RU2303681C1 - Method for floor or span structure erection - Google Patents

Abstract

FIELD: construction, particularly to erect or reconstruct cast-in-place or composite structures, particularly for building floor, bridge span and berth structures concreting.

SUBSTANCE: method involves mounting at least one retained form panel on building structure support assemblies, wherein working surface of the form panel has anchors; erecting three-dimensional frame of reinforcement bars on the anchors; installing side form; adhering composite strips to form panel face in longitudinal direction, wherein the composite strips are formed of material based on highly-strong carbon, glass or aramid fibers, and performing concreting operation. Method development and improvement are also disclosed. In accordance to method improvement and development form panel has longitudinal stiffening ribs made on working surface thereof. Anchors are embedded in the stiffening ribs. Three-dimensional frame is made as metal trusses installed on working surface of form panel and extending in longitudinal direction. The trusses are connected with each other through reinforcement bars. Composite strips are adhered to form panel before or after form panel mounting on support assemblies.

EFFECT: decreased labor inputs for structure erection, repair or reconstruction without retained form mass and size increase and without the use of inventory or temporary supports.

6 cl, 2 dwg

Description

Technical field

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

State of the art

Known methods for the construction of monolithic floors using concrete formwork for concreting them [see, for example, RF patent 2164580]. The disadvantage of such methods of erection of floors is the complexity of installing and removing inventory formwork and the additional costs for it.

There is a method of erecting ceilings by layer-by-layer concreting, in which the lower concrete layer, after removing its formwork, acts as a fixed formwork for the subsequent concrete layer [RF patent No. 2018603]. This method allows the use of a relatively simple formwork. Its disadvantage is the persistent high complexity of construction work using removable formwork and the need to use temporary supports that support overlap or span until the lower layer of concrete gains strength sufficient to hold the freshly laid concrete of the monolithic part.

Known methods for the construction of prefabricated monolithic floors or spans of bridges and moorings, including the installation of the prefabricated part of the structure as a fixed formwork element with subsequent reinforcement and concreting of a monolithic layer.

Moreover, reinforced concrete (including prestressed) slabs [RF patents Nos. 2046897, 2107783, 2109896, 2199635], metal sheets of various types and profiles [patents] are used as a fixed formwork element constituting the prefabricated part of the floor or span. RF №№ 2041312, 2131005] or steel parts of the span of the bridge or pier [RF patents №№ 2119004, 2142033].

Known methods of erecting floors or spans using fixed formwork allow avoiding labor costs for mounting and dismounting removable formwork, but when concreting a massive monolithic part, they show such disadvantages as: increased metal consumption or the need to use inventory supports and / or temporary supports occupying the space under the ceiling or span to set concrete with a monolithic part of self-supporting strength.

As a prototype of the claimed invention, the method of erecting floors using fixed formwork from prestressed concrete slabs [RF patent No. 2107783] is selected. The disadvantage of the prototype is the need to use inventory or temporary supports installed under fixed formwork for the perception of the weight of freshly laid concrete in the process of monolithic. Increasing the rigidity and strength of prestressed reinforced concrete slabs of the formwork to the required value leads to an increase in their mass and dimensions that is unacceptable from the point of view of transportation and installation.

SUMMARY OF THE INVENTION

The objective of the invention is to reduce the complexity of the construction, reconstruction or repair of the ceiling or span of the structure without increasing the mass and dimensions of fixed formwork and without the use of inventory supports or temporary supports.

This problem is solved by the proposed method of erecting a ceiling or span of a structure, which consists in installing at least one fixed formwork slab on the supporting structures of the structure, the active surface of which is equipped with anchors, forming a spatial reinforcing frame on the anchors, installing the side formwork and making concreting, and prior to concreting, composite tapes are glued onto the front surface of the formwork plate in its longitudinal direction based on high-strength wave windows.

For special applications, the method has the development and refinement, which consists in the fact that:

- mount the formwork plate having longitudinal stiffeners on the active surface;

- mount the formwork slab with anchors embedded in stiffeners;

- spatial reinforcing cage is formed in the form of metal trusses installed on the active surface of the formwork slab in its longitudinal direction and connected by reinforcing rods;

- composite tapes are glued to the formwork plate before or after its installation on supporting structures.

