Pile-forming machine for fabricated stiff-core composite pile

Abstract

The application discloses a kind of assembled stiff core composite pile pile-forming machinery, belong to highway construction technical field, including mobile car body and pile-forming mechanism, mobile car body includes heavy load chassis, is set on the rotating seat of heavy load chassis and is fixedly connected on the support chassis of rotating seat, support chassis one end is provided with counterweight seat and cab;Pile-forming mechanism is arranged at the other end of support chassis, including support base and tower, the top of tower is provided with driving mechanism, the power output shaft of driving mechanism is fixedly connected with drill pipe top by shaft sleeve;Drill pipe includes the core pile forming sleeve with built-in concrete flow passage, the center conduit with cement slurry flow passage is arranged in core pile forming sleeve, multiple cutting blades are spirally distributed along the lower part of core pile forming sleeve circumference, and drill pipe lower end is provided with drill bit.The application can improve the carrying capacity of pile-forming mechanism, improve the pile-forming efficiency of stiff core composite pile.

Description

Technical Field

[0001] This application belongs to the field of highway construction technology, and in particular relates to a prefabricated core composite pile forming machine. Background Technology

[0002] Highway engineering refers to all work related to the planning, design, construction, maintenance, and repair of structures that cross waterways, valleys, and all transportation routes. Highway construction generally includes surface treatment of the original pavement structure, construction of the subgrade structure on the treated original pavement structure, and construction of the pavement structure on the subgrade structure. Among these, the subgrade and the original pavement structure, as the main load-bearing structures of the pavement structure, should have sufficient strength, stability, and durability.

[0003] However, the original road surface structures vary greatly during construction. For example, coastal cities and inland river basins have large areas of soft soil layers such as silt or silty soil, which have insufficient bearing capacity and stability. As a foundation, it will experience significant settlement and deformation during later construction. In order to meet the bearing capacity and settlement control requirements of the roadbed and pavement structure, it is necessary to reinforce the foundation to ensure the normal use and safety of the highway.

[0004] In existing technologies, cement-soil mixing piles are mostly used for soft soil foundations. Cement powder or cement slurry is sprayed into the soft soil matrix and then mixed with the soft soil to form cement-soil piles with a certain strength. This can improve the bearing capacity of the foundation and reduce post-construction settlement to a certain extent. However, there are many problems in the construction process, such as poor pile quality, uneven mixing and pile breakage in the later stage, resulting in limited reinforcement effect.

[0005] To address the numerous problems encountered during the construction of cement-soil mixing piles, existing processes employ the reinforced core composite pile method to improve the treatment quality of soft soil foundations. In soft soil foundation treatment, the main body of the mixing pile machine first constructs cement-soil mixing piles, followed by the static pressure pile machine to statically press precast core piles into the mixing piles, thereby increasing the bearing capacity of the cement-soil mixing piles. This construction method typically requires the mixing piles to be constructed first, followed by the pressing of the core piles, resulting in alternating operation of the construction machinery and preventing one-time pile formation. The pile-forming machinery also has a complex structure and high manufacturing costs. Furthermore, on soft soil foundations, existing construction machinery is prone to subsidence, affecting the pile formation quality of the reinforced core composite piles. Summary of the Invention

[0006] Purpose of the invention: The purpose of this application is to provide a prefabricated core composite pile forming machine to improve the load-bearing capacity of the pile forming machine and improve the pile forming efficiency of the core composite pile.

[0007] Technical solution: The present application describes a prefabricated core-reinforced composite pile forming machine, the pile forming machine comprising:

[0008] The mobile vehicle body includes a heavy-duty chassis, on which a rotating seat and a supporting chassis are fixedly mounted. One end of the supporting chassis is provided with a counterweight seat and a driver's cab. The front and rear ends of the heavy-duty chassis are respectively fixedly provided with balance outriggers.

[0009] The pile-forming mechanism includes a support base fixedly mounted on the side of the support chassis away from the cab and a tower fixedly connected to the support base. A drive mechanism is provided on the top of the tower on the side away from the cab. The power output shaft of the drive mechanism is fixedly connected to the top of the drill rod through a bushing. The drill rod is a core pile forming sleeve with a built-in concrete flow channel. A central guide tube with a cement slurry flow channel is provided inside the core pile forming sleeve. Multiple cutting blades are spirally distributed along the lower circumference of the core pile forming sleeve, and a drill bit is provided at the lower end of the drill rod.

