JP2010150810A - Implement and method for measuring inclination - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an implement and a method for measuring inclination, which enable the suitable measurement of the inclination. <P>SOLUTION: The implement 1 for measuring the inclination includes a fixing portion 2 for being fixed to a guide pipe 20, a supporting portion 3 for rotatably supporting a tire roller 5 abutting on an inner peripheral surface of a boring rod 12, and the like. A guide pipe 20 fitted with the implement 1 for measuring the inclination is arranged in a boring rod 12, so that the axial center of the guide pipe 20 can agree with that of the boring rod 12. Thus, the guide pipe 20 fitted with the implement 1 for measuring the inclination is arranged in the boring rod 12 which is arranged in an excavated hole H under the attitude of the completion of the formation of the excavated hole H; and an inclinometer 30 is inserted into the guide pipe 20, so that the inclination of the excavated hole H can be suitably measured via the guide pipe 20 and the boring rod 12. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a tilt measuring jig and a tilt measuring method.

Conventionally, when measuring the inclination of a drilling hole, a method is known in which a guide pipe is disposed in the drilling hole, an inclinometer is moved up and down in the guide pipe, and the inclination is measured at each depth (for example, (See Patent Document 1).
Moreover, in the BH (Boring Hole) method using a boring machine, construction accuracy is managed by measuring the inclination of the ground portion of the core material built in the drilled hole.
Japanese Patent Publication No. 4-15402

  However, in the case of the conventional BH method, since the actual inclination of the excavation hole is not measured and the accuracy of the excavation hole is unknown, the actual situation is that the management of the construction accuracy is limited.

By the way, in the state where the drilling hole has been formed by the BH method, a hollow boring rod (drilling rod) is disposed in the drilling hole. It is also possible to measure the inclination of the borehole through the rod.
However, there is a difference between the inner diameter of the rod and the outer diameter of the guide tube, and there is a problem that accurate tilt measurement cannot be performed unless the posture is stabilized due to rattling of the guide tube in the rod. Also, it is a guide tube that is close in size to the rod. If the earth and sand get in between the rod and the guide tube, the rod and the guide tube are engaged by the earth and sand, so the guide tube is inserted into the rod. Further, there is a problem that it is difficult to pull out the guide tube from the rod, and the rod may be damaged at that time.

  An object of the present invention is to provide a tilt measuring jig and a tilt measuring method that enable a preferable tilt measurement.

In order to solve the above problems, the invention described in claim 1
An inclination measuring jig in which a guide tube into which an inclinometer is inserted is disposed in a hollow excavation shaft,
A fixing portion detachably attached to the outer peripheral surface of the guide tube;
At least three support portions provided at substantially equal intervals in the circumferential direction of the fixed portion and extending from the fixed portion toward the inner peripheral surface of the excavation shaft;
With
The support portion is in contact with the inner peripheral surface so that an axis of the excavation shaft and an axis of the guide tube are aligned with each other.

The invention described in claim 2 is the tilt measuring jig according to claim 1,
The support portion includes a rotating body support member provided in the fixed portion;
A rotating body that has an axis orthogonal to the axial direction of the excavation shaft and the radial direction of the excavation shaft, is rotatably supported on the distal end side of the rotating body support member, and contacts the inner peripheral surface;
It is characterized by providing.

The invention according to claim 3 is the tilt measuring jig according to claim 2,
At least one of the support parts includes a rotating body support member that can be elastically deformed in a direction in which the excavation shaft and the guide tube come into contact with and separate from each other.

The invention according to claim 4
An inclination measuring method using the inclination measuring jig according to claim 1,
A guide in which the inclination measuring jig is attached at a predetermined interval in the longitudinal direction inside the excavation shaft disposed in the excavation hole that is excavated by rotating a hollow excavation shaft provided at the tip with an excavation portion for excavating the ground A pipe is provided, and an inclinometer is inserted into the guide pipe to measure the inclination of the excavation hole.

