CN217352434U - A whitewashing digs cuts structure for wet stirring stake construction drilling tool that spouts of major diameter - Google Patents

Abstract

The utility model relates to a structure is dug in whitewashing that is used for wet stirring stake construction drilling tool that spouts of major diameter, including drill bit center rod, the footpath of drill bit center rod is equipped with whitewashing in the footpath and digs the unit, whitewashing digs the unit and includes whitewashing passageway and digs the pterygoid lamina, digs the pterygoid lamina and fixes on the outer wall of drill bit center rod, whitewashing passageway one end and the drill bit center rod of whitewashing establish of whitewashing passageway communicate with each other, and whitewashing passageway is located the below of digging the pterygoid lamina and is parallel with the length direction who digs the pterygoid lamina, is provided with whitewashing through seam along whitewashing passageway axial direction; the utility model has the characteristics of along the even spreading curing agent thick liquid of pile body radius, effectively improve stirring pile body quality and construction efficiency, reduce the curing agent quantity etc, have simultaneously effectively to prevent characteristics such as whitewashing pipe jam, stifled easy clearance of managing.

Description

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

Technical Field

The utility model belongs to the technical field of underground construction machinery equipment, especially, relate to a structure is dug in whitewashing that is used for wet stirring stake construction drilling tool that spouts of major diameter.

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 engineering and construction field in the last 60 th century, including the fields of civil engineering, construction engineering, railway engineering, highway engineering, hydraulic engineering, municipal engineering, harbor 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.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the not enough of prior art existence, and provide a whitewashing digging structure that is used for wet stirring stake construction drilling tool that spouts of major diameter, can spread the curing agent thick liquid evenly in pile body radius in the work progress, in addition than the stirring disturbance that conventional stirring worker method stirring number of times still less, can be in order to realize the effect of stirring to realize that stirring stake pile body intensity difference dwindles by a wide margin and the bulk strength improves by a wide margin.

The utility model aims at accomplishing through following technical scheme, this kind of a spouting digs structure for wet stirring stake construction drilling tool that spouts of major diameter includes well core drill bit, well core drill bit's footpath upwards is equipped with the spouting and digs the unit, the spouting digs the unit and includes the spouting passageway and digs the pterygoid lamina, it fixes to dig the pterygoid lamina on well core drill bit's the outer wall, the one end of spouting passageway with well core drill bit is equipped with walks the thick liquid passageway and communicates with each other, just the spouting passageway is located dig the pterygoid lamina the below and with dig the length direction parallel of pterygoid lamina, follow be provided with the spouting through seam on the spouting passageway axial direction.

The utility model has the advantages that: 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, if unipolar one-way stirring stake, unipolar two-way stirring stake, biaxial one-way stirring stake, biaxial two-way stirring stake, multiaxis stirring stake and so on, all can be in the work progress through spouting the straight seam and evenly spread the curing agent thick liquid and spill in pile body radius scope, the stirring disturbance that the stirring number of times 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 intensity 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 amount, different guniting through seams are arranged, and meanwhile, through seam structural design can ensure that when local blockage occurs to the guniting through seams, the grout of the unblocked portion is washed to be unobstructed to the whole seam, so that the problem of blockage of a guniting opening is effectively avoided.

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

Preferably, the corresponding flow area of the slurry in the unit length of the slurry spraying through seam is increased along the axial direction of the slurry 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 drill bit central rod form an included angle theta 1, and the range of theta 1 is 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 theta 2 ranges from 0 degree to 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 the guniting and digging unit of the present invention.

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

Fig. 3 is a schematic view of the stirring drill according to 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 present invention.

Fig. 7 is an explosion structure diagram of an asymmetric guniting channel of the present invention.

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

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

Fig. 10 is a schematic diagram of the explosion structure of the symmetrical guniting channel of the present invention.

Fig. 11 is a schematic view of the symmetrical guniting through seam shape structure of the present invention.

