CN219508577U - Multi-nozzle high-pressure rotary spraying stirring curtain combined drill bit - Google Patents

Abstract

The utility model belongs to a drill bit, and aims to solve the problems that a triaxial mixer used in an underground seepage-proofing and soft foundation treatment method for cement mixing piles is large in size and difficult to enter; the high-pressure jet grouting method has the advantages that the slurry returning amount is large, the larger cement waste and the environment pollution are caused, and the problems of a sugar gourd-shaped or mushroom-shaped concretion body and the like are formed after piling. The stirring vane group comprises two first vanes and four second vanes, the length of the first vanes is smaller than that of the second vanes, the two second vanes close to the lower end of the drill rod are respectively provided with a first protection piece and a second protection piece, an installation through hole is formed between the first protection piece and the second protection piece, one end of the slurry pipe is connected with a high-pressure slurry source, the other end of the slurry pipe is respectively extended to the installation through hole, the outer end of the first protection piece and the outer end of the second protection piece to form three slurry outlets, and three spray heads are respectively installed at the positions of the three slurry outlets.

Description

Multi-nozzle high-pressure rotary spraying stirring curtain combined drill bit

Technical Field

The utility model belongs to a drill bit, and relates to a multi-nozzle high-pressure rotary spraying stirring curtain composite drill bit.

Background

The existing foundation pit, side slope, dam, building and structure can bring great potential safety hazard to engineering construction and later operation due to the problem of underground water leakage, and meanwhile, the influence of leakage on the surrounding environment and ecology cannot be ignored. In addition, in soft soil foundations, the soft soil foundations are low in strength, so that the foundation bearing capacity and stability often cannot meet engineering requirements, and foundation soil damage is easy to occur. The aim of foundation treatment is to reform and strengthen soft foundation soil, improve foundation soil performance, improve foundation bearing capacity, reduce foundation settlement and infiltration, and ensure that the foundation and the building built on the foundation maintain durability and safe usability.

However, the following problems remain in current underground barrier and soft foundation treatments:

(1) A cement mixing pile treatment method is commonly used in the construction of foundation pit seepage prevention engineering and soft foundation treatment engineering in soft soil areas. The method is suitable for the soil conditions of silt, mucky soil, silt, sand and the like, and a triaxial and six-axis stirrer can achieve better seepage prevention and soft foundation treatment effects at present. Because the equipment is large in size and high in support, the crane is often required to be matched for field assembly, and the mechanical approach requirement of the stirring pile cannot be met due to the limitation of field environment during construction, especially in mountain areas and hilly areas, the equipment is more difficult. In addition, the pile diameter formed by the equipment cannot be enlarged and is limited by the length of the stirring blade; when pile is spliced in close-packed mode, the original part of pile diameter is cut off by stirring blades, and the newly formed piles are spliced to form a later construction interface, so that seepage prevention is not facilitated.

(2) The high pressure jet grouting process includes drilling grouting pipe with nozzle to the soil layer with drilling machine, jetting slurry from the nozzle at 20-40MPa to form jet flow to impact and destroy the soil layer, stripping soil particles from the soil layer and mixing with slurry to form one solid after the slurry is solidified. The triple pipe high-pressure jet grouting method is widely applied to vertical infiltration interception projects of reservoirs and embankments at home and abroad, but has large slurry return quantity, and can cause larger cement waste and environmental pollution. In addition, because the jet grouting pile is influenced by the soil property of the foundation, uncontrollable sugar-gourd-shaped or mushroom-shaped concretions are often formed after pile forming, the bearing capacity and deformation of the treated foundation are influenced, and the engineering quality is further influenced.

Disclosure of Invention

The utility model aims to solve the problems of the existing underground seepage prevention and soft foundation treatment in the following two aspects: firstly, the stirring mechanical equipment in the multi-shaft cement stirring pile method has large size, the approach of narrow space and hilly and mountain land is difficult, and the construction interface is easy to form when pile is spliced, so that the seepage prevention is not facilitated; secondly, the high-pressure jet grouting method has large slurry returning amount, causes cement waste and environmental pollution, and often forms uncontrollable sugar-gourd-shaped or mushroom-shaped concretes after piling. Therefore, the multi-nozzle high-pressure jet grouting stirring curtain composite drill bit is provided, and the stirring jet grouting curtain pile and the vertical bearing pile with the variable diameters can be formed by using the drill bit, so that the design requirements and the field requirements can be met.

