JP2019031838A - Waterproof drainage structure for road bridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waterproof drainage structure of a road bridge capable of smoothly removing rainwater permeating into an asphalt pavement layer without retaining it for a long period of time. SOLUTION: In a road bridge 50 including a concrete deck 11, a concrete wall balustrade 14, and an asphalt pavement layer 12, and a waterproof layer 13 is disposed between the asphalt pavement layer 12 and the concrete deck 11. , A waterproof drainage structure for removing rainwater that has poured onto the road surface, and penetrates the joint portion 15a of the ground covering portion 15 of the concrete wall railing 14 with the concrete deck 11 along the cross slope of the road bridge 50. Crossing direction water paths 17 are formed at a plurality of locations in the extension direction X of the road bridge 50. The bottom surface portion 17a of the water path 17 in the transverse direction crosses the joint portion 15a of the ground cover portion 15 with the concrete deck 11 and extends beyond the inner wall surface 15b of the ground cover portion 15 to the outer wall surface 15c. , It is covered by the outer extension portion 13a of the waterproof layer 13. [Selection diagram] Fig. 2

Description

  The present invention relates to a waterproof drainage structure for a road bridge, and in particular, includes a concrete floor slab, a concrete wall rail, and an asphalt pavement layer, and the waterproof layer is disposed between the asphalt pavement layer and the concrete floor slab. The present invention relates to a waterproof drainage structure of a road bridge to eliminate rainwater that has poured onto the road bridge.

  For example, road bridges such as viaducts on expressways form road surfaces on which vehicles run by laying an asphalt pavement layer on concrete floor slabs made of cast-in-place concrete or precast concrete supported by bridge girders. In the width direction (transverse direction) side edge portion of the road bridge, the driver's line of sight of the traveling vehicle is mainly guided along the side edge portion. A concrete wall rail for preventing the vehicle from deviating to the outside is continuously installed in the longitudinal direction which is the extending direction of the road bridge.

  Also, in such a road bridge, a waterproof layer should be provided between the concrete floor slab and the asphalt pavement layer so that the concrete floor slab will not be deteriorated by the influence of rain water that has been poured in rainy weather. Even if rainwater that has poured onto the road surface penetrates into the interior of the asphalt pavement layer, for example, through the boundary between the pavement layer itself, the pavement joints, and the ground cover of the concrete wall railings, In addition, it has been devised not to reach the concrete floor slab, and has been devised to exclude permeated rainwater to the outside of the road bridge so that it does not stay on the waterproof layer for a long time (for example, Patent Document 1, Non-Patent Document 1).

  That is, in the conventional waterproof drainage structure of a road bridge that prevents rainwater that has poured onto the road surface from reaching the concrete slab and that can remove rainwater that has penetrated the asphalt pavement layer, for example, as shown in FIG. In addition, the end portion in the width direction of the waterproof layer 13 ′ laid along the drainage gradient (transverse gradient) of the road bridge 10 ′ is a ground covering portion 15 ′ of the wall rail 14 ′ standing from the concrete floor slab 11 ′. To prevent the infiltrated rainwater from reaching the concrete slab 11 ', and the infiltrated rainwater stays in the vicinity of the ground cover 15' at the downstream end of the drainage gradient (transverse gradient). The rainwater that has been retained is allowed to flow down in the longitudinal direction along the ground cover 15 ′, and is installed at a predetermined interval in the extending direction (longitudinal direction) of the road bridge and the concrete wall rail. Layer 13 'and concrete From 'Multiple drainage pipe 20 for draining penetrating the' plate 11, so as to eliminate under the road bridge 50 '.

JP 2005-171730 A

October 2016, published by Japan Society of Civil Engineers, "Road Bridge Floor Waterproof System Guidelines 2016 Steel Structure Series 28", P34

  However, in the waterproof drainage structure 10 ′ for the conventional road bridge shown in FIG. 6, the rainwater retained in the vicinity of the ground cover portion 15 ′ has a gentle slope in the longitudinal direction of the road bridge 50 ′ and is difficult to flow down. It is difficult to drain the rainwater from the drain pipe 20 'and remove it smoothly. In order to drain the rainwater retained in the vicinity of the ground cover portion 15 ′ and smoothly remove it, the number of drain pipes 20 ′ arranged at intervals in the longitudinal direction of the road bridge 10 ′ Although it is conceivable to increase the number of drain pipes 20 ', since the drain pipes 20' are provided through the concrete floor slab 11 ', the concrete floor that receives an alternating load by the traveling vehicle. There is a possibility that it may be a weak point in the structure of the plate, and a lot of work is required for drilling and installing the drain pipe 20 ', and maintenance is also expensive.