[0010] Preferably, the lower end of the core pile forming sleeve is provided with a cement grout spraying port that communicates with the central conduit, and the top end of the central conduit is connected to a cement grout pumping station set on the support base through a cement grout conveying pipe.

[0011] Preferably, the top of the core pile forming sleeve is connected to a concrete pump station set on the support base via a concrete conveying pipe.

[0012] Preferably, a winch mechanism is provided at the end of the counterweight base, and a steel strand is wound on the winch mechanism. The free end of the steel strand passes around the pulley assembly provided at the top of the tower and is fixedly connected to the top of the drive mechanism. The winch mechanism pulls the drive mechanism and the drill rod to perform lifting and lowering actions through the steel strand.

[0013] Preferably, the outrigger includes a support beam fixedly connected to the end beam of the heavy-duty chassis and support side beams fixedly connected to both ends of the support beam. The outer end of the support side beam is provided with a support sleeve, and a hydraulic lifting drive mechanism is supported on the support sleeve. The lower end of the hydraulic lifting drive mechanism is connected to a foot seat to increase the contact area.

[0014] Preferably, the hydraulic lifting drive mechanism includes a hydraulic cylinder fitted inside a support sleeve and an oil pump disposed at the top of the hydraulic cylinder. A piston rod is connected to the lower end of the hydraulic cylinder, and the foot is fixedly connected to the lower end of the piston rod.

[0015] Preferably, the foot support includes a foot support base plate and a foot support housing fastened to the foot support base plate, and a plurality of anti-settlement support leg assemblies are arranged circumferentially on the foot support base plate;

[0016] The anti-settlement outrigger assembly includes a first support vertical plate and a drive push rod that extends horizontally on the first support vertical plate. The outer end of the drive push rod is vertically provided with a drive crossbar. Several side outriggers are vertically provided at equal intervals along the drive crossbar. The outer end of the side outriggers is provided with a foot pad.

[0017] The foot base housing is provided with a leg through hole in the circumference for the side support leg to pass through. A pushing mechanism is provided in cooperation with the drive push rod. The pushing mechanism can push the drive push rod forward or backward, thereby pushing the side support leg to move outward along the foot base housing.

[0018] Preferably, the pushing mechanism includes a transverse drive cylinder disposed on one side of the first support vertical plate, a support arm disposed on one side of the drive push rod, and the piston rod at the front end of the transverse drive cylinder is hinged to one end of the support arm.

[0019] Preferably, a second support vertical plate is provided on the foot base plate corresponding to the anti-settlement support leg assembly. The second support vertical plate is provided on the front side of the drive crossbar, and the second support vertical plate is provided with a support leg through hole for the side support leg to pass through.

[0020] Preferably, the foot base has a triangular structure, and each side of the foot base plate is provided with a set of anti-settlement support leg assemblies.

[0021] Compared with the prior art, this application has at least the following beneficial effects:

[0022] 1. The pile-forming mechanism of this application uses a drive mechanism to rotate the drill rod. The core pile forming sleeve breaks up the soft foundation through its circumferentially arranged cutting blades. The concrete pumping station pumps concrete into the soft soil layer through the concrete delivery pipeline and concrete flow channel for uniform mixing, thus completing the pile formation of the concrete mixing pile. During the construction of the concrete mixing pile, the cement slurry pumping station pumps cement slurry into the center position of the concrete mixing pile through the cement slurry delivery pipeline to construct the core pile. After the concrete mixing pile and the core pile are consolidated, the efficient construction of the core composite pile is completed. This pile-forming mechanism has the advantages of simple structure, high construction efficiency, and low cost.

