JP5043879B2 - How to install width expansion materials for road bridges - Google Patents

Description

The present invention relates to a method for installing a width extension material for a road bridge of a road bridge made of a concrete floor slab.

Road bridges designed and constructed under the old road structure ordinance point out the lack of width due to the increase in the size of passing vehicles, and it is also difficult to secure road shoulders for emergency vehicles and pedestrian sidewalks. There is an urgent need to expand the width in order to maintain safe and smooth traffic. In addition, even if the total width is expanded due to road maintenance and securing of the shoulder, there is a problem that the vehicle cannot smoothly pass by the conventional total width at the bridge portion. In addition, there are many bridges that conflict with the new road structure ordinance in the installation of vehicle protection fences.

Conventionally, in the first prior art of this kind (not shown), when the road bridge floor slab is a concrete floor slab, first, the projecting portion of the concrete floor slab is cut vertically at a predetermined position. After removing and reinforce the reinforcing bars exposed from the main body side of the concrete slab, the reinforcing bars longer than the existing ones were connected and integrated, and then the concrete was cast again to extend the overhang. And the ground cover part was newly provided in the side edge part of the extended overhang | projection part.

Further, as an example of the second prior art, there is a technique disclosed in FIG. 4 of Japanese Patent Application Laid-Open No. 2004-176400, as shown in FIG. That is, first, a cantilever 2 is attached by overhanging from the main girder 1, and the overhanging portion outside the main girder 1 of the concrete floor slab 3 is cut vertically at an appropriate position P between the main girder 1 and the ground cover 4. Remove. Next, the main reinforcing bar 5 at the end of the concrete floor slab 3 is exposed, and a lightweight steel floor slab 6 is carried into the removed portion and placed on the cantilever beam 2. And the main reinforcement 5 and the extension main reinforcement 7 are connected in the connection part of the concrete floor slab 3 and the steel floor slab 6, and the filler 8 is inject | poured and integrated in the same part space. 9 is a steel plate for connection.

As an example of the third prior art, there is a technique disclosed in Japanese Patent Laid-Open No. 2001-49618 as shown in FIG. That is, the road bridge road width expanding ground covering unit is formed by the steel hollow cylinder 4A and the abdomen 4B. The steel hollow cylinder 4A includes a bottom plate portion 2A at the lower end of the front side 1a and the back side 1c of a steel ground covering portion 1A provided with a front side 1a, an upper side 1b, and a back side 1c. The bottom plate portion 2A is integrated with the extending portion 2a and the bottom surface side 2b outside the back surface side 1c of the ground covering portion 1A. In this example, the ground cover portion 1A and the bottom plate portion 2A are separately formed, and the side plates 3a and 3b that are in close contact with the inner surfaces of the front surface side 1a and the back surface side 1c of the ground cover portion 1A are welded to the bottom plate portion 2A. The side plates 3a and 3b are fastened and attached using bolts 4a and 4b in accordance with the inner surfaces of the front side 1a and the back side 1c of the ground covering portion 1A and integrated. In the third prior art, there is a road width expansion material provided with a steel hollow cylinder 4A. However, a high-strength bolt 4a, 4b, etc. are formed on the front surface because of the double steel plate. It was an exposed configuration.
Japanese Patent Laid-Open No. 2004-176400 Japanese Patent Laid-Open No. 2001-49618

Since the conventional technology has the above-described configuration, the following problems exist.
In the prior art, the road bridge expansion method and its structure, in particular in the first prior art, is to cast concrete with additional concrete, so the main girder due to the increase in the weight of the concrete slab 3 There have been various problems in maintaining the strength of the concrete slab 3 such as insufficient strength of the steel plate, insufficient amount of reinforcing bars above the main girder, and insufficient durability of the concrete casting joint. In addition, since the part to be added is made of concrete, it takes time for curing and hardening of the concrete, and there is a problem that the traffic regulation associated with the construction is prolonged.
In the second prior art, all are welded structures and high proof stress, but there is a problem that the weight is heavy and the workability is lacking. There is a problem that the floor slab 3 cannot be tolerated, and there is a problem that the proof strength of the ground cover 4 is limited when the end portion of the existing concrete floor slab 3 is set to the position of the front plate. Furthermore, there was a problem that the influence of damaging the belly plate of the main girder was great.
Further, in the third prior art, since the ground cover portion 1A and the side plate 3a of the bottom plate portion 2A are integrated by the bolt 4a, the proof stress is low, and when the collision load is applied, There is a problem that the concrete floor slab cannot withstand the support pressure from the plate 4B, and when the end of the existing concrete floor slab is positioned outward from the back plate 1c, the proof strength of the ground cover 1A is insufficient. There was a problem of doing. Further, the steel hollow cylinder 4A has a structure in which the reinforcing rib 2c is installed on the bottom plate portion 2A, and there is a problem that it is difficult to adjust the road bridge surface and the workability is inferior. The road width extension member made of double steel plates is heavy and has high strength bolts 4a, 4b and the like exposed to the outside. there were.

Further, the road bridge expansion method and structure in the first to third conventional techniques described above are complicated and complicated in the construction method, and the members necessary for the width expansion are also heavy and the parts are increased. There are various numbers, and particularly when the expansion width of the width is relatively small, there is a problem that the comparative advantage is inferior in terms of construction difficulty, construction period and construction cost.

In the present invention, when expanding the width of a road bridge made of a concrete slab, the width expansion material for a road bridge includes a steel ground cover and is configured as a completely integrated structure with the concrete slab. That is, in the width expansion material for road bridges having a predetermined length, the width expansion material for road bridges of two types, that is, the width expansion material for road bridges as a support member having a substantially T-shaped support member and the inside of the ground cover The road bridge width expanding material as an intermediate member provided with a substantially ring-shaped reinforcing rib without being provided with a substantially T-shaped support member is arranged alternately and continuously via joints (gap). In addition, the reinforcing ribs in front of the ground cover are eliminated and a flange of a belly plate is provided on the bottom surface of the ground cover, and the ground cover portion and the entire top surface, side surface and bottom surface of the concrete floor slab are bonded with an epoxy resin, and a vehicle collision accident Technology that prevents the destruction of concrete slabs, significantly reduces the weight while maintaining the required strength, further increases the overhang and strength of the ground cover, and improves the workability to shorten the construction period. Is intended to provide Configuration of, established from the means.

