Drilling pouring pile head construction device and construction method thereof

Abstract

The invention relates to a drilling and pouring pile head construction device which comprises a partition plate, and the lower end face of the partition plate and the designed elevation of a pile head are located on the same horizontal plane. A pouring opening is formed in the middle of the partition plate, the upper portion of the pile foundation reinforcement cage penetrates through the pouring opening, supporting plates abutting against the lower end face of the partition plate are fixed to the multiple pile foundation main reinforcements, the portions, above the partition plate, of the pile foundation main reinforcements are sleeved with partition devices, and the partition devices are used for separating concrete from the portions, above the partition plate, of the pile foundation main reinforcements. An annular sleeve is mounted on the upper end face of the partition plate through bolts, a circle of mounting holes are annularly formed in the periphery of the annular sleeve in an array mode, the mounting holes correspond to pile foundation main ribs above the partition plate one to one, steel chisels are inserted into the mounting holes and extend inwards to the position close to the central axis of the partition plate, and the pile head part can be broken and removed rapidly.

Description

Technical Field

[0001] The invention relates to a bored pile head construction device and a construction method thereof, belonging to the technical field of bored pile construction. Background Art

[0002] During the pile head removal process, the elevation line of the pile top is surveyed and mapped. The holes for the pile head removal are all opened after the concrete is poured. This can lead to inaccuracies in the cutting and drilling process. Furthermore, the installation, operation, and removal of the concrete cutter and rock drill are cumbersome and slow, posing certain safety risks.

[0003] The existing pile head removal process will add a sleeve to the surface of the steel bars on the upper part of the pile foundation steel cage to separate the concrete and the steel bars. However, the conventional sleeve has a poor separation effect on the concrete and the steel bars. Some concrete will sink into the surface of the steel bars from the bottom of the sleeve. Therefore, during the process of peeling the pile head, the pile head and the concrete will solidify into one. It is easy to cause the steel bars to be straightened when they are peeled out of the concrete. This is done manually with a steel bar wrench to manually straighten each steel bar one by one. However, the steel bars are hard and have irregular bending directions, which is very laborious and requires a lot of work time.

[0004] For example, Chinese patent CN116804325A discloses a bored pile head construction method, which uses a jackhammer to break concrete and bend any steel bars. These steel bars need to be straightened one by one in the later stage, resulting in low efficiency in pile head construction and room for improvement.

[0005] Therefore, it is of great significance to improve the existing bored pile structure so that the steel bars can be smoothly separated from the concrete during the pile head removal process and the steel bars remain unchanged after being lifted off the pile head. Summary of the Invention

[0006] In order to solve the above problems existing in the prior art, the present invention provides a bored pile head construction device and a construction method thereof, which can quickly achieve the breaking of the pile head part and keep the steel bar unchanged after being lifted off the pile head.

[0007] The technical solutions of the present invention are as follows:

[0008] A bored and cast-in-place pile head construction device comprises a partition, wherein the lower end face of the partition is at the same horizontal plane as the design elevation of the pile head; a grouting port is provided in the middle of the partition, the upper part of the pile foundation steel cage passes through the grouting port, a plurality of pile foundation main bars are fixed with support plates abutting against the lower end face of the partition, the pile foundation main bars above the partition are all sleeved with a separator, the separator is used to separate the concrete and the pile foundation main bars above the partition; an annular sleeve is installed on the upper end face of the partition by bolts, and a circle of mounting holes is provided in an circumferential array on the outer periphery of the annular sleeve, the mounting holes correspond one to one with the pile foundation main bars above the partition, a steel chisel is inserted into the mounting hole, and the steel chisel extends inward to the center axis of the adjacent partition.

