JP5084256B2 - How to insert a probe bar when measuring soil thermal resistance - Google Patents

Description

The present invention, plug Saguharibo in the soil relates to the plugged in method of the probe rod during soil thermal resistance measurement for measuring soil thermal resistance.

  The transmission capacity of the power cable is affected by the thermal resistance of the surrounding soil where the cable is embedded. Therefore, as one of the basic data for cable design, the soil specific thermal resistance of the cable burial route is measured.

As a technique for measuring such a soil thermal resistance, for example, a probe bar having a heat source and a temperature measuring means, such as Japanese Patent Application Laid-Open No. 11-23503 “Soil Thermal Resistance Measuring Device” of Patent Document 1, is used. A soil thermal resistance measuring instrument has been proposed in which a temperature measurement means is used to measure the temperature change when heated by a heat source for a certain period of time and the thermal resistance is calculated from this temperature gradient.
Japanese Patent Laid-Open No. 11-23503

  The soil thermal resistance is calculated from the heat dissipation of the soil. In order to measure the thermal resistance, it is necessary to drive the probe bar 51 into the soil as shown in FIGS. 5 (a) and 5 (b). For example, if the ground is soft, the probe bar 51 can be directly driven. The probe bar 51 is driven by directly hitting the upper part of the probe bar 51 with a hammer. When the probe bar 51 is hit hard in this way, a lead wire for heat measurement is contained inside the probe bar 51, and there is a hot water that breaks the probe bar 51 due to breakage caused by vibration during driving. . In order to prevent this, as shown in FIGS. 6A to 6D, there has been proposed a method in which an insertion hole 52 is previously formed using a guide bar and the probe bar 51 is inserted into the insertion hole 52.

  When measuring the soil thermal resistance of the hard ground, for example, a steel guide rod is driven, and then the guide rod is pulled out to form an insertion hole 52 into which the probe rod 51 is inserted.

  However, when the ground is hard, it may be difficult to drive the guide bar vertically. Furthermore, since it is difficult to pull out the guide rod driven into the hard ground, the operation of opening the insertion hole 52 is complicated and has a problem that it takes a long time.

  On the other hand, when the ground is soft, the insertion hole 52 may collapse, making it difficult to insert the probe bar 51. In such an operation, the probe bar 51 is easily damaged.

  Further, if there is a gap between the probe bar 51 and the insertion hole 52, a measurement error tends to occur. Therefore, conventionally, cement was filled in the gap, but since this cement was easily hardened, a quick measurement operation was forced.

The present invention has been developed to solve such problems. That is, the object of the present invention is to insert the probe bar without damaging the soil even in soft ground or hard ground, and prevent soil collapse of the insertion hole, and to provide a plugged in methods of the probe rod during soil thermal resistivity measurements that can be measured with high accuracy soil thermal resistance.

In the insertion method of the present invention, the probe rod (51) is inserted into the soil (s), the temperature change when the probe rod (51) is heated with a heat source for a certain time is measured, and the thermal resistance is calculated from this temperature gradient. A method for inserting a probe bar when measuring the soil thermal resistance, wherein the probe bar (51) is inserted into the soil (s) when measuring the soil thermal resistance. A cylindrical guide rod (1) having an outer diameter longer than the diameter and formed longer than the length in the longitudinal direction of the probe rod (51) can be driven easily and can be pulled out easily. the degree of soft ground soil (s), the guide driving rod (1), then, the guide rods (1) forming a soil longitudinally into the insertion hole is withdrawn from the (s) (52), wherein to prevent collapse of the soil (s) into the insertion hole (52) in the measuring thermal resistance of the soil (s) High thermal conductivity because, and there is a fluidity injected fluid (4), finally, air gap and said insertion hole to prevent the measurement error (52) and said Saguharibo (51) A probe bar (51) is inserted into the fluid (4) in the insertion hole (52) so as not to occur .

