CN114753359A

CN114753359A - A whitewashing digs and cuts structure for wet stirring stake construction drilling tool that spouts of major diameter

Info

Publication number: CN114753359A
Application number: CN202210505892.5A
Authority: CN
Inventors: 陈天雄; 刘钟; 杨宁晔; 张楚福
Original assignee: Zhejiang Kunde Innovate Geotechnical Engineering Co ltd
Current assignee: Zhejiang Kunde Innovate Geotechnical Engineering Co ltd
Priority date: 2022-05-10
Filing date: 2022-05-10
Publication date: 2022-07-15

Abstract

The invention relates to a guniting and excavating structure for a large-diameter wet-gunning and stirring pile construction drilling tool, which comprises a drill bit central rod, wherein a guniting and excavating unit is arranged in the radial direction of the drill bit central rod, the guniting and excavating unit comprises a guniting channel and excavating wing plates, the excavating wing plates are fixed on the outer wall of the drill bit central rod, one end of the guniting channel is communicated with a slurry walking channel arranged in the drill bit central rod, the guniting channel is positioned below the excavating wing plates and is parallel to the length direction of the excavating wing plates, and a guniting through seam is arranged in the axial direction of the guniting channel; the invention has the characteristics of uniformly spreading the curing agent slurry along the radius of the pile body, effectively improving the quality of the pile body of the mixing pile and the construction efficiency, reducing the consumption of the curing agent and the like, and simultaneously has the characteristics of effectively preventing the blockage of the guniting pipe, easily cleaning the blocked pipe and the like.

Description

A whitewashing digs and cuts structure for wet stirring stake construction drilling tool that spouts of major diameter

Technical Field

The invention belongs to the technical field of underground construction mechanical equipment, and particularly relates to a guniting and excavating structure for a large-diameter wet-gunning and mixing pile construction drilling tool.

Background

As a main construction method in the technical field of foundation treatment engineering, the deep mixing pile technology has been widely applied to the field of engineering and construction in the last 60 th century, including the fields of civil engineering, constructional engineering, railway engineering, highway engineering, hydraulic engineering, municipal engineering, port engineering and the like. The deep mixing pile engineering technology adopts a single-shaft or multi-shaft mixing drilling machine to input cement and other curing agents into the ground, and the curing agents and soft and hard soil bodies are mixed by stirring, so that a series of physical and chemical reactions are generated between the curing agents and the soil bodies, and pile bodies, wall bodies and block bodies with high strength, good water stability and strong seepage-proofing performance are generated. Therefore, the bearing capacity of the composite foundation, the bearing capacity of the mixing pile, the bearing capacity of the stiffening core composite pile, the bearing capacity of the pile in the SMW construction method, the impermeability of the waterproof wall, the actual engineering problems of the sealing wall and the sealing layer of the landfill site of polluted soil and toxic substances and the like are effectively solved.

The deep mixing pile engineering technology has the advantages of simple drilling machine equipment, high construction efficiency, low cost and the like, and is widely applied to the field of civil construction. However, when a drilling tool for constructing a mixing pile is designed at present, a slurry spraying port is arranged on a central rod of a drill bit for spraying slurry, and the slurry sprayed out is stirred by a stirring blade to be uniformly mixed with soil to form a mixing pile with a certain diameter, but the slurry around the central rod of the drill bit is difficult to achieve the aim of uniform stirring through stirring disturbance of the soil, so that the curing agent is usually discharged upwards along a gap between the drilling tool and the periphery of the drill rod, the curing agent is gathered in a partial area, particularly the central area, and finally serious engineering quality problems that the strength of peripheral cement soil is far lower than that of central cement soil, the overall strength of the curing soil is lower than a design value and the like are caused, and a serious engineering safety problem is often caused. When the engineering needs to adopt the stirring stake construction of major diameter, the major depth especially, when adopting the stirring drilling tool construction of conventional grout spraying mouth design, can make engineering quality and engineering safety risk especially show prominently. At present, the civil construction market urgently needs to solve the engineering technical problem, and the existing conventional solutions mainly comprise: 1. the spraying pressure is increased, the slurry is conveyed to the outer side of the pile body by utilizing jet flow, or the mixing amount of the slurry is increased, so that the chance of uniform stirring is increased, but the methods need to increase additional equipment or increase the material consumption, so that the construction cost is increased; 2. the four-stirring two-spraying or multi-stirring multi-spraying process is adopted to increase the stirring time, so that the uniformity is improved to a certain degree, but the construction efficiency is reduced; 3. the slurry spraying port is moved to the stirring blade, even in order to realize uniform slurry spraying within the radius range of the pile body, a plurality of slurry spraying holes are additionally arranged on the stirring blade or the digging blade, the defects of the slurry spraying design of the central rod are overcome, the improvement is achieved to a certain extent, but the slurry cannot be uniformly covered along the radius, or part of slurry outlet holes are blocked in the construction process. Therefore, the problem is not fundamentally solved in the industry.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and provides a guniting and excavating structure for a large-diameter wet guniting and stirring pile construction drilling tool, which can uniformly spread curing agent slurry in the radius range of a pile body in the construction process, and can realize the effect of uniform stirring by stirring disturbance with fewer stirring times compared with the conventional stirring method, thereby greatly reducing the difference of the pile body strength of a stirring pile and greatly improving the integral strength.

