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General operation method for reaching given pre-tightening torque of high-strength bolt for tower crane

A technology of high-strength bolts and operating methods, applied to cranes, wrenches, wrenches, etc., can solve problems such as large volume, unsatisfactory use requirements, and unsatisfactory structure.

Active Publication Date: 2014-12-10
DONGGUAN YIXIN QINGJIANG MACHINERY MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, domestic manufacturers produce electric torque wrenches exceeding 1500N·m, which are large in size and cannot meet the requirements of use in structure.
[0011] Therefore, none of the above 1-3 solutions can meet the requirements of use

Method used

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  • General operation method for reaching given pre-tightening torque of high-strength bolt for tower crane
  • General operation method for reaching given pre-tightening torque of high-strength bolt for tower crane
  • General operation method for reaching given pre-tightening torque of high-strength bolt for tower crane

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Embodiment Construction

[0047] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0048] Such as figure 1 As shown, the tower body 200 is connected by standard sections 100, and the connection between the standard sections is realized by high-strength bolts 102 passing through the connecting ears 101 at both ends of the main chord, and locked with lower nuts 103 and upper nuts 104 .

[0049] Such as Figure 2 to Figure 5 As shown, it is a connection structure diagram between several connection lugs 101 and the main chord 1001 of the standard section. Among them, such as Figure 2 to Figure 4 As shown, the connecting ear 101 is connected at the corner of the main chord 1001 of the standard section, and the distance from the center of the connecting ear 101 to the side of the main chord 1001 is L, as Figure 5 As shown, the connecting lug 101 is connected to the side of the main chord 1001 of the standard section,...

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Abstract

The invention discloses a general operation method for reaching the given pre-tightening torque of a high-strength bolt for a tower crane. The general operation method comprises the following steps: firstly, using a climbing frame to lift a tower crane rotating assembly and a part above the tower crane rotating assembly; secondly, placing additional standard sections at the top of a crane body; thirdly, penetrating each high-strength bolt; screwing a lower nut on the corresponding high-strength bolt, screwing each lower nut to be in the place with hands and preliminarily applying pre-tightening force by using a general wrench; fourthly, clamping a first open sleeve on the corresponding lower nut, rocking a torque wrench back and forth by using special tools until the pre-tightening torque is reached; fifthly, repeating the fourth step, wherein the special tools comprise the first open sleeve, a torque amplifier and the torque wrench; the first open sleeve comprises a first lower sleeve and a first panel; an opening which can be clamped on the lower nuts is formed in the first lower sleeve. By using the operation method disclosed by the invention, the determined pre-tightening force can be given for each high-strength bolt, the operation is convenient, both labor are saved in operation, the application range is wide, mounting persons can quickly adapt the high construction efficiency is high and the safety performance is high.

Description

technical field [0001] The invention relates to a method for connecting standard joints of tower cranes, in particular to a general operation method for high-strength bolts used in tower cranes to achieve a given pre-tightening moment. Background technique [0002] Such as figure 1 As shown, the standard section 100 is one of the most important structural parts of the tower crane. The two ends of the main chord of the standard section 100 are provided with connecting lugs 101, and the connecting lugs 101 between the standard sections 100 are often passed through high-strength bolts 102 and lower nuts 103 , The upper nut 104 is connected to form the tower body of the tower crane. In order to enhance the reliability of the high-strength bolt 102 . To prevent the connection end from loosening during work, the tower crane design specification stipulates that the design of the joint should ensure that under the action of external tension, there is a certain compression force be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B66C23/62B25B13/48
Inventor 李仲明吴斌
Owner DONGGUAN YIXIN QINGJIANG MACHINERY MFG
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