Alternatively, in the insertion method of the present invention, the probe rod (51) is inserted into the soil (s), the temperature change when the probe rod (51) is heated with a heat source for a certain period of time is measured, and the heat from this temperature gradient is measured. A method for inserting a probe bar in measuring soil thermal resistance, wherein the probe bar (51) is inserted into the soil (s) when measuring the soil thermal resistance by obtaining resistance, the probe bar (51) Of a cylindrical guide rod (11) having an outer diameter longer than the shaft diameter and longer than the length of the probe rod (51) in the longitudinal direction and a hard ground that is difficult to pull out. Screw the guide rod (11) with the ridges into the soil (s) while rotating it, and then pull out the guide rod (1) from the soil (s) while rotating it backward to insert it vertically (52) In order to prevent the soil (s) from collapsing in the insertion hole (52). The fluid (4) having high thermal conductivity and fluidity for measuring the thermal resistance of () is injected, and finally, the insertion hole (52) and the probe bar ( 51), the probe rod (51) is inserted into the fluid (4) of the insertion hole (52) so that no gap is generated.
Also, for example, bentonite liquid is injected into the insertion hole (52) as the fluid (4).

In the configuration of the present invention, a guide rod (1, 11) thicker than the probe rod (51) is vertically driven or screwed into the soil and pulled out, and the fluid (4) such as bentonite is inserted into the insertion hole (52) formed after extraction. To prevent the insertion hole (52) from collapsing and insert the probe bar (51) so as to eliminate voids in the fluid (4). Since the fluid (4) can prevent the soil (s) from collapsing, the probe bar (51) is not directly smashed, so that the probe bar (51) can be prevented from being damaged. .
Further, since the gap between the insertion hole (52) and the probe rod (51) is filled with the fluid (4) to eliminate the gap, measurement errors can be prevented and high-precision measurement is possible.

  Moreover, in the guide rod (11) with a ridge in which a spiral ridge (5) is formed around the guide rod main body (2), the rotation of the guide rod (1) allows the inside of the soil (s). Therefore, the insertion hole (52) can be easily opened even on hard ground. In addition, since the guide rod (11) with ridges can be easily pulled out by rotating in the reverse direction, the operation of opening the insertion hole (52) can be performed quickly. Furthermore, since the tip (3) is detachable, it can be used properly according to the condition of the soil (s) and the hardness of the ground.

  The method of inserting the probe rod at the time of measuring the soil thermal resistance of the present invention is a method of inserting or screwing the guide rod into the soil, forming an insertion hole in the vertical direction, and inserting the probe rod into the insertion hole into which the fluid is injected. is there. The temperature change when this probe bar is heated with a heat source for a certain time is measured, and the thermal resistance is obtained from this temperature gradient to measure the soil thermal resistance.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a flowchart of work items showing a method of inserting a probe bar according to the first embodiment. 2A and 2B are explanatory views showing a method of inserting the probe bar of Example 1, wherein FIG. 2A is a guide bar used for insertion, FIG. 2B is a state in which the guide bar is driven into soil, and FIG. 2C is a guide bar. (D) is a state in which a fluid is injected into the insertion hole, (e) is a state in which the probe bar is inserted into the insertion hole, and (f) is a state in which the probe bar is inserted and measured. .
The method of inserting the probe rod at the time of measuring the soil thermal resistance of the first embodiment is suitable for soft ground that allows the guide rod 1 to be driven easily and pulled out easily. In this insertion method, first, the guide rod 1 is driven into the soil s whose soil thermal resistance is to be measured (FIG. 2 (b)). As shown in FIG. 2A, the guide rod 1 has an outer diameter longer than the axial diameter (outer diameter) of the probe rod 51 and is longer than the length of the probe rod 51 in the longitudinal direction. A cylindrical guide bar main body 2 and a pointed tip 3 at one end of the guide bar main body 2 are provided. The pointed portion 3 is integrated with the guide rod main body 2 or is configured to be detachable and replaceable. The shape of the tip 3 may be either a cone or a pyramid. The material may be either metal or synthetic resin. Depending on the situation of the soil s, it is used properly.