According to invention of Claim 1, it is the installation method of the width expansion material in a road bridge, Comprising: In the road bridge comprised by the concrete floor slab and the concrete ground cover, it forms with a single steel plate. A steel hollow made of a substantially box-like body in which the joined portions of the front portion, the rear portion, and the bottom portion are welded and the upper surface portion is fastened with bolts to the lower surface of the joint between the front portion and the upper surface portion with a support plate A tube, a substantially annular reinforcing rib fixed inside the hollow steel tube, and an elongated portion projecting in the front direction of the hollow steel tube are formed at a substantially central portion of the bottom surface. A substantially rectangular belly plate that is suspended and fixed in series in the vertical direction; a reinforcing rib of the belly plate that is arranged in a substantially right-angled direction at a right angle to the belly plate and arranged at predetermined equal intervals; and the belly plate A flange extension portion fixed and arranged in a front direction of the steel hollow cylinder substantially parallel to the extension portion from the lower end of the steel, and the front Welding each joint of the front part, back part and bottom part formed of a width extension material for road bridges and a single steel plate as an intermediate member composed of a flange provided on the back of the abdomen and the front part A steel hollow cylinder made of a substantially box-like body having a top plate fastened with a support plate to the lower surface of the seam between the upper surface and the upper surface, and a substantially T-shaped support member fixed to the inside of the steel hollow cylinder A work hole perforated in the left and right portions of the bottom portion of the substantially T-shaped support member, a plurality of vehicle protection fence mounting holes formed on the top surface portion, and the steel hollow cylinder A substantially rectangular bell plate fixed in series in the length direction at the approximate center of the bottom portion integrally formed with the extending portion projecting in the front direction, and the periphery in a direction perpendicular to the belly plate is substantially unequal Reinforcing ribs of the belly plate arranged in a square shape at predetermined equal intervals, and the steel substantially parallel to the extending portion from the lower end of the belly plate A plurality of road bridge width extension materials as strut members composed of a flange extending portion fixed and arranged in the front direction of the hollow cylinder and a flange provided on the back surface of the abdomen are loaded into the construction site, 1. Pavement of width necessary for installing the extension part over the entire length of the road bridge is removed from the concrete floor slab, and the existing concrete ground cover on the same surface as the exposed concrete floor slab cutting and / or chipping scribed sake of positions of the bolt holes on the upper and side surfaces of the concrete slab on the basis with the size of the road bridge for width extension member is removed, the bolt holes at the scoring position of the concrete slab puncturing the, to the concrete slab in the second with intervening primed mortar layer, the road bridge for width expansion material temporarily placed in the concrete slab, the upper surface portion removably all bolts and nuts The width expansion material for road bridges is fastened and fixed to the concrete floor slab, and third, the width expansion material for road bridges as the intermediate member in contact with the concrete floor slab and the mortar layer for ground treatment and the road bridge as the support members Sealing is performed with a sealing material on the joint surface formed between the end face of the width expanding material for road use and the adjacent portion of the width expanding material for road bridge as the intermediate member and the width expanding material for road bridge as the support member. Resin is injected and filled in the gap formed between the floor slab and the lower surface of the extending portion, the front surface of the abdomen and the upper surface of the flange extending portion, and the upper surface portion is fixed to a road bridge width expanding material, 4. The seam between the upper surface portion and the front surface portion, the abutting portion between the upper surface portion and the rear surface portion, and the joint are sealed with the seal material, and the vehicle protection fence mounting hole of the road bridge width expansion material is protected with the vehicle. Fix the fence The concrete on the upper surface of the extended portion or the resin mortar paving and Da設, characterized in that finish the upper surface to an existing pavement flush while.

Since the installation method of the width extension material for road bridges according to the present invention has the above-described configuration and operation, the following effects are obtained.