[0009] In which, the separating device includes a locking sleeve and a nut, the lower end of the locking sleeve is flush with the upper surface of the partition, and a partition opening is provided at three equal intervals on the lower end of the locking sleeve. The three partition openings divide the lower end of the locking sleeve into three elastic sheets, and the interior of the partition opening is filled with a plastic elastic film. The inner wall of the locking sleeve is provided with an anti-slip protrusion, and the outer walls of the three elastic sheets are provided with inwardly concave cutting openings; a protrusion that fits the cutting opening is provided on the inner wall of the nut; when the protrusion is misaligned with the cutting opening, the elastic sheet is used to clamp the main reinforcement of the pile foundation above the partition through the nut protrusion; when the protrusion fits with the cutting opening, a gap is left between the elastic sheet and the main reinforcement of the pile foundation above the partition.

[0010] Among them, the injection port is located at the center of the partition, and a circle of fastening components are arranged in an array on the outer periphery of the injection port. The fastening components include two threaded tubes threadedly connected to the inner side of the partition, and the ends of the threaded tubes are rotatably connected to the connecting tubes. Arc plates are fixedly arranged on the opposite side of the two connecting tubes and on the outer periphery of the injection port located between the two threaded tubes. The two arc plates are arranged facing each other, and a clamping space is formed inside the two arc plates for stabilizing and quickly positioning the main reinforcement of the pile foundation.

[0011] Among them, an adjustment component is provided between the two arc-shaped plates arranged opposite to each other, and the adjustment component includes a plurality of arc-shaped sheets and a plurality of elastic silicones. The plurality of arc-shaped sheets and the plurality of elastic silicones are staggered and connected to form an arc-shaped surface. The outer arc surface of the arc-shaped surface matches the inner arc surface of the arc-shaped plate, and a plurality of springs are fixedly connected between the arc-shaped surface and the arc-shaped plate.

[0012] Wherein, the steel drill is arranged to be inclined upward by 3° to 5°.

[0013] Wherein, a drag rod is fixedly connected to the inner wall of the annular sleeve, and the other end of the drag rod is fixedly connected to the locking sleeve.

[0014] The length of the steel drill inserted into the annular sleeve is less than the radius of the annular sleeve but greater than half of the radius.

[0015] Wherein, a ring edge is provided on the outer periphery of the partition, and a hanging ring is passed through the ring edge.

[0016] A bored pile head construction method is constructed using a bored pile head construction device according to any one of claims 1 to 8, specifically comprising the following steps:

[0017] S1: Construction of bored piles, fabrication of reinforcement cages and lowering of piles; according to design requirements, determination of elevations, selection of a suitable drilling rig for bored piles, excavation and hole cleaning, inspection of hole depth, hole position, hole diameter, inclination, etc., and after verification, support of the diaphragm on the main reinforcement of the pile foundation reinforcement cage with a support plate. Accurately determine the location where the pile head needs to be broken after bored pile construction, ensuring that the lower end surface of the diaphragm is at the same level as the designed elevation of the pile head, transporting the pile foundation reinforcement cage to the completed bored pile location, and lowering and preliminarily securing the pile foundation reinforcement cage;

[0018] S2: Install the annular sleeve and the steel chisel; fix the annular sleeve to the top of the partition with bolts, and insert the steel chisel into the mounting hole of the annular sleeve;

[0019] S3: Install the locking sleeve; install a vertical locking sleeve on the pile foundation main reinforcement, with the lower end of the locking sleeve abutting against the upper surface of the partition. At the same time, squeeze the elastic sheet and adjust the position of the nut on the locking sleeve so that the protrusion of the nut is misaligned with the cutting edge. The elastic sheet can then clamp the pile foundation main reinforcement above the partition through the protrusion of the nut;

[0020] S4: pouring concrete; lowering the conduit required for the pile casting through the pouring port of the partition, and pouring the pile concrete according to the construction plan, with the height of the poured concrete being between the upper end of the partition and the upper end of the locking sleeve;

[0021] S5: Separate the part of the pile to be broken; after the pile foundation concrete has initially set, the soil around the pile foundation can be excavated, and then the steel drill is repeatedly struck to make the steel drill sink into the concrete. The length of the steel drill penetrating into the concrete is greater than half the radius of the annular sleeve. The upward squeezing force generated by the wedge-shaped tail of the steel drill is used to separate the pile head and the pile foundation;

[0022] S6: Move the separated pile head away; after the pile head is separated from the pile foundation, separate the fixings related to the partition and the support plate, loosen the partition again, use a crane to hang the lifting ring, and lift out the broken pile head.

