CZ33632U1 - Prefabricated UHPC kerb - Google Patents

Description

The Industrial Property Office does not ascertain in the registration procedure whether the subject of the utility model meets the conditions of eligibility for protection pursuant to Section 1 of Act no. E. 478/1992 Coll.

Prefabricated curb from UHPC

Technical field

The technical solution concerns a prefabricated curb made of UHPC, an oblong rectangular shape

BACKGROUND OF THE INVENTION

To separate the pavement from the roadway, curbs of elongated rectangular shape are used, which are mostly stone or concrete.

Especially on road bridges, curbs can be used as permanent shuttering when making monolithic pavements or monolithic cornices.

There are known modern composite materials based on cements, fine aggregates and chemical additives, with a very low water coefficient, which are referred to in the literature as "Ultra High Performance Concrete", abbreviated to UHPC. These materials, also referred to as "ultra-high-quality concrete", achieve very high physical and mechanical properties.

UHPC materials differ significantly from conventional concrete. In addition to a high dose of cement (600 to 1000 kg / m ³ ), they contain only fine-grained aggregates (normally grain size up to 1 mm), fibers (microfibers with diameters up to 0.3 mm and lengths up to 20 mm), micro-fillers (superplatifiers and more). They are characterized by low water coefficient (w / c is up to about 0.25) and high metal or polymer fiber content (1 to 3% by volume of the mixture). In addition to their specifically fine-grained structure, UHPC materials are, in particular, high-strength cement-based composites achieving high compressive strength. The usual limit stated in foreign literature is 150 MPa or more. They have high residual tensile or flexural tensile strength after crack formation with high fracture energy and high ductility.

The aim of the technical solution is to propose a shape of UHPC curb that would be particularly suitable for use in combination with a monolithic pavement or bridge ledge.

The essence of the technical solution

This object is achieved by a prefabricated UHPC curb, elongated rectangular in shape, according to a technical solution, characterized in that it has at least one recess on the side facing the pavement to allow the flow of the monolithic pavement material.

The construction of the curb according to the technical solution enables to achieve higher resulting strength of the curb-monolithic pavement, resp. ledge. Compared to a classical stone curb, the curb is according to the technical solution significantly lighter, less brittle, very durable, frost-resistant and non-absorbent. At the same time, it is mechanically resistant to a stone curb.

According to a preferred embodiment, it comprises one central recess and two outer recesses, the central recess being separated from the side recesses by the ribs, while the outer recesses are open laterally.

According to a further preferred embodiment, an anchor darkness protrudes from the rib, which can be glued into the rib and / or a threaded sleeve is provided in the rib for screwing in the anchor darkness.

- 1 GB 33632 U1

Clarification of drawings

The technical solution will be described in more detail with reference to the drawings, in which the individual figures represent:

FIG. 1 shows an embodiment of a prefabricated curb according to the invention in a view of its side facing the pavement;

FIG. 2 shows the curb of FIG. 1 as seen from the outside thereof;

Fig. 3 - example of the installation of curb according to the technical solution between the road and pavement.

Examples of technical solutions

The prefabricated curb according to FIGS. 1 and 2 is made of a composite material based on cements, fine aggregates and chemical additives, referred to as "Ultra High Performance Concrete", abbreviated to UHPC, or "ultra-high-quality concrete".

The curb has an elongated cuboid shape that corresponds to the shape of commonly known stone curbs.

On its inner side, i.e. on the side facing the pavement 5, the curb is provided with one central recess 1 and two outer recesses 2.

The central recess 2 is separated from the side recesses 2 by the ribs 3. The side recesses 2 are open to the side so that when the curbs are laid side by side along the edge of the pavement 5, the two adjacent side recesses 2 of the adjacent curbs form a closed joint.

Anchoring darknesses 4 protrude from the ribs 3, which can be glued into the ribs 3 or threaded bushings can be embedded in the ribs 3 during manufacture, in which the threaded anchoring darkers 4 are then screwed.

When installing the pavers between the pavement 5 and the roadway 6, the curbstones are laid in a bed of drainage polymer concrete (see Fig. 3) and used as lost shuttering for the construction of monolithic pavement 5. Monolithic pavement material 5 thus, the properties of the resulting structure are improved.

Claims (4)

PROTECTION REQUIREMENTS A prefabricated UHPC curb having an elongated rectangular shape, characterized in that it has at least one recess (1, 2) on the side facing the pavement (5) to allow the flow of the monolithic pavement material. Prefabricated rectangle according to claim 1, characterized in that it comprises one central recess (1) and two outer recesses (2), the central recess (1) being separated from the side recesses (2) by the ribs (3), while the outer recess (2) open sideways. Prefabricated rectangle according to claim 1 or 2, characterized in that an anchorage (4) protrudes from the rib (3). -2GB 33632 U1 Prefabricated curb according to claim 3, characterized in that the anchor (4) is glued into the rib (3) and / or a threaded sleeve is provided in the rib (3) for screwing in the anchor dark (4).