JP2005220736A - Spacer for ventilation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase the earthquake resistance of anchor bolts by increasing construction efficiency by facilitating the insertion of raised parts into the anchor bolts by various ways and reducing a clearance between a continuous footing and a foundation in a spacer for ventilation used between the continuous footing and the foundation of a building to form the clearance for ventilation. <P>SOLUTION: This spacer 1 for ventilation comprises holes allowing the various types of anchor bolts raised from the continuous footing to be easily inserted through insert holes 2a, 2b, 2c, and 2d of normal, vertically inverted, and laterally inverted and enlarged type. Thus, since construction efficiency is increased and the height of the spacer 2 for ventilation is suppressed lower than the wire diameter of the M12 anchor bolt, the intensity of the earthquake resistance of the anchor bolts can be increased. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a ventilation spacer interposed between a fabric foundation such as a house and a base.

JP, 2004-3267, A is disclosed as a steel ventilation spacer. This disclosed steel ventilation spacer has a repetitive concave and convex shape with symmetrical upper and lower surfaces, the left and right end face flange portions are directed outward, and has a height of 9 mm to 15 mm. In addition, a plurality of reinforcing beads are provided at corners of the vertical surface portion and the horizontal surface portion with respect to the load resistance, and a plurality of insertion holes are provided for anchor bolt insertion.

Japanese Unexamined Patent Publication No. 2003-301532 is disclosed as a long resin-made basic packing. The disclosed long foundation packing has a length of 910 mm, a height (thickness) of 20 mm, a vent hole on the side surface, and a plurality of anchor bolt insertion holes each having a square shape on the flat surface. The lower surface is asymmetrical and should not be turned over.

Looking at the steel ventilation spacers disclosed in Japanese Patent Application Laid-Open No. 2004-3267, the horizontal flanges on the left and right end surfaces are made of stainless steel, the plate thickness is 1 mm, and the vertical columns have nine pillars with repeated irregularities. Since each is directed to the outside, when a load of 5 tons or more is applied, the flange portion begins to escape to the left and right, thereby lowering the height and reducing the load resistance. As countermeasures, reinforcing beads are provided at the corners of the vertical and horizontal planes so that they can withstand a load of 7 tons. However, reinforcing beads must be provided from the upper side and the lower side. There is a problem with the characteristics, and as a result, the price of the product itself becomes high.

In addition, a plurality of insertion holes are provided for anchor bolt insertion, but the area of the plurality of insertion holes is too large, so that indentation into the base occurs with respect to the surface pressure of the load. There is a problem that it falls.

Next, when looking at the long foundation packing according to Japanese Patent Application Laid-Open No. 2003-301532, the height (thickness) is 10 mm to 30 mm, and vent holes are provided on the side surfaces. In the 2003 edition of the “wooden housing construction common specification” published by the Housing Finance Promotion Association (hereinafter referred to as the “specification”), which is supervised by the Housing Finance Corporation, In the construction method that ventilates between the base and the foundation), it is stated that a ventilation area of 75 cm ² or more is required for 1 m over the entire circumference of the foundation. Based on this specification, the structure of the ventilation material in the cat base construction method Will naturally be restricted. In other words, even though “the height (thickness) is 10 mm to 30 mm and a vent hole is provided on the side surface”, in addition to the above-mentioned “ensuring a ventilation area of 75 cm ² or more for 1 m of the foundation” Satisfying "Ensuring loadability" is an "indispensable condition for the height structure of the packing", and in order to satisfy this condition, the height must be 20 mm. It has become. Therefore, the claim of 10 to 30 mm is based on the recognition that “the difference in the gap between the foundation and the foundation has a significant effect on the anchor bolt, which is the most important member for the earthquake resistance and safety of the house”. It's not just technology, it's just an extension of rights.

