JP5491005B2 - Nondestructive inspection method for filling state of gaps in connecting means - Google Patents

Description

    The present invention relates to a connecting means for connecting to-be-connected members such as a precast member, a connecting means capable of confirming non-destructively whether or not a gap is generated by filling the connecting means uniformly with a grout material. The present invention relates to a non-destructive inspection method for filling a void.

As shown in FIG. 5, the mortar-filled joint A used as a means for connecting the precast members to each other has the reinforcing bars B of the connected members to be connected arranged inside thereof, and then the inside of the joint A The reinforcing bars B are firmly connected to each other by being filled with a grout material C. At that time, as a means for confirming whether or not the grout material C is uniformly filled in the joint A and no gap is generated, it is visually confirmed that the grout material C is discharged from the outlet D or the pipe E, or FIG. As shown in FIG. 4, a stopper F that closes the exposed end of the pipe E attached to the opening of the outlet D of the grout material C is used. In the case of the stopcock F, a through hole G is formed at the center in the longitudinal direction of the plug body that closes the opening of the pipe E, and the through hole G has such a length that the string H can slide freely. Is inserted. The string H is provided with a flat circular disc I substantially the same as the inner outer shape of the stopper F on the inner side of the stopper F, and the string H on the outer side of the stopper F on the other side. The bulging portion J is formed by, for example, tying the string H so as not to fall out of the through hole G.

    A stopper F having the above structure is attached to the opening of the pipe E with the circular disk I side protruding inward, and then the grout material C is separately injected into the joint A from the grout material inlet K. Thus, the grout material C is filled into the grout material discharge port D and the pipe E side while filling the space between the inner walls of the reinforcing bar B and the joint A, and presses the protruding circular disk I from the inside, As a result, the bulging portion J side of the string H is pushed outward and protrudes.

    By visually observing the protrusion, it was confirmed that the grout material C was filled in the joint A.

    Further, as another means for connecting the connected members to each other, the grout material injected from one end side into the gap of the mortar filling joint disposed at the connecting position end portion of the connected members is the other end side. It was assumed that the voids were uniformly filled with the grout material by confirming that the air was discharged from the air.

On the other hand, as a means for confirming the connection state of the connecting means with the grout material, a method of performing a radiation transmission test or the like on the portion after filling the grout material is also considered as a nondestructive inspection method.
JP 7-248317 A JP 2000-258401 A

    The above-mentioned inspection method for visually confirming the discharge of the grout material is insufficient for confirming the discharge, or the inspection method for visually confirming the protrusion of the string H is forgetting to push the string H inward, or something such as vibration It is also conceivable that the string H protrudes outward before the grout material C is filled into the joint A due to the impact. Moreover, since it is conceivable that only the pipe E is filled with the grout material, it is necessary to inspect all the parts at the time of construction, and the inspection takes time.

    On the other hand, in the inspection method using radiation, for example, when reinforcing bars are overlapped like columnar bars, it is impossible to check the filling condition of the grout material for each joint unit. In addition, since radiation will be used, exposure to radiation must be taken into account, and there is a danger, and it is the best that can be used in places where inspection environment management is difficult, such as construction sites for construction civil engineering. It was not a thing.

    The present invention solves the above-mentioned drawbacks, and it is possible to confirm whether or not the grout material is completely filled in each connecting means at the time of construction or only has a method of partially inspecting after construction. The present invention provides a nondestructive inspection method capable of inspecting the filling state safely and reliably using ultrasonic waves later.

In the method of inspecting the filling state of the grout material filled in the gap of the connecting means for connecting the connected members to each other,
1. The connected member is disposed in the gap of the connecting means so that the ends of the connected member face each other from both ends thereof.
2. Filling the gap of the connecting means with the grout material as appropriate from the grout material inlet formed on one end side of the connecting means,
3. The grouting material is filled , and the grouting material is filled into the extended discharge cylinder protrudingly attached to the grouting material discharge port formed on the other end side, and the grouting material is discharged from the extended discharging cylinder. Finish filling at the time,
4). In a state where the grout material filled in the gap of the connecting means and in the extended discharge cylinder is solidified, a probe is brought into contact with the exposed end surface of the extended discharge cylinder.
5. The ultrasonic wave from the probe connected to the ultrasonic flaw detector is transmitted to the grout material filled and solidified in the extension discharge tube, and the state of the reflected wave is measured by the ultrasonic flaw detector, Check for the presence and state of voids,
It is characterized by a non-destructive inspection method for the filling state of the gap of the connecting means.

Further, in the method of inspecting the filling state of the grout material filled in the gap of the connecting means for connecting the connected members to each other,
1. The connected member is disposed in the gap of the connecting means so that the ends of the connected member face each other from both ends thereof.
2. Fill the gap of the connecting means with a grout material as appropriate from the grout material injection port formed on one end side of the connecting means.
3. The grouting material is filled, and the grouting material is filled into the extended discharge cylinder protrudingly attached to the grouting material discharge port formed on the other end side, and the grouting material is discharged from the extended discharging cylinder. Finish filling at the time,
4). With the grout material filled in the gap of the connecting means and in the extended discharge tube solidified, the probe is brought into contact with the surface of the protruding inlet,
5. The ultrasonic wave from the probe connected to the ultrasonic flaw detector is transmitted to the grout material filled and solidified in the projecting injection port , the state of the reflected wave is measured by the ultrasonic flaw detector, Check for the presence and state of voids,
It is characterized by a non-destructive inspection method for the filling state of the gap of the connecting means.