According to the present invention, the inclination measuring jig is substantially fixed in the circumferential direction of the fixed portion so as to extend from the fixed portion to the inner peripheral surface of the excavation shaft. And at least three support portions provided at equal intervals, and when the guide tube to which the inclination measuring jig is attached is disposed in the hollow excavation shaft, the support portion is disposed on the inner peripheral surface of the excavation shaft. By abutting, the axis of the excavation shaft and the axis of the guide tube can be matched.
Then, the inclination of the excavating shaft can be measured through the guide tube by inserting an inclinometer into the guide tube and measuring the inclination.
In particular, with the posture in which the excavation hole has been formed, the guide tube equipped with the tilt measuring jig is disposed in the excavation shaft arranged in the excavation hole so that the guide tube and the excavation shaft are interposed. In addition, the inclination of the borehole can be measured suitably.
In addition, by attaching at least two inclination measuring jigs with a predetermined interval in the longitudinal direction of the guide tube, the posture of the guide tube in the excavation shaft becomes more stable. The axial centers can be matched more appropriately, and a more preferable tilt measurement can be performed.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

First, an outline of the boring machine 10 used for the BH method and the excavation of the ground G using the boring machine 10 will be described.
As shown in FIG. 1, a boring machine 10 is a device that forms a drilling hole H in the ground G by rotating and lowering a boring rod 12 that is a drilling shaft provided with a bit 11 that is a drilling part at the tip.
During the excavation, the stabilizing liquid supplied through the water swivel 13 is ejected from the bit 11 through the hollow boring rod 12. The mixed liquid of the earth and sand generated by excavation and the stabilizing liquid is pumped up by the sand pump 14. The pumped liquid mixture is separated into the stable liquid and the earth and sand by the cyclone screen 15, the stable liquid is stored in the stable liquid tank 16, and the earth and sand is collected in the remaining soil tank 17. The stabilizing liquid stored in the stabilizing tank 16 is fed to the water swivel 13 by the grout pump 18.
The excavation of the ground G by the boring machine 10 is the same as that of a conventionally known technique and will not be described in detail here.

  Next, the guide tube 20 and the inclinometer 30 used for tilt measurement will be described.

  As shown in FIGS. 2 and 3, the guide tube 20 is a tubular member installed at an inclination measurement location such as an excavation hole and has a substantially circular cross section in which guide guide grooves 21 are provided in four orthogonal directions. is doing. The diameter and length of the guide tube 20 are selected according to the measurement location to be used. The guide tube 20 is configured to be vertically connectable and can be extended to a desired length.

As shown in FIGS. 2 and 3, the inclinometer 30 includes an inclinometer body 31, an upper wheel 32 provided on the upper portion of the inclinometer body 31, and a lower wheel 33 provided on the lower portion of the inclinometer body 31. A communication cable 34 or the like extending above the inclinometer body 31 is provided. Further, the communication cable 34 is provided with an index 35 indicating the depth at predetermined intervals (for example, 50 cm).
In addition, when the space | interval of the parameter | index 35 which shows depth is 50 cm, for example, the measurement area length by this inclinometer 30 will be 50 cm.

Then, the inclinometer 30 is inserted into the guide tube 20 so as to guide the upper wheel 32 and the lower wheel 33 of the inclinometer 30 along the guide groove 21 in the guide tube 20 installed at an inclination measurement location such as a drilling hole. For example, the inclination of the excavation hole is measured through the guide tube 20.
Note that the tilt measurement with the inclinometer 30 inserted into the guide tube 20 is the same as a conventionally known method, and therefore will not be described in detail here.

  Next, the inclination measuring jig 1 according to the present invention will be described.

  As shown in FIGS. 4A and 4B, the inclination measuring jig 1 has a fixed portion 2 that is detachably attached to the outer peripheral surface of the guide tube 20 and a substantially equal interval in the circumferential direction of the fixed portion 2 (for example, And three support portions 3 provided at intervals of 120 °.

The fixing portion 2 includes a pair of fixing members 2 a and 2 b, and the first fixing member 2 a and the second fixing member 2 b are fastened with screws 8 and fixed to an arbitrary portion of the guide tube 20.
The inner diameter of the fixing portion 2 formed by fastening the first fixing member 2 a and the second fixing member 2 b with the screw 8 has substantially the same size as the outer diameter of the guide tube 20. That is, the outer surface of the guide tube 20 is sandwiched between the inner surface portion of the first fixing member 2a and the inner surface portion of the second fixing member 2b.
The first fixing member 2a is provided with two support portions 3, and the second fixing member 2b is provided with one support portion 3.

The support part 3 includes two support parts 3a provided on the first fixing member 2a and one support part 3b provided on the second fixing member 2b.
The first support portion 3a includes a plate member 4a that is a rotating body support member provided in the fixed portion 2 (first fixed member 2a), and a shaft 6 that is orthogonal to the axial direction and the radial direction of the excavation shaft 12 on the tip side of the plate member 4a. And a tire roller 5 that is a rotating body that is rotatably supported by the motor.
The second support portion 3b is orthogonal to the axial direction and the radial direction of the excavation shaft 12 on the distal end side of the spring material 4b, which is a rotating body support member provided on the fixing portion 2 (second fixing member 2b). A tire roller 5 that is a rotating body that is rotatably supported by a shaft 6 is provided.
The shaft 6 of the tire roller 5 in each support portion 3 (first support portion 3a, second support portion 3b) is orthogonal to the axial direction and the radial direction of the guide shaft 20.

