JP2004301642A - Tunnel survey target device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the attachment and detachment work of a survey target by facilitating the attachment and the detachment of the survey target to/from a timbering set in a tunnel. <P>SOLUTION: This survey target attached to the timbering S of the tunnel comprises a body part 3 provided with a plumb bob 8 and a prism 4, and a magnet part 2 integrated with the body part 3 and fixable to the timbering S. In the body part 3, the prism 4 is fixed to the inside. The body part 3 is formed by a frame member provided with a leveling string 9 of the plumb bob 8 and a leveling string 6 crossing the leveling string 9 and the prism 4 inside of the body part adjustable in position respectively. The magnet part 2 is provided with an operation member 2a for magnetization or demagnetization of magnetism. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a survey target device used to measure displacement of a shoring during tunnel construction.
[0002]
[Prior art]
At a tunnel construction site, a surveying target is installed on a support after the primary lining, a laser beam is irradiated, and the displacement in the air is measured by an optical measurement device (for example, see Patent Document 1).
Conventionally, an iron surveying target including a laser beam irradiation unit and a prism has been attached to a support by welding.
[0003]
[Patent Document 1]
JP 2000-88572 A
[Problems to be solved by the invention]
However, since the measurement of the inner space displacement is performed based on the laser beam irradiated to the upper half and the lower half of the tunnel, each survey target must be welded to the upper half and lower half of the support. I had to.
In particular, in the case of large diameter tunnels, the surveying target must be mounted on an aerial work vehicle and welded to the upper half of the support, and after the measurement, the surveying target must be removed by hitting the weld with a hammer. The installation and removal work involved a danger in the place.
[0005]
SUMMARY OF THE INVENTION It is an object of the present invention to improve the attachment / detachment work of a surveying target installed at a tunnel supporter by facilitating attachment / detachment to the supporter.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the invention according to claim 1 is, for example, a survey target attached to a tunnel support S as shown in FIGS. A tunnel surveying target device 1 comprising a portion 3 and a magnet portion 2 integrated with the main body portion 3 and fixable to the support S is characterized.
[0007]
According to the first aspect of the present invention, since the magnet portion is integrated with the main body portion including the plunger and the prism, the survey target can be attached and detached with one touch to the tunnel support by the magnet portion.
In addition, since the vertical direction is downward swing, it is possible to use the same laser beam in the upper half and the lower half to use the target in the lower half, and to simplify the laser management.
[0008]
The invention according to claim 2 is the tunnel surveying target device 1 according to claim 1, wherein, for example, as shown in FIG. 2, the main unit 3 is configured such that the prism 4 is fixed inward. The water thread 9 of the plunger 8 and the leveling thread 6 intersecting with the water thread 9 and the prism 4 are each formed by a frame member provided inside so as to be adjustable in position. .
[0009]
According to the second aspect of the present invention, the laser beam is adjusted by adjusting the position of the leveling thread and the lower swinging water thread that intersect near the optical axis of the prism inside the frame member forming the main body. The intersection of the leveling thread and the down swing water thread can be matched. As a result, the measurement of the air displacement in the tunnel is performed by the optical measuring device using the prism located at a predetermined distance laterally from the yarn intersection, which is the laser beam irradiation unit.
[0010]
According to a third aspect of the present invention, there is provided the tunnel surveying target device 1 according to the first or second aspect. For example, as shown in FIGS. -A demagnetizing operation member 2a is provided.
[0011]
According to the third aspect of the present invention, since the excitation and demagnetization can be operated by the operation member provided on the magnet portion, the operation load for attaching and detaching the tunnel support by the magnet is small.
[0012]
The invention according to claim 4 is the tunnel surveying target device 1 according to claim 2 or 3, wherein, for example, as shown in FIG. The frame member 13 is slidably mounted in a horizontal direction, and a support member 17 for integrally supporting the prism 4 and the leveling thread 6 is provided. It is characterized by being slidably mounted in the vertical direction.
[0013]
According to the invention as set forth in claim 4, by sliding the frame member in the lateral direction with respect to the magnet portion side, it is possible to adjust the down swing and the horizontal position of the prism and the leveling thread together, and furthermore, the support member The height position of the prism and the thread for leveling can be simultaneously adjusted by sliding in the vertical direction with respect to the frame member.
[0014]
The invention according to claim 5 is the tunnel surveying target device 1 according to any one of claims 2 to 4, wherein, for example, as shown in FIG. The frame member 13 is rotatably assembled to the part 2 side.
[0015]
According to the fifth aspect of the present invention, since the frame member can be rotated with respect to the magnet portion side, the frame member can be held in a horizontal position even if the mounting portion of the magnet portion with respect to the tunnel support is an inclined surface. .
