JP6188386B2 - Shed buffer structure - Google Patents

Description

  The present invention relates to a shed buffer structure in which a buffer layer is laminated on a top plate of a rock shed or a snow shed.

In recent years, on coastal roads and roads along mountains, there are places where rock sheds for protecting roads and vehicles from falling rocks and snow sheds for protecting against snowfall are provided.
In order to protect the top plate of the shed, a buffer layer is provided on the top plate. As the buffer layer provided on the top plate, a lightweight foam is used instead of heavy sand in order to reduce the weight of the buffer layer itself from the strength of the top plate.
As a cushioning structure in which the foam is provided on the top plate of the shed, a polystyrene foam block is placed on the top plate (Patent Document 1), or a polyurethane foam raw material is sprayed on the top plate to form a polyurethane foam on the top plate. (Patent Document 2).

However, in the structure in which the expanded polystyrene block is placed on the top plate, the expanded polystyrene block is easily displaced from the top plate due to impact, etc., and the expanded polystyrene is processed according to the size and unevenness of the top plate during construction. There is a problem that processing takes time and labor.
On the other hand, in a structure in which a polyurethane foam is formed on the top plate by spraying a polyurethane foam raw material on the top plate, the polyurethane foam formed on the top plate may warp due to shrinkage after foaming, or may be displaced due to impact, etc. There is a risk.

JP 2004-036266 A JP 10-266138 A

  The present invention has been made in view of the above points, and can form a polyurethane foam on the top plate of the shed with good workability, and the polyurethane foam formed on the top plate is less likely to be displaced or warped. The purpose is to provide a buffer structure.

According to a first aspect of the present invention, in the shed cushioning structure in which a polyurethane foam raw material is sprayed on the top plate of the shed and polyurethane foam is laminated on the top plate, reinforcing bars are erected at a plurality of locations on the top plate, Auxiliary reinforcing bars are fixed so as to intersect with the reinforcing bars protruding to the top plate, and the auxiliary reinforcing bars are embedded in the polyurethane foam together with the reinforcing bars protruding on the top plate .

The invention of claim 2 is characterized in that, in claim 1 , the upper end position of the reinforcing bar is equal to the upper surface position of the polyurethane foam after foaming.

The invention of claim 3 is the invention according to claim 1 or 2 , wherein the reinforcing bar is also erected on a ground mountain portion adjacent to the top plate, and the polyurethane foam is spread from the top plate to the ground mountain portion adjacent to the top plate. The reinforcing bar is laminated, and the reinforcing bar protruding from the top plate and the reinforcing bar protruding from the ground are embedded in the polyurethane foam.

The invention of claim 4 is characterized in that, in claim 3 , the lower end of the reinforcing bar is embedded deeper in the natural ground portion than in the top plate portion.

  According to the invention of claim 1, since the reinforcing bars erected at a plurality of locations on the top surface of the top plate are embedded in the polyurethane foam on the top surface of the top plate, the polyurethane foam shifts and warps after foaming of the polyurethane foam. Can be prevented by reinforcing bars.

According to the first aspect of the present invention, the auxiliary reinforcing bar is fixed to the reinforcing bar so as to cross the reinforcing bar, and the auxiliary reinforcing bar is embedded in the polyurethane foam together with the reinforcing bar, so that the polyurethane foam is displaced and the polyurethane foam is warped. Can be further enhanced. In particular, the auxiliary reinforcing bars provided so as to cross the reinforcing bars are highly effective in preventing warping of the polyurethane foam.

According to the invention of claim 2 , since the upper end position of the reinforcing bar erected on the upper surface of the top plate is equal to the upper surface position after foaming of the polyurethane foam, the polyurethane foam material is sprayed onto the top plate upper surface. When the layers are sequentially laminated, it is easy to grasp the finished height (thickness) of the polyurethane foam, and the construction work is facilitated.

According to the invention of claim 3, since the reinforcing bars are erected in the natural ground portion adjacent to the top plate and the reinforcing bars are embedded in the polyurethane foam laminated on the natural ground portion, the displacement of the polyurethane foam is also observed in the natural ground portion. Further, warping after foaming of the polyurethane foam can be prevented.

