JPH0360378B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention facilitates and accurately conducts preliminary investigation of repair work such as lifting of mortar on the back of a building having a finished mortar surface or concrete surface and various investigations necessary for construction management. The present invention relates to a method of diagnosing buildings that can be implemented in the future.

[Technical Background of the Invention] Generally, concrete structures such as buildings have a structure in which finishing mortar is applied to the surface of the concrete frame, and external wall decoration materials such as tiles are further pasted on the surface. In such buildings, as the finishing mortar ages, the back side of the building may lift or crack, making it necessary to repair the building by injecting an epoxy resin adhesive or the like to the outside.

As a preliminary investigation before carrying out such repair work, it is necessary to diagnose the necessity of repair, the depth and width of cracks floating on the back of the mortar, and the moisture level and carbonation of non-adhesive surfaces in order to select adhesives. There is.

The conventional method for diagnosing such buildings is to peel off the tiles near the area that requires repair (this location is estimated by percussion, etc.), and then remove the tiles 10 cm inward toward the interior.
The so-called core extraction method was used, in which a plurality of inspection holes of approximately 100 degrees were drilled, the inner surface of the holes was visually inspected, and repairs were made through the inspection holes as necessary.

[Problems with the background art] However, in such conventional methods, the drilling work is large-scale because the investigation hole is large in diameter.
In addition, there were other difficulties, such as the fact that it was practically difficult to repair the investigation hole after repair. Diagnosis of such buildings is also necessary for construction management during building construction, in order to discover and prevent poor adhesion and shoddy work that could lead to personal accidents, but conventional methods cannot For the same reasons as the preliminary survey for repair work, it was difficult to conduct it.

[Purpose of the Invention] The present invention has been made in order to solve these conventional difficulties, and it is possible to perform preliminary surveys for repair work and various surveys necessary for construction management by eliminating the need for large-scale destructive surveys, which are similar to conventional methods. The present invention aims to provide a method that can be easily carried out without drilling a large-diameter hole that is difficult to repair, and that can provide accurate diagnosis.

[Summary of the Invention] That is, the present invention involves drilling a survey hole inward from the surface of a building having a finished mortar surface or a concrete surface, and displaying a scale on the inner surface of the survey hole. By inserting an adapter with a visual window formed along the scale, and inserting an endoscope into this adapter to inspect the inner surface of the investigation hole through the window of the adapter,
It is possible to easily and accurately carry out preliminary investigations for repair work such as mortar back lifting and various investigations necessary for construction management.

[Embodiments of the Invention] Examples of the present invention will be described below based on the drawings.

FIG. 1 is a sectional view of a building being diagnosed according to the present invention.

In the figure, this building has a structure in which mortar 2 is applied on a concrete frame 1, and tiles 3 are pasted on top of it, and numeral 4 indicates a floating crack on the back of the mortar that has occurred on the back of the mortar. .

In this embodiment, first, a blind hole 5 is drilled toward the outside and inside using a drill or the like. This blind hole 5
The inner diameter should be within 10mm, and the drilling position should be tile 3.
As shown in FIG. 2, it is preferable to use the intersecting portion 3a of the horizontal joint and the vertical joint. This is because the tiles 3 are usually constructed with a joint width of 8 to 12 mm, so the blind hole 5 can be easily repaired, the effect on the construction surface is small, and the inspection can be virtually non-destructive.

Next, in this blind hole 5, as shown in FIG. 3, a window 6b is formed in the longitudinal direction of a cylinder having a flange 6a formed at one end, and a scale 6 is formed in the longitudinal direction of the inner surface.
Insert the adapter 6 marked c until the inner surface of the flange 6a and the surface of the building become substantially flush. Note that the scale 6c may be formed directly on the inner surface of the adapter 6, or a known crack scale 7 as shown in FIG. 3 may be attached, for example. Furthermore, this adapter 6 may have a structure in which a strip-shaped scale support piece is fixed to the inner periphery of the flange 6a in parallel to the axis of the flange 6a.
The crack scale 7 shown in Fig. 3 has a 1/1 scale depth scale 7a displayed on one side edge for measuring the depth of the crack from the wall surface, and a depth scale 7a on the other side for measuring the depth of the crack from the wall surface. A crack scale 7b indicating the crack width in several stages from 0.04 to 1.20 mm is displayed so that the depth and width of the crack position can be directly read.

Thereafter, an endoscope 8 is inserted into the adapter 6, and the inner surface of the blind hole 5 is photographed endoscopically to perform various diagnoses as will be described later. When inserting the endoscope 8, the lens 8a is placed concentrically with the side wall of the blind foramen 5 in order to facilitate focus adjustment and ensure that the lens is always focused on the inner surface of the blind foramen 5. The adjuster 9, which can be vertically moved and rotated, is attached to the adapter 6.
It is desirable to fit it on the upper end.

A well-known borescope is used as the endoscope 8, and a direct-viewing type, a side-viewing type, a front-oblique-viewing type, etc. are appropriately selected and used. In particular, a side-viewing type borescope is suitable for the present invention. Further, the camera and light source device set in the endoscope 8 are appropriately selected from known ones according to the purpose and contents of the examination. Incidentally, if a battery is used as a power source for the light source device, investigation and photographing operations can be facilitated.

Inspection items to which the present invention can be applied will be described below along with methods thereof.

