CN220849576U - Mechanical multi-diameter reaming and stirring drill bit device for construction of foundation pit supporting inclined strut pile - Google Patents

Abstract

The utility model discloses a mechanical multi-diameter reaming and stirring drill bit device for construction of a foundation pit supporting diagonal bracing pile, which comprises a grouting core pipe, a grouting pipe and a drilling head, wherein the upper end of the grouting core pipe is communicated with a cement slurry source and a pump, and the lower end of the grouting core pipe is communicated with a grouting port of a drill bit; the driving drilling cylinder comprises a conical sleeve with a small upper part and a large lower part, a driving disc fixed at the bottom end of the conical sleeve with the small upper part and the large lower part, and a circular cylinder fixed on the bottom surface of the driving disc, wherein the conical sleeve with the small upper part and the large lower part, the driving disc and the circular cylinder are provided with F-shaped sliding grooves; the top end of the round drill rod is fixedly provided with a spacing column which is used for being embedded at the bottom end of the vertical groove of the F-shaped chute to draw in the prismatic stirring frame and draw out the reaming stirring drill bit device from the steel lattice column in a small diameter, or is embedded in the lower transverse groove of the F-shaped chute to ream in a medium diameter, or is embedded in the upper transverse groove of the F-shaped chute to ream in a large diameter, and the spacing column can slide in the F-shaped chute. The device can ensure stable expanding size, and the expanding wing plates hinged with each other are reliably, firmly and accurately unfolded and folded.

Description

Mechanical multi-diameter reaming and stirring drill bit device for construction of foundation pit supporting inclined strut pile

Technical Field

The utility model relates to the technical field of foundation pit construction equipment, in particular to a mechanical multi-diameter reaming and stirring drill bit device for foundation pit supporting diagonal bracing pile construction.

Background

With the continuous increase of underground space buildings, foundation pit projects of large-area underground space are increased, so that the cost of foundation pit horizontal supports is greatly increased, and the earth anchors are forbidden to be used beyond the ground red line, so that research and development of combined diagonal bracing piles for applying foundation pit support and row piles becomes an urgent task. However, in many coastal areas, the soft soil layer is thicker, and if the pile end of the inclined strut pile needs to enter the hard soil bearing layer, the inclined strut pile is longer, so that the manufacturing cost is high. Therefore, the friction type pile and the expanded diameter pile end are an effective means for improving the bearing capacity of the inclined strut pile, such as steel lattice core pile, composite stirring pile, and are adopted by more and more foundation pit support engineering.

The expanding stirring drill bit used for constructing the friction pile, namely the synchronous concentric inclined strut pile in the prior art has the following defects:

The traditional hydraulic expanding drill bit device has complex and heavy structure, and is relatively difficult to construct when being applied to oblique synchronous concentric oblique strut pile, and is limited by angles and pile diameters. Meanwhile, because the hydraulic expanding drill bit device utilizes the hydraulic expanding oil cylinder piston to drive the wing plate to expand and stretch to realize the expansion and the contraction, the drill bit needs to be provided with two oil pipes in a drill rod besides a necessary grouting pipe, the structure has extremely high precision and technical requirements on the manufacturing process of the drill rod joint, and the oil cylinder piston is arranged in the drill bit, so that the processing difficulty is increased; meanwhile, in the use process, the hydraulic sealing element is easy to fail, so that the failure rate of the drill bit is increased, and the construction progress is influenced.

The non-hydraulic type such as mechanical expanding drill bit in the prior art generally only depends on the action of blocking and self-gravity when a drill rod is drilled down to open the mutually hinged expanding wing plates, and the expanding wing plates are automatically folded when lifted upwards; the expanding stirring wing plate is opened or retracted by the elasticity of the spring, and the expanding stirring structure has low construction precision and cannot guarantee stable expanding size and the reliability, firmness and accuracy of expanding and collapsing. The mechanical expanding drill bit is also required to manually draw and insert a bolt to adjust the opening degree of the mutually hinged expanding wing plates, so that the adjustment is relatively difficult, the labor intensity of workers is relatively high, the construction efficiency is relatively low and certain potential safety hazards exist. After the wing plates hinged with each other are folded, a large driving force is needed for re-opening due to the adhesion effect of sludge and the like, so that the construction progress is affected to a certain extent, and the energy consumption in the construction process, such as the power consumption of a pressing drill bit, is increased.