According to the invention of claim 4 , since the lower end of the reinforcing bar is buried deeper than the top plate part in the natural mountain part, the reinforcing bar can be prevented from coming out of the natural mountain part, and in the soft natural mountain part compared to the top plate. Also, it is possible to effectively prevent the polyurethane foam from being displaced and the warping of the polyurethane foam after foaming.

It is sectional drawing which shows the buffer structure of the shed in one Embodiment of this invention. It is sectional drawing which shows before lamination | stacking of the polyurethane foam in the same embodiment. It is the A arrow directional view which looked at the top plate upper surface in FIG. 2 from upper direction. It is A arrow line view which shows the other example of an auxiliary reinforcing bar.

  Hereinafter, embodiments of the shed buffer structure according to the present invention will be described with reference to the drawings. A shed 10 shown in FIG. 1 is a rock shed or a snow shed formed on a road 50 along a mountain. In the shed 10, the top plate 17 is supported by the road retaining wall 13 erected on the natural mountain portion 51 side and the pillar 15 erected on the edge of the valley of the road 50. The top plate 17 is configured by placing concrete on the upper surface of a corrugated steel plate. Examples of the thickness (height) of the top plate 17 include 50 to 100 cm. A waterproof layer (not shown) made of a plastic sheet or the like is laid on the top surface of the top plate 17.

  Reinforcing bars 21 are erected at predetermined intervals on the top surface of the top plate 17 and the top surface of the ground portion 52 adjacent to the top plate 17. The reinforcing bars 21 are made of iron bars having a predetermined diameter and length (height), and as shown in FIGS. They are erected at predetermined intervals in a direction (road width direction) a and a horizontal direction (road length direction) b. Examples of the reinforcing bar 21 include a diameter of 10 to 19 mm and a length of 50 to 150 cm. A deformed reinforcing bar is preferable. Examples of the distance c in the vertical direction a and the distance d in the horizontal direction b are 50 cm to 500 cm. In particular, within the range where the polyurethane foam 31 described later is provided, the reinforcing bars 21 are erected near the valley side edge of the top plate 17 and the mountain side edge of the natural mountain portion 52, for example, within a portion within 50 cm from the edge. Is preferred. In the illustrated example, the rebar 21 is erected in a vertical direction with respect to the top surfaces of the top plate 17 and the natural ground portion 52 inclined to the valley side. The vertical direction is not limited to the vertical direction (for example, a vertical direction or a vertical direction with respect to the road surface).

  The embedding depth of the lower end of the reinforcing bar 21, that is, the standing depths e and f (shown in FIG. 2) is deeper in the ground portion 52 than the top plate 17 and is made of softer soil than the top plate 17. In the natural ground portion 52, the reinforcing bars 21 are prevented from coming out of the natural ground portion 52 due to stress that causes warping or displacement of the polyurethane foam 31 described later. As an example of the standing depths e and f of the reinforcing bars 21, the depth e of the top plate 17 portion is 5 to 20 cm, and the depth f of the natural mountain portion 52 is [depth of the top plate 17 portion e + 10 to 50] cm. Here is an example.

  An auxiliary reinforcing bar 25 is fixed to the reinforcing bar 21 so as to intersect the reinforcing bar 21 at a position embedded in a polyurethane foam 31 described later, that is, a portion protruding from the top plate 17 and the natural ground portion 52. The auxiliary reinforcing bars 25 are fixed to the reinforcing bars 21 by wire, welding or the like so as to have a cross shape. Further, the number of auxiliary reinforcing bars 25 fixed to each reinforcing bar 21 is not limited to one as shown in FIG. 3, and two auxiliary reinforcing bars 25, 25 are provided for one reinforcing bar 21 as shown in FIG. 4. For example, the vertical direction a and the horizontal direction b may be fixed. Examples of the auxiliary reinforcing bar 25 include a diameter of 10 to 19 mm and a length of 30 to 100 cm. A deformed reinforcing bar is preferable. Further, the height position of the auxiliary reinforcing bar 25 with respect to the reinforcing bar 21 is preferably in the vicinity of the middle position between the upper end and the lower end of the reinforcing bar 21 protruding from the top plate 17 and the natural ground portion 52. As an example, the lower end ( A position 30 cm from the top plate 17 and the upper surface of the natural ground portion 52) is given. The auxiliary reinforcing bars 25 shown in the figure are separate for each of the reinforcing bars 21, but long ones that can be spanned over a plurality of reinforcing bars 21 are used. You may fix to the said reinforcing bar 21 in multiple places combining in a grid | lattice form to a direction and a horizontal direction.