  Further, in the waterproof drainage structure of the conventional road bridge shown in FIG. 6, since the infiltrated rainwater is likely to stay in the vicinity of the ground cover portion 15 ′ for a long time, the asphalt pavement layer 12 ′ and the waterproofing layer are waterproofed by asphalt hydrolysis. In the summer when the rainwater staying at a high temperature becomes insufficient due to insufficient adhesion to the layer 13 ', the asphalt pavement layer 12' and the waterproof layer 13 'are easily peeled off, for example, every time rainwater permeates. As a result, the asphalt pavement layer 12 ′ is easily damaged due to the occurrence of potholes, cracks in the road surface, graveling of the base layer 12a ′ of the asphalt pavement layer 12 ′, and the like.

  The present invention can prevent rainwater permeating the asphalt pavement layer from reaching the concrete floor slab with a simple configuration, and can smoothly prevent the rainwater permeating the asphalt pavement layer from staying for a long period of time. The object is to provide a waterproof drainage structure for road bridges that can be eliminated.

  The present invention includes a concrete floor slab, a concrete wall rail installed along a side edge portion of the concrete floor slab, and an asphalt pavement layer laid on the upper surface of the concrete floor slab, the asphalt pavement layer, A road bridge provided with a waterproof layer interposed between the concrete floor slabs, and a waterproof drainage structure for a road bridge provided to eliminate rainwater poured on the road surface. A transverse waterway for drainage that penetrates the joint of the ground cover with the side edge portion of the concrete slab along the crossing slope of the road bridge is spaced in the extending direction of the concrete wall rail. It is formed at a plurality of locations, and the bottom surface of the transverse waterway crosses the joint portion of the ground cover portion with the side edge portion of the concrete floor slab and exceeds the inner wall surface of the ground cover portion. Outside It was extended up to the surface by providing a waterproof drainage structure of a road bridge which is covered by the outer extended portion of the waterproof layer is obtained by achieving the above object.

  And as for the waterproof drainage structure of the road bridge of this invention, it is preferable that the side part of the both sides of the said cross direction waterway is covered with the water stop frame material.

  Moreover, in the waterproof drainage structure for a road bridge according to the present invention, it is preferable that a penetrating pipe for seepage water drainage is installed in the transverse water path.

  Furthermore, in the waterproof drainage structure for a road bridge according to the present invention, the waterproof layer is joined to a side edge portion of the concrete floor slab of the ground covering portion in a portion between each pair of adjacent water grooves in the adjacent direction. A longitudinal water channel whose bottom surface is covered with the waterproof layer is communicated with the transverse water channel along the lower end portion of the inner wall surface of the ground covering portion. It is preferable to be formed.

  Furthermore, in the waterproof drainage structure for a road bridge according to the present invention, a side surface portion of the waterway in the longitudinal direction along the joint portion with the side edge portion of the concrete floor slab of the ground covering portion is formed by a waterstop frame material. Preferably it is covered.

  In the waterproof drainage structure for a road bridge according to the present invention, it is preferable that a permeated water drainage conduit be installed in the longitudinal direction waterway.

  Furthermore, in the waterproof drainage structure of the road bridge of the present invention, the concrete wall rail is installed by arranging a plurality of unit wall rails made of precast concrete in the extending direction through the joint portion, It is preferable that the transverse water path is formed at a joint portion of the ground covering portion with a side edge portion of the concrete floor slab in a portion directly below the joint portion.

  Furthermore, in the waterproof drainage structure for a road bridge according to the present invention, the concrete floor slab is preferably provided by arranging a plurality of unit floor slabs made of precast concrete vertically and horizontally.

  Further, the waterproof drainage structure of the road bridge of the present invention is supported by the outer wall surface of the concrete wall rail, and is caused to collide with rainwater discharged from the discharge opening at the downstream end of the transverse waterway. It is preferable that an anti-scattering member that is allowed to flow downward is attached.

  According to the waterproof drainage structure of the road bridge of the present invention, it is possible to prevent rainwater that has penetrated into the asphalt pavement layer or the concrete floor slab with a simple configuration, and rainwater that has penetrated into the asphalt pavement layer, It can be eliminated smoothly without staying for a long time.

It is a partial fracture outline perspective view which illustrates a road bridge provided with a waterproof drainage function by a waterproof drainage structure of a road bridge concerning a preferred embodiment of the present invention. FIG. 4 is a schematic cross-sectional view taken along the line AA of FIG. 3 for explaining a waterproof drainage structure for a road bridge according to a preferred embodiment of the present invention. FIG. 5 is a schematic plan cross-sectional view taken along the line BB in FIG. 4, illustrating a waterproof drainage structure for a road bridge according to a preferred embodiment of the present invention. FIG. 4 is a schematic cross-sectional view taken along the line CC of FIG. 3 for explaining a waterproof drainage structure for a road bridge according to a preferred embodiment of the present invention. It is a schematic fragmentary sectional view along DD of Drawing 3 explaining a waterproof drainage structure of a road bridge concerning one desirable embodiment of the present invention. It is a schematic cross-sectional view illustrating a waterproof drainage structure of a conventional road bridge.

