Mechanical rotary excavating expanded bore pile hole cleaning device and construction method

Abstract

The invention provides a mechanical rotary excavating expanded bore pile hole cleaning device and a construction method, the device comprises a plurality of hole cleaning petals I, the plurality of hole cleaning petals I are movably connected to form a cylindrical hole cleaning structure, and a scraper I is arranged on the outer wall of the cylindrical hole cleaning structure; the multiple second hole cleaning petals are movably connected to form an inverted-cone-shaped hole cleaning structure arranged at the bottom of the cylindrical hole cleaning structure, and a second scraper is arranged on the outer wall of the inverted-cone-shaped hole cleaning structure; and the folding and unfolding assembly is located in the cylindrical hole cleaning structure and used for driving the first hole cleaning valve to fold and unfold in the radial direction of the cylindrical hole cleaning structure or driving the second hole cleaning valve to fold and unfold in the radial direction of the inverted-cone-shaped hole cleaning structure. According to the method, the cylindrical hole cleaning structure and the inverted-cone-shaped hole cleaning structure are folded and unfolded, so that muck in the expanded-diameter section in the expanded-base pile hole is cleaned, and the bearing capacity of a pile foundation in follow-up construction can be improved; and through the design of the folding and unfolding assembly, the linkage performance of the first hole cleaning valve and the second hole cleaning valve is enhanced, and the hole cleaning construction efficiency can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of pile hole cleaning equipment, and in particular to a mechanical rotary excavation and bottom enlargement pile hole cleaning device and a construction method. Background Art

[0002] Mechanical rotary drilling and bottom expansion piles are a new type of pile foundation construction method. A rotary drilling rig is used to drill holes in the pile body. After reaching the designed pile foundation depth, the rotary drilling bit is replaced with a bottom expansion bit to form a pot-bottom-shaped expansion head at the bottom of the pile body. Finally, the slag at the bottom of the pile is cleaned to complete the hole formation of the pile foundation. Then, the steel cage and concrete pouring operations are carried out to finally complete the construction of the pile foundation. Compared with ordinary cast-in-place piles, rotary drilling and bottom expansion piles can effectively utilize the strength of the pile body concrete and the advantage of the larger area of ​​the expansion head to provide greater foundation bearing capacity, reduce pile length, and save investment.

[0003] The thickness of the sediment at the bottom of the hole is the key point of quality control for mechanically bored piles. According to regulations, before pouring concrete, the thickness of the sediment at the bottom of the hole for end-bearing piles should not be greater than 50mm. For non-bottom-expanded bored piles, a hole cleaner is generally used to clean the hole after the hole is completed. The sediment at the bottom of the pile meets the design requirements by cleaning the hole several times. However, for bored piles with bottom expansion, the traditional hole cleaner can only clean the sediment within the diameter range of the pile body, but cannot effectively clean the sediment at the expanded head, resulting in a large sediment thickness at the expanded head outside the diameter range of the pile body, which seriously affects the bearing capacity of the pile foundation. Summary of the invention

[0004] The object of the present invention is to provide a mechanical rotary excavation and bottom expansion pile hole cleaning device and a construction method to solve the above-mentioned problems.

[0005] The technical solution adopted by the present invention is: a mechanical rotary excavation and bottom pile cleaning device, which comprises:

[0006] A hole cleaning flap 1, wherein a plurality of the hole cleaning flaps 1 are movably connected to form a cylindrical hole cleaning structure, and a scraper 1 is provided on the outer wall of the cylindrical hole cleaning structure;

[0007] A second hole cleaning flap, wherein a plurality of the second hole cleaning flaps are movably connected to form an inverted cone hole cleaning structure disposed at the bottom of the cylindrical hole cleaning structure, and a second scraper is disposed on the outer wall of the inverted cone hole cleaning structure;

[0008] The retracting and extending component is located inside the cylindrical hole cleaning structure, and is used to drive the hole cleaning petal 1 to retract and extend along the radial direction of the cylindrical hole cleaning structure, or to drive the hole cleaning petal 2 to retract and extend along the radial direction of the inverted cone hole cleaning structure.

