JPWO2011089690A1 - Framework block, framework block assembly structure, method for improving creep resistance of framework block, and method for improving shear resistance or oblique load of framework block assembly structure - Google Patents

Abstract

The substrate 3 is a rectangular plate member. The support column 5 is erected toward one side of the substrate 3. A portion of the substrate 3 where the column 5 is not disposed is provided with a pair of substrate-side column fitting portions 7. The board-side column fitting portion 7 corresponds to the tip shape of the column 5, and the tip of the column 5 and the board-side column fitting portion 7 can be fitted, and the fitting corresponding to the tip portion of the column This is a part where a hole or a fitting receiving part is formed. The column 5 is a truncated cone columnar column having a taper angle θ of 2 to 6 ° from the substrate 3 toward the tip. At this time, the thickness R immediately below the bent portion 27a at the tip of the support column 5 is thicker than the thickness Q at the base of the lower end of the support column 5. For example, R is desirably 1.2 times or more than Q.

Description

  The present invention relates to a skeleton block or the like used in a water storage facility for storing rainwater or the like for fire prevention, sprinkling, or flood prevention in buildings or apartment houses, particularly in housing estates, schools, hospitals, etc. Is.

2. Description of the Related Art Conventionally, various water storage facilities for storing rain that has fallen are provided in, for example, vacant lots around a large building or housing complex, or in a basement of a bicycle storage. One of these types is to temporarily store precipitation in a water storage facility and gradually drain it into sewage, or to infiltrate the surroundings to prevent urban flooding (temporary storage type). is there. The other type is provided for the purpose of using rainwater stored in a water storage facility as fire prevention water or for sprinkling water in flower beds, vegetable gardens, etc. (water storage type).
In particular, this type of water storage facility is often provided when building new buildings or housing estates in preparation for water shortages in summer.

As a typical example of this kind, there is a water storage facility described in Patent Document 1. This is the former type, that is, a temporary storage type storage facility for the purpose of preventing urban flooding.
As shown in FIG. 11, the ground 43 is dug down in advance to form, for example, a rectangular hole 47, and then the inner surface of the hole 47 is covered with gravel or nonwoven fabric to form a lining layer. To do. In addition, if it is a storage facility such as a storage type rainwater, it is covered with a waterproof sheet.

After the lining layer is formed, the skeleton block 41 is assembled vertically and horizontally in the digging hole 47 to form a space holding skeleton block structure having a water storage space therein. When the space retaining skeleton block structure is completed, finally, gravel and soil are backfilled on the space retaining skeleton block structure to form the coating layer 45.
In FIG. 11, rainwater or the like flows into the rainwater reservoir 40 from the inlet 29, and water in the rainwater reservoir flows out to the outside from the outlet 51.

JP 2000-352080 A

  Patent Document 1 is a storage block used in a rainwater underground infiltration storage facility. When four cylindrical bodies having different heights project from a base plate and are turned upside down, they are used for engagement of the front end of the cylindrical body. The present invention relates to a unit member in which the portions are engaged with each other so that the sum of the heights of the upper and lower cylindrical portions facing each other is equal.

  FIG. 12 is an exploded perspective view showing a skeleton block 41 (41a, 41b) which is an example of such a skeleton block. The skeleton block 41 includes a substrate 61, four struts 63, and the like. The board | substrate 61 is a rectangular plate-shaped member, and the some hole 67 which can permeate | transmit water is formed. Supports 63 are erected in the vicinity of the four corners on one side of the substrate 61. On the upper surface of the support 63, a recess 69 and a protrusion 71 are respectively provided on the support 63 on the diagonal line.

  In the example shown in FIG. 12, the skeleton block 41b is arranged in the lower stage so that the column 63 faces upward, and the skeleton block 41a is arranged thereabove so that the column 63 faces downward. At this time, the tips of the struts 63 of the skeleton blocks 41a and 41b come into contact with each other. The skeleton block 41 is assembled in the vertical direction by repeating the above. At this time, the concave portion 69 and the convex portion 71 are fitted to each other at the abutting portion between the struts 63 of the skeleton block 41a and the skeleton block 41b facing each other. Thereby, the shift | offset | difference of the support | pillar 63 front-end | tip is suppressed.

  However, such a skeleton block 41 simply engages the ends of the columns 63. In addition, since the tips of the struts 63 are engaged with each other, the engaging portions are originally weakly displaced by the shearing force in the horizontal direction and are engaged with each other at low cost. Moreover, since it is necessary to provide an engaging part in the top surface of the support | pillar 63, it is necessary to make the protrusion 71 smaller than the outer diameter of the support | pillar 63. FIG. For this reason, the shear strength with respect to the horizontal direction of the protrusion 71 is further weaker than the strength of the column 63 itself. Further, since the tips of the pillars 63 are in contact with each other, the substrate interval is twice the height of the pillars 63. Therefore, in a storage facility using such a skeleton block 41, there is a risk of collapse due to a shearing force in the horizontal direction such as earth pressure. Moreover, since it is necessary to provide an engaging part at the front-end | tip of the support | pillar 63, water and air accumulate in the support | pillar 63 part, and when such a skeleton block 41 is used, the water storage to a storage tank is carried out. There is a problem that cannot be performed efficiently.

  In view of such a problem, the present invention provides a skeleton block having a high strength of a space-holding skeleton block structure configured by assembling a skeleton block and excellent in workability during transportation and assembly by an operator. For the purpose.

  In order to achieve the above object, the first invention provides a space that is formed by digging down the ground and is constructed by assembling a digging hole having an upper opening and a plurality of resin skeleton blocks disposed in the digging hole. A skeleton block used in a rainwater storage facility having a holding skeleton block structure and a covering layer covering an opening at an upper part of the digging hole, a flat substrate that is square or rectangular, and a substrate that stands on the substrate And a pair of board-side fitting portions that are provided on the board on the side where the pillar is erected and into which a tip of the pillar can be fitted, and the pair of skeleton blocks are When the substrate surfaces on which the columns are erected are opposed to each other, the tips of the columns of one skeleton block can be fitted into the substrate side fitting portion of the other skeleton block, and the taper angle of the column is 2 ~ 6 ° and the base of the strut The thickness of the column is tapered toward the tip, and the wall thickness is increased as it goes to the tip. The thickness of the column at the base of the column is increased. The skeleton block is characterized in that the wall thickness of the bent portion that is bent in the center direction of the column is 1.2 times or more and 1.4 times or less.

  The support column and / or the board-side fitting portion includes a first center line parallel to one side of the board and a first center line parallel to the other side of the board and perpendicular to the first center line. The first center line perpendicular to the side of the length A of the board is formed in each of four sections divided by two center lines. From the second center line perpendicular to the side of the length B of the substrate and at a distance Y1 in the direction perpendicular to both sides. It is desirable that X1 = A / 4 ± A / and Y1 = B / 4 ± B / 24 line symmetrical positions. Here, if the column center position is X1 = A / 4 ± A / 24 and arranged at line-symmetrical positions in the range of Y1 = B / 4 ± B / 24, the column center position is obtained when the skeleton block structure is obtained. The position can be used in the same manner as in the case of X1 = A / 4 and Y1 = B / 4.

