Rooted foundation blocks

Abstract

To provide a rooted foundation block which is resistant to subsidence and collapse and can be installed in a short period of time. [Solution] The embedded foundation block 1 comprises a main body 11 and a support portion 21. The main body 11 comprises a horizontal step portion 12 and an inclined plate portion 19, and the support portion 21 comprises a bottom wall 22 and left and right side walls 23. The back surface of the main body 11 is open, and a recess 31 is formed inside. The top surface of the main body 11 has an upper surface groove 13 cut out in a triangular shape in side view and formed along the width direction. The inclination angle θ2 of the inclined plate portion 19 relative to the horizontal step portion 12 is 116°. The bottom wall 22 has an area as large as the main body 11 projected vertically from above. By filling the recess 31 with soil or crushed stone after construction, the necessary weight for the foundation can be maintained, making it less likely to collapse even on loose ground.

Description

[Technical Field]

[0001] The present invention relates to embedded foundation blocks, and more particularly to embedded foundation blocks used to form and reinforce river banks. [Background technology]

[0002] Traditionally, revetment blocks have been commonly used to prevent damage to riverbanks and to preserve river ecosystems. Disasters can occur even in rivers with revetments, and the main cause is thought to be scouring of the riverbed by the river current, known as revetment disasters. For this reason, river revetments are embedded about 0.5 to 1.5 meters below the riverbed.

[0003] The above-mentioned conventional examples are shown in Patent Documents 1 to 3, and a representative revetment structure thereof will be described with reference to FIG. WL indicates the normal water level, and RG indicates the designed riverbed. The designed riverbed RG is the riverbed height set during river construction.

[0004] As mentioned above, the designed riverbed RG has several layers of embedded blocks 101 stacked on the underside. In the example shown, there are three layers. On top of the top embedded block 101, several layers of wall blocks 102 are stacked. The number of layers is determined by the size of the river, but they extend above the water level WL. Foundation concrete 103 is poured onto the underside of the lowest embedded block 101, and filling concrete 104 is filled between the blocks 101, 102 to join the blocks 101, 102 together. In response to the need to protect the river environment, the wall blocks 102 are made of environmentally friendly blocks that are suitable for plants and fish to live in, although they are expensive. However, for economic reasons, inexpensive conventional interlocking blocks are often used as the embedded blocks 101.

[0005] However, the above-mentioned conventional bank protection construction work often takes many days. That is, in order to pour the foundation concrete 103, it is necessary to remove the soil and level the ground, erect formwork 105, pour the ready-mixed concrete, and wait for it to harden. Also, in order to prevent water from seeping into the construction site during this time, temporary construction work such as piling up the soil and driving in sheet piles is required. Furthermore, when pouring the foundation concrete, it is necessary to remove the water, so a pump is used to change the water, and this process takes approximately 10 to 20 days depending on the site conditions.

[0006] Furthermore, with conventional bank protection structures, if the water volume increases due to heavy rain or if the water level remains high for a long period of time, the ground at the bottom of the riverbed may become loose, causing the multiple layers of embedded blocks 101 to shift position and ultimately be damaged. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 8-151644 [Patent Document 2] Japanese Patent Application Publication No. 8-13518 [Patent Document 3] Japanese Patent Application Laid-Open No. 2003-328375 Summary of the Invention [Problem to be solved by the invention]

[0008] In view of the above circumstances, the present invention aims to provide a foundation block that is embedded and is less likely to cause sinking or collapse of the revetment and can be installed in a short period of time. [Means for solving the problem]

[0009] The first invention is a rooted foundation block used as a foundation for stacking multiple layers of wall blocks that form a river bank block, and is installed in the ground below the planned riverbed. The rooted foundation block consists of a main body and a support part, the main body consists of a horizontal step part and an inclined plate part, the horizontal step part is formed with a vertical front surface and a horizontal upper surface, and the inclined plate part is a square thick plate member that is integrally installed on the support part in a state in which the upper part is inclined so that it is set back more than the lower part. The support part consists of a bottom wall and left and right side walls, the bottom wall has an area approximately the same as that of the main body part projected vertically from above, the left and right side walls are members connecting the main body part and the bottom wall, the back surface of the main body part is open and the inside is formed into a recess, the height of the main body part is the same as the embedment dimension of the construction part, a triangular-shaped upper surface groove is formed along the width direction on the upper surface of the main body part when viewed from the side, and the inclination angle of the inclined plate part with respect to the horizontal step part is 100° or more and 130° or less. The second invention of the embedded foundation block is characterized in that the groove angle of the upper surface groove is greater than or equal to 80° and less than or equal to 100°. [Effects of the Invention]

