JP6604764B2 - Foundation packing - Google Patents

Description

  The present invention relates to a short foundation packing disposed at an appropriate interval between a foundation and a base.

  In recent years, in the foundation structure of a house, it has become mainstream to ventilate the floor under the building by interposing a foundation packing between a fabric foundation and a base. Among the main foundation packings, as disclosed in Patent Document 1, a plurality of short foundations that form a vent hole between adjacent foundation packings by arranging a plurality of them on the foundation at a predetermined interval. There is. The foundation packing is provided with a through-hole penetrating in the vertical direction so that anchor bolts planted in the foundation can be inserted, and the foundation packing is fastened to the foundation together with the base and fixed.

Japanese Utility Model Publication No. 54-181721

  In such a short foundation packing, it is necessary to secure an area of the upper surface of the foundation packing that is in contact with the foundation to be equal to or larger than a predetermined area in order to prevent the foundation placed thereon. For this reason, the short basic packing increases the area of the upper surface by reducing the opening area of the through hole as much as possible. Thus, in the short basic packing, it is preferable to make the opening diameter of the through hole close to the diameter of the anchor bolt so as to make the area of the upper surface as large as possible.

  On the other hand, the anchor bolt is fixed to the formwork in advance when the foundation is formed, and then the concrete is poured, or before the poured concrete is hardened. Then, when the concrete is hardened to some extent, a self-leveling agent (hereinafter referred to as a leveler) for smooth top surface finishing is poured, and the anchorer is erected on the foundation by hardening the leveler. At this time, concrete and levelers ooze out and harden at the base portion of the anchor bolt, so that a bulge is formed at the base portion of the anchor bolt. Therefore, in the short foundation packing, the diameter of the through hole is enlarged to a certain size so that the bulge of the base part of the anchor bolt of the foundation does not hit the periphery of the through hole, and the foundation packing against the foundation It is necessary to suppress the date. As a result, the problem that the area of the upper surface of a foundation packing cannot be enlarged arises.

  Then, the objective of this invention is providing the foundation packing which can enlarge an upper surface, suppressing the rattling with respect to a foundation.

The foundation packing of the present invention is a short foundation packing arranged at an appropriate interval between a foundation and a base, and a top plate in which a through-hole penetrating in the vertical direction for passing an anchor bolt is formed. A top plate including a main body, and a rib for supporting the top plate on the foundation, the first rib formed so as to protrude vertically downward from the lower surface of the top plate main body so as to surround the through hole; And a groove formed on the top surface of the top plate body so as to surround the periphery of the through hole . And the said 1st rib is arrange | positioned apart from the outer periphery of the said through-hole, and the said groove | channel is arrange | positioned in the position which overlaps with the said 1st rib in an up-down direction .

  According to this, even if the opening area of the through hole of the top plate is reduced, the first rib is disposed away from the periphery of the through hole, so that the lower end of the first rib is separated from the root of the anchor bolt. It becomes possible. For this reason, it becomes difficult for the bulge of the anchor bolt base portion of the foundation and the first rib to come into contact with each other, it is possible to prevent the foundation packing from rattling against the foundation, and to increase the contact area with the foundation. The upper surface of the packing can be enlarged. Moreover, since the structure of the foundation packing is a structure in which the top plate is supported by the rib, the manufacturing raw material can be reduced, and the cost can be reduced.

  In this invention, it is preferable that the said 1st rib is formed so that the said through-hole may be surrounded over a perimeter. Thereby, the intensity | strength with respect to the load of the periphery of the through-hole of a top plate improves.

  In the present invention, the top plate body has a rectangular planar shape that is long in one direction, and protrudes downward from the outer peripheral end of the bottom surface of the top plate body so as to surround the first rib. A second rib formed is further provided. Then, the top plate has an overhang portion that projects outward from the second rib in the orthogonal direction orthogonal to the one direction from both side edges on the long side of the top plate body and extends in the one direction. It is preferable. Thereby, since a top plate has an overhang | projection part, it becomes possible to enlarge the upper surface of a foundation packing, and a contact area with a base becomes large. For example, even if a base packing for a base with a small width in the orthogonal direction is used for a base with a large width, the base is difficult to sink, and a base packing for a base with a small width is also used for a base with a large width. It becomes possible. For this reason, it becomes possible to use a foundation packing with respect to the foundation of multiple types of width. As a result, waste of the basic packing can be suppressed. In addition, it is possible to reduce the molds and production lines for manufacturing the basic packing, and it is possible to reduce the manufacturing cost of the basic packing.

