieve the purpose of easily realizing the connection and disconnection of the concrete precast floor slab for bridges and suppressing the damage caused by the load at the connection part of the concrete precast floor slab for bridges, the present invention Fittings for bridge floor slabs that connect concrete precast slabs for bridges adjacent to each other, and are fitted to the side ends of the concrete precast slabs in the direction of the bridge axis, and have an opening at the tip side A C-type joint fitting having a recess and an anchor that is extended to the base end side of the recessed portion to be fitted and embedded in the concrete precast floor slab, and two Cs that are attached to and confront each other adjacent concrete precast floor slab Two fitting portions that are respectively fitted to the respective fitting recesses of the mold fitting, and both ends are connected to the two fitting portions and the center is connected to the concrete bracket. H-type fittings having an intermediate connecting part that can be cut with a screw, and fixing for fixing the fitting part in a vertical direction with respect to the fitting recessed part with the fitting part fitted in the fitting recessed part And the intermediate connecting portion is formed by reducing the width from both ends toward the center .

  A bridge floor slab fitting 10 according to a first embodiment of the present invention will be described below with reference to the drawings.

  A concrete precast slab for bridge (hereinafter referred to as “PCa floor slab for bridge”) 1 in which the joint metal fitting 10 for a bridge floor slab is used is arranged in parallel in the bridge width direction W as shown in FIGS. 1 and 2. It is placed and fixed on the main girder 2 of the book.

  A large number of bridge PCa floor slabs 1 are connected in the bridge axis direction L via bridge floor slab fittings 10, and a road is formed by filling the joint between the PCa floor slabs 1 and 1 with a grout material. To do. The various dimensions of the bridge PCa floor slab 1 are, for example, a length in the bridge axis direction L of 2.5 m, a width in the bridge width direction W of 11.9 m, and a plate thickness in the vertical direction H of 0.23 m. .

  The bridge floor joint metal fitting 10 is a cotter joint, and as shown in FIG. 3, a C-type joint metal 20 attached to the side end portion 1a in the bridge axial direction L of the bridge PCa floor slab 1, and a bridge PCa. An H-type joint bracket 30 connecting two C-type joint brackets 20 and 20 attached to the floor slabs 1 and 1 and facing each other, and the H-type joint bracket 30 with respect to the C-type joint bracket 20 in the direction perpendicular to the plane of FIG. And fixing means 40 for fixing to the head.

  As shown in FIG. 4, the C-shaped joint fitting 20 includes a fitting concave portion 21 having a D-shape in a plan view having an opening portion 20 a on the distal end side, and a bridge axis direction L on the base end side of the fitting concave portion 21. Two anchors 22 are provided that extend along the longitudinal direction L1 of the matching C-shaped joint fitting 20 and are embedded in the bridge PCa floor slab 1.

  The fitted recess 21 of the C-shaped fitting 20 has a proximal side toward the lower side in the vertical direction H1 of the C-shaped fitting 20 that matches the vertical direction H of the inner surface 21a of the fitted recess 21. 4 is provided with an insertion guide portion 23 formed in a tapered shape inclined upward in the drawing. The insertion guide portions 23 are provided on both sides of the opening portion 20a in the width direction W1 of the C-shaped joint fitting 20 that coincides with the bridge width direction W, respectively.

  A key insertion hole 24 into which a shear key 42 described later is inserted is formed in the inner wall surface 21 b of the fitted recess 21. The key insertion hole 24 is disposed in the center of the C-shaped joint fitting 20 in the width direction W1.

As shown in FIG. 5, the H-type fitting 30 is formed in a D-shape in a plan view and is fitted into the fitting recesses 31 of the C-type fitting 20, and these fittings. The intermediate connection part 32 which is connected to the parts 31 and 31 at both ends and extends in the longitudinal direction L2 of the H-shaped joint fitting 30 that coincides with the bridge axis direction L is provided.
The intermediate connecting portion 32 receives a bending moment caused by a downward shearing force in the vertical direction H2 of the H-shaped joint fitting 30 that coincides with the vertical direction H generated when the vehicle travels on the bridge PCa floor slab 1.

