JP2023116046A - pipe joint - Google Patents

Abstract

To provide a pipe joint in which the rigidity of a portion with a contact surface is improved to make a function of a projection part more reliable, and which can be constructed even when a diameter of a through hole is out of a predetermined value and small.SOLUTION: A pipe joint 11 has a female threaded part 53 that is screwed into an outer peripheral surface of a spirally corrugated pipe 13, has a contact plate 55 having a contact surface 55a brought into contact with the periphery of a through hole 73 of an underground box 71, and comprises a projection part 52 that is provided on an inner peripheral side with respect to the contact surface 55a and on the outer peripheral side with respect to the female threaded part 53, and enters the through hole 73. The pipe joint connects pipe bodies by sandwiching the periphery of the through hole 73 in cooperation with a bell mouth 12 having a male threaded part 21 screwed into an inner peripheral surface of a pipe body 13 and a contact surface 22a brought into contact with the periphery of the through hole 73. A flange-shaped annular plate part 57 is formed at an end opposite to the projection part 52, and extends in an outer peripheral direction at a distance from the contact plate 55.SELECTED DRAWING: Figure 7

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint used for connecting a tube body for electric wire protection to an underground box, such as a handhole or a manhole, which is buried in the ground.

This type of pipe joint is attached to the outside of the underground box on the outer circumference of the tubular body inserted into the through hole of the underground box. The through hole is formed by drilling in the wall of the underground box, and the pipe joint is formed with a contact surface that abuts around the through hole. The tubular body is connected to the through hole by sandwiching the periphery of the through hole between this abutment surface and a bell mouth attached to the inner side of the wall at the end of the tubular body.

However, earth pressure is applied to the pipe buried in the ground. Depending on how earth pressure is applied, the tubular body protruding vertically from the wall surface of the underground box bends downward at a portion away from the box in the pond. This deformation may create a gap between the pipe joint and the perimeter of the through-hole, making it impossible to maintain water shut-off.

For this reason, the tubular body connection structure disclosed in Patent Document 1 below was devised.

This tubular body connection structure is provided with a cylindrical projection that enters the through hole on the inner peripheral side portion of the abutment surface of the pipe joint that abuts around the through hole. Even if the pipe body bends and the abutment surface of the pipe joint moves away from the perimeter of the through hole, the projection contacts the inner peripheral surface of the through hole and prevents tilting displacement of the pipe joint. It can keep water.

Japanese Patent No. 6071720

However, the portion having the contact surface has a plate-like shape protruding in the outer peripheral direction in the shape of a flange, and the portion opposite to the protrusion is formed in a simple cylindrical shape. This portion should have a high rigidity in order to perform strong tightening and to ensure the action of the protrusions that prevent displacement of the pipe joint.

Also, the through-hole of the underground box may not have the desired size due to the difference in the blades used for drilling. Since the diameter of the protrusion formed on the pipe joint is set to a predetermined value, if the size of the through hole is smaller than the size of the protrusion, the prepared pipe joint cannot be used. end up If such a situation occurs at a construction site, it will lead to serious problems such as a delay in the construction period.

Therefore, the present invention improves the rigidity of the portion having the contact surface to make the function of the projection more reliable, and enables construction even if the diameter of the through hole is outside a predetermined value. The main purpose is to ensure that the benefits of

The means for that purpose has a connecting portion that connects to the outer peripheral surface of the tubular body, and has a contact plate that has a contact surface that contacts the periphery of the through hole to be connected, and is located on the inner peripheral side of the contact surface. A protrusion that penetrates into the through hole is provided at a portion on the outer peripheral side of the connecting portion, and has a connecting portion that connects to the inner peripheral surface of the tubular body, and a contact that abuts around the through hole to be connected. A pipe joint that connects the tubular body to the through hole by sandwiching the periphery of the through hole in cooperation with a bell mouth having a contact surface, wherein the end opposite to the projection has: In the pipe joint, a brim-shaped annular plate portion projecting in the outer peripheral direction at a distance from the contact plate is formed.

In this configuration, when the size of the through hole to be connected is a predetermined size or within an allowable range, the pipe joint is attached to the tubular body by the connecting portion, and the protrusion is inserted into the through hole. In this state, the contact surface of the pipe joint and the contact surface of the bell mouth sandwich the periphery of the through hole. At this time, the annular plate portion is integrated with the contact plate behind the contact plate having the contact surface, and improves the rigidity of the portion closer to the annular plate portion than the contact plate.