  Next, the guide rod 1 is pulled out from the soil s to form an insertion hole 52 in the vertical direction (FIG. 2 (c)). Since the guide bar 1 of the first embodiment is a long and narrow cylindrical guide bar body 2, it can be easily pulled out if it is a soft ground.

  The fluid 4 is injected into the insertion hole 52 (FIG. 2D). For example, bentonite liquid is used as the fluid 4. The fluid 4 is not limited to this material as long as it has high thermal conductivity for measuring the thermal resistance of the soil s and has fluidity. For example, in addition to this bentonite liquid, a plasticizer used in the semishield method, a water glass chemical used in a chemical solution injection method, and the like can also be used.

  Since the fluid 4 can prevent the soil s from collapsing, the probe bar 51 is not directly struck, and damage to the probe bar 51 can be prevented.

  Finally, the probe bar 51 is inserted into the fluid 4 in the insertion hole 52, and the soil thermal resistance is measured (FIGS. 2 (e) and 2 (f)). A temperature change is measured when the probe bar 51 is heated with a heat source for a predetermined time, and a thermal resistance is obtained from this temperature gradient. Since the gap between the insertion hole 52 and the probe bar 51 is filled with the fluid 4 and the gap is eliminated, measurement errors can be prevented and high-precision measurement can be performed.

FIG. 3 is a flowchart of work items showing a method of inserting the probe bar of the second embodiment. 4A and 4B are explanatory views showing a method of inserting the probe bar of Example 2, wherein FIG. 4A is a guide bar with a protruding line, FIG. 4B is a state in which the guide bar is screwed into the soil, and FIG. (D) is a state in which a fluid is injected into the insertion hole, (e) is a state in which the probe rod is inserted into the fluid, and (f) is a state in which the probe rod is inserted and measured. is there.
In the method of inserting the probe rod of the second embodiment, the insertion hole 52 is opened using the guide rod 11 having a protruding line formed with a thread as shown in FIG. The method of inserting the probe rod of the second embodiment is suitable for hard ground where it is difficult to drive the guide rod 11 with ridges and pull it out. Of course, it can also be used on soft ground.

  The guide rod 11 with ridges used in the second embodiment has a cylindrical guide rod body having an outer diameter longer than the axial diameter of the probe rod 51 and longer than the length of the probe rod 51 in the longitudinal direction. 2, a sharp pointed portion 3 provided at one end of the guide rod body 2, and a spiral ridge 5 formed around the guide rod body 2.

In the method for inserting the probe bar of the second embodiment, first, the guide bar 11 with a protruding line is screwed into the soil s. This guide rod 11 with ridges can be screwed into the soil s by simply rotating it using a drill (not shown) or the like (FIG. 4B). Therefore, the insertion hole 52 can be easily opened even in a hard ground (FIG. 4C).
Since the guide rod 11 with the ridges can be easily removed if it rotates in the reverse direction, the operation of opening the insertion hole 52 can be performed quickly.

  Thereafter, the fluid 4 is injected into the insertion hole 52 (FIG. 2 (d)), and then the probe bar 51 is inserted into the fluid 4 of the insertion hole 52 by the same means as in the first embodiment. Soil thermal resistance is measured (FIGS. 2 (e) and (f)).

  The present invention is not limited to the embodiment of the invention described above, and even if it is a soft ground or a hard ground, the probe bar 51 can be reliably inserted into the soil s without being damaged and inserted. If the soil collapse of the hole 52 can be prevented by injecting the fluid 4 such as bentonite and the soil thermal resistance can be measured with high accuracy, the configuration is not limited to the illustrated one, and the gist of the present invention. Of course, various changes can be made without departing from the scope of the invention.

  The present invention is mainly used when inserting a probe bar when measuring soil thermal resistance, but can also be used when inserting a measuring device in soil.