[0009] Furthermore, the retraction and expansion assembly includes a telescope, a movable guide rod and a sliding sleeve, the telescope is arranged on the top of the cylindrical hole cleaning structure; the movable guide rod is coaxially arranged inside the cylindrical hole cleaning structure, and the top end is connected to the telescope; the sliding sleeve is sleeved on the bottom end of the movable guide rod; the hole cleaning petal 1 and the hole cleaning petal 2 are connected to the movable guide rod and the sliding sleeve through a movable connecting rod.

[0010] Furthermore, the movable connecting rod comprises:

[0011] A movable connecting rod 1, two ends of which are rotatably connected to the movable guide rod and the hole cleaning flap 1;

[0012] A second movable connecting rod, two ends of which are rotatably connected to the first hole cleaning flap and the sliding sleeve;

[0013] A movable connecting rod three, two ends of which are rotatably connected to the sliding sleeve and the hole cleaning flap two.

[0014] Furthermore, the movable connecting rod three is a telescopic rod, and the top end of the hole cleaning flap two is rotatably connected to the bottom end of the hole cleaning flap one.

[0015] Furthermore, a mounting seat is arranged at the top end of the cylindrical hole cleaning structure, the retracting and extending component is partially arranged on the mounting seat, and the top end of the hole cleaning petal 1 is rotatably connected to the bottom end of the mounting seat.

[0016] Furthermore, a connecting block is arranged on the mounting seat, and the connecting block can be detachably connected to the drill rod of the rotary drilling rig.

[0017] Furthermore, a plurality of scrapers 1 are distributed along the circumference of the cylindrical hole cleaning structure, and the ends of the scrapers 1 away from the hole cleaning flap 1 extend along the tangent direction of the cylindrical hole cleaning structure.

[0018] Furthermore, a plurality of scrapers 2 are distributed along the circumference of the inverted cone hole cleaning structure, and the ends of the scrapers 2 away from the hole cleaning petal 2 extend along the tangent direction of the inverted cone hole cleaning structure.

[0019] Furthermore, a slag collecting hole is arranged on the second hole cleaning petal, and two ends of the slag collecting hole are respectively connected to the inner and outer sides of the inverted cone hole cleaning structure.

[0020] The technical solution of the present invention also includes: a construction method using the mechanical rotary excavation and bottom pile cleaning device as described above, comprising the steps of:

[0021] S1. Connect the hole cleaning device to the drill rod of the rotary drilling rig, and use the drill rod of the rotary drilling rig to lower the hole cleaning device into the bottom-enlarged pile hole;

[0022] S1. When the hole cleaning device is located at the equal diameter section of the bottom expanded pile hole, the drilling rod of the rotary drilling rig rotates the hole cleaning device and uses the scraper on the outer wall of the cylindrical hole cleaning structure to scrape off the debris in the equal diameter section;

[0023] S1. When the hole cleaning device is located at the diameter expansion section of the bottom-enlarged pile hole, the hole cleaning flap 1 and the hole cleaning flap 2 are unfolded by the retracting and unfolding assembly, the hole cleaning device is rotated by the drill rod of the rotary drilling rig, the scraper 1 is used to scrape off the slag in the diameter expansion section, and the scraper 2 is used to scrape off the slag at the bottom of the bottom-enlarged pile hole, and the slag enters the inner side of the inverted cone-shaped hole cleaning structure through the slag collection hole;

[0024] S4, using the retracting and expanding assembly to retract the hole cleaning flap 1 and the hole cleaning flap 2, using the rotary drilling rig drill rod to lift the hole cleaning device out of the bottom expanded pile hole, after removing the slag, repeat steps S1 to S4 until the hole cleaning operation is completed.

