JP2022154692A - Clamp and electric fusion joint unit - Google Patents

Abstract

To provide a clamp capable of securing an alignment performance between resin pipes even in a case where a joint is heavy, while suppressing cost.SOLUTION: The present invention relates to a resin clamp 100 holding a resin pipe P and an electric fusion joint F to which the resin pipe P is connected by heat fusion. The clamp comprises: fastening belt parts 10 including a pipe fastening belt portion 11 in a belt shape whose diameter can be reduced so as to hold the resin pipe P in a state where the resin pipe P is disposed inside of the electric fusion joint F, and a joint fastening belt portion 12 in a belt shape whose diameter can be reduced so as to hold the electric fusion joint F; and engage parts 20 which are engaged with each other in a circumferential direction circulating around the fastening belt parts 10 in an axial direction, thereby maintaining a diameter reduced state of the fastening belt parts 10. The engage parts 20 include a pipe-side engage portion 21 provided in the pipe fastening belt portion 11 and a joint-side engage portion 22 provided in the joint fastening belt portion 12. In the engage parts 20, engage teeth which can be engaged with each other are formed, and the joint fastening belt portion 12 and the pipe fastening belt portion 11 are coupled in the axial direction by a coupling part 30.SELECTED DRAWING: Figure 9

Description

The present invention relates to clamps and electrofusion joint units.

Conventionally, an electric fusion joint is known in which resin pipes made of thermoplastic resin are connected by heat fusion. When a current is passed through the power supply terminal with the resin pipe inserted inside the cylindrical electric fusion joint, the heating wire provided inside the electric fusion joint generates heat. This heat melts the outer peripheral surface of the resin pipe and fuses it with the inner peripheral surface of the electric fusion joint.
In the connecting work described above, the electrical fusion joint and the resin pipe may be misaligned during the heat fusion. In order to prevent this, a structure is disclosed in which a resin pipe is held by a resin clamp attached to a power supply terminal of an electric fusion joint during cooling in heat fusion (for example, Patent Document 1).

JP 2019-211063 A

As for the amount of positional deviation allowed for the electric fusion joint and the resin pipe, for example, it is required that the relative angle between the central axis of the electric fusion joint and the central axis of the resin pipe is 3° or less. In addition, it is required that the amount of the resin pipe coming off from the electric fusion joint is within 1 mm.
However, in the conventional clamp, the clamping member that holds the tube and the holding portion that holds the power supply terminal are only partially integrated. For this reason, although it is strong against coming off in the pipe axial direction, there was a problem that the centering performance between resin pipes was weak when fusion-bonding medium-diameter and large-diameter resin pipes, which make the joint weight particularly heavy. .

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and is a clamp that can ensure centering performance between resin pipes even in the case of medium-diameter and large-diameter joints with heavy joint weights, while suppressing costs with an inexpensive structure. intended to provide

In order to solve the above problems, the present invention proposes the following means.
A clamp according to the present invention is a resin clamp that holds a resin pipe made of thermoplastic resin and an electrical fusion joint to which the resin pipe is connected by thermal fusion, wherein the resin pipe is the electrical A band-shaped pipe clamping belt part whose diameter can be reduced so as to hold the resin pipe and a band-shaped joint clamp whose diameter can be reduced so as to hold the electric fusion joint in a state arranged inside the fusion joint and an engaging portion that engages with each other in a circumferential direction around the axial direction of the tightening band to maintain the diameter-reduced state of the tightening band. , the engaging portion includes a pipe-side engaging portion provided on the pipe tightening band and a joint-side engaging portion provided on the joint tightening band; Engageable engagement teeth are formed, and the joint tightening band and the pipe tightening band are connected in the axial direction by a connecting portion.

According to this invention, the joint tightening band and the pipe tightening band are connected in the axial direction by the connecting portion. That is, the pipe tightening band and the joint tightening band are integrally provided around the resin pipe and the electric fusion joint.
Thereby, depending on the shape of the clamp, not only the resin pipe but also the electric fusion joint can be held at the same time. Therefore, it is possible to prevent misalignment and angle between the resin pipe and the joint. As a result, it is possible to prevent an angle from occurring between the resin pipes inserted into the electric fusion joint. Therefore, it is possible to improve the centering performance between the resin pipes.

Furthermore, since the clamp according to the present invention does not require special materials or the like, it can be constructed at a low cost. For this reason, even if it is mass-produced, there is no impact on cost, so work can be efficiently performed at a plurality of locations.

Further, the engaging portion is provided at an end portion of the tightening band portion in the circumferential direction, and the end portion of the joint tightening band portion and the end portion of the pipe tightening band portion are connected by the connecting portion. The tube-side engaging portion and the joint-side engaging portion may be independent of each other.

According to this invention, the tube-side engaging portion and the joint-side engaging portion are independent of each other. As a result, the engaging portion of the pipe tightening band and the engaging portion of the joint tightening band can be independently moved while maintaining the integrity of the pipe tightening band and the joint tightening band. Therefore, since it is not necessary to reduce the diameters of the pipe tightening band and the joint tightening band at the same time, the work can be facilitated.

Further, the circumferential length of the joint tightening band may be longer than the circumferential length of the pipe tightening band.

