Test method and device for segmented static load of rotating prestressed pipe pile
A technology of prestressed pipe pile and test device, which is applied in the test of basic structure, construction, basic structure engineering, etc., can solve the problem of high cost of static load test and achieve the effect of saving test cost.
Active Publication Date: 2016-03-30
ZHEJIANG UNIV
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Problems solved by technology
[0007] In order to overcome the high cost of the existing static load test, and the need to re-build the test platform for each test, and only the bearing capacity of the pile foundation can be measured (even with the self-balancing method, only two sections of the test pile can be measured) side resistance coefficient of the pile, side resistance of the pile, bearing capacity of the pile end)
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[0036] like figure 1 As shown, the prestressed pipe pile is divided into N sections. Taking four sections as an example, the prestressed pipe pile includes the first section of prestressed pipe pile 1, the second section of prestressed pipe pile 2, the third section of prestressed pipe pile 3 and Section 4 Prestressed pipe pile 4; the connection of prestressed pipe pile is as follows figure 1 As shown, each adjacent prestressed pipe pile is connected by a sleeve 6; the sleeve 6 includes an outer sleeve 6a and an inner sleeve 6b that are staggered, and the outer sleeve 6a is sleeved on the inner sleeve 6b. The radii of the outer sleeve 6a and the inner sleeve 6b are matched, and can cooperate and slide with each other; when the outer sleeve 6a and the inner sleeve 6b overlap, they can transmit force to each other;
[0037] like figure 1 , figure 2 As shown, the outer sleeve 6a is welded under the loaded steel plate 5a welded at the bottom of the prestressed pipe pile 3 in t...
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The invention discloses a rotary-type prestressed tubular pile segmentation static load test method and device. The device consists of prestressed tubular piles in a segmentation manner, wherein the junction of two adjacent segmented tubular piles is connected with a loading steel plate and a sleeve, a loading device consists of a jack and loading fans on two ends of the jack (the jack is a rotary-type jack and also comprises a loading fan connected to the tail end of a pull rod on the bottom of the jack), the position of the loading device is changed by hoisting a steel pipe, the loading fan can pass through a through hole on the loading steel plate, the loading fan is staggered to the through groove after the rotation, and the jack applies load to the pile by virtue of the loading fan. When the test is carried out for a first segment and a second segment, the loading fan connected to the bottom of the pull rod of a coring-type jack contacts the loading steel plate, so that side friction resistance of the tubular pile below the test tubular pile is used as a static load counter-force, and the success of the test can be guaranteed. The static load counter-force is provided by the side friction resistance of the pile body, the device can be recycled for multiple times, and the test cost can be effectively saved.
Description
technical field [0001] The invention relates to a segmental static load test method and device of a rotary prestressed pipe pile. Background technique [0002] Static load test refers to applying the axial pressure, axial upward pulling force on the top of the pile step by step according to the use function of the pile, or applying horizontal force at the same elevation of the bottom surface of the pile foundation cap, and observing the generation of corresponding detection points of the pile over time. settlement, uplift displacement or horizontal displacement, according to the relationship between load and displacement (ie curve) to determine the corresponding single pile vertical compressive bearing capacity, single pile vertical uplift bearing capacity or single pile horizontal bearing capacity test method. Pile foundation static load test is the most widely used method among various methods for testing pile foundation bearing capacity and is recognized as the most acc...
Claims
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IPC IPC(8): E02D33/00
CPCE02D33/00
Inventor 王奎华高柳肖偲吕述晖李振亚
Owner ZHEJIANG UNIV