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0017]
[First Embodiment]
1 and 2, L1 is an upper half laser beam, L2 is a lower half laser beam, S is a tunnel support, 1 is a tunnel surveying target device, 2 is a magnet unit, 2a is an operation handle (operation member), 3 is The main body (frame member), 4 is a prism, 5 is a prism holder, 6 is a leveling thread, 7 is a pipe, 8 is a swing, 9 is a water thread, and 10 is a pipe.
[0018]
After the primary lining, as shown in FIG. 1, the upper half laser light L1 and the lower half laser light L2 serving as reference light for surveying are always radiated in the tunnel at an interval of, for example, 2 m above and below. .
As shown in FIG. 2 in an enlarged manner, the tunnel surveying target device 1 has a main body 3 integrally fixed to a magnet 2. The magnet part 2 is a box-shaped one having a built-in magnet that can be attracted and fixed to the surface of the steel material of the support S, and has an operating member 2a for exciting and demagnetizing the magnetic force of the built-in magnet. More specifically, the magnet is excited and demagnetized by rotating the operation handle 2a.
[0019]
The main body portion 3 is formed of a horizontally long rectangular frame member, and the magnet portion 2 is fixed to a protruding portion 3a from one end, and a central vertical bar portion 3b is provided on the frame member. .
In the main body 3, a prism 4 is fixed via a prism holder 5 on a lower horizontal bar 3c opposite to the magnet 2 with the central vertical bar 3b interposed therebetween. The optical axis angle of the prism 4 can be adjusted by a prism holder 5.
[0020]
Further, a leveling thread 6 is stretched over the vertical bar portion 3d on the side where the prism 4 is located and the central vertical bar portion 3b. That is, both ends of the leveling thread 6 are fixed to the pipes 7 slidable along the tip vertical bar 3d and the central vertical bar 3b, respectively.
A swing 8 is suspended from the upper horizontal bar 3e above the prism 5. That is, in the down swing 8, the upper end of the water thread 9 is fixed to the pipe 10 which can slide along the upper horizontal bar 3e. The water thread 9 has a length sufficient to irradiate the upper half laser beam L1 and the lower half laser beam L2 (see FIG. 1).
[0021]
Next, how to use the tunnel survey target device 1 having the above configuration will be described.
As shown in FIG. 1, the tunnel surveying target device 1 is fixed to the upper half portion of the support S by the magnet 2 at an appropriate place in the tunnel. That is, the magnet part 2 is attracted and fixed to the steel surface of the support S by turning the operation handle 2a to excite the magnet.
Then, the pipe 7.7 is slid along the tip vertical bar 3d and the central vertical bar 3b of the main body 3 to adjust the position of the leveling thread 6, and the pipe 10 is moved along the upper horizontal bar 3e. Slide to adjust the position of the plunger 8 (water thread 9). That is, as shown in the drawing, the adjustment is made so that the intersection of the leveling thread 6 and the water thread 9 is irradiated with the upper half laser beam L1.
[0022]
After such adjustment, when the swing of the down swing 8 stops, as shown in FIG. 1, the lower half of the water thread 9 is irradiated with the lower half laser beam L2.
After that, after adjusting the optical axis of the prism 4 at a position distant from the upper half laser beam L1 by a predetermined dimension (for example, 5 cm), the displacement in the tunnel is measured using a known optical measuring device. Is
When the measurement is no longer necessary, the operation handle 2a is rotated to demagnetize the magnet, thereby removing the tunnel survey target device 1 together with the magnet unit 2 from the steel surface of the support S.
Thus, the tunnel surveying target device 1 can be easily attached to and detached from the support S with a small operation load by operating the operation handle 2a of the magnet unit 2.
[0023]
[Second embodiment]
In this embodiment, as shown in FIG. 3, the tunnel surveying target device 1 is configured such that the main body 3 is composed of a frame member 13 and a fork member 14 on the magnet unit 2 side.
That is, the frame member 13 has the left and right vertical bar portions 13a, 13a and the upper and lower horizontal bar portions 13b, 13b which are parallel to each other, and the hollow projecting portion 13c, which is located on the extension of the upper and lower horizontal bar portions 13b, 13b. 13c. As shown, the upper and lower horizontal bar portions 14b and 14b of the fork member 14 fixed to the magnet portion 2 slide in the upper and lower hollow protrusion portions 13c and 13c, respectively, as shown in the drawing. It can be inserted freely and can be fixed by screws 15.
[0024]
A support member 17 is provided to connect the lower portions of the pipes 7 slidable along the left and right vertical rod portions 13a of the frame member 13. The prism 4 is fixed on the support member 17 via the prism holder 5. Further, the pipes 7 can be fixed to the vertical rod portions 13a by screws 7a.
The pipe 10 to which the water thread 9 of the plumb bob 8 is fixed can be fixed to the horizontal bar 13b by a screw 10a.
[0025]
With such a configuration, the following operational effects can be obtained.
