JP6398311B2 - Concrete inspection equipment - Google Patents

Description

  The present invention relates to a concrete inspection apparatus for inspecting the soundness of a concrete structure such as tunnel construction concrete.

  Conventionally, inspecting concrete structures such as tunnel construction concrete has been the mainstream sounding method that distinguishes the sound of hammering sound and judges its soundness. It was implemented tactically. In the case of the hitting method using human power, the distinction of hammering hits and echoes by human power depends on the experience and ability (hearing ability) of the observer. In addition, in a narrow space with dark dust, such as tunnels, it is a harsh operation, and particularly in the inspection of the tunnel arch part, the posture is upward and it is difficult to work for a long time.

  Therefore, various inspection methods that do not rely on human power are being studied. For example, a signal wave is transmitted from the transmitting device provided in the front part of the traveling carriage toward the subject surface such as a concrete floor slab, and the signal wave transmitted by the receiving apparatus provided in the rear part of the traveling carriage is received, A technique for inspecting the soundness of a concrete floor slab based on the waveform of a reception signal from a receiving apparatus has been proposed (see, for example, Patent Document 1). According to this technique, the soundness of the subject surface can be inspected while the traveling carriage is traveling, so that the inspection period and labor can be greatly reduced.

Japanese Patent Laid-Open No. 06-148147

  However, in order to receive a signal wave from the subject surface with the receiving device while the traveling carriage is traveling, the receiving device needs to be in constant contact with the subject surface. In this case, noise is input to the receiving apparatus due to sliding friction with the surface of the subject, and the inspection accuracy is lowered, and the contact surface with the surface of the subject in the receiving apparatus is worn out. Sex matters.

  This invention is made | formed in view of such a condition, The above-mentioned subject is eliminated, The concrete test | inspection with high durability which can test | inspect the soundness of a concrete structure with high inspection precision, making it drive | work. To provide an apparatus.

Concrete test device of the present invention is mounted on each of the two wheel sets in parallel, the rotating roller for rotating the wheel shaft and co in contact with the surface of the object, synchronization to synchronize the rotation of the wheel shaft of the two A mechanism, a transmission device attached to one of the wheel shafts and intermittently contacting the subject surface as the rotation roller rotates to transmit an elastic wave; and the other rotation shaft attached to the other wheel shaft. And a receiving device that receives an elastic wave in contact with the subject surface intermittently at the same timing as the transmitting device.
Furthermore, in the concrete inspection apparatus of the present invention, the interval between the two wheel shafts may be equal to or greater than the circumferential length of the rotating roller.
Furthermore, in the concrete inspection apparatus of the present invention, the distance between the two wheel shafts and the circumferential length of the rotating roller may be the same length.
Furthermore, in the concrete inspection apparatus of the present invention, one transmitting device may be attached to one of the wheel shafts, and a plurality of receiving devices may be attached to the other wheel shaft.
Furthermore, in the concrete inspection apparatus according to the present invention, the receiving device includes a contact portion formed with a curved contact surface with the subject surface, and the contact portion is in contact with the rotation of the rotating roller. The surface of the subject may be contacted while changing the angle.
Furthermore, in the concrete inspection apparatus of the present invention, the receiving device includes a biasing unit that biases the contact portion in a direction away from the wheel shaft, and the contact portion is biased by the biasing unit. And may be brought into contact with the surface of the subject.

  According to the present invention, since it is not necessary to keep the receiving device in contact with the surface of the subject at all times, the soundness of the concrete structure can be inspected with high inspection accuracy while running, and the durability is improved. There is an effect that can be.

It is a perspective view which shows the structure of embodiment of the concrete test | inspection apparatus which concerns on this invention. It is a schematic side view which shows the structure of the transmission device and receiving device which are shown in FIG. It is a bottom view which shows the example of arrangement | positioning of the transmitter and receiver shown in FIG. It is explanatory drawing for demonstrating the concrete test | inspection area | region by embodiment of the concrete test | inspection apparatus which concerns on this invention. It is a bottom view which shows the other example of arrangement | positioning of the receiver shown in FIG. It is a bottom view which shows the other example of arrangement | positioning of the receiver shown in FIG.

  Next, modes for carrying out the present invention (hereinafter, simply referred to as “embodiments”) will be specifically described with reference to the drawings.

  As shown in FIG. 1, the concrete inspection apparatus 10 of the present embodiment includes two parallel wheel shafts 1a and 1b, two rotating rollers 2a fixedly attached to the wheel shaft 1a, and a wheel shaft 1b. And three rotating rollers 2b mounted. The rotating roller 2a and the rotating roller 2b are rubber tires that rotate in contact with the surface of a concrete structure (hereinafter referred to as a specimen) such as tunnel construction concrete to be inspected. The rotating roller 2a and the rotating roller 2b have the same diameter, and the circumferential length, that is, the distance traveled by one rotation is the same.