According to this invention, the circumferential length of the joint tightening band is longer than the circumferential length of the pipe tightening band. That is, the outer diameter that the joint tightening band can hold is larger than the outer diameter that the pipe tightening band can hold. Therefore, a single clamp can hold a resin pipe and an electrofusion joint having different outer diameters.

Further, the axial length of the joint tightening band may be longer than the axial length of the pipe tightening band.

According to this invention, the axial length of the joint tightening band is longer than the axial length of the pipe tightening band. Here, the electric fusion joint is relatively heavy with respect to the resin pipe. On the other hand, since the axial length of the joint tightening band is longer than the axial length of the pipe tightening band, the electric fusion joint can be held more reliably by the joint tightening band.

Further, the pipe-side engaging portion and the joint-side engaging portion may be separated from each other in the radial direction of the resin pipe.

According to this invention, the pipe side engaging portion and the joint side engaging portion are separated from each other in the radial direction of the resin pipe. Here, if the pipe-side engaging portion and the joint-side engaging portion are located at the same position in the radial direction, the diameter reduction of the pipe-hand tightening band portion and the diameter-reduction of the joint tightening band portion are performed simultaneously by a tool, hand, or the like. sometimes As a result, there is a risk that the diameter reduction described above will not be performed sufficiently. On the other hand, since the pipe side engaging portion and the joint side engaging portion are separated from each other in the radial direction, the diameter reduction of the pipe clamping band portion and the diameter reduction of the joint clamping band portion are performed simultaneously. can be avoided. Therefore, it is possible to prevent the above-described problem from occurring.

Further, it may be characterized in that at least one protruding portion is provided on each of the inner peripheral surfaces of the pipe tightening band portion and the joint tightening band portion.

According to this invention, at least one protruding portion is provided on each of the inner peripheral surfaces of the pipe tightening band and the joint tightening band. In other words, when the tube clamping band and the joint clamping band are contracted, only the protrusion contacts the resin pipe and the electrofusion joint, respectively. As a result, the tightening force of the tightening band concentrates on the protruding portion, so that the holding force of the tightening band can be improved.

Further, the joint tightening band may be characterized by being provided with a notch corresponding to the shape of the electric fusion joint.

According to this invention, the joint tightening band is provided with a notch corresponding to the shape of the electric fusion joint. Here, a power supply terminal and an indicator are sometimes provided near the end of the electric fusion joint. By providing a notch corresponding to such a shape, the clamp can be attached without interfering with the electric fusion joint.

Further, the connecting portion may be provided with at least one or more insertion confirmation openings for confirming an insertion state of the resin pipe into the electric fusion joint.

According to this invention, the connecting portion is provided with the insertion confirmation opening. Thereby, it is possible to visually confirm that the resin pipe is inserted into the electric fusion joint before starting the fusion work by the electric fusion joint.

Further, the tightening band portion may be divided in the circumferential direction, and an assembly portion for assembling the divided tightening band portions to each other may be provided at the divided portion.

According to this invention, the tightening band is divided in the circumferential direction. Here, if the tightening band portion is not divided, the clamp is moved along the axial direction of the resin pipe in a state where the clamp is inserted into the resin pipe when aligning the electric fusion joint. There is a need. At this time, if the length of the resin pipe is short, it may not be possible to sufficiently move the clamp. On the other hand, since the clamp is divided, the divided tightening band portion is brought close to the resin pipe from the outside in the radial direction without moving on the resin pipe, and then the engaging portion is engaged. The clamp can be directly attached to the electric fusion joint by assembling the assembling portion.

Further, an electric fusion joint unit according to the present invention includes an electric fusion joint that connects the resin pipes by heat fusion, and the clamp.

ADVANTAGE OF THE INVENTION According to this invention, the clamp which can secure the centering performance of resin pipes even in the case of the medium-diameter and large-diameter joints with a heavy joint weight can be provided, while suppressing cost as an inexpensive structure.

1 is a perspective view of a clamp according to one embodiment of the invention; FIG. 2 is a front view of the clamp shown in FIG. 1; FIG. Figure 2 is a plan view of the clamp shown in Figure 1; Figure 2 is a side view of the clamp shown in Figure 1; 2 shows a first example of attaching the clamp shown in FIG. 1 to the electric fusion joint and the resin pipe. FIG. 6 is a cross-sectional view in the VI-VI direction of FIG. 5; 2 shows a first example of attaching the clamp shown in FIG. 1 to the electric fusion joint and the resin pipe. FIG. 8 is a cross-sectional view in the VIII-VIII direction of FIG. 7; 1. It is a figure which shows the connection process of an electrofusion joint and a resin pipe using the clamp shown in FIG. FIG. 10 is a view showing a state in which the resin pipe is inserted into the electric fusion joint in FIG. 9; 4 is a variant in which the clamp according to the invention is split at the tightening band; Figure 12 is a front view of the clamp shown in Figure 11; 12 is a plan view of the female clamp of the clamp shown in FIG. 11; FIG. FIG. 11 is a side view of the clamp in the first direction. FIG. 11 is a side view of the clamp in a second direction. FIG. 12 is a schematic diagram showing a process of attaching the clamp shown in FIG. 11 to a pipe; Figure 12 shows the clamp shown in Figure 11 attached to a connected tube and electrofusion joint; It is an example of construction of the clamp shown in FIG.