  A waterproof drainage structure 10 (see FIG. 2) for a road bridge according to a preferred embodiment of the present invention is an existing structure that has deteriorated, for example, in repair work accompanying the aging of the road bridge 50 by a steel girder slab bridge shown in FIG. When a concrete floor slab made of cast-in-place reinforced concrete (RC concrete) is preferably replaced with a concrete floor slab 11 made of precast concrete (PC concrete), the asphalt pavement layer 12 laid on the upper surface of the concrete floor slab 11 In the meantime, by disposing the waterproof layer 13 therebetween, the rain water poured on the road surface of the road bridge 50 does not reach the concrete floor slab 11 even if it penetrates the asphalt pavement layer 12. In order to smoothly remove rainwater that has penetrated into the asphalt pavement layer 12, the concrete floor slab 11 and asphalt Preparative pavement layer 12 and is provided as a structure for preventing or degraded or damaged over an extended period of time.

  That is, when rainwater poured on the road surface of the road bridge 50 penetrates the joints of the asphalt pavement layer 12 and the pavement itself and reaches the concrete floor slab 11, it penetrates through cracks and the like generated in the concrete floor slab 11. Rainwater is likely to enter the inside of the concrete, thereby deteriorating the concrete slab 11 at an early stage and impairing its durability, and significantly accelerates fatigue failure of the slab. In order to prevent rainwater from entering and improve the durability of the pavement and floor slab, a waterproof layer 13 is disposed between the concrete floor slab 11 and the asphalt pavement layer 12. In addition, when rainwater that has penetrated into the asphalt pavement layer 12 stays on the waterproof layer 13 for a long period of time, the adhesion between the asphalt pavement layer 12 and the waterproof layer 13 becomes insufficient due to, for example, hydrolysis of asphalt, and particularly stays. In the summer when rainwater becomes hot, hydrolysis is promoted and the asphalt pavement layer 12 and the waterproof layer 13 are easy to peel off, and the peeling spreads every time rainwater permeates, thereby causing potholes, cracks on the road surface, asphalt Graveling of the base layer 12a of the pavement layer 12 occurs and the asphalt pavement layer 12 is easily damaged.

  For this reason, in the conventional road bridge, for example, as shown in FIG. 6, the end in the width direction of the waterproof layer 13 ′ laid along the drainage gradient (transverse gradient) of the concrete slab 11 ′, The rainwater that rises along the ground cover 15 'of the wall rail 14' and penetrates into the asphalt pavement layer 12 'is waterproofed near the ground cover 15' at the downstream end of the drainage gradient (transverse slope). The rainwater staying on the layer 13 'is allowed to flow in the longitudinal direction along the ground cover 15', and predetermined in the longitudinal direction, which is the extending direction of the road bridge 10 'and the concrete wall rail 14'. The plurality of drainage drain pipes 20 ′ penetrating the waterproof layer 13 ′ and the concrete floor slab 11 ′ provided at intervals of the distance are excluded below the road bridge 10 ′. However, as described above, since the number of drain pipes 20 'is limited in terms of the strength of the concrete floor slab 11', labor and maintenance costs, a small number of drain pipes 20 are required. 'So it was difficult to remove rainwater promptly. Therefore, in the conventional waterproof drainage structure 10 ′, the drainage effect by the drain pipes 20 ′ scattered along the ground cover 15 ′ is not sufficiently exhibited, and the ground cover 15 ′ of the wall column 14 ′ Since the rainwater that has permeated stays on the nearby waterproof layer 13 'for a long period of time, the asphalt pavement layer 12' and the waterproof layer 13 'are not sufficiently bonded due to hydrolysis of the asphalt, as described above. In the present situation, potholes, cracks on the road surface, graveling of the base layer 12a ′ of the asphalt pavement layer 12 ′ are likely to occur.

  The waterproof drainage structure 10 for a road bridge according to the present embodiment has been made in order to solve the technical problems caused by the conventional waterproof drainage structure 10 'as described above. As shown in FIG. Asphalt pavement layer 12 has a simple and inexpensive structure using a drainage gradient (transverse gradient) and a waterproof layer 13 disposed between concrete floor slab 11 and asphalt pavement layer 12. Rainwater that has penetrated into the road can be smoothly removed outside the road bridge 50 without staying for a long time.

  And the waterproof drainage structure 10 of the road bridge of this embodiment is laid on the concrete floor slab 11, the concrete wall rail 14 installed along the side edge portion 11 a of the concrete floor slab 11, and the upper surface of the concrete floor slab 11. In order to eliminate rainwater that has poured onto the road surface in a road bridge 50 that includes an asphalt pavement layer 12 and a waterproof layer 13 is interposed between the asphalt pavement layer 12 and the concrete floor slab 11. 2 and FIG. 3, the joint 15 a of the ground cover 15 of the concrete wall rail 14 and the side edge portion 11 a of the concrete floor slab 11 is crossed by the road bridge 50. A transverse waterway 17 for drainage penetrating along the gradient is spaced in the extending direction X (see FIG. 1) of the concrete wall rail 13 which is also the extending direction of the road bridge 50. The bottom surface portion 17a of the transverse waterway 17 is formed at a plurality of locations, and crosses the joint portion 15a of the ground covering portion 15 with the side edge portion 11a of the concrete floor slab 11 so as to cross the inner wall surface of the ground covering portion 15. It is covered with an outer extension portion 13a of the waterproof layer 13 that extends beyond 15b to reach the outer wall surface 15c.

