JP2958949B2 - Road expansion method and road expansion structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a road expanding method and a road expanding structure in which a valley extends to a valley side of an inclined road.

[0002]

Conventionally, as shown in FIG. 5, the extension of a road of this type requires a retaining wall 10 on the valley side of the road 101. As shown in FIG.
2 and the road is expanded by filling the embankment 104 between the back of the retaining wall 102 and the inclined surface 103, and a concrete lower foundation 104 is attached to the inclined surface 103 as shown in FIG. At the same time, a pillar 105 is erected on the lower foundation 104, and a concrete upper foundation 106 is constructed at the valley side end of the existing road 101, and the concrete floor slab 107 is formed by the pillar 105 and the upper foundation 106. A structure or the like that overhangs and supports is used.

However, in the structure using the above retaining wall 102, it is necessary to enlarge the retaining wall 102 and a lower base portion 102A thereof in order to prevent the retaining wall 102 from falling down. Become large-scale, and embankment
Since the earth pressure due to 104 increases, a large retaining wall 102 is required.

Further, in the above-described structure in which the concrete floor slab 107 is extended and supported, the valley side of the existing road 101 must be excavated and the upper foundation 106 must be constructed here. The construction cannot be done unless the roads are completely closed during the period. Further, since the concrete floor slab 107 is provided so as to protrude in a horizontal state, in order to obtain a sufficient strength against a load applied to a portion protruding from the position of the support post 105 to the valley side, the upper foundation 10 is required.
6, the concrete floor slab 107 must be firmly connected to the upper foundation 106.

Therefore, although not known, the retaining wall shown in FIG.
In the structure using 102, as shown in FIG.
It is conceivable that the anchor 2 is supported by the anchor 108 to prevent it from overturning. And thus the anchor 108
By using the anchor, it is possible to stabilize the retaining wall 102. For example, as the construction of the anchor 108, as described in Japanese Patent Application Laid-Open No. 1-244003, an anchor for a lock anchor which is an anchor is used. A hole is drilled in the ground, an anchor concrete is poured into the anchor hole, and a PC steel material for the anchor is inserted to fix the inner end of the PC steel material for the anchor in the anchor concrete. After the anchor concrete is solidified, a supporting plate is arranged at the opening of the anchor hole, and the projecting end of the anchor PC steel is tensioned and fixed.
~ 12 lines).

However, in order to construct the anchor 108 at the site as shown in FIG. 7, it is necessary to work with a large drilling machine in order to drill the anchor hole 109, and to attach the anchor 108. In order to be nervous, work with a large tensing device is required. Since the work position of the drilling machine is on the slope 103 at the lower part of the road 101 and the work of the tensioning device is also on the valley side of the retaining wall 102, a large scaffold is required on the slope 103 for both work. ,
It is expected that the construction cannot be substantially performed or the construction becomes complicated.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a road expansion method and a road expansion method which reduce work on a valley side and are excellent in workability in a method of supporting a wall body with an anchor.

[0008]

According to a first aspect of the present invention, there is provided a road expanding method, wherein a wall is erected on a slope on a valley side, and a lower member serving as a road expanding portion is provided between the wall and the slope. In the road expansion method of expanding the valley side of the road, after anchoring and anchoring the anchor on the mountain side of the road, the anchor and the wall are connected by an anchor in the width direction of the road,
The work associated with the anchoring of the anchoring anchor is performed on the existing road side, and the anchoring anchor and the wall are connected by an anchor in the width direction of the road to support the wall.

In the road expanding structure of the present invention, a wall is erected on a slope on the valley side, and a lower member serving as a road expanding portion is provided between the wall and the slope to cover the valley side of the road. In the road expanding structure to be expanded, the road anchor includes a fixing anchor that is tensioned and fixed to the mountain side of the road, and a road width direction anchor that connects the fixing anchor and the wall body. The anchor is connected to the anchor anchor that is anchored on the mountain side of the road, and the wall is supported by the anchor.

