Construction method and drilling tool for variable cross-section bored cast-in-place pile (rock bolt)
A technology of bored piles and construction methods, which is applied in the direction of drill bits, sheet pile walls, drilling equipment, etc., can solve the problem that the resistance of pile foundation ends cannot be fully exerted, and achieve the effect of guaranteeing construction quality and improving bearing capacity
Inactive Publication Date: 2014-09-03
北京中阔地基基础技术有限公司
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Problems solved by technology
[0002] Ordinary bored pile technology has been widely used. Because it is a straight-hole pile with equal cross-section, the side resistance of the pile is mainly used, and the end resistance of the pile foundation cannot be fully utilized.
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[0025] Such as figure 1 , figure 2 , image 3 , Figure 4 As shown: the drill plate 15 of the variable cross-section helical drilling tool is placed under the lower connecting pipe 14, and the lower connecting pipe 14 is connected to the inner pipe 16 through the flat pin 13, and the outer surface of the lower connecting pipe 14 is provided with a helical blade 19. Bottom cover 17 and pressure side resistance sensor 21 are installed under 14, and three sets (or N sets) of lower rotary expansion arms 12 and upper rotary expansion arms 10 are respectively connected with lower connecting pipe 14 and upper connecting pipe 9 through pivot pin 11 . A helical blade 19 is installed on the outside of the upper connecting pipe, and is connected with the outer pipe 7 through a flat pin 13 again. The side of the outer tube 7 is provided with a spiral blade 19, the upper side of the outer tube 7 is provided with an external key 20 to connect with the power head 18, the upper part of t...
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Disclosed are a construction method of a variable cross-section bored cast-in-place pile (rock bolt) and a drilling tool thereof. The variable cross-section helical drilling tool comprises a drilling rig power head, an inner pipe, an outer pipe, a helical blade, a rotary expanding arm, a bottom cover, a sensor, a gate spool and the like. During work, the drilling rig power head rotates to drive the drilling tool to drill into a predetermined depth of the hole, and a concrete pump is started, so that concrete enters the space of the inner pipe. When a predetermined depth of an extension head is reached, the rotary expanding arm unfolds gradually, a drilling rig rotates in the original depth and performs cutting or grinding, and finally an enlarged cavity is formed. Then the rotary expanding arm is retracted, a height is lifted again, the above steps are repeated and concrete cast-in-place piles with a plurality of extension heads are formed. The method can also be used in the construction of rock bolt piles. The construction method can guarantee that no sediment exists in the bottom of holes, no slurry protection wall exists in work-yards and no vibration and no noise exists in construction processes, and the method is rapid, environment-friendly and capable of saving numerous concrete and improves the bearing capacity of pile foundations substantially.
Description
Technical field: [0001] The invention relates to a construction method of variable cross-section piles in building foundation pile engineering, in particular to a construction method of variable cross-section bored piles (anchor rods) integrated with surveying, drilling, reaming, pouring and testing. technical background: [0002] Ordinary bored pile technology has been widely used. Because it is a straight hole pile with equal cross-section, the side resistance of the pile is mainly exerted, and the end resistance of the pile foundation cannot be fully utilized. Multi-section Sancha extruded cast-in-situ pile (DX pile), which is a variable-section cast-in-situ pile, can exert the end resistance of each soil layer and greatly increase the bearing capacity. However, reaming is carried out after drilling in construction, and piles are formed after clearing the holes, lowering the cage, and pouring. The present invention is an auger drilling tool designed in which surveying, d...
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IPC IPC(8): E21B10/32E02D5/48E02D5/44E02D5/56
Inventor 贺德新
Owner 北京中阔地基基础技术有限公司