JP5992710B2 - Filling material for underground water tank - Google Patents

Description

  The present invention relates to a filling member for a groundwater tank, and more particularly to a filling member that is disposed in a horizontal direction and a vertical direction to form a void structure inside a groundwater tank.

  As a filling member constituting the void structure inside the underground water tank, for example, four legs are protruded from the four corners of a square base portion, and convex portions are respectively provided on the two legs in a diagonal relationship. There is known a unit member that is formed and provided with a recess in each of two legs that are in the positional relationship of the other diagonal line (Patent Document 1).

  The unit member of the above-mentioned patent document 1 connects one unit member upside down, butts the front end surfaces of each leg body, and connects the unit members by inserting the convex part of the leg body into the concave part to connect the unit members to each other in the vertical direction. Are arranged.

JP 2000-352080 A

  However, when the unit member of Patent Document 1 is turned upside down, the convex portion and the convex portion or the concave portion and the concave portion may face each other depending on the positional relationship of the legs. Since the upper and lower unit members cannot be connected unless the unit members are rotated by 90 ° in plane, the workability is not very good.

  The present invention has been made in view of the above problems, and the problem to be solved is a workability that can be disposed in the horizontal direction and the vertical direction without worrying about the positional relationship of the connecting portion of the filling member. The object is to provide a good filling member for underground water tank.

In order to achieve the above object, a filling member for a groundwater tank according to the present invention is a filling member that is disposed in a horizontal direction and a vertical direction to form a void structure inside a groundwater tank, and the filling member includes: co the side surfaces are arranged in the horizontal direction are combined, are combined the tips of the legs projecting from the other horizontal surface of one of the horizontal plane and between the filling member of the filling member, a plane disposed vertically It has a substantially regular n-gon shape (n is an integer of 3 or more), and n filling member constituent units each having a connecting portion are shifted by (360 / n) ° from the center of rotation of the filling member without gaps. The connecting portion includes at least a pair of connecting convex portions and a connecting concave portion, and all the connecting convex portions and the connecting concave portions formed in one filling member constituent unit are adjacent to each other. Based on the boundary line with the filling material component unit Positioned symmetrically, it is located all the connecting recess and the connecting protrusions formed in another filling member structural units adjacent to the distal end surface of the leg portion formed in each filler member construction unit, at least one pair of A connection convex part and a connection concave part are formed .

In the filling member for a groundwater tank according to the present invention, the filling member includes a plurality of legs protruding from one horizontal surface of the horizontal board part and the horizontal board part, and the leg parts are provided for each filling member constituent unit. And at least one pair of connecting projections on the distal end surface of the leg formed at the substantially center, and at least one of the filling members straddling all the filling member structural units. A connecting recess is preferably formed, and n = 4 is the most preferable form.

Like the underground water tank filling member of the present invention, the filling member constituent unit having the connecting portion is arranged by n (360 / n) degrees shifted from the rotation center of the filling member without gaps. In addition, the connecting portion includes at least a pair of connecting convex portions and a connecting concave portion, and another adjacent filling member configuration of all the connecting convex portions and the connecting concave portions formed in one filling member constituting unit. If all the connecting recesses and connecting protrusions formed in another adjacent filling member constituent unit are positioned in a line-symmetrical position with respect to the boundary line with the unit, they are arranged without worrying about the directionality of the connecting part. Even if it is provided , it is possible to connect the filling members in the horizontal direction and the vertical direction without facing the connecting convex portion and the connecting convex portion or the connecting concave portion and the connecting concave portion, and it is formed for each filling member constituent unit. At least a pair of connecting projections on the front end surface of the leg Since the connecting recesses are formed, when the filling members are arranged in the vertical direction with the tips of the legs aligned, the connecting protrusions and the connecting recesses on the leg tip surfaces of the upper filling member constituent units are The filling member can be stably disposed in the vertical direction in a state in which each filling member constituent unit is connected to the connecting concave portion and the connecting convex portion on the front end surface of the leg portion of each filling member constituent unit and is supported by the leg portion. Therefore, workability is very good.

