Connection structure of foundation block

Abstract

To provide a connection structure of a foundation block which is simple in structure, facilitates connection work, and ensures sufficient strength performance and deformation performance in a connection part.SOLUTION: A connection structure of a foundation block includes a block main body, a first plane formed at the central part of one end of the block main body, a pair of first angle regulating sidewalls formed to sandwich the first plane, a second plane formed at the central part of the other end of the block main body, a pair of second angle regulating sidewalls formed to sandwich the second plane, a columnar protrusion projecting from the block main body, a recess fitted to the protrusion and slidable, and a flat-plate connecting member mounted on the second flat-plane of a foundation block adjacent to the first plane, having a first fitting hole at a part opposed to the first plane and a second fitting hole at a part opposed to the second plane. A first support part is formed on the first plane, a second support part is formed on the second plane, the first support part rotatably supports the first fitting hole of the flat plate part, and the second support part rotatably supports the second fitting hole.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an improvement of a foundation block installed along the boundary of the ground surface such as a road. This foundation block supports a guardrail, and a column such as a guardrail is inserted and fixed into a hole formed on its upper surface. This foundation block is placed on the road surface and used.

Background Art

[0002] Making this foundation block the same length as the guardrail is not realistic from the perspective of its weight. Therefore, this foundation block is made in relatively short (for example, 3 m) units, and by connecting these in the longitudinal direction, it is possible to support a long guardrail. When a vehicle or the like contacts or collides with the guardrail and the foundation block itself, although the foundation block is movable with respect to the road surface, if it is fixed in its connection direction, the guardrail is likely to be greatly deformed. In other words, by bending of the foundation block at its connection part, deformation of the guardrail can be suppressed. On the other hand, if the connecting block freely bends at the connection part, the original function of the guardrail is impaired, so a limit is provided to the bending at the connection part.

[0003] There is one disclosed in Patent Document 1 as such a foundation block. This foundation block has connection parts formed at both ends of a concrete square columnar block body. A semi-cylindrical convex part is formed at the connection part on one end side, and a concave part is formed at the connection part on the other end side, and the convex part is slidably fitted with the concave part of the foundation block of the connection partner. A pin projects horizontally from the side wall of the concave part, passes through a slit formed in the side wall of the convex part, and its tip is rotatably fixed inside the convex part. Thereby, the connected foundation blocks can rotate around the tip of the pin and thus can bend.

[0004] On both sides of the convex portion at one end of the block body, first angle regulating side walls are formed, and on both sides of the concave portion at the other end, second angle regulating side walls are formed. As a result, when the connected foundation blocks are bent at their connection part, one of the first angle regulating side walls of the foundation block interferes with the second angle regulating side wall facing it in the other foundation block, restricting further bending.

[0005] In the foundation block disclosed in Patent Document 2, inclined surfaces are formed on the convex and concave portions on the end face of the block body, and the block bodies are connected using a connecting plate refracted along these inclined surfaces.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0007] In the connection structure of the foundation block described in Patent Document 1, since slits are provided on the peripheral wall of the convex portion and the tip of the pin from the concave portion needs to be rotatably fixed within the convex portion, the structure becomes complicated. In the connection structure of the foundation block described in Patent Document 2, sufficient volume cannot be ensured for the convex portion to secure the inclined surface. Therefore, there is a possibility that the strength performance at the connection part becomes insufficient.

Means for Solving the Problems

[0008] This invention was made to solve the above problems, and its first aspect is defined as follows. That is, A connection structure of foundation blocks arranged along the boundary of the ground surface, a block body, A first flat surface formed at one end of the block body and a pair of first angle restricting side walls formed so as to sandwich the first flat surface, A second flat surface formed at the other end of the block body and a pair of second angle restricting side walls formed so as to sandwich the second flat surface, and the second flat surface is formed on the same plane as the first flat surface, A columnar convex portion formed on the first flat surface and protruding from the block body, A concave portion formed on the second flat surface and slidably fitted with the convex portion, A flat plate-shaped connecting member placed on the second flat surface of the base block adjacent to the first flat surface, the connecting member having a first fitting hole in a portion facing the first flat surface and a second fitting hole in a portion opposing the second flat surface, A first support portion is formed on the first flat surface, A second support portion is formed on the second flat surface, The first support portion rotatably supports the first fitting hole of the flat plate portion, and the second support portion rotatably supports the second fitting hole, a connecting structure of the base block.

