WO2010085860A1

WO2010085860A1 - Metal stop and expansion joint for concrete slabs

Info

Publication number: WO2010085860A1
Application number: PCT/BE2010/000003
Authority: WO
Inventors: Pierre Raymond Kerrels
Original assignee: Coredis-Comptoir De Representation Et De Distribution S.A.
Priority date: 2009-01-28
Filing date: 2010-01-20
Publication date: 2010-08-05
Also published as: BE1018635A5

Abstract

The invention relates to a joint for concrete slabs made of two portions (1, 2) arranged on either side of a median plane (A) between two concrete slabs and which end at the top of the joint in a horizontally arranged cold-rolled continuous flat bar (3, 8), characterised in that said continuous flat bars (3, 8) are aligned and mutually supported by supporting means (16, 18) arranged at regular distances and rigidly connected by the bottom surfaces thereof in order to obtain a joint with a smooth, stable top edge between the adjacent concrete slabs (14, 15). Each supporting means (16, 18) is provided with a longitudinal flange, located along the median plane A, intended for the assembly of the flat bars (3, 8) of the joint by a linking means (9) and a flange arranged transversely relative to the median plane A, in which one portion (19, 20) extends beyond said median plane A, intended for mutually supporting, on either side, the two juxtaposed flat bars (3, 8) so as to maintain said bars accurately and constantly on the same horizontal plane.

Description

DESCRIPTION

Metal stop and expansion joint for concrete slabs.

The present invention relates to the production of concrete surfaces and more particularly to the metal gasket used for this purpose to delimit the slabs. To achieve large concrete surfaces, this surface is divided into rectangular or square sections constituting the concrete slabs. This sharing is generally carried out using metal profiles delimiting each concrete slab and constituting the joint between the slabs. Advantageously, these seals are provided with means for absorbing variations in the dimensions of the slabs due to thermal variations. These joints must also be able to absorb heavy loads while maintaining the correct level of the slab surface and avoiding any deterioration of the edges of concrete slabs. For this purpose, these joints must meet the following criteria:

- provide effective protection of the sharp edge of concrete slabs;

- guarantee a positive anchorage to avoid any risk of taking off with the slab; - allow the realization of a sufficient thickness of material to avoid shearing of the slab due to weak points caused by the profile of the joint;

- allow the removal or expansion of slabs by such means and an interlocking type tenon and sleeve, which ensure in addition the maintenance level slabs.

Generally, these joints for concrete slabs are made from sheet steel profiles and more particularly of the type with double profile male and female interlocking such as tenon and sleeve which allows the expansion of the slabs and which oppose displacements. vertical when passing heavy loads.

Currently, there are already male and female interlocking seals offset downward from the median line of the slab to provide greater material thickness over the interlocking for increased strength. against the charges on the edges of the dal.

WO 99/55968 also discloses a structural joint for concrete slabs comprising on the one hand an L-shaped female profile whose vertical flange extends along the edge of the slab and up to the stop its upper and horizontal wing extends inwardly of the slab and on the other hand an L-shaped male profile which has the vertical also extends along the edge of the slab. and until the upper edge thereof and the horizontal flange extends outwardly of the slab so as to engage in the female profile of the adjacent slab.

The problem encountered with this type of profile is that it is laminated in continuous length and, when it is placed in the concrete, it cuts the thickness of the slab in two parts close to the joint. At this point, there is only half the thickness of the concrete on each side of the male and female profile which causes breakage initiators in the longitudinal direction of the slab.

Although this joint offers good resistance against vertical loads, there are nevertheless cracking primers at the ends of the horizontal sections of the profiles due to the fact that these joints extend continuously over the entire length of the slab while weakening the edges. concrete slabs. Indeed, the thickness or height of the concrete slabs is calculated to support maximum vertical loads but the edges of the slabs do not have any more height necessary to support these loads being given that they are interrupted along their entire length by the horizontal flange of the joint profile.

Another problem with this type of joint is that it offers only limited resistance to deformation of the sharp edge of the concrete slab, since the thickness of the profile which extends to the upper surface remains limited to the thickness of the sheet forming the profile. It is important to use joints that effectively strengthen the sharp edge of concrete slabs. In general, structural joints for concrete slabs comprise on the one hand an L-shaped female metal profile whose vertical flange extends along the edge of the slab and up to the upper edge of the slab. this one and on the other hand, an L-shaped male profile whose vertical wing also extends along the edge of the slab and up to the upper edge thereof, extending from continuous way along the entire length of the slab. These two profiles meet face to face to form the reinforced lips of the concrete slabs to join. These metal seals are heavy and expensive.

