JP5618330B2 - Ground insertion tube - Google Patents

Description

The present invention relates to a ground insertion pipe configured to be rigidly connected to a plurality of pipe materials and to be inserted into the ground . In particular, the ground insertion pipe is configured by connecting pipe materials to each other, and at the same time, deformation generated in the pipe material is highly sensitive. It is related with the ground insertion pipe provided with the connecting member with a sensor which can be detected.

  For example, as a method of stabilizing the slope, a large number of anchors are inserted on the slope so as to reach a predetermined depth of the stable ground, and a supporting plate attached to the head of each anchor is applied with a tensile force against the anchor. There is a slope stabilization method that fastens to the ground and applies bearing pressure to the ground. The anchor and the bearing plate can exert resistance to the movement of the ground, and the movement of the unstable soil mass on the slope can be suppressed.

Conventionally, for unstable slopes that need to consider the possibility of slope failure, apart from measures to reinforce slopes, sensors that detect slope behavior or deformation are installed on slopes. Technology related to slope observation systems that observe the situation is being implemented.
In the case of a slope that has been constructed with a slope stabilization method, a sensor is not directly installed on the slope as in the past, but for example, a sensor is attached to the anchor to detect deformation that has occurred on the anchor, and the behavior or deformation of the slope is detected. If detected, it is efficient in various respects.
In the case of slope stabilization method, pipe material may be used as an anchor. In that case, a strain gauge sensor is attached to the outer peripheral surface of the pipe material to detect bending deformation of the anchor that resists movement of the ground. It is possible.

There exist patent document 1 and patent document 2 as what attached the sensor to the pipe material inserted in the ground.
Patent Document 1 is a pipe strain gauge that measures the strain of the ground in order to prevent the collapse of a natural ground and the landslide of a slope, and connects a plurality of pipes (measurement pipes) with joint pipes and the longitudinal direction of the pipes. A strain gauge is attached to the outer surface of the middle part, and the measurement cable is passed through the pipe.

  Patent Document 2 is a strain measuring device for a drilling pipe that remotely controls and measures strain acting on the drilling pipe. This strain measuring device for a drilling pipe can detect a tensile force, a bending force and a torque acting on the drilling pipe with high sensitivity and can withstand an accidental high load. A cylindrical sensing member 1 having 8 attached to the outer peripheral surface is attached to the excavation pipe 3, a safety element 2 made of a pipe is attached to the inner surface of the sensing member 1, and play between the sensing member 1 and the safety element 2 This is a complicated configuration in which the pins 4, 5, 6 are connected.

Utility model registration No. 2514095 (Japanese Utility Model Laid-Open No. 4-29806) Shoko 51-866

Since the pipe strain gauge of Patent Document 1 attaches a sensor to the outer peripheral surface of a pipe (measurement pipe) itself inserted into the ground, the sensitivity of strain detection cannot be sufficiently increased when the rigidity of the pipe is large. Conceivable. In addition, when inserted into the ground, the sensor may be damaged by contact with the hole wall. Also, depending on the pipe used, there may be a case where the sensor cannot be attached.
Further, the strain measuring device for excavation pipes of Patent Document 2 has a very complicated structure for a special purpose, and it is desired to have a versatile and simple structure.

The present invention has been made in view of the above circumstances, is capable of highly sensitive strain detection, has no risk of damaging the sensor when inserted into the ground, has few restrictions from the tube itself, and has a simple structure. An object of the present invention is to provide a ground insertion pipe provided with a connecting member.

The present invention that solves the above problems is a ground insertion tube that is constructed by rigidly connecting a plurality of pipe members with a connecting member, and is inserted into the ground,
The connecting member is a hollow cylindrical body, the sensor according to the strain gauge for the rigidity of the groove portion is lower than the rigidity of the tube member, to detect the deformation generated in the tube member by forming a groove on its outer peripheral surface Affixed to the groove ,
Together with the tube material of the connecting portion sides are connected rigidly by the connecting member in a state where the tube end is separated from each other, viewed from the tubing side and the groove area W of the connecting member and the region S between the spaced pipe ends positional relation matches some or all, and the position of the sensor affixed to said groove is positioned in a region S between the pipe ends,
The lead of the sensor through the cylindrical body from the lead wire insertion holes opened in the groove, it was pull out to the outside from the open end of the tube member,
It said grooves, sensor, and the lead wire insertion hole is provided on both sides of the diameter direction of the connecting member comprises a lead wire guide member having both ends fitted into the lead wire insertion holes of the both sides, respectively, the lead wire guide member is provided with a lead wire guide groove passing in the longitudinal direction, and having an opening to open the central portion of the lead wire guide groove in the tubing axis.

