FR2758845A1 - Lost shuttering procedure for making swimming pool walls and steps - Google Patents

Abstract

A procedure for making a swimming pool from reinforced and vibrated concrete cast in one stage uses self-supporting shuttering panels (1) which are left in the concrete after casting. The shuttering panels are mounted on the concrete base of the pool by jacks (3), they are reinforced with rods and expanded metal, and fixed together by bolts (6). The thrust created by the concrete after casting is taken up by spikes (4) connected to the reinforcing elements (2). Once the cast concrete has set the inside of the pool can be tiled or otherwise surfaced without the need for other treatments.

Description

The present invention relates to the manufacture and use of self-supporting, self-supporting lost formwork walls for the construction of a vibrated reinforced concrete swimming pool poured in one go.

The construction of swimming pools made of poured concrete using formwork requires a great deal of formwork, formwork, leveling with several layers of plaster after formwork removal, very solid shoring to contain the thrust of the concrete during pouring.

The device according to the invention allows the economy of the formwork, the shoring, the layers of dressing and leveling plaster on the basin walls made of concrete poured in one go.

The formwork walls constituting the formwork of the walls of the basin may be made of several materials such as: hot-enameled sheet, fiber cement, precast, reinforced concrete, laminate or any other material which may be suitable for carrying out the invention and having essential qualities for the implementation of swimming pools and other works.

The invention consists in the use of formwork walls assembled together to form the formwork of the vertical walls of basins of various shapes and sizes, as well as the pool stairs.

The bottom of the self-supporting formwork walls (1) [Fig 1 and Fig 2] will be held at a height of 15 cm above the shaped bottom concrete (10) [Fig 1] by two jacks (3) [Fig 1, Fig 2 and Fig 3] which consist of threaded rods and nuts 8 mm in diameter (13) [Fig 1 and Fig 3]. These two jacks (3) [Fig 1,
Fig 2 and Fig 3] fixed to the wall-formwork panels by various methods and subjections depending on the nature of the material constituting the panels, are made of 8X13 tube (14) [Fig 3] in which the threaded end of the rods is introduced. The bottom end of the tube (14) [Fig 3] serves as a shoulder for the bearing of the nut which is used to adjust the height of the panel (3) [Fig 3]. The flat iron legs (6) [Fig i, Fig 2 and Fig 3] bent at 90, drilled at 8 mm, allow bolting of the panels together.

The formwork walls will be firmly held to the push of the concrete (5) [Fig 1] during the pouring of the walls by steel posts (4) [Fig 1, Fig 4 and Fig 5], driven into the natural ground and connected by ligatures (12) [Fig 1, Fig 4 and
Fig 5] in annealed steel wire (2) [Fig 1, Fig 2, Fig 4 and Fig 5].

The reinforcements in the case of prefabricated reinforced concrete wall-formwork panels will be stapled (7) [Fig 3, Fig 4 and Fig 5] to the expanded metal (8) [Fig 3, Fig 4 and Fig 5]. In other cases, the wall-formwork panels made of enamelled sheet metal, or fiber cement, or laminate or other materials will be fixed to the vertical reinforcements (frames) (2) [Fig 1, Fig 2, Fig 4 and Fig 5] by spot welding, screwing, gluing or other suitable fixing.

The excavation finished and the bottom concrete of form (10) [Fig 1] poured, we will install the pipes connecting the discharge nozzles, surface vacuum cleaner, bottom drain, etc ... opposite the necessary subjects which will be fixed in the formwork walls during casting, these subjects will therefore be poured into the concrete of the walls.

A polyane film will be nailed to the ground (11) [Fig 1] to avoid any fall of earth during the pouring of the concrete from the walls, the reinforcing steel to concrete (9) [Fig 1] will be placed on the concrete bottom form and vertically, we can then proceed with the installation of formwork walls.

The wall-formwork panels will be lowered into the excavation to be carried on their jacks (3) [Fig 1, Fig 2 and Fig 3] on the shaped concrete bottom (10) [Fig 1]. The formwork walls thus fixed by the ligatures (12) [Figl,
Fig 4 and Fig 5] to the stakes (4) [Fig 1, Fig 4 and Fig 5], aligned well plumb, we can proceed with the pouring of the concrete from the bottom (5) [Fig 1] then the walls (1) [Fig 1] in the same flow thus achieving a monolithic reinforced concrete basin, which will be solid and waterproof.

The formwork walls remaining in place sealed in the concrete walls will be, if in enameled sheet metal left as is, if in fiber cement painted or tiled, if in laminate left as or tiled and if in reinforced concrete precast tiled or painted. This process, whatever the nature of the panels, makes it possible to apply to them on the water side any suitable coatings suitable for aesthetics, cleaning and decoration as may be desired.

The use of the wall-formwork method also allows the repair of swimming pools with cracked agglomerates. It is enough to unseal the nozzles and surface vacuum cleaners, to fix them at a good distance to be sealed again in the formwork walls. The elements will be placed using their jacks on the existing raft to pour new monolithic concrete ensuring the tightness and solidity of the new basin. The elements will be held to the wall-agglo by anchor anchors and bolts by the reinforcement. An iron-concrete reinforcement will be placed beforehand on the bottom and the walls in agglos thus replacing the earth, the concrete bottom of the existing basin serving as a form bottom.

For galvanized steel structure basins with liner whose structure is corroded, the out of order liner will therefore be replaced by the formwork walls of this process. We will cut the sheet metal structure around the nozzles and surface vacuum cleaners and other subjects, we will lengthen the pipe connections to put these subjects in good place in the wall-formwork elements which will be placed on the concrete screed by their jacks, held by their frames by ligatures and stakes driven through the sheet in the earth fill, after having placed on the screed and on the sheets the concrete reinforcements necessary for the realization of a new monolithic hull.

If in each case we have to restore a free-form basin, the formwork walls will be poured into molds giving a bending to the radius required to match the forms of the existing basin.

Claims (2)

1- Device for making basins of various forms in vibrated reinforced concrete, poured in one go, bottom and walls using lost formwork, characterized in that it consists of a continuous formwork wall kept rigid non-deformable waterproof in the excavation carried out in the ground. 2- Device according to claim 1- characterized in that it is carried on its vertical rods and held by stakes driven into the earth walls of the excavation.