JPH0330462Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a new rock collapse inspection device, which is installed on the top of a shield excavator used for constructing tunnels, etc. The present invention relates to a rock collapse inspection device that uses an ultrasonic probe to inspect the collapse state of the rock above the rock.

[Conventional technology]

Generally, a shield tunneling machine has a configuration as shown in FIG. As shown in the figure, the main body of the shield tunneling machine 1 is formed of a cylindrical shield frame 3, and a cutter face plate 20 is rotatably provided at the tip of the shield frame 3. Further, a cutter chamber 21 is formed within the shield frame 3, and connected to the cutter chamber 21 are a mud feeding pipe 22A for supplying muddy water and a mud draining pipe 22B for discharging muddy water mixed with earth and sand. Therefore, in constructing a tunnel, the cutter face plate 20 of the shield excavator 1 excavates underground, the excavated earth and sand are taken into the cutter chamber 21, and the segments 23 are stretched in the trench hole formed at the rear of the shield frame 3. It is being done.
By the way, when the shield excavator 1 excavates underground, there is a risk that the ground 4 above the shield frame 3 will collapse, so the ground collapse inspection device 2 is used to inspect the collapse situation. We need to move on. This rock collapse inspection device 2
is attached above inside the shield frame 3 of the shield tunneling machine 1.

Conventionally, the above-mentioned rock collapse inspection device 2 has been configured as shown in FIG. 3. As shown,
The shield frame 3 is provided with a container 19 that is open from the shield frame 3 toward the earth 4 side. An ultrasonic probe 5 is fixedly attached to the center of the bottom of the container 19 with the oscillating unit 6 facing the ground 4 side, and the ultrasonic probe 5 has an ultrasonic measuring device 24 and It is connected to a recording device 25 that records the measured values. Further, a water supply port 26 is provided at one end of the bottom of the container 19 and is connected to the water pump 14 . This water is used to clean the earth and sand when it accumulates on the oscillating part 6 of the probe 5, and also to clean the earth
This is to create a clear water atmosphere between the probe 5 and the probe 5 in which ultrasonic waves are less attenuated. That is, in the conventional apparatus, a fluid-like ultrasonic transmitting member such as water was interposed between the probe 5 and the ground 4 during inspection.

[Problem that the invention attempts to solve]

By the way, the conventional rock collapse inspection device 2 has the following problems.

Since the ultrasonic probe 5 is fixedly attached to the center of the bottom of the container 19 provided inside the shield frame 3, there is always an empty space 27 between the ground 4 and the probe 5. is formed. When inspections were not conducted, water was not being supplied to the area (27), which caused the problem of landslides. Also, during the ground collapse inspection, water is supplied to the above-mentioned space 27 by the water pump 14, but since there is no way for the water to escape, the water pressure fluctuates, causing the ground 4 to collapse instead. There was a problem.

[Purpose of invention]

The present invention was devised to effectively solve these problems in the rock collapse inspection device.

The purpose of this invention is to eliminate the air gap that occurs between the ultrasonic probe and the ground side during non-inspection, and to prevent ground collapse from pressure fluctuations in the ground and the drawing of earth and sand into the excavation machine side. Provide inspection equipment.

The next object of the present invention is to provide a rock side collapse inspection device that lowers the ultrasonic probe by a dead zone due to noise during inspection so that the inspection range can be extended from the surface of the shield frame.

Another object of the present invention is to provide a rock collapse inspection device that can prevent direct contact between an ultrasonic probe and the ground, prevent the adhesion of earth and sand, and enhance the protection of the contactor.

Furthermore, another purpose of the present invention is to enable the ultrasonic probe to be moved forward and backward from the ground side, and to perform rock collapse inspection in which the distance between the probe and the ground can be arbitrarily set during the inspection. Provide equipment.

Still another object of the present invention is to provide a rock collapse inspection device that can effectively clean the rock side of an ultrasonic probe.

[Summary of the idea]

In order to achieve the above object, the present invention has an ultrasonic probe that faces the ground side from within the shield frame, and oscillates ultrasonic waves from this probe toward the ground side to detect the collapse of the ground. In the mountain collapse inspection device, a probe is provided to be movable forward and backward from within the shield frame toward the rock mass side, and has an ultrasonic transmitting member at its tip facing the rock rock side; a cylinder chamber that is opened facing the ground and guides the probe; and a cylinder chamber that retreats the ultrasonic probe inside the shield frame during a rock collapse inspection, and that allows the ultrasonic transmitting member to come into contact with the ground when not inspecting. and a water supply means for supplying water between the earth and the ultrasonic transmitting member when the probe is retreated. The ultrasonic probe is provided on the ground side so that it can move forward and backward, and an ultrasonic transmitting member is provided on the ground side of the ultrasonic probe, so that the ultrasonic probe can be moved when not inspecting. Move the ultrasonic transmissive member forward toward the ground and bring it into contact with the ground to remove the space between the ground and the ultrasonic probe.
In addition to preventing dirt from being drawn into the excavator side, during inspections, the ultrasonic probe including the ultrasonic transmitting member can be moved back and the distance between it and the ground can be arbitrarily set during the inspection. In addition, during this inspection, water can be circulated and supplied between the ground and the ultrasonic transmitting member by the water supply means to clean the ground side of the ultrasonic probe and prevent water pressure fluctuations from occurring. It is.