Disclosure of utility model

The utility model aims to solve the technical problem of providing a mechanical multi-diameter reaming and stirring drill bit device for foundation pit supporting diagonal bracing pile construction, which can ensure stable diameter expansion size, and reliable, firm and accurate expansion and contraction of mutually hinged diameter expansion wing plates.

The technical scheme of the utility model is that the mechanical multi-diameter reaming and stirring drill bit device for construction of the foundation pit supporting diagonal bracing pile comprises a grouting core pipe, wherein the upper end of the grouting core pipe is communicated with a cement slurry source and a pump, and the lower end of the grouting core pipe is communicated with a grouting port of a drill bit;

The driving drilling barrel comprises a taper sleeve with a small upper part and a large lower part at the middle section, a driving disc fixed at the bottom end of the taper sleeve with the small upper part and the large lower part, and a round barrel fixed on the bottom surface of the driving disc, wherein the taper sleeve with the small upper part and the large lower part, the driving disc and the round barrel are provided with F-shaped sliding grooves;

The upper end of the driven drill bit is in sliding fit with the conical sleeve with the small upper part and the large lower part, the fixed plate and the driven drill bit in the central hole of the circular cylinder, and the driven drill bit comprises a circular drill bit rod and a drill bit fixed at the bottom end of the circular drill bit rod;

Also comprises a fixed disk, a pair of arc-shaped long through holes which are symmetrically arranged relative to the circle center are arranged on the top plate of the fixed disk, the bottom surface of the driving disc is symmetrically provided with pin shafts which slide in the respective arc-shaped long through holes and are used for limiting the rotation angle of the driving disc, and the circular sleeve is provided with a structure for limiting the axial direction of the fixed disc;

The device also comprises a pair of upper wing plates and a pair of lower wing plates, wherein the upper wing plates and the lower wing plates are hinged with each other, the top end of each pair of upper wing plates is hinged with the fixed disc, and the bottom end of each pair of lower wing plates is hinged with the drill bit to form a prismatic stirring frame with variable diameter;

The top end of the round drill rod is fixedly provided with a spacing cross column which is used for being embedded at the bottom end of the vertical groove of the F-shaped chute to draw in the prismatic stirring frame and is in a small diameter to draw out a reaming stirring drill bit device from the steel lattice core pile, or is embedded in the lower cross groove of the F-shaped chute to ream with a medium diameter, or is embedded in the upper cross groove of the F-shaped chute to ream with a large diameter, and the spacing cross column can slide in the F-shaped chute.

After the structure is adopted, the mechanical multi-diameter reaming and stirring drill bit device for foundation pit supporting diagonal bracing pile construction has the following advantages:

The mechanical reaming and stirring drill device has the advantages of simple structure and very convenient operation: when the middle diameter reaming is needed, the power head is driven to be pressed downwards, so that the F-shaped chute on the driving drilling cylinder descends to the position-limiting cross column at the top end of the driven drill bit and the lower cross slot of the F-shaped chute are positioned on the same horizontal line, the driving drilling cylinder is rotated clockwise to clamp the position-limiting cross column into the lower cross slot of the F-shaped chute, and then the driving drilling cylinder is rotated clockwise to drive the driven drill bit and the prismatic stirring frame to spray slurry downwards and ream; when the large-diameter reaming is needed from the bottom of the stirring pile, the driving drilling cylinder is rotated anticlockwise to enable the limiting transverse column to retract into the vertical groove of the F-shaped chute, the power head is driven to downwards press the F-shaped chute on the driving drilling cylinder to enable the limiting transverse column on the top of the driven drill bit to be on the same horizontal line with the upper transverse groove of the F-shaped chute, the driving drilling cylinder is rotated clockwise to enable the limiting transverse column to be clamped into the upper transverse groove of the F-shaped chute, and then the driving drilling cylinder is rotated clockwise to drive the driven drill bit and the prismatic stirring frame to downwards drill, spray slurry and large-diameter reaming. When the prismatic stirring frame is required to be folded, the driving drilling cylinder is rotated anticlockwise to enable the limiting transverse column to retract into the vertical groove of the F-shaped sliding groove, the driving power head is driven to pull up to drive the driving drilling cylinder to move upwards, the prismatic stirring frame is folded to a small diameter under the constraint of the inner hole of the lattice core pile, the limiting transverse column is restored to the bottom end of the vertical groove of the F-shaped sliding groove, and the mechanical reaming and stirring drill device can be pulled out to finish the construction of the variable diameter stirring pile.