[0009] According to the connecting structure of the base block of the first aspect defined in this way, flat surfaces are respectively formed at both ends of the block body of the adjacent base blocks, and a flat plate-shaped connecting member is rotatably attached to the support portions of each flat surface, ensuring deformation performance. Since the connecting target surface of the connecting member is a flat surface, this flat surface can be formed as close as possible to the upper surface of the block body. Therefore, sufficient volume can be ensured for the convex portion formed at the end of the block body. Therefore, according to the connecting structure of the base block defined in the first aspect, sufficient strength performance can be ensured for the connecting portion. Also, since the connecting member is flat plate-shaped and its mating part is also a flat surface, the construction becomes less laborious.

[0010] In the above, the convex portion is a semi-cylindrical or arc-shaped column with a first radius of curvature, the concave portion is also a curved surface with the same first radius of curvature, and the first support portion is formed at the center of the curved surface defining the outer periphery of the side surface of the convex portion. Thereby, the convex portion can be fitted into the concave portion and the two can be rotationally slid with the first support portion of the convex portion as the center (second aspect).

[0011] Of course, in order to ensure the sliding of both, it is preferable to provide a margin between the first radius of curvature of the convex portion and the first radius of curvature of the concave portion, and make the former shorter than the latter. The convex portion can also be a polygonal prism inscribed in a curved surface with the first radius of curvature. In this case, it is preferable to bring a plurality of corners of the polygonal prism into contact with the concave portion to ensure the sliding of both.

[0012] The third aspect of this invention is defined as follows. That is, In the connection structure defined in the first aspect, when a pair of the base blocks bend at their connection portion, the center of the first fitting hole coincides with the center of the first support portion, and the center of the second fitting hole is offset from the center of the second support portion.

[0013] As described above, adjacent base blocks slide with their convex and concave portions centered on the first support portion. Therefore, the first fitting hole of the connection portion that fits into the first support portion is aligned with the first support portion so that there is no deviation. As a result, the sliding of the convex and concave portions is also performed smoothly. On the other hand, the second fitting hole that fits with the second support portion has a larger diameter than the second support portion, so that the bending force of the base block does not directly act from the second support portion to the connection portion and is released to prevent deformation of the connection portion. By making the second fitting hole into a sector shape along the curved surface of the concave portion, it is also possible to ensure the deviation of the second support portion.

[0014] The fourth aspect of this invention is defined as follows. In the connection structure defined in the first aspect, when adjacent base blocks bend, the first side wall of one block body contacts the second angle regulating side wall of the other block body facing it. Thereby, the bending angle between the base blocks is defined.

[0015] The maximum value of the bending angle is preferably 15 degrees. With this constraint, the maximum entry stroke can be limited to 0.25 m or less. In other words, the included angle between the first angle regulating side wall and the second angle regulating side wall on the opposite side of the contacted first angle regulating side wall and the second angle regulating side wall is 30 degrees (fifth aspect). It is preferable both in terms of design and manufacturing conditions that the first angle regulating side wall and the second angle regulating side wall have an equal included angle (7.5 degrees) with respect to the virtual line L2 (virtual line in the width direction) perpendicular to the central axis of the block body. However, the included angle between the opposing first and second angle regulating side walls may be 15 degrees.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0017] Hereinafter, embodiments of this invention will be described with reference to the illustrations. As shown in Fig. 1, the basic block of the embodiment has connection structures (the first connection structure 200 and the second connection structure 300) formed at both ends of a block body 3 made of a prismatic concrete product. Three holes 5 are formed in the upper surface 4 of the block body 3, and columns such as guardrails are inserted and fixed in these holes 5. A groove 7 is formed through the bottom surface 6 of the block body 3 in the width direction.

[0018] As shown in detail in Fig. 5, the first connection structure 200 includes a first plane 20, a convex portion 21, a first angle regulating side wall 23, and a first support portion 25. The first plane 20 is formed at a position slightly lower than the upper surface 5 of the block body 3, whereby a sufficient height in the vertical direction, that is, a sufficient volume, can be ensured for the convex portion 21. A pair of first angle regulating side walls 23, 23 are formed so as to sandwich the first plane 20. It is preferable that the angle regulating side wall 23 is a flat side wall, but it can also be an inclined surface or a curved surface. The first plane 20 is provided with a first support portion 25. In this example, a long-axis nut is embedded as the first support portion 25. The position of the first support portion 25 is the position of the center of curvature of the convex portion 21 having a side wall of a curved surface with a first radius of curvature in a horizontal cross-sectional view.

