JP3939997B2 - Corrugated tube connection structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
This invention is suitable, for example, for connection in a state in which the pipe ends of corrugated pipes used for a civil protection drainage pipe, cable protective pipes for accommodating and protecting cables such as electric cables and optical fiber cables, are in contact with each other. Concerning connection structure.
[0002]
[Prior art]
In addition to collecting and draining pipes for civil engineering, corrugated pipes made of synthetic resin with helical or annular irregularities formed on the outer periphery are generally used as cable protection pipes that accommodate and protect cables such as electric cables and optical fiber cables. Yes.
[0003]
FIG. 7 shows a conventional connection structure in which the ends of this type of corrugated tube are connected in a butted state. In this connection structure, for example, a waterproof sheet (2) made of, for example, a soft synthetic resin is wound around the corrugated pipes (1) and (1) in a squeeze shape, and the waterproof sheet (2) is placed outside. By attaching the joint member (3) across the end portions of the corrugated pipes (1) and (1), the watertightness is ensured.
[0004]
[Problems to be solved by the invention]
In the conventional connection structure, both ends (4) and (5) along the pipe axis direction of the water-stop sheet (2) are overlapped with each other. As shown in FIG. 8, the sheet end portions (4) and (5) overlapped with each other are bent along the corrugation so as to enter the concave portions (6), (6)... Of the corrugated tubes (1) and (1). As a result, gaps (7), (7),... Are generated between the sheet end portions (4), (5), and as a result, there is a problem that sufficient watertightness cannot be ensured.
[0005]
Accordingly, the present invention solves the above-mentioned problems, prevents the occurrence of gaps between the overlapping ends of the water-stop sheets wound around the corrugated pipe, and can ensure good water tightness. The purpose is to provide a connection structure.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the present invention is a connection structure for connecting ends of corrugated tubes having spiral or annular concavo-convex portions formed on the outer periphery thereof, and the corrugated tubes are arranged to face each other. The water-stop sheets are wound around the edges of the water-stop sheets so as to overlap each other, and the sheet ends along the tube axis direction of the water-stop sheets are overlapped with each other, and between the sheet ends. In the state where a plate-like member made of a hard synthetic resin or the like for preventing the occurrence of a gap in the sheet is interposed between the sheet end portions or between the inner sheet end portion and the corrugated tube outer periphery, The joint member is attached across the end portions of the corrugated tube so as to be pressed from above.
[0007]
Moreover, the plate-shaped member is bonded via an adhesive between the sheet end portions of the water-stop sheet or between the inner sheet end portion and the corrugated tube outer periphery. Further, the plate-like member is formed in a belt shape and arranged along the tube axis direction.
[0008]
Furthermore, an adhesive is applied to almost the entire inner periphery of the water-stop sheet. In addition, the joint member includes a pair of semi-cylindrical joint bodies, and connects the end parts along the pipe axis direction facing each other in a state where these joint bodies are covered from the outside with respect to the waterproof sheet. Become.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an exploded perspective view of a corrugated tube connection structure according to an embodiment of the present invention.
[0010]
In the figure, (10) is a corrugated pipe made of hard synthetic resin used as a drainage pipe for civil engineering of underground type. As shown in FIG. 5, the corrugated tube (10) includes an outer tube (13) in which spiral concavo-convex portions (11) and (12) are formed, and a cylindrical inner tube (14). The inner peripheral surface of the recess (11) of the tube (13) and the outer peripheral surface of the inner tube (14) have a double structure. Therefore, the spiral concavo-convex portions (11) and (12) are continuously formed on the outer periphery of the corrugated tube (10).
[0011]
(20) is a waterproof sheet having flexibility that is wound around the outer periphery of the end portions of the corrugated pipes (10) and (10) that are arranged to face each other and face each other. The water-stop sheet (20) is formed in a band shape by, for example, a soft synthetic resin, and an adhesive (23) made of, for example, butyl rubber is attached to almost the entire inner peripheral side thereof. Further, both end portions (21) and (22) along the tube axis direction of the water-stop sheet (20) are cut obliquely and become tapered.
[0012]
(30) is a plate-like member bonded to the inner peripheral side of the one end (21) along the tube axis direction of the water-stop sheet (20) by an adhesive (23). The plate-like member (30) is formed in a strip shape having a substantially rectangular cross-section with, for example, hard synthetic resin, and is arranged along the tube axis direction. Further, an adhesive (24) made of, for example, butyl rubber is attached to the surface of the plate-like member (30).
[0013]
(40) is attached across the end of the corrugated tube (1) (1) so that the water stop sheet (20) wound around the outer periphery of the end of the corrugated tube (1) (1) is pressed from the outside. For example, it is a joint member made of hard synthetic resin.