Another problem encountered with most of the joints produced in the world is that it is almost impossible to guarantee that the upper edges of the two half-slabs are perfectly level because of the lack of precision in the execution of the profiles. or cut plates in addition to the difference between the diameters of the assembly holes and the diameter of the screws. BE 1016147 A3 discloses a lighter metal gasket for concrete surfaces that partially meets the above problems. Indeed, this seal is characterized in that the upper surfaces of the two parts of the joint are made using continuous cold rolled flat irons so as to obtain a smooth upper surface and a sharp edge of the joint between the adjacent slab. In this embodiment, the flat irons are placed on edge, that is to say with their small side up. However, there is no maintenance or solid support between the juxtaposed flat irons and it is possible that a difference in level occurs during heavy loads at the joint. Indeed, the flat iron are only connected during the assembly of the joint, by plastic bolts which are intended for this purpose. break up when shrinking the adjacent concrete slab. At this time there is no longer any link or support between the flat iron of the anointed and effective maintenance at a horizontal level is no longer possible. The object of the present invention is to overcome the disadvantages mentioned above by economical, simple and effective means which will be described in more detail below.

For the sake of having lips on the surface of the concrete, which are presentable; wide enough with sharp corners and anchors as close as possible to the concrete surface, with a robust and inexpensive backing; the object of the present invention is to construct joints as follows:

- the cold-drawn steel plates, forming the lips, will be arranged horizontally with the studs welded under the lower surface of these dishes, so very close to the surface of the slab and will be folded inwards the thickness of the concrete for an ideal anchorage.

To guarantee the same level half-dal facing each other, the underside of the dishes will be provided with welded supports that extend under the lower surface of the flat juxtaposed so as to support exactly at the level of the carrier plate and vice versa.

Each of the dishes forming the lips of the joints are supported by the dish j uxtapose and this to less than 1 / 10th of a millimeter.

These supports are pierced with holes so as to assemble them by screws and nuts, generally made of plastic so as to break during thermal shrinkage of the concrete slabs.

For this purpose, the metal gasket according to the present invention is produced according to the features as described in the appended claims.

In order to make the invention better understood, an embodiment of the joint is described in the description which follows and in which reference is made to the attached drawings in which: FIG. 1 shows the preparation of a surface portion to be concreted in using a set of joints according to the invention; FIG. 2 shows a perspective detail of a first part of the joint with a median separation plate comprising male elements; Figure 3 shows a perspective detail of the second part of the seal according to the invention; Figure 4 is a perspective view of an assembly of the two parts according to the invention before pouring concrete; Figure 5 is a plan view of the assembly according to Figure 4; Figure 6 is a vertical sectional view of the metal seal after pouring concrete; Figures 7 and 8 are successively a side view and a plan view showing the underside of the drawn steel plates with their cooperating supports.

In Figure 1, there is shown a joint assembly, comprising male parts 1 and female parts 2, distributing the surface to be concreted in sections or dal square or rectangular.

Figures 2 and 3 show details of the seal in vertical section A-A in Figure 1.

As can be seen in FIG. 2, the first part 1 of the gasket, according to the invention, is made from a continuous flat iron 3, with a rectangular section, arranged horizontally, one of whose smaller lateral faces coincides with a median plane A, which lies between the concrete slabs, and will be placed side by side with a side face of a continuous flat iron of the concrete dal juxtaposed.

On the lower wide face of this flat iron 3 are welded, at regular distances, a series of studs 6 provided at their end with a head or enlargement 7. These studs 6 extend vertically downwards for a distance and are then inclined slightly downwards and inwards of the slab at an angle sufficient to allow effective attachment of the part 1 of the seal in the mass of the concrete.

Under the lower wide face of the flat iron 3 are also welded, at regular distances, supports 16. Each support 16 has a wing whose outer face is along the plane median A between the joints. This wing is advantageously provided with a hole for assembling the joints by connecting means 9. The support 1 6 also has a transverse wing, a part of which is welded to the lower face of the flat iron 3 and the other Part 19 extends beyond the median plane A so as to support the flat iron 8 (Figure 3) constituting the joint of the concrete slab juxtaposed.

In order to achieve a vertical separation between the juxtaposed concrete slabs, a vertical plate 4 is provided, as usual, which extends down substantially along the median plane A. This vertical plate 4 is advantageously welded onto the vertical portion and on the inner side of the studs 6 which is near the median A between the slabs. This sheet 4 extends down to about half the height of the concrete slab. At this level and on the lower side of the sheet 4 are welded, at regular distances, pins 5 which extend horizontally on either side of the sheet 4 and therefore the median plane A.

Under the tenons 5, the lower part of this first part 1 of the seal is extended downwards by a second sheet 17.