  Moreover, in this embodiment, as shown in FIGS. 3 and 5, in the waterproof drainage structure 10 for a road bridge, the side portions 17 b on both sides of the transverse water channel 17 are covered with the water stop frame material 19.

  Furthermore, in this embodiment, as shown in FIG.3 and FIG.4, in the part between each pair of adjacent transverse waterways 17, the waterproof layer 13 is a side edge of the concrete floor slab 11 of the ground covering part 15. FIG. A longitudinal direction water channel 18 is arranged so as to bite into the joint portion 15a with the portion 11a, and the bottom surface portion 18a is covered with the waterproof layer 13 along the lower end portion of the inner wall surface 15b of the ground covering portion 15. (Refer to FIG. 4), and formed in communication with the transverse waterway 17 (see FIG. 3). A side surface portion 18 b along the joint portion 15 a of the longitudinal direction water channel 18 with the side edge portion 11 a of the concrete floor slab 11 of the ground covering portion 15 is preferably covered with a water-stop frame material 19.

  In this embodiment, the road bridge 50 provided with the waterproof drainage structure 10 is a road bridge made of a steel girder floor slab bridge as shown in FIG. That is, the road bridge 50 is constructed by supporting both ends of a bridge pier 51 made of reinforced concrete, preferably a plurality of I-shaped steel bridge girder 52 extending in parallel, and an upper surface flange portion 52a of the bridge girder 52 erected. The concrete floor slab 11 is provided so as to be supported by the slab. In the present embodiment, as described above, in the renovation work accompanying the aging of the road bridge, for example, after the concrete floor slab made of deteriorated RC concrete is removed together with the existing concrete wall railing etc., the upper surface of the bridge girder 52 is removed. The waterproof drainage structure 10 of the present invention is provided when the road deck 50 is repaired by re-installing the concrete floor slab 11 made of PC concrete.

  Here, the concrete floor slab 11 provided on the upper surface of the bridge girder 52 is a floor slab made of PC concrete, so that construction on the site is facilitated, and the upper surface of the concrete floor slab 11 has a drainage gradient in the transverse direction. With the (transverse gradient) provided, it can be formed accurately and flatly. As a result, it is possible to allow the permeated rainwater to flow down in the transverse direction of the road bridge 50 along the surface of the waterproof layer 13 laid on the upper surface of the concrete floor slab 11 and to lay on the upper surface of the concrete floor slab 11. It becomes possible to ensure strong adhesion between the waterproof layer 13 and the waterproof layer 13 to be waterproofed due to, for example, water vapor from the concrete floor slab 11 due to poor adhesion between the concrete floor slab 11 and the waterproof layer 13. It is possible to effectively avoid the occurrence of a blistering phenomenon, which is a phenomenon in which the layer 13 is lifted together with the asphalt pavement layer 12.

  The concrete floor slab 11 made of PC concrete is formed by, for example, a unit floor slab made of PC concrete having a rectangular plane shape, for example, which has been formed in advance at a factory or the like, arranged vertically on the upper surface of the bridge girder 52 by a known method. In addition to installing and arranging the unit floor slabs as a unit using a known connecting jig, the unit floor slabs can be easily provided while being supported by the bridge girder 52.

  In this embodiment, the concrete wall height column 14 re-installed on the side edge portion 11a of the concrete slab 11 is a road wall 50 and the concrete wall height column 14 with the unit wall height column 14a made of PC concrete interposed by the joint portion 14b. It is comprised by arranging and arranging two or more in the extending direction X. As a result, for example, in a factory, each unit wall height column 14a can be formed with high accuracy, so that it is possible to provide a concrete wall height column 14 of excellent quality and to facilitate construction on site.

  Moreover, in the concrete wall height column 14 by the several unit wall height column 14a made from PC concrete, when installing each unit wall height column 14a along the side edge part 11a of the concrete floor slab 11, it shows in FIG.2 and FIG.4. Thus, between the bottom surface portion 14c and the concrete floor slab 11, for example, a gap 14d is held for height adjustment of about 20 mm, and each unit wall height column 14a is installed, and the held gap 14d includes For example, when the non-shrink mortar 21 is filled and solidified, the ground cover portion 15 of the concrete wall rail 14 is joined to the side edge portion 11a of the concrete floor slab 11 so as to fill the gap 14d. Fifteen joint portions 15a are formed. The non-shrink mortar 21 is surrounded by the backup material 22 using a rectangular frame-shaped backup material 22 (see FIG. 3) installed in the held gap 14d as a mold for preventing outflow. The inner part is filled.

