A method of manufacturing a reinforced concrete contact network

 

(57) Abstract:

Use: in the production of concrete structures, mainly in the production of reinforced concrete, the contact network. The inventive method of manufacturing a reinforced concrete contact network includes laying in nests of the thrust units of rods main longitudinal reinforcement, pre-tension to one-half the required voltage, extra longitudinal Assembly and spiral reinforcement, the final tension of the main longitudinal reinforcement to a predetermined value of voltage, concreting and removal of the forms, the final tension of the main longitudinal reinforcement produce, together with the additional length of the rods which exceeds the length of the rods of the main longitudinal reinforcement in the relaxed condition on the value (from 0.88 to 0.95) from their full extension. 4 Il.

The invention relates to the production of reinforced concrete structures, mainly for the production of reinforced concrete, the contact network and can be used in the manufacture of power transmission poles, piles of shells, columns, and other extended structures with mixed reinforcement.

Famous when sung, concreting and removal of the forms [1]

There is also known a method of manufacturing reinforced concrete, the contact network, including the installation of a pre-tensioned rods of high strength wire [2] concreting and removal.

There is also known a method of manufacturing prestressed concrete products, including the installation of a pre-tensioned and UN-tensioned reinforcement of the steel rod, concreting and removal of the forms [3]

Of the known methods the closest in technical essence is a method of manufacturing prestressed products, including pre-tensed and relaxed valves [3]

In this way UN-tensioned reinforcement is installed post-tensioning prestressed rods and has no voltage, which requires a lot of work. In addition, the absence of voltage in the non-tensioned reinforcement leads to the fact that after hardening of the concrete, due to its shrinkage and creep additional voltage, resulting in reduction of fracture of structures.

The task of the invention is to reduce labor costs, increase fracture toughness and durability of structural support contact network.

This zaderej, and their length exceeds the length of pre-tensioned rods in a relaxed condition on the value (from 0.88 to 0.95) full lengthening of stressed rods.

The proposed method for the manufacture of reinforced concrete, the contact network with these restrictive signs, allows to reduce labor costs in manufacturing through installation and fixing of UN-tensioned rods in special nests, but due to a small tension on the amount of 0.05 to 0.12 from full extension tense valve to avoid the additional concrete stresses due to shrinkage and creep, and thus improve the crack resistance and durability of structures.

In the known methods of manufacturing pre-stressed concrete products mounting and fixing loose fittings requires more labor, and the absence of small tension of this valve causes the concrete to additional stresses due to shrinkage and creep of concrete and reduction of fracture of structures.

The novelty of the proposed method of manufacturing reinforced concrete, the contact network is to reduce labor costs in its manufacture, increase the fracture toughness and durability of structures.

the manufacture of the frame, as well as to increase their physical structures.

In the known method the analogue of [3] for installation, fixing of loose fittings require much work, and no additional stress unstressed reinforcement leads to a decrease of the fracture toughness of the products and durability.

The novelty of the proposed method, characterized by its distinctive features is to reduce labor costs in the manufacture of the reinforcement cage and improving the crack resistance of structures.

These properties have no method of manufacture of concrete products, therefore, the proposed solution has significant differences.

In Fig. 1 shows the experimental curve of the ratio of movements, loose fittings and hard valve and service life of reinforced concrete. The latter is the integral index of the most defining quality of supports. The highest values of life supports are achieved when the ratio of elongation relaxed and tense valves are within 0.05 to 0.12. The ratio obtained for the supports, in which the pre-tense valves the data to ensure the greatest longevity of the support in the proposed method, manufacturing support contact network adopted the ratio between the elongation of an unstressed reinforcement and extension of hard reinforcement, 0.05 to 0.12, or exceeding the relaxed length of the rods against the tense is (0,88 0,95) from the desired lengthening of hard reinforcement.

In Fig. 2 shows a General view of the location of reinforcing bars; Fig. 3 reinforcement cage after the tension of the valve; Fig. 4 - section reinforcing cage along a-A.

The figures shown: 1 rod pre-tensioned reinforcement; 2 additional rod reinforcement; 3 end anchor; 4, left thrust unit of the tensioning mechanism; 5 right thrust unit of the tensioning mechanism; 6 mounting ring; 7 spiral.

The proposed method is as follows.

Example 1. In Tolmachevo the ZBK make contact network with mixed reinforcement capacity of 80 kNm. Tense armature stronomical of high-strength wire with a diameter of 5 mm Control voltage armature 810 MPa. Tension rods of the valves of the class A-III with a diameter of 12 mm leg Length 13600 mm

In accordance with the project and subject to the anchors is harvested stronomical of 48 wires length 13800 mm Pranie lengthening loose rods to lengthen tense wires, equal to 0.1, we get the required length loose rods, equal to (lNN550,1=6 mm 5,5);

l 13655 6,0 13649 mm

Or taking into account the length of end anchors the relaxed length of the rods will be:

l 13649 + 240 13729 mm

After harvesting valve stronomical 1 is installed on the hard nodes 3 and 4 tensioning mechanisms and then stretched to 50% of the required effort, i.e., until the voltage in the wires is equal to 400 MPa. Then set loose rods 2, the mounting ring 5 and revive helix 6. After this pre-tensioned reinforcement to reach the controlled voltage 810 MPa and at the same time UN-tensioned reinforcement gets a little tension. Then under the frame is proforma, laying concrete, curbs second proforma and preliminary voltage is passed to the form. After centrifugation, steaming and wrecking bearing ready for testing.

Tests conducted at the crack showed an increase in the moment of crack formation by 10% against the moment of crack formation at the poles, which have loose fittings had no initial small voltage.

Example 2. In the same factory made contact network with mixed reinforcement begins 820 MPa, loose terminals of the armature of the class A-III with a diameter of 12 mm leg Length 10800 mm

In accordance with the project with consideration of anchors length strompaket will be 11000 mm, Then the elongation of strompaket within the envelope of support will be

< / BR>
Taking the ratio of the elongated relaxed and tense reinforcement equal to 0.1 will provide the necessary length of the non-tensioned rods (lNN440,1 4,4 5 mm);

l 10800 + 44 5 10839 mm

Or taking into account the length of end anchors

l 10839 + 240 10919 mm

Further stronomical set on persistent nodes 3, 4 tensioning mechanisms, pull pack on 50% of the required tension. Then set loose rods 2, mount the mounting ring 5 and revive helix 6. Then tense the muscles of the valve to reach the desired controlled voltage, at the same time UN-tensioned reinforcement gets a little tension. Then perform operations on the installation of formwork, concreting, centrifugation, removal of the forms.

Tested for crack resistance made support showed an increase of fracture toughness of 8% against the supports with non-stressed with rods.

Sources of information:

1 Kudryavtsev A. A. Carrier hundred the sites of buildings and structures. Series 3.501.1-138 Bearing reinforced concrete cantilever contact network of electrified Railways. Release 1/87. Products manufacturing plant. The working drawings. Giperprostranstvo.

3. Auth. St. USSR N 1323685. A method of manufacturing pre-stressed concrete products.

A method of manufacturing a reinforced concrete contact network, including laying in nests of the thrust units of rods main longitudinal reinforcement, pre-tension to one-half the required voltage, extra longitudinal Assembly and spiral reinforcement, the final tension of the main longitudinal reinforcement to a predetermined value of voltage, concreting and removal of the forms, characterized in that the final tension of the main longitudinal reinforcement produce, together with the additional length of the rods which exceeds the length of the rods of the main longitudinal reinforcement in the relaxed condition on the value 0,88 0,95 from their full extension.

 

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