〔Example〕

Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, an opening 2 is provided in the upper part of the shield frame 3 of the shield excavator 1 and is open toward the earth 4 side. An ultrasonic probe 5 having an ultrasonic transmissive member 7 facing the ground 4 at its tip is provided in the opening 2 so as to be movable forward and backward. The ultrasonic transmitting member 7 is formed of an ultrasonic transmitting member 7 made of acrylic resin or the like into a piston shape such as a cylinder, and the ultrasonic probe 5 is attached to the opposite side of the rock 4 side. Further, an outer cylinder 8 is provided on the outer periphery of the ultrasonic probe 5 including the piston-shaped ultrasonic transmitting member 7. The lower end of this outer cylinder 8 extends downward to cover the probe 5, and its lower part is closed by a cover plate 6. Therefore, the ultrasonic probe 5 has an ultrasonic transmitting member 7.
It is supported in a hollow chamber 10 defined by an outer cylinder 8 and a cover plate 6. The ultrasonic transmitting member 7 and the ultrasonic probe 5 are covered with a cylindrical outer tube 8 and have a piston shape as a whole. A probe moving means 11 for moving the member 7 forward and backward is connected. This probe moving means 11 is mainly composed of a slide jack 17, one end of which is attached to a support frame 19 provided within the shield frame 3, and the other end is attached to a joint member 38. It is attached to the cover plate 6 via the cover plate 6. Therefore,
The probe 5 including the piston-shaped ultrasonic transmitting member 7 is configured to move forward or backward toward the ground 4 by the expansion and contraction of the slide jack 17.
The probe 5 including the piston-shaped ultrasound transmitting member 7 is inserted into the opening 2 as shown in FIGS. 1 and 2.
It is fitted into a cylindrical cylinder chamber 9 hanging from the shield frame 3 side so as to slide forward and backward. A cylindrical chamber chamber 18 whose diameter is enlarged along the longitudinal direction is formed in the inner peripheral portion of the cylinder chamber 9 . On the other hand, a piston 30 extending radially outward is provided on the outer periphery of the outer cylinder 8 that defines the outer periphery of the probe 5 including the piston-shaped ultrasonic transmitting member 7 . Further, in the lower part of the chamber chamber 18, there is a space 12 formed between the ground 4 and the ultrasonic transmissive member 7 when the probe 5 including the ultrasonic transmissive member 7 is retreated. A passage 31 constituting a water supply means 15, which will be described later, is connected thereto. Therefore, as the piston-shaped probe 5 slides within the cylinder chamber 9 to retreat inward to the shield excavator 1, the piston 30 follows and moves inside the chamber chamber 18. At the same time, the piston-shaped probe 5 moves forward toward the ground 4, thereby transferring the water present in the chamber 12 into the chamber 1.
It is configured to collect or supply water within the tank.

A seal ring 32 is provided on the outer periphery of the piston 30 as shown in FIG. 2, and is configured to appropriately supply and drain water in the chamber 18 following the reciprocating movement of the piston 30. has been done.

Further, as shown in FIG. 1, when the ultrasonic probe 5 including the piston-shaped ultrasonic transmissive member 7 retreats toward the excavator 1, the ultrasonic probe 5 is formed between the ultrasonic transmissive member 7 and the ground 4. A water supply means 15 is provided for supplying circulating water into the space or space 12. This water supply means 15 mainly connects the water supply tank 13 and a water supply pipe 33 that supplies fresh water or muddy water from the water supply tank 13 to the empty part 12, and the empty part 12 and the water supply tank 13. The drain pipe 16 returns the water to the water supply tank 13, and the circulating water pipe 34 forms a passage 31 connecting the chamber chamber 18 and the empty space 12. A pump 14 is provided in the water supply pipe 33, and the water supply tank 13
Fresh water or muddy water pressurized to a predetermined pressure from the empty part 1
It is configured to be supplied within 2. The circulating water pipe 34 is connected to the water supply pipe 33, and an on-off valve 35 is provided on the upstream side of the water supply pipe 33. By closing the on-off valve 35, the water supply pipe 33 is shut off, and the chamber chamber 18 and the empty space are separated. A circulation passage 34 is formed to connect the chamber 12 to the chamber 12, and the water in the chamber 18 is transferred into the cavity 12 when the piston 30 retreats. on the other hand,
The drain pipe 16 is provided with an on-off valve 36, and when the on-off valve 36 is opened, the water from the cavity 12 is drained or returned to the water tank 13, and the drain pipe 16 is used for cleaning. A circuit 37 is formed.

Further, the volume of the chamber chamber 18 is equal to the volume of the empty space 12 formed between the ground mass 4 and the ultrasonic transmitting member 7.
When the piston-shaped ultrasonic probe 5 moves forward toward the ground 4, all the water in the empty space 12 flows into the chamber 18.
The water in the chamber chamber 18 is collected in the chamber 18, and when the probe 5 is retracted, the water in the chamber chamber 18 is sequentially transferred to the empty space 12.