According to the ground insertion pipe of the present invention , since the connecting member for connecting the pipe material is a connecting member with a sensor, it is possible to detect the deformation amount when the ground insertion pipe inserted into the ground is deformed with high sensitivity. It becomes. That is, the sensor mounting portion of the connecting member with sensor is a groove, and the rigidity of the portion is lower than the rigidity of the pipe material, so that the stress applied to the entire ground insertion tube can be concentrated on the sensor mounting portion and inserted into the ground. It is possible to detect the amount of deformation when the ground insertion tube is deformed with high sensitivity.

Moreover, not only can it be detected with high sensitivity, but also the ground insertion tube inserted into the ground has been deformed by appropriately setting the outer diameter and thickness of the connecting member and the thickness of the groove or groove. It is possible to appropriately detect the amount of deformation at the time.
Moreover, since the sensor is affixed to the groove portion of the connecting member, the projecting height of the sensor is within the outer dimensions of the connecting member, and the sensor does not come into contact with the hole wall when the pipe material is inserted into the ground. Can be prevented from being damaged.
Moreover, since it is not necessary to make the pipe material used for an anchor into a special specification, it can be set as a simple and cheap structure.

Also, as a connecting member that connects the pipes that make up the ground insertion pipe, such as anchors, using a connecting member with a sensor attached, it is possible to construct a ground insertion pipe with a structure that can detect its own deformation. Property can be improved.
That is, when the sensor is attached to the pipe material itself, it is difficult to attach the sensor to the long pipe material, but the work to attach the sensor to the short connecting member is easy.
Also, in order to improve work efficiency, it is complicated and inconvenient for material management of construction to store a sensor on a plurality of long pipes in advance, but it is inconvenient in various points, but a short connection with a sensor attached. It is easy to store the members, the material management is also easy, and the workability is improved. Also, since pipes of various lengths may be used, it is complicated to manage the materials in advance by attaching the sensors to the pipes in this respect as well. Are the same regardless of the length of the pipe, so there is no such problem.
In order to detect the deformation of the ground, it must be clear where the sensor is attached in the length direction of the ground insertion pipe inserted into the ground. It may be unclear at which position in the length direction the sensor is attached. However, according to the present invention, since it is clear that the sensor is always attached to the connecting member, the position of the sensor is not obscured.

In addition, it is easy to make the rigidity of the part where the sensor is affixed appropriately lower than the rigidity of the pipe material, it is easy to increase the sensitivity of detecting the deformation amount of the pipe material, and the correspondence with the distortion of the pipe material is clarified Easy to do.

Further, since only set the lead wire guide member can be guided smoothly to the outside of the sensor leads affixed to the outer surface of the groove.
Further, when the pipe members on both sides are rigidly connected by the connecting member so as to abut against the lead wire guide member, the positional relationship of the pipe members on both sides with respect to the connecting member can be made accurate and always constant.