[0023] 2. The heavy-duty chassis used in this pile-driving machine can adopt a tracked structure or a heavy-duty wheeled structure to improve the overall load-bearing capacity of the pile-driving machine; a balance leg is set in conjunction with the heavy-duty chassis. The foot seat of the balance leg can form a stable support structure with the soft foundation after the anti-settlement leg assembly is spread out, thereby improving the overall anti-settlement performance of the pile-driving machine, reducing the settlement during construction on soft foundations, and improving the construction quality of the core composite pile. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the pile-forming mechanical structure of this application;

[0025] Figure 2 for Figure 1 Left view of the pile driving mechanism structure;

[0026] Figure 3 for Figure 2 Top view of the drill pipe structure;

[0027] Figure 4 for Figure 1 End view of the central balancing support leg structure;

[0028] Figure 5 for Figure 4 Schematic diagram of the middle support in its retracted state;

[0029] Figure 6 for Figure 4 Schematic diagram of the middle leg base in the open position;

[0030] Figure 7 for Figure 5 Or a schematic diagram of the layout structure of the internal anti-slip side support leg assembly of the 6-leg base;

[0031] Figure 8 for Figure 7 Schematic diagram of the anti-slip side support leg assembly.

[0032] Reference numerals: 100. Pile-forming machinery; 1. Mobile vehicle body; 11. Heavy-duty chassis; 12. Rotary seat; 13. Support chassis; 14. Counterweight seat; 15. Cab; 16. Winch mechanism; 2. Pile-forming mechanism; 21. Support base; 22. Tower; 23. Anchor brace; 24. Drive mechanism; 25. Bushing; 26. Drill rod; 261. Drill bit; 262. Core pile forming sleeve; 263. Cutting blade; 264. Central guide tube; 265. Concrete flow channel; 266. Cement slurry flow channel; 27. Concrete pump station; 28. Cement slurry pump station; 29. 1. Steel strand; 3. Balance outriggers; 31. Support beam; 32. Support side beam; 33. Support sleeve; 4. Hydraulic lifting drive mechanism; 41. Hydraulic cylinder; 42. Oil pump; 43. Piston rod; 5. Foot; 51. Foot housing; 511. Mounting hole; 512. Outrigger through hole; 52. Anti-settlement outrigger assembly; 521. First support vertical plate; 522. Drive push rod; 523. Support arm; 524. Lateral drive cylinder; 525. Drive crossbar; 526. Second support vertical plate; 527. Side outrigger; 528. Foot pad; 53. Foot base plate. Detailed Implementation

[0033] To make the purpose, technical solution, and advantages of this application clearer, the following will be described in conjunction with the appendix. Figures 1-8The technical solutions of this application are clearly and completely described. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the described embodiments of this application are within the scope of protection of this application.

[0034] like Figure 1 In this embodiment, a prefabricated composite pile driving machine 100 disclosed in this application includes a mobile vehicle body 1 and a pile driving mechanism 2. The mobile vehicle body 1 includes a heavy-duty chassis 11, a rotating seat 12 fixedly mounted on the heavy-duty chassis 11, and a support chassis 13 fixedly connected to the rotating seat 12. A counterweight seat 14 and a driver's cab 15 are provided at one end of the support chassis 13. The pile driving mechanism 2 is fixedly mounted at the end of the support chassis 13 away from the driver's cab. The support chassis 13 and its upper structure can be controlled to rotate along the rotating seat 12 through the driver's cab 15, facilitating the adjustment of the pile driving position of the pile driving mechanism 2. The heavy-duty chassis 11 can adopt a tracked structure or a heavy-duty wheeled structure to improve the overall load-bearing capacity of the pile driving machine 100 and reduce its settlement during construction on soft foundations, thereby improving construction quality.