In the present invention, it further includes an auxiliary rib protruding downward from the lower surface of the overhanging portion and connected to the second rib, and the lower end of the auxiliary rib is higher than the lower end of the second rib. It is preferable to be located at. Thereby, the intensity | strength with respect to the load of an overhang | projection part improves. Moreover, it becomes difficult for the lower end of an auxiliary rib to contact a foundation, and it can suppress further that a foundation packing rattles with respect to a foundation.
In the present invention, the top plate body has a rectangular planar shape that is long in one direction, and extends from one end edge in the one direction along the one direction on the top surface of the top plate body. It is preferable that another groove connected to the groove is formed. Thereby, ventilation | gas_flowing between a base and a foundation packing when a foundation is mounted on a foundation packing with a groove | channel different from a groove | channel can be ensured.

  According to the basic packing of the present invention, even if the opening area of the through hole of the top plate is reduced, the first rib is arranged away from the peripheral edge of the through hole. It can be separated from the root. For this reason, it becomes difficult for the bulge of the anchor bolt base portion of the foundation and the first rib to come into contact with each other, it is possible to prevent the foundation packing from rattling against the foundation, and to increase the contact area with the foundation. The upper surface of the packing can be enlarged. Moreover, since the structure of the foundation packing is a structure in which the top plate is supported by the rib, the manufacturing raw material can be reduced, and the cost can be reduced.

The condition where the foundation packing which concerns on one Embodiment of this invention was installed between the foundation and the base is shown, (a) is a side view, (b) is II shown to Fig.1 (a). It is sectional drawing along a line. It is a perspective view of the foundation packing shown in FIG. It is a top view of the foundation packing shown in FIG. It is a perspective view when the foundation packing shown in FIG. 1 is seen from the downward direction. It is a bottom view of the foundation packing shown in FIG. (A) is sectional drawing along VIa-VIa shown in FIG. 3, (b) is sectional drawing along VIb-VIb shown in FIG.3 (b).

  Hereinafter, the basic packing which is one Embodiment of this invention is demonstrated below, referring FIGS.

  As shown in FIG. 1, the foundation packing 1 in the present embodiment is a short one disposed at an appropriate interval between a building foundation 2 (for example, a cloth foundation) and a base 3. Ventilation holes 4 are formed between adjacent foundation packings 1. The foundation packing 1 in the present embodiment has, for example, a thickness in the vertical direction A of 20 mm, a length in the longitudinal direction B (one direction) parallel to the extending direction of the base 3 is 214 mm, and a width direction C perpendicular to the longitudinal direction B. Is 105 mm in length. The base packing 1 has a top plate 10 and ribs 30 and is made of synthetic resin. A through hole 13 is formed in the top plate 10 so as to penetrate in the vertical direction A (see FIG. 2). The foundation packing 1 is disposed on the foundation 2 so that the anchor bolts 5 implanted in the foundation 2 are passed through the through holes 13 and the lower ends of the ribs 30 are in contact with the foundation 2. A through hole (not shown) for the anchor bolt 5 is formed in the base 3, and the base 3 is disposed on the plurality of foundation packings 1 through the anchor bolt 5 in the through hole. Thereafter, the square washer 6 and the nut 7 are attached to the anchor bolt 5, whereby the base 3 is fixed to the foundation 2 with the foundation packing 1 interposed therebetween.

  As shown in FIG. 1, the top surface 10 a of the base packing 1 is in contact with the base 3. The top plate 10 has a rectangular planar shape that is long in the longitudinal direction B, as shown in FIGS. The top plate 10 has a top plate main body 10a and a protruding portion 10b. The top plate body 10a is a plate-like member having a rectangular planar shape elongated in the longitudinal direction B. For example, the length in the longitudinal direction B is 214 mm, the length in the width direction C is 97 mm, and the thickness in the vertical direction A is 3 mm. In addition, two through holes 13 are formed in the top plate body 10a. These through holes 13 are spaced apart from each other in the longitudinal direction B. More specifically, the two through holes 13 are arranged with a center line L1 (see FIG. 3) along the width direction C passing through the center in the longitudinal direction B of the top plate 10 (top plate body 10a). . Moreover, each through-hole 13 is formed in the substantially T shape as shown in FIG.