In the ground insertion pipe of one embodiment of the present invention, only the connection member with the pipe and the sensor is shown. (A) is a connection member with the sensor in the ground insertion pipe constituted by connecting the pipe with the connection member with the sensor. The front view which shows a part, (B) is AA sectional drawing of (A), (C) is the figure which showed only the pipe material in (A), (D) is a cross-sectional view of a pipe material. FIG. 1 is a front view showing a portion of a connecting member with a sensor in a ground insertion pipe of an embodiment of the present invention shown without omitting a lead wire, a lead wire guide member, and a lead wire guide pipe that are not shown in FIG. It is BB sectional drawing of FIG. It is the figure which expanded CC sectional drawing of FIG. The connection member main body of the connection member with a sensor in FIG. 2 is shown, (A) is a front view, (B) is DD sectional drawing of (A). FIGS. 2A to 4B show lead wire guide members in the radial direction of the pipe used in the sensor-equipped connecting member. FIG. 2A is a front view, FIG. 2B is a plan view, and FIG. It is EE sectional drawing. It is the perspective view of the lead wire guide member of FIG. 6, and is the figure which showed the lead wire guided together. FIGS. 2A and 2B show a lead wire guide member in the tube axis direction used for the sensor-equipped connecting member in FIGS. 2 to 4, wherein FIG. 2A is a front view and FIG. . FIG. 9 is a longitudinal cross-sectional view for explaining how to connect the lead wire guide member in the tube radial direction of FIGS. It shows the part of the connecting member with sensor in the ground insertion pipe constructed by connecting the pipes with the connecting member with sensor shown as a reference example , (A) is a longitudinal sectional view, (B) is F of (A). It is -F sectional drawing. It shows the part of the connecting member with sensor in the ground insertion pipe constituted by connecting the pipe with the connecting member with sensor shown as another reference example , (A) is a longitudinal sectional view, (B) is (I) It is GG sectional drawing of. Furthermore, it shows the part of the connecting member with sensor in the ground insertion pipe constructed by connecting the pipe members with the connecting member with sensor shown as another reference example , (A) is a longitudinal sectional view, and (B) is (I). HH sectional drawing of (), (c) shows the modification which provided the circumferential groove in the outer surface of a connection member. Furthermore, it shows the part of the connecting member with sensor in the ground insertion pipe constructed by connecting the pipe members with the connecting member with sensor shown as another reference example , (A) is a longitudinal sectional view, and (B) is (I). II) is a cross-sectional view taken along the line II, and FIG. Furthermore , it shows another reference example , and is a diagram for explaining the configuration of a sensor-attached IC tag that can wirelessly transmit the output of the sensor to a ground strain measuring device. (A) is a figure explaining the case where it applies to the anchor inserted in a slope for slope stabilization as an example of the usage aspect of the connection member with a sensor of this invention, (b) is a part of (a) FIG. It is a figure explaining the case where it applies to the anchor inserted in a tunnel excavation wall surface in order to increase the supporting force of a tunnel wall material as an example of the usage condition of the connection member with a sensor of this invention. It is a figure explaining the case where it applies to the foundation pile inserted in the ground of structures, such as a building or an abutment, as an example of the usage condition of the connection member with a sensor of this invention. It is a figure explaining the case where it applies to the tubular reinforcing bar embedded in parallel with a wall surface inside a dam or a dike as an example of the usage mode of the connection member with a sensor of the present invention. It is a figure explaining the case where it applies to the tubular reinforcing bar embedded in the inside of a retaining wall in parallel with a wall surface as an example of the usage condition of the connection member with a sensor of the present invention.

Hereinafter, a ground insertion pipe embodying the present invention will be described with reference to the drawings.

The ground insertion pipe of the present invention is a ground insertion pipe such as a tubular anchor to be inserted into the ground, and is configured by rigidly connecting a plurality of pipe members with a connecting member. At least some of the connecting members that connect the plurality of pipe members are connected by the connecting member with sensor of the present invention.
FIG. 1 shows only a pipe member and a connecting member with a sensor in a ground insertion pipe of one embodiment of the present invention, and illustration of a lead wire, a lead wire guide member and a lead wire guide pipe which will be described later is omitted. , (b) is a front view showing a portion of the sensor with the connection member 11 of the ground insertion tube 13, such as a tubular anchor connecting the tubing 2 the sensor with the connection member 11, (b) is a sectional view taken along a-a of (a) (C) is the figure which showed only the pipe material in (a), (d) is a cross-sectional view of a pipe material.
The connecting member with sensor (hereinafter, simply referred to as a connecting member in some cases) 11 is a hollow cylindrical body of the connecting member main body 15 , and a circumferential groove 16 is formed on the outer peripheral surface of the central portion in the longitudinal direction. Reference numeral 16a denotes a lead wire insertion hole to be described later.
The pipe member 2 connected by the connecting member 11 is a thick circular tube as shown in FIGS.
The connecting member 11 and the pipe member 2 are rigidly connected by, for example, screwing male screw portions formed at both ends of the pipe member 2 into female screw portions formed on the inner surface of the connecting member 11 . However, the structure of the rigid connection between the connecting member 11 and the pipe material 2 is not particularly limited.
Strain gauges (sensors) 8 for detecting deformation generated in the pipe material 2 are attached to both sides of the circumferential groove 16 of the connecting member 11 in the diameter direction. The strain gauge 8 may be protected from damage by covering with a resin or covering with a protective tape.
In this embodiment, the spacing S between the pipe ends of both sides of the tube 2 is smaller than the width W of the circumferential groove 16, and between the tube end region entirely circumferential groove 16 (refer to the region spacing S of the two pipe ends) The strain gauge 8 is included in the region, and the position of the strain gauge 8 is located in the tube end region S. However, the present invention is not limited to the above, and the relationship between the interval S and the width W may be a configuration in which even a part of each other wraps and the strain gauge 8 is positioned within the wrapping range.

