JP2018168683A - Road bridge wheel guard widening unit - Google Patents

Abstract

To provide a road bridge wheel guard widening unit capable of elongating a widening length while suppressing the increase in deflection, weight, asphalt thickness, welding distortion, and cost.SOLUTION: The road bridge wheel guard widening unit is provided with: a pair of receiving frames 6 which is H-section steel arranged in parallel to one another and whose upper surface and lower surface are flanges; a faceplate 2 connected to an upper part of the rear end of the receiving frame; one or a plurality of load receiving angle(s) 8 for connecting the receiving frame; and a base plate 3 which has a base part having right and left wing parts connected to the receiving frame, and an arm part extended forward from the front end of the receiving frame.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a road bridge land cover widening unit that is installed to expand road width in a road bridge.

  Conventionally, the road bridge landscaping widening unit replaces the method of removing the ground cover at the edge of the floor slab and connecting the concrete ground cover to the outer part of the floor slab as an extension means for road width made of concrete floor slab. 2. Description of the Related Art A steel road bridge land cover widening unit made of steel is known that extends outwardly on the front surface side and is fixed to a ground cover removal portion at an end portion of a floor slab (see, for example, Patent Document 1). The widening by the conventional road bridge cover widening unit was 1000 mm, but in recent years, the demand from customers has become as long as about 1500 mm for widening on one side.

JP 2001-49618 A Japanese Patent Laid-Open No. 2005-220589

  However, when the widening by the conventional road bridge covering widening unit is extended to 1500 mm, there is a problem that the deflection becomes large. In addition, when widening only the sidewalk at the end of the road, if there is no pedestrian separation fence, it is assumed that the car parked in the sidewalk zone or the car that enters the sidewalk zone, and widening considering the wheel load Although it is necessary, there was a problem that it was difficult with the conventional road bridge widening unit.

  In addition, when there is an extension facility, etc., and only one side of the road can be widened, the required widening will be increased with one road bridge cover widening unit, but safety can be secured with the conventional road bridge widening unit. There was a problem that it was difficult.

  Furthermore, in the conventional road bridge cover widening unit, there is a problem that the weight increases when the widening is extended. For this reason, when the existing bridge has no proof strength, there is a problem that it becomes impossible to attach the road bridge cover widening unit itself. Moreover, when the existing ground cover of the bridge is small, there is a problem that the weight of the steel road bridge widening unit becomes heavier. In addition, if the weight is heavy, there is a problem that the price of the product becomes high.

  In addition, in the conventional road bridge cover widening unit, there is a problem that if the widening is extended, the asphalt thickness increases when the ground is covered. In addition, raising the asphalt from the beginning increases the weight and increases the burden on the existing bridge.

  In addition, in the conventional road bridge cover widening unit, the road bridge cover widening unit was fixed with anchor bolts by drilling a hole penetrating the road side concrete. When it becomes heavier, the upward tensile stress with respect to the bolt increases correspondingly, and if the strength of the concrete is not sufficiently high, cone breakage is likely to occur. Therefore, in the conventional road bridge cover widening unit, there is a problem that the post-construction anchor cannot be used when the widening is extended. The shear due to the cone fracture of the anchor bolt is 45 degrees with the end face of the floor slab, so that an extra length is required and the weight increases.

  Moreover, in the conventional road bridge cover widening unit, it is necessary to weld the anchor bar to the base plate, but there is a problem that welding distortion occurs and correction is required.

  Accordingly, a first object of the present invention is to solve the above-described problems and to increase the width of the road bridge while suppressing the increase in deflection, weight, asphalt thickness, welding distortion, and cost, and capable of extending the widening length. Is to provide.

In order to achieve the above object, a first aspect of the present invention is a steel road bridge covering widening unit,
(A) H-shaped steel having a web, an upper surface flange, and a lower surface flange, and a pair of receiving frames arranged in parallel;
(B) The bottom side and the left and right side edges are openings, and the upper surface portion, a front surface portion connected to one lower side of the upper surface portion, and the lower end of the upper surface portion facing the front surface portion. An inverted U-shaped face plate that forms a curbstone portion, and a back surface portion continuously provided on the side,
The left and right side edges are placed on the rear end upper part of the receiving frame so that the face plate is spanned between the pair of receiving frames, and the front surface portion is placed facing the front side of the receiving frame. Face plate,
(C) a flat plate placed over and placed on the pair of receiving frames, a base having left and right wing portions connected to a flange on the upper surface side of the pair of receiving frames;
A flat plate that is placed and connected in front of a portion to which the left and right wing portions are connected in a flange on the upper surface side of the receiving frame, and has a portion that extends forward from the front end of the receiving frame. A base plate having arms,
A road bridge land cover widening unit is provided.

