JPH0972832A - Sampling-type deposition thickness measuring apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a sampling-type deposition thickness measuring apparatus by which the deposition thickness of slime deposited inside a stabilization liquid after an excavating operation is measured when an excavation groove is filled with the stabilization liquid in the construction of an underground continuous wall. SOLUTION: A sampling-type deposition thickness measuring apparatus 1 is composed of a tube body 2 and of a graduated tape 3 by which the tube body 2 can be pulled up. The tube body 2 is composed of a stainless steel outer tube 4 and of a transparent resin inner tube 5. An opening part 4a is formed on the side faceof the outer tube 4. It is possible to see through the inside of the tube body 2 via the transparent inner tube 5 from the opening part 4a. A graduation 5a is marked on a part which is exposed in the opening part 4a at the inner tube 5. A valve 6 is installed at the upper part of the tube body 2. The valve 6 is opened when the tube body 2 is lowered into the water, and it is closed when the tube body 2 is pulled up. When the tube body 2 is lowered into a stabilization liquid, it is stuck to slime, amd it samples deposited slime. Then, the thickness of the slime which has been sampled inside the tube body 2 is read out from the graduation 5a at the opening part 4a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sampling type deposit thickness measuring instrument for measuring the thickness of deposits deposited in water.

[0002]

2. Description of the Related Art Generally, there is known an underground continuous wall constructed in the ground by excavating the ground in a groove shape and placing concrete in the groove. The underground continuous wall has been used as a temporary earth retaining wall, but in recent years, a method of using the underground continuous wall as a part of the main body of an underground structure has also been developed. In the underground continuous wall construction method, for example, when excavating in a groove shape, in order to prevent collapse of the wall surface of the excavation groove, excavation is performed while the excavation groove is filled with a stabilizing solution, and the excavated groove A method of constructing a continuous wall body in the ground by inserting a rebar cage inside and pouring concrete is used.

As the above-mentioned stabilizing solution, for example, one containing bentonite as its main component is used.
In the construction of the above-mentioned underground continuous wall, a part of the excavated earth and sand together with the bentonite etc. is contained in the stabilizing liquid in the excavated groove, and these earth and sand etc. will be deposited in the groove, It is necessary to remove these earth and sand before pouring concrete.

The deposits made of the earth and sand in the stabilizing solution are so-called slimes made of bentonite particles and soil particles contained in the stabilizing solution as described above, and are soft like sludge. In addition, when removing the accumulated slime, a part of it is suspended in the stabilizing solution, and it is difficult to completely remove it, so when the amount of slime to be deposited (deposition thickness) falls below a predetermined level, It is supposed to place concrete.

Therefore, in constructing a continuous underground wall, it was necessary to measure the deposition thickness of slime deposited in a trench that was excavated and filled with a stabilizing solution. Conventionally, for example, the following method has been used as a method for measuring the deposition thickness of such a bottom sediment in water.

In the first method, first, immediately after excavation or immediately after deposit removal, the measurer lowers the scale-equipped measuring tape having a weight at the tip into the groove, and the weight is moved to the bottom of the groove. The depth at the time of contact with, that is, the depth of the groove before the sediment was deposited was read from the measuring tape, and then, after the sediment was deposited for a predetermined time, the weight was again attached. Slowly lower the measuring tape into the groove and read the depth when the tip of the weight comes into contact with the surface of the sediment from the measuring tape to determine the depth before sediment and the depth after sediment etc. The deposit thickness is obtained from the difference between.

In the second method, a sensor capable of detecting the difference in electric conductivity between the stabilizing solution and the deposit is used as an interface meter, and a measuring tape with a scale is attached to the sensor, the same as the weight. The sensor is placed in the groove and the depth of the upper surface of the deposit is read from the measuring tape when the electric conductivity changes.

In the above sensor, for example, the range of electric conductivity of the stabilizing liquid is set in advance, and the range where the electric conductivity is set by the sensor descending in the groove coming into contact with the deposit When the temperature exceeds the limit, a buzzer on the ground side informs the measurer of the contact with the deposit. The measurer reads the depth at the time when it is notified by a buzzer or the like from the measuring tape.

The third method is to immerse dozens of chemical graduated cylinders immediately after excavation or immediately after removing deposits, and pulling up the chemical graduated cylinders one by one each time a predetermined time elapses. By measuring the amount of the deposit, the deposit thickness per unit time is obtained.

