Forming equipment of stiff stirring branch pile, construction method of stiff stirring branch pile and stiff stirring branch pile

Abstract

The invention belongs to the technical field of special piles for foundation engineering, and discloses forming equipment of a stiff stirring branch pile, a construction method of the stiff stirring branch pile and the stiff stirring branch pile. The forming equipment of the stiff stirring branch pile comprises a drill rod and a cutter, the drill rod is provided with a drill bit, and the drill bit is provided with a nozzle; the drilling rod can be connected to an external cement slurry source through a slurry pipeline arranged on the drilling rod; the cutter is arranged on the drill rod, the cutter and the drill bit are arranged at an interval in the axial direction of the drill rod, the cutter has a stretching state and a folding state, in the stretching state, the cuttable diameter of the cutter is larger than the cutting diameter of the drill bit, and in the folding state, the cuttable diameter of the cutter is not larger than the cutting diameter of the drill bit; the cutter can be switched according to the rotating direction of the drill rod and kept in the stretching state or the folding state, the stiff stirring branch pile is formed through the construction method of the stiff stirring branch pile, the expanding body can be formed only by controlling the rotating direction of the drill rod, and the construction difficulty is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of special piles for foundation engineering, and particularly to a forming device for a rigid stirring branch disk pile, a construction method for a rigid stirring branch disk pile, and a rigid stirring branch disk pile. Background Art

[0002] With the development of urban construction, special piles for engineering (rigid stirring branch disk piles) have also developed rapidly. The rigid stirring branch disk piles formed by the technology of bored and squeezed multi-branch disk cast-in-place piles have multiple enlarged-diameter bearing disks (enlarged bodies) spaced axially. During the forming process, most of them use rotary soil extraction, and the excess soil must be transported out, increasing costs.

[0003] In the prior art, a construction device is proposed. It sets high-pressure nozzles on the drill rod blades to generate high-pressure jets to cut and stir the soil. By adjusting the pressure of the high-speed jets, a cement mixing pile with an enlarged body or a high-pressure jet grouting pile with an enlarged body with a diameter ranging from 0.5 m to 10 m can be formed. However, during the forming process of the above rigid stirring branch disk piles, it is necessary to accurately control the speed and pressure of the jets according to different geological conditions in order to accurately form an enlarged body of the required size, and the construction is relatively difficult. Summary of the Invention

[0004] The purpose of the present invention is to provide a forming device for a rigid stirring branch disk pile, a construction method for a rigid stirring branch disk pile, and a rigid stirring branch disk pile, which can reduce the construction difficulty of the rigid stirring branch disk pile.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] A forming device for a rigid stirring branch disk pile, which includes:

[0007] A drill rod, one end of the drill rod can be connected to an external driving device, the other end of the drill rod is provided with a drill bit, and a nozzle is provided on the drill bit. The nozzle can be connected to an external cement slurry source through a mud pipeline arranged on the drill rod;

[0008] A cutting knife, the cutting knife is arranged on the drill rod and is axially spaced from the drill bit on the drill rod. The cutting knife has an extended state and a folded state. In the extended state, the cutting diameter of the cutting knife is greater than the cutting diameter of the drill bit. In the folded state, the cutting diameter of the cutting knife is not greater than the cutting diameter of the drill bit; the cutting knife can be switched and maintained in the extended state or the folded state according to the rotation direction of the drill rod.

[0009] In some embodiments, the cutter includes a cutter seat and a cutting blade, the cutter seat is connected to the drill rod, the first end of the cutting blade is transferred to the cutter seat, and two limit blocks are also provided on the cutter seat. The two limit blocks are set at an angle, and the transfer point between the cutting blade and the cutter seat is located within the angle range of the two limit blocks. When one edge of the cutting blade abuts one of the limit blocks, the cutter is in the extended state; when the other edge of the cutting blade abuts the other limit block, the cutter is in the folded state.

[0010] In some embodiments, two cutters are provided, and the two cutters are symmetrically arranged on both radial sides of the drill rod with respect to the axis center of the drill rod.

[0011] In some embodiments, the cutting blade is detachably connected to the blade holder; and / or, the blade holder is detachably connected to the drill rod.

[0012] In some embodiments, the mud pipeline has two inlets, one of which is used to connect to the cement slurry source, and the other inlet is used to connect to a high-pressure gas source.

[0013] In some embodiments, the forming equipment of the rigid stirring support plate pile further includes stirring blades, a plurality of stirring blades are distributed along the axial direction of the drill rod, and a maximum stirring diameter of the stirring blades is smaller than a cutting diameter of the drill bit.

