JP2024087885A - Jig for confirming connection of pipe joint - Google Patents

Abstract

To provide a jig for confirming connection of a pipe joint that makes it possible to smoothly confirm a joined state of the pipe joint.SOLUTION: A jig for confirming connection of a pipe joint has a first measurement portion 2, a second measurement portion 3 provided so as to be rotatable around an axis with respect to the first measurement portion 2, and a third measurement portion 4 capable of sliding in a length direction of the second measurement portion 3 and being housed in the second measurement portion 3. The first measurement portion 2, the second measurement portion 3 and the third measurement portion 4 are different in thickness. The first measurement portion 2 and the second measurement portion 3 form an angle meter for measuring an angle between connected pipe bodies. The first measurement portion 2, the second measurement portion 3, and the third measurement portion 4 are configured to function as a check gauge for confirming an installation position of an object or a gap gauge for confirming a size of a gap.SELECTED DRAWING: Figure 1

Description

This invention relates to a joint checking jig for checking the joint condition of pipe joints.

When laying a water pipeline in a curved shape, a curve may be formed by bending a straight pipe joint instead of using a curved pipe. When bending a joint in this way, as shown in Fig. 9, the dimensions a1 and a2 between the annular white line 31 formed on the end of the insertion side pipe 30 and the receiving end face of the receiving side pipe 32 are measured on the outside and inside of the bend of the joint, respectively, and the bending angle θ of the joint is calculated based on the following formula (1) to confirm whether the bending angle θ is as designed.
θ=tan ⁻¹ ((a1−a2)/D) (1)

When calculating this bending angle θ, if the pipe joint is bent both in the horizontal and vertical planes, it is necessary to measure the above dimensions at the top, side, and bottom of the joint in the excavation trench, but it is often difficult to measure at the bottom of the pipe. Therefore, for example, in Patent Document 1 below, branch scales are rotatably attached to both ends of the main scale, and the bending angle is directly measured by aligning the main scale and each branch scale along the pipe body (see Figures 1 and 18 of Patent Document 1). In addition, Patent Document 2 below discloses a protractor that digitally displays the angle between a fixed ruler part and a rotating ruler part (see Figure 1 of Patent Document 2, etc.).

Utility Model Registration No. 3128819 Japanese Utility Model Application Publication No. 62-180595

When connecting a GX-type straight pipe joint, in addition to measuring the bending angle of the joint, a check gauge of a specified thickness (e.g., 2 mm or 4 mm) is used to check whether the rubber ring installed between the socket and the insertion port is in the specified axial position. Also, when connecting a special-shaped pipe joint, a gap gauge of a specified thickness (e.g., 0.5 mm) is used to check the gap between the push ring and the socket. For this reason, multiple types of measuring tools such as the angle gauge 33, check gauge 34, and gap gauge 35 shown in Figures 10 to 12 are required for pipe connection work. Since visibility is poor inside the excavation trench and it is difficult to properly manage multiple measuring tools, this may lead to an increase in the time required to connect the joint. In addition, since the check gauge 34 and gap gauge 35 are relatively light, there is a risk of them being lost during work. In particular, when muddy water accumulates in the excavation trench, it may be difficult to find the measuring tools once they are dropped into the trench.

Therefore, the objective of this invention is to make it possible to smoothly check the connection status of pipe joints.

In order to solve the above problems, the present invention provides:
A first measurement unit;
A second measurement unit provided so as to be rotatable about an axis relative to the first measurement unit;
A third measurement part that can be slid in the length direction of the second measurement part and stored in the second measurement part;
The first measuring part, the second measuring part, and the third measuring part all have different thicknesses, and the first measuring part and the second measuring part form a goniometer that measures the angle between connected pipe bodies, and the first measuring part, the second measuring part, and the third measuring part form a pipe joint connection confirmation jig that functions as a check gauge that confirms the installation position of an object or a gap gauge that confirms the size of the gap.

In this way, the functions of an angle gauge, check gauge, and gap gauge are all contained in one jig, eliminating the need to manage each measuring tool individually. Also, by grouping all the measuring tools together, loss of the tools within the excavation trench can be prevented as much as possible. This makes it possible to smoothly check the connection status of pipe joints.

In the above configuration, it is preferable to have a tab that makes it easier to slide the third measurement unit stored in the second measurement unit. This makes it easier to pull out the third measurement unit from the second measurement unit, improving work efficiency.

In each of the above configurations, a reference jig for positioning the first measurement unit or the second measurement unit relative to the pipe body can also be included. In this way, the pipe joint connection confirmation jig can be accurately attached to a specified position on the pipe body (the top and side of the pipe), improving the accuracy of measuring the bending angle.

