Uplift bearing capacity testing device for miniature fiber bar uplift pile

Abstract

The invention relates to the technical field of foundation bases, and relates to an uplift bearing capacity testing device for a miniature fiber bar uplift pile. According to the testing device, the upper portion of a first steel base plate is connected with a high-strength nut, the lower end of the first steel base plate is connected with a load sensor, the lower portion of the load sensor is connected with a second steel base plate, and the bottom of the second steel base plate is connected with a counter-force beam; jack base plates are placed on the two sides of a pile hole, the bottoms ofjacks are installed in the centers of the jack base plates, the tops of the jacks are tightly attached to third steel base plates, beam stools are placed on the jack base plates, and hooping bars andfiber bars in the pile hole are connected to form an uplift pile fiber bar cage; fiber bar lock heads and the fiber bars are anchored on an head-expanded high-strength drawing screw rod, displacementsensors are symmetrically arranged on the two sides of the pile top of the miniature fiber bar uplift pile, and the displacement sensors are fixedly arranged on a reference beam; and the two ends ofthe reference beam are correspondingly supported on buttresses. The testing device is simple to mount and high in operability, the safety and reliability are high, the device is not prone to be damaged, the device can be repeatedly used, the cost is low, and larger uplift bearing capacity can be obtained.

Description

Technical field: [0001] The present invention relates to the field of foundation technology, and relates to a device for testing the pullout bearing capacity of fiber-reinforced miniature uplift piles. Non-metallic fiber bars are used instead of traditional steel bars in micro-uplift piles. The device conducts the pull-out bearing capacity test on fiber-reinforced micro-pull piles (diameter 90-400mm), measures the displacement and bearing capacity during the pulling process, and studies its deformation characteristics and bearing performance. The test method is highly operable. The test device is simple and precise, and the cost is low. Background technique: [0002] With the advancement of urbanization, the more complex the shape of the building (structure) and the higher the number of floors, the deeper the foundation of the building (structure) is, the greater the impact of groundwater on the building and the greater the impact of the anti-floating problem. protrude. Th...

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Problems solved by technology

However, there is no relevant public report on how the fiber reinforcement in this micro-uplift pile works together under load, and how to achieve rapid anchorage and provide reliable anchorage during the pullout test and bearing capacity test.

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