JP7249202B2 - Replacement and repair method for drainage groove forming members and highway bridge drainage grooves - Google Patents

Description

The present invention relates to a drainage ditch forming member provided for draining rainwater from the road surface of a road bridge, and more specifically, a drainage ditch forming member between a ground cover and an asphalt pavement layer and an aged steel drainage ditch are removed and replaced with a new one. It relates to a repair method for replacing a drain.

Drainage of rainwater on bridges is generally carried out by installing drainage basins. However, if the drainage slope of the bridge is low and the drainage basins must be installed closely, a steel drainage ditch with a structure that can be opened and closed is used in the curb of the bridge, and rainwater flows down into it. It's here. Steel drains were thought to have a highly durable structure due to rust prevention treatments such as hot-dip galvanization, but in recent years, deterioration has become apparent, and there are concerns about accidents during vehicle collisions, so urgent measures are required. in a situation of need. It is said that 50% of the 730,000 bridges in Japan that have been built for 50 years will reach 50% in 10 years.

A conventional steel drainage ditch has a configuration as described in Patent Document 1, for example.
The steel drainage groove described in Japanese Patent Application Laid-Open No. 2005-2679 Patent Document 1 is also called a curb with a drainage function, is formed of stainless steel, and as shown in FIG. It has a cover plate 112, an opening/closing hinge 113 for opening and closing the cover plate 112, and a water flow plate 114 for draining collected rainwater. It was fixed with a bolt 116 or the like to the inner wall side of the .

A plurality of oval-shaped water collection holes (not shown) are drilled in the side surface 111a of the support plate 111 to collect the permeated water of the permeable asphalt pavement layer 104, and are embedded in the asphalt pavement layer 104 in a vertical state. rice field. The upper surface 111b of the support plate 111 was arranged horizontally and supported the lower end horizontal portion 112a of the cover plate 112 . The cover plate 112 has a lower horizontal portion 112a which is a horizontal water collecting portion, a vertical water collecting portion 112b rising from this, and a guard portion 112c obliquely extending from the upper end of the vertical water collecting portion 112b toward the road edge. rice field. Also, a plurality of water collecting holes 112d extending from the upper end of the vertical water collecting portion 112b to the central portion of the lower horizontal portion 112a are drilled.

The running water plate 114 has a vertical portion 114a located on the rear side of the side surface 111a of the support plate 111, a running water bottom portion 114b extending horizontally from the lower end of the vertical portion 114a toward the road edge, and a guard extending upward from the end of the vertical portion 114a. It had a rear wall surface portion 114c directed toward the portion 112c. The inside of the running water plate 114 is cleaned by opening the cover plate 112 using the open/close hinge 113 .

However, the conventional steel drainage ditch 101 is generally galvanized, and has the drawback of being corroded by using sodium chloride as a snow-melting agent. there were. In addition, when the earth and sand accumulate in the drain, cleaning requires opening or removing the cover plate 112, which also has the drawback of requiring extra time and cost.

Further, when installing the conventional steel drainage ditch 101, a mortar 105 for height adjustment is required under the flowing water bottom portion 114b of the flowing water plate 114, and the water permeating the permeable asphalt pavement layer 104 is at least There is a problem that water on the surface of the bridge corresponding to the height of the mortar 105 cannot be drained. In addition, since the mortar 105 is generally kneaded, the lower surface of the steel drainage ditch 101 was also soaked with water. There is a risk that this water will enter the concrete through tiny cracks in the floor slabs, cause water leakage, and deteriorate the floor slabs.

As the drain groove forming member, in addition to the steel drain groove as described above, a cylindrical drain groove made of concrete has also been proposed. There was a risk of floor slab deterioration in the same manner as steel drainage ditches.

In addition, in the case of repair work to remove the deteriorated conventional steel drain and replace it with a new drain, if the conventional steel drain or concrete cylindrical drain is replaced, the bottom member for running water will not work. There was a risk that it would not be possible to prevent water from flowing under the floor slabs and prevent deterioration of the floor slabs.

The present invention has been made to solve the above-mentioned problems of conventional drainage groove forming members and road bridge drainage replacement and repair methods, and has durability and prevents water from forming on the lower surface of the bottom member for running water. It is an object of the present invention to provide a drainage ditch forming member capable of blocking and preventing flooding into a concrete floor slab, and a method for replacing and repairing a road bridge ditch.

In addition, while aiming to shorten the construction process, save labor and improve efficiency in construction, which is required for maintenance work that accompanies vehicle regulations, etc., we have realized the certainty and ease of maintenance and management, and the accumulation of sediment in the drainage ditch. To provide a drainage groove forming member which is easy to clean when it is used and which can save time and cost.