[0014] In some embodiments, the plurality of stirring blades are spirally distributed along the axial direction of the drill rod.

[0015] A construction method of a rigid stirring support plate pile is also provided, which uses the above-mentioned rigid stirring support plate pile forming equipment and comprises the following steps:

[0016] S1. Measure and determine the location of the rigid stirring support pile;

[0017] S2, connect the drill rod to the pile mixing machine, connect the mud pipeline to the cement slurry source, and adjust the drilling angle;

[0018] S3, driving the drill rod to rotate so that the cutter on the drill rod is in a folded state for drilling, and injecting cement slurry during drilling; when drilling to the designed position of the expansion body, rotating the drill rod in the opposite direction so that the cutter is in an extended state for drilling; then driving the drill rod to rotate in the opposite direction again so that the cutter on the drill rod is in the folded state;

[0019] S4, repeating S3 multiple times to complete the designed number of enlarged bodies;

[0020] S5. Lift the drill pipe.

[0021] In some embodiments, in the step S5, when it is lifted to the height of the diameter-expanded body, the cutter is driven to be in an extended state to perform secondary agitation on the diameter-expanded body.

[0022] A rigid agitation branch disk pile is also provided, and the rigid agitation branch disk pile is formed by using the construction method of the above-mentioned rigid agitation branch disk pile.

[0023] Advantages of the present invention:

[0024] When the drill rod of the above-mentioned cutter is used for drilling, the drill rod is rotated in one direction first to make the cutter in a folded state for drilling. When reaching the designed position of the diameter-expanded body, the drill rod is rotated in the reverse direction to make the cutter in an extended state for drilling, so that the cuttable diameter of the cutter is larger than the cutting diameter of the drill bit. The cutter cuts the soil layer and mixes and agitates with the cement slurry injected by the nozzle to form the diameter-expanded body. After completion, the drill rod is rotated in the reverse direction again for drilling. Thus, it is only necessary to select cutters of different sizes according to the sizes of different diameter-expanded bodies, avoiding the need to precisely control the jet velocity method, and reducing the construction difficulty. Description of the drawings

[0025] Figure 1 is a schematic diagram of the forming equipment of the rigid agitation branch disk pile of the present invention;

[0026] Figure 2 is a schematic diagram of the tool in a folded state in the present invention;

[0027] Figure 3 is a schematic diagram of the tool in an extended state in the present invention;

[0028] Figure 4 is a flowchart of the construction method of the rigid agitation branch disk pile of the present invention.

[0029] Figure 5 is a schematic diagram of the rigid agitation branch disk pile of the present invention.

[0030] In the figure:

[0031] 1. Drill rod; 11. Drill bit; 111. Cutting piece; 112. Pilot drill tooth; 12. Nozzle;

[0032] 2. Cutter; 21. Tool holder; 22. Cutter blade; 23. Limit stop; 24. Seat cover plate;

[0033] 3. Agitation blade;

[0034] 4. Spiral rib;

[0035] 5. Diameter-expanded body. Detailed implementation manners

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only for explaining the present invention, rather than limiting the present invention. In addition, it should be noted that for the sake of description, only the parts related to the present invention are shown in the drawings, rather than all the structures.

[0037] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0038] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0039] In the description of this embodiment, the orientation or positional relationship such as "above", "below", "left", and "right" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0040] Such as Figures 1 to 3As shown in the figure, the present application provides a forming device for a stiffened mixing branch disk pile, which includes a drill pipe 1 and a cutter 2. One end of the drill pipe 1 can be connected to an external driving device, and a drill bit 11 is provided at the other end of the drill pipe 1. A nozzle 12 is provided on the drill bit 11, and the nozzle 12 can be connected to an external cement slurry source through a slurry pipeline provided on the drill pipe 1; the cutter 2 is provided on the drill pipe 1 and is spaced apart from the drill bit 11 in the axial direction of the drill pipe 1. The cutter 2 has an extended state and a folded state. In the extended state, the cutting diameter of the cutter 2 is larger than the cutting diameter of the drill bit 11, and in the folded state, the cutting diameter of the cutter 2 is not larger than the cutting diameter of the drill bit 11; the cutter 2 can be switched and maintained in the extended state or the folded state according to the rotation direction of the drill pipe 1.