The height (thickness) of the ventilation packing by the “cat foundation method” is not limited to the above-mentioned Japanese Patent Application Laid-Open No. 2004-3267 and Japanese Patent Application Laid-Open No. 2003-301532. It is a technology from the viewpoint of ventilation (ventilation), and the description of “The anchor bolt embedding interval should be within 2.7 m for the base and within 2 m for 3 stories” The specifications are based on the premise that the foundation and the foundation are in close contact, and the difference in the gap (height) between the foundation and the foundation is the most important for the earthquake resistance and safety of the house. There was no recognition that it would have a significant impact on the anchor bolt, which is a member, "he said.

JP 2004-3267 A JP 2003-301532 A “Finished Wooden House Construction Common Specification” published by Housing Finance Promotion Association, 2003 edition

The present invention is used to interpose between a fabric foundation and a foundation of a building to form a gap for ventilation, has a width similar to that of the foundation, and a height dimension equal to or less than the wire diameter of the anchor bolt. The upper and lower surfaces are provided with a plurality of insertion holes for anchor bolt insertion, and the whole upper and lower surfaces are symmetrical quadrilateral spacers. A ventilation spacer is provided which is directed to

In the present invention, a plurality of insertion holes provided in a rectangular shape whose upper and lower surfaces are symmetrical are given a predetermined play to form a loose hole, and the insertion hole formed into a loose hole has a rectangular shape as a whole. In order to dispose the ventilation spacer symmetrical to the upper and lower planes at a predetermined position on the cloth foundation, the right and left are reversed or the upper and lower are reversed. Thus, a ventilation spacer is provided which has an insertion hole that can accommodate insertion of a misaligned anchor bolt.

The present invention is used to interpose between a fabric foundation and a foundation of a building to form a gap for ventilation, and has the same width as the foundation. A plurality of holes are provided, and a plurality of insertion holes for inserting anchor bolts are provided on the upper and lower surfaces, the height dimension is equal to or less than the wire diameter of the anchor bolts, and the overall upper and lower surfaces have a symmetrical rectangular shape. A plurality of insertion holes provided with predetermined play to form loose holes, the loose holes having a rectangular shape as a whole in the length direction and the width direction. Provided so as to be deviated with respect to each center line, when arranging the ventilation spacer symmetric to the upper and lower planes at a predetermined position of the fabric foundation, by arranging it in a regular or horizontally reversed or vertically reversed manner, Misalignment anchor bolt Providing ventilation spacers, characterized in that the insertion hole to the insertion can respond.

The present invention is used to interpose between a fabric foundation and a foundation of a building to form a gap for ventilation, has a width similar to that of the foundation, and a height dimension equal to or less than the wire diameter of the anchor bolt. The front / rear or front / rear / left / right side surfaces are provided with a plurality of ventilation through holes, and the overall top / bottom surface is a symmetrical quadrilateral shape. Only a hole diameter and the number of holes necessary for insertion are processed in the field, and a ventilation spacer is provided which can be interposed between the cloth foundation and the base.

According to the ventilation spacer 1 of the present invention, (1) an opening ratio of 85% and a sufficient ventilation area under the floor are ensured, and (2) an enlargement formed by overlapping the main body with normal, left-right reversal, top-bottom reversal Insertion holes [Fig. 3] 2A, 2B, 2C, and 2D make it easy to insert various anchor bolts that are raised at predetermined positions or shifted from each other. (4) It has a pressure strength of 20 times or more per building against the load of the building, and (5) It is lower than the wire diameter of the M12 anchor bolt against the pressure of earthquakes, typhoons, etc. By suppressing the height to 12 mm or less, the great effect that the earthquake resistance of the anchor bolt is increased by about 2.5 times compared to the conventional height of 20 mm, and in addition, (6) the mouse is suppressed by reducing the height to 12 mm or less. There is an effect that an intrusion prevention material becomes unnecessary.