[0019] The second connection portion 300 includes a second plane 30, a concave portion 31, a second angle regulating side wall 33, and a second support portion 35. The second plane 30 is formed at the same height as the first plane 20. In other words, the first plane 20 and the second plane are located on the same virtual plane. The side wall of the concave portion 31 has a curved surface with a first radius of curvature in a horizontal cross-sectional view. As a result, it becomes slidable when fitted with the convex portion 21. The second angle regulating side wall 33 is formed so as to sandwich the second plane. A long-axis nut is embedded in the second plane 30 as the second support portion 35. The position of the second support portion is not particularly limited, but it is preferably located on the central axis L1 of the block body and closer to the center of the block body than the second angle regulating side wall 33. The displacement amount from the second angle regulating side wall 33 toward the center side of the block body is preferably the same as the same displacement amount from the first angle regulating side wall 23 to the first support portion 25. Here, it is also preferable to arrange the first support portion 25 on the central axis L1 of the block body.

[0020] A pair of first angle regulating side walls 23, 23 are inclined at an angle α with respect to a virtual line L2 orthogonal to the central axis L1 of the block body 3. The same applies to a pair of second angle regulating side walls 33, 33. As a result, when the connected body of the base blocks is bent at the connecting portion with the convex portion 21 fitted into the concave portion 31, as shown in FIG. 5, the second angle regulating side wall 33 facing the first angle regulating side wall 23 interferes, preventing further bending.

[0021] In this example, the maximum bending angle is set to 15 degrees. As a result, it can be seen that the included angle 4α between the first angle regulating side wall 23 on the opposite side of the bend and the second angle regulating side wall becomes 30 degrees. In this example, the included angle between the first angle regulating side wall 23 and the virtual line L2 and the included angle between the second angle regulating side wall 33 and the virtual line L2 are set to the same size (7.5 degrees in this example), but the sum of the two included angles may be 15 degrees.

[0022] FIG. 7 shows a connecting member 40 for connecting the first connecting portion 200 of one base block to the second connecting portion 300 of an adjacent base block. When arranging the base blocks 1 side by side on the road surface, the convex portion 21 is fitted into the concave portion 31 from the state of FIG. 7A.

[0023] Next, the flat plate-shaped connecting member 40 made of a steel plate shown in FIG. 7B is opposed to the first plane 20 and the second plane 30, and the first fitting hole 42 of the connecting member 40 is aligned with the first support portion (nut) 25, and the second fitting hole 43 is aligned with the second support portion (nut) 35. Here, the diameter of the first fitting hole is made slightly larger than the diameter of the first support portion (nut diameter) (to the extent that the bolt 46 described later can be inserted without difficulty), and the second fitting hole is made sufficiently larger (about 2 to 3 times) than the diameter of the second support portion (nut diameter).

[0024] By screwing the bolt 46 into the first support portion 25 with the washer 45 interposed therebetween, one end side of the connecting member 40 is fixed to the first plane 20, that is, the first connecting portion 200. On the other hand, by screwing the bolt 46 into the second support portion 35 with the washer 47 interposed therebetween, the other end side of the connecting member 40 is fixed to the second plane 30, that is, the second connecting portion 300.

[0025] The tightening by the bolts 46 does not inhibit the sliding between the convex portion 21 and the concave portion 31. With respect to the first support portion 25, that is, since the diameter of the bolt 46 and the diameter of the first fitting hole 42 are substantially the same, the cores of the two do not deviate, and the convex portion and the concave portion slide around this position.

[0026] On the other hand, with respect to the second support portion 35, that is, since the second fitting hole is formed larger with respect to the diameter of the bolt 46, the position of the bolt 46 in the second fitting hole deviates when the concave portion 31 slides. In other words, the center of the second fitting hole shifts from the center of the second support portion 35. Thereby, deformation or breakage of the plate-shaped connecting member can be prevented. As shown in FIG. 7(A), the second fitting hole 53 can also be formed in a horizontally long and fan shape along the concave portion 31.

[0027] FIG. 8 shows the convex portion 26 of another embodiment. This convex portion 26 has the side surface of a polygonal prism. In other words, it is what is obtained by cutting a polygonal prism in the axial direction, and its corner portion 28 is inscribed in a virtual circumference with a first radius of curvature. At this time, it is preferable that at least two or more corner portions 28 come into contact with the concave portion 31.