[0041] When drilling with the drill pipe 1 provided with the cutter 2, first rotate the drill pipe 1 in one direction to make the cutter 2 in the folded state for drilling. When reaching the design position of the enlarged diameter body 5, then rotate the drill pipe 1 in the reverse direction to make the cutter 2 in the extended state, so that the cutting diameter of the cutter 2 is larger than the cutting diameter of the drill bit 11. The cutter 2 cuts the soil layer and mixes it with the cement slurry injected by the nozzle 12 to form the enlarged diameter body 5. After completion, rotate the drill pipe 1 in the reverse direction again for drilling. Thus, it is only necessary to select cutters 2 of different sizes according to the sizes of different enlarged diameter bodies 5, avoiding the traditional method that requires precise control of the jet velocity and reducing the construction difficulty.

[0042] Such as Figure 2 And Figure 3As shown, in some embodiments, the cutter 2 includes a cutter seat 21 and a cutting blade 22, the cutter seat 21 is connected to the drill rod 1, and the first end of the cutting blade 22 is transferred to the cutter seat 21, so that force is applied to the cutting blade 22, so that the second end of the cutting blade 22 can rotate around its first end; and two limit blocks 23 are also provided on the cutter seat 21, and the two limit blocks 23 are set at an angle, and the transfer point of the cutting blade 22 and the cutter seat 21 is located within the angle range of the two limit blocks 23, so that when the drill rod 1 rotates in one direction, the second end of the cutting blade 22 is subjected to force around its first end. When the drill rod 1 rotates in the reverse direction, when one edge of the cutting blade 22 abuts against the limit stopper 23, it is blocked by the limit stopper 23 and will not continue to rotate, so that the cutting blade 22 is relatively fixed in this rotation direction (it is in one of the extended state or folded state); and when the drill rod 1 rotates in the reverse direction, the second end of the cutting blade 22 is subjected to reverse force and can rotate in the other direction around the first end until the other edge of the cutting blade 22 abuts against another limit stopper 23, and the cutting blade 22 is relatively fixed in this rotation direction (it is in the other of the extended state or folded state). It should be noted here that the angle between the two limit stops 23 is not limited. Exemplarily, the knife seat 21 is located on one of the radial lines of the drill rod 1, one of the limit stops 23 is extended along the radial line, and the other stopper is perpendicular to the radial line, so that when the cutting blade 22 is in the extension direction of the radial line, the cutter 2 is in an extended state, and when the cutting blade 22 is in a direction perpendicular to the radial line, the cutter 2 is in a folded state. In some embodiments, the limit stopper 23 and the knife seat 21 are integrally formed, thereby improving the strength of the limit stopper 23 and extending its service life.

[0043] In some embodiments, two cutters 2 are provided, and the two cutters 2 are symmetrically arranged on radial sides of the drill rod 1 with respect to the axis center of the drill rod 1, so that the states of the two cutters 2 can be switched simultaneously when rotating in the same direction.

[0044] In some embodiments, the cutting blade 22 is detachably connected to the blade holder 21, so that the cutting blades 22 of different sizes can be replaced according to the sizes of the different expansion bodies 5, thereby expanding the scope of use. Exemplarily, the cutting blade 22 and the blade holder 21 can be connected by bolts and other connecting parts. In other embodiments, the blade holder 21 is detachably connected to the drill rod 1, and in order to replace the cutting blade 22, the entire cutter 2 can be directly replaced. Exemplarily, the blade holder 21 and the drill rod 1 can also be connected by bolts and other connecting parts. In some embodiments, the blade holder 21 and the drill rod 1 and the cutting blade 22 and the blade holder 21 can be detachably connected, on the one hand to expand the scope of application, and on the other hand to facilitate maintenance.

[0045] Further, the cutting tool 2 further includes a seat cover plate 24 which is arranged on the limit stop block 23, so that the seat cover plate 24 and the tool holder 21 form a clamping space. The first end of the cutting blade 22 is located in the clamping space, thereby protecting the first end of the cutting blade 22 as much as possible through the cover plate 24 and making the rotation of the cutting blade 22 smoother.

[0046] As Figure 1 shown, in some embodiments, the drill bit 11 includes a plurality of cutting blades 111. A plurality of pilot drill teeth 112 are arranged on the side of the cutting blade 111 facing away from the cutting tool 2. The pilot drill teeth 112 can improve the soil cutting and crushing effect, making the drill bit 11 drill efficiently and stably. In addition, the nozzle 12 is arranged on the cutting blade 111, so that the cement slurry can directly act on the bottom soil, which has a good effect on improving the drilling efficiency and avoiding the difficulty of penetration due to paste drilling.