In order to achieve the above purpose, the utility model is realized by adopting the following technical scheme:

a multi-nozzle high-pressure rotary spraying stirring curtain composite drill bit comprises a drill rod and a stirring blade group; the device also comprises a pulp pipe and three spray heads;

the stirring blade group comprises two first blades and four second blades which are arranged on the drill rod; the two first blades are oppositely arranged to form a first blade group; each two second blades in the four second blades are oppositely arranged to form two second blade groups; the first blade groups are axially positioned between the two second blade groups along the drill rod, the first blade groups and the two second blade groups are staggered along the circumferential direction of the drill rod, and the length of the first blade is smaller than that of the second blade;

in the second blade group close to the lower end of the drill rod, the two second blades are respectively provided with a protection piece, the protection pieces are respectively marked as a first protection piece and a second protection piece, the inner end of the first protection piece is connected with the outer wall of the drill rod, the length of the first protection piece is smaller than that of the second protection piece, the inner end of the second protection piece is connected with the outer wall of the drill rod, and the outer end of the second protection piece is level with the outer end face of the second blade;

the drill rod is provided with a mounting through hole between the first protection piece and the second protection piece;

the drill rod is in a hollow column shape; one end of the slurry pipe is connected with an external high-pressure slurry source, and the other end of the slurry pipe extends from the inside of the drill pipe to the mounting through hole, the outer end of the first protecting piece and the outer end of the second protecting piece respectively to form three slurry outlets; the three spray heads are respectively arranged at the three slurry outlets.

Further, the first blade and the second blade are each inclined 15 ° to the bit rotational advancing direction.

Further, the projections of the axes of the first blades and the axes of the second blades on a projection plane are uniformly distributed along the circumferential direction;

the projection plane is a plane perpendicular to the axial direction of the drill rod.

Further, the drill rod also comprises a drill point arranged at the lower end of the drill rod.

Further, the pulp pipe comprises a first longitudinal part, a first transverse part, a second transverse part and a third transverse part which are communicated with each other;

the first longitudinal part is positioned in the drill rod, and the upper end of the first longitudinal part is connected with an external high-pressure slurry source;

the first transverse part, the second transverse part and the third transverse part are all arranged at the lower end of the first longitudinal part, the first transverse part is positioned in the first protection piece, the second transverse part is positioned in the second protection piece, and the third transverse part is positioned in the drill rod; the first transverse part and the third transverse part are mutually perpendicular;

the three spray heads are respectively arranged at the outer ends of the first transverse part, the second transverse part and the third transverse part.

Further, the first protection piece comprises a first protection cylinder and a first protection tube which are equal in length; the first protective cylinder is arranged on the second blade, the first protective tube is arranged in the first protective cylinder, and the inner ends of the first protective cylinder and the first protective tube are connected with the drill rod;

the second protection piece comprises a second protection cylinder and a second protection tube which are equal in length; the second protection cylinder is arranged on the second blade, the second protection tube is arranged in the second protection cylinder, and the inner ends of the second protection cylinder and the second protection tube are connected with the drill rod;

the first transverse part is positioned in the first protective tube, and the second transverse part is positioned in the second protective tube; the length of the first protection tube is smaller than that of the second protection tube.

Further, the spray nozzle arranged at the outer end of the first transverse part is positioned in the first transverse part, the spray nozzle arranged at the outer end of the second transverse part is positioned in the second transverse part, and the spray nozzle arranged at the outer end of the third transverse part is positioned in the third transverse part;

the diameter of the spray nozzle at the outer end of the first transverse part is equal to that of the spray nozzle at the outer end of the second transverse part, and the diameter of the spray nozzle at the outer end of the third transverse part is larger than that of the spray nozzle at the outer end of the first transverse part.

Further, the slurry pipe comprises a second longitudinal portion, a third longitudinal portion, a fourth transverse portion, a fifth transverse portion and a sixth transverse portion; the second longitudinal part, the fourth transverse part and the fifth transverse part are communicated with each other, and the third longitudinal part and the sixth transverse part are communicated with each other;

the second longitudinal part and the third longitudinal part are arranged in close proximity and are both positioned in the drill rod; the fourth transverse part and the fifth transverse part are mutually perpendicular and are both arranged at the lower end of the second longitudinal part; the fourth transverse part is positioned in the first protection piece, and the fifth transverse part is positioned in the drill rod; the sixth transverse part is arranged at the lower end of the third longitudinal part and is positioned in the second protection piece;

the three spray heads are respectively arranged at the outer ends of the fourth transverse part, the fifth transverse part and the sixth transverse part.

Further, the first protection piece comprises a first protection cylinder and a first protection tube which are equal in length; the first protective cylinder is arranged on the second blade, the first protective tube is arranged in the first protective cylinder, and the inner ends of the first protective cylinder and the first protective tube are connected with the drill rod;

the second protection piece comprises a second protection cylinder and a second protection tube which are equal in length; the second protection cylinder is arranged on the second blade, the second protection tube is arranged in the second protection cylinder, and the inner ends of the second protection cylinder and the second protection tube are connected with the drill rod;

the fourth transverse part is positioned in the first protection piece, and the sixth transverse part is positioned in the second protection piece; the length of the first protection tube is smaller than that of the second protection tube.

Further, the spray nozzle arranged at the outer end of the fourth transverse part is positioned in the fourth transverse part, the spray nozzle arranged at the outer end of the fifth transverse part is positioned in the fifth transverse part, and the spray nozzle arranged at the outer end of the sixth transverse part is positioned in the sixth transverse part;

the diameter of the spray nozzle at the outer end of the fourth transverse part is equal to that of the spray nozzle at the outer end of the sixth transverse part, and the diameter of the spray nozzle at the outer end of the fifth transverse part is larger than that of the spray nozzle at the outer end of the fourth transverse part.