Hereinafter, embodiments of the ventilation spacer of the present invention will be described. [FIG. 1] shows a plan view and a side view of the steel ventilation spacer of the present invention, [FIG. 2] shows a plan view and a side view of the resin ventilation spacer of the present invention, and [FIG. The enlarged insertion hole obtained by superimposing the outer shape of the spacer [FIG. 1] or [FIG. 2] and reversing normal, left / right, or upside down is indicated by a two-dot chain line, and FIG. 4 shows the anchor bolt insertion hole of the present invention. A plan view and a side view of a resin-made ventilation spacer not provided with a base are shown, and FIG. 5 shows a foundation 8 according to an embodiment of the present invention, an M12 anchor bolt 9 raised from the foundation, and a hole-down fixed to a through column 12 Fig. 6 shows a side view of the installation state of the M16 anchor bolt 10 raised from the foundation and the ventilation spacer 1 interposed in the gap between the foundation and the base 11, and Fig. 6 is a plan view of the installation state of the ventilation spacer 1 Fig. 7 shows anchor bolt bending due to gap differences. The graph of the deformation amount in the bending strength test and the shape photograph after the test are shown.

As shown in the perspective view, the ventilation spacer according to the embodiment of the present invention [FIG. 1] 1 is a deck plate in which the horizontal surface portion 4 and the vertical surface portion 6 are alternately arranged so that unevenness is continuously repeated as a whole. It is a quadrangular shape with the shape as the base and the horizontal flanges on both end faces facing inward. This deck plate shape as a whole has a symmetrical top and bottom surface, and therefore it can be used without any functional change even if the top and bottom surfaces are reversed. This is an important function for expanding the permissible range of the insertion hole through which various anchor bolts are passed, similar to the ventilation spacer [FIG. 2] 1 made of resin.

In this way, the overall size of the ventilation spacer 1 in the form of a steel deck plate that can be used without any change even if the upper and lower surfaces are symmetric, is 80 to 150 mm, length 80 to 200 mm, height 8 to 12 mm, plate thickness 1 to 2 mm. In this embodiment, the material is stainless steel, width 100 mm, length 164 mm, height 10 mm, plate thickness 1 mm, length The number of pillars on the surface is ten.

The ventilation spacer 1 used in the present invention is made of a steel plate, and is provided with insertion holes 2a, 2b, 2c, 2d for inserting various kinds of anchor bolts rising from the fabric foundation, and further for preventing slippage. A burring (cylindrical protrusion) 3 is provided. The insertion hole 2d may not necessarily be provided, and a plurality of reinforcing ribs may be provided at the corners of the horizontal surface portion and the vertical surface portion for reinforcing the load resistance.

In the ventilation spacer 1 used in the present invention, insertion holes 2a and 2b each having a length of about 40 mm and a width of about 25 mm through which various anchor bolts standing from the fabric foundation are inserted are left and right in the longitudinal direction, and 15 mm in length and width. An oval insertion hole 2d having a length of about 20 mm is provided so as to be deviated from the center line in the vertical direction and the horizontal direction, respectively. By forming the ventilation spacer body in regular, left-right and up-and-down directions, the enlarged insertion holes of about 60 mm in length x 42 mm in width [Fig. 3] are formed on the left and right sides. FIG. 3] 2c becomes an oblong enlarged insertion hole 2C having a length of 60 mm × width of 14 mm, and an oblong hole having a length of 30 mm × width of 20 mm. FIG. 3D becomes an enlarged insertion hole 2D. for Insertion is possible. In addition, the size of the said insertion hole, the number of holes, the number of pillars, etc. are not limited, It can change and use as needed.

According to the embodiment of the present invention, the ventilation spacer made of a resin material [FIG. 2] 1 has insertion holes 2a, 2b, 2c, and 2d for inserting various kinds of anchor bolts rising from the fabric foundation. In FIG. 1 a, the side surface of the flat block is provided with a plurality of ventilating cylindrical holes 7 in the vertical direction. These resin ventilation spacers [FIG. 2] 1 and 1a have symmetrical upper and lower surfaces, and can be used even if the upper and lower surfaces are reversed, like the ventilation spacer [FIG. 1] 1 made of steel. It has a function that can. The shape of the ventilation cylindrical hole may be any shape such as a circle, an ellipse, and a polygon, and the penetration direction may be provided not only in the vertical direction but also in the cross direction in addition to the horizontal direction.