  The substrate is square, and a fitting projection and a fitting hole that can be fitted to the fitting projection are provided on the back surface of the substrate, and the fitting projection and the fitting hole are provided on one side of the substrate. At least one each at the outer peripheral edge of the substrate in each of the four sections divided by a first center line parallel to the sides of the substrate and a second center line perpendicular to the first center line. 1 center line and the second center line are symmetrically formed, and are arranged to be opposed to each other in a region divided by two diagonal lines of the substrate, and the fitting hole is When the substrate is rotated 90 degrees from the center of the substrate, the tips of the columns and the bases of the columns are opposed to the substrate in the vertical direction by being formed at positions corresponding to the fitting protrusions. You may have the structure which can be arrange | positioned by direction. Further, the board side fitting portion protrudes to at least the hole in which the tip end portion of the support column can be fitted, or the support column side of the substrate that can hold the outer periphery and / or inner periphery of the tip end portion of the support post. You may have either of a convex part. Moreover, you may form a rib in the inner surface of the said support | pillar under the said bending part.

  According to the first invention, since the position of the column is X1 = A / 4 ± A / 24 and Y1 = B / 4 ± B / 24, the shear strength in the horizontal direction is excellent and the assembly is completed. Excellent skeletal block stability. In particular, the skeleton block in the assembled state is the tip of the column that is most likely to shift with respect to the shearing force in the horizontal direction. However, according to the present invention, since the tip of the column that is most likely to shift with respect to the shearing force in the horizontal direction is directly fitted to the substrate, the entire substrate can directly take charge of the shearing force in the horizontal direction.

  Further, the strut has a tapered shape that decreases in diameter as it goes to the tip, and the thickness in the thickness increases as it goes to the tip, so that the strength in the vertical direction can be improved. At this time, the taper angle is 2 to 6 °, and the ratio of the thickness of the bent portion at the front end of the column (below the column tip) to the thickness at the base of the column lower end (hereinafter referred to as the wall thickness at the upper and lower ends of the column) If the ratio is continuously increased from the base of the lower end of the support to the position immediately below the end of the support to be 1.2 times or more and 1.4 times or less, the effect of improving the strength can be obtained more efficiently. . In addition, since the support column is not perpendicular to the substrate but has a taper shape with a predetermined angle, the stress base is relieved in the support base and the support base is deformed by a horizontal shearing force. Since the wall thickness is continuously increased so that the ratio of the wall thickness at the upper and lower ends of the support column is in the range of 1.2 to 1.4, it is possible to identify from the base portion of the support column to the upper end portion. Since the stress is not concentrated at this point and the strength is improved, the support column does not buckle.

  In addition, if the column receiving part is formed at the bottom of the board side fitting part, the column and the board side fitting part can be reliably fitted when the board side fitting part and the column are fitted, When the column has a taper, the column and the board-side fitting portion can be more reliably fitted together with the contact between the taper surface of the column and the edge of the substrate-side fitting portion.

  Further, the board is provided with fitting protrusions and fitting holes, and at least one outer peripheral edge portion of the board in each of the four sections divided by the first center line and the second center line, And the second center line are symmetrically formed, so that when the substrates are fitted to face each other, the horizontal shear stress is distributed to each section, and the center of the substrate is Since the fitting hole is formed at a position corresponding to the fitting protrusion when rotated 90 degrees from the starting point, the fitting protrusion and the fitting hole are fitted to each other with the substrates facing each other. The horizontal displacement can be prevented, and the tips of the columns and the bases of the columns can be arranged in a direction facing the substrate in the vertical direction. Specifically, the tips of the columns can be arranged to face the substrate in the vertical direction via the column support part of the substrate. In addition, the substrate can be arranged with the base portions of the columns facing each other in the vertical direction.

  As described above, the mating protrusion and the mating hole are formed in line symmetry on the first center line and the second center line, respectively, and are further formed in 90 rotation symmetry with respect to the center of the board. Furthermore, the vertical arrangement of the substrate and the support can be controlled. If the structure having 90 rotational symmetry with respect to the center of the substrate is not secured, the combination in which the tip ends of the columns and the bases are opposed to each other, and the tips of the columns and the bases of the columns are vertically aligned with respect to the substrate. Therefore, it is possible to limit both of the combinations in which the tips of the columns and the bases of the columns are opposed to the substrate in the vertical direction.

  A second invention uses the skeleton block according to the first invention, the pair of the skeleton blocks are opposed to each other on the substrate surfaces on which the pillars are erected, and at least the tips of the pair of pillars of one skeleton block Either the outer circumference or the inner circumference fits to the convex portion of the pair of board-side fitting portions of the other skeleton block, and at least either the outer circumference or the inner circumference of the ends of the pair of struts of the other skeleton block However, by adopting an assembly structure of the skeleton block that fits the convex portions of the pair of board-side fitting portions of one skeleton block, the displacement of the skeleton block assembly structure is prevented and the strength of the substrate is improved. It is a skeleton block assembly structure.

  According to the second invention, when the pair of skeleton blocks are opposed to each other on the surfaces where the columns are erected, the columns of one skeleton block are fitted to the board-side fitting portion of the other skeleton block. Therefore, the strength is high and the assembly work of the skeleton block becomes easy.

  Note that one of the strut tip of the skeleton block and the board-side fitting portion is a fitting projection, and the other is a fitting hole that fits into the fitting projection. In the case of using as a fitting portion, a fitting hole can be formed as a receiving portion on the substrate side, or, instead of forming a fitting hole, a fitting convex portion can be formed and fitted. At this time, when the convex portion is formed as a receiving portion, the convex portion has an effect of strengthening the cross section of the substrate and improving the substrate strength, so as a fitting method capable of improving the substrate strength, It is desirable to provide at least a convex portion. In this way, the connection between the skeleton blocks facing each other up and down is performed by fitting the protrusions formed on one skeleton block and the receiving portion formed on the substrate of the skeleton block on the other side, for example, a convex portion. It can be performed only with the fitting hole or the convex portion. In this way, the structure can be assembled easily with the fitting protrusions and fitting receiving parts that are easy to form, for example, the convex part and the fitting hole, or only the convex part. Can be easily performed. In order to improve the water drainage in the skeleton block, a through hole for draining can be formed in the tip of the support column or the receiving part on the substrate side, so that air accumulates at the support tip of the skeleton block. It is possible to prevent the skeleton block from being lifted by buoyancy.

  Further, the skeleton block has an outer periphery fitting portion and an outer periphery fitting receiving portion on the outer peripheral portion of the substrate, and when the skeleton blocks are arranged adjacent to each other in the horizontal direction, the outer periphery fitting portion of one skeleton block. May be fitted to the outer periphery fitting receiving portions of the other adjacent skeleton block. According to the skeleton block formed in this way, the skeleton block can be assembled and integrated in the horizontal direction. As a result, the mechanical strength of the assembled space-retaining skeleton block structure can be improved.

  Further, since the outer shape of the substrate of the skeleton block can be formed in a simple shape, such as a square, a rectangle, etc., it can be easily transported and assembled. Moreover, in the case of a square or a rectangle, the conveyance efficiency by a truck etc. can also be made high and it is especially preferable.

  A third aspect of the invention is a space holding skeleton block structure configured by assembling a plurality of resin skeleton blocks using the skeleton block according to the first invention, on the inner surface of the support column below the bent portion, This is a method for improving the creep resistance of a skeleton block that prevents formation of a dent at the tip of the skeleton block by forming a rib. Here, according to the third invention, the bent portion at the tip of the support column is reinforced by the rib, so that a change in dimension due to the bending of the bent portion of the support column tip due to creep deformation can be prevented even when a vertical load is applied for a long time.

