JP4726259B2 - Road widening structure - Google Patents

Description

The present invention relates to a road widening structure using a slope portion inclined downward from a shoulder portion on the valley side as a support portion for an overload.

In existing roads built in the middle of slopes in mountainous areas, etc., it is difficult to widen the road to the mountain side if it is necessary to widen the road due to increased traffic or large vehicles. A roadbed member for widening is projected over the space above the slope portion on the valley side.

In an example of a conventional road widening method, a concrete support is supported on a foundation buried at a distance in the slope, and a beam is bridged between each support, and the beam is attached to the side edge of the existing road. Both side edges of the road bed slab are supported by the installed support beams (see Patent Document 1).

However, in the road widening method described above, there are many processes at the construction site, such as a process of standing columns, a process of bridging beams between columns, and a process of installing a road bed slab, resulting in a longer construction period and higher construction costs. There was a problem. In addition, since the road bed slab is supported by a column, there is a problem that it is difficult to obtain sufficient strength for a heavy load such as a roadway.

In another road widening structure, an upper foundation body is provided on the shoulder portion of the valley side of the existing road, a lower foundation body is provided on the slope portion in contact with the road shoulder portion, and a plurality of widening roadbed members made of L-shaped block bodies are reversed. A vertical plate of the L-shaped block body is fixed to the upper base body by anchor bolts, the tip of the horizontal plate portion of the L-shaped block body placed upside down in an L-shape and placed on the upper base body. The lower end of the part is supported on the upper surface of the lower basic body (see Patent Document 2).

In this road widening structure, the space surrounded by the L-shaped block body and the slope portion is used as a space for arranging a living lead such as an electric wire or a warehouse for road maintenance goods, so it is left as it is. In order to ensure the required bearing force, the upper load from the vehicle passing through the horizontal plate portion of the L-shaped block body is directly applied to the lower base body. A plurality of foundation piles are driven in, the lower foundation body is fitted into the upper end groove portion of the foundation pile, and the lower end of the vertical plate portion of the L-shaped block body is fixed to the lower foundation body by an anchor bolt.

However, it is not easy construction to drive foundation piles into the slope of the valley side, and the period of occupying the existing road to drive a large number of foundation piles, that is, the period of traffic regulation such as road closure becomes longer, When the road is a residential road, the impact on local residents is great. Moreover, the fixing work of the L-shaped block body with respect to the upper base body and the lower base body using the anchor bolts is complicated, which causes a long construction period.

JP 2000-352001 A JP 2004-346729 A

An object of the present invention is to provide a road widening structure that does not require a driving work for a foundation pile with a high construction cost, can be shortened, and has high strength.

The road widening structure of the present invention has a plurality of L-shaped block bodies provided with an upper base body at a shoulder portion on the valley side of an existing road, and provided with a lower base body along the existing road at a slope portion in contact with the road shoulder portion. The widening roadbed member is inverted in an inverted L shape and arranged side by side along the existing road, and a locking rib formed on the lower edge of the lower surface of the horizontal plate portion of the L-shaped block body is provided with the upper base. Engaging with retaining ribs formed on the outer edge of the upper surface of the body, the top end of the horizontal plate portion of the L-shaped block body is supported by the upper base body, while the lower end of the vertical plate portion of the L-shaped block body Is supported on the upper surface of the lower base body, and the filling material is filled into the space surrounded by the L-shaped block body and the slope portion through the filling opening formed in the horizontal plate portion of the L-shaped block body. filled, the method surface and said L-shaped block body through the in packed filler By body structuring is over mounting load of the widening subgrade portion that so as to supported by said method surface.

In the road widening structure of the present invention, the upper base body provided on the shoulder portion on the valley side of the existing road supports the front end portion of the horizontal plate portion of the L-shaped block body, while the vertical plate portion of the L-shaped block body is supported. Filled in a space surrounded by the L-shaped block body and the slope portion through a filling opening formed in the horizontal plate portion of the L-shaped block body with a lower end supported on the upper surface of the lower base body From the passing vehicle C loaded on the horizontal plate portion of the L-shaped block body by integrating the slope portion and the L-shaped block body through the solidified filling material. is transmitted to the entire surface of the notation face previous mounting load is distributed over the, it is possible to responsible throughout the process surface, sufficiently able to provide a large bearing force, high road widening structures strength without foundation pile Accurately obtained.

Thus, since it is not necessary to drive the foundation pile into the slope part where the construction is not easy, the construction period of the road widening work is shortened and the construction cost can be reduced. In addition, since the road is not blocked by the foundation pile driving machinery and equipment, road traffic restrictions are reduced, and in the case of a residential road, there is little impact on local residents.

