JP2019065663A - Wheel guard widening unit and construction method thereof - Google Patents

Abstract

To provide a wheel guard widening unit capable of preventing asphalt from cracking so that it is possible to use a metal type anchor.SOLUTION: A wheel guard widening unit comprises: a face plate 2; and a base plate 3 arranged on the side of the bottom of the face plate 2 to form a hollow curb part 10 in connection with the face plate 2 which extends in the lateral direction in a view from the front side, wherein the face plate 2 is combined to be attached on the base plate 3 so that a left side end of the face plate 2 is located in the vicinity of the center of the base plate 3 and a right side end of the base plate 3 is located in the vicinity of the center of the face plate 2.SELECTED DRAWING: Figure 1

Description

  BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a land covering widening unit installed to extend road width in a road bridge.

  In the past, the ground spreading unit was used instead of a method of removing the ground covering on the side edge of the floor and connecting the ground covering with concrete to the outer side of the floor as an expansion means of the road width consisting of concrete floor slabs. A ground covering widening unit made of steel is known which extends outward on the front side and fixes it to the ground covering removal portion at the end of the floor slab side (see, for example, Patent Documents 1, 2 and 3).

Patent 3377764 Patent No. 6153187 Patent No. 6166005

  The anchor fixing method is generally a penetration method, but when the floor slab is thick, the fixing method by a post-construction anchor is used. Post-installed anchors include metal anchors and adhesive anchors. Usually, as a method of drilling concrete, a hammer drill is used for a drilling length of 200 mm or less. When the drilling length is 200 mm to 500 mm, although the hand hammer corresponds, the impact is too strong and the concrete floor slab around the drilling is cracked, so it can not be used in practice. When the drilling length is 500 mm to 1000 mm, although the core boring machine corresponds, there is a possibility of cutting the rebar. A core boring machine uses a diamond bit, but there is a risk of cutting and drilling as it is unknown even if the diamond bit and the reinforcing bar come in contact with each other. Therefore, for example, when the floor slab thickness is 540 mm, first, drilling is performed by about 200 mm using a hammer drill, and the anchor is fixed using the construction anchor after the adhesive anchor.

  In the case of a precast (PC) floor slab, in the case of the penetration type, the compressive force introduced by the precast (PC) cable may cause loss due to cross section loss, and the lower flange in a precast (PC) girder such as I-shaped girder Can not use the penetration formula because there is a risk of causing a cross section defect. Therefore, there was only a method of fixing the post-construction anchor after the adhesion-type anchor.

  However, with regard to adhesive type anchors, it has been found by an accident investigation of a post-tunnel tunnel that hydrolysis may occur in an alkaline environment depending on the type of organic adhesive. The influence of the degree of progress of such hydrolysis on the adhesion is not well understood. The base material concrete has an alkaline environment.

  In addition to organic adhesives, inorganic adhesives are also present, but their workability is not so good. In addition, adhesive anchors are currently in a poor state of knowledge regarding the fatigue properties and long-term durability of adhesives.

Moreover, in the conventional ground cover widening, the face plate which forms a curb, and the base plate which the side plate and the side end on either side are the same were made into one unit. Such a unit had a rectangular shape with a portion of the curb raised up, and was simply arranged in the left-right direction. Therefore, there is a horizontal boundary between the units at the same position from the bottom to the top. The portion of the base plate covers the asphalt and functions as a widening portion of the road, so the weight of the vehicle is added from the top every time the vehicle travels.
Form a widening section as a road.

  However, in the conventional configuration, there is a problem that a metal-based anchor which has no proof stress and which has less tensile force than an adhesive-based anchor can not be used.

  Further, in the conventional configuration, when the vehicle travels in the wide portion, the rectangular unit has a problem that it bends in units and causes sinking and floating like a white key of a piano keyboard. Such a problem is remarkable particularly when the amount of widening is large and the asphalt thickness is thin, and there is a problem that the asphalt is cracked along the boundary between the units arranged on the left and right.