The intermediate connecting part 32 is formed so as to close the opening 20a of the C-shaped joint fitting 20, and the intermediate connecting part 32 is formed with a reduced width from both ends toward the center.
Thereby, the center vicinity of the center connection part 32 is easy to cut | disconnect with a concrete cutter, the cutting work of the PCa floor slab 1 for bridges can be performed rapidly, and both ends of the center connection part 32 are compared with center vicinity. Due to the widening, the stress concentration at the connecting portion between the fitting portion 31 and the central coupling portion 32 is reduced.

The fitting portion 31 faces the insertion guide portion 23, is provided so as to be engageable with the insertion guide portion 23, and is formed in a tapered shape that inclines to both sides in the longitudinal direction L2 downward in the vertical direction H. A guided portion 33 is provided.
Thereby, when the fitting part 31 is fitted in the fitting recessed part 21, the guided part 33 is guided by the insertion guide part 23, and the fitting part 31 is located in a desired position in the fitting recessed part 21. Is positioned. Further, since the insertion guide portion 23 and the guided portion 33 are formed in a tapered shape, as the fitting portion 31 is fitted into the fitted concave portion 21, the adjacent PCa floor slabs 1 for bridges, In the meantime, prestress in the compression direction is gradually introduced.
The insertion guide part 23 and the guided part 33 may extend along the vertical direction H.

The guided portions 33 are respectively provided on both sides of the intermediate connecting portion 32 in the width direction W2 of the H-shaped joint fitting 30 that coincides with the bridge width direction W.
Thus, when a shearing force is applied to the connecting portion C of the PCa floor slab 1 for bridges, the insertion guide portions 23 provided on both sides in the width direction W2 support the guided portion 33 and the H-shaped joint bracket. Since the tensile stress acting on 30 is evenly received in the width direction, it is possible to avoid an uneven load from acting on the H-shaped joint fitting 30.

As shown in FIG. 6, the fixing means 40 includes a bolt 41 screwed to the bottom surface 21 c of the fitting recess 21 through a bolt insertion hole 31 a formed through the fitting portion 31 in the vertical direction H. ing. The fixing means 40 includes a shear key 42 that is partially inserted into the key insertion hole 24 and holds the fitting portion 31 with a protruding portion 42 a that protrudes from the inner wall surface 21 b of the fitting recessed portion 21. .
Thereby, the bolt 41 and the shear key 42 fix the fitting part 31 in the vertical direction H within the fitting recessed part 21, and connect the adjacent PCa floor slabs 1 and 1 for bridges. Further, even when the fastening force of the bolt 41 is reduced due to vibrations caused by running of the vehicle, the shear key 42 is positioned so that the fitting portion 31 moves relative to the fitting recess 21. Suppresses deviation.
The fixing means 40 only needs to be able to fix the H-shaped joint fitting 30 to the C-type joint fitting 20, and even if the bolt 41 and the shear key 42 are provided, Only one of them may be provided.

As shown in FIGS. 3 and 6, the shear key 42 is configured to press the upper surface of the fitting portion 31 at the center in the bridge width direction W while being inserted into the key insertion hole 24. Further, the shear key 42 is formed in a wedge shape with a thickness that is gradually reduced toward the insertion direction of the shear key 42, that is, both the left and right sides of the paper surface of FIG. 6.
As a result, the fitting part 31 is prevented from being centered by the shear key 42, and the fitting part 31 is prevented from being inclined in the fitting recessed part 21. Further, since the shear key 42 is suppressed from falling off the key insertion hole 24 and the fitting portion 31 is securely fixed in the vertical direction H within the fitting recessed portion 21, the fitting portion 31 is fitted. The positional deviation in the recess 21 is suppressed.

A grout material (not shown) is filled between the fitting recessed portion 21 of the C-type joint fitting 20 and the fitting portion 31 of the H-type joint fitting 30.
Thereby, the fitting part 31 is fixed in a state where the fitting part 31 is arranged at a desired position in the fitting recessed part 21, and the fitting part 31 is suppressed from being displaced in the fitting recessed part 21.

