JPS60260835A - Biological deterioration factor detecting method of structure - Google Patents

Abstract

PURPOSE:To detect a deteriorating factor of a structure, such as an ant path, a mycelial bundle of a deterioration fungus, a water leakage, etc. by forming a pair of conductive paths on the wall surface of a strip footing of the structure, and detecting whether a conduction exists between said conductive paths or not. CONSTITUTION:Two conductive materials 4, 5 are provided adjacently and about horizontally on a rise side face of a strip footing 2 of an electric insulating property consisting of a concrete member, etc. constructed on the ground 1, one end is held in a non-contact state, and the other end is connected to a power source 6 and a detecting device 7. According to such a constitution, when a white ant, etc. crawls up the wall surface of the strip footing from the ground 1, a conductive path is formed on its ant path by a secreting fluid of an ant, the conductive materials 4, 5 are short-circuited, a mucelial bundle of a deterioration fungus creeps up the strip footing from in the ground, it contacts to the conductive materials 4, 5 on its process, the conductive path 11 is formed by moisture of the mycelial bundle, and the conductive materials 4, 5 are short-circuited, therefore, the deteriorating factor of the structure is detected in its early state by operating the detecting device 7.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for early detection of biological deterioration factors of a wooden structure, such as cleansing, decay, and water leakage.

[Industrial application field]

It is generally said that biological deterioration of structures such as houses and warehouses due to cleanliness, decay, etc. begins at the foundation of the structure. Among these, deterioration caused by termites is caused by the termites crawling up the walls of concrete foundations from underground, creating ant trails, and gradually damaging the foundations and subfloor members all the way to the pillars. . In addition, the damage caused by rotting fungi is especially severe in cold regions where the damage caused by Namida mushrooms is severe, but in this case, the rotting fungi extend bundles of hyphae from the soil and crawl up the concrete fabric foundation surface, causing damage to foundations and subfloor materials. It causes damage.

Furthermore, since wood decay also occurs when wood retains moisture exceeding a certain moisture content for a long period of time, water leakage and condensation into foundations and subfloor components are also considered to be major biological deterioration factors.

Furthermore, it is well known that the foundation is the part of a house that is most frequently subject to deterioration or decay, but if the foundation suffers biological deterioration due to deterioration or decay, the damage will be limited to the cost of materials for the foundation. If the damage continues, the cost of repairing the entire structure associated with replacing the foundation will be enormous.

[Conventional technology]

However, because it is difficult to predict at the time of construction whether the wooden parts that make up the foundation of the structure will be subject to biological deterioration due to termites, rotting fungi, etc. in the future, the building is left unattended regardless of whether or not such damage will occur in the future. Because soil and the wooden parts of structures near the soil are subject to biological deterioration, treatment with termiticides such as chlordane and preservatives such as organochlorine, organotin, and heavy metals are applied at the time of construction. Furthermore, even if such termiticides and preservatives are applied at the time of construction, their effects are not permanent; their effects will fade over time, and eventually, unnoticed, they will deteriorate due to dirt and decay. In many cases, this is progressing, and to prevent this, it is necessary to treat with termiticides and preservatives as needed.

However, such indiscriminate application of termiticides, preservatives, etc. results in unnecessary waste of expensive chemicals, and the associated negative effects such as environmental pollution have recently become a problem. .

[Problem that the invention seeks to solve]

The present invention detects the above-mentioned biological deterioration factors for wooden structures, mainly foundations and subfloor components, at an early stage, and when these factors are detected, performs anti-termite treatment, antiseptic treatment, etc. Avoid indiscriminate application of termiticides and preservatives,
This was done with the aim of reducing the cost burden required for treatment with these chemicals and preventing environmental pollution due to indiscriminate application.

[Means for solving problems]

That is, the present invention provides a conductive path including a conductive path made of a conductive material attached to a wall surface of a part of a structure close to the ground or other part where biological deterioration is expected, and a conductive path formed by a biological deterioration factor of the structure. In this method, a detection device is interposed in a closed circuit formed by a path, and the detection device is actuated by a change in the electrical characteristics of the closed circuit to detect biological deterioration factors of a structure.

The present invention will be explained in detail below based on the accompanying drawings showing examples.

