A petal-shaped opening and closing drilling rig and a synchronous construction method for drilling and sinking piles

Abstract

The present invention is a petal-shaped opening and closing drilling machine and a synchronous construction method for drilling and sinking piles. The petal-shaped opening and closing drilling machine comprises a petal-shaped foldable drill bit, a petal-shaped foldable cap, a telescopic device, an opening and closing support structure, a buffer device and a drill rod; the petal-shaped foldable drill bit is fixedly connected to the end of the drill rod, the petal-shaped foldable cap is fixedly installed on the rod portion of the drill rod, the middle of the telescopic device is fixedly installed on the rod portion of the drill rod, the two ends of the telescopic device are telescopically and slidably installed on the rod portion of the drill rod, the lower end of the telescopic device is connected to the petal-shaped foldable drill bit through an opening and closing support structure, and the upper end is connected to the petal-shaped foldable cap through another opening and closing support structure, and the upper and lower ends of the telescopic device are both provided with buffer devices. The present invention adopts a construction method for synchronously drilling and sinking piles, which has high safety, good pile forming effect, low noise, wide applicability to various soil layers, short construction period, high efficiency, and high promotion effect.

Description

Technical Field

[0001] The invention relates to the technical field of prefabricated reinforced concrete pipe pile construction, and in particular to a petal-shaped openable and closable drilling rig and a synchronous construction method for drilling and sinking piles. Background Art

[0002] Prefabricated reinforced concrete pipe piles have the characteristics of fast construction speed and high pile efficiency. They are a common pile type in pile foundation construction, especially suitable for super high-rise buildings. However, their pile sinking construction is affected by traditional pile sinking methods, which limits their use scenarios and work content. Traditional pile sinking methods include hammer pile sinking, vibration pile sinking, static pile pressure and bored pile sinking. Hammering and vibration will produce huge noise, greatly disturb the surrounding soil, and there is soil squeezing. They are often prohibited in urban construction, which has a huge impact on the pile sinking operations of prefabricated reinforced concrete pipe piles, which are often located in urban super high-rise structures. In addition, static pile pressure is not suitable for construction in rocky soil layers, which limits its scope of operation. Bored pile sinking requires drilling before sinking the pipe. The construction period is long, the waiting period for pile sinking is long, and there is a risk of hole collapse. This method is not often used in prefabricated reinforced concrete pipe piles. Summary of the invention

[0003] The present invention aims to solve the deficiencies of the prior art and provides a petal-shaped openable and closable drilling rig and a synchronous construction method for drilling and pile sinking.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A petal-shaped openable and closable drilling rig comprises a petal-shaped foldable drill bit, a petal-shaped foldable platform, a telescopic device, an opening and closing support structure, a buffer device and a drill rod, wherein the petal-shaped foldable drill bit is fixedly connected to the end of the drill rod, the petal-shaped foldable platform is fixedly installed on the rod portion of the drill rod, the middle of the telescopic device is fixedly installed on the rod portion of the drill rod, the two ends of the telescopic device are telescopically and slidably installed on the rod portion of the drill rod, the lower end of the telescopic device is connected to the petal-shaped foldable drill bit through an opening and closing support structure, and the upper end is connected to the petal-shaped foldable platform through another opening and closing support structure, the upper and lower ends of the telescopic device are provided with buffer devices, and the drill rod is a hollow structure inside.

[0006] The petal-shaped foldable drill bit comprises a drill bit fastening ring, a drill bit fastening ear plate, a drill tip, a drill bit rotating connecting steel plate, a drill bit cutter head, a roller cutter and a drill bit supporting connecting steel plate;

[0007] The inner side wall of the drill bit fastening ring is welded to the outer wall of the drill rod end;

[0008] There are four sets of drill bit fastening ear plates, and the four sets are evenly welded on the outer side wall of the drill bit fastening ring;

[0009] The drill tip is welded to the lower end of the drill rod. The drill tip is an inverted cone structure with a hollow interior, and a hole is opened at the cone top corner of the drill tip.

[0010] The drill bit rotation connection steel plates include four and are respectively hinged to the corresponding drill bit fastening ear plates through pin shafts;

[0011] The drill cutter head is welded to the bottom of the drill rotating connecting steel plate, and the drill cutter head is a fan-shaped structure;

[0012] The roller cutters are installed at the bottom of the drill cutter head, and seven roller cutters are installed at the bottom of each drill cutter head;

[0013] The drill bit support connecting steel plate is wedge-shaped, one side of the vertical edge of the drill bit support connecting steel plate is welded to the middle of the drill bit rotation connecting steel plate, and the middle of one side of the bevel edge of the drill bit support connecting steel plate is hinged to the opening and closing support structure.