  The backup material 22 has, for example, a rectangular cross-sectional shape with a vertical and horizontal width of about 20 mm. For example, a bar-shaped member made of, for example, chloroprene rubber sponge or the like is assembled in a frame shape, thereby forming the shape of the horizontally long rectangular bottom surface portion 14c of the unit wall column 14a It is formed so as to have a rectangular frame shape having substantially the same shape and size. The backup material 22 is disposed at the attachment position of each unit wall height column 14a along the side edge portion 11a of the concrete floor slab 11, and functions as a leveling material for adjusting the height when the unit wall height column 14a is installed. It also has. As will be described later, the backup material 22 is formed by using a rod-shaped member having a water-stopping property or a water-impervious property, so that the portion of the backup material 22 disposed along the transverse water channel 17 or the longitudinal water channel 18 is The side walls 17b and 18b of the water channels 17 and 18 function as a water-stop frame material 19 that stops water.

  In the present embodiment, the concrete wall height column is used by using the height adjusting gap 14d held between the concrete floor slab 11 when installing the plurality of unit wall height columns 14a constituting the concrete wall height column 14. It is possible to easily form the transverse water channel 17 that penetrates the joint portion 15 a of the 14 ground covering portions 15 with the concrete floor slab 11. In the present embodiment, the concrete wall height column 14a is formed by using the gap 14d in the portion immediately below the joint portion 14b between each pair of adjacent unit wall height columns 14a of the plurality of unit wall height columns 14a constituting the concrete wall height column 14. A transverse water channel 17 is provided that penetrates the joint 15a of the ground cover 15 with the concrete floor slab 11.

  In the present embodiment, a plurality of PC concrete unit floor slabs are arranged vertically and horizontally on the upper surface of the bridge girder 52, and when the concrete floor slab 11 is installed, preferably the concrete wall rail 14 is attached or the asphalt pavement layer is installed. Prior to forming 12, a waterproof layer 13 is laid on the upper surface of the concrete slab 11. The waterproof layer 13 may be formed using various waterproof materials, such as a sheet-based waterproof material, a coating-based waterproof material, and a pavement-based waterproof material, which are conventionally known as members that form the waterproof layer of the road bridge 50. it can. As a waterproof material using a sheet waterproof material, for example, an asphalt waterproof sheet or a synthetic rubber waterproof sheet can be used. As a waterproof material using a coating film-based waterproof material, for example, a rubber-based solvent-type waterproof material, an asphalt-based heat-resistant waterproof material, a resin-based curable waterproof material, and the like can be used. As a waterproof material by a coating-system waterproof material, what is used as a waterproof layer can be used, for example, by forming a waterproof film by repeatedly coating on an adhesive layer. As a waterproof material by a pavement-type waterproof material, what is used as the waterproof layer 13 can be used by, for example, constructing an asphalt mixture called sheet asphalt with a pavement thickness of about 15 to 25 mm. For example, the waterproof layer 13 can be formed by laying fiber reinforced cement boards having a thickness of about 2 to 15 mm vertically and horizontally. In the present embodiment, as a waterproof material for forming the waterproof layer 13, for example, a laminate in which an adhesive layer for bonding to the asphalt pavement layer 12 or the concrete floor slab 11 is laminated on the upper surface and the lower surface of a synthetic rubber-based waterproof sheet is preferable. Can be used.

  The waterproof layer 13 is laid from the center portion of the road bridge 50 toward the side edge portions 11a on both sides while being bonded to the upper surface of the concrete floor slab 11 through an adhesive layer. In the edge portion 11a, the non-shrink mortar 21 filled inside the back-up material 22 is laid to a position where it bites into the joint portion 15a of the ground covering portion 15 of the concrete wall rail 14 with the concrete floor slab 11 (FIG. 3, see FIG.

  Further, the waterproof layer 13 extends from the portion that bites into the joint portion 15a of the ground covering portion 15 of the concrete wall rail 14 to the concrete floor slab 11, and further extends outward in the transverse direction of the road bridge 50. have. The outer extension portion 13a is formed to have a width wider than the lateral width of the transverse waterway 17 (see FIG. 5). The outer extension portion 13a is formed in a region directly below the joint portion 14b between each pair of adjacent unit wall height columns 14a provided with the transverse water channel 17, and is provided on the ground cover portion 15 of the concrete wall height column 14 to be installed. It extends and lays over the position where the inner wall surface 15b is disposed to reach the edge of the concrete slab 11 where the outer wall surface 15c is disposed (see FIG. 2). ).

  When the waterproof layer 13 is laid on the upper surface of the concrete floor slab 11, the concrete wall height column 14 is installed along the side edge portion 11 a of the concrete floor slab 11. As described above, the concrete wall height column 14 includes a plurality of unit wall height columns 14a made of PC concrete formed in advance in a factory or the like in the extending direction X of the concrete wall height column 14 with joint portions 14b interposed therebetween. Can be installed. As described above, the plurality of unit wall height columns 14a made of PC concrete are installed on the backup material 22 after the rectangular frame-shaped backup material 22 for height adjustment is installed at the respective arrangement positions. It is placed and disposed on the side edge portion 11 a of the concrete floor slab 11. The plurality of unit wall height columns 14a arranged are fastened through the ground cover 15 of the concrete wall height column 14 and the concrete floor slab 11 by the unit wall height column 14a and fastened by a known method. The tension bolts 23 (see FIG. 3) are used to firmly fix the side portions 11a of the concrete slab 11 respectively.