In addition, when the through-hole to be connected is smaller than the specified value and the protrusion cannot be inserted, the annular plate can be used by reversing the pipe joint front to back, thereby performing a tightening function instead of the abutment plate. Fulfill.

Further, the annular plate portion is shaped like a flange projecting in the outer peripheral direction. The part can be easily held in cooperation with the abutment plate which is left open.

According to this invention, since the annular plate portion is provided behind the abutment plate, the rigidity of the portion from the abutment plate to the annular plate portion is improved, and the projection inserted into the through-hole to be connected is prevented from moving. function can be ensured.

Moreover, if the through-hole is too small to insert the protrusion, the pipe joint can be reversed and the annular plate portion can be used instead of the abutment plate for connection. Moreover, in this case, since the portion from the annular plate portion to the abutment plate has high rigidity, it is possible to tighten it more firmly, and the waterproofness can be maintained.

In addition, the annular plate projecting in the outer peripheral direction makes it easier to hold than when it is located near the outer peripheral surface of the tubular body, so that the workability of mounting and tightening can be improved.

The perspective view of a pipe joint. Sectional drawing which shows the isolation|separation state of the tubular body connection structure. Sectional drawing of use state. FIG. 4 is a perspective view of the pipe joint with the water stop material separated; The front view, side view, and cross-sectional view of a pipe joint. Sectional drawing which shows a pipe joint and a through-hole. Sectional drawing of use state. A perspective view, a front view, a side view and a cross-sectional view of a pipe joint. A perspective view, a front view, a side view and a cross-sectional view of a pipe joint. A perspective view, a front view, a side view and a cross-sectional view of a pipe joint. A perspective view, a front view, a side view and a cross-sectional view of a pipe joint. A perspective view, a front view, a side view and a cross-sectional view of a pipe joint. A perspective view, a front view, a side view and a cross-sectional view of a pipe joint.

One mode for carrying out the present invention will be described below with reference to the drawings.

FIG. 1 shows a perspective view of the pipe joint 11. As shown in FIG. As shown in FIG. 2, the pipe joint 11 has a pipe connection structure for connecting a spiral wave pipe 13 (hereinafter referred to as "pipe") to an underground box 71 to be connected using a bell mouth 12. is for obtaining

The tubular body 13 is for protecting electric wires buried in the ground, and is made of synthetic resin. Spiral unevenness (spiral wave) is formed not only on the outer peripheral surface but also on the inner peripheral surface. One end of the pipe 13 is fitted into a circular through hole 73 formed in the wall 72 of the underground box 71 . In the connected state, as shown in FIG. 3, the tubular body 13 protrudes vertically from the outer surface 72a of the wall portion 72 of the underground box 71. As shown in FIG.

The pipe joint 11 is made of synthetic resin, is formed in a substantially cylindrical shape as shown in FIG. The cylindrical pipe joint 11 can be divided into two parts in the longitudinal direction (axial direction).

A female threaded portion 53 is formed on the inner peripheral surface of the body portion 51 of the pipe joint 11 as a coupling portion that is coupled to the outer peripheral surface of the tubular body 13 by screwing. The female threaded portion 53 is provided with a sheet-shaped water stop material 54 that expands when it absorbs moisture.

As the water stop material 54, a non-woven fabric made of polyethylene terephthalate or the like holding a water-swelling material that absorbs water and expands can be used. As shown in FIG. 4, the fixing to the female threaded portion 53 is preferably performed by attaching the water stop material 54 cut into the required shape, but the water stop material 54 may be integrally formed when the pipe joint 11 is formed. can.

FIG. 5 shows a side view, a front view, and a cross-sectional view of the pipe joint 11 in which illustration of all the water stop materials including the water stop material 54 is omitted. In FIG. 5, (a) is a left side view, (b) is a front view, (c) is a right side view, and (d) is a cross-sectional view along AA in (c). (d) shows a cross-sectional shape at the BB cut position.

At the end of the outer peripheral surface of the main body 51 that is connected to the underground box 71, that is, at the end on the protruding portion 52 side, an abutment plate 55 that protrudes in the outer peripheral direction and has a larger diameter than the through hole 73 is formed. It is Here, "the side connected to the underground box 71" indicates the directionality in the intended usage mode, and does not have an absolute meaning.

