Device to reinforce beam structures

FIELD: construction.

SUBSTANCE: device to reinforce beam structures includes prestressed four-branch braced ties fixed at ends of the beam in its upper part, resting in areas of bending at hinged cylindrical supports with a pad, installed in the lower part of the beam and tightened by yokes. In the upper end zone of the beam there are angular profiles installed onto a footing, where braced ties are fixed as a tightened assembly.

EFFECT: increased bearing capacity due to balance of forces in all bands of a braced system.

2 cl, 4 dwg

 

The invention relates to the construction, namely the strengthening of beam structures maintained buildings.

In practice, the operation of beam structures, such as reinforced concrete beams, there is a need to strengthen them due to the increased pressures or because of defects.

A device for strengthening reinforced concrete beams, consisting of dvuhvetvevoj trussed torque, pridneprovem additional tension bands, with moveable legs (see a/with the USSR №1170097 CL E04C 23/02, 1985).

The drawbacks are the complexity of manufacturing, the need for a smooth, necessary for sliding of the movable supports, the bottom surface of the beam, it is difficult to ensure that operated in beams; in the zone of maximum bending moment there are only two working torque, two additional thrust play a role only tensioner that may be insufficient when zooming in on them operating load.

Know another device gain beams with prestressed wood bongs with additional prestressed elements in the passage area of the beam (see a/with the USSR №1434062 CL E04C 23/02, 1989).

A disadvantage of this device gain is the complexity of the prestress of separate tensioning devices (tension coupling the main strands and two delays is more cords), the inability to implement uniform tension cords.

The closest. the invention is a device for strengthening beams of four prestressed strands (see kN. Onufriev N.M. Simple ways of strengthening reinforced concrete structures for industrial buildings, L. - M.: Gastrolyzer, 1958. p.64-65 Fig.31).

The disadvantage of this device gain of the beam is the impossibility of uniform distribution of effort in the strands of the amplification device. This leads to an overload of one branch trussed system torque relative to another and reduces the overall carrying capacity and reliable operation of the amplification system.

The invention is aimed at improving the overall bearing capacity due to the alignment of efforts across all strands trussed system.

The result is achieved that the device for strengthening beam structures, including prestressed chetyrehvetvevymi trussed torque, attached to the ends of the beam in its upper part, supported in places knuckle hinge cylindrical supports with lining installed in the lower part of the passage zone of the beam and tightened the clamps according to the invention in the upper end zone of the beam is installed on Shorty, can be rotated angle profiles, in which the tensioning node is fixed trussed torque, while the hand is the shorties featu the wife in the center of the end face of the beam.

The result is achieved by the fact that the possibilities for accommodation chetyrehvetvevym cords in height the thickness of the lining of the cylindrical supports of the lower bands is made greater than the thickness of the lining of the supports of the upper strands of the value more than the diameter of the strands.

1 shows a device for the amplification of the beam structure; figure 2 attachment puffs in the upper part of the beam; figure 3 type And site of attachment of the puffs in the upper part of the beam in figure 4 node 1 in figure 1.

The amplified beam 1 with tense wood top 2 and bottom 3 puffs at the top end of the beam 1 is provided on the center of the Shorty 6 (short angular profile), which is based in the centre of the length of the angle profile 4, which stretch the node 5 is fixed torque 2 and 3. Corner profile 4 relies on Shorty 6, mounted on the end of the beam that provides the rotation angular profile 4 in two planes. The upper branch 2 in the span of the beam 1 is supported on a movable pivot bearing 7, and the bottom 3 on the supports 8. The upper branches of the fibers 2 in the lower part of the passage zone of the beam pulled one clamping collar 9, and the lower 3 - one or two clamps 9. For accommodation chetyrehvetvevym cords in height the thickness of the lining cylindrical supports 8 of the lower tie rod 3 is made greater than the thickness of the lining of the supports 7 of the top 2 strands of the value more than the diameter of the strand is.

Strengthening beam construction performed in the following sequence.

Perform installation of korotyshej 6 in the center of the upper end of the beam 1, and then produce the installation of corner profiles 4 hole corner profiles 4 insert the threaded upper ends of the fibers 2. In the lower part of the passage zone of the beam 1 set cylindrical bearing lining 7, tighten the ends of the branches 2 with nuts the tension of the node 5. Then at the bottom of the hole angular profiles 4 insert the threaded ends of the tie rod 3, establish cylindrical bearing lining 8, tighten the ends of the branches 3 to node 5. In the lower part of the passage zone of the beam 1 by tightening 2, 3 put the pinch clamps 9, create a preliminary voltage control its size. On the lower branch 3 can be worn two clamp 9.

This embodiment of the proposed device for strengthening beam structures in comparison with the known solutions enables you to evenly distribute the force of the tightening device, which prevents overloading of individual puffs and increases the overall carrying capacity of beams and reliability trussed amplification system.

1. Device for strengthening beam structures, including prestressed chetyrehvetvevymi trussed torque, attached to the ends of the beam in its upper part, supported in places re the IBA hinge cylindrical supports with lining, installed in the lower part of the passage zone of the beam and tightened the clamps, characterized in that, in the ends of the top beam set supported on the hand is the shorties can be rotated angle profiles, in which the tensioning node is fixed trussed torque, while the hand is the shorties are located in the center of the end face of the beam.

2. The device according to claim 1, characterized in that for pairwise placement chetyrehvetvevym cords in height the thickness of the lining of the cylindrical supports of the lower cords greater than the thickness of the lining of the supports of the upper strands of the value more than the diameter of the strands.



 

Same patents:

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2 tbl

FIELD: construction.

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15 cl, 11 dwg

FIELD: construction.

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FIELD: chemistry.

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11 cl, 15 ex

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3 dwg

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5 cl, 1 tbl

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5 cl

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17 cl, 2 dwg

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12 cl, 14 cl, 2 ex

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9 dwg

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