[0025] The beneficial effects of the present invention are as follows: by means of the retractable and deployable cylindrical hole cleaning structure and the inverted cone hole cleaning structure, the debris in the expanded diameter section of the expanded bottom pile hole can be cleaned, thereby improving the bearing capacity of the pile foundation of subsequent construction; by means of the special design of the retractable and deployable components, the linkage between the hole cleaning petal one and the hole cleaning petal two is enhanced, thereby reducing the difficulty of operating the hole cleaning device and improving the efficiency of the hole cleaning construction; by means of the configuration of the retractable and deployable components and the movable connecting rod three, the hole cleaning device can be used to clean the holes of rotary-drilled and expanded bottom piles of different diameters, thereby improving the universality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is an overall structural diagram of an embodiment of the present invention;

[0027] Figure 2 Schematic diagram of the expansion process of the cylindrical hole cleaning structure and the inverted cone hole cleaning structure in the embodiment of the present invention;

[0028] Figure 3 Schematic diagram of the shrinkage process of the cylindrical hole cleaning structure and the inverted cone hole cleaning structure in the embodiment of the present invention;

[0029] Figure 4 2 is a top view schematic diagram of a cylindrical hole cleaning structure in an embodiment of the present invention;

[0030] Figure 5 2 is a schematic top view of an inverted cone hole cleaning structure according to an embodiment of the present invention;

[0031] Figure 6 The embodiment of the present invention is attached Figure 5 AA' section diagram;

[0032] Figure 7 The embodiment of the present invention is attached Figure 6 Schematic diagram of the BB' section.

[0033] In the figure:

[0034] 1. Cylindrical hole cleaning structure; 11. One hole cleaning flap; 12. One scraper;

[0035] 2. Inverted cone hole cleaning structure; 21. Second hole cleaning flap; 22. Second scraper; 23. Slag collection hole;

[0036] 3. Retractable assembly; 31. Telescopic device; 32. Movable guide rod; 33. Sliding sleeve; 34. Movable connecting rod 1; 35. Movable connecting rod 2; 36. Movable connecting rod 3;

[0037] 4. Mounting seat;

[0038] 5. Connect the blocks. DETAILED DESCRIPTION

[0039] The technical solutions of the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0040] In the description of the embodiments of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "top", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, 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, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "set" and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0041] Reference Figure 1-7The embodiment of the present invention provides a mechanical rotary drilling and bottom expansion pile hole cleaning device, which includes: a hole cleaning flap 11, a hole cleaning flap 21, a scraper 12, a scraper 22, a retracting and unfolding assembly 3, a mounting seat 4 and a connecting block 5, wherein the hole cleaning flap 11 and the hole cleaning flap 21 are respectively configured with a plurality of holes, the top end of the hole cleaning flap 11 is rotatably connected to the bottom end of the mounting seat 4, and a plurality of hole cleaning flaps 11 are arranged at the bottom of the mounting seat 4 to form a cylindrical hole cleaning structure 1, and the scraper 12 is arranged on the outer wall of the cylindrical hole cleaning structure 1; the top end of the hole cleaning flap 21 is rotatably connected to the bottom end of the hole cleaning flap 11, and a plurality of hole cleaning flaps 21 are arranged at the bottom of the cylindrical hole cleaning structure 1 to form an inverted cone hole cleaning structure 2, and the scraper 22 is arranged on the inverted cone hole cleaning structure On the outer wall of the structure 2, in addition, a slag collection hole 23 is also provided on the hole cleaning petal 21, and the two ends of the slag collection hole 23 are respectively connected to the inner and outer sides of the inverted cone hole cleaning structure 2; the retraction and expansion component 3 is partially arranged on the mounting seat 4, and partially extends into the cylindrical hole cleaning structure 1, and is used to drive the hole cleaning petal 11 to retract and expand along the radial direction of the cylindrical hole cleaning structure 1, or drive the hole cleaning petal 21 to retract and expand along the radial direction of the inverted cone hole cleaning structure 2; the connecting block 5 is located at the top of the mounting seat 4, and is detachably connected to the drill rod of the rotary drilling rig. Its specific structural shape can be selected by those skilled in the art, and no more specific limitation is made here. For example, the connecting block 5 in this embodiment can be designed with reference to the structural shape of the rotary drilling rig drill bit used to connect the drill rod of the rotary drilling rig.