The contact plate 55 has an annular shape with a circular contour. The flat surface of the contact plate 55 on the protruding portion 52 side is the contact surface 55a that contacts the circumference of the through hole 73 in the outer surface 72a of the underground box 71 . A water stop material 56 is also provided on the contact surface 55a. Therefore, the contact surface 55a indirectly contacts the underground box 71 through the water stop material 56. As shown in FIG.

The water stop material 56 provided on the contact surface 55a is formed in an annular shape. The structure of the water stop material 56 may be made of only water-swellable nonwoven fabric as described above. 4, a two-layer structure having a rubber layer 56b on the back of a water-swellable nonwoven fabric layer 56a is preferable. By forming the rubber layer 56b from a soft rubber and laminating the non-woven fabric layer 56a, when the water-swellable non-woven fabric layer 56a swells and exerts a tightening force, the rubber layer 56b is compressed and deformed while providing a repulsive force. can act. As a result, firm tightening becomes possible and a better water stopping condition is obtained.

A brim-shaped annular plate portion 57 is formed at the end of the outer peripheral surface of the body portion 51 opposite to the side connected to the underground box 71 and protrudes in the outer peripheral direction at a distance from the contact plate 55 . Here, the meaning of "the side connected to the underground box 71" also indicates the directionality in the originally planned usage mode, and is not an absolute meaning.

The length in the axial direction of the body portion 51 having the annular plate portion 57 and the contact plate portion 55 is at least the length necessary to form the female thread portion 53, and the contact plate portion 55 and the annular plate portion 57 are It is set to a length that stabilizes your fingertips or hands when they are caught in the

The shape of the annular plate portion 57 is the same as that of the contact plate 55, and is an annular shape with a circular outline. Also, the size of the annular plate portion 57 is a size corresponding to the size of the contact plate 55 . That is, the annular plate portion 57 has a size that is balanced with the contact plate 55, and is formed to have the same size or a similar size. Even if the contour shapes of the annular plate portion 57 and the contact plate 55 are different, if part of the diameter is the same or similar, they can have similar sizes.

In this example, the annular plate portion 57 is formed to have the same size and shape as the contact plate 55 and is arranged parallel to the contact plate 55 .

A rib 58 is formed between the annular plate portion 57 and the contact plate 55 to connect them. The ribs 58 extend parallel to the axial direction of the main body portion 51, and are arranged in plurality at regular intervals along the circumferential direction. The number of ribs 58 in this example is four. The height of the rib 58 is a height that sufficiently supports the annular plate portion 57 and the contact plate 55, and more preferably, the finger or hand touches the outer periphery of the main body portion 51. It should be set to height.

A flat surface of the annular plate portion 57 opposite to the contact surface 55a of the contact plate 55 is a contact surface 57a for reversal use. is provided. The water stop material 59 preferably has the same structure as the water stop material 56 provided on the contact surface 55 a of the contact plate 55 . That is, the water stop material 59 should preferably have a two-layer structure in which a rubber layer 59b is provided on the rear surface of a water-swellable nonwoven fabric layer 59a.

The protrusion 52 is integrally formed at the end of the main body 51 having the contact plate 55 and on the inner peripheral side of the contact surface 55 a and the outer peripheral side of the female screw portion 53 . This protrusion 52 is cylindrical and is a portion that enters the through hole 73 .

As shown in FIG. 6, the size of the outer peripheral surface of the protrusion 52, that is, the outer diameter D1 is set to be slightly smaller than the desired diameter D2 of the through hole 73 by several millimeters.

The female threaded portion 53 described above is not formed on the projecting portion 52 , and the range where the female threaded portion 53 is formed is only the range corresponding to the portion between the contact plate 55 and the annular plate portion 57 . The inner peripheral surface of the protruding portion 52 has a smooth circumferential surface without irregularities.

The length L1 of the protruding portion 52 is preferably set to be equal to or less than the thickness L2 of the wall portion 72 of the underground box 71, although the longer one is desirable in the intended usage mode. The "length L1 of the protrusion 52" referred to here is the length obtained by subtracting the thickness t of the water stop material 56 from the original length L3 of the protrusion 52 because the contact surface 55a is provided with the water stop material 56. It is.

The underground box 71 in the illustrated example has a wall portion 72 that is thinner than usual, that is, about 30 mm.

The thickness of the protrusion 52 has a desired rigidity, and the thickness of the protrusion 52 is between the outer peripheral surface of the tubular body 13 to be connected regardless of the inner peripheral surface of the main body 51 (the radial position of the thread root of the female thread portion 53). It is the thickness that creates the gap.