According to invention of Claim 1, it is the installation method of the width expansion material in a road bridge, Comprising: In the road bridge comprised by the concrete floor slab and the concrete ground cover, it forms with a single steel plate. A steel hollow made of a substantially box-like body in which the joined portions of the front portion, the rear portion, and the bottom portion are welded and the upper surface portion is fastened with bolts to the lower surface of the joint between the front portion and the upper surface portion with a support plate A tube, a substantially annular reinforcing rib fixed inside the hollow steel tube, and an elongated portion projecting in the front direction of the hollow steel tube are formed at a substantially central portion of the bottom surface. A substantially rectangular belly plate that is suspended and fixed in series in the vertical direction; a reinforcing rib of the belly plate that is arranged in a substantially right-angled direction at a right angle to the belly plate and arranged at predetermined equal intervals; and the belly plate A flange extension portion fixed and arranged in a front direction of the steel hollow cylinder substantially parallel to the extension portion from the lower end of the steel, and the front Welding each joint of the front part, back part and bottom part formed of a width extension material for road bridges and a single steel plate as an intermediate member composed of a flange provided on the back of the abdomen and the front part A steel hollow cylinder made of a substantially box-like body having a top plate fastened with a support plate to the lower surface of the seam between the upper surface and the upper surface, and a substantially T-shaped support member fixed to the inside of the steel hollow cylinder A work hole perforated in the left and right portions of the bottom portion of the substantially T-shaped support member, a plurality of vehicle protection fence mounting holes formed on the top surface portion, and the steel hollow cylinder A substantially rectangular bell plate fixed in series in the length direction at the approximate center of the bottom portion integrally formed with the extending portion projecting in the front direction, and the periphery in a direction perpendicular to the belly plate is substantially unequal Reinforcing ribs of the belly plate arranged in a square shape at predetermined equal intervals, and the steel substantially parallel to the extending portion from the lower end of the belly plate A plurality of road bridge width extension materials as strut members composed of a flange extending portion fixed and arranged in the front direction of the hollow cylinder and a flange provided on the back surface of the abdomen are loaded into the construction site, 1. Pavement of width necessary for installing the extension part over the entire length of the road bridge is removed from the concrete floor slab, and the existing concrete ground cover on the same surface as the exposed concrete floor slab cutting and / or chipping scribed sake of positions of the bolt holes on the upper and side surfaces of the concrete slab on the basis with the size of the road bridge for width extension member is removed, the bolt holes at the scoring position of the concrete slab puncturing the, to the concrete slab in the second with intervening primed mortar layer, the road bridge for width expansion material temporarily placed in the concrete slab, the upper surface portion removably all bolts and nuts The width expansion material for road bridges is fastened and fixed to the concrete floor slab, and third, the width expansion material for road bridges as the intermediate member in contact with the concrete floor slab and the mortar layer for ground treatment and the road bridge as the support members Sealing is performed with a sealing material on the joint surface formed between the end face of the width expanding material for road use and the adjacent portion of the width expanding material for road bridge as the intermediate member and the width expanding material for road bridge as the support member. Resin is injected and filled in the gap formed between the floor slab and the lower surface of the extending portion, the front surface of the abdomen and the upper surface of the flange extending portion, and the upper surface portion is fixed to a road bridge width expanding material, 4. The seam between the upper surface portion and the front surface portion, the abutting portion between the upper surface portion and the rear surface portion, and the joint are sealed with the seal material, and the vehicle protection fence mounting hole of the road bridge width expansion material is protected with the vehicle. Fix the fence The concrete on the upper surface of the extended portion or the resin mortar paving and Da設 provides an installation method of a road bridge for width expansion material, characterized in that finish the upper surface to an existing pavement flush while.
With such a configuration, the road bridge width expanding material as the intermediate member can withstand a shock load of a vehicle or the like to reduce the weight, and the road bridge width expanding material as the support member is used for vehicle protection. Since the fences and other components have a solid structure that can withstand a collision load from a vehicle, etc., the width expansion material for road bridges has been unitized, so the total weight of the width expansion materials for road bridges in the entire road bridge can be reduced. Yes, by setting the length of each of the road bridge width extension materials to be relatively short, for example, 1 (m), the width extension material for the road bridge is installed along the horizontal level, that is, the inclination of the existing concrete floor slab. As a result, the gap between the concrete floor slab and the road bridge width expanding material can be reduced, and the amount of material, for example, epoxy resin filling the gap can be reduced. In an effect that is obtained sufficient construction strength with workability is improved. Also, an installation method in which an epoxy resin is injected and filled into a gap formed between the lower surface of the extending portion of the concrete floor slab and the width extension material for the road bridge, the front surface of the abdomen, and the upper surface of the flange extending portion. Therefore, when a collision load due to a vehicle or the like acts on the width expansion material for the road bridge, since the impact load from the width expansion material for the road bridge to the concrete floor slab acts on the entire bonding surface, It is possible to prevent the load from being concentrated around the fastening part of the fastening member such as a bolt, and to effectively prevent the destruction and fracture of the concrete slab at the fastening part. Furthermore, since the flange extension part was provided and the reinforcing ribs required on the extension part in the prior art were abolished, the extension part to be carried out as restoration work after installing the road bridge width extension material on the concrete slab The thickness of concrete or resin mortar pavement can be adjusted freely, and it can be finished with the same or low level as existing asphalt pavement, etc. There is an effect that it can be paved and constructed.

It is the width expansion material for road bridges concerning this invention, Comprising: It is a front view which shows embodiment which shows the state which installed two types of width expansion materials for road bridges which have predetermined length through a joint (gap) is there. It is a bottom view of FIG. It shows an example of embodiment of the installation method of the width expansion material for road bridges concerning this invention seen from the arrow AA line direction of FIG. 1, Comprising: It is the inside of a ground cover, ie, a steel hollow cylinder. It is a vertical expanded sectional view which shows the width expansion material for road bridges as an intermediate member provided with the substantially ring annular reinforcement rib. It is the perspective view which looked at the width expansion material for road bridges as an intermediate member shown in FIG. 3 from upper direction. It is the perspective view which looked at the width expansion material for road bridges as an intermediate member shown in FIG. 3 from the downward direction. FIG. 4 is a perspective view clearly showing the configuration of a substantially ring-shaped reinforcing rib provided inside the ground cover in the road bridge width expanding material as the intermediate member shown in FIG. 3. FIG. 1 shows an example of an embodiment of a method for installing a width extension material for a road bridge according to the present invention as seen from the direction of the arrow B-B in FIG. It is a vertical expanded sectional view which shows the width expansion material for road bridges as a strut member of the width expansion material for road bridges provided with the substantially T-shaped support member. It is the perspective view which looked at the width extension material for road bridges as a support | pillar member shown in FIG. 7 from upper direction. It is the perspective view seen from the lower part in the width expansion material for road bridges as a support | pillar member shown in FIG. FIG. 8 is a perspective view clearly showing the configuration of a substantially T-shaped support member provided inside the ground cover in the road bridge width expanding material as the support member shown in FIG. 7. It is sectional drawing which shows an example after construction of the widening method of the road bridge in a prior art. It is sectional drawing which shows the other example after construction of the widening method of the road bridge in a prior art.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a method for installing a road bridge width expanding material according to the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 shows an embodiment of a road bridge width expanding material according to the present invention, in which two kinds of road bridge width expanding materials having a predetermined length are installed in series via joints (gap). It is a front view. FIG. 2 is a bottom view of FIG. FIG. 3 shows an example of an embodiment of a method for installing a width extension material for a road bridge according to the present invention as seen from the direction of the arrow AA in FIG. It is a vertical expanded sectional view which shows the width expansion material for road bridges provided with the reinforcement rib. FIG. 4 is a perspective view of the road bridge width expanding material shown in FIG. 3 as viewed from above. FIG. 5 is a perspective view of the road bridge width expanding material shown in FIG. 3 as viewed from below. FIG. 6 is a perspective view clearly showing the configuration of a substantially annular annular reinforcing rib provided inside the ground cover in the road bridge width expanding material shown in FIG. 3.
Hereinafter, based on FIG. 1 thru | or FIG. 6, the structure of the width extension material for road bridges which concerns on this invention is demonstrated first.