Further, the filling member includes a plurality of legs protruding from one horizontal surface of the horizontal board part and the horizontal board part, and the leg parts are at least one for each filling member constituent unit and all the filling parts. For a groundwater tank in which one member is formed at substantially the center of the filling member straddling the member structural unit, and at least n pairs of connecting protrusions and connecting recesses are formed on the front end surface of the leg portion formed at the approximately center. When the filling member is arranged in the vertical direction with the tips of the leg portions aligned, the filling member has at least n pairs of connecting projections and connecting recesses formed on the tip end surface of the upper center of the upper filling member. Are connected to at least n pairs of connecting recesses and connecting projections formed on the front end surface of the substantially central leg of the lower filling member, and all of the filling member structural units are evenly formed by the legs formed in the approximate center. Because it is supported, stability can be increased and sufficient strength can be obtained. That.

  And it is the most preferable form as a filling member which forms the space | gap structure inside a groundwater tank as a filling member for groundwater tanks which is n = 4, ie, a filling member is square, and workability is also good.

BRIEF DESCRIPTION OF THE DRAWINGS The filling member for groundwater tanks which concerns on one Embodiment of this invention is shown, Comprising: (a) is a perspective view from a plane, (b) is a perspective view of the state reversed up and down. The structural unit of the filling member is shown, in which (a) is a plan view and (b) is a bottom view. It is a schematic side view showing an example of a void structure inside the underground water tank formed by arranging the filling members in the horizontal direction and the vertical direction, and only the connecting convex portion located at the forefront is represented by a broken line. It is a thing. It is the schematic plan view which showed the connection state of the horizontal direction (vertical / horizontal direction) of the filling member with the outline. It is a schematic perspective view which shows another form of the connection convex part of the same filling member, and a connection recessed part, Comprising: (a) The connection convex part and connection recessed part of the leg part provided for every filling member structural unit, (b) is filling It is the connection convex part and connection concave part of the leg part provided in the approximate center of a member. It is a top view which shows the structural unit of the filling member for underground water tanks which concerns on other embodiment of this invention. It is a fragmentary perspective view of the filling member. It is a partial side view which shows the connection state of the filling member and the filling member which adjoins diagonally.

  Hereinafter, an embodiment of a filling member for underground water tank according to the present invention will be described in detail based on the drawings.

  A filling member 10 for a groundwater tank according to the present invention shown in FIG. 1 is injection-molded with a thermoplastic resin such as polypropylene, and includes a square horizontal plate portion 1 and a plurality of leg portions 2. . The planar shape of the horizontal platen 1 is not limited to a square as long as it is a regular n-gon (n is an integer of 3 or more). For example, it may be a regular triangle or a regular pentagon. Like a form, the square horizontal board | plate part 1 is the most preferable shape as a filling member which forms the space | gap structure body in a groundwater tank.

  As shown in FIGS. 1A and 1B, the horizontal plate portion 1 is formed by forming a lattice portion 1b that intersects in the vertical and horizontal directions inside a square quadrilateral frame portion 1a. Water can move up and down through the opening. The four corners and the central opening of the lattice portion 1b are closed, and a hollow leg portion 2 protruding downward is integrally formed in each closed portion 1c. Since the base end (upper end) and the distal end (lower end) of the leg portion 2 are opened, water can move up and down in the leg portion 2 as well.

  In addition, the leg 2 is not formed integrally with the closing part 1c of the horizontal board part 1, but a fitting hole is formed in the closing part 1c, and the leg part 2 manufactured separately is fitted and fixed to the fitting hole of the closing part 1c. Alternatively, a water passage hole (not shown) may be formed in the peripheral wall of the hollow leg portion 2 so that water can freely enter and exit inside and outside the leg portion 2. Moreover, the horizontal board | plate part 1 may form what formed many water flow holes in the square flat plate.