(b) In order to design the pin length to effectively fix tanker pins used for injection adhesive repair of tiles and mortar back surface floating on the concrete structure, record the tile mortar back surface floating cracks along with the depth scale 7a by endoscopic photography.

(b) To measure and record the width of floating cracks on the back surface of tiles and mortar, and to select injection adhesives, mark the crack scale 7b on the floating cracks on the back surface of the mortar confirmed with an endoscope.
This will also be recorded using endoscopic photography.

(c) Neutralization of concrete framework and mortar is correlated with aging of the framework and mortar adhesion, so pour a 1% alcohol solution of phenolphthalein into the blind hole 8 to deepen the bright red border caused by the alkaline reaction. It is recorded by endoscopic photography together with the scale 7a.

(d) To select the injection adhesive, inject the cobalt chloride mixed reagent powder, and when the bright red reagent powder turns blue, record it with an endoscope.

(e) Adhesion failure occurs when a layer is formed on the surface to be adhered due to eflotsense. Efrotu sense is
When wet, it is strongly alkaline, but when dry it is neutral, so using this property, we poured a 1% alcohol solution of phenolphthalein into the blind hole 8 and recorded the bright red white layer that did not react with alkali using endoscopic photography. do.

(F) Adhesion failure may occur on the surface to be adhered due to mold, mud, etc. The abnormal color of mold and mud will be recorded by endoscopic photography when the light brown color changes to blackish brown due to negligence.

(G) Pinning after construction In order to confirm whether the adhesive pin is effectively fixed to the concrete structure, the position on the surface is confirmed with a metal detector, and then the blind hole is drilled along the pin and the pin is inserted. Tip of the tile, mortar back floating crack, depth scale 7
Recorded by endoscopic photography along with a.

(H) If water is present, general-use epoxy resin adhesives will react with water and become cloudy, causing poor adhesion, and even wet-use epoxy adhesives will have a reduced adhesive strength. In addition, adhesion strength decreases due to concrete dust and dirt due to poor cleaning. These will be recorded by endoscopic photography.

(li) Concrete dust at the entrance/exit will cause poor filling of the injection material and poor fixation of the anchor, so record the status of dust cleaning at the epoxy injection port using endoscopic photography.

(v) Drill blind holes at every unit distance from the injection port, and confirm the injection range of the adhesive for back floating crack injection using an endoscope.

(l) Drill the above-mentioned investigation holes along the cracks that have occurred on the surface, and record them by endoscopic photography along with the depth scale 7a.

(E) In order to measure the actual effect and depth of permeable waterproofing materials, water repellent materials, etc., apply the permeable waterproofing materials, water repellent materials, etc., make blind holes after drying, and dilute the water-based red material with water. The ink liquid is poured into the impregnated area of the permeable waterproof material, water-repellent material, etc., and the colored boundary is recorded by endoscopic photography along with the depth scale 7a, taking advantage of the property that the water-based red ink does not color the impregnated area.

(W) Other problems include interfacial peeling cracks at areas where concrete defects have been repaired, condensation water on the concrete on the back of the elastic finishing material, moisture content due to infiltrating water, floating cracks on the back side of mortar and moisture on the bonded surface, condensation water on the back side of areas where concrete defects have been repaired, and moisture content due to infiltrating water. Moisture content, floating cracks on the back of mortar, moisture on the bonded surface, measurement of reinforced concrete reinforcing bar position, cross-sectional position of pinning injection adhesive pins, waterproof protection water on the back of mortar, tiles,
It can be used to measure and record the depth of mortar back floating cracks, tiles, mortar back floating crack widths, etc.

[Effects of the Invention] As is clear from the above embodiments, according to the present invention, an investigation hole is drilled in a building, an adapter with a scale displayed is inserted into the investigation hole, and an internal view is inserted into the adapter. Since diagnosis is performed by inserting a mirror, preliminary surveys for repair work and various surveys necessary for construction management can be conducted easily and non-destructively.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a building undergoing diagnosis according to an embodiment of the present invention, FIG. 2 is a top view thereof, FIG. 3 is a perspective view of the adapter shown in FIG. 1, and FIG. 4 shows its scale. FIG. 1... Concrete frame, 2... Mortar, 3
...Tile, 4...Crack floating on the back of mortar, 5...
...Blind hole, 6...Adapter, 6a...Flange, 6
b...Window section, 6c...Scale, 7...Crack scale, 8...Endoscope.

Claims (1)

[Scope of Claims] 1. A survey hole is drilled inward from the surface of a building having a finished mortar surface or a concrete surface, and a scale is displayed on the inner surface of the survey hole, and a scale is displayed along the scale. 1. A method for diagnosing a building, which comprises inserting an adapter having a window for visual inspection, inserting an endoscope into the adapter, and inspecting the inner surface of an investigation hole through the window of the adapter. 2. The method for diagnosing a building according to claim 1, wherein the investigation hole is a blind hole. 3. The method for diagnosing a building according to claim 1 or 2, wherein the inner diameter of the investigation hole is within 10 mm. 4. The method for diagnosing a building according to any one of claims 1 to 3, wherein the endoscope is concentrically and rotatably inserted into the adapter. 5. The method for diagnosing a building according to any one of claims 1 to 4, wherein the adapter has a flange at one end. 6. The method for diagnosing a building according to any one of claims 1 to 5, wherein the inspection hole is drilled in the tile joint.