In the present invention, the rigidity of the portion of the connecting member 11 to which the sensor 8 is attached is set lower than the rigidity of the tube material 2. In this embodiment, the rigidity of the peripheral groove 16 portion of the connecting member 11 is set to be lower than that of the tube material 2. In this type of ground insertion pipe in which a plurality of pipe members are rigidly connected by a connecting member, the rigidity of the connecting member portion is generally higher than the rigidity of the pipe material. However, in the present invention, the connecting member 11 is provided with a portion having a lower rigidity than the pipe material 2. It is done.
In general, the bending strain ε generated when a bending moment M acts on a pipe having an outer diameter D and an inner diameter d and a Young's modulus E is:
ε = M · 32E / π (D ³ −d ³ )
Therefore, if the outer diameter D ₂ and the inner diameter d _{2 of} the pipe material 2 are determined, the outer diameter D ₁ and the inner diameter d ₁ in the circumferential groove 16 of the connecting member 11 are adjusted, so that the connection is made from the strain ε ₂ of the pipe material 2. it is possible to increase the strain epsilon ₁ part of the circumferential groove 16 of member 11. Therefore, the deformation amount of the tube material 2 can be detected with high sensitivity.
Moreover, not only can it detect with high sensitivity, but it can adjust to required intensity | strength by setting the outer diameter of a connection member, plate | board thickness, the plate | board thickness of a groove part, etc. suitably.
Moreover, since the strain gauge 8 is affixed to the circumferential groove 16 in the connecting member 11 , the protruding height of the sensor falls within the outer dimensions of the connecting member, and contacts the hole wall when inserting the pipe 2 into the ground. It is possible to prevent the strain gauge 8 from being damaged.
Moreover, since it is not necessary to make the pipe material used for an anchor into a special specification, it can be set as a simple and cheap structure.

In addition, when using a connecting member 11 to which a sensor is attached as a connecting member for connecting a pipe material constituting the ground insertion pipe such as an anchor, when constructing a ground insertion pipe having a structure capable of detecting its own deformation amount. Workability can be improved.
That is, when the sensor is attached to the pipe material itself, it is difficult to attach the sensor to the long pipe material, but the work to attach the sensor to the short connecting member is easy.
Also, in order to improve work efficiency, it is complicated and inconvenient for material management of construction to store a sensor on a plurality of long pipes in advance, but it is inconvenient in various points, but a short connection with a sensor attached. It is easy to store the members, the material management is also easy, and the workability is improved. Also, since pipes of various lengths may be used, it is complicated to manage the materials in advance by attaching the sensors to the pipes in this respect as well. Are the same regardless of the length of the pipe, so there is no such problem.
In order to detect the deformation of the ground, it must be clear where the sensor is attached in the length direction of the ground insertion pipe inserted into the ground. It may be unclear at which position in the length direction the sensor is attached. However, according to the present invention, since it is clear that the sensor is always attached to the connecting member, the position of the sensor is not obscured.
In addition, since the entire tube end region S is included in the circumferential groove region W and the position of the sensor is positioned in the tube end region S, the rigidity of the portion where the sensor is attached is more than the rigidity of the tube material. It is easy to appropriately reduce it, and it is easy to increase the sensitivity of detecting the amount of deformation of the tube material, and it is easy to clarify the correspondence with the strain of the tube material.