The mechanical reaming and stirring drill device has relatively high construction precision, can ensure stable reaming size and reliability, firmness and accuracy of unfolding and folding, and has controllable construction quality and relatively good construction quality. The medium diameter reaming, the large diameter reaming and the folding and withdrawing are automatically realized by the equipment operating device, the adjustment is flexible, convenient and quick, the labor intensity of workers is relatively small, the construction efficiency is relatively high, and the construction is safe.

Further, the lower end of the round sleeve at the lower end of the driving drilling barrel is symmetrically provided with a pair of angle limiting blocks which prevent the upper wing plate and the lower wing plate from being folded to form a vertical line. After the structure is adopted, the folded upper wing plate and the lower wing plate are not in a vertical straight line, namely, are not in dead angles, and a certain angle is reserved when the upper wing plate and the lower wing plate are unfolded, so that the unfolding is quick and quick, the normal construction progress is ensured, the energy consumption in the construction process is not increased additionally, and the power consumption of a pressing drill bit is not increased, namely, the power source consumption during the unfolding is relatively saved.

Further, the angle limiting block is rectangular, the inner surface of the rectangular angle limiting block is an arc-shaped surface matched with the outer circumferential surface of the circular sleeve, each angle limiting block is provided with one or more first through holes, and one or more first screws penetrate through the one or more first through holes in the rectangular angle limiting block and are screwed into the one or more first threaded holes in the circular sleeve. After the structure is adopted, the device is more convenient and quicker when the device is required to be cleaned, maintained and the like and is required to be disassembled and installed.

Further, a detachable structure is adopted for the axial limiting structure of the fixed disc: a pair of arc-shaped supporting blocks are symmetrically arranged on the circular sleeve on the bottom surface of the fixed disc, and each arc-shaped supporting block is fastened by one or more second screws penetrating through one or more second through holes on the arc-shaped supporting blocks and screwed into one or more second threaded holes on the circular sleeve. After the structure is adopted, the device is more convenient and quicker when the device is required to be cleaned, maintained and the like and is required to be disassembled and installed.

Further, the top ends of the upper wing plates are respectively provided with a third through hole, the fixed disc is symmetrically provided with first grooves for accommodating the top ends of the upper wing plates to rotate in, the respective first bolts penetrate through the respective fourth through holes on the two walls of the first grooves and the third through holes on the top ends of the upper wing plates, and the respective first nuts axially limit the first bolts. After the structure is adopted, the stable expanding size and the reliability, the firmness and the accuracy of expanding and collapsing are further ensured, and the construction quality is controllable and the technical effect is relatively good. Meanwhile, when the device needs to be cleaned, maintained and the like and needs to be disassembled and installed, the device is more convenient and quicker.

Further, the top ends of the pair of lower wing plates are respectively provided with a pair of fifth through holes and a second groove for accommodating the bottom ends of the pair of upper wing plates to rotate in the fifth through holes, the respective second bolts penetrate through the respective fifth through holes on the two walls of the second groove and the sixth through holes on the bottom ends of the pair of upper wing plates, and the respective second nuts axially limit the second bolts. After the structure is adopted, the stable expanding size and the reliability, the firmness and the accuracy of expanding and collapsing are further ensured, and the construction quality is controllable and the technical effect is relatively good. Meanwhile, when the device needs to be cleaned, maintained and the like and needs to be disassembled and installed, the device is more convenient and quicker.

Further, the bottom ends of the pair of lower wing plates are respectively provided with a third groove for accommodating the two sides of the top of the drill bit to rotate in, the respective third bolts penetrate through the respective sixth through holes on the two walls of the third groove, and the respective third nuts axially limit the third bolts. After the structure is adopted, the stable expanding size and the reliability, the firmness and the accuracy of expanding and collapsing are further ensured, and the construction quality is controllable and the technical effect is relatively good. Meanwhile, when the device needs to be cleaned, maintained and the like and needs to be disassembled and installed, the device is more convenient and quicker.