Thus, the overall size of the resin ventilation spacer 1 according to the present invention is such that the upper and lower surfaces are symmetrical and can be used without any change even if the upper and lower surfaces are reversed. The width is about 150 mm, the length is about 80 to 200 mm, and the thickness is 8 to 12 mm. In this embodiment, the width is 102 mm, the length is 162 mm, the height (thickness) is 10 mm, and the hole diameter is 8 mm. The ventilation spacer 1 is provided with insertion holes 2a, 2b, 2c, and 2d through which various anchor bolts rising from the fabric foundation are passed. However, the insertion holes 2d that are not frequently used may not necessarily be provided.

Further, in the ventilation spacer [FIG. 4] 1 made of a resin material according to the embodiment of the present invention, the “insertion holes 2a, 2b, 2c, 2d” are not provided as in FIG. The reason for this is that when making the ventilation spacer 1 take advantage of the processing characteristics of the resin and making it “site-ready”, the ventilation spacer 1 preset on the foundation is made to penetrate the anchor bolt together with the foundation at the construction site. This is because it is possible to pierce the insertion hole at the site of construction, or to pierce only the ventilation spacer 1 at the construction site and then install it between the foundation and the foundation.

In addition, as a measure for preventing slipping due to an earthquake or the like in the ventilation spacer [FIG. 2] [FIG. 4] 1 in which the material according to the embodiment of the present invention is made of resin, a soft resin or a bond is applied to the whole upper surface or several places. Affixing or fixing the ventilation spacer to the foundation with a tucker or a nail, etc., and then applying a soft resin or bond on the upper surface (base side) to prevent slipping.

Next, in the embodiment of the present invention, the grounds for setting the height of the ventilation spacer 1 to 8 mm to 12 mm in [0016] [0020] for both steel and resin will be described. First, from the aspect of ventilation, a formula of 7500 mm ² ÷ 1000 mm = 7.5 mm is satisfied to satisfy the “specialization of a ventilation area of 75 cm ² or more in the range of 1 m of foundation” in the public sector specification. There are at least one inclusion having a compressive strength against the load per 1000 mm of the base, so that the height of the inclusion is 8 mm or more. Also, from the standpoint of the proof strength of the anchor bolt, the maximum diameter R of the wire diameter φ12 mm of the M12 anchor bolt that stands up from the top end of the fabric foundation can show bending resistance is 12 mmR, and a lower height is a preferable value. Become. Accordingly, the height of the ventilation spacer 1 is preferably 8 mm or more and 12 mm or less.

When the material for the ventilation spacer 1 as described above is made of steel, for example, it can be made into a product by single-type pressing or progressive pressing using a stainless steel plate, and the material is made of resin. In such a case, it can be molded by, for example, an injection molding machine or an extrusion molding machine.

In this way, the ventilation spacer 1 made of steel or resin is interposed between the fabric foundation 8 and the base 11 of the building as shown in FIG. As for the intervention position, there are certain conditions as described above. Specifically, the rising position of M12 anchor bolt 9 and M16 anchor bolt 10, the bottom of through column 12 and nut column 13, the base joint and base joint (not shown), etc. Although illustration is omitted, the ventilation spacer 1 is interposed at a constant interval, for example, an interval of about 50 cm, in the straight portion of the fabric foundation.

As described above, the ventilation spacer 1 according to the present embodiment installed between the fabric foundation 8 and the base 11 is a public corporation specification, in order to prevent rot and moisture under the floor. was in the range of securing a 75 cm ² or more vent area, the gap has provisions screen firmly attach it to "for Bonezumi, as invasion example of murine, a gap 25mm in the ceiling portion of the" Kyupikuru A mouse about 20cm in length, including the tail, invaded and then passed through the 15mm gap, causing an electrical accident. " “The 10 mm height can reliably prevent the intrusion of mice (the main intention)” (reference: “Super Rat” by Hiromi Kanamaru, Tokuma Shoten) Mm It can be said that the ventilation spacer 1 itself has a fouling function.