A clamp 100 according to an embodiment of the present invention will now be described with reference to the drawings.
The clamp 100 shown in FIG. 1 is used when the resin pipe P and the electric fusion joint F are fused by the following steps. Specifically, in a state in which a resin pipe P made of a thermoplastic resin is inserted into the electric fusion joint F, a current is applied from a terminal T provided on the electric fusion joint F. As shown in FIG. Then, a heating wire (not shown) of the electrofusion joint F generates heat. As a result, the surfaces of the electric fusion joint F and the resin pipe P are heat-sealed.

By attaching the clamp 100 according to the present embodiment to the connecting portion between the resin pipe P and the electric fusion joint F when performing the above-described process, the position and the central axis of the resin pipe P and the electric fusion joint F are adjusted. It has a role to prevent slippage. After the resin pipe P and the electric fusion joint F are joined, the clamp 100 is left at the joint without being reused in other places.
The clamp 100 according to this embodiment is made of resin, and for example, hard vinyl chloride, impact-resistant hard vinyl chloride, polyacetal, nylon, or the like is preferably used.
In the following, when defining the direction of each component, the direction of the central axis of the electric fusion joint F is defined as the axial direction, the radial direction of the electric fusion joint F and the resin pipe P is defined as the radial direction, and the direction of rotation in the axial direction is defined as It may be called the circumferential direction.

The clamp 100 shown in FIGS. 1 and 2 includes a tightening strap portion 10, an engaging portion 20, and a connecting portion 30. As shown in FIG.
The tightening band 10 has a role of holding the resin pipe P and the electric fusion joint F in a state in which the resin pipe P is arranged inside the electric fusion joint F. As shown in FIG. The tightening band 10 includes a pipe tightening band 11 and a joint tightening band 12 .

The pipe tightening band 11 holds the resin pipe P inserted into the electric fusion joint F. As shown in FIG. The pipe tightening band portion 11 is a belt-shaped member that is annularly formed along the circumferential direction of the resin pipe P. As shown in FIG. The length in the circumferential direction of the pipe tightening belt portion 11 is longer than the outer diameter of the resin pipe P. Further, tube-side engaging portions 21 are formed at both ends of the strip (described later). In addition, the annular inner peripheral surface of the pipe clamping band portion 11 is provided with a pipe-side projection portion 11p.

At least one tube-side protrusion 11 p is provided on the inner peripheral surface of the tube clamping band 11 . As shown in FIG. 1, the tube-side protrusion 11p is provided in an annular shape along the belt-like shape of the tube clamping band 11. As shown in FIG. Alternatively, a plurality of tube-side protrusions 11p may be provided at intervals. The pipe-side protrusion 11p is a portion that comes into contact with the resin pipe P when the resin pipe P is held by the pipe clamping belt portion 11. As shown in FIG. The force for tightening the resin pipe P by the pipe tightening belt portion 11 concentrates on the pipe-side projection portion 11p, which serves to improve the holding force of the resin pipe P. As shown in FIG.

The joint tightening band portion 12 holds the electric fusion joint F in a state in which the resin pipe P is inserted into the electric fusion joint F. As shown in FIG. The joint tightening band portion 12 is a band-shaped member that is annularly formed along the circumferential direction of the electric fusion joint F. As shown in FIG. Here, the resin pipe P is inserted into the electric fusion joint F held by the joint tightening belt portion 12 . Therefore, the annular inner diameter of the joint tightening band 12 is larger than the inner diameter of the pipe tightening band 11 . The circumferential length of the joint tightening band portion 12 is longer than the circumferential length of the pipe tightening band portion 11 . Further, the axial length of the joint tightening band portion 12 , that is, the band-like width of the joint tightening band portion 12 is longer than the axial length of the pipe tightening band portion 11 .

The outer diameter of the electric fusion joint F is larger than the outer diameter of the resin pipe P at the opening of the electric fusion joint F into which the resin pipe P is inserted. The circumferential length of the joint tightening band portion 12 is longer than the outer diameter of the opening of the electric fusion joint F. Also, the joint tightening band 12 and the pipe tightening band 11 are connected by a connecting portion 30 (described later). Therefore, the end of the joint tightening band 12 facing the pipe tightening band 11 extends toward the center of the pipe tightening band 11 . That is, the joint tightening band portion 12 has an L-shaped cross section.

Joint-side engaging portions 22 are formed at both band-like end portions of the joint tightening band portion 12 (described later). Further, the annular inner peripheral surface of the joint tightening band portion 12 is provided with a joint-side projection portion 12p. Further, the joint tightening band portion 12 is provided with a notch portion 12h corresponding to the shape of the electric fusion joint F. As shown in FIG.
At least one joint-side projecting portion 12 p is provided on the inner peripheral surface of the joint tightening belt portion 12 . The joint-side projecting portion 12p is annularly provided along the belt-like shape of the joint tightening belt portion 12. As shown in FIG. Alternatively, a plurality of them may be provided at intervals. The joint-side projecting portion 12p is a portion that comes into contact with the electric fusion joint F when the joint tightening band portion 12 holds the electric fusion joint F. By concentrating on the side protruding portion 12p, it has a role of improving the holding force of the electric fusion joint F.