Further, the top end of the driving drilling cylinder is connected with the lower end of the drill rod into a flange plate for connection: the top end of the drill rod is connected with a power head which is arranged on the pile driver guide frame and provided with a drill rod rotation driving device, the lower end of the drill rod is provided with a first flange, the top end of the driving drilling cylinder is provided with a second flange, and the two flanges are fastened by a plurality of fourth nuts after passing through a plurality of corresponding through holes of the two flanges through a plurality of fourth bolts; the upper end of the grouting core pipe is connected with the bottom end of a grouting pipe in the drill rod, and the top end of the grouting pipe is communicated with a cement slurry source and a pump. After the structure is adopted, the inclined drilling rotary spraying stirring and pile planting equipment for construction of the foundation pit supporting inclined strut pile is more convenient and reliable in connection, and the slurry spraying pipe is more convenient and reliable in connection with a cement slurry source such as a cement slurry barrel and a slurry conveying pump on a floor surface, so that perfect equipment conditions and slurry conveying guarantee are created for construction of the mechanical reaming stirring drilling device.

Drawings

Fig. 1 is a schematic view of an exploded construction of a reamer head assembly of the present utility model.

Fig. 2 is an enlarged schematic view of the structure of fig. 1 a.

Fig. 3 is an enlarged schematic view of the structure of fig. 1B.

Fig. 4 is an enlarged schematic view of the structure of fig. 1C.

Fig. 5 is an enlarged schematic view of the structure of D in fig. 1.

Fig. 6 is a schematic view of the reamer head assembly of the present utility model in a reduced diameter, collapsed state.

Fig. 7 is a schematic view showing the structure of the reamer head device of the present utility model in a medium diameter reaming state.

Fig. 8 is a schematic view showing the structure of the reamer head device of the present utility model in a large-diameter reaming state.

Fig. 9 is a schematic view of the structure of the active drill barrel and the passive drill in the reamer head apparatus of the present utility model.

Fig. 10 is a schematic view of the structure of fig. 9 omitting the taper sleeve, the driving disk, the arc-shaped supporting block and the angle limiting block.

The figure shows:

1. 1.1 parts of driving drilling barrel, 1.2 parts of driving disc, 1.3 parts of conical sleeve with small upper part and large lower part, 1.4 parts of external thread column, 1.5 parts of second flange, 1.6 parts of ninth through hole, 1.7 parts of internal thread sleeve, 1.8 parts of upper transverse groove, 1.8 parts of vertical groove, 1.9 parts of pin shaft, 1.10 parts of lower transverse groove, 1.11 parts of F-shaped chute, 1.12 parts of circular sleeve;

2. 2.1 parts of grouting core pipe, 2.2 parts of lock ring nut, 2.3 parts of first sealing ring, 2.3 parts of metal sealing sleeve, 2.4 parts of external screw thread, 2.5 parts of second sealing ring, 2.6 parts of circular boss, 2.7 parts of core pipe body;

3. 3.1 parts of fixed disc, 3.2 parts of first nut, 3.2 parts of first groove, 3.3 parts of fourth through hole, 3.4 parts of first bolt, 3.5 parts of second through hole, 3.6 parts of second screw, 3.7 parts of arc-shaped supporting block, 3.8 parts of arc-shaped long through hole;

4. 4.1 parts of prismatic stirring rack, 4.2 parts of angle limiting blocks, 4.3 parts of first through holes, 4.4 parts of first screws, 4.4 parts of third bolts, 4.5 parts of third nuts, 4.6 parts of first stirring teeth, 4.7 parts of second grooves, 4.8 parts of second bolts, 4.9 parts of sixth through holes, 4.10 parts of second nuts, 4.11 parts of upper wing plates; 4.12, a third through hole; 4.13, fifth through holes; 4.14, seventh through hole; 4.15, a third groove; 4.16, lower wing plate;

5. 5.1 parts of passive drill bit, 5.2 parts of drill bit, 5.3 parts of second mixing teeth, 5.3 parts of eighth through holes, 5.4 parts of guniting holes, 5.5 parts of central axial holes, 5.6 parts of limiting cross columns, 5.7 parts of round drill bit rods.

Detailed Description

The following describes the embodiments of the present utility model further with reference to the drawings. It should be noted that the description of these embodiments is for aiding in understanding the present utility model, but is not to be construed as limiting the utility model. In addition, the technical features described in the following embodiments of the present utility model may be combined with each other as long as they do not collide with each other.

As shown in fig. 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10.

The utility model relates to a mechanical multi-diameter reaming and stirring drill bit device for construction of a foundation pit supporting diagonal bracing pile, which comprises a grouting core pipe 2, wherein the upper end of the grouting core pipe is communicated with a cement slurry source and a pump, and the lower end of the grouting core pipe is communicated with a grouting port 5.4 of a drill bit such as a drill bit 5.1. And the foundation pit supporting slope strut pile is a steel lattice core pile composite stirring pile.