The bell mouth 12 is made of synthetic resin and has a cylindrical male threaded portion 21 as a coupling portion that is screwed to the inner peripheral surface of the tubular body 13. At one end of the male threaded portion 21, a brim-like member is provided in the outer peripheral direction. It has an annular contact plate 22 that protrudes outward and is larger than the through hole 73 . The surface of the abutment plate 22 on the side having the male screw portion 21 is the abutment surface 22a that indirectly abuts the circumference of the through hole 73 in the inner surface 72b of the underground box 71 . The contact surface 22a is also provided with the water stop material 23. As shown in FIG.

The pipe body 13 is connected to the wall portion 72 of the underground box 71 using the pipe joint 11 as described above, as follows.

First, one end of the pipe body 13 is screwed into the pipe joint 11, and the projecting portion 52 of the pipe joint 11 is inserted into the through hole 73 formed in the wall portion 72 of the underground box 71 from the outer surface 72a side. do.

Next, the male screw portion 21 of the bell mouth 12 is screwed into the inner peripheral surface of the tubular body 13 from the inner surface 72b of the wall portion 72 of the underground box 71, and the contact surfaces 55a and 22a of the pipe joint 11 and the bell mouth 12 are screwed together. , the periphery of the through hole 73 in the wall portion 72 is sandwiched in the thickness direction. In this way, the pipe joint 11 and the bell mouth 12 cooperate to connect the pipe body 13 into the through hole 73, and as shown in FIG. becomes. At this time, the outer peripheral surface of the projecting portion 52 of the pipe joint 11 is brought close to the inner peripheral surface of the through hole 73 via a thin gap.

The body portion 51 of the pipe joint 11 has a horizontal U-shaped cross section with flanges at both ends of the cylindrical portion, so that it has high rigidity and is easy to hold by hand. Moreover, since the outer diameter of the annular plate portion 57 is larger than the inner diameter of the contact plate 55, the holding hand can be separated from the tubular body 13, the rotation is easy, and force can be applied efficiently. Therefore, the workability of screwing the pipe joint 11 is good, and the work of clamping the wall portion 72 of the underground box 71 by tightening can be performed well.

When buried in the ground after connection, all the water-stopping materials 54, 56, 59 absorb moisture in the ground and swell, leaving the parts of the water-stopping materials 54, 56, 59 without gaps. At the same time, the bonding state of each member 11, 12, 13 is strengthened. The projecting portion 52 of the pipe joint 11 is held in a state of being inserted into the through hole 73 so as not to be relatively displaceable.

In this state, even if earth pressure is applied and a load is applied to the pipe body 13 so as to press it down from above, and the pipe body 13 is flexurally deformed, the protrusion 52 of the pipe joint 11 is in contact with the inner peripheral surface of the through hole 73 . relative displacement is prevented by holding or approximating contact. This action is supplemented by the expansive force of the water stop materials 56, 23 provided on the contact surfaces 55a, 22a.

In this manner, the protrusion 52 prevents the pipe joint 11 from being displaced in the through hole 73, and the rigidity of the body portion 51 having the contact plate 55 and the annular plate portion 57 is high. Therefore, even if a downward bending load is applied to the pipe body 13, the contact surface 55a of the pipe joint 11 is not greatly displaced away from the periphery of the through-hole 73, and the water cutoff property can be maintained.

Since the rib 58 is provided between the contact plate 55 and the annular plate portion 57, the rigidity of the main body portion 51 is increased, and the sandwiching can be performed strongly, so that the above effect can be realized more reliably.

In addition, since the connecting portion between the pipe joint 11 and the bell mouth 12 is formed by a screw, the connection can be performed by rotation, and the connecting work is very easy. In addition, since the annular plate portion 57 is formed in an annular shape and has a size corresponding to the size of the contact plate 55, holding and rotating the main body portion 51 with a fingertip or hand and rotating force can be efficiently applied. can be easily given to In addition, since the ribs 58 also play a role of anti-slip during rotation, workability is good.

If the size of the through-hole 73 of the underground box 71 is smaller than the expected size and the protrusion 52 cannot be inserted, the abutting surface 57a during reversal use is placed in the underground box 71 as shown in FIG. are pressed against the outer surface 72a of the . That is, the pipe joint 11 is used by reversing the direction opposite to that in the example of FIG. 3 described above.

When used in this manner, the functions of the annular plate portion 57 and the contact plate 55 are interchanged, but the functions are the same. However, since the protrusion 52 does not enter the through hole 73 , it is exposed to the outside of the underground box 71 .

