JP2004019352A - Widened road - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To widen the width of a road while reducing temporary work and dangerous construction on a slope by allowing the construction of sediment of a widened part with a simpler earth retaining member. <P>SOLUTION: A pile 4 is erected by setting its lower part into the valley side slope of the road. An anchor 2 is fixed to the existing road 1, and the end part is connected to the pile 4. A panel 8 is disposed behind the pile 4 to perform banking between the natural ground of the slope. Since the anchor 2 is disposed using the existing road, construction on the slope is facilitated, and a lightweight banking material is used to reduce load applied to the pile 4 and the panel 8. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a widened road in which the width of an existing road is increased, and more particularly to a widened road in which temporary work on a slope is reduced.
[0002]
[Prior art]
In mountainous areas, there are cases where one side of a road is a building or a mountain-side slope that is hard to break down, and the other side is a downward slope. Extremely difficult construction is required to increase such a road width. The present applicant has proposed Japanese Patent No. 16026224 (Japanese Patent Publication No. 2-28641) as an invention relating to such a widened road that enlarges the width of an existing road. The invention extends a tension material from an existing road to a valley-side slope, connects a precast concrete block standing on the valley-side slope to the tension material, and burys earth and sand between the block and the slope ground to form a road width. Is to expand.
[0003]
[Problems to be solved by the invention]
In the above-mentioned patent invention, since the tensile member is directly connected to the precast concrete block erected on the valley side slope, extremely unstable work is required until the tension member is connected and the block is stabilized. The block must be suspended from the existing road to the valley slope by a crane, installed on a slope with severe unevenness, and connected with a tensile member to stabilize it. The work of connecting the tensile material and the work of burying the earth and sand are required with the unstable block, and the work becomes extremely difficult. A block can be several tons, and it remains unstable, which implies a great deal of danger to the construction. Until the next block is stabilized, the next block cannot be hung down, and the construction will take an extremely long time.
[0004]
Precast concrete blocks are not limited to one step, and it is necessary to stack multiple steps depending on the condition of the slope. If all these blocks are connected to tension members to receive sediment loads, a remarkably large number of tension members will be required, and burial and connection work will require an extremely large amount of work and labor, and construction costs Was soaring.
[0005]
In the above-mentioned patented invention, the load of the earth and sand raised on the slope is received by the precast concrete block connected to the tensile member. there were. It is desired to reduce the load acting on earth retaining members such as blocks by reducing the earth and sand load raised on the slope to a lighter member having good workability, thereby reducing construction costs.
[0006]
[Means for Solving the Problems]
The present invention provides a widened road in which a lower portion of a pile is buried and erected on a slope, an upper portion of the pile is connected to a tensile member extended from an existing road, and a panel and a sediment load are suppressed by the pile to receive a sediment load. This solves the above problem.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
In the widened road according to the present invention, a plurality of piles are erected at appropriate intervals on a valley-side slope of the road. Various types of piles can be used, such as a stainless steel strip-shaped steel sheet rolled into a loop and cast into concrete in a cylindrical winding sheath, H-shaped steel, channel steel, etc. Shaped steel, concrete pile, etc. can be widely used. It is preferable that the winding sheath is not cylindrical but deformed into a rectangular tube because the contact area can be increased. The lower portion of the sheath is inserted into a hole excavated on a slope, and concrete is poured into the inside to form a pile. Reinforcing bars can be arranged inside the sheath. In addition, it is preferable to use two of the H-shaped steel and the channel steel as one set.
[0008]
Anchors are fixed to the existing road. As the anchor, PC strand or PC steel wire with zinc aluminum alloy plating on the outer surface or through unbonded sheath can be used, and grout material is injected by inserting into the drilled hole formed in the ground on the mountain side Then, the inserted portion is fixed. The part to be inserted into the hole is not passed through the unbonded sheath. The anchor may be buried vertically in the ground, or may be buried in a borehole excavated at an angle to the valley side or the mountain side as shown in FIGS. 9 and 10. A plurality of anchors are fixed at appropriate intervals while traveling on the road. The part of the anchor that protrudes from the ground crosses the existing road and connects its end to the top of the pile. Not only anchors anchored in boreholes but also anchors embedded in embankments can be used.
