JP4599322B2 - Slope protection structure - Google Patents

Description

  The present invention relates to a slope protection structure.

As the slope protection structure, for example, the invention of JP-A-2001-214450 is known. This slope protection structure is constructed by laying a protection body formed by packing pebbles etc. in a wire mesh bag on the slope, installing a cruciform concrete block on the top surface of this protection body, and placing this concrete block on the slope ground. It is the structure fixed with the permanent anchor which was laid.
JP 2001-214450 A

  However, the slope protection structure described above is not economical because permanent anchors are placed for each concrete block installed on the slope, and the concrete blocks become unstable as the permanent anchors age. There was a problem of becoming.

  The present invention has been made in view of these problems, and an object thereof is to provide an economical and stable slope protection structure.

The slope protection structure to solve the above problems is a prestressed support consisting of a foundation bearing plate installed at the top and bottom of the slope and a shoulder bearing plate installed at the step in the middle of the slope. The pressure plate is fixed with permanent anchors or rock bolts placed on the slope ground, and precast decorative boards are continuously laid on the slope between the prestressed bearing plates, and these precast decorative boards penetrated vertically. It is connected with a connecting member, and the connecting member is tensioned with a predetermined tension force and fixed to the shoulder supporting plate and the base supporting plate to constitute a prestressed supporting plate, and the step portion includes the shoulder supporting plate and the shoulder plate. Are installed adjacent to each other via a precast plate, and a tension material is inserted into an insertion hole communicating with the shoulder support plate, the precast plate, and the shoulder plate, and the tension material is tensioned. And wherein the door. In addition, a back-filling material is filled between the precast decorative board and the slope.

  Compared to the conventional slope protection structure, the permanent anchor can be placed with an interval of more than twice as long, so that an efficient and economical slope protection structure can be obtained. Further, the decorative plate can be stabilized by connecting the decorative plate to the bearing plate with a connecting member, and the construction can be speeded up.

  Hereinafter, the slope protection structure of the present invention will be described with reference to the drawings. As shown in FIG. 1, the slope 1 of the embodiment of the present invention is a stepped object, and in order to prevent the slope 1 from collapsing, a prestressed bearing plate 2 with an appropriate interval in the vertical direction of the slope is provided. That is, the shoulder support bearing plate 2a and the basic bearing plate 2b are installed by the permanent anchor 3, and the precast decorative plate 4 is continuously spread on the slope 1 between these bearing plates 2a and 2b. Are connected by a connecting member 5.

  A basic support plate 2b is installed at the uppermost and lowermost portions of the slope 1, and a shoulder support plate 2a is installed at the step 6 at the intermediate portion. As shown in (1) of FIG. 3, these bearing plates 2a and 2b are formed in a horizontally long shape with precast concrete.

  Connection concave portions 7 are formed on both side portions of the pressure bearing plates 2 a and 2 b, and hoop-like connection bars 8 are arranged in the connection concave portions 7. Accordingly, the support plates 2a and 2b are joined to each other as shown in (2) of the figure by arranging the reinforcing bars 9 in the connecting bars 8 which are overlapped in a ring shape by contacting the side connecting concave parts 7 and 7 with each other. In addition, the grout 10 is filled in the connecting recess 7. As described above, when the plurality of bearing plates 2a and 2b are continuously joined in the lateral direction, a bearing plate having an appropriate length is formed.

  Further, a projecting portion 11 is formed at the front center portion of the bearing plates 2a and 2b, and a fixing hole 12 for fixing the upper end portion of the permanent anchor 3 is formed in the projecting portion 11. Further, four insertion holes 13 for inserting the connecting members are formed in the vertical direction of the bearing plates 2a and 2b. The bearing plates 2a and 2b connected in the lateral direction are fixed by the permanent anchor 3 placed on the slope ground 14 and the upper end of the permanent anchor 3 is inserted into the fixing hole 12 of the protrusion. Has been established.

  As shown in FIG. 4, the permanent anchor 3 is configured by binding a plurality of strands 15 with fixing grips 16, and a bare wire 17 on the tip side is press-fitted into a grout 19 of the excavation hole 18. Then, by applying a predetermined tension force and inserting and fixing the upper end portion into the fixing hole 12 of the bearing plate, a predetermined prestress is applied to the bearing plates 2a and 2b to form the prestressed bearing plate 2. Yes. In addition to this permanent anchor, a lock bolt can also be used.

The upper and lower base bearing plates 2b of the slope 1 have the same shape, but the shoulder supporting plate 2a in the step 6 is formed by attaching a shoulder plate 21 with a PC steel bar (tension material) 20 and this shoulder. A precast decorative board 4 is continuously laid on the slope 1 between the stop bearing plate 2a and the foundation bearing plate 2b.
As is clear from FIGS. 1 and 8, the stepped portion 6 is structured such that the shoulder support plate 2a and the shoulder plate 21 are installed adjacent to each other via the precast plate 30, and the shoulder support plate 2a. A PC steel rod (tensile material) 20 is inserted into an insertion hole 31 in which the precast plate 30 and the shoulder plate 21 communicate with each other, and the PC steel rod 20 is tensioned and fixed.

  The precast decorative board 4 is a precast concrete board having a size of 1 m in length and 2 m in width formed of lightweight concrete, and reinforcing ribs 22 project from the back surface. Further, two through holes 23 through which the connecting member passes are formed in the vertical direction of the precast decorative board 4, and a space 24 for storing the connecting nut is formed above the through hole 23.

  Further, an upper fitting protrusion 25 is formed on the upper surface of the precast decorative board 4, and a lower fitting groove 26 is formed on the lower surface, and the upper fitting of the precast decorative board located on the lower side is formed in the lower fitting groove 26. The mating protrusion 25 is fitted, and the upper fitting protrusion 25 on the upper surface is fitted into the lower fitting groove 26 of the precast decorative board positioned on the upper side, so that the precast decorative boards 4 are joined to each other, and through holes Prestress is applied by 23 connecting members 5.

  The connecting member 5 is a thread-shaped deformed steel bar, but in addition to this, a high-tensile steel material such as a PC steel bar, a PC steel wire, or a PC steel stranded wire is used.

  On the other hand, a semicircular fitting protrusion 27 is formed on one side surface of the precast decorative board 4, and a semicircular fitting groove 28 is formed on the other side surface. The fitting projection 27 of the precast decorative board is fitted, and the fitting protrusion 27 is fitted into the fitting groove 28 of the precast decorative board 4 located on the left side, so that the precast decorative boards 4 are in the lateral direction. They are joined and rotate around the joint.

  In this way, the plurality of precast decorative boards 4 are continuously joined in the vertical and horizontal directions and prestressed by the connecting member 5, thereby forming the precast decorative board 4 as if it were a single board. Further, since the precast decorative boards 4 are rotatable at the joint portions on the side surfaces, the precast decorative boards 4 along the shape of the slope ground pile 14, for example, curved ones can be formed.

  The precast decorative plate 4 that is a single plate is joined to the shoulder support plate 2a and the basic support plate 2b by a connecting member 5. That is, on the upper side, as shown in FIG. 8, the lower end portion of the connecting member 5 is fixed to the shoulder support pressure plate 2a, and the upper end portion is inserted into the insertion hole 13 of the upper basic pressure support plate 2b. The precast decorative plate 4 and the prestressed bearing plate 2 are integrally attached to the slope 1 by applying force and fixing.

  On the other hand, on the lower side, the lower end portion of the connecting member 5 is fixed to the lower basic support plate 2b, and the upper end portion is fixed to the shoulder support plate 2a by applying a predetermined tension, thereby precast makeup. The plate 4 and the prestressed bearing plate 2 are integrally attached to the slope 1.

  Further, a back-filling material 29 is filled between the precast decorative board 4 and the slope 1 to adjust the unevenness of the slope 1. For the backfill material 29, in addition to sand, bubble mixed soil, bubble mixed material, low-strength concrete, and the like are used.

It is a longitudinal cross-sectional view of a slope protection structure. It is a front view of a slope protection structure. (1) is the perspective view of the joined bearing plate, (2) is the top view. It is sectional drawing of a permanent anchor. It is the perspective view which installed the decorative board between the bearing plates. (1) is a front view of a decorative board, (2) is a top view of a decorative board. (1) is a longitudinal cross-sectional view of the joint portion of the decorative board, and (2) is a cross-sectional view in the lateral direction. It is a longitudinal cross-sectional view of a slope protection structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Slope 2 Prestressed bearing plate 2a Shoulder bearing bearing plate 2b Foundation bearing plate 3 Permanent anchor 4 Decorative plate 5 Connection member 6 Step part 7 Connection recessed part 8 Connection reinforcement 9 Reinforcement 10 Grout 11 Projection part 12 Fixing hole 13 Insertion hole 14 Normal surface Natural mountain 15 Strand 16 Anchoring grip 17 Bare wire 18 Drilling hole 19 Grout 20 PC steel bar (tension)
21 shoulder stop plate 22 reinforcing rib 23 through hole 24 space 25 upper fitting protrusion 26 lower fitting groove 27 fitting protrusion 28 fitting groove 29 backfill material 30 precast plate 31 insertion hole

Claims (2)

A prestressed bearing plate consisting of a foundation bearing plate installed at the top and bottom of the slope and a shoulder bearing plate installed at a step in the middle of the slope is a permanent anchor or Fixed with lock bolts,
A precast decorative board is continuously laid on the slope between the prestressed bearing plates,
These precast decorative boards are connected by a connecting member penetrating in the vertical direction,
The connecting member is tensioned with a predetermined tension force and is fixed to the shoulder supporting pressure plate and the basic supporting pressure plate to constitute a prestressed supporting pressure plate ,
In the step portion, a shoulder support plate and a shoulder plate are installed adjacent to each other via a precast plate, and a tension material is inserted into an insertion hole that connects the shoulder support plate, the precast plate, and the shoulder plate. A slope protection structure characterized by tensioning the tendon . The slope protection structure according to claim 1, wherein a backfilling material is filled between the precast decorative board and the slope.

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