FIG. 2 shows a ground insertion pipe 13 according to an embodiment of the present invention shown without omitting a lead wire, a lead wire guiding member and a lead wire guiding pipe which are not shown in FIG. The front view which shows the part of the connection member 11 with a sensor of the ground insertion pipe | tube 13 which connected the pipe material 2 with the member 11, FIG. 3 is BB sectional drawing of FIG. 2, FIG. 4 is CC sectional drawing which expanded FIG. It is. FIG. 5 shows the connecting member body 15 of the connecting member 11 with sensor in FIG. 2, (A) is a front view, and (B) is a DD sectional view of (A).
The connecting member 11 with sensor has a connecting member main body 15 that is a hollow cylindrical body as described above , and a circumferential groove 16 is formed on the outer peripheral surface of the central portion in the longitudinal direction. In the circumferential groove 16, the aforementioned lead wire insertion holes 16 a into which a lead wire guide member 17 described later is fitted are formed on both sides in the diameter direction.
The tube material 2 is a thick circular tube as described above .
As described above , the connecting member 11 and the pipe member 2 are rigidly connected by screwing the male screw portions formed at both ends of the pipe member 2 into the female screw portions formed on the inner surface of the connecting member 11.
Strain gauges (sensors) 8 for detecting deformation generated in the pipe material 2 are attached to both sides of the circumferential groove 16 of the connecting member 11 in the diameter direction.
The pipe ends of the pipe materials 2 on both sides abut against the lead wire guide members 17 having both ends fitted in the lead wire insertion holes 16a on both sides in the diameter direction, and are separated by an interval S corresponding to the thickness of the lead wire guide members 17. doing. As described above, the interval S between the tube ends of the pipes 2 on both sides is smaller than the width W of the circumferential groove 16, and the entire region between the tube ends (refers to the region S between the tube ends) is the region of the circumferential groove 16. And the position of the strain gauge 8 is located in the tube end-to-end region S.
The portion of the circumferential groove 16 in the connecting member 1 is lower in rigidity than the tube material 2 as described above .

  The lead wire 9 of the strain gauge 8 is drawn into the connecting member 11 through a lead wire guide groove 17a (described later) of the lead wire guide member 17 fitted in the lead wire insertion hole 16a. It passes through the lead wire guide pipe 19 attached to the central portion of the lead wire guide member 17, passes through the tube material 2, is drawn out from the open end of the tube material 2, and is connected to the strain measuring device.

According to the sensor-equipped connecting member 11, as described above, when the ground insertion tube 13 inserted into the ground is deformed, the amount of deformation can be detected with high sensitivity. deformed ground insertion tube inserted in the ground not only the can be detected to detect the amount of deformation it is possible to properly perform the time resulting effects such as can be obtained.
Further, the lead wire 9 is drawn into the connecting member 11 through the lead wire guide groove 17 a of the lead wire guide member 17, passes through the lead wire guide pipe 19, passes through the tube material 2, and opens from the open end of the tube material 2 to the outside. Therefore, there is no possibility that the strain gauge 8 is damaged by contact with the hole wall when the pipe member 2 is inserted into the ground.

  As shown in FIGS. 6 and 7, the lead wire guide member 17 includes a lead wire guide groove 17a extending in the longitudinal direction on the bottom surface side of the elongated rectangular parallelepiped member as a whole, and the center of the lead wire guide groove 17a. It has an open part 17b which opens the part in the pipe material axial direction. The open part 17b is formed by a trapezoidal recess formed in the center (recess = open part 17b). The lead wire guiding groove 17a has a groove bottom surface 17a 'inclined upward toward the center so that the lead wire 9 can be smoothly guided.

As shown in FIGS. 8 and 9, the lead wire guide pipe 19 has a structure in which a conical portion 19 b that matches the trapezoidal shape of the recess 17 b of the lead wire guide member 17 is fixed to the lower end portion of the pipe 19 a. The conical portion 19b has a conical hole 19b 'opposite to the conical surface of the conical portion 19b.
When the conical portion 19b of the lead wire guide pipe 19 is fixed to the recess 17b of the lead wire guide member 17, the lead wire 9 including the lead wire guide groove 17a, the conical hole 19b ', and the pipe 19a is guided. A passage is formed.
As a means for fixing the conical portion 19b of the lead wire guide pipe 19 to the recess 17b of the lead wire guide member 17, various structures such as screwing with a taper screw can be adopted.
The lead wire 9 of the strain gauge 8 affixed to the outer surface of the circumferential groove 6 of the connecting member 11 passes through the lead wire guide groove 17a of the lead wire guide member 17, passes through the conical hole of the conical portion 19b of the lead wire guide pipe 19. It is guided into the pipe 19a through 19b ', passes through the inside of the pipe material 2, and is connected to an external strain measuring device.