As shown in FIG. 7, the two C-type fittings 20, 20 provided at both ends in the bridge axis direction L of the bridge PCa floor slab 1 are composed of two couplers 50, 50 each having two anchors 22, 22 facing each other. Are connected via an intermediate member 51. One end 50a of the coupler 50 is screwed into a threaded portion formed at the tip of the anchor 22, and the other end 50b of the coupler 50 is inserted into the end 51a of the intermediate member 51, whereby the bridge PCa floor slab 1 is inserted. The anchors 22 of the C-type joint fittings 20 arranged on both sides in the bridge axis direction L are connected. The coupler 50 may directly connect the anchors 22 and 22 without interposing the intermediate member 51.
As a result, the C-type joint fittings 20 and 20 are restricted from moving relative to each other in the bridge axis direction L, so that the connecting portion C of the bridge PCa floor slab 1 receives a shearing force and receives the C-type joint fittings. Even when 20 is subjected to tensile stress, the C-shaped joint fitting 20 can be prevented from dropping in the bridge axis direction L.

  Next, a bridge floor slab fitting according to a second embodiment of the present invention will be described with reference to FIG. Here, the bridge floor slab joint bracket of the first embodiment described above and the bridge floor slab joint bracket of the present embodiment differ only in the specific configuration of the C-type joint bracket. A duplicate description is omitted.

The C-type joint fitting 20 of the bridge floor joint fitting 10 in this embodiment includes a retaining protrusion 25 extending over the bridge width direction W on the outer peripheral wall surface 21d of the recessed portion 21 to be fitted. ing.
As a result, even if a shearing force acts on the connecting portion C of the PCa floor slab 1 for bridges, the retaining protrusion ridge portion 25 engages with the PCa floor slab 1 for bridges. Dropping in the vertical direction H can be suppressed.

  Next, a bridge floor slab fitting according to a third embodiment of the present invention will be described with reference to FIG. Here, the bridge floor slab joint bracket of the first embodiment described above and the bridge floor slab joint bracket of the present embodiment differ only in the specific configuration of the C-type joint bracket. A duplicate description is omitted.

The C-type joint bracket 20 of the bridge floor slab joint bracket 10 according to the present embodiment includes a retaining wing portion 26 protruding from the tip of the anchor 22 in the width direction W and the vertical direction H.
As a result, even if the connecting portion C of the bridge PCa floor slab 1 receives a shearing force and the C-type joint fitting 20 receives a tensile stress, the retaining wing 26 is engaged with the bridge PCa floor slab 1. Therefore, the C-shaped joint fitting 20 can be prevented from falling off in the bridge axis direction L.

  Next, a bridge floor slab fitting according to a fourth embodiment of the present invention will be described with reference to FIG. Here, the bridge floor slab joint bracket of the third embodiment and the bridge floor slab joint bracket of the present embodiment differ only in the specific configuration of the fixing means, and the same members are duplicated. Description is omitted.

The bridge floor slab fitting 10 in this embodiment fixes the C-type fitting 20 and the H-type fitting 30 via a shear key 42.
Thereby, the H-type joint fitting 30 can be easily attached to the C-type joint fitting 20 without fastening the H-type joint fitting 30 to the C-type joint fitting 20 with bolts.

  In this way, the bridge floor slab fitting 10 according to the present invention described above is formed in such a manner that the fitting portion 31 of the H-type fitting fitting 30 is fitted into the fitted recess 21 of the C-type fitting fitting 20. In a state where the intermediate connecting portion 32 of the joint metal fitting 30 is provided so as to straddle the PCa floor slabs 1 and 1 adjacent to each other in the bridge axis direction L, the bolt 41 and the shearing key 42 push the fitting portion 31 into the recessed portion to be fitted. Since the prestress in the compression direction is introduced between the PCa floor slabs 1 and 1 for bridges by positioning and fixing in the vertical direction H within 21, the adjacent PCa floor slabs 1 and 1 for adjacent bridges are simply connected. In addition, even if the bridge PCa floor slab 1 is likely to bend or bend due to shearing force as compared with the road floor slab laid on the ground, the durability of the connecting portion C of the bridge PCa floor slab 1 Property and water stoppage can be improved.

  Furthermore, the bridge PCa floor slab 1 can be simply separated by simply cutting the intermediate connecting portion 32 that straddles between the adjacent bridge PCa floor slabs 1, so that the time required for replacing the bridge PCa floor slab 1 is sufficient. Can be shortened.