  When each unit wall height column 14a is fixed using the high tension bolt 23, the bottom surface of the concrete wall height column 14 inside the backup material 22 from the inlet (not shown) provided in the unit wall height column 14a or the backup material 22 is provided. The non-shrink mortar 21 is injected and filled in the gap 14d between the portion 14c and the concrete slab 11 and solidified, and the joint mortar 24 is filled in the joint portion 14b between each pair of adjacent unit wall rails 14a. Thus, the concrete wall height column 14 is formed by integrating the PC concrete unit wall height columns 14a arranged in series. Further, as shown in FIGS. 5 and 3, the bottom surface portion 17 a is connected to the concrete floor slab 11 of the ground covering portion 15 at a portion immediately below the joint portion 14 b between each pair of adjacent unit wall height columns 14 a. The transverse direction is covered by the outer extension portion 13a of the waterproof layer 13 that extends across the joint portion 15a, and preferably the side portions 17b on both sides are covered by the water-stop frame material 19 by the backup material 22. The water channel 17 is provided in a state of penetrating the joint 15 a with the side edge portion 11 a of the concrete floor slab 11 of the ground cover 15 of the concrete wall rail 14 along the crossing gradient of the road bridge 50.

  Here, in this embodiment, when the joint mortar 24 is filled and solidified in the joint part 14b between each pair of adjacent unit wall height columns 14a, the joint part 14b is formed along the lower end part of the joint part 14b. It is preferable to provide a water-stop frame member 19 ′ that also serves as a spacer. Accordingly, the joint mortar 24 filled in the joint portion 14b can be prevented from being blocked by the transverse water channel 17, and the upper joint mortar 24 is eroded by rain water flowing down the transverse water channel 17. It becomes possible to avoid being to be done.

  Moreover, in this embodiment, it is preferable to install the permeated water drainage conduit 25 in the transverse water path 17. The permeated water drainage conduit 25 is a mesh-shaped conduit that is installed inside the waterway and is provided as a member that can quickly drain rainwater that has penetrated the pavement layer without clogging the waterway. For example, a spring mesh which is a spring-shaped water conduit can be preferably used. More specifically, the trade name “concrete saver” (manufactured by Bridge Maintenance Co., Ltd.) can be used as the permeated water drainage conduit 25. Since the permeated water drainage conduit 25 is installed in the transverse water path 17, it is possible to easily secure a predetermined drainage flow rate without the transverse water path 17 being deformed.

  In this embodiment, the backup material 22 for height adjustment having a rectangular frame shape has a width in the short side direction which is a horizontal width in the transverse direction, for example, is larger than a lateral width in the transverse direction of the bottom surface portion 14c of the unit wall height column 14a. It is formed to be shorter by about 20 mm. As a result, as shown in FIGS. 3 and 4, the concrete floor slab 11 in which one long side portion of the backup material 22 becomes a position where the outer wall surface 15 c of the ground covering portion 15 by the unit wall height column 14 a is disposed. When the backup material 22 is installed on the side edge portion 11a of the concrete slab 11 in a state of being arranged along the edge of the unit wall, the unit wall rail 14a is placed on the installed backup material 22 The unit wall height column 14a has a waterproof layer 13 below the inner edge of the bottom surface portion 14c and a waterproof layer 13 that digs into the joint portion 15a of the ground cover portion 15 of the concrete wall height column 14 and the concrete floor slab 11. For example, a gap having a rectangular cross-sectional shape with a height of around 20 mm and a width of about 20 mm is held in communication with the transverse water channel 17. As will be described later, when the asphalt pavement layer 12 is formed on the waterproof layer 13 laid on the upper surface of the concrete floor slab 11 in the region between the concrete wall height columns 14 on both sides by the unit wall height column 14a, this unit is formed. The longitudinal direction water channel 18 is formed using the gap held below the inner edge of the bottom surface portion 14c of the wall height column 14a. The formed longitudinal direction water path 18 has a state in which the side surface portion 18b along the joint portion 15a with the side edge portion 11a of the concrete floor slab 11 of the ground covering portion 15 is preferably covered with the water-stop frame material 19. It has become.

  In the present embodiment, the asphalt pavement layer 12 laid on the upper surface of the concrete floor slab 11 with the waterproof layer 13 interposed, preferably has a base layer 12a having a thickness of about 50 to 100 mm and a thickness of about 40 to 50 mm. It has a two-layer structure composed of a surface layer 12b, and can be easily formed using various known asphalt composites and paving methods. In particular, with respect to the base layer 12a, the gap between the waterproof layer 13 is reduced as much as possible to reduce the amount of permeated water due to rainwater and to increase the adhesive force with the waterproof layer 13, It is preferable to use a dense asphalt mixture.