[0035] like Figures 1-3In the embodiment shown, the pile-forming mechanism 2 includes a support base 21 fixedly installed on the support chassis 13 at the end away from the cab, and a tower 22 fixedly connected to the support base. An anchor brace 23 connected to the support base 21 is provided on one side of the tower 22 to improve the structural strength of the tower. A drive mechanism 24 is provided on the top of the tower 22 on the side away from the cab 15. The drive mechanism 24 can use a servo motor or a stepper motor to realize the power output function. The power output shaft of the drive mechanism 24 is fixedly connected to the top of the drill rod 26 through a bushing 25. The drill rod 26 is a hollow tube structure, containing a core pile forming sleeve 262 with a concrete flow channel 265. A central guide tube 264 with a cement slurry flow channel 266 is installed inside the core pile forming sleeve 262. A cement slurry injection port connected to the central guide tube 264 is located at the lower end of the core pile forming sleeve 262. The top end of the central guide tube 264 is connected to a cement slurry pump station 28 located on the support base 21 via a cement slurry delivery pipe. The top end of the core pile forming sleeve 262 is connected to a concrete pump station 27 located on the support base 21 via a concrete delivery pipe. Multiple cutting blades 263 are spirally distributed along the lower circumference of the core pile forming sleeve 262, and a drill bit 261 is located at the lower end of the drill rod 26. During construction, the drive mechanism rotates the drill rod, and the core pile forming sleeve breaks up the soft foundation through its circumferentially arranged cutting blades. The concrete pumping station pumps concrete into the soft soil layer through the concrete delivery pipeline and concrete flow channel for uniform mixing, thus completing the concrete mixing pile construction. Simultaneously, during the concrete mixing pile construction, the cement slurry pumping station pumps cement slurry into the center of the concrete mixing pile through the cement slurry delivery pipeline to construct the core pile. After the concrete mixing pile and the core pile are consolidated, the efficient construction of the core composite pile is completed. This type of pile forming mechanism has the advantages of simple structure, high construction efficiency, and low cost.

[0036] A winch mechanism 16 is provided at the end of the counterweight seat 14. This winch mechanism can improve the overall stability of the pile-forming machine 100 and prevent the pile-forming mechanism 2 from causing the moving vehicle 1 to overturn due to instability of the center of gravity during construction. A steel strand 29 is wound on the winch mechanism 16. The free end of the steel strand 29 passes around the pulley assembly at the top of the tower 22 and is fixedly connected to the top of the drive mechanism 24. The winch mechanism 16 pulls the drive mechanism 24 and the drill rod 26 to perform lifting and lowering actions through the steel strand 29, thereby cooperating with the drilling rod to drill into the soil or lift it.

[0037] like Figure 4In the illustrated embodiment, balance legs 3 are fixedly installed at the front and rear ends of the heavy-duty chassis 11, respectively. Each balance leg 3 includes a support beam 31 fixedly connected to the end beam of the heavy-duty chassis 11 and support side beams 32 fixedly connected to both ends of the support beam 31. A support sleeve 33 is provided at the outer end of each support side beam 32. A hydraulic lifting drive mechanism 4 is supported on the support sleeve 33. The hydraulic lifting drive mechanism 4 includes a hydraulic cylinder 41 fitted inside the support sleeve 33 and an oil pump 42 located at the top of the hydraulic cylinder 41. The lower end of the hydraulic cylinder 41 is connected to… A piston rod 43 is connected to the bottom of the piston rod 43, and a foot 5 is fixedly connected to increase the contact area. The top of the foot 5 is provided with a mounting hole 511 for connecting with the piston rod. The hydraulic cylinder 41 can move up and down through the piston rod 43 at its lower end, thereby driving the foot 5 to move up and down. When the pile-forming machine needs to move, the hydraulic cylinder retracts the piston rod to drive the foot to disengage from the soft foundation. When the pile-forming machine needs to construct a core composite pile, the hydraulic cylinder extends the piston rod to drive the foot to support and sink into the soft foundation to form a stable support.

[0038] like Figures 5-7 In the illustrated embodiment, the foot support 5 includes a foot support base plate 53 and a foot support housing 51 fastened to the foot support base plate. Multiple sets of anti-settlement support leg assemblies 52 are circumferentially arranged on the foot support base plate 53. In a specific embodiment, the foot support 5 has a triangular structure, with a set of anti-settlement support leg assemblies 52 on each side of the foot support base plate 53. This type of foot support 5, after the anti-settlement support leg assemblies 52 are extended, can form a stable support structure with the soft foundation, improving the overall anti-settlement performance of the pile-forming machinery and further improving the pile-forming quality.