[0014] The maximum vertical upward opening and closing angle of the drill bit rotating connection steel plate, the drill bit cutter head, and the drill bit support connection steel plate of the petal-shaped foldable drill bit is 70 degrees.

[0015] The petal-shaped foldable cap includes a cap fastening ring, a cap fastening ear plate, a cap rotating connecting steel plate, a cap platform, a roller, and a cap supporting connecting steel plate;

[0016] The inner side wall of the cap fastening ring is welded to the outer wall of the drill rod;

[0017] There are four groups of cap fastening ear plates, and the four groups are evenly welded on the outer side wall of the cap fastening ring.

[0018] The pedestal rotating connection steel plates include four plates which are respectively hinged to the corresponding pedestal fastening ear plates through pins;

[0019] The cap platform is welded on the top of the cap rotating connecting steel plate, and the cap platform is a fan-shaped structure;

[0020] The roller is installed in a rolling manner in the middle of the top of the bearing platform;

[0021] The cap support connecting steel plate is wedge-shaped, one side of the vertical edge of the cap support connecting steel plate is welded to the middle of the cap rotation connecting steel plate, and the middle of one side of the bevel edge of the cap support connecting steel plate is hinged to the opening and closing support structure.

[0022] The maximum vertical downward opening and closing angle of the pedestal rotating connection steel plate, pedestal platform and pedestal support connection steel plate of the petal-shaped foldable pedestal is 70°.

[0023] The drill bit rotating connecting steel plate and the base rotating connecting steel plate are arranged at a staggered angle of 45 degrees.

[0024] The telescopic device includes a middle fastening device, a jacking device, a cap end assembly and a drill end assembly;

[0025] The interior of the middle fastening device is a hollow control chamber, the drill rod passes through the interior of the middle fastening device, and the middle fastening device is welded to the drill rod;

[0026] The jacking device includes four sets of cap jacks fixed on the top of the middle fastening device and four sets of drill jacks fixed on the bottom of the middle fastening device. The cap jacks are connected to the cap jack controllers, and the drill jacks are connected to the drill jack controllers. The cap jack controllers and the drill jack controllers are both installed in the control chamber of the middle fastening device.

[0027] The cap end assembly includes a cap end disc fixed on the top of four sets of cap jacks, a cap end column is welded on the top of the cap end disc, the cap end disc and the cap end column are slidably sleeved outside the drill pipe, the top of the cap end column is welded to the buffer device, and the side wall of the cap end column is hinged to the opening and closing support structure;

[0028] The drill end assembly includes a drill end disc fixed at the bottom of four sets of drill jacks, a drill end column is welded to the bottom of the drill end disc, the drill end disc and the drill end column are slidably mounted outside the drill rod, the bottom of the drill end column is welded to the buffer device, and the side wall of the drill end column is hinged to the opening and closing support structure.

[0029] The opening and closing support structure includes a cap support assembly and a drill bit support assembly;

[0030] The cap support assembly includes four cap support rods, one end of which is hinged to the side wall of the cap end column and the other end is hinged to the middle part of one side of the bevel edge of the cap support connecting steel plate;

[0031] The drill bit support assembly comprises four drill bit support rods, one end of the drill bit support rod is hinged to the side wall of the drill bit end column and the other end is hinged to the middle part of one side of the bevel edge of the drill bit support connecting steel plate.

[0032] The buffer device includes a buffer end spring of the platform and a buffer end spring of the drill bit;

[0033] The spring at the buffer end of the cap is welded to the end of the cap end column and the other end is freely in contact with or separated from the cap fastening ring;

[0034] The drill bit buffer end spring is welded to the end of the drill bit end column and the other end is freely in contact with or separated from the drill bit fastening ring.

[0035] A method for synchronous construction of drilling and pile sinking, using the petal-shaped openable and closable drilling rig, wherein drilling and pile sinking are carried out synchronously, and the piles are sunk as the drilling is done. After the pile sinking operation is completed, the petal-shaped openable and closable drilling rig is recovered and recycled.

[0036] The specific steps are:

[0037] S1, the petal-shaped openable and closable drilling rig is in place and firmly connected to the external rotating drilling rig;

[0038] S2. Four sets of drill jacks are lifted, and the petal-shaped foldable drill bits are unfolded. The external rotary drill drives the petal-shaped openable and closable drill to rotate and cut the soil to drill holes. At the same time, bentonite mortar is injected into the hole through the drill rod and drill tip;

[0039] S3. Drill to the depth of the middle fastening device, stop drilling, check the position, vertical deviation and stability of the petal-shaped opening and closing drilling rig and the hole body, and at the same time, unfold the petal-shaped foldable platform and check the rolling condition of the roller. After the inspection is qualified, the petal-shaped opening and closing drilling rig continues to drill and sink;