  According to the first aspect of the present invention, since the section modulus of the receiving frame is increased, it is difficult for deflection to occur even if the widening is increased. Further, the strength can be ensured, and the secondary moment of section can be secured without using square bars. Furthermore, since it is made of steel, it is not necessary to reinforce the main body for installation, so the weight can be reduced. In addition, because of the frame structure, it is not necessary to increase the asphalt thickness. Further, when a load is applied, a compressive force acts on the side face of the floor slab, so that only a tensile force acts on the base plate, and thus a shearing force acts on the fixing bolt, so that a post-installed anchor can be used. Moreover, the installation extension for cone destruction prevention becomes unnecessary, and it is not necessary to lengthen the length from a concrete end surface for cone destruction prevention. Further, since most of the welding is between thin plates, a large amount of heat is not required for welding, and therefore welding distortion can be reduced. In addition, the cost is reduced because there is no need to reinforce the main body for installation. In addition, the construction cost can be reduced because the existing bridge can be demolished in a small area. Furthermore, since welding distortion is small, processing costs can be reduced. In addition, because of the bolt structure, it is possible to mount on-site assembly even in a small place.

  It is more preferable that the arm portion is a flat plate extending 300 mm or more forward from the front end of the receiving frame. Widening length can be made longer while suppressing increase in deflection and weight.

  It is preferable that the receiving frame has a tip plate that covers the front end face. Since the cross-sectional area closely contacting the end of the road increases and can be supported stably, it is less likely to bend.

  One or a plurality of angles arranged between the pair of receiving frames in a direction orthogonal to the longitudinal direction of the receiving frame, and connecting the pair of receiving frames by connecting an end portion to a web of the receiving frame It is preferable to have a load receiving angle of a book. Moreover, it is preferable that the said receiving frame equips the said web with the angle holding rib which fixes the said load receiving angle to a receiving frame. Since the load is received even at the load receiving angle, the load resistance is further increased. The angle holding rib is preferably provided by welding to the web of the receiving frame. The load receiving angle and the receiving frame can be connected by bolting, which is highly convenient.

  According to the present invention, it is possible to extend the widening length while suppressing an increase in deflection, weight, asphalt thickness, welding distortion, and cost.

It is a perspective view (1) of Example 1 of the road bridge covering widening unit of this invention. It is a perspective view (2) of Example 1 of the road bridge covering widening unit of this invention. It is a rear view of Example 1 of the road bridge covering widening unit of the present invention. It is a right view of Example 1 of the road bridge covering widening unit of this invention. It is a left view of Example 1 of the road bridge covering widening unit of this invention. It is a top view of Example 1 of the road bridge covering widening unit of the present invention. It is a front view of Example 1 of the road bridge covering widening unit of the present invention. It is internal structure explanatory drawing of Example 1 of the road bridge covering widening unit of this invention. It is explanatory drawing of the installation method of Example 1 of the road bridge covering widening unit of this invention.

  EXAMPLES Hereinafter, although this invention is concretely demonstrated using an Example about this invention, this invention is not limited to these.

  The road bridge cover widening unit of the first embodiment has a configuration in which the section modulus of the receiving frame is large, and can extend the widening length while suppressing an increase in deflection, weight, asphalt thickness, welding distortion, and cost. .

{Constitution}
FIG. 1: is a perspective view (1) of Example 1 of the road bridge covering widening unit of this invention. FIG. 1 is a diagram illustrating a plane (upper surface), a front surface, and a left side surface. FIG. 2: is a perspective view (2) of Example 1 of the road bridge covering widening unit of this invention. FIG. 2 is a diagram illustrating a plane, a back surface, and a right side surface. The road bridge cover widening unit 1 is made of steel so that the front plate 7 of the receiving frame 6 is in contact with the end of the concrete slab, with the back side facing the outside and the front side facing the concrete slab. The receiving frame 6 is installed side by side so that the longitudinal direction of the receiving frame 6 is parallel to the direction of passengers on the road. The road bridge land cover widening unit 1 is used by connecting one or more continuously along the road edge and connecting to each other.