  4th invention uses the frame | skeleton block concerning 1st invention, makes the board | substrate surface in which the said support | pillar stood facing a pair of said skeleton blocks, and makes the other end the front-end | tip of a pair of said support | pillar of one frame | skeleton block The pair of board-side fitting parts of the other skeleton block is fitted to the pair of board-side fitting parts of the one skeleton block, and the assembled. A method for improving a shear load or an oblique load of a skeleton block assembly structure, wherein a plurality of pairs of skeleton blocks are arranged in a plurality of horizontal directions and vertical directions.

  As described above, according to the present invention, it is possible to provide a skeletal block having high strength of a space-holding skeleton block structure configured by assembling a skeleton block, and having excellent workability during transportation and assembly by an operator. Can do.

It is a disassembled perspective view which shows the assembly structure of the frame | skeleton block 1 of this invention. (A) is a front view of the skeleton block 1 in the assembled state, and (b) is an enlarged view of the tip of the column 5. (A) is a top view of the frame | skeleton block 1, (b) is the PP sectional view taken on the line of FIG. It is a figure which shows the internal shape of the support | pillar of the frame | skeleton block 1 of this invention, (a) is front perspective drawing, (b) is a cross-sectional perspective view of the support | pillar tip vicinity. 5 is a front view showing still another embodiment of the skeleton block 1. FIG. It is a figure which shows arrangement | positioning of the fitting part 7 of the support | pillar 5 and a board | substrate side support | pillar. 6 is a plan view showing still another embodiment of the skeleton block 1. FIG. It is a figure which shows the receiving part 33 in the fitting part 7 of a board | substrate side support | pillar, (a) is a figure which shows the case where a support | pillar fits into the recessed part provided in the circumference | surroundings of the fitting part 7 of a board | substrate side support | pillar, ) Is a diagram showing a case where a rib-like convex portion is formed around the fitting portion 7 of the board-side column and the column is fitted to the inner peripheral side of the convex portion, and (c) is a diagram of the substrate-side column. The figure which shows the case where a rib-shaped convex part is formed around the fitting part 7, and a support | pillar fits to the outer peripheral side of a convex part, (d) forms a convex part at the front-end | tip of a support | pillar, It is a figure which shows the case where this convex part fits to the fitting part 7 of a board | substrate side support | pillar. It is sectional drawing which shows the state which penetrated the rod-shaped member 39 to the frame | skeleton block. The figure which shows the state which the rod-shaped member 39 penetrated in the fitting part of the board | substrate side support | pillar fitting part 7 and the support | pillar 5. FIG. It is sectional drawing which shows the conventional water storage facilities, such as a common rainwater. It is sectional drawing which shows the skeleton block 41 from the former.

  Hereinafter, embodiments of the skeleton block used in the water storage facility such as rainwater of the present invention will be described in detail with reference to FIGS. The skeleton block described below can be used for various rainwater storage facilities as well as the conventional rainwater storage facility shown in FIG. Therefore, in the following, description of storage facilities such as rainwater will be omitted, and skeleton blocks that are characteristic of the storage facilities such as rainwater of the present invention will be described in detail.

  FIG. 1 is an exploded perspective view showing a skeleton block 1 (1a, 1b, 1c, 1d), and FIG. 2 (a) is a front view showing the assembled skeleton block 1. FIG. The skeleton block 1 includes a substrate 3 and a support column 5.

  The board | substrate 3 is a rectangular plate-shaped member, and the some hole 11 which can permeate | transmit water is formed. A pair of support columns 5 are arranged on the substrate 3. The support column 5 is erected toward one side of the substrate 3. A portion of the substrate 3 where the column 5 is not disposed is provided with a pair of substrate-side column fitting portions 7. The board-side column fitting portion 7 corresponds to the tip shape of the column 5, and the tip of the column 5 and the board-side column fitting portion 7 can be fitted, and the fitting corresponding to the tip portion of the column This is a part where a hole or a fitting receiving part is formed. In addition, arrangement | positioning of the fitting part 7 of the support | pillar 5 and a board | substrate side support | pillar is mentioned later.

  The column 5 is cylindrical and has a hole 9 formed therein. The support column 5 has a tapered shape with a diameter decreasing in the distal direction. When the support column 5 is stacked in the same direction, the support column 5 of the lower skeleton block fits in the hole 9 of the upper skeleton block. There is no space for storage.

  On the back surface of the substrate 3 (on the side opposite to the side on which the column 5 is erected), a substrate fitting protrusion 19 and a substrate fitting hole 21 are provided. Details of the board fitting protrusion 19 and the board fitting hole 21 will be described later.

  In order to assemble the skeleton block 1, the skeleton blocks 1 are turned upside down in the vertical direction, and stacked such that the support columns 5 and the fitting portions 7 of the substrate side columns face each other. When the skeleton block 1 is assembled, the tip of the column 5 is fitted into the fitting portion 7 (fitting hole) of the substrate side column. In the example of FIG. 1, the skeleton block 1d is arranged in the lower stage so that the support column 5 faces upward, and the skeleton block 1c is arranged above the support block 5 so that the support column 5 faces downward. At this time, the tip of the column 5 of the skeleton block 1d is fitted to the fitting portion 7 (fitting hole) of the substrate side column of the skeleton block 1c, and the tip of the column 5 of the skeleton block 1c is the frame block 1d. It fits with the fitting part 7 (fitting hole) of the board | substrate side support | pillar.

  On the substrate 3 of the skeleton block 1c, the skeleton block 1b is arranged with the support column 3 facing upward. Further, the skeleton block 1a is arranged on the skeleton block 1b with the support column 5 facing downward. The skeleton blocks 1a and 1b are arranged so as to fit each other's support column 5 and the fitting portion 7 of the board side support column. The skeleton block 1 is assembled in the vertical direction by repeating the above.

  As shown in FIG. 2A, in a state where the skeleton block 1 is assembled in the vertical direction, the holes 9 penetrating each column 5 (substrate 3) communicate with each other in the vertical direction. A substantially U-shaped groove 8 is provided on the end face of the tip of the column 5. The groove 8 is provided at the tip of the support column 5 so as to communicate the inner surface of the hole 9 and the outer surface of the support column 5. The groove 8 allows the inside and outside of the column 5 to communicate with each other when the skeleton block 1 is assembled so that water or air can move to the inside or outside of the column 5 through the groove 8. is there. By the grooves 8, water can surely reach the inside of the support column 5 and can be stored efficiently, and the skeleton block can be prevented from floating in the water due to the accumulation of air inside the support column 5. In addition, illustration of the groove | channel 8 is abbreviate | omitted in other drawings.

  FIG. 3A is a view of the substrate 3 as seen from the back side, and is a schematic diagram showing the fitting protrusions 19 of the substrate and the fitting holes 21 of the substrate provided in the substrate 3, and FIG. FIG. 2 is a cross-sectional view taken along the line PP in FIG. 1 when the skeleton block 1 and the like are assembled.

  As shown in FIG. 3A, the board fitting protrusions 19 and the board fitting holes 21 are provided in the vicinity of corners of an area where the board 3 is divided into four diagonal lines. The fitting area 21 of the board | substrate which is a fitting hole is provided in two division areas which mutually oppose on one side. The board fitting holes 21 are provided at the respective corners of the section area (the corners of the board 3). That is, a triangular substrate fitting hole is formed at the top of the triangular section area (excluding the central portion of the substrate). Further, in the two divided areas facing each other on the other side, a mating protrusion 19 of the substrate is provided. The board fitting protrusions 19 are provided at the corners of the board 3, respectively.