[0023] Wherein, in step S1:

[0024] When the partition is placed on the support plate, the main reinforcement of the pile foundation steel cage passes through the clamping space formed inside the two curved plates. At the same time, the rotating threaded tube drives the two curved plates to fit tightly together, further clamping the main reinforcement of the pile foundation and keeping it vertical.

[0025] The present invention has the following beneficial effects:

[0026] This device is provided with a locking sleeve which is sleeved on the outer wall of the steel bar, and cooperates with the three elastic sheets at the bottom through a nut to squeeze the three elastic sheets until they are completely in contact with the surface of the steel bar. At the same time, the plastic elastic membrane provided at the partition opening is squeezed inward by the three elastic sheets and then stretched and wrapped around the surface of the steel bar, which can effectively avoid the problem of the interior of the locking sleeve being doomed by concrete, and also avoid the problem of the locking sleeve floating up during the concrete pouring process, causing it to shift upward along the steel bar. At the same time, due to the rigidity of the locking sleeve, it can remain relatively vertical during the process of stripping the pile head, avoiding the need for steel bar straightening when the steel bar is stripped from the concrete.

[0027] The device also provides two opposite curved plates on the surface of the steel bar, clamps the steel bar through the curved plates, and further maintains a certain verticality of the steel bar through the curved plates during the process of stripping the pile head. The friction between the curved plates and the surface of the steel bar can scrape off the concrete residue remaining on the surface of the steel bar. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the lock sleeve structure of the present invention;

[0030] Figure 3 This is a schematic diagram of the installation of the lock sleeve of the present invention;

[0031] Figure 4 A top view of the partition of the present invention;

[0032] Figure 5 This is a schematic diagram of the structure of the regulating component of the present invention;

[0033] Figure 6 It is a partial cross-sectional view of the steel drill of the present invention;

[0034] Figure 7 It is a schematic diagram of the cam structure of the present invention.

[0035] The reference numerals in the figures are as follows:

[0036] 1. Partition; 2. Locking sleeve; 3. Nut; 4. Threaded pipe; 11. Filling port; 12. Annular sleeve; 13. Ring edge; 14. Lifting ring; 15. Drag rod; 21. Partition port; 22. Elastic sheet; 23. Plastic elastic membrane; 24. Cutting port; 41. Connecting tube; 42. Arc plate; 43. Arc sheet; 44. Elastic silicone; 45. Arc surface; 46. Spring; 121. Mounting hole; 51. Top seat; 52. Drill body; 521. Upper drill body; 522. Lower drill body; 61. Telescopic rod; 62. Spring; 63. Drive rod; 64. Driving pulley; 65. Belt; 66. Driven pulley; 67. Rotating shaft; 68. Cam. DETAILED DESCRIPTION

[0037] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] See also Figures 1 to 5 , the invention provides a technical solution:

[0039] A bored pile head construction device includes a partition 1, the lower end surface of the partition 1 being at the same horizontal plane as the designed elevation of the pile head; a pouring port 11 is provided in the middle of the partition 1, the upper portion of the pile foundation reinforcement cage passes through the pouring port 11, a plurality of pile foundation main reinforcements are fixed with support plates that abut against the lower end surface of the partition 1, and a separator is sleeved on the pile foundation main reinforcement above the partition 1, the separator being used to separate the concrete from the pile foundation main reinforcement above the partition 1;

[0040] By setting the separator, after the poured concrete solidifies, there is no bonding between the pile foundation main reinforcement above the partition 1 and the concrete, and only the separator is bonded to the concrete. After the pile head is hoisted out, the concrete is separated from the pile foundation main reinforcement, and the head end of the pile foundation main reinforcement is exposed. Therefore, the steps of crushing concrete and stripping steel bars in the existing guidance steps can be omitted, and the step of cutting the pile head can be directly carried out, saving a lot of work hours.