However, since the rigidity of the main body portion 51 is high as described above, a strong fixed state can be obtained, and a good water stopping state can be maintained. The screwing workability of the pipe joint 11 is also good as described above.

In addition, even if the tubular body 13 is bent downward due to earth pressure, the inner peripheral surface of the protrusion 52 is smooth without irregularities, and there is no gap between the outer peripheral surface of the tubular body 13 and the inner peripheral surface of the protrusion 52. Therefore, strong pressure due to deformation of the tubular body 13 can be suppressed. Therefore, when the annular plate portion 57 is reversed, the abutment surface 57a can be prevented from being displaced from the outer side surface 72a of the underground box 71 to form a large gap, thereby maintaining the waterproof property.

In particular, when the length of the projecting portion 52 is set short so as to be able to connect to an underground box 71 having a thinner wall portion 72 than usual, such as the pipe joint 11 in the illustrated example, the pipe body 13 less susceptible to deformation.

A plurality of types of pipe joints 11 configured as described above are prepared according to the thickness of the pipe body 13 to be connected. There are differences in dimensions.

An example of the pipe joint 11 having different dimensions according to the thickness will be described below with reference to FIGS. 8 to 13. FIG. In this description, the same reference numerals are assigned to the same parts as those of the configuration described above, and detailed description thereof will be omitted.

8 to 13 show the appearance and cross section of the pipe joint 11 with all the water stop materials 54, 56 and 59 omitted, and are shown in the same format in all the figures. In the figures, (a) is a perspective view, (b) is a left side view, (c) is a front view, (d) is a right side view, and (e) is a right side view center vertical sectional view. The dashed line in (a) indicates the cross-sectional shape at the position indicated by the dashed-dotted line, which is the position of the female screw portion 53 in (e).

Further, the length of the projection 52 in all the drawings is the same as the thickness of the wall portion 72 to be connected is the same as that of the aforementioned pipe joint 11 shown in FIG. are of the same length.

FIG. 8 shows a pipe joint 11 having a diameter smaller than that of the pipe joint 11 of FIG. 5, and FIGS. showing.

As shown in these figures, as the diameter increases, the length of the body portion 51 increases stepwise, and the ratio of the length to the length of the protrusion 52 increases stepwise. Since the length of the projection 52 is the same in any pipe joint 11, the projection 52 becomes longer and thinner as the diameter becomes smaller, and becomes thicker and shorter as the diameter becomes larger.

The thickness of the waterproof material provided for the pipe joints 11 having different sizes is the same.

The above configuration is one configuration for carrying out the present invention, and the present invention is not limited to the configuration described above, and other configurations can be employed.

For example, the tubular body 13 may be of the independent crest type as well as a helical wave tube.

DESCRIPTION OF SYMBOLS 11... Pipe joint 12... Bell mouth 13... Spiral wave pipe 21... Male screw part 22a... Contact surface 52... Protrusion 53... Female screw part 55... Contact plate 55a... Contact surface 57... Annular plate part 57a... Reverse use Time contact surface 58 Rib 59 Water stop material 71 Underground box 73 Through hole

Claims (6)

It has a connecting part that connects to the outer peripheral surface of the tubular body, and has a contact plate that has a contact surface that contacts around the through hole to be connected, and is located on the inner peripheral side of the contact surface and from the connecting part. has a protrusion that penetrates into the through-hole at a portion on the outer peripheral side, has a connecting portion that joins to the inner peripheral surface of the tubular body, and has a contact surface that contacts the periphery of the through-hole to be connected A pipe joint that connects the tubular body to the through hole by sandwiching the periphery of the through hole in cooperation with a bell mouth having
A pipe joint in which a brim-shaped annular plate portion projecting in the outer peripheral direction at a distance from the contact plate is formed at the end opposite to the protrusion. 2. The pipe joint according to claim 1, wherein the annular plate portion is formed in an annular shape with a circular contour. 3. The pipe joint according to claim 1, wherein said annular plate portion is formed to have a size corresponding to the size of said contact plate. The pipe joint according to any one of claims 1 to 3, wherein a rib is formed between the annular plate portion and the contact plate to connect them. 5. The pipe joint according to any one of claims 1 to 4, wherein the coupling portion is formed only in a range corresponding to a portion between the contact plate and the annular plate portion. The pipe joint according to any one of claims 1 to 5, wherein a surface of the annular plate portion opposite to the contact surface is provided with a water stop material.

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