Compared with the prior art, the utility model has the following beneficial effects:

1. the utility model provides a multi-nozzle high-pressure jet grouting stirring curtain composite drill bit, which is matched with a single-shaft stirring pile machine to provide power for the drill bit during construction, so that a construction mode of combining high-pressure jet grouting and stirring under mechanical stirring can be realized, and compared with a triaxial stirring machine, the multi-nozzle high-pressure jet grouting stirring curtain composite drill bit is smaller in size, and the field condition of construction equipment is easier to meet. In addition, from the aspect of the working principle, the utility model combines mechanical stirring and high-pressure spraying stirring, can firstly utilize high-pressure spraying flow to rotationally cut soil body, and then secondarily utilize slurry to repeatedly spray and stir to form a large-diameter consolidated body, thereby overcoming the defects of poor viscosity between piles, stirring piles and underground structures by a mechanical stirring method and difficulty in ensuring the diameter of a designed pile by a spraying grouting method. In the drill bit, the length of the first blade is smaller than that of the second blade, and the spray heads are arranged at the lower end of the drill rod and on the second blade group positioned below the drill rod, so that the first blade group of the drill bit is mechanically stirred, the spray heads are used for spraying and stirring, grouting is sprayed through the spray heads, and the bonding among piles, the stirring piles and underground structures can be more compact. The utility model combines mechanical stirring and high-pressure jet stirring, which can greatly reduce the energy required by cutting and expand the diameter of the pile. Furthermore, the three spray heads are different in distance from the central shaft of the drill rod, so that slurry can be more uniform during rotary spraying.

2. According to the utility model, the first blades and the second blades are both provided with the inclination angles, so that soil can be fully crushed, slurry is utilized to enter the crushed soil, and stirring is more uniform. The first blades and the second blades are combined to be uniformly distributed along the circumferential direction, so that the drill bit can achieve the stirring effect of being more uniform and higher in cutting energy.

3. According to the utility model, the drill tip is arranged at the lower end of the drill rod, so that the drill is more beneficial to pushing the drill to the direction below the ground.

4. The utility model provides two preferable slurry pipe structures, which can split the slurry entering from the outside into a single pipe or a double pipe, provide more possibilities for the processing and manufacturing of the drill bit of the utility model, and can be suitable for more construction environments.

5. The nozzle of the spray head is positioned in the protection pipe, so that the abrasion of the nozzle of the spray head during the rotary spraying operation can be avoided.

Drawings

For a clearer description of the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic view of the structure of the first embodiment (slurry pipe is not shown);

fig. 2 is a schematic view of the structure of fig. 1 (slurry pipe is not shown) rotated 180 ° clockwise about the axis of the drill pipe;

FIG. 3 is an exploded view of a second blade set, drill tip, first protector and second protector of FIG. 1;

FIG. 4 is a schematic view of a slurry pipe according to the first embodiment;

FIG. 5 is a schematic view of a slurry pipe structure according to a second embodiment;

FIG. 6 is a schematic view of the structure of FIG. 1 after 45 degrees of clockwise rotation about the axis of the drill pipe;

FIG. 7 is a schematic view of the structure of FIG. 1 rotated 45 counter-clockwise about the axis of the drill pipe;

FIG. 8 is a top view of the second embodiment (the other structure of the slurry removal pipe is the same as that of FIG. 6);

fig. 9 is a top view of fig. 6.

Wherein: 1-drill pipe, 201-first blade, 202-second blade, 3-pulp pipe, 301-first longitudinal section, 302-first transverse section, 303-second transverse section, 304-third transverse section, 305-second longitudinal section, 306-third longitudinal section, 307-fourth transverse section, 308-fifth transverse section, 309-sixth transverse section, 401-first protector, 4011-first protector, 4012-first protector, 402-second protector, 4021-second protector, 4022-second protector, 5-shower nozzle, 6-mounting through hole, 7-drill point, 8-threaded joint.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the embodiments of the present utility model, it should be noted that, if the terms "upper," "lower," "horizontal," "inner," and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or the azimuth or the positional relationship in which the inventive product is conventionally put in use, it is merely for convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the term "horizontal" if present does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the embodiments of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The utility model provides a multi-nozzle high-pressure rotary spraying stirring curtain composite drill bit, which comprises a drill rod 1 and a stirring blade group, wherein the stirring blade group is structurally designed. If the drill is provided with an underwater drill, clean water is sprayed through the three spray heads 5 while stirring during the drilling, and slurry is sprayed through the three spray heads while stirring during the lifting of the drill bit. Through practical engineering verification, the multi-nozzle high-pressure rotary spraying stirring curtain composite drill bit designed by the utility model can expand the diameter of a pile body from the conventional stirring diameter of 800mm to 1400mm, can meet the requirements of water isolation in the construction of a diaphragm wall in civil engineering, can also meet the requirements of high bearing capacity and low deformation in foundation treatment, can greatly reduce the number of piles to be distributed, and improves the efficacy.