Sensor-provided connecting member 21 in the ground insertion tube 23 shown in FIG. 10 as reference example, among those who were use the connecting member body 25 of the solid cylindrical body.
A circumferential groove 26 is formed on the outer peripheral surface of the solid connecting member body 25, and the strain gauge 8 is attached to the circumferential groove 26.
The lead wire 9 is guided to the ground along the outer surface of the pipe material 2 in the illustrated example. The lead wire 9 is provided with some protective coating as described above. Or although illustration is abbreviate | omitted, the longitudinal groove for lead wire penetration may be formed in the outer surface of the connection member main body 25, and you may make it lead a lead wire to the ground through the inside of the pipe material 2 through this longitudinal groove.

The sensor with the connecting member 31 in the ground insertion tube 33 shown in FIG. 11 as a reference example is one in which had use the connecting member body 35 of the hollow cylindrical body which is connected rigidly fitted to the inside of the tube 2.
A circumferential groove 36 is formed on the outer peripheral surface of the connecting member main body 35, and the strain gauge 8 is attached to the circumferential groove 36.
Although not shown in the drawing, the lead wire is guided to the ground along the outer surface of the tube material 2 as in FIG. 10, or a lead wire insertion hole is formed in the circumferential groove 36, and the lead wire insertion hole is formed from the lead wire insertion hole. It is good to put in the inside of the connection member 31, and to guide to the ground through the inside of the pipe material 2.

Further, FIG. 12 (b) as a reference example, the sensor-provided connecting member 41 in the ground insertion tube 43 shown in (b), the connecting member body 45 of the hollow cylindrical body which is fitted rigidly connected to the inner of the tube 2 with use, forming a circumferential groove 46 on the inner circumferential surface of the connecting member body 45, but was pasted a strain gauge 8 to the circumferential groove 46.
In this case, the connecting member 41 is short to some extent, and it is necessary to devise to attach the strain gauge 8 to the inner surface of the connecting member 41, but the lead wire 9 can be passed through the pipe material 2 as it is.
Further, also a connecting member 41 ', the circumferential groove 46' of FIG. 12 (c) as a reference example is provided with a on the outer surface of the connecting member body 45 '. The strain gauge 8 is attached to a position corresponding to the circumferential groove 4 on the inner surface of the connecting member main body 45. In this case, since there is no step on the inner surface of the cylinder to which the strain gauge 8 is attached, the operation of attaching the strain gauge 8 is slightly easier than in the case of FIGS.
As shown in FIGS. 10, 11, and 12, when the connecting member is inserted and fixed inside the tube material 2, a male screw may be formed on the outer surface of the connecting member and a female screw may be formed on the inner surface of the end portion of the tube material 2.

Further, FIG. 13 as a reference example (a), the sensor-equipped joint member 51 in the ground insertion tube 53 shown in (b), the connecting member body 55, as well as the connecting member main body 5 in FIG. 1, the outer surface of the tube 2 The cover 56 is rigidly connected and has a peripheral groove 56 on the outer peripheral surface, but the strain gauge 8 is attached to the inner surface of the connecting member main body 55.
Also in this case, it is necessary to devise to attach the strain gauge 8 to the inner surface of the connecting member 51, but the lead wire 9 can be passed through the pipe material 2 as it is.
Similarly, a connecting member 51 ′ shown in FIG. 13C as a reference example has a circumferential groove 56 ′ provided on the inner surface of the connecting member main body 55 ′, and the strain gauge 8 is attached to the circumferential groove 56 ′.

Instead the output of the strain gauge 8 configured to transmit on the ground of the strain measuring device leads, in Figure 14 shows as a reference example, the sensor-equipped IC tag 60 which is connected to the strain gauge 8 in IC tag 61, the strain gauge 8 outputs in the radio is obtained by a structure for transmitting to the ground of the strain measuring device 69.
The IC tag 60 includes a power supply unit 62, a CPU 64, and a memory 65, and includes a gauge output processing unit 63 that performs processing such as A / D conversion for converting the output of the strain gauge 8 into a digital value, a transmission / reception circuit 66, an antenna unit 67, and the like. Consists of.
In response to the radio signal sent from the IC tag reader (or reader / writer) 68, the sensor-attached IC tag 60 transmits the output of the strain gauge 8 as a digital signal from the antenna unit 67 to the IC tag reader 68, and measures the strain on the ground. The device 69 measures the distortion generated in the connecting member by the signal from the IC tag reader 68.
The power supply unit 62 may be a battery, but may be a battery that can be charged with a charging radio wave sent from an external device on the ground. In addition, it is possible to provide a capacitor so that power can be supplied by radio waves from an external device.