[0040] S4, the petal-shaped retractable drilling rig drills to a position 2m away from the hole of the petal-shaped foldable cap, stops drilling, checks the petal-shaped retractable drilling rig and the borehole, and simultaneously lowers the prefabricated reinforced concrete pipe piles to the petal-shaped foldable cap. After checking the stability of the petal-shaped foldable cap, the prefabricated reinforced concrete pipe piles are synchronously sunk as the petal-shaped retractable drilling rig drills;

[0041] S5. After drilling to the designed elevation, stop drilling, retract the four sets of drill jacks, close the petal-shaped foldable drill bit, and clean the bottom of the hole;

[0042] S6. After the petal-shaped foldable drill bit is closed, the four sets of jacks of the cap are retracted, and the petal-shaped foldable cap is closed, driving the precast reinforced concrete pipe pile to slowly sink to the designed elevation;

[0043] S7, petal-shaped opening and closing drilling rig can be lifted and recovered;

[0044] S8, replacing bentonite mortar in the voids of the pile holes with cement mortar, and replacing or draining the bentonite mortar in the prefabricated reinforced concrete pipe piles;

[0045] S9. Check the integrity of the recovered petal-shaped retractable drilling rig and prepare for the construction of the next prefabricated reinforced concrete pipe pile until the construction is completed.

[0046] The beneficial effects of the present invention are as follows: the present invention adopts a construction method in which drilling and pile sinking are carried out simultaneously, which has the advantages of high safety, good pile-forming effect, low noise, wide applicability to various soil layers, short construction period, high efficiency, and is particularly suitable for use in the construction of prefabricated reinforced concrete pipe piles for urban super-high-rise structures, and has a high promotion effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a structural schematic diagram of a petal-shaped openable and closable drilling rig in the present invention;

[0048] Figure 2 It is a structural schematic diagram of the petal-shaped foldable drill bit of the present invention;

[0049] Figure 3 It is a structural schematic diagram of the petal-shaped foldable support platform in the present invention;

[0050] Figure 4 It is a schematic diagram of the structure of the telescopic device and the buffer device in the present invention;

[0051] Figure 5 It is a structural schematic diagram of the opening and closing support structure in the present invention;

[0052] Figure 6 Schematic diagram of step S1 of the synchronous construction method of drilling and pile driving in the present invention;

[0053] Figure 7 A schematic diagram of step S2 of the synchronous construction method of drilling and pile sinking in the present invention;

[0054] Figure 8 A schematic diagram of step S3 of the synchronous construction method of bored pile driving in the present invention;

[0055] Fig. 9 Schematic diagram of step S4 of the synchronous construction method of bored pile driving in the present invention;

[0056] Fig.10 Schematic diagram of step S5 of the synchronous construction method of drilling and pile sinking in the present invention;

[0057] Fig.11 Schematic diagram of step S6 of the synchronous construction method of bored pile driving in the present invention;

[0058] Fig.12 Schematic diagram of step S7 of the synchronous construction method of bored pile driving in the present invention;

[0059] Fig.13 A schematic diagram of step S8 of the synchronous construction method of bored pile driving in the present invention;

[0060] In the figure: 1- petal-shaped foldable drill bit; 2- petal-shaped foldable cap; 3- telescopic device; 4- opening and closing support structure; 5- buffer device; 6- drill rod; 7- prefabricated reinforced concrete pipe pile;

[0061] 11-drill bit fastening ring; 12-drill bit fastening ear plate; 13-drill tip; 14-drill bit rotation connecting steel plate; 15-drill bit cutter head; 16-roller; 17-drill bit support connecting steel plate;

[0062] 21-cap fastening ring; 22-cap fastening ear plate; 23-cap rotation connecting steel plate; 24-cap platform; 25-roller; 26-cap support connecting steel plate;

[0063] 31-middle fastening device; 32-lifting device; 33-cap end assembly; 34-drill end assembly;

[0064] 41-cap support assembly; 42-drill support assembly;

[0065] 51-cap buffer end spring; 52-drill buffer end spring;

[0066] 311-middle fastening device column; 312-middle fastening device cap ring; 313-middle fastening device drill ring; 314-middle fastening device sealing plate;

[0067] 321-cap jack; 322-drill jack;

[0068] 331-cap end disc; 332-cap end column;

[0069] 341-drill end disc; 342-drill end column;

[0070] The following is a detailed description of the embodiments of the present invention with reference to the accompanying drawings. DETAILED DESCRIPTION

[0071] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The embodiments are only used to explain the present invention and are not used to limit the scope of the present invention. The present invention is described in more detail by way of example with reference to the accompanying drawings in the following paragraphs. The advantages and features of the present invention will become clearer according to the following description. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, and are only used to facilitate and clearly assist in explaining the purpose of the embodiments of the present invention.