The utility model discloses a mechanical multi-diameter reaming stirring drill bit device for construction of a foundation pit supporting inclined strut pile, which also comprises an active drilling cylinder 1, wherein the top end or the upper end of the active drilling cylinder 1 is connected with the lower end of a drill rod, the active drilling cylinder 1 comprises a conical sleeve 1.2 with a small upper part and a large lower part, an active disc 1.1 fixed at the bottom end of the conical sleeve 1.2 with a small upper part and a large lower part, a circular cylinder 1.12 fixed at the bottom surface of the active disc 1.1, and F-shaped sliding grooves 1.11 are formed in the conical sleeve 1.2 with a small upper part and a large lower part, the active disc 1.1 and the circular cylinder 1.12. It is not difficult to understand: the F-shaped chute 1.11 is provided with a vertical through hole and a horizontal through hole on the conical sleeve 1.2 with a small upper part and a large lower part and a circular cylinder, and the inner wall of the driving disc is provided with a vertical groove; the conical sleeve 1.2 with the small upper part and the large lower part is convenient for the device to be folded and lifted from the inner hole of the steel lattice column.

The utility model discloses a mechanical multi-diameter reaming and stirring drill bit device for construction of a foundation pit supporting diagonal bracing pile, which also comprises a driven drill bit 5, wherein the upper end of the driven drill bit 5 is in sliding fit with a conical sleeve 1.2 with a small upper part and a large lower part, a fixed plate 3 and a central hole of a circular sleeve 1.12, and the driven drill bit 5 comprises a circular drill bit rod 5.7 and a drill bit 5.1 fixed at the bottom end of the circular drill bit rod 5.7. It will be appreciated that the passive drill bit 5, which is a sliding fit in the central bore of the small-top-down large-cone sleeve 1.2, the fixed plate 3 and the circular sleeve 1.12, refers to a substantial part of the circular bit shank 5.7.

The utility model discloses a mechanical multi-diameter reaming and stirring drill bit device for construction of a foundation pit supporting diagonal bracing pile, which further comprises a fixed disc 3, wherein a pair of arc-shaped long through holes 3.8 which are symmetrically arranged relative to the circle center are formed in the top plate of the fixed disc 3, the bottom surface of a driving disc 1.1 is symmetrically arranged and slides in each arc-shaped long through hole 3.8, pin shafts 1.9 for limiting the rotation angle of the driving disc 1.1 are used for sliding, and a structure for limiting the fixed disc 3 axially is arranged on a circular sleeve 1.12. It will be appreciated that the axial limit structure is an axial limit to the bottom surface of the fixed disk 3. The fixed disk 3 is also passive during construction.

The utility model discloses a mechanical multi-diameter reaming and stirring drill bit device for construction of a foundation pit supporting diagonal bracing pile, which further comprises a pair of upper wing plates 4.11 and a pair of lower wing plates 4.16, wherein the upper wing plates 4.11 are hinged with the lower wing plates 4.16, the top end of each pair of upper wing plates 4.11 is hinged with a fixed disc 3, and the bottom end of each pair of lower wing plates 4.16 is hinged with a drill bit 5.1 to form a prismatic stirring frame 4 with a variable diameter.

The top end of the round drill bit rod 5.7 is fixedly provided with a limiting transverse column 5.6 which is used for being embedded at the bottom end of a vertical groove 1.8 of the F-shaped chute 1.1 to furl the prismatic stirring frame 4 and draw out a reaming stirring drill bit device from a steel lattice core pile or a steel lattice column in a small-diameter or the narrowest state of the width of the prismatic stirring frame 4, or is embedded in a lower transverse groove 1.10 of the F-shaped chute 1.1 to ream in a middle state of the width of the prismatic stirring frame 4, or is embedded in an upper transverse groove 1.7 of the F-shaped chute 1.11 to ream in a widest state of the width of the prismatic stirring frame 4, and the limiting transverse column 5.6 can slide in the F-shaped chute 1.11.

The lower end of the circular sleeve 1.12 is symmetrically provided with a pair of angle limiting blocks 4.2 which prevent the upper wing plate 4.11 and the lower wing plate 4.16 from being folded to form a vertical line.

The angle limiting blocks 4.2 are rectangular, the inner surfaces of the rectangular angle limiting blocks 4.2 are arc-shaped surfaces matched with the outer circumferential surfaces of the circular sleeves 1.12, one or more first through holes 4.1 are formed in each angle limiting block 4.2, one or more first screws 4.3 penetrate through one or more first through holes 4.1 in the rectangular angle limiting blocks 4.2, and are screwed into one or more first threaded holes in the circular sleeves 1.12.

