Anchoring connection method pulling-resistant device for single pile vertical pulling-resistant static load test

A technology of static load test and connection method, which is applied in the direction of basic structure test, construction, and basic structure engineering, etc. It can solve the problems of long preparation time for connection structures, safety threats at welding places, and long test preparation time, so as to save construction time , save the connection parts, the effect of simple structure

Inactive Publication Date: 2018-09-04
南京市建筑安装工程质量检测中心 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a detection device, first of all, because the connected longitudinal steel bar is a common steel bar for engineering use, its own strength can only be used as a reinforcing component in the foundation pile, and it is easy to be damaged under the high-strength external force of the pull-out static load test. Secondly, Since the vertical ordinary steel bar is exposed at the top of the test pile, it is usually deformed, bent, or even broken during the construction process, which makes it necessary to straighten the bent steel bar and weld the broken steel bar before the test. The erection position is high, and when the exposed steel bars are not enough, welding needs to be lengthened, so there are defects such as complicated processing and long inspection preparation time
In addition, the bent steel bars cannot be completely straight after being straightened. After the flange or the basket is stressed, it is easy to produce eccentricity, and the stress on each steel bar is uneven. In addition, there are many welding points of the steel bars, resulting in stress concentration. Pull off to terminate the test
[0003] Generally speaking, the existing detection device has a long preparation time for the connection structure, and the welding part is easily damaged during the detection. Once damaged, it needs to be re-welded and tested again. The test cycle is long and the overall efficiency is not high.
Moreover, special welding is required in the detection, and the processing cost for abnormal conditions is added, so the cost of detection is also high
In addition, the collapse of the weld will also pose a safety threat

Method used

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  • Anchoring connection method pulling-resistant device for single pile vertical pulling-resistant static load test
  • Anchoring connection method pulling-resistant device for single pile vertical pulling-resistant static load test
  • Anchoring connection method pulling-resistant device for single pile vertical pulling-resistant static load test

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] like Figure 1-4 As shown in Fig. 1, a single pile vertical pull-out static load test of the anchor connection method pull-out device, including the measured object and detection equipment. Wherein, the object to be tested is the test pile 2, which in this embodiment is specifically a cast-in-place pile, in which high-strength connectors are pre-embedded. The detection equipment includes buttresses 62 arranged on both sides of the test pile 2, a main beam 64 erected on the buttress 62 and suspended above the test pile 2, and a jack 66 arranged on the main beam 64, and the jack 66 is connected with a power device , Both sides of the test pile 2 are also provided with displacement detection structures, the output end of the jack 66 is connected to a number of pull rods 8 extending downward, and the test pile 2 is directly or indirectly anchored to the pull rods 8 through high-strength connectors.

[0067] Specifically, in this embodiment, the upper end of the jack 66, th...

Embodiment 2

[0076] like figure 1 , 4 As shown in -6, an anti-extraction device of an anchored connection method for a single pile vertical anti-extraction static load test is different from Embodiment 1 in that: the high-strength steel bar 4 is threadedly connected with the pull rod 8 through a sleeve 52.

[0077] Specifically, the pull rod 8 is also a high-strength connecting steel bar, and the outer surface is fully threaded. The casing 52 is provided with an internal thread so as to respectively screw the high-strength steel bar 4 and the anchor end of the tie rod 8 to connect the two. When pre-embedding, the high-strength steel bars 4 are also symmetrically bound on the concrete reinforcement cage. Note that the anchor ends 42 of the high-strength steel bars 4 are buried at a position 2 cm below the section of the pile top. The anchor ends 42 have a reserved length of 10-15 cm. Promptly need sleeve pipe 52 to be sleeved in the concrete pouring process of pile body, protect with plas...

Embodiment 3

[0080] like figure 1 , 7 As shown in -9, a single pile vertical pullout static load test of the anchor connection pullout device differs from Embodiment 1-2 in that the high-strength connector includes an anchor pull plate 54 arranged above the test pile 2, And some high-strength bolts 55 that are anchored to connect the anchor tie plate 54 and the test pile 2, and the upper end of the anchor tie plate 54 is anchored and connected with the pull rod 8.

[0081] This solution is especially suitable when the test pile 2 is a prestressed pipe pile and the anchor hole 24 is provided on the top end plate 21 of the pile body. Specifically, the number of high-strength bolts 55 in this embodiment is six, and preferably the positions of each high-strength bolt 55 are evenly distributed on the same circle B, and the positions of each tie rod 8 are also evenly distributed on the same circle C, and the circle where each tie rod 8 is located The projections of C and the circumference B wh...

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Abstract

The invention discloses an anchoring connection method pulling-resistant device for a single pile vertical pulling-resistant static load test. The structure of the anchoring connection method pulling-resistant device differs from tradition, a form that other high-strength connection parts are detachably anchored with pulling rods directly or indirectly is adopted, a series of problems brought by an existing form of utilizing base seat main steel bar namely regular steel bar welding are avoided, the anchoring connection method pulling-resistant device is suitable for filling piles and preformedpiles, convenient and stable in connection, uniform in force bearing and is safe and reliable, improvement of the site work efficiency and cost saving are facilitated, the accuracy of the measurementresult is also guaranteed, furthermore, when both vertical compression resistance and vertical pulling-resistant static load test are required to perform on a same foundation pile, limit of sequential order also does not exist, and the anchoring connection method pulling-resistant device for the single pile vertical pulling-resistant static load test is convenient and capable of saving time.

Description

technical field [0001] The invention relates to a detection device for building pile foundations. Background technique [0002] As the "foundation" of the building - the foundation pile, it plays an important role in engineering. In order to ensure the quality and safety of the project, it is necessary to carry out the pullout test of the pile foundation in time. The current general testing standard is "Technical Specifications for Building Foundation Pile Testing" JGJ106-2014. For cast-in-place piles, the test is usually carried out by directly connecting the longitudinal common steel bars in the test pile. The outer periphery of the flange, for prestressed pipe piles, is also welded with baskets or flanges after filling the core with ordinary steel bars. Such a detection device, first of all, because the connected longitudinal steel bar is a common steel bar for engineering use, its own strength can only be used as a reinforcing component in the foundation pile, and it i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D33/00
CPCE02D33/00
Inventor 邵龙周建民石平府吴永军李昌驭杜立春缪德彬黄哲朱建翔袁顺胡桂宝徐晖刘水束旸庄晓磊周挺周凯张兰浩
Owner 南京市建筑安装工程质量检测中心
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