Detecting system and method of prestressed steel strand anchorage cable tensioning force

A technology of prestressed steel strand and detection system, which is applied in the test of basic structure, construction, and basic structure engineering, etc. It can solve the problems of inability to monitor the anchor cable of prestressed steel strand for a long time, rough loss judgment, high cost of large projects, etc. , to achieve the effect of improving rapid monitoring ability, improving stability and reliability, and preventing failure

Active Publication Date: 2017-08-18
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the detection method is to convert the prestress by obtaining the strain by installing sensors, attaching strain gauges, and sound wave distance measurement through rod drilling. The cost is too high and inconvenient for large projects, and it is only suitable for scientific research; there is also the oil meter control method. Low (rough judgment on loss) and unable to monitor the prestress of prestressed steel strand anchor cables for a long time

Method used

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  • Detecting system and method of prestressed steel strand anchorage cable tensioning force
  • Detecting system and method of prestressed steel strand anchorage cable tensioning force
  • Detecting system and method of prestressed steel strand anchorage cable tensioning force

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A

[0042] ① The construction unit carries out construction laying out according to the design drawings of the retaining structure, determines the position of the drill hole 3 of the retaining structure of the rock mass 2, and constructs the borehole 3 in the rock mass 2; injects anchoring material into the borehole 3, so that The bottom of the borehole 3 forms an anchor 11 that is mutually consolidated with the rock mass 2; one end of the steel strand 1 reaches the bottom of the borehole 3 through the borehole 3, and is anchored with the anchor 11 at the bottom of the borehole 3; The other end of the line 1 passes through the supporting plate 4 and the anchor 5, and the supporting plate 4 is placed at the opening of the borehole 3, and anchored in the rock mass 2, and the anchor 5 is kept in contact with the supporting plate 4.

[0043] After the anchoring body 11 reaches the anchoring strength, it is stretched through one end of the steel strand 1 of the anchorage 5, and the stee...

Embodiment B

[0046] ①The process of transforming steel strand 1 into prestressed steel strand anchor cable 1a is completed through construction operations. -5 model anchorage 5 is taken as an example, the diameter of its steel strand 1 is 15.2 mm, and the number of 1 steel strand is 5.

[0047] ②Acceleration sensor 7 is fixedly installed on the end face of anchorage 5 through magnetic suction seat 71 (or rubber mud or gypsum mud). The vibration direction of acceleration sensor 7 should be parallel to the length direction of prestressed steel strand anchor cable 1a, such as figure 1 , 3 As shown, the acceleration sensor 7 is a YD-65 type product, the charge sensitivity is 414.15, the frequency measurement range is 5 to 2000 Hz, and there is a matching magnetic suction seat 71 .

[0048] ③ Select DH-5922 data collector 9 for the acceleration sensor, and connect the acceleration sensor 7 with a shielded cable through the matching charge adapter H5857-1. The socket of the supporting charge a...

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Abstract

The invention discloses a detecting system of prestressed steel strand anchorage cable tensioning force. The detecting system comprises steel strands, a rock body, a supporting plate, an anchorage device, and an anchorage body, wherein drill holes are formed in the rock body; the anchorage body which is fixedly connected with the rock body is arranged at the bottom of each of the drill holes; one end of each steel strand is anchored in the anchorage body at the bottom of each of the drill holes through the corresponding drill hole; the other end of each steel strand penetrates through the supporting plate and the anchorage device; the supporting plate is arranged at the orifices of the drill holes, and is anchored in the rock body; the anchorage device is kept in contact with the supporting plate; an acceleration sensor and a hammer vibrator are arranged on the anchorage device; and the acceleration sensor is connected with a computer. The detecting system disclosed by the invention has the advantages of being simple in structure, low in detection cost, and safe and reliable to use; and the detecting system not only can meet the requirement for large-area detection, but also can be adapted to the detection of effective tensioning force of various fasteners consisting of steel strands, anchorage devices matched with the steel strands, and the like. The invention further discloses a detecting method of prestressed steel strand anchorage cable tensioning force.

Description

technical field [0001] The invention relates to an anchoring force detection device and method for anchoring a rock mass with steel strands and anchorages, in particular to a detection system and method for tension force of prestressed steel strand anchor cables. Background technique [0002] The prestressed steel strand anchor cable anchoring technology has been widely used for its remarkable technical and economic benefits. As early as 1980, the coal mine reinforcement project in North Wales first appeared to use steel bars to strengthen the rock formation. In 1934, the heightening project of the Sherfa Dam in Algeria was the first to use prestressed steel strand anchor cables. For the first time in 1964, prestressed steel strand anchor cables were used in the dam foundation reinforcement of Meishan Reservoir. The early prestressed steel strand anchor cables used steel wire ropes, and the supporting anchorages were poor in reliability, resulting in low anchorage efficienc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D33/00
CPCE02D33/00E02D2600/10
Inventor 钟新谷张天予彭雄
Owner HUNAN UNIV OF SCI & TECH
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