The structure for axially limiting the fixed disc 3 adopts a detachable structure: the circular sleeve 1.12 on the bottom surface of the fixed disc 3 is provided with a pair of arc-shaped supporting blocks 3.7 which are symmetrically arranged, and each arc-shaped supporting block 3.7 is fastened by one or more second screws 3.6 which pass through one or more second through holes 3.5 on the arc-shaped supporting blocks 3.7 and are screwed on one or more second threaded holes 3.6 on the circular sleeve 1.12.

The top ends of the pair of upper wing plates 4.11 are respectively provided with a third through hole 4.12, the fixed disc 3 is symmetrically provided with a first groove 3.2 for accommodating the top ends of the pair of upper wing plates 4.11 to rotate in, the respective first bolts 3.4 penetrate through the respective fourth through holes 3.3 on the two walls of the first groove 3.2 and the third through holes 4.12 at the top ends of the upper wing plates 4.11, and the respective first nuts 3.1 limit the first bolts 3.4 axially.

The top ends of the pair of lower wing plates 4.16 are respectively provided with a pair of fifth through holes 4.13 and a second groove 4.7 for accommodating the bottom ends of the pair of upper wing plates 4.11 to rotate in, and respective second bolts 4.8 pass through the respective fifth through holes 4.13 on the two walls of the second groove 4.7 and the sixth through holes 4.9 at the bottom ends of the pair of upper wing plates 4.11, and are axially limited by respective second nuts 4.10 on the second bolts 4.8.

The bottom ends of the pair of lower wing plates 4.16 are respectively provided with a third groove 4.15 which is used for accommodating the two sides of the top of the drill bit 5.1 and rotates in the third grooves, the respective third bolts 4.4 penetrate through the respective seventh through holes 4.14 and eighth through holes 5.3 on the two walls of the third groove 4.15, and the respective third nuts 4.5 limit the third bolts 4.4 axially.

It will be appreciated that a plurality of wear blocks, such as first mixing teeth 4.6, are provided on the respective outer sides of the pair of lower wing plates 4.16. The bottom of the two inclined planes of the heart-shaped drill bit 5.1 is also provided with a plurality of abrasion-resistant blocks such as second mixing teeth 5.2.

The top end of the driving drilling cylinder 1 is connected with the lower end of the drill rod through a flange plate: the top of the drill rod is connected with a power head which is arranged on a pile driver guide frame and provided with a drill rod rotation driving device, the lower end of the drill rod is provided with a first flange, the top of the driving drilling cylinder 1 is provided with a second flange 1.4, and the two flanges are fastened by a plurality of fourth nuts after passing through a plurality of corresponding through holes of the two flanges, such as a ninth through hole 3.5, through a plurality of fourth bolts. The upper end of the grouting core pipe 2 is connected with the bottom end of a grouting pipe in the drill rod, and the top end of the grouting pipe is communicated with a cement slurry source such as a cement slurry barrel and a pump. The pile machine guide frame is also called as an inclined strut.

The concrete connection structure of the grouting core pipe 2 is as follows: the lower end or bottom end of the core tube body 2.7 of the grouting core tube 2 can be sealed with the circular inner wall of the central axial hole 5.5 of the circular drill rod 5.7 of the circular passive drill bit 5 through a metal sealing sleeve 2.3 and a plurality of first sealing rings 2.2 such as rubber sealing rings arranged on the surface of the metal sealing sleeve 2.3, and a slurry outlet of the grouting core tube 2 is communicated with a slurry spraying hole 5.4 on the drill bit 5.1. The upper end or top end of the grouting core pipe 2 can extend out of the second flange plate by more than 1.4, the extending part can be in a step shape, the large diameter is a circular boss 2.6, the small diameter is an external thread 2.4 used for being connected with a slurry conveying pipe in a drill rod, a lock ring nut 2.1 is used for being connected with the slurry conveying pipe, and a second sealing ring 2.5 can be further arranged at the connecting position.