[0028] Although the embodiments and modifications of the present invention have been described in detail above, the present invention is not limited to these descriptions in any way. The convex portion 21 shown in FIGS. 1 to 7 is in an arc column shape, but it can be seen that when the position of the first support portion is made the same surface as the first angle regulating side surface, its shape becomes a column shape.

Explanation of Signs

[0029] 1 Base block 3 Block body 20 First plane 21 Convex portion 23 First angle regulating side wall 25 First support portion 30 Second plane 31 Concave portion 33 Second angle regulating side wall 35 Second support portion 40 Connecting portion 42 First fitting hole 43 Second fitting hole

Claims

1. A connecting structure of foundation blocks arranged along the boundary of the ground surface, a block body, a first flat surface formed at one end of the block body and a pair of first angle regulating side walls formed so as to sandwich the first flat surface, a second flat surface formed at the other end of the block body and a pair of second angle regulating side walls formed so as to sandwich the second flat surface, and the second flat surface is formed on the same plane as the first flat surface, a columnar convex portion formed on the first flat surface and protruding from the block body, a concave portion formed on the second flat surface and slidably fitted with the convex portion, a flat plate-shaped connecting member placed on the second flat surface of the block body adjacent to the first flat surface, the connecting member having a first fitting hole in a portion facing the first flat surface and a second fitting hole in a portion opposing the second flat surface, a first support portion is formed on the first flat surface, a second support portion is formed on the second flat surface, The first support portion is rotatably supported in the first fitting hole of the flat plate portion, and the second support portion is rotatably supported in the second fitting hole, a connecting structure of foundation blocks.

2. The convex portion is semi-cylindrical or arc-shaped with a first radius of curvature or polygonal columnar inscribed in the curved surface of the first radius of curvature, the concave portion is a curved surface of the first radius of curvature, and the first support portion is formed at the center of the curved surface defining the outer periphery of the side surface of the convex portion, the connecting structure according to Claim 1.

3. When a pair of the foundation blocks are bent at their connecting portion, the center of the first fitting hole coincides with the center of the first support portion, and the center of the second fitting hole is offset from the center of the second support portion, the connecting structure according to Claim 1.

4. When adjacent foundation blocks are bent, the first side wall of one block body contacts the second angle regulating side wall of the other block body facing it, the connecting structure according to Claim 1.

5. The included angle between the first angle regulating side walls and the second angle regulating side walls on the opposite side of the contacted first angle regulating side wall and second angle regulating side wall is 30 degrees, the connecting structure according to Claim 4.

6. A foundation block arranged along the boundary of the ground surface, a block body, a first flat surface formed at one end of the block body and a pair of first angle regulating side walls formed so as to sandwich the first flat surface, a second flat surface formed at the other end of the block body and a pair of second angle regulating side walls formed so as to sandwich the second flat surface, and the second flat surface is formed on the same plane as the first flat surface, A columnar convex portion formed on the first plane and protruding from the block body; A concave portion formed on the second plane and slidably fitted with the convex portion; A first support portion is formed on the first plane; A base block in which a second support portion is formed on the second plane.

7. The convex portion is semi-cylindrical or arc-shaped with a first radius of curvature or polygonal columnar inscribed in the curved surface of the first radius of curvature, the concave portion is a curved surface of the first radius of curvature, and the first support portion is formed at the center of the curved surface defining the outer periphery of the side surface of the convex portion. The base block according to claim 6.

8. The first support portion and the second support portion are arranged on the longitudinal center line of the block body. The base block according to claim 6.

9. The distance between the first support portion and the side wall of the convex portion is 1 / 4 to 1 / 2 of the width of the block body. The base block according to claim 8.

10. The first support portion is formed closer to the center of the block body than the pair of first angle restricting side walls. The base block according to claim 8.

11. A connecting member applied to the base block according to claim 3, It is formed in a flat plate shape so as to be placed on the second plane of the block body adjacent to the first plane, has a first fitting hole in a portion facing the first plane, and has a second fitting hole in a portion facing the second plane, The first fitting hole is rotatably fitted to the first support portion, and the second fitting hole is rotatably fitted to the second support portion, The inner diameter of the first fitting hole and the diameter of the first support portion are the same, and the inner diameter of the second fitting hole is larger than the diameter of the second support portion. Connecting member.

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