JP5659386B2 - Inclinometer installation method and inclination measuring device - Google Patents

Description

  The present invention relates to an inclinometer installation method and an inclination measuring device.

  In the construction of a mountain tunnel, if the state of the natural ground in front of the face can be grasped, excavation can be carried out more safely and more economically.

Advanced boring and underground elastic exploration are common methods for measuring ground conditions during tunnel construction.
However, since advanced boring and underground mine exploration work in the vicinity of the face, it is necessary to interrupt the tunnel excavation work at the time of measurement, which may hinder the shortening of the work period.

  For this reason, the present applicant, as a natural ground condition prediction method that can be carried out as part of daily construction management, measures the angle of inclination in the tunnel axis direction with an inclinometer installed in the tunnel mine, so that Has been developed (Japanese Patent Application No. 2010-145208).

  In addition, as an inclination measuring device that can be installed in a tunnel mine, for example, as shown in Patent Document 1, an inclination angle of a detection rod arranged so as to connect two fixed points installed in the mine is measured. As shown in Patent Document 2, a pipe is inserted into an observation hole drilled downward, an inclinometer is disposed at the bottom of the pipe, and the pipe is embedded with dry dredged sand or the like. .

JP 2005-181176 A JP 2001-116548 A

  In the inclination measuring device described in Patent Document 1, it is necessary to fix a long detection rod to the sprayed concrete surface of the tunnel. For the purpose of predicting the ground ahead of the face, when using the above-mentioned inclination measuring device in the immediate vicinity of the face, a metal rod is attached to the detection rod exposed from the shotcrete surface to the inside of the mine to protect the device from flying stones caused by blasting. It is necessary to cover with. Since this protective metal fitting has a relatively large shape, it takes time for installation work, which may hinder tunnel excavation work.

In the measurement method described in Patent Document 2, an inclinometer is installed on the work vehicle traveling surface, which may hinder tunnel excavation work. In addition, since the inclinometer is buried at the bottom of the observation hole, fine adjustment during inclinometer installation may be difficult.
In addition, it is difficult to install the inclinometer of Patent Document 2 upward at the top of the tunnel because dry dredged sand filled in the pipe may flow out.

  An object of the present invention is to solve the above-mentioned problems and to provide an inclinometer installation method and an inclination measurement device that can be installed in a short time so as not to affect the excavation work of the tunnel. The challenge is to propose.

  In order to solve the above problems, an inclinometer installation method of the present invention includes a fixing part having a retaining member and a protective member fixed to the retaining member, a storage case detachably fixed to the fixing part, and A preparation step of preparing an inclination measuring device including an inclinometer stored in the storage case, a drilling step of drilling a device insertion hole in a wall surface of a tunnel, and an inclination measuring device in the device insertion hole And an insertion step of hooking the retaining member on the hole wall of the device insertion hole, and an injection step of injecting a filler into the gap between the hole wall of the device insertion hole and the inclination measuring device. It is characterized by that.

According to such an inclinometer installation method, it is possible to easily install an inclinometer, and it is not necessary to interrupt the tunnel excavation work for a long period of time.
Moreover, since the filler is injected between the hole wall and the device, it is possible to prevent the device from being displaced due to vibrations or the like accompanying excavation work.
Furthermore, since the measurement unit is detachably fixed to the fixing unit, the measurement unit can be diverted to another position, which is economical.

  If an exhaust tube is piped from the opening of the device insertion hole to the tip of the fixing unit in the insertion step, and the air in the device insertion hole is exhausted through the exhaust tube in the injection step, the upward direction Even when the tilt measuring device is installed in the device insertion hole drilled in, the device can be more reliably filled with the filler and the tilt measuring device can be fixed to the hole wall. .

  The tilt measuring device of the present invention is a tilt measuring device disposed in a device insertion hole formed in a tunnel, and includes a fixing unit fixed in the device insertion hole, and a detachable attachment to the fixing unit. The fixing unit includes a retaining member secured in the device insertion hole and a protective member secured to the retaining member, and the measuring unit includes the measuring unit It has a storage case housed in a protective member and an inclinometer stored in the storage case.