FIG. 1 shows an example of the implementation means of the present invention, in which a wooden base 3 is placed on an electrically insulating cloth foundation 2 made of concrete members etc. constructed on the ground 1.
Two conductive materials 4 and 5 are attached to the rising side surface of the cloth foundation 2 in close proximity, almost horizontally and in parallel, without any break, and one end portion 4a, 5a of each of the two conductive materials 4, 5 is in a non-contact state. The other end portions 4b and 5b are connected by a wiring 8 with a power source 6 and a detection device 7 interposed therebetween.

In this configuration, the conductive materials 4 and 5 include conductive metals such as copper and aluminum, conductive plastics blended with silver powder, carbon, etc. to impart conductivity, conductive rubber,
Either a solid state or a liquid state such as a conductive paint can be used, but it is preferable to use a material whose surface conductivity does not deteriorate over time due to oxidation or the like.

In addition, in order to attach these conductive materials, it is necessary to form them directly on the non-conductive parts of the structure such as the cloth foundation 2 or the foundation 3 by methods such as attaching, coating, or printing, or by attaching them to the non-conductive parts near the ground of the structure, such as the cloth foundation 2 or the foundation 3, or by attaching them to non-conductive parts in the form of tape. A conductive material is attached, coated, printed, etc. to the material in advance and attached by adhesion or the like. In this case, the tape-shaped non-conductive material is preferably made of a porous material with low thermal conductivity and is resistant to condensation in winter, such as foamed urethane, foamed polystyrene, foamed polyethylene, foamed styrene-butadiene rubber, etc. can be used.

In the case of a general house, it is particularly desirable to install the above-mentioned conductive material on the rising part of the concrete foundation, and it is preferable to install it on the inner circumferential surface rather than the outer circumferential surface in order to eliminate interference factors from the outside. desirable. Further, the power source 6 may be either a battery or a lead-in power source.

Furthermore, the detection device 7 may be any device that can detect changes in electrical characteristics such as changes in the current flowing through the wiring 8 and convert it into a signal that can be visually confirmed by a lamp display or the like or audibly by an alarm buzzer or the like. It can be anything.

FIG. 2 shows an outline of an electric circuit used in the implementation means of FIG. 1. In the figure, 4 and 5 are conductive materials, 6 is a power source, and 7
is the detection device, ga, 13b is the wiring, 9 is the resistor, 10 is the npn) When a small current flows through the circuit with a transistor, this is amplified to obtain the current necessary for the operation of the detection device 7. It is.

[For production]

Next, to explain the operation of the implementation means shown in FIG.
During cooling, a conductive path 11 is formed by the ant's secretion, and the conductive materials 4 and 5 are short-circuited by this conductive path 11, and the mycelial bundles of decay fungi crawl up the cloth foundation 2 from underground 1, and this process The mycelial bundle containing moisture forms a conductive path 11 and short-circuits the conductive materials 4 and 5, thereby causing the conductive materials 4 and 5, the detection device 7, and the power supply A closed circuit is formed between the wires with the detection device 7 interposed therebetween.
is activated to predict that a bundle of fresh and decaying fungi and hyphae has reached the vicinity of the base 3.

Therefore, if measures are taken to exterminate termites and decay fungi as soon as the detection device 7 is activated, biological deterioration of wooden structures such as foundations can be prevented.

Further, in the case where a conductive path is formed that short-circuits the conductive materials 4 and 5 due to water leakage, dew condensation water, etc., the detection device 7
can be activated to predict their occurrence. Therefore, by attaching conductive materials to the inner surface of the roof base, attic, beams, etc., it is possible to detect at an early stage the occurrence of water leaks such as rainwater, permanent water, etc., and the occurrence of condensation water in these areas. .

In addition, in order to avoid malfunctions caused by lightning, rotting fungi, and other small animals such as slugs and rats, the circuit will not operate if electricity is applied momentarily, and the detection device will only activate if electricity is applied continuously for a certain period of time. Any known timer circuit designed to operate may be incorporated into the circuit of FIG.