It should be understood that the driving drilling barrel 1 and the second flange 1.4 should be fixedly connected, but for installing the grouting core pipe 2, the section is provided with male and female threads, for example, an external thread column 1.3 is arranged on a round pipe connected with the second flange 1.4, an internal thread sleeve 1.6 is arranged on a round pipe connected with a conical sleeve 1.2 with a small upper part and a large lower part, for enabling the second flange 1.4 to rotate anticlockwise or clockwise, the conical sleeve 1.2 with the large upper part and the circular sleeve 1.12 with the small upper part can be driven to rotate, a plugging cross pin can be arranged on the screwed internal thread sleeve 1.6 and the external thread column 1.3, and two ends of the plugging cross pin are provided with structures for limiting the axial direction of the plugging cross pin, for example, a bolt and a nut are adopted for fixing, and of course, the screwed internal thread sleeve 1.6 and the external thread column 1.3 can be directly welded for fixing.

The mechanical reaming and stirring drill bit device comprises the following construction processes of reaming and slurry jet grouting by inclined drilling and jet grouting stirring and pile planting equipment such as steel lattice core pile planting equipment for foundation pit supporting inclined strut pile construction: the driving power head drives the power head to press downwards, so that the F-shaped chute 1.11 on the driving drilling cylinder 1 descends to the limit cross column 5.6 at the top end of the driven drill bit and the lower cross groove 1.10 of the F-shaped chute 1.11 are on the same horizontal line, the driving drilling cylinder 1 is rotated clockwise to clamp the limit cross column 5.6 into the lower cross groove 1.10 of the F-shaped chute 1.11, and then the driving drilling cylinder 1 is rotated clockwise to drive the driven drill bit 5 and the prismatic stirring frame 4 to spray slurry downwards and ream; when the large-diameter reaming is needed from the bottom of the mixing pile, the driving drilling cylinder 1 is rotated anticlockwise to enable the limit transverse column 5.6 to retract into the vertical groove 1.8 of the F-shaped chute 1.11, the driving power head is driven to downwards press, the F-shaped chute 1.11 on the driving drilling cylinder 1 is enabled to downwards move to the position where the limit transverse column 5.6 at the top end of the driven drilling bit 5 is on the same horizontal line with the upper transverse groove 1.7 of the F-shaped chute 1.11, the driving drilling cylinder 1 is rotated clockwise to enable the limit transverse column 5.6 to be clamped into the upper transverse groove 1.7 of the F-shaped chute 1.11, and then the driving drilling cylinder 1 is rotated clockwise to drive the driven drilling bit 5 and the prismatic stirring frame 4 to downwards spray slurry and large-diameter reaming. When the prismatic stirring frame 4 is required to be folded, the driving drilling cylinder 1 is rotated anticlockwise to enable the limit transverse column 5.6 to retract into the vertical groove 1.8 of the F-shaped chute 1.11, the driving power head is driven to pull up to drive the driving drilling cylinder 1 to move upwards, the prismatic stirring frame 4 is folded to a small diameter under the constraint of the inner hole of the steel lattice core pile, the limit transverse column 5.6 is also restored to the bottom end of the vertical groove 1.8 of the F-shaped chute 1.11, and the mechanical reaming stirring drill bit device can be pulled out to finish the construction of the rotary spraying stirring pile.

The above-noted components or structures or numbers are not shown in the figures. The drawings are schematic only, and the text descriptions will be followed if the drawings do not coincide with the text descriptions or if the drawings do not coincide with each other.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, and various modifications and variations of the present utility model will be apparent to 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 (8)

1. A mechanical multi-diameter reaming and stirring drill bit device for construction of a foundation pit supporting diagonal bracing pile comprises a grouting core pipe, wherein the upper end of the grouting core pipe is communicated with a cement slurry source and a pump, and the lower end of the grouting core pipe is communicated with a grouting opening of a drill bit; the method is characterized in that:

The driving drilling barrel comprises a taper sleeve with a small upper part and a large lower part at the middle section, a driving disc fixed at the bottom end of the taper sleeve with the small upper part and the large lower part, and a round barrel fixed on the bottom surface of the driving disc, wherein the taper sleeve with the small upper part and the large lower part, the driving disc and the round barrel are provided with F-shaped sliding grooves;

The upper end of the driven drill bit is in sliding fit with the conical sleeve with the small upper part and the large lower part, the fixed plate and the driven drill bit in the central hole of the circular sleeve, and the driven drill bit comprises a circular drill bit rod and a drill bit fixed at the bottom end of the circular drill bit rod;

Also comprises a fixed disk, a pair of arc-shaped long through holes which are symmetrically arranged relative to the circle center are arranged on the top plate of the fixed disk, the bottom surface of the driving disc is symmetrically provided with pin shafts which slide in the respective arc-shaped long through holes and are used for limiting the rotation angle of the driving disc, and the circular sleeve is provided with a structure for limiting the axial direction of the fixed disc;