  The receiving frame 6 is an H-shaped steel whose upper surface and lower surface are flanges, and has a web 63 between an upper surface flange 61 that is an upper surface side flange and a lower surface flange 62 that is a lower surface side flange. A front plate 7 is attached to one end of the receiving frame 6. In the present embodiment, the direction in which the front plate 7 is attached is the front, and the direction in which the front plate 7 is not attached is the rear. The receiving frame 6 has a long bar shape whose longitudinal direction is the front-rear direction.

  The road bridge widening unit 1 is a hollow unit that expands the road width of the road bridge, and is a right-angled U-shaped or square inverted U-shaped groove-shaped unit having an opening on the bottom side. It has a face plate 2 at its end and is particularly suitable for installation on a bridge. The hollow unit portion of the road bridge ground covering widening unit 1 can also serve as a curb and can serve as a ground covering portion. In the present embodiment, the hollow unit portion may be collectively referred to as a curbstone portion.

  The face plate 2 is formed by bending a steel plate in three directions continuously in the same direction. The bottom side and the left and right side edges are openings, and the upper surface part 24 and a lower end of the upper surface part. A front surface portion 23 provided continuously on the side, and a back surface portion 22 provided facing the front surface portion 23 and connected to the lower side of the other end of the upper surface portion 24 to form a curbstone portion.

  The side end is placed and connected to the upper part of the rear end of the upper surface flange 61 of the receiving frame 6 so that the front surface portion 23 is on the front side of the receiving frame 6. When placing, the side edge of the face plate is set so that the longitudinal direction of the face plate is perpendicular to the longitudinal direction of the receiving frame at the rear end of the receiving frame arranged in parallel at intervals slightly shorter than the longitudinal length of the face plate. Is placed on one receiving frame, and the other side edge of the same face plate is placed on the other receiving frame. That is, the left and right side edges of the face plate are placed and connected to the upper part of the rear end of the receiving frame so that the face plate spans the pair of receiving frames, with the front face facing the front side of the frame. .

  In this embodiment, the left and right ends of the face plate 2 are respectively placed on the receiving frame 6 and are fixed in a state where both ends are supported by the pair of receiving frames 6. The face plate 2 is connected to the upper surface flange 61 of the receiving frame 6 by a face plate receiving angle 5 of angle steel (L-shaped steel). More specifically, at one of the four positions at the lower left and right ends of the face plate 2, one side of the angle plate 5 of the angle iron (L-shaped steel) that is erected is bolted. The other side of the receiving angle 5 is bolted to the upper side of the upper surface flange 61 of the receiving frame 6. Two face plates 2 can be mounted side by side on one receiving frame 6. That is, the left end portion of one face plate 2 is connected to the right half of the upper surface flange 61 of the receiving frame 6 with the bolt 9, and the right end portion of the other face plate 2 is connected to the left half of the upper surface flange 61 of the receiving frame 6. Can connect. Adjacent face plates 2 are attached to the same face plate receiving angle 5 and connected to each other. Therefore, the face plate receiving angle 5 connects the two adjacent face plates 2 and the receiving frame 6 that supports the end portions of both face plates 2 with one.

  The connection between the face plate 2 and the receiving frame 6 is performed so that the back surface portion 22 of the face plate 2 is positioned above the rear end of the receiving frame 6. The longitudinal direction of the face plate 2 and the longitudinal direction of the receiving frame 6 are orthogonal to each other. In the road bridge cover widening unit 1 of this embodiment, the adjacent road bridge cover widening unit 1 shares the receiving frame 6 and the arm portion 32 of the base plate connected thereto, and is installed continuously.

  According to this embodiment, the face plate 2 has a longitudinal direction parallel to the longitudinal direction of the road on the rear end of a plurality of receiving frames provided perpendicular to the longitudinal direction of the road. That is, the curb is formed continuously.

  At the left and right ends of each road bridge cover widening unit 1, a right-angled U-shaped or square inverted U-shaped lock plate 10 is fitted along the inner surface of the face plate 2. Projecting to the outside of the inner wall of the left and right ends of the plate, and the lower end is placed on the face plate receiving angle 5. The lock plate 10 maintains the height between the upper surface portion 24 of the face plate 2 and the receiving frame 6 and prevents rattling. The face plate 2 has a plurality of face plate reinforcing ribs 21 that are partly welded and hung on the back side of the upper surface part, and are in contact with the inner surface of the front part and the rear part and partly welded and fixed. The number of sheets is not limited.

