JP3856791B2 - How to lay an overhanging sidewalk - Google Patents

Description

The present invention relates to a method for laying an overhanging pedestrian laid on an edge of an elevated road, for example.

Traditionally, irrigation channels have flown around the edges, or laying sidewalks at the edges of roads that have been routed through rice fields requires part of the irrigation channels and fields to be reclaimed. It took a lot.
To solve this problem, precast overhanging sidewalk blocks are joined in series in the length direction, and the sidewalk is extended and laid on the edge of the elevated road (roadway) formed higher than the irrigation canal and rice fields. (For example, refer to FIG. 1 and FIG. 2 and related explanations regarding the conventional example of Patent Document 1).

In this method of laying an overhanging sidewalk, first, the edge of the roadway where the overhanging sidewalk block is laid is excavated to form an excavation portion having a substantially L-shaped cross section, and then ready-mixed concrete is placed in the excavation portion. To form a base concrete layer. After that, place the formwork on top of the base concrete layer,
Several main bars are arranged in the formwork, and further, the distribution bars are arranged perpendicular to the main bars and coupled to the main bars. After that, anchor bolts for fixing the overhanging sidewalk block are planted at the calculated site, and then the ready-mixed concrete is continuously placed in the formwork and hardened and solidified to form a continuous foundation block. To do.
Then, the base of the overhanging sidewalk block is placed on the upper surface of the foundation block, the upper end of the anchor bolt is inserted into the bolt insertion hole provided in advance in the base, and the base plate and the nut fitted to the upper end are overhanged. Secure the sidewalk block to the foundation block with bolts.

After the mortar is filled and solidified in the bolt insertion hole, earth and sand are backfilled in the base portion of the overhanging sidewalk block and the side space of the foundation block, and the top surface of the backfilling earth and the overhang Repair the roadway by installing asphalt pavement material on the upper surface of the base of the sidewalk block, and create a sidewalk over the edge of the roadway by the floor slab part of the extended sidewalk block that is continuous on the opposite side of the base Yes.

In the overhanging sidewalk structure laid in this way, earth pressure due to the automobile load traveling on the roadway is
Since it is applied to the side surface of the base and the side surface of the foundation block, a sliding force in the horizontal direction acts on the overhanging sidewalk block. Further, the overhanging moment with the floor slab portion acting as a moment arm acts on the overhanging block due to the crowd load passing through the floor slab portion.

As described above, since the base of the overhanging sidewalk block is located at a shallow position of the asphalt pavement layer of the roadway, the mass of the asphalt pavement covering the upper surface of the base is calculated for stabilization to prevent the sliding and falling. In this case, it is negligible. In the stabilization calculation, the mass of the basic block is mainly calculated. Therefore, it is necessary to create a foundation block that is large and thick, and the amount of ready-mixed concrete used is excessively increased, and the time for curing is also increased.

As an improvement measure for the overhanging footpath structure that uses the foundation block as a resistance element against sliding and falling, an overhanging footpath with a backfill earth and sand layer interposed between the foundation block equivalent part and the asphalt pavement layer has been proposed (see above). (Refer to FIG. 3 to FIG. 7 of Patent Document 1 and the related explanation part).
In this overhang sidewalk structure, a bottom plate placed on the upper surface of the base concrete created on the installation ground, a side wall plate connected to the top surface of the outer edge of the bottom plate, and an overhanging floor connected to the upper end outer surface of the side wall plate An overhanging sidewalk is formed by the plate, and a space portion opened up and down by an opposing frame plate is formed on the bottom plate. After the reinforcing bars are placed in the space, ready-mixed concrete is cast, and the cast concrete and the bottom plate are integrated by curing to form a portion corresponding to the foundation block.

However, in this overhanging sidewalk, the volume of the space is specified by the width and thickness dimensions of the bottom plate, so there is no room to increase or decrease the mass of the portion corresponding to the base block. Therefore, the resistance to sliding and falling cannot be increased in accordance with the conditions of the laying site.
JP 59-179902 A

An object of the present invention is to secure a necessary and sufficient resistance to sliding and falling in accordance with the conditions of the laying site without having to excessively increase the amount of ready-mixed concrete to be placed on the site.