[0009]
Panels will be installed on the road side of the pile. Various materials and shapes are conceivable for the panel, but various shapes such as a concrete block-shaped panel or a flat block-shaped panel whose middle part is hollowed out to the ground side in an arc-shaped plane shape are widely used. Can be adopted. If the panel is a block, penetrate the block vertically with holes, and when stacking this block in multiple stages, insert a reinforcing bar etc. into this hole and inject grout material and connect the top and bottom I do. As the other panels, panels made of various materials such as a weather-resistant steel panel, a compressed wooden panel, a synthetic resin panel, and a wire mesh such as a rustproof expanded metal can be used.
[0010]
Embankment material is buried between the panel and the ground on the slope. In addition to the usual earth and sand, air mortar, gap grade concrete (porous concrete), styrofoam, etc. are used as embankment material, and the panel is cast behind it as a formwork to fill the gap between the panel and the slope ground. You may. To make this more effective, a hollow void tube can be embedded in the embankment material to further reduce the embankment. The embankment material is buried between the existing road and the panel as described above, and the embankment is used as a widened road that is continuous with the existing road.
[0011]
【Example】
Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. FIG. 1 shows a perspective view of a construction state, and FIGS. 2 to 4 show an example of a construction order. In the figure, reference numeral 1 denotes an existing road. Anchors 2 are fixed to the mountain-side end of the existing road at appropriate intervals in the direction of travel of the road. As the anchor 2, a PC strand whose surface is plated with zinc-aluminum alloy for rust prevention is used. The anchor 2 is inserted into a drilled hole 3 formed vertically on the mountain side, and grout material is injected and fixed. In addition, FIG. 8 and FIG. 8 show the case where the borehole 3 is excavated diagonally to the mountain side or the valley side. The tension member 2 traverses the existing road, and its tip reaches the valley side slope.
[0012]
A plurality of piles 4 are erected on the valley side slope of the road at appropriate intervals. In the embodiment shown in FIGS. 1 to 5, the pile 4 is formed by deforming a winding sheath 5 into a rectangular tube, and the lower part of the sheath 5 is inserted into a hole 7 formed on a slope, and And concrete 6 is cast with reinforcing bars. FIG. 6 shows a case in which two 19 H-shaped steels are used as the pile 4, and FIG. 7 shows a case in which two 20 channel steels are used as the pile 4. The end of the anchor 2 described above is penetrated and connected to any one of the upper portions of the pile 4. The anchor 2 may be extended horizontally from the existing road 1 to the valley side and connected to the upper part of the pile 4, or may be slightly inclined downward as shown in the figure to project to the valley side and connected to the pile 4.
[0013]
Behind the pile 4, that is, on the slope side, the panels 8 are erected and arranged. In the embodiment shown in FIGS. 1 to 13, a precast concrete block is used as the panel 8. In the embodiment, a concrete block having an arcuate (arch) shape in which an intermediate portion is formed on a slope side is used as the panel 8. The blocks 8 are placed side by side on the base concrete 9 that has been poured in continuously along the direction of road travel on the slope, and are further stacked up and down. The connecting holes 7 vertically penetrated to the panel 8 are made to coincide with each other, and the reinforcing bar 10 is passed through the connecting holes 11 of the panel 8, and grout material is injected to the middle of the panel 8 and fixed. As shown in FIG. 13, the reinforcing bar 10 does not pass through the entire panel 8. If the pile 4 is lower than the block 8 arranged at the upper end, the reinforcing bar 10 may be simply connected to the block 8 below. The horizontally arranged panels 8 are fixed by the panels 8 located at the left and right ends through a PC strand 13 coated with a zinc-aluminum alloy in a horizontally tightened hole 12 that is horizontally penetrated, and integrated as a whole.
[0014]
Embankment is applied between panel 8 and slope ground. Each time the panel 8 is stacked, the earth and sand 14 may be buried in the back as an embankment. However, as shown in FIG. 13, a lightweight embankment material 15 such as air mortar, gap grade concrete or styrene foam is used as the panel 8 as a formwork. May be cast. In FIG. 13, a hollow void pipe 16 is buried in the lightweight embankment material 15 to reduce the embankment load. By reducing the weight of the embankment in this manner, the earth and sand load acting on the panel 8 and the pile 4 can be reduced, and the construction cost can be reduced. Further, in FIG. 13, a curved surface supporting plate 21 which is curved in an arc shape is arranged on the mountain-side curved portion and the valley-side curved portion of the anchor 2 so that the tensile material 1 does not enter the ground due to the load. Instead of the curved support plate 21, the anchor 2 may be supported on the valley side and the hill side of the existing road 1 by constructing a supporting portion of concrete continuously in the traveling direction of the road. Embankment is carried out on the embankment portion and the existing road 1, and the height is leveled and paved to form a widened road.