Hereinafter, calculation examples of the ventilation area when the earthquake-resistant spacer 1 for ventilation according to the present embodiment is installed are shown for steel and resin, respectively. First of all, the calculation example of the steel deck plate shaped ventilation spacer has an opening ratio of 85% on the ventilation surface. For example, when 2.5 pieces are installed in the base 1 m, the opening area in the installation part of the ventilation earthquake resistant spacer Is 164 mm × 10 mm × 2.5 pieces × 85% = 3485 mm ² . On the other hand, the opening area of the part where the ventilation spacer is not installed is [1000 mm− (164 mm × 2.5)] × 10 mm = 5900 mm ² . The sum of both is 9385 mm ² = 93.85 cm ² , which sufficiently satisfies the above definition.

Next, in the calculation example of the ventilation spacer 1 in the case where a φ8 circular ventilation hole is drilled in the cross direction on the resin side surface, the opening ratio of the ventilation surface is 49.6%. When 2.5 pieces are installed, the opening area in the installation portion of the ventilation spacer is 162 mm × 10 mm × 2.5 pieces × 49.6% = 2009 mm ² . On the other hand, the opening area of the part where the ventilation spacer is not installed is [1000 mm− (162 mm × 2.5)] × 10 mm = 5950 mm ² . The total of both is 7959 mm ² = 79.59 cm ^2, which also satisfies the specifications of the public corporation.

The insertion holes 2a, 2b, 2c and 2d in the ventilation spacer 1 are for passing the M12 anchor bolt 9 and M16 hole down anchor bolt 10 whose installation examples are shown in FIG. Enlarged insertion holes obtained when the ventilation spacers 1 are overlapped with each other in a normal, left-right reversal, and upside-down orientation are provided at asymmetric positions on the center lines in each direction. FIG. 3] Used as 2A, 2B, 2C, 2D. For example, when an M16 hole down anchor bolt standing at 31 mm from the side of the pillar is inserted through the enlarged insertion hole 2A, an M12 anchor bolt rising at 200 mm from the center of the pillar is simultaneously inserted into the enlarged insertion hole 2C. It has a function to be inserted. At this time, the permissible range of the expanded insertion hole 2A or 2B of the M16 hole down anchor bolt raised to 31 mm from the side of the through column is 15 mm to 40 mm in the longitudinal direction, and ± 22 mm from the center line of the foundation in the width direction. It is an acceptable range. Further, the allowable range of the M12 anchor bolt raised 200 mm from the center of the column is 182 mm to 211 mm. The distance between the M16 hole down anchor bolt raised to 31 mm from the side of the through pillar and the M12 anchor bolt raised to 200 mm from the center of the pillar is 200 mm− (column 120 mm ÷ 2 + 31 mm) = 109 mm. In this case, the allowable range for simultaneous insertion of the insertion hole 2a and the insertion hole 2b is 103 mm to 115 mm. However, the anchor bolts may be sandwiched by two ventilation spacers, not necessarily the simultaneous insertion.

Next, there is a problem of skidding due to an earthquake or the like which is a concern when the ventilation spacer 1 according to the embodiment of the present invention is interposed between the foundation and the foundation. As a countermeasure, the steel ventilation spacer 1 is provided with a plurality of anti-slip burrings (cylindrical protrusions) 3 having a height of about 1 mm and an inner diameter of about 3 mm above and below the horizontal surface 4 of the side view [FIG. 1] 1a. It is. This burring hole with an inner diameter of about 3 mm can also be used as a hole for nailing when it is fixed to the foundation or foundation.

