An arrangement with a drainage receptacle and a method of casting such a receptacle or a bottom section for same

Abstract

 In an arrangement, in which a gutter receptacle (3) is connected to drainage collection conduit (14,15) through a siphon trap (5,9), the new feature is that the part (9) of the siphon trap lying outside the bottom section (5) of the receptacle (3) is a part of a doubly-curved pipe (9,10), the downstream end (11) of which is connected to the collecting pipes through a sliding muff (12).
The opening (7) is preferably cast by using a core or core ring (not shown) of a material with low mechanical strength, such as hard cellular plastic, which remains in the opening until the pipe (9,10) is to be installed. This provides in part for an accurate casting of the opening (7), in part a protection of this opening during transport and handling between the casting operation and the installation work.

Description

[0001] The present invention relates to an arrangement with a drainage receptacle, said arrangement being of the kind set forth in detail in the preamble of claim 1.

[0002] In previously known arrangements of the kind mentioned above, the siphon trap is usually formed as a part of the lower portion or bottom section of the drainage receptacle, which for this purpose is shaped with an upwardly directed "spout", to which the downstream portions of the arrangement may be connected.

[0003] These known arrangements do, however, suffer from a number of disadvantages; thus the "spout" mentioned makes the drainage receptacle or its bottom section asymmetrical with regard to weight, making it difficult to handle, especially when it is to be correctly oriented in its final operating position. Further, the "spout" is very vulnerable, as it may easily be damaged during transport and handling. Still further, the installation work with establishing the connection to the more downstream parts of the arrangements is troublesome, as it is necessary to form a connection between the "spout" being directed upwardly at an angle and a connecting pipe extending generally horizontally to a main drain pipe.

[0004] It is on this background the object of the present invention to provide an arrangement of the kind referred to initially, which does not suffer from the disadvantages described above, and makes it possible in a simple and effective manner to establish the connection between the drainage receptacle and those pipes or conduits, to which it is to be connected, and this object is achieved with an arrangement, according to the present invention also exhibiting the features set forth in the characterizing clause of claim 1.

[0005] With this arrangement, that part of the siphon trap, which was previously constituted by the "spout", is now constituted by a curved pipe section, which is not placed in its final operating position until the drainage receptacle proper or at least its bottom section has been placed in the final operating position.

[0006] With the embodiment set forth in claim 2 is achieved that the pipe used for estabilishing the connection has the correct orientation at both ends, and with the further development hereof set forth in claim 3 it is also achieved that the connecting pipe to begin with may be made slightly shorter in order to make it possible to bring it into position between the drainage receptacle and the upstream end of that drain pipe, with which the receptacle is to be connected, after which the pipe is made longer and connected in a liquid-tight manner with its two ends to the receptacle and the drain pipe, respectively.

[0007] In drainage arrangements of the kind initially mentioned it is known to use a flushing conduit to clean that part of the siphon trap lying outside the receptacle proper or its bottom section, and claim 4 indicates an advantageous embodiment of the arrange­ ment according to the present invention, in which this principle is utilized.

[0008] The present invention also relates to a method of casting a drainage receptacle or a bottom section for such a receptacle for use in an arrangement according to the present invention, and according to the present invention this method also comprises the steps set forth in the characterizing clause of claim 5. This makes it possible, partly to give the opening a very accurate shape, since it is relatively easy to precision-mould casting cores of material of the kind here referred to, partly that the casting core may be utilized for protecting the opening against damage during transportation and handling, as it may remain in the opening until the pipe, with which the drainage receptacle is to be connected to drain pipes, is to be installed.

[0009] The embodiment set forth in claim 6 provides for an easy control or guidance of the casting core, as it may be placed on a round guide block or the like in the casting mould, preferably on the outer part thereof.

[0010] The embodiment set forth in claim 7 makes it possible to cast the opening with ridges and/or grooves with a view to adapting the opening to packing rings, gaskets and the like.

[0011] In the following, the invention will be explained in more details with reference to the exemplary embodi­ment of an arrangement according to the invention shown on the drawing, in which

Figure 1 is a vertical sectional view through the arrangement,

Figure 2 is a magnified cut-out corresponding to the circle II in Figure 1,

Figure 3 shows a bottom section for a drainage receptacle in an arrangement according to present invention, viewed from above, and

Figures 4 a-c show the bottom section shown in Figure 3 in sectional view along the line IV-IV in Figure 3 in three successive stages of installation.