FIG. 15 is a diagram for explaining a case where the connecting member with a sensor of the present invention is applied to an anchor (ground insertion pipe) 71 inserted into a slope for stabilizing the slope. In addition, in the following FIGS. 15-19, the connection member with a sensor is shown with the code | symbol 1. FIG.
FIG. 15A schematically shows a slope 72 on which the slope stabilization method is applied. FIG. 2B is an enlarged view of one anchor portion. S indicates a slip line.
In the slope stabilization method, a large number of anchors 71 are inserted on the slope so as to reach a predetermined depth of the stable ground, a bearing plate 73 is attached to the head of each anchor 71, and the bearing plate 73 is pulled against the anchor 71. Tighten to apply, and give support pressure to the ground. The anchor 71 and the bearing plate 73 exhibit resistance to the movement of the ground, and the degree of movement of the unstable soil mass on the slope can be reduced.
In general, the anchor 71 is formed by connecting a hollow lock bolt (tube material) having a length of, for example, 1.5 m with a coupler (connecting member) with a screw formed on the outer peripheral surface thereof. In the case of self-drilling type lock bolts, a bit is provided at the tip, and it is inserted while making a hole in the ground with the bit at the tip, and if necessary, the lock bolt is connected with a coupler to reach the predetermined depth of the stable ground. Insert into. After inserting the lock bolt, mortar is filled in the gap between the hole and the lock bolt.
When the ground moves, the anchor (ground insertion pipe) 71 is deformed as shown by the broken line, the pipe material constituting the anchor 71 is deformed, and the connecting member 1 is also deformed.
The strain generated in the connecting member 1 can be detected by the strain gauge 8 to detect the deformation state of the pipe material, and the deformation of the slope can be known.
As a result, it is possible to redevelop the slope and implement further countermeasures against the slope, and it is also possible to issue a warning of slope failure.
Since it is a member (anchor) used for slope stabilization and detects slope deformation, it is more efficient as a means to enable slope deformation detection than when a slope deformation detector is installed separately. The construction is easy and the cost is low.

FIG. 16 is a diagram for explaining a case where the connecting member with a sensor of the present invention is applied to an anchor 81 inserted into a tunnel excavation wall surface in order to increase the supporting force of the tunnel wall material in tunnel construction. The anchor (ground insertion pipe) 81 is formed by rigidly connecting a plurality of pipes with the connecting member with sensor 1 of the present invention. In the figure, reference numeral 82 denotes a tunnel wall surface such as a culvert. The broken line schematically shows the wall surface when the tunnel wall surface is deformed. The arrow indicates the earth pressure acting on the wall material forming the tunnel wall surface, and the solid line indicated by 83 indicates the earth pressure distribution.
In a constructed tunnel, it is difficult to visually confirm the amount of displacement and deformation of the tunnel due to the influence of earth pressure, but as an anchor inserted into the tunnel excavation wall in order to increase the bearing capacity of the tunnel wall material, When the anchor 81 in which the pipe member is connected with the connecting member 1 with the sensor according to the invention is used, the displacement amount and deformation state of the tunnel due to the influence of earth pressure can be determined while the role of the anchoring force is enhanced. Since it can be detected from 1), it is possible to prevent accidents by sending an alarm in the event of a danger, and it is possible to carry out repairs by early detection of parts with insufficient support or broken parts. , Improve safety.

FIG. 17 is a diagram for explaining a case where the connecting member with a sensor of the present invention is applied to a foundation pile inserted into the ground of a structure such as a building or an abutment. In the figure, 91 is a foundation pile, 92 is a foundation slab, 93 is a part of a structure such as a building or a bridge. 94 is the ground. P ₁ and P ₂ indicate fluctuating loadings that take into account wind pressure, earthquakes, and the like. The solid lines of the waveforms along the arrows P ₁ and P ₂ indicate that the overload varies due to an earthquake or wind pressure.
When the ground where the structure is installed changes due to its own weight, wind pressure, earthquake, rain, etc. (deformation, settlement, liquefaction, etc.), bending strain and axial strain occur in the foundation pile. If the foundation pile 91 which connected the pipe material with the connection member 1 with a sensor of this invention is used as a foundation pile of such a structure, while playing the original role as a foundation pile, the connection part (connection member 1) of a foundation pile. ) Can detect the strain of the foundation pile and can detect changes in the ground of the structure at an early stage, and can take countermeasures at an early stage.