[0047] Further, the mud pipeline has two inlets. One inlet is used to connect to the cement slurry source, and the other inlet is used to connect to the high-pressure gas source. That is to say, the nozzle 12 can form high-pressure cement slurry to cut and stir the soil during drilling, improving the drilling efficiency.

[0048] In some embodiments, the forming equipment of the stiff mixing branch disk pile further includes stirring blades 3. A plurality of stirring blades 3 are distributed along the circumference of the drill pipe 1. The maximum stirring diameter of the stirring blades 3 is smaller than the cutting diameter of the drill bit 11. Then, the broken soil and the cement slurry are stirred and mixed by the stirring blades 3 to ensure the mixing quality, thereby improving the structural strength. Exemplarily, a plurality of stirring blades 3 are spirally distributed along the axial direction of the drill pipe 1. In the current embodiment, spiral ribs 4 are also arranged on the outer side of the drill pipe 1 in the same direction as the stirring blades 3 to ensure the smoothness of the vertical channel for the high-pressure gas to flow back from the nozzle 12, ensuring that the high-pressure gas stirs the cement soil more evenly. The length of the stirring blades 3 along the drill pipe is not less than 7m to ensure the verticality and stability of the drill pipe 1.

[0049] As Figure 4 shown, the present application also provides a construction method for a stiff mixing branch disk pile. The construction method uses the above-mentioned forming equipment of the stiff mixing branch disk pile, and includes the following steps:

[0050] S1. Based on the provided traverse points as the starting basis, a total station is arranged at the construction site for measurement to determine the installation position of the stiff mixing branch disk pile, and the positioning deviation of the stiff mixing branch disk pile is less than 10mm.

[0051] S2. Connect one end of the drill pipe 1 far from the drill bit 11 to the mixing pile rig, and connect the cement source and the high-pressure gas source to the slurry pipeline respectively. The cement source uses a cement mixing background station, which mainly consists of a cement silo, an automatic conveying spiral feeding pipe, an upper mixing barrel, a lower slurry storage barrel, a high-pressure fluid pump, and a control background station; the high-pressure gas source uses an air compressor system in the prior art, which will not be elaborated here; then adjust the drilling angle and prepare for drilling.

[0052] S3. Start the rotation of the drill pipe 1, and make the cutter 2 on the drill pipe 1 drill in a folded state. During the drilling process, inject the cement slurry evenly and continuously, so that the cement slurry is fully stirred and mixed with the broken original foundation; when drilling to the designed position of the expanded diameter body 5, rotate the drill pipe 1 in the reverse direction, and make the cutter 2 drill in an extended state to expand the cutting range of the cutting blade 22. During this period, appropriately reduce the pressure of the cement slurry and appropriately reduce the rotation speed of the drill pipe 1 to ensure that the cutter 2 is in an extended state. After the cutter 2 is unfolded, due to the increase in drilling resistance, the background construction current increases significantly. If the background current does not increase, it means that the cutter 2 is not unfolded. Cooperate with a small up and down lifting of the drill to make the cutter 2 in an unfolded state. After the cutter 2 is unfolded, the spraying pressure of the cement slurry returns to normal. The unfolded cutting blade 22 cuts and breaks the soil body and is fully mixed and stirred with the injected upward cement slurry to make the expanded diameter body 5; after the above-mentioned expanded diameter body 5 is completed, drive the drill pipe 1 to rotate in the reverse direction again to make the cutter 2 on the drill pipe 1 in a folded state.

[0053] S4. Repeat the above S3 steps multiple times to complete the designed number of expanded diameter bodies 5.

[0054] S5. Lift the drill pipe 1, and continue to inject the cement slurry during the lifting process of the drill pipe 1; at the same time, the ratio of the spraying amount during drilling to the spraying amount during lifting is greater than 1.2; in addition, when lifting to the height of the expanded diameter body 5, appropriately reduce the spraying pressure and the rotation speed of the drill pipe 1, drive the cutter 2 to be in an extended state, and continue to use the cutting blade 22 to stir the expanded diameter body 5, that is, during the drilling and lifting processes, the part of the expanded diameter body 5 is broken and stirred twice. The number of rotation times of the two breakings and stirrings is not specifically limited and can be determined according to different soil layers and different construction environments; then continue to lift the drill pipe 1. When exceeding the range of the expanded diameter body 5, the rotation speed and lifting speed of the drill pipe 1 can be increased until the drill pipe 1 is lifted out. Then, rigid piles can be implanted into the stiffened mixing branch disk pile, etc., which will not be elaborated here.

