JP2010241717A - Underfloor structure and termite-proofing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that conventional methods comprising filling up a gap around piping piercing through concrete with a sealing material are liable to be influenced by skill of an operator and have a risk that they leave a part undone and to provide a termite-proofing sheet capable of precisely preventing invasion of termite. <P>SOLUTION: The termite-proofing sheet 10 is obtained by forming a composition comprising a regenerated butyl rubber and, incorporated therewith, boric acid and/or a boric acid compound into a sheet. The working method is simple one where the termite-proofing sheet 10 is wound around piping 62. The termite-proofing sheet 10 is reactively adhered to underfloor concrete 61 to leave no gaps. When the piping 62 or the underfloor concrete 61 displace, the termite-proofing sheet 10 follows the displacement to be distorted thereby hardly leaving gaps. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an underfloor structure and a method for preventing termites that prevent termites from entering. Specifically, the present invention prevents termites from entering through a gap in a pipe that penetrates underfloor concrete.

  Fabric foundation methods, solid foundation methods, etc. are known for under-floor construction of buildings. In the fabric foundation method, an inverted T-shaped fabric foundation is formed along the outer periphery of the building, and moisture-proof concrete is placed inside the fabric foundation. In the solid foundation method, the foundation is formed as an integral reinforced concrete structure made of concrete and cloth foundation placed on the entire ground below the building.

  As a main part of the termite entry path, there is a gap due to secular change or the like that occurs in the connecting part between concrete. In this regard, the solid foundation method differs from the cloth foundation method in that it is made of a single piece of concrete, making it difficult for termites to enter.

  Nonetheless, in any construction method, it is necessary to lead various pipes such as water and sewage from the outside to the indoor. In some cases, a gap is generated at a location penetrating through the above.

  As a method of arranging the pipe, it is common to place the pipe at a predetermined position before placing the underfloor concrete, and then place and harden the underfloor concrete. It is difficult to form a gap between the pipes. However, even with this method, the concrete shrinks as it hardens, creating a gap at the interface with the pipe, or even if the concrete can be placed without a gap. There may be a gap at the interface. There is a possibility that the gap generated in this way becomes an entry path for termites.

  Therefore, conventionally, it has been proposed to fill the gaps around the pipes with a room temperature curable sealing material containing an ant-proofing agent (see, for example, Patent Document 1). FIG. 8 is a sectional view showing this prior art. As shown in the figure, the gap around the pipe 62 penetrating the underfloor concrete 61 is closed by a sealing material 63. In this way, the termite entry path is blocked, and due to the effect of the termite-preventing agent in the sealing material 63, the termites avoid the periphery of the pipe 62, thereby preventing entry into the room.

JP 2001-247850 A

  Although it is possible to prevent the entry of termites by filling the gap with the sealing material as described above, the construction of this sealing material is easily influenced by the skill of the operator, and depending on the operator, it may cause the gap to remain unfilled There is. For this reason, there is a problem that termites enter from gaps left unfilled.

  The present invention has been made paying attention to the problems as described above, and its purpose is to provide an underfloor structure and a construction method capable of preventing termites from entering accurately regardless of the skill of the operator. There is to do.

  The underfloor structure according to the present invention is an underfloor structure in which an ant is prevented between the underfloor concrete and a pipe penetrating the underfloor concrete, and is obtained by containing an ant-repellent agent in an elastic body for concrete waterproofing. An adhesive and plastically deformable sheet-like material (hereinafter sometimes referred to as an ant-proof sheet) is disposed on a contact surface of the pipe with the underfloor concrete.

  Moreover, the ant-proof method according to the present invention is an ant-proof method between underfloor concrete and a pipe penetrating the underfloor concrete, and is obtained by adding an ant-proof agent to an elastic body for concrete waterstop. And a plastically deformable sheet-like material (for example, a chewing gum-like sheet-like material having plastic deformability that is sufficiently chewed and sticky. An ant-proof sheet) is disposed on the surface of the pipe in contact with the underfloor concrete, Next, the underfloor concrete is cast.