  Moreover, in this embodiment, when constructing the asphalt pavement layer 12, for example, a mesh-like partition plate (not shown) is used as a partition form material having water permeability, and the bottom surface portion 14c of the unit wall height column 14a. The above-mentioned gap formed below the inner edge of the wall and the asphalt pavement layer 12 are partitioned so that they are attached to the inner wall surface 15b of the ground covering portion 15 by the unit wall rail 14a. . As a result, when the asphalt pavement layer 12 is constructed, the asphalt mixture flows into the above-described gap below the inner edge of the bottom surface portion 14c of the unit wall height column 14a, and the longitudinal direction water channel 18 is not formed. Can be effectively avoided. In the longitudinal direction water path 18, it is preferable to install a permeated water drainage conduit (not shown) in the same manner as the transverse direction water path 17. As a result, it is possible to easily secure a predetermined drainage flow rate so that the longitudinal direction waterway 17 is not deformed, and it is more effective that the longitudinal direction waterway 18 is clogged by the asphalt mixture. Can be avoided. This also makes it possible to construct the asphalt pavement layer 12 without using a partition formwork such as the mesh-shaped partition plate described above.

  Further, in the present embodiment, as shown in FIG. 2, the discharge of the downstream end of the transverse water channel 17 is supported by the outer wall surface 15c of the ground wall 15 of the concrete wall height column 14 by the unit wall height column 14a. A scattering prevention member 26 is attached, which causes rainwater discharged from the opening 17c to flow downward by colliding. The anti-scattering member 26 can be easily formed by, for example, bending a stainless steel plate or bending it into a bowl shape. The scattering prevention member 26 is easily fixed so as to cover the discharge opening 17 of the waterway 17 in the transverse direction, for example, by fixing the embedding bolt 26a embedded in the outer wall surface 15c of the concrete wall rail 14 with a locking nut. Can be attached. By providing the scattering prevention member 26, even when the amount of rainwater discharged through the transverse waterway 17 and penetrating the asphalt pavement layer 12 increases, the edge of the concrete floor slab 11 is increased. By letting it flow down, it is possible to effectively avoid the discharged rainwater from being scattered to a region away from the road bridge 50. In addition, it is possible to prevent the rainwater from being blown into the transverse waterway 17 by the wind and the reverse flow so that the waterway is always secured.

  According to the waterproof drainage structure 10 for a road bridge of the present embodiment having the above-described configuration, it is possible to prevent rainwater that has penetrated the asphalt pavement layer 12 or the concrete floor slab 11 with a simple configuration. At the same time, the rainwater that has penetrated into the asphalt pavement layer 12 can be smoothly removed without being retained for a long period of time.

  That is, according to this embodiment, the waterproof layer 13 is disposed between the asphalt pavement layer 12 and the concrete floor slab 11, and the concrete floor slab 11 of the ground covering portion 15 of the concrete wall rail 14 is provided. A transverse water channel 17 for drainage that penetrates the joint 15a with the side edge portion 11a along the transverse gradient of the road bridge 50 is formed at a plurality of positions at intervals in the extending direction X of the concrete wall rail 13. The bottom surface portion 17a of the transverse waterway 17 crosses the joint portion 15a with the side edge portion 11a of the concrete floor slab 11 of the ground covering portion 15 and exceeds the inner wall surface 15b of the ground covering portion 15. The outer wall 13c is covered with an outer extension 13a of the waterproof layer 13 that extends to the outer wall 15c.

  Therefore, according to the present embodiment, rainwater that has penetrated into the asphalt pavement layer 12 reaches the concrete floor slab 11 by the waterproof layer 13 disposed between the asphalt pavement layer 12 and the concrete floor slab 11. Can be effectively blocked, and the waterproof layer 13 is used to make the transverse water channel 17 inclined along the crossing gradient of the road bridge 50 and the bottom surface portion 17a of the waterproof layer 13 to the waterproof layer 13. It is possible to easily form the concrete floor slab 11 without providing a through hole in a state covered with the outer extension portion 13a. Moreover, it becomes possible to provide the transverse direction waterway 17 by increasing the number at intervals in the extending direction X of the concrete wall column 13 without providing a through hole in the concrete floor slab 11 and making it a structural weak point. . Thus, according to the present embodiment, it is possible to smoothly remove rainwater that has penetrated into the asphalt pavement layer 12 along the crossing gradient of the road bridge 50 without staying for a long time.

  Further, according to the present embodiment, the side surface portions 17b on both sides of the transverse direction water groove 17 and the side surface portion 18b along the joint portion 15a of the ground covering portion 15 of the longitudinal direction water groove 18 with the concrete floor slab 11 are provided. Since it is covered with the water-stop frame material 19, it is possible to effectively avoid water from penetrating into portions other than the water channel.