Further, in the road expanding structure according to the third aspect, the lower member is composed of a plurality of styrofoam blocks, and the pressure applied to the back surface of the wall is reduced.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 and 2 show an embodiment of the present invention. As shown in FIG. 1, an existing road 1 is provided between a downward slope 2 on a valley side T and an upward slope 3 on a mountain side Y. It is sandwiched. On the slope 2 of the valley side T, a foundation 4 is formed from cast-in-place concrete, and a wall 5 serving as a retaining wall is continuously formed on the foundation 4 in the longitudinal direction of the road 1. Is a plurality of precast concrete plates 5P, 5P
… Are arranged in the road length direction. In addition, a digging groove 6 for arranging a horizontal anchor described later in the width direction of the road 1 is provided.
To form Further, anchoring anchors 7 called earth anchors and lock anchors are tensioned and fixed to the ground on the mountain side Y of the road 1.

A description will be given of the construction of the anchoring anchor 7. First, an anchor hole 7A whose tip is obliquely downward is drilled on the mountain side Y of the road 1, and this drilling operation is performed by a drilling machine (not shown) arranged on the road 1. Performed by The anchor hole 7A
The anchor PC steel material 8 is inserted into the base material, and the distal end 8S of the PC steel material 8 is fixed by anchor concrete (not shown) or the like. After the anchor concrete is solidified, the base end 8K of the PC steel 8 is tensioned and fixed by a tensioning device (not shown) such as a jack. This tensioning operation is also performed by a tensioning device arranged on the road 1. Also,
The anchors 7 are provided at predetermined intervals in the length direction of the road 1.

Further, in detail, the proximal side 8 of the anchor 8 will be described.
The anchoring of K will be described. As shown in FIGS. 3 and 4, a steel anchor connection pedestal 11 serving as an anchor connection means is disposed on the opening side of the anchor hole 7A. The base end 8K of the PC steel material 8 is inserted into the hole 12A of the central plate 12 located, and the base end 8K is tensioned in the length direction by a predetermined tension by a tensioning device.
A nut 13 serving as a fixing member is screwed into the threaded portion of the K to fix and tighten. The anchor connection pedestal 11 is provided with receiving frames 14, 14 in the longitudinal direction of the road 1 at an up-down interval, and this receiving frame 14 is made of U-shaped steel or the like, and has an internal space at intervals in the longitudinal direction. A reinforcing plate 15 is fixed, and a pair of substantially triangular ribs 16, 16 are fixed to the valley side at the center of the receiving frames 14, 14, and these ribs 16, 16 are fixed.
The central support plate 12 is fixed to the 16 oblique sides 16A, 16A. A pair of substantially rectangular ribs 17 and 17 are fixed to the center of the receiving frames 14 and 14 on the mountain side, and a receiving plate 18 is fixed to the mountain side of the ribs 17 and 17. Has a notch 19 through which the fixing anchor 7 is inserted. Therefore the backing plate 18
The fixing anchor 7 can be tensed by restricting the movement to the mountain side by, for example, contacting the fixing anchor 7 with the opening side of the anchor hole 7A. Left and right support plates 20, 20 are fixed to left and right of the upper and lower receiving frames 14, 14, respectively. The support plate 20 is provided with a hole 20A through which a later-described horizontal anchor is inserted. I have.

A plurality of styrofoam blocks 21 are horizontally arranged between the wall 5 and the inclined surface 2 and are stacked in a plurality of layers to form a lower member 23 of the road expanding portion 22. Holes 5A, 5A are formed in the upper part of the wall body 5 in correspondence with the holes 20A, 20A, and the hill-side end 24Y of the horizontal anchor 24 as an anchor made of PC steel or the like is fixed to a nut as a fixing member. 25, the anchor 24 is fixed to the anchor connecting pedestal 11, the valley-side end 24T of the horizontal anchor 24 is inserted into the hole 5A of the wall 5 and the supporting plate 26, and the nut 27 as a fixing member
Is screwed and fixed. In this case, the valley side end 24T of the horizontal anchor 24 may be pulled toward the valley side to apply a predetermined tension, and then the nut 27 may be screwed into the nut. You may make it fix. In addition, since the horizontal anchor 24 is connected to the upper portion of the wall body 5 in this manner, a structure advantageous for preventing falling is obtained. further,
1 between the inclined surface 2 and the Styrofoam block 21.
As shown in the figure, a backing material 28 such as concrete, mortar, earth and sand is filled as necessary. In addition, road extension 22
Is flat, and an expanded road surface 29 is formed thereon by cast-in-place concrete or pavement material. Incidentally, the excavation groove 6 is provided with two horizontal anchors 24, 24 as shown in FIG.
It is excavated to a width that allows placement of the existing roads.
Can be recovered.