The main feature of the laying method of the invention of claim 1 is that it is placed on the upper surface of the foundation concrete formed on the laying ground and fixed to the foundation concrete by bolting, and connected to the upper surface of the outer edge of the fixing bottom plate. When constructing an overhanging sidewalk block by a side wall plate and an overhanging floor plate connected to the outer surface of the upper end of the side wall plate, and laying the overhanging sidewalk by joining the overhanging sidewalk block in series in the length direction The width of the foundation concrete is larger than the molding width of the fixed bottom plate, and the thickness of the foundation concrete including the widened portion is set to be large, and the mass of the foundation concrete itself including the widened portion and the widened portion of the sand backfill is on foundation concrete, including the mass of such road paving material, the stabilization calculation for overturning and sliding blocking of the overhang sidewalk It is that you obtain so.

In the laying method of the present invention, the foundation concrete 10 is formed separately and independently from the fixed bottom plate 6 of the overhanging sidewalk block 5, and the width of the foundation concrete is determined from the forming width of the fixing bottom plate of the overhanging sidewalk block. The foundation concrete including the widened portion is set to a large thickness, the mass of the basic concrete itself including the widened portion , the backfill earth and sand on the basic concrete including the widened portion , and the road pavement. By adding the mass of materials to the stabilization calculation to prevent overhang of the overhanging sidewalk block, it is possible to respond to the conditions of the laying site without having to increase the amount of ready-mixed concrete concrete excessively. The necessary and sufficient resistance against sliding and falling can be ensured accurately.

1 to 3 show an embodiment of the present invention.
In laying work, first, the outer edge of the roadway 1 where the overhanging sidewalk is laid is excavated one step lower. This excavation is performed with care so as not to dig down too much. If the foundation ground is disturbed due to digging too much, the excavation is sufficiently compacted by a compactor or the like.
The ground crushed stone 2 is laid on the bottom of the excavation part, and it is fully rolled and finished to a predetermined thickness so that there is no unevenness. At this time, if there is a soft spot at the bottom of the foundation, the part is removed and replaced with chestnut or concrete.

The reinforcing bar 3 is assembled on the upper surface side of the basic crushed stone layer, and the anchor bolt 4 is bound to the reinforcing bar 3 and arranged. The anchor bolts 4 are arranged at positions calculated so that the anchor bolts 4 pass through the bolt insertion holes 7 in the fixing bottom plate 6 of the overhanging sidewalk block 5 when the overhanging sidewalk block 5 is installed.

Installation site conditions and sidewalk usage conditions (expected number of vehicles traveling on the roadway, overhanging sidewalk block 5
The formwork is assembled around the reinforcing bars 3 and the anchor bolts 4 so that the foundation concrete 10 having the width and thickness calculated by the assumed load of the traffic crowd on the overhanging floor slab 9 is formed. Ready-mixed concrete is placed in the space inside the frame.
After placing, rough finish the surface with a wooden iron, and finish when the water is drawn. After curing of foundation concrete 10, mortar 11 with a thickness of about 20mm to 30mm
Is given.

Using the drain hole 13 provided in the side wall plate 8 of the overhanging sidewalk block 5, the overhanging sidewalk block 5 is installed with a crane vehicle using a dedicated lifting jig. At this time, the fixed bottom plate 6 of the overhanging sidewalk block 5 is placed on the mortar 11 while being carefully positioned so that the upper end portion of the anchor bolt 4 from the foundation concrete 10 is inserted into the bolt insertion hole 7. Placed.

