GB2043195A

GB2043195A - A tensile stress resistant connection between a first corrugated pipe part with transverse grooves and a second pipe part

Info

Publication number: GB2043195A
Application number: GB7935816A
Authority: GB
Original assignee: Wavin BV
Current assignee: Wavin BV
Priority date: 1978-10-19
Filing date: 1979-10-16
Publication date: 1980-10-01
Also published as: DK441879A; NL7810478A; GB2043195B; SE7908631L

Abstract

The invention relates to a tensile stress resistant connection between a corrugated shaft 2 in the form of a pipe part with transverse grooves 4 and a second pipe part 7 integral with a cover 6. The pipe part 7 is provided with one or more cams 8 and at at least the upper crest of the corrugation with a recess 9 for allowing passage of the cams. Preferably two opposite cams 8 are present. A crest is provided with two recesses 9 opposite to each other. A sealing ring 10 is accommodated in a groove 4b of the corrugated shaft 2. <IMAGE>

Description

SPECIFICATION A tensile stress resistant connection between a first corrugated pipe part with transverse grooves and a second pipe part.

The invention relates to a connection comprising a first corrugated pipe part with transverse grooves and a second pipe part being provided with at least one, inwardly protruding cam, cooperating with a transverse groove of the first pipe part.

A connection of this type between a first corrugated pipe part with transverse grooves and a second pipe part in the form of a coupling part, is known. In this known connection the second pipe part in the form of a pipe coupling part, is provided with inwardly directed cams, the transverse grooves and/or cams being deformable so that the transverse grooves may pass said cams, resulting in a tensile stress resistant connection.

Said known connection is inconvenient since either the transverse grooves or the cams have to be rather flexible in order to have the protruding cams of the coupling pipe part pass properly.

It has appeared that a connection of this type is particularly inconvenient when the shaft of a gulley, more particular an inspection gulley, in the form of a relatively thick-walled pipe part comprising transverse grooves, has to be provided with a cover, the more so as said cover has to be regularly removed from said shaft comprising transverse grooves.

The known pipe coupling parts as used for subground pipelines have seldom to be removed from the pipe parts with transverse grooves. This is not the case, however, in a gulley, since gulleys, in particular inspection gulleys, should be regularly accessible.

The present invention aims to provide a connection of the abovementioned type wherein the aforedescribed disadvantages are obviated.

This is attained in accordance with the invention in that at least the first transverse groove of the first pipe is provided with a recess for the passage of said cam.

In this manner it is achieved that relatively thickwalled second pipe parts can be employed, which are especially required when said second pipe parts are used as covers for gulleys.

Due to the presence of the recess, the passage of said cams does not require a deformation of said cams, while on the other hand the second pipe part may be easily connected in a tensile stress resistant manner by rotation of the second pipe part with respect to the first pipe part, as the cam then adjoins the wall of a corrugation of the first pipe part with transverse grooves.

The first pipe part appropriately comprises at least two cams, preferably symmetrically opposite each other, whilst there are at least two recesses which may be positioned opposite said cams.

This result in a very effective connection of the second pipe part with respect to the first pipe part, as the two cams will contribute to obtaining a tensile stress resistant connection and an even division of the exerted forces.

A plurality of superposed transverse grooves are efficiently provided with a recess, thus enabling an adjustment of the position of the second pipe part with respect to the first pipe part with transverse grooves. This offers the possibility of positioning the second pipe part at the desired level with respect to the first pipe part with transverse grooves, if, for instance, a road surface has to be elevated.

In order to avoid sagging of the second pipe part after mounting same onto the first pipe part, which may occur particularly when the second pipe part is rather heavy, such as is for example the case when said second pipe part is used as a cover for a gulley or an inspection gulley, it is recommended to provide the plurality of superposed transverse grooves with recesses which are in a staggered position with respect to each other.

A sealing ring is preferably located in a transverse groove of the first pipe part which sealing ring cooperates sealingly with the outer side of the first pipe part and the inner side of the second pipe part.

The first pipe part with transverse grooves is preferably the shaft of a gulley, more particularly an inspection gulley, the second pipe part being preferably a pipe part connected with a cover of a gulley or an inspection gulley.

The invention will be illustrated by means of an embodiment as shown in the drawing, wherein: Figure 1 is a tensile stress resistant connection between a first and a second pipe part; Figure 2 is a cross sectional view according to line Il-Il.

Figure 1 shows a plastics inspection gulley 1, provided with a shaft 2 in the form of a pipe part with transverse grooves 4. A crest 5 is located between two adjacent transverse grooves 4.

A cover 6, being integral with a second pipe part 7, is used for closing off such an inspection gulley. This second pipe part 7 is provided with inwardly directed cams 8, preferably with two cams 8, being symmetrically opposite each other.

Each crest 5 is provided with two recesses 9, also located symmetrically opposite each other through which recesses 9 the cams 8 can pass. The cams 8 will then be located between two successive crests 5 of such a corrugated pipe.

By rotating the cover 6 with the second pipe part 7, the cams 8 are moved away from the recesses 9, thus ensuring a tensile stress resistant connection.

Should the second pipe part with the cams 8 be moved downwardly over a larger distance, then the pipe is further rotated until the cams 8 will come to lie opposite the recesses 9a.

Subsequently the cam 8 will be engaged in groove 4a; this may be repeated until the desired upper level of the cover 6 is obtained.

The groove 4b comprises a sealing ring 10, ensuring a sealing between the inner side of pipe part 7 and the outer side of the pipe part 2 with transverse grooves.

