Measuring jig

Abstract

This invention proposes a measuring jig for measuring the position and angle of the opening of buried pipes installed underground. [Solution] A measuring jig 1 is fixed to the opening of a buried pipe P, comprising an opening packer 2 fixed to the opening, a target installation pipe 3 fixed to the base end of the opening packer 2, and a length measuring device 4 fixed to the base end of the target installation pipe 3. Multiple targets can be fixed to the target installation pipe 3. The length measuring device 4 can measure the length of a wire cable 6 connected to an inclinometer 5 inserted into the buried pipe P.

Description

Technical Field

[0001] The present invention relates to a measuring jig.

Background Art

[0002] In ground improvement, freezing methods, geological surveys, etc., there are cases where holes are drilled in the ground and buried pipes such as steel pipes and casing pipes (hereinafter referred to as "buried pipes") are disposed underground. If the position and orientation of the buried pipes disposed underground can be appropriately grasped, the ground conditions (including the ground conditions after improvement and freezing) can be appropriately grasped.

[0003] Therefore, there are cases where an inclinometer is used to measure the inclination angle of a buried pipe. For example, Patent Document 1 discloses an insertion-type inclinometer that is inserted into a buried pipe and moves along the inner surface of the buried pipe to measure the inclination angle of the buried pipe with respect to the vertical. The insertion-type inclinometer of Patent Document 1 includes a pressure detector, and the depth position is detected by the water pressure detected by this pressure detector.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Since the insertion-type inclinometer of Patent Document 1 has an inclination angle detection unit provided at the center of a rod-shaped member of a predetermined length, it is impossible to measure the inclination angle of the end of the buried pipe (such as the orientation of the hole opening). On the other hand, a technique for measuring the inclination angle of the buried pipe at the base end (hole opening part) of the buried pipe has not been established. In addition, in order to manage the position (coordinates) of the buried pipe disposed underground, it is common to perform surveying separately.

[0006] From this perspective, the object of the present invention is to propose a measuring jig for measuring the position and angle of the opening of a buried pipe laid underground. [Means for solving the problem]

[0007] To solve the aforementioned problems, the present invention provides a measuring jig that is fixed to the opening of a buried pipe, and has a target mounting pipe to which a plurality of targets can be fixed. With this measuring jig, by measuring multiple targets fixed to the target installation pipe, the position (coordinates) of the hole opening of the buried pipe can be determined, and the angle of the hole opening can be calculated from the positional relationship (coordinates) of the targets.

[0008] Preferably, the measuring jig further comprises a packer section at the opening that is fixed to the target installation pipe. Preferably, such a packer section at the opening comprises an insertion section that is inserted into the hole of the buried pipe and a packer section that surrounds the insertion section. In this way, the packer section can be fixed to the hole of the buried pipe, thereby preventing the measuring jig from falling off.

[0009] Furthermore, it is desirable that the measuring jig further includes a length measuring device fixed to the base end of the target installation pipe. The length measuring device is capable of measuring the length of wire cable that is fed out and connected to an inclinometer inserted into the buried pipe. With this measuring jig, the position of the inclinometer can be measured using a length measuring instrument, making it possible to measure the angle of inclination relative to the length (depth) of the buried pipe. [Effects of the Invention]

[0010] According to the measuring jig of the present invention, the position and angle of the opening of a buried pipe laid underground can be appropriately determined. [Brief explanation of the drawing]

[0011] [Figure 1] This is a side view showing a tunnel with buried pipes laid around it. [Figure 2] This is a side view showing the setup of the measuring jig. [Figure 3] This is a side view showing the measuring jig. [Figure 4] This is a cross-sectional view showing the mouth opening. [Figure 5] This diagram shows the target installation pipe, where (a) is a plan view and (b) is a cross-sectional view. [Figure 6] This is a cross-sectional view showing a measuring instrument. [Modes for carrying out the invention]

[0012] This embodiment describes the method for measuring the position and orientation (angle of inclination) of buried pipes P laid in the ground from inside the tunnel during the construction of tunnel T. As shown in Figure 1, multiple buried pipes P are laid out from inside the tunnel outwards, spaced apart in the circumferential direction of tunnel T. In this embodiment, the angle of inclination of the buried pipes P, and the position and orientation of the base end of the buried pipes P are measured.

[0013] Figure 2 shows the measurement procedure for the buried pipe P. As shown in Figure 2, the inclinometer 5 is inserted into the buried pipe P to measure the inclinometer angle of the buried pipe P, and the position and orientation of the base end of the buried pipe P are measured via a measuring jig 1 fixed to the base end of the buried pipe P. In this way, the position of the buried pipe P whose inclinometer angle has been measured can be determined and used to manage the effects of the buried pipe P depending on its intended use (e.g., ground improvement or freezing).