[0010]

By the way, in the first method, the change transmitted from the measuring tape when the weight contacts the surface of the deposit is judged by the feel of the operator's hand. There is a problem that the measurement results vary depending on the person. In other words, the surface of sediment such as slime is in a state in which earth and sand etc. are extremely gently deposited, and it is possible to obtain a clear reaction from the measuring tape as when the weight contacts the bottom of the groove. Since it is not possible, the skill of the measurer is required to measure the deposit thickness with a certain degree of accuracy.

Further, in the first method, as described above, the deposited thickness is obtained from the depth before sedimentation and the depth after sedimentation, and the deposited thickness cannot be directly measured. The second method is to measure the depth of the upper surface of the deposit, and the depth of the groove before the sediment such as sediment is measured in the same manner as the first method, and the depth before the sediment such as sediment is measured. It is necessary to obtain the deposition thickness from the depth and the depth after deposition, and the deposition thickness cannot be measured directly.

Further, as described above, the surface of the deposit is in a state in which soil and the like are gently deposited, and it is possible to accurately determine at what point in time the change in electrical conductivity the sensor is supposed to be in contact with the surface of the deposit. It is difficult to set, and the interface between the sediment and the stabilizing solution cannot be measured with high accuracy.

Therefore, when the deposit thickness is small, such as after the deposit is once removed, the difference in the deposit thickness can be roughly recognized. In addition, since components such as earth and sand mixed in the stabilizing solution differ depending on the site, physical properties such as electric conductivity of the stabilizing solution also differ, and it is necessary to finely adjust the setting of the sensor at the site at the time of measurement.

Further, the sensor requires electric power, and when a battery is used as a power source, preparations such as confirmation of the remaining capacity of the battery, replacement of the battery and charging are required at the time of measurement.
For these reasons, the measurement of the deposited thickness using the above-mentioned sensor requires complicated work and cannot be performed with high accuracy.

The third method is an effective method for measuring the deposit thickness per unit time, but in order to finally measure the deposit thickness before placing concrete, for example, removing the deposit It is necessary to sink the graduated cylinder later and pull up the graduated cylinder before pouring concrete, but when inserting the rebar cage into the groove, the graduated cylinder interferes and
When the reinforced cage is inserted into the groove with the graduated cylinder being sunk, the graduated cylinder may fall or be broken, and it is difficult to measure the deposited thickness after inserting the reinforced cage.

Further, as described above, when measuring the deposited thickness by the third method, it is necessary to install the graduated cylinder at the bottom of the groove and start the measurement before soil or the like is deposited. The measurement cannot be started in a timely manner. Furthermore, it is not easy to install the graduated cylinder almost vertically on the bottom of the groove.

The present invention has been made in view of the above circumstances, and it is possible to directly measure the deposition thickness of an underwater deposit by a simple operation by collecting the underwater deposit. An object of the present invention is to provide a sampling type deposit thickness measuring instrument.

[0018]

According to a first aspect of the present invention, there is provided a collecting type deposit thickness measuring instrument comprising a tubular body having an openable valve at its upper end and an open lower end, and the tubular body. The valve is provided with a linear member connected to an upper part and capable of pulling up the tubular body, and the valve is opened when the tubular body descends in water so that the tubular body can be vertically inserted. The means for solving the above problems is to close the tubular body when it is pulled up and close the upper end side of the tubular body.

According to the above configuration, for example, by lowering the lower end portion of the tubular body into a groove that has been excavated to construct an underground continuous wall and filled with a stabilizing liquid, The cylindrical body may be stuck in the deposit on the bottom of the groove. In order to pierce the deposit from the upper end to the lower end, the weight of the tubular member needs to be heavy to some extent when piercing the deposit.

Then, the inside of the cylinder pierced by the deposit is in a state of being filled with the deposit by the length of the cylinder pierced by the deposit. A valve is provided at the upper end of the cylinder, but while the cylinder is descending, the valve is open, so the flow of water inside the cylinder due to the descent is obstructed. In addition, the valve does not prevent the inside of the cylinder from being filled with the deposit when the cylinder penetrates into the deposit.

Here, the deposit filled in the cylinder is collected by pulling the cylinder out of the water. When the cylinder is pulled up, the valve at the upper end of the cylinder is closed. Therefore, the deposit and water filling the inside of the tubular body do not fall downward from the inside of the opened tubular body.