Since the inclination measuring device includes a retaining member, it can be easily installed in the device insertion hole.
Further, since the measurement unit is detachably fixed to the fixing unit, the measurement unit can be diverted.

  If the storage case is detachably connected to the retaining member, and the protective member covers the storage case and covers the connecting portion between the storage case and the retaining member, the storage case and the joint portion Is cut off from the filler by the protective member, so that the storage case can be easily attached and detached.

If the male screw part is formed in the retaining member, the female screw part is formed in the storage case, and the female screw part is screwed to the male screw part, the measuring part is rotated. Thus, it can be easily detached from the fixing portion.
Moreover, if the hexagon head is formed in the base end part of the said storage case, a measurement part can be rotated using a wrench.

  If the protective member has a cylindrical cover sheet, the tilt measuring device can be configured at a relatively low cost. Although the measurement unit is fixed by the pressure of the filler, it is easily removed because it is cut off from the filler by the protective member.

  If there is a spacer that shields the gap between the device insertion hole and the storage case at the hole of the device insertion hole, all of the inclination measuring device enters the device insertion hole and cannot be recovered (removed). Can be prevented.

  According to the inclinometer installation method and the inclination measurement apparatus of the present invention, it is not necessary to interrupt the tunnel excavation work for a long period of time, and the inclinometer can be easily and accurately installed.

It is sectional drawing which shows the inclination measuring apparatus which concerns on embodiment of this invention. (A) is a front view which shows a retaining member, (b) is a front view which shows a protection member, (c) is a perspective view which shows a measurement part, (d) is a perspective view which shows a spacer. (A)-(c) is sectional drawing which shows each step | level of the inclinometer installation method. It is sectional drawing which shows the other form of an inclination measuring apparatus.

Embodiments of the present invention will be described with reference to the drawings.
In this embodiment, an inclination measuring device 10 and an inclinometer installation method used when measuring an inclination angle in the tunnel axis direction with an inclinometer 50 installed in a tunnel 1 will be described.

As shown in FIG. 1, the tilt measuring device 10 is disposed in a device insertion hole 2 formed in the wall surface of the tunnel 1 and measures the tilt angle in the tunnel axis direction.
In the present embodiment, a case where the inclination measuring device 10 is disposed in the device insertion hole 2 formed at the top of the tunnel 1 will be described.

  The inclination measuring device 10 includes a fixing unit 11 that is fixed inside the device insertion hole 2, a measurement unit 12 that is detachably fixed to the fixing unit 11, and a spacer 13 that is disposed in the hole of the device insertion hole 2. And.

  The fixing unit 11 includes a retaining member 20 and a protection member 30.

The retaining member 20 is a member that is hooked on the hole wall of the device insertion hole 2.
As shown in FIG. 2A, the retaining member of the present embodiment includes a male screw portion 21, a latching portion 22, and nuts 23, 23, and 24.

  The male screw portion 21 is a rod-like member having a threaded outer peripheral surface, and is constituted by a so-called dimensioning bolt. In addition, the material which comprises the external thread 21 is not limited. Moreover, the shape dimension of the external thread part 21 is not limited.

  The latching part 22 is comprised by the cylindrical part 22a and the blade | wing part 22b, 22b, ....

The cylindrical portion 22a is formed of a cylindrical member, and a plurality of blade portions 22b, 22b,. The male screw portion 21 is inserted through the cylindrical portion 22a.
Although the material of the cylindrical part 22a is not limited, In this embodiment, it is comprised with the steel pipe.

The plurality of blade portions 22b, 22b, ... are formed radially from the lower end portion of the cylindrical portion 22a obliquely downward.
In the present embodiment, the case where four blade portions 22b are formed will be described, but the number of blade portions 22b is not limited. Further, the shape of the blade portion 22b is not limited.

The plurality of blade portions 22b, 22b,... Are formed such that the distance between them increases toward the lower side (the inner side of the tunnel).
By doing so, the blade portion 22b is inserted without resistance when inserted into the device insertion hole 2, and is latched on the hole wall of the device insertion hole 2 when a pulling force acts on the retaining member 20.

The latching portion 22 is fixed by nuts 23 and 23 screwed to the male screw portion 21 at the top and bottom of the cylindrical portion 22a.
The nut 24 is screwed to the male screw portion 21 for positioning the measuring unit 12 (storage case 40).