The device also comprises a pair of upper wing plates and a pair of lower wing plates, wherein the upper wing plates and the lower wing plates are hinged with each other, the top end of each pair of upper wing plates is hinged with the fixed disc, and the bottom end of each pair of lower wing plates is hinged with the drill bit to form a prismatic stirring frame with variable diameter;

The top end of the round drill rod is fixedly provided with a spacing cross column which is used for being embedded at the bottom end of the vertical groove of the F-shaped chute to draw in the prismatic stirring frame and is in a small diameter to draw out a reaming stirring drill bit device from the steel lattice core pile, or is embedded in the lower cross groove of the F-shaped chute to ream with a medium diameter, or is embedded in the upper cross groove of the F-shaped chute to ream with a large diameter, and the spacing cross column can slide in the F-shaped chute.

2. The mechanical multi-diameter reaming and stirring drill device for construction of foundation pit supporting diagonal bracing piles according to claim 1, wherein: the lower end of the round sleeve at the lower end of the driving drilling barrel is symmetrically provided with a pair of angle limiting blocks which prevent the upper wing plate and the lower wing plate from being vertical after being folded.

3. The mechanical multi-diameter reaming and stirring drill device for construction of foundation pit supporting diagonal bracing piles according to claim 1, wherein: the angle limiting blocks are rectangular, the inner surfaces of the rectangular angle limiting blocks are arc-shaped surfaces matched with the outer circumferential surfaces of the circular sleeves, one or more first through holes are formed in each angle limiting block, one or more first screws penetrate through one or more first through holes in the rectangular angle limiting blocks, and the screws are screwed into one or more first threaded holes in the circular sleeves.

4. The mechanical multi-diameter reaming and stirring drill device for construction of foundation pit supporting diagonal bracing piles according to claim 1, wherein: the structure for axially limiting the fixed disc adopts a detachable structure: a pair of arc-shaped supporting blocks are symmetrically arranged on the circular sleeve on the bottom surface of the fixed disc, and each arc-shaped supporting block is fastened by one or more second screws penetrating through one or more second through holes on the arc-shaped supporting blocks and screwed into one or more second threaded holes on the circular sleeve.

5. The mechanical multi-diameter reaming and stirring drill device for construction of foundation pit supporting diagonal bracing piles according to claim 1, wherein: the top ends of the upper wing plates are respectively provided with a third through hole, the fixed disc is symmetrically provided with first grooves for accommodating the top ends of the upper wing plates to rotate in, the respective first bolts penetrate through the respective fourth through holes on the two walls of the first grooves and the third through holes on the top ends of the upper wing plates, and the respective first nuts axially limit the first bolts.

6. The mechanical multi-diameter reaming and stirring drill device for construction of foundation pit supporting diagonal bracing piles according to claim 5, wherein: the top ends of the pair of lower wing plates are respectively provided with a pair of fifth through holes and a second groove for accommodating the bottom ends of the pair of upper wing plates to rotate in, and respective second bolts penetrate through the respective fifth through holes on the two walls of the second groove and the sixth through holes on the bottom ends of the pair of upper wing plates, and are axially limited by respective second nuts.

7. The mechanical multi-diameter reaming and stirring drill device for construction of foundation pit supporting diagonal bracing piles according to claim 6, wherein: the bottom ends of the pair of lower wing plates are respectively provided with a third groove for accommodating the two sides of the drill point top to rotate in, the respective third bolts penetrate through a pair of seventh through holes and an eighth through hole on the two walls of the third groove, and the respective third nuts axially limit the third bolts.

8. The mechanical multi-diameter reaming and stirring drill device for construction of foundation pit supporting diagonal bracing piles according to claim 1, wherein: the top end of the driving drilling cylinder is connected with the lower end of the drill rod through a flange plate: the top end of the drill rod is connected with a power head which is arranged on the pile driver guide frame and provided with a drill rod rotation driving device, the lower end of the drill rod is provided with a first flange, the top end of the driving drilling cylinder is provided with a second flange, and the two flanges are fastened by a plurality of fourth nuts after passing through a plurality of corresponding through holes of the two flanges through a plurality of fourth bolts; the upper end of the grouting core pipe is connected with the bottom end of a grouting pipe in the drill rod, and the top end of the grouting pipe is communicated with a cement slurry source and a pump.