First, the frame member 13 is slid in the lateral direction with respect to the fork member 14 on the magnet part 2 side fixed to the support S because of the structure in which the horizontal bar parts 14b and 14b are inserted into the upper and lower hollow projecting parts 13c and 13c. Thereby, the horizontal position of the plunger 8, the prism 4, and the leveling thread 6 can be adjusted together.
Since the pipes 7.7 slide along the right and left vertical rod portions 13a, the supporting member 17 connecting the lower portions of the pipes 7.7 is slid vertically with respect to the frame member 17. , The height position of the prism 4 and the leveling thread 6 can be adjusted simultaneously.
[0026]
[Third Embodiment]
In this embodiment, the tunnel surveying target device 1 is, as shown in FIG.
The main body 3 including the frame member 13 and the fork member 14 of the second embodiment is configured to be rotatable with respect to the magnet unit 2 side.
That is, the protruding portion 14 a of the fork member 14 is rotatably connected to the arm member 12 protruding from the magnet portion 2 by the connecting shaft 16. The connecting shaft 16 has a bolt / nut tightening structure so that the protruding portion 14 a can be fixed at a predetermined angle with respect to the arm member 12.
[0027]
With this configuration, as shown in the figure, when the mounting portion of the magnet portion 2 with respect to the upper half portion of the support S is an inclined surface, the fork member 14 is connected to the arm member 12 of the magnet portion 2 by the connecting shaft 16. By rotating the frame member 13, the frame member 13 can be held at the horizontal position.
It is confirmed that the frame member 13 is in the horizontal position by the leveling device 18 installed on the upper horizontal bar portion 13b of the frame member 13.
[0028]
In addition to the above embodiments, specific detailed structures of the sliding portion and the rotating portion can be appropriately changed.
[0029]
【The invention's effect】
According to the first aspect of the present invention, the surveying target can be attached / detached to / from the tunnel support by one-touch by the magnet unit integrated with the main body unit including the bobbin and the prism. Can be greatly improved.
Further, since the vertical direction is lowered, the laser beams in the upper half and the lower half are made to be the same, so that the laser light can be used even in the target in the lower half and the laser management can be simplified.
[0030]
According to the third aspect of the present invention, in addition to the effect obtained by the first aspect of the present invention, the operation load for attaching and detaching the tunnel support by magnetic force can be reduced by the magnetizing and demagnetizing operations. Benefits are obtained.
[0031]
According to the fourth aspect of the present invention, in addition to the effects obtained by the first or third aspect of the present invention, the frame member is slid in the lateral direction with respect to the magnet portion side, and the frame swings, the prism and the leveling. This has the advantage that the left and right positions of the thread can be adjusted together and the height position of the prism and the leveling thread can be adjusted simultaneously by sliding the support member vertically with respect to the frame member.
[0032]
According to the invention described in claim 5, in addition to the effect obtained by the invention described in any one of claims 1, 3, and 4, the mounting portion of the magnet portion with respect to the tunnel supporter has an inclined surface. However, there is an advantage that the frame member can be held in a horizontal position by a rotating operation on the magnet portion side.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view showing a configuration of an embodiment to which the present invention is applied, showing a state of attachment to a shoring.
FIG. 2 is an enlarged view of a main part of FIG.
FIG. 3 is a schematic front view showing a second embodiment to which the present invention is applied.
FIG. 4 is a schematic front view showing a third embodiment to which the present invention is applied.
[Explanation of symbols]
L1 Upper half laser beam L2 Lower half laser beam S Tunnel support 1 Tunnel survey target device 2 Magnet unit 2a Operation handle (operation member)
3 Body (frame member)
4 Prism 5 Prism holder 6 Leveling thread 7 Pipe 8 Plumbing 9 Water thread 10 Pipe 12 Arm member 13 Frame member 14 Fork member 16 Connecting shaft 17 Support member 18 Leveler

Claims (5)

A survey target to be attached to a tunnel support,
A main body with a plumb bob and a prism,
A tunnel surveying target device comprising a magnet unit integrated with the main body unit and fixed to the support. A frame member provided with the main body portion, wherein the prism is fixed inwardly, and the downspring water thread and the leveling thread intersecting with the water thread and the prism are respectively provided in a position-adjustable inward direction; The tunnel surveying target device according to claim 1, wherein the target device is formed by: 3. The tunnel surveying target device according to claim 1, wherein the magnet unit is provided with an operation member for exciting and demagnetizing a magnetic force. 4. The main body is assembled such that the frame member is slidable in the lateral direction with respect to the magnet part side,
A support member for integrally supporting the prism and the leveling thread is provided,
The tunnel surveying target device according to claim 2 or 3, wherein the support member is assembled to the frame member so as to be slidable in a vertical direction. The tunnel surveying target device according to any one of claims 2 to 4, wherein the frame member is rotatably assembled to the magnet unit side.

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