That is, when the deposit and the water fall from the inside of the cylinder, a negative pressure is generated inside the cylinder because the valve is closed, but in water, the cylinder is external due to water pressure. The cylinder is pressed by the atmospheric pressure in the atmosphere, and when the cylinder is pulled up, it is possible to prevent deposits and water from falling from the inside of the cylinder. it can. Therefore, it is possible to collect the deposit accumulated in the groove by the cylindrical body and measure the deposit thickness and the deposit amount.

According to a second aspect of the present invention, in addition to the above-mentioned constitution, a transparent portion which is a transparent member capable of seeing through the inside of the cylinder is provided on at least a part of the side surface of the cylinder in the vertical direction. Is provided along with the above as the means for solving the above problems. According to the above configuration, since the transparent portion that allows the inside of the cylinder to be seen through is formed on the side surface of the cylinder, the deposit thickness can be easily measured by observing from outside the cylinder without removing the deposit from the cylinder. can do.

According to a third aspect of the present invention, in the sampling type deposit thickness measuring instrument, the transparent member is provided with a scale on the see-through portion capable of measuring the thickness of the deposit collected inside the cylindrical body. This is the means for solving the above problems. According to the above configuration, the deposition thickness can be easily measured by reading the scale corresponding to the surface of the deposit collected in the cylinder in the transparent portion.

In the sampling type deposit thickness measuring instrument according to the fourth aspect of the present invention, the inner diameter of the cylindrical body is 20 mm to 50 mm, which is a means for solving the above-mentioned problems. The inner diameter of the cylinder is 20
If it is narrower than mm, when the cylinder sticks into the deposit (slime), it becomes difficult for the deposit to enter the cylinder,
If the inner diameter of the tubular body is wider than 50 mm, when the slime is collected and the tubular body is pulled up, there is a high possibility that the deposit will flow out.

According to a fifth aspect of the present invention, in the collection type deposit thickness measuring instrument, the valve is disposed at an upper end portion of the cylindrical body, and has a through hole communicating with the inside of the cylindrical body, and the valve. A valve body disposed on the seat and capable of closing the through hole, wherein the valve body has a main body portion capable of closing the through hole by abutting a lower surface of the valve seat, and a downward portion from the main body portion. The rod-shaped lower end portion that extends and is inserted into the through hole is provided, and the weight per unit volume of the lower end portion is heavier than that of the main body portion.

With the above construction, when the cylinder is lowered into the water, a water flow rising from the bottom to the top is generated inside the cylinder, and the water flow is also generated in the through hole of the valve seat. The upper valve body is pushed upward by the water flow to be in the open state. Further, when the cylinder is stopped, the valve body closes the through hole of the valve seat due to the weight of the valve body. Also,
When the inside of the cylinder is filled with water or deposits, when the water or deposits inside the cylinder try to fall downward, the inside of the cylinder tends to have a negative pressure, and the valve body is pushed through the through hole of the valve seat. The valve is inhaled and the valve is securely closed.

Further, when the cylinder is raised, the valve body is further pressed against the valve seat by the resistance of water. Therefore, the valve operates so that it does not require power, it opens when the cylinder descends, and closes when the cylinder stops or rises. The thickness can be measured.

Further, since the lower end portion of the valve body is inserted into the through hole of the valve seat, the valve body moves to the left and right when the valve body moves up and down with respect to the valve seat. Is regulated by the lower end inserted into the through hole. That is, the vertical movement of the valve body is guided by the lower end of the valve body and the through hole. Further, since the weight of the lower end portion per unit volume is heavier than that of the main body portion of the valve body, the lower end portion acts as a weight and the posture of the valve body can be maintained in a stable state.

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION A sampling type deposit thickness measuring instrument according to an embodiment of the present invention will be described below with reference to the drawings. FIG.
Fig. 1 shows a sampling type deposit thickness measuring instrument 1 as an example of this embodiment. As shown in FIG. 1, the collection type deposit thickness measuring instrument 1 includes a cylindrical tubular body 2 and a scale-equipped measuring tape 3 which is a linear member connected to the tubular body 2. Is.

The cylindrical body 2 includes an outer cylinder 4 and a transparent inner cylinder 5.
And a valve 6 provided at the upper end portion, and a measuring tape connecting portion 2a provided further above the valve 6. The outer cylinder 4 is made of, for example, a stainless steel tube, and has a relatively large weight and strength. Also, the outer cylinder 4
An opening 4a having a substantially rectangular shape elongated in the vertical direction is formed on the side surface of the outer cylinder 4 so that the inside of the outer cylinder 4 can be seen through the transparent inner cylinder 5.

