JPH0424418Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Purpose of the invention (1) Industrial application field This invention is used in civil engineering, agriculture, landscaping, and other fields, and can easily and simply grasp the permeability of the ground on-site. Regarding on-site permeability test equipment.

For example, in the field of landscaping and greening, if the water permeability of the planting ground is poor, if you plant without special soil improvement, root rot will occur, causing damp withering and withering from the treetops, resulting in large It will spoil the aesthetic appearance. Therefore, in order to prevent this, it is necessary to check the water permeability of the planting ground and, if it is poor, take measures for underground drainage. Therefore, there is a need for an on-site water permeability tester that can easily and simply determine the water permeability of the planting ground on-site.

(2) Conventional technology Dry auger hole is one of the methods for measuring ground permeability on site.
The law is known. This method is applied to the ground with a diameter of 10~
A measuring hole of 20 cm and a depth of about 1.0 m or more is dug, water is poured into the hole, and the amount of water supplied is measured while supplying water so that the water level is kept constant using a constant water level water supply device. be. In this method, a water level detection mechanism detects the water level in the measurement hole, and when a drop in the water level is detected, a solenoid valve operates to automatically supply water from the tank to restore the specified water level to maintain a constant water level. Alternatively, it is necessary to float a float in the measurement hole and transmit its movement to a lever to automatically control the water supply and keep the water level constant.

(3) Problems to be solved by the invention On-site water permeability measurement using the dry auger hole method requires a water level detection device and an automatic water supply device. All of these devices are not only complicated, large-scale, and expensive, but also require a power source to drive the devices.

B. Structure of the invention (1) Means for solving the problems The field permeability tester according to the invention consists of a holder,
It has a guide member and a measuring rod.

The holder has a plate, a hole, and a frame, the plate is sized to cover the measurement hole, the hole is drilled in the plate, and the frame is fixed to the periphery of the hole and has an upper part at one end. A support groove with a tightening seat is formed.

The guide member has a pipe, two pins, and a thumbscrew, the two pins are fixed to the outer circumference of the pipe on the same axis perpendicular to the pipe axis and extend in opposite directions, and the thumbscrew is It is screwed into one outer end of the pin so that it can move forward and backward in the axial direction.
The guide member is supported by the frame so that it can swing freely by fitting each pin into the support groove, and can be fixed by tightening a fastening seat between the thumbscrew and one of the pins. .

The measuring rod includes a rod and a float, and the rod is slidably inserted into the pipe with the other end protruding outward from the pipe, and the float has a larger diameter than the rod and has a float at one end. installed.

(2) Action A vertical measurement hole is drilled in the ground at the measurement site.
Install an on-site permeability tester to cover this measurement hole. Since the guide member is swingably supported by the holder, the guide direction can be made vertical. If the guide member is stopped at this point, the measuring rod will be guided in the vertical direction.

A water injection pipe supplies water into the measurement hole from the gap around the through hole of the holder. In that case, the water coming out of the water injection pipe will hit the float,
If you prevent it from directly hitting the hole bottom or inner wall, the hole bottom or inner wall will not be gouged out by the force of the water when water is poured. Pour water to the specified water level while checking the scale on the measuring rod.

As the water level in the measuring hole decreases due to water permeation, the measuring rod descends. The water loss depth is determined by reading the relative position of this measuring rod with respect to the guide member.

(3) Example This on-site water permeability tester 1 consists of a holder 2, a guide member 3, and a measuring rod 4.

The holder 2 has a transparent circular plate 21 and a cylindrical frame 22. A through hole 23 is provided in the center of the plate 21, and a water inlet 24 is provided in the vicinity thereof as required. The frame body 22 has a through hole 23
is fixed around the periphery of the

The guide member 3 consists of a transparent pipe 31, two pins 32 and 33, and a thumbscrew 34 screwed into the outer end of the pin 32 so as to be movable forward and backward in the axial direction of the pin. The pins 32 and 33 are fixed to the outer periphery of the pipe 31 via a support 35 on the same axis perpendicular to the axis of the pipe 31, and extend outward from the outer periphery in opposite directions.

A support groove 25 into which the pins 32 and 33 are rotatably fitted is formed in the upper part of the frame 22. A tightening seat 26 is provided at the outer end of the support groove 25 on the side that supports the pin 32. When the pins 32 and 33 are fitted into the support grooves 25, the guide member 3 is swingably supported by the frame 22. Further, by screwing in the thumbscrew 34, the clamping seat 26 is tightened between the pin 32 and the thumbscrew 34, and the guide member 3 can be fixed. In this way, the guide member 3 is supported by the holder 2 so as to be able to swing and stop.

The measuring rod 4 includes, for example, a rod 41 with a scale of 50 cm or 120 cm in length and a disc-shaped float 42.
has. The rod 41 is inserted into the pipe 31. The float 42 has a larger diameter than the rod 41 and is attached to one end thereof. The rod 41 is guided in the axial direction by the pipe 31 and is movable within the through hole 23 .

To measure water permeability, first, a vertical measurement hole 51 with a diameter of 10 to 20 cm and a depth of 30 to 100 cm is excavated in the ground at the measurement site. Next, the on-site water permeability tester 1 is installed so as to cover this measurement hole. Fixing devices 2 such as pins and nails are inserted into several small holes 27 drilled in the plate.
8, the retainer 2 is attached to the soil surface 5.
Fixed at 2.