The utility model will be described in detail below by means of some preferred embodiments of the utility model in connection with the accompanying drawings. For convenience of description, in the present utility model, a direction close to the foundation soil is defined as "down", a direction away from the foundation soil is defined as "up", an end close to the drill rod 1 is defined as "in", and an end away from the drill rod 1 is defined as "out" when the drill bit is operated.

Example 1

As shown in fig. 1 to 4, and fig. 6, 7 and 9, a multi-nozzle high-pressure rotary-jet stirring curtain composite drill bit comprises a drill rod 1, a stirring blade set, a slurry pipe 3 and three nozzles 5.

The stirring blade set comprises two first blades 201 and four second blades 202 mounted on the drill rod 1. Wherein two first blades 201 are oppositely arranged to form a first blade group. Among the four second blades 202, every two second blades 202 set up relatively, form two second blade groups, install three group's blade group altogether on the drilling rod 1, along the axial of drilling rod 1, first blade group is located between two second blade groups, and the length of first blade 201 is less than second blade 202, form the first blade group weak point in the middle on drilling rod 1, the stirring blade group structural style of second blade group length of being located top and below, can ensure that the pile body inside that forms all reaches the purpose of stirring. The first blade groups and the two second blade groups are uniformly staggered along the circumferential direction of the drill rod 1 when seen from the upper end of the drill bit, do not overlap, specifically, take a plane perpendicular to the axial direction of the drill rod 1 as a projection plane, and uniformly arrange the projections of the axes of the first blades 201 and the axes of the second blades 202 on the projection plane along the circumferential direction. In order to facilitate the stirring and the pushing, the first blade 201 and the second blade 202 are inclined by 15 ° in the direction of the drill rotation, and the drill tip 7 is welded to the end face of the lower end of the drill rod 1, and in the first embodiment, the drill tip 7 is a triangular plate type drill tip.

As shown in fig. 3 and 6, in the second blade group near the lower end of the drill rod 1, the upper surfaces of the two second blades 202 are respectively provided with a protecting member, one is marked as a first protecting member 401, the other is marked as a second protecting member 402, the inner end of the first protecting member 401 and the inner end of the second protecting member 402 are both fixed on the outer wall of the drill rod 1, the first protecting member 401 and the second protecting member 402 are respectively in a hollow semi-cylindrical shape, the length of the first protecting member 401 is smaller than that of the second protecting member 402, the first protecting member 401 is shorter, the outer end is positioned in the length range of the upper surface of the second blade 202, the second protecting member 402 is longer, and the outer end is flush with the outer end face of the second blade 202.

In addition, the drill rod 1 is in a hollow column shape, and three spray heads 5 are arranged on the drill bit. The installation through hole 6 is formed in the drill rod 1 and located between the first protection piece 401 and the second protection piece 402, one end of the slurry pipe 3 is connected with an external high-pressure slurry source, the other end of the slurry pipe extends to the installation through hole 6, the outer end of the first protection piece 401 and the outer end of the second protection piece 402 from the inside of the drill rod 1 respectively to form three slurry outlets, three spray heads 5 are respectively arranged at the three slurry outlets, the spray heads 5 can be arranged at the slurry outlets in a threaded sealing connection mode, and slurry at the external high-pressure slurry source is conveyed to the three spray heads 5. As a preferable scheme, the spray head 5 can be a round table-shaped alloy spray head, and the diameter of one end of the spray nozzle is larger.

As shown in fig. 4, the pulp pipe 3 has a specific structure in which the pulp pipe 3 includes a first longitudinal portion 301, a first lateral portion 302, a second lateral portion 303, and a third lateral portion 304 that are communicated with each other. The first vertical portion 301 is located in the drill rod 1, the upper end of the first vertical portion 301 is connected with an external high-pressure slurry source, the first horizontal portion 302, the second horizontal portion 303 and the third horizontal portion 304 are all installed at the lower end of the first vertical portion 301, the first horizontal portion 302 is located in the first protection piece 401, the second horizontal portion 303 is located in the second protection piece 402, the length of the first horizontal portion 302 is smaller than that of the second horizontal portion 303, and the three spray heads 5 are installed at the outer ends of the first horizontal portion 302, the outer ends of the second horizontal portion 303 and the outer ends of the third horizontal portion 304 respectively. A third transverse portion 304 is located in the drill rod 1, the third transverse portion 304 being short and guiding the slurry in the first longitudinal portion 301 transversely and to the nozzle 5 mounted on the mounting through hole 6. The first lateral portion 302 and the third lateral portion 304 are perpendicular to each other. The nozzle diameters of the three spray heads 5 are not identical, the nozzle diameter of the spray head 5 positioned at the outer end of the first transverse part 302 is phi 2.2mm, the nozzle diameter of the spray head 5 positioned at the outer end of the second transverse part 303 is phi 2.2mm, the nozzle diameter of the spray head 5 positioned at the outer end of the third transverse part 304 is phi 2.4mm, and the arrangement of the nozzle diameters is beneficial to the sufficiency of slurry in the length range of the stirring vane set and the larger diameter expansion range of the peripheral rotary spraying of the stirring vane set.