  A transmitting device 3 is provided between the two rotating rollers 2a of the wheel shaft 1a. The transmitting device 3 is fixed to the side surface of the wheel shaft 1a or the rotating roller 2a, and intermittently contacts the subject surface as the rotating roller 2a rotates. That is, the transmission device 3 has a contact portion that comes into contact with the surface of the subject, and the contact portion is provided at one place on the outer periphery of the rotating roller 2a. Therefore, when the rotating roller 2a rotates once, the contact portion of the transmission device 3 comes into contact with the subject surface once.

  A receiving device 4 is provided adjacent to each of the three rotating rollers 2b mounted on the wheel shaft 1b. The three receiving devices 4 are fixed to the side surface of the wheel shaft 1b or the rotating roller 2b, and intermittently and simultaneously contact the subject surface as the rotating roller 2b rotates. That is, the receiving device 4 has a contact portion that comes into contact with the surface of the subject, like the transmitting device 3, and the contact portion is provided at one place on the outer periphery of the rotating roller 2b. Therefore, when the rotating roller 2b rotates once, the contact portion of the receiving device 4 contacts the subject surface once.

  The transmitting device 3 and the receiving device 4 have the same configuration. Referring to FIG. 2, the piezoelectric device 21 is provided in contact with the piezoelectric device 21 and functions as a contact portion that contacts the subject surface. And a protective member 22 to be used. Hereinafter, a more detailed configuration will be described based on the transmission device 3. The piezoelectric element 21 and the protection member 22 are provided so as to be movable in the normal direction of the wheel shaft 1a, and are urged in a direction away from the wheel shaft 1a by a spring 23 which is a biasing means. As shown in FIG. 2A, in a state where the transmitter 3 is not in contact with the subject surface, the subject surface and the contact surface of the protection member 22 protrude from the outer peripheral surface of the rotating roller 2a. As a result, as shown in FIG. 2B, when the transmitter 3 is in contact with the subject surface, the contact surface of the protection member 22 is in contact with the subject surface while being biased by the spring 23. In the present embodiment, since a rubber tire is used as the rotating roller 2a, in consideration of elastic deformation of the rubber tire, the contact surface of the protection member 22 is not in contact with the subject surface when the transmitter 3 is not in contact with the subject surface. It suffices if it is located near the peripheral surface of the rotating roller 2a. The subject surface and the contact surface of the protection member 22 are formed in a curved surface. As a result, the contact surface of the protection member 22 contacts the subject surface for a predetermined time while changing the contact position with the rotation of the rotating roller 2a. Furthermore, the spring 23 also functions as a damper that absorbs an impact when the protective member 22 regulates the subject surface with the rotation of the rotating roller 2a.

  As shown in FIG. 1, sprockets 5 are respectively attached to the wheel shaft 1 a and the wheel shaft 1 b, and a chain 6 such as a roller chain is spanned between the sprockets 5. The sprocket 5 and the chain 6 function as a synchronization mechanism that synchronizes the rotation of the rotating roller 2a and the rotation of the rotating roller 2b. The transmitting device 3 and the receiving device 4 are configured such that the contact surface of the protective member 22 in the receiving device 4 is also in contact with the subject surface at the timing when the contact surface of the protective member 22 in the transmitting device 3 is in contact with the subject surface. Are aligned. As a result, when the concrete inspection apparatus 10 is driven by the power of human power or an engine, the contact surface of the protection member 22 in the transmission device 3 and the protection member 22 in the reception device 4 are accompanied by the rotation of the rotation roller 2a and the rotation roller 2b. Intermittently contact the surface of the subject at the same timing.

  The concrete inspection apparatus 10 according to the present embodiment includes a pulse generator 30 that supplies a predetermined voltage signal to the transmission device 3 and a waveform recording device 40 that records the received waveform received by the reception device 4. . A rotary connector 7 is provided at one end of the wheel shaft 1 a, and a voltage signal output from the transmission device 3 is supplied to the transmission device 3 through the rotary connector 7. The voltage signal supplied from the transmission device 3 is input to the piezoelectric element 21 of the transmission device 3, and the piezoelectric element 21 vibrates. A voltage signal is constantly output from the transmission device 3, and when the contact surface of the protection member 22 in the transmission device 3 contacts the subject surface, the vibration of the piezoelectric element 21 is elastically applied to the subject surface via the protection member 22. It is transmitted as a wave.

