RU53692U1 - FIXED FORMWORK - Google Patents

Abstract

The utility model relates to the field of construction and can be used in the construction or reconstruction of monolithic or prefabricated monolithic structures and, in particular, when concreting floors of buildings, spans of bridges and moorings.

The objective of the utility model is to increase the rigidity and strength of fixed formwork without increasing its weight and size and metal consumption. This, in turn, allows you to expand the formwork's ability to hold freshly laid concrete to a set of self-supporting strength

The subject of the utility model is a fixed formwork containing a forming element with anchors on its active surface and external reinforcement in the form of at least one composite tape based on high-strength (carbon, glass, aramid) fibers glued along the forming element on its front surface.

It is possible to perform longitudinal ribs

stiffness on the active surface of the forming element. In this case, the anchors can be embedded in stiffeners. External reinforcement may additionally include at least one tape based on high-strength fibers glued across the forming element on its front surface.

The use of a utility model makes it possible to concrete a massive monolithic part of a heavy span without the use of temporary supporting supports.

Description

Technical field

The utility model relates to the field of construction, and can be used in the construction or reconstruction of monolithic or prefabricated monolithic structures and, in particular, when concreting floors of buildings, spans of bridges and moorings. State of the art

When concreting building structures and, in particular, floors of buildings or spans of bridges and berths, fixed formwork is widely used, which is used once, after which it forms the prefabricated part of the precast-monolithic structure resulting from concreting and remains to work together with monolithic reinforced concrete [A.F. Matskevich. Fixed formwork of monolithic reinforced concrete structures. M., Stroyizdat, 1986].

Fixed formwork is known containing form-forming elements in the form of plates, for example reinforced concrete (including prestressed) [RF patents No. 20111772, 2046897, 2107783, 2109896, 2199635] or in the form of metal sheets of various types and profiles [RF patents No. No. 2041312, 2131005].

The fixed formwork selected as a prototype [RF patent No. 2109896] contains a forming element, anchors mounted on its active (concrete) surface, and external reinforcement in the form of a metal mesh.

In order for the non-removable formwork to be relatively light and convenient for transportation and installation, it is advisable to design a prefabricated-monolithic structure so that the massive monolithic part carries the main working load, and the prefabricated part mainly performs a shaping function.

However, the well-known fixed formwork made in this way, including the prototype, does not have sufficient rigidity and strength to withstand the pressure of a large mass of freshly laid concrete, and require the installation of additional fasteners or supports for the concrete to gain a monolithic part of self-supporting strength. For example, when erecting or reconstructing the spans of berths, which, as a rule, have a thickness of more than 1 meter, a length of more than 10 meters and a weight of more than 3 tons per square meter, using the known fixed formwork, it is necessary to support the formwork with inventory or temporary supports until until the concrete of the monolithic part gains self-supporting strength. Utility Model Essence

The objective of the utility model is to increase the rigidity and strength of fixed formwork without increasing its weight and size and metal consumption. This, in turn, will expand the formwork's ability to retain freshly laid concrete to a set of self-supporting strength.

The object of the utility model is a fixed formwork containing a forming element with anchors on its active surface and external reinforcement in the form of at least one composite tape based on high-strength fibers glued along the forming element on its front surface.

This allows you to solve the specified problem.

The utility model has development.

The first of them is that stiffeners are made along the active surface of the forming element along it. In this case, the anchors can be embedded in stiffeners.

Another development of the utility model is that the external reinforcement may additionally include at least one composite tape based on high-strength fibers, glued across the forming element on its front surface. Brief Description of the Figures

Figure 1 presents a fixed formwork, taking into account the development of a utility model. Figure 2 illustrates an example of using a utility model.

The implementation of the utility model In figure 1 is indicated:

1 - forming element of fixed formwork, for example reinforced concrete slab;

2 - active (intended for adhesion to concrete) surface of element 1;

3 - front (outer) surface of the element 1;

4 - composite tapes based on high-strength fibers, performing the functions of external reinforcement;

5 - stiffeners made on surface 2, along element 1;

6 - anchors embedded in the ribs 5.

As the forming elements 1 can be used reinforced concrete, reinforced cement, fiber-reinforced concrete flat or profile plates, as well as metal sheets of various profiles.

Composite tapes 4 are fabric (single-layer) or laminate (multi-layer) ribbons made on the basis of high tensile fibers (carbon, glass, aramid).

Tapes 4 are glued to the front surface 3 along the forming element 1 in the manufacture of fixed formwork. Sticker tapes 4 are made with polymer glue on dry concrete, which has reached 70 percent strength. The direction of the tape sticker along element 1 orientates the high-strength fibers, which are located along the tape 4, in the direction of the expected tensile

the forces acting on the formwork as part of a precast-monolithic structure.

Increasing the rigidity and strength of fixed formwork

A useful model in its manufacture (i.e., before the formwork becomes part of the building structure) expands the formwork's ability to retain freshly laid concrete mass that has not gained self-supporting strength, and, thus, opens up additional possibilities for reducing the labor input and cheaper construction and repair -restoration work on monolithic and precast-monolithic structures.

For example, the use of formwork according to a utility model in the construction of floors or spans allows you to abandon the complex system of removable formwork and supporting supports even if the concrete-cast monolithic part of the span has significant height (more than 1 m) and weight (more than 3 t / sq .m).

The following describes the use of the inventive formwork on the example of concreting the span of a bridge or pier (see figure 2).

Figure 2 further shows:

7 - support erected or reconstructed span;

8 - metal stiffening trusses welded to anchors 6;

9 - reinforcing bars connecting trusses 8;

10 - removable side formwork;

A utility model is used as follows. One or more elements 1 of the fixed formwork are laid down on the supports 7 with the active surface 2 downward along the span. The direction of the tapes 4 along the element 1 in this case corresponds to the direction of the tensile forces arising in the span. The active surface 2 of the element 1, equipped with anchors 6 and ribs 5, is facing up. To anchors 6

trusses 8 are welded, which are connected together by reinforcing rods 9 into a spatial reinforcing frame.

After the spatial reinforcing cage is formed, the monolithic part is enclosed by the side formwork 10 and the concrete mixture is laid. Fixed formwork according to a utility model without supporting supports can withstand the weight of a freshly laid concrete mix of a massive monolithic part. Side formwork 10 is removed after the concrete has set formwork strength.

The use of fixed formwork in accordance with the claimed utility model makes it possible to concrete a massive monolithic part of the span structure without the use of temporary supporting supports in cases where the known fixed formwork does not allow this. The result is achieved without increasing the metal consumption of the removable formwork and without deteriorating its mass-dimensional characteristics.

Claims (4)

1. Fixed formwork containing a forming element with anchors on its active surface and external reinforcement in the form of at least one composite tape based on high strength fibers glued along the forming element on its front surface. 2. The fixed formwork according to claim 1, in which stiffeners are made along the active surface of the forming element along it. 3. The fixed formwork according to claim 2, in which the anchors are embedded in stiffeners. 4. The fixed formwork according to claim 1, in which the external reinforcement further includes at least one composite tape based on high-strength fibers, glued across the forming element on its front surface.