Monitoring method of cast-in-situ prestressed concrete members and tensile stress of prestressed steels

A technology of prestressed steel bars and tensile stress is applied in the direction of measuring the force of frequency change by measuring the frequency change of the stressed vibration element, which can solve the problem of losing the monitoring function, and achieve the effects of convenient operation, light weight and simple process.

Inactive Publication Date: 2013-05-15
SHENYANG JIANZHU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After the concrete sets and hardens, it will limit the expansion and contraction of the cable meter, thus making it lose its monitoring function

Method used

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  • Monitoring method of cast-in-situ prestressed concrete members and tensile stress of prestressed steels
  • Monitoring method of cast-in-situ prestressed concrete members and tensile stress of prestressed steels
  • Monitoring method of cast-in-situ prestressed concrete members and tensile stress of prestressed steels

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Embodiment 1

[0028] like figure 1 The schematic diagram of the three-dimensional structure of the protective device of the present invention is shown, and both ports of the columnar hollow pipe body 1 are provided with a plug 3; one end is a fixed port plug; the other end is a movable port plug, and the plug 3 is A through hole 2 is provided, and the outer diameter of the plug 3 is larger than the outer diameter of the pipe body 1 . The pipe body 1 is made of round steel pipe, with an outer diameter of 8-12 cm, a length of 0.6-1.0 m, and a thickness of 3-5 mm. The outer surface of the pipe body 1 is welded with a φ6 spiral steel bar 5 to strengthen the anchorage between the pipe body 1 and the concrete. Two through holes 4 are provided at the matching position of the pipe body 1 , one of which is provided in the middle as an oil injection hole, and the other is provided at the edge as a lead-out hole.

[0029] like figure 2 , image 3 , Figure 4 , Figure 5 The monitoring method fo...

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Abstract

The invention discloses a monitoring method of cast-in-situ prestressed concrete members and tensile stress of prestressed steels. The monitoring method of the cast-in-situ prestressed concrete members and the tensile stress of the prestressed steels comprises the following steps: (a) initial installation of monitored prestressed steels in a protection device: penetrating the monitored prestressed steels into through holes in the plugging center of a movable port of the protection device from a guiding pipe and then penetrating out of the through holes of the plugging center of a fixed port from the guiding pipe body; (b) installation of a steel rope gauge: stripping outsourcing layers which penetrate out of the prestressed steels of the procedure (a) to a certain range, directly fixing the steel rope gauge on the prestressed steels of stripped outsourcing layers, placing the prestressed steel with the steel rope gauge into the guiding pipe body of the protection, drawing out the steel rope gauge wires from guide wire holes of the guiding pipe body and welding a movable seal of the other end with the guiding pipe body; and (c) data acquisition of the steel rope gauge: drawing out the guide wires of the steel rope gauge obtained from the the procedure (b) and connecting the guide wires of the steel rope gauge with the the external data acquisition device. The data acquisition device is connected with a computer. The monitoring data of the monitoring method of the cast-in-situ prestressed concrete members and the tensile stress of the prestressed steels are stable and reliable.

Description

technical field [0001] The invention relates to a method for monitoring tensile stress, in particular to a method for monitoring the tensile stress of prestressed steel bars of cast-in-place prestressed concrete components, and belongs to the field of civil engineering. Background technique [0002] Prestressed concrete is to avoid premature cracks in reinforced concrete structures, make full use of high-strength steel bars and high-strength concrete, and try to reduce the tensile stress on the components by applying external forces before the concrete structures or components bear the load in use. Concrete members under compressive stress. To delay the appearance and development of concrete cracks, thereby improving the crack resistance and stiffness of components. [0003] After nearly half a century of development, the prestressed concrete structure has now become a very important structural form in civil engineering. The application of prestressed concrete has expande...

Claims

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Application Information

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IPC IPC(8): G01L1/10
Inventor 孙威王强金峤王占飞刘琳
Owner SHENYANG JIANZHU UNIVERSITY
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