[0072] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0073] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0074] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0075] The present invention has developed a petal-shaped openable and closable drilling rig and a synchronous construction method for drilling and pile driving, which can sink piles as drilling proceeds and is suitable for a variety of different geological soil layers such as clay, silt, sand, gravel, crushed stone, pebble soil, strongly weathered rock, moderately weathered rock and slightly weathered rock.

[0076] A petal-shaped drill rig that can be opened and closed, such as Figure 1 As shown, it includes: a petal-shaped foldable drill bit 1, a petal-shaped foldable support platform 2, a telescopic device 3, an opening and closing support structure 4, a buffer device 5 and a drill rod 6.

[0077] The petal-shaped foldable drill bit 1 and the petal-shaped foldable support 2 are staggered by 45° along the central axis of the drill rod 6 and are symmetrical relative to the center of the opening and closing support structure 4.

[0078] The staggered arrangement angle between the petal-shaped foldable drill bit 1 and the petal-shaped foldable support 2 can be adjusted according to the site conditions and process requirements.

[0079] Furthermore, Figure 2 As shown, the petal-shaped foldable drill bit 1 has a maximum vertical opening and closing angle of 70°, which can be opened for drilling and closed for recovery; it includes: a drill bit fastening ring 11, a drill bit fastening ear plate 12, a drill tip 13, a drill bit rotating connecting steel plate 14, a drill bit cutter disc 15, a roller cutter 16 and a drill bit supporting connecting steel plate 17.

[0080] The vertical upward opening and closing angle of the petal-shaped foldable drill bit 1 can be adjusted according to the on-site conditions and process requirements, and only the size of the drill bit support connection steel plate 17 needs to be adjusted.

[0081] The drill tip 13 is located at the top of the drill rod 6, is in an inverted cone shape, has a hollow structure, is welded to the top of the drill rod 6, and has a hole at the conical vertex. High-pressure water or wall-protecting mud can be sprayed from the drill tip 13 through the drill rod 6 to the surrounding soil.

[0082] The drill bit fastening ring 11 is located at the rear end of the drill tip 13 , and is welded to the drill rod 6 on the inner side and to the drill bit fastening ear plate 12 on the outer side.

[0083] The drill bit fastening ear plate 12 comprises four identical steel plate groups which are arranged at equal intervals around the circumference of the drill bit fastening ring 11 .

[0084] The drill cutter head 15 includes four identical sector-shaped steel plates, which are hinged to the roller cutter 16 to provide a stable supporting surface for the roller cutter 16 .

[0085] The roller cutter 16 is hinged with the fan-shaped steel plate of the drill cutter head 15 and can work together to cut the soil layer as the drill cutter head 15 rotates.

[0086] The drill bit rotation connecting steel plate 14 is welded to the drill bit cutter head 15 to improve the rigidity of the drill bit cutter head 15 , and is welded to the drill bit supporting connecting steel plate 17 , and the short end is hinged to the drill bit fastening ear plate 12 .

[0087] The drill bit support connecting steel plate 17 is wedge-shaped, one side of the vertical side is welded to the drill bit rotation connecting steel plate 14, and the middle part of one side of the bevel side is hinged to the opening and closing support structure 4.

[0088] Furthermore, Figure 3 As shown, the petal-shaped foldable pedestal 2 has a maximum opening and closing angle of 70° vertically downward, which can be opened for drilling and closed for recovery; it includes: a pedestal fastening ring 21, a pedestal fastening ear plate 22, a pedestal rotating connecting steel plate 23, a pedestal platform 24, a roller 25, and a pedestal supporting connecting steel plate 26.

[0089] The vertical downward opening and closing angle of the petal-shaped foldable foundation 2 can be adjusted according to the site conditions and process requirements, and only the size of the foundation support connecting steel plate 26 needs to be adjusted.

[0090] The inner side of the cap fastening ring 21 is welded to the drill rod 6 , and the outer side is welded to the cap fastening ear plate 22 .

[0091] The cap fastening lugs 22 include four identical steel plate groups which are arranged at equal intervals around the circumference of the cap fastening ring 21 .

[0092] The support platform 24 includes four identical sector-shaped steel plates, which are hinged to the roller 25 to provide a stable rolling surface for the roller 25 .

[0093] The roller 25 is cylindrical and hinged with the fan-shaped steel plate of the pedestal platform 24. It can rotate along the center line of the cylinder and roll freely with the rotation of the pedestal platform 24. The top of the roller 25 is in contact with the precast hollow concrete pile 7 or the precast hollow concrete structure. When the pedestal platform 24 rotates with the drill rod 6, the free rolling action of the roller 25 prevents the rotation of the precast hollow concrete pile 7 or the precast hollow concrete structure, and the roller 25 is relatively stationary in the plane annular direction relative to the drill hole.

