JP2003014454A - Slope gauge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact slope gauge capable of being easily and surely installed on a circular pipe in a piping work and surely matching the axial direction of the slope gauge to the axial direction of the circular pipe in the installation to perform a precise pipe slope measurement. SOLUTION: This slope gauge is installed on the outer surface of the circular pipe in the piping work of the circular pipe in order to measure the slope or degree of horizontal or vertical of the circular pipe. This slope gauge comprises a fixed part formed of a sheet-like member substantially circularly curved to follow the circumferential direction of the circular pipe, which can match the axial direction of the circular pipe to its own axial direction by pressing the inner diameter-side surface to the surface of the circular pipe; and a bubble pipe provided on the outer diameter side of the fixed part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gradient meter, and more particularly, it can be easily and surely mounted on a circular pipe during plumbing work, and at the time of mounting, it can be used in the axial direction of the gradient meter and circular The present invention relates to a compact gradiometer capable of accurately measuring the pipe gradient by surely matching the axial directions of the pipes.

[0002]

2. Description of the Related Art Conventionally, a gradient meter has been used to measure the gradient of a circular pipe during the piping work of the circular pipe.
This gradiometer is conventionally composed of a quadrangular prism-shaped main body and a bubble tube provided on the side surface of the main body. It was placed on and used. Further, this conventional gradiometer is also used when measuring the verticality of a circular standpipe. At the time of measurement, the main body is placed along the circular standpipe and the main body is pressed against the circular standpipe. Met.

However, this conventional gradiometer is not fixed to a circular tube but is placed on the tube when measuring the gradient, and is pressed against the circular vertical tube when measuring the verticality. Was what was used. For this reason, it is necessary to carry a gradiometer when checking the gradient of the pipe,
It was necessary to place or press on the pipe one by one at each measurement point. Further, in this gradiometer, it is difficult to match the axial length direction with the axial length direction of the circular tube, and it takes time and labor for the measurement work, and it is difficult to measure an accurate gradient, horizontality, or verticality. there were.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and can be easily and surely mounted on a circular pipe during plumbing work, and can be mounted on a gradient pipe at the time of mounting. An object of the present invention is to provide a compact gradiometer capable of accurately measuring the pipe gradient by surely matching the axial length direction of the meter and the axial length direction of the pipe.

[0005]

The invention according to claim 1 is
A gradiometer attached to the outer surface of a circular pipe to measure the inclination, levelness, or verticality of the circular pipe during plumbing work. A fixed part that is a plate-shaped member that is curved in a substantially arcuate shape, and that presses the inner diameter side surface against the surface of the circular tube so that the axial length direction of the circular tube can match the axial length direction of the circular tube itself, and the fixed portion A gradient meter comprising a bubble tube provided on the radial side.

The invention according to claim 2 is a gradiometer which is mounted on the outer surface of a circular pipe in order to measure the inclination, horizontality or verticality of the circular pipe during the piping work of the circular pipe. , A long plate-like member that is curved in a substantially arc shape so as to extend substantially along the circumferential direction of the circular tube and extends in the direction along the axial direction of the circular tube, by pressing the inner diameter side surface against the surface of the circular tube. A fixing part that can match the axial length direction of the circular tube with its own axial length direction, and a plurality of bubble tubes provided on the outer diameter side of this fixing part at a predetermined interval in the axial length direction of the fixing part. And an adhesive provided on the inner diameter side of the fixing portion or an adhesive tape extending from both arc ends of the fixing portion, the fixing portion being separable at a portion between adjacent bubble tubes. It is a gradiometer characterized by being configured.

A third aspect of the present invention is a gradiometer mounted on the outer surface of a circular pipe for measuring the inclination, horizontality, or verticality of the circular pipe during piping work of the circular pipe. , A plate-like member that is curved in a substantially arc shape so as to extend substantially along the circumferential direction of the circular pipe, and presses the inner diameter side surface against the surface of the circular pipe so that the axial length direction of the circular pipe matches the axial length direction of itself. A fixing part that can be made, a bubble tube provided on the outer diameter side of the fixing part, an adhesive provided on the inner diameter side of the fixing part, or an adhesive tape extending from both arc ends of the fixing part, respectively. It is a gradiometer characterized by consisting of.