[0041] An annular sleeve 12 is installed on the upper end surface of the partition 1 by bolts. A circle of mounting holes 121 is arranged in an circumferential array on the outer periphery of the annular sleeve 12. The mounting holes 121 correspond one-to-one to the main reinforcement of the pile foundation above the partition 1. A steel chisel is inserted into the mounting hole 121, and the steel chisel extends inward to the center axis of the adjacent partition 1; the pile head can be effectively cut off by striking the steel chisel.

[0042] The partition device includes a lock sleeve 2 and a nut 3. The lower end of the lock sleeve 2 is flush with the upper surface of the partition 1. The lower end of the lock sleeve 2 is divided into three equal parts by a partition opening 21. The three partition openings 21 divide the lower end of the lock sleeve 2 into three elastic sheets 22. The partition openings 21 are filled with a plastic elastic film 23. The inner wall of the lock sleeve 2 is provided with an anti-slip protrusion. The outer walls of the three elastic sheets 22 are all provided with an inwardly concave cutting opening 24; the inner wall of the nut 3 is provided with a fitting cutting opening. 24 of the protrusion; when the protrusion and the cutting edge 24 are misaligned, the elastic sheet 22 is used to clamp the main reinforcement of the pile foundation above the partition 1 through the protrusion of the nut 3; when the protrusion fits the cutting edge 24, a gap is left between the elastic sheet 22 and the main reinforcement of the pile foundation above the partition 1; the end of the steel drill is close to the nut 3, and the concrete above the partition 1 is separated from the concrete below by repeatedly hitting the steel drill, while the end of the steel drill hits the nut 3 so that the protrusion of the nut 3 fits the cutting edge 24;

[0043] Specifically, when the nut 3 is not installed on the elastic sheet 22, a gap is left between the locking sleeve 2 and the main reinforcement of the pile foundation passing through it, which can be inserted and removed freely; when the protrusion of the nut 3 is engaged with the cutting edge 24, the nut 3 just fits with the elastic sheet 22. When the nut 3 is turned, the protrusion on the inner wall of the nut 3 will rotate and then stagger the cutting edge 24 until it is squeezed to a position on the elastic sheet 22 that protrudes relative to the cutting edge 24. Then, the nut 3 and the elastic sheet 22 are not in a state of just fitting. Therefore, the elastic sheet 22 is subjected to the inward force of the nut 3, which causes the elastic sheet 22 to be squeezed inward and engage with the main reinforcement of the pile foundation. It is further explained that the force of the engagement between the elastic sheet 22 and the main reinforcement of the pile foundation is just enough to make it difficult for concrete to enter the interior, and at the same time, the force resistance received when the locking sleeve 2 is pulled out will not be too large. When pouring concrete, the nut 3 and the elastic sheet 22 are The position of the concrete remains fixed, that is, the elastic sheet 22 is squeezed inwardly and tightly engaged with the main reinforcement of the pile foundation, which can reduce the concrete from entering the locking sleeve 2, making it convenient to clean the concrete residue of the main reinforcement of the pile foundation later. At the same time, compared with the existing conventional separation of concrete and the main reinforcement of the pile foundation by means of plastic sleeves, etc., the present separation device cooperates with the locking sleeve 2 and the nut 3, and the inner wall of the annular sleeve 12 is fixedly connected to the drag rod 15, and the other end of the drag rod 15 is fixedly connected to the locking sleeve 2, and the drag rod 15 is vertically connected to the locking sleeve 2 to keep the locking sleeve 2 in a vertical upward state at all times; the steel bar can remain unchanged after being lifted off the pile head. The conventional separation of concrete and the main reinforcement of the pile foundation by means of plastic sleeves, etc. easily leads to the need for steel bar straightening when the steel bar is peeled off from the concrete, which is more laborious.

