Construction equipment, application and method of composite pile

Abstract

The invention discloses a construction device, application and method of a combined pile, solves the problem that in the prior art, the combined pile construction is complex, and has the beneficial effects that construction is convenient, the construction process is simplified, and the construction cost is reduced, according to the specific scheme, the construction device of the combined pile comprises a supporting base, and the supporting base is provided with a walking mechanism; the supporting base supports the fixing frame, the fixing frame supports the drilling machine, the drilling rod can ascend and descend relative to the fixing frame, the drilling machine is connected with the hollow drilling rod, the fixing frame further supports a pile hoisting mechanism, the pile hoisting mechanism can ascend and descend relative to the fixing frame, and the drilling rod is detachably arranged so that a prefabricated core pile can enter the lower drilling rod through the pile hoisting mechanism. An openable drill bit is arranged at the bottom of the lower drill rod, the openable drill bit is opened relative to the drill rod in the lifting process of the drill rod so that the prefabricated core pile can be implanted into the drill hole, and a grouting pipe is arranged on the side portion of the drill rod so as to inject grout or flow-state solidified soil.

Description

Technical Field

[0001] The invention relates to the field of foundation reinforcement and pile foundation construction machinery, and in particular to construction equipment, application and method of a combined pile. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Due to its own limitations, natural foundations often have problems such as insufficient bearing capacity and excessive settlement, making it difficult to meet construction needs. Therefore, it is usually necessary to improve these poor soils and transform them into composite foundations to better meet engineering requirements. Composite foundations can be divided into three types: bulk material piles, flexible piles and rigid pile composite foundations. The latter two are now common, but there are still the following shortcomings in actual use: flexible piles have less impact on the environment and less soil squeezing effect, but poor compressive strength, and are easily deformed by compression, and the load transfer depth is limited; rigid piles have strong compressive strength, but as friction piles, when the strength of the pile body is not fully utilized, the lower friction resistance of the surrounding soil layer has exceeded the allowable range for the support of the pile, the foundation has a large deformation and cannot bear the load normally, and the economic benefit is low. For this reason, there is a design of combined piles in the prior art, but when the combined piles are constructed, the outer cast-in-place piles are constructed first, and then the core piles are placed. Multiple construction equipment is required to achieve the smooth construction of the combined piles, and there are problems of low construction efficiency and high construction cost.

[0004] In addition, these piles require a large amount of cement during use, which not only increases construction costs but also violates the concept of sustainable development. Summary of the invention

[0005] In view of the deficiencies in the prior art, an object of the present invention is to provide a construction device for a composite pile, which can realize the smooth construction of the composite pile.

[0006] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0007] The present invention also provides a construction device for a combined pile, including a supporting base, the supporting base is provided with a walking mechanism, the supporting base supports a fixed frame, the fixed frame supports a drilling rig, the drill rod can be raised and lowered relative to the fixed frame, the drilling rig is connected to the hollow drill rod, the fixed frame also supports a pile lifting mechanism, the pile lifting mechanism can be raised and lowered relative to the fixed frame, the drill rod is detachably arranged so that the pile lifting mechanism can put the prefabricated core pile into the lower drill rod, an openable and closable drill bit is provided at the bottom of the lower drill rod, during the drilling rod lifting process, the openable and closable drill bit is opened relative to the drilling rod so that the prefabricated core pile is implanted into the borehole, and a grouting pipe is provided on the side of the drill rod for injecting slurry or fluidized solidified soil.

[0008] A construction equipment for combined piles as described above, wherein the pile lifting mechanism includes a support member arranged in a shell, the support member is connected to a lifting assembly, an elastic member is connected between the shell bottom plate and the support member, arc-shaped clamping plates are respectively arranged on both sides of the shell bottom plate to clamp the prefabricated core piles, a driving member is arranged between the shell bottom plate and the support member, the driving member is connected to the arc-shaped clamping plate, and the lifting assembly provides a force to the support member, so that the driving member drives the arc-shaped clamping plate to move relative to clamp the prefabricated core piles.