The invention aims to solve the technical scheme that the slurry spraying and digging structure for the large-diameter wet spraying and stirring pile construction drilling tool comprises a drill bit central rod, a slurry spraying and digging unit is arranged in the radial direction of the drill bit central rod and comprises a slurry spraying channel and a digging wing plate, the digging wing plate is fixed on the outer wall of the drill bit central rod, one end of the slurry spraying channel is communicated with a slurry walking channel arranged in the drill bit central rod, the slurry spraying channel is positioned below the digging wing plate and is parallel to the length direction of the digging wing plate, and a slurry spraying through seam is arranged in the axial direction of the slurry spraying channel.

The beneficial effects of the invention are as follows: compared with the prior art, through adopting this kind of structure, no matter what kind of stirring drill bit and what kind of stirring technology, like the one-way stirring stake of unipolar, the two-way stirring stake of unipolar, the one-way stirring stake of biax, the two-way stirring stake of biax, multiaxis stirring stake and so on, all can be in the work progress through spouting the crack with the curing agent thick liquid evenly spread in pile body radius range, the stirring disturbance that stirring frequency still less than conventional stirring worker method in addition, can be in order to realize the effect of stirring, thereby realize that stirring stake pile body strength difference reduces by a wide margin and bulk strength improves by a wide margin, utilize this structure can make the construction diameter of stirring stake reach 3000 mm.

Preferably, the guniting through seam is formed by surrounding a bottom plate surface of a digging wing plate and a notch arranged on the guniting channel, or is formed by opening a hole on the side wall of the guniting channel; according to the size of the guniting quantity, different guniting through seams are arranged, and meanwhile, through seam structural design can ensure that when the guniting through seams are partially blocked, the guniting opening is flushed to be smooth in the whole seam by depending on the grout of the unblocked portion, so that the problem of blockage of the guniting opening is effectively solved.

Preferably, the guniting through seam is arranged in a shadow overlapping area formed between a forward rotation soil facing surface and a reverse rotation soil facing surface of the guniting digging unit; can effectively prevent soil from entering the guniting channel and ensure smooth guniting.

Preferably, the corresponding flowing area of the grout in the unit length of the grout spraying through seam is increased along the axial direction of the grout spraying channel; the curing agent slurry can be relatively uniformly distributed on the circumferences of all radii through the structural arrangement, so that the curing agent content of all points of the stirring pile body is equal.

Preferably, a detachable grout stop plug is arranged on the axial end face of the other end of the grout spraying channel; greatly reducing the difficulty of cleaning the blocking pipe.

Preferably, the plate surface direction of the digging wing plate and the cross section direction of the central rod of the drill bit form an included angle theta 1, and the theta 1 is within the range of 0-45 degrees; can produce better shearing disturbance effect to the soil body in front of the upper plate in the rotating direction, and simultaneously reduce the increased resistance to the drill bit.

Preferably, a plurality of cutting plate teeth are fixed on the digging wing plate, and the cutting plate teeth are positioned on the side of the guniting through seam; the cutting speed of the soil body can be greatly improved, so that the construction efficiency is greatly improved, and meanwhile, the curing agent slurry sprayed from the slurry spraying seam can enter a soil body groove after the cutting teeth are dug, so that the slurry is prevented from flowing randomly, and the aim of uniform spraying is fulfilled.

Preferably, the cutting direction of the cutting plate teeth and the vertical plane direction of the length direction y of the digging wing plate form an included angle theta 2, and the range of theta 2 is 0-90 degrees; the covering surface of cutting disturbance is wider and more sufficient, and the cutting effect is better.

Preferably, the guniting and excavating unit is located at the lower end of the central drill bit rod, a drill bit joint is arranged at the upper end of the guniting and excavating unit, a stirring blade unit and a free blade are sequentially arranged on a rod body of the central drill bit rod from top to bottom, and the stirring blade unit and the free blade are located above the guniting and excavating unit; so that the stirring capacity of the whole drill bit is better.