[0094] The pedestal rotatable connecting steel plate 23 is welded to the pedestal platform 24 to improve the rigidity of the pedestal platform 24, and is welded to the pedestal supporting connecting steel plate 26, and the short end is hinged to the pedestal fastening ear plate 22.

[0095] The cap support connecting steel plate 26 is wedge-shaped, one side of the vertical side is welded to the cap rotation connecting steel plate 23, and the middle part of one side of the bevel side is hinged to the opening and closing supporting structure 4.

[0096] Furthermore, Figure 4As shown, the telescopic device 3 can be telescoped up and down along the drill rod 6, and is hinged with the opening and closing support structure 4 to control the opening and closing angles of the petal-shaped foldable drill bit 1 and the petal-shaped foldable base 2; it includes: a middle fastening device 31, a lifting device 32, a base end assembly 33 and a drill bit end assembly 34.

[0097] The middle fastening device 31 is welded to the drill rod 6 to provide a fixed platform for the jacking device 32, and at the same time, provides a control space for the jacking device 32, including: a middle fastening device base ring 312, a middle fastening device drill ring 313, a middle fastening device column 311 and a middle fastening device sealing plate 314, forming a closed shell structure.

[0098] The middle fastening device cap ring 312 is welded to the drill rod 6 to provide a fixed platform for the jacking device 32.

[0099] The drill bit ring 313 of the middle fastening device is welded to the drill rod 6 to provide a fixed platform for the jacking device 32.

[0100] The middle fastening device column 311 is located between the middle fastening device base ring 312 and the middle fastening device drill bit ring 313, and its two ends are respectively firmly welded to the middle fastening device base ring 312 and the middle fastening device drill bit ring 313.

[0101] The middle fastening device sealing plate 314 is welded to the middle of the middle fastening device base ring 312 and the middle of the middle fastening device drill bit ring 313, and together with the middle fastening device base ring 312, the middle fastening device drill bit ring 313 and the middle fastening device column 311, forms a closed space fixed on the drill rod 6.

[0102] The jacking device 32 includes a cap jack assembly, a drill jack assembly and a jack control assembly.

[0103] The cap jack assembly includes four sets of cap jacks 321, and both ends of the cap jacks 321 are welded to the cap ring 312 of the middle fastening device and the cap end assembly 33 respectively.

[0104] The drill jack assembly includes four sets of drill jacks 322, and both ends of the drill jacks 322 are respectively welded to the middle fastening device drill ring 313 and the drill end assembly 34.

[0105] The support base end assembly 33 includes a support base end disc 331 and a support base end column 332 .

[0106] The cap end disc 331 can move up and down along the length direction of the drill rod 6 and is welded with the cap jack 321 and the cap end column 332.

[0107] The pedestal end column 332 has one end welded to the pedestal end disc 331 and the other end welded to the buffer device 5 . The side wall of the pedestal end column 332 is hingedly connected to the opening and closing support structure 4 .

[0108] The drill head assembly 34 includes a drill head disc 341 and a drill head column 342 .

[0109] The drill end disc 341 can move up and down along the length direction of the drill rod 6 and is welded with the drill jack 322 and the drill end column 342.

[0110] One end of the drill end column 342 is welded to the drill end disc 341 , and the other end is welded to the buffer device 5 . The side wall of the drill end column 342 is hingedly connected to the opening and closing support structure 4 .

[0111] The jack control assembly includes a cap jack controller and a drill jack controller. The cap jack controller is located in the space of the middle fastening device 31 and adjusts the extension and retraction of the cap jack 321. The drill jack controller is located in the space of the middle fastening device 31 and adjusts the extension and retraction of the drill jack 322.

[0112] Furthermore, Figure 5 As shown, the opening and closing support structure 4 includes a base support assembly 41 and a drill bit support assembly 42.

[0113] The cap support assembly 41 includes four steel pipe columns or steel columns, both ends of which are hingedly connected to the cap end column 332 and the cap support connecting steel plate 26 respectively.

[0114] The drill bit support assembly 42 includes four steel pipe columns or steel columns, both ends of which are hingedly connected to the drill bit end column 342 and the drill bit support connecting steel plate 17 respectively.

[0115] Furthermore, Figure 4 As shown, the buffer device 5 includes a buffer end spring 51 of the support platform and a buffer end spring 52 of the drill bit.

[0116] The cushioning end spring 51 of the platform has one end welded to the platform end column 332 and moves up and down with the platform end column 332, and the other end can freely contact or disengage with the platform fastening ring 21.

[0117] The drill bit buffer end spring 52 has one end welded to the drill bit end column 342 and moves up and down with the drill bit end column 342, and the other end can freely contact or disengage with the drill bit fastening ring 11.