[0009] In the construction equipment of a combined pile as described above, the driving member includes a gear transmission component, the gear transmission component includes a fan-shaped gear, the fan-shaped gear can be rotatably fixed inside the shell, the fan-shaped gear and the end of the support member are movably connected through a connecting rod assembly, the fan-shaped gear is meshed with a rack, the end of the rack is connected to the arc-shaped clamping plate, the rack is slidably installed in a slide rail, and the slide rail is fixed in the shell.

[0010] In the construction equipment of a combined pile as described above, the connecting rod assembly includes a first connecting rod and a second connecting rod, the first connecting rod is hingedly connected to one end of the support member, the other end of the first connecting rod is hingedly connected to one end of the second connecting rod, and the other end of the second connecting rod is hingedly connected to the sector gear.

[0011] In the construction equipment of a combined pile as described above, the lifting assembly includes a steel wire rope, the steel wire rope is connected to a lifting power source, the lifting power source is installed on the fixing frame, the steel wire rope passes around a pulley arrangement on the top of the fixing frame, and the steel wire rope passes through the shell and is connected to the support member.

[0012] In the construction equipment of a combined pile as described above, the drill rod comprises an upper drill rod and a lower drill rod, the length of the upper drill rod is smaller than the length of the lower drill rod, the length of the upper drill rod is smaller than the length of the lower drill rod, flanges are respectively provided at the top of the upper drill rod and the bottom of the lower drill rod, and fasteners are detachably connected to the two flanges.

[0013] In the construction equipment for combined piles as described above, one side of the openable drill bit is hingedly connected to the bottom of the lower drill rod, and cutting pick teeth are arranged on the surface of the openable drill bit.

[0014] In the construction equipment for combined piles as described above, at least one grouting pipe is arranged on the side of the drill rod, and the bottom of the grouting pipe is located on the side of the lower drill rod.

[0015] In the second aspect, the present invention provides an application of a construction equipment for a combined pile, which is applied to the construction of a combined pile of a fluidized solidified soil pile and a solidified soil prefabricated core pile. The combined pile of the fluidized solidified soil pile and the solidified soil prefabricated core pile includes a core pile, and the core pile includes multiple sections of prefabricated core piles. Adjacent sections of the prefabricated core piles are bonded by cementitious materials. The annular core pile is a fluidized solidified soil pile, and the fluidized solidified soil pile is prefabricated by a curing agent, soil and water.

[0016] In a third aspect, the present invention further provides a construction method of a composite pile, using the construction equipment of the composite pile, comprising the following contents:

[0017] The construction equipment enters the construction site and starts drilling through the drill rod;

[0018] After drilling is completed, remove the drill pipe and lift the drilling rig and upper drill pipe;

[0019] Apply cementitious material on the top of the prefabricated core pile, clamp the prefabricated core pile by the pile hanging mechanism, and put multiple sections of prefabricated core pile into the lower drill rod in sequence;

[0020] After the implantation is completed, a core pile is formed, and the upper drill rod and the lower drill rod are connected. The drill rig lifts the drill rod. During the lifting process of the drill rod, the drill bit can be opened and closed relative to the drill rod so that the prefabricated core pile is implanted in the borehole. A grouting pipe is set on the side of the drill rod to inject slurry or fluidized solidified soil. During the lifting process of the drill rod, a concrete pile or a fluidized solidified soil pile is formed.

[0021] The beneficial effects of the present invention are as follows:

[0022] 1) The present invention provides an overall construction equipment, and the drill rod is detachably arranged. In this way, the drill rod is disassembled after the drilling is completed, and the lower drill rod is kept in the drill hole. The prefabricated core pile is placed in the lower drill rod through the pile hanging mechanism. During the upward lifting of the drill rod, the drill bit can be opened and closed relative to the drill rod so that the prefabricated core pile is implanted in the drill hole. A grouting pipe is arranged on the side of the drill rod to inject slurry or fluidized solidified soil. The overall integrated construction machinery has a series of functions such as drilling, piling, and cast-in-place piles, and has high verticality, no hole collapse, and simple operation, which realizes one-time hole and pile formation by a single machine, high construction efficiency, and effective control of construction costs.