When attaching the joint tightening strap portion 12 to the electric fusion joint F, the notch portion 12h prevents the joint tightening strap portion 12 from being attached due to interference with the shape of the electric fusion joint F (especially the terminal T). The notch 12h is provided in accordance with the shape and size of the terminal T so as to correspond to the shape of the electric fusion joint F. As shown in FIG.
Here, the terminals T provided on the electric fusion joints F may differ in size and position depending on the type of the electric fusion joints F, even if the electric fusion joints F have the same diameter. For this reason, the cutout portion is formed so as to be able to correspond to a plurality of types of terminal T shapes.

As shown in FIG. 3, the notch 12h includes a first notch 12h1 and a second notch 12h2.
The first cutout portion 12h1 is a circular cutout provided relatively centrally in the axial direction of the joint tightening band portion 12 . As shown in FIGS. 7 and 8, the first notch 12h1 has a shape provided relatively near the end of the electric fusion joint F and corresponding to the terminal T having a relatively small diameter.

The second cutout portion 12h2 is a semicircular cutout provided on the end portion side of the joint tightening band portion 12 that does not face the pipe tightening band portion 11 in the axial direction. A part of the second notch 12h2 is connected to a part of the first notch 12h1. As shown in FIGS. 5 and 6, the second notch 12h2 is provided at a location relatively distant from the vicinity of the end of the electric fusion joint F and provided corresponding to the terminal T having a relatively large diameter. shape.

As described above, by providing the first cutout portion 12h1 and the second cutout portion 12h2 having different sizes, it is possible to correspond to a plurality of types of terminal shapes. Alternatively, the relatively large-diameter first notch 12h1 may be used for rough alignment, and the relatively small-diameter second notch 12h2 may be used for fine positioning.

The engaging portions 20 are provided at both ends of the belt-shaped fastening band portion 10 described above. The engaging portion 20 engages both end portions of the tightening band portion 10 in the circumferential direction so that the annular diameter of the tightening band portion 10 can be reduced. As a result, the tightening belt portion 10 has a role of tightening and holding the resin pipe P and the electric fusion joint F. The engaging portion 20 includes a tube-side engaging portion 21 and a joint-side engaging portion 22 .

The tube-side engaging portions 21 are provided at both strip-shaped ends of the tube tightening band portion 11 . The tube-side engaging portion 21 includes a tube-side male portion 21m and a tube-side female portion 21f.
The pipe-side male portion 21m is provided at one end of the belt-shaped pipe clamping band portion 11 . The tube-side male portion 21m includes a tube-side male engaging tooth 21mt and a tube-side male grip portion 21mg. The tube-side male engaging tooth 21mt is inserted into the tube-side female portion 21f and can be engaged with the tube-side female engaging tooth 21ft. The tube-side male grip portion 21mg is a portion of the tube-side male portion 21m on the side of the tube clamping band portion 11 that rises radially outward.

The tube-side female portion 21f is provided at the other strip-shaped end of the tube-clamping band portion 11 . The tube-side female portion 21f includes a tube-side female engaging tooth 21ft and a tube-side female grip portion 21fg.
The pipe-side female portion 21f on the side of the pipe-clamping belt portion 11 rises radially outward. Furthermore, the radially outer end of the raised portion further rises to the other belt-shaped end of the tube tightening belt portion 11 along the circumferential direction. Thereby, the tube-side female portion 21f has an L-shaped shape. A tube-side female portion 21f is formed by this L-shaped shape and the belt-like portion located at the other end of the tube-clamping belt portion 11. As shown in FIG.

The tube-side female part 21f has a tube-side female engaging tooth 21ft at a part that rises in the circumferential direction from the radially outer end of the above-mentioned raised part and faces the band of the tube clamping belt part 11. . The tube-side female engaging teeth 21ft are engaged with the tube-side male engaging teeth 21mt to prevent the tube-side male portion 21m from slipping out of the tube-side female portion 21f, thereby maintaining the diameter-reduced state of the tube fastening belt portion 11. have a role.
The tube-side female gripping portion 21fg refers to a portion of the tube-side female portion 21f that rises radially outward from the tube clamping band portion 11 in particular.

When inserting the tube-side male part 21m into the tube-side female part 21f, an inserting force is applied by simultaneously pinching the tube-side male gripping part 21mg and the tube-side female gripping part 21fg with a tool or hand. Further, when the tube-side male part 21m is inserted into the tube-side female part 21f, the tip of the tube-side female part 21f abuts against the tube-side male grip part 21mg. Thus, the tube-side male gripping portion 21mg also serves as a stopper that regulates the amount of insertion.

The joint-side engaging portions 22 are provided at both ends of the belt-shaped joint tightening belt portion 12 . The joint-side engaging portion 22 includes a joint-side male portion 22m and a joint-side female portion 22f.
The joint-side male portion 22m is provided at one end of the belt-shaped joint tightening belt portion 12 . The joint-side male portion 22m includes a joint-side male engaging tooth 22mt and a joint-side male grip portion 22mg. The joint-side male engaging tooth 22mt is inserted into the joint-side female portion 22f and can be engaged with the joint-side female engaging tooth 22ft. The joint-side male grip portion 22mg is a portion of the joint-side male portion 22m that rises radially outward on the joint tightening band portion 12 side.