  FIG. 3 is a rear view of the first embodiment of the road bridge widening unit of the present invention.

  The load receiving angle 8 is an angle arranged between the pair of receiving frames 6 in a direction orthogonal to the longitudinal direction of the receiving frame 6, and by connecting both ends to the web 63 of the receiving frame 6, The receiving frames 6 are connected. The load receiving angle 8 is an L-shaped steel having an upper surface and a front surface depending on the upper surface, and the upper surface is adjusted to the same height as the upper surface flange 61 of the receiving frame 6. A hole is drilled.

  The receiving frame 6 is welded by erecting plate-shaped angle holding ribs 4 with bolt holes formed on the left and right sides of the web 63. The bolt holes on the left and right ends of the load receiving angle 8 are aligned with the bolt holes of the angle holding rib 4 and bolted to connect the receiving frame 6 and the load receiving angle 8. In one receiving frame, one load receiving angle 8 is held on the left side of the web 63, and another load receiving angle 8 is held on the right side of the web 63. Therefore, the angle holding rib 4 connects the two load receiving angles 8 adjacent to each other with the web 63 interposed therebetween, and the receiving frame 6 that supports the ends of both load receiving angles 8 by one.

  FIG. 4 is a right side view of Example 1 of the road bridge land cover widening unit of the present invention. FIG. 5 is a left side view of Example 1 of the road bridge land cover widening unit of the present invention. In this embodiment, the angle holding ribs 4 are provided on the left and right sides of the four webs 63, that is, a total of eight locations for one receiving frame 6, but the number of the frames is not limited. The face plate 2 is supported at both ends by the receiving frame 6 and is light in weight because there is no base plate or the like at the lower part of the central portion.

  FIG. 6 is a plan view of Example 1 of the road bridge land cover widening unit of the present invention. Moreover, FIG. 7 is a front view of Example 1 of the road bridge cover widening unit of the present invention.

  The base plate 3 has a base portion 31 and an arm portion 32. The base portion 31 is a flat plate placed over the pair of receiving frames 6 and has left and right wing portions connected to the upper surface flanges 61 of the pair of receiving frames 6. The arm portion 32 is a flat plate that is placed and connected in front of a portion of the upper surface flange 61 of the receiving frame 6 to which the left and right wing portions of the base portion 31 are connected, and is forward of the front end of the receiving frame 6. A plate having a stretched portion. The base portion 31 and the arm portion 32 have the same thickness and are adjusted so that the upper surface has the same height.

  In this embodiment, the base 31 is a T-shaped flat plate, the width including the left and right wing portions is the same as the length of the face plate 2 in the longitudinal direction, and the width of the portion without the left and right wing portions is a pair. The length of the base 31 is the same as the length between the receiving frames 6, the back of the base 31 is in contact with the front 23 of the face plate 2, and the left and right wings of the base 31 are on the left or right half of the top flange 61. The left and right wing portions of the base portion 31 are bolted to the upper surface flange 61 at two places on the left and right sides. A portion of the base portion 31 without the left and right wing portions rests on the load receiving angle 8 but is not bolted. The receiving frame 6 connects the adjacent base portions 31 to each other by bolting the adjacent base portions 31 to the same receiving frame 6.

  Further, in the present embodiment, the arm portion 32 is an I-shaped flat plate, and the width is twice the width of the left and right wing portions of the base portion 31, that is, the width of the upper surface flange 61 of the receiving frame 6. It is. The arm portion 32 covers all front sides of the left and right wing portions of the base portion 31 bolted to the upper surface flange 61, and is extended by 300 mm or more forward from the front end of the upper surface flange 61. In the present embodiment, the arm portion 32 is bolted to the upper surface flange 61 at six locations, and the extension portion is provided with six bolt holes for bolting to the concrete floor slab.

  The base plate 3 is not included in the curb portion. After the road bridge land cover widening unit 1 is installed at the end of the concrete slab, the tip of the arm portion 32 of the base plate 3 is attached and fixed on the concrete floor slab. Pour asphalt or the like above to expand the width of the roadway or sidewalk. A railing or a guard fence may be provided on the road bridge terrain widening unit 1.

  FIG. 8 is an explanatory diagram of the internal structure of Example 1 of the road bridge land cover widening unit of the present invention. FIG. 8 shows a state in which the base 31 and the arm 32 constituting the base plate 3 in FIG. 1 are removed.