  As shown in FIGS. 3 and 4, the filling member 10 for the underground water tank according to this embodiment is arranged side by side in the horizontal direction (longitudinal and lateral directions) while aligning the side surfaces of the horizontal platen 1 and is filled upside down. Legs 2 protruding from one horizontal surface (upper surface) of each horizontal plate portion 1 and the other horizontal surface (lower surface) of each horizontal plate portion 1 by alternately stacking members 10 and filling members 10 that are not inverted upside down. By arranging them in the vertical direction (vertical direction) while aligning the front end surfaces of each other, a void structure is formed inside a groundwater tank such as a rainwater storage tank or rainwater infiltration tank. Since it is connected in the horizontal and vertical directions by the connecting part 3 for horizontal connection (for vertical and horizontal connection) and the connecting parts 4 and 5 for vertical connection (for vertical connection) described later, a strong void structure is constructed. What can be done A.

  As shown in FIGS. 2A and 2B, the connecting portion 3 for horizontal connection (for vertical and horizontal connection) and the connecting portions 4 and 5 for vertical connection (for vertical connection) have a filling member configuration. The filling member 10 for groundwater tank according to the present invention is formed in the unit T, and the filling member structural unit T having the connecting portions 3, 4, 5 is located at the rotation center O of the filling member 10 (360 / n) It is configured such that n pieces are arranged with a gap and are not spaced. Since the filling member 10 of the present embodiment is square, that is, n = 4, the filling member structural unit T including the connecting portions 3, 4, and 5 is (360/4) ° at the rotation center O of the filling member 10. = 90 ° and shifted by 90 ° with no gaps.

  As shown in FIGS. 1 and 2 (a), the connecting portion 3 for horizontal connection (for vertical and horizontal connection) formed for each filling member structural unit T has a dovetail connection convex portion 3a, Corresponding dovetail-shaped connecting recesses 3b are provided, and the connecting projections 3a and the connecting recesses 3b are respectively formed on the side surfaces on both sides of the corner of the horizontal plate part 1. Then, this filling member structural unit T (here, the upper right filling member structural unit T indicated by a solid line in FIG. 2A) is rotated 90 ° counterclockwise from the rotation center O of the filling member 10 as a base point. In this case, the connecting convex portion 3a and the connecting concave portion 3b of the upper left filling member constituent unit T are positioned 180 ° counterclockwise at the positions of the connecting convex portion 3a and the connecting concave portion 3b of the upper right filling member constituent unit T. The connecting convex portion 3a and the connecting concave portion 3b of the lower left filling member structural unit T at the rotated position, and the connecting convex portion 3a of the lower right filling member structural unit T at the position rotated 270 ° counterclockwise. Each of the connecting recesses 3b is formed.

  And the connection convex part 3a and the connection recessed part 3b of the connection part 3 formed in this filling member structural unit T also have the following relationship. That is, as shown in FIG. 2A, the boundary line L1 between the connecting convex portion 3a and the connecting concave portion 3b formed in the upper right filling member constituent unit T and the adjacent upper left filling member constituent unit T is used as a reference. The connecting concave portion 3b and the connecting convex portion 3a formed in the upper left filling member structural unit T are positioned so as to be positioned in line symmetry. Further, the lower right corner of the connecting convex portion 3a and the connecting concave portion 3b formed in the upper right filling member constituent unit T is located in a line-symmetric position with respect to the boundary line L2 between the adjacent lower right filling member constituent unit T. The connecting concave portion 3b and the connecting convex portion 3a formed in the filling member structural unit T are positioned.