  On the top surface 11 of the top plate main body 10a, four grooves 11a extending in the longitudinal direction B and two annular grooves 11b surrounding the periphery of the through hole 13 over the entire circumference are formed. The four grooves 11 a are formed over the entire length in the longitudinal direction B of the top plate 10. The two inner grooves 11a among the four grooves 11a are partially connected to the two grooves 11b. By these grooves 11a and 11b, ventilation between the base 3 and the base packing 1 when the base 3 is placed on the base packing 10 is ensured.

  As shown in FIGS. 3, 5, and 6, the top plate body 10 a is formed with a thin portion 14 having a smaller thickness in the vertical direction A than other portions. As shown in FIG. 3, a groove 14a extending along the center line L1 is formed on the top surface 11 of the top plate body 10a. More specifically, the groove 14a extends in the width direction C from the inner two grooves 11a of the four grooves 11a to the outer end of the top plate body 10a. As shown in FIG. 5, the top plate body 10 a is formed with a groove 14 b extending along the center line L <b> 1 on the lower surface 12. More specifically, the groove 14 b extends across the entire width between the long side portions 32 a extending along the longitudinal direction B of the second rib 32. Such a groove | channel 14a, 14b is formed in the top-plate main body 10a, and the thin part 14 is comprised by reducing the thickness of the top-plate main body 10a. The thin portion 14 is formed over the entire width in the width direction C of the top plate body 10a.

  As shown in FIG. 4, the ribs 30 are formed so as to protrude vertically downward from the lower surface 12 of the top plate body 10a. As shown in FIG. 5, the rib 30 includes two first ribs 31, second ribs 32, and connecting ribs 33. The two first ribs 31 are formed in an annular shape so as to surround each of the through holes 13 over the entire circumference. Further, each first rib 31 is formed on the lower surface 12 so as to protrude vertically downward from a position slightly away from the peripheral edge of the corresponding through hole 13.

  As shown in FIGS. 4 and 5, the second rib 32 is formed to protrude vertically downward from the outer peripheral end portion of the lower surface 12 of the top plate body 10 a. That is, the second rib 32 is formed in an annular shape so as to surround the two first ribs 31 over the entire circumference. The second rib 32 has the same length as the first rib 31 in the protruding length from the lower surface 12, that is, the length in the vertical direction A. The thickness in the width direction C of the center of the long side portion 32 a of the second rib 32, that is, the portion 32 a 1 crossing the thin portion 14 is smaller than other portions. The long side portion 32 a is formed so as to bypass four cutout portions 16 described later formed in the top plate 10.

  As shown in FIGS. 4 and 5, the connecting rib 33 includes a plurality of first connecting ribs 33 a, a plurality of second connecting ribs 33 b, a plurality of third connecting ribs 33 c, and a plurality of fourth connecting ribs 33 d. Have The first connecting rib 33 a and the second connecting rib 33 b have the same protruding length as the second rib 32 from the lower surface 12. The third connecting rib 33 c and the fourth connecting rib 33 d have a protruding length from the lower surface 12 smaller than that of the second rib 32. That is, when the foundation packing 1 is placed on the foundation 2, the first rib 31, the second rib 32, the first connecting rib 33 a and the second connecting rib 33 b come into contact with the foundation 2 to support the top plate 10. The lower ends of the third connecting rib 33c and the fourth connecting rib 33d are disposed at positions spaced upward from the foundation 2. The first connecting rib 33a and the third connecting rib 33c are formed to extend along the width direction C. The second connecting rib 33b and the fourth connecting rib 33d are formed to extend along the longitudinal direction B. These first to fourth connecting ribs 33 a to 33 d are connected to one of the two first ribs 31 and the second rib 32.

  The lower surface 12 of the top plate main body 10a is surrounded by a plurality of first connection ribs 33a and a plurality of second connection ribs 33b among the two first ribs 31, the second ribs 32, and the connection ribs 33. A plurality of partitioned areas 34 are configured. The plurality of partition regions 34 are disposed on the entire lower surface 12 and are disposed with the thin portion 14 interposed therebetween in the longitudinal direction B. The plurality of partition regions 34 include eight first partition regions 34a, four second partition regions 34b, four third partition regions 34c, and a fourth partition region 34d. The 1st division area 34a is arrange | positioned at the four corners of each lower surface 12 when the top-plate main body 10a is divided into 2 by the centerline L1. The second partitioned areas 34b are arranged between the first partitioned areas 34a with respect to the longitudinal direction B, respectively. The four third partition regions 34c are arranged inward of the second partition region 34b in the width direction C. The fourth partition region 34 d faces the center in the longitudinal direction B of the lower surface 12 of the top plate body 10 a and extends along the width direction C. The space in the fourth partition region 34d faces the thin portion 14 in the vertical direction A.

