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Counter-force system suitable for pile foundation axial large-tonnage static load test
The invention discloses a counter-force system suitable for a pile foundation axial large-tonnage static load test. The counter-force system is characterized in that a plurality of groups of anchor cables are obliquely pulled to serve as ground anchors to be uniformly arranged along the periphery of a pile, and each group of anchor cable consists of a plurality of strands of steel strands; the anchor cables are fixed through ring beams; the ring beams are connected with a top beam through opposite-pull screw rods, so that the stress of hydraulic jacks in the loading and unloading processes is stable; in the test, the plurality of hydraulic jacks are connected in parallel for synchronous loading, the loading quantity is measured and recorded through load sensors on the jacks, the settlement measurement of a pile head is measured through a displacement sensor on a pile top, and rechecking is carried out according to the reading of a dial indicator on a datum beam. Besides, a strain gauge and a single-point settlement meter are pre-buried in a reinforcement cage of the test pile except for a sounding pipe, so that the strain capacity and the settlement capacity of each part of the test pile in the loading process are measured. The counter-force system has the advantages of being economical, simple, convenient, visual, safe, stable, small in occupied area and the like, and the large-tonnage static load test is carried out in a limited test site by adopting a small-sized counter-force device.
本发明公开了一种适用于桩基轴向大吨位静载试验的反力系统，包括：多组锚索斜拉作为地锚沿桩周均匀设置，每组锚索由多股钢绞线组成；锚索通过圈梁固定；圈梁与冠梁之间通过对拉螺杆连接，使液压千斤顶在加载和卸载过程中的受力稳定；试验采用多台液压千斤顶并联同步加载，并通过千斤顶上的荷重传感器测定并记录加载量,桩头的沉降测量通过桩顶的位移传感器测定，并根据基准梁上百分表的读数进行复核。此外，在试验桩的钢筋笼中除声测管外，预埋应变片和单点式沉降仪，以测定加载过程中试验桩各部位的应变量及沉降量。本发明具有经济、简便、直观、安全稳定、占地面积小等优点，实现了在有限的试验场地内采用小型反力装置进行大吨位静载试验。
Counter-force system suitable for pile foundation axial large-tonnage static load test
The invention discloses a counter-force system suitable for a pile foundation axial large-tonnage static load test. The counter-force system is characterized in that a plurality of groups of anchor cables are obliquely pulled to serve as ground anchors to be uniformly arranged along the periphery of a pile, and each group of anchor cable consists of a plurality of strands of steel strands; the anchor cables are fixed through ring beams; the ring beams are connected with a top beam through opposite-pull screw rods, so that the stress of hydraulic jacks in the loading and unloading processes is stable; in the test, the plurality of hydraulic jacks are connected in parallel for synchronous loading, the loading quantity is measured and recorded through load sensors on the jacks, the settlement measurement of a pile head is measured through a displacement sensor on a pile top, and rechecking is carried out according to the reading of a dial indicator on a datum beam. Besides, a strain gauge and a single-point settlement meter are pre-buried in a reinforcement cage of the test pile except for a sounding pipe, so that the strain capacity and the settlement capacity of each part of the test pile in the loading process are measured. The counter-force system has the advantages of being economical, simple, convenient, visual, safe, stable, small in occupied area and the like, and the large-tonnage static load test is carried out in a limited test site by adopting a small-sized counter-force device.
本发明公开了一种适用于桩基轴向大吨位静载试验的反力系统，包括：多组锚索斜拉作为地锚沿桩周均匀设置，每组锚索由多股钢绞线组成；锚索通过圈梁固定；圈梁与冠梁之间通过对拉螺杆连接，使液压千斤顶在加载和卸载过程中的受力稳定；试验采用多台液压千斤顶并联同步加载，并通过千斤顶上的荷重传感器测定并记录加载量,桩头的沉降测量通过桩顶的位移传感器测定，并根据基准梁上百分表的读数进行复核。此外，在试验桩的钢筋笼中除声测管外，预埋应变片和单点式沉降仪，以测定加载过程中试验桩各部位的应变量及沉降量。本发明具有经济、简便、直观、安全稳定、占地面积小等优点，实现了在有限的试验场地内采用小型反力装置进行大吨位静载试验。
Counter-force system suitable for pile foundation axial large-tonnage static load test
一种适用于桩基轴向大吨位静载试验的反力系统
TAO RAN (author) / WU ZUNQI (author) / YUE LI (author) / LI CHONG (author) / CHEN HAOZHE (author) / MAO JIANFENG (author) / LIU YANGYANG (author) / TANG ZIYANG (author) / YU YUNSHAN (author) / XU MINGLEI (author)
2021-09-14
Patent
Electronic Resource
Chinese
IPC:
E02D
FOUNDATIONS
,
Gründungen
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