JP3390123B2 - Crack monitor method and method in crack frame - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
Method and its crack monitor-Applicable to the law frame installed by concrete layer or mortar layer on the slope, and prevent accidents such as collapse of natural ground due to earthquake or other natural disasters. Its purpose is to provide security management and its equipment.

[0002]

2. Description of the Related Art Generally, cut slopes, cliffs, and landslide slopes are constructed in order to prevent collapse due to rainwater or an earthquake. Among them, there is an unknown part that cannot be predicted as to how much it can withstand sudden collapse due to changes in the crust and changes in groundwater veins, and landslides due to changes such as earthquakes.

[0003]

The cracks that occur in the above legal framework can often be detected as a danger by inspection when the cracks are widened due to a drastic change in the natural environment such as an earthquake. Security measures such as repair work will be taken. However, if the crack is thin in the framework of the concrete or mortar layer, it does not always lead to a collapse accident. However, if the crack breaks further expand, it may lead to a fall accident, so it is originally desirable to continuously monitor day and night. In that case, it is completely unclear whether it will occur in a short period of time or it will take a long period of time.To perform a monitoring posture manually will cause a great obstacle to labor management such as work time and fatigue, and work cost will be high. In reality, it is the actual situation to monitor mainly cracks that have a high probability of causing an accident. By the way, in the Gunma prefecture where the applicant is located, the southeastern part is open in the Kanto plain, but most of it is in the mountains, and many facilities have steep slopes. Therefore, it is often the case that the geology of the slope has an extremely complicated aspect due to various generation processes. In order to protect those facilities, slope protection methods such as vegetation work, mortar spraying, concrete spraying, and framing by the shotcrete method are conspicuously constructed on the slopes. Has been done. Among these slope protection methods, in recent years, the frame method has been widely adopted, and more advanced slope protection methods have been constructed. However, the slope frame method works well as a slope protection method against small-scale local collapses,
Uncertainties that cannot be predicted as to changes beyond the limits specified, for example, how much can withstand landslides due to changes in the crust or changes in groundwater veins over time or changes in earthquakes, etc. There is the current situation.

[0004]

Therefore, the present invention is provided to solve the above-mentioned conventional problems and to achieve the object of the present invention. That is, the purpose is to detect cracks appearing in a facility locally or at a time of change exceeding a preliminarily assumed limit to prevent further destruction of the facility and eventually prevent a disaster that may occur as a result. According to a first aspect of the present invention, in a crack monitoring method for a law frame, the surface in the height direction of a single or several beams at the time of placing concrete or mortar for placing the law frame on the slope of the natural ground. The annealed copper wire is placed in the portion corresponding to the upper layer close to, and the hard copper wire is placed in the portion corresponding to the lower layer close to the slope and stretched, and the copper wire is folded back and forth at approximately the middle portion of the entire length and reciprocated. Installed so as to embed the copper wire, and pull out both ends of the copper wire to a detectable location to expose it, and use this terminal to detect the occurrence of concrete or mortar cracks by cutting the copper wire. It was done. A second aspect of the present invention is a crack monitoring device for a method frame, in which a method frame is formed on a slope by concrete or mortar casting, and a constant impact is applied to a single beam or several beams during the casting. It is configured so that a broken copper wire is wrapped around a hook, folded back in a U-turn shape, reciprocated, embedded and installed, and a detection tool is attached to the end of the copper wire to check for the presence of a break. is there.

[0005]