[0014] Figure 3 shows the measuring jig 1. As shown in Figure 3, the measuring jig 1 comprises a mouth packer 2, a target installation pipe 3, and a length measuring device 4. Figure 4 shows the opening packer 2. As shown in Figure 4, the opening packer 2 comprises an insertion part 21 that is inserted into the opening of the buried pipe P, a packer part 22 that is arranged around the insertion part 21, and a connecting part 23 that is fixed to the base end of the insertion part 21.

[0015] The insertion part 21 is made of a cylindrical member, and a packing part 22 is arranged on the outer peripheral surface. The packing part 22 is a rubber cylindrical member that abuts against the inner surface of the embedded pipe P when the insertion part 21 is inserted into the embedded pipe P. The packing part 22 has an outer shape that is not less than the inner diameter of the embedded pipe. A part of the connecting part 23 is inserted into the insertion part 21, and the remaining part protrudes from the insertion part 21 and is fixed to the insertion part 21. A male screw is formed on the outer peripheral surface of the protruding part of the connecting part 23 from the insertion part 21. In addition, a gripping part 24 is provided on the connecting part 23. The mouthpiece packer 2 inserts and removes it from the embedded pipe P with the gripping part 24 (see Fig. 2).

[0016] As shown in Fig. 3, the target installation pipe 3 is fixed to the connecting part 23 of the mouthpiece packer 2. That is, the target installation pipe 3 is fixed to the hole opening part of the embedded pipe P via the mouthpiece packer 2.

[0017] The target installation pipe 3 is shown in Fig. 5. As shown in Figs. 5(a) and (b), the target installation pipe 3 is made of a cylindrical member. As shown in Fig. 5(b), screw threads are formed on the inner peripheral surfaces of the base end part and the tip end part of the target installation pipe 3, and female screw parts 31 are formed. As shown in Fig. 3, the target installation pipe 3 is fixed to the base end part of the mouthpiece packer 2 by screwing the female screw part 31 at the tip end part thereof to the connecting part 23 of the mouthpiece packer 2. As shown in Fig. 5(b), a pedestal 32 for fixing the target is fixed to the outer surface of the target installation pipe 3. In the present embodiment, three pedestals 32, 32, 32 are provided in a staggered manner at intervals. The straight line connecting the center of the pedestal 32 on the tip end side and the center of the pedestal 32 on the base end side is parallel to the central axis of the target installation pipe 3, and the center of the central pedestal 32 is offset from the straight line. In addition, the centroid of the triangle having the centers of the three pedestals 32, 32, 32 as vertices is located on the central axis of the target installation pipe 3. As shown in Fig. 5(a), a pair of handles 33, 33 are formed on the outer surface of the target installation pipe 3.

[0018] As shown in Figure 2, the length measuring device 4 is fixed to the base end of the target installation pipe 3. The length measuring device 4 measures the length of the wire cable 6 that is connected to the inclinometer 5 inserted into the buried pipe P. By measuring the length of the wire cable 6 with the length measuring device 4, the position (depth) at which the inclination angle of the buried pipe was measured can be determined.

[0019] Figure 6 shows the length measuring device 4. As shown in Figure 6, the length measuring device 4 comprises a roller 41, a main body 42, a connecting jig 43, and a support base 44. The roller 41 is rotatably supported by the main body 42. In this embodiment, a plurality of rollers 41, 41, ... are provided. The roller 41 rotates around an axis perpendicular to the wire cable 6. The plurality of rollers 41, 41, ... are provided so as to contact the wire cable 6 when the inclinometer 5 is inserted into the buried pipe P, and rotate as the wire cable 6 moves. In this embodiment, two types of rollers 41, one long and one short, are arranged at intervals along the longitudinal direction of the wire cable 6. The long roller 41 is arranged on both sides of the wire cable 6. The short roller 41 is arranged on both sides of the wire cable 6 between the long roller 41 and the connecting jig 43. The main body 42 is a so-called encoder, which measures the length of the wire cable 6 (depth of the inclinometer 5) that has passed between the rollers 41 based on the rotation speed of at least one roller 41. A support base 44 is fixed to the main body 42. A retaining tube 45 for holding the connecting jig 43 is fixed to the support base 44. The connecting jig 43 consists of a cylindrical member. The connecting jig 43 is fixed by a fixing bolt 46 while inserted into the retaining tube 45. The outer circumferential surface of the tip of the connecting jig 43 is threaded, forming a male threaded portion 47. As shown in Figure 3, the length measuring device 4 is connected to the target installation pipe 3 by screwing the male threaded portion 47 of the connecting jig 43 into the female threaded portion 31 at the base end of the target installation pipe 3.