According to a fourth aspect of the present invention, there is provided a gradiometer mounted on the outer surface of a circular pipe for measuring the inclination, horizontality or verticality of the circular pipe during piping work. , A plate-like member that is curved in a substantially arc shape so as to substantially follow the circumferential direction of the circular tube, and presses the inner diameter side surface against the surface of the circular tube to match the axial length direction of the circular tube with its own axial length direction. The fixed portion to be obtained and a bubble tube provided on the outer diameter side of the fixed portion, wherein the fixed portion is composed of elastic members at least in the vicinity of both ends of the arc, and the length of the arc is the circular tube. It is a gradiometer characterized in that it has a length that allows it to be held and that it can be attached to a circular tube through a step of expanding the diameter of the elastic member.

According to a fifth aspect of the present invention, there is provided a gradiometer mounted on an outer surface of a circular pipe in order to measure a slope, a horizontal degree or a vertical degree of the circular pipe during the piping work of the circular pipe. , A plate-like member that is curved in a substantially arc shape so as to extend substantially along the circumferential direction of the circular pipe, and presses the inner diameter side surface against the surface of the circular pipe so that the axial length direction of the circular pipe matches the axial length direction of itself. And a bubble tube provided on the outer diameter side of the fixed section, and a hugging extending from both ends of the arc of the fixed section and biased by elastic members in a direction to tighten the circular tube. It is a gradiometer characterized by comprising a member.

According to a sixth aspect of the present invention, a shape memory alloy member is provided in place of the elastic member, and the shape memory alloy member has a temperature substantially equal to that of the surface of the circular tube, so that the embrace is held. The gradiometer according to claim 5, wherein the insert member is deformed into a shape that urges it toward the circular tube.

The invention according to claim 7 is the inclinometer according to any one of claims 1 to 5, characterized in that a knob is provided on the fixed portion.

The invention according to claim 8 is the gradiometer according to any one of claims 1 to 5, characterized in that the bubble tube is mounted on the fixed portion so as to be capable of changing direction. The above problems are solved by providing these inventions.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a first embodiment of a gradient meter according to the present invention. FIG. 2 is a diagram showing a state where the gradient measuring device of the gradient meter shown in FIG. 1 is mounted on a circular tube.

The gradiometer (1) according to the first embodiment has a circular pipe (6) for measuring the slope or the horizontality or verticality of the circular pipe (6) during the piping work of the circular pipe (6). 6)
Fixed to the outer surface of the fixed part (2)
And a bubble tube (3). In the fixing part (2) of the present invention, the fixing part (2) is provided with a circular pipe (6).
There is provided a mounting means for mounting on. Although the specific form of this mounting means is not particularly limited, the mounting means in the first embodiment is an adhesive (4) or an adhesive tape (14). The gradient meter (1) according to the first embodiment has a plurality of gradient measuring instruments (5) that are separable from each other and are connected to each other.

The fixed portion (2) is a long plate-shaped member which is curved in a substantially arc shape so as to extend substantially along the circumferential direction of the circular tube (6) and extends in the direction along the axial direction of the circular tube (6). Is. The fixing portion (2) can press the inner diameter side surface against the surface of the circular tube (6) to make the axial direction of the circular tube (6) coincide with the axial direction of itself. The material of the fixing portion (2) is not particularly limited, and for example, metal or synthetic resin can be adopted. When it is made of synthetic resin, for example, various synthetic resins such as hard vinyl chloride can be adopted. The material of the fixing portion (2) is preferably composed of elastic synthetic resin if possible. In the case of having elasticity, the fixing part (2) can be elastically deformed and can be mounted in close contact with the surface of various circular tubes (6) having different diameters.

In this fixed portion (2), a separable portion (12) is formed between adjacent bubble tubes (3), (3), and the gradient measuring device (5) is formed by separating this portion. ) Can be obtained. As a specific means for enabling separation, for example, a method of forming a fragile portion such as a perforation or a thin portion can be adopted. By forming a detachable part (12) on the fixed part (2), if you carry one inclinometer (1) with you at the pipe construction site, you can detach the inclinometers (5) one by one at each inclination measurement point. The separated gradient measuring device (5) can be attached to each measurement location. In addition, it is preferable that the outer diameter side surface of the fixed portion (2) is provided with a blank space in which a builder, a mounting date, and the like can be entered.

A plurality of bubble tubes (3) are provided on the outer diameter side of the fixed portion (2) at predetermined intervals in the axial direction of the fixed portion (2). The bubble tube (3) corresponds to a display section of the tube gradient or the verticality or horizontality of the tube, and is formed by enclosing bubbles and liquid in a transparent closed tube. As the material of the transparent closed tube, for example, glass or acrylic resin can be adopted. In the example shown in FIG. 1, each bubble tube (3) is arranged with its axial direction oriented toward the axial direction of the fixed portion (2), but in the present invention, each bubble tube (3) is arranged. May be arranged with the axial direction thereof oriented in a direction orthogonal to the axial direction of the fixed portion (2). In this case, the verticality of the circular standpipe (not shown) can be measured easily and accurately.