The cylindrical body 2 having the outer cylinder 4 is dropped into water as will be described later and stabbed into the slime,
It is a measure of the deposited thickness, and it is preferable to descend vertically. The openings 4a are provided at two opposing positions on the outer peripheral surface of the outer cylinder 4 so as to maintain the balance of the cylinder. Is desirable.

The inner cylinder 5 is made of, for example, a transparent synthetic resin, and the outer diameter of the inner cylinder 5 is substantially the same as the inner diameter of the outer cylinder 4, and the outer cylinder 4 is inserted into the outer cylinder 4. It has been joined to. The cylindrical body 2 has a double structure including the outer cylinder 4 and the inner cylinder 5, and the opening 4 a of the outer cylinder 4 is closed by the inner cylinder 5.

Further, since the inner cylinder 4 is made of a transparent synthetic resin, the inside of the cylindrical body 2 is vertically visible through the opening 4a of the outer cylinder 4. And the inner cylinder 5
The lower end of the tubular body 2 is set to 0 and a scale 5a corresponding to the length (height) of the tubular body 2 in the vertical direction is attached to the portion exposed from the opening 4a of the outer barrel 4.

With the above structure, the thickness of the slime filled in the cylindrical body 2 can be measured from the opening 4a portion of the outer cylinder 4 as described later. The cylindrical body 2 has the double structure of the outer cylinder 4 and the inner cylinder 5 because the cylindrical body 2 is a transparent member so that the inside of the cylindrical body 2 can be seen through as described above. Although it is preferable that the outer tube 4 is made of a transparent material such as glass, it is generally weak in strength, and therefore has a high strength and is rustproof like the stainless steel tube.
By wrapping the inner cylinder 5 made of a transparent member, the strength of the collection type deposit thickness measuring instrument 1 is increased.

Furthermore, when the inner cylinder 5 is formed of a relatively lightweight member such as transparent synthetic resin, the inner cylinder 5 is wrapped with a relatively heavy outer cylinder 4 such as a stainless pipe, The weight of the collection type deposit thickness measuring instrument 1 can be increased, and the accuracy of measurement can be improved as described later.

The valve 6 is shown in FIGS. 2 (A), 2 (B) and 2 (C).
Is fixed to the inner surface of the upper end portion of the tubular body 2, and
A valve seat 7 having a through hole 7a penetrating vertically and the valve seat 7
And a stopper 9 for preventing the valve body 8 from coming off from the valve seat 7 portion.

The valve seat 7 has a cylindrical shape whose outer peripheral surface has an outer diameter substantially equal to the inner diameter of the cylindrical body 2 and is joined to the inner surface of the cylindrical body 2. Further, in the valve seat 7, the through hole 7a has a conical shape, and the inner surface thereof has a mortar shape.

The valve body 8 is formed in an inverted conical shape so that the outer surface of the valve body 8 contacts the inner surface of the valve seat 7 and the lower end portion 8a.
Has a rod shape, and has an inverted conical space formed therein. That is, the valve body 8 is formed in a funnel shape with its tip clogged. Further, the stopper 9 is formed in a disk shape that fits on the inner surface of the upper end portion of the valve seat 7, and has four holes 9a so that water or the like can flow while preventing the valve body 8 from falling off. … Is formed,
The remaining part has a cross shape.

The valve 6 having the above-mentioned structure
Because the inner surface (seat surface) of the valve seat 7 and the outer surface of the valve body 8 have an inverted conical shape, the seat surface of the valve seat 7 and the outer surface of the valve body 8 are in contact with each other when the valve 6 is closed. The contact surface is wide so as to prevent leakage of water or the like from the valve 6. Also, the valve seat 7
Since the seat surface of the valve body 8 and the outer surface of the valve body 8 have an inverted conical shape, when the valve body 8 moves downward due to its own weight or the like, the valve seat 7 naturally
The valve body 8 is adapted to abut on the valve seat 7 in a state where the center line of the valve body and the center line of the valve body 8 coincide with each other.