[0042] When the hole cleaning device is used to clean the bottom pile hole, the connecting block 5 is first connected to the drill rod of the rotary drilling rig, and the hole cleaning device is lowered into the bottom pile hole by the drill rod of the rotary drilling rig. The hole cleaning device first passes through the equal-diameter section of the bottom pile hole. At this time, the hole cleaning device is rotated by the drill rod of the rotary drilling rig, and the scraper 12 on the outer wall of the cylindrical hole cleaning structure 1 is used to scrape off the debris in the equal-diameter section; then the hole cleaning device is continued to be lowered to the expanded diameter section of the bottom pile hole, and the retracting and unfolding component 3 is started to drive the hole cleaning petal 11 to expand radially along the cylindrical hole cleaning structure 1, and drive the hole cleaning petal 21 to expand radially along the inverted cone hole cleaning structure 2. At this time, the hole cleaning device is rotated by the drill rod of the rotary drilling rig, and the cylindrical hole cleaning structure 1 is used to clean the hole. The scraper 12 on the outer wall of the structure 1 scrapes off the debris in the expanded diameter section, and the scraper 22 on the outer wall of the inverted cone hole cleaning structure 2 scrapes off the debris at the bottom of the pile hole, so that the debris that falls into the pile bottom in the previous stage and is originally at the bottom of the pile passes through the debris collection hole 23 on the hole cleaning flap 21 and enters the inner side of the inverted cone hole cleaning structure 2; finally, the retraction and expansion component 3 is started to drive the hole cleaning flap 11 to shrink and reset along the radial direction of the cylindrical hole cleaning structure 1, and drive the hole cleaning flap 21 to shrink and reset along the radial direction of the inverted cone hole cleaning structure 2, so as to leave the debris in the hole cleaning device, and use the rotary drilling rig drill rod to lift the hole cleaning device out of the expanded bottom pile hole, and repeat the above actions after removing the debris until the hole cleaning operation is completed.

[0043] By adopting the above device, the cylindrical hole cleaning structure 1 and the inverted cone hole cleaning structure 2 can be retracted and expanded to clean the debris in the expanded diameter section of the bottom-enlarged pile hole, thereby improving the bearing capacity of the pile foundation in subsequent construction.

[0044] Reference Figure 2-3 The retracting and extending assembly 3 includes a telescopic device 31, a movable guide rod 32 and a sliding sleeve 33. The telescopic device 31 is arranged at the top of the cylindrical hole cleaning structure 1, and its telescopic end faces the inner side of the cylindrical hole cleaning structure 1; the movable guide rod 32 is coaxially arranged inside the cylindrical hole cleaning structure 1, and the top end is connected to the telescopic device 31; the sliding sleeve 33 is sleeved on the bottom end of the movable guide rod 32; the hole cleaning flap 1 11 and the hole cleaning flap 21 are connected to the movable guide rod 32 and the sliding sleeve 33 through a movable connecting rod. The telescopic device 31 is extended and retracted to drive the hole cleaning flap 1 11 and the hole cleaning flap 2 21 to retract and extend.