[0039] like Figure 8In the illustrated embodiment, the anti-settlement outrigger assembly 52 includes a first supporting vertical plate 521 and a horizontally telescopic drive push rod 522 on the first supporting vertical plate. A drive crossbar 525 is vertically mounted at the outer end of the drive push rod 522. Three side outriggers 527 are vertically mounted at equal intervals along the drive crossbar 525. Foot pads 528 are mounted at the outer ends of the side outriggers 527 to increase the contact area with the soft foundation. Outrigger through holes 512 for the side outriggers 527 to pass through are provided circumferentially around the foot base housing 51. A pushing mechanism is provided in cooperation with the drive push rod 522. The pushing mechanism includes a transverse drive cylinder 524 mounted on one side of the first supporting vertical plate 521, and a support arm 523 mounted on one side of the drive push rod 522. The piston rod at the front end of the transverse drive cylinder 524 is hinged to one end of the support arm 523. A second support vertical plate 526 is provided on the base plate 53 corresponding to the anti-settlement outrigger assembly 52. ​​The second support vertical plate 526 is located on the front side of the drive crossbar 525, and has outrigger through holes for the side outriggers 527 to pass through. When the base needs to provide support, the hydraulic lifting drive mechanism first drives the base downward and supports it on the soft foundation. Then, the transverse drive cylinder pushes the drive push rod to move outward, thereby driving the side outriggers to insert into the soil of the soft foundation. This effectively increases the contact area and bonding force between the base and the soft foundation, thus giving the pile driving machine a strong anti-settlement capability. When the base needs to be pulled out, the side outriggers of the anti-settlement outrigger assembly can be freely extended and retracted and hidden in the base housing. This reduces the lifting resistance of the base when it is pulled out, making it easier to pull out the base.

[0040] The above are preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A prefabricated core-reinforced composite pile forming machine, characterized in that, The pile-forming machinery (100) includes: The mobile vehicle body (1) includes a heavy-duty chassis (11), a rotating seat (12) and a supporting chassis (13) fixedly connected to the rotating seat (12) are fixedly mounted on the heavy-duty chassis (11), and a counterweight seat (14) and a driver's cab (15) are provided at one end of the supporting chassis (13); the front and rear ends of the heavy-duty chassis (11) are respectively fixedly mounted with balance outriggers (3); The pile forming mechanism (2) includes a support base (21) fixedly installed on the support chassis (13) at the end away from the cab and a tower (22) fixedly connected to the support base. A drive mechanism (24) is provided on the top of the tower (22) on the side away from the cab (15). The power output shaft of the drive mechanism (24) is fixedly connected to the top of the drill rod (26) through a bushing (25). The drill rod (26) is a core pile forming sleeve (262) with a concrete flow channel (265) inside. A central guide tube (264) with a cement slurry flow channel (266) is provided inside the core pile forming sleeve (262). Multiple cutting blades (263) are spirally distributed along the lower circumference of the core pile forming sleeve (262). A drill bit (261) is provided at the lower end of the drill rod (26). The balance support leg (3) includes a support crossbeam (31) fixedly connected to the end beam of the heavy-duty chassis (11) and support side beams (32) fixedly connected to both ends of the support crossbeam (31). The outer end of the support side beam (32) is provided with a support sleeve (33). A hydraulic lifting drive mechanism (4) is supported on the support sleeve (33). The lower end of the hydraulic lifting drive mechanism (4) is connected with a foot seat (5) to increase the contact area. The foot (5) includes a foot base plate (53) and a foot shell (51) fastened to the foot base plate. The foot base plate (53) is provided with a number of anti-settlement support leg assemblies (52) in the circumferential direction. The anti-settlement outrigger assembly (52) includes a first support vertical plate (521) and a drive push rod (522) that extends horizontally on the first support vertical plate. The outer end of the drive push rod (522) is provided with a drive crossbar (525), and a plurality of side outriggers (527) are provided at equal intervals along the drive crossbar (525). The outer end of the side outriggers (527) is provided with a foot pad (528). The foot seat housing (51) is provided with a leg through hole (512) for the side support leg (527) to pass through in the circumferential direction. A pushing mechanism is provided in cooperation with the drive push rod (522). The pushing mechanism can push the drive push rod (522) forward or backward, thereby pushing the side support leg (527) to move outward along the foot seat housing (51).

2. The prefabricated core composite pile forming machine according to claim 1, characterized in that, The lower end of the core pile forming sleeve (262) is provided with a cement slurