JPH0733645B2 - Avalanche stone protection structure - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a protective structure for avalanche rocks, etc. for protecting roads, tracks, etc. in mountainous areas from avalanches, rockfalls, landslides, and the like.

[Prior Art] Conventionally, a structure of a protective body such as an avalanche stone installed between a slope of a mountain such as a cliff and a road or a railroad is shown in FIG. The main girders 3 forming a wall body for receiving avalanche stones and the like are erected on the pillars 2 in parallel in the longitudinal direction of the roads, and the central portion of the main girders is fixed to the pillars 2. In addition, the end portion of the main girder 3 is inserted into and supported by the anchor bolt 4 projecting from the substructure 1.

[Problems to be Solved by the Invention] In the above-mentioned conventional technique, a load such as an avalanche or a rock fall applied to the main girder 3 is configured to be supported by the substructure 1 and the pillar 2. For this reason, there is a problem that the area L branch road 5 in which the pillar 2 is installed becomes narrow and it is difficult to secure the installation area of the pillar 2 in a place where the slope gradient α of the mountain is large. Further, even if the column 2 is not used, it is impossible to support the load applied to the main girder 3 at the connecting portion between the substructure 1 and the main column 3.

Therefore, the present invention makes it possible to provide a sufficient load resistance without providing a column, and to firmly integrate a plurality of main girders in the road length direction and firmly fix the main girders to a support wall. The objective is to provide a protective structure such as avalanche rocks that can be used.

[Means for Solving the Problems] The present invention is directed to a girder portion and a girder that are continuous to the road-side lower surface and the mountain-side lower surface of a substantially flat plate-shaped upper flange in the road length direction and project downward from the lower surface. Girders made of precast concrete with integral parts, a wall body that receives avalanche stones formed by arranging multiple main girders side by side in the length direction of the road, and this wall body on the mountain wall Anchor in the width direction of the road, a support wall provided under the girder portion formed along the wall portion of the mountain, and the wall body provided on the girder portion and PC-fixed to the support wall In a protection structure such as an avalanche stone with a vertical tightening PC steel material, the anchor is fixed to the wall portion of the mountain and fixed to a concrete pedestal provided along the wall portion of the mountain. Between the side of the road and the side of the mountain of the large beam part The pre-stress in the road length direction is introduced into the wall body by the horizontal tightening PC steel rods inserted into the center of the beam across the beam and the center of the road across the beam. The vertical tightening rocking PC steel materials are respectively provided on the road side and the mountain side of the girder portion with a horizontal tightening PC steel rod inserted through the portion.

[Operation] With the above structure, the wall body is fixed to the mountain wall portion by the anchor in the road width direction, and for vertical tightening provided on the road side and the mountain side with the PC steel rod for horizontal tightening inserted through the girder part sandwiched therebetween. Since the PC is fixed to the support wall by the PC steel material, the wall body can be firmly integrated with the support wall, and a sufficient load bearing capacity can be obtained with the support structure having no columns. In addition, the prestress is introduced in the length direction of the road by the PC steel rod inserted into the large and small beam parts, so that the wall body composed of multiple main girders is firmly integrated.

[Embodiment] An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 1 to 4, 11 is a main girder made of precast prestressed concrete, so-called PC precast concrete. The main girder 11 has a substantially flat plate-like upper flange 12, a web 13 and a road side beam portion 14. And a girder side large beam portion 15 form a structure in which a T-shaped cross section is continuous in the longitudinal direction, and the small beam portion 14 and the large beam portion 15 are the upper flanges.
Provided so as to project downward from the lower surface of 12, a plurality of main girders 11 are juxtaposed in a state of abutting, and laterally inserted into the center of the beam portion 14 in the road width direction and the center of the girder portion 15 in the road width direction. A wall body 17 in which prestress is introduced is formed by tightly connecting the small beam portion 14 and the large beam portion 15 with the tightening PC steel rod 16. 18 is an anchor made of PC steel material consisting of a ground anchor or a lock anchor etc. deeply fixed in the wall 19 of the mountain, and this anchor 18 is first fixed to the concrete pedestal 26 and then to the anchor 18. An anchor 18B is connected by a connector 18A, the anchor 18B is passed through 13 webs of the main girder 11, and the anchor head 20 is tightly integrated to introduce prestress to the main girder 11. in this case,
As shown in FIG. 5, the anchor 18 may be passed through the girder portion 15 of the main girder 11 and tightly connected by the anchor head 20.

Reference numeral 21 is an I-shaped substructure that is a support wall formed of cast-in-place concrete along the mountain wall portion 19. The substructure 21 has two vertical fastenings on the road width direction, that is, on the road side and on the mountain side. PC steel material 22 for embedded is embedded, and these PC steel materials 22 for vertical fastening penetrate the large beam portion 15 of the main girder 11 by sandwiching the PC steel rod 16 inserted in the large beam portion 15 and tightly integrated by a fastening member 23. Prestressing is applied to the underside of the girder part 15.
PC is fixed at 21. 24 is an enclosure block made of precast concrete, 25 is earth and sand for impact relaxation laid on the upper surface of the wall 17, 26 is a concrete pedestal, 27 is a stuffed concrete section, and 28 is a roadway. And as you can see in the drawing,
The filling concrete portion 27 is provided between the road side surface 26A of the pedestal 26 and the mountain side surface 15A of the girder portion 15.

Then, the main girder 11 is manufactured at the factory, the main girder 11 is transported to the site, and the substructure 21 is constructed on-site by pouring concrete.
An anchor 18B is connected to the anchor 18 fixed by means of a connecting tool 18A, the main girder 11 is fixed to the anchor 18B, and prestress is introduced into the main girder 11. Also, the girder of the main girder 11
Fix 15 with PC by vertical fastening PC steel material 22 of substructure 21 and main girder
Pre-stress is introduced to 11 and the beam part of each main girder 11
A wall body (17) is formed by tightly binding and integrating with a horizontal fastening PC steel rod (16) inserted into the girder portion (14).