  Furthermore, it is possible to estimate the degree of damage to the asphalt pavement layer 12 by measuring the flow rate of rainwater drained from the transverse waterway 17 (a danger signal when the amount of water increases), and prevention of the road bridge 50. It can be used for maintenance and maintenance.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, it is not always necessary to cover the lateral side of the water path in the transverse direction or the lateral side of the water path in the longitudinal direction with a water-stop frame material. It is not always necessary to install a water pipe. The concrete floor slab does not necessarily have to be provided by continuously arranging a plurality of unit floor slabs made of precast concrete, and may be a concrete floor slab made of in-situ concrete. The concrete wall rails do not necessarily have to be installed by arranging a plurality of unit wall rails made of PC concrete, and are concrete wall rails made of on-site concrete or so-called half PC concrete wall rails. Also good.

  When the concrete wall rail is a unit wall rail made of PC concrete, it is necessary to install the waterway in the transverse direction at the joint with the side edge portion of the concrete floor slab of the ground cover part immediately below the joint part. There is not necessarily, and it can also be provided at the junction of the middle part of the unit wall rail. If the concrete wall railing is made of cast-in-place concrete or half PC, for example, in a position where it does not interfere with the reinforcing bar of the ground cover part, a box opening across the joint with the concrete floor slab of the ground cover part is provided, The through-hole formed by this boxing and penetrating along the crossing gradient of the road bridge can be used as a transverse waterway for drainage.

DESCRIPTION OF SYMBOLS 10 Waterproof drainage structure 11 Concrete floor slab 11a Side edge part 12 Asphalt pavement layer 12a Base layer 12b Surface layer 13 Waterproof layer 13a Outer extension part 14 Concrete wall height column 14a Unit wall height column 14b Joint part 14c Bottom part 14d Crevice 15 Ground cover part 15a Concrete floor Joint portion 15b Inner wall surface 15c Outer wall surface 17 Cross direction water channel 17a Bottom surface portion 17b Side surface portion 18 Vertical direction water channel 18a Bottom surface portion 18b Side surface portion 19 Water-stop frame material 21 Non-shrink mortar 22 Backup material 23 High tension bolt 24 Joint mortar 25 Permeated water drainage conduit 26 Splash prevention member 50 Road bridge X Extension direction of road bridge (concrete wall railing)

Claims (9)

A concrete floor slab, a concrete wall rail installed along a side edge portion of the concrete floor slab, and an asphalt pavement layer laid on an upper surface of the concrete floor slab, the asphalt pavement layer and the concrete floor slab In the road bridge in which a waterproof layer is interposed between the road bridge and the waterproof drainage structure of the road bridge provided to eliminate rainwater poured on the road surface,
The direction of the extension of the concrete wall rail is a transverse water channel for drainage that penetrates the joint of the ground cover of the concrete wall rail with the side edge portion of the concrete floor slab along the crossing gradient of the road bridge. Formed at multiple locations at intervals,
The bottom portion of the waterway in the transverse direction extends across the joint portion with the side edge portion of the concrete floor slab of the ground covering portion to reach the outer wall surface beyond the inner wall surface of the ground covering portion. A waterproof drainage structure for a road bridge covered by an outer extension of the waterproof layer.   The waterproof drainage structure for a road bridge according to claim 1, wherein side surfaces on both sides of the transverse waterway are covered with a waterstop frame material.   The waterproof drainage structure for a road bridge according to claim 1 or 2, wherein a water permeation pipe for seepage water drainage is installed in the transverse waterway.   In a portion between each pair of adjacent transverse water channels, the waterproof layer is disposed so as to bite into a joint portion with a side edge portion of the concrete floor slab of the ground covering portion, The longitudinal direction water channel whose bottom surface is covered with the waterproof layer is formed in communication with the transverse direction water channel along the lower end of the inner wall surface of the ground cover. 1. Waterproof drainage structure for road bridges according to item 1.   The waterproof drainage of a road bridge according to claim 4, wherein a side surface portion of the waterway in the longitudinal direction along a joint portion of the ground covering portion with a side edge portion of the concrete floor slab is covered with a waterstop frame material. Construction.   The waterproof drainage structure for a road bridge according to claim 4 or 5, wherein a water permeation pipe for seepage water drainage is installed in the longitudinal direction waterway.   The concrete wall rail is installed by arranging a plurality of unit wall rails made of precast concrete in the extending direction with a joint portion interposed therebetween, and the transverse water path is a portion immediately below the joint portion. The waterproof drainage structure for a road bridge according to any one of claims 1 to 6, wherein the waterproof cover drainage structure is formed at a joint portion between the ground cover portion and a side edge portion of the concrete floor slab.   The waterproof drainage structure for a road bridge according to any one of claims 1 to 7, wherein the concrete floor slab is provided by arranging a plurality of unit floor slabs made of precast concrete vertically and horizontally.   An anti-scattering member is attached to the outer wall surface of the concrete wall rail to allow rainwater discharged from the discharge opening at the downstream end of the transverse waterway to flow downward by colliding. The waterproof drainage structure for a road bridge according to any one of claims 1 to 8.

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