In order to solve the above-mentioned problems, the drainage ditch forming member of the present invention is provided between the ground covering portions provided at both ends of the road surface width direction of the concrete floor slab of the road bridge and the asphalt pavement layer laid on the upper surface of the concrete floor slab. In order to drain rainwater from the road surface, a bottom member for running water located below the upper surface of the asphalt pavement layer, a side wall member erected on the side of the ground covering portion of the bottom member for running water, and the asphalt from the side wall member In the drain groove forming member having a cover member provided on the upper surface side of the pavement layer and configured to allow rainwater to flow in, the bottom member for running water is the concrete floor exposed between the ground covering portion and the asphalt pavement layer. A water stop stainless steel plate having an L-shaped cross section having a bottom plate portion to be placed on the slab and a rising portion on the side of the ground covering portion, wherein the side wall member is erected on the concrete floor slab and the outer surface is formed by the rising portion. and a mortar to be filled between the embedded formwork and the ground covering part.

The cross-section of the water passage for draining rainwater from the road surface is formed by placing a stainless steel plate with a thickness of 1 mm or less on the concrete floor slab in an L shape to form a space between the asphalt part and the bottom member for running water and the asphalt pavement layer. And the cross-sectional area of the water passage formed by the side wall members shall be equal to or greater than that of the existing drainage ditches.

The embedded formwork is a fiber-reinforced cement board manufactured by vacuum extrusion molding, and has a cross-sectional shape with inverted trapezoidal projections to improve the adhesion performance with the cast concrete. assemble. The adhesion between the injection mortar and the existing lining is made by inserting reinforcing bars into the existing lining, and the mortar and the embedded formwork have a wedge effect of the inverted trapezoidal protrusions to prevent the mortar from coming off.

The embedded mold for the drainage groove forming member according to claim 2 comprises a vertical portion abutting the rising portion, a horizontal portion projecting from the head of the vertical portion toward the upper surface of the asphalt pavement layer, and a tip of the horizontal portion. and an oblique side portion extending upward from the ground covering portion, and the horizontal portion and the oblique side portion constitute the cover member. An opening is formed between the tip of the horizontal portion and the asphalt pavement layer so that the wheel of the two-wheeled vehicle does not come off.

The method for replacing and repairing a road bridge drainage ditch according to claim 3 is provided between the road covering section provided at both ends of the road surface width direction of the concrete floor slab of the road bridge and the asphalt pavement layer laid on the upper surface of this concrete floor slab. , A repair method for removing an aged steel drainage ditch with height-adjusting mortar interposed on the bottom surface and replacing it with a new drainage ditch, after removing the steel drainage ditch and the height-adjusting mortar , Leveling the exposed concrete floor slab, attaching reinforcing bars for attachment to the side surface of the ground covering part, and leveling the bottom plate part of the stainless steel plate for water stoppage having an L-shaped cross section and having a rising part on the side of the ground covering part. It is placed on the surface of the concrete floor slab, and an embedded formwork made of cement-based extruded material is erected on the concrete floor slab. The method is characterized in that mortar is filled between the embedded formwork and the ground cover to integrate the ground cover and waterproof the cross section of water flow.

1 shows a procedure for applying the drainage groove forming member according to claim 1 to a repair method in which an old steel drainage groove installed to drain rainwater from a road surface is removed and replaced with a new drainage groove. By removing the existing height adjustment mortar after removing the steel drainage ditch, a water flow cross section equal to or greater than that of the conventional steel drainage ditch is secured.

According to a fourth aspect of the present invention, there is provided a method for replacing and repairing a road bridge drainage ditch, wherein the embedded formwork is the embedded formwork for a drainage ditch forming member according to the second aspect. The opening formed between the tip of the horizontal part and the asphalt pavement layer is used for cleaning work as well as to prevent wheel detachment.

The drainage ditch forming member of the present invention comprises a water stopping stainless steel plate having an L-shaped cross section placed on a concrete floor slab as a bottom member for running water, and an embedded form erected on the concrete floor slab and a ground cover. Since the mortar is filled between them to form the side wall member, the mortar and stainless steel plate are not corroded by salt damage and have durability. In addition, since the stainless steel plate is placed directly on the concrete floor slab, almost all of the rainwater on the floor slab can be drained away, and water seepage into the concrete floor slab can be prevented by blocking the underside of the bottom member for running water. . Therefore, deterioration of the floor slab concrete due to water retention can be prevented, and water can be stopped by a stainless steel plate or the like, so that water leakage through the floor mortar as in the conventional case can be prevented.