In this invention, the goniometer is made up of a first measuring part and a second measuring part, and the first measuring part, the second measuring part, and the third measuring part that can be stored in the second measuring part, all of which have different thicknesses, are configured to function as a check gauge or gap gauge. This means that the functions of the goniometer, check gauge, and gap gauge are contained in one jig, eliminating the need to manage each measuring tool individually. In addition, by grouping all the measuring tools together, it is possible to minimize loss of the measuring tools within the excavation trench. This allows the work of checking the connection status of the pipe joint to be carried out smoothly.

1A is a plan view, FIG. 1B is a front view, FIG. 1C is a right side view, FIG. 1D is a rear view, and FIG. 1E is a bottom view of a first embodiment of a jig for checking connection of a pipe joint according to the present invention. FIG. 2 is a plan view of a main part of the bonding confirmation jig shown in FIG. 1 , showing a state in which a third measurement part is protruding from a second measurement part; The figure shows how the angle of a pipe joint is measured with the angle gauge of the joint confirmation jig shown in FIG. 1, where (a) is the measurement at the side of the pipe, and (b) is the measurement at the top of the pipe. A cross-sectional view showing the state in which the installation position of the target object (rubber ring) is being confirmed with the check gauge of the joint confirmation jig shown in Figure 1. FIG. 2 is a cross-sectional view showing a state in which the gap between the press ring and the socket is being checked with a gap gauge of the joint checking jig shown in FIG. 2A is a plan view showing a modified example of the bonding confirmation jig shown in FIG. 1, in which (a) shows a case in which the notch portion is formed in an arc shape, and (b) shows a case in which the tip of the third measurement portion is protruded to form a pinch portion without forming a notch portion. 2A is a plan view showing a modified example of the bonding confirmation jig shown in FIG. 1, in which (a) indicates the thickness of each measurement portion, and (b) indicates the measurement portions by color. 5A and 5B are views showing a state in which a second embodiment of a pipe joint connection confirmation jig according to the present invention is used, in which FIG. 5A is a plan view, and FIG. 5B is a cross-sectional view taken along the pipe axis direction. A side view showing a conventional method for calculating a bending angle Plan view showing a typical angle gauge FIG. 1 shows a typical check gauge, where (a) is a plan view and (b) is a front view. FIG. 1 shows a typical gap gauge, where (a) is a plan view and (b) is a front view.

A first embodiment of the pipe joint confirmation jig 1 (hereinafter, abbreviated as confirmation jig 1) according to the present invention is shown in Figures 1 and 2. This confirmation jig 1 is a jig used when checking the connection state of pipe joints of ductile iron pipes, and its main components are a first measuring part 2, a second measuring part 3, and a third measuring part 4.

The first measuring part 2 is a ruler-like member with a thickness of 0.5 mm and a length of approximately 10 cm, with a scale formed on its surface. A rotating shaft 5 is provided on one end of the first measuring part 2.

The second measuring part 3 is a ruler-like member with a thickness of 4 mm and a length of approximately 10 cm, with a scale formed on its surface. The second measuring part 3 is provided so as to be freely rotatable about its axis relative to the first measuring part 2 by means of a rotating shaft body 5. Inside the second measuring part 3, an internal insertion recess 6 is formed, which opens at the end on the rotating tip side of the second measuring part 3. A V-shaped notch 7 is formed at the open end of the internal insertion recess 6.

The first measuring unit 2 and the second measuring unit 3 constitute a goniometer that measures the angle between the connected pipes. The second measuring unit 3 is provided with an angle display unit 8 that displays the angle between the first measuring unit 2 and the second measuring unit 3. The angle display unit 8 displays 0 degrees when the first measuring unit 2 and the second measuring unit 3 are exactly overlapping, and 90 degrees when the first measuring unit 2 and the second measuring unit 3 are perpendicular to each other.

The third measuring part 4 is a ruler-like member with a thickness of 2 mm and a length shorter than that of the second measuring part 3, with a scale formed on its surface. The third measuring part 4 can be slid into the insertion recess 6 formed in the second measuring part 3 in the length direction. The tip of the third measuring part 4 is a tab 9 that is slightly exposed from the cutout 7 formed in the second measuring part 3 when in the stored state, and is configured so that the third measuring part 4 stored in the second measuring part 3 can be easily slid out and pulled out.

The material of each measuring section 2, 3, 4 is not particularly limited and can be appropriately selected from metal, resin, etc.

In the confirmation jig 1 according to this embodiment, as shown in Table 1, the second measuring part 3 (thickness 4 mm) and the third measuring part 4 (thickness 2 mm) are used as check gauges to check the installation position of objects such as rubber rings used when joining straight pipe joints, and the first measuring part 2 (thickness 0.5 mm) is used as a gap gauge to check the size of the gap between the pressure ring and the socket. The P-Link shown in Table 1 is a connection member that is fixed to the insertion port of a GX-type cut pipe and connected to the straight pipe socket, and the N-Link is a connection member that is fixed to the insertion port of an NS-type (E-type) cut pipe and has the same function as a pressure ring when connecting to the socket of a special-shaped pipe.

