JP2005194722A - Method of laying overhang sidewalk - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To sufficiently ensure required resistance force to sliding and overturning, corresponding to the conditions of a laying site without needing to excessively increase the amount of ready-mixed concrete placed at the site. <P>SOLUTION: An overhang sidewalk block is composed of an anchor bottom slab placed on the upper face of foundation concrete constructed on the laying ground, and fixed to the foundation concrete by bolt joining; a sidewall slab connected to the outer edge upper face of the anchor bottom slab; and an overhang floor slab connected to the upper end outer surface of the sidewall slab. The overhang sidewalk blocks are joined in a chain in a length direction to lay an overhang sidewalk. In this case, one or both of width and thickness of the foundation concrete are set large, and mass of the foundation concrete itself and mass of backfilling sediment, a sidewalk paving material, or the like on the foundation concrete are added to stabilization calculation for impeding overturning and sliding of the overhang sidewalk block. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a method for laying an overhanging trail that is 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, the mold is placed on the base concrete layer so as to face each other, several main bars are arranged in the mold, and the reinforcing 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. Fasten 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 extended sidewalk structure laid in this way, the earth pressure due to the load of the vehicle traveling on the roadway is applied to the side surface of the base and the side surface of the foundation block. Is working. 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 or 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 and the related explanation part of Patent Document 1).
In this overhang sidewalk structure, the bottom plate placed on the upper surface of the base concrete created on the installation ground, the side wall plate connected to the upper surface of the outer edge of the bottom plate, and the 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 In this case, one or both of the width and thickness of the foundation concrete is set to be large, and the mass of the foundation concrete itself and the mass of backfill sediment, roadway pavement, etc. on the foundation concrete are used to prevent overhang of the overhanging sidewalk block and sliding prevention. It is to be added to the stabilization calculation for.

In the laying method of the present invention, one or both of the width and thickness of the foundation concrete is set to be large as necessary, and the mass of the foundation concrete itself and the mass of backfill earth and sand, roadway pavement, etc. on the foundation concrete are tensioned. Since it was added to the stabilization calculation for the fall of the walkway block and prevention of sliding, it was not necessary to increase the amount of ready-mixed concrete at the site, and it was possible to cope with the sliding and falling according to the conditions of the laying site. Necessary and sufficient resistance 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.

Basic concrete 10 of width and thickness calculated according to the conditions of the laying site and the usage conditions of the sidewalk (assumed number of traveling vehicles on the roadway, assumed load of traffic crowd on the overhanging floor slab 9 of the overhanging sidewalk block 5) Is formed around the reinforcing bar 3 and the anchor bolt 4, and ready-mixed concrete is placed in the inner space of the mold.
After placing, rough finish the surface with a wooden iron, and finish when the water is drawn. After curing and curing the foundation concrete 10, a mortar 11 having a thickness of about 20 to 30 mm is applied.

  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 made by screwing a hexagon bolt 18 through a through hole of the connection plate 17 into 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.

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 12 is inserted into the pipe hole 20 provided on the outer edge of the overhanging floor block 9 of the overhanging block 5, and finally the butt joint of the overhanging floor 9 is treated with mortar, and the overhanging sidewalk Is completed.

In the illustrated embodiment, the width of the foundation concrete 10 is wider than the molding width of the fixing bottom plate 6 of the overhanging sidewalk block 5 and is above the mass of the widened portion EL itself and the widened portion EL. The mass of the backfill earth and sand 19 (including the paving material when the roadway is asphalt pavement) is added to the stabilization calculation as a large resistance factor against sliding and overturning prevention of the overhanging sidewalk block 5 Will be. 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 Reinforcement 4 Anchor bolt 5 Overhang sidewalk block 6 Fixing bottom plate 7 Bolt insertion hole 8 Side wall plate 9 Overhanging floor plate 10 Basic 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, fixed bottom plate fixed to the foundation concrete by bolting, side wall plate connected to the outer edge upper surface of the fixed bottom plate, and connected to the upper end outer surface of the side wall plate In the case of constructing an overhanging sidewalk block by connecting the overhanging sidewalk block in a series of lengths, one or both of the width and thickness of the foundation concrete is Overhanging sidewalk which is set large and adds the mass of foundation concrete itself and the mass of backfill earth and sand, roadway pavement materials, etc. on the foundation concrete to the stabilization calculation to prevent the overhanging sidewalk block from falling or sliding Laying method.

Images