FIG. 1 shows a width expansion material for a road bridge as an intermediate member of two types of width expansion materials for a road bridge, that is, a width expansion material for a road bridge as a strut member of the width expansion material for a road bridge. For example, a configuration example is shown in which a series of the gaps are alternately arranged via joints (gap) 10C having a width of about 5 (mm). 10A is a road bridge width expanding material as an intermediate member of the road bridge width expanding material, and is provided with a substantially ring-shaped reinforcing rib 11e without providing a substantially T-shaped support member inside the ground cover 11A. . Reference numeral 10B denotes a road bridge width expanding material as a support member of the road bridge width expanding material, and a substantially T-shaped support member 24 is provided inside the ground cover 11B.

First, the road bridge width expanding material 10A as an intermediate member of the road bridge width expanding material will be described. In FIG. 3, 10A is the installation state of the width expansion material for road bridges as an intermediate member of the width expansion material for road bridges. It is formed as a unit of a desired size in consideration of the above. 11A designates a steel hollow cylinder having a substantially box-like body, ie, a ground cover, of the road bridge width expanding material 10A. From each surface portion of the front surface portion 11a, the upper surface portion 11b, the back surface portion 11c, and the bottom surface portion 11d. It is configured. Each of these surface portions 11a, 11b, 11c, and 11d is a single steel plate, and the joint portion of each surface portion is welded. As shown in FIG. 3, the upper end of the front surface portion 11a is bent smoothly in the back surface direction so that it can be used after construction.

Reference numeral 12 denotes a steel hollow cylindrical body, that is, an extending portion that protrudes in the front direction of the ground cover 11A, and is integrally formed with the bottom surface portion 11d. As shown in FIG. 3, a substantially rectangular bellows that is continuously suspended and fixed in the length direction of the steel hollow cylinder, that is, the ground cover 11A, is provided at the approximate center of the integrally formed member consisting of the extending portion 12 and the bottom surface portion 11d. As shown in FIGS. 1 and 3, the reinforcing ribs 14 of the abdominal plate 13 whose periphery is a substantially unequal square or trapezoidal shape are arranged in a direction perpendicular to the abdominal plate 13 in a predetermined manner. At intervals, for example, as shown in FIG. As shown in FIG. 1, the belly plate 13 surrounded by the reinforcing ribs 14 and 14 of the belly plate 13 has one or two substantially oval bolt holes 13a arranged substantially in the center. Yes. Here, one or two bolt holes 13a, 13a are connected to each surface, but the number of arrangements may be adjusted according to the conditions at the site.

For example, a substantially ring-shaped reinforcing rib 11e is fixed inside the ground cover 11A, and its lateral side shape is substantially a square shape as shown in FIGS. It consists of four sides. The upper part of the four sides of the substantially annular annular reinforcing rib 11e is configured to be in close contact with the inner wall of the upper surface part 11b. The substantially annular annular reinforcing rib 11e is formed in a flat plate shape, and is erected on the upper surface of the bottom surface portion 11d in the vertical direction at predetermined equal intervals, for example, as shown in FIG. For example, a flat plate portion (not shown) is extended from the upper portion of the substantially annular annular reinforcing rib 11e so that the upper surface portion 11b of the ground cover 11A can be easily placed. The substantially ring-shaped reinforcing ribs 11e are mounted on the same surface, for example, with the mounting positions of the reinforcing ribs 14 of the abdominal plate 13 across the bottom surface portion 11d, and the number of installations is the same. A feature of the road bridge width expanding material 10A as an intermediate member of the road bridge width expanding material according to the present invention is that no reinforcing rib is provided on the upper surface of the extending portion 12 of the ground cover 11A.

At the lower end of the belly plate 13, a flange extending portion 15 having a predetermined length is fixed and arranged in the front direction of the ground covering 11A substantially parallel to the extending portion 12 of the ground covering 11A. The stretched portion 12, the stomach plate 13 and the flange stretched portion 15 are formed in a substantially U-shaped side surface as a whole, and an epoxy resin layer 21 and a ground treatment mortar layer are formed on the approximately U-shaped portion. The concrete floor board 18 arrange | positioned on the lower surface of the extending | stretching part 12 through 22 is hold | maintained and fixed. The extending portion 12, the abdominal plate 13, and the flange extending portion 15 are each fixed and arranged as a separate member by welding means, but may be integrally configured by one member.

Except for the upper surface where the ring-shaped reinforcing ribs 11e and 11e are erected on the bottom surface portion 11d, the substantially elliptical or rectangular shape shown in FIG. ) × 150 (mm) work holes 11f are provided, and work for inserting and welding fastening members such as bolts and nuts used for fastening the upper surface portion 11b to the substantially annular annular reinforcing rib 11e is performed. The extending portion 12 is provided with substantially circular or elliptical bolt holes 12a and 12b. Then, the concrete anchor 16 and the anchor bolt 17 are driven into the concrete floor slab 18 through the bolt holes 12a and 12b.
The working hole 11f may be omitted.

