A combined negative friction resistance testing device for cast-in-situ piles and its application method
A technology of negative friction resistance and testing device, which is applied in the test of basic structure, construction, and basic structure engineering, etc., can solve the problems such as the inability to meet the requirements of compaction parameter control, and achieve simple structure, convenient installation and unloading, low cost effect
Active Publication Date: 2018-12-11
HUNAN UNIV OF SCI & TECH
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Problems solved by technology
There are many indoor model test devices at home and abroad to study the negative friction resistance of the pile side, but the use of other indoor test devices to study the impact of the degree of compaction on the negative friction resistance of piles and soils cannot meet the requirements of the control of the parameters of the degree of compaction
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[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0026] Such as figure 1 , figure 2 As shown, the combined cast-in-situ pile negative friction resistance testing device of the present invention includes a first jack 1, a dial indicator 2, a load-transmitting device 3, a reaction force device 4, a second jack 5, and a pile bearing plate 6 , Settlement mark 7, bearing plate 8, handle 9, box 10, model pile 11, portal frame 12, box joint edge 13, strain gauge 14, earth pressure box 15 and drainage valve 16.
[0027] Described box body 10 is installed on the bottom plate of portal frame 12, and described box body comprises first box body and three second box bodies; Described first box body is the box-like structure of upper end opening; The second box is a cylindrical structure; multiple second boxes are connected to form a cylindrical structure and installed on the top of the first box, and the bottom of th...
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The invention discloses a negative friction testing device for a combined cast-in-place pile and a using method of the negative friction testing device. The negative friction testing device for the combined cast-in-place pile comprises a portal frame, a tank, a counter-force device, bearing plates, a transferring device, a first jack, a second jack and a model pile. The tank comprises a first tank body and a plurality of second tank bodies. The bearing plates are installed in the tank. The counter-force device is installed on the tank. The first jack is installed on a top beam of the portal frame and connected with the bearing plates through the transferring device. The counter-force device and the upper end of the model pile are connected through the second jack. Settling marks are arranged in filling between the first tank body and the second tank bodies as well as in filling between the second tank bodies, and the model pile is inserted in the filling. The bottom of the model pile is connected with an earth pressure box. According to the negative friction testing device, filling compaction uniformity can be ensured through the layered filling compaction stacking mode, the filling compaction degree parameters are effectively controlled, then the pile-earth state of a thick filling area can be simulated, and testing results are made to be more accurate and reliable.
Description
technical field [0001] The invention relates to a test device for pile-soil relationship and a use method thereof, in particular to a combined negative friction resistance test device for cast-in-situ piles and a use method thereof. Background technique [0002] There are many hilly areas in southern my country. In order to ensure the construction of building structures, thick fill foundations are widely used, and there are many pile foundation projects in these thick fill areas. Thick fill soil has the characteristics of easy compression and settlement, and the relative displacement between piles and soil is easy to produce side friction resistance, which is mainly negative friction resistance. Negative frictional resistance not only cannot provide bearing capacity, but will form a pull-down effect on the pile, greatly reducing the bearing capacity of the pile foundation. It will have a greater impact on the pile body before and after the completion of the pile foundation p...
Claims
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IPC IPC(8): E02D33/00
CPCE02D33/00
Inventor 龚拼陈秋南衣利伟尹君凡张程罗鹏
Owner HUNAN UNIV OF SCI & TECH