[0023] 2) The overall structure of the present invention is easy to operate and has high construction efficiency. It can realize one-time hole forming and pile forming by a single machine, greatly saving engineering economic cost and time cost, and has good economic and social benefits.

[0024] 3) The pile hoisting and placing mechanism of the present invention has a reasonable structure. The pile hoisting and placing mechanism is provided with a lifting assembly, which is connected to the bottom plate of the shell, and a driving member is provided between the bottom plate of the shell and the support member. In this way, the lifting assembly provides a force to the support member, so that the driving member drives the arc-shaped clamping plate to move relative to clamp the prefabricated core pile; when the lifting assembly releases the support member, the driving member is driven to move in the opposite direction under the action of gravity and the pulling force of the elastic member, thereby releasing the prefabricated core pile.

[0025] 4) Through the provision of construction equipment, the present invention can be used for the construction of a combination of fluidized solidified soil piles and solidified soil prefabricated core piles. This pile type has the characteristics of "soft outside and hard inside", combining the advantages of rigid piles and flexible piles. It not only generates friction resistance through the relatively large surface area of ​​the fluidized solidified soil piles, but also supports the upper load through the combination of solidified soil prefabricated core piles with high compressive strength, thereby increasing its load-bearing capacity and avoiding foundation deformation, while reducing the soil squeezing effect and mud discharge. While ensuring the quality and safety of the project, it reduces the use of cement and reduces carbon emissions. The pile body quality is reliable and easy to supervise, and can replace traditional cement mixing pile composite foundations, screw pile composite foundations, CFG pile (cement fly ash gravel pile) composite foundations, etc. for foundation reinforcement. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0027] Figure 1 It is a schematic diagram of a combined pile of a fluidized solidified soil pile and a solidified soil prefabricated core pile according to one or more embodiments of the present invention.

[0028] Figure 2 A schematic diagram of a construction device for a combined pile according to one or more embodiments of the present invention Figure 1 .

[0029] Figure 3 A schematic diagram of a construction device for a combined pile according to one or more embodiments of the present invention Figure 2 .

[0030] Figure 4 It is a schematic diagram of an upper drill rod and a lower drill rod in a construction device for a combined pile according to one or more embodiments of the present invention when being separated.

[0031] Figure 5 It is a schematic diagram of a construction device for a combined pile placing a prefabricated core pile according to one or more embodiments of the present invention.

[0032] Figure 6 It is an enlarged schematic diagram of a drill rod being lifted in a construction device for a combined pile according to one or more embodiments of the present invention.

[0033] Figure 7 It is an enlarged schematic diagram of a pile hanging mechanism in a construction device for a combined pile according to one or more embodiments of the present invention.

[0034] Figure 8 It is a flow chart of a construction method of a composite pile according to one or more embodiments of the present invention.

[0035] In the figure: the distances or sizes between parts are exaggerated to show the positions of various parts, and the schematic diagram is for reference only.

[0036] Among them: 1. prefabricated core pile; 2. fluidized solidified soil pile; 3. cementitious material; 4. crawler walking mechanism; 5. control room; 6. fixed frame; 7. wire rope; 8. drilling rig; 9. upper drill rod; 10. flange; 11. lower drill rod; 12. grouting pipe; 13. second pulley; 14. shell; 15. pile hanging mechanism; 16. first pulley; 17. counterweight block bin; 18. openable and closable drill bit; 19. grouting nozzle; 20. cutting pick teeth; 21. rotating shaft; 1501. arc splint; 1502. slide rail; 1503. fan gear; 1504. second connecting rod; 1505. first connecting rod; 1506. support; 1507. spring; 1508. rack; 1509. limit block; 1510. shell bottom plate. DETAILED DESCRIPTION

[0037] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0038] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise explicitly stated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof;

[0039] As introduced in the background technology, the existing technology has the problems of low construction efficiency and high cost of composite piles. In order to solve the above technical problems, the present invention proposes a composite pile of fluidized solidified soil piles and solidified soil prefabricated core piles.