The joint-side female portion 22 f is provided at the other belt-shaped end of the joint tightening belt portion 12 . The joint-side female portion 22f includes a joint-side female engaging tooth 22ft and a joint-side female grip portion 22fg.
The side of the joint tightening belt portion 12 of the joint side female portion 22f rises radially outward. Furthermore, the radially outer end of the raised portion further rises to the other belt-shaped end of the joint tightening band portion 12 along the circumferential direction. As a result, the joint-side female portion 22f is L-shaped. A joint-side female portion 22f is formed by the L-shaped shape and the belt-like portion located at the other end of the joint tightening band portion 12. As shown in FIG.

The joint-side female portion 22f has a joint-side female engaging tooth 22ft at a portion facing the strip of the joint tightening belt portion 12 at a portion rising in the circumferential direction from the radially outer end of the rising portion. . The joint-side female engaging teeth 22ft engage with the joint-side male engaging teeth 22mt to prevent the joint-side male portion 22m from coming off from the joint-side female portion 22f, thereby maintaining the diameter-reduced state of the joint tightening band portion 12. have a role.
The joint-side female grip portion 22fg refers to a portion of the joint-side female portion 22f that rises radially outward from the joint tightening band portion 12 in particular.

When inserting the joint-side male part 22m into the joint-side female part 22f, an insertion force is applied by simultaneously pinching the joint-side male gripping part 22mg and the joint-side female gripping part 22fg with a tool or hand. Further, when the joint-side male portion 22m is inserted into the joint-side female portion 22f, the distal end of the joint-side female portion 22f abuts against the joint-side male grip portion 22mg. As a result, the joint-side male grip portion 22mg also serves as a stopper that regulates the amount of insertion.
Hereinafter, the tube-side female engaging tooth 21ft, the tube-side male engaging tooth 21mt, the joint-side female engaging tooth 22ft, and the joint-side male engaging tooth 22mt may be collectively referred to as the engaging tooth. Also, the pipe-side protrusion 11p and the joint-side protrusion 12p may be collectively referred to as protrusions.

As shown in FIG. 2, it is preferable that the tube-side engaging portion 21 and the joint-side engaging portion 22 are separated from each other in the radial direction. More specifically, the tube-side male gripping portion 21mg and the tube-side female gripping portion 21fg of the tube-side engaging portion 21, and the joint-side male gripping portion 22mg and the joint-side female gripping portion 22fg of the joint-side engaging portion 22 are They are preferably radially separated from each other. Here, if these portions are located at the same position in the radial direction, when an insertion force is applied to the tube-side engaging portion 21 and the joint-side engaging portion 22 by a tool, hand, or the like, the tube-side engaging portion 21 and the joint will be separated from each other. The side engaging portion 22 may be gripped at the same time. This causes an insufficient insertion amount of the engaging teeth in the tube-side engaging portion 21 or the joint-side engaging portion 22 . As described above, these portions are separated from each other in the radial direction, thereby preventing the above-described problems from occurring and ensuring that the insertion work is performed reliably.

2, the tube-side male gripping portion 21mg and the tube-side female gripping portion 21fg of the tube-side engaging portion 21 and the joint-side male gripping portion 22mg and the tube-side female gripping portion of the joint-side engaging portion 22 are shown. 21fg are preferably located at the same position in the circumferential direction. In other words, it is preferable that these portions are flush with each other when viewed from the axial direction as shown in FIG. As a result, a tool, a hand, or the like can be moved smoothly when applying an insertion force to each of the tube-side engaging portion 21 and the joint-side engaging portion 22 . This ensures an improvement in workability.

The connecting portion 30 connects the pipe tightening strap portion 11 and the joint tightening strap portion 12 . As a result, the clamp 100 integrally holds the resin pipe P and the electric fusion joint F by integrally forming the pipe tightening band portion 11 and the joint tightening band portion 12 in the clamp 100 .
As shown in FIGS. 3 and 4, it is preferable that the connecting portion 30 is provided around half the circumference in the circumferential direction. A gap portion 30s is formed in the remaining half-circumferential portion where the connecting portion 30 is not provided, where the pipe tightening band portion 11 and the joint tightening band portion 12 are not connected.

In addition, it is preferable that the engaging portion 20 is included in a region in which the gap portion 30s is formed in the circumferential direction of the clamp 100 . The fact that the engaging portion 20 is included in the area where the gap portion 30s is formed means that the end portion of the joint tightening band portion 12 and the end portion of the pipe tightening band portion 11 are not connected by the connecting portion 30. , means that the tube-side engaging portion 21 and the joint-side engaging portion 22 are independent of each other.

With such a shape, the engagement of the tube-side engaging portion 21 and the engagement of the joint-side engaging portion 22 can be performed separately. Here, the outer diameters of the resin pipe P and the electric fusion joint F vary within the range of intersection. Moreover, the resin pipe P and the electric fusion joint F are not uniform. Therefore, if the tube-side engaging portion 21 and the joint-side engaging portion 22 are not independent of each other but are integrated, the tightening amount of the tube-side engaging portion 21 and the joint-side engaging portion 22 will be common. Therefore, one of the engaging portions 20 may be insufficiently tightened. Since the tube-side engaging portion 21 and the joint-side engaging portion 22 can be separately engaged, the above-mentioned problems can be avoided, and the engagement work using a tool or the like can be facilitated. can.