Then, with the inclination measuring jig 1 attached to the guide tube 20, the first support portion 3 a and the second support portion 3 b extend radially outward from the fixed portion 2, respectively.
The lengths from the fixed portion 2 to the outer end of the tire roller 5 in the first support portion 3a and the second support portion 3b are designed to be the same.
However, since the spring material 4b of the second support portion 3b is made of elastically deformable spring steel (for example, SUS material 2t (thickness 2 mm)), the second support portion 3b is elastically deformed by the spring material 4b. The tire roller 5 is finely moved in a direction in which the tire roller 5 is in contact with and away from the fixed portion 2.

When the guide tube 20 to which the inclination measuring jig 1 is attached is disposed in the excavation shaft 12, the first support portion 3 a and the second support portion 3 b are connected from the fixed portion 2 to the inner peripheral surface of the excavation shaft 12. The tire rollers 5 in the three support portions 3 (3a, 3b) are in contact with the inner peripheral surface of the excavation shaft 12, so that the axis of the excavation shaft 12 and the axis of the guide tube 20 are extended. To match.
In particular, since the shaft 6 in the support portion 3 is arranged in a direction orthogonal to the axial direction and the radial direction of the excavation shaft 12 and the guide shaft 20, the tire roller 5 in contact with the inner peripheral surface of the excavation shaft 12 is Rotation can be suitably performed along the axial direction of the excavation shaft 12, and when the guide tube 20 to which the inclination measuring jig 1 is attached is disposed in the excavation shaft 12, it can be smoothly fed.
At this time, even if the inner peripheral surface of the excavation shaft 12 has some unevenness, the spring material 4b of the second support portion 3b can be elastically deformed in the direction in which the excavation shaft 12 and the guide tube 20 come into contact with and separate from each other. The guide tube 20 can be fed into the excavation shaft 20 and suitably disposed.

In order to more suitably arrange the guide tube 20 in the excavation shaft 12 when measuring the inclination, two or more intervals are provided in the longitudinal direction of the guide tube 20 (for example, 50 cm, 100 cm, etc.). It is preferable to attach the tilt measuring jig 1 to the guide tube 20.
For example, as shown in FIG. 4B, by attaching two tilt measuring jigs 1 at a predetermined interval in the vertical direction of the guide tube 20, the posture of the guide tube 20 in the excavation shaft 12 is stabilized. The shaft center of the excavation shaft 12 and the shaft center of the guide tube 20 are difficult to shift.

  Next, a tilt measuring method using the tilt measuring jig 1 according to the present invention and using the guide tube 20 and the inclinometer 30 will be described in accordance with the construction procedure of the BH method shown in FIG.

First, the mouth pipe P ₀ is built in the ground surface portion of the ground G, which is a point where the excavation hole H is formed (step (a) in FIG. 5). However, the mouth pipe P ₀ determines whether or not it is required to be built depending on the soil quality and strength of the ground G, and the mouth pipe P ₀ is not always necessary. For example, when the ground G is soft soil that does not stand on its own, the mouth pipe P ₀ is necessary.

Then, place the boring machine 10 to the vicinity of the mouth pipe P _0, from the mouth pipe P ₀ portion, is lowered while rotating the boring rod 12 having a bit 11 at the distal end, the borehole drilled to ground G H is formed (step (b) in FIG. 5).
During this excavation, the stabilizing liquid fed through the hollow boring rod 12 is ejected from the bit 11. In addition, if it is immediately after forming the excavation hole H, it is thought that the slime has not accumulated remarkably in the hole bottom of the excavation hole H, However, as the excavation depth of the excavation hole H is larger, the slime is likely to accumulate in a shorter time. . Since it has not been clarified what effect the deposited slime has on the tilt measurement, the slime treatment may be performed prior to the tilt measurement. For example, there is a method called a normal circulation method, in which a slime treatment is performed by ejecting a large volume of a stable liquid from a bit 11 using a boring rod 12. For this reason, it is possible to perform the slime process in the state without removing the boring rod 12. Thereafter, the inclination measurement described later may be performed.