The structural forms of the first protector 401 and the second protector 402 may be various as long as the first lateral part 302 and the second lateral part 303 can be protected without affecting the injection of the slurry by the corresponding nozzle 5. As shown in fig. 3, in the first embodiment, a preferred first protector 401 and a second protector 402 are provided, and the first protector 401 and the second protector 402 have similar structures. Specifically, the first protection component 401 includes a first protection tube 4011 and a first protection tube 4012 that have equal lengths, the first protection tube 4011 is hollow semi-cylindrical, the first protection tube 4012 is hollow semi-cylindrical, the first protection tube 4011 is installed on the upper surface of the second blade 202, a welded connection mode can be adopted, the first protection tube 4012 is sleeved and installed in the first protection tube 4011, the inner ends of the first protection tube 4011 and the first protection tube 4012 are connected with the drill rod 1, and the outer ends of the first protection tube 4011 and the first protection tube 4012 are flush. The second protector 402 includes a second protective tube 4021 and a second protective tube 4022 which have equal lengths, the second protective tube 4021 is mounted on the second blade 202, the second protective tube 4022 is mounted in the second protective tube 4021, inner ends of the second protective tube 4021 and the second protective tube 4022 are connected with the drill rod 1, and outer ends of the second protective tube 4021 and the second protective tube 4022 are flush. The first lateral part 302 is located in the first protection tube 4012, the second lateral part 303 is located in the second protection tube 4022, and accordingly protection is achieved, and the length of the first protection tube 4012 is smaller than that of the second protection tube 4022. In addition, in order to better protect the spray head 5, the spray nozzles of the spray head 5 may be disposed in the corresponding lateral portions, so that the spray nozzles do not extend out of the corresponding lateral portions, so that the spray nozzles of the spray head 5 are worn during the spin spraying operation, the spray head 5 spray nozzle mounted at the outer end of the first lateral portion 302 is disposed in the first lateral portion 302, the spray head 5 spray nozzle mounted at the outer end of the second lateral portion 303 is disposed in the second lateral portion 303, and the spray head 5 spray nozzle mounted at the outer end of the third lateral portion 304 is disposed in the third lateral portion 304.

In the utility model, the combination of the setting positions of the three spray heads 5 can ensure the quality of the curing agent such as cement slurry and the like and the soil mass, the expanding injection quality and the quality of the expanding part and the stirring part. Furthermore, the arrangement of the spray head 5 is matched with the pressure arrangement of the spray head 5, a waterproof curtain with good continuity can be formed during rotary spraying, and meanwhile, the vertical bearing capacity can be improved, and the requirements of engineering on two aspects of transverse water stopping and vertical bearing can be met. The spray head 5 is arranged on the drill rod 1 and the second blade 202, high-pressure slurry is sprayed while stirring, so that the diameter expansion and stirring are simultaneously carried out, soil around the expanded slurry is cut to form cement soil (stone), and during stirring, slurry is sprayed in the stirring range simultaneously, so that the slurry and the soil in the stirring range of the first blade 201 and the second blade 202 can be ensured to be fully mixed.

Example two

As shown in fig. 5 and 8, the second embodiment is different from the first embodiment in that the specific structure of the slurry pipe 3 in the second embodiment is different. Specifically, in the second embodiment, the slurry pipe 3 includes the second longitudinal portion 305, the third longitudinal portion 306, the fourth transverse portion 307, the fifth transverse portion 308, and the sixth transverse portion 309, wherein the second longitudinal portion 305, the fourth transverse portion 307, and the fifth transverse portion 308 are in communication with each other, and the third longitudinal portion 306 and the sixth transverse portion 309 are in communication with each other. The second longitudinal portion 305 and the third longitudinal portion 306 are disposed in close proximity and are both located in the drill rod 1, so that the outer wall of the second longitudinal portion 305 and the outer wall of the third longitudinal portion 306 can be connected, and the axis of the second longitudinal portion 305, the axis of the third longitudinal portion 306 and the axis of the drill rod 1 are parallel to each other. The fourth transverse portion 307 and the fifth transverse portion 308 are perpendicular to each other and are both mounted at the lower end of the second longitudinal portion 305, the fourth transverse portion 307 is located in the first protection member 401, the fifth transverse portion 308 is located in the drill rod 1, the sixth transverse portion 309 is mounted at the lower end of the third longitudinal portion 306, and the sixth transverse portion 309 is located in the second protection member 402. Three spray heads 5 are mounted at the outer ends of the fourth transverse portion 307, the fifth transverse portion 308 and the sixth transverse portion 309, respectively. Also, in order to provide a better protection effect on the head 5, the head 5 nozzle mounted at the outer end of the fourth transverse portion 307 is located in the fourth transverse portion 307, the head 5 nozzle mounted at the outer end of the fifth transverse portion 308 is located in the fifth transverse portion 308, and the head 5 nozzle mounted at the outer end of the sixth transverse portion 309 is located in the sixth transverse portion 309. The nozzle diameters of the three spray heads 5 are not identical, the nozzle diameter of the spray head 5 positioned at the outer end of the fourth transverse part 307 is phi 2.2mm, the nozzle diameter of the spray head 5 positioned at the outer end of the sixth transverse part 309 is phi 2.2mm, the nozzle diameter of the spray head 5 positioned at the outer end of the fifth transverse part 308 is phi 2.4mm, and the arrangement of the nozzle diameters is also beneficial to the sufficiency of slurry in the length range of the stirring vane set, and the expanding range of the stirring vane set is larger when the periphery of the stirring vane set is rotated for spraying.