  In the method of embedding with a sealing material as in the above prior art, it is necessary to work carefully because it tends to cause unfilling and unevenness, but in the present invention, a sheet-shaped anti-rust sheet is wound around the pipe. Simple work such as, etc. is sufficient, it is not affected by the skill of the operator, it can be easily constructed without leaving a gap. In addition, since the above-mentioned ant-proof sheet can be produced in a factory with a constant thickness and width, the underfloor structure using this can exhibit a uniform and good ant-proofing property.

  If the location of the piping that penetrates the concrete is known in advance, the above-mentioned piping may be covered with a ant-proof sheet by a machine in a factory or the like, and this may be installed at the construction site. Thereby, the covering operation of the field worker can be omitted and the covering state can be made uniform and reliable. In the conventional method of filling a gap with a sealing material, an operator must perform a sealing material application operation at a construction site, but in the present invention, it is possible to prepare by a machine in a factory or the like as described above, Contribute to the provision of more stable and high-quality under-floor structures.

  The “arrangement on the contact surface” means that the arrangement is all over the circumferential direction of the pipe. If there is a part where the termite-proof sheet is not arranged in a part of the circumferential direction of the pipe, this may become a termite entry path.

  Examples of the concrete waterproofing elastic body in the ant-proof sheet include those using butyl recycled rubber as the main polymer, and those obtained by adding natural rubber or rubber as appropriate. A reinforcing agent, a filler, a plasticizer, a softening agent, an anti-aging agent, a tackifier, a processing aid, a colorant, a cross-linking agent, a cross-linking aid and the like may be appropriately blended in such a polymer, and mixed and dispersed. good. Such a composition may be used alone, or two or more kinds may be mixed and / or laminated.

  These concrete water-stopping elastic bodies (those having butyl recycled rubber as the main polymer) have the property of adhering to concrete as the concrete hardens in contact with ready-mixed concrete. Therefore, when the ant-proof sheet | seat which uses such an elastic body for a concrete water stop as a base is arrange | positioned on the piping surface and concrete placement is carried out, a clearance gap does not arise between piping and concrete.

  In addition, since the concrete waterproofing elastic body has stretchability, for example, even if displacement such as sedimentation / lifting occurs in the underfloor concrete or piping due to secular change, there is a risk that it deforms following this and creates voids. small.

  An adhesive and plastically deformable sheet-like material mainly composed of butyl recycled rubber is soft and easy to press against the pipe, and exhibits adhesiveness, so that it is easy to adhere to the pipe when it is covered. The above “mainly” means that butyl recycled rubber is 50% by mass or more with respect to all rubber components.

  As the termite-preventing agent contained in the termite-preventing sheet, an inorganic termite-preventing agent, particularly boric acid and / or a boric acid compound is preferable. Examples of the boric acid compound include copper borate, zinc borate, and borax.

  As described above, the termite-proof sheet used for the underfloor structure is sandwiched and integrated with the cast concrete and has long-term durability. Therefore, there is a long-term continuity of the ant-proof effect. Furthermore, since the duration of the ant-proofing effect is longer than that of the organic ant-proofing agent, the inorganic ant-proofing agent is useful for the ant-proofing sheet. Of the inorganic ant protection agents, boric acid and boric acid compounds have a high ant protection effect.

  It is preferable that the content of the ant preventive agent in the ant preventive sheet is 0.5 to 5% by mass. This is because if it is less than 0.5% by mass, the anti-ant effect is low. On the other hand, when the content exceeds 5% by mass, the ant-proof effect is saturated, and when it is excessively contained, the ant-proof sheet becomes soft and the handleability is deteriorated.

  In addition, when boric acid or a boric acid compound is included in the elastic body for concrete still water, an excellent ant-proof effect is exhibited even at a low concentration of 3 to 5% by mass, and even 0.5% by mass is good. It has been confirmed by experiments that it exhibits a good anti-ant effect.

  The thickness of the ant-proof sheet is preferably 2 mm or more. When the thickness of the ant-proof sheet between the pipe and concrete is 2 mm or more, the ant-proof sheet follows the displacement well when a displacement such as a rise or sink occurs in the pipe or concrete due to vibration of the building. This is because it is difficult to cause breakage or the like due to deformation, and the possibility of forming a gap is small. More preferably, it is 3 mm or more.