In the buried mold for the drainage groove forming member according to claim 2, since the horizontal part and the oblique side part constitute the cover member, when earth and sand accumulate in the drainage groove, high pressure water etc. can be applied to the opening from the road. Therefore, it can be easily removed without opening a lid or the like, cleaning is facilitated, time and cost can be saved, and daily maintenance can be reliably and easily performed.

The replacement and repair method for road bridge drainage ditches according to claim 3 is a repair method for removing aged steel drainage ditches and replacing them with new drainage ditches. Since the embedded formwork is used, there are no restrictions such as stripping and curing, and the construction method does not require a formwork carpenter. Humanization and efficiency can be realized.

Since the method for replacing and repairing a road bridge drainage ditch according to claim 4 uses the embedded formwork for the drainage ditch forming member according to claim 2, an opening with a simple structure can be realized.

It is sectional drawing of the road bridge road surface width direction edge part which attaches a drainage groove formation member. It is an enlarged sectional view of an embedded formwork. 1 is a cross-sectional view of a road bridge end to which a conventional steel drainage ditch is installed; FIG.

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of an edge in the width direction of a road bridge surface to which a drainage groove forming member of the present invention is attached. A drainage groove forming member 1 is provided between a covering portion 3 provided at both ends of a concrete floor slab 2 of a road bridge in the width direction of the road surface and an asphalt pavement layer 4 laid on the upper surface of the concrete floor slab 2 .

This drain groove forming member 1 consists of a bottom member 5 for flowing water placed on a concrete floor slab 2 exposed between the covering portion 3 and the asphalt pavement layer 4, and a side wall standing on the covering portion 3 side. It has a member 6 .

The bottom member 5 for flowing water has a stainless steel plate 51 for stopping water with an L-shaped cross section and a waterproofing material 52 applied to the bottom of the cross section for water flow. It has mortar 62 to be filled between 61 and the ground covering part 3 .

The waterproof stainless steel plate 51 has a bottom plate portion 51a and a rising portion 51b on the side of the ground covering portion 3, and the embedded formwork 61 has a vertical portion 61a that abuts on the rising portion 51b and a vertical portion 61a that extends from the head of the vertical portion 61a. It has a horizontal portion 61b that overhangs the upper surface of the asphalt pavement layer 4, and an oblique side portion 61c that extends upward from the top of the horizontal portion 61b.

The embedded mold 61 is a fiber-reinforced cement board manufactured by vacuum extrusion molding, and has a cross-sectional shape having inverted trapezoidal projections on the inner surface as shown in FIG. This eliminates the need to assemble and remove factory-made forms on site. It has excellent strength and durability, is relatively lightweight, and is easy to construct. Raw materials include cement, silica powder, water, and polypropylene reinforcing fiber.

Attachment reinforcing bars 7 are attached to the side surface of the covering part 3, and the space between the embedded formwork 61 and the covering part 3 is filled with mortar 62. - 特許庁The mortar 62 and the embedded mold 61 are integrated by the wedge effect of the inverted trapezoidal protrusions.

The horizontal portion 61b and the oblique side portion 61c of the embedded formwork 61 constitute a cover member for the drain groove forming member 1, and are provided with openings to allow rainwater to flow in from the road surface. The width W of this opening is set to a width that does not cause the wheels of the two-wheeled vehicle to come off the wheel and that facilitates cleaning work. The simple structure of the opening improves the certainty and ease of daily maintenance.

The waterproof stainless steel plate 51 has a thickness of 1 mm or less, and a cross-sectional area for draining rainwater from the road surface is equal to or greater than that of the existing drainage groove. The water stop stainless steel plate 51 is fixed to the concrete floor slab 2 using a stainless steel retaining plate (not shown), a concrete anchor, and a nut, and a caulking agent or the like is filled between the concrete floor 2 and the water stop stainless plate 51. This will stop the water. The water stop stainless steel 51 connects the L-shaped SUS members, but both the left and right member ends are folded back, filled with a caulking material, and then put together so that the connecting portion does not become a weak point in terms of water stoppage.

The heights of the waterproof stainless steel plate 51 and the embedded formwork 61 against the unevenness of the concrete floor slab 2 are adjusted by applying an epoxy resin-based adhesive to the lower surface of the concrete floor slab 2, in consideration of water stopping.

Although this drainage groove forming member 1 can be applied to a new bridge, it is most suitable for a repair method of removing an existing deteriorated steel drainage groove 101 shown in FIG. 3 and replacing it with a new drainage groove. In this replacement repair method, first, the steel drain 101 and the height adjusting mortar 105 are removed, and then the exposed concrete floor slab 102 is leveled.