Concrete or resin mortar pavement 19 is laid on the upper surface of the extending portion 12. For example, asphalt pavement 20 is laid on the upper surface of the concrete floor slab 18 in front of the concrete or resin mortar pavement 19, that is, adjacent to the right direction in FIG. Further, as described above, an epoxy resin layer 21 having a thickness of, for example, about 5 (mm) is injected into the lower surface of the extending portion 12, the front surface of the abdominal plate 13, and the upper surface of the flange extending portion 15. A grounding mortar layer 22 is interposed on the lower surface of the epoxy resin layer 21, the front surface of the stomach plate 13, and the upper surface of the flange extending portion 15. With this construction, the road bridge width expanding member 10A as an intermediate member is securely fixed to the concrete floor board 18, and a structure that is resistant to impacts is realized, and inflow of rainwater and the like is completely prevented, and the road is highly airtight. The bridge width expanding material 10A can be provided.

With the abdominal plate 13 as a base point, a plate-like abdominal plate flange 23 having a predetermined width is provided on the back surface of the abdominal plate 13 in the opposite direction of the flange extending portion 15, that is, in the rear. As shown in FIG. 5, the flange 23 of the abdomen is fixed at its end by welding means between the lower end of the back surface 11c of the cover 11A and the lower end of the abdomen 13, so that the length of the cover 11A is long. A plurality of, for example, three are provided in the vertical direction. That is, it is interposed between the abdominal plate 13 and the back surface portion 11c of the ground cover 11A. As shown in FIG. 5, the flange 23 of the abdominal plate is fixed to the lower end of each reinforcing rib 14 installed on the lower surface of the bottom surface portion 11d. Accordingly, the number of the flanges 23 of the abdominal plate installed is the same as the number of the reinforcing ribs 14, and the overall side surface shape of both is substantially T-shaped. Since it comprised in this way, the load resistance of 10 A of width expansion materials for road bridges as an intermediate member of the width expansion material for road bridges can be improved, and even when an impact, such as an earthquake and a wheel load, is added to a road, it may be damaged. No need for re-repair and contribute to road safety.

The bottom surface portion 11d, the back surface portion 11c, the abdominal plate 13, the flange extending portion 15 and the abdominal plate flange 23 of the ground cover 11A can be constituted by a single member, omitting welding means and fixing means, Can be shortened. Further, in FIG. 4, 11g is a joint between the upper surface portion 11b and the front surface portion 11a of the ground cover 11A and forms a gap in the length direction. As shown in FIG. 5, the seam 11g fixes the support plate 11h to the lower surface of the upper surface portion 11b with fastening means such as welding means and bolts. Then, the seam 11g is closed.

Next, the width expansion material 10B for road bridges as a column member of the width expansion material for road bridges according to the present invention will be described.
FIG. 7 shows an example of an embodiment of a method for installing a width extension material for a road bridge according to the present invention as seen from the direction of the arrow B-B in FIG. It is a vertical expanded sectional view which shows the width expansion material for road bridges as a support | pillar member of the width expansion material for road bridges provided with the shape support member. FIG. 8 is a perspective view of the road bridge width expanding material shown in FIG. 7 as viewed from above. FIG. 9 is a perspective view of the road bridge width expanding material shown in FIG. 7 as viewed from below. FIG. 10 is a perspective view clearly showing the configuration of a substantially T-shaped support member provided inside the ground cover in the road bridge width expanding material shown in FIG.

In FIG. 7, 10B is the installation state of the width expansion material for road bridges as a support | pillar member of the width expansion material for road bridges based on this invention, Comprising: The said width expansion material for road bridges is manufactured in a factory, It is formed as a unit of a desired size in consideration of conditions and workability. 11B designates a steel hollow cylindrical body that is a substantially box-like body of the width expanding member 10B for road bridges, that is, a ground cover. From each surface portion of the front surface portion 11a, the upper surface portion 11b, the back surface portion 11c, and the bottom surface portion 11d It is configured. Each of these surface portions 11a, 11b, 11c, and 11d is a single steel plate, and the joint portion of each surface portion is welded. As shown in FIG. 8, the upper end of the front surface portion 11a is bent smoothly in the back surface direction so that it can be shared after construction.

Reference numeral 12 denotes a steel hollow cylindrical body, that is, an extending portion projecting in the front direction of the ground cover 11B, and is integrally formed with the bottom surface portion 11d. In the substantially central part of the integrally formed member consisting of the extending portion 12 and the bottom surface portion 11d, that is, the bottom plate portion, as shown in FIG. 7 and FIG. A rectangular belly plate 13 is provided. As shown in FIGS. 9 and 10, the reinforcing ribs 14 of the abdominal plate 13 whose periphery is a substantially unequal square or trapezoidal shape are arranged at predetermined equal intervals in a direction perpendicular to the abdominal plate 13. For example, as shown in FIG. 1, a plurality or a plurality are arranged. As shown in FIG. 1, the belly plate 13 surrounded by the reinforcing ribs 14 and 14 of the belly plate 13 has one or two substantially oval bolt holes 13a arranged substantially in the center. Yes. Here, one or two bolt holes 13a, 13a are connected to each surface, but the number of arrangements may be adjusted according to the conditions at the site.

A substantially T-shaped support member 24 is disposed inside the ground cover 11B, for example, as shown in FIG. Reference numeral 24 denotes a substantially T-shaped support member that is vertically erected in the longitudinal center of the steel hollow cylinder, that is, the ground cover 11B, and includes a front surface portion 11a, a bottom surface portion 11d, and a back surface portion of the ground cover 11B. 11c, and has a flange 24a and a vertical plate portion 24b standing vertically on the lower surface of the flange 24a, and both are welded. The substantially T-shaped support member 24 is attached to the same position in the vertical direction across the bottom portion 11d and the attachment position of the reinforcement rib 14 located in the center of the reinforcement ribs 14 and 14 of the abdominal plate 13, for example. . A feature of the road bridge width expanding material 10B as a support member of the road bridge width expanding material according to the present invention is that no reinforcing rib is provided on the upper surface of the extending portion 12 of the ground cover 11B. The flange 24a has a plurality of holes 24c,... Adapted to a vehicle protection fence mounting hole 11j formed in the upper surface portion 11b of the ground cover 11B, and fastening members such as bolts and nuts from above. Insert the vehicle guard fence 25 through the upper surface portion 11b. Reference numerals 24d and 24d are lower surfaces of the flange 24a, and for example, four flange reinforcing plates that are interposed and fixed between flange reinforcing ribs 24e and 24e that protrude from the left and right side surfaces of the vertical plate portion 24b with an appropriate interval. It is. The flange reinforcing plate 24d enhances the rigidity of the vehicle protection fence 25 fixed to the flange 24a with a fastening member such as a bolt or a nut via the upper surface portion 11b of the ground cover 11B. The flange reinforcing plate 24d prevents the flange 24a from being deformed by a bending moment generated when the vehicle protection fence 25 receives an external force due to a collision of a vehicle or the like.