Regarding the specific structure of the first protector 401 and the second protector 402, the second embodiment and the first embodiment adopt the same structural form, and accordingly, the fourth transverse portion 307 is located in the first protector 401, and the sixth transverse portion 309 is located in the second protector 402.

Example III

The difference between the third embodiment and the first embodiment is that the structures of the first protection member 401 and the second protection member 402 in the third embodiment are different, and the first protection member 401 and the second protection member 402 adopt different structural forms, specifically, may adopt other protection members, and do not adopt a form of matching two parts of the protection tube and the protection tube, but adopts one other protective structure.

Similarly, in the second embodiment, the structures of the first protection member 401 and the second protection member 402 may be adjusted to form a new embodiment.

Example IV

The fourth embodiment differs from the first embodiment in that the specific shape of the drill tip 7 in the fourth embodiment is different, and any other existing shape of the drill tip 7 is adopted as long as the function of assisting the rotation and the pushing can be achieved.

Similarly, the specific shape of the drill tip 7 can also be adjusted to form a new embodiment corresponding to the second embodiment.

Example five

The fifth embodiment differs from the first embodiment in that the angles of inclination of the first blade 201 and the second blade 202 in the fifth embodiment are different, and as other preferred embodiments, the first blade 201 and the second blade 202 may even be inclined in different directions, or may also adopt different angles of inclination, and may be adjusted according to the foundation soil condition, the operation requirement, and the like during the construction operation.

Similarly, in the second embodiment, the inclined angles of the first blade 201 and the second blade 202 may be adjusted to form a new embodiment.

Example six

The difference between the sixth embodiment and the first embodiment is that the projection of the axis of each first blade 201 and the axis of each second blade 202 on the projection plane in the sixth embodiment does not adopt a circumferentially uniform arrangement manner, so long as the first and second blades are staggered and do not overlap each other.

Similarly, in the second embodiment, the projection arrangement manner of the axis of each first blade 201 and the axis of each second blade 202 on the projection plane may be adjusted to form a new embodiment.

The first to sixth embodiments are only some preferred embodiments of the present utility model, and in other embodiments of the present utility model, a new embodiment may be formed by adjusting the specific structure of the slurry pipe 3, etc., so long as an external high-pressure slurry source can be delivered to the three nozzles 5.

The construction operation with the underwater drill is carried out by adopting the drill bit, and the specific steps are as follows:

step one, a central axis is put:

the center axis of the jet grouting pile is positioned at the upstream side of the dam and is 1.5m away from the axis of the dam.

Step two, laying fixed marked lines:

and fixing marked lines are arranged in parallel along the two sides of the central axis of the jet grouting pile.

And thirdly, paying off.

And step four, positioning a drilling machine, and performing construction. The construction adopts a jump construction method, namely: and sequentially numbering all the piles to be constructed according to design requirements, and constructing according to the numbers 1,3 and 5.

And fifthly, measuring the level of the construction machinery platform by adopting a level bar, and leveling to ensure that the drilling tool is vertical to the construction ground.

And step six, measuring the vertical height of the drilling tool.

Seventh, high-pressure clean underwater drilling is conducted:

the descending speed of the drill bit is 30-50 cm/min, the rotating speed is 25-30 r/min, the clean water pressure is more than or equal to 25MPa, the nozzle diameter of the three spray heads 5 is phi 2.2-2.4 mm, the diameter of the drill rod 1 is phi 600mm, and the predicted pore-forming diameter is more than or equal to 900 mm.

And step eight, returning mud for cleaning.

Step nine, piling high-pressure cement paste:

when the drill bit is used for construction, the rotary spraying lifting speed of the drill bit is 20-25 cm/min, and the rotating speed is 20-25 r/min; the grouting pressure of the cement slurry is more than or equal to 30MPa, the diameter of the nozzles of the three spray heads 5 is phi 2.2-2.4 mm, the water-cement ratio of the cement slurry is 1:1.5, the specific gravity is 1.25-1.35, and the cement consumption is 200-210 kg/m.

And step ten, carrying out two-sequence hole construction by adopting the same method.

Corresponding to different specific construction conditions, the method can also be executed according to the following requirements:

the sinking drilling and grouting construction meets the following requirements:

1. positioning the single-shaft stirring pile machine to finish leveling;

2. driving the drill bit to sink into a foundation soil layer, starting a high-pressure cement slurry pump (communicated with a high-pressure cement slurry source) when the drill bit reaches 0.50m above the designed pile top elevation, respectively supplying high-pressure cement slurry to three spray heads 5, drilling the drill bit while spraying and stirring, and closing the high-pressure cement slurry source until the designed depth is reached;

3. while the first blade 201 and the second blade 202 are continuously stirred, the drill rod 1 is lifted until the high-pressure cement slurry source is started again at the height required by repeated spraying and stirring, and the high-pressure cement slurry pump is closed after the drill bit is lifted to be 0.50m above the designed cement pile height.