  A part (only part of the thickness of the underfloor concrete) of the contact surface with the underfloor concrete in the pipe may be covered with an ant proof sheet. If the entire circumference of the pipe is covered, the termite entry path is cut off, and entry prevention can be achieved.

  Moreover, in the underfloor structure of this invention, it is preferable that all the contact surfaces (the whole area of the thickness direction of underfloor concrete) in the said piping with the said underfloor concrete are coat | covered with the said ant-proof sheet.

  If only a portion of the underfloor concrete thickness direction where the underfloor concrete contacts the pipe is covered with a narrow ant proof sheet, when the displacement of the pipe or concrete occurs due to vibration of the building, etc., it will contact the ant proof sheet. There is a risk of cracking so that only the concrete part peeled off, and the narrow ant protection sheet may not absorb the above displacement and the ant protection sheet may be torn, which can be an entry path for termites There is sex. On the other hand, in the underfloor structure in which the entire surface of the contact is covered with the ant-proof sheet as described above, since the contact area between the ant-proof sheet and the concrete is large, a part of the concrete is peeled off as described above. It does not easily occur, and the ant-proof sheet becomes wide, so that it can absorb the displacement sufficiently and is difficult to tear.

  Furthermore, you may make it coat | cover an anti-rust sheet | seat widely around piping beyond the contact surface with the said underfloor concrete in the said piping. As described above, the concrete procedure is to place the ant-proof sheet on the pipe surface first, and then the concrete is placed. However, if the ant-proof sheet is covered widely around the pipe, the contact surface with the concrete will be ensured. This is because ant-proof sheets can be placed on all of the above. Preferably, assuming that the total width of contact between the underfloor concrete and the pipe (the thickness of the underfloor concrete corresponds to this) is 100%, the ant-proof sheet is covered 110% or more widely around the pipe.

  According to the ant-proofing method according to the present invention, it is possible to perform construction so that termite can be prevented from entering accurately regardless of the skill of the operator. In addition, the underfloor structure according to the present invention does not form a gap around the pipe, and can prevent the entry of termites. Moreover, when displacement occurs in the piping or concrete due to vibration of the building or the like, this displacement can be absorbed by the termite-proof sheet, and there is little risk of creating a termite entry path.

It is sectional drawing which shows the underfloor structure which concerns on one Embodiment of this invention. It is a perspective view showing a mode that the ant-proof sheet | seat is arrange | positioned to piping. It is a perspective view for demonstrating the method of coat | covering a termite-proof sheet | seat on piping. It is sectional drawing for demonstrating a displacement follow-up test method. It is sectional drawing for demonstrating a shear test method [the 1]. It is sectional drawing for demonstrating a shear test method [the 2]. It is a figure for demonstrating a piercing test method. It is sectional drawing showing a mode that the clearance gap was sealed with the conventional sealing material.

<Embodiment>
FIG. 1 is a cross-sectional view showing an underfloor structure according to an embodiment of the present invention. FIG. 2 is a perspective view illustrating a state in which the ant proof sheet 10 is disposed in the pipe 62. In addition, the part which attached | subjected the code | symbol same as FIG. 8 is the same component as the example of FIG.

  In describing the underfloor structure and the ant protection method according to the embodiment of the present invention, first, the ant proof sheet 10 used for this will be described.

  The ant-proof sheet 10 is a concrete waterproofing elastic body containing an ant-proofing agent. As an elastic body for concrete water stop, for example, butyl recycled rubber can be mentioned, which is a single or a mixture of one or more natural rubber, synthetic rubber, thermoplastic elastomer and the like. In addition, a reinforcing agent, a filler, a plasticizer, a softening agent, an anti-aging agent, an adhesive, a processing aid, a colorant, a cross-linking agent, a cross-linking aid, and the like may be appropriately blended in the concrete waterproofing elastic body.

  And 0.5-5 mass% of 1 or more types of boric acid or a boric-acid compound are mix | blended with this elastic body for concrete water stop as an anti-anticide.

  In the production of the ant-proof sheet 10, various additives such as the ant-proofing agent and the reinforcing agent described above are blended into the concrete water-stopping elastic material such as the butyl recycled rubber, and the conventional roll kneading, Banbury mixer, interfacing Kneaded with a null mixer, pressure kneader, etc., and then rolled into a sheet with an extruder, a press molding machine, an injection molding machine, a roller head, etc., and a sheet material having a constant thickness (T: preferably 2 to 5 mm) ( An ant-proof sheet 10) is obtained.