[0044] After the steel drill is inserted, its wedge-shaped tail end is inserted into the pile head. When the length of the steel drill inserted into the pile head is greater than half the radius, the pile head can be effectively cut off. Therefore, the length of the steel drill inserted into the annular sleeve 12 is less than the radius of the annular sleeve 12 but greater than half of the radius.

[0045] The pouring port 11 is located at the center of the partition 1. A circle of fastening components is arranged in an array on the outer periphery of the pouring port 11, which can further prevent the steel bars from being bent during the steel drill breaking concrete process. After the detached pile head is lifted out, each steel bar is straight and upward without deformation, thereby eliminating the step of straightening the steel bars. The fastening components include two threaded tubes 4 that are threadedly connected to the inner side of the partition 1. The ends of the threaded tubes 4 are rotatably connected to the connecting cylinders 41. The two connecting cylinders 41 are fixedly provided with arc plates 42 on the outer periphery of the pouring port 11 facing each other and located between the two threaded tubes 4. The two arc plates 42 are arranged facing each other, wherein, by rotating the threaded tubes 4, the threaded tubes 4 are The tube 4 is immersed in the inner side of the partition 1 and at the same time drives the arc plate 42 to fit tightly with the arc plate 42 on the outer periphery of the pouring port 11, and then the two arc plates 42 are tightly fitted to form a cylindrical structure. A clamping space is formed inside the two arc plates 42. The clamping space is circular, and the steel bars are inside the clamping space, which is used to stabilize and quickly position the main reinforcement of the pile foundation. After the pile head is lifted out, the partition 1 is pulled up and the fastening assembly is pulled upward synchronously. During the pulling process, the inner surfaces of the two arc plates 42 fit the outer surface of the steel bars and are lifted upward. During the lifting process, the concrete remaining on the outer surface of the steel bars can also be scraped off, further saving work time and improving efficiency.

[0046] The fastening components and the separation device cooperate with each other to ensure the straightening of the steel bars and the removal of residual concrete on the outer surface of the steel bars in two steps, which has a better effect;

[0047] An adjustment assembly is provided between the two opposing curved plates 42. The adjustment assembly includes a plurality of curved pieces 43 and a plurality of elastic silicone rubbers 44. The plurality of curved pieces 43 and the plurality of elastic silicone rubbers 44 are staggered and connected to form a curved surface 45. The outer curved surface of the curved surface 45 matches the inner curved surface of the curved plate 42. A plurality of springs 46 are fixedly connected between the curved surface 45 and the curved plate 42.

[0048] Specifically, when the steel bar is placed between the two curved plates 42, at this time, when the two facing curved plates 42 are in contact with each other, the curved surface 45 will be subjected to pressure toward the curved plate 42 and thus expand the internal capacity, and the elastic silicone 44 will be stretched and expanded under pressure, so that the curved surface 45 can maintain the original curvature and expand. Again, after the curved surface 45 expands, the spring 46 will act as an elastic force on the curved surface 45, which can clamp the steel bar clamped at the center of the two curved surfaces 45.

[0049] The steel chisel is tilted upward by 3° to 5°, and is inclined from bottom to top from the circumference of the bored pile to its center, with an angle range of 3° to 5° with the horizontal plane; this can avoid the bottom surface of the pile head protruding after removal, resulting in failure to meet design requirements.

[0050] A ring edge 13 is provided on the outer periphery of the partition 1 , and a hanging ring 14 is passed through the ring edge 13 .