And (II) the drilling and spraying construction meets the following requirements:

1. driving a single-shaft stirring pile machine to enable the drill bit to sink into a foundation soil layer to a designed reinforcement depth;

2. starting a high-pressure cement slurry source at the pile bottom elevation, respectively supplying high-pressure cement slurry to the three spray heads 5, continuously spraying slurry and stirring for 30 seconds, and starting spraying slurry, stirring and lifting the drill bit;

3. lifting to 0.50m above the designed pile top elevation, re-spraying and re-stirring the upper part of the pile body, and closing the high-pressure cement slurry pump.

And (III) the construction of the tubular pile meets the following requirements:

1. the drill bit is adopted for tubular pile construction, and a sinking drilling and spraying mode is adopted generally preferentially;

2. when the driving drill sinks to 0.50m above the designed pile top elevation, starting a high-pressure cement slurry source to supply high-pressure cement slurry to each spray nozzle 5, drilling while spraying and stirring, and closing a high-pressure cement slurry pump until the designed depth is reached;

3. stirring while lifting, starting the high-pressure cement slurry pump until the height of the repeated spraying and stirring is required, and closing the high-pressure cement slurry pump after the drill bit is lifted to be 0.50m above the designed pile top height.

4. When the two ends of the pile are sealed, measures of reducing the lifting speed or increasing the cement slurry mixing amount can be adopted, and the sealing height is not suitable to be less than 1 time of the pile diameter.

By adopting the composite drill bit for construction, the soil body can be cut by utilizing the high-pressure clear water jet flow in a rotating way, and then the slurry is repeatedly sprayed and stirred for the second time, so that the large-diameter consolidated pile is formed. The deep stirring method and the high-pressure spraying method are combined, so that the defects that the adhesion between the stirring pile and the underground structure is poor in the mechanical stirring method and the designed pile diameter is difficult to ensure in the spraying grouting method are overcome.

The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (10)

1. A multi-nozzle high-pressure rotary spraying stirring curtain composite drill bit comprises a drill rod (1) and a stirring blade group; the method is characterized in that: the device also comprises a pulp pipe (3) and three spray heads (5);

the stirring blade group comprises two first blades (201) and four second blades (202) which are arranged on the drill rod (1); the two first blades (201) are oppositely arranged to form a first blade group; of the four second blades (202), every two second blades (202) are oppositely arranged to form two second blade groups; the first blade groups are axially positioned between the two second blade groups along the drill rod (1), the first blade groups and the two second blade groups are circumferentially staggered along the drill rod (1), and the length of the first blades (201) is smaller than that of the second blades (202);

in the second blade group close to the lower end of the drill rod (1), two second blades (202) are respectively provided with a protection piece, the protection pieces are respectively marked as a first protection piece (401) and a second protection piece (402), the inner end of the second protection piece (402) is connected with the outer wall of the drill rod (1), the outer end of the second protection piece is level with the outer end face of the second blade (202), the inner end of the first protection piece (401) is connected with the outer wall of the drill rod (1), and the length of the first protection piece (401) is smaller than that of the second protection piece (402);

a mounting through hole (6) is formed in the drill rod (1) and located between the first protection piece (401) and the second protection piece (402);

the drill rod (1) is in a hollow column shape; one end of the slurry pipe (3) is connected with an external high-pressure slurry source, and the other end of the slurry pipe extends from the inside of the drill pipe (1) to the mounting through hole (6), the outer end of the first protection piece (401) and the outer end of the second protection piece (402) respectively to form three slurry outlets; the three spray heads (5) are respectively arranged at three slurry outlets.

2. The multi-nozzle high-pressure rotary-jet stirring curtain composite drill bit according to claim 1, wherein: the first blade (201) and the second blade (202) are inclined by 15 DEG to the rotary advancing direction of the drill bit.

3. The multi-nozzle high-pressure rotary-jet stirring curtain composite drill bit according to claim 2, wherein: the projection of the axis of each first blade (201) and the axis of each second blade (202) on a projection plane is uniformly distributed along the circumferential direction;

the projection plane is a plane perpendicular to the axial direction of the drill rod (1).

4. A multi-jet high pressure rotary jet mixing curtain composite drill bit as defined in claim 3, wherein: the drill rod also comprises a drill point (7) arranged at the lower end of the drill rod (1).

5. The multi-nozzle high-pressure jet-grouting stirring curtain composite drill bit according to any one of claims 1 to 4, wherein: the slurry pipe (3) comprises a first longitudinal part (301), a first transverse part (302), a second transverse part (303) and a third transverse part (304) which are communicated with each other;

the first longitudinal part (301) is positioned in the drill rod (1), and the upper end of the first longitudinal part (301) is connected with an external high-pressure slurry source;

the first transverse part (302), the second transverse part (303) and the third transverse part (304) are all arranged at the lower end of the first longitudinal part (301), the first transverse part (302) is positioned in the first protection piece (401), the second transverse part (303) is positioned in the second protection piece (402), and the third transverse part (304) is positioned in the drill rod (1); the first transverse part (302) and the third transverse part (304) are mutually perpendicular;

the three spray heads (5) are respectively arranged at the outer ends of the first transverse part (302), the second transverse part (303) and the third transverse part (304).