When the steel ventilation spacer 1 according to the embodiment of the present invention is interposed between the foundation and the foundation, another concern is the problem of strength against the load received from the building. It is said that the load of a typical two-story wooden house with a floor area of 20 tsubo is about 50 tons, and when 120 steel ventilation spacers 1 are installed here, the load per piece is 50,000 Kg ÷ 120 pieces = 417 kg. It was confirmed by a pressure test at the Metropolitan Industrial Technology Research Institute that the compressive strength per piece of the steel ventilation spacer 1 was about 9.1 tons. That is, it can be said that the resistance of one steel ventilation spacer 1 is 9100 Kg / 417 Kg = 21.8 with respect to the load 417 Kg of the house, which is approximately 22 times the load and has a safe resistance. In order to obtain a higher load bearing capacity, the number of columns may be increased or reinforcing ribs may be provided at the corners of the vertical surface portion and the horizontal surface portion.

Next, there is a problem of strength with respect to the load received from the building, which is a concern when the resin-made ventilation spacer 1 according to the embodiment of the present invention is interposed between the foundation and the foundation. As shown in a sectional view [FIG. 2] 1a, the resin ventilation packing 1 has a circular tunnel. In the embodiment of the present invention, 16 holes of φ8 are formed at the center of 162 mm in length and 10 mm in thickness at intervals of 10 mm in this case. In this case, the thickness between the holes is 2 mm each. . At this time, the amount of deformation when a pressure of 10 tons is applied is only 0.5 mm, and a sufficient proof stress of about 24 times the load of 417 kg of house per ventilation spacer shown in [0031] is provided. I have.

Next, the strength (strength) of the M12 anchor bolt for fastening the base is increased by setting the height (thickness) of the ventilation spacer 1 made of steel or resin as the material according to the embodiment of the present invention to 10 mm. The fact that it works larger than 20 mm in height will be described in detail with reference to FIG.

In order to prevent under-floor rot and moisture, etc., it is necessary to leave a large gap between the foundation and the foundation. However, to maintain the strength (proof strength) of the M12 anchor bolt, the gap between the foundation and the foundation (height) is reversed. It is necessary to keep it low. Conventionally, it is generally known that a metal object such as an anchor bolt can be easily bent with an inner R dimension that is equal to or greater than a plate thickness (wire diameter) as a “bending characteristic”. For example, the wire diameter of an anchor bolt of a commonly used M12 rolling screw is φ10.7 mm, and the bending at this time is easy to bend when the inner radius is R10.7 mm or more. This means that the anchor bolt bending resistance (yield strength) is large when the height (gap) of the ventilation spacer 1 according to the embodiment of the present invention is 10 mm and the height (gap) of 20 mm that occupies most of the market. It has been empirically predicted that there is a difference.

Therefore, there is a difference in the bending of the anchor bolt between the height (gap) of 10 mm of the ventilation spacer 1 according to the embodiment of the present invention and the height (gap) of 20 mm used in 80% or more of the market. A bending strength test was conducted at the Tokyo Metropolitan Industrial Technology Research Institute on December 25, 2003, and numerically confirmed [Fig. 7] is a graph of the deformation amount of [1], and [Fig. 7] 2 confirmed the shape. It is the photograph after the bending test of the made M12 anchor bolt. Note that graph 1 and photograph 2 in FIG. 7 are combined and edited so that the data of the gap 10 mm and the gap 20 mm can be easily compared.

If you look at the photo of the bending test [Figure 7] 2, the difference is obvious. In this bending strength test, for the convenience of the testing machine, the middle of the M12 anchor bolt (SS400, φ10.7 × 450L) is fixed, and the two screws on the left and right are simultaneously pressed. You should read about half. And as can be seen from this graph [FIG. 7] 1, in the test with a gap of 20 mm, the deformation amount at 6 KN is 1.05 mm, the deformation amount at 10 KN is 1.5 mm, and the deformation amount is about 12 KN from the pressurization. The proof stress began to drop from 3.5 mm to 8 mm, and the proof strength of the anchor bolt reached its limit at 14 KN. After that, only the deformation amount increased from 10 to 11 to 12 mm. On the other hand, in the test with a gap of 10 mm, the deformation amount was finally 1.1 mm at a pressure of 20 KN, and the deformation amount reached 2 mm. The deformation amount was 5 mm even at 24 KN and 31 KN, and the proof stress was still maintained.