  Therefore, the first object of the present invention is to solve the above-mentioned problems and to provide a ground spreading unit that can prevent asphalt cracking and use a metal anchor.

According to a first aspect of the present invention, in order to achieve the above object, an upper surface portion, a front surface portion connected to one end lower side of the upper surface portion, and the other end lower side of the upper surface portion facing the front surface portion An inverted U-shaped face plate having a rear surface portion connected to the rear surface and the bottom and left and right side ends being openings,
A ground spreading unit comprising: a base plate disposed on the bottom side of the face plate and combined with the face plate to form a hollow rim portion extending in the left-right direction when viewed from the front side;
The face plate is mounted on and combined with the base plate such that the left end of the face plate is located near the center of the base plate and the right end of the base plate is located near the center of the face plate. To provide a ground covering unit characterized by the present invention.

  According to the first aspect of the present invention, the number of anchors per unit is calculated by the number of anchors used in one base plate in the conventional configuration, and can be combined alternately to form a continuum. Since the load resistance calculation can be performed by the above, the load resistance can be secured even with a metal-based anchor having a smaller tensile force than the adhesive-based anchor, and therefore, a metal-based anchor can be used. In addition, since the combination of units results in a continuous structure, even if the anchor portion is broken or the like, since it is held by the left and right units in series, it is possible to prevent the fall. Moreover, even if a part is broken, the whole continuum is hard to be broken as a whole, and the function as a curb can be continuously performed, thereby ensuring redundancy. According to a first aspect of the invention, even precast floor slabs can be installed using metal-based anchors. In addition, since the left and right side ends of the base plate and the left and right side ends of the face plate are offset, the base plates arranged side by side can be alternately combined to form a continuous body so that the face plate bridges. As a one-piece construction, there is no lateral boundary between units and therefore no deflection occurs, thus preventing asphalt cracking at the left and right end portions of the base plate.

Also, the base plate is
A back side plate erected on the upper surface of the rear end of the base plate, the right half being connected to the left half of the inner surface of the back side of the face plate when viewed from the front side;
A front side plate erected on the upper surface of the base plate in parallel with the rear side plate, the right half being connected to the left half of the front side outer surface of the face plate;
A plurality of base plate reinforcing ribs provided upright on the upper surface of the base plate and connecting the front side plate and the rear side plate;
It is preferable to have The base plate and the face plate can be connected more firmly.

According to a second aspect of the present invention, in order to achieve the above object, the ground covering widening units according to the first aspect of the present invention are continuously arranged in the left-right direction,
Connecting the right and left ground cover widening units by putting the right half of the face plate of the ground cover widening unit of 1 on the left half of the base plate of the ground cover widening unit next to the right and connecting them To provide a method of installing a widening unit.

  According to the second aspect of the present invention, since the base plate and the face plate of adjacent units are alternately combined to form a continuous body, it is possible to perform the proof calculation with double the number of anchors in the prior art. Even with a metal anchor having a low tensile force, load resistance can be ensured, and therefore, a metal anchor can be used. In addition, since a continuous body is formed, even if the anchor portion is broken or the like, since it is held by the left and right units in series, it is possible to prevent the fall. Moreover, even if a part is broken, the whole continuum is hard to be broken as a whole, and the function as a curb can be continuously performed, thereby ensuring redundancy. According to a second aspect of the invention, even precast floor slabs can be installed using metal-based anchors. In addition, since the left and right side ends of the base plate and the left and right side ends of the face plate are offset, a continuous body is formed by alternately combining the base plates arranged side by side so that the face plate bridges. Because of the one-piece construction, there is no left-right boundary between the units, so deflection is less likely to occur and thus cracking of the asphalt can be prevented.

  According to the invention, metal based anchors can be used. In addition, it is possible to prevent a fall and to ensure redundancy. In addition, cracking of asphalt can be prevented.