Drawings

Fig. 1 is a schematic structural view of a guniting-excavating unit of the present invention.

Fig. 2 is a schematic view of the structure of the stirring drill bit of the present invention.

Fig. 3 is a front view of the stirring drill bit of the present invention.

Fig. 4 is a schematic view of the sectional structure a-a of fig. 3.

Fig. 5 is a schematic view of a sectional structure B-B of fig. 3.

Fig. 6 is a partial schematic view of an asymmetric guniting through seam structure of the invention.

Fig. 7 is a schematic diagram of an explosive structure of an asymmetric guniting channel of the invention.

Fig. 8 is a structural diagram of an asymmetric type guniting through seam shape of the invention.

Fig. 9 is a partial schematic view of a symmetrical guniting through seam structure of the present invention.

Fig. 10 is a schematic view of the explosive structure of the symmetrical guniting channel of the present invention.

Fig. 11 is a structural diagram of a symmetrical type guniting through seam shape of the present invention.

Fig. 12 is a schematic view of the location of the gunite passage and gunite through slot in several different configurations of the present invention.

The reference numbers in the drawings are respectively: 3. a bit sub; 4. a free blade; 7. a drill center rod; 8. a stirring blade unit; 71. a slurry channel; 100. a guniting and digging unit; 101. a guniting channel; 102. digging and cutting wing plates; 103. spraying slurry to pass through the seam; 104. a shadow overlap region; 105. a grout stopping plug; 106. and cutting the plate tooth.

Detailed Description

The invention will be described in detail below with reference to the following drawings: fig. 2 shows a stirring drill bit employing the gunite-excavating unit 100 of the present invention, which includes a bit sub 3, a central bit rod 7, stirring blades 8, free blades 4, and the gunite-excavating unit 100; the guniting and excavating unit 100 is located at the lower end of a center rod 7 of a drill bit, a drill bit joint 3 is arranged at the upper end of the guniting and excavating unit 100, a stirring blade unit 8 and a free blade 4 are sequentially arranged on a rod body of the center rod 7 of the drill bit from top to bottom, and the stirring blade unit 8 and the free blade 4 are located above the guniting and excavating unit 100. The invention has the beneficial effects that: 1. the technical problem that the curing agent cannot be uniformly spread in the traditional stirring pile construction is solved; 2. the problem that a part of the guniting ports are blocked due to porous guniting is solved; 3. the problem that large-particle impurities in the curing agent slurry cannot be discharged from a slurry spraying port to cause blockage of a slurry spraying channel is solved, and the failure rate in construction is greatly reduced; 4. the forward and reverse bidirectional anti-blocking design effectively prevents soil from flowing into the grout spraying port, the grout spraying port is always kept smooth, and the failure rate is further reduced; 5. the problem that the blockage of the guniting channel cannot be cleaned is solved, and parts or the whole drill bit do not need to be replaced; 6. the soil bodies and the curing agent are integrally stirred uniformly and fully mixed, so that a high-strength cured soil body can be formed; 7. under the condition that the solidified soil achieves the same integral strength, a large amount of curing agent materials can be saved; 8. the construction speed and the construction efficiency are greatly improved, and the construction period can be shortened; 9. ensures the excellent quality of the deep mixing pile, the engineering safety and the cost reduction.

As shown in fig. 1, a guniting and digging unit 100 is arranged in the radial direction of the central drill rod 7, the guniting and digging unit 100 comprises a guniting channel 101 and digging wings 102, the digging wings 102 are fixed on the outer wall of the central drill rod 7, as shown in fig. 4, one end of the guniting channel 101 is communicated with a slurry running channel 71 arranged on the central drill rod 7, the guniting channel 101 is positioned below the digging wings 102 and is parallel to the length direction of the digging wings 102, and the guniting channel 101 mainly functions to guide the curing agent slurry flowing vertically in the guniting channel 101 to the transverse radius direction of the mixing pile so as to be spread in the radius range of the pile body. A guniting through slit 103 is provided in the axial direction of the guniting passage 101, as shown in fig. 6 and 9. Based on the technical characteristics, the form of the guniting channel can be as follows: as shown in fig. 12(a), a semicircular guniting channel 101 is formed by a semi-section pipe and the lower plane of the digging wing plate, and a guniting through seam 103 is arranged at the position where the semi-section pipe is adjacent to the digging wing plate 102; as shown in fig. 12(b), a rectangular guniting channel 101 is formed by enclosing a half-section rectangular pipe and the lower plane of the digging wing plate, and a guniting through seam 103 is arranged at the position where the half-section rectangular pipe is adjacent to the digging wing plate 102; as shown in fig. 12(c), a circular guniting passage 101 is formed by a semi-section circular pipe and an arc-shaped groove on a digging wing plate 102, and a guniting through seam 103 is arranged on the semi-section circular pipe; as shown in fig. 12(d), a semicircular guniting passage 101 is formed by a flat plate and an arc-shaped groove on the digging wing plate 102, and a guniting through slit 103 is provided on the flat plate.