Fig. 12 is a schematic diagram of the guniting passage and the guniting through seam position in several different structural forms 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 and communicating seams; 104. a shadow overlap region; 105. a grout stopping plug; 106. and cutting the plate tooth.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings: fig. 2 shows a stirring drill bit using the guniting-excavating unit 100 of the present invention, which includes a bit sub 3, a central drill bit rod 7, stirring blades 8, free blades 4, and the guniting-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 utility model has the advantages that: 1. the technical problem that the curing agent cannot be uniformly spread in the traditional mixing 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 excavating unit 100 is arranged in the radial direction of the central drill bit rod 7, the guniting and excavating unit 100 comprises a guniting channel 101 and excavating wings 102, the excavating wings 102 are fixed on the outer wall of the central drill bit rod 7, as shown in fig. 4, one end of the guniting channel 101 is communicated with a guniting channel 71 arranged on the central drill bit rod 7, the guniting channel 101 is positioned below the excavating wings 102 and is parallel to the length direction of the excavating wings 102, and the guniting channel 101 mainly functions to guide the curing agent grout flowing vertically in the guniting channel 101 to the transverse radial direction of the mixing pile so as to be spread in the radial range of the pile body. A guniting through slit 103 is provided along 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 passage 101 is formed by enclosing a half-section rectangular pipe and a lower plane of the digging wing plate, and a guniting through seam 103 is arranged at a 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 half-section circular pipe and an arc-shaped groove on the digging wing plate 102, and a guniting through seam 103 is arranged on the half-section circular pipe; as shown in fig. 12(d), a semicircular slurry spraying passage 101 is formed by a plane plate and an arc-shaped groove on the digging wing plate 102, and a slurry spraying through-slit 103 is provided on the plane plate.

The slurry feed slits 103 are 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 channel 101. Because each point in the length direction of the guniting and excavating unit 100 rotates around the central rod 7 of the drill bit, the linear velocity is different, in order to reach the aim 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 by arranging the guniting through seams 103 with the characteristics shown in the figure, the curing agent grout can be relatively uniformly distributed on the circumferences of all radii by utilizing the principle that the grout flowing out from different overflowing areas is different in amount and is in a certain proportion, so that the curing agent content of each point of the pile body is equal. According to the above purpose 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 trapezoid-shaped 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 gunning seams shown in fig. 11(a), the trapezoidal gunning seams shown in fig. 11(b), the string-shaped gunning seams shown in fig. 11(c), fig. 11(d) and fig. 11(e), and the irregular gunning seams shown in fig. 11(f) and fig. 11(g) are symmetrical gunning seams formed by directly opening holes in the side walls of the gunning passages.

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 passage 101 is provided with a detachable grout stopper 105. The outer ring of the grout stop plug 105 has a thread structure 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 and the cross section direction of the drill center rod 7 form an included angle θ 1, the range of θ 1 is 0 to 45 °, in this example, 20 °, which can generate a better shearing disturbance 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 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 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 slurry spraying through seams 103 continuously spray 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 soil body position where the slurry is mixed, 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 simultaneously, once stirring is carried out, so that the spraying-stirring construction is completed;

finally, closing the background slurry conveying, starting the 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; 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 change is made on the shape or material composition, and all the structural designs provided by the present invention are all the deformation of the present invention, which should be considered within the protection scope of the present invention.

Claims (9)

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

2. The shotcrete excavating structure for a large-diameter wet shotcrete pile construction drill according to 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 shotcrete excavating structure for a large-diameter wet shotcrete construction drill according to 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 shotcrete excavating structure for a large-diameter wet shotcrete pile construction drill according to claim 3, wherein: the corresponding slurry flow area of the guniting through seam (103) in unit length is increased along the axial direction of the guniting channel (101).

5. The shotcrete excavating structure for a large-diameter wet shotcrete pile construction drill according to claim 1, wherein: and a detachable grout stop 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 the theta 1 is 0-45 degrees.

7. The shotcrete excavating structure for a large-diameter wet shotcrete pile construction drill according to 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 shotcrete excavating structure for a large-diameter wet shotcrete pile construction drill as recited in 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).

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