Method for judging occurrence time of transverse crack at bottom of prestressed box girder

A technology of transverse cracks and occurrence time, which is applied to bridges, bridge parts, bridge construction, etc., can solve the problems of increasing the workload of inspection and aggravating beam damage, etc., and achieves the effect of convenient implementation and strong practicability

Inactive Publication Date: 2015-06-24
青岛林川工程技术有限公司 +3
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Problems solved by technology

Due to the lack of a systematic method for judging the time of crack occurrence, the actual bearing capacity is usually verified by testing the crack length, surface crack width, maximum crack depth, and even load tests. Increased the workload of detection, but also aggravated the damage to the beam

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  • Method for judging occurrence time of transverse crack at bottom of prestressed box girder
  • Method for judging occurrence time of transverse crack at bottom of prestressed box girder
  • Method for judging occurrence time of transverse crack at bottom of prestressed box girder

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Embodiment Construction

[0019] combine figure 1 , figure 2 and image 3 , a method for judging the occurrence time of transverse cracks at the bottom of prestressed box girder girders, according to the following steps:

[0020] First, observe the general direction and location of the transverse cracks (referred to as cracks) 2 on the beam bottom 3, whether there is a gap 4 or a gap 5 at the edge of the cracks; and look for dust traces 6 across the cracks 2 along the length of the cracks 2.

[0021] Next, take a core sample 7 with a diameter not greater than 30mm along the depth direction of the crack 2, and break apart the core sample 7 to observe the interface between the concrete aggregate and the slurry on both sides of the crack 2.

[0022] Thirdly, observe the variation of the crack width on the surface of the transverse crack at the bottom of the box girder when the heavy-duty vehicle passes the bridge.

[0023] Finally, a comprehensive judgment is made on the cause and occurrence time of t...

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Abstract

The invention discloses a method for judging the occurrence time of transverse crack at the bottom of a prestressed box girder. The method is characterized by comprising the following steps: a, observing the general trend and the occurrence position of the transverse crack at the bottom of the box girder and whether the edge lines of the crack are identical or not and the trace of dust stretching over the crack is integrated or not; b, taking a core sample with the diameter of not more than 30 mm along the depth direction of the transverse crack and understanding the interface of aggregate and slurry of concrete at the transverse crack by observing the core sample; c, observing the change condition of the surface crack width of the transverse crack at the bottom of the box girder when an overload vehicle passes through a bridge; and d, judging the formation reason and the occurrence time of the transverse crack. The method is convenient to implement and high in practicability, can judge the occurrence time of the transverse crack at the bottom of the prestressed box girder quickly and accurately, and provides reference for further formulation of the crack repair scheme.

Description

technical field [0001] The invention relates to a method for judging the occurrence time of transverse cracks at the bottom of a prestressed box girder. Background technique [0002] Prestressed box girder is a relatively common form of bridge superstructure. Under the action of prestress, the concrete at the bottom of the box girder is in a state of compression, and transverse cracks are not allowed to occur during construction and service. This type of box girder generally has two construction forms: cast-in-place or prefabricated. Each link of prefabricated construction is controllable, and the quality of the beam body is also high, with few transverse cracks at the bottom of the beam; All links such as erection, formwork installation, and removal need repeated operations. If one or several links are not properly controlled, transverse cracks may occur at the bottom of the beam. After the box girder concrete is poured, it is usually sprinkled with water for curing. The c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01D19/00G01N33/38
Inventor 邵新鹏郭保林马德科王苍和董辉盖国晖李启乾张得文王亚堃兰彬谈军支鹏飞郭忠良李镇田晖
Owner 青岛林川工程技术有限公司
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