The use of the confirmation jig 1 according to this embodiment will be described with reference to the drawings. When measuring the horizontal bending angle of the pipe joint, as shown in FIG. 3(b), the first measuring part 2 is aligned along the pipe axis direction at the pipe horizontal position of the insertion side pipe body 10, and the second measuring part 3 is aligned along the end face of the socket of the receiving side pipe body 11. Then, in this state, the angle θ _MH displayed on the angle display part 8 is read. When measuring the vertical bending angle of the pipe joint, as shown in FIG. 3(a), the first measuring part 2 is aligned along the pipe axis direction at the pipe top position of the insertion side pipe body 10, and the second measuring part 3 is aligned along the end face of the socket of the receiving side pipe body 11. Then, in this state, the angle θ _MV displayed on the angle display part 8 is read.

When determining the pipe lateral position and pipe apex position, it is preferable to use a reference jig equipped with a level in order to improve measurement accuracy and workability. If it is clear that the bending direction is only one of the horizontal and vertical directions, it may be possible to omit measuring the bending angle in the other direction.

In calculating the composite bending angle θ from the bending angles θ _MH and θ _MV in the horizontal and vertical directions, first, the bending angle θ _H in the horizontal plane and the bending angle θ _V in the vertical plane are calculated based on the following equations (2) and (3), respectively.
θ _H =|θ _MH −90| (2)
θ _V =|θ _MV -90| (3)

Furthermore, a composite bending angle θ is calculated based on the bending angle θ _H in the horizontal plane and the bending angle θ _V in the vertical plane according to the following formula (4).
θ=cos ⁻¹ (cos _{θ H} · cos θ _V ) (4)

When checking the installation position of the rubber ring 12 between the receiving port of the receiving side pipe 11 and the insertion port of the insertion side pipe 10 during straight pipe joint joining, P-Link joint joining, etc. (see Table 1), as shown in Figure 4, a third measuring part 4 with a thickness of 2 mm that functions as a check gauge is inserted into the gap between the receiving side pipe 11 and the insertion side pipe 10 from the pipe axis direction. If the insertion amount c of the third measuring part 4 is within a predetermined range over the entire circumference, it is judged as passing. On the other hand, if the check using the third measuring part 4 results in a failure, a recheck is performed using the second measuring part 3 with a thickness of 4 mm. If the insertion amount c of the second measuring part 3 is within the predetermined range in this recheck, it is judged as passing. On the other hand, if the recheck using the second measuring part 3 again results in a failure, the joint is disassembled and inspected.

When checking the gap between the pressure ring 13 and the socket 14 of the receiving pipe 11 when joining a special-shaped pipe joint or a straight pipe joint, or when joining an N-Link (see Table 1), as shown in Figure 5, a first measuring part 2 with a thickness of 0.5 mm that functions as a gap gauge is pressed against the construction management protrusion 15 formed on the pressure ring 13 and the end face of the socket 14, and it is judged over the entire circumference whether the size of the gap between the construction management protrusion 15 and the socket 14 is appropriate. If it is judged to be inappropriate, the amount of tightening of the nut 16 provided on the pressure ring 13 is adjusted, etc.

The above-mentioned inspection jig 1 combines the functions of a goniometer, check gauge, and gap gauge in one jig, eliminating the need to manage each measuring tool individually. In addition, since all the measuring tools are grouped together, it is heavy, which makes it possible to minimize loss of the tools in the excavation trench. This allows the work of inspecting the connection status of pipe joints to be carried out smoothly.

The above-mentioned confirmation jig 1 has a notch 7 formed in the second measuring part 3, which provides a tab 9 that makes it easy to slide the third measuring part 4 stored in the second measuring part 3. This makes it easy to pull out the third measuring part 4 from the second measuring part 3, improving work efficiency.

In the above-mentioned confirmation jig 1, the pinch-out portion 9 is formed by forming a V-shaped cutout portion 7 in the second measuring portion 3. However, as shown in FIG. 6(a), the pinch-out portion 9 can also be formed by forming an arc-shaped cutout portion 7 in the second measuring portion 3, or as shown in FIG. 6(b), the pinch-out portion 9 can be formed by limiting the insertion depth of the third measuring portion 4 into the second measuring portion 3 without forming a cutout portion 7 in the second measuring portion 3.