[0118] Furthermore, the drill rod 6 has a circular cross-section, and grouting or high-pressure water can be injected into the hollow structure space. One end is welded to the drill tip 13, and the other end can be extended as drilling proceeds. The last section of the drill rod 6 is connected to the rotary drilling rig and rotates under the rotation of the rotary drilling rig, thereby driving the petal-shaped foldable drill bit 1 to perform rotary cutting drilling.

[0119] A method for synchronous construction of drilling and pile sinking, using the petal-shaped openable and closable drilling rig, wherein drilling and pile sinking are carried out synchronously, and the piles are sunk as the drilling is done. After the pile sinking operation is completed, the petal-shaped openable and closable drilling rig is recovered and recycled.

[0120] The specific steps are:

[0121] S1, such as Figure 6 As shown, the petal-shaped openable and closable drill is in place and firmly connected to the external rotating drill;

[0122] S2, such as Figure 7 As shown, four sets of drill jacks 322 are lifted, the petal-shaped foldable drill 1 is unfolded, and the external rotary drill drives the petal-shaped openable and closable drill to rotate and cut the soil to drill and sink. At the same time, bentonite mortar is grouted into the hole through the drill rod 6 and the drill tip 13;

[0123] S3, such as Figure 8 As shown, the hole is drilled to the depth position of the middle fastening device 31, and the drilling is stopped. The position, vertical deviation and stability of the petal-shaped opening and closing drilling rig and the hole body are checked. At the same time, the petal-shaped foldable platform 2 is unfolded and the rolling condition of the roller 25 is checked. After the inspection is qualified, the petal-shaped opening and closing drilling rig continues to drill and sink;

[0124] S4, such as Fig. 9 As shown, the petal-shaped retractable drilling rig drills to a position 2m away from the hole of the petal-shaped foldable cap 2, stops drilling, checks the petal-shaped retractable drilling rig and the drilled hole, and simultaneously lowers the prefabricated reinforced concrete pipe pile 7 to the petal-shaped foldable cap 2. After checking the stability of the petal-shaped foldable cap 2, the prefabricated reinforced concrete pipe pile 7 is synchronously sunk as the petal-shaped retractable drilling rig drills;

[0125] S5, such as Fig.10 As shown, after drilling to the designed elevation, drilling is stopped, the four sets of drill jacks 322 are retracted, the petal-shaped foldable drill bit 1 is closed, and the bottom sediment of the hole is cleaned;

[0126] S6, such as Fig.11 As shown, after the petal-shaped foldable drill bit 1 is closed, the four sets of pedestal jacks 321 are retracted, and the petal-shaped foldable pedestal 2 is closed, driving the prefabricated reinforced concrete pipe pile 7 to slowly sink to the designed elevation;

[0127] S7, such as Fig.12 As shown, the petal-shaped opening and closing drill can be lifted and recovered;

[0128] S8, such as Fig.13 As shown, the bentonite mortar in the gap of the pile hole is replaced by the cement mortar, and the bentonite mortar in the prefabricated reinforced concrete pipe pile 7 is replaced or drained;

[0129] S9, check the integrity of the recovered petal-shaped retractable drilling rig, and prepare for the construction of the next prefabricated reinforced concrete pipe pile 7 until the construction is completed.

[0130] The patent of the present invention discloses a petal-shaped openable and closable self-synchronous drilling pile driving rig and a construction method. Prefabricated reinforced concrete pipe piles 7 can be synchronously sunk as the drilling rig is drilled. The construction method of drilling and sinking piles simultaneously uses a rotating cutting soil body to drill and simultaneously support the prefabricated reinforced concrete pipe piles 7 to sink into place, which changes the traditional construction method of sinking the piles into place by applying vertical force to the prefabricated reinforced concrete pipe piles 7.

[0131] The present invention adopts a construction method in which drilling and pile sinking are carried out simultaneously. The disturbance to the soil body is small and noiseless during the construction process. The present invention is applicable to various geological soil layers such as clay, silt, sand, gravel, crushed stone, pebble, strong weathered rock, medium weathered rock and slightly weathered rock. Moreover, the prefabricated reinforced concrete pipe pile 7 can play a role in protecting the wall and avoid the occurrence of hole collapse. In addition, the mutual contact between the prefabricated reinforced concrete pipe pile 7 and the hole wall can have a certain righting effect on the drilling rig, reduce the vertical deviation of drilling and pile sinking, and ensure verticality.

[0132] The present invention adopts a method of sinking piles as drilling progresses, thereby avoiding the need to perform drilling and pile sinking in separate steps. Pile sinking does not require waiting for the completion of drilling, thus shortening the construction period.