The insertion confirmation opening 30 h is a through hole provided between the pipe tightening strap portion 11 and the joint tightening strap portion 12 . The insertion confirmation opening 30h visualizes the connecting portion between the resin pipe P and the electric fusion joint F through the insertion confirmation opening 30h in a state where the resin pipe P is inserted into the electric fusion joint F and the clamp 100 is attached. have a role. This is used to check whether the resin pipe P has come off from the electric fusion joint F.

It is preferable that at least one insertion confirmation opening 30h is provided in the clamp 100 in the circumferential direction. For example, as shown in FIGS. 3 and 4, the insertion confirmation openings 30h are preferably provided at both ends of the connecting portion 30 provided in the circumferential direction, that is, at both ends of the gap portion 30s. With such a shape, in addition to the above role, the insertion confirmation opening 30h also has the role of reducing the stress concentration of the clamp 100 when the tightening strap 10 is moved and reducing the risk of the material breaking. have.

The holding of the resin pipe P and the electric fusion joint F using the electric fusion joint unit composed of the clamp 100 having such a configuration and the electric fusion joint F is performed as follows.
That is, first, as shown in FIG. 9, the clamp 100 is attached to the resin pipe P in advance and arranged at a position sufficiently distant from the insertion margin of the resin pipe P into the electric fusion joint F. As shown in FIG. The resin pipe P is inserted into the electric fusion joint F in this state. Thereafter, as shown in FIG. 10, the clamp 100 is moved along the resin pipe P while aligning the terminal T of the electrofusion joint F with the cutout portion 12h of the joint tightening strap portion 12. As shown in FIG. Then, using a tool such as pliers or the like, the engaging portions 20 are engaged with each other to bring the tube-side protrusion 11p and the joint-side protrusion 12p of the tightening band 10 into contact with the resin pipe P and the electrofusion joint F, respectively. , the resin pipe P and the electric fusion joint F are held.

Here, the electric fusion joint F is usually relatively heavy with respect to the resin pipe P. As shown in FIG. Therefore, when the resin pipe P is inserted into the electric fusion joint F, the electric fusion joint F tends to shift from the central axis of the resin pipe P. As shown in FIG. On the other hand, the axial length of the joint tightening band 12 is longer than the axial length of the pipe tightening band 11 . Therefore, the electric fusion joint F can be reliably fixed. Therefore, the accuracy of centering between the electric fusion joint F and the resin pipe P is enhanced.

Next, a modified example of the clamp 100 according to this embodiment will be described. That is, as shown in FIG. 11, an assembly portion 40 may be provided. In other words, the clamp 100 according to this embodiment may be divided in the circumferential direction at the tightening strap portion 10 . The assembly portion 40 in this case includes a male assembly portion 41 and a female assembly portion 42, as shown in FIGS.
When the clamp 100 is divided in this way, the side provided with the male assembly portion 41 is sometimes referred to as the male side clamp 51 and the side provided with the female side assembly portion 42 is sometimes referred to as the female side clamp 52 .

The male assembling portion 41 and the female assembling portion 42 are shaped to engage with each other, and are engaged by inserting the male assembling portion 41 into the female assembling portion 42 .
It is the same as the engaging portion 20 in that the shapes corresponding to each other are engaged with each other, but the engaging portion 20 is provided with engaging teeth so that the amount of insertion can be adjusted, whereas the assembling portion 40 simply assembles each other. The only difference is that

In this embodiment, as shown in FIG. 12, the male assembly portion 41 is provided on the side of the clamp 100 on which the pipe-side male portion 21m and the joint-side male portion 22m are provided. is provided on the side of the clamp 100 on which the tube-side female portion 21f and the joint-side female portion 22f are provided, but the present invention is not limited to this. That is, the above combinations may be reversed.

The male assembly portion 41 is formed to rise radially outward from the divided end portion of the tightening band portion 10 of the male clamp 51 . The male assembly portion 41 preferably has a quadrangular prism shape that can be inserted into the hole 42h of the female assembly portion 42, for example. In addition to this, the radially outer end of the quadrangular prism may have a claw-like shape that can be hooked on the female assembly portion 42 .

The female assembly portion 42 is formed from the divided ends of the tightening band portion 10 of the female clamp 52 so as to rise outward in the radial direction. is formed so as to rise further toward the side where the is provided. A hole 42 h for receiving the male assembly portion 41 is formed in a portion of the female assembly portion 42 further raised from the base.

The hole 42h penetrates the female assembly portion 42 in the radial direction. By inserting the male assembly portion 41 into the hole 42h, the male assembly portion 41 and the female assembly portion 42 are engaged. In the present embodiment, the hole 42h is preferably formed in a quadrangular prism shape so as to receive the quadrangular prism shape of the male assembly portion 41 . Further, when the male assembly portion 41 has a claw-like shape as described above, the female assembly portion 42 may have a shape corresponding to the claw shape.