  In addition, it is good also as the ant-proof sheet | seat 10 which contained the anti-rust agent using the elastic body for different types of concrete still water, and laminated | stacked these.

  The hardness of the ant-proof sheet 10 is 55 to 75. This hardness is a value (penetration) measured in accordance with “JIS K 2207 petroleum asphalt penetration (scale of asphalt hardness)”.

  The length of the ant-proof sheet 10 is equal to or longer than the outer peripheral length of the pipe 62. This is for winding around the pipe 62 without interruption.

  Further, the width (W) of the ant-proof sheet 10 (see FIG. 1) is preferably equal to or greater than the thickness of the underfloor concrete 61, and more preferably the width of the ant-proof sheet 10 with respect to 100% of the thickness of the underfloor concrete 61. (W) is 110% or more wide.

  Next, the underfloor structure and the ant protection method of this embodiment will be described along construction procedures.

  First, as in a normal construction method, a pipe (for example, a hard vinyl chloride pipe) 62 is installed before placing the underfloor concrete 61. Then, as shown in FIG. 2, the ant proof sheet 10 is wound around the part of the pipe 62 that is scheduled to penetrate the underfloor concrete 61, that is, the entire outer peripheral surface of the pipe 62 part that comes into contact with the underfloor concrete 61. In this winding, a gap is not formed on the outer peripheral surface of the pipe 62 in the portion. Specifically, if the length of the ant-proof sheet 10 is just the length of the outer periphery of the pipe 62 and is wound so that the ends of the ant-proof sheet 10 are attached to each other as shown in FIG. Good. Alternatively, as shown in FIG. 3 (a perspective view for explaining a method of covering the pipe with the ant-proof sheet), the ant-proof sheet 10 that is long in the circumferential direction may be used to wrap the pipe 62 while providing an overlapping portion.

  The ant-proof sheet 10 has a penetration of 55 to 75 (JIS K 2207, penetration of petroleum asphalt) as described above, and is soft and sticky. It can be adhered.

  The width (W) of the ant-proof sheet 10 is preferably 110% or more wider than the thickness 100% of the underfloor concrete 61 as described above (see FIG. 1). The ant-proof sheet 10 is wound around the pipe 62 in accordance with the concrete placement schedule, but if the ant-proof sheet 10 is 110% or more wide, even if it is roughly wound around the concrete placement place, It is because the ant-proof sheet | seat 10 can be distribute | arranged to the whole piping surface which contacts the placed concrete.

  It is not always necessary to perform the winding operation on the pipe 62 at the construction site. The pipe 62 is wound around the pipe 62 in advance and manufactured by a machine at a factory or the like, and this is disposed at the construction site. You may do it.

  Next, as shown in FIG. 1, an underfloor concrete 61 is placed and cured. The underfloor concrete 61 is located at a place where the ant proof sheet 10 is wound in the pipe 62. As the ready-mixed concrete hardens, the butyl recycled rubber in the composition of the ant-proof sheet 10 acts so as to adhere to the concrete.

  By bonding the underfloor concrete 61 and the ant-proof sheet 10 in this way, the two are firmly integrated, and no gap is formed between the pipe 62 and the underfloor concrete 61. Therefore, there is almost no risk of termites entering the room. Moreover, since the ant-proof sheet 10 contains boric acid and / or a boric acid compound as an ant-proofing agent, termites do not eat through the ant-proof sheet, and entry into the room is reliably prevented.

  In addition, the above-mentioned arrangement method of the ant-proof sheet 10 does not require a high level of skill from the operator and is a simple operation, so that it is possible to provide an underfloor structure of good quality and reduce the construction cost. Can do.

  Further, since the termite sheet 10 has a shear limit displacement rate of 500% or more (preferably 700 to 1500%) in a shear test described later and has good stretchability, it can be applied to underfloor concrete or piping due to various factors such as vibration. Even if displacement such as settling or bulging occurs, the ant-proof sheet follows and expands and contracts. Accordingly, it is difficult for the ant-proof sheet to break and the underfloor concrete cracks, and the risk of a termite entry path is small.