  As shown in FIG. 2, a polyurethane foam raw material 31A is sprayed on the top surface of the top plate 17 and the natural mountain portion 52 where the reinforcing bars 21 are erected, and the polyurethane foam raw material 31A is foamed to form a polyurethane foam layer. Then, the polyurethane foam raw material 31A is sprayed again and the polyurethane foam layer is formed again, and this is repeated a predetermined number of times, and the polyurethane foam layer is sequentially laminated on the top surface of the top plate 17 and the ground portion 52. Finally, a polyurethane foam 31 having a predetermined thickness (height) as shown in FIG. 1 is formed. At that time, the polyurethane foam raw material 31 </ b> A is made so that the finished height (final height) of the polyurethane foam 31 coincides with the upper end positions of the reinforcing bars 21 protruding from the top surfaces of the top plate 17 and the ground portion 52. Spraying and laminating polyurethane foam. Further, when a plurality of polyurethane foam layers are laminated on the top surfaces of the top plate 17 and the natural ground portion 52, the reinforcing bars 21 and the auxiliary reinforcing bars 25 protruding from the top plate 17 and the natural ground portion 52 are polyurethane foamed. Embedded in the body 31. As the polyurethane foam raw material, a known raw material for rigid polyurethane foam is used. In some cases, a retaining wall 19 is erected on the top end of the top surface of the top plate 17 to prevent the polyurethane foam raw material from flowing out.

  Thereafter, a concrete protective layer 35 is provided on the upper surface of the polyurethane foam 31. Even if a shrinkage stress after foaming acts on the polyurethane foam 31 or a stress that causes warping is applied to the polyurethane foam 31, the shed cushioning structure constructed in this way is from the top plate 17 and the natural ground portion 52. Since the protruding reinforcing steel bars 21 are embedded in the polyurethane foam 31, the polyurethane foam 31 can be prevented from shifting or warping. Moreover, since the auxiliary reinforcing bars fixed so as to intersect the reinforcing bars 21 are also embedded in the polyurethane foam 31, the effect of preventing the polyurethane foam 31 from being displaced or warped can be further enhanced.

  Furthermore, since the lower end of the reinforcing bar 21 is embedded deeper in the natural ground portion 52 than in the portion of the top plate 17, shrinkage stress after foaming acts on the polyurethane foam 31, and stress causing warping acts on the polyurethane foam 31. Even so, it is possible to prevent the reinforcing bars 21 from coming off from the natural ground portion 52, and to effectively prevent the polyurethane foam 31 from being displaced and warped even in the soft natural ground portion 52 compared to the top plate 21. it can.

10 Shed 17 Top plate 21 Reinforcement 25 Auxiliary rebar 31 Polyurethane foam 52 Natural ground part adjacent to top plate

Claims (4)

In the shed cushioning structure in which the polyurethane foam is laminated on the top plate by spraying a polyurethane foam raw material on the top plate of the shed,
Reinforcing bars are erected at a plurality of locations on the top surface of the top plate , the auxiliary reinforcing bars are fixed so as to intersect with the reinforcing bars protruding on the top plate, and the auxiliary reinforcing bars are embedded in the polyurethane foam together with the reinforcing bars protruding on the top plate . A shed buffer structure characterized by that. The shed cushioning structure according to claim 1 , wherein an upper end position of the reinforcing bar is equal to an upper surface position of the polyurethane foam after foaming . The reinforcing bar is also erected on a ground part adjacent to the top plate, the polyurethane foam is laminated from the top plate to the ground part adjacent to the top plate, and the reinforcing bar protruding from the top plate and the ground part 3. The shed cushioning structure according to claim 1 , wherein a reinforcing bar projecting from the embedment is embedded in the polyurethane foam . 4. The shed cushioning structure according to claim 3 , wherein a lower end of the reinforcing bar is embedded deeper in the natural mountain portion than in the top plate portion .

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