  The rib 30 is formed with a plurality of communicating portions 35 for communicating the plurality of partition regions 34 with the outside when the foundation packing 1 is disposed on the foundation 2. The communication portion 35 has a concave shape that opens downward, and is formed so as to penetrate in the longitudinal direction B (thickness direction). In more detail, the communication part 35 is formed in each of the 1st connection rib 33a. In addition, two communication portions 35 are formed in the first connection rib 33 a that is sandwiched between the two through holes 13 and connected to one first rib 31 among the plurality of first connection ribs 33 a. In addition, four communication portions 35 are formed on both short side portions 32b that extend along the width direction C at both ends in the longitudinal direction B of the second rib 32, and the short side portions 32b Adjacent partition regions 34a and 34c are communicated with the outside. The plurality of communication portions 35 are arranged so that all the partition regions 34 communicate with each other. A plurality of partition regions 34 communicate with the outside from both side edges in the longitudinal direction B of the second rib 32. The plurality of partition regions 34 a and 34 c communicate with the fourth partition region 34 d (space facing the thin portion 14) via the plurality of communication portions 35.

  The overhang | projection part 10b of the top plate 10 is comprised by the eight overhang | projection parts 10b1, as shown in FIGS. The overhanging portions 10b1 are formed so as to protrude four from the both side edges on the long side of the top plate body 10a outward in the width direction C. Therefore, the upper surface 10b2 of each projecting portion 10b1 is at the same height level as the upper surface 11 of the top plate body 10a, and the lower surface 10b3 of each projecting portion 10b1 is at the same height level as the lower surface 12 of the top plate body 10a. These overhanging portions 10b1 are spaced apart from each other in the longitudinal direction B at each edge on the long side of the top plate body 10a. Moreover, these overhang | projection parts 10b1 are arrange | positioned with line symmetry with respect to the centerline L1. Each overhanging portion 10 b 1 is disposed outside the second rib 32 in the width direction C and extends along the longitudinal direction B.

  As shown in FIGS. 2 and 6B, three auxiliary ribs 36 that protrude downward from the lower surface 10b3 and whose side surfaces are connected to the second rib 32 are formed on the lower surface 10b3 of each overhanging portion 10b1. ing. These three auxiliary ribs 36 are disposed at both ends and the center in the longitudinal direction B of the overhanging portion 10b1. By forming the auxiliary ribs 36 in this way, the strength against the load applied to the overhanging portion 10b from above is improved. The protruding length of the auxiliary rib 36 from the lower surface 10b3 is smaller than that of the second rib, as shown in FIG. 6 (b). That is, the lower end of the auxiliary rib 36 is located above the lower end of the second rib 32. For this reason, as shown in FIG. 1B, when the foundation packing 1 is placed on the foundation 2, the lower end of the auxiliary rib 36 is disposed at a position spaced upward from the foundation 2. The foundation 2 is formed, for example, by curing concrete filled between the molds. When the foundation 2 is formed, the upper surface portion of the corners of the foundation 2 shown in FIG. May be formed in a raised state. Thus, even if the upper surface portion of the corner portion of the foundation 2 is raised, it is difficult for the lower end of the auxiliary rib 36 to contact the foundation 2, so that the foundation packing 1 can be prevented from rattling against the foundation 2.

  As shown in FIG. 3, four notches 16 are formed at both end portions on the long side of the top plate 10. Two notches 16 are formed at each end on the long side of the top plate 10. These notches 16 are arranged symmetrically with respect to the center line L2 along the longitudinal direction B passing through the center of the top plate 10 in the width direction C. Further, the two cutout portions 16 formed at the respective end portions on the long side of the top plate 10 are spaced apart from each other along the longitudinal direction B. Each notch portion 16 is an end portion on both sides of the long side of the top plate body 10a, and in the longitudinal direction B, the overhanging portion 10b1 on the outside and the overhanging portion 10b1 on the inner side adjacent to the overhanging portion 10b1. Are cut out so as to penetrate the corresponding part in the vertical direction A. By forming the cutout portion 16 in this way, it is possible to visually recognize the relief ink drawn on the foundation 2 when the foundation packing 1 is installed on the foundation 2, and the foundation packing 1 with respect to the foundation 2. Can be easily aligned.