Next, a construction procedure in the above road expansion structure will be described. An excavation groove 6 is formed, and the anchor anchor 7 is tensioned and fixed on the mountain side Y. In this tension fixing, the drilling machine and the tensioning device are arranged on the road 1 to perform work. On the other hand, on the valley side T, after forming the foundation 4, the lower part is fixed to the foundation 4 to form the wall 5, and the lower member 23 is formed by the styrene foam block 21. Next, after arranging the horizontal anchor 24 and before arranging the horizontal anchor 24, even before screwing the nut 27, it is possible to secure the traffic of the existing road 1 by backfilling the excavation groove 6. Possible, that is, the subsequent construction is only on the mountain side Y of the road 1. And the horizontal anchor 24 is tense as needed,
Alternatively, by tightening the nut 27 which is a fixing member,
Connected to wall 5. In this case, even in the case of tension, the horizontal anchor 24 requires less tension than the anchoring anchor 7, so that the tension device such as a jack used for the horizontal anchor 24 can be small, and the extended road surface 29 can be formed to form the expanded road surface 29. Expansion is completed. In addition, the backing material 28 can be applied when stacking the Styrofoam block 21 as necessary, or can be filled after the Styrofoam block 21 is stacked, or the Styrofoam block 21 is cut to fill the gap. You may. And in the road expansion structure constructed in this way, since the upper part of the wall 5 is connected to the fixing anchor 7 which is a permanent anchor via the horizontal anchor 24, it is possible to prevent the wall 5 from tipping over. it can. Also, a styrofoam block is provided on the back of the wall 5.
Since the 21 layers are provided, the earth pressure (back pressure) applied to the wall 5 can be reduced.

As described above, in this embodiment, the wall 5 is erected on the inclined surface 2 on the valley side T according to the first aspect.
In the road expanding method of expanding the valley side T of the road 1 by providing a lower member 23 serving as the road expanding portion 22 between the road and the inclined surface 2, the anchor anchor 7 is tensioned and fixed to the mountain side Y of the road 1. Since the road anchoring method is a road expansion method in which the anchor 7 and the wall 5 are connected by the horizontal anchor 24 in the width direction of the road, the work associated with the anchoring of the anchor 7 is performed on the existing road 1 side, and the anchor 7 and the wall are connected. Since the wall 5 is supported by connecting the body 5 with the horizontal anchor 24 in the width direction of the road 1, work on the valley side T is reduced, and workability can be improved.

As described above, according to the present embodiment, the wall 5 is erected on the inclined surface 2 on the valley side T.
In the road expanding structure for extending the valley side T of the road 1 by providing a lower member 23 serving as the road expanding portion 22 between the road and the inclined surface 2, the anchoring anchor 7 tensioned and fixed to the mountain side Y of the road 1.
Since the road expansion structure is provided with a horizontal anchor 24 in the width direction of the road connecting the anchor 7 and the wall 5, the wall 5 is fixed to the mountain side Y of the road 1 by the horizontal anchor 24 in the width direction of the road. Connected to the anchor anchor 7
Since the wall 5 is supported by the anchors 7, the horizontal anchor 24 can prevent the wall 5 from tipping over, so that the wall 5 can be made thinner and the base 4 below it can be made smaller.