[0010] The first idea has the following effects: a) The embedded foundation block is a one-piece block, and the bottom wall has an area as large as the main body projected vertically from above.If soil or crushed stone is placed in the recess after construction, it can maintain the necessary weight as a foundation, making it less likely to collapse even on loose ground. b) Since a recess is formed inside the main body, it is lightweight and easy to install. c) By filling the upper groove with concrete, the embedded foundation block can be firmly connected to the wall blocks stacked on top of it. d) Adjacent embedded foundation blocks may be connected using horizontal steps. e) By filling the upper groove of the embedded foundation block with concrete, the embedded foundation block can be firmly connected to the wall block stacked on top of it, thereby increasing the strength of the entire revetment block. f) Construction can be completed by installing embedded foundation blocks after leveling the ground, so there is no need to pour concrete or use formwork. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a side view of a first embodiment of the present invention, the embedded foundation block; [Figure 2] (A) is a left side view of the embedded foundation block, and (B) is a plan view of the same. [Figure 3] FIG. 2 is a perspective view of the embedded foundation block shown in FIG. [Figure 4] An explanatory diagram of the installation state of embedded foundation blocks. [Figure 5] This is an oblique view of the embedded foundation block of the first embodiment and an enlarged view of the connecting portion. [Figure 6] An explanatory diagram of the curved installation status of the embedded foundation block and an enlarged view of the gasket section. [Figure 7] FIG. 4 is a cross-sectional view of a second embodiment of the present invention; [Figure 8] FIG. 1 is a cross-sectional view of a conventional revetment structure. DETAILED DESCRIPTION OF THE INVENTION

[0012] Next, an embodiment of the present invention will be described with reference to the drawings.

[0013] The embedded foundation block 1 of the present invention is a large, monolithic block that is buried below the designed riverbed RG, as shown in Figure 4. Details of the block will be explained below.

[0014] As shown in Figures 1 to 3, the embedded foundation block 1 is rectangular when viewed from the front and back, and resembles a scalene triangle when viewed from the side. This embedded foundation block 1 consists of a main body portion 11 and a support portion 21, which are formed as a single unit. The main body portion 11 consists of a horizontal step portion 12 and an inclined plate portion 19, which are formed as a single unit.

[0015] The inclined plate portion 19 of the main body portion 11 is a rectangular thick plate-like member made of concrete with an upper portion inclined back from the lower portion. A horizontal step 12 is connected to the lower surface of the inclined plate 19 of the main body 11. In the normal installation state, the horizontal step 12 is formed so that the upper surface is horizontal and the front surface is vertical.

[0016] The inclination angle θ2 of the inclined plate portion 19 of the main body portion 11 relative to the horizontal step portion 12 (i.e., the inclination angle relative to the horizontal line after installation) is preferably 100° to 130°, more preferably 110° to 120°, and most preferably 116°. With the above-mentioned inclination angle θ2, an inclined revetment can be constructed by stacking the wall blocks 2.

[0017] The height of the embedded foundation block 1 is the height of the horizontal step portion 12 plus the height of the inclined plate portion 19. The height of the inclined plate portion 19 is the same as the embedded dimension of the construction portion. Therefore, the overall height of the embedded foundation block 1 is higher than the embedded dimension (usually 500 mm to 1000 mm).

[0018] An upper surface groove 13, which is cut out in a triangular shape in side view, is formed along the width direction on the upper surface of the main body 11 (or inclined plate portion 19) of the root foundation block 1. The upper surface groove 13 is formed as a triangular groove by a slope 13a on the front side and a slope 13b on the rear side. The groove angle θ3 of the upper surface groove 13 is equal to or greater than 80° and equal to or less than 100°, and is preferably 90°. Within this angle range, a sufficient amount of concrete can be secured to join with the wall blocks 2 piled up above.

[0019] The inclined plate portion 19 and the horizontal step portion 12 that constitute the main body portion 11 have side walls on both sides each having a side groove 14 formed in the vertical direction for inserting a packing.

[0020] A support part 21 is integrally provided on the rear surface of the main body part 11. This support part 21 is made up of a bottom wall 22 and left and right side walls 23. If the width of the main body part 11 is wide, an intermediate wall 24 may be provided between the left and right side walls 23, 23. The bottom wall 22 has a bottom area approximately equal to that of the inclined plate portion 19 projected vertically from above. The side walls 23 and intermediate wall 24 are members that connect the main body portion 11 (the horizontal step portion 12 and the inclined plate portion 19) and the bottom wall 22, and therefore form a triangular shape in side view. Based on the above-described shape, the depth BL of the bottom of the embedded foundation block 1 is greater than the width UL of the top surface.

[0021] The area surrounded by the bottom wall 22 and side wall 23 of the support portion 21 and the back surface of the main body portion 11 forms a recess 31. When the intermediate wall 24 is used, the recess 31 is divided into two areas, left and right. This recess 31 is recessed down to the back surface of the main body portion 11, but the recess 31 may be made deeper by forming an additional recess in the back surface of the inclined plate portion 19 itself.