It is a perspective view of Example 1 of a ground covering widening unit of the present invention. It is a front view of Example 1 of a ground covering widening unit of the present invention. It is a right side view of Example 1 of a ground covering widening unit of the present invention. It is a left side view of Example 1 of a ground covering widening unit of the present invention. It is a top view of Example 1 of a ground covering widening unit of the present invention. It is a bottom view of Example 1 of a ground covering widening unit of the present invention. It is a rear view of Example 1 of a ground covering widening unit of the present invention. It is the sectional view on the AA line of Example 1 of the ground covering widening unit of the present invention. It is a BB sectional view taken on the line of Example 1 of the ground covering widening unit of the present invention.

  EXAMPLES Hereinafter, the present invention will be specifically described using examples, but the present invention is not limited to these.

  The ground covering widening unit according to the first embodiment constitutes a ground covering widening structure in which the width of the road is extended by arranging in series, and the base plate and the face plate to be paired are mutually offset by half the end in the lateral direction. It is A plurality of ground covering widening units are arranged side by side so that one face plate is placed over the left half of the right side base plate and the right half of the left side base plate of two base plates side by side on the lower side. , Fixed and formed. The widening units are connected in the left-right direction to form one widening structure.

{Constitution}

  FIG. 1 is a perspective view of a ground covering widening unit according to a first embodiment of the present invention. FIG. 1 is a diagram showing a plane (upper surface), a front, and a left side.

The ground covering widening unit 1 according to the first embodiment of the present invention has a face plate 2, a base plate 3 and a belly plate 6. The ground covering widening unit 1 according to the first embodiment of the present invention is made of steel, and the back side is the outside, the front side (the front) is the floor, and the side of the floor is the end of the floor. It arranges in order and arranges continuously so that the tip part bent surface part 67 of belly plate 6 may touch. In the present embodiment, the floor plate to which the ground covering widening unit 1 is attached is a precast (PC) floor plate, but it may be a normal concrete floor plate or a thick concrete floor plate.
The ground covering widening unit 1 according to the first embodiment of the present invention has a hollow portion serving as a curb at a rear end, and is particularly suitable for installation on a bridge. The ground covering widening unit 1 of the first embodiment is connected to constitute a ground covering widening structure.

  The face plate 2 is an inverted U-shape, and the upper surface 24, the front surface 23 continuously connected to the lower end of the upper surface 24, and the lower surface of the upper surface 24 facing the front surface 23 are continuous. The bottom side and the left and right side ends are openings. In the present application, the right and left direction is specified with the front side as the front and the rear side as the back.

  The base plate 3 is disposed on the bottom side of the face plate 2 and combined with the face plate 2 to form a hollow curb stone portion 10 extending in the left-right direction when viewed from the front side.

  The face plate 2 is mounted on the base plate 3 so that the left end of the face plate 2 is located near the center of the base plate 3 and the right end of the base plate 3 is located near the center of the face plate 2.

  In the construction method of the ground covering widening unit according to the first embodiment of the present invention, the ground covering widening unit is arranged continuously in the left-right direction, and the right half of the face plate of one ground covering widening unit is The left and right ground covering widening units are connected by putting them on the left half of the base plate.

  The base plates of each unit are arranged side by side continuously, and the face plate of each unit is placed over the adjacent base plates so as to be fixed to the two lower base plates on both sides. .

  By connecting the ground covering widening units according to the first embodiment of the present invention, since it becomes a continuous body as a structure, it is possible to calculate resistance with an anchor twice as many as the number of anchors attached to a floor plate. Therefore, according to the ground spreading unit according to the first embodiment of the present invention, it is possible to use not only the adhesive anchor but also the metal anchor having a smaller tensile force than the adhesive anchor.

  The base plate 3 has a back side plate 37, a front side plate 36, and a base plate reinforcing rib 31.

The rear side plate 37 is erected on the upper surface of the rear end of the base plate 3, and the right half is connected to the left half of the inner surface of the rear portion 22 of the face plate 2 when viewed from the front side.