The slurry-ejecting through-slit 103 is arranged in a non-uniform width, and the corresponding slurry flow area per unit length thereof generally increases in the slurry flow direction in the slurry-ejecting passage 101. Because each point of the guniting and excavating unit 100 in the length direction rotates around the central rod 7 of the drill bit, the linear velocity is different, in order to reach the target that the mixing ratio of the curing agent at each position of the pile body is consistent, the amount of grout needed on the pile body close to the periphery is larger than that close to the inner ring in unit width, and the guniting through seams 103 with the characteristics of illustration are arranged, and the curing agent grout can be relatively uniformly distributed on the circumferences of all radiuses by utilizing the principle that the amounts of the grout flowing out of different overflowing areas are different and are in a certain proportion, so that the content of the curing agent at each point of the pile body is equal. According to the above-mentioned objects and technical features, the slurry-spraying through-slit 103 can be configured in different shapes, such as a step-shaped slurry-spraying through-slit shown in fig. 8(a), a trapezoidal slurry-spraying through-slit shown in fig. 8(b), a string-shaped slurry-spraying through-slit shown in fig. 8(c), 8(d) and 8(e), and an irregular-shaped slurry-spraying through-slit shown in fig. 8(f) and 8(g), which are all asymmetric slurry-spraying through-slits surrounded by the bottom plate surface of the digging wing plate and the notch on the slurry-spraying passage; the stepped gunite pass shown in fig. 11(a), the trapezoidal gunite pass shown in fig. 11(b), the string-shaped gunite pass shown in fig. 11(c), fig. 11(d) and fig. 11(e), and the irregular gunite pass shown in fig. 11(f) and fig. 11(g) are symmetrical gunite passes formed by directly forming holes in the side walls of the gunite passage.

The guniting through seams 103 are not arranged in equal width, and compared with the equal-width guniting through seams, the formed maximum seam width size range of the guniting cross section is larger under the condition that the total flow area is consistent, and the guniting through seams can be facilitated to be smooth through larger particle sizes.

The shotcrete through-slit 103 is provided in a shadow overlapping region 104 of the forward rotation earth-facing surface and the reverse rotation earth-facing surface of the shotcrete cutting structure 1, as shown in fig. 12 (a), (b), (c), and (d). When the drilling tool rotates forwards or reversely on the deep soil body, the soil-facing surface is extruded by the soil body, and the guniting through seam 103 is arranged in the shadow overlapping area 4-1 of the forward rotation soil-facing surface and the reverse rotation soil-facing surface of the guniting digging unit 100, so that the soil body can be effectively prevented from entering a guniting channel, and the guniting is ensured to be smooth.

As shown in fig. 7 and 10, the end of the guniting channel 101 is provided with a detachable grout stop plug 105. The outer ring of the grout stop plug 105 has a thread structure which is matched with the thread structure of the inner ring at the tail end of the guniting channel 101. When the guniting channel 101 is blocked due to the facts that particles in slurry are too large or hardening occurs because residual slurry is not cleared away in time, the slurry stop plug 105 can be detached through the tool, the blocking object can be discharged from a large hole at the tail end of the guniting channel 101, and the slurry stop plug 105 is installed back after the cleaning is finished, so that the difficulty in cleaning the blocked pipe is greatly reduced.

As shown in fig. 3, the plate surface direction of the digging wing plate 102 forms an included angle θ 1 with the cross section direction of the drill center rod 7, the range of θ 1 is 0 to 45 °, in this example, 20 °, which can generate a better shearing and disturbing effect on the soil mass in front of the plate in the rotation direction, and at the same time, the added resistance to the drill 20 is general.

As shown in fig. 5, a plurality of cutting plate teeth 106 are respectively fixed on the digging wing plate 102, the cutting direction of the cutting plate teeth 106 forms an included angle θ 2 with the vertical plane direction of the extending direction y of the digging wing plate 102, the range of θ 2 is 0-90 °, in this embodiment, from inside to outside along the y-axis direction, θ 2 of 4 cutting plate teeth 106 is continuously reduced, and is respectively 25 °, 20 °, 15 ° and 10 °.