  That is, the triangular substrate fitting protrusions 19 are provided at the tops of the triangular section areas (except for the central portion of the substrate). The board fitting protrusion 19 and the board fitting hole 21 provided on the outer peripheral side of the board are formed at positions corresponding to each other when rotated 90 degrees with respect to the center of the board 3. Therefore, the board fitting protrusions 19 and the board fitting holes 21 are arranged symmetrically in the areas facing each other in four areas obtained by dividing the board 3 by two diagonal lines.

  As shown in FIG. 3B, the skeleton block 1 can be fitted not only to the support 5 and the board-side support fitting part 7 but also to the opposing boards 3. That is, the board of the skeleton block 1b in which the board fitting protrusions 19 and the board fitting holes 21 provided on the upper surface (back side) of the board 31 of the skeleton block 1c assembled in an inverted manner are disposed thereon. 3 are fitted into the fitting hole 21 of the substrate on the lower surface and the fitting projection 19 of the substrate, respectively.

  FIG. 4A is a diagram showing the structure inside the column 5. It is desirable that a bent portion 27 a that is bent so as to protrude toward the center of the hole 9 of the column 5 is provided on the inner surface of the tip of the column 5. The bent portion 27 a has a shape in which the tip of the column 5 is bent in the center direction of the column 5. That is, the inner diameter of the tip end of the hole 9 becomes smaller than the other part by the bent portion 27a. The bent portion 27a may be provided on the entire circumference of the hole 9 or may be formed with an interval between the edges of the hole 9. Further, the thickness of the bent portion 27 a is sufficiently thicker than the thickness of the support column 5.

  Moreover, the support | pillar 5 of the frame | skeleton block 1 of this Example is a truncated cone-shaped columnar taper column whose taper angle (theta) is 2-6 degrees toward the front-end | tip from the board | substrate 3. FIG. At this time, the thickness R immediately below the bent portion 27a at the tip of the support column 5 is thicker than the thickness Q at the base of the lower end of the support column 5 (position just above the substrate 3). For example, R is desirably 1.2 times or more than Q.

  Further, as shown in FIG. 4B, a plurality of ribs 29 are formed radially on the lower surface of the bent portion 27a. Note that a plurality of ribs 29 are desirably formed at predetermined intervals in the circumferential direction below the bent portion 27a, and the number and positions of the ribs 29 are determined as appropriate according to the required strength (creep resistance). Is done. By providing the rib 29, the creep deformation resistance of the tip end portion of the column 5 is improved. Further, the inside of the column 5 may be a double cylinder. These variations are within the scope of the skeleton block 1 of the present invention. Incidentally, the skeleton block 1 is generally generally formed by injection molding a resin such as polypropylene so that the skeleton block 1 is low-cost, lighter and easier to transport and assemble.

  FIG. 5 is a diagram showing another form of the support column 5, and FIG. 5A is an example in which a bent portion 27 b is formed. The bent portion 27 b has a shape in which the tip of the support column 5 is bent toward the center of the support column 5 and further bent upward of the support column 5. That is, a protrusion is formed on the upper surface of the column 5. FIG. 5B shows an example in which a bent portion 27c is formed. The bent portion 27 c has a shape in which the tip end of the support column 5 is bent in the center direction of the support column 5 and further bent downward of the support column 5. The tip shape of the column 5 may be any form as long as the strength is improved as described above and a thick portion is formed at the tip of the column 5.

  The skeleton block 1 described above will be described more specifically with reference to FIG. FIG. 6A is a schematic plan view of the skeleton block 1. The substrate 3 is a rectangular plate member whose sides are A and B, respectively. Each of the support portions 5 and the mating portions 7 of the board-side support posts is divided into four sections each divided by a center line 31a perpendicular to the side of length A and a center line 31b perpendicular to the side of length B. Provided. In the example of FIG. 6A, the struts 5 and the mating portions 7 of the substrate-side struts are arranged in opposing areas that are not adjacent to each other across the center point of the substrate 3.

  The center positions (center positions projected onto the plane of the substrate 3) of the support columns 5 and the board-side support fitting portions 7 provided in the area adjacent to the side of the length A are arranged at equal distances from the center line 31a. Is done. In other words, in the example of FIG. 6A, they are arranged on both sides of the center line 31a at positions separated by X1 in a direction perpendicular to the center line 31a. Therefore, it is arranged at an equal distance (X2) from the side of the length B.

  Similarly, the center positions (center positions projected onto the plane of the substrate 3) of the support column 5 and the board-side support column fitting portion 7 provided in the area adjacent to the side of the length B are equidistant from the center line 31b. Placed in. That is, in the example of FIG. 6A, they are arranged on both sides of the center line 31b at positions separated by Y1 in a direction perpendicular to the center line 31b. Therefore, it is arranged at a position equidistant (Y2) from the side of the length A.

  In the present invention, as shown in FIG. 6 (b), X1 and Y1 are preferably A / 4 ± A / 24 and B / 4 ± B / 24 from the centerlines 31a and 31b, respectively. The ranges are A / 4 ± A / 36 and B / 4 ± B / 36. That is, the support 5 and the fitting portion 7 of the board side support are arranged symmetrically with respect to the center of the board in the hatched range of FIG. This is because, for example, when the support portion 5 or the fitting portion 7 of the substrate side support exceeds A / 4 + A / 24 with respect to the center line 31a (when located on the outer peripheral side of the substrate 3), When the shearing force is applied, the strain near the center of the substrate 3 increases.

  Further, when the support portion 5 or the fitting portion 7 of the substrate-side support column is below A / 4-A / 24 with respect to the center line 31a (when positioned on the center side of the substrate 3), the substrate 3 is sheared in the horizontal direction. When a force is applied, the strain near the outer periphery of the substrate 3 increases. Therefore, X1 and Y1 are preferably in the ranges of A / 4 ± A / 24 and B / 4 ± B / 24 from the center lines 31a and 31b, respectively. In addition, since the distortion preventing effect against such a horizontal shearing force is further improved particularly when X1 and Y1 are A / 4 ± A / 36 and B / 4 ± B / 36, X1 and Y1 are A. / 4 ± A / 36 and B / 4 ± B / 36 are particularly desirable, and no deformation of the substrate is observed. For this reason, it is desirable that the support part and the fitting part 7 of the board side support part are located in the above-described range.

  As shown in FIG. 7A, if the substrate 3 is a square, the column 5 and the column 5 are symmetrically positioned in a range of X1 = A / 4 ± A / 24 and Y1 = A / 4 ± A / 24. It suffices if the mating portion 7 of the board side support is located. Moreover, as shown in FIG.7 (b), the support | pillar 5 and the fitting part 7 of a board | substrate side support | pillar may be arrange | positioned so that it may mutually adjoin. Even in this case, the respective arrangement ranges are defined as in FIG. Here, the reference position is a case where the positions of the fitting portion 7 of the support column 5 and the substrate-side support column from the substrate center are X1 = A / 4 and Y1 = A / 4. In this case, the offset amount with respect to the reference position of the center of the support is preferably less than or equal to 1/4 of the reference position A / 4 from the center line of the square substrate, and more preferably about 1/8 of the reference position. is there.