  Next, as shown in FIG. 1 (a) and FIG. 2 (a), the vertical connection (upper and lower connection) connection portion 4 formed in each filling member structural unit T is a horizontal plate 1 These are formed on the upper surface of the closed portion 1c at the four corners, and are provided with a cylindrical connecting convex portion 4a and a circular hole-shaped connecting concave portion 4b corresponding thereto. Similarly to the connecting portion 3 for horizontal connection, the connecting portion 4 for vertical connection (the connecting convex portion 4a and the connecting concave portion 4b) has the filling member constituent unit T (upper right filling member constituent unit T) as the filling member 10. The upper left filling member constituent unit T is located at the position of the connecting portion 4 (the connecting convex portion 4a, the connecting concave portion 4b) of the upper right filling member constituent unit T when rotated 90 ° counterclockwise with the rotation center O as the base point. The connecting portion 4 (the connecting convex portion 4a and the connecting concave portion 4b) of the lower left filling member constituent unit T is located at a position rotated 180 ° counterclockwise. However, the lower right connecting portion 4 (connecting convex portion 4a, connecting concave portion 4b) is formed at a position rotated 270 ° counterclockwise.

  And the connection convex part 4a and the connection recessed part 4b of this connection part 4 are also the boundary of the adjacent upper left filling member structural unit T of the connection convex part 4a formed in the upper right filling member structural unit T and the connection recessed part 4b. Formed in the upper right filling member constituent unit T so that the connecting concave portion 4b and the connecting convex portion 4a formed in the adjacent upper left filling member constituent unit T are positioned at a line symmetrical position with respect to the line L1. The connection formed in the lower right filling member constituent unit T at a line-symmetrical position with respect to the boundary line L2 between the connected connecting convex portion 4a and the connecting concave portion 4b with the adjacent lower right filling member constituent unit T. The concave portion 4b and the connecting convex portion 4a are formed so as to be positioned.

  On the other hand, on the front end surface of the leg 2 formed at the four corners of the back surface of the horizontal board portion 1, as shown in FIG. 1 (b), a cylindrical connecting convex portion 5a having a smaller diameter than the connecting convex portion 4a. And the connection part 5 provided with the circular hole-shaped connection recessed part 5b corresponding to it is formed. As shown in FIG. 2 (b), the connecting protrusion 5a and the connecting recess 5b of the connecting portion 5 formed on the distal end surface of the leg portion 2 are also shown in FIG. When the structural unit T is rotated 90 ° counterclockwise with the rotation center O of the filling member 10 as the base point, the upper left filling member structure is located at the position of the connecting convex portion 5a and the connecting concave portion 5b of the upper right filling member structural unit T. The connecting convex portion 5a and the connecting concave portion 5b of the unit T are further rotated counterclockwise by the connecting convex portion 5a and the connecting concave portion 5b of the lower left filling member constituting unit T at a position rotated by 180 ° counterclockwise. A connecting convex portion 5a and a connecting concave portion 5b of the lower right filling member constituent unit T are formed at positions rotated by 270 °, respectively.

  And the connection convex part 5a and the connection recessed part 5b of this connection part 5 are also the boundary of the connection convex part 5a formed in the upper right filling member structural unit T and the adjacent upper left filling member structural unit T of the connection recessed part 5b. It is formed so that the connecting concave portion 5b and the connecting convex portion 5a formed in the upper left filling member constituent unit T are positioned at a line symmetrical position with respect to the line L1, and is formed in the upper right filling member constituent unit T. The connecting concave portion 5b formed in the lower right filling member constituent unit T at a line-symmetrical position with respect to the boundary line L2 between the connecting convex portion 5a and the connecting concave portion 5b with the adjacent lower right filling member constituent unit T. And the connecting convex part 5a is formed. As described above, the connecting convex portion 5a and the connecting concave portion 5b of the upper right filling member constituent unit T and the connecting concave portion 5b and the connecting convex portion 5a of the upper left filling member constituent unit T are line-symmetric with respect to the boundary line L1. In relation to the positional relationship, the connecting concave portion 5b and the connecting convex portion 5a of the upper left filling member constituent unit T and the connecting convex portion 5a and the connecting concave portion 5b of the lower left filling member constituent unit T are line-symmetric with respect to the boundary line L2. In the positional relationship, the connecting convex portion 5a and connecting concave portion 5b of the lower left filling member constituent unit T and the connecting concave portion 5b and connecting convex portion 5a of the lower right filling member constituent unit T are line-symmetric with respect to the boundary line L1. , The connecting concave portion 5b and connecting convex portion 5a of the upper right filling member constituent unit T and the connecting convex portion 5a and connecting concave portion 5b of the lower right filling member constituent unit T are lines based on the boundary line L2. It has a symmetrical positional relationship.