  The arrangement and number of nuts 23 and 24 are not limited. Further, the nuts 23 and 24 may be disposed as necessary, and may be omitted depending on the fixing method of the latching portion 22 and the measuring portion 12.

The protection member 30 is fixed to the retaining member 20.
As shown in FIG. 1, the protection member 30 covers the measurement unit 12 (storage case 40) and also covers a connection portion between the measurement unit 12 and the retaining member 20.

  As shown in FIG. 2B, the protection member 30 of the present embodiment is configured by a cylindrical cover sheet 31 and a fastener 32.

The cover sheet 31 is made of a synthetic resin, and is fixed to the male screw portion 21 of the retaining member 20 with a fastener 32 in a state where one opening portion is depressed.
The structure of the fastener 32 is not limited and what is necessary is just to use what is called a fastener and a binding wire.

  As shown in FIG. 1, the measurement unit 12 includes a storage case 40 and an inclinometer 50.

The storage case 40 is made of a cylindrical member.
An inclinometer 50 is stored inside the storage case 40.

As shown in FIG. 2C, the storage case 40 has a reduced diameter at the tip. A female screw portion 41 that can be screwed to the male screw portion 21 is formed at the tip portion.
Further, the lower end surface of the storage case 40 is open.

  The storage case 40 is detachably connected to the retaining member 20. In the present embodiment, as shown in FIG. 1, the female screw portion 41 is screwed onto the male screw portion 21 of the retaining member 20 and is tightened with the nut 24, thereby being connected to the retaining member 20. Is released from the retaining member 20 by loosening.

  The inclinometer 50 includes an inclinometer body (not shown) and a hexagonal head 51 as shown in FIG.

  The inclinometer body is an electronic device (sensor) that measures an inclination angle, and is disposed inside the storage case 40. The inclinometer body is fixed to the hexagon head 51.

  The hexagonal head 51 is integrally fixed to the inner space side (base end of the measuring unit) of the storage case 40.

  By rotating the hexagon head 51 using a wrench or the like, the storage case 40 rotates and the storage case 40 can be detached from the retaining member 20.

  As shown in FIG. 1, the spacer 13 shields the gap between the device insertion hole 2 and the storage case 40 at the hole of the device insertion hole 2.

  As shown in FIG. 2 (d), the spacer 13 is formed with an insertion hole 13a for inserting the storage case 40 at the center, and a plurality of through holes 13b, 13b around the insertion hole 13a. Is formed.

  The spacer 13 of the present embodiment is configured by a disc having an outer diameter larger than the inner diameter of the device insertion hole 2 and the outer width of the hexagon head 51. The shape of the spacer 13 is not necessarily circular, and may be rectangular, for example.

  The diameter of the insertion hole 13 a is larger than the outer diameter of the storage case 40 and smaller than the outer width of the hexagon head 51.

In the present embodiment, two through holes 13b and 13b are formed so as to face each other with the insertion hole 13a interposed therebetween.
The interval between the through holes 13b is shorter than the diameter of the device insertion hole 2, and when the spacer 13 is installed at the hole of the device insertion hole 2, the inner space of the device insertion hole 2 and the inner space of the tunnel 1 through the through hole 13b. And communicate. The number and arrangement of the through holes 13b are not limited.

  The inclination measurement device 10 is fixed in the device insertion hole 2 by filling the filler 3 between the inclination measurement device 10 and the hole wall of the device insertion hole 2.

  In the present embodiment, the exposed portion of the inclination measuring device 10 (the portion protruding toward the inner space of the tunnel 1) is covered with the protective cover 4. The protective cover 4 protects the exposed portion of the inclination measuring device 10 from rocks and the like scattered during tunnel excavation. The protective cover 4 is opened on the wellhead side of the tunnel 1.

  The configuration of the protective cover 4 is not limited. Moreover, in this embodiment, although the protective cover 4 is being fixed by the anchor 4a, the fixing method of the protective cover 4 is not limited.

Next, an inclinometer installation method for installing the inclination measurement device of the present embodiment in a tunnel mine will be described.
The inclinometer installation method includes a preparation process, a drilling process, an insertion process, and an injection process.