<Experiment>
Various ant-proof sheets were prepared and subjected to a drilling test, a displacement follow-up test, and a shear test. These will be described below.

1. Perforation test 1-1. Penetration test method As an evaluation of the ant-proof performance of the ant-proof sheet, a puncture test is conducted in accordance with Japan Wood Preservation Association Standard No. 13.

  Specifically, as shown in FIG. 7 (a diagram for explaining the drilling test method), two bottomed cylindrical glass cylindrical tubes (diameter 2 cm, height 12 cm) 71 and 72 are provided on the bottom side. The glass cylindrical tube 73 (bore diameter: 1.5 cm, length: 10 cm) 73 having both openings is connected so as to connect these lower portions to form an H shape. A sample 11 having a thickness of 5 mm is prepared, and untreated soils 75 and 76 are packed on both sides of the sample 11 so that the sample 11 is positioned substantially at the center of the connecting cylindrical tube 73. In addition, in order to confirm the termite movement, a sample packed with soil instead of the sample 11 is also prepared for comparison. One standing cylindrical tube 71 is filled with soil 77 up to a height of 2 cm, and the other standing cylindrical tube 72 is filled with soil 78 up to a height of 2 cm and feed tree (red pine wood pieces) 79. From the upper opening 71a of the cylindrical tube 71 containing only the soil 77, 200 termite worker ants and 20 soldier ants are inserted and covered. Then, it is observed that this termite penetrates the sample 11 in the connecting cylindrical tube 73 and enters the standing cylindrical tube 72 with the bait 79. After 21 days, the sample 11 is taken out, and the perforated state formed in the sample 11 is observed. This test is repeated three times, and the one with the most perforation is selected and evaluated.

The evaluation criteria for the perforation test are as follows.
Perforation degree 0: Sample 11 has no perforation.
Perforation degree 1: Slightly perforation is observed in sample 11.
Perforation degree 2: The depth of the perforation is less than 10% of the thickness of the sample 11.
Perforation degree 3: The depth of perforation is 10% to less than 50% of the thickness of the sample 11.
Perforation degree 4: The perforation depth is 50% or more of the thickness of the sample 11 and is not penetrated.
Perforation degree 5: The sample 11 is penetrated.

1-2. Experiment: Recycled butyl rubber: 100 parts by weight, clay: 100 parts by weight, talc: 30 parts by weight, butene-based long chain hydrocarbon: 60 parts by weight, terpene-based tackifier: 10 parts by weight An ant-proof sheet was prepared by blending acids as shown in Table 1 below. A perforation test was performed on this ant-proof sheet. The results are also shown in Table 1.

  As can be seen from the results of the perforation test shown in Table 1, in sample No. 1 in which boric acid is not blended, perforation that penetrated was observed and termite penetration could not be prevented, but if the boric acid concentration was 0.5% by mass or more Termite intrusion can be prevented. Further, it can be seen that the boric acid concentration is preferably 1.0% by mass or more in order to further improve the ant-proofing performance. Samples Nos. 5 to 7 having a boric acid concentration of 3% by mass or more have no damage due to perforation, and it is understood that the boric acid concentration may be 1 to 3% by mass from the viewpoint of avoiding a cost increase due to a large amount of boric acid. .

2. 2. Displacement tracking test 2-1. Displacement follow-up test method Sample (ant proof sheet) 12 was cut into a width of 10 mm and a length of 200 mm, and as shown in FIG. 4 (cross-sectional view for explaining the displacement follow-up test method), two stainless steel plates 81 and 82 were cut. It is pressure-bonded by reciprocating between the rollers with its own weight of 2 kg with a gap in between. This is set in the tensile test jigs 83 and 84, pulled in the separating direction by a universal tensile testing machine (arrow A shown in FIG. 4), and visually checked how the ant-proof sheet 12 is torn, and until the break Measure the displacement (tensile limit displacement). The “tensile limit displacement amount” is a value obtained by subtracting the thickness of the sample before the displacement follow-up test from the thickness of the sample 12 immediately before tearing.