It is the top view and side view of the steel ventilation spacer by embodiment of this invention. It is the top view and side view of the resin-made ventilation spacer by embodiment of this invention. FIG. 3 is a plan view of four inversions of the front, right, left, and top of the ventilation spacer of FIG. 1. It is the top view and side view of the resin-made ventilation spacer by embodiment of this invention. FIG. 3 is a side view of an example of a state in which the ventilation spacer of FIGS. 1 and 2 is used. It is a top view of the example of the use state of the ventilation spacer of FIG. 1, FIG. It is a bending test explanation of an anchor bolt, a graph of a deformation, and a shape photograph.

Explanation of symbols

1 Ventilation spacer 2a Insertion hole a
2b Insertion hole b
2c insertion hole c
2d insertion hole d
3 Non-slip cylindrical projection (guide hole for nailing)
4 Horizontal surface portion 5 Horizontal end surface flange 6 Vertical surface portion 7 Venting cylindrical hole 8 Fabric foundation 9 M12 anchor bolt 10 M16 hole down anchor bolt 11 Base 12 Through column 13 Pillar column Sv Width direction center line Sh Length direction center line

Claims (4)

Used to form a gap for ventilation between the fabric foundation and the foundation of the building, has the same width as the foundation, the height dimension is less than the wire diameter of the anchor bolt, Is a ventilation spacer that has a plurality of insertion holes for anchor bolt insertion and has a symmetrical quadrilateral shape on the top and bottom as a whole. A ventilation spacer characterized by that. The ventilation spacer according to claim 1, wherein a plurality of insertion holes provided in a quadrangular shape whose upper and lower surfaces are symmetrical are given a predetermined play to form a loose hole, and the insertion hole formed into a loose hole Is provided so as to be deviated with respect to the respective center lines in the length direction and the width direction having a quadrangular shape as a whole, and when arranging the ventilation spacer symmetric with respect to the upper and lower planes at a predetermined position of the cloth foundation, A ventilation spacer characterized by forming an insertion hole that can also accommodate insertion of a misaligned anchor bolt by arranging it in a regular manner or by reversing left and right or upside down. Used to form a gap for ventilation between the fabric foundation and the foundation of the building, having the same width as the foundation, and a plurality of through holes for ventilation on the front, rear, front, rear, left and right sides The upper and lower surfaces are provided with a plurality of insertion holes for anchor bolt insertion, the height dimension is equal to or less than the wire diameter of the anchor bolt, and the overall upper and lower surfaces are formed in a quadrangular shape, and the material is synthetic resin. A plurality of insertion holes provided with predetermined play to form a loose hole, and the loose hole as a whole has a square shape in the length direction and the width direction. In disposing the spacer for air ventilation symmetrical to the upper and lower surfaces at a predetermined position of the fabric foundation, the anchor bolt is displaced by being disposed normally or horizontally reversed or vertically reversed. Also for insertion Ventilation spacers, characterized in that the response can be through holes. It is used to interpose between the fabric foundation and the foundation of the building to form a clearance for ventilation, has the same width as the foundation, and the height dimension is equal to or less than the wire diameter of the anchor bolt. A plurality of through holes for ventilation are provided on the left and right side surfaces, and the overall upper and lower surfaces are symmetrical quadrilaterals. The ventilation spacers are made of synthetic resin, and are necessary for inserting anchor bolts during on-site construction. A ventilation spacer characterized by being able to be inserted between the fabric foundation and the foundation by processing only a simple hole diameter and the number of holes.