As shown in FIG. 10, 24e and 24e are flange reinforcing ribs arranged and welded to the left and right side surfaces of the vertical plate portion 24b and both ends of the flat flange reinforcing plates 24d and 24d. Each has two. The flange reinforcing ribs 24e and 24e prevent the flange 24a from being deformed by a bending moment generated when the vehicle guard fence 25 receives an external force such as a collision of the vehicle, and at the same time, deform the vertical plate portion 24b. Can also be prevented.

A flange extending portion 15 having a predetermined length is fixed and disposed at the lower end of the abdomen plate 13 substantially in parallel with the extending portion 12 of the ground cover 11B. The stretched portion 12, the stomach plate 13 and the flange stretched portion 15 are formed in a substantially U-shaped side surface as a whole, and an epoxy resin layer 21 and a ground treatment mortar layer are formed on the approximately U-shaped portion. The concrete floor board 18 arrange | positioned on the lower surface of the extending | stretching part 12 through 22 is hold | maintained and fixed. The extending portion 12, the abdominal plate 13, and the flange extending portion 15 are each fixed and arranged as a separate member by welding means, but may be integrally configured by one member.

A plurality of, for example, two, for example, 100 (mm) × 150 (mm) work holes 11i having a substantially oval or rectangular shape shown in FIG. Insertion work and welding work of fastening members such as bolts and nuts used for fastening with the letter-shaped support member 24 are performed. The working hole 11i is a bottom surface portion of the ground cover 11B, and the left and right portions of the position where the substantially T-shaped support member 24 stands is drilled. Specifically, two holes are drilled as shown in FIG.
The extending portion 12 is provided with substantially circular or elliptical bolt holes 12a and 12b. Then, the concrete anchor 16 and the anchor bolt 17 are driven into the concrete floor slab 18 through the bolt holes 12a and 12b.

Concrete or resin mortar pavement 19 is laid on the upper surface of the extending portion 12. For example, asphalt pavement 20 is laid on the upper surface of the concrete floor slab 18 in front of the concrete or resin mortar pavement 19, that is, adjacent to the left direction in FIG. Further, as described above, for example, the epoxy resin layer 21 having a thickness of about 5 (mm) is injected into the lower surface of the extending portion 12, the front surface of the abdominal plate 13, and the upper surface of the flange extending portion 15. A grounding mortar layer 22 is interposed on the lower surface of the epoxy resin layer 21, the front surface of the stomach plate 13, and the upper surface of the flange extending portion 15. Since it is configured in this manner, the road bridge width expanding member 10B as a support member is securely fixed to the concrete floor 18 and a structure resistant to impact is realized, and inflow of rainwater and the like is completely prevented, and the road is highly airtight. The width expansion material 10B for bridges can be provided.

With the abdomen 13 as a base point, that is, on the rear surface of the abdomen 13, a plate-like abdomen flange 23 having a predetermined width is provided in the opposite direction of the flange extending portion 15, that is, in the rear. As shown in FIG. 9, the end of the flange 23 of the abdomen is fixed by welding means or the like between the lower end of the back part 11c of the ground cover 11B and the lower end of the abdomen 13 and has a mutual interval. A plurality, for example, 3 are provided. Then, the flange 23 of the abdomen is fixed to the lower end of each reinforcing rib 14 installed on the lower surface of the bottom surface portion 11d as shown in FIG. Accordingly, the number of the flanges 23 of the abdominal plate installed is the same as the number of the reinforcing ribs 14, and the overall side surface shape of both is substantially T-shaped. Since it comprised in this way, the load resistance of the width expansion material 10B for road bridges as a support | pillar member of the width expansion material for road bridges can be improved, and even when an impact such as an earthquake or a wheel load is applied to the road, damage may occur. No need for re-repair and contribute to road safety.

The bottom surface portion 11d, the back surface portion 11c, the abdominal plate 13, the flange extending portion 15 and the abdominal plate flange 23 of the ground cover 11B can be constituted by one member, omitting welding means and fixing means, and shortening the construction period. Can be realized.

When assembling the above-mentioned road bridge width expanding material according to the present invention on a road bridge, FIG. 1 shows a road bridge width expanding material 10A as an intermediate member and a road bridge width expanding material 10B as a support member. Connect as follows. In FIG. 1, two road bridge width expansion members 10B as strut members are connected in series from the left side, and then a road bridge width expansion material 10A as an intermediate member and the road bridge as the strut member. It is the structure which connected the width expansion material 10B alternately.
The configuration example shown in FIG. 1 is an example, and the road bridge width expanding materials 10A and 10B related to the intermediate member and the support member can be appropriately knitted and combined according to the situation at the site. In addition, it is customary to connect between the width extension members 10A, 10B for both road bridges via joints (gap) 10C having a width of about 5 (mm). The width expansion members 10A and 10B for both road bridges configured by welding and connecting a plurality may be installed on site, and the joint (gap) 10C may be selected as appropriate.