The operation according to the present invention is as follows. That is, inside the formwork that forms the beam of spray concrete and spray mortar during the construction of the slope on the slope of the natural ground, in the part corresponding to the lower layer near the natural ground and the part corresponding to the upper layer near the surface. While arranging a copper wire that can be an enamel coil so as to reciprocate, mortar and concrete are placed to form a beam of a method frame. With about two copper wires as one set, extend each copper wire to a place where both terminals can be inspected, and expose it at a position under the slope where it is easy to inspect so that both terminals are aligned and summarize this. And store it in the terminal storage box. In the above method, after an earthquake, etc.,
An alarm lamp is connected where power can be obtained by using copper wire terminals, or a place where power cannot be obtained is checked periodically by a tester to check for breaks.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an explanation will be given of an embodiment of a crack monitoring device and its device in a concrete mortar method frame of the present invention with reference to the drawings. Figure 1 is a front view of a concrete framing work on the slope of a natural ground with a crack monitor,
Figure 2 is a longitudinal sectional view of FIG. 1, FIG. 3 is an enlarged view of a portion of FIG. 2, FIG. 4 is a sectional view taken along the line 4-4 in FIG. 3, section 5 showing a legal frame molding process of FIG. 4 FIG, 6 is a longitudinal sectional view showing a molding process of FIGS. 5, FIG. 7 is a longitudinal sectional view showing a state of the copper wire when the law frame collapsed. In FIGS. 1 to 7, 1 is a slope of natural ground, 2 is a concrete or mortar frame, and a lattice is formed with beams 3 arranged vertically and horizontally. Reference numeral 4 is a formwork for forming a concrete or mortar method frame, and 5 is a reinforcing rebar of the method frame. In the illustrated example, four beams are embedded in the required beam 3 at positions relatively close to the four corners. Reference numeral 6 denotes a copper wire, which is arranged inside the beam 3 apart from the left and right rebars 5 when concrete or mortar is cast on the beam 3 as in the case of burying the rebar. In copper wire on the lower of the respective embedded fixed arranged in two rows in a state of being reciprocally folded in a U-turn shape, and exposed by pulling out the terminal of the copper line to check possible from the surface of the beam 3 <br/> In this case, a hard copper wire is arranged in a portion 31 corresponding to the lower layer and a soft copper wire is arranged in a portion corresponding to the upper layer when the beam 3 is cast. Both the soft copper wire and the hard copper wire have a diameter of 0.5 to 0.7 mm, and the length of the copper wire 6 is set to a slope length (m) × 2 (reciprocating portion). As the annealed copper wire, one having an appropriate annealing function, flexibility and high elongation is used. Further, in the case of a hard copper wire, the copper wire before being annealed is set to have elasticity and a low elongation rate. The above-mentioned copper wires are appropriately combined and arranged inside the beam 3 by utilizing their hard and soft properties. Reference numeral 7 is a hooking tool which is composed of a fixing nail or the like for winding an intermediate portion of the entire length of the copper wire 6 and folding it back in a U shape to reciprocate. 8 is a copper wire terminal storage case, 9
Is a detection instrument for monitoring cracks. The end of the copper wire 6 is pulled into the detection instrument, a current of 8 to 12 V is applied, the disconnection state is electrically monitored, and if a disconnection occurs, copper is detected in the detection instrument. Set the red lamp connected to the line terminal to light. The detection device shall be made of a stainless steel plate and shall be installed with a window at the nearest location to the construction site.

[0007]

[Process example]

“Construction or detection method in concrete or mortar frame construction” In the crack monitoring method by construction of the frame, the form 4 for forming the beam 3 of the spray concrete or the spray mortar during the construction of the frame 3 Inside, the copper wire (enamel coil) 6 is folded back in a U-shape on the lower layer 31 near the ground 1 and the upper layer 32 near the surface of the beam 3 while positioning the spray concrete or spray mortar. The beam 3 is formed by casting. In this case, by arranging a hard copper wire in a portion 31 corresponding to the lower layer of the beam 3 and a soft copper wire in a portion 32 corresponding to the upper layer, as shown in the upper and lower portions of FIG. There are two types of frame breakage: primary disconnection and secondary disconnection.
Detect in stages. That is, when an earthquake or other disaster such as a change in groundwater vein occurs, for example, as shown in FIG.
When the annealed copper wire in the portion corresponding to the upper layer is cut due to the collapsed state of the crack C or the like, but the hard copper wire in the portion corresponding to the lower layer is not cut (the upper portion of FIG. 7), and corresponds to the upper layer Even if the annealed copper wire of the part 32 is not cut, the hard copper wire of the part 31 corresponding to the lower layer is cut (FIG. 7).
Underneath) to understand the details of the damage. The above-mentioned copper wire 6 is set as a set of about two, and it is extended to a place where both terminals can be inspected for each copper wire, and at the position easy to inspect under the slope so that both terminals of the copper wire are aligned. The terminals are collectively stored in the terminal storage case 8 and the detection instrument 9 is installed at an appropriate place so that monitoring and inspection can be performed.

[0008]

[Specific installation example]

"When installing at the time of construction of slope frame work" Examine the installation site of slope 1 and determine the beam 3 to be installed by diagnosing the current situation (survey survey) Perform survey survey of slope 1 → paint on the installation site -Marking by etc. (positioning) → Forming of blowing frame, rebar assembler,
Perform conventional formwork installation work such as anchor work (formwork installation work) →
After spraying a spraying material such as mortar or concrete with a thickness of 2 to 3 cm on a portion of the slope 2 close to the slope 1, the copper wire 6 is wound around the hook 7 and the beam 3 is attached. It is installed in two reciprocating rows along the length direction (copper wire lining work at the portion corresponding to the lower layer). At the same time, install reinforcing bars 5 → Next, in the form 4, spray material is sprayed leaving 2 to 3 cm from the surface (spraying work) → After the spraying, at a position close to the surface of the beam 3 copper wire 6 is wound around the hook 7 and installed in two reciprocating rows along the length direction of the beam 3 (copper wire laying of the portion corresponding to the upper layer) → Subsequently, the copper wire 6 of the portion corresponding to the upper layer is Spraying the sprayed material from above (spraying work) → A copper wire end storage case 8 is attached to the lower part along the slope 1 to store the copper wire end. → Furthermore, the terminal of the copper wire 6 is pulled inside, a current of 8 to 12V is applied, and the detection device 9 of the outdoor control panel box with a stainless steel window for turning on the red lamp is used (of the detection device). Installation) → Completed. When the spray material is sprayed into the form 4, there is a slight time difference between the beams 3 when the spray molding of the method frame 2 is completed.
Is completely integrated without a fault in its thickness direction.