Further, as described above, in the present embodiment, claim 3
Accordingly, since the lower member 23 is composed of a plurality of styrofoam blocks 21, the back pressure of the wall 5 is reduced, and the thickness of the wall 5 is reduced and the size of the lower foundation 4 is reduced. Can be. Further, since the Styrofoam block 21 is lightweight, it is excellent in workability as compared with the conventional backfill by embankment or the like.

Further, as an effect of the embodiment, since the wall body 5 is formed by the plurality of precast concrete plates 5P, the construction becomes easy. In addition, by using the anchor connection base 11, the connection between the anchoring anchor 7 and the horizontal anchor 24 can be easily performed.
11 connects the horizontal anchors 24, 24 to both sides of the anchoring anchor 7, so that a stable connection structure can be obtained.
Further, since the ribs 17 and the receiving plates 18 are provided so as to protrude toward the mountain side of the connecting pedestal 11, these become spacers, and the horizontal anchors 24 are provided.
The screwing operation of the nut 25 to the nut can be easily performed.

The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the present invention. For example, the horizontal anchor may be a PC steel wire, a wire, a cable or the like other than the PC steel material, and the horizontal anchor may be arranged diagonally. Also,
Various anchor connecting means can be used. Further, the expanded road surface may be made of a precast concrete slab. Further, the fixing member of the anchor is not limited to the nut, and various members can be used. Further, in the first and second aspects, the lower member may be configured by embankment between the wall body 5 and the inclined surface 2.

[0021]

According to the road expanding method of the first aspect, a wall is erected on an inclined surface on the valley side, and a lower member serving as a road expanding portion is provided between the wall and the inclined surface to provide a valley of the road. In the road expanding method of expanding the side, after anchoring the anchor on the mountain side of the road, the anchor is connected to the wall by an anchor in the width direction of the road, and the wall is supported by the anchor. In, reduce the work on the valley side,
A road expansion method excellent in workability can be provided.

According to a second aspect of the present invention, a wall is erected on a slope on the valley side, and a lower member serving as a road extension is provided between the wall and the slope to provide a valley side of the road. In a road expanding structure for expansion, a fixing anchor which is tensioned and fixed on a mountain side of a road, and a road width direction anchor connecting the fixing anchor and the wall are provided, and the wall is supported by the anchor. In this case, the work on the valley side can be reduced, and a road expansion structure having a stable structure with excellent workability can be provided.

According to a third aspect of the present invention, the lower member is formed of a plurality of styrofoam blocks, the pressure applied to the mountain side of the wall can be reduced, and the wall is supported by the anchor. In this case, the work on the valley side can be reduced, and a road expansion structure having a stable structure with excellent workability can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view of a road expanding structure showing one embodiment of the present invention.

FIG. 2 is a cross-sectional view in a construction step showing one embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of an anchor connecting means showing one embodiment of the present invention.

FIG. 4 is a plan view of an anchor connecting means showing one embodiment of the present invention.

FIG. 5 is a cross-sectional view of a conventional road expanding structure using a retaining wall.

FIG. 6 is a sectional view of a road expansion structure using a conventional concrete slab.

FIG. 7 is a cross-sectional view of a conventional road expanding structure using a retaining wall provided with a fixing anchor.

[Explanation of symbols]

 1 Road (existing road) 2 Slope 5 Wall 7 Anchor anchor 21 Styrofoam block 22 Road extension 23 Lower member 24 Horizontal anchor

Claims (3)

(57) [Claims] 1. A road expansion method in which a wall is erected on a slope on a valley side and a lower member serving as a road expansion portion is provided between the wall and the slope to expand a valley side of the road. A road expanding method, wherein the anchoring anchor is tensioned and anchored on the mountain side of the road, and the anchoring anchor and the wall are connected by an anchor in the width direction of the road. 2. A road expansion structure in which a wall is erected on a slope on a valley side and a lower member serving as a road expansion portion is provided between the wall and the slope to expand the valley side of the road. A road expansion structure comprising: an anchor anchored and fixed to a mountain side of a road; and a road width direction anchor connecting the anchor and the wall. 3. The road expanding structure according to claim 2, wherein said lower member comprises a plurality of styrofoam blocks.