[0040] Embodiment 1

[0041] In a typical embodiment of the present invention, reference is made to Figure 2 and Figure 3As shown, a combined pile of a fluidized solidified soil pile and a solidified soil prefabricated core pile comprises a supporting base, the supporting base is provided with a walking mechanism, the supporting base supports a fixed frame 6, the fixed frame 6 supports a drilling rig 8, the drill rod can be raised and lowered relative to the fixed frame, the drilling rig 8 is connected to the hollow drill rod, the fixed frame 6 also supports a pile hanging mechanism 15, the pile hanging mechanism 15 can be raised and lowered relative to the fixed frame 6, the drill rod is detachably arranged so that the pile hanging mechanism 15 puts the prefabricated core pile into the lower drill rod 11, an openable and closable drill bit 18 is provided at the bottom of the lower drill rod 11, during the drilling rod lifting process, the openable and closable drill bit is opened relative to the drilling rod so that the prefabricated core pile is implanted into the borehole, and a grouting pipe is provided on the side of the drilling rod for injecting slurry or fluidized solidified soil.

[0042] Among them, the walking mechanism can be the existing crawler walking mechanism 4, and the support base is also provided with a control component, which is connected to the pile lifting mechanism and the drilling rig respectively. The control component can be a PLC controller or other types of controllers, and the controller is placed in the control room 5. The support base is also provided with retractable legs to ensure the stability of the equipment operation. The support base also supports a counterweight bin 17, and a counterweight can be placed in the counterweight bin 17. If the soil is hard during drilling, the weight of the drilling rig is not enough to withstand the reaction force of the soil, and then a counterweight needs to be added.

[0043] refer to Figure 4 As shown, the drill rod is a spiral drill rod. After the spiral drill rod construction is completed, the inner diameter of the borehole formed is larger than the diameter of the prefabricated core pile 1. The drill rod includes an upper drill rod 9 and a lower drill rod 11. The length of the upper drill rod 9 is smaller than the length of the lower drill rod 11. The upper drill rod 9 and the lower drill rod 11 are detachably connected. The upper drill rod 9 is connected to a drilling rig, and the drilling rig is installed on the fixed frame 6 through an existing lifting mechanism.

[0044] Specifically, flanges 10 are respectively provided at the top of the upper drill rod 9 and the bottom of the lower drill rod 11. The two flanges 10 are detachably connected by fasteners, which are specifically bolts and nuts. The bolts and nuts are removed to separate the upper drill rod from the lower drill rod.

[0045] refer to Figure 6 As shown, one side of the openable and closable drill bit 18 is hingedly connected to the bottom of the lower drill rod 11. The openable and closable drill bit 18 is a conical head protruding downward. One side of the openable and closable drill bit is connected to the lower drill rod through a rotating shaft 21. Cutting pick teeth 20 are arranged on the surface of the openable and closable drill bit 18.

[0046] In addition, multiple grouting pipes 12 are arranged on the side of the drill rod, and a grouting nozzle 19 is arranged at the bottom of the grouting pipe. The interval between two adjacent grouting pipes 12 is set at a set angle. The bottom of the grouting pipe 12 is located on the side of the lower drill rod 11, and the bottom of the grouting pipe can be arranged higher than the bottom end of the lower drill rod.

