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Underwater thick powder fine sand layer pore-forming expanding and stirring device and pore-forming method using same

A silt fine sand, hole-forming technology, applied in earthwork drilling, drilling equipment, infrastructure engineering, etc., can solve problems such as poor hole wall stability and over-limit sediment at the bottom of the hole, so as to reduce resistance and soil confining pressure Effect

Pending Publication Date: 2020-02-21
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the stability of the hole wall is poor when forming holes in the underwater thick silt and fine sand layer, and the sediment at the bottom of the hole is likely to exceed the limit, the present invention provides an underwater agitator for pore forming in the thick silt and fine sand layer and the expander using the expander. Agitator Hole Forming Method

Method used

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  • Underwater thick powder fine sand layer pore-forming expanding and stirring device and pore-forming method using same
  • Underwater thick powder fine sand layer pore-forming expanding and stirring device and pore-forming method using same
  • Underwater thick powder fine sand layer pore-forming expanding and stirring device and pore-forming method using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Such as Figure 1~6 As shown, a kind of expansion agitator for underwater thick silt and fine sand layer pore forming includes a pipe body, a drill bit 1, a cutting and stirring frame and a slurry delivery system, and the pipe body includes an outer pipe 2 and an inner pipe 3, and the outer pipe body includes an outer pipe 2 and an inner pipe 3. The pipe 2 is a steel pipe with an inner diameter of 20-40 cm, a wall thickness of 3-5 cm, and a length of 50-100 cm. The upper end of the outer pipe 2 is threadedly connected with a double-tube drill pipe with a core pipe. The helical blade 26, the lower part of the outer tube 2 is fitted with an inner tube 3, specifically, the inner wall of the outer tube 2 is provided with several guide grooves, and the outer wall of the inner tube 3 is provided with a protrusion 13 at the position corresponding to the guide groove, the guide groove and The protrusions 13 match and enable the outer tube 2 and the inner tube 3 to slide against...

Embodiment 2

[0079] The method of forming holes in thick silt and fine sand under diving conditions (the method of drilling a hole with a self-made retaining ring), including the following steps:

[0080] Step 1: According to the properties of the silty sand 22 and the thickness of the retaining ring 18 to be installed, calculate the size of the expansion and agitation range and the elevation of the top and bottom.

[0081] Step 2: Determine the size of the expander, including the height and diameter of the outer tube 2 and inner tube 3, the size of the cone tip angle of the drill bit 1 and the size of the cutting and stirring frame. Usually, when the cutting and stirring frame is closed, the diameter of the outer envelope circle of the expander is 1 / 3 to 2 / 3 of the drilling diameter to select the diameter of the inner tube 3 and the outer tube 2, and when the cutting and stirring frame is fully opened, the slurry outlet hole 12 The length of the upper cutting plate 4 and the lower cutting...

Embodiment 3

[0093] The method for forming holes in thick silt and fine sand under the condition of high-pressure water bearing (self-made slurry-soil retaining wall forming method), including the following steps:

[0094] Such as Figures 13 to 18 as shown,

[0095] The steps of this embodiment are basically the same as those in Embodiment 2, and the similarities will not be described in detail. The difference is:

[0096] In step 1, the initial elevation of expansion and stirring is selected above the lowest elevation that does not produce hole bottom inrush, and the inrush safety factor is taken as 1.05, that is, the pressure of wall retaining mud 23 in the hole and the top of silty sand layer 22 and the initial elevation of expansion and agitation The sum of the self-weight of the soil layers in between is greater than 1.05 times the pressure of the confined water head.

[0097] The helical blade 26 of the supporting drill pipe selected in step 3 is 20-50 cm smaller than the diameter...

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Abstract

The invention relates to an underwater thick powder fine sand layer pore-forming expanding and stirring device and a pore-forming method using the underwater thick powder fine sand layer pore-formingexpanding and stirring device. The expanding and stirring device comprises a pipe body, a drill, a cutting stirring frame and a slurry conveying system. The pipe body comprises an outer pipe and an inner pipe. The upper end of the outer pipe is detachably connected with a drill rod. Spiral blades are arranged on the outer wall of the drill rod and the outer wall of the outer pipe. The inner pipe is embedded to the lower portion of the outer pipe in a sleeving mode. The lower end of the inner pipe is detachably connected with the drill. The cutting stirring frame is arranged outside the pipe body in a circumferential array mode. The pore-forming method comprises the following steps of according to the properties and the thickness of a powder fine sand layer in a drilling range, determiningthe range of the expanding and stirring elevation and the thickness of a protecting wall, and then determining the size of the expanding and stirring device; and adopting the expanding and stirring device to carry out expanding and stirring, mixing slurry flowing out of the expanding and stirring device with soil, solidifying the mixture, conveying a powder fine mortar mixture modified in a drilled hole to the outside of the hole, and finally forming a hole. By using the expanding and stirring device and the pore-forming method, a slurry curing layer with a thickness of 5-20 cm is formed on the hole wall as a drilling hole wall protection ring to guarantee self-stabilization of the hole wall.

Description

technical field [0001] The invention belongs to the technical field of building construction, and in particular relates to an underwater stirrer for forming holes in thick silt and fine sand layers and a method for forming holes using the stirrer. Background technique [0002] The silt-fine sand layer has no bonding strength, and its self-stabilization is mainly based on the embedding and occlusion between soil particles. Therefore, the stability of the hole wall of the underwater silt fine sand layer drilling is poor, and it is easy to cause the sediment at the bottom of the hole to exceed the limit, and sometimes it becomes a waste hole. When the silty sand layer is rich in highly confined water, it is more difficult to form pores. During the construction of a project with equal-diameter long piles (more than 40m in length), high confined water (a confined water head of more than 7m) and thick silt and fine sand layers (the roof is about 15m from the ground, and the thick...

Claims

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Application Information

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IPC IPC(8): E21B10/32E21B10/44E21B10/60E21B33/138E02D5/46
CPCE02D5/46E21B10/32E21B10/44E21B10/60E21B33/138
Inventor 邹正盛郑清洁王新宇邹友峰王树仁顿志林秦莞臻王恒利
Owner HENAN POLYTECHNIC UNIV
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