In this way, the resin pipe P and the electric fusion joint F using the clamp 100 constituted by the male side clamp 51 having the male side assembly portion 41 and the female side clamp 52 having the female side assembly portion 42 are connected. Retention is performed as follows.
First, as shown in FIG. 16, the male side clamp 51 and the female side clamp 52 are approached from the radially outer side of the resin pipe P in a state in which the resin pipe P is inserted into the electric fusion joint F in advance. At this time, the female side clamp 52 is brought into contact with the resin pipe P and the electric fusion joint F while aligning the terminal T of the electric fusion joint F with the notch portion 12h of the clamp 100 . Next, the male assembly portion 41 of the male clamp 51 is inserted into the female assembly portion 42 of the female clamp 52 . After that, the tightening belt portion 10 of the male side clamp 51 is moved so as to come into contact with the resin pipe P, and the engaging portion 20 is engaged.

When the clamp 100 is engaged with the resin pipe P and the electric fusion joint F by the above process, the state shown in FIG. 17 is obtained. After the assembling portion 40 is engaged in this manner, the assembled state is the same as that of the clamp 100 without the assembling portion 40 .
The clamp 100 having such a configuration is effective, for example, under the following construction conditions. That is, as shown in FIG. 18, when the distance between the elbows E provided at both ends of the resin pipe P is short due to the layout conditions of the construction site, the length of the resin pipe P may have to be shortened. . In this case, the clamp 100 cannot be sufficiently moved on the resin pipe P as shown in FIGS. In such a case, the clamp 100 without the assembling portion 40 needs to be widened so as to open the tightening band portion 10, but the clamp 100 may be damaged.

On the other hand, depending on the clamp 100 having the assembly portion 40, the clamp 100 can be retrofitted with the resin pipe P inserted into the electric fusion joint F in advance. Therefore, it is effective when it is necessary to attach the clamp directly to the electric fusion joint F without moving it on the resin pipe P.

As described above, according to the clamp 100 according to the present embodiment, the joint tightening band portion 12 and the pipe tightening band portion 11 are axially connected by the connecting portion 30 . That is, around the resin pipe P and the electric fusion joint F, the pipe tightening band portion 11 and the joint tightening band portion 12 are integrally provided.
Thus, depending on the shape of the clamp 100, not only the resin pipe P but also the electric fusion joint F can be held at the same time. Therefore, it is possible to prevent deviation and angle from occurring between the resin pipe P and the joint. As a result, it is possible to prevent the resin pipes inserted into the electric fusion joint F from forming an angle. Therefore, it is possible to improve the centering performance between the resin pipes.

Furthermore, since the clamp 100 according to the present invention does not require special materials or the like, it can be constructed at a low cost. For this reason, even if it is mass-produced, there is no impact on cost, so work can be efficiently performed at a plurality of locations.

Further, the tube-side engaging portion 21 and the joint-side engaging portion 22 are independent of each other. As a result, the engaging portion 20 of the pipe tightening band portion 11 and the engaging portion 20 of the joint tightening band portion 12 are independently moved while maintaining the integrity of the pipe tightening band portion 11 and the joint tightening band portion 12. be able to. Therefore, since it is not necessary to reduce the diameters of the pipe tightening band portion 11 and the joint tightening band portion 12 at the same time, the work can be facilitated.

In addition, the circumferential length of the joint tightening band portion 12 is longer than the circumferential length of the pipe tightening band portion 11 . That is, the outer diameter that the joint tightening band 12 can hold is larger than the outer diameter that the pipe tightening band 11 can hold. Therefore, the resin pipe P and the electric fusion joint F having different outer diameters can be held by one clamp 100 .

Further, the axial length of the joint tightening band portion 12 is longer than the axial length of the pipe tightening band portion 11 . Here, the electric fusion joint F is relatively heavy with respect to the resin pipe P. As shown in FIG. On the other hand, since the axial length of the joint tightening band portion 12 is longer than the axial length of the pipe tightening band portion 11, the electric fusion joint F can be more securely held by the joint tightening band portion 12. can.

Further, the pipe-side engaging portion 21 and the joint-side engaging portion 22 are separated from each other in the radial direction of the resin pipe P. Here, if the pipe-side engaging portion 21 and the joint-side engaging portion 22 are located at the same position in the radial direction, the diameter reduction of the pipe tightening band portion 11 and the diameter reduction of the joint tightening band portion 12 are performed by a tool, hand, or the like. may be performed simultaneously by As a result, there is a risk that the diameter reduction described above will not be performed sufficiently. On the other hand, since the pipe-side engaging portion 21 and the joint-side engaging portion 22 are separated from each other in the radial direction, the diameter reduction of the pipe tightening band portion 11 and the diameter reduction of the joint tightening band portion 12 are simultaneously performed. You can avoid being caught. Therefore, it is possible to prevent the above-described problem from occurring.

At least one protruding portion is provided on each of the inner peripheral surfaces of the pipe tightening strap portion 11 and the joint tightening strap portion 12 . In other words, when the tube tightening band 11 and the joint tightening band 12 are contracted in diameter, only the protruding portions come into contact with the resin pipe P and the electric fusion joint F, respectively. Therefore, the tightening force of the tightening band portion 10 is concentrated on the protrusion, so that the holding force of the tightening band portion 10 can be improved.