[0015]
FIGS. 11 and 12 show the case where the embankment anchor 17 is used. A PC strand having a zinc-aluminum alloy plating on its outer periphery is bent into a U-shape, and the bent portion is arranged on the mountain side, and arranged in a groove 18 excavated on the road surface. Crushed stone, concrete, mortar, and the like are packed and fixed in the groove 18.
[0016]
FIGS. 14 and 15 show an example in which expanded metal having a somewhat increased strength is used as a panel material. The expanded metal 22 is bent into an arc shape and reinforced by a reinforcing bar 23. This is arranged on the ground side of the pile 4 and a lightweight embankment material 15 is cast behind the panel 8. The panel 8 serves as a formwork, and the lightweight embankment material 15 behind it hardens, so that the lightweight embankment material 15 can receive the load of the slope ground even if the strength of the panel 8 itself is not so large. A permeable membrane or the like may be provided behind the panel 8 to prevent the leakage of the embankment material 15.
[0017]
【The invention's effect】
The present invention has the above configuration, and can obtain the following effects.
(1) A pile is erected on the slope on the valley side, the lower part is inserted into the slope, the upper part is connected to the anchor, and the sediment load acting on the panel is supported by the pile. Cracks are less likely to occur.
(2) Since the anchor is connected to the top of the pile and the pile presses the panel and receives the sediment load, there is no need to fix each panel to the anchor, so the number of anchors and the labor for connection are small, and construction is easy. .
(3) Since the anchor is constructed using the existing road and the anchor is connected only to the upper part of the pile, there is no need to temporarily install the anchor on the slope and the construction is easy.
(4) Since the upper part of the pile is connected to the anchor, deformation of the pile is small, and the possibility of cracks occurring on the embankment is small.
{Circle over (5)} The blocks to be panels can be connected and integrated by stacking them up and down and passing a reinforcing bar, facilitating stacking and connecting panels.
(6) By using a lightweight embankment material as the embankment material, the earth and sand load acting on the panel and the pile can be reduced, and the construction cost can be reduced.
(7) Even if a panel that is not too strong, such as expanded metal, is used as the panel, a lightweight embankment, such as air mortar, is cast behind it and hardened to reduce the earth and sand load of the ground with the embankment and the panel. Can support.
[Brief description of the drawings]
FIG. 1 is a perspective view of one embodiment of a widened road according to the present invention.
FIG. 2 is a construction view of the embodiment shown in FIG.
FIG. 3 is a construction drawing of the embodiment shown in FIG. 1;
FIG. 4 is a construction drawing of the embodiment shown in FIG. 1;
FIG. 5 is a cross-sectional view of one embodiment of a pile.
FIG. 6 is a plan view of another embodiment of the pile.
FIG. 7 is a plan view of another embodiment of the pile.
FIG. 8 is a sectional view of another construction state.
FIG. 9 is a cross-sectional view of another embodiment of the anchor.
FIG. 10 is a cross-sectional view of another embodiment of the anchor.
FIG. 11 is a plan view using an embankment anchor.
FIG. 12 is a sectional view of an existing road in which an embankment anchor is buried.
FIG. 13 is a sectional view showing another construction state.
FIG. 14 is a perspective view of an example in which expanded metal is used for a panel.
FIG. 15 is a perspective view of a construction example using the panel shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Existing road 2 Anchor 3 Drilling 4 Pile 5 Winding sheath 6 Concrete 7 Hole 8 Panel 9 Foundation concrete 10 Connection hole 11 Reinforcing bar 12 Lateral tightening hole 13 PC strand 14 Earth and sand 15 Lightweight embankment material 16 Hollow void pipe 17 Embankment anchor 18 Groove 19 H-section steel 20 Channel steel 21 Curved bearing plate 22 Expanded metal 23 Reinforcing bar

Claims (3)

A plurality of piles are erected on the slope of the road valley at appropriate intervals, and the lower part is buried and erected.The end of the anchor, which is separated and fixed appropriately on the road, is connected to the upper part of the pile, and panels are installed on the road side of the pile. A widened road with an embankment applied between the panel and the slope and connected to the existing road. 2. The widened road according to claim 1, wherein concrete blocks are used as panels, and the blocks are stacked in a plurality of levels, and two or more of the layers are integrated vertically through connecting members. The widened road according to claim 1, wherein a lightweight embankment material such as air mortar or styrofoam is used as the embankment material.

Images