2-2. Experiment Same basic composition as the above perforation test (butyl recycled rubber: 100 parts by mass, clay: 100 parts by mass, talc: 30 parts by mass, butene-based long chain hydrocarbon: 60 parts by mass, terpene-based tackifier: 10 parts by mass 2% by weight boric acid and kneaded with a 1 L pressure kneader, and using an extrusion molding machine, 0.5 mm, 1.0 mm, 3.0 mm, 5.0 mm thick ant-proof sheet (Sample No. 8-11) were prepared. A displacement follow-up test was performed on these ant protection sheets (Sample Nos. 8 to 11) as described above. As a comparison, a displacement follow-up test was conducted in the same manner as described above for a butyl rubber double-sided tape (Sample No. 12) having a thickness of 0.1 mm. These results are shown in Table 2.

  As can be seen from Table 2, in the ant-proof sheet having a thickness of 3.0 mm or more (Sample Nos. 10 and 11), it can be seen that the tensile limit displacement amount is large and the elongation is good. Therefore, according to the ant-proof sheet having a thickness of 3.0 mm or more, even if the underfloor concrete or piping is displaced due to vibration or the like, the ant-proof sheet follows the displacement and expands / contracts, cracks or breaks. Etc., and thus there is little risk of a termite entry route. On the other hand, it can be seen that Sample No. 12 (double-sided tape) has a small tensile limit displacement and hardly follows deformation.

3. Shear test 3-1. Shear test method [Part 1]
As shown in FIG. 5 (cross-sectional view for explaining the shear test method [part 1]), a sample (ant-proof sheet) 13 is wound around the outer periphery of a vinyl chloride tube (product number VU50A) 91 having an outer diameter of 60 mm, A vinyl chloride tube (product number VU150A) 92 having an outer diameter of 165 mm is disposed on the outside, and concrete 93 is placed between these at a height (thickness) of 100 mm and cured. In addition, the thickness of the underfloor concrete in a building underfloor structure is usually 100 mm, and the concrete 93 is adapted to this. After the concrete 93 is hardened, a vinyl chloride pipe (product number 100A) 94 having an outer diameter of 114 mm is laid on the concrete 93 so as to surround the vinyl chloride pipe 91, and this is used as a water filling portion 95. This is installed on the gantry 96. At this time, the vinyl chloride pipe 91 is positioned in the opening 96 a provided in the gantry 96.

Water is poured into the water filling portion 95, the vinyl chloride tube 91 is pressurized downward by the pressurizing jig 97 (arrow B in FIG. 5), and pushed in until the sample 13 is broken. When the water in the water filling portion 95 leaks under the gantry 96, the sample 13 is broken, and the position of the vinyl chloride pipe 91 at this time (the vinyl chloride pipe 91 and the pressure jig 97 drawn with a solid line in FIG. 5) The difference from the initial position (the vinyl chloride pipe 91 and the pressurizing jig 97 drawn with a two-dot chain line in FIG. 5) is the shear limit displacement (Δh). Also, the shear limit displacement rate (%) is obtained by the following formula (1).
Shear limit displacement rate (%) = shear limit displacement amount Δh (mm) / initial thickness of sample (mm) (1)
Note that the above shear test method assumes a case where piping or under-floor concrete is displaced in the actual under-floor structure of a house, and if this test result is good, it can be said that it is difficult to generate an entry path for termites. it can.

3-2. Shear test method [2]
As shown in FIG. 6 (cross-sectional view for explaining the shear test method [2]), a vinyl chloride tube (product number VU150A) having an outer diameter of 165 mm is provided outside a vinyl chloride tube (product number VU50A) 91 having an outer diameter of 60 mm. ) 92 are placed, and concrete 93 is placed between them at a height (thickness) of 100 mm and cured. Next, a sample (modified silicone caulking agent containing an anti-bacterial agent) 63 is applied to the corner portion of the boundary between the concrete placing portion and the vinyl chloride pipe 91, and cured and cured. The sample (caulking agent) 63 is applied only on the lower side as shown in FIG. Incidentally, the treatment with the modified silicon caulking agent is a piping treatment generally performed in the past.

