JPS6043514A - Concrete block for revetment and revetment structure - Google Patents

Abstract

PURPOSE:To enable a long square concrete block to confrom to a curve even when connected with reinforcing bars by a method in which the four corners of the concrete block are cut into a triangular form, and a recession is provided in the central part of the long side and a projection having an undulated recession on its upper surface is provided on the front and back sides. CONSTITUTION:A trapezoidal recession (a) is provided in the central part of the upper and lower long sides of a long square concrete block of uniform thickness. The four corners of the concrete block are cut into a triangular form, and projections (a) are provided on the left and right sides and the upper and lower parts of the block. A projection (c) having a nearly trapezoidal cross section and a wavy upper surface is provided on one or both sides of the central part of the projection (c). The recession (d) is led to a through hole 3 provided in the block body. A revetement block capable of damping the energy of flowing water according to the curved line can thus be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to concrete blocks for river bank protection and bank protection structures.

For narrow and muddy rivers, blocks are often piled up about 5 minutes apart on the slope of the revetment. However, in places where there are rapids, there are no suitable large stacking blocks, so conventionally large blocks for wave-dissipating foot protection have been used instead. However, because the original purpose of the blocks used for wave-dissipating footing is to dissipate waves, the gaps between the blocks are too wide, and the backfilling material and earth and sand from the back of the seawall may leak and cause the buried soil to cave in. Ta.

In addition, curved sections require irregularly shaped blocks, which is extremely difficult to construct especially in areas with a small radius of curvature, and is the biggest cause of increased construction costs. The present invention easily eliminates these drawbacks and will be explained below with reference to Examples. 1st
The figure is a front view of the block of the present invention (hereinafter simply referred to as "this block") 1, where a is a trapezoidal recess attached to the center of two long sides of a rectangular thick plate with constant thickness. , 2 are surfaces formed by cutting the four corners of the plate into small triangular shapes so as to match the slopes of the recesses a. In this way, the convex portion is formed at the same time. C is a convexity attached to the center of the plate, parallel to the direction of the short side of the plate, and on both sides or one side of the plate so as to match the height of the plate. 3 is a small hole bored through the center of the convex C. Reference numeral 4 designates large circular through-holes on both sides of the convex C that pass through the plate surface. Of course, this through hole is not limited to a circular shape, and may be square or hexagonal, but in this case, a circular shape is most economical. d is a recess to prevent the head of the bolt at the tightening point from protruding from the surface of the convex C when connecting the main blocks. This is convenient because the connecting blocks, which will be described later, can be connected and arranged without any gaps. Figure 2 is a plan view of Figure 1, and C is a convex cross section with a trapezoidal head with wavy unevenness, and is located in the center of the plate parallel to the short side of the plate. It is attached to both sides or one side of the plate to match the height. To deal with this, a method has already been developed in Japanese Patent Application No. 89599 of 1973 to insert a gap retaining material between the concrete plates of thin plate plates. When it is necessary to prevent the filling material from flowing out, the gap retaining material also becomes too large to be lifted by hand, which takes time and effort to assemble the blocks, leading to an increase in construction costs. However, since the convex C of the main block is fixed to the thick plate 1, the gap 1
There is no need to insert IAR holding material. 3 indicated by a dotted line is a through hole for passing the iron rod. FIG. 3 is an enlarged view of the connecting portion when the corrugated convexes and convexes of the block are connected so as to interlock with each other. The corrugations of the convex C are preferably formed so that they are in close contact with each other at the center, but there is a slight gap 5 at both ends. 3' indicated by dotted line
Even with a horizontal bar. Since the convex C has such a shape, it can bend in either direction around the contact point 6 within the range of the gap 5, like a snake. Therefore, even very small curves can be handled freely. However, since the corrugations are interlocked with each other around the axis of the iron rod, it cannot rotate. Therefore, one iron rod for connection is sufficient,
It became economical.

Figure 4 shows a connected concrete block formed by passing the iron rods through the small holes 3 of several main blocks, connecting them so that the unevenness of the convex C engages with each other, and tightening both ends of the iron rods. This is an example showing one unit (hereinafter simply referred to as a "connected block"), and this is designated as e.

7 is the gap between the main blocks, which is the thickness of the main blocks /
2 is the standard. Therefore, the thickness of the convex C is l/ of the thickness of the main block. FIG. 5 shows an example of a connecting block in which a convex C is attached only to one side of the printing plate and is combined to form a unit, and the break is designated as f. 8 is this block-
Although there is a mutual gap, since there is only one convex C, the gap is 8
The size of gap 7 is 4. However, in this case, convex C
It is better to have a simple trapezoidal shape without adding waves or shapes to the head.