Further, the rod-shaped lower end portion 8a of the valve body 8 is inserted into the opening portion at the lower end portion of the valve seat 7, and when the valve body 8 moves up and down with respect to the valve seat 7. , It doesn't move to the left and right too much. The rod-shaped lower end 8a
Is preferably heavier per unit volume than the upper portion (main body) of the valve body 8, and by lowering the lower end portion 8a per unit volume, the lower end portion 8a acts as a weight and the valve 6 The posture of the valve body 8 can be stabilized during operation. In order to increase the weight of the lower end portion 8a of the valve body 8 per unit volume, a part or all of the lower end portion 8a may be made of a material heavier than the upper portion of the valve body 8 or the lower end portion 8a may have a heavy weight. The core material may be built in or the lower end 8
A heavy band-shaped member may be wound around a. That is, when the weight per unit volume of the lower end portion 8a is increased, it is not necessary to configure the lower end portion 8a with a homogeneous material, and a heavy member may be added to the lower end portion 8a. Further, in the valve 6, as shown in FIG.
As shown in (A), when the tubular body 2 is lowered in water, the valve body 8 is lifted by the water flowing from the bottom to the top in the valve seat 7 and the valve 6 is opened. It has become.

Further, in the valve 6, as shown in FIG. 3 (B), when the tubular body 2 is pulled upward, the valve body 8 is moved to the lower valve seat 7 by the water hitting the upper surface of the tubular body 2. The valve 6 is pressed so that the valve 6 is closed. Also,
Basically, the valve 6 drops even when it is stationary, when the valve body 6 comes into contact with the valve seat 7 due to its own weight to close and the inside of the cylinder body 2 is filled with water or deposits. The inside of the cylinder 2 tends to become a negative pressure due to the water or the deposit inside the cylinder 2 to be tried, while the valve body 8 is pressed from the outside to the internal valve seat 7 by the water pressure or the atmospheric pressure. It is in a closed state.

The graduated tape connecting portion 2a comprises three members extending from the upper end of the tubular body 2 to the center line of the tubular body 2 above the tubular body 2 and joined at one point. One end of the graduated tape 3 is fixed to the upper end joined to one point of the portion 2a. The scaled tape 3 is attached to the tubular body 2 as described above, and is used to pull up the tubular body 2 that has been lowered into water. Further, the scale (not shown) of the scaled tape 3 indicates the length when the lower end of the tubular body 2 is set to 0, and the water depth can be measured in the same manner as the measuring tape to which the weight is attached. It is possible.

Next, a method of measuring the deposited thickness using the above-mentioned sampling type deposited thickness measuring instrument will be described. First, as shown in FIGS. 4 and 5 (A), the cylindrical body 2 of the collection type deposition thickness measuring instrument 1
Is lowered into, for example, a trench a which is excavated for a continuous underground wall and filled with a stabilizing solution. At this time, in the valve 6 of the tubular body 2, as shown in FIG. 3 (A), the tubular body 2 is lowered in the stabilizing liquid, so that the valve 6 of the valve 6 flows from the bottom to the top. The valve body 8 is lifted upward by the stabilizing liquid, and the valve 6 is opened.

Next, the cylinder 2 that has reached the bottom of the groove a by descending in the groove a is stuck into the slime s accumulated on the bottom of the groove a, as shown in FIG. 5B. At this time, if the weight of the cylindrical body 2 is large to some extent, the tip end of the cylindrical body 2 penetrates the soft slime s accumulated on the bottom of the groove a and reaches the bottom surface of the groove a.

Then, the inside of the cylinder 2 whose tip has reached the bottom surface of the groove a is filled with slime s at a height corresponding to the deposited thickness. In addition, slime s
Even if the deposit such as is hard to some extent, it is possible to sufficiently cope with it by increasing the weight of the cylinder 2 or increasing the descending speed of the cylinder 2.

When the tip of the tubular body 2 reaches the bottom surface of the groove a, the depth of the groove a is measured by reading the scale of the graduated tape 3 connected to the tubular body 2 at the upper part of the groove a. can do. Further, in the cylindrical body stopped at the bottom of the groove a, the valve body 8 of the valve 6 is lowered downward by its own weight and the valve 6 is closed.

Next, the cylindrical body 2 is pulled up using the graduated tape 3. At this time, as described above, the valve 6 is in the closed state due to the weight of the valve body 8, and when the slime s inside the cylinder body 2 tries to drop downward, the inside of the cylinder body 2 becomes negative. Due to the pressure tendency, the valve body 8 of the valve 6 is pressed against the valve seat 7 by the external water pressure, and the slime is retained inside the tubular body 2.