The bubble tube (3) is provided with a scale capable of measuring the gradient of a circular tube. By providing such a scale, for example, the gradient degree is zero, 1/50, 1/1
The gradient degree such as 00 can be read more accurately. Further, it is preferable that the liquid enclosed in the transparent closed tube contains a fluorescent paint. The color of the fluorescent paint is not particularly limited, but, for example, yellow, yellow-green or the like can be adopted. By including the fluorescent paint, the position of the bubble can be easily and accurately read even in a dark place.

The adhesive (4) is provided on the inner diameter side of the fixed portion (2). A release sheet (not shown) is provided on the surface of the adhesive (4). By peeling off the release sheet, the pressure-sensitive adhesive (4) can be exposed, and the fixing portion (2) can be adhesively fixed to the tube surface by the pressure-sensitive adhesive (4). Both the pressure-sensitive adhesive (4) and the release sheet are configured so that they can be separated at the separation location of the fixing portion (2).
It is also possible to provide an adhesive tape (14) instead of the adhesive (4) (see FIG. 3). This adhesive tape (1
4) is extended from the arcuate end portions (7) and (7) of the fixed portion (2), respectively. This adhesive tape (1
A release sheet (not shown) is provided on the pressure-sensitive adhesive surface of 4). By peeling off the release sheet, the adhesive can be exposed, and the fixing portion (2) can be adhesively fixed to the tube surface with the adhesive (see FIG. 4).

In the first embodiment, the fixing part (2) may be entirely in the shape of an arc, but as shown in FIG. 5, the axial length of the fixing part (2) is closer to the inner diameter side. Along the direction, a rib (15) is formed as a plurality of (two in the illustrated example) ridge-like projections (15), or, as illustrated in FIG. 6, the fixing part (2) has an axial length. Bend toward the inner diameter side along the direction and two ridge-shaped protrusions (1
5) may be formed. In either case, the ridges (15) are pressed against the surface of the circular tube (6).
By pressing the ridge-shaped projections (15) against the surface of the circular tube (6), the axial direction of the fixed portion (2) can be aligned with the axial direction of the circular tube (6). The ridge-like protrusion (15) is a part of the inner diameter side portion of the fixing portion (2).

According to the gradient meter (1) of the first embodiment, it can be easily and surely mounted on the outer surface of the circular pipe (6) during the plumbing work. In addition, when mounted, the axial length direction of the gradiometer (1) and the axial length direction of the circular pipe (6) can be surely matched to measure an accurate pipe slope, and the structure can be made compact. . Once the gradient meter (1) is attached, the gradient can be measured without carrying the gradient meter during the inspection, and the labor of the inspection can be greatly reduced.

Next, the gradient meter according to the second embodiment will be described. FIG. 7 is a perspective view showing a gradient meter according to the second embodiment. The gradiometer (1) according to the second embodiment comprises a fixing part (2), a bubble tube (3), and an adhesive (4) or an adhesive tape (not shown) as a mounting means. .

The gradient meter (1) according to the second embodiment differs from that of the first embodiment in that the fixing portion (2) is not a long member but a short member and is not detachable. is there. The gradient meter (1) according to the second embodiment corresponds to one gradient measuring device (5) according to the first embodiment.

In the second embodiment, the fixing portion (2) may have a complete arc shape as a whole, but as in the first embodiment, the fixing portion (2) has an axial direction in the inner diameter side. A plurality of ridge-shaped projections (15) along the line (two in the illustrated example)
(See FIGS. 5 and 6).

Next, the gradient meter according to the third embodiment will be described. FIG. 8 is a perspective view showing a gradient meter according to the third embodiment. FIG. 9 is a perspective view showing the gradient meter shown in FIG. 8 mounted on a circular tube. The gradiometer (1) according to the third embodiment comprises a fixed part (2) and a bubble tube (3). In the third embodiment, the fixing part (2) itself is provided with the mounting means.

The fixing portion (2) is a plate-like member which is curved in a substantially arc shape so as to extend substantially along the circumferential direction of the circular tube (6), and the inner diameter side surface is pressed against the surface of the circular tube (6). Is a member that can match the axial length direction of the circular tube (6) with its own axial length direction.