Next, the construction example to the road bridge will be described in detail with respect to the method for installing the width extension material for road bridge according to the present invention.
First, a road bridge width expanding material 10A as a required number of intermediate members and a road bridge width expanding material 10B as a strut member are manufactured in a factory, and each road bridge width expanding material 10A, 10B is manufactured. To the construction site of the road bridge to expand the width.
Then, for example, asphalt pavement 20 having a width dimension necessary for installing the extended portion 12 of the ground cover over the entire length of the road bridge at the shoulder of the road bridge to expand the width is removed from the concrete floor slab 18 with a tool such as a breaker. Remove. Further, on the same surface as the upper surface of the exposed concrete floor slab 18, an existing concrete ground cover (not shown) is cut and / or scraped with a concrete cutter or the like. The chipping means that the upper surface of the concrete slab 18 is thinly cut and removed with the above-mentioned tool or the like. Next, the positions of the bolt holes 12a, 12b, and 13a are marked on the upper and side surfaces of the concrete slab 18 based on the dimensions of the road bridge width expanding members 10A and 10B. At this time, at least four road bridge width expanding members 10B as support members are installed on both side ends of the road bridge, so-called bridge ridges, and for the road bridge as an intermediate member over the length direction of the road bridge. The width expansion material 10A and the width expansion material 10B for a road bridge as a support member are appropriately arranged as shown in FIGS.

Furthermore, holes for bolts 13b, concrete anchors 16 and anchor bolts 17 are drilled using a core drill with a diamond core or the like attached at the marking position of the concrete floor slab 18. Then, the processed surface of the concrete floor slab 18 is cleaned using a high-pressure washing machine or the like. Secondly, when the road bridge width expanding members 10A and 10B are installed on the concrete floor slab 18, the concrete floor slab 18 is uniformly contacted with the lower surface of the extending portion 12, the front surface of the abdomen plate 13, and the upper surface of the flange extending portion 15. For this reason, when the concrete floor slab 18 is uneven, that is, when the unevenness or undulation is significant, the mortar layer 22 for surface treatment is plastered. That is, a mortar or a non-shrink mortar is plastered to an appropriate thickness in a predetermined range of three surfaces of the concrete floor slab 18 facing the three surfaces, and a smooth flat surface is constructed. The road bridge width expanding materials 10A and 10B carried into the construction site from the factory are temporarily placed on the concrete floor slab 18 by the arrangement described above. At this time, all the upper surface portions 11b of the road bridge width expanding members 10A and 10B are removed. Then, the belly plate 13 is fastened and fixed to the concrete floor slab 18 with bolts 13b through the bolt holes 13, and then the extending portion 12 is attached to the concrete floor slab 18 with concrete anchors 16 and anchor bolts 17 through the bolt holes 12a and 12b. Tighten and fix.

Third, concrete slab and the intermediate member as whole by Lumpur eyes land 10C made of a highway bridge for width expansion material as the strut member and highway bridge for width expansion material which primed mortar layer is in contact Seal with material. Then, an epoxy resin is injected and filled into a gap formed between the concrete slab 18 and the lower surface of the extending portion 12, the front surface of the abdomen plate 13, and the upper surface of the flange extending portion 15. Moreover, the upper surface part 11b is bolted and fixed to the width expansion materials 10A and 10B for road bridges. Fourthly, the seam 11g of the upper surface portion 11b and the front surface portion 11a, the butted portion of the upper surface portion 11b and the rear surface portion 11c, and the portion of the joint 10C that has not yet been subjected to the sealing treatment are sealed with the sealing material to cover the ground, that is, the steel. The hollow cylinder made of steel is sealed to prevent rainwater and the like from flowing into and entering the hollow steel cylinder. Then, the vehicle protection fence 25 is fastened and fixed to the vehicle protection fence mounting hole 11j with bolts. As shown in FIG. 3 and FIG. 7, concrete or resin mortar pavement 19 is placed on the upper surface of the extending portion 12 to cover the extending portion 12, the concrete anchor 16 and the anchor bolt 17, and the concrete or resin mortar pavement 19 is covered. The upper surface is finished flush with an existing asphalt pavement 20, for example. Finally, if necessary, the road bridge width expanding materials 10A and 10B are painted to complete the construction.

According to such an installation method, the road bridge width expansion member 10A can be constructed to withstand an impact load of a vehicle or the like to reduce the weight, and the road bridge width expansion member 10B has a vehicle protection fence 25 provided to the vehicle or the like. As a solid structure that can withstand the impact load due to the unitization of the width expansion material for road bridges, there is an effect that the total weight of the width expansion materials 10A, 10B for road bridges in the entire road bridge can be reduced, By setting the length of each of the road bridge width expanding materials 10A and 10B to be relatively short, for example, 1 (m), the width expanding material 10A and 10B for the road bridge along the horizontal level, that is, the inclination of the existing concrete floor slab. Can be installed. As a result, it is possible to reduce gaps between the concrete floor slab 18 and the road bridge width expanding materials 10A and 10B, and to reduce the amount of material, for example, epoxy resin, that fills the gaps. And workability improves and sufficient construction strength is obtained. Moreover, since it is the installation method which inject | pours and fills an epoxy resin in the clearance gap formed between the concrete floor slab 18 and the lower surface of the extending | stretching part 12, the front surface of the abdominal board 13, and the upper surface of the flange extending part 15, it is a road bridge. When a collision load due to a vehicle or the like acts on the width expanding members 10A and 10B, the impact load from the road bridge width expanding materials 10A and 10B to the concrete floor slab 18 is dispersed and acts on the entire bonding surface. The load can be prevented from concentrating around the fastening part of the fastening member, and the breakage and fracture of the concrete slab 18 at the fastening part can be effectively prevented. Further, since the flange extending portion 15 is provided and the reinforcing ribs required on the extending portion 12 in the prior art are eliminated, the road bridge width expanding members 10A and 10B are installed on the concrete floor slab 18. The thickness of the concrete or resin mortar pavement 19 in the extending portion 12 to be restored can be adjusted freely, and can be finished flush with or lower than that of the existing asphalt pavement 20, for example. Pavement and construction can be easily performed with a shoulder shape that flows well.
As shown in FIG. 1 and FIG. 2, the road bridge width expanding material 10A as an intermediate member and the road bridge width expanding material 10B as a support member are alternately arranged. The installation number of the road bridge width expansion material 10A as the intermediate member and the road bridge width expansion material 10B as the support member may be appropriately changed. For example, only the road bridge width expansion material 10A as the intermediate member You may install in the full length of a bridge, and you may install only the width expansion material 10B for road bridges in the full length of a road bridge.