  That is, if this 1/6 offset amount is allowed with respect to the reference length of A / 4, the positions of the support 5 and the board-side support fitting portion 7 are X1 = A / 4 ± A / 24, Y1 = A / 4 ± A / 24, and if the 1/9 offset is allowed with respect to the reference length of A / 4, the support 5 and the board-side support fitting 7 Are in the range of X1 = A / 4 ± A / 36 and Y1 = A / 4 ± A / 36. When the dimensions of the substrate to be described later are 720 mm × 720 mm, the 1/6 offset amount is 30 mm, and the 1/9 offset amount is 20 mm.

  Also, if X1 = A / 4 and Y1 = B / 4 and the respective arrangement is located between the side and the center line, the skeleton blocks are not simply assembled one above the other, but the lower skeleton blocks It is also possible to adopt a so-called staggered arrangement in which the upper skeleton blocks are assembled by shifting by a half pitch in the horizontal direction. Although illustration is omitted, as described above, the arrangement of the board fitting protrusions 19 and the board fitting holes 21 in the board 3 is formed symmetrically with respect to the center lines 31a and 31b.

  Here, as a form of the fitting part 7 of the board | substrate side support | pillar, although a fitting hole as shown in FIG. 1 etc. may be sufficient, various aspects as shown in FIG. 8 may be sufficient. For example, as shown in FIG. 8A, a receiving portion 33 may be provided below the fitting portion 7 of the substrate-side column so as to protrude in the inner peripheral direction of the fitting portion 7 of the substrate-side column. That is, a step may be formed on the side of the substrate 3 that is engaged with the column, and the column 5 may be inserted into the column insertion portion 35. In this case, when the support column 5 is fitted to the mating portion 7 of the substrate side support column, the front end surface of the support column 5 comes into contact with the receiving unit 33. That is, the column 5 is held by the receiving portion 33.

  At this time, if the support column 5 is tapered, the support column 5 is held by the receiving portion 33, and the edge portion (upper edge portion in the figure) of the support column insertion portion 35 comes into contact with the side surface of the support column 5. Even when 33 is deformed or the like, the support column 5 does not penetrate deeply into the fitting portion 7 of the substrate-side support column. Further, by making the inner peripheral surface of the column insertion portion 35 a taper shape corresponding to the taper shape of the outer periphery of the column 5, when the column 5 is inserted into the fitting portion 7 of the substrate side column, the end surface of the column 5 is While being held by the receiving portion 33, the outer surface in the vicinity of the tip portion of the support column 5 is in surface contact with the inner surface of the fitting portion 7 of the substrate side support column, so that the support column 5 can be held more reliably.

  Moreover, as shown in FIG.8 (b), you may form the cylindrical convex part 37 which can insert the support | pillar 5 in the fitting part side with the support | pillar of the board | substrate 3. As shown in FIG. In this case, the column 5 is inserted into the convex portion 37, and the outer peripheral surface of the column 5 is held by the convex portion 37. Further, the tip of the support column 5 comes into contact with the upper surface of the substrate 3 in the inner peripheral direction of the convex portion 37. That is, the upper surface of the substrate 3 in the inner peripheral direction of the convex portion 37 functions as the receiving portion 33. The convex portion 37 has a function as a guide when the support column 5 is inserted and a function of reinforcing the substrate 3 (the mating portion 7 of the substrate side support column) because the cylindrical portion reinforces the cross section of the substrate. Further, by making the inner peripheral surface of the convex portion 37 a taper shape corresponding to the taper shape of the outer periphery of the support column 5, the end surface of the support column 5 is received when the support column 5 is inserted into the fitting portion 7 of the substrate side support column. While being held by the portion 33, the outer surface near the tip of the column 5 comes into surface contact with the inner surface of the fitting portion 7 of the substrate side column, and the column 5 can be held more reliably.

  Further, as shown in FIG. 8C, a convex portion 37 that can be inserted into the hole 9 in the tip end portion of the column 5 may be formed on the side of the substrate 3 where the column 3 is fitted to the column. In this case, the convex portion 37 is inserted into the tip of the column 5 (for example, the inner peripheral portion of the bent portion 27a), and the inner peripheral surface of the column 5 (for example, the inner peripheral surface of the bent portion 27a) is held by the convex portion 37. The Further, the tip of the support column 5 comes into contact with the upper surface of the substrate 3 in the outer peripheral direction of the convex portion 37. That is, the upper surface of the substrate 3 in the outer peripheral direction of the convex portion 37 functions as the receiving portion 33. The convex portion 37 has a function as a guide when the support column 5 is inserted and a function of reinforcing the substrate 3 (the mating portion 7 of the substrate side support column) because the cylindrical portion reinforces the cross section of the substrate. Further, by making the outer peripheral surface of the convex portion 37 a taper shape corresponding to the taper shape of the inner periphery of the hole 9 at the tip of the support column 5, when the support column 5 is inserted into the fitting portion 7 of the substrate side support column, 5 is held by the receiving portion 33, and the inner surface near the tip of the support column 5 is in surface contact with the outer surface of the fitting portion 7 of the substrate-side support column, so that the support column 5 can be held more reliably.

  Further, as shown in FIG. 8D, a convex portion 38 that can be inserted into the fitting hole of the substrate 3 (the fitting portion 7 of the substrate-side column) may be formed at the tip of the column 5. In this case, the convex portion 38 is inserted into the fitting hole of the substrate 3 (the fitting portion 7 of the substrate side column), and the tip end portion of the column 5 is held by the fitting portion 7 of the substrate side column. Further, the outer peripheral side of the convex portion 38 at the tip of the support column 5 is in contact with the upper surface of the substrate 3 (the upper surface of the outer periphery of the fitting hole). That is, the upper surface of the substrate 3 in the outer peripheral direction of the fitting hole functions as the receiving portion 33. The convex portion 38 also has a function as a guide when the support column 5 is inserted. In addition, by making the inner peripheral surface of the fitting hole into a tapered shape corresponding to the tapered shape of the outer periphery of the convex portion 38 at the tip of the column 5, when the column 5 is inserted into the fitting unit 7 of the substrate side column, The end surface of the support column 5 is held by the receiving portion 33, and the outer surface of the convex portion 38 of the support column 5 is in surface contact with the inner surface of the fitting portion 7 of the substrate-side support column, so that the support column 5 can be held more reliably. .

  With the structure as described above, the support column 5 is guided to the mating portion 7 of the substrate side support column and is set at a predetermined position on the substrate. Since there is no displacement, the effect of preventing the skeletal block from shifting is recognized. It should be noted that the various configurations of the board-side column fitting portion 7 described above can be combined with each other. By combining the configurations shown in FIGS. 8A to 8D with each other, it is possible to more surely prevent a shift in the fitting portion between the support column 5 and the fitting portion 7 of the substrate-side support column.

  Moreover, as shown in FIG. 9, you may provide the pipe | tube 39 which is a rod-shaped member in the frame | skeleton block 1 piled up and down as needed. The pipe 39 is for preventing the horizontal displacement of the skeleton block 1. As described above, when the skeleton block 1 is assembled in the vertical direction, the hole 9 communicates in the vertical direction. The pipe 39 is inserted into the communicating hole (hole 9). It is desirable that the pipe 39 has a small play with the hole (that is, an outer diameter slightly smaller than the hole) as long as there is no problem in the insertion property into the hole.

  As the pipe 39, resin, metal, etc. can be used, and if necessary, a plurality of pipes may be added to form a single pipe 39, but a skeleton block incorporated as a structure inside the storage tank Since it is desirable to receive the load with the entire length of the pipe, it is desirable to use a single pipe having no connection point. Moreover, it is not necessary to insert the pipe 39 into all the holes 9 or the like, and the pipe 39 may be inserted into a part of the holes 9 or the like of the arranged skeleton blocks. Here, a weight can be inserted into the pipe to stabilize the lower end of the pipe. It is also possible to fix the lower end portion with concrete or the like placed at the lower end portion of the water storage facility. By doing so, the skeleton block structure can be supported while the pipe is more stable.