[0014]
The joint member (40) includes a pair of semi-cylindrical joint bodies (41) (41). Flange (42) (42) projecting in the direction perpendicular to the pipe axis direction is formed at both ends along the pipe axis direction of each joint body (41), and one of the joint bodies (41) A pair of bolts (43) and (43) are respectively implanted in the flanges (42) and (42), and the flanges (42) and (42) of the other joint body (41) are bolts (43) and (43). Insertion holes (44), (44),.
[0015]
In the figure, (45) and (45) are protrusions formed on the inner peripheral surface of each joint body (41), and the joint body (41) is covered with the corrugated pipes (1) and (1). The corrugated tubes (1) and (1) are fitted into the recesses (11) and (11).
[0016]
Next, a method of connecting the corrugated pipes (10) and (10) using the water-stop sheet (20), the plate-like member (30), and the joint member (40) will be described. First, as shown in FIG. 2, a waterproof sheet (20) is placed on the inner peripheral side of one joint body (41), and this joint body (41) is placed between the pipe ends of the corrugated pipes (10) and (10). And cover the lower side. In this case, the pipe end portion is set so that the butting position is located substantially at the center of the joint body (41).
[0017]
From this state, as shown in FIG. 3, the water-stop sheet (20) is wound around the pipe end periphery of the corrugated pipes (10) and (10) in a squeeze shape, and one end (21) of the water-stop sheet (20). The sheet end portions (21) and (22) are overlapped with each other so as to cover the upper end of the other end portion (22). As shown in FIG. 5, at the end of the corrugated pipe (10) (10) around which the water-stop sheet (20) is wound, the caulking material (49) for water-stop is provided in the recesses (11) and (11). (49) is filled.
[0018]
At the time of winding, since the adhesive (23) is attached to the inner peripheral side of the water-stop sheet (20), the water-stop sheet (20) is a convex portion of the corrugated pipe (10) (10) ( 12) It is in a state of being bonded to (12). Further, since the plate-like member (30) is bonded to the inner peripheral side of the one end portion (21) of the water stop sheet (20), the sheet end portions (21) and (22) are overlapped with each other, A plate-like member (30) is interposed between the sheet end portions (21) and (22). The plate-like member (30) interposed in this way is not only bonded to one end (21) of the water-stop sheet (20) via the adhesive (23), but also to the surface thereof. Since (24) is affixed, it is in a state where it is also adhered to the other end portion (22) of the water-stop sheet (20). Since the sheet end portions (21) and (22) are in a tapered state, even if the plate-like member (30) is interposed between the sheet end portions (21) and (22) overlapped with each other, the portion The wall thickness of the is not to become thick.
[0019]
Subsequently, as shown in FIG. 4, the other joint body (41) is covered between the pipe end portions of the corrugated pipes (10) and (10) from above, and the flange (42 ) (42) extending from the bolts (43) (43) through the insertion holes (44) (44) of the flanges (42) (42) of the other joint body (41). ) (42) ... are superimposed on each other. Then, the nuts (50), (50), are screwed onto the tips of the bolts (43), (43), which have passed through the insertion holes (44), (44), on the other joint body (41) side, and tightened. Thus, the joint main bodies (41) and (41) are connected to each other so as to press the water-stop sheet (20) from the outside. As a result, the tube ends of the corrugated tubes (10) and (10) that are abutted with each other are connected to each other.
[0020]
In this connected state, the corrugated pipe (10) (10) is caused by the influence of the fastening force of the joint member (40), the external pressure, etc. The concave portions (11), (11),... May be bent along the waveform, but even if such an intermediate portion is bent along the waveform, the watertightness is not impaired.
[0021]
On the other hand, the sheet end portions (21) and (22) of the water-stop sheet (20) that overlap each other are bent along the corrugation, and the corrugated pipes (10) and (10) are inserted between the sheet end portions (21) and (22). In some cases, a gap communicating with the recesses (11), (11),... However, as described above, a hard plate member (30) with little deformation is interposed between the sheet end portions (21) and (22), and as shown in FIGS. (22) and the plate-like member (30) are adhered to each other by the adhesive (23) (24), so that the sheet end portions (21) and (22) are the concave portions (11) of the corrugated tubes (10) and (10). ) (11)... Without entering and bending, and generation of a gap between the sheet end portions (21) and (22) can be prevented. That is, while the water-stop sheet (20) wound in a squeeze shape, the sheet end portions (21) and (22) are in close contact with each other via the plate-like member (30), so that no seam is formed. It can be made to function like a cylindrical sheet without any problem, and good water tightness can be ensured.
[0022]
In addition, this invention is not limited to the said embodiment, Of course, many corrections and changes can be added to the said embodiment within the scope of the present invention.
[0023]
For example, the corrugated pipe is not limited to a drainage pipe for civil engineering, but may be, for example, a cable protection pipe that accommodates and protects cables and other various uses.