  Thereafter, in the same manner as the shear test method [Part 1], a vinyl chloride pipe (product number 100A) 94 having an outer diameter of 114 mm is laid so as to surround the vinyl chloride pipe 91, and this is used as a water filling portion 95. , Installed on the gantry 96. At this time, the vinyl chloride pipe 91 is positioned in the opening 96 a provided in the gantry 96.

  Next, water is poured into the water filling portion 95, the vinyl chloride tube 91 is pressurized downward by the pressurizing jig 97 (arrow B in FIG. 6), and pushed in until the caulking agent 63 breaks. When the water in the water filling portion 95 leaks under the gantry 96, the caulking agent 63 is broken, and the position of the vinyl chloride pipe 91 at this time (the vinyl chloride depicted in FIG. The difference between the pipe 91 and the pressurizing jig 97) and the initial position (the vinyl chloride pipe 91 and the pressurizing jig 97 drawn by a two-dot chain line in FIG. 6) is defined as a shear limit displacement amount (Δh). Also, the shear limit displacement rate (%) is obtained by the equation (1) in the same manner as the above method [1].

3-3. Experiment: In the same manner as the displacement follow-up test, ant-proof sheets (sample Nos. 10 and 11) having a thickness of 3.0 mm and 5.0 mm were prepared (containing 2% by mass of boric acid), and a shear test (method [ Part 1]) was performed. Further, a shear test (method [part 2]) was performed on a modified silicon caulking agent (sample No. 13) containing 2% by mass of boric acid. These results are shown in Table 3.

  Sample No. 13 (in the case of caulking agent treatment) has a shear limit displacement of only 2 mm as shown in Table 3, and sample No. 13 (caulking agent) peels off from the vinyl chloride tube 91 side, causing water leakage. It was. Therefore, in the process of filling the corner portion with the caulking agent, there is a possibility that a gap is easily generated due to the vertical movement of the pipe or the like and a termite entry path is generated.

  On the other hand, in the case of the ant-proof sheet, as can be seen from Table 3, the shear limit displacement rate is 900% for the sample No. 10 (3.0 mm thick ant-proof sheet) and the sample No. 11 (5.0 mm thick ant-proof ant). Sheet) was 1100%, which showed a very good deformation displacement.

  Even when assuming permanent displacement such as vertical movement of the pipe or subsidence / lift, if the ant-proof sheet has a shear limit displacement exceeding 20 mm, it will peel off or drop off from the concrete surface and the vinyl chloride pipe surface. It is assumed that no crack occurs in the ant-proof sheet itself. Therefore, according to the above sample Nos. 10 and 11, even if the underfloor concrete or piping is displaced such as bulging or sinking, good sealing performance can be exerted, and there is little possibility of causing a termite entry path.

  Although the present invention has been specifically described with reference to examples, the present invention is not limited by the above examples as a matter of course, and of course may be implemented with appropriate modifications within a range that can be adapted to the above purpose. All of these are possible within the scope of the present invention.

10, 11, 12, 13 Ant protection sheet 61 Underfloor concrete 62 Piping

Claims (7)

It is an underfloor structure in which the space between the underfloor concrete and the pipe that penetrates the underfloor concrete is prevented,
An underfloor structure characterized in that a sticky and plastically deformable sheet-like material obtained by adding an antifungal agent to an elastic body for concrete water-stopping is disposed on a contact surface of the pipe with the underfloor concrete. .   The underfloor structure according to claim 1, wherein the concrete water stop elastic body is mainly composed of recycled butyl rubber as a rubber component thereof.   The underfloor structure according to claim 1, wherein the termite-proofing agent is boric acid and / or a boric acid compound.   The underfloor structure according to any one of claims 1 to 3, wherein the content of the termite-proofing agent is 0.5 to 5% by mass.   The underfloor structure according to any one of claims 1 to 4, wherein the sheet-like material has a thickness of 2 mm or more.   The underfloor structure according to any one of claims 1 to 5, wherein all contact surfaces of the pipe with the underfloor concrete are covered with the sheet-like material. An ant-proof method between underfloor concrete and piping that penetrates the underfloor concrete,
A sticky and plastically deformable sheet-like material obtained by adding an antifungal agent to an elastic body for concrete still water is placed on the surface of the pipe that contacts the underfloor concrete, and then the underfloor concrete is placed. A method for preventing ants.

Images