  The front side plate 36 is erected on the upper surface of the base plate 3 in parallel with the back side plate 37, and the right half is connected to the left half of the outer surface of the front portion 23 of the face plate 2.

  The base plate reinforcing rib 31 is provided upright on the upper surface of the base plate 3 to connect the front side plate 36 and the rear side plate 37. A plurality of base plate reinforcing ribs 31 are provided in parallel. The base plate reinforcing rib 31 plays a role of reinforcing the impact from the front side and the upper side in the curb stone 10.

  In this embodiment, three bolt holes 38 for attaching the base plate 3 to the floor plate are formed. A metal anchor can be attached to the bolt hole 38. In the case of the conventional ground covering widening unit, the resistance calculation is performed with three anchors per unit, but in the present embodiment, the base plate and the face plate are combined so that the left and right ends thereof become alternately to form a continuous body. The load resistance can be calculated with six double anchors.

  The base plate 3 has a curb bottom 32 disposed on the bottom side of the face plate 2 and forming a hollow curb 10 in combination with the face plate 2 and is flush with the curb bottom 32 and the front side of the face plate 2 is outside. And a stretched portion 33 stretched in the In the base plate 3, the front side (front side) of the front surface portion 23 of the face plate 2, that is, the portion extending to the floor plate side (extension portion 33) is not included in the curb stone 10, and the lower portion of the face plate 2 The portion (curb stone bottom portion 32) is included in the curb stone portion 10.

  At the left and right ends of the face plate 2, lock plates 8 having a right-angled U-shape, that is, a square inverted U-shape are fitted along the inner surface of the face plate 2, and the lock plates 8 are face plates It protrudes to the outer side of the left and right end inner wall of 2. The lock plate 8 is shared with the face plates of adjacent ground spreading units, and one lock plate 8 is fitted along the inner side of each face plate of two ground spread units connected to each other. The lock plate 8 maintains the height between the top surface 24 of the face plate 2 and the base plate 3 to prevent rattling.

FIG. 2 is a front view of Embodiment 1 of the ground covering widening unit of the present invention. The illustration of the lock plate 8 is omitted in FIGS. FIG. 3 is a right side view of Embodiment 1 of the ground covering widening unit of the present invention. FIG. 4 is a left side view of Embodiment 1 of the ground spreading unit according to the present invention. Moreover, FIG. 5 is a top view of Example 1 of the ground covering widening unit of this invention. Moreover, FIG. 6 is a bottom view of Example 1 of the ground covering widening unit of this invention. Moreover, FIG. 7 is a rear view of Example 1 of the ground covering widening unit of this invention. Moreover, FIG. 8 is the sectional view on the AA line of Example 1 of the ground covering widening unit of this invention. Moreover, FIG. 9 is the BB sectional drawing of Example 1 of the ground covering widening unit of this invention. In FIG. 9, the illustration of the face plate 2 which is seen behind the paper surface is omitted.

  The belly plate 6 is fixed to the back surface of the base plate 3 and is attached in a state in which the front bent surface portion 67 is in contact with the side of the floor slab. Bolts can be attached to the bolt holes 68 of the belly plate 6 to fix the belly plate 6 to the side of the floor plate.

  Anchor bars 35 a to 35 f are provided on the upper surface side of the base plate 3. The anchor bars 35 a to 35 f are rod-like ribs provided in the direction from the extension portion 33 of the base plate 3 to the curb stone bottom portion 32 and reach the inside of the curb stone portion 10. The anchor bars 35 a to 35 c are provided on the left side of the base plate 3, and the anchor bars 35 d to 35 f are provided on the right side of the base plate 3. Bolt holes 38 are provided at a total of three locations at the center and left and right uniform positions on the tip end side of the extension portion 33, and the anchor bars 35a and 35f become short in the tip end side of the extension portion 33 There is.