This bottom plate 17 extends over the entire length of the joint and in essence at the bottom of the concrete slab.

Figure 3 shows the second part 2 of the joint according to the invention. This part is also made using a longitudinal flat iron 8, arranged horizontally upwards of the joint so as to be arranged side by side with the flat iron 3 of the first part 1.

On the lower wide face of the flat iron 8 are welded, at regular distances, a series of studs 12 provided at their end with a head or enlargement 1 3. These studs 1 2 extend vertically downwards over a distance and are then inclined slightly downwards and inwards of the slab at an angle sufficient to allow effective attachment of the part 2 of the anointed in the mass of the concrete. Under the lower face of the flat iron 8 are also welded, at regular distances, supports 1 8 which will be advantageously identical to the supports 16 of the first part. Each support 1 8 has a wing whose outer face is along the median plane A between the joints. This wing is also provided with a hole arranged opposite the hole of the support 16 so as to be able to connect the two parts of the joint using means of assemblies 9. The support 18 also has a transverse wing, part of which is welded on the underside of the flat iron 8 and the other portion 20 extends beyond the median plane A so as to support the flat iron 3 of the joint of the concrete slab juxtaposed. The second portion 2 of the seal also comprises a series of independent sleeves 10, of equivalent length to the tenons 5 of the first part of the seal. These sleeves 10 will be substantially U-shaped forming a hollow portion 1 1 intended to cooperate with the protruding parts of the tenons 5. The sleeves 10 will advantageously be made of plastic and will be engaged separately on each of the protruding parts of the pins 5 before the casting of concrete.

In Figure 4 there is shown a joint section assembled before molding the concrete and showing the sleeves 10 of the second part 2 of the seal hung on the protruding parts of the pins 5 of the first part 1 of the seal. The two flat irons 3 and 8, arranged horizontally, are juxtaposed and form the upper live edge along the median plane A located between the concrete slabs. The flat iron 3 and 8 are connected together by means of assembly means or bolts, preferably plastic bolts, which can be introduced into the holes 9 provided in the lateral faces of the supports. 16 and 18, respectively integral flat irons 3 and 8. It is expected that these plastic bolts break after the concrete slabs, solidified, narrowed. The arrangement of the studs 12 can also be seen. FIG. 5 is a plan view corresponding to FIG. 4, in which the flat bars 3 and 8 can also be seen, and a portion of the tenons protruding from the plate 4 as well as the series of studs 6 of the first part 1. One can also see the sleeves 10 hooked on the protruding parts of the pins 5 and the series of studs 12 of the second part 2 of the seal. Figure 6 shows a cross-section in a gasket according to the invention after pouring the concrete. On the left, we can see, a concrete slab 14 whose upper edge, along the median plane A, is provided with the flat iron 3 firmly attached to the inside of the slab using the studs 6 with heads 7 and separated from the concrete of dal le 1 5, located on the right, thanks to the plates 4 and 17. The tenons, which are situated towards the mid-height of the slabs prevent displacements of levels in the vertical direction between slabs 14 and 1 5 when important requests on the upper surface. On the right side, we can see a concrete slab 1 5 whose upper edge, along the median plane A, is provided with flat iron 8 firmly attached to the inside of the slab using studs 12 with heads 1 3. The sleeve 10 is integral with the slab 1 5 but can move freely on the protruding portion of the post 5 of the slab 14. Figures 7 and 8 show an embodiment of the supports 16 and 18 in the form of slices. This is because pieces cut into slices from a length of a T-profile are particularly suitable and are readily available on the market. The support pieces are edge welded to the lower part of the flat bars 3 and 8 so that their longitudinal wings overlap along the median plane A and their holes 9 for their connecting means coincide. Since they are arranged in quincunxes, the wing portions 1 9 and 20, located transversely to the median plane A, and which extend beyond this median plane, support on both sides the two flat iron 3 and 8 so as to maintain exactly and continuously on the same horizontal plane. The wing portion 19 therefore supports the flat iron 8 and the wing portion 20 supports the flat iron 3. The implementation of the joints according to the invention is carried out as follows:

When the joints 1, 2 are assembled using connecting means such as screws passing through the holes 9 provided in the supports 16 and 1 8, as shown in Figure 1, pouring concrete in each section delimited by the joints 1, 2 to form a global surface composed of juxtaposed concrete slabs. The concrete is poured until it arrives flush (upper surface) flat irons 3, 8. At this time, the concrete will have poured on both sides of the separation plates 4, 17 and will have coated the studs 6, 1 2, the pieces of the pins 5 on the one hand from the separation or medial plane A and the sleeves 10 on the other hand from the separation.