[0051] The bored pile head construction method of this embodiment is constructed using the bored pile head construction device of any one of claims 1 to 8, and specifically comprises the following steps:

[0052] S1: Drilling and grouting pile construction, making and lowering the steel cage; according to the design requirements, determine the elevation, reasonably select a drilling rig to drill the bored pile, complete the pile excavation and hole cleaning, check the hole depth, hole position, hole diameter, inclination, etc. After the inspection is correct, support the partition 1 on the pile foundation main reinforcement of the pile foundation steel cage through the support plate, accurately determine the position where the pile head needs to be broken after the bored pile construction, ensure that the lower end surface of the partition 1 is at the same horizontal plane as the design elevation of the pile head, transport the pile foundation steel cage to the completed bored pile, and lower and preliminarily fix the pile foundation steel cage;

[0053] S2: Install the annular sleeve 12 and the steel chisel; fix the annular sleeve 12 to the top of the partition 1 by bolts, and insert the steel chisel into the mounting hole 121 of the annular sleeve 12;

[0054] S3: Install the locking sleeve 2; install the vertical locking sleeve 2 on the pile foundation main reinforcement, the lower end of the locking sleeve 2 abuts against the upper surface of the partition 1, and at the same time squeeze the elastic sheet 22 and adjust the position of the nut 3 located on the locking sleeve 2 so that the protrusion of the nut 3 is misaligned with the cutting edge 24. The elastic sheet 22 can clamp the pile foundation main reinforcement above the partition 1 through the protrusion of the nut 3;

[0055] S4: pouring concrete; the conduit required for the pile casting is lowered through the pouring port 11 of the partition 1, and the pile concrete is poured according to the construction plan, the height of the poured concrete is between the upper end of the partition 1 and the upper end of the locking sleeve 2;

[0056] S5: Separate the pile part to be broken; after the pile foundation concrete is initially set, the soil around the pile foundation can be excavated, and then the steel drill is repeatedly struck to make the steel drill immersed in the concrete. The length of the steel drill penetrating into the concrete is greater than half the radius of the annular sleeve 12. The upward squeezing force generated by the wedge-shaped tail of the steel drill is used to separate the pile head and the pile foundation;

[0057] S6: Move away from the separated pile head; after the pile head is separated from the pile foundation, separate the fixings related to the partition 1 and the support plate, loosen the partition 1 again, use a crane to hang the lifting ring 14, and lift out the broken pile head.

[0058] Wherein, in step S1:

[0059] When the partition 1 is placed on the support plate, the main reinforcement of the pile foundation steel cage passes through the clamping space formed inside the two arc-shaped plates 42. At the same time, the rotating threaded tube 4 drives the two arc-shaped plates 42 to fit tightly, thereby clamping the main reinforcement of the pile foundation firmly and keeping it vertical.

[0060] As a preferred option, Figure 6 、 Figure 7 As shown, the steel drill of this solution is specially designed, specifically including a top seat 51 and a drill body 52, wherein the drill body 52 includes an upper drill body 521 and a lower drill body 522, wherein the lower drill body 522 is a solid structure, similar to a conventional steel drill; while the upper drill body 521 is an internal hollow structure, and the upper drill body 521 and the top seat 51 are connected by a micro-seismic structure; the pressure of the strike is transmitted by striking the top seat 51, and under the pressure brought by the strike and the action of the micro-seismic structure, the entire steel drill will continue to vibrate slightly during the hammering process, thereby accelerating the speed of driving into the ground;

[0061] Specifically, the micro-seismic structure includes telescopic rods 61, one end of the telescopic rods 61 is fixedly connected to the bottom of the hollow area inside the upper drill body 521, and the other end is fixedly connected to the bottom of the top seat 51; and a spring 62 can be provided on the outside or inside of the telescopic rod 61, one end of the spring 62 is fixedly connected to the bottom of the hollow area inside the upper drill body 521, and the other end is fixedly connected to the bottom of the top seat 51, for achieving a reset effect; the bottom of the top seat 51 is provided with a hinged seat and a driving rod 63 is hinged to the hinged seat, and the other end of the driving rod 63 is movably inserted into the upper Inside the drill body 521; the upper drill body 521 is internally connected to a driving pulley 64, which is connected to a driven pulley 66 through a belt 65. Specifically, the driving pulley 64 and the driven pulley 66 are pulleys adapted to the belt 65; the other end of the driving rod 63 is connected to the end of the driving pulley 64 after passing through the interior of the upper drill body 521; further, the driven pulley 66 is coaxially fixedly connected to a cam 68 through a rotating shaft 67, and the rotation of the driven pulley 66 drives the cam 68 to continuously abut against the bottom of the hollow area inside the upper drill body 521;