6. The multi-nozzle high-pressure rotary-jet stirring curtain composite drill bit as recited in claim 5, wherein:

the first protection piece (401) comprises a first protection cylinder (4011) and a first protection tube (4012) which are equal in length; the first protection cylinder (4011) is arranged on the second blade (202), the first protection tube (4012) is arranged in the first protection cylinder (4011), and the inner ends of the first protection cylinder (4011) and the first protection tube (4012) are connected with the drill rod (1);

the second protector (402) comprises a second protection cylinder (4021) and a second protection tube (4022) which are equal in length; the second protection cylinder (4021) is arranged on the second blade (202), the second protection tube (4022) is arranged in the second protection cylinder (4021), and the inner ends of the second protection cylinder (4021) and the second protection tube (4022) are connected with the drill rod (1);

the first transverse part (302) is positioned in the first protective tube (4012), and the second transverse part (303) is positioned in the second protective tube (4022); the length of the first protection tube (4012) is smaller than the length of the second protection tube (4022).

7. The multi-nozzle high-pressure rotary-jet stirring curtain composite drill bit as recited in claim 6, wherein: the spray head (5) spray nozzle arranged at the outer end of the first transverse part (302) is positioned in the first transverse part (302), the spray head (5) spray nozzle arranged at the outer end of the second transverse part (303) is positioned in the second transverse part (303), and the spray head (5) spray nozzle arranged at the outer end of the third transverse part (304) is positioned in the third transverse part (304);

the nozzle diameter of the nozzle (5) at the outer end of the first transverse part (302) is equal to the nozzle diameter of the nozzle (5) at the outer end of the second transverse part (303), and the nozzle diameter of the nozzle (5) at the outer end of the third transverse part (304) is larger than the nozzle diameter of the nozzle (5) at the outer end of the first transverse part (302).

8. The multi-nozzle high-pressure jet-grouting stirring curtain composite drill bit according to any one of claims 1 to 4, wherein: the pulp pipe (3) comprises a second longitudinal section (305), a third longitudinal section (306), a fourth transverse section (307), a fifth transverse section (308) and a sixth transverse section (309); the second longitudinal section (305), the fourth transverse section (307) and the fifth transverse section (308) are in communication with each other, and the third longitudinal section (306) and the sixth transverse section (309) are in communication with each other;

the second longitudinal part (305) and the third longitudinal part (306) are arranged in close proximity and are both positioned in the drill rod (1); the fourth transverse part (307) and the fifth transverse part (308) are mutually perpendicular and are both arranged at the lower end of the second longitudinal part (305); the fourth transverse part (307) is positioned in the first protection piece (401), and the fifth transverse part (308) is positioned in the drill rod (1); the sixth transverse part (309) is arranged at the lower end of the third longitudinal part (306), and the sixth transverse part (309) is positioned in the second protection piece (402);

the three spray heads (5) are respectively arranged at the outer ends of the fourth transverse part (307), the fifth transverse part (308) and the sixth transverse part (309).

9. The multi-nozzle high-pressure rotary-jet stirring curtain composite drill bit of claim 8, wherein:

the first protection piece (401) comprises a first protection cylinder (4011) and a first protection tube (4012) which are equal in length; the first protection cylinder (4011) is arranged on the second blade (202), the first protection tube (4012) is arranged in the first protection cylinder (4011), and the inner ends of the first protection cylinder (4011) and the first protection tube (4012) are connected with the drill rod (1);

the second protector (402) comprises a second protection cylinder (4021) and a second protection tube (4022) which are equal in length; the second protection cylinder (4021) is arranged on the second blade (202), the second protection tube (4022) is arranged in the second protection cylinder (4021), and the inner ends of the second protection cylinder (4021) and the second protection tube (4022) are connected with the drill rod (1);

the fourth transverse part (307) is positioned in the first protection piece (401), and the sixth transverse part (309) is positioned in the second protection piece (402); the length of the first protection tube (4012) is smaller than the length of the second protection tube (4022).

10. The multi-nozzle high-pressure rotary-jet stirring curtain composite drill bit of claim 9, wherein: the spray head (5) spray nozzle arranged at the outer end of the fourth transverse part (307) is positioned in the fourth transverse part (307), the spray head (5) spray nozzle arranged at the outer end of the fifth transverse part (308) is positioned in the fifth transverse part (308), and the spray head (5) spray nozzle arranged at the outer end of the sixth transverse part (309) is positioned in the sixth transverse part (309);

the nozzle diameter of the nozzle (5) at the outer end of the fourth transverse part (307) is equal to the nozzle diameter of the nozzle (5) at the outer end of the sixth transverse part (309), and the nozzle diameter of the nozzle (5) at the outer end of the fifth transverse part (308) is larger than the nozzle diameter of the nozzle (5) at the outer end of the fourth transverse part (307).