The preparation step is a step of preparing the inclination measuring device 10 as shown in FIG.
In the preparation step, first, the protective member 30 is fixed to the retaining member 20 and the inclinometer 50 is fixed to the storage case 40. Further, the exhaust tube 70 or the injection tube 71 is inserted into the through holes 13 b and 13 b of the spacer 13. The distal ends of the exhaust tube 70 and the injection tube 71 are positioned near the distal end (upper end) of the inclination measuring device 10.

Next, the measuring unit 12 is fixed to the fixing unit 11 to form the tilt measuring device 10.
The storage case 40 is inserted into the insertion hole 13 a of the spacer 13, and the spacer 13 is disposed between the blade portion 22 b and the hexagon head 51.

The drilling step is a step of drilling the device insertion hole 2 in the wall surface of the tunnel 1.
As shown in FIG. 3 (b), the device insertion hole 2 is formed by drilling the spray concrete 1a of the tunnel 1 and by cutting a natural ground G on the back side of the spray concrete 1a for a predetermined length.

The insertion step is a step of inserting the inclination measuring device 10 into the device insertion hole 2 and hooking the retaining member 20 on the hole wall of the device insertion hole 2.
As shown in FIG. 3C, the retaining member 20 is disposed in the natural ground G.

  When the inclination measuring device 10 is inserted into the device insertion hole 2, the exhaust tube 70 and the injection tube 71 are piped into the device insertion hole 2. The exhaust tube 70 and the injection tube 71 are piped between the protection member 30 and the inner wall surface of the device insertion hole 2.

  Since the tip of the tilt measuring device 10 is hooked to the natural ground by the hook 22, the installation angle of the tilt measuring device 10 is also finely adjusted using this as a fulcrum. Fine adjustment of the installation angle of the inclination measuring device 10 may be performed in a state where, for example, a level is applied to the base end of the inclination measuring device 10.

An injection | pouring process is a process of inject | pouring the filler 3 (refer FIG. 1) into the clearance gap between the hole wall of the apparatus insertion hole 2, and the inclination measuring apparatus 10. FIG.
At this time, the injection operation is performed in a state where the inclination measuring device 10 is supported so that the installation angle of the inclination measuring device 10 is not shifted.

Injection of the filler 3 is performed from the tip (upper end) side of the device insertion hole 2 through the injection tube 71.
The injection tube 71 is gradually pulled out from the device insertion hole 2 as the filler 3 is injected.

  As the filler 3 is injected, the air in the device insertion hole 2 is exhausted by the exhaust tube 70, thereby preventing air from remaining in the device insertion hole 2.

  In the present embodiment, urethane foam is used as the filler 3, but the material constituting the filler 3 is not limited.

  When the filler 3 is cured, the inclination measuring device 10 is fixed to the device insertion hole 2.

  According to the inclinometer 10 and the inclinometer installation method of the present embodiment, since the inclinometer 50 can be easily installed in the tunnel 1 of the tunnel 1, the excavation work of the tunnel is interrupted for a long time by the inclinometer installation work. There is nothing to do.

  Moreover, it can fix to a hole wall reliably by inject | pouring the filler 3 adjusting the installation angle of the inclinometer 50. FIG.

Since the measuring unit 12 is detachably fixed to the fixing unit 11, the measuring unit 12 can be diverted to another position, which is economical.
In addition, since the measurement unit 12 and the joint between the fixing unit 11 and the measurement unit 12 are covered with the protective member 30 and cut off from the filler 3, the measurement unit 12 can be easily detached from the fixing unit 11. is there.

  The fixing unit 11 and the measuring unit 12 are joined by screwing the male screw unit 21 and the female screw unit 41. Therefore, when removing the measuring unit 12 from the fixing unit 11, a tool such as a wrench is used. Thus, it can be easily performed by simply rotating the hexagon head 51.

  In other words, the inclination measuring device 10 can be easily removed. Therefore, the measuring unit 12 is removed from the inclination measuring device 10 that is no longer changed in the inclination angle by moving away from the face as the tunnel 1 is dug. Thus, it can be diverted (rearranged) near the face.