Further, when the tubular body 2 is pulled up using the graduated tape 3, water resistance is generated in the upper portion of the tubular body 2, and the tubular body 2 is moved upward as shown in FIG. 3 (B). The valve body 8 of the valve 6 is pressed against the valve seat 7 by the water flow caused by pulling up the valve seat. Therefore, when the cylinder body 2 is pulled up, the valve body 8 does not come into close contact with the valve seat 7, the valve 6 does not open, and the slime s filled in the cylinder body 2 does not flow out. .

Further, even if the pulling up of the tubular body 2 is temporarily interrupted during the process, the valve body 8 is pressed against the valve seat by the weight of the valve body 8 and the water pressure as described above. The valve 6 never opens. Then, the cylindrical body 2 is pulled up from the water in the groove a to the ground, the inside of the cylindrical body 2 is seen through the opening 4a of the outer cylinder 4 of the cylindrical body 2, and the inner cylinder 5 is
The deposition thickness of the slime s can be measured by reading the scale 5a of the portion exposed in the opening 4a at the position of the upper surface of the slime s filled in the cylindrical body 2.

At this time, the state of the slime s can also be observed from the opening 4a, and the change of the particle size depending on the deposition height, the particle size of the entire slime, the kind of particles forming the slime, etc. can be observed. You can Further, by opening the valve 6, it is possible to take out the slime s from the cylindrical body and directly inspect the amount and state of the slime s.

As described above, according to the sampling type deposit thickness measuring instrument 1 of this embodiment, the deposit thickness is measured by lowering the tubular body 2 into water whenever it is desired to investigate the deposit thickness. can do. Moreover, since the deposition thickness can be directly measured, it is not necessary to measure the water depth before the deposition, and the deposition thickness can be easily measured.

If the cylindrical body 2 has a certain weight,
The tip of the cylindrical body 2 can surely penetrate the deposit to reach the groove bottom, and the deposit thickness can be accurately measured. That is, the deposited thickness can be accurately measured by a simple operation in which the tubular body 2 is lowered into water and then pulled up. Therefore, the measurement result does not vary depending on the measurer and the measurement conditions such as the physical properties of the stabilizing solution.

The sampling type deposit thickness measuring instrument 1 basically comprises a cylindrical body 2 provided with a valve 6 and a linear tape 3 with a scale.
It is a simple structure consisting of, and can be manufactured extremely inexpensively. Furthermore, because there are no electrically movable parts or parts that measure with electrical signals, there is no need to prepare for measurement such as power supply preparation, parameter setting, and other fine adjustments. A measurement can be made.

In addition to the measurement of the slime deposit thickness in the underground continuous wall method using a stabilizing solution, the sampling type deposit thickness measuring instrument 1 described above collects and collects underground deposits in the cast-in-place pile method using muddy water. It is possible to measure deposit thickness, collect deposits and measure deposit thickness in various water tanks, settling tanks of sewage treatment plants, drainage ditches, and other places where liquids are stored.

In the example of the above embodiment,
Although the valve 6 shown in FIG. 2 is used, the shape of the valve 6 is not limited to this, and for example, as shown in FIG. 6, a bowl-shaped valve seat 10 having an opening in the center and an upper surface. And a disc 11a having a substantially spherical lower surface and an extension 11b extending downward from the center of the disc 11a so as to be inserted into the opening of the valve seat 10. , Above Figure 2
A valve 13 having a stopper 9 and a stopper 12 having the same shape as shown in (B) may be used. In addition, in order to stabilize the posture of the valve body 11 as in the case of the example of the above-described embodiment, the weight per unit volume of the extending portion 11b (lower end portion) should be made heavier than the disc portion 11a (main body portion). Is preferred. Further, when increasing the weight per unit volume of the extension portion 11b, it is not necessary to configure the extension portion 11b with a homogeneous material, as in the case of the valve body 8 described above. A heavy member may be added.

Further, as shown in FIGS. 7A, 7B and 7C, a disc-shaped valve seat 13 having an opening at the center, a disc portion 14a, and a central portion of the disc portion 14a. The shaft portion (upper shaft portion 14
b, a coma-shaped valve body 14 composed of a lower shaft portion 14c),
A valve 16 having a stopper 15 formed in a disk shape and having a radial opening from the center may be used. In addition, in order to stabilize the posture of the valve body 14 as in the case of the above-described example of the embodiment, the lower shaft portion 14c is provided.
It is preferable that the weight per unit volume of the (lower end portion) is heavier than the disc portion 14a and the upper shaft portion 14b (main body portion). Further, when the weight per unit volume of the shaft portion 14c is increased, it is not necessary to configure the shaft portion 14c with a homogeneous material as in the case of the valve body 8 described above, and a heavy member is attached to the shaft portion 14c. It may be added.