[0133] Compared with traditional construction techniques and methods, this patent has the advantages of high safety, good pile-forming effect, low noise, wide applicability to various soil layers, short construction period and high efficiency. It is particularly suitable for use in the construction of prefabricated reinforced concrete pipe piles 7 in urban super-high-rise structures and has a high promotion effect.

[0134] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A petal-shaped openable and closable drilling rig, characterized in that: The invention comprises a petal-shaped foldable drill bit (1), a petal-shaped foldable support platform (2), a telescopic device (3), an opening and closing support structure (4), a buffer device (5) and a drill rod (6), wherein the petal-shaped foldable drill bit (1) is fixedly connected to the end of the drill rod (6), the petal-shaped foldable support platform (2) is fixedly mounted on the rod portion of the drill rod (6), the middle of the telescopic device (3) is fixedly mounted on the rod portion of the drill rod (6), the two ends of the telescopic device (3) are telescopically and slidably mounted on the rod portion of the drill rod (6), the lower end of the telescopic device (3) is connected to the petal-shaped foldable drill bit (1) via an opening and closing support structure (4), and the upper end is connected to the petal-shaped foldable support platform (2) via another opening and closing support structure (4), the upper end and the lower end of the telescopic device (3) are both provided with a buffer device (5), and the drill rod (6) is a hollow structure; The petal-shaped foldable drill bit (1) comprises a drill bit fastening ring (11), a drill bit fastening ear plate (12), a drill tip (13), a drill bit rotating connection steel plate (14), a drill bit cutter head (15), a roller cutter (16) and a drill bit supporting connection steel plate (17); the inner wall of the drill bit fastening ring (11) is welded to the outer wall of the end of a drill rod (6); there are four groups of drill bit fastening ear plates (12) and the four groups are evenly welded on the outer wall of the drill bit fastening ring (11); the drill tip (13) is welded to the lower end of the drill rod (6); the drill tip (13) is an inverted cone structure with a hollow interior, and a hole is opened at the cone top corner of the drill tip (13); the drill bit rotating connection steel plate (14) comprises four and is respectively connected to the corresponding drill bit fastening ear plates (12) through a pin shaft ) hinged; the drill cutter disc (15) is welded to the bottom of the drill rotating connecting steel plate (14), and the drill cutter disc (15) is a fan-shaped structure; the roller cutter (16) is rotatably installed at the bottom of the drill cutter disc (15), and seven roller cutters (16) are installed at the bottom of each drill cutter disc (15); the drill support connecting steel plate (17) is wedge-shaped, and one side of the vertical side of the drill support connecting steel plate (17) is welded to the middle of the drill rotating connecting steel plate (14), and the middle of one side of the bevel side of the drill support connecting steel plate (17) is hinged to the opening and closing support structure (4); the maximum vertical upward opening and closing angle of the drill rotating connecting steel plate (14), the drill cutter disc (15), and the drill support connecting steel plate (17) of the petal-shaped foldable drill bit (1) is 70°; The petal-shaped foldable cap (2) comprises a cap fastening ring (21), a cap fastening ear plate (22), a cap rotation connection steel plate (23), a cap platform (24), a roller (25), and a cap support connection steel plate (26); the inner wall of the cap fastening ring (21) is welded to the outer wall of the rod portion of the drill rod (6); there are four groups of cap fastening ear plates (22) and the four groups are evenly welded on the outer wall of the cap fastening ring (21); the cap rotation connection steel plate (23) comprises four and is respectively hinged to the corresponding cap fastening ear plates (22) through a pin shaft; the cap platform (24) is welded to the cap rotation connection steel plate (26). The top of the connecting steel plate (23) is a fan-shaped structure; the roller (25) is rollingly installed at the middle position of the top of the supporting platform (24); the supporting platform supporting connecting steel plate (26) is wedge-shaped, one side of the vertical side of the supporting platform supporting connecting steel plate (26) is welded to the middle of the supporting platform rotating connecting steel plate (23), and the middle part of one side of the oblique angle side of the supporting platform supporting connecting steel plate (26) is hinged to the opening and closing support structure (4); the maximum vertical downward opening and closing angle of the supporting platform rotating connecting steel plate (23), the supporting platform (24), and the supporting platform connecting steel plate (26) of the petal-shaped foldable supporting platform (2) is 70°.

2. A petal-shaped openable and closable drilling rig according to claim 1, characterized in that: The drill bit rotation connecting steel plate (14) and the bearing platform rotation connecting steel plate (23) are arranged in a staggered manner at 45 degrees.