The number of load receiving angles 8 is four in the present embodiment, but may be one or a plurality, and the number is not limited. The greater the load, the greater the load but the weight. However, the load resistance is dramatically greater even with the same weight as compared with the case of only the base plate. The upper portion of the load receiving angle 8 has a cutout corresponding to the thickness of the upper surface flange 61 of the receiving frame 6, whereby the height of the upper surface of the load receiving angle 8 and the height of the upper surface of the receiving frame 6 can be made uniform. .

  The road bridge land cover widening unit 1 includes a pair of receiving frames 6 made of H-shaped steel whose upper and lower surfaces are flanges and arranged in parallel, a face plate 2 connected to the upper rear end of the receiving frame, and a receiving frame. One or a plurality of load receiving angles 8 to be coupled, and a base portion having left and right wing portions connected to the receiving frame and a base plate 3 having an arm portion extending forward from the front end of the receiving frame.

  The receiving frame 6 may be such that the front end surface of the H-shaped steel is in contact with the end portion of the concrete floor slab, but in this embodiment, the receiving frame 6 is provided with a front plate 7 that covers the front end surface. Therefore, the entire front plate 7 of the receiving frame 6 is in contact with the concrete floor slab, and the cross-sectional area in contact with the plate is increased, so that it is more stable.

  FIG. 9 is an explanatory diagram of a method for installing the first embodiment of the road bridge widening unit of the present invention. The road bridge land cover widening unit 1 is installed by attaching the arm portion 32 of the base plate 3 with an anchor bolt on the ground cover removal portion at the end portion on the concrete floor slab side. On the back surface of the arm portion 32 and the front surface of the front plate 7 of the receiving frame 6, the side edge portion of the concrete floor slab C is covered and adhered, and the road bridge cover widening unit 1 is fixed to the concrete floor slab C with anchor bolts. . Asphalt D is paved on the base plate 3 so as to cover the base plate 3. According to this embodiment, the section modulus of the receiving frame is increased. Therefore, even if the widening becomes long, it is difficult for deflection to occur.

  In the road bridge widening unit continuously arranged, the receiving frame A and the receiving frame B on the right side of the receiving frame A are connected with the bases of the face plate S and the base plate G, and the receiving frame B and the receiving frame on the right side of the receiving frame B are connected. The base of another face plate M and another base plate H installed continuously next to the face plate S is stretched over and connected to the frame C. At this time, on the upper surface flange of the receiving frame B, the right end of the rear end face plate S and the left end of the face plate M are connected, and the right wing portion of the base portion of the base plate G and the base plate are connected to the front side where the face plate is connected. The left wing portion of the base portion of H is connected, and the arm portion of the base plate is connected to the front side thereof. The base plate arm is connected to all receiving frames, and is fixed to the concrete slab by the extension of the arm.

  In this embodiment, the concrete floor slab C has a thickness of 200 mm, and the asphalt D has a thickness of 50 mm. When bent, the asphalt breaks, but according to this embodiment, there is little deflection and there is no fear of the asphalt breaking. Further, since an anchor bar requiring an asphalt thickness of 92 mm is not required, the thickness of the asphalt can be reduced accordingly. In addition, the cost is extremely low as compared with the method of raising the bulk with expensive polymer cement.

  In this embodiment, the length of the face plate 2 in the longitudinal direction is 994 mm, the length in the width direction is 400 mm, and the height is 300 mm, but the size is not limited to this. According to the present embodiment, the road width increases by the distance from the front plate 7 of the receiving frame 6 to the back surface portion 22 of the face plate 2, that is, by the length of the receiving frame 6.

  In the present embodiment, the receiving frame 6 has a length of 1000 mm, a width and a height of 200 mm, and a length from the back surface portion 22 of the face plate 2 to the tip of the arm portion 32 is 1360 mm.

  As a result of the structural calculation performed by the road bridge widening unit of this example, even if the assumed wheel load and collision load are combined, the applied stress is within the allowable stress range. It was found that the widening unit is excellent in safety.

  The receiving frame can be up to 2000 mm in length, and therefore the widening length can be made much longer than before.

{effect}
According to the present embodiment, it is possible to extend the widening length while suppressing an increase in deflection, weight, asphalt thickness, welding distortion, and cost.