Next, an attachment reinforcing bar 7 is attached to the side surface of the ground covering portion 3 in the same configuration as in FIG. The bottom plate portion 51a of the water stop stainless steel plate 51 having an L-shaped cross section is placed on the upper surface of the leveled concrete floor slab 2, and the embedded form 61 is erected and fixed to the concrete floor slab 2. and the covering part 3 are filled with mortar 62 to be integrated with the covering part 3. Finally, a series of work is completed by constructing the waterproofing material 52 on the cross-section of the water passage. After removing the steel drainage ditch 101, the existing height adjusting mortar 105 is removed to ensure a water flow cross section equal to or greater than that of the conventional steel drainage ditch 101.例文帳に追加

After installing the embedded formwork, non-shrinkage mortar is placed to integrate it with the existing lining and concrete floor slabs. Therefore, it was decided to construct a full-scale model, cast cement-based non-shrinkage mortar, and evaluate its filling performance.

Placement was done manually, and compaction was done by hitting with a rubber hammer. As a result of cutting and observing the test piece, visual confirmation of the interface between the embedded formwork and mortar revealed no voids including sharply pointed tips, confirming good filling performance.

A full-scale experiment was carried out to confirm the waterproofness of the SUS member in the cross section through which water flows. Since the fixing bolt pitch of the pressing SUS plate affects fastening to the concrete floor slab, two types of pitches (250 and 300 mm) were used. It is essential to deal with the unevenness of the floor slab, so we used an epoxy resin adhesive on the lower surface of the L-shaped SUS member as an unevenness adjustment member to take water stoppage into consideration.

As a result of the water pressure test, no water leakage was observed from the floor slab and joints regardless of the fixing bolt pitch, confirming that there is no problem with water cutoff.

The drainage ditch forming member of the present invention is most suitable for use in a repair method in which an existing dilapidated steel drainage ditch is removed and replaced with a new one, but it can also be applied to new bridges. It can be expected as a new drainage structure that overcomes the shortcomings of steel drainage ditches.

1 Drain Forming Member 2 Concrete Floor Slab 3 Covering Part 4 Asphalt Pavement Layer 5 Bottom Member for Running Water 6 Side Wall Member 7 Adhesion Reinforcement Bar 51 Stainless Steel Plate for Waterproofing 52 Waterproof Work Material 61 Embedded Formwork 62 Mortar

Claims (4)

Between the ground guard provided at both ends of the road surface width direction of the concrete floor slab of the road bridge and the asphalt pavement layer laid on the upper surface of this concrete floor slab, in order to drain rainwater from the road surface, from the upper surface of the asphalt pavement layer A bottom member for running water located below, a side wall member erected on the side of the ground covering portion of the bottom member for running water, and a cover member provided from the side wall member to the upper surface side of the asphalt pavement layer and configured to allow rainwater to flow in. In the drainage ditch forming member having The side wall member comprises an embedded mold made of a cement-based extruded material that is erected on the concrete floor slab and has an outer surface that abuts the rising portion; A drainage ditch forming member characterized by being mortar to be filled between the formwork and the ground cover. The embedded form has a vertical portion that contacts the rising portion, a horizontal portion that projects from the head of the vertical portion toward the upper surface of the asphalt pavement layer, and an end of the horizontal portion that extends upward from the ground covering portion. 2. The drainage groove forming member according to claim 1, wherein the horizontal portion and the oblique side portion constitute the cover member. Aged steel with mortar for height adjustment interposed on the bottom surface between the ground cover provided at both ends of the road surface width direction of the concrete floor slab of the road bridge and the asphalt pavement layer laid on the upper surface of this concrete slab. A repair method for removing a steel drainage ditch and replacing it with a new drainage ditch, in which after removing the steel drainage ditch and the height adjustment mortar, leveling the exposed concrete floor slab and An attachment reinforcing bar is attached to the side surface of the part, and the bottom plate part of the stainless steel plate for water stoppage with an L-shaped cross section having a rising part on the side of the ground covering part is placed on the leveled concrete floor slab surface, and the cement-based extruded material The embedded formwork is erected on the concrete floor slab, the outer surface of this embedded formwork is fixed in contact with the rising part of the water cutoff stainless steel plate, and mortar is placed between this embedded formwork and the ground covering part A replacement and repair method for a road bridge drainage ditch, which is characterized by filling the ground cover and waterproofing the cross section of the water flow. 4. A method for replacing and repairing a road bridge drainage ditch according to claim 3, wherein said embedded formwork is the embedded formwork for a drainage ditch forming member according to claim 2.

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