[0012] The exemplary embodiment of a gutter drainage arrangement according to the present invention shown in Figure 1 is adapted to drain off surface water from a road surface 1, the latter being bounded by a kerbstone 2 on the side lying to the left in Figure 1. In the gutter formed along the kerbstone 2 a gutter receptacle 3 is situated, upwardly covered in the usually manner by a grate 4. The gutter receptacle 3 is in a known manner composed of a number of sections, of which the bottom section 5 differs from previously known bottom sections from such receptacles by having in its side wall 6 a circular opening 7, in which the generally horizontally extending end 8 of a curved pipe section 9, which extends outwardly and upwardly from the opening 7, is inserted in a liquid-tight manner, instead of the previously known siphon trap constituting an integral part of the side wall 6.

[0013] I continuation of the pipe section 9 another pipe section 10 extends with opposite curvature, having its downstream end 11 movably inserted in an elongated muff or sliding muff 12.

[0014] The sliding muff 12 constitutes the muff portion of a short pipe 13, the opposite end of which is inserted in a liquid-tight manner in the muff end on the most upstream one of a number of concrete pipes 14, the downstream end of which opens into a main drainpipe 15.

[0015] When water flows down through the grate 4, it will collect in the lower part of the bottom section 5 and the first curved pipe section 9, until it reaches the overflow level 16. In this manner, a siphon trap is formed between the concrete pipes 14 and the upper part of the gutter receptacle 3, said trap in a known manner and with a known effect forming a barrier between the drain system comprising the main drain­pipe 15 and the surroundings. Further water flowing in will, of course, flow from the first curved pipe section 9 through the second curved pipe section 10 and from there out to the main drainpipe 15.

[0016] Figure 2 shows some of the details in the short pipe 13 and the parts cooperating therewith. Thus, the downstream end 11 on the second curved pipe section 10 is sealed against the sliding muff 12 by means of an O-ring 17, while the downstream end on the short pipe 13 in a known manner is sealed in relation to the muff in the nearest concrete pipe 14 by means of a suitable gasket 18, the latter being of any kind able to fulfil this function.

[0017] With reference to Figures 3 and 4 it will now be explained, partly how the opening 7 in the bottom section 5 according to the present invention may be formed in an extremely advantageous manner, partly how the pipe 9,10 with opposite curvatures is inserted in a liquid-tight manner in the opening. Figure 3 and especially Figure 4a show a core ring 19 which is used for forming the opening 7 during the preceding moulding or casting of the bottom section 5 from e.g. concrete. Before the moulding or casting takes place, the core ring 19 is placed on a round guide block which fits into the ring 19 and is secured to the outer part of the mould. After the moulding or casting the mould parts are removed in such a manner, that the core ring 19 remains in the opening 7 in the side wall 6.

[0018] The material used for the core ring 19 is preferably a hard cellular plastic material, which on the one hand is sufficiently rigid to withstand both the casting or moulding stresses and stresses occuring during the subsequent transport and handling of the bottom section 5, so that the sides in the opening 7 are protected. On the other hand, the material in the core ring 19 is not harder than that the ring may be crushed and removed without much effort, e.g. by carefully using a hammer and/or a scraper or the like. Thus, the bottom section 5 will arrive at the installation site in the condition shown in Figure 4a, but the core ring 19 is removed prior to the insertion of the pipe 9,10, so that the bottom section 5 appears as shown in Figure 4b. Then, as shown in Figure 4c, the pipe 9,10 is inserted with its upstream end 8 in the opening 7, a gasket 20 being used to achieve a liquid-tight joint.

[0019] To make it possible to insert the upstream end 8 on the pipe 9,10 in the opening 7 in the bottom section 5 as described above, it is, of course, a prerequisite that the pipe 9,10 to begin with may be placed in a position, in which the upstream end 8 is completely clear of the bottom section 5, as it would otherwise not be possible to get the pipe 9,10 into its place. The sliding muff 12 does, however, allow a withdrawal, i.e. a movement towards the right in Figures 1, 2 and 4, to such an extent that the assembly consisting of the pipe 9,10 and the short pipe 13 may be made sufficiently short to make it possible to lower it between the most upstream one of the concrete pipes 14 and the bottom section 5. When the upstream end 8 on the pipe section 9 and the downstream end on the short pipe 13 are in a position opposite the opening 7 and the most upstream concrete pipe 14 respectively, the assembly 9,10,13 may be extended by pulling the pipe 9,10 through a short distance out of the sliding muff 12, so that the pipe will be in the final position shown in Figure 1.