After the predetermined excavation hole H is formed, at least two inclination measuring jigs 1 are elongated inside the hollow boring rod 12 disposed in the excavation hole H in the posture in which the excavation hole H has been formed. The guide tube 20 attached with a predetermined interval in the direction (vertical direction) is inserted and disposed (pre-process in the process (c) of FIG. 5). In order to prevent the inserted guide tube 20 from floating in the boring rod 12 filled with the stabilizing liquid, the fresh water is appropriately injected to prevent the guide pipe 20 from being lifted in advance. desirable.
At this time, the tire roller 5 of the support portion 3 of the inclination measuring jig 1 rotates while contacting the inner peripheral surface of the boring rod 12, so that the guide tube 20 is smoothly inserted into the boring rod 12. If several guide pipes 20 are connected and extended in advance, the guide pipe 20 can be quickly installed over the entire length of the boring rod 12 (excavation hole H).
The axis of the guide tube 20 disposed in the boring rod 12 coincides with the axis of the boring rod 12 by the inclination measuring jig 1 attached to the guide tube 20. Note that it is preferable to fix the mouths of the guide tube 20 and the boring rod 12 so that the guide tube 20 does not rotate in the boring rod 12.

Next, the inclinometer 30 is inserted into the guide tube 20 disposed in the boring rod 12, and the boring rod 12 is arranged so as to measure the inclination of the boring rod 12 through the guide tube 20. The inclination of the excavation hole H is measured (the subsequent step in step (c) in FIG. 5).
Here, since the boring rod 12 is arranged in the excavation hole H with the posture in which the excavation hole H has been formed, the inclination direction of the boring rod 12 and the inclination direction of the excavation hole H are the same. It can be said. Since the axis of the boring rod 12 and the axis of the guide tube 20 coincide with each other, the inclination of the borehole H is measured through the guide tube 20 and the boring rod 12 by measuring the inclination of the guide tube 20. It can be done.
After the inclination measurement, the inclinometer 30 is extracted from the guide tube 20, and the guide tube 20 is pulled up by a crane or the like. The pulled up guide tube 20 and the inclination measuring jig 1 are repeatedly used for the inclination measurement of the other excavation holes H.

After the measurement of the inclination of the excavation hole H is completed, the air lift pipe P ₁ is disposed in the excavation hole H instead of the boring rod 12.
Then, drilling holes mixture of slime and a stabilizing solution to be inserted into the H, while feeding air to the air lift pipe P ₁ by an air pipe EP, it performs slime processing to suck by the air lift pipe P ₁ (in FIG. 5 ( d) Step). This method is generally called a reverse circulation method. As described above, there are slime processing methods based on the above-described normal circulation method and reverse circulation method.
As described above, when slime treatment is performed before tilt measurement, for example, it takes approximately one hour of tilt measurement time per 20 m depth, so that slime is deposited on the bottom of the hole after the tilt measurement. It is highly possible that Therefore, it is desirable to perform the slime treatment again in order to maintain the quality of the concrete poured in the subsequent steps.

Next, H steel or a reinforcing bar R as a core material is built in the excavation hole H (step (e) in FIG. 5).
Furthermore, to set hitting pouring fresh concrete into the excavation hole H through tremie pipe P ₂ (in FIG. 5 (f) step).
Thus, a concrete pile can be constructed at a predetermined position.
The concrete pile constructed in this way is provided in the excavation hole H whose inclination is controlled, and the construction accuracy is good.

As described above, the inclination measuring jig 1 includes the fixing part 2 fixed to the guide tube 20 and the support part 3 that comes into contact with the inner peripheral surface of the boring rod 12, and the inclination measuring jig 1 is attached. By arranging the guide tube 20 in the boring rod 12, the axis of the guide tube 20 and the axis of the boring rod 12 can be matched.
The tilt of the boring rod 12 can be measured via the guide tube 20 by inserting the inclinometer 30 into the guide tube 20 and measuring the tilt.
In particular, the guide tube 20 and the boring are provided by disposing the guide tube 20 equipped with the inclination measuring jig 1 in the boring rod 12 disposed in the excavation hole H in the posture in which the excavation hole H has been formed. The inclination of the excavation hole H can be suitably measured through the rod 12.
Thus, if it is a construction method using the boring rod 12, it can apply to an inclination measurement by arrange | positioning the guide tube 20 equipped with the jig | tool 1 for an inclination measurement suitably. Therefore, the present invention is not limited to the BH (Boring Hole) method.

