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JP-2022001735-A - BLOCK MAT FOR REVETMENT, BLOCK FOR REVETMENT, AND REVETMENT STRUCTURE

JP2022001735AJP 2022001735 AJP2022001735 AJP 2022001735AJP-2022001735-A

Abstract

To disclose a block for a revetment which can simply take a countermeasure to turning up by overflow in a river.SOLUTION: There is provided a block for a revetment which is used to protect a slope face at a protected low land side against overflow in a river and which is made to gently taper off toward a bottom face from a downstream side of the overflow to an upstream side in a side view.SELECTED DRAWING: Figure 4

Inventors

  • AKINAGA TAKUYA
  • MIURA HITOSHI

Assignees

  • MITSUBISHI CHEM INFRATEC CO LTD

Dates

Publication Date
20220106
Application Date
20211018
Priority Date
20170926

Claims (10)

  1. A revetment block mat used to protect the slope against river water flow. A mat and a plurality of blocks arranged on the surface of the mat. Of the plurality of blocks, the block (1) provided on the most upstream side of the water flow has a gradual taper toward the bottom surface on the upstream side than on the downstream side in side view. The block (1) extends from a flat bottom surface (1e), an upstream end face (1d), a downstream end face (1b), and an upper end of the end face (1d) toward the end face (1b). With an inclined surface (1a), The height of the end face (1d) is D (mm), The height of the end face (1b) is B + D (mm), The angle between the end face (1d) and the bottom surface (1e) is C (°), When the angle formed by the inclined surface (1a) and the bottom surface (1e) is A (°). (A × B + C × D) / (B + D) is 50 or less, Block mat for revetment.
  2. When the length from the upstream tip to the downstream tip of the bottom surface (1e) is E (mm), E / (B + D) is 2.5 or more. The revetment block mat according to claim 1.
  3. When the width of the end face (1d) is F (mm), F is 100 mm or more and 600 mm or less. The revetment block mat according to claim 1 or 2.
  4. B is 15 mm or more and 200 mm or less. The revetment block mat according to any one of claims 1 to 3.
  5. D is 10 mm or more and 100 mm or less. The revetment block mat according to any one of claims 1 to 4.
  6. When the length from the upstream tip to the downstream tip of the bottom surface (1e) is E (mm), E is 190 mm or more and 1000 mm or less. The revetment block mat according to any one of claims 1 to 5.
  7. C is 60 ° or more and 90 ° or less. The revetment block mat according to any one of claims 1 to 6.
  8. A is 5 ° or more and 45 ° or less, The revetment block mat according to any one of claims 1 to 7.
  9. A revetment block used to protect the slope against river water flow. In the side view, the upstream side of the water flow gradually tapers toward the bottom surface rather than the downstream side. A flat bottom surface (1e), an upstream end face (1d), a downstream end face (1b), and an inclined surface (1a) extending from the upper end of the end face (1d) toward the end face (1b). Equipped with The height of the end face (1d) is D (mm), The height of the end face (1b) is B + D (mm), The angle between the end face (1d) and the bottom surface (1e) is C (°), When the angle formed by the inclined surface (1a) and the bottom surface (1e) is A (°). (A × B + C × D) / (B + D) is 50 or less, A block for revetment.
  10. A revetment structure in which the revetment block mat according to any one of claims 1 to 8 or the revetment block according to claim 9 is laid on the slope of a river.

Description

This application discloses block mats and the like used for revetment of rivers. As disclosed in Patent Documents 1 to 4 and Non-Patent Document 1, revetment blocks and water beds are widely used to protect the slopes of rivers. For the revetment block, "turning measures" have been taken, such as embedding the end of the block in the slope and installing a strip-shaped concrete body to protect it. It is a schematic diagram for demonstrating the side surface shape of the revetment block (block (1)).It is a schematic diagram for demonstrating the structure of the revetment block mat 10.It is a schematic diagram for demonstrating the structure of the revetment block mat 10'.It is a schematic diagram for demonstrating the whole shape of the revetment block (block (1)).It is a schematic diagram for demonstrating the self-weight moment.It is a schematic diagram for demonstrating the revetment structure 100.It is a schematic diagram for demonstrating the effect by the revetment structure 100.It is a schematic diagram for demonstrating the side surface shape of the revetment block (block (1)) which concerns on Example and comparative example.It is a schematic diagram for demonstrating the fluid force moment. 1. 1. Revetment block mat (first embodiment) FIG. 2 schematically shows the configuration of the revetment block mat 10 according to the first embodiment. The revetment block mat 10 is a revetment block mat used to protect the slope on the inland side of the embankment against the overflow of a river, and is a revetment block mat and a plurality of blocks arranged on the surface of the mat 5. The block 1 provided on the most upstream side of the overflow among the plurality of blocks is gradually tapered toward the bottom surface on the upstream side than on the downstream side in the side view. 1.1. The mat 5 itself used for the mat revetment block mat 10 is known. For example, as the material of the mat 5, one or more selected from PET, PP, PE and the like can be adopted. Further, the shape of the mat 5 may be appropriately determined according to the size of the revetment block mat 10. For example, it is preferable that the width is 630 mm or more and 2000 mm or less, the length is 1000 mm or more and 9000 mm or less, and the thickness is 2 mm or more and 10 mm or less. As a specific example of the mat 5, various mats such as a gobi mat manufactured by Mitsubishi Chemical Infratec Co., Ltd. can be adopted. 1.2. A plurality of blocks are regularly arranged on the block mat 10 for revetment. However, in the revetment block mat of the present disclosure, a plurality of blocks may be arranged regularly or randomly. The arrangement of multiple blocks in the revetment block mat itself is known. The number of blocks in the revetment block mat is also not particularly limited. An appropriate number may be determined according to the size of the mat 5 and the like. The plurality of blocks are usually fixed to the surface of the mat 5. In the revetment block mat 10, a plurality of blocks are roughly classified into a block 1 provided on the most upstream side (the shoulder side) with respect to the overflow and a block 2 provided on the downstream side of the block 1. .. As in the revetment block 10'shown in FIG. 3, the positions of the upstream end portions of the blocks 1, 1, 1, and 1 on the mat 5 may be different from each other. The revetment block mat 10 is particularly characterized by the shape of the block 1 among these plurality of blocks. That is, the block 1 is gradually tapered toward the bottom surface on the upstream side than on the downstream side in the side view. FIG. 4 shows an example of the shape of the block 1. 4 (A) and 4 (C) are schematic perspective views, and FIGS. 4 (B) and 4 (D) are schematic side views. As shown in FIG. 4, in the side shape (silhouette) of the block 1, the tapered structure 1x on the upstream side is gentler than the tapered structure 1y on the downstream side. As shown in FIG. 4, the block 1 includes a flat bottom surface 1e, an upstream end surface 1d, a downstream end surface 1b, and an inclined surface 1a extending from the upper end of the end surface 1d toward the end surface 1b. Is preferable. Here, the height of the end face 1d is D (mm), the height of the end face 1b is B + D (mm), the angle between the end face 1d and the bottom surface 1e is C (°), and the inclined surface 1a and the bottom surface 1e are formed. When the angle is A (°), it is preferable that (A × B + C × D) / (B + D) is 50 or less. It can be said that (A × B + C × D) / (B + D) is the load average of the angles formed by the surface of the block 1 in the flow front direction and the installation surface with the projected area of the block 1 in the flow direction. When (A × B + C × D) / (B + D) is 50 or less, the lift and drag received from the fluid become smaller, and the block 1 becomes more difficult to turn over against overflow. (A × B + C × D) / (B + D) is more preferably 45 or less, stil