It is a flowchart of the work item which shows the insertion method of the probe stick of Example 1. FIG. It is explanatory drawing which shows the insertion method of the probe rod of Example 1, (a) is the guide rod used for insertion, (b) is the state which drives a guide rod in soil, (c) is a guide rod from an insertion hole. A state in which the probe is pulled out, (d) is a state in which the fluid is injected into the insertion hole, (e) is a state in which the probe bar is inserted into the fluid, and (f) is a state in which the probe bar is inserted and measured. It is a flowchart of the work item which shows the insertion method of the probe stick of Example 2. It is explanatory drawing which shows the insertion method of the probe rod of Example 2, (a) is a guide rod with a protruding item | line, (b) is the state which screws a guide rod in soil, (c) is a guide rod from an insertion hole. A state in which the probe is pulled out, (d) is a state in which the fluid is injected into the insertion hole, (e) is a state in which the probe bar is inserted into the fluid, and (f) is a state in which the probe bar is inserted and measured. It shows a conventional method of driving a probe bar into soil, (a) is a flow chart of work items, and (b) is an explanatory diagram of a state in which the probe bar is driven directly into the soil. It shows a method of inserting a probe bar into a conventional soil using a guide bar and measuring it, (a) is a flowchart of work items, (b) is an explanatory diagram of a state where the guide bar is driven into the soil, (c) Is an explanatory view of the state of the insertion hole, and (d) is an explanatory view of a state in which the probe bar is inserted.

DESCRIPTION OF SYMBOLS 1 Guide rod 2 Guide rod main body 3 Pointed end 4 Fluid 5 Projection 11 Guide rod 51 with projection 51 Probe rod 52 Insertion hole

Claims (3)

The probe rod (51) is inserted into the soil (s), the temperature change when the probe rod (51) is heated with a heat source for a certain time is measured, and the thermal resistance is obtained from this temperature gradient to measure the soil thermal resistance. When inserting the probe rod (51) into the soil (s), the method of inserting the probe rod at the time of soil thermal resistance measurement,
A cylindrical guide rod (1) having an outer diameter longer than the axial diameter of the probe rod (51) and longer than the length in the longitudinal direction of the probe rod (51) can be easily driven. can, and the degree of soft ground soil can be easily pulled out (s), driving the guide rods (1),
Next, the guide rod (1) is pulled out from the soil (s) to form an insertion hole (52) in the vertical direction,
In order to prevent the soil (s) from collapsing in the insertion hole (52), a fluid (4) having high thermal conductivity and fluidity for measuring the thermal resistance of the soil (s ) is injected. And
Finally, Saguharibo in said fluid of said insertion hole (52) and said Saguharibo (51) said so as void does not occur and the insertion hole to prevent the measurement error (52) (4) ( 51) is inserted, the probe rod insertion method at the time of soil thermal resistance measurement characterized by the above-mentioned. The probe rod (51) is inserted into the soil (s), the temperature change when the probe rod (51) is heated with a heat source for a certain time is measured, and the thermal resistance is obtained from this temperature gradient to measure the soil thermal resistance. When inserting the probe rod (51) into the soil (s), the method of inserting the probe rod at the time of soil thermal resistance measurement,
Driving a cylindrical protruding guide rod (11) having an outer diameter longer than the axial diameter of the probe rod (51) and longer than the length in the longitudinal direction of the probe rod (51); the soil (s) of the hard pull is difficult ground, screwing while rotating the convex guided rod (11),
Next, the guide rod (1) is pulled out while rotating backward from the soil (s) to form an insertion hole (52) in the vertical direction,
In order to prevent the soil (s) from collapsing in the insertion hole (52), a fluid (4) having high thermal conductivity and fluidity for measuring the thermal resistance of the soil (s ) is injected. And
Finally, Saguharibo in said fluid of said insertion hole (52) and said Saguharibo (51) said so as void does not occur and the insertion hole to prevent the measurement error (52) (4) ( 51) is inserted, the probe rod insertion method at the time of soil thermal resistance measurement characterized by the above-mentioned.   3. The method for inserting a probe bar during measurement of soil thermal resistance according to claim 1, wherein bentonite liquid is injected as the fluid (4) into the insertion hole (52).

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