GB2248468A

GB2248468A - Device for embedding in concrete for sanitary plumbing and drainage system

Info

Publication number: GB2248468A
Application number: GB9120077A
Authority: GB
Inventors: Kheok Soon Chin
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-09-20
Filing date: 1991-09-20
Publication date: 1992-04-08
Anticipated expiration: 2011-09-20
Also published as: GB9120077D0; KR920006592A; CN1060132A; KR960008704B1; GB2248468B

Abstract

A plastic receiver for embedding in concrete cast against formwork comprises a flange 1 with holes 2 for nailing onto the formwork. Through the flange 2 is a hollow pipe 3, 4 through which water and sewage can flow. The portion of the pipe 3 above the flange preferably has an inner diameter larger than the outer diameter of incoming pipe and fitting and the portion 4 below the flange preferably has an outer diameter smaller than the inner diameter of incoming plastic pipe and fitting. The top of the hollow pipe 3 is a removable cover 5 which is removed when incoming pipe or fitting is to be slotted into the hollow pipe. <IMAGE>

Description

PLASTIC RECEIVER FOR SANITARY PLUMBING AND DRAINAGE SYSTEM This invention relates to a plastic receiver which is to be nailed or anchored onto the formwork of concrete structural elements. After concreting of the structural elements it receives incoming plastic pipe and fitting used in sanitary plumbing and drainage system.

The conventional method adopted by plumbers to install rain water pipe, soil waste, ventilating stack, discharge pipe and plumbing fittings is costly and cumbersome. In addition to these because of sloppy workmanship, water seepage, leading to spalling of concrete next to the pipe often arises.

The conventional method, especially for cast-in-situ construction, usually involves making a wooden formwork in the shape of a box with both ends opened. The box is nailed to the formwork of the slab before concrete is poured. After curing, the formwork is stripped leaving an access hole in the slab to receive plastic pipes/fittings. Apart from wooden box, formwork of other shapes and materials are also used for leaving an access hole in the concreted slab. After installation of pipes/fittings, formwork at the underneath of the slab is prepared for covering the access hole. The formwork is then propped. Concrete mortar is mixed, usually manually and poured to fill up the hole. After curing, the formwork for the access hole is stripped off and then a skimming coat is applied to flush the rest of the ceiling which has been plastered.

The sequence of installation is cumbersome and costly.

Furthermore, during plastering and brick laying, debris may drop into the pipes and these have to be cleared to prevent the piping system form being clogged.

Due often to sloppy workmanship, the mortar are of low quality, highly porous and not well compacted, water seeps through the mortar and flows along the outer surface of the pipe where there is little adhesion of the smooth surface of the pipe and mortar. This causes corrosion of reinforcing steel bars and then followed by concrete spalling.

According to the present invention there is provided a receiver comprising (a) a hollow pipe with both ends opened to receive incoming sanitary plumbing and drainage pipe/fitting and subsequently for water and sewage to flow through, (b) a flange, preferably with nailing holes, for anchoring the receiver onto wooden formwork, and (c) the top end of the hollow pipe being closed by a cover which can be covered.

The receiver hereinafter described complements and improves on the installation of sanitary plumbing and drainage pipes/fittings in the following ways: (a) Since there is no access hole to be filled with mortar which is porous and lacks adhesion to pipe, the perennial problem of water seepage through the mortar and next to the pipe is avoided.

(b) With the use of the receiver there is no preparation and installation of formwork to leave an access hole; no need to fill the access hole with mortar after installation of pipes/fittings; no preparation of formwork and propping underneath the concreted slab to cover the access hole. Hence, the cumbersome sequence of installation of the receiver saves manpower and hence lower labour cost.

(c) The top of the receiver is covered by a removable cover and so during construction no problem of debris from broken bricks or plastic cement dropping into the pipe/fitting.

One particular and at present preferred embodiment of the invention is hereinafter described by reference to the accompanying drawings in which: Fig. 1 is a perspective view of a receiver; Fig. 2 shows the bottom plan view ofthe receiver; Fig. 3 shows the top plan view of the receiver; Fig. 4 illustrates the installation of the receiver.

The receiver comprises flange 1 with holes 2 for nailing onto the formwork. A hollow pipe 3, 4 passes through the flange.

The top end of the hollow pipe 3 is a removable cover 5 which prevents debris from falling into the pipe during building construction. Water flows through pipe 3 to pipe 4 and to prevent water leakage along the receiver, the internal diameter of pipe 3 is larger than the external diameter of incoming pipe/fitting 6 so that the pipe/fitting 6 coming from the top can be slotted inside pipe 3. As for pipe 4, its external diameter is smaller than the internal diameter of income pipe/fitting 7 so that the pipe/fitting 7 coming from the bottom can be slotted outside pipe 4.

To use the receiver, it is first aligned and then a hole 9 is cut in the wooden formwork 8. The hollow pipe 4 is noç slotted into the hole 9 and the receiver is nailed onto the formwork. Concrete structural elements i.e. slabs, columns and beams, are now ready for concreting 10 followed by connecting incoming pipe/fitting 6,7.

Claims

1. A receiver comprising (a) a hollow pipe with both ends opened to receive incoming sanitary plumbing and drainage pipe/fitting and subsequently for water and sewage to flow through, (b) a flange, preferably with nailing holes, for anchoring the receiver onto wooden formwork, and (c) the top end of the hollow pipe being closed by a cover which can be removed.

2. A receiver as claimed in claim 1 wherein, the flange can be of any shape and not restricted by dimensions.

3. A receiver as claimed in claim 1 or claim 2 wherein, the portion of the hollow pipe above the flange has an internal diameter just large enough for incoming pipe/fitting to be slotted inside it.

4. A receiver as claimed in claim 1 wherein, the portion of the hollow pipe below the flange has an outer diameter just small enough for inccming pipe/fitting to be slotted outside this portion of the hollow pipe.

5. A receiver as claimed in any preceding claim made from a plastic material.

6. A receiver as hereinbefore described with reference to, and as shown in, the accompanying drawing.