FIG. 18 is a view for explaining a case where the connecting member with a sensor of the present invention is applied to a tubular reinforcing bar 101 embedded in a dam or embankment 102 in parallel with the wall surface 103. The arrow P indicates the water pressure, and the solid line indicated by 104 indicates the water pressure distribution. The broken line of the waveform schematically shows that the water level fluctuates, and the water pressure acting on the wall surface 103 fluctuates.
FIG. 19 is a view for explaining a case where the connecting member with sensor 1 of the present invention is applied to a tubular reinforcing bar 111 embedded in the retaining wall 112. The arrow P indicates the earth pressure, and the solid line indicated by 114 indicates the earth pressure distribution.
When tubular rebars 101 and 111 in which pipe members are connected by the connecting member with sensor 1 of the present invention are used as tubular rebars embedded in the interior of a dam, embankment or retaining wall, the original function as a tubular rebar is achieved. However, the deformation of the dam, levee and retaining wall can be detected from the connecting portion (connecting member 1) of the tubular rebars 101 and 111, and the deformation status of the dam, levee and retaining wall can be grasped, and measures can be taken at an early stage. be able to.

In each of the above-described embodiments, the ground insertion tube (anchor, foundation pile, tubular rebar, etc.) having a standard length or a specified length is not limited to being connected by a connecting member with a sensor, but the ground insertion tube can be placed at an arbitrary position. The deformation | transformation of arbitrary positions can be measured by cut | disconnecting and connecting between the cutting | disconnection edge parts with the connection member with a sensor of this invention.
In the embodiment shown in FIGS . 1 to 9 , the groove for attaching the sensor is a circumferential groove, but it is not necessarily a circumferential groove. It may be a groove that can be said to be a recess that is at least wide enough to attach the sensor. Moreover, the groove | channel of the width which can provide a sensor and a lead wire penetration hole should just be sufficient.

1, 11 Connecting member with sensor (connecting member)
2 Pipe material
13 ground insertion pipe (anchor, foundation pile, tubular rebar, etc.)
15 connecting member body
16 circumferential grooves
8 Strain gauge (sensor)
9 Lead wire S Spacing between pipe ends on both sides W Circumferential groove width 16a Lead wire insertion hole 17 Lead wire guide member 17a Lead wire guide groove 17a 'Groove bottom surface 17b Recessed portion (open portion)
19 Lead wire guide pipe 19a Pipe 19b Conical part 19b 'Conical hole 71 Anchor (ground insertion pipe)
72 slope 81 anchor (ground insertion pipe)
82 Tunnel wall 91 Foundation pile (ground insertion pipe)
92 Foundation slab 101 Tubular rebar (ground insertion pipe)
102 Dam or dike 111 Tubular rebar (ground insertion pipe)
112 Retaining wall

Claims (1)

A ground insertion pipe that is configured by rigidly connecting a plurality of pipe members with a connection member and inserted into the ground,
The connecting member is a hollow cylindrical body, the sensor according to the strain gauge for the rigidity of the groove portion is lower than the rigidity of the tube member, to detect the deformation generated in the tube member by forming a groove on its outer peripheral surface Affixed to the groove ,
Together with the tube material of the connecting portion sides are connected rigidly by the connecting member in a state where the tube end is separated from each other, viewed from the tubing side and the groove area W of the connecting member and the region S between the spaced pipe ends positional relation matches some or all, and the position of the sensor affixed to said groove is positioned in a region S between the pipe ends,
The lead of the sensor through the cylindrical body from the lead wire insertion holes opened in the groove, it was pull out to the outside from the open end of the tube member,
It said grooves, sensor, and the lead wire insertion hole is provided on both sides of the diameter direction of the connecting member comprises a lead wire guide member having both ends fitted into the lead wire insertion holes of the both sides, respectively, the lead wire guide member is provided with a lead wire guide groove passing in the longitudinal direction, ground insertion tube and having an opening to open the central portion of the lead wire guide groove in the tubing axis.

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