[0022] As described above, the embedded foundation block 1 is lightweight despite its large size and volume due to the presence of the recess 31. This makes it easy to handle during construction, which helps to shorten the construction period. Moreover, if the recess 31 is filled with earth or crushed stone after construction, the necessary weight for the foundation can be secured, making the embedded foundation block 1 less likely to collapse. Furthermore, the large base area means that it is less likely to tip over even on loose ground.

[0023] Next, we will explain the revetment construction using the embedded foundation block 1 of this invention. First, excavate the riverbed to the depth of the planned riverbed RG and level the bottom. In this case, there is no need to pour concrete, so there is no need to use formwork. Once the ground has been leveled, the embedded foundation blocks 1 are placed. The height of the embedded foundation blocks 1 is adjusted to the embedment height, so it is usually 500 to 1500 mm. Therefore, the embedded foundation blocks 1 can be installed individually in the vertical direction. In the width direction, the same embedded foundation blocks 1 can be installed in succession, as shown in Figure 3.

[0024] As shown in Figure 4, by stacking wall blocks 2 in multiple layers on top of the embedded foundation blocks 1, a quay can be formed underwater above the planned riverbed RG, and by stacking them further, a quay can be formed even higher than the water level WL. When stacking the blocks, the upper groove 13 between the embedded foundation block 1 and the immediately upper wall block 2 can be filled with concrete to firmly bond them together. Furthermore, the wall blocks 2 of each tier and the adjacent wall blocks 2 of the same tier can be tightly joined together by filling the gaps with concrete.

[0025] As shown in FIG. 5, adjacent embedded foundation blocks 1, 1 can be connected horizontally by placing a connecting plate 15 across the adjacent horizontal step portions 12 and screwing in bolts 16 to join them.

[0026] Furthermore, as shown in FIG. 6, it is easy to install a large number of embedded foundation blocks 1 with a large curve so that they follow the flow of the river. In this case, if a packing 17 is inserted between the facing side grooves 14, 14 of the adjacent embedded foundation blocks 1, 1, it is possible to prevent the infiltration of water from the river.

[0027] Next, the embedded foundation block 1 of the second embodiment will be described with reference to FIG. This embedded foundation block 1 has a rear step 18 formed from the top of the inclined plate portion 19 toward the rear. If filling concrete is also poured onto the top surface of this rear step 18, the bond between the wall blocks 2, 2 can be further strengthened.

[0028] The embedded foundation block 1 of the first and second embodiments of the present invention has the following effects. a) The embedded foundation block 1 is a one-piece block, and the bottom wall 22 has a large area equivalent to the main body 11 projected vertically from above. If soil or crushed stone is placed in the recess 31 after construction, the necessary weight for the foundation can be maintained, so the block is less likely to collapse even on loose ground, and the embankment is less likely to collapse. b) Since the recess 31 is formed inside the main body 11, it is lightweight and easy to install. c) By filling the upper groove 13 with concrete, the embedded foundation block 1 can be firmly connected to the wall block 2 stacked on top of it. d) Adjacent embedded foundation blocks 1 can be connected to each other using horizontal steps 12. e) By filling the upper groove 13 of the embedded foundation block 1 with concrete, the embedded foundation block 1 can be firmly connected to the wall block 2 stacked on top of it, thereby increasing the strength of the entire embankment. f) Since construction can be completed by installing the embedded foundation blocks 1 after leveling the ground, there is no need to pour concrete or use formwork. [Explanation of symbols]

[0029] 1. Rooted foundation blocks 2 Wall blocks 11 Main body 12 Horizontal step 13 Top groove 14 Side groove 18 Rear step 19 Inclined plate section 21 Support part 22 Bottom wall 23 Side wall 31 Recess

Claims

1. A foundation block used as a foundation for stacking multiple layers of wall blocks that form a river bank block, and installed in the ground below the planned riverbed, The embedded foundation block comprises a main body and a support part, The main body portion comprises a horizontal step portion and an inclined plate portion, The horizontal step portion has a vertical front surface and a horizontal upper surface, the inclined plate portion is a rectangular thick plate-like member, and is integrally provided with the support portion in an inclined state such that an upper portion thereof is recessed more than a lower portion thereof, The support portion comprises a bottom wall and left and right side walls, The bottom wall has an area approximately equal to that of the main body portion projected vertically from above, the left and right side walls are members that connect the main body portion and the bottom wall, The back surface of the main body is open, and the inside is formed as a recess, The height of the main body is the same as the embedment dimension of the construction part, An upper surface groove having a triangular shape in a side view is formed on the upper surface of the main body along the width direction, The inclination angle of the inclined plate portion relative to the horizontal step portion is 100° or more and 130° or less. A rooted foundation block characterized by:

2. The groove angle of the upper surface groove is 80° or more and 100° or less. A rooted foundation block characterized by:

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