  A bent portion 27 a and the like are provided at the tip of the column 5. A pipe 39 is provided so as to penetrate the column 5 positioned in the vertical direction of the skeleton blocks to be stacked, and the skeleton blocks are supported. At this time, the inner diameter of the tip of the hole 9 that is reduced in diameter by the bent portion 27 a or the like is substantially equal to or slightly larger than the outer diameter of the pipe 39. For this reason, inner peripheral surfaces, such as the bending part 27a, contact the pipe 39 outer peripheral surface, and support the pipe 39. FIG. Therefore, the skeleton block 1 is not displaced with respect to the pipe 39, and sufficient strength can be imparted to the distal end portion of the column 5 with respect to the horizontal force received from the pipe 39. In this way, the column 39 can be reinforced by receiving the force received from the tip of the column 5 by the pipe 39 in the event of an earthquake or the like. Further, by adopting such a structure, the displacement of the skeleton block can be absorbed by bending the pipe 39 in the event of an earthquake.

  The bent portion 27a and the like have a shape that allows a large contact area with the pipe 39 so that the pipe 39 can be reliably supported. For example, the bent portion 27a has a shape bent in the vertical direction, and a contact range with the pipe 39 is secured by the vertical portion.

  FIG. 10 is an enlarged schematic view showing a state in which pipes 39 are provided in the fitting portions of the support column 5 shown in FIG. For example, as shown in FIG. 10 (a), a receiving portion 33 is provided below the mating portion 7 of the substrate side strut so as to protrude in the inner peripheral direction of the mating portion 7 of the substrate side strut, and the bent portion 27a. A pipe 39 is provided in contact with the inner peripheral surface. Therefore, the outer peripheral portion of the support column 5 is held by the inner peripheral portion of the mating portion 7 of the board side support column, and the inner peripheral portion of the support column 5 is held by the pipe 39. Is held by the receiving portion 33. Therefore, the support 5 is securely held. Note that the hole diameter of the fitting portion 7 of the board-side column is substantially equal to or slightly larger than the outer diameter of the pipe 39. For this reason, the substrate 3 is also held by the pipe 39.

  Further, as shown in FIG. 10B, a cylindrical convex portion 37 into which the column 5 can be inserted is provided on the side of the substrate 3 where the column 3 is fitted with the column, and is in contact with the inner peripheral surface of the bent portion 27a. A pipe 39 is provided. Accordingly, the outer peripheral portion of the support column 5 is held by the inner peripheral portion of the convex portion 37, the inner peripheral portion of the support column 5 is held by the pipe 39, and the tip end portion of the support column 5 is received by the receiving portion 33 in the vertical direction. Retained. Further, the hole diameter of the fitting portion 7 of the board side support column is substantially equal to or slightly larger than the outer diameter of the pipe 39. For this reason, the substrate 3 is also held by the pipe 39.

  Further, as shown in FIG. 10C, a convex portion 37 that can be inserted into the hole 9 in the tip end portion of the column 5 is formed on the side of the substrate 3 where the column 3 is fitted to the column, and the inner peripheral surface of the convex portion 37. A pipe 39 is provided so as to be in contact with. Accordingly, the convex portion 37 that holds the inner peripheral portion of the support column 5 is held by the pipe 39, and the tip end portion of the support column 5 is held by the receiving portion 33 in the vertical direction. Note that the hole diameter of the fitting portion 7 of the board-side column is substantially equal to or slightly larger than the outer diameter of the pipe 39. For this reason, the board | substrate 3 and the convex part 37 are also hold | maintained by the pipe 39. FIG.

  Further, as shown in FIG. 10 (d), a convex portion 38 that can be inserted into the fitting hole of the substrate 3 (the fitting portion 7 of the substrate-side column) is formed at the tip of the column 5, and the projection 38 (folding) is formed. A pipe 39 is provided so as to contact the inner peripheral surface of the bent portion 27b). Therefore, the outer peripheral portion of the support column 5 is held by the inner peripheral portion of the mating portion 7 of the board side support column, and the inner peripheral portion of the support column 5 is held by the pipe 39. Is held by the receiving portion 33.

  In this way, the pipe 39 is supported by the receiving portion 27a and the like, and the pipe 39 can be held at two places above and below the unit structure of a pair of skeleton blocks that are combined vertically.

  As described above, according to the skeleton block 1 according to the present embodiment, the front end of the support column 5 can be fitted directly with the fitting part 7 of the substrate-side support column provided on the substrate 3, and therefore, particularly in the horizontal direction. Extremely high strength against shearing force. In addition, since the arrangement range of the support portion 5 and the fitting portion 7 of the board side support column is set to a range of A / 4 ± A / 24 with respect to the length of each side (A is the length of the side), the balance is excellent. Deformation and breakage are prevented even with respect to horizontal shearing force. In addition, since the base of the column has a taper of a predetermined angle, stress concentration at the column base can be reduced.

  Moreover, since the board | substrate fitting protrusion 19 and the board | substrate fitting hole 21 in which board | substrates 3 can also be fitted are formed, when the frame | skeleton block 1 is assembled, a board | substrate shift | offset | difference does not arise easily.

  Moreover, since the support | pillar 5 has a taper shape in which a front-end | tip diameter is reduced and the thickness of the support | pillar 5 goes thick as it goes to a front-end | tip, a diameter is smaller with respect to the force of the perpendicular direction concerning a support | pillar 5 The wall thickness is thick at the tip of the column 5, and the wall thickness is thin at the base of the column 5 having a large diameter, so that the cross-sectional area receiving the force does not change greatly at an arbitrary position in the vertical direction of the column. For this reason, the force in the vertical direction can be reliably transmitted to the substrate 3 side, buckling and the like can be prevented, and excessive thickness can be reduced to reduce cost and weight.

  Further, a bent portion 27a or the like protruding in the inner peripheral direction is provided at the tip of the support column 5. For this reason, while the intensity | strength of the support | pillar front-end | tip improves, when the frame | skeleton block 1 is assembled, water and air do not accumulate in it. Moreover, since the protrusion 27a has strength, for example, a reinforcing bar or the like can be inserted into the assembled skeleton block.

  Moreover, since the receiving part 33 is provided in the fitting part 7 of a board | substrate side support | pillar, when the support | pillar 5 is inserted, the support | pillar 5 can be hold | maintained reliably. At this time, in consideration of the taper shape of the column 5, the outer diameter of the position from the tip of the column 5 corresponding to the fitting margin of the column 5 to the fitting part 7 of the substrate side column and the edge of the column insertion unit 35 By making the diameters of the columns 5 correspond to each other, the column 5 can be received at the edges of the receiving portion 33 and the column insertion portion 35, and the inner peripheral surface of the fitting portion 7 of the substrate side column is made to correspond to the taper shape of the column 5. If so, the column 5 can be held more reliably.