3. A petal-shaped openable and closable drilling rig according to claim 2, characterized in that: The telescopic device (3) comprises a middle fastening device (31), a lifting device (32), a base end assembly (33) and a drill end assembly (34); The interior of the middle fastening device (31) is a hollow control chamber, the drill rod (6) passes through the interior of the middle fastening device (31), and the middle fastening device (31) and the drill rod (6) are welded together; The jacking device (32) comprises four sets of bearing platform jacks (321) fixed to the top of the middle fastening device (31), and four sets of drill bit jacks (322) fixed to the bottom of the middle fastening device (31). The bearing platform jacks (321) are connected to bearing platform jack controllers, and the drill bit jacks (322) are connected to drill bit jack controllers. The bearing platform jack controllers and the drill bit jack controllers are both installed in the control chamber of the middle fastening device (31). The cap end assembly (33) comprises a cap end disc (331) fixed on the top of four sets of cap jacks (321), a cap end column (332) is welded on the top of the cap end disc (331), the cap end disc (331) and the cap end column (332) are slidably mounted outside the drill rod (6), the top of the cap end column (332) is welded to the buffer device (5), and the side wall of the cap end column (332) is hinged to the opening and closing support structure (4); The drill end assembly (34) comprises a drill end disc (341) fixed to the bottom of four sets of drill jacks (322); a drill end column (342) is welded to the bottom of the drill end disc (341); the drill end disc (341) and the drill end column (342) are slidably mounted outside the drill rod (6); the bottom of the drill end column (342) is welded to the buffer device (5); and the side wall of the drill end column (342) is hinged to the opening and closing support structure (4).

4. The petal-shaped closable drilling rig according to claim 3, characterized in that: The opening and closing support structure (4) comprises a platform support assembly (41) and a drill bit support assembly (42); The cap support assembly (41) comprises four cap support rods, one end of the cap support rod is hinged to the side wall of the cap end column (332) and the other end is hinged to the middle part of one side of the bevel edge of the cap support connecting steel plate (26); The drill support assembly (42) comprises four drill support rods, one end of which is hinged to the side wall of the drill end column (342) and the other end of which is hinged to the middle of one side of the bevel edge of the drill support connecting steel plate (17).

5. The petal-shaped openable and closable drilling rig according to claim 4, characterized in that: The buffer device (5) comprises a cushion platform buffer end spring (51) and a drill bit buffer end spring (52); The cushioning end spring (51) of the platform is welded to the end of the platform head column (332) and the other end is freely in contact with or separated from the platform fastening ring (21); The drill bit buffer end spring (52) is welded to the end of the drill bit end column (342) and the other end is freely in contact with or separated from the drill bit fastening ring (11).

6. A method for synchronous construction of pile drilling, using a petal-shaped openable and closable drilling rig as claimed in claim 5, characterized in that: Drilling and pile sinking are carried out simultaneously. After the pile sinking operation is completed, the petal-shaped opening and closing drilling rig can be recovered and recycled. The specific steps are: S1, the petal-shaped openable and closable drilling rig is in place and firmly connected to the external rotating drilling rig; S2, four sets of drill jacks (322) are lifted, the petal-shaped foldable drill bit (1) is unfolded, and the external rotary drill drives the petal-shaped openable and closable drill to rotate and cut the soil to drill a hole, and at the same time, bentonite mortar is injected into the hole through the drill rod (6) and the drill tip (13); S3, drilling to the depth position of the middle fastening device (31), stopping drilling, checking the position, vertical deviation and stability of the petal-shaped opening and closing drilling rig and the hole body, and at the same time, unfolding the petal-shaped foldable support (2) and checking the rolling condition of the roller (25). After the inspection is qualified, the petal-shaped opening and closing drilling rig continues to drill and sink; S4, the petal-shaped foldable drilling rig drills to a position 2 m away from the hole of the petal-shaped foldable cap (2), stops drilling, checks the petal-shaped foldable drilling rig and the drilled hole, and simultaneously lowers the prefabricated reinforced concrete pipe pile (7) to the petal-shaped foldable cap (2). After checking the stability of the petal-shaped foldable cap (2), the prefabricated reinforced concrete pipe pile (7) is synchronously sunk as the petal-shaped foldable drilling rig drills; S5, after drilling to the designed elevation, the drilling is stopped, the four sets of drill jacks (322) are retracted, the petal-shaped foldable drill bit (1) is closed, and the bottom of the hole is cleaned; S6. After the petal-shaped foldable drill bit (1) is closed, the four sets of pedestal jacks (321) are retracted, and the petal-shaped foldable pedestal (2) is closed, driving the prefabricated reinforced concrete pipe pile (7) to slowly sink to the designed elevation; S7, petal-shaped opening and closing drilling rig can be lifted and recovered; S8, replacing the bentonite mortar in the voids of the pile hole with cement mortar, and replacing or draining the bentonite mortar in the prefabricated reinforced concrete pipe pile (7); S9, check the integrity of the recovered petal-shaped retractable drilling rig, and prepare for the construction of the next prefabricated reinforced concrete pipe pile (7) until the construction is completed.

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