  The ground covering widening unit 1 mounts the base plate 3 on the floor plate, and then mounts and fixes the base plate 3 on the floor plate. In the present embodiment, the base plate 3 has a curb bottom portion 32 which is a lower portion of the curb portion 10, and an extending portion 33 which is a portion of the curb portion 10 extending outward from the curb bottom portion 32. , Pour asphalt or the like onto the extension portion 33 to extend the width of the roadway or the sidewalk. A balustrade, a protective fence or the like may be provided on the ground covering widening unit 1.

  The front side plate 36 and the back side plate 37 are vertically erected on the upper surface side of the curb bottom 32 of the base plate 3 and welded. A plurality of base plate reinforcing ribs 31 are welded to the inner side surfaces of the front side plate 36 and the rear side plate 37. There is a notch in the lower part of the front side plate 36, and the anchor bar 35 is inserted and fixed at a right angle. In the present embodiment, the anchor bar 35 has a thickness of about 20 mm, but is not limited thereto. In the present embodiment, a notch is also provided in the lower portion of the front surface portion 23 of the face plate 2 attached and fixed to the front side plate 36. The notches in the lower part of the front side plate 36 are notches into which the anchor bars 35 are inserted one by one, and six places are provided in the front plate side plate 36. The notch in the lower part of the front part 23 of the face plate 2 has a size in which three anchor bars fixed to the base plate 3 enter, and the left end, center and parts excluding the right end of the front part 23 of the face plate 2 It is provided in two places.

  The base plate 3 is a flat steel plate disposed on the bottom side of the face plate 2 and is longer than the length from the front surface portion 23 to the back surface portion 22 of the face plate 2. The opening on the bottom side of the plate 2 is closed to form a curb stone 10 which is a rectangular hollow cylindrical box.

  In the ground covering widening unit 1 of the present embodiment, the front surface 23 is rectangular in a front view, the upper surface 24 is rectangular in a top surface, the rear 22 is rectangular in a rear, and the curb stone 10 is a hollow rectangular solid. A plurality of face plate reinforcing ribs 21 are provided by welding a part of the face plate reinforcing rib 21 on the back side of the upper surface portion 24 and the number is not limited. The lower end of each of the face plate reinforcing ribs 21 is below the upper end of the base plate reinforcing rib 8 and abuts against the inner side surfaces of the front surface portion 23 and the back surface portion 22 so that a part is welded and fixed.

  The front side plate 36 and the front side portion 23, and the back side plate 37 and the back side portion 22 are brought into close contact with each other and fixed by bolts 9. The front side plate 36 and the rear side plate 37 are respectively inside the front portion 23 and the rear portion 22.

  The face plate 2 is formed by bending a steel plate in three directions continuously in the same direction to form a square U-shape or a square inverted U-shape. That is, the face plate 2 has an upper surface 24, a front surface 23 whose upper end is continuous with one end of the upper surface 24 and which is perpendicular to the upper surface 24, and an upper end is the other end of the upper surface 24. It has a back face 22 which is continuous and faces in parallel with the front face 23.

  The abdominal plate 6 is L-shaped having a base folding surface 66 and a tip folding surface 67, and the base folding surface 66 is fixed to the back surface of the base plate 3 and the tip folding surface 67 protrudes downward. It is done. The belly plate 6 is fixed to the back side of the base plate 3 by a bolt 9. The abdominal plate 6 has an abdominal plate reinforcing rib 61 fixed in contact with the inner side surface of the base curved portion 66 and the tip curved portion 67. The abdominal plate reinforcing rib 61 is welded and fixed to the base curved surface portion 66 and the tip curved surface portion 67. The abdominal plate reinforcing rib 61 is provided perpendicularly to the base curved surface 66 and the tip curved surface 67. In the present embodiment, the fore-end curved surface portion 67 is located below the extending portion 33.

  In the present embodiment, although the number of the abdominal plate reinforcing ribs 61 is three, it is not limited thereto. The face plate reinforcing rib 21 and the base plate reinforcing rib 31 do not overlap with each other. The face plate reinforcing rib 21, the base plate reinforcing rib 31 and the belly plate reinforcing rib 61 all play a role of maintaining strength.