  Moreover, as shown to (b) of FIG. 1, (b) of FIG. 2, in the front end surface of the leg part 2 formed in the approximate center of the filling member 10 straddling four filling member structural units T, A plurality of connecting projections 5a and a plurality of connecting recesses 5b are formed. A pair of the connecting projections 5a and the connecting recesses 5b are formed in each filling member structural unit T, and the total filling member 10 for the underground water tank has a total of four pairs of connecting projections 5a and connecting recesses 5b. . The pair of connecting protrusions 5a and connecting recesses 5b formed in each of the filling member constituent units T are also formed at overlapping positions when rotated by (360/4) ° = 90 ° from the rotation center O of the filling member 10 as a base point. In addition, the connection recess 5b and the connection protrusion 5a are formed at positions symmetrical with respect to the boundary lines L1 and L2, respectively.

In the present embodiment, the connecting portion 5 formed on the distal end surface of the leg portion 2 is a columnar connecting convex portion 5a and a circular hole-shaped connecting concave portion 5b, but rotates by 90 ° as described above. If it is formed in an overlapping position and is in a line-symmetrical positional relationship and the end surfaces of the legs 2 and 2 are fitted to each other, the shape is not limited to this. For example, FIG. As shown, an unevenness may be formed on the distal end surface of the leg portion 2, and the unevenness may be a connecting convex portion 5a and a connecting concave portion 5b. The leg 2 shown in (a) of FIG. 5 (a type in which two pairs of connecting projections 5a and connecting recesses 5b are formed) is provided at the four corners of the horizontal board 1 and is shown in FIG. ) Shown in FIG. 4 (a type in which four pairs of connecting convex portions 5a and connecting concave portions 5b are formed) is provided at the center of the horizontal board portion 1, and is connected to the connecting convex portions 5a of the leg portions 2. Is provided with an opening for water flow.
When such unevenness is used as the connection protrusion 5a and the connection recess 5b, a small protrusion or protrusion is formed on the outer peripheral surface of the columnar connection protrusion 5a so that the connection is not easily removed. In addition, a small concave portion or groove may be formed on the inner peripheral surface of the circular hole-shaped connecting concave portion 5b, or the tip of the connecting convex portion 5a is thinned or a hemispherical dome shape is used for easy connection. May be.

  As already described with reference to FIG. 3, the filling member 10 for the groundwater tank having the above-described configuration is disposed in the horizontal direction (vertical and horizontal directions) and the vertical direction (vertical direction), and is installed inside the underground water tank. As shown in FIG. 4, the dovetail-shaped connecting projections 3 a of the horizontal connection connecting portions 3 are arranged horizontally adjacent to each other in the vertical and horizontal directions (horizontal direction). The horizontal plate portions 1 and 1 of the filling member 10 can be connected vertically and horizontally simply by fitting into the dovetail-shaped connecting recess 3b of the connecting portion 3 for connection.

  And it fits in the cylindrical connection convex part 4a for up-and-down connection, and the circular-hole-shaped connection recessed part 4b for the up-and-down connection of the filling member 10 arrange | positioned in the up-down direction, and the front-end | tip surface of the leg part 2 of FIG. The horizontal plate of the filling members 10 and 10 is simply fitted into the circular connection groove 5b for connecting the upper and lower columns and the cylindrical connecting convex portion 5a for connecting the upper and lower portions. The parts 1, 1 and the ends of the leg parts 2, 2 can be connected vertically.