That is, the valve 6 used in the present invention is basically such that, when the tubular body 2 is lowered in water, the valve body 8 is lifted from the valve seat 7 and opened by the water flow, and the tubular body 2 is stopped or raised. Water flow, water pressure, atmospheric pressure,
It is sufficient that the valve body 8 is pressed against the valve seat 7 to be closed by its own weight or the like, and the valve body 8 having such a configuration can be suitably used for the sampling type deposit thickness measuring instrument of the present invention.

Further, the valve 6 is not limited to the above-mentioned operating type, but a solenoid valve which operates by an instruction and power from the outside may be used. Since the operation and configuration of the vessel becomes complicated,
As described above, it is preferable that the valve operates without any external instruction or power.

Further, in the example of the above embodiment,
The cylindrical body 2 is composed of the outer cylinder 4 made of stainless steel and the inner cylinder 5 made of transparent synthetic resin, but the material of the cylindrical body 2 is not limited to these, and the structure of the cylindrical body 2 is not limited thereto. However, it is not limited to the double structure of the outer cylinder 4 and the inner cylinder 5.
For example, a tubular body made of reinforced plastic or the like may be used as the tubular body 2.

When reinforced plastic or the like is used for the tubular body 2, the tubular body 2 becomes relatively light in weight, and when the tubular body 2 is lowered, the tubular body 2 vertically moves the slime s, and It is necessary to add a weight or the like because there is a possibility that it will completely penetrate and not reach the groove bottom. Further, in the example of the above-described embodiment, the scaled tape 3 is used as the linear member for pulling up the tubular body 2, but the linear member is
Any material may be used as long as it does not hinder the lowering of the tubular body 2 and can raise the tubular body 2, and various tapes, strings, ropes, chains, etc. A member having flexibility as a whole can be used.

Further, as the linear member, various rod-shaped members may be used when the water depth at the time of measuring the deposited thickness is shallow. In the cylinder 2, slime s
A configuration may be used in which fins are provided to stabilize the posture of the tubular body 2 so that the tubular body 2 is vertically pierced when the tubular body 2 is pierced, or the center of gravity of the tubular body 2 is lowered.

Further, when the inner diameter of the cylinder 2 is large, there is a high possibility that slime s heavier than water will flow downward, and when the cylinder 2 is taken out of water, the cylinder 2
It is more likely that the water inside will flow out against the inner surface of the cylinder 2 against the adhesive force and surface tension. Therefore, the inside diameter of the cylinder 2 is preferably 50 mm or less, and the slime flows out more reliably. In order to prevent this, it is preferably 35 mm or less.

If the inner diameter of the tubular body 2 is too small, when the tubular body 2 pierces the slime s due to the resistance of water filled in the tubular body 2 or the side surface resistance generated on the inner surface of the tubular body 2,
It is preferable that the inner diameter of the tubular body 2 is 20 mm or more, because the slime s is hard to enter the inside of the tubular body 2. Furthermore, in order to measure the slime thickness accurately and stably, it is preferable that the inner diameter of the tubular body 2 be 25 mm to 30 mm.

[0065]

As described in detail above, according to the sampling type deposit thickness measuring instrument according to the first aspect of the present invention, the deposit thickness can be measured without preparing in advance before deposits are deposited. The deposit thickness can be measured by lowering the cylinder 2 into water at any time when it is desired to investigate. That is, since the deposit can be directly sampled to measure the deposit thickness, it is not necessary to measure the water depth before the deposit, and the deposit thickness can be easily measured.

If the cylindrical body 2 has a certain weight,
The tip of the cylindrical body 2 can surely reach the groove bottom, and the deposited thickness can be accurately measured. That is, the deposited thickness can be accurately measured by a simple operation in which the tubular body 2 is lowered into water and then pulled up. Therefore, the measurement result does not vary depending on the measurer and the measurement conditions such as the physical properties of the stabilizing solution.

Further, the sampling type deposit thickness measuring device basically has a simple structure composed of the cylindrical body 2 provided with the valve and the linear member, and can be manufactured at extremely low cost. Further, since the above-mentioned sampling type deposit thickness measuring instrument can be used for sampling deposits and measuring the deposit thickness at various places, it has a very wide application range and can be effectively used in various industries.