Fig. 6, Fig. 1 is an example of a shore structure constructed by stacking several units of connected blocks formed by connecting main blocks, Fig. 6 is a cross-sectional view, and Fig. 7 is a cross-sectional view. is a front view of FIG. 6; In Figure 6, several units of connecting blocks are installed successively on the ground in the connecting direction of the iron rods, and similar connecting blocks are successively placed on top of the same unevenness a.

A seawall structure constructed by stacking the connecting blocks while inserting the anti-sand sheet 11 between the backing material 9 and the burial layer 10, with b interlocking with the unevenness &b of the lower connecting block. This is a cross-sectional view of In the main bank structure, the upper and lower connecting blocks are interlocked with each other with unevenness a and b, so there is no risk of it slipping due to earth pressure from the back. In addition, since the water on the back side of the structure flows out from the small gaps between the blocks or the gaps between the blocks at the bottom, residual water pressure will not be applied to the eroded shore structure. Furthermore, if the overall dimensions of this block and the sizes of a, b, etc. are appropriately selected, the slope when the connecting blocks are stacked can be made to accurately match the predetermined design slope. For example, the slope is 5
It was a minute.

Fig. 1 is a front view of Fig. 6, and one unit of the connecting block at the beginning of the first stage is f in Fig. 5, and hereinafter, one unit connected to it is e in Fig. 4. The second row is exactly the opposite of the first row, with the first unit starting from e and the ending unit being f. If you repeat the stacking of connected blocks in order such that the third stage is the same as the first stage, the fourth stage is the same as the second stage, etc., the blocks between adjacent main blocks will be arranged in a staggered manner. be done. Since the gaps 7 and 8 are formed by the convex C of the main blocks, the backing material 9 on the back side of the revetment structure in which the connecting blocks are laminated will be locked to the convex C and there is no risk of it flowing out to the front of the bank. Not at all.

In addition, when connecting blocks are stacked in several stages, the radius of curvature and curve extension will be different between the lower and upper stages in the curved section.For this reason, with conventional blocks, either the irregularly shaped blocks will be used, or the irregular extensions of the upper and lower stages will stop. It was assumed that they would not receive any compensation. On the other hand, the connected block by book/block is the third
Since it bends freely at the contact point 6 shown in the figure, it can accurately accommodate all radii of curvature. In addition, regarding the difference in curve extension, the thickness of the convex C of this block is slightly changed (5 to 25 =
Within the range of Ta. In addition, adjusting the thickness of the convex C means that by simply replacing the formwork of the convex C, a regular block that is compatible with an irregularly shaped block that can accommodate any curved section can be created.

In addition, the connecting block is shaped like a condenser and has a large gap, so it is effective in weakening the force of flowing water.Furthermore, the negative passage hole 4 of this block prevents the flowing water from colliding violently with the seawall. Since a reasonable amount of water passes through the through hole 4 and produces a complicated flowing water, it is effective in further reducing the force of the flowing water in front of the seawall structure. In addition, since the negative passage hole 4 can be used for moving and transporting the main block and the connecting block, there is no need to specially embed suspension reinforcing bars, etc., and the block can be used conveniently.

Since this revetment structure has the features described in detail above, it can be applied not only to river banks but also to prevent collapse of slopes of roads, railways, etc.

[Brief explanation of the drawing]

Figure 1: Front view, Figure 2: Life plan, Figure 3:
・・Enlarged view of the connecting part, Figure 4, Figure 5... Connected concrete blocks, Figure 6 --- Cross-sectional view of the starvation shore structure,
Figure 1...Front view of Figure 6. 1... Main block, 2... Triangular cut surface, 3... Through hole for iron bar, 3', fist, iron bar, 4...
・Through hole, 5. 'F, 8-...Gap, 6Φ...Contact, 9...Back filling side, 101III/Filled soil, 11...
Sandproof sheets a, d...concave, b, c...confession, 6, f @ Kaiken connection: l concrete flock.

Claims (2)

[Claims] (1) A trapezoidal recess a is attached to the center of the two long sides of a rectangular concrete thick plate with a constant thickness, and the four corners of the plate are shaped into small triangles to match the slope of the recess a. Cut it into a shape and form a convex part, and make a convex C with a trapezoidal cross section and a wave-shaped unevenness on both sides or one side of the central part of the plate parallel to the short side of the plate. , and a small hole is drilled in the center of the core convex C to allow the iron rod to pass through, and a rectangular shape is made to pass through the plate surface on both sides of the wavy convex C.
A concrete block for shore spreading that features large through-holes such as hexagonal or circular. (2) A concrete block for a seawall according to claim 1 is formed by passing the iron rod through the small hole of the concrete block, engaging the unevenness of the convex C, and tightening both ends. Several units of connected concrete blocks, each unit being a connected concrete block, are installed on the ground in succession in the direction in which the iron bars are connected. A seawall structure constructed by laminating layers while filling the blocks with backing material, etc., so that they fit into the irregularities a and b of the blocks.