Construction method of cover-excavation top-down permanent steel pipe column
A technology of cover and excavation reverse work and construction method, which is applied in basic structure engineering, basic structure test, sheet pile wall and other directions, can solve the problem that there is no complete, mature and safe construction method and positioning accuracy for the installation and positioning of large diameter steel pipe columns Unable to guarantee and other problems, to achieve the effect of ensuring project quality and safety performance, and accurate positioning
Pending Publication Date: 2020-11-20
THE 4TH ENG OF CHINA RAILWAY 5TH ENG GROUP +1
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Problems solved by technology
However, the HPE hydraulic vertical method cannot guarantee the positioning accuracy after exceeding a certain depth
[0005] At present, there is no complete, mature and safe construction method for the installation and positioning of large-diameter steel pipe columns in large-scale comprehensive transportation hub projects
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[0025] A construction method for cover-excavation and upside-down permanent steel pipe columns, please refer to figure 1 , including the following steps:
[0026] S1. Pile position is centered, steel casing is installed, and the drilling machine is drilled: use a full casing full-rotary drilling rig to rotate and press the steel casing into the pile location, and perform drilling operations at the same time, so that the steel casing is ahead of the drilling depth and inspected. Verticality of steel casing and hole verticality;
[0027] Before installing the steel casing, the construction site is leveled, and the central line of the pile position and the positioning pile are released by a total station, and then led out to the control pile. In this embodiment, the control pile is made of Φ12 steel bars, and its Drive into the ground at least 30cm below the ground, check the pile position and the pile center repeatedly, and after confirming that it is correct, hoist the base of...
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The invention relates to a construction method of a cover-excavation top-down permanent steel pipe column, which comprises the following steps: S1, centering a pile position, mounting a steel sleeve and forming a hole by a drilling machine: pressing the steel sleeve into the pile position in a rotating manner by adopting a full-sleeve full-slewing drilling machine, and performing drilling operation at the same time to enable the steel sleeve to advance the drilling depth and detect the perpendicularity of the steel sleeve and the hole-forming perpendicularity; S2, installing a reinforcement cage, and pouring pile foundation concrete; S3, mounting a steel pipe column and checking the perpendicularity of the steel pipe column: mounting a perpendicularity sensor on the steel pipe column, putting the steel pipe column into a full-casing full-slewing drilling machine for hoisting, mounting a plurality of hydraulic jacks on the outer wall of the steel pipe column, and controlling the hydraulic jacks to adjust the position of the steel pipe column according to readings of the perpendicularity sensor. According to the construction method of the cover-excavation top-down permanent steel pipe column, the perpendicularity of the formed hole and the perpendicularity of the steel pipe column can be monitored, deviation rectification is conducted in time, then the installation precision andperpendicularity of the steel pipe column are guaranteed, and the engineering quality and safety performance of a cover-excavation top-down structure are guaranteed.
Description
technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a construction method for cover-excavation and upside-down permanent steel pipe columns. Background technique [0002] With the vigorous development of rail transit construction, the demand for building subway stations in densely built areas is becoming more and more intense. The use of open and cut construction for subway stations in the center of the city will block ground traffic, while the cover-and-excavation method can minimize construction Occupying an area without interrupting traffic, it greatly reduces the impact of subway construction on urban traffic operation and residents' lives. Therefore, it has been widely used in recent years. The cover-excavation reverse method is to excavate the ground down to a certain depth, then close the top, and the rest of the lower part of the construction is carried out under the closed roof, that is, excavate layer by laye...
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IPC IPC(8): E02D5/38E02D7/00E02D15/04E02D33/00
CPCE02D5/38E02D7/00E02D15/04E02D33/00
Inventor 汪阳廖令军刘昭张闯黄勇潘楚天
Owner THE 4TH ENG OF CHINA RAILWAY 5TH ENG GROUP
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