The use method of the stirring drill bit with the guniting and excavating structure comprises the following process steps:

when the mixing pile machine starts to be constructed, the back stage of the drilling machine starts to supply curing agent slurry, the curing agent slurry flows into the slurry running channel 71 of the central rod 7 of the drill bit through a drill rod pipeline and further flows into the slurry spraying channel 101, and then the slurry is sprayed out through the slurry spraying through seam 103 of the drill bit, at this moment, the slurry is normally supplied, and all channels are not blocked, so that the next step can be carried out;

the drill bit starts to drill, the cutting plate teeth 106 firstly contact with the soil body to loosen the soil body, upward and forward component force is provided for the soil body in front of the plate under the action of the digging wing plates 102, further digging and disturbance of the soil body are realized, meanwhile, the guniting through seams 103 continuously spray the slurry, the curing agent slurry is uniformly spread in the cut soil body, when the stirring blade units 8 on the upper part reach the position of the soil body mixed with the slurry, the soil body containing the slurry is further stirred to be uniform, when the stirring drill bit drills to the elevation of the pile bottom, the pile body is uniformly mixed with the curing agent slurry, and meanwhile, the stirring construction of spraying and stirring is completed by one time;

Finally, closing the background slurry conveying, starting reverse rotation and lifting of the drill bit, stirring the cement soil of the pile body again, increasing the uniformity again, and completing one-spraying and two-stirring construction when the stirring drill bit is lifted to be away from the ground, wherein the construction is finished; if necessary, the steps can be repeated once to finish the construction of two-spraying and four-stirring; after the construction is finished, the background pumps clean water to flush out residual slurry or residues in the drill rod, the drill bit center rod and the guniting channel, if the residual slurry or the residues cannot be flushed out, the grout stopping plug can be detached, and the guniting channel is cleaned to be smooth again by using tools.

The present invention is not limited to the above embodiments, and any changes in the shape or material composition, or any changes in the structural design provided by the present invention, are all modifications of the present invention, and should be considered within the scope of the present invention.

Claims

1. The utility model provides a structure is dug in whitewashing that is used for wet spouting stirring stake construction drilling tool of major diameter, includes well core rod (7) of drill bit, its characterized in that: the radial direction of the drill bit central rod (7) is provided with a guniting and digging unit (100), the guniting and digging unit (100) comprises a guniting channel (101) and digging wing plates (102), the digging wing plates (102) are fixed on the outer wall of the drill bit central rod (7), one end of the guniting channel (101) is communicated with a slurry walking channel (71) arranged on the drill bit central rod (7), the guniting channel (101) is positioned below the digging wing plates (102) and is parallel to the length direction of the digging wing plates (102), and a guniting through seam (103) is arranged in the axial direction of the guniting channel (101).

2. The structure of claim 1, wherein: the guniting through seam (103) is formed by surrounding a bottom plate surface of a digging wing plate (102) and a notch arranged on the guniting channel (101), or the guniting through seam (103) is formed by opening a hole on the side wall of the guniting channel (101).

3. The structure of claim 1 or 2, wherein: the guniting through seam (103) is arranged in a shadow overlapping area (104) formed between the forward rotation soil facing surface and the reverse rotation soil facing surface of the guniting digging unit (100).

4. The structure of claim 3, wherein: the corresponding slurry flow area of the guniting through seam (103) in unit length is in an increasing trend along the axial direction of the guniting channel (101).

5. The structure of claim 1, wherein: and a detachable grout stopping plug (105) is arranged on the axial end face of the other end of the grout spraying channel (101).

6. The structure of claim 1, wherein: the plate surface direction of the digging wing plate (102) and the cross section direction of the drill bit central rod (7) form an included angle theta 1, and the range of theta 1 is 0-45 degrees.

7. The structure of claim 1, wherein: a plurality of cutting plate teeth (106) are fixed on the digging wing plate (102), and the cutting plate teeth (106) are positioned on the side of the guniting through seam (103).

8. The structure of claim 7, wherein: the cutting direction of the cutting plate teeth (106) and the vertical plane direction of the length direction y of the digging wing plate (102) form an included angle theta 2, and the range of theta 2 is 0-90 degrees.

9. The shotcrete excavating structure for a large-diameter wet shotcrete pile construction drill according to claim 1, wherein: the guniting and excavating unit (100) is located at the lower end of the drill bit center rod (7), a drill bit joint (3) is arranged at the upper end of the guniting and excavating unit (100), a stirring blade unit (8) and a free blade (4) are sequentially arranged on a rod body of the drill bit center rod (7) from top to bottom, and the stirring blade unit (8) and the free blade (4) are located above the guniting and excavating unit (100).