RU2505652C2 - Method for construction of reinforced concrete shell and shell - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: shell includes pre-stressed reinforced concrete wall, rope bundles in ductubes, anchor device where each of rope ends is fixed. The shell is equipped with additional anchor devices fixed uniformly along outer surface of the shell at length of rope bundles. Ropes are placed in a bundle by rows and each row of ropes is fixed in a respective anchor device. Method for construction of the shell is suggested.

EFFECT: increasing operational reliability, durability and repairability of the structure.

7 cl, 6 dwg

Description

The invention relates to the field of construction, namely to the technology of reinforced concrete structures, mainly of cylindrical shape, for example, protective shells, shells of storages of liquids, gases, bulk and crushed materials, etc.,

A known method of constructing a prestressed reinforced concrete sheath, including the placement of bundles of ropes in the channel formers, the voltage of each of the ropes to the calculated value and fixing the ends of each of the ropes in the anchor device [1].

A known sheath, including a prestressed reinforced concrete wall, bundles of ropes placed in channel formers, an anchor device in which each end of the rope is fixed [1].

To ensure the necessary crimping of the known sheath during its construction and operation (during its maintenance and repair), a rope bundle is tensioned with a large number of ropes with a powerful and heavy jack. The bundle ropes are clamped in one anchor device. This reduces the operational reliability of the shell due to uneven stress and the occurrence of tensile stresses in the shell from anchoring in the anchor device, and there is no possibility of obtaining uniform friction on the surface of the shell under tension, the same (calculated) length and drawing of ropes. Heavy and expensive equipment is used to tension the ropes. The uneven arrangement of the ropes in the channel former leads to uneven friction of the ropes against the walls, and they are unevenly drawn. Beam ropes are difficult to access and it is difficult to replace them and the ability to add additional ropes during shell operation.

The result, to achieve which this technical solution is directed, is to increase the operational reliability, durability and maintainability of the structure.

This result is achieved due to the fact that in the method of constructing a prestressed reinforced concrete sheath, including the placement of bundles of ropes in the channel formers, the tension of each of the ropes to the calculated value and the fixation of the ends of each of the ropes in the anchor device along the outer surface of the sheath along the length of the bundles of ropes uniformly fix additional anchor devices, and the ropes in the bundle are placed in rows, and each of the rows of ropes is secured in the corresponding anchor device. The number of ropes in a row fixed in each of the anchor devices is selected as a multiple of the number of ropes in the bundle. The tension of the rows of ropes to the calculated value is made evenly over the entire surface of the sheath. Before tensioning the ropes, their outer surface and the inner surface of the channel formers are lubricated with an antifriction anticorrosive substance.

This result is achieved due to the fact that the sheath, including the prestressed reinforced concrete wall, bundles of ropes placed in the channel formers, the anchor device in which each end of the rope is fixed, is equipped with additional anchor devices uniformly fixed along the outer surface of the sheath along the length of the bundle of ropes, moreover the ropes in the bundle are placed in rows, and each of the rows of ropes is fixed in the corresponding anchor device. The channel former is made in a rectangular cross-section.

The indicated result is also achieved due to the fact that the antifriction anticorrosive grease is applied to the outer surface of the ropes and the inner surface of the channel formers.

An example embodiment of the invention is illustrated by drawings, in which Fig. 1 shows a diagram of the arrangement of rope bundles on the surface of the sheath, in Figs. 2, 3, 4 - fixing rows of ropes in anchor devices, in Fig. 5 - section AA, in Fig. 6 - diagram of loads.

The shell includes a prestressed reinforced concrete wall 1, bundles 2, 3 of ropes 4, which are placed in a bundle in rows 5-7, anchor devices 8-10 (Fig.2-4), in which the ends of the ropes 11-16 of the corresponding rows are fixed.

Anchor devices 8-10 are uniformly fixed along the outer surface of the sheath along the length of the bundles of 2, 3 ropes, in which the corresponding row of ropes of the bundle is fixed.

The number of ropes in a row fixed in each of the anchor devices is a multiple of the number of ropes in the bundle.

Anchor devices are made with channels 17 for passing ropes. A bunch of ropes is placed in the duct 18 of a rectangular shape.