  The elastic wave transmitted from the transmitter 3 to the subject surface is propagated as a surface acoustic wave. The surface acoustic wave is transmitted to the piezoelectric element 21 of the receiving device 4 through the protective member 22 and converted into a voltage signal. A rotary connector 7 is provided at one end of the wheel shaft 1b, and a voltage signal converted by the piezoelectric element 21 of the receiving device 4 is input as a received waveform to the waveform recording device 40 via the rotary connector 7 and recorded. Is done. By analyzing this recorded received waveform on the basis of the received waveform on the sound surface of a healthy object without damage such as cracks and cracks, the waveform shape and the maximum amplitude value are classified into several stages of patterns. , Can be linked to soundness assessment.

  When the object is an upper surface of a concrete floor slab or the like, the concrete inspection apparatus 10 can be pushed by human power or can be self-propelled by the power of an engine or the like as a traveling carriage. In addition, when the subject is a side surface or lower surface such as a tunnel wall surface, a human can hold the concrete inspection apparatus 10 in his / her hand and press it against the subject surface or move along the guide wall by the power of the engine or the like. It can be self-propelled.

  Referring to FIG. 2, the distance L between the wheel shaft 1a and the wheel shaft 1b is set to be equal to or greater than the circumferential length (diameter R * π) of the rotating roller 2a and the rotating roller 2b. Referring to FIG. 3, in the region between the wheel shaft 1a and the wheel shaft 1b, the region connecting the transmitting device 3 and the receiving device 4 becomes the inspection region X and exists in this inspection region X by analyzing the received waveform. It is possible to detect damage Y such as a crack or a crack. FIG. 3 shows a state where the contact surface of the protection member 22 in the transmission device 3 and the contact surface of the protection member 22 in the reception device 4 are in contact with the subject surface. Moreover, in this Embodiment, since the three receivers 4 are provided in the wheel shaft 1b, the soundness of the subject between the wheel shaft 1a and the wheel shaft 1b can be surface-inspected.

  When the concrete inspection apparatus 10 is driven by the power of human power or an engine, an elastic wave is transmitted from the transmission apparatus 3 every time the concrete inspection apparatus 10 advances by the circumference of the rotating roller 2a and the rotating roller 2b (diameter R * π). The inspection area X connecting the transmission device 3 and the reception device 4 can be inspected. Therefore, when the distance L between the wheel shaft 1a and the wheel shaft 1b is equal to the circumferential length (diameter R * π) of the rotating roller 2a and the rotating roller 2b, as shown in FIG. Simply traveling in the direction indicated by arrow A, the surface of the subject can be inspected uniformly and efficiently. FIG. 4B shows an inspection region X in the case where the distance L between the wheel shaft 1a and the wheel shaft 1b is set to be longer than the circumferential length (diameter R * π) of the rotating roller 2a and the rotating roller 2b. Yes. In this case, the examination regions X overlap and the efficiency is somewhat lowered, but the soundness of the subject can be examined more evenly.

  As shown in FIG. 5, the receiving device 4 may be attached to the wheel shaft 1 a similarly to the transmitting device 3. In FIG. 5, a rotating roller 2b is mounted on each side of two rotating rollers 2a, and a receiving device 4 is provided adjacent to each of the rotating rollers 2b. Also in this case, the receiving device 4 comes into contact with the subject surface at the same time as the transmitting device 3, and the area between the wheel shaft 1a and the wheel shaft 1b can be examined more planarly.

  Further, as shown in FIG. 6, a wheel shaft 1c that rotates in synchronization with the wheel shaft 1a may be provided between the wheel shaft 1a and the wheel shaft 1b, and the receiving device 4 may be attached to the wheel shaft 1c. In FIG. 6, two rotating rollers 2b are mounted on the wheel shaft 1c, and a receiving device 4 is provided adjacent to each of the rotating rollers 2b. Also in this case, the receiving device 4 comes into contact with the subject surface at the same time as the transmitting device 3, and the area between the wheel shaft 1a and the wheel shaft 1b can be examined more planarly.

As described above, according to the present embodiment, the rotating rollers 2a, 2b that are mounted on the two parallel wheel shafts 1a, 1b and rotate with the wheel shafts 1a, 1b in contact with the surface of the subject. A synchronizing mechanism (sprocket 5 and chain 6) that synchronizes the rotation of the two wheel shafts 1a and 1b, and one of the wheel shafts 1a are intermittently brought into contact with the surface of the subject as the rotating roller 2a rotates. A transmitting device 3 that transmits an elastic wave and a receiving device that is attached to the other wheel shaft 1b and receives the elastic wave by intermittently contacting the subject surface at the same timing as the transmitting device 3 as the rotating roller 2b rotates. 4 is provided.
With this configuration, it is not necessary to keep the transmitter 3 and the receiver 4 in contact with the surface of the subject at all times, so that the soundness of the concrete structure can be inspected with high inspection accuracy while the concrete inspection apparatus 10 is running. In addition, the durability can be improved.