Further, by providing the pipe 39 penetrating the skeleton block 1, the skeleton blocks 1 are aligned in the vertical direction and do not shift in the horizontal direction. For this reason, the skeleton block 1 is not displaced in the horizontal direction even with respect to a horizontal force or the like, and there is no fear of a decrease in strength associated therewith. Furthermore, by providing the receiving portion 27a provided on the inner surface of the support column 5 of the skeleton block 1 and the convex portions 37 and 38 for holding the support column 5, the pipe 39 securely holds the skeleton block, and the lateral displacement of the skeleton block 1 or the like. And rotation can be prevented.
As described above, the skeletal block of the present invention has a substrate-pipe, strut-and-pipe connection, in addition to the substrate-to-substrate fitting as shown in FIG. 3 and the substrate-to-post fitting as shown in FIG. Mating is possible. In particular, the fitting between the substrate and the pipe and the support and the pipe via the pipe is particularly effective when a lateral load is applied. As a result, a strong and stable skeleton block assembly structure (skeleton block structure) is obtained.

A loading test was performed on the skeleton block according to the present invention. As shown in FIG. 1, a pair of skeleton blocks 1 are arranged such that the front ends of the columns and the bases of the columns are opposed to the substrate in the vertical direction, and the fitting portions of the columns and the substrate side column formed on the substrate are arranged. to specimens formed by assembling are fitted to each other, the vertical direction to 220kN / m ^2, the horizontal shear direction performs loading of up to 5 kN / m ^2, was observed status of the backbone blocks. In addition, in order to reproduce the situation where the skeleton block 1 was installed on the uneven ground, the skeleton block was intentionally tilted about 2 degrees and loaded in the vertical direction in the same manner (that is, 2 with respect to the column axis of the skeleton block). The loading was performed at an oblique angle). The skeleton block 1 has a substrate size of 720 mm × 720 mm and a column height of 390 mm. Moreover, the diameter of the base part of the support | pillar was 180 mm. Moreover, the position of the fitting part of a support | pillar and a board | substrate side support | pillar used the thing of X1 = X2 and Y1 = Y2 of Fig.7 (a). The skeleton blocks were all made of polypropylene resin.

The skeleton block subjected to the test was changed in the taper angle of the support, the thickness of the support, and the thickness ratio in the vicinity of the tip with respect to the vicinity of the base of the support (hereinafter simply referred to as “thickness ratio”). Here, the taper angle corresponds to θ in FIG. 4, and the thickness of the column is the thickness in the middle of the column. Further, the thickness ratio is R / Q in FIG. The buckling situation at this time was observed visually. The test conditions (skeleton block shape) and results are shown in Table 1. Note that the vertical load resistance indicates the result when the load is applied straight to the axis of the column, and the shear resistance load is the state in which the lowermost substrate is held in a horizontal state and fixed at the uppermost portion. The result when a load is applied to the uppermost substrate in a direction perpendicular to the axis of the column while the substrate is kept horizontal is shown. The diagonal load resistance indicates a result when a load is applied from a direction inclined about 2 degrees with respect to the support shaft.

The loading efficiency is whether or not the skeleton blocks (supports) can be stacked. In addition, a structure in which eight radial ribs are formed at equal intervals in the circumferential direction under the support column tip protrusion 27a of the skeleton block due to deformation of the block tip due to the skeleton block receiving a vertical load for a long time, For those that did not, the creep resistance at the end of the column was investigated. Eight ribs with a width of 3.5 mm were provided at intervals of 45 degrees. During the test, the creep resistance of the skeleton block was examined by examining the deformation occurring at the tip before and after the start of the test after applying a vertical load of 31 kN / m ² to the skeleton block for one year and removing the load after one year.

  The case where buckling, breakage, deformation, etc. of the column were observed by visual inspection was designated as “X”, and the case where no buckling was observed was designated as “◯”. Moreover, it was set as (circle) when the skeleton block could be piled up, and was set as x when it could not be overlapped. In addition, it was set as (triangle | delta) that the support | pillars overlap in general, although it does not overlap completely.

  As is apparent from the table, the vertical load resistance is better when the taper angle is smaller. For example, when the thickness is 3 mm and the thickness ratio is 1.0, buckling was confirmed to be 4 degrees or more. Similarly, buckling was confirmed even when the wall thickness was increased to 4.0 mm and the wall thickness ratio was 1.0. If the taper angle was 2 degrees or less, buckling could not be confirmed.

  On the other hand, buckling did not occur at a taper angle of 4 degrees at any wall thickness by setting the wall thickness ratio to 1.1 or more. Furthermore, if the wall thickness ratio was 1.2 or more, buckling was not confirmed even at a taper angle of 6 degrees. Therefore, as the vertical load resistance, it is desirable that the taper angle is small, and it is desirable that the taper angle is 6 degrees or less. Further, it is desirable that the thickness ratio is large.

  The greater the taper angle, the better the shear resistance. At a taper angle of 0 degrees, deformation or breakage was confirmed at the base of the column. Therefore, it is desirable that the taper angle is large (2 degrees or more) as the shear resistance.

  Although the oblique load resistance depends on the load angle, breakage occurred at a taper angle of 0 degree. It is better to have a certain taper angle for the anti-diagonal load, but if the taper angle is too large, buckling occurs as in the case of the vertical load. For this reason, the taper angle is preferably about 2 to 6 degrees with respect to the oblique load resistance.

  When the taper angle is 0 degree, the skeleton blocks (columns) cannot be overlapped, and the loading efficiency is extremely poor. When the taper angle is 2 degrees, the strut can be inserted into the strut, and when it is 4 degrees or more, the skeleton blocks can be completely overlapped. For this reason, it is desirable that the taper angle be at least 2 degrees.

  From the above, if the wall thickness ratio is 1.2 or more, the vertical load resistance, shear load resistance, diagonal load resistance, and loading efficiency are excellent at a taper angle of 2 to 6 degrees, and both functions can be achieved. If the wall thickness ratio is 1.5 or more, there is a problem of an increase in resin weight or cost. Therefore, the wall thickness ratio is desirably 1.2 to 1.4. In particular, by appropriately combining the taper angle and the wall thickness ratio, it is possible to obtain a skeleton block that is excellent in load resistance and loading efficiency even at a thinner wall thickness. That is, since the thickness of the skeleton block can be reduced, a skeleton block having excellent cost and weight reduction and excellent strength in the vertical direction can be obtained. Similar results are obtained even when the positions of the fitting portions of the support column and the substrate-side support column are within the ranges shown in FIG. 6B (X1 = A / 4 ± A / 24, Y1 = B / 4 ± B / 24). Was obtained.

Furthermore, in any of the vertical load resistance, shear load resistance, and oblique load resistance tests shown in Table 1, radial ribs are provided below the column end protrusions 27a for all combinations of skeleton blocks that have obtained good results. Using 8 pieces of ribs with a rib length of 25 mm x rib thickness of 3 mm x rib height of 50 mm evenly in the circumferential direction, a vertical load of 31 kN / m ² was applied for 1 year, and the dents on the tip end of the column were As a result of the investigation, it was found that the rib formed on the lower side of the columnar tip protrusion 27a was not deformed even after one year and the creep resistance was improved.