[0020] After some time dirt, sand and gravel unavoidably collect in the bottom of the bottom section 5 and possibly also in the lower part of the first curved pipe section 9. This sediment may be removed in a known manner by lifting the grate 4 and inserting a suction hosepipe into the bottom section 5. The sediment may, however have collected to such a level, that the lower part of the first curved pipe section 9 is also filled or partially filled with sediment, and it may occur that this sediment also remains after the removal by suction of the sediment in the bottom section 5 proper. In order to remedy this disadvan­tage a branch pipe 21 is placed on the upper side of the transition between the pipe sections 9 and 10, said branch pipe being connected to a flushing pipe 22, the upper end of which is closed with a cover 23 lying flush with the road surface in the usual manner. This makes it possible, preferably simultaneously with the removal by suction of the sediment from the bottom of the bottom section 5, to insert a flushing hosepipe in the pipe section 9, so that any sediment having collected here may be flushed down into the bottom section 5 and removed from the latter through the suction hosepipe. It is also possible in a manner not shown to insert the flushing conduit through the wall of the gutter receptacle, e.g. in a similar manner as the double-curved pipe 9,10, so that the flushing pipe becomes accessible by opening the grate 4, the flushing pipe here being closed by a removable plug.

[0021] The gutter receptacle 3, the pipes 14, and the main drainpipe 15 may in the usual manner consist of concrete, while the pipe 9,10 with the branch pipe 21, and the short pipe 13 with the sliding muff 12 may suitably consist of cast iron or plastic, such as hard PVC.

[0022] Referring to Figure 4 the attention is drawn to the fact that it is also possible to use a core ring 9 with an external profiling (not shown), so that the opening 7 may be moulded or cast with e.g. grooves for placing further sealing means in addition to the gasket 20. Even though in this manner the core ring 19 will be captive in the opening 7, it may easily be removed, since as described above it consists of a material with a relatively low strength.

Claims

1. An arrangement with a drainage receptacle (3,5) connected through a siphon trap connection (5,9) with a generally horizontal or slightly downwardly inclined drainage conduit (14), in which arrangement the siphon trap is constituted by the combination of at least part of the lower portion (5) of the drainage receptacle (3) and a conduit (9) extending upwardly and outwardly from said lower portion, said conduit opening into said drainage conduit,
characterized in that said outwardly and upwardly extending conduit is constituted by or comprised by a curved pipe section (9), the inlet end (8) of which is inserted liquid-tight in an opening (7) in the wall (6) of the receptacle (3,5).

2. An arrangement according to claim 1,
characterized in that the curved pipe section (9) constitutes a part of a pipe (9,10), the remaining part (10) of which is curved in the opposite direction in such a manner, that the outlet end (11) of the pipe extends generally parallel to its inlet end (8).

3. An arrangement according to claim 2,
characterized in that the pipe (9,10) with curvature in two opposite directions is longitudinally movably inserted in a sliding muff (12) with its outlet end (11) facing away from the drainage receptacle (3,5).

4. An arrangement according to any one or any of the claims 1-3 and with a flushing conduit (22,21) opening into the downstream portion (9) of the siphon trap, characterized in that the pipe (9,10) with curvature in two opposite directions comprises a branch pipe (21) facing upwardly in the operating position, said branch pipe (21) forming the flushing conduit together with a conduit (22) connected thereto and directed upwardly.

5. A method of casting a drainage receptacle or a bottom section (5) for a drainage receptacle (3) for use in an arrangement according to any one or any of the claims 1-4, characterized in that the opening (7) in the wall (6) of said receptacle is formed by using a casting core (19) of a material, the strength of which does not substantially exceed what is necessary to withstand the stresses occurring during casting and subsequent transport and handling without substantial deformation.

6. A method according to calim 5, charac­terized in that a generally ring-shaped casting core (19) is used.

7. A method according to claim 5 or 6, characterized in that a casting core is used having a profiled outer side for forming one or a number of ridges and/or grooves in the wall of the opening (7).

Drawing