The fixed portion (2) is composed of elastic members at least near both ends (7) and (7) of the arc, and the length of the arc is such that the circular tube (6) can be held. It can be attached to the circular tube (6) through a diameter expansion step by elastic deformation of the elastic member. The type of the elastic member is not particularly limited, and can be made of, for example, an elastic metal or a synthetic resin, and examples of the elastic synthetic resin include, for example, hard vinyl chloride, polyethylene terephthalate, polypropylene and the like. Can be mentioned. By expanding the diameter of the elastic member by its elastic deformation, the fixed portion (2) can be fitted onto the circular pipe (6), and the fixed portion (2) can be made into various circular pipes (6) having different diameters. ) Can also be fitted on.

Although the fixing portion (2) may have a complete arc shape as a whole, as shown in FIG. 10, a plurality of fixing portions (2) are provided on the inner diameter side of the fixing portion (2) along the axial direction thereof. Ribs (15) as the ridge-shaped protrusions (15) of the book (two in the illustrated example)
Alternatively, as shown in FIG. 11, the fixing portion (2) is bent along the axial direction toward the inner diameter side to form two ridge-shaped protrusions (15) on the inner diameter side. May be In either case, the ridges (15) are pressed against the surface of the circular tube (6). Further, the fixed portion (2) may have a structure in which an outwardly extending extension piece (16) (see FIGS. 10 and 11) is formed at the tip of the arcuate portion. By providing the extending piece (16), the fixing portion (2) can be easily attached to the circular tube (6).

An adhesive (not shown) may be provided on the inner diameter side of the fixed portion (2). By providing the adhesive, the fixing portion (2) can be reliably fixed by the circular tube (6). A release sheet is usually provided on the surface of the pressure-sensitive adhesive.

The bubble tube (3) is provided on the outer diameter side of the fixed portion (2). The bubble tube (3) corresponds to a display portion of the tube gradient or the horizontal or vertical degree of the tube, and is formed by enclosing bubbles and liquid in a transparent closed tube. The bubble tube (3) may be fixed to the fixing portion (2) as shown in FIGS. 8 and 9, but may be attached to the fixing portion (2) so as to be capable of changing its direction as shown in FIGS. 12 and 13. The specific means for enabling the direction change is not particularly limited, but for example, the bubble tube (3) is rotatably mounted on the fixed portion (2), or the fixed portion (2) or the bubble tube (3) is attached. A plate-like or columnar magnet (17) is provided on either one (Fig.
4 and 15) and the other iron member (18)
Are provided so that they can be attracted to each other, a radial groove or ridge (19) is formed on the surface of the magnet (17), and the iron member (18) is fitted with this groove or ridge (19). Radial grooves or ridges (20) are formed, and the direction of the bubble tube (3) is changed depending on which groove or ridge (20) is fitted with which groove or ridge (20). Good.

By making the direction of the bubble tube (3) changeable, the verticality and horizontality of the tube can be accurately measured with one bubble tube (3).

The fixing portion (2) is preferably provided with knob pieces (9) and (9) (see FIGS. 8 and 9), respectively. By providing the knob pieces (9) and (9), the bubble tube (3) may be pinched and the bubble tube (3) may be damaged when the gradient meter (1) is attached to or detached from the circular tube (6). Moreover, the gradiometer (1) can be easily attached to and detached from the circular tube (6).

The gradient meter (1) according to the third embodiment is
It can be easily and surely attached to the circular pipe (6) during plumbing work. In addition, when mounted, the axial length direction of the gradiometer (1) and the axial length direction of the circular pipe (6) can be surely matched to accurately measure the pipe gradient or the verticality or horizontalness of the pipe, Moreover, it can be made compact.

Next, a gradient meter according to the fourth embodiment will be described. FIG. 16 is a perspective view showing a gradient meter according to the fourth embodiment. FIG. 17 is a perspective view showing the gradient meter shown in FIG. 16 mounted on a circular tube. The gradiometer (1) according to the fourth embodiment includes a fixed portion (2), a bubble tube (3),
The hugging member (10) as a mounting means.

The fixing portion (2) is a plate-like member which is curved in a substantially arc shape so as to extend substantially along the circumferential direction of the circular tube (6), and its inner diameter side surface is pressed against the surface of the circular tube. It is a member that can match the axial length direction of a circular tube with its own axial length direction. The fixing part (2) can basically have the same configuration as that of the second embodiment. As the material, for example, a metal or synthetic resin can be adopted, and as the synthetic resin, for example, hard vinyl chloride can be mentioned.