In addition, when filling the filling material into the space surrounded by the L-shaped block body and the slope portion, the locking rib at the lower end edge of the horizontal plate portion of the L-shaped block body has the upper base body While the lower end of the vertical plate portion of the L-shaped block body is supported on the upper surface of the lower base body, the L-shaped block body is anchor bolts. Without using the stuffing, it is held in the initial installation position from the beginning of filling of the filling material until solidification, so it is easy to do the filling work, and the completed dimensions of the widened roadbed part are out of order. Absent. The tightening and fixing work with anchor bolts is not necessary, so the construction period can be further shortened.

The road widening structure of the present invention can be easily constructed without disrupting the current situation as much as possible, can suppress road regulation due to traffic closure, etc., can disperse load even when large vehicles pass, and erodes slopes due to rainwater, etc. It can also be prevented. Moreover, it is possible to easily cope with curve construction.

In the illustrated embodiment, the upper foundation body 1 appropriately excavates and compacts the shoulder on the valley side of the existing road A to be widened, incorporates reinforcing bars between the formwork panels arranged at the required intervals, and casts in place concrete. It is formed by pouring and curing. The upper foundation body 1 is installed in series along the existing road A, and the retaining rib 2 is formed at the valley side edge of the upper foundation body 1.
The lower foundation 3 is made by appropriately excavating and compacting the slope portion B inclined downward from the shoulder on the valley side of the existing road A, incorporating reinforcing bars between the formwork panels arranged at the required intervals, and placing cast-in-place concrete. It is formed by pouring and curing. The lower basic bodies 3 are installed in series along the existing road A.

The L-shaped block body 4 of the widening roadbed member is a precast concrete product, and is composed of a horizontal plate portion 5 and a vertical plate portion 6. A locking rib 7 is formed in a series at the tip of the lower surface of the horizontal plate portion 5. The vertical plate portion 6 is formed at a right angle on the base end side of the horizontal plate portion 5. A wheel stopper rib 8 is formed with a step on the upper surface of the base end portion of the horizontal plate portion 5, and a receiving hole 11 into which the column 10 of the guard rail 9 is inserted is formed in the wheel stopper rib 8.
The horizontal plate portion 5 is formed with a semicircular filling opening portion 12 and is filled with cast-in-place concrete or the like through the circular opening portion where the filling opening portions 12 of two adjacent horizontal plate portions 5 are combined. Filler 13 is filled. As the filling material 13 for filling, concrete, heavy mortar, or the like can be used.
A pavement layer 14 is applied to the upper surface portion of the horizontal plate portion 5 of the L-shaped block body 4 constituting the hearth so as to align the level with the pavement surface of the existing road A. Note that, depending on the construction slope, it is possible to counteract sliding by driving a pile or anchor bar 15.

FIG. 2 is a perspective view showing a road widening structure according to an embodiment of the present invention before filling with an intermediate filling material. It is a perspective view of the L-shaped block body used for the road widening structure of FIG. It is a perspective view from another direction of the L-shaped block body of FIG. It is a perspective view of the road widening structure of this invention after filling with a filling material for filling.

A Existing road B Slope C Vehicle 1 Upper base body 2 Retaining rib 3 Lower base body 4 L-shaped block body 5 Horizontal plate portion 6 Vertical plate portion 7 Locking rib 8 Wheel stop rib 9 Guard rail 10 Post 11 Receiving hole 12 Filling Opening 13 for filling 14 filling layer for paving

Claims (1)

An upper foundation body is provided on the shoulder portion on the valley side of the existing road, a lower foundation body is provided along the existing road on the slope portion in contact with the road shoulder portion, and a plurality of widening roadbed members made of L-shaped block bodies are reversed. Inverted in an L-shape and juxtaposed along the existing road, a locking rib formed on the lower end edge of the lower surface of the horizontal plate portion of the L-shaped block body is formed on the upper outer edge of the upper base body Engaging with retaining ribs, the upper end of the horizontal plate portion of the L-shaped block body is supported by the upper base body, while the lower end of the vertical plate portion of the L-shaped block body is on the upper surface of the lower base body was supported, through said L-shaped block body said horizontal plate portion filling opening formed in the said filling the L-shaped block body and Chutsume filler enclosed space in said process surface, wherein during filling filler The slope portion and the L-shaped block body are integrally formed through , Road widening structure over the mounting load of the widening subgrade portions so as to supported by said method surface.

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