After hardening, a joint is thus obtained as shown in FIG. 6 where the edge of a first slab 14 incorporating the first part 1 of joint and the edge of a second slab 1 incorporating the second part 2 can be seen. of the seal according to the invention. During the shrinkage due to the drying of the concrete, the temporary fastening means provided in the holes 9 will break and the slab 1 5 can then peel off the slab 14 and move slightly to the right. At the same time, the sleeves 10 will move slightly in the same way to the right while remaining attached to the protruding parts of the tenons 5 of the slab 14 and thus ensuring a distribution of loads and maintains the vertical level between the slabs of concrete.

This displacement, which may also occur due to temperature variations, will be much more flexible and without clashes or retained through the sleeves 10 of plastic. The vertical loads exerted on the upper surface will, therefore, distributed uniformly on the two slab edges.

The parts of the slabs located between the pieces of the pins 5 and sleeves 10 also allow the recovery of significant loads without excessive play at the joint. Indeed, these parts retain the total thickness of the slab thus avoiding the maximum cracks and the breakers in the longitudinal direction near the seal. Thanks to the invention, the ideal combination of the tenon and sleeve-based charge transfer principle is thus obtained, while leaving at regular intervals total thicknesses of the concrete, which gives the slab an optimum resistance by reducing significant break primers. Another advantage of the gasket according to the invention is that the quantity of steel required is greatly reduced while at the same time providing sharp edges reinforced and straight because they can be made from flat iron drawn steel instead of the folded edges of a sheet metal in the case of sheet steel profiles that are rougher and more expensive to produce. A further advantage of the invention is that the manufacture of the upper parts of the two parts 1 and 2 of the joint, consisting of the flat irons 3 and 8, the supports 16 and 18 and studs 6 and 12, can occur easily and easily. large series since they are identical and in principle form an inverted image of one another.

Of course, other embodiments are possible without departing from the scope of the present invention.

Claims

1. Joint for concrete slabs comprising means for separating (1, 2) slabs (14, 1 5) along a median plane (A) and means for horizontally moving the slabs relative to one another while avoiding any vertical displacement between the edges of slabs, the seal being constituted

- a first portion (1), incorporated in a first slab (14), comprising an upper edge (3) and a vertical wall (4) provided, towards the mid-height of the concrete slab and at regular distances, d a series of tenons (5) which extend horizontally on either side of the median plane (A) and of which a protruding part extends towards the outside of the slab (14) and - of a second part Incorporated in a second slab (15), comprising in its upper part an upper edge (8) and a series of sleeve - shaped elements (10) which extend towards the inside of the slab ( 15) and which are disposed facing the tenons (5) so as to cooperate with their protruding parts characterized in that the portions (1, 2) terminate upwardly of the joint by a continuous flat iron (3, 8) cold rolled horizontally and in that said flat flat irons (3, 8) are aligned and supported by means s of support (16, 18) arranged at regular distances and secured to their lower surfaces so as to obtain a joint with a smooth and stable upper surface between the adjacent slabs (14, 1 5).

2. Joint according to claim 1, characterized in that each support means (16, 18) is provided with a longitudinal flange, located along the median plane A, for the assembly of flat irons (3, 8) the joint by connecting means (9) and a wing disposed transversely to the medial plane A, a part (19, 20) extends beyond this median plane A, intended to support each other, on the other hand, the two flat iron juxtaposed (3, 8) so as to maintain exactly and continuously on the same horizontal plane.

3. Joint according to claim 1, characterized in that on the underside of the continuous flat irons (3, 8) are welded, at regular distances, a series of studs (6, 12) which extend vertically downwards. over a certain distance and are then inclined slightly inwards and downwards at an angle sufficient to allow effective attachment of the parts (1, 2) of the joint in the mass of concrete through their ends ending in enlargements or heads (7, 13).

4. Joint according to claims 1 and 2, characterized in that on the vertical section and on the inner side of the studs (6) which is near the median plane A is welded a vertical plate (4) which extends towards the down to about half the height of the concrete slab.

5. Joint according to claim 4, characterized in that on the lower side of the vertical sheet (4) are welded at regular distances, tenons (5) which extend horizontally on either side of the sheet ( 4) and consequently the median plane (A).

6. Joint according to claims 1 to 3, characterized in that a second vertical plate (17) is welded below the tenons (5) and which extends over the entire length of the joint and j usque down the concrete slab.

7. Joint according to claim 1, characterized in that the second portion (2) of the seal also comprises a series of sleeves (10), substantially U-shaped whose hollow portion (1 1) is intended to cooperate with the protruding parts of the tenons (5) of the first part (1) of the anointed.

8. Joint according to claim 7, characterized in that the sleeves (10) are made of plastic.