Then, after the inclination measurement is finished, the inclination measuring jig 1 removed from the guide tube 20 can be attached to another guide tube 20 and used for the inclination measurement of the excavation hole H at different construction sites. By using the tilt measuring jig 1, versatile excavation measurement becomes possible.
It should be noted that an inclination measuring jig having a fixed portion 2 having an inner diameter size corresponding to the outer diameter of the guide tube 20 and an inclination measurement having a support portion 3 having a length corresponding to the inner diameter size of the excavation shaft 12 and the size of the fixed portion 2. If various types of inclination measuring jigs such as a jig for use are equipped, it is possible to cope with various inclination measurements (for example, inclination measurement in the case where the guide tube 20 and the boring rod 12 have different thicknesses).

In the above embodiment, the guide tube 20 is disposed in the boring rod 12 disposed in the excavation hole H and the inclination of the excavation hole H is measured. However, the present invention is not limited to this. rather than shall, for example, so as to dispose the guide tube 20 inside the hollow shaft, such as air lift pipe P ₁ which in the same position as the boring rod 12 arranged in the drilled hole H (pipes), borehole The slope of H may be measured.

In the above embodiment, the inclination measuring jig 1 includes the three support portions 3. However, the present invention is not limited to this, and includes, for example, four or more support portions 3. It may be a thing.
In addition, the support portions 3 are not limited to be provided at equal intervals along the circumferential direction of the fixed portion 2. For example, the guide tube 20 and the boring rod 12 are concentrically arranged in cross section, and the guide tube 20 As long as the axis can be aligned with the axis of the boring rod 12, the interval between the support portions 3 may be arbitrary.

Further, in the above embodiment, the spring material 4b made of spring steel is used only for the second support portion 3b among the three support portions 3 in the inclination measuring jig 1, but two or more support portions 3 are used. You may use the spring material 4b.
Further, if the inner peripheral surface of the boring rod 12 has a sufficiently smooth surface, all the tire rollers 5 of the support portion 3 may be supported by the plate material 4a.

  In addition, it is needless to say that other specific detailed structures can be appropriately changed.

It is explanatory drawing which shows the outline | summary of the excavation of the ground by a boring machine. It is a side view which shows a guide tube and an inclinometer. It is a bottom view which shows the inclinometer inserted in the guide tube. It is a figure which shows the jig for inclination measurement which concerns on this invention, and is a bottom view (a) and a side view (b). It is explanatory drawing which shows the inclination measuring method using the jig for inclination measurement which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Jig for tilt measurement 2 Fixing part 2a 1st fixing member 2b 2nd fixing member 3 Support part 3a 1st support part 3b 2nd support part 4a Plate material (rotary body support member)
4b Spring material (rotary support member)
5 Tire roller (rotating body)
6 axis 8 screw 10 boring machine 11 bit (excavation part)
12 Boring rod (drilling shaft)
20 Guide pipe 30 Inclinometer 31 Inclinometer body 32 Upper wheel 33 Lower wheel 34 Communication cable 35 Index G Ground H Drilling hole

Claims (4)

An inclination measuring jig in which a guide tube into which an inclinometer is inserted is disposed in a hollow excavation shaft,
A fixing portion detachably attached to the outer peripheral surface of the guide tube;
At least three support portions provided at substantially equal intervals in the circumferential direction of the fixed portion and extending from the fixed portion toward the inner peripheral surface of the excavation shaft;
With
The tilt measuring jig, wherein the support portion is in contact with the inner peripheral surface so that an axis of the excavation shaft and an axis of the guide tube are aligned. The support portion includes a rotating body support member provided in the fixed portion;
A rotating body that has an axis orthogonal to the axial direction of the excavation shaft and the radial direction of the excavation shaft, is rotatably supported on the distal end side of the rotating body support member, and contacts the inner peripheral surface;
The inclination measuring jig according to claim 1, comprising:   The tilt measuring jig according to claim 2, wherein at least one of the support portions includes a rotating body support member that is elastically deformable in a direction in which the excavation shaft and the guide tube come into contact with and away from each other. . An inclination measuring method using the inclination measuring jig according to claim 1,
A guide in which the inclination measuring jig is attached at a predetermined interval in the longitudinal direction inside the excavation shaft disposed in the excavation hole that is excavated by rotating a hollow excavation shaft provided at the tip with an excavation portion for excavating the ground An inclination measuring method, comprising: arranging a pipe and inserting an inclinometer into the guide pipe to measure the inclination of the excavation hole.

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