A method of constructing a prestressed reinforced concrete shell is as follows. Along the outer surface of the sheath, where it is supposed to place a bundle of ropes, anchor devices are evenly fixed. In accordance with the calculation, the targeted placement of the rope bundle is carried out.

Each of the ropes is tensioned to the calculated value and each of the ends of the rope is fixed in the corresponding anchor device.

The number of ropes in a row fixed in each of the anchor devices is selected as a multiple of the number of ropes in the bundle. The tension of the ropes to the calculated value is produced in rows. A bunch of ropes is placed in a channel former, which is rectangular in shape.

Before tensioning the ropes, their outer surface, as well as the inner surface of the channel formers, are lubricated with an antifriction substance.

Since, according to table 1, when using jacks designed to tension a small number of ropes, their weight decreases sharply compared to jacks designed to tension a large number of ropes, it is possible to use a large number of small jacks (as more affordable, lightweight, compact and maintainable ) to ensure uniform crimping. The use of lighter equipment, as well as the availability of ropes for inspection and replacement, will increase the maintainability of the sheath, due to the possibility of adding additional ropes at any time during operation.

Table 1 The number of ropes in a bundle The number of anchor devices Jack weight, kg one 56 16 2 28 52 four fourteen 120 6 9 150 8 7 220 10 6 360 12 5 400 55 one 4500

As shown in Fig.6, pos.19, due to the uniform distribution of the anchor devices around the perimeter of the shell, uniform stress occurs in the shell, and splitting forces due to stress concentration are eliminated in it.

Due to the parallel arrangement of the ropes and the use of lubricant, it is possible to achieve uniform friction against the surface of the sheath and the ropes among themselves, as well as to obtain the same (calculated) length and drawing of the ropes.

Thus, the proposed technical solution will allow:

to increase operational reliability due to the uniform distribution of anchor devices around the perimeter of the shell for uniform stress and the absence of splitting concentrations in the reinforced concrete of the shell:

- to provide the ability to obtain uniform friction on the surface of the shell, the same (calculated) length and drawing of the ropes due to the parallel arrangement of the ropes:

- to provide manual installation of the ropes without the use of great effort, and the use of special devices, the tension of the ropes in small groups, to use a large number of small jacks (as more affordable, lightweight, compact and maintainable) to ensure uniform crimping:

- increase the maintainability of the sheath, due to the availability of ropes for inspection and replacement, the possibility of adding additional ropes at any time during operation.

The source of information

1. US patent No. 4207716, MKI E04H 7/20, 06/17/1980.

Claims (7)

1. A method of constructing a prestressed reinforced concrete sheath, including placing the rope bundles in the channel formers, the tension of each rope to the calculated value and fixing the ends of each rope in the anchor device, characterized in that additional anchor devices are uniformly fixed along the outer surface of the sheath along the length of the rope bundles, moreover, the ropes in the bundle are placed in rows, and the fastening of each of the rows of ropes is carried out in the corresponding anchor device. 2. The method of constructing a prestressed reinforced concrete sheath according to claim 1, characterized in that the number of ropes in a row fixed in each of the anchor devices is selected as a multiple of the number of ropes in the bundle. 3. The method of construction of the prestressed reinforced concrete sheath according to claim 1, characterized in that the tension of the rows of ropes to the calculated value is made uniformly over the entire surface of the sheath. 4. The method of construction of a curved reinforced concrete sheath according to claim 1, characterized in that before the tension of the ropes, their outer surface and the inner surface of the channel formers are lubricated with an antifriction anticorrosive substance. 5. A sheath, including a prestressed reinforced concrete wall, bundles of ropes placed in the channel formers, an anchor device in which each end of the rope is fixed, characterized in that it is equipped with additional anchor devices uniformly fixed along the outer surface of the sheath along the length of the rope bundle, the ropes being the beam is placed in rows, and each of the rows of ropes is fixed in the corresponding anchor device. 6. The shell according to claim 5, characterized in that the number of ropes in a row fixed in each of the anchor devices is a multiple of the number of ropes in the bundle. 7. The shell according to claim 5, characterized in that the channel former is made in a rectangular cross-section.

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