  According to the present embodiment, since the section modulus of the receiving frame is increased, it is difficult for the deflection to occur even if the widening is increased. Further, the strength can be ensured, and the secondary moment of section can be secured without using square bars. Furthermore, since it is made of steel, it is not necessary to reinforce the main body for installation, so the weight can be reduced. In addition, because of the frame structure, it is not necessary to increase the asphalt thickness. Further, when a load is applied, a compressive force acts on the side face of the floor slab, so that only a tensile force acts on the base plate, and thus a shearing force acts on the fixing bolt, so that a post-installed anchor can be used. Moreover, the installation extension for cone destruction prevention becomes unnecessary, and it is not necessary to lengthen the length from a concrete end surface for cone destruction prevention. Further, since most of the welding is between thin plates, a large amount of heat is not required for welding, and therefore welding distortion can be reduced. In addition, the cost is reduced because there is no need to reinforce the main body for installation. In addition, the construction cost can be reduced because the existing bridge can be demolished in a small area. Furthermore, since welding distortion is small, processing costs can be reduced. Moreover, since it is a bolt structure, it can be assembled and installed in the field even in a narrow place. In addition, since the cross-sectional area that is in close contact with the end of the road increases and can be stably supported, bending is unlikely to occur. The angle holding rib is preferably provided by welding to the web of the receiving frame. The load receiving angle and the receiving frame can be connected by bolting, which is highly convenient.

  In addition, when widening only the sidewalk at the end of the road, even if there is no pedestrian separation fence, it should be widened in consideration of the wheel load, assuming a car parked on the sidewalk or a car entering the sidewalk. Can do. In addition, when there is an extension facility, etc., and only one side of the road can be widened, the required widening is increased with one road bridge cover widening unit, but according to this embodiment, since the deflection is small, safety should be ensured. Can do. In addition, since the asphalt thickness is thin, the burden on the existing bridge is small.

  According to the present embodiment, a widening of 1000 mm or more can be realized. Moreover, since the asphalt thickness should just be 50 mm or more, it does not need to thicken at most existing bridges. Moreover, since post-construction anchors are possible, it can be fixed even on PC (precast concrete) bridges and floor slab bridges.

  The present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the invention. In addition, the constituent elements of the above embodiments can be arbitrarily combined without departing from the spirit of the invention.

DESCRIPTION OF SYMBOLS 1 Road bridge cover widening unit 2 Faceplate 21 Faceplate reinforcement rib 22 Back surface part 23 Front surface part 24 Upper surface part 3 Base plate 31 Base part 32 Arm part 4 Angle holding rib 5 Faceplate receiving angle 6 Receiving frame 61 Upper surface flange 62 Lower surface flange 63 Web 7 Tip plate 8 Load receiving angle 9 Bolt 10 Lock plate C Concrete floor slab D Asphalt

Claims (4)

A steel road bridge cover widening unit,
(A) H-shaped steel having a web, an upper surface flange, and a lower surface flange, and a pair of receiving frames arranged in parallel;
(B) The bottom side and the left and right side edges are openings, and the upper surface portion, a front surface portion connected to one lower side of the upper surface portion, and the lower end of the upper surface portion facing the front surface portion. An inverted U-shaped face plate that forms a curbstone portion, and a back surface portion continuously provided on the side,
The left and right side edges are placed on the rear end upper part of the receiving frame so that the face plate is spanned between the pair of receiving frames, and the front surface portion is placed facing the front side of the receiving frame. Face plate,
(C) a flat plate placed over and placed on the pair of receiving frames, a base having left and right wing portions connected to a flange on the upper surface side of the pair of receiving frames;
A flat plate that is placed and connected in front of a portion to which the left and right wing portions are connected in a flange on the upper surface side of the receiving frame, and has a portion that extends forward from the front end of the receiving frame. A base plate having arms,
A road bridge land cover widening unit characterized by comprising: The road bridge terrain widening unit according to claim 1, wherein the receiving frame has a tip plate that covers a front end face. One or a plurality of angles arranged between the pair of receiving frames in a direction orthogonal to the longitudinal direction of the receiving frame, and connecting the pair of receiving frames by connecting an end portion to a web of the receiving frame The road bridge land cover widening unit according to claim 1 or 2, characterized in that it has a load receiving angle of a book. The road bridge ground covering widening unit according to claim 3, wherein the receiving frame includes an angle holding rib for receiving the load receiving angle and fixing the load receiving angle to the frame.

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