  The present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

1 ... Concrete precast slab for bridge (PCa slab for bridge)
DESCRIPTION OF SYMBOLS 1a ... Side edge part 10 ... Joint metal fitting 20 for bridge floor slabs ... C-type joint metal fitting 20a ... Opening part 21 ... Mated recessed part 22 ... Anchor 23 ... Insertion guide Portion 24 ··· Key insertion hole 25 ··· Retaining protrusion 26 · · · Retaining blade portion 30 · · · H-shaped fitting 31 · Fitting portion 31a · · · Bolt insertion hole 32 ··· · Intermediate connecting portion 33 ··· Guided portion 40 ··· Fixing means 41 ··· Bolt 42 ··· Shear key 42a ··· Projecting portion L · · · Bridge axis direction W · · · Bridge width direction H · ·· Vertical direction

Claims (13)

It is a joint fitting for a bridge floor slab that connects concrete precast floor slabs for bridges adjacent to each other in the bridge axis direction,
The concrete precast floor slab is attached to a side end portion in the bridge axis direction, and has a fitted recess having an opening portion on a distal end side, and is extended to a proximal end side of the fitted recess, and is in the concrete precast floor slab A C-type joint fitting having an anchor embedded in
Two fitting parts that are respectively fitted to the fitting recessed parts of the two C-type fittings that are attached to and face each other to the adjacent concrete precast slabs, and both ends are connected to the two fitting parts And an H-shaped joint bracket having an intermediate connecting portion that can be cut with a concrete cutter at the center,
A fixing means for fixing the fitting portion in a direction perpendicular to the fitting recessed portion in a state where the fitting portion is fitted in the fitting recessed portion,
In bridges deck for joint fittings that have a,
The intermediate coupling part is formed with a reduced width from both ends toward the center . The fixing means according to claim 1, characterized in that said through a fitting portion bolt insertion holes formed through the vertical direction, and includes the screwed on the bottom surface of the fitting recess bolt serial placement of the bridge deck for joint fittings. The C-type fitting is provided with an insertion guide portion formed on the inner surface at the front end side of the mating recess,
The H-shaped joint fitting, according to claim 1 or 2 bridge deck for joint fittings according to, characterized in that facing the insertion guide portion and a guided portion formed in the fitting portion. The bridge fitting for a bridge floor slab according to claim 3, wherein the insertion guide portion and the guided portion are formed in a tapered shape that inclines toward the base end toward the lower side in the vertical direction. The bridge fitting for bridge deck according to claim 3, wherein the insertion guide portion and the guided portion are extended along the vertical direction. The insertion guide portions are respectively provided on both sides of the opening portion in the width direction of the C-shaped joint fitting,
The bridge floor slab joint according to any one of claims 3 to 5 , wherein the guided portions are respectively provided on both sides of the intermediate connecting portion in the width direction of the H-shaped joint fitting. Hardware. The fixing means is partially inserted into a key insertion hole formed in the inner wall surface of the fitting recess, and holds the fitting portion at a protruding portion protruding from the inner wall surface of the fitting recess. The joint fitting for bridge floor slab according to any one of claims 1 to 6 , further comprising a shear key. The key insertion hole is disposed in the center in the width direction of the C-shaped fitting.
8. The joint fitting for a bridge floor slab according to claim 7 , wherein the shear key holds the fitting portion at the center in the width direction of the H-shaped joint fitting. 9. The joint fitting for a bridge floor slab according to claim 7 or 8 , wherein the shear key is formed in a wedge shape that is gradually thinner in the insertion direction of the shear key. The said C-type joint metal fitting is provided with the protrusion protrusion part extended in the width direction on the outer peripheral wall surface of the said to-be-fitted recessed part, The any one of Claim 1 thru | or 9 characterized by the above-mentioned. Joint fitting for bridge floor slab. The bridge fitting for a bridge floor slab according to any one of claims 1 to 10 , wherein the C-type fitting includes a retaining wing portion protruding in a width direction from a tip of the anchor. . Said two of said C-shaped joint fitting provided in the bridge axis direction ends of each concrete precast slab is any one of claims 1 to 11, characterized in that it is connected to the anchor facing each other to each other Fitting fitting for bridge floor slab as described. The joint fitting for bridge floor slabs according to any one of claims 1 to 12 , wherein a grout material is filled between the C-type joint fitting and the H-type joint fitting.

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