1. A tensile stress resistant connection comprising a first corrugated pipe part with transverse

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION A tensile stress resistant connection between a first corrugated pipe part with transverse grooves and a second pipe part. The invention relates to a connection comprising a first corrugated pipe part with transverse grooves and a second pipe part being provided with at least one, inwardly protruding cam, cooperating with a transverse groove of the first pipe part. A connection of this type between a first corrugated pipe part with transverse grooves and a second pipe part in the form of a coupling part, is known. In this known connection the second pipe part in the form of a pipe coupling part, is provided with inwardly directed cams, the transverse grooves and/or cams being deformable so that the transverse grooves may pass said cams, resulting in a tensile stress resistant connection. Said known connection is inconvenient since either the transverse grooves or the cams have to be rather flexible in order to have the protruding cams of the coupling pipe part pass properly. It has appeared that a connection of this type is particularly inconvenient when the shaft of a gulley, more particular an inspection gulley, in the form of a relatively thick-walled pipe part comprising transverse grooves, has to be provided with a cover, the more so as said cover has to be regularly removed from said shaft comprising transverse grooves. The known pipe coupling parts as used for subground pipelines have seldom to be removed from the pipe parts with transverse grooves. This is not the case, however, in a gulley, since gulleys, in particular inspection gulleys, should be regularly accessible. The present invention aims to provide a connection of the abovementioned type wherein the aforedescribed disadvantages are obviated. This is attained in accordance with the invention in that at least the first transverse groove of the first pipe is provided with a recess for the passage of said cam. In this manner it is achieved that relatively thickwalled second pipe parts can be employed, which are especially required when said second pipe parts are used as covers for gulleys. Due to the presence of the recess, the passage of said cams does not require a deformation of said cams, while on the other hand the second pipe part may be easily connected in a tensile stress resistant manner by rotation of the second pipe part with respect to the first pipe part, as the cam then adjoins the wall of a corrugation of the first pipe part with transverse grooves. The first pipe part appropriately comprises at least two cams, preferably symmetrically opposite each other, whilst there are at least two recesses which may be positioned opposite said cams. This result in a very effective connection of the second pipe part with respect to the first pipe part, as the two cams will contribute to obtaining a tensile stress resistant connection and an even division of the exerted forces. A plurality of superposed transverse grooves are efficiently provided with a recess, thus enabling an adjustment of the position of the second pipe part with respect to the first pipe part with transverse grooves. This offers the possibility of positioning the second pipe part at the desired level with respect to the first pipe part with transverse grooves, if, for instance, a road surface has to be elevated. In order to avoid sagging of the second pipe part after mounting same onto the first pipe part, which may occur particularly when the second pipe part is rather heavy, such as is for example the case when said second pipe part is used as a cover for a gulley or an inspection gulley, it is recommended to provide the plurality of superposed transverse grooves with recesses which are in a staggered position with respect to each other. A sealing ring is preferably located in a transverse groove of the first pipe part which sealing ring cooperates sealingly with the outer side of the first pipe part and the inner side of the second pipe part. The first pipe part with transverse grooves is preferably the shaft of a gulley, more particularly an inspection gulley, the second pipe part being preferably a pipe part connected with a cover of a gulley or an inspection gulley. The invention will be illustrated by means of an embodiment as shown in the drawing, wherein: Figure 1 is a tensile stress resistant connection between a first and a second pipe part; Figure 2 is a cross sectional view according to line Il-Il. Figure 1 shows a plastics inspection gulley 1, provided with a shaft 2 in the form of a pipe part with transverse grooves 4. A crest 5 is located between two adjacent transverse grooves 4. A cover 6, being integral with a second pipe part 7, is used for closing off such an inspection gulley. This second pipe part 7 is provided with inwardly directed cams 8, preferably with two cams 8, being symmetrically opposite each other. Each crest 5 is provided with two recesses 9, also located symmetrically opposite each other through which recesses 9 the cams 8 can pass. The cams 8 will then be located between two successive crests 5 of such a corrugated pipe. By rotating the cover 6 with the second pipe part 7, the cams 8 are moved away from the recesses 9, thus ensuring a tensile stress resistant connection. Should the second pipe part with the cams 8 be moved downwardly over a larger distance, then the pipe is further rotated until the cams 8 will come to lie opposite the recesses 9a. Subsequently the cam 8 will be engaged in groove 4a; this may be repeated until the desired upper level of the cover 6 is obtained. The groove 4b comprises a sealing ring 10, ensuring a sealing between the inner side of pipe part 7 and the outer side of the pipe part 2 with transverse grooves. CLAIMS

1. A tensile stress resistant connection comprising a first corrugated pipe part with transverse grooves and a second pipe part being provided with at least one inwardly protruding cam, cooperating with a transverse groove of the first pipe part characterized in that at least the first transverse groove of the first pipe part is provided with a recess for the passage of said cam.

2. A tensile stress resistant connection according to claim 1, characterized in that at least two cams, preferably located symmetrically opposite each other, and at least two recesses are provided, which may be positioned opposite said cams.

3. A tensile stress resistant connection according to claim 1 or 2, characterized in that a plurality of superposed transverse grooves are provided with a recess.

4. Atensile stress resistant connection according to any or more of the preceding claims, characterized in that the recesses in the plurality of superposed grooves are staggered with respect to one another.

5. A tensile stress resistant connection according to any or more of the preceding claims, characterized in that a transverse groove comprises a sealing ring cooperating sealingly with the outer side of the first pipe part and the inner side of the second pipe part.

6. Atensilestress resistant connection according to any or more of the preceding claims, characterized in that the first pipe part with transverse grooves is a shaft of a gulley, particularly of an inspection gulley.

7. A tensile stress resistant connection as claimed in any or more ofthe preceding claims, characterized in that the second pipe part is a pipe part connected with a cover of a gulley, particularly an inspection gulley.