Annular rotary excavating device for cast-in-place concrete large-diameter tubular pile

Abstract

The utility model discloses an annular rotary excavating device for a cast-in-place concrete large-diameter tubular pile, belongs to the field of missile transportation equipment, and aims to solve the technical problem that in the prior art, a hard soil layer is difficult to penetrate through in a traditional pipe sinking cast-in-place pile method. The device comprises a rack, a twist drill, an outer cylinder and an inner cylinder, the twist drill is movably connected with the rack through a twist drill lifting mechanism; the inner cylinder is connected with the twist drill lifting mechanism through a power mechanism; the outer cylinder is movably connected with the rack through an outer cylinder lifting mechanism; and the twist drill, the outer cylinder and the inner cylinder are concentrically arranged. The annular rotary excavating device for the cast-in-place concrete large-diameter tubular pile can achieve rotary excavating and soil taking in complex terrains, is high in construction efficiency and easy to operate, and can effectively prevent pile core soil from rising and reduce soil squeezing pressure.

Description

Technical Field

[0001] The utility model relates to the technical field of civil engineering and construction, in particular to a circular rotary drilling device for cast-in-place concrete large-diameter pipe piles. Background Art

[0002] Cast-in-place concrete large-diameter pipe pile (PCC pile for short) is an efficient and economical soft soil foundation reinforcement technology and construction process for on-site pouring. The pile is mainly formed by vibrating the mold, automatically discharging soil, and pouring concrete on site. The specific steps are: relying on the vibration force of the hammer head on the upper part of the sinking cavity, the annular cavity formed by the inner and outer double-layer casing is driven into the predetermined design depth under the protection of the flap pile shoe; then concrete is poured on site in the cavity, and the pipe is pulled out while vibrating, and a concrete pipe pile is formed in the annular cavity. If necessary, a steel cage can also be placed in the annular cavity to form a cast-in-place reinforced concrete thin-wall pipe pile. In the process of pile formation, the template effect, vibration effect and compaction effect are fully utilized, which effectively strengthens the performance of the dense soil during the vibration and compaction process, prevents the shrinkage and collapse of the wall, and ensures that the pile body is complete and reliable. Due to the advantages of strong construction adaptability, wide application range, easy control of construction quality, low reinforcement cost per unit area, and outstanding reinforcement effect, the cast-in-place concrete large-diameter pipe pile has a good promotion and application value and has been widely used in engineering.

[0003] However, there are still some shortcomings in the existing PCC piles. At present, there are various complex soil layers in engineering construction, especially when cast-in-place concrete pipe piles are promoted and applied from the soft soil areas in the east to the central and western regions, they often encounter hard and thick soil layers. The traditional sinking pipe cast-in-place pile method is difficult to penetrate the hard soil layer, so this method is not very applicable. Utility Model Content

[0004] The utility model aims to provide a circular rotary drilling device for large-diameter cast-in-place concrete pipe piles, so as to solve the technical problem that the traditional pipe sinking and grouting pile method in the prior art is difficult to penetrate the hard soil layer.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] The utility model provides a cast-in-place concrete large-diameter pipe pile annular rotary drilling device, comprising a frame, an auger, an outer cylinder and an inner cylinder; the auger is movably connected to the frame through an auger lifting mechanism; the inner cylinder is connected to the auger lifting mechanism through a power mechanism; the outer cylinder is movably connected to the frame through the outer cylinder lifting mechanism;

[0007] The auger, outer cylinder and inner cylinder are concentrically arranged.

[0008] Optionally or preferably, the auger is surrounded by a plurality of sets of spiral blades; the plurality of sets of spiral blades are arranged continuously;

[0009] A cutter head assembly is arranged at the end of the spiral blade, and the cutter head assembly comprises a plurality of alloy teeth.

[0010] Optionally or preferably, an eccentric alloy tooth is provided on the outer side of the plurality of alloy teeth;

[0011] When the eccentric alloy tooth rotates to the outside, the distance between the eccentric alloy tooth and the center of the spiral drill is greater than the radius of the outer cylinder.