[0045] More specifically, the movable link includes: a movable link 1 34, a movable link 2 35 and a movable link 3 36. The two ends of the movable link 1 34 are respectively rotatably connected to the movable guide rod 32 and the hole cleaning flap 1 11, the two ends of the movable link 2 35 are respectively rotatably connected to the hole cleaning flap 1 11 and the sliding sleeve 33, and the two ends of the movable link 36 are respectively rotatably connected to the sliding sleeve 33 and the hole cleaning flap 21. Figure 2-3 In some preferred technical solutions, the top of the movable link 1 34 faces the movable guide rod 32, the top of the movable link 2 35 faces the hole cleaning flap 11, and the top of the movable link 3 36 faces the sliding sleeve 33. The movable link 3 36 is preferably a telescopic rod. When it is necessary to retract and expand the hole cleaning flap 11 and the hole cleaning flap 21, it is preferred to link the telescopic device 31 and the movable connecting rod 36 to extend the telescopic device 31 and the movable connecting rod 36, respectively drive the movable guide rod 32 to move downward, drive the sliding sleeve 33 to move upward, and drive the hole cleaning flap 21 to move radially outward along the inverted cone-shaped hole cleaning structure 2; under the coordinated action of the movable guide rod 32 and the sliding sleeve 33, the top end of the movable connecting rod 1 34 moves downward, and the bottom end of the movable connecting rod 2 35 moves upward, thereby driving the hole cleaning flap 1 11 to move radially outward along the cylindrical hole cleaning structure 1, thereby realizing the expansion action of the hole cleaning flap 11 and the hole cleaning flap 21; the contraction action of the hole cleaning flap 11 and the hole cleaning flap 21 is opposite to the above process, which will not be repeated here.

[0046] In order to realize the linkage control of the telescopic device 31 and the movable link 36, the telescopic device 31 can be selected as a hydraulic cylinder or other equipment, and the movable link 36 can be selected as an electric telescopic rod or other equipment, and automatically controlled by a solenoid valve, a programmable system controller, etc.

[0047] Reference Figure 4-7 There are several scrapers 12 distributed along the circumference of the cylindrical hole cleaning structure 1, and the end of the scraper 12 away from the hole cleaning petal 11 extends along the tangential direction of the cylindrical hole cleaning structure 1; there are several scrapers 22 distributed along the circumference of the inverted cone hole cleaning structure 2, and the end of the scraper 22 away from the hole cleaning petal 21 extends along the tangential direction of the inverted cone hole cleaning structure 2, so as to clean the debris in the pile hole efficiently and with high quality.

[0048] Compared with the prior art, the beneficial effects of the present invention are as follows: by retracting and deploying the cylindrical hole cleaning structure 1 and the inverted cone hole cleaning structure 2, the debris in the expanded diameter section of the expanded bottom pile hole can be cleaned, thereby improving the bearing capacity of the pile foundation of subsequent construction; by the special design of the retracting and deploying component 3, the linkage between the hole cleaning flap 11 and the hole cleaning flap 21 is enhanced, the operating difficulty of the hole cleaning device can be reduced, and the efficiency of the hole cleaning construction can be improved; through the configuration of the retracting and deploying component 3 and the movable connecting rod 3 36, the hole cleaning device can be used to clean the holes of rotary drilled and expanded bottom piles of different diameters, thereby improving the universality of the device.

[0049] 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.

[0050] The above are preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A mechanical rotary excavation and bottom pile cleaning device, characterized in that: include: A hole cleaning flap 1, wherein a plurality of the hole cleaning flaps 1 are movably connected to form a cylindrical hole cleaning structure, and a scraper 1 is provided on the outer wall of the cylindrical hole cleaning structure; A second hole cleaning flap, wherein a plurality of the second hole cleaning flaps are movably connected to form an inverted cone hole cleaning structure disposed at the bottom of the cylindrical hole cleaning structure, and a second scraper is disposed on the outer wall of the inverted cone hole cleaning structure; The retracting and extending component is located inside the cylindrical hole cleaning structure, and is used to drive the hole cleaning petal 1 to retract and extend along the radial direction of the cylindrical hole cleaning structure, or to drive the hole cleaning petal 2 to retract and extend along the radial direction of the inverted cone hole cleaning structure.