Although the construction procedure of the road bridge width expansion material 10A as the intermediate member and the road bridge width expansion material 10B as the support member has been shown, the construction procedure is not limited to the above procedure, and depends on the situation of the construction site. Of course, it can be changed. Further, the road bridge width expanding material 10A as an intermediate member and the road bridge width expanding material 10B as a strut member are manufactured at a factory and carried alone to the road bridge width expanding site, and then the road bridge width expanding material. Although 10A and 10B are connected and constructed, the road bridge width expansion material 10A as an intermediate member and the road bridge width expansion material 10B as a strut member are connected in advance at the factory in a desired number, for example, one by one. It is possible to shorten the construction period at the construction site by bringing them together into the width expansion site of the road bridge.

10A Road Bridge Width Expansion Material 10B as Intermediate Member Road Bridge Width Expansion Material 10C Joint (Gap)
11A Ground cover (steel hollow cylinder)
11B Ground cover (steel hollow cylinder)
11a Front portion 11b Upper surface portion 11c Back surface portion 11d Bottom surface portion 11e Substantially annular reinforcing rib 11f Work hole 11g Seam 11h Support plate 11i Work hole 11j Mounting hole 12 such as vehicle protection fence Extending portion 12a Bolt hole 12b Bolt hole 13 Abdominal plate 13a Bolt hole 13b Bolt 14 Reinforcing rib 15 Flange extension 16 Concrete anchor 17 Anchor bolt 18 Concrete floor slab 19 Concrete or resin mortar pavement 20 Asphalt pavement 21 Epoxy resin layer 22 Grounding mortar layer 23 Abdominal plate flange 24 Roughly T-shaped Support member 24a flange 24b vertical plate portion 24c hole 24d flange reinforcement plate 24e flange reinforcement rib 25 vehicle guard fence 26 road shoulder

Claims (1)

A method for installing a width extension material in a road bridge, which is a road bridge composed of a concrete floor slab and a concrete cover. A steel hollow cylinder having a substantially box-like body in which the upper surface portion is fastened with a support plate to the lower surface of the joint between the front surface portion and the upper surface portion, and the steel hollow cylinder body. A substantially rectangular ring-shaped reinforcing rib fixed inside, and a substantially rectangular shape that is suspended and fixed in series in the length direction substantially at the center of the bottom portion integrally formed with the extending portion projecting in the front direction of the steel hollow cylindrical body The abdominal plate, a reinforcing rib of the abdominal plate that is arranged at a predetermined equal interval in a direction perpendicular to the abdominal plate, and substantially parallel to the extending portion from the lower end of the abdominal plate And a flange extending portion fixed and disposed in the front direction of the steel hollow cylinder, and a flange provided on the back surface of the abdomen plate Welding each joint part of the front part, back part and bottom part formed of a width extension material for road bridges and a single steel plate as an intermediate member formed on the lower surface of the joint between the front part and the top part A steel hollow cylinder formed of a substantially box-like body whose upper surface is fastened with a bolt with a support plate, a substantially T-shaped support member fixed inside the steel hollow cylinder, and the bottom surface substantially Working holes drilled in the left and right parts of the T-shaped support member, a plurality of vehicle guard fence mounting holes formed on the upper surface, and an extending portion projecting in the front direction of the steel hollow cylinder A substantially rectangular bell plate fixed in series in the length direction at the approximate center of the bottom portion formed integrally with the base plate, and a line with a substantially unequal quadrangle in the direction perpendicular to the abdominal plate and arranged at predetermined equal intervals. The reinforcing rib of the belly plate, and fixed in the front direction of the steel hollow cylinder from the lower end of the belly plate substantially parallel to the extending portion A plurality of road bridge width extension materials as strut members composed of a flange extending portion provided and a flange provided on the back surface of the abdomen are brought into the construction site, and firstly the extension over the entire length of the road bridge The pavement having a width dimension necessary for installing the section is removed from the concrete slab, and the existing concrete ground cover is cut and / or debris in the same plane as the upper surface of the exposed concrete slab. Based on the dimensions of the width expansion material for road bridges, the positions of bolt holes are marked on the upper and side surfaces of the concrete floor slab, and the bolt holes are drilled at the marking position of the concrete floor slab. Second, the concrete floor Temporarily placing the road bridge width expanding material on a concrete floor slab with a ground treatment mortar layer interposed in the plate, removing all the upper surface portion, and using the bolts and nuts , the road bridge width expanding material Are fixed to the concrete floor slab, and thirdly, the end face of the road bridge width expanding material as the intermediate member and the road bridge width expanding material as the strut member, which are in contact with the concrete floor slab and the ground treatment mortar layer, and The joint formed on the adjacent portion of the road bridge width expanding material as the intermediate member and the road bridge width expanding material as the support member is sealed with a sealing material, and the concrete floor slab and the lower surface of the extending portion Injecting and filling resin into a gap formed between the front surface of the abdomen and the upper surface of the flange extending portion, fixing the upper surface portion to a road bridge width expanding material, and fourth, the upper surface portion and the front surface And a joint portion of the upper surface portion and the back surface portion and the joint are sealed with the sealing material, and the vehicle protection fence is fixed to the vehicle protection fence mounting hole of the road bridge width expansion material and the extending portion Top surface of Installation of road bridges for width expansion material, characterized in that to finish the concrete or the resin mortar paved its upper surface to an existing pavement flush with Da設.

Images