The bubble tube (3) is provided on the outer diameter side of the fixed portion (2). The bubble tube (3) corresponds to a display portion of the tube gradient or the horizontal or vertical degree of the tube, and is formed by enclosing bubbles and liquid in a transparent closed tube. The bubble tube (3) may be fixed to the fixing portion (2) as shown in FIGS. 16 and 17, but may be attached to the fixing portion (2) by changing the direction. By making the direction of the bubble tube (3) changeable, the verticality and horizontality of the tube can be accurately measured with one bubble tube (3).

The fixed part (2) is preferably provided with knob pieces (9), (9). Picking pieces (9), (9)
By providing the circular tube (6), it is possible to prevent the bubble tube (3) from being damaged by pinching the bubble tube (3) when the gradient meter (1) is attached to or detached from the circular tube (6). The gradient meter (1) can be easily attached and detached.

The embracing member (10) extends from both ends (7) and (7) of the arc of the fixed portion (2), and is attached in a direction in which the circular tube (6) is tightened by the elastic member (11). It is a member that is energized. The shape of the embracing member (10) is not particularly limited, but, for example, as shown in the drawing, a wire made of metal or the like can be formed by bending in a quadrangular shape. The hugging member (10) is a circular tube (6).
The curved shape along the surface of is preferable in order to securely wrap it. Examples of the elastic member (11) include various springs such as a coil spring or a leaf spring.

The gradient meter (1) according to the fourth embodiment is
The hugging member (10) allows the circular pipe (6) to be easily and surely attached to the circular pipe (6) during plumbing work. Also,
At the time of mounting, the axial length direction of the gradiometer (1) and the axial length direction of the circular tube (6) can be surely aligned with each other to accurately measure the pipe gradient, and the structure can be made compact.

In the fourth embodiment, a shape memory alloy member (not shown) may be provided instead of the elastic member (11). This shape memory alloy member has a temperature substantially equal to that of the surface of the circular tube (6), so that the holding member (1
0) is deformed into a shape that biases the circular tube (6) toward the circular tube (6). Further, in the third and fourth embodiments, two bubble tubes (3) may be provided (FIG. 1).
8). When two pieces are provided, the bubble tubes (3) and (3) are arranged at positions where the central angle of the arc connecting the bubble tubes (3) is 90 ° in the fixed portion (2). At this time,
The axial direction of the bubble tubes (3) and (3) is the fixed part (2).
Are arranged so as to be orthogonal to the axial direction of the. By arranging the bubble tubes (3) and (3) in such a manner, the horizontality and verticality of the circular tube (6) can be quickly measured.

[0041]

The gradiometer according to the present invention can be easily and surely attached to a circular pipe during piping work. Also,
At the time of mounting, the axial length direction of the gradiometer and the axial length direction of the circular pipe can be surely matched to accurately measure the pipe slope or the verticality or horizontality of the pipe, and the structure can be made compact. .

[Brief description of drawings]

1A and 1B are diagrams showing a first embodiment of a gradient meter according to the present invention, in which FIG. 1A is a front view thereof, and FIG. 1B is a side view thereof.
(C) is a view on arrow A direction in (a).

FIG. 2 is a diagram showing a state where the gradient measuring device of the gradient meter shown in FIG. 1 is mounted on a circular tube.

FIG. 3 is a diagram showing another example of the gradient meter according to the first embodiment.

FIG. 4 is a view showing a state in which the gradient meter shown in FIG. 3 is attached to a circular tube.

FIG. 5 is a diagram showing still another example of the gradient meter according to the first embodiment.

FIG. 6 is a diagram showing still another example of the gradient meter according to the first embodiment.

7A and 7B are diagrams showing a second embodiment of a gradient meter according to the present invention, in which FIG. 7A is a front view thereof, and FIG. 7B is a side view thereof.
(C) is a B direction arrow view in (a).

FIG. 8 is a perspective view showing a third embodiment of a gradient meter according to the present invention.

9 is a diagram showing a state in which the gradient meter shown in FIG. 8 is mounted on a circular tube.

FIG. 10 is a perspective view showing another example of the gradient meter according to the third embodiment.

FIG. 11 is a perspective view showing still another example of the gradient meter according to the third embodiment.

FIG. 12 is a view showing still another example of the gradient meter according to the third embodiment.

13 is a view from the direction of the arrow of the inclinometer shown in FIG.

14A and 14B are views showing an example of the direction changing means of a bubble tube in the third embodiment, FIG. 14A showing a magnet, and FIG.
FIG. 6 is a diagram showing an iron member.