  As described above, the filling member 10 for groundwater tank according to the present invention has the connecting convex portion 3a and the connecting convex portion 3a facing each other regardless of which side surface of the filling member 10 is in contact with any side surface of the filling member 10 adjacent thereto. Without this, the connecting convex portion 3a and the connecting concave portion 3b are fitted. Further, even if the filling member 10 is turned upside down without worrying about the directionality, the shapes of the horizontal plate portion 1 and the horizontal plate portion 1 are matched (the orientation of the horizontal plate portion 1 and the horizontal plate portion 1 in plan view). The connecting convex portion 4a and the connecting convex portion 4a or the connecting convex portion 5a and the connecting convex portion 5a do not face each other. Since the connection recessed part 5b fits, workability is very high.

  6 is a plan view showing a structural unit of a filling member for a groundwater tank according to another embodiment of the present invention, FIG. 7 is a partial perspective view of the filling member, and FIG. 8 is a filling member that is adjacent to the filling member in an oblique direction. It is a partial side view which shows a connection state with.

  The ground water tank filling member 11 has, on the side surfaces on both sides of the corner of the horizontal board 1, a connecting projection 6 a for oblique connection that also serves as a horizontal connection instead of the connecting projection 3 a for horizontal connection described above. It is formed. An opening 6b for oblique connection is formed on the upper surface of the horizontal platen 1 located just before the connection convex portion 6a for oblique connection and also for horizontal connection.

  As shown in FIG. 7, the connecting convex portion 6 a for horizontal connection and diagonal connection is formed by bending the above-mentioned horizontal connecting dovetail-shaped connecting convex portion 3 a in an L shape upward. Yes, the tip of the bent portion 60a protrudes above the horizontal platen 1. And the opening 6b for diagonal connection is formed in the shape of a square hole provided with the rectangular opening in which this bending part 60a fits.

  Similarly to the above-described filling member 10, the filling member 11 also has a connecting projection 6 a for horizontal connection that serves as an oblique connection, a connection recess 3 b for horizontal connection, and an opening 6 b for an oblique connection. When the rotation center O is rotated as a base point (360/4) ° = 90 °, it is formed at an overlapping position, and the connecting convex portion 6a and the connecting concave portion 3b formed in the upper right filling member constituent unit T are adjacent to each other. The connecting concave portion 3b and the connecting convex portion 6a formed in the adjacent upper left filling member constituent unit T are positioned in a line symmetrical position with respect to the boundary line L1 with the upper left filling member constituent unit T, and The lower right corner of the connecting convex portion 6a and the connecting concave portion 3b formed in the upper right filling member constituent unit T is in a line-symmetric position with respect to the boundary line L2 between the adjacent lower right filling member constituent unit T. Connection recess 3 formed in filling member structural unit T It is formed so that b and the connection convex part 6a may be located.

  Since the other structure of this filling member 11 is the same as that of the filling member 10 shown to FIGS. 1-4 mentioned above, the same code | symbol is attached | subjected to the same member and description is abbreviate | omitted.

  As shown in FIG. 3, the filling member 11 having the above-described configuration is arranged in the horizontal direction (vertical and horizontal directions) and the vertical direction (vertical direction). As shown in FIG. 8, the connecting protrusions are fitted in the connecting recesses 3 b for horizontal connection of the filling members 11 adjacent to each other in the direction. The bending portions 60a of 6a are fitted and engaged, and the adjacent filling members 11 are connected to each other in the horizontal direction and the oblique direction. And the connection convex part 4a for a vertical connection and the connection convex part 5a of the front end surface of the leg part 2 are overlapped with the up-down direction, the connection concave part 4b for the vertical connection of the filling member 11, and the front-end | tip of the leg part 2 The upper and lower filling members 11 are also connected to each other by fitting into the connecting recesses 5b on the surface. Accordingly, the groundwater tank filling member 11 is also constructed in a horizontal space and a vertical direction without worrying about the directionality of the filling member 11, and a strong void structure is built inside the groundwater tank with good workability. In addition, since the oblique filling members 11 are also connected to each other, a stronger void structure can be constructed.