A brief description of the figures.

Figure 1 presents a view of a precast-monolithic overlap or span during the construction, reconstruction or repair (before concreting the monolithic part); figure 2 - prefabricated element of the floor (fixed formwork).

The implementation of the invention

The implementation of the method, taking into account its development, is illustrated by figures 1 and 2. The figures show:

1 - supporting structures of a constructed, reconstructed or repaired structure;

2 - fixed reinforced concrete formwork slab;

3 - active (concreted) surface of the plate 2;

4 - the front surface of the plate 2;

5 - longitudinal stiffeners on the surface 3 of the plate 2;

6 - anchors laid on the surface 3 of the plate 2 (for example, in the ribs 5);

7 - metal trusses welded to anchors 6;

8 - reinforcing bars connecting trusses 7 to which they are welded;

9 - removable side formwork;

10 - composite tape based on high strength fibers (figure 2).

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

The method, taking into account its development and refinements, is as follows.

On the supporting structures 1, one or more plates 2 are laid with the active surface 3 upward. In the case of the method during reconstruction or repair, the interchangeable or span elements are previously removed from the supporting structures 1. On the active surface 3 of the plate 2, anchors 6 are laid and longitudinal stiffeners 5 can be made. In the latter case, it is preferable to lay the anchors 6 in the ribs 5. Then, trusses 7 are installed in the longitudinal direction (along the ribs 5) on the slabs 2 and welded to the anchors 6. The trusses 7 are joined together by reinforcing rods 8 by welding to form a single spatial framework.

After the spatial reinforcing cage is formed, the monolithic part is enclosed with a removable shuttering 9 and the concrete mixture is laid. After a set of concrete formwork strengths, the formwork 9 can be removed.

Plates 2 before laying concrete mixture on them should be reinforced with tapes 10 (laminate or fabric), which are glued with epoxy onto the prepared front surface 4 of the fixed formwork plate 2 in the direction along the plate. The sticker of the tapes along the plate 2 orientates the high-strength fibers, which are located along the tapes 10, in the direction of tensile forces acting on the plate 2 during concreting of the floor or span.

This operation can be performed both before the installation of slabs 2 on the supports 1 (for example, in the factory production of slabs 2 as fixed formwork), and after the installation of slabs 2 on the supports 1. In all cases, it must precede the laying of the concrete mixture.

Plates 2 of fixed formwork, reinforced by plates 10, which absorb tensile stresses when the plates 2 are deflected, form, together with the spatial reinforcing frame 7 from the trusses 7 and the rods 8 welded to the anchors 6, a rigid structure that can withstand the weight of freshly laid concrete of massive overlap or span.

In this case, there is no need to install temporary supporting supports under the erected, reconstructed or repaired ceiling or span of the structure until the concrete mix gains self-supporting strength.

The method can be applied, in particular, in the construction or reconstruction of spans of marinas, 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.

Claims (6)

1. The method of erecting the floor of a building or a span of a structure, which consists in installing at least one fixed formwork slab on the supporting structures of the structure, the active surface of which is equipped with anchors, forming a spatial reinforcing frame on the anchors, installing the side formwork and concreting, in this case, prior to concreting, composite tapes based on high-strength fibers are glued to the front surface of the formwork plate in its longitudinal direction. 2. The method according to claim 1, in which a formwork plate with longitudinal stiffeners is mounted on the active surface. 3. The method according to claim 2, in which the formwork plate is mounted with anchors embedded in stiffeners. 4. The method according to claim 1, in which the reinforcing cage is formed in the form of metal trusses mounted on the active surface of the formwork slab in its longitudinal direction and connected by reinforcing rods. 5. The method according to claim 1, in which the composite tape is glued to the formwork plate before it is mounted on the supporting structures. 6. The method according to claim 1, in which composite tapes are glued to the formwork plate after its installation on supporting structures.

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