Further, according to the sampling type deposit thickness measuring instrument of the above-mentioned claim 2, the deposit collected in the tubular body 2 is filled into the tubular body 2 without being discharged from the tubular body 2. The deposited thickness can be measured from the see-through portion in the closed state. Further, according to the sampling type deposit thickness measuring instrument of the third aspect, the deposit thickness can be more easily measured by providing the scale on the transparent portion.

Further, according to the sampling type deposit thickness measuring instrument of the above-mentioned claim 4, by setting the inner diameter of the cylindrical body 2 to 20 mm to 50 mm, the cylindrical body is too thin, so that the deposit can be sampled sufficiently. In addition, it is possible to prevent an error in the measurement of the deposited thickness, and to prevent the deposit from flowing out of the tubular body and making it impossible to measure the deposited thickness when the tubular body is pulled up.

According to the sampling type deposit thickness measuring instrument of the fifth aspect, in response to the lowering, stopping and raising of the cylindrical body 2,
Since the valve opens and closes without using power, it is not necessary to prepare a power source when measuring the deposited thickness, and the deposited thickness can be easily measured. Further, the rod-shaped lower end portion of the valve body inserted into the through hole of the valve seat restricts the lateral movement of the valve body and guides the vertical movement of the valve body, thus ensuring the operation of the valve. be able to. Also, by making the lower end of the valve body heavier in weight per unit volume, the lower end of the valve body acts as a weight and stabilizes the posture of the valve body during operation, thus further ensuring the operation of the valve. can do.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing a collection type deposited thickness measuring instrument according to an example of an embodiment of the present invention.

FIG. 2 is a drawing for explaining the structure of a valve of the collection type deposit thickness measuring instrument according to an example of the above embodiment.

FIG. 3 is a cross-sectional view showing an operating state of a valve of the collection type deposited thickness measuring instrument according to the example of the embodiment.

FIG. 4 is a diagram for explaining a method of using the sampling area deposition thickness measuring instrument according to the example of the above embodiment.

FIG. 5 is a diagram for explaining a method of using the sampling area deposition thickness measuring instrument according to the example of the embodiment.

FIG. 6 is a cross-sectional view showing a valve having a structure different from that of the valve of the collection area deposition thickness measuring instrument according to the example of the above embodiment.

FIG. 7 is a diagram for explaining a valve having a structure different from that of the valve of the sampling area deposition thickness measuring instrument according to the example of the above embodiment.

[Explanation of symbols]

 s slime (deposit) 1 sampling type deposit thickness measuring instrument 2 cylinder 3 tape with scale (linear member) 4a opening 6 valve

 ─────────────────────────────────────────────────── ─── Continuation of the front page (71) Applicant 000150615 Haseko Corporation 2-32-1, Shibaura, Minato-ku, Tokyo (72) Inventor Kazuhisa Yamamoto 3-12-8 Shibaura, Minato-ku, Tokyo Ando Construction Co., Ltd. In the company

Claims (5)

[Claims] 1. A cylindrical body having an openable and closable valve at an upper end and an opened lower end, and a linear member connected to an upper portion of the cylindrical body and capable of pulling up the cylindrical body. The valve is opened when the tubular body descends in water so that the tubular body can be vertically inserted, and is closed when the tubular body is pulled up, the upper end side of the tubular body. A collection type deposit thickness measuring instrument, characterized in that it is in a closed state. 2. The extraction formula according to claim 1, wherein a transparent portion made of a transparent member that allows the inside of the cylinder to be seen through is provided on at least a part of a side surface of the cylinder along a vertical direction. Deposition thickness measuring instrument. 3. The collection-type deposition according to claim 2, wherein the transparent portion formed of the transparent member is provided with a scale capable of measuring the thickness of the deposit collected inside the cylindrical body. Thickness measuring instrument. 4. The collection type deposit thickness measuring instrument according to claim 1, wherein the inner diameter of the cylindrical body is 20 mm to 50 mm. 5. The valve is arranged at an upper end portion of the cylindrical body, and has a through hole communicating with the inside of the cylindrical body, and a valve body disposed on the valve seat and capable of closing the through hole. The valve body comprises a main body part capable of closing the through hole by bringing the lower surface into contact with the valve seat, and a rod-like body extending downward from the main body part and inserted into the through hole. A lower end portion, and a weight per unit volume of the lower end portion is heavier than that of the main body portion.
A collection type deposit thickness measuring instrument according to any one of 1.