[0012] Optionally or preferably, the power mechanism includes an inner barrel separation hydraulic cylinder and a power head;

[0013] The inner cylinder separation hydraulic cylinder is fixedly connected to the inner cylinder and is used to control the sinking of the inner cylinder; the power head is connected to the auger and is used to drive the auger to rotate.

[0014] Optionally or preferably, the outer cylinder has a diameter of 1000 mm, the inner cylinder has a diameter of 700 mm, and the spacing between the outer cylinder and the inner cylinder is 150 mm;

[0015] The spiral pitch of the auger is 400 mm and the spiral height is 110 mm.

[0016] Optionally or preferably, the cutter head assembly is provided in two groups; each group of the cutter head assembly includes two of the alloy teeth and one of the eccentric alloy teeth.

[0017] Based on the above technical solution, the utility model can at least produce the following technical effects:

[0018] The utility model provides a cast-in-place concrete large-diameter pipe pile annular rotary drilling device, which makes the pile body have the same diameter by concentrically arranging the auger, the outer cylinder and the inner cylinder, thereby ensuring the quality of the pile;

[0019] In addition, by using a circular spiral drill to drill the soil, rotary excavation of soil can be achieved in complex terrain, with high construction efficiency and simple operation. At the same time, it can effectively prevent the core soil of the pile from rising and reduce the soil squeezing pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model of a circular rotary drilling device for cast-in-place concrete large-diameter pipe piles;

[0021] Figure 2 The utility model is a schematic diagram of the local structure of the end of the spiral drill in the circular rotary drilling device for large-diameter cast-in-place concrete pipe piles.

[0022] In the figure: 1. auger lifting mechanism; 2. power mechanism; 21. inner cylinder separation hydraulic cylinder; 22. power head; 3. auger; 31. spiral blade; 32. eccentric alloy teeth; 33. alloy teeth; 4. outer cylinder lifting mechanism; 5. outer cylinder; 6. inner cylinder; 7. frame. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model; obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the utility model without making creative work belong to the scope of protection of the utility model.

[0024] Example

[0025] See also Figure 1 to Figure 2 A circular rotary drilling device for large-diameter cast-in-place concrete pipe piles includes a frame 7 connected to an external engineering machinery and an auger 3, an inner tube 6 and an outer tube 5 respectively connected to the frame 7.

[0026] Specifically, in this embodiment, the auger 3 is slidably connected to the frame 7 through the auger lifting mechanism 1, and the inner cylinder 6 is connected to the above-mentioned auger lifting mechanism 1 through the power mechanism 2; it can be understood that personnel can realize the movement of the auger 3 and the inner cylinder 6 by controlling the auger lifting mechanism 1 and the power mechanism 2.

[0027] In this embodiment, the outer cylinder 5 is slidably connected to the frame 7 through the outer cylinder lifting mechanism 4. Accordingly, personnel can move the outer cylinder 5 through the outer cylinder lifting mechanism 4. The outer cylinder lifting mechanism 4 is located below the auger lifting mechanism 1 and is used to independently control the lifting of the outer cylinder 5. After the concrete pouring is completed, the pipe is vibrated to form a pile.

[0028] In order to ensure the quality of pile formation, in this embodiment, the outer part of the auger 3 is sequentially sleeved with an inner tube 6 and an outer tube 5, and the auger 3, the inner tube 6, and the outer tube 5 are concentrically arranged.

[0029] In this embodiment, the power equipment 2 includes an inner cylinder separation hydraulic cylinder 21 and a power head 22; wherein the inner cylinder separation hydraulic cylinder 21 is fixedly connected to the upper end of the inner cylinder 6, and is used to control the sinking of the inner cylinder 6; when the equipment drills to a specified depth, the inner cylinder separation hydraulic cylinder 21 is started to sink the inner cylinder 6, and the inner cylinder separation hydraulic cylinder 21 forcibly squeezes the inner cylinder 6 into the soil and fixes it, thereby preventing the inner cylinder 6 from being pulled out or the bottom shaking when the auger 3 is lifted.

[0030] In this embodiment, the power head 22 is connected to the auger 3. The power head 22 converts hydraulic energy into mechanical energy and then outputs the rotation speed and torque to transmit to the auger 3, thereby driving the auger 3 to rotate.