[Other Examples]

FIG. 3 shows an implementation means in which an electrical resistor 12 is interposed at an appropriate interval between one or both of the conductive materials 4 and 5 of FIG. By changing the amount of current flowing through the closed circuit depending on the position of the closed circuit of the materials 4 and 5, and changing the type of alarm etc. of the detection device 7 and the level of failure etc. according to the change in the amount of current, biological deterioration can be prevented. It becomes possible to detect the location where the cause occurs.

The electric circuit in this case is the same as that shown in FIG.

FIG. 4 shows another example of the implementation means of the present invention. In this implementation means, a piece of conductive material 13 is attached almost horizontally to a part of the structure close to the ground, and both ends of the conductive material 13 are attached to the structure near the ground. It is configured by connecting a power source 6 and a detection device 7 with wiring 8.

In this case, a constant current is constantly applied to the wiring 8, and due to some biological deterioration factor, the conductive material 13 and the ground 1
When a conductive path 11 is formed between the wiring 8 and the wiring 8 and the wiring 8 is grounded, a change in the electrical characteristics of the wiring 8 is detected by the detection device 7.

FIG. 5 shows still another example of the implementation means of the present invention. In this implementation means, a single conductive material 1.4 is attached almost horizontally to a part of the structure near the ground as in the above-mentioned implementation means, and only one end 14a of the conductive material 1.4 is connected to the 1)np) transistor 15.
The resistor 15 amplifies the minute current when the conductive material is grounded to form a grounded closed circuit. This is to obtain the current necessary for operating the detection device W7.

The effect in this case is that a conductive path 11 is formed between the conductive material 14 and the ground 1 due to some biological deterioration factor, and a grounded closed circuit is formed between the conductive material 14 and the ground 1. The detection device 7 is activated.

[Test example]

Test example (11) A house termite was placed on a substrate with a width of 70 cm, a length of 140 cm, and a height of 10 cm.
The animals were reared in a 0cm concrete tank, and a sensor consisting of two copper wires glued in parallel to a polyurethane foam sheet was attached near the inner upper edge of the concrete tank, and the power supply and power supply were connected according to the wiring diagram shown in Figure 2. Wired with a detection device (lamp lighting method).

The breeding tank was placed in an environment with 100% relative humidity,
Due to the fineness of the Japanese termite, it was possible to completely detect it before it reached the upper edge of the tank, and no malfunctions occurred.

Test Example (2) A concrete tank similar to Test Example (11) was used to culture and propagate Namidata mushrooms, which are a type of decay fungus, and a cyanoacrylate-based conductive adhesive was applied to a foamed polyethylene sheet near the inner upper edge of the tank. was applied in two rows and attached as a sensor, and wired in the same manner as in test example (1).The culture tank for Physcomitrella spp. Full detection was possible before reaching the edge, and no malfunctions occurred.

〔Effect of the invention〕

As explained in detail above, according to the present invention, the occurrence of biological deterioration factors of structures such as termites, rotting fungi, water leakage, and dew water can be easily detected before the biological deterioration of the structure progresses. It becomes possible to take appropriate control measures such as extermination depending on the situation. Therefore, since this pest control measure only needs to be applied when the detection device is activated, the indiscriminate application of termiticides and preservatives can be avoided, and the cost required for chemical treatment can be significantly reduced. It also has the advantage of significantly contributing to the prevention of environmental pollution.

[Brief explanation of drawings]

FIGS. 1, 3 to 5 are diagrams showing an example of the implementation means of the present invention, and FIG. 2 is a schematic diagram of a wiring diagram used in the implementation means of FIG. 1 or 3. . 1... Ground, 2... Cloth foundation, 3... Foundation, 4,5
, 13.14... Conductive material, 6... Power supply, 7...
- Detection device, 8... Wiring, 10.15... Transistor, 11... Conductive path formed by biological deterioration factor, 12... Resistor. Patent applicant Sanyo Wood Preservation Co., Ltd.

Claims (1)

[Claims] A detection device is interposed in a closed circuit formed by a conductive path including a conductive path made of a conductive material attached to the wall surface of the structure, and a conductive path formed by biological deterioration factors of the structure, and a detection device is interposed in the closed circuit. A method for detecting biological deterioration factors of a structure, comprising activating the detection device based on a change in electrical characteristics.