SE527271C2 - House foundation section comprising concrete beam cast in U shaped polystyrene element, has tapered inner arm for supporting sill used to carry supporting wall or column - Google Patents

Abstract

Insulation is laid on top of a drainage layer on the inner side of the inner arm of polystyrene element, up to a height where the arm becomes tapered in the upward direction. Reinforcement is laid inside the element. A sill (17) is screwed onto the cast beam (16) and a supporting wall (18) or column can be rested on top of this sill. The reinforcement and concrete around it combine to form a concrete slab (11) which extends upwards to a height level with the top side of the inner arm. The weight of the wall or column is supported by the beam outside the inner arm. The lower tapered section of the inner arm acts as a ledge for supporting the concrete slab. The element is rested on an underlay and its two arms define a channel in between for casting the concrete beam. A release film is secured to the inner side of the outer arm.

Description

527 271 wall above is transferred to the inner concrete beam by means of inclined and horizontal stirrups. It is also known from Swedish patent application 9401737-3 a U-shaped edge beam element with surface layer, whereby the load on a cast-in-place concrete beam is introduced into an internal concrete beam via intermittent concrete heels and locking.

The stated designs cause large cold bridges through the foundation beam, which increases the heat loss through the foundation and causes low floor temperature.

With a design according to the invention, the problems with cold bridges, joints in the base and load bearing capacity are solved. In addition, it is easy to lay out the edge beam elements and their low price because they have no surface layer and can be delivered directly from the foam factory to the construction site = lower shipping costs. It is also very easy and cheap to make the corner beam corner. The elements are sawn at 45 ° on the construction site. With the design according to the design requirements, the cold bridge against the internal concrete slab is completely broken off. This improves the insulation capacity of the entire base, corresponding to 70-100 mm of insulation under the entire base plate.

The structure will be described in more detail here by means of exemplary embodiments: Fig. 1 shows foundation elements according to the design requirement laid on drained layers, Fig. 2 shows the construction phase after foundation insulation and reinforcement have been installed, Fig. 3 shows finished base slab after concrete has been cast and the load-bearing concrete beam exposed. The upper outer wall is connected to the concrete beam, and Fig. 4 shows examples of how the load-bearing capacity is increased with an underlying base plate or base sole. The invention is mainly characterized in that inside the edge beam elements, all the way to the inner leg of said element, insulation is laid on a draining layer to a level where the inner leg of the edge beam elements tapers in the upward direction, that the decoration is inlaid elements, that the lower tapered portion of said inner leg forms a shoulder, that a wall sill is arranged screwed into said concrete beam, on which a load-bearing wall can be erected, that reinforcement and enclosing concrete form a concrete slab reaching up to said inner leg upper edge, and that load of wall or pillars is taken up by the load-bearing cast concrete beam on the outside of said inner leg.

The edge beam elements 3 with U-shaped cross-section are cut out of polystyrene blocks at a factory.

The length is 2.4-3.0 m. The elements 3 have an unbroken outlet 2 gutter which forms the shape of a concrete beam 16 which is cast on the construction site. The outer foam leg 4 of the U-element and its inner 5 thus form mold sides for the supporting concrete beam 16. The inner leg 5 extends unbroken up to the upper edge of the concrete slab 11, whereby the cold bridge via the concrete slab is broken.

The outer foam leg 4 is broken off after the concrete beam 16 has been cast and hardened.

In this way, a wider supporting concrete plinth beam is obtained (without surface layer of plaster). All load is lowered through the concrete beam 16. To remove the outer foam leg 4, a release foil 7 is applied to its inside. The foam body that is formed when cutting the element is used as insulation on the construction site, whereby no spillage occurs.

The invention will be described in more detail here by means of an exemplary embodiment: A draining layer 1 is laid on a shaft bottom, which is packed and leveled.

Then the edge beam elements 3 of polystyrene are laid out, starting at the corner of the base plate. The corner elements are said at a 45 ° angle. Weights are provisionally placed in the elements 6. Support filling 7 can be applied to the outside of the edge beam elements 3. Thereafter, the internal foam insulation 8 and 9 are laid, often in two layers. The next stage is the laying 10 of 527 271 4 of the required reinforcement 10 for the concrete slab 11, often grid reinforcement. Required beam reinforcement 12 is laid in the bottom. Then, if necessary, acid-resistant stirrups 13 are applied to the upper edge of the beam as torque-transmitting elements. They also act as holders for the upper edge reinforcement 14. An internal release cloth 7 is applied to the inside of the foam leg. After final assembly of the edge beam elements 3 and internal insulation 8 and 9, the concrete slab 11 can be cast.

After casting and the hardening of the concrete, the part 15 of the outer foam leg 4 and the release cloth 7 are removed. The supporting concrete beam 16 is then exposed.

Then the wall sill 17 is screwed to the concrete beam 16 and the overlying supporting wall 18 is erected. Loads of wall or pillars 18 are received by the load-bearing beam 16.

Where larger loads are present, reinforcement of the load-bearing capacity can be carried out through a load-distributing plate 19, the load from the concrete beam 16 being led down to the base plate 19 by receiving holes 20 through the bottom of the base element. In this case, very large loads can be transferred. The base plate 19 can advantageously be prefabricated, and laid in the drainage layer before the base elements 3 are mounted.

Claims (5)

10 15 20 25 30 527 271 5 Patent claims Housing foundation formed by U-shaped elements of polystyrene which are arranged to be laid on a base and that a concrete beam (16) is arranged to be cast in a formed groove (2) between the two legs (4, 5) of the elements and that a release foil ( 7) is arranged on the inside of the outer leg to assist in the removal of the outer leg (4) of the edge beam elements (3), characterized in that inside the edge beam elements (3), all the way to the inner leg (5) of said element, is insulation laid on a draining layer (1) to a level where the inner leg (5) of the edge beam elements (3) tapers in the upward direction, that the latch (12) is laid in the elements, that the lower tapered portion of the said inner leg (5) ) forms a shoulder, that a wall sill (17) is arranged screwed into the said concrete beam (16), on which a load-bearing wall (18) can be erected, that the annealing (10) and enclosing concrete form a concrete slab (11) which reaches up to said upper leg (5) upper edge, and to load of wall or pe lare (18) is received by the supporting cast concrete beam (16) on the outside of said inner leg (5). Housing foundation according to claim 1, characterized in that the tapered upper part of the said inner leg slopes along a straight distance. Housing foundation according to one of the preceding claims, characterized in that the concrete beam (16) is cast to the concrete slab (11) by means of torque-transmitting stirrups (13), at the upper edge of the beam. Housing foundation according to one of the preceding claims, characterized in that the edge beam elements are supported on a load-distributing plate (19) and that holes (20) extend through the bottom of the base elements. Housing foundation according to claim 4, characterized in that said base plate (19) is prefabricated.