[0055] Therefore, by adopting the above construction method of the stiffened mixing branch disk pile, during the formation process of the expanded diameter body 5 of the stiffened mixing branch disk pile, it is only necessary to control the rotation direction of the drill pipe 1, avoiding the need to precisely control the velocity and pressure of the jet flow, and reducing the construction difficulty.

[0056] Such as Figure 5As shown, the present application also provides a rigid stirring branch disk pile, which is formed by using the construction method of the above-mentioned rigid stirring branch disk pile.

[0057] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. The forming equipment of rigid stirring support pile is characterized by: include: A drill rod (1), one end of the drill rod (1) being connectable to an external driving device, the other end of the drill rod (1) being provided with a drill bit (11), the drill bit (11) being provided with a nozzle (12), and the nozzle (12) being connectable to an external cement slurry source via a mud pipeline provided on the drill rod (1); A cutter (2), the cutter (2) being arranged on the drill rod (1) and spaced apart from the drill bit (11) in the axial direction of the drill rod (1); the cutter (2) having an extended state and a folded state; in the extended state, the cuttable diameter of the cutter (2) is larger than the cuttable diameter of the drill bit (11); in the folded state, the cuttable diameter of the cutter (2) is not larger than the cuttable diameter of the drill bit (11); the cutter (2) can be switched according to the rotation direction of the drill rod (1) and maintained in the extended state or the folded state.

2. The forming equipment of the rigid stirring support pile according to claim 1 is characterized in that: The cutter (2) comprises a cutter seat (21) and a cutter blade (22); the cutter seat (21) is connected to the drill rod (1); a first end of the cutter blade (22) is transferred to the cutter seat (21); two limit blocks (23) are also arranged on the cutter seat (21); the two limit blocks (23) are arranged at an angle; a transfer point between the cutter blade (22) and the cutter seat (21) is located within the angle range of the two limit blocks (23); when one edge of the cutter blade (22) abuts against one of the limit blocks (23), the cutter (2) is in the extended state; when the other edge of the cutter blade (22) abuts against the other limit block (23), the cutter (2) is in the folded state.

3. The forming equipment of the rigid stirring support pile according to claim 2 is characterized in that: Two cutters (2) are provided, and the two cutters (2) are symmetrically arranged on both radial sides of the drill rod (1) with respect to the axis center of the drill rod (1).

4. The forming equipment of the rigid stirring support pile according to claim 2 is characterized in that: The cutting blade (22) is detachably connected to the blade holder (21); and / or the blade holder (21) is detachably connected to the drill rod (1).

5. The forming equipment of the rigid stirring support pile according to claim 1 is characterized in that: The mud pipeline has two inlets, one of which is used to connect to the cement slurry source, and the other is used to connect to the high-pressure gas source.

6. The forming equipment of the rigid stirring support pile according to claim 1 is characterized in that: The forming equipment of the rigid stirring support plate pile further comprises stirring blades (3), a plurality of stirring blades (3) are distributed along the axial direction of the drill rod (1), and the maximum stirring diameter of the stirring blades (3) is smaller than the cutting diameter of the drill bit (11).

7. The forming equipment of the rigid stirring support pile according to claim 6 is characterized in that: The outer side of the drill rod (1) is provided with a spiral rib (4) which spirals in the same direction as the stirring blade (3).

8. A construction method for a rigid stirring support plate pile, using the rigid stirring support plate pile forming equipment according to any one of claims 1 to 7, characterized in that: The steps include: S1. Measure and determine the location of the rigid stirring support pile; S2, connecting the drill rod (1) to the pile mixing machine, connecting the mud pipeline to the cement slurry source, and adjusting the drilling angle; S3, driving the drill rod (1) to rotate, so that the cutter (2) on the drill rod (1) is in a folded state for drilling, and cement slurry is injected during drilling; when drilling reaches the designed position of the expansion body (5), the drill rod (1) is rotated in the reverse direction, so that the cutter (2) is in an extended state for drilling; then the drill rod (1) is driven to rotate in the reverse direction again, so that the cutter (2) on the drill rod (1) is in the folded state; S4, repeating S3 multiple times to complete the designed number of the enlarged bodies (5); S5. Lift the drill pipe (1).

9. The construction method of the rigid stirring support pile according to claim 8, characterized in that: In the step S5, when the height of the enlarged body (5) is reached, the cutter (2) is driven to be in an extended state to perform secondary stirring on the enlarged body (5).

10. Rigid stirring support pile, characterized in that: The rigid stirring support plate pile is formed by the construction method of the rigid stirring support plate pile as described in claim 9.

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