[0031] In this embodiment, multiple groups of spiral blades 31 are arranged around the outside of the auger 3; specifically, the spiral blades 31 are welded to the outside of the auger 3, and two groups of cutter head assemblies are arranged at the end of the spiral blades 31, each group of cutter head assemblies includes 2 alloy teeth 33 and 1 eccentric alloy tooth 32; wherein the eccentric alloy tooth 32 is arranged on the outside of the alloy tooth 33.

[0032] In actual work, the eccentric alloy teeth 32 are located at the outermost side and can rotate. The eccentric alloy teeth 32 rotate simultaneously with the rotation of the auger 3. The steel body around the axial line of the eccentric alloy teeth 32 drill bit is asymmetrically distributed, so that the center of the drill bit deviates from the axial line of the drill bit. When the drill bit rotates, a lateral force (centrifugal force) is generated to cut the hole wall and expand the hole diameter. When the eccentric alloy teeth 32 rotate to the outside, the distance from the outside to the center of the auger 3 is greater than the radius of the outer cylinder 5, so that the rotation excavation diameter of the auger 3 is greater than the diameter of the outer cylinder 5, thereby ensuring that the outer cylinder sinks smoothly, so that the outer cylinder 5, the auger 3 and the inner cylinder 6 are pressed down synchronously for drilling.

[0033] In this embodiment, when the diameter of the outer cylinder 5 is 1000 mm, the diameter of the inner cylinder 6 is 700 mm, and the distance between the outer cylinder 5 and the inner cylinder 6 is 150 mm, the spiral pitch of the auger 3 is 400 mm, and the spiral height is 110 mm.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A circular rotary drilling device for large-diameter cast-in-place concrete piles, characterized in that: The invention comprises a frame (7), an auger (3), an outer cylinder (5) and an inner cylinder (6); the auger (3) is movably connected to the frame (7) via an auger lifting mechanism (1); the inner cylinder (6) is connected to the auger lifting mechanism (1) via a power mechanism (2); the outer cylinder (5) is movably connected to the frame (7) via an outer cylinder lifting mechanism (4); The auger (3), the outer cylinder (5) and the inner cylinder (6) are arranged concentrically.

2. The cast-in-place concrete large-diameter pipe pile annular rotary drilling device according to claim 1, characterized in that: The auger (3) is surrounded by a plurality of groups of spiral blades (31); the plurality of groups of spiral blades (31) are arranged in series; A cutter head assembly is provided at the end of the spiral blade (31), and the cutter head assembly comprises a plurality of alloy teeth (33).

3. The cast-in-place concrete large-diameter pipe pile annular rotary drilling device according to claim 2, characterized in that: An eccentric alloy tooth (32) is arranged outside the plurality of alloy teeth (33); When the eccentric alloy tooth (32) rotates to the outside, the distance between the eccentric alloy tooth (32) and the center of the spiral drill (3) is greater than the radius of the outer cylinder (5).

4. The cast-in-place concrete large-diameter pipe pile annular rotary drilling device according to claim 1, characterized in that: The power mechanism (2) comprises an inner cylinder separation hydraulic cylinder (21) and a power head (22); The inner cylinder separation hydraulic cylinder (21) is fixedly connected to the inner cylinder (6) and is used to control the inner cylinder (6) to sink; the power head (22) is connected to the auger (3) and is used to drive the auger (3) to rotate.

5. The annular rotary drilling device for large-diameter cast-in-place concrete pipe piles according to claim 1, characterized in that: The outer cylinder (5) has a diameter of 1000 mm, the inner cylinder (6) has a diameter of 700 mm, and the distance between the outer cylinder (5) and the inner cylinder (6) is 150 mm; The spiral pitch of the auger (3) is 400 mm, and the spiral height is 110 mm.

6. The annular rotary drilling device for large-diameter cast-in-place concrete pipe piles according to claim 3 is characterized in that: The number of the cutter head assemblies provided is two groups; each group of the cutter head assemblies comprises two of the alloy teeth (33) and one of the eccentric alloy teeth (32).

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