  As shown in FIG. 3, two notches 17 are formed at both end portions on the long side of the top plate 10. One notch 17 is formed at each end on the long side of the top plate 10. These two cutout portions 17 are arranged at the center in the longitudinal direction B of the top plate 10 so as to sandwich the thin portion 14 in the width direction C. Each notch portion 17 is an end portion on both sides of the long side of the top plate main body 10a, and in the longitudinal direction B, a portion corresponding to the space between two adjacent projecting portions 10b1 is formed in the vertical direction A. Notched so as to penetrate through.

  As described above, according to the basic packing 1 of the present embodiment, the first ribs 31 are spaced apart from the periphery of the through hole 13 to the outside. Thereby, even if the opening area of the through hole 13 of the top plate 10 is reduced, the first rib 31 is arranged away from the peripheral edge of the through hole 13, so that the lower end of the first rib 31 is connected to the anchor bolt 5. It is possible to separate from the base of the. For this reason, the swelling of the base portion of the anchor bolt 5 of the foundation 2 and the first rib 31 become difficult to contact, and it is possible to suppress the foundation packing 1 from rattling against the foundation 2 and to contact the base 3. The upper surface of the foundation packing 1 can be enlarged so that the area is increased. Moreover, since the structure of the foundation packing 1 is the structure which supports the top plate 10 with the rib 30, the manufacturing raw material can be reduced and cost reduction can be aimed at.

  Moreover, the 1st rib 31 is formed so that the through-hole 13 may be surrounded over a perimeter. Thereby, the intensity | strength with respect to the load which applies to the periphery of the through-hole 13 of the top plate 10 from upper direction improves.

  For example, there are a plurality of types such as 105 mm and 120 mm as the base width of the shaft assembly method. For this reason, a plurality of types of foundation packings corresponding to each of the foundation widths are manufactured, and the foundation packings corresponding to the respective foundation widths are used. Thus, since the foundation packing corresponding to each foundation width was required, home builders, such as a construction shop, need to have a plurality of types of foundation packing corresponding to each foundation width in stock. In this case, inventory management is troublesome, and when only some of the basic packings are used, it is necessary to hold the inventory of other types of basic packings for a long time. When stock of a specific type of basic packing is held for a long time, it may be necessary to dispose of it depending on the situation. Thus, if the foundation packing corresponding to each foundation width is required, management cost will become high or it will be very wasteful. However, in the base packing 1 of this embodiment, since the top plate 10 has the overhanging portion 10b, the upper surface 1a of the base packing 1 can be made larger than the base packing having a top plate made of only the top plate body 10a. It becomes possible, and a contact area with the base 3 becomes large. As shown in FIG. 1B, for example, even if the base packing 1 for the base 3 having a small width in the width direction C is used for a base having a large width (a base indicated by a two-dot chain line in the figure), It becomes difficult for the base packing 1 to sink into the base 9, and the base packing 1 for the base 3 having a small width can be used also for the base 9 having a large width. For this reason, it becomes possible to use the foundation packing 1 with respect to the bases 3 and 9 of two types of width. As a result, it is possible to suppress the waste of the foundation packing caused by holding the foundation packing dedicated to each of the bases 3 and 9. In addition, it is possible to further reduce the molds and production lines for manufacturing the basic packing 1, and to reduce the manufacturing cost of the basic packing 1.

  By forming the thin portion 14 on the top plate 10, the basic packing 1 can be easily divided into two by the thin portion 14, and a basic packing having a short length in the longitudinal direction B can be easily created. Become. For this reason, even when multiple types of lengths in the longitudinal direction B of the foundation packing 1 are required, by dividing the foundation packing 1 into two parts, a foundation packing having a shorter length in the longitudinal direction B than the foundation packing 1 before the division is obtained. Can be prepared. Accordingly, it is possible to prepare two types of foundation packings having a length in the longitudinal direction B from one type of foundation packing 1. As a result, the waste of the basic packing 1 can be further suppressed. In addition, it is possible to further reduce the molds and production lines for manufacturing the basic packing 1, and to reduce the manufacturing cost of the basic packing 1.

  Moreover, the thickness of the part 32a1 which crosses the thin part 14 of the 2nd rib 32 is smaller than another site | part. Thereby, the basic packing 1 can be more easily divided into two at the thin portion 14.

  In addition, two notches 17 are formed in the top plate 10. Thereby, the basic packing 1 can be more easily divided into two at the thin portion 14.