[0047] refer to Figure 5 and Figure 7 As shown, the pile hanging mechanism 15 includes a support member 1510 arranged in the shell, the support member is connected to the lifting assembly, an elastic member is connected between the shell bottom plate 1510 and the support member 1506, the elastic member is a spring 1507, arc-shaped clamping plates 1501 are respectively arranged on both sides of the shell bottom plate to clamp the prefabricated core pile, a driving member is arranged between the shell bottom plate 1510 and the support member 1506, the driving member is connected to the arc-shaped clamping plates, the arc-shaped clamping plates 1501 on both sides are arranged oppositely, the length of the two arc-shaped clamping plates 1501 is less than the length of the prefabricated core pile 1501, and the lifting assembly provides a force to the support member, so that the driving member drives the arc-shaped clamping plates to move relative to each other to clamp the prefabricated core pile.

[0048] Specifically, the driving member includes a gear transmission component, which includes a fan-shaped gear 1503. The fan-shaped gear can be rotatably fixed inside the shell 14. The fan-shaped gear 1503 is movably connected to the two ends of the support member through connecting rod assemblies. The connecting rod assemblies on both sides of the support member are symmetrically arranged. The fan-shaped gear 1503 is meshed with the rack 1508. The end of the rack 1508 is connected to the arc-shaped clamping plate. The rack 1508 is slidably installed in the slide rail 1502. An open groove is set on the side of the rack. The rack 1508 cooperates with the slide rail through the open groove. The slide rail is fixed to the side wall inside the shell.

[0049] It can be understood that the connecting rod assembly includes a first connecting rod 1505 and a second connecting rod 1504, the first connecting rod 1505 is hingedly connected to one end of the support member, the other end of the first connecting rod 1505 is hingedly connected to one end of the second connecting rod 1504, and the other end of the second connecting rod 1504 is hingedly connected to the fan gear 1503, and the first connecting rod and the second connecting rod are both steel structure rods, so that the movable support member, the first connecting rod, the second connecting rod and the fan gear constitute a crank slider mechanism to drive the rack to move relative to the slide rail.

[0050] In addition, the lifting assembly includes a wire rope 7, one end of which is connected to a lifting power source (such as an electric drum), and the lifting power source is installed on a fixed frame 6. The wire rope 7 is arranged around a first pulley of the fixed frame 6 and a second pulley 13 on the top of the fixed frame. The other end of the wire rope 7 passes through the shell and is connected to the support member. The wire rope 7 can move relative to the shell 14. A limit block 1509 is arranged in the shell. The wire rope 7 passes through the limit block 1509, and the support member 1506 is limited by the limit block 1509. The lifting power source can not only drive the lifting and lowering movement of the wire rope 7 and the shell 14, but also can pull the support member relative to the shell to clamp the prefabricated core pile.

[0051] Specifically, the support member 1506 is a support plate, and the steel wire rope in the shell 14 is circumferentially sleeved with a ring 1511. The limit block 1509 is provided with a slide groove on one side facing the ring, and the ring is movable relative to the slide groove. In this way, when the steel wire rope is tightened, the ring 1511 moves relative to the limit block 1509 and is limited by the limit block.

[0052] The construction equipment provided in this embodiment is that the drill rod is detachably arranged, so that the drill rod is disassembled after the drilling is completed, and the lower drill rod remains in the drill hole. The prefabricated core pile is placed in the lower drill rod through the pile lifting mechanism. During the upward lifting of the drill rod, the drill bit can be opened and closed relative to the drill rod so that the prefabricated core pile is implanted in the drill hole. A grouting pipe is arranged on the side of the drill rod for injecting slurry (concrete slurry) or fluidized solidified soil. The overall integrated construction machinery has a series of functions such as drilling, piling, and cast-in-place piles, and has high verticality, no hole collapse, and simple operation.

[0053] Embodiment 2

[0054] This embodiment provides an application of a construction device for a combined pile in the first embodiment, which is applied to the construction of a combined pile of a fluidized solidified soil pile and a solidified soil prefabricated core pile, with reference to Figure 1 As shown, the combined pile of fluidized solidified soil pile and solidified soil prefabricated core pile includes a core pile, which includes multiple sections of prefabricated core piles 1, and adjacent sections of prefabricated core piles are bonded by cementitious material 3. The annular core pile is a fluidized solidified soil pile 2, which is prefabricated by a curing agent, soil and water.