  The groundwater tank filling members 10 and 11 according to the above embodiment each include the leg 2 protruding from the lower surface (one horizontal plane) of the horizontal board 1, but the horizontal board 1 without the legs. For example, a filling member comprising only a rectangular frame-shaped horizontal platen 1 having a certain height, and the above-mentioned ant tenon shape for horizontal connection is formed on the side surface of the horizontal frame-shaped horizontal platen 1. The column-shaped connecting projection 4a and the circular hole-shaped connecting recess 4b are formed on the upper and lower surfaces of the connecting projection 3a, the dovetail-shaped connecting recess 3b, and the rectangular frame-shaped horizontal board 1. May be.

Since the filling member made up of only the horizontal plate portion 1 without the leg portions has no vertical direction, the connecting convex portion 4a and the connecting concave portion 4b for connecting the upper and lower portions are both on the upper surface and the lower surface of the horizontal plate portion 1. It is good to form.
In addition, it is necessary to form a large number of water passage holes in the rectangular frame type horizontal board portion 1 of the filling member so that water can freely enter and exit. In addition, it is desirable that such a rectangular frame type horizontal platen 1 is divided and molded as appropriate in consideration of formability.

  Since such a filling member is also connected in the vertical and horizontal and vertical directions only by being disposed in the horizontal direction (vertical and horizontal directions) and the vertical direction, a strong void structure can be built in the groundwater tank with good workability. .

DESCRIPTION OF SYMBOLS 10,11 Filling member for groundwater tanks T Filling member structural unit O Center of rotation of filling member L1, L2 Boundary line between filling member structural unit and filling member structural unit 1 Horizontal plate part 1a Quadruple frame part 1b Lattice part 1c Closure part 2 Leg Part 3 Connection part for horizontal connection 3a Connection convex part 3b Connection concave part 4 Connection part for vertical connection 4a Connection convex part 4b Connection concave part 5 Connection part for vertical connection 5a Connection convex part 5b Connection concave part 6a Diagonal connection for horizontal connection Connecting projection 60a bent portion 6b opening for oblique connection

Claims (3)

A filling member that is arranged in a horizontal direction and a vertical direction to form a void structure inside the underground water tank,
Said filler member, co the side surfaces are arranged in the horizontal direction are combined, they are combined the tips of the legs projecting from the other horizontal surface of one of the horizontal plane and between the filling member of the Filling member, in the vertical direction In a plan view substantially regular n-gon (n is an integer of 3 or more),
The filling member constitutional unit provided with the connecting portion is configured by being arranged n (360 / n) ° apart from the rotation center of the filling member without gaps,
The connecting portion includes at least a pair of connecting convex portions and a connecting concave portion, and a boundary between all the connecting convex portions and the connecting concave portions formed in one filling member constituent unit and another adjacent filling member constituent unit. All connecting concave portions and connecting convex portions formed in adjacent adjacent filling member constituent units are located at line symmetrical positions with respect to the line ,
A filling member for a underground water tank , wherein at least a pair of connecting convex portions and a connecting concave portion are formed on a tip end surface of a leg portion formed for each filling member constituent unit . The filling member is provided with a plurality of legs protruding from one horizontal surface of the horizontal board part and the horizontal board part, and the leg parts are composed of at least one filling member constituting unit and all the filling member structures. One is formed at approximately the center of the filling member straddling the unit, and at least n pairs of connecting projections and connecting recesses are formed on the front end surface of the leg portion formed at the approximately center. The filling member for underground water tanks according to claim 1.   The filling member for underground water tanks according to claim 1, wherein n = 4.

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