[0062] When the top seat 51 is struck by the hammer, the pressure of the striking causes the top seat 51 to be squeezed toward the upper drill body 521. At this time, one end of the driving rod 63 is hinged to the active pulley 64, and the other end is hinged to the hinge seat. Therefore, the driving rod 63 will drive the active pulley 64 to rotate. At the same time, the belt 65 rotates to drive the driven pulley 66 and the cam 68 at the bottom to rotate. The cam 68 is now in contact with the bottom of the hollow area inside the upper drill body 521, which will drive the upper drill body 521 to move away from the top seat 51. Under the pressure brought by the striking and the action of the cam 68, the entire steel drill will continue to vibrate slightly during the process of being hammered into the ground, thereby accelerating the speed of driving into the ground.

[0063] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention's description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A bored pile head construction device, characterized by: The utility model comprises a partition (1), wherein the lower end surface of the partition (1) is in the same horizontal plane as the design elevation of the pile head; a pouring port (11) is provided in the middle of the partition (1), the upper part of the pile foundation steel cage passes through the pouring port (11), a plurality of pile foundation main reinforcements are fixed with support plates abutting against the lower end surface of the partition (1), and the pile foundation main reinforcements above the partition (1) are sleeved with a separation device, and the separation device is used to separate the concrete and the pile foundation main reinforcements above the partition (1); an annular sleeve (12) is installed on the upper end surface of the partition (1) by bolts, and a circle of mounting holes (121) are arranged in an annular array on the outer periphery of the annular sleeve (12), and the mounting holes (121) correspond to the pile foundation main reinforcements above the partition (1) one by one, and a steel drill is inserted into the mounting hole (121), and the steel drill extends inward to the center axis of the adjacent partition (1).

2. A bored pile head construction device according to claim 1, characterized in that: The partition device comprises a lock sleeve (2) and a nut (3). The lower end of the lock sleeve (2) is flush with the upper surface of the partition (1). The lower end of the lock sleeve (2) is divided into three equal parts by partition openings (21). The three partition openings (21) divide the lower end of the lock sleeve (2) into three elastic sheets (22). The interior of the partition openings (21) is filled with a plastic elastic film (23). The inner wall of the lock sleeve (2) is provided with anti-slip protrusions. The three elastic sheets (22) are provided with anti-slip protrusions. The outer wall of the elastic sheet (22) is provided with an inwardly recessed cutting edge (24); the inner wall of the nut (3) is provided with a protrusion that fits the cutting edge (24); when the protrusion and the cutting edge (24) are misaligned, the elastic sheet (22) is used to clamp the main reinforcement of the pile foundation above the partition (1) through the protrusion of the nut (3); when the protrusion fits the cutting edge (24), a gap is left between the elastic sheet (22) and the main reinforcement of the pile foundation above the partition (1).

3. A bored pile head construction device according to claim 2, characterized in that: The pouring port (11) is located at the center of the partition (1). A circle of fastening components is arranged in an array on the outer periphery of the pouring port (11). The fastening components include two threaded tubes (4) threadedly connected to the inner side of the partition (1). The ends of the threaded tubes (4) are rotatably connected to the connecting tubes (41). Arc plates (42) are fixedly arranged on the outer periphery of the pouring port (11) on the opposite side of the two connecting tubes (41) and between the two threaded tubes (4). The two arc plates (42) are arranged facing each other, and a clamping space is formed inside the two arc plates (42) for stabilizing and quickly positioning the main reinforcement of the pile foundation.