  The rib 30 is formed with a plurality of communicating portions 35 for communicating the plurality of partition regions 34 with the outside when the foundation packing 1 is disposed on the foundation 2. As a result, the plurality of partitioned areas 34 formed on the lower surface 12 of the top plate body 10a can communicate with the outside, and moisture can be released from the plurality of partitioned areas 34.

  The plurality of communication portions 35 are formed such that the plurality of partition regions 34 communicate with the outside from both side edges in the longitudinal direction B of the second rib 32. Thereby, for example, as shown in FIG. 1 (b), when the finishing mortar 2 a is applied to the outer side surface of the foundation 2 arranged along the longitudinal direction B, the outer side surface of the foundation packing 1 is applied. Even when the finishing mortar 2a is adhered, the communication portion 35 is not blocked by the finishing mortar 2a, so that moisture can be released from the plurality of partition regions 34.

  The communication portion 35 has a concave shape that opens downward. Thereby, when manufacturing the basic packing 1 by mold | die with a metal mold | die, it can manufacture with the metal mold | die divided into 2 parts up and down, and a manufacturing facility becomes simple.

  Further, as shown in FIG. 5, the plurality of communication portions 35 are configured such that the plurality of partition regions 34 a and 34 c communicate with the fourth partition region 34 d (space facing the thin portion 14) via the plurality of communication portions 35. Is arranged. Thereby, even if it is a case where what divided | segmented the basic packing 1 into the thin part 14 and arrange | positioned on a foundation, each division area | region 34a, 34c and the exterior communicate, and air permeability can be ensured.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are described in the claims. The first ribs 31 of the foundation packing 1 in the above-described embodiment are formed continuously (annular) so as to surround the through hole 13 over the entire circumference, but are formed intermittently so as to surround the through hole 13. May be.

  Moreover, although the two through-holes 13 were formed, only one may be formed. Further, the planar shape of the through hole 13 may be any shape as long as the anchor bolt 5 can be passed therethrough. Further, the rib 30 may be composed of only the first rib 31. Further, the auxiliary rib 36 may not be formed. Further, the lower end of the auxiliary rib 36 may be in the same position as the lower end of the second rib 32 in the vertical direction A.

  The top plate 10 may not have the overhanging portion 10b. That is, the top plate 10 may be composed of only the top plate body 10a. Moreover, the overhang | projection part 10b may be comprised by the overhang | projection part which protruded 1 to 3 or 5 or more outside in the width direction C from each of the both-sides edge of the long side of the top-plate main body 10a. In short, when the foundation packing 1 is used for the bases 3 and 9 having at least two types of widths, the overhanging portion 10b has a smaller amount of indentation into the foundation packing 1 than the predetermined amount. Thus, what is necessary is just to set so that the contact area (upper surface 1a) of the foundation packing 1 can be ensured.

DESCRIPTION OF SYMBOLS 1 Base packing 2 Base 3,9 Base 5 Anchor bolt 10 Top plate 10a Top plate main body 10b Overhang | projection part 13 Through-hole 14 Thin part 16 Notch part 17 Notch part 30 Rib 31 1st rib 32 2nd rib 32a1 part 36 Auxiliary rib

Claims (5)

A short foundation packing arranged at an appropriate interval between the foundation and the foundation,
A top plate including a top plate body in which a through-hole penetrating in the vertical direction for passing an anchor bolt is formed;
A rib for supporting the top plate on the foundation, the first rib formed to protrude vertically downward from the lower surface of the top plate body so as to surround the through hole ;
A groove formed on the top surface of the top plate body so as to surround the periphery of the through hole ;
The first rib is spaced apart from the periphery of the through hole , and
The basic packing , wherein the groove is disposed at a position overlapping the first rib in the vertical direction .   The basic packing according to claim 1, wherein the first rib is formed so as to surround the through hole over the entire circumference. The top plate body has a rectangular planar shape elongated in one direction,
A second rib formed to protrude downward from an outer peripheral end of the lower surface of the top plate body so as to surround the first rib;
The top plate has a projecting portion that projects outward from the second rib in the orthogonal direction perpendicular to the one direction from both side edges on the long side of the top plate body and extends in the one direction. The basic packing according to claim 1 or 2, characterized by the above. An auxiliary rib that protrudes downward from the lower surface of the overhang and is connected to the second rib;
The base packing according to claim 3, wherein a lower end of the auxiliary rib is positioned above a lower end of the second rib. The top plate body has a rectangular planar shape elongated in one direction,
The upper surface of the top plate main body is formed with another groove extending from the one end edge in the one direction along the one direction and connected to the groove. The basic packing according to item 1.

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