A seat plate 14 and a nut 15 are fitted to the anchor bolt 4 in the bolt insertion hole 7, and the fixing bottom slab 6 is fixed to the foundation concrete 10 by bolting and joining. After the completion of the bolt joining, the bolt insertion hole 7 is filled with a closing mortar 16.
After the fixing bottom plate 6 is connected to the foundation concrete 10, the overhanging sidewalk blocks 5 are interconnected. This connection is achieved by connecting a hexagon bolt 18 through a through hole of the connecting plate 17 to a nut type insert (not shown) embedded in the side surface of the fixing bottom plate 6 and the side wall plate 8 at the time of molding.
Is made by screwing

After disposing a required sucking prevention material in the drain hole 13 and the drain joint, the earth and sand 19 is backfilled in the excavation space. When placing ready-mixed concrete as filling material, the concrete is placed after covering the drainage joints so that the concrete does not leak. The asphalt pavement of the roadway is constructed on the upper surface of the backfill soil layer as required according to a conventional method.
The guide pipe 1 is inserted into the pipe hole 20 provided on the outer edge of the overhanging floor slab 9 of the overhanging sidewalk block 5.
2 is inserted, and finally the butt joint of the overhanging floor slab 9 is processed with mortar to complete the overhanging sidewalk.

In the illustrated embodiment, the width of the foundation concrete 10 is the fixed bottom plate 6 of the overhanging sidewalk block 5.
The width of the widened portion EL itself and the portion of the backfill earth and sand 19 on the widened portion EL (if the roadway is asphalt paved, the pavement portion is Mass) is added to the stabilization calculation as a large resistance element against the sliding of the overhanging sidewalk block 5 and the fall prevention. The backfill earth and sand 19 on the fixed bottom plate 6 is also counted as a resistance element.
The inner edge portion of the fixing bottom plate 6 is formed to be raised, and the pocket portion 6b that holds the backfill earth and sand 19 is formed between the base portion of the side wall plate 8 so that the resistance to sliding is further enhanced. Has been.

In the method of the present invention, the foundation concrete 10 is formed separately and independently from the fixed bottom plate 6 of the overhanging sidewalk block 5, so that the necessary and sufficient width is not restricted by the width and thickness of the fixed bottom plate 6. Can be uniquely formed in thickness. In addition, a certain level difference is set between the fixed bottom plate 6 and the overhanging floor plate 9 by the side wall plate 8, and earth and sand 19 are backfilled on the fixed bottom plate 6, so that The amount of ready-cast concrete used can be reduced to reduce material costs, the time required for curing and hardening the cast concrete can be shortened, and the overall construction period can be shortened.

It is a longitudinal cross-sectional view of the overhanging side laid by the laying method of this invention. It is a right view which shows the laying process of the overhanging sidewalk of FIG. It is a top view which shows the laying process of the overhanging sidewalk of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Roadway 2 Foundation crushed stone 3 Reinforcing bar 4 Anchor bolt 5 Overhang sidewalk block 6 Fixing bottom plate 7 Bolt insertion hole 8 Side wall plate 9 Overhang floor plate 10 Foundation concrete 11 Laying mortar 12 Guard pipe 13 Drain hole 14 Seat plate 15 Nut 16 Blocking Mortar 17 Connection plate 18 Hex bolt 19 Backfill earth and sand 20 Pipe hole EL Widened part of foundation concrete

Claims (1)

Placed on the upper surface of the foundation concrete built on the laying ground and fixed to the foundation concrete by bolting, the side wall plate connected to the upper surface of the outer edge of the fixed bottom plate, and the upper end surface of the side wall plate. In the case where the overhanging sidewalk block is constructed by connecting the overhanging sidewalk block and the overhanging sidewalk block is laid in a series in the length direction, the width of the foundation concrete is set to the fixed bottom plate. The width of the foundation concrete including the widened portion is set larger than the molding width, and the mass of the basic concrete itself including the widened portion and the backfill on the basic concrete including the widened portion are set. A method for laying overhanging trails that adds the mass of earth and sand, roadway pavement materials, etc. to the stabilization calculation to prevent the overhanging sidewalk block from falling or sliding.

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