FIG. 15 is a diagram showing a state in which the magnet and the iron member shown in FIG. 14 are mutually attracted and fitted.

FIG. 16 is a perspective view showing a fourth embodiment of a gradient meter according to the present invention.

17 is a perspective view showing a state in which the gradient meter shown in FIG. 16 is mounted on a circular tube.

FIG. 18 is a perspective view showing still another example of the gradient meter according to the third embodiment.

[Explanation of symbols]

1 ... inclinometer 2 fixing part 3 ... Bubble tube 4 ... Adhesive 6 ... Circular tube 7 ... Both ends of arc 9: picked pieces 10 ... Hugging member 11 ··· Elastic member 14 ... Adhesive tape

Claims (8)

[Claims] 1. A gradiometer mounted on the outer surface of a circular pipe for measuring the inclination, horizontality, or verticality of the circular pipe during piping work of the circular pipe, the circumferential direction of the circular pipe. A fixed portion that is a plate-shaped member that is curved in a substantially arc shape so as to substantially follow the inner diameter side surface of the circular tube by pressing it against the surface of the circular tube and the axial length direction of the circular tube can match the axial length direction of the circular tube.
A gradient meter, comprising: a bubble tube provided on the outer diameter side of the fixed portion. 2. A gradiometer mounted on the outer surface of a circular pipe in order to measure the inclination, horizontality, or verticality of the circular pipe during piping work of the circular pipe. Is a long plate-shaped member that is curved in a substantially arc shape and extends in the direction along the axial direction of the circular pipe, and the inner diameter side surface is pressed against the surface of the circular pipe so that the axial direction of the circular pipe And a plurality of bubble tubes provided on the outer diameter side of the fixed portion at predetermined intervals in the axial length direction of the fixed portion, and It is composed of an adhesive provided on the inner diameter side or an adhesive tape extending from both arc end portions of the fixing portion, and the fixing portion is configured to be separable at a portion between adjacent bubble tubes. Characteristic gradient meter. 3. A gradiometer mounted on the outer surface of a circular pipe in order to measure the inclination, levelness or verticality of the circular pipe during piping work of the circular pipe, the circumferential direction of the circular pipe. A fixed portion that is a plate-shaped member that is curved in a substantially arc shape so as to substantially follow the inner diameter side surface of the circular tube by pressing it against the surface of the circular tube and the axial length direction of the circular tube can match the axial length direction of the circular tube.
A bubble tube provided on the outer diameter side of the fixing portion, and an adhesive provided on the inner diameter side of the fixing portion or an adhesive tape extending from both arc ends of the fixing portion. And a gradient meter. 4. A gradiometer mounted on the outer surface of a circular pipe in order to measure the inclination, levelness or verticality of the circular pipe during plumbing work of the circular pipe, the circumferential direction of the circular pipe. A fixed portion that is a plate-like member that is curved in a substantially arc shape so as to substantially follow the inner diameter side surface of the circular tube by pressing the surface on the inner diameter side and the axial direction of the circular tube to match the axial length direction of the circular tube. And a bubble tube provided on the outer diameter side of the fixed portion, wherein the fixed portion is composed of elastic members at least in the vicinity of both ends of the arc, and the length of the arc is such that the circular tube can be held. A gradiometer which is capable of being attached to a circular tube through a step of expanding the diameter of the elastic member. 5. A gradiometer mounted on the outer surface of a circular pipe in order to measure the inclination, levelness or verticality of the circular pipe during plumbing of the circular pipe, the circumferential direction of the circular pipe. A fixed portion that is a plate-shaped member that is curved in a substantially arc shape so as to substantially follow the inner diameter side surface of the circular tube by pressing it against the surface of the circular tube and the axial length direction of the circular tube can match the axial length direction of the circular tube.
It comprises a bubble tube provided on the outer diameter side of the fixed portion, and a hugging member extending from both ends of an arc of the fixed portion and urged in a direction to tighten the circular tube by elastic members. Characteristic gradient meter. 6. A shape memory alloy member is provided in place of the elastic member, and the shape memory alloy member causes the embracing member to become a circular tube when the temperature becomes substantially equal to the surface of the circular tube surface. The inclinometer according to claim 5, wherein the inclinometer is deformed into a shape that urges toward. 7. The gradiometer according to claim 1, wherein a knob is provided on the fixing portion. 8. The gradiometer according to claim 1, wherein the bubble tube is mounted on the fixed portion so as to be capable of changing its direction.