As described above, in the above-described embodiment, the wall body 17 that directly receives a load such as an avalanche or a rock fall is fixed to the mountain wall portion 19 by the anchor 18 in a prestressed state, and the wall body 17 is connected to the road side. Since the PC is settled on the substructure 21 by the PC steel material 22 for vertical tightening provided on the mountain side, the pillar 2 as shown in FIG.
Although it has no structure, the wall 17 can have a sufficient load resistance, especially for lateral tightening inserted in the center of the girder portion 15.
By installing the PC steel rods 22 for vertical tightening on both the road side and the mountain side with the PC steel rods 16 sandwiched between them, integration of the wall steel 17 by the horizontal tightening PC steel rods 16 by introducing prestress in the road length direction can be achieved. The fixation of the wall body 17 to the substructure 21 by the vertical tightening PC steel rod 22 can be performed in parallel and firmly. As a result, it is possible to widen the installation area L minute roadway 28 of the pillar 2, and to easily install the protective structure even on the roadway 28 having a small width. Further, since it is not necessary to secure the installation area for the pillar 2, the substructure 21 can have an I-shaped structure instead of the L-shaped shown in FIG. 6, and as a result, even if the slope slope α of the mountain is steep, The wall 17 can be installed, and the substructure 21 can be easily cast on site according to the state of the slope of the mountain. Further mountain wall
Anchor 18 is fixed to a concrete pedestal 26 provided along 19 and road side 26A of pedestal 26 and mountain side 1 of girder portion 15
By providing the interstitial concrete part 27 between 5A,
The main girder 13 can be installed on the support wall 21 so that the distance between the road side surface 26A of the pedestal 26 and the mountain side surface 15A of the girder portion 15 is matched.

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 shape of walls, supporting walls, PC steel and anchors,
The size and type may be appropriately selected.

[Advantages of the Invention] The present invention integrates a beam portion and a girder portion, which are continuous to the road-side lower surface and the mountain-side lower surface of a substantially flat plate-shaped upper flange in the road length direction and project downward from the lower surface, respectively. The main girders made of precast concrete, the wall body that receives avalanche stones formed by arranging multiple main girders side by side in the longitudinal direction of the road, and the road width that secures this wall body to the mountain wall. Direction anchor, a supporting wall provided below the girder portion formed along the wall portion of the mountain, and a vertical tightening PC steel material for fixing the wall body provided on the girder portion to the supporting wall by PC. In a protection structure such as an avalanche stone equipped with, the anchor is fixed to a wall portion of the mountain and is fixed to a concrete pedestal provided along the wall portion of the mountain, and the side surface of the pedestal and the girder. A squeezed concrete section is provided between the mountain side of the section,
The pre-stress in the road length direction is introduced into the wall body by the horizontal tightening PC steel rods inserted in the center of the cross beam in the road width direction and the center of the cross beam in the road width direction, respectively. The vertical tightening PC steel material is respectively provided on the road side and the mountain side of the girder portion with the tightening PC steel rod interposed therebetween, and it is possible to provide a sufficient load resistance without providing a pillar, and a plurality of While firmly integrating the main girder in the length direction of the road,
It is possible to provide a protection structure such as an avalanche rock that can firmly fix the main girder to the support wall.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention, FIG. 1 is a partially cutaway side view, FIG. 2 is a perspective view, FIG. 3 is a sectional view showing an anchor fixing state, and FIG. FIG. 5 is a cross-sectional view showing a PC fixing state by a vertical fastening PC steel material, FIG. 5 is a cross-sectional view showing another embodiment example, and FIG. 6 is a partially cutaway side view showing a conventional example. 11 ... Main girder 14 ... Large beam 15 ... Large beam 15A ... Mounting side 16 ... Horizontal fastening PC steel rod 17 ... Wall 18 ... Anchor 19 ... Mounting wall 21 ... Substructure (supporting wall) 22 ... Vertical fastening PC steel 26 ... Pedestal 26A ... Road side 27 ... Filled concrete section

Continued Front Page (72) Yoshiharu Goto Inventor Yoshiharu Goto 1-8-23 Bentenbashi-dori, Niigata City, Niigata Nihon Samicon Co., Ltd. Structural Technology Co., Ltd. (56) Reference JP-A-1-244003 (JP, A)

Claims (1)

[Claims] 1. A precast in which a beam portion and a girder portion, which are continuous with the road-side lower surface and the mountain-side lower surface of the substantially flat plate-shaped upper flange and which extend downward from the lower surface, are integrally provided on the road-side lower surface and the mountain-side lower surface. A main girder made of concrete, a wall body formed by arranging a plurality of main girders side by side along the length of the road to receive avalanche stones, etc., and an anchor in the road width direction that anchors this wall body to the mountain wall And a supporting wall formed along the wall portion of the mountain and provided at a lower portion of the girder portion, and a vertical tightening PC steel material that is provided on the girder portion and PC-fixes the wall body to the supporting wall. In a protection structure such as an avalanche rock, the anchor is fixed to the wall portion of the mountain and fixed to a concrete pedestal provided along the wall portion of the mountain, and the road side surface of this pedestal and the mountain side surface of the girder portion. A small concrete block is provided between the The pre-stress in the road length direction is introduced into the wall by the PC steel rods for lateral fastening inserted in the center of the width direction and the center of the girder in the width direction of the road, respectively. A protection structure for avalanche stones, characterized in that the PC steel materials for vertical tightening are provided on the road side and the mountain side of the large beam, respectively.