In the above-mentioned confirmation jig 1, as shown in Fig. 7(a), the thickness of each measuring part 2, 3, 4 can be prominently displayed on the surface, or as shown in Fig. 7(b), each measuring part 2, 3, 4 can be color-coded according to its thickness (different patterns on the surface of each measuring part 2, 3, 4 correspond to different colors). In this way, it is possible to prevent mistakes in measuring by mixing up measuring parts 2, 3, 4 of different thicknesses, and to shorten the time required for the measurement work.

A second embodiment of the confirmation jig according to the present invention is shown in Figures 8(a) and (b). This confirmation jig 1 has a first measuring unit 2, a second measuring unit 3, and a third measuring unit 4, and is the same as the confirmation jig 1 according to the first embodiment in that the first measuring unit 2 and the second measuring unit 3 form a goniometer, and the measuring units 2, 3, and 4 form a check gauge or gap gauge. However, it differs in that the second measuring unit 3 is provided with a reference jig 17 for positioning it relative to the tube.

The reference jig 17 is provided on the outer periphery of the insertion side tube 10 and has a substantially rectangular base 18 through which the second measuring section 3 penetrates. A level 19 is provided on the radially outer surface and one circumferential surface of the base 18 to detect the horizontal state in a direction perpendicular to the tube axis direction. This level 19 is an air bubble level. When each level 19 is set on the insertion side tube 10 so that it is the upper surface of the base 18, it is arranged in such a direction that the internal air bubble indicating the horizontal state can move along the circumferential direction of the insertion side tube 10. The inner surface of the base 18 (the surface facing the insertion side tube 10) is formed in an inverted V shape when viewed from the side, and the insertion side tube 10 and the base 18 abut (make a line contact) at two points in the circumferential direction of the insertion side tube 10.

By providing the reference jig 17 together with the checking jig 1, the positions of the tube top and tube side of the insertion side tube 10 can be accurately checked, and the measurement accuracy of the bending angles θ _MH and θ _MV in the horizontal and vertical directions can be improved. In addition, since the inner surface of the base 18 is formed in an inverted V shape, a common reference jig 17 can be used regardless of the nominal diameter of the insertion side tube 10, and there is no need to prepare many reference jigs 17 corresponding to the nominal diameter, thereby reducing costs. In addition, if a magnet is provided in the inverted V-shaped portion of the base 18 and this magnet is attracted to the outer circumferential surface of the insertion side tube 10, the checking jig 1 can be set stably.

In the confirmation jig 1 according to each of the above embodiments, the thickness of the first measuring part 2 is 0.5 mm, the thickness of the second measuring part 3 is 4 mm, and the thickness of the third measuring part 4 is 2 mm, and the third measuring part 4 is stored in the second measuring part 3. However, for example, the thickness of the first measuring part 2 can be 2 mm, the thickness of the second measuring part 3 can be 4 mm, and the thickness of the third measuring part 4 can be 0.5 mm, and the third measuring part 4 can be stored in the first measuring part 2 or the second measuring part 3. In this way, damage to the thin-walled third measuring part 4 can be prevented as much as possible. In addition, the first measuring part 2 and the second measuring part 3 can be configured to store thin-walled measuring parts with different thicknesses. In this way, convenience during measurement can be improved. The thickness of each measuring part 2, 3, and 4 can be changed appropriately based on the joint evaluation criteria for pipe joints.

The embodiments disclosed herein are illustrative in all respects and should not be considered limiting. Therefore, the scope of the present invention is indicated by the claims, not by the above description, and is intended to include the equivalent meanings and all modifications of the claims.

1. Pipe joint connection confirmation jig (confirmation jig)
2 First measuring part 3 Second measuring part 4 Third measuring part 5 Rotating shaft body 6 Insertion recess 7 Notch part 8 Angle display part 9 Knob part 10 Insertion side tube body 11 Receiving side tube body 12 Rubber ring 13 Pressing ring 14 Socket 15 Construction management protrusion 16 Nut 17 Reference jig 18 Base part 19 Level

Claims (3)

A first measuring unit (2);
a second measurement unit (3) provided rotatably about an axis relative to the first measurement unit (2);
a third measuring part (4) that can be slid in the length direction of the second measuring part (3) and stored in the second measuring part (3);
a first measuring portion (2), a second measuring portion (3), and a third measuring portion (4) each having a different thickness, the first measuring portion (2) and the second measuring portion (3) forming a goniometer for measuring the angle between connected pipe bodies, and the first measuring portion (2), the second measuring portion (3), and the third measuring portion (4) functioning as a check gauge for checking the installation position of an object or a gap gauge for checking the size of a gap. The pipe joint confirmation jig according to claim 1 has a tab (9) that makes it easier to slide the third measuring part (4) housed in the second measuring part (3). The pipe joint confirmation jig according to claim 1 or 2 further comprises a reference jig (17) for positioning the first measuring part (2) or the second measuring part (3) relative to the pipe body.

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