CZ305689B6 - System for stabilization and fortification of cylindrical vaults - Google Patents

Abstract

The present invention enables stabilization and fortification of vaults (2, 3) of various form and arrangement, as well as maintenance of all the hanging layers of the vault (2, 3) including floor structure, whereby maintaining the initial vault ring only locally distorted by false stiffening ribs (4) performed in the vault thickness. In grooves (5), additionally performed in the vault (2, 3) masonry, there are performed hidden ribs (4) formed by high-strength polymer-cement mixture (6) reinforced by composite strips (1) based on carbon, optionally glass fibers and epoxy resin.

Description

System of stabilization and strengthening of barrel vaults

Field of technology

The invention relates to so-called false stiffening ribs additionally made in grooves in the masonry of a rolled vault.

Prior art

The hitherto common solution of the requirement for stabilization and strengthening of the vaults is realized in a number of specific cases by the execution of the so-called face reinforced concrete shell. In this case, the existing reinforced vault is additionally supported by the face vault, which creates a new visual part of the vault, and therefore the design of the face vault to strengthen historic vaults, which should preserve the historic face surface - eg plaster with painting, stucco plastic reliefs. historical masonry vaults, etc. - is inappropriate. In the case of strengthening the existing vault with a reverse vault, a solution can be made in which the original masonry interacts with the concrete of the reverse shell, or is the original vault hung on the reverse vault. A serious shortcoming of the reinforcement of the existing historical vault with the reverse vault is the rheological changes of the concrete of the reverse shell accompanied by its deformations, which may be the cause of the disruption of the original historical vault, or unsuitable thermal-humidity properties of the historical vault connected with the reverse vault may be the cause of gradual disturbance of the historical masonry vault, surface treatments, or paintings. Removal of undesirable thermal and moisture properties of the vault reinforced by the reverse shell requires, for example, compliance with special operating rules, intensive ventilation of the space, etc. Another disadvantage of the solution with the so-called reverse vault is the need to remove the floor structure and other leveling layers up to the back of the vault.

The essence of the invention

Said drawbacks and disadvantages are largely eliminated by the solution according to the invention, which makes it possible to preserve all the overlying layers of the vault and preserves the original face surface locally disturbed by false reinforcing ribs made in thickness, resp. in part of the thickness of the original vault. The essence of the invention is that it forms hidden ribs formed by a high-strength polymer-cement mixture reinforced with composite strips based on carbon, resp. glass fibers and epoxy resin in grooves additionally made in the masonry of the vault. The grooves for forming the stiffening ribs can advantageously be formed in the joints of the masonry vault arranged in a strip-like manner. Carbon tapes, or glass composite made of carbon or glass fabrics can be single-layer or multilayer glued with epoxy resin, are provided on both surfaces with fine sand rolled into the epoxy adhesive. Carbon tapes, or glass composites of the required length are pressed into a layer of polymer mortar filling to about two thirds the depth of the formed grooves, the width of which must allow reliable filling of the groove with polymer cement mortar and anchoring of inserted composite strips.

According to another embodiment, the length of the composite strips is determined with respect to the formation of a curved surface, the shape of which will be close to the shape of the vault so that the strips do not protrude from the vault surface.

According to another embodiment, the width of the strips is at most half the height of the groove made in the masonry of the vault. According to another embodiment, the height of the groove made in the masonry of the vault is equal to at most% of the height of the cross-section of the masonry vault at the apex, said condition applying in relation to the height of the reinforced masonry.

- 1 CZ 305689 B6

According to another embodiment, the connection of the segments of the composite strips is ensured in the drawn areas by their overlap in the length determined with respect to the magnitude of the tensile forces transmitted by the composite strips, this overlap in the pressed areas being halved.

Explanation of drawings

The invention will be elucidated in more detail with the aid of FIGS. 1 to 3. FIG. 1 schematically shows the composition of composite strips in a semicircular vault, or segmental vault. Fig. 2 shows a detail of an additionally made stiffening rib in a milled groove filled with a polymer-cement mixture and an interposed composite strip. Fig. 3 shows a detail of the interconnection of the composite tape segments of the retracted area and the interconnection of the composite tape segments in the pressed area of the vault.

Examples of embodiments of the invention

Fig. 1 shows an exemplary embodiment of concealed reinforcing ribs 4 of polymer-cement mixture 6 reinforced with composite strips 1 in a segmental vault 3 150 mm thick with a central angle of 120 ° with a span of 3.0 m, in a semicircular vault 2 150 mm thick with a span 3. .0 m and in a segmental vault 3 of a thickness of 150 mm at the apex and 300 mm in the heel cross - sections with a central angle of 120 ° with a span of 3.0 m.

Fig. 2 shows a detail of an additionally designed stiffening rib 4 in a milled groove 5 25 filled with a polymer-cement mixture 6 and with an inserted composite strip 1 of high-strength carbon, resp. glass fibers with a modified surface ensuring strength in cohesion in the contact joint of the composite strip and polymer-cement mortar.

Fig. 3 shows a detail of the interconnection of the segments of the composite strips 1 drawn in the region by the tabs 7 and the interconnection of the segments of the composite strips 1 in the pressed area.

Claims (5)

1. A system for stabilizing and reinforcing rolled vaults, characterized in that false stiffening ribs (4) are arranged in the grooves (5) additionally formed along the entire length of the profile of the vaults (2, 3). System according to claim 1, characterized in that the false reinforcing ribs (4) are formed from a high-strength polymer-cement mixture (6) reinforced with carbon and / or glass fiber composite strips (1) and an epoxy resin provided to ensure mutual cohesion. polymer-cement mixtures (6) and composite tapes (1). System according to claim 1 or 2, characterized in that the false reinforcing ribs (4) are reinforced by segments of composite strips (1) to form a curved surface which corresponds in shape to the profile of the vault (2, 3). System according to any one of the preceding claims, characterized in that the connections between the individual segments of the composite strips (1) are formed by the overlap of the strips (1). System according to any one of the preceding claims, characterized in that the profile of the false reinforcing ribs (4) corresponds to the dimensions of the additionally formed grooves (5) in the masonry of the vault (2, 3).