[0055] Among them, the prefabricated core pile 1 is produced in a standardized manner in the factory, which is easier to supervise the quality and ensure the uniformity and reliability of the pile body. It also has the advantages of low cost and high pile body strength, and has great social value. The materials used for the fluidized solidified soil pile 2 are existing materials. The curing agent, soil and water are mixed by mixing equipment and poured on site. The setting of the fluidized solidified soil pile 2 ensures the adhesion between the fluidized solidified soil pile and the prefabricated core pile and the surrounding soil, and better exerts the side friction resistance of the combined pile of the fluidized solidified soil pile and the solidified soil prefabricated core pile, thereby improving the bearing capacity of the foundation pile.

[0056] Of course, a composite pile construction device can also be used for the construction of composite piles that combine core piles and cast-in-place piles.

[0057] Embodiment 3

[0058] This embodiment provides a construction method for a composite pile, using a construction device for a composite pile as described in the first embodiment, referring to Figure 8 As shown, including the following:

[0059] The site is leveled, construction equipment enters the construction site, and drilling begins using drill rods;

[0060] After drilling is completed, remove the drill pipe and lift the drilling rig and upper drill pipe;

[0061] The cementitious material 3 is applied on the top of the precast core pile 1, and the pile hoisting mechanism 15 clamps the precast core pile 1, and multiple sections of the precast core pile 1 are sequentially inserted into the lower drill rod: specifically, the steel wire rope 7 is lowered to make the arc-shaped clamping plate 1501 located on both sides of the precast core pile 1, and the pile hoisting mechanism 15 is pulled up. At this time, the fan gear 1503 moves inwards under the action of the tension, driving the rack 1508 to move inwards along the slide rail 1502, so that the arc-shaped clamping plate 1501 contracts inwards, grabs the precast core pile 1, and installs the precast core pile 1 through the hollow lower drill rod 11. After the installation is completed, the pile hoisting mechanism 15 is continued to be lowered. At this time, under the action of gravity and the tension of the spring 1507, the fan gear 1503 moves outwards, driving the rack 1508 to move outwards along the slide rail 1502, so that the arc-shaped clamping plate 1501 moves outwards and the precast core pile 1 is released; this is repeated until the precast core pile 1 reaches the designed height;

[0062] After the implantation is completed, a core pile is formed, the drilling rig turntable 8 and the upper drill rod 9 are lowered, and the flange 10 is used to connect them to the lower drill rod 11. When the drill rod is lifted, the drill bit 18 can be opened by gravity, and the core pile is left in the borehole. While the drill rod is lifted, the grouting pipe 12 and the grouting nozzle 19 are used to pour slurry (concrete slurry) or fluidized solidified soil, so that a concrete pile or a fluidized solidified soil pile is formed on the side of the prefabricated core pile until the formed pile, such as the fluidized solidified soil pile 2, reaches the designed height.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A construction equipment for a combined pile, characterized in that: The invention comprises a supporting base, which is provided with a walking mechanism. The supporting base supports a fixed frame, and the fixed frame supports a drilling rig. The drill rod can be raised and lowered relative to the fixed frame, and the drilling rig is connected to the hollow drill rod. The fixed frame also supports a pile hoisting mechanism, and the pile hoisting mechanism can be raised and lowered relative to the fixed frame. The drill rod is detachably arranged so that the pile hoisting mechanism can put the prefabricated core pile into the lower drill rod. An openable and closable drill bit is arranged at the bottom of the lower drill rod. During the lifting process of the drill rod, the openable and closable drill bit is opened relative to the drill rod so that the prefabricated core pile is implanted into the borehole. A grouting pipe is arranged on the side of the drill rod for injecting slurry or fluidized solidified soil.