  Further, since the apparatus insertion hole 2 is exhausted by the exhaust tube 70, air can be prevented from remaining inside the apparatus insertion hole 2 that has been drilled upward, and the quality of the tunnel does not deteriorate.

Since the inclination measuring device 10 is only inserted into the device insertion hole 2 and the retaining member 20 is hooked on the natural ground G and prevented from coming off, it is possible to prevent unintentional dropping of the inclination measuring device. it can.
Further, the fine adjustment of the installation angle of the inclinometer 50 can be easily performed by rotating the retaining member 20 around the fulcrum.

  The measuring unit 12 is cut off from the filler 3 by the protective member 30 (cover sheet 31), but the pressure of the filler 3 acts on the measuring unit 12 because the cover sheet 31 has a sheet shape. That is, the measuring unit 12 is fixed by the pressure of the filler 3.

  The filling material 3 passes through the radially formed blade portions 22b, 22b,... And fills the inside of the device insertion hole 2, so that the inclination measuring device 10 can be stably fixed.

  Since the spacer 13 is disposed at the hole of the device insertion hole 2, the hexagon head 51 can be prevented from entering the device insertion hole 2.

  Since the inclination measuring device 10 can be installed at the same time as the primary support construction of the tunnel 1, it does not affect the excavation work.

  The embodiment according to the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and it is needless to say that the above-described components can be appropriately changed without departing from the spirit of the present invention.

  For example, in the above embodiment, the case where the inclination measuring device 10 is arranged in the device insertion hole 2 formed upward at the top end portion of the tunnel 1 has been described, but the inclination measuring device 10 is not necessarily installed at the top end of the tunnel 1. There is no need to do it, and there is no need to install it upwards.

In the embodiment, the case where a sheet-like member is used as the protection member 30 has been described, but the configuration of the protection member 30 is not limited.
For example, as shown in FIG. 4, the protection member 30 may be configured by a tubular member such as a vinyl chloride pipe, and the storage case 40 may be fixed to the protection member 30.

DESCRIPTION OF SYMBOLS 1 Tunnel 2 Apparatus insertion hole 10 Inclination measuring apparatus 11 Fixing part 12 Measuring part 20 Retaining member 21 Male thread part 30 Protection member 31 Cover sheet 40 Storage case 41 Female thread part 50 Inclinometer 51 Hex head 60 Spacer 70 Exhaust tube

Claims (8)

A fixing unit having a retaining member and a protective member fixed to the retaining member; a storage case detachably fixed to the fixing unit; and a measuring unit having an inclinometer stored in the storage case. A preparation step for preparing an inclination measuring device;
A drilling process for drilling a device insertion hole in the tunnel wall;
An insertion step of inserting the inclination measuring device into the device insertion hole and hooking the retaining member on a hole wall of the device insertion hole;
An inclinometer installation method comprising: an injection step of injecting a filler into a gap between a hole wall of the device insertion hole and the inclination measuring device. In the insertion step, an exhaust tube is piped from the hole of the device insertion hole to the tip of the fixing unit,
2. The inclinometer installation method according to claim 1, wherein air in the device insertion hole is exhausted through the exhaust tube in the injection step. An inclination measuring device disposed in a device insertion hole formed in a tunnel,
A fixing unit fixed in the device insertion hole;
A measuring unit detachably fixed to the fixing unit,
The fixing unit has a retaining member that is latched in the device insertion hole and a protective member fixed to the retaining member,
The measurement unit includes a storage case housed in the protective member and an inclinometer stored in the storage case. The storage case is detachably connected to the retaining member,
The inclination measuring apparatus according to claim 3, wherein the protection member covers the storage case and covers a connection portion between the storage case and the retaining member. The retaining member is formed with a male screw portion,
A female screw part is formed in the storage case,
The inclination measuring device according to claim 4, wherein the female screw portion is screwed to the male screw portion.   The inclination measuring device according to claim 5, wherein a hexagonal head is formed at a base end portion of the measuring unit.   The inclination measuring apparatus according to any one of claims 4 to 6, wherein the protective member has a cylindrical cover sheet.   The inclination according to any one of claims 3 to 7, further comprising a spacer that shields a gap between the device insertion hole and the storage case at the hole of the device insertion hole. Measuring device.

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