Note that the height h of the hollow portion 12 formed between the earth 4 and the ultrasonic transmitting member 7 is set by a dead zone due to noise of the ultrasonic probe.

The ultrasonic probe 5 also includes an ultrasonic measurement device 24.
and a recording device 25 for recording the measured values. This ultrasonic measuring device 24 is configured to display the detection signal or ultrasonic echo transmitted from the probe 5 on a cathode ray tube.

Next, the operation of the present invention will be described.

First, during an inspection, as shown in FIG. The child 5 is moved backward to the inside of the shield excavator 1 to form a predetermined empty space 12 between the earth 4 and the ultrasonic transmitting member 7, and at the same time, it is collected by the piston 30 from within the chamber chamber 18. After the water is transferred to the air space 12, ultrasonic waves are emitted from the probe 5 toward the ground 4 to investigate the collapse state of the ground.

In addition, if there is dirt adhering to the ultrasonic transmitting member 7, the on-off valve 36 of the drain pipe 16 forming the cleaning circuit 37 is turned off while supplying clean water etc. from the water supply pipe 33 to the hollow part 12. When opened, dirt and the like are collected from the empty space 12 into the water supply tank 13, and the surface of the ultrasonic transmitting member 7 on the ground 4 side is cleaned, thereby allowing accurate inspection. The water supply tank 13 is filled with water or muddy water that has been used to clean the earth and sand deposited on the ultrasonic transmitting member 7.
Since the soil is collected in a timely manner, pressure fluctuations in the ground 4 can be effectively prevented.

Next, when such an ultrasonic inspection is completed, that is, when not inspecting, the slide jack 17 as the moving means 11 is advanced to advance the ultrasonic probe 5 toward the ground 4. An ultrasonic transmitting member 7 made of acrylic resin or the like contacts the ground 4 and closes the opening 2 of the shield frame 3.

In particular, by the moving means 11, the ultrasonic transmitting member 7
are pressed together to prevent the collapse of the earth 4 toward the excavator 1 side, and also to support the earth 4. At the same time, as the piston 30 moves forward, the water that has entered the cavity 12 is sucked into the chamber 18 and is collected and stored.

[Effect of idea]

In summary, the present invention provides the following excellent effects.

(1) There is a detection dead zone near the ultrasonic oscillation part of the ultrasonic probe where noise is generated and measurement is impossible. Energy attenuation in the section can be suppressed to a minimum.

(2) The ultrasonic probe and the ultrasonic transmitting member are provided so as to be able to move forward and backward from within the shield frame toward the ground, and when not inspecting, the upper surfaces of the shield frame and the ultrasonic transmitting member are Since it is installed flush, there is no accumulation of earth and sand on the probe surface, and when it is difficult to distinguish the echoes of the ground with the ultrasonic measuring device, the ultrasonic probe can be adjusted to move forward or backward. By doing this, the echoes of the ground can be very easily distinguished and deciphered.

(3) By retracting the ultrasonic probe into the shield frame during inspection, it is not affected by the dead zone caused by the noise of the ultrasonic probe.
Inspection is possible from the surface of the shield frame.

(4) The space between the ground and the ultrasonic transmitting member formed by moving the ultrasonic probe and the ultrasonic transmitting member backward from the shield frame towards the ground during inspection.
By providing a means for automatically supplying the same amount of water as the hollow part to the hollow part, it is possible to prevent fluctuations in water pressure to the ground and the drawing of earth and sand into the hollow part.

(5) Since the volume of sediment on the ultrasonic probe surface impairs the measurement accuracy of ultrasonic echoes, a water pump is used to send a stream of water to clean the probe surface, but a cleaning pipe returns the water to the sealed water tank. By providing an escape route for water flow, it is possible to prevent the effects of water pressure fluctuations on the ground.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing an embodiment of the present invention, Fig. 2 is a partially enlarged side sectional view of Fig. 1, Fig. 3 is a side sectional view showing a conventional example, and Fig. 4 is a side sectional view of a shield tunneling machine. FIG. In the figure, 1 is a shield excavator, 3 is a shield frame, 4 is a ground, 5 is an ultrasonic probe, 7 is an ultrasonic transmitting member, 9 is a cylinder chamber, 11 is a probe moving means, and 12 is an empty space. 15 is a water supply means, 16 is a drain pipe, and 18 is a chamber room.

Claims (1)

[Scope of utility model registration request] In a rock collapse inspection device that detects rock collapse by placing an ultrasonic probe facing the ground side from inside the shield frame and emitting ultrasonic waves from this probe toward the rock side, an ultrasonic probe that is movable forward and backward on the ground side and has an ultrasonic transmissive member facing the ground side at its tip; A cylinder chamber for guiding the probe, and a cylinder chamber for retracting the ultrasonic probe to the inside of the shield frame during a rock collapse inspection, and moving the ultrasonic transmissive member forward to contact the rock and close the rock side during a non-inspection. and a water supply means for circulating and supplying water between the rock and the ultrasonic transmitting member when the probe is retreated. Inspection equipment.