[0020] When measuring the embedded pipe P using the measuring jig 1, as shown in Fig. 2, the inclinometer 5 is inserted into the embedded pipe P, and the mouthpiece packer 2 is inserted into the mouth of the embedded pipe P to fix the measuring jig 1. When the mouthpiece packer 2 is inserted into the embedded pipe P, the packer portion 22 is fixed in close contact with the inner surface of the embedded pipe P. The wire cable 6 connected to the inclinometer 5 is inserted through the measuring jig 1 (mouthpiece packer 2, target installation pipe 3 and connection jig 43). The wire cable 6 of the present embodiment is used which has a strength that allows the inclinometer 5 to be moved back and forth within the embedded pipe P. That is, even when the inclinometer 5 is pushed into the upwardly provided embedded pipe P using the wire cable 6, the wire cable 6 has a strength such that it does not bend.

[0021] After fixing the measuring jig 1 to the mouth of the embedded pipe P, the target fixed to the target installation pipe 3 is measured using a surveying instrument such as a total station (not shown). Thereby, the position (coordinates) and orientation (angle) of the mouth of the embedded pipe P are grasped.

[0022] Subsequently, the inclinometer 5 is pushed to the tip of the embedded pipe P. Then, while pulling back the inclinometer 5, the inclination angle is measured at a predetermined position. At this time, the depth gauge 4 measures the position (depth) at which the inclination angle is measured. The measurement results are managed using the measured values of the inclinometer 5 and the depth gauge 4, and the coordinates and orientation of the mouth of the embedded pipe P.

[0023] According to the measuring jig 1 of the present embodiment, by measuring a plurality of targets fixed to the target installation pipe 3, the position (3D coordinates) of the mouth of the embedded pipe P can be grasped, and the angle of the mouth can be calculated from the positional relationship (3D coordinates) between the targets. Therefore, by associating this 3D coordinate with the measurement result of the inclinometer 5, the angle corresponding to the depth position of the embedded pipe can be grasped, and data management becomes easy.

[0024] In addition, since the target installation pipe 3 is fixed to the embedded pipe P via the mouthpiece packer 2, it is difficult to fall off. Furthermore, by measuring the length of the wire cable 6 using the length measuring device 4, the position of the inclinometer 5 can be determined, and the angle of inclination for each position (depth) of the buried pipe P can be determined. In addition, by managing the length of the wire cable 6 and the three-dimensional coordinates of the hole opening of the buried pipe P, the measurement points for the angle of inclination can be managed using coordinates.

[0025] Although embodiments of the present invention have been described above, the invention is not limited to these embodiments, and each of the above-mentioned components can be modified as appropriate without departing from the spirit of the present invention. The use of measuring jig 1 is not limited to tunnel construction; for example, it may also be used for measurements from above ground, and the objects to be measured are not limited. The method of fixing the target installation pipe 3 is not limited; for example, it may be fixed directly to the buried pipe P.

[0026] The number of targets (number of bases 32) to be installed on the target installation pipe 3 is not limited and can be determined as appropriate. Furthermore, the configuration of the mouth packer 2 is not limited and can be determined as appropriate. The measuring instrument 4 may be installed as needed. Furthermore, the configuration of the measuring instrument 4 is not limited. [Explanation of symbols]

[0027] 1. Measuring jig 2. Mouth opening 21 Insertion part 22 Packer Club 23 Connecting part 24 Gripping part 3 Target installation pipe 31 Female thread section 32 bases 33 Handle 4 Measuring Instruments 41 Rollers 42 Main body 43. Connecting jig 44 Support stand 45 Holding tube 46 Fixing bolts 47 Male screw part 5 Inclinometer 6 Wire Cables P Buried pipe T Tunnel

Claims

1. A measuring jig that is fixed to the opening of a buried pipe, A measuring jig characterized by having a target mounting pipe capable of fixing multiple targets.

2. The system further includes a mouth packer that is fixed to the target installation pipe, The measuring jig according to claim 1, characterized in that the mouth packer comprises an insertion portion that is inserted into the opening of the buried pipe and a packer portion that is provided around the insertion portion.

3. The system further includes a length measuring device fixed to the base end of the target installation pipe, The measuring jig according to claim 1 or claim 2, characterized in that the measuring instrument is capable of measuring the length of wire cable being fed out, which is connected to an inclinometer inserted into the buried pipe.

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