2. The mechanical rotary drilling and bottom pile clearing device according to claim 1 is characterized in that: The retractable and extendable assembly includes a telescope, a movable guide rod and a sliding sleeve, wherein the telescope is arranged on the top of the cylindrical hole cleaning structure; the movable guide rod is coaxially arranged inside the cylindrical hole cleaning structure, and the top end is connected to the telescope; the sliding sleeve is sleeved on the bottom end of the movable guide rod; the first hole cleaning petal and the second hole cleaning petal are connected to the movable guide rod and the sliding sleeve through a movable connecting rod.

3. The mechanical rotary drilling and bottom pile clearing device according to claim 2 is characterized in that: The movable connecting rod comprises: A movable connecting rod 1, two ends of which are rotatably connected to the movable guide rod and the hole cleaning flap 1; A second movable connecting rod, two ends of which are rotatably connected to the first hole cleaning flap and the sliding sleeve; A movable connecting rod three, two ends of which are rotatably connected to the sliding sleeve and the hole cleaning flap two.

4. The mechanical rotary drilling and bottom pile clearing device according to claim 3 is characterized in that: The movable connecting rod three is a telescopic rod, and the top end of the hole cleaning flap two is rotatably connected to the bottom end of the hole cleaning flap one.

5. The mechanical rotary drilling and bottom pile clearing device according to any one of claims 1 to 4, characterized in that: A mounting seat is arranged at the top end of the cylindrical hole cleaning structure, the retracting and extending component is partially arranged on the mounting seat, and the top end of the hole cleaning petal 1 is rotatably connected to the bottom end of the mounting seat.

6. The mechanical rotary drilling and bottom pile clearing device according to claim 5 is characterized in that: A connecting block is arranged on the mounting seat, and the connecting block can be detachably connected to the drill rod of the rotary drilling rig.

7. The mechanical rotary drilling and bottom pile cleaning device according to any one of claims 1 to 4 and 6, characterized in that: A plurality of scrapers 1 are distributed along the circumference of the cylindrical hole cleaning structure, and the ends of the scrapers 1 away from the hole cleaning flap 1 extend along the tangent direction of the cylindrical hole cleaning structure.

8. The mechanical rotary drilling and bottom pile clearing device according to claim 7 is characterized in that: A plurality of scrapers 2 are distributed along the circumference of the inverted cone hole cleaning structure, and the ends of the scrapers 2 away from the hole cleaning petal 2 extend along the tangent direction of the inverted cone hole cleaning structure.

9. The mechanical rotary drilling and bottom pile cleaning device according to any one of claims 1-4, 6 and 8, characterized in that: The second hole cleaning petal is provided with a slag collecting hole, and the two ends of the slag collecting hole are respectively connected with the inner and outer sides of the inverted cone hole cleaning structure.

10. A construction method using the mechanical rotary excavation and bottom pile clearing device according to claim 9, characterized in that: Includes steps: S1. Connect the hole cleaning device to the drill rod of the rotary drilling rig, and use the drill rod of the rotary drilling rig to lower the hole cleaning device into the bottom-enlarged pile hole; S1. When the hole cleaning device is located at the equal diameter section of the bottom expanded pile hole, the drilling rod of the rotary drilling rig rotates the hole cleaning device and uses the scraper on the outer wall of the cylindrical hole cleaning structure to scrape off the debris in the equal diameter section; S1. When the hole cleaning device is located at the diameter expansion section of the bottom-enlarged pile hole, the hole cleaning flap 1 and the hole cleaning flap 2 are unfolded by the retracting and unfolding assembly, the hole cleaning device is rotated by the drill rod of the rotary drilling rig, the scraper 1 is used to scrape off the slag in the diameter expansion section, and the scraper 2 is used to scrape off the slag at the bottom of the bottom-enlarged pile hole, and the slag enters the inner side of the inverted cone-shaped hole cleaning structure through the slag collection hole; S4, using the retracting and expanding assembly to retract the hole cleaning flap 1 and the hole cleaning flap 2, using the rotary drilling rig drill rod to lift the hole cleaning device out of the bottom expanded pile hole, after removing the slag, repeat steps S1 to S4 until the hole cleaning operation is completed.

Images