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Deep-layer one-time hole forming construction method through matching of blasting and rotary drilling rig

A technology of rotary drilling rigs and construction methods, which is applied in the direction of drilling equipment and methods, rotary drilling rigs, blasting, etc., and can solve the problems of high loss of drilling rigs and failure to meet construction progress requirements, and achieve high hole forming efficiency and lithology differences Larger, the effect of improving the construction progress

Inactive Publication Date: 2018-03-06
CCCC SECOND HARBOR ENG +1
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  • Claims
  • Application Information

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Problems solved by technology

Because the original design geological survey data show that the maximum natural compressive strength of the rock formation is 129.6Mpa, but the actual maximum compressive strength of the rock formation is as high as 330Mpa. After entering the site, the XCMG XR460D rotary drilling rig cannot meet the construction progress requirements on the one hand, and on the other hand, the drilling rig itself wears too much. Large, so the hole forming process of XCMG XR550D rotary drilling rig was replaced

Method used

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  • Deep-layer one-time hole forming construction method through matching of blasting and rotary drilling rig

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Embodiment

[0041] A background:

[0042] The blasting site is located at the bank of the Jinsha River on the east side of the hillside of Jin'an Township, Jin'an Township, Gucheng District, Lijiang City. Due to the construction of the national highway network G4216 Chengdu-Lijiang Expressway, cable towers need to be built at both ends of the Jin'an Jinsha River Bridge. The size is 28.8m*28.8m. There are 16 end-bearing piles with a diameter of 2.8m and a pile length of 65m under the cap, and 16 end-bearing piles with a diameter of 2.8m and a pile length of 45m. Due to the steep terrain and large height difference, the upper part of the friction pile is about 11m of tuff, and the lower part has to pass through 55m of moderately weathered and slightly weathered basalt. Except for some interlayers with slightly lower f coefficients, the rest of the f coefficients are between 15 and 35. During the period, the maximum compressive strength of the actual rock formation is as high as 330Mpa, the...

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Abstract

The invention discloses a deep-layer one-time hole forming construction method through matching of blasting and a rotary drilling rig. The deep-layer one-time hole forming construction method comprises the following steps that (1) coring is conducted on the center of a pile foundation to the pile bottom through the rotary drilling rig to form a free face; (2) a plurality of blastholes are drilledin the peripheral direction of concentric circles correspondingly through a down-the-hole hammer, and the depth of each blasthole is consistent with an empty hole; (3) the blastholes are charged withexplosives correspondingly in sequence, and an in-hole millisecond time-delay detonating cord priming system is used for detonation; and (4) after blasting, a drill bit of the rotary drilling rig is used for deslagging hole-flushing. According to the one-time hole forming construction method, the drilling defect of a traditional drilling rig in a high-strength rock region is overcome, meanwhile, the hole forming efficiency is high, and the construction progress is accelerated greatly.

Description

technical field [0001] The invention relates to the technical field of bridge pile foundation construction. More specifically, the present invention relates to a construction method for blasting combined with a rotary drilling rig to form a hole in a deep layer at one time. Background technique [0002] Because the Lijiang side pile foundation of the Jin’an Jinsha River Bridge is 65m long, the crevice water is relatively developed, and the water seepage is relatively large. There is a huge risk in manual digging. At the same time, the right side cap is relatively close to the slope, and it is easy to perforate during manual digging and blasting. Therefore, the pile foundation adopts mechanical drilling. Because the original design geological survey data show that the maximum natural compressive strength of the rock formation is 129.6Mpa, but the actual maximum compressive strength of the rock formation is as high as 330Mpa. After entering the site, the XCMG XR460D rotary dr...

Claims

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Application Information

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IPC IPC(8): E21B3/00E21B7/00F42D1/00F42D3/04
CPCE21B3/00E21B7/007F42D1/00F42D3/04
Inventor 王连彬舒大勇宋均枚龙左孝庆柯所安杨仁杰夏赞良党革顺吴位伦
Owner CCCC SECOND HARBOR ENG
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