"Inspection method for concrete slope and mortar frame work" (1) Even after the crack monitor is installed, even if no wire breakage occurs, a check is periodically conducted by a tester (not shown). And manage. (2) If the generation of crack C is confirmed by the cutting of the copper wire 6, the installation location is precisely investigated. (3) In a place near the power source, the detection instrument 9 connected to the end of the copper wire 6 is equipped with an alarm lamp in advance, and the power is turned on when the copper wire 6 is disconnected.
Set to notify the disconnection by turning on the alarm lamp. (4) Inspections should be performed about four times a year due to seasonal changes. Also, immediately after the earthquake and before or after a typhoon will occur. (5) When an earthquake or other disaster occurs, for example, even if the annealed copper wire of the portion 32 corresponding to the upper layer is cut by the crack C of the method frame 2 as shown in FIG. 7, the hard copper wire of the portion 31 corresponding to the lower layer is cut. Is not cut (upper crack C in FIG. 7), and the hard copper wire of the part 31 corresponding to the lower layer is cut even if the soft copper wire of the part 32 corresponding to the upper layer is not cut (FIG. The degree of the damage state is judged by the lower crack C) of 7.

[0010]

Since the present invention has the above-mentioned structure, the crack monitor can be easily and securely attached. In addition, it is possible to conduct a detailed survey of the construction site during the installation process. Next, whether or not the copper wire used as the crack monitor is cut can be accurately and easily inspected with a relatively inexpensive instrument such as a tester. Then, depending on the cutting situation of the copper wire, locally inspect it precisely, and if it is judged that the degree of risk is high, re-copper the cutting wire and attach the detection tool connected to the end of the copper wire. Follow up can be done at. Further, when it is determined that the scale of the crack is large and the risk is further increased, a crack watcher using a pull switch can be attached separately.
Further, by arranging the hard copper wire in the portion corresponding to the lower layer of the beam and arranging the annealed copper wire in the portion corresponding to the upper layer, two-step detection of the primary disconnection and the secondary disconnection can be performed. That is, even if the annealed copper wire in the part corresponding to the upper layer of the beam is cut,
When the hard copper wire in the part corresponding to the lower layer is not cut,
Or, even if the annealed copper wire of the part corresponding to the upper layer is not cut, but the hard copper wire of the part corresponding to the lower layer is cut, the disaster may occur depending on the cutting or non-cutting state of the two types of strength and weakness copper wire. Since the contents of the status can be grasped, it is possible to take subsequent countermeasures.

[Brief description of drawings]

FIG. 1 is a front view of a concrete or mortar frame work installed on a slope frame equipped with a crack monitor.

FIG. 2 is a vertical sectional view of FIG.

3 is an enlarged side view of a portion of FIG.

FIG. 4 is a sectional view taken along line 4-4 of FIG.

FIG. 5 is a vertical cross-sectional view showing the molding process of FIG.

FIG. 6 is a vertical sectional view showing a molding process from FIG.

FIG. 7 is a vertical cross-sectional view showing a state of a copper wire when the method frame collapses.

[Explanation of symbols]

Slope of 1 ground 2 legal framework Beam of 3 legal frames 4 formwork 5 Reinforcing bar 6 copper wire 7 Hooks consisting of fixed nails 8 Copper wire terminal storage box Detecting device for 9 monitors

Claims (2)

(57) [Claims] 1. Annealed copper at a portion corresponding to an upper layer near a surface in a height direction in a single beam or several beams at the time of placing concrete or mortar for setting a slope on a slope of a natural ground. A wire is arranged, and a hard copper wire is arranged and stretched in a region corresponding to the lower layer close to the slope, and the copper wire is folded back at approximately the middle part of the entire length and installed so as to embed the reciprocating copper wire, And both ends of the copper wire are exposed to a detectable location and exposed, and the crack monitoring method in the legal frame characterized by detecting the occurrence of cracks in concrete or mortar by cutting the copper wire using this terminal. . 2. When a slope (2) is formed on the slope (1) by placing concrete or mortar, and when a constant impact is applied to the beam (3) at one or several places during the placing. Whether the copper wire (6) to be disconnected is wound around the hook (7), folded back in a U-turn shape, reciprocated and embedded, and installed by attaching the detection instrument (9) to the end of the copper wire A crack monitoring device in a legal framework, characterized in that it is configured to inspect