Further, the present invention is characterized by a non-destructive inspection method for a filling state of a gap of the connecting means in which the connecting means is a mortar-filled cylindrical joint .

Further, the present invention is characterized by a non-destructive inspection method for a filling state of a gap of a connecting means in which the connecting means is disposed at a connecting position end of a connected member such as a precast member .

    The present invention makes it possible to inspect the filling state of the grout material filled in the gap of the connecting means for connecting the connected members such as the precast member with a simple and non-destructive means at a low cost and reliably and safely. became.

  In addition, since the grout material is solidified, the probe is brought into contact with the surface on the grout material outlet side and the rebound state by ultrasonic waves is inspected to confirm the unfilled portion that becomes a void. The inspection could be completed in about 3 minutes, making it an extremely effective inspection means.

  Furthermore, it is possible to easily and surely confirm the gap that becomes the unfilled portion without performing any special work prior to filling the connecting means with the grout material.

    DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on examples shown in the drawings.

    FIG. 1 is a cross-sectional view showing a state in which a grout material 3 (hereinafter, fillers such as mortar are collectively referred to as a grout material) so as to embed a reinforcing bar 2 disposed in a mortar filling joint 1. . In order to connect the longitudinal reinforcing bars 2 to each other, a gap 6 of the connecting means is provided, and the grout material 3 is filled from the grout material injection port 4 formed at the lower end of the mortar filling joint 1, and the filled grout material 3 shows a state where the grout material discharge port 5 formed at the upper end of the joint 1 is raised to the vicinity. Hereinafter, it demonstrates along the Example at the time of using the mortar filling joint 1 in the vertical direction.

    Since the grout material 3 is rich in fluidity, the grout material 3 filled from the grout material injection port 4 does not cause air accumulation in the gap 6 which is an intermediate portion of the joint, and is shown in FIG. It surely rises up to the vicinity of the grout outlet 5.

    There are several possible causes of air accumulation in the mortar filling joint 1, and the main reason is that the grout material 3 sinks after the grout material 3 is completely filled and then solidified, or It is conceivable that the outlet is closed with the grout material in a state where the grout material 3 is not sufficiently filled. In any case, an air pool is generated in the vicinity of the upper end portion of the mortar filling joint 1, so by checking the state of filling of the grout material 3 in the vicinity of the grout material discharge port 5, It is possible to obtain confirmation that the filling of the grout material has been performed uniformly.

    FIG. 2 is an enlarged view of the upper end portion of FIG. 1 and shows a filling inspection of the grout material at that portion. A protrusion 7 such as a flange is formed at the discharge port 5 of the mortar filling joint 1, and an extended discharge cylinder 8 is attached so as to be fitted to the protrusion 7. Therefore, the grout material 3 filled from the injection port 4 fills the gap in the mortar filling joint 1, discharges from the discharge port 5, and further fills the gap in the extended discharge cylinder 8 and is discharged. Become. By confirming the discharge of the grout material from the discharge port 5 and the extended discharge cylinder 8, the filling of the grout material into the mortar filling joint 1 is completed.

    The extended discharge cylinder 8 has a diameter that can be fitted to discharge ports of various mortar filling joints, and an appropriate length can be used, but 50 mm to 150 mm is optimal. In addition, since ultrasonic waves are transmitted as the inspection means, it is preferable to use a material other than the grout material such as concrete or similar material such as vinyl chloride so as not to affect it.

    After the filling of the grout material 3, the grout materials 3 and 9 are solidified in the extended discharge tube 8. After the grout material 9 is solidified, a contact catalyst material or the like for propagating ultrasonic waves to the exposed grout material surface 10 of the extended discharge tube 8 is applied. As the contact catalyst material, glycerin paste or the like is employed.

    The probe 11 is brought into contact with the contact catalyst material, and ultrasonic waves are transmitted. The probe 11 is a transmission / reception probe, and is used to transmit ultrasonic waves and receive the transmitted ultrasonic waves as ultrasonic echoes. When the inner diameter of the extended discharge tube 8 is about 22 mm, the probe 11 has a diameter of about 12.5 mm in order to propagate ultrasonic waves from the extended discharge tube 8. As schematically shown in FIG. 3, the probe 11 is connected to an ultrasonic flaw detector 12, and ultrasonic waves are transmitted into the solidified grout material 9 in the extended discharge tube 8. The ultrasonic wave having a wide band strength of, for example, 0.5 to 1.5 MHz is used to inspect various air gap conditions.

    The ultrasonic wave transmitted from the probe 11 propagates through the solidified grout material 9 in the extension discharge tube 8, propagates into the mortar filling joint 1, and is reflected as a reflected wave to the probe 11 as a receiving means. Since it bounces, the filling state of the grout material 3 in the mortar filling joint can be confirmed by measuring the strength of the bounce.