  In this test, the thickness of the ribs is 3.0 mm x 8 and the total thickness is 24 mm. This is about 20% of the circumferential length of about 140 mm at the rib installation position at the end of the column used for the test. Become. In other words, if the total width of the ribs is 20% or more of the total circumference of the support tip (rib arrangement position), high creep resistance can be obtained. In this case, the number of ribs is desirably 8 or more. This is because the effect of dispersing stress increases as the number of ribs formed on the circumference increases. In the above-described conditions, the rib may be 6 mm or thicker. Further, instead of forming a plurality of ribs at equal intervals, they may be formed on the entire circumference (that is, a rib having a thickness of 100% of the total length of the support tip portion). Although the angle of the rib is not specified, it is preferably 45 degrees or more and 80 degrees or less with reference to the horizontal plane, but more preferably 60 degrees or more and 75 degrees or less.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

DESCRIPTION OF SYMBOLS 1 ......... Frame block 3 ......... Substrate 5 ......... Post 7 ......... Fitting part 9 of the substrate side post ......... Hole 11 ......... Hole 19 ......... Fitting protrusion 21 of the substrate ......... Fitting holes 27a, 27b, 27c of the board ......... bending portion 29 ......... ribs 31a, 31b ......... center line 33 ......... receiving portion 35 ......... post insertion portions 37, 38 ......... convex portion 39 ......... Pipe 40 ......... Rainwater storage tank 41 ......... Frame block 43 ......... Ground 45 ......... Coating layer 47 ......... Horrow 49 ... …… Inlet 51 ... …… Outlet 61 ... …… Substrate 63 ......... Pole 65 ......... Hole 67 ......... Hole 69 ......... Recess 71 ......... Protrusion

2nd invention uses the frame | skeleton block concerning 1st invention, The said board side fitting part protrudes in the said support | pillar side of the said board | substrate which can hold | maintain the outer periphery and / or inner periphery of the front-end | tip part of the said support | pillar A pair of the skeleton blocks, the substrate surfaces on which the columns are erected are opposed to each other, and at least one of the outer periphery or the inner periphery of the ends of the pair of columns of the one skeleton block is the other The pair of board-side fitting portions of the skeleton block are fitted to the convex portions, and at least one of the outer circumference or the inner circumference of the pair of struts of the other skeleton block is the pair of the skeleton blocks. A skeleton block assembly structure that prevents the skeleton block assembly structure from being displaced and improves the strength of the substrate by adopting the assembly structure of the skeleton block that is fitted to the convex portion of the board side fitting portion.
A rod-shaped member that penetrates the support column and the board-side fitting portion may be provided.

4th invention uses the frame | skeleton block concerning 1st invention, makes the board | substrate surface in which the said support | pillar stood facing a pair of said skeleton blocks, and makes the other end the front-end | tip of a pair of said support | pillar of one frame | skeleton block The pair of board-side fitting parts of the other skeleton block is fitted to the pair of board-side fitting parts of the one skeleton block, and the assembled. A method for improving a shear load or an oblique load of a skeleton block assembly structure, wherein a plurality of pairs of skeleton blocks are arranged in a plurality of horizontal directions and vertical directions.
A rod-shaped member that penetrates the support column and the board-side fitting portion may be provided.
5th invention uses the frame | skeleton block concerning 1st invention, makes the board | substrate surface in which the said support | pillar stood facing a pair of said skeleton blocks, and makes the other end the front-end | tip of a pair of said column of one frame | skeleton block The pair of board-side fitting parts of the other skeleton block is fitted to the pair of board-side fitting parts of the one skeleton block, and the assembled. A method for preventing buckling of a skeleton block assembly structure, wherein a plurality of pairs of skeleton blocks are arranged in a plurality of horizontal directions and vertical directions.

Claims (8)

A digging hole provided by digging down the ground and having an open top, a space holding skeleton block structure configured by assembling a plurality of resin skeleton blocks disposed in the digging hole, and an upper part of the digging hole A skeleton block used in a rainwater storage facility having a covering layer covering the opening of
A square substrate or a rectangular substrate, a pair of support columns erected on the substrate, and a pair of substrate sides provided on the substrate on the side where the support columns are erected so that the ends of the columns can be fitted Having a fitting portion,
When making the pair of skeleton blocks face each other on which the support surfaces are erected, the front ends of the struts of one skeleton block can be fitted to the board-side fitting portion of the other skeleton block,
The taper angle of the column is 2 to 6 °, and the column has a taper shape with a diameter decreasing toward the tip, and the wall thickness is further toward the tip with respect to the thickness at the base of the column. The thickness at the base portion of the support column is 1.2 times or more and 1.4 times the thickness of the bent portion that is bent in the center direction of the support column at the tip end portion of the support column. A skeleton block characterized by being double or less. The support column and / or the board-side fitting portion includes a first center line parallel to one side of the board and a first center line parallel to the other side of the board and perpendicular to the first center line. It is formed in four areas each divided by two centerlines,
The center position of the support column and / or the board-side fitting portion is arranged at a position of a distance X1 in a direction perpendicular to both sides from the first center line perpendicular to the side of the length A of the board, Each of the substrates is disposed at a distance Y1 in a direction perpendicular to both sides with respect to the second center line perpendicular to the length B side of the substrate.
The skeleton block according to claim 1, wherein X1 = A / 4 ± A / 24 and Y1 = B / 4 ± B / 24. The substrate is square;
On the back surface of the substrate, a fitting protrusion and a fitting hole capable of fitting with the fitting protrusion are provided,
The fitting protrusion and the fitting hole are each divided into four sections divided by a first center line parallel to one side of the substrate and a second center line perpendicular to the first center line. At least one outer peripheral edge of each substrate is formed symmetrically with respect to each of the first center line and the second center line, and is opposed to a region divided by two diagonal lines of the substrate. The fitting holes are formed at positions corresponding to the fitting protrusions when rotated 90 degrees from the center of the substrate as a starting point. 2. The skeleton block according to claim 1, wherein the skeleton block has a structure in which the base portions of the columns can be arranged in a direction facing the substrate in the vertical direction.   The board-side fitting portion includes at least a hole into which the tip end portion of the support column can be fitted, or a protrusion protruding toward the support column side of the substrate capable of holding the outer periphery and / or inner periphery of the tip end portion of the support post. The skeleton block according to claim 1, which has any one of the following parts.   The skeleton block according to claim 1, wherein a rib is formed on an inner surface of the support column below the bent portion. Using the skeleton block according to claim 1,
The board side fitting part is a convex part protruding to the column side of the board capable of holding the outer periphery and / or inner periphery of the tip part of the column,
A pair of the skeleton blocks are opposed to each other on the substrate surfaces on which the columns are erected,
Either at least the outer periphery or the inner periphery of the ends of the pair of struts of one skeleton block is fitted to the convex portions of the pair of board-side fitting portions of the other skeleton block,
An assembly structure of a skeleton block in which at least either the outer periphery or the inner periphery of the ends of the pair of struts of the other skeleton block is fitted to the convex portions of the pair of board-side fitting portions of the one skeleton block. Thus, a skeleton block assembly structure that prevents the skeleton block assembly structure from shifting and improves the strength of the substrate. In the space holding skeleton block structure formed by assembling a plurality of resin skeleton blocks using the skeleton block according to claim 5, ribs are formed on the inner surfaces of the columns below the bent portions. A method for improving the creep resistance of a skeleton block, which prevents the formation of a dent at the tip of the skeleton block due to the above. Using the skeleton block according to any one of claims 1 to 5,
A pair of the skeleton blocks are opposed to each other on the substrate surfaces on which the columns are erected,
The front ends of the pair of struts of one skeleton block are fitted to the pair of board-side fitting portions of the other skeleton block, and the front ends of the pair of struts of the other skeleton block are paired with the pair of the skeleton blocks. Fit to the board side fitting part,
A method for improving a shear load or an oblique load of a skeleton block assembly structure, wherein the assembled pair of skeleton blocks are arranged in a plurality of horizontal and vertical directions.

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