Make the pipe 31 vertical and tighten the thumbscrew 34. When the tightening seat 26 of the support groove 25 of the frame body 22 is sandwiched between the pin 32 and the thumbscrew 34,
The guide member 3 stops on the holder 2 and the pipe 31
is maintained in a vertical state and guides the measuring rod 4 in the vertical direction.

Since the guide member 3 is swingably supported by the holder 2, the pipe 31 can be aligned in a vertical position even when installed on a slope 53, as shown in FIG. 4, for example. .

Next, a water injection pipe (not shown) is inserted into the clearance around the through hole 23 of the holder 2 or into the water injection port 24 to supply water into the measurement hole 51. In that case, the water coming out of the water injection pipe will hit the disc-shaped float 42 once, and if you avoid directly hitting the bottom of the hole or the inner wall, the bottom of the hole or the inner wall will be gouged out by the force of the water when water is poured. Never. In this way, water is poured to a predetermined water level.

If the upper end position of the guide pipe 31 is used as a reference for reading the scale, and the initial water level position is set to, for example, "0", water can be poured into the measurement hole 51 while looking at the scale of the measuring rod 4. If the upper end position of the guide pipe 31 is set considerably higher than the position of the holder 2, it is possible to read the scale of the measuring rod 4 with a slight bend, making the reading work easier. After pouring water to the initial water level, read and record the depth of water loss using a scale, for example, every 20 minutes.

Since the plate 21 is transparent, the inside of the measurement hole 51 can be observed during the water permeability test.

If you plot the results measured in this way in a graph and connect these points with smooth lines, you can see that in the case of a soil base for general planting, the value will settle down to a stable value after about an hour, and the final value will be reached. It is possible to find the depth of water loss. According to the research results conducted by the present inventor so far, the final depth of water reduction obtained using the on-site permeability tester as described above depends on the nature of the planted trees, but generally speaking, the final depth of water reduction obtained using the above-mentioned on-site permeability tester is not enough to cause moisture damage to the planted trees. It can be fully used to determine whether the soil base provides

C. Effects of the invention According to the invention, since the measurement hole can be covered with a holder, it is possible to prevent foreign objects from getting into the measurement hole, and the guide member can be used even in the field where the majority of cases are on slopes. It is possible to make accurate measurements by keeping the measuring rod vertical by swinging, and the structure is extremely simple and inexpensive, and the reduced water depth of the planting soil base can be determined extremely easily.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view showing a specific example of the in-situ permeability tester according to the present invention installed on the soil surface;
Fig. 2 is a sectional view of the main part of the on-site permeability tester, Fig. 3 is a plan view of the same, and Fig. 4 is a sectional view showing the state installed on the same slope. 1... Field permeability tester, 2... Holder, 3...
Guide member, 4... Measuring rod, 21... Plate,
22...frame body, 23...through hole, 24...water inlet,
25... Support groove, 26... Tightening seat, 27... Pore, 28... Fixture, 31... Pipe, 32,3
3...Pin, 34...Thumbscrew, 35...Support,
41... Rod, 42... Float, 51... Measurement hole, 52... Soil surface, 53... Slope.

Claims (1)

[Claims for Utility Model Registration] (1) It has a holder 2, a guide member 3, and a measuring rod 4, the holder 2 has a plate 21, a through hole 23, and a frame 22, and the plate 21 has a A through hole 23 is bored in this plate 21 with a size that covers the measuring hole 51, and the frame body 22 is fixed to the periphery of the through hole 23 and has a support groove 2 in its upper part, which has a tightening seat 26 at one end.
5 is formed, the guide member 3 has a pipe 31,
It has two pins 32, 33 and a thumbscrew 34,
Two pins 32 and 33 are fixed to the outer periphery of the pipe on the same axis perpendicular to the pipe axis and extend in opposite directions, and a thumbscrew 34 is attached to the outer end of one of the pins 32 in the axial direction. The guide member 3 is screwed into the frame body 2 so that it can move forward and backward.
2, each pin 32, 33 is fitted into the support groove 25 so that it can swing freely, and the fastening seat 26 is tightened between the thumbscrew 34 and one pin 32 so that it can be fixed freely;
The measuring rod 4 includes a rod 41 and a float 42.
The rod 41 is slidably inserted into the pipe 31 with the other end protruding outward from the pipe, and the float 42 has a larger diameter than the rod 41 and is attached to one end thereof. Characteristic on-site water permeability tester. (2) The on-site water permeability tester according to claim 1, wherein the plate 21 is transparent and circular. (3) The transparent circular plate 21 has a water inlet 2.
4. The on-site water permeability tester according to claim 2 of the utility model registration request, which is perforated with 4. (4) The on-site water permeability tester according to claim 1, 2 or 3 of the utility model registration claim, wherein the rod 41 of the measuring rod 4 has a scale, and the upper edge of the pipe 31 serves as an index. . (5) The on-site water permeability tester according to claim 1, 2, 3 or 4 of the utility model registration, wherein the pipe 31 is transparent.