    If the grout material 3 in the mortar filling joint 1 is uniformly filled in the mortar filling joint 1 and no voids are generated, the ultrasonic wave transmitted from the probe 11 is transmitted through the grout material 3 in the mortar filling joint 1. , And is weakly reflected and weakened by the rebar 2 or the like, and the intensity of the reflected wave echo that the probe 11 can detect as reception becomes small. On the other hand, when the air gap S exists, most of the ultrasonic wave transmitted from the probe 11 is reflected at the boundary between the grout material 3 and the air layer forming the air gap S, and the reflected wave echo is strong. It is detected as reception to the probe 11.

    As shown in FIG. 2, when a gap S that is an unfilled portion of the grout material 3 is generated near the upper end portion of the mortar filling joint 1, the ultrasonic wave transmitted from the probe 11 is shown in FIG. 4. As shown in the state of T shown in the reflection waveform graph, a strong signal is returned to the probe 11. By converting the time of propagation and rebounding in the solidified mortar into distance, it is possible to confirm the presence and position of the unfilled portion that has become a void.

    After the unfilled portion is confirmed, a hole for confirmation is drilled in the extended discharge cylinder 8, the internal state of the mortar filling joint 1 is investigated with a fiberscope or the like, and the grout material is filled into the gap portion. And so on.

    In the said Example, although demonstrated along the case where the mortar filling joint 1 was used for the vertical direction, it is naturally possible to use it for the diagonal direction or the horizontal direction. When used in the horizontal direction, there is a possibility that a void that becomes an unfilled portion may occur on the inlet side for the same reason as described above. In consideration of this, the filling side of the inlet side is also inspected for the filling state of the grout material by the same method as described above, and the presence or absence of voids and the state thereof are confirmed. In this case, both the extended discharge tube and the injection port are to be inspected.

Sectional drawing which shows the state which filled the grout material in the mortar filling joint. The expanded sectional view of the grout material discharge part of a mortar filling joint. Schematic which shows an ultrasonic flaw detector and a probe. The example graph of the reflected waveform obtained by the filling state nondestructive inspection of the mortar filling joint. Sectional drawing which used a stopper as a filling state nondestructive inspection method of the conventional mortar filling joint. (A) Central cross-sectional view before use of stopcock, (b) Central cross-sectional view in a state where the stopcock is pushed by the grout material.

Explanation of symbols

1 Mortar filling joint
2 Rebar
3 Grout wood
4 Grout injection port
5 Grout material outlet
6 gap
7 Protrusion
8 Extended discharge tube 9
Grout
10 Grout material surface
11 Probe 12 Ultrasonic flaw detector

Claims (4)

In the method of inspecting the filling state of the grout material filled in the gap of the connecting means for connecting the connected members to each other,
1. The connected member is disposed in the gap of the connecting means so that the ends of the connected member face each other from both ends thereof.
2. Filling the gap of the connecting means with the grout material as appropriate from the grout material inlet formed on one end side of the connecting means,
3. The grouting material is filled, and the grouting material is filled into the extended discharge cylinder protrudingly attached to the grouting material discharge port formed on the other end side, and the grouting material is discharged from the extended discharging cylinder. Finish filling at the time,
4). In a state where the grout material filled in the gap of the connecting means and in the extended discharge cylinder is solidified, a probe is brought into contact with the exposed end surface of the extended discharge cylinder.
5. The ultrasonic wave from the probe connected to the ultrasonic flaw detector is transmitted to the grout material filled and solidified in the extension discharge tube, and the state of the reflected wave is measured by the ultrasonic flaw detector, Check for the presence and state of voids,
A non-destructive inspection method for the filling state of the gap of the connecting means. In the method of inspecting the filling state of the grout material filled in the gap of the connecting means for connecting the connected members to each other,
1. The connected member is disposed in the gap of the connecting means so that the ends of the connected member face each other from both ends thereof.
2. Fill the gap of the connecting means with a grout material as appropriate from the grout material injection port formed on one end side of the connecting means.
3. The grouting material is filled, and the grouting material is filled into the extended discharge cylinder protrudingly attached to the grouting material discharge port formed on the other end side, and the grouting material is discharged from the extended discharging cylinder. Finish filling at the time,
4). With the grout material filled in the gap of the connecting means and in the extended discharge tube solidified, the probe is brought into contact with the surface of the protruding inlet,
5. The ultrasonic wave from the probe connected to the ultrasonic flaw detector is transmitted to the grout material filled and solidified in the projecting injection port , the state of the reflected wave is measured by the ultrasonic flaw detector, Check for the presence and state of voids,
A non-destructive inspection method for the filling state of the gap of the connecting means.   The non-destructive inspection method for the filling state of the gap of the connecting means according to claim 1 or 2, wherein the connecting means is a mortar-filled cylindrical joint.   4. The non-destructive inspection method for the filling state of the gap of the connecting means according to any one of claims 1 to 3, wherein the connecting means is disposed at a connecting position end of a connected member such as a precast member.

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