4. A bored pile head construction device according to claim 3, characterized in that: An adjustment component is provided between the two arc-shaped plates (42) arranged opposite to each other, and the adjustment component includes a plurality of arc-shaped pieces (43) and a plurality of elastic silica gels (44). The plurality of arc-shaped pieces (43) and the plurality of elastic silica gels (44) are staggered and connected to form an arc-shaped surface (45). The outer arc surface of the arc-shaped surface (45) matches the inner arc surface of the arc-shaped plate (42). A plurality of springs (46) are fixedly connected between the arc-shaped surface (45) and the arc-shaped plate (42).

5. The bored pile head construction device according to claim 2, characterized in that: The steel chisel is arranged to be tilted upwards by 3° to 5°.

6. A bored pile head construction device according to claim 2, characterized in that: A drag rod (15) is fixedly connected to the inner wall of the annular sleeve (12), and the other end of the drag rod (15) is fixedly connected to the locking sleeve (2).

7. A bored pile head construction device according to claim 2, characterized in that: The length of the steel drill inserted into the annular sleeve (12) is less than the radius of the annular sleeve (12) but greater than half of the radius.

8. The bored pile head construction device according to claim 1, characterized in that: A ring edge (13) is provided on the outer periphery of the partition (1), and a hanging ring (14) is passed through the ring edge (13).

9. A bored pile head construction method, characterized in that: The construction is carried out using the bored pile head construction device according to any one of claims 1 to 8, which specifically includes the following steps: S1: bored pile construction, making and lowering the steel cage; according to the design requirements, determine the elevation, reasonably select a drilling rig to drill the bored pile, complete the pile excavation and hole cleaning, check the hole depth, hole position, hole diameter, inclination, etc., after the inspection is correct, support the partition (1) on the pile foundation main reinforcement of the pile foundation steel cage through the support plate, accurately determine the position where the pile head needs to be broken after the bored pile construction, ensure that the lower end surface of the partition (1) is at the same horizontal plane as the design elevation of the pile head, transport the pile foundation steel cage to the completed bored pile, and lower and preliminarily fix the pile foundation steel cage; S2: Install the annular sleeve (12) and the steel chisel; fix the annular sleeve (12) to the top of the partition (1) by means of bolts, and insert the steel chisel into the mounting hole (121) of the annular sleeve (12); S3: Installing the locking sleeve (2); installing the vertical locking sleeve (2) on the pile foundation main reinforcement, with the lower end of the locking sleeve (2) abutting against the upper surface of the partition (1), and at the same time squeezing the elastic sheet (22) and adjusting the position of the nut (3) on the locking sleeve (2) so that the protrusion of the nut (3) and the cutting edge (24) are misaligned, so that the elastic sheet (22) can clamp the pile foundation main reinforcement above the partition (1) through the protrusion of the nut (3); S4: pouring concrete; lowering the conduit required for the pile casting through the pouring port (11) of the partition (1), and pouring the pile concrete according to the construction plan, with the height of the poured concrete being between the upper end of the partition (1) and the upper end of the locking sleeve (2); S5: Separate the part of the pile to be broken; after the pile foundation concrete is initially solidified, the soil around the pile foundation can be excavated, and then the steel drill is repeatedly struck to make the steel drill sink into the concrete. The length of the steel drill penetrating into the concrete is greater than half the radius of the annular sleeve (12), and the upward squeezing force generated by the wedge-shaped tail of the steel drill is used to separate the pile head and the pile foundation; S6: Remove the separated pile head; after the pile head is separated from the pile foundation, separate the fixing parts of the partition (1) and the support plate, loosen the partition (1) again, and use a crane to hang the lifting ring (14) to lift out the broken pile head.

10. A bored pile head construction method according to claim 9, characterized in that: In the step S1: When the partition (1) is placed on the support plate, the main reinforcement of the pile foundation steel cage passes through the clamping space formed inside the two arc-shaped plates (42). At the same time, the rotating threaded tube (4) drives the two arc-shaped plates (42) to fit tightly together, further clamping the main reinforcement of the pile foundation and keeping it vertical.

Images