RU154148U1 - STRENGTHENING REINFORCEMENT CONCRETE MULTI-BLASTING FLOOR PLATE - Google Patents

Abstract

The reinforcement structure of a reinforced concrete multi-hollow floor slab, including additional reinforcement, which is placed and monolithic in grooves made in the stretched zone of the slab, and connected to the voids of the slab, the additional monolithic reinforcement is equipped with at least two monolithic anchors that are installed in the holes made in the holes the locations of these anchors, characterized in that below the grooves and holes made protrusions connected to the specified grooves and holes, while the height of the protrusion selected from the condition: C≤a + d / 2, where C is the height of the protrusion (the distance between the lower face of the slab and the lower face of the protrusion); a is the value of the protective layer of concrete of additional reinforcement; d is the diameter of the additional reinforcement.

Description

The utility model relates to construction, in particular, to reinforcement structures for multi-hollow reinforced concrete floor slabs, access to which is not possible from above, for example, floor slabs, used mainly in buildings with combined roofing.

There is a known reinforcement design of a stretched zone of a precast multi-hollow concrete slab, including reinforcing steel puffs and fastening elements that are placed in vertical holes formed in the slab. Puffs are placed in the voids of the plate from the side of its stretched zone, and each fastening element of the puffs is made in the form of a corner and an abutment rigidly interconnected, while the horizontal shelf of the corner interacts with the outer surface of the plate from the side of the compressed zone, and the emphasis is provided with a groove through which the tightening end rigidly fixed to the stop, for example, by means of a threaded connection (see patent RU No. 90100, IPC E04G 23/02, publ. 12/27/2009)

The closest technical solution is the reinforcement structure of a multi-hollow reinforced concrete slab, including additional reinforcement, which is placed and monolithic in the grooves made in the stretched zone of the slab. In this case, the grooves are made in the zones of the voids of the plate, connected to the indicated voids and equipped with clamps, in which the additional reinforced reinforcement is placed. Additional monolithic reinforcement is equipped with at least two monolithic anchors, which are installed in the holes made in the locations of the indicated anchors (see patent RU No. 147226, IPC E04G 23/02, publ. 10.27.2014)

However, the use of this design necessitates the use of reinforcement with a larger cross-sectional area, which increases the cost of the reinforcement structure.

The objective of the utility model was to develop a reinforced concrete multi-hollow slab reinforcement design that would reduce the cross-sectional area of the reinforcement or increase the bearing capacity, stiffness and crack resistance of the slab with the same cross-sectional area of the reinforcement.

The essence of the utility model is that the reinforcement structure of a reinforced concrete multi-hollow floor slab, including additional reinforcement, which is placed and monolithic in grooves made in the stretched zone of the slab, and connected to the voids of the slab, the additional monolithic reinforcement is equipped with at least two monolithic anchors which are installed in the holes made in the locations of the indicated anchors, while below the grooves and holes made protrusions connected to the specified grooves and about miles,

the height of the protrusion is selected from the condition: C≤a + d / 2, where

C is the height of the protrusion (the distance between the lower edge of the plate and the lower edge of the ledge);

a - the value of the protective layer of concrete additional reinforcement

d is the diameter of the additional reinforcement.

The technical result is as follows. Due to the protrusions connected to the grooves and openings, the proposed design allows to increase the bearing capacity, rigidity and crack resistance of the reinforced plate by 10-20% (compared with the reinforcement structure selected as the closest analogue) or reduce the cross-sectional area of reinforcement reinforcement by 10 -20%, which reduces the cost of the gain structure.

The utility model is illustrated by drawings, where in FIG. 1 shows a cross-sectional reinforcement structure of a reinforced concrete multi-hollow floor slab, in FIG. 2 is a section along A-A, in FIG. 3 - a section along BB.

The reinforcement structure of a reinforced concrete multi-hollow floor slab 1 from the side of the stretched zone of the specified slab includes grooves 2 that are made in the voids 3 of the plate 1. The grooves 2 are connected to the voids 3 in which the additional reinforcement 4 is placed. The length of the additional reinforcement 4, its diameter is determined by calculation based on the load acting on the plate 1 and its technical condition. Based on the same criteria, the required amount of additional reinforcement 4 and the place of its installation in the stretched zone of the plate 1 are determined by calculation. Additional reinforcement 4 is equipped with anchors 5, which are installed in holes 6 made in the locations of the indicated anchors 5. The minimum number of anchors 5 for each additional reinforcement 4 - two, which are equipped with the ends of this additional reinforcement (end anchors). Below the grooves 2 and the holes 6, the protrusions 7 are made.

After installation of the proposed design, it is monolithic in a reinforced concrete multi-hollow floor slab 1. When monolithic below the grooves 2, the protrusions 7 are connected, connected to the specified grooves 2 and holes 6. The height of the protrusion 7 is selected from the condition:

C≤a + d / 2, where

C is the height of the protrusion (the distance between the lower edge of the plate and the lower edge of the ledge);

a is the value of the protective layer of concrete of additional reinforcement (selected according to SP 63.13330.2012 "Concrete and reinforced concrete structures. Fundamentals");

d is the diameter of the additional reinforcement.

For example, it is necessary to install a class A400 rod with a diameter of 14 mm as additional reinforcement in a slab located indoors at normal humidity. The axis of the rod is located in the plane of the lower face of the plate. Then:

d = 14 mm;

a = 20 mm (selected according to SP 63.13330.2012 "Concrete and reinforced concrete structures. Basic provisions", Table 10.1). From here:

C = 20 mm + 14/2 mm;

C = 27 mm.

Claims (1)

The reinforcement structure of a reinforced concrete multi-hollow floor slab, including additional reinforcement, which is placed and monolithic in grooves made in the stretched zone of the slab, and connected to the voids of the slab, the additional monolithic reinforcement is equipped with at least two monolithic anchors that are installed in the holes made in the holes the locations of these anchors, characterized in that below the grooves and holes made protrusions connected to the specified grooves and holes, while the height of the protrusion selected from the condition: C≤a + d / 2, where C is the height of the protrusion (the distance between the lower face of the plate and the lower face of the protrusion); a - the value of the protective layer of concrete additional reinforcement; d is the diameter of the additional reinforcement.

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