Furthermore, in this Embodiment, the space | interval between the two wheel shafts 1a and 1b is set more than the perimeter of rotation roller 2a, 2b.
With this configuration, the health of the subject can be inspected evenly by simply running the concrete inspection apparatus 10.

Furthermore, in this Embodiment, the space | interval between the two wheel shafts 1a and 1b and the perimeter of rotation roller 2a, 2b are set to the same length.
With this configuration, the soundness of the subject can be efficiently inspected simply by running the concrete inspection apparatus 10.

Further, in the present embodiment, one transmitting device 3 is attached to one wheel shaft 1a, and a plurality of receiving devices 4 are attached to the other wheel shaft 1b.
With this configuration, it is possible to inspect the area between the two wheel shafts 1a and 1b.

Further, in the present embodiment, the receiving device 4 includes a protection member 22 as a contact portion in which a contact surface with the subject surface is formed as a curved surface, and the protection member 22 comes into contact with the rotation of the rotating roller 2b. The surface of the subject is contacted while changing the position.
With this configuration, only the rolling friction smaller than the sliding friction acts on the protection member 22, so that noise can be prevented and durability can be improved.

Furthermore, in the present embodiment, the receiving device 4 includes a spring 23 that is an urging unit that urges the protection member 22 in a direction away from the wheel shaft 1 b, and the protection member 22 is urged by the spring 23. Contact with the subject surface.
With this configuration, the protection member 22 can be brought into close contact with the subject surface, so that reception sensitivity can be improved.

  The transmitting device 3 has the same configuration as the receiving device 4. Accordingly, only the rolling friction smaller than the sliding friction acts on the protective member 22 of the transmission device 3, and the protective member 22 can be brought into close contact with the subject surface. Thereby, the durability of the transmitter 3 can be improved, and an accurate elastic wave can be transmitted to the subject surface.

The present invention has been described based on the embodiments. This embodiment is an exemplification, and it will be understood by those skilled in the art that various modifications can be made to combinations of these components, and that such modifications are within the scope of the present invention.
For example, although the sprocket 5 and the chain 6 are used as the synchronization mechanism in the present embodiment, a pulley, a toothed belt, or a gear can be used as the synchronization mechanism.
Further, the waveform recording device 40 is configured to record the reception waveform from the reception device 4, but a personal computer installed in another place is provided with a transmission unit that transmits the reception waveform from the reception device 4 wirelessly or by wire. You may make it transmit to analyzers, such as a computer.
Further, in the present embodiment, the voltage signal is always output from the transmitting device 3 and the piezoelectric element 21 of the transmitting device 3 is constantly vibrated. However, the piezoelectric element 21 of the transmitting device 3 or the receiving device 4 is used. The voltage signal may be output from the transmission device 3 for a predetermined time at a timing when the timing at which the protective member 22 contacts the subject surface is detected.

DESCRIPTION OF SYMBOLS 1a, 1b, 1c Wheel shaft 2a, 2b Rotating roller 3 Transmitter 4 Receiving device 5 Sprocket 6 Chain 7 Rotary connector 10 Concrete inspection device 21 Piezoelectric element 22 Protection member 23 Spring 30 Pulse generator 40 Waveform recording device

Claims (6)

Is mounted on each of the two wheel sets in parallel, the rotating roller for rotating the wheel shaft and co in contact with the surface of the object,
A synchronization mechanism for synchronizing the rotation of the two wheel shafts;
A transmitting device that is attached to one of the wheel shafts and intermittently contacts the subject surface as the rotating roller rotates, and transmits an elastic wave;
A receiving device that is attached to the other wheel shaft and that intermittently contacts the surface of the subject and receives elastic waves at the same timing as the transmitting device as the rotating roller rotates. Concrete inspection device.   The concrete inspection apparatus according to claim 1, wherein a distance between the two wheel shafts is equal to or greater than a circumferential length of the rotating roller.   The concrete inspection apparatus according to claim 2, wherein the distance between the two wheel shafts and the circumferential length of the rotating roller are the same. One transmitting device is attached to one of the wheel shafts,
4. The concrete inspection apparatus according to claim 1, wherein a plurality of the receiving devices are attached to the other wheel shaft. The receiving device includes a contact portion in which a contact surface with the subject surface is formed as a curved surface,
5. The concrete inspection apparatus according to claim 1, wherein the contact portion is brought into contact with the surface of the subject while changing a contact position with the rotation of the rotating roller. The receiving device includes biasing means for biasing the contact portion in a direction away from the wheel shaft,
6. The concrete inspection apparatus according to claim 5 , wherein the contact portion is brought into contact with the subject surface in a state of being biased by the biasing means.

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