2. The construction equipment for combined piles according to claim 1, characterized in that: The pile hanging mechanism includes a support member arranged in a shell, the support member is connected to a lifting assembly, an elastic member is connected between a bottom plate of the shell and the support member, arc-shaped clamping plates are respectively arranged on both sides of the bottom plate of the shell to clamp the prefabricated core piles, a driving member is arranged between the bottom plate of the shell and the support member, the driving member is connected to the arc-shaped clamping plates, and the lifting assembly provides a force to the support member, so that the driving member drives the arc-shaped clamping plates to move relative to each other to clamp the prefabricated core piles.

3. The construction equipment of a composite pile according to claim 2, characterized in that: The driving member includes a gear transmission component, which includes a fan-shaped gear. The fan-shaped gear can be rotatably fixed inside the shell. The fan-shaped gear is movably connected to the end of the support member through a connecting rod assembly. The fan-shaped gear is meshed with a rack. The end of the rack is connected to the arc-shaped clamping plate. The rack is slidably installed in a slide rail, and the slide rail is fixed in the shell.

4. The construction equipment for combined piles according to claim 3, characterized in that: The connecting rod assembly includes a first connecting rod and a second connecting rod, the first connecting rod is hingedly connected to one end of the support member, the other end of the first connecting rod is hingedly connected to one end of the second connecting rod, and the other end of the second connecting rod is hingedly connected to the sector gear.

5. The construction equipment for combined piles according to claim 2, characterized in that: The lifting assembly includes a steel wire rope, which is connected to a lifting power source, and the lifting power source is installed on the fixing frame. The steel wire rope passes around a pulley arrangement on the top of the fixing frame, and the steel wire rope passes through the shell and is connected to the support member.

6. The construction equipment for combined piles according to claim 1, characterized in that: The drill rod comprises an upper drill rod and a lower drill rod, the length of the upper drill rod is shorter than that of the lower drill rod, flanges are respectively arranged at the top of the upper drill rod and the bottom of the lower drill rod, and fasteners are detachably connected between the two flanges.

7. The construction equipment for combined piles according to claim 1, characterized in that: One side of the openable and closable drill bit is hingedly connected to the bottom of the lower drill rod, and cutting pick teeth are arranged on the surface of the openable and closable drill bit.

8. The construction equipment for combined piles according to claim 1, characterized in that: A grouting pipe is fixed on the side of the drill rod, and the bottom of the grouting pipe is located on the side of the lower drill rod.

9. Application of the construction equipment of a combined pile according to any one of claims 1 to 8, characterized in that: The invention is applied to the construction of a combination of a fluidized solidified soil pile and a solidified soil prefabricated core pile. The combination of a fluidized solidified soil pile and a solidified soil prefabricated core pile includes a core pile. The core pile includes multiple sections of prefabricated core piles. Two adjacent sections of prefabricated core piles are bonded by cementitious materials. The annular core pile is a fluidized solidified soil pile. The fluidized solidified soil pile is prefabricated by a curing agent, soil and water.

10. A construction method for a composite pile, characterized in that: A construction device using a combined pile according to any one of claims 1 to 8, comprising the following contents: The construction equipment enters the construction site and starts drilling through the drill rod; After drilling is completed, remove the drill pipe and lift the drilling rig and upper drill pipe; Apply cementitious material on the top of the prefabricated core pile, clamp the prefabricated core pile by the pile hanging mechanism, and put multiple sections of prefabricated core pile into the lower drill rod in sequence; After the implantation is completed, a core pile is formed, and the upper drill rod and the lower drill rod are connected. The drill rig lifts the drill rod. During the lifting process of the drill rod, the drill bit can be opened and closed relative to the drill rod so that the prefabricated core pile is implanted in the borehole. A grouting pipe is set on the side of the drill rod to inject slurry or fluidized solidified soil. During the lifting process of the drill rod, a concrete pile or a fluidized solidified soil pile is formed.

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