[0024]
Further, the corrugated tube is not limited to a double-structured tube, but may be a single-structured corrugated tube in which the inner tube is eliminated. Furthermore, the present invention is not limited to the spiral concavo-convex portions formed on the outer periphery, and for example, annular concavo-convex portions may be alternately formed along the tube axis direction.
[0025]
Furthermore, the plate-like member is interposed between the sheet end portions of the water-stop sheets that are overlapped with each other, but may be interposed between the inner sheet end portion and the outer periphery of the corrugated tube.
[0026]
Further, the plate-like member is not limited to a belt-like member having a substantially rectangular cross-sectional shape. For example, the cross-sectional member is formed in a substantially triangular or substantially trapezoidal shape having a tapered surface, and further along the outer periphery of the corrugated tube. It may be curved. By interposing the plate-shaped member having such a shape between the sheet end portions of the water-stopping sheet or between the inner sheet end portion and the outer periphery of the corrugated tube, the sheet end portions are generated by interposing the plate-shaped member. Or the clearance gap between a sheet | seat edge part and a corrugated pipe outer periphery can be restrained small, and the penetration | invasion of the water especially from a pipe-axis direction can be prevented reliably.
[0027]
Furthermore, in the above-described embodiment, the adhesive is applied to almost the entire inner peripheral side of the prevention sheet. However, the adhesive may be applied only to a portion to which the plate-like member is attached.
[0028]
Further, the joint member is not limited to the above-mentioned halved type, but for example, a type in which a water-stop sheet is pressed from the outside by winding a single band-shaped member, and the sieve is divided into three or It may be of a type that presses the water stop sheet from the outside by appropriately combining the members divided further.
[0029]
【The invention's effect】
As apparent from the above description, according to the present invention, between the sheet end portions of the water-stop sheet wound around the end portion outer periphery of the corrugated tube or between the inner sheet end portion and the outer periphery of the corrugated tube, Since a plate-like member made of hard synthetic resin is interposed, it is possible to suppress the bending of the sheet end when the fastening force or external pressure of the joint member is applied, and this creates a gap between the sheet ends. Can be prevented, and good water tightness can be secured. Such an effect is particularly remarkable for a corrugated tube having a wide concave portion.
[0030]
Also, by adhering the sheet end and the plate-like member to each other with an adhesive, the overlapping sheet ends are integrated via the plate-like member, and the generation of gaps between the sheet ends is more reliably prevented. Thus, the water tightness can be further enhanced.
[0031]
Furthermore, by sticking an adhesive to almost the entire inner periphery of the water stop sheet and bonding it to the outer periphery of the end of the corrugated tube, the water stop sheet can be reliably wound around the corrugated tube to further improve water tightness. Can do.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a corrugated tube connection structure according to an embodiment of the present invention.
FIG. 2 is an exploded perspective view showing a state in which one joint body is attached.
FIG. 3 is an exploded perspective view showing a state where the water stop sheet is also wound.
FIG. 4 is a perspective view of the same.
FIG. 5 is a partially broken side view of the same.
6 is a partially enlarged view of FIG. 5;
FIG. 7 is a partially cutaway side view showing a conventional corrugated tube connection structure.
FIG. 8 is a partially enlarged view of FIG. 7;
[Explanation of symbols]
(10) Corrugated tube
(11) Recess
(12) Convex
(20) Waterproof sheet
(21) (22) Seat edge
(23) (24) Adhesive
(30) Plate member
(40) Joint member
(41) Fitting body

Claims (6)

A connection structure for connecting the ends of corrugated tubes having spiral or annular irregularities formed on the outer periphery, and the outer periphery of the ends straddling between the ends of the corrugated tubes arranged to face each other A sheet-like member for winding a water-stop sheet around the sheet and overlapping the sheet end portions along the tube axis direction of the water-stop sheet with each other and preventing the occurrence of a gap between the sheet end portions. In a state of being interposed between the sheet end parts or between the inner sheet end part and the outer periphery of the corrugated pipe, so as to press down the water-stop sheet from the outer side and straddle between the end parts of the corrugated pipe A corrugated tube connection structure characterized in that a member is attached. The corrugated tube connection structure according to claim 1, wherein the plate-like member is formed of a hard synthetic resin. The corrugated tube connection structure according to claim 1 or 2, wherein the plate-like member is bonded via an adhesive between the sheet end portions of the water-stop sheet or between the inner sheet end portion and the corrugated tube outer periphery. The corrugated tube connection structure according to any one of claims 1 to 3, wherein the plate-like member is formed in a band shape and disposed along the tube axis direction. The corrugated tube connection structure according to any one of claims 1 to 4, wherein an adhesive is affixed to substantially the entire inner periphery of the water stop sheet. The joint member includes a pair of semi-cylindrical joint bodies, and the joint bodies are formed by connecting ends facing each other in the tube axis direction in a state where the joint bodies are covered from the outside with respect to the waterproof sheet. Item 6. A corrugated tube connection structure according to any one of Items 1 to 5.

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