In addition, the joint tightening band portion 12 is provided with a notch portion 12h corresponding to the shape of the electric fusion joint F. As shown in FIG. Here, in the vicinity of the end of the electric fusion joint F, a power supply terminal or an indicator may be provided. The clamp 100 can be attached without interfering with the electric fusion joint F by providing the notch 12h corresponding to such a shape.

Further, the connecting portion 30 is provided with an insertion confirmation opening 30h. As a result, it is possible to visually confirm the insertion state of the resin pipe P into the electric fusion joint F before the fusion work by the electric fusion joint F is started.

Also, the tightening strap portion 10 is divided in the circumferential direction. Here, if the tightening strap portion 10 is not divided, when aligning the electric fusion joint F, in a state where the clamp 100 is inserted into the resin pipe P, the clamp 100 is inserted along the axial direction of the resin pipe P. It is necessary to move the clamp 100 by At this time, if the length of the resin pipe P is short, the clamp 100 may not be sufficiently moved. On the other hand, since the clamp 100 is divided, the divided tightening belt portion 10 is brought close to the resin pipe P from the outside in the radial direction without moving on the resin pipe P, and then engaged. The joining portion 20 is engaged to assemble the assembling portion 40, and the clamp can be directly attached to the electric fusion joint F.

The technical scope of the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the present invention.
For example, although the tube-side female engaging tooth 21ft and the joint-side female engaging tooth 22ft have been described as being provided on the side facing the tightening belt portion 10 in the L-shape, they face the L-shape. Similar engagement teeth may be provided on the side of the tightening band 10 as well. That is, the tube-side male engaging teeth 21mt and the joint-side male engaging teeth 22mt may have engaging teeth on both sides in the radial direction.
Further, although the insertion confirmation openings 30h are provided at both ends of the connecting portion 30 in the circumferential direction, for example, the insertion confirmation openings 30h are provided so as to provide intermittent portions in the circumferential direction of the connecting portion 30. may
Further, it has been described that the tube-side male gripping portion 21mg and the tube-side female gripping portion 21fg and the joint-side male gripping portion 22mg and the joint-side female gripping portion 22fg are preferably located at the same positions in the circumferential direction. is not limited to For example, the pipe-side engaging portion 21 and the joint-side engaging portion 22 are included in the same quadrant among four quadrants based on the central axis in the axial viewpoint as shown in FIG. The improvement in workability described above may be guaranteed.

In addition, it is possible to appropriately replace the constituent elements in the above-described embodiment with well-known constituent elements without departing from the spirit of the present invention, and the modifications described above may be combined as appropriate.

10 Tightening band 11 Tube tightening band 12 Joint tightening band 12h Notch 20 Engaging portion 21 Tube side engaging portion 22 Joint side engaging portion 30 Connecting portion 30h Insertion check port 40 Assembling portion 100 Clamp F Electrofusion Joint P Resin pipe

Claims (10)

A resin clamp for holding a resin pipe made of thermoplastic resin and an electric fusion joint to which the resin pipe is connected by heat fusion,
In a state in which the resin pipe is arranged inside the electric fusion joint, a band-shaped pipe clamping belt part whose diameter can be reduced to hold the resin pipe, and a diameter reduction to hold the electric fusion joint a tightening band comprising: a possible band-like fitting tightening band;
an engaging portion that maintains a reduced diameter state of the tightening band portion by engaging with each other in a circumferential direction that circulates around the axial direction of the tightening band portion;
with
The engaging portion includes a pipe-side engaging portion provided on the pipe tightening band and a joint-side engaging portion provided on the joint tightening band,
The engaging portion is formed with engaging teeth that can be engaged with each other,
The joint tightening band portion and the pipe tightening band portion are connected in the axial direction by a connecting portion,
clamp. The engaging portion is provided at an end portion in the circumferential direction of the tightening band portion,
The end portion of the joint tightening band portion and the end portion of the pipe tightening band portion are not connected by the connecting portion, and the pipe side engaging portion and the joint side engaging portion are independent of each other. characterized by having
A clamp according to claim 1. The length of the joint tightening band in the circumferential direction is longer than the length of the pipe tightening band in the circumferential direction,
3. A clamp according to claim 1 or 2. The axial length of the joint tightening band is longer than the axial length of the pipe tightening band,
4. A clamp according to any one of claims 1-3. The pipe-side engaging portion and the joint-side engaging portion are separated from each other in the radial direction of the resin pipe,
5. A clamp according to any one of claims 1-4. At least one protrusion is provided on each of the inner peripheral surfaces of the pipe tightening band and the joint tightening band,
6. A clamp according to any one of claims 1-5. The joint tightening band is provided with a notch corresponding to the shape of the electric fusion joint,
7. A clamp according to any one of claims 1-6. The connecting portion is provided with at least one insertion confirmation opening for confirming the insertion state of the resin pipe into the electric fusion joint,
Clamp according to any one of claims 1 to 7. The tightening band portion is divided in the circumferential direction, and an assembly portion for assembling the divided tightening band portions is provided at the divided location,
Clamp according to any one of claims 1 to 8. an electric fusion joint that connects the resin pipes by heat fusion;
a clamp according to any one of claims 1 to 9;
comprising
Electrofusion joint unit.

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