  In the front face portion 23, one guard plate 7 is provided above the bolt 9 from the right end to the left end. Further, a bolt hole 68 is bored in the end portion curved surface portion 67 of the abdominal plate 6.

  In the present embodiment, the length in the longitudinal direction of the face plate 2 is 1194 mm, the length in the width direction is 367 mm, and the height is 334 mm, but the size is not limited thereto. Note that according to the present embodiment, the road width extends by the distance from the portion of the base plate 3 where the front bent surface portion 67 is provided to the outer end of the base plate 3.

{effect}
According to the present embodiment, although the resistance calculation per unit is performed with the number of anchors (three) used in one base plate in the conventional configuration, it is possible to combine them alternately to form a continuum. Since the proof stress calculation can be performed by (6), the proof stress can be secured even with a metallic anchor having a smaller tensile force than the adhesive anchor, and therefore, the metallic anchor can be used.

  Moreover, according to the present embodiment, the base plates and face plates of adjacent units can be alternately combined to form a continuous body.

  Further, according to the present embodiment, when the units are combined, the structure becomes a continuous body. Therefore, even if the anchor portion is broken or the like, since it is held by the left and right units connected, it is prevented from falling.

  Further, according to this embodiment, even if a part is broken, the whole continuum is unlikely to be broken and the function as a curb can be continuously performed, so redundancy is secured.

  Further, according to the present embodiment, since the left and right side ends of the base plate and the left and right side ends of the face plate are shifted, the base plates arranged side by side are alternately combined to form a continuous body so that the face plate bridges. Because the land cover widens integrally, there is no horizontal boundary between the units. Therefore, deflection hardly occurs. Therefore, even if the amount of widening is large and the thickness of asphalt is thin, asphalt can be prevented from being cracked at the left and right end portions of the base plate like a white key of a piano keyboard.

  The present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the invention. Further, the components of the above-described embodiments can be arbitrarily combined without departing from the spirit of the invention.

Reference Signs List 1 ground covering widening unit 2 face plate 21 face plate reinforcing rib 22 back surface portion 23 front surface portion 24 top surface portion 3 base plate 31 base plate reinforcing rib 32 curb stone bottom surface portion 33 extending portions 35a, b, c, d, e, f anchor bar 36 front surface Side plate 37 back side plate 38 bolt hole 6 belly plate 61 belly plate reinforcing rib 66 base bent surface portion 67 tip bent surface portion 68 bolt hole 7 guard plate 8 lock plate 9 bolt 10 rim stone portion

Claims (3)

It has a top surface portion, a front surface portion continuously connected to one end lower side of the top surface portion, and a back surface portion continuous to the other end lower side of the top surface portion facing the front surface portion. An inverted U-shaped face plate whose side end is an opening;
A ground spreading unit comprising: a base plate disposed on the bottom side of the face plate and combined with the face plate to form a hollow rim portion extending in the left-right direction when viewed from the front side;
The face plate is mounted on and combined with the base plate such that the left end of the face plate is located near the center of the base plate and the right end of the base plate is located near the center of the face plate. Ground covering widening unit that features. The base plate is
A back side plate erected on the upper surface of the rear end of the base plate, the right half being connected to the left half of the inner surface of the back side of the face plate when viewed from the front side;
A front side plate erected on the upper surface of the base plate in parallel with the rear side plate, the right half being connected to the left half of the front side outer surface of the face plate;
A plurality of base plate reinforcing ribs provided upright on the upper surface of the base plate and connecting the front side plate and the rear side plate;
The ground covering widening unit according to claim 1, characterized in that: The ground covering widening unit according to claim 1 or 2 is continuously arranged in the left-right direction,
Connecting the right and left ground cover widening units by putting the right half of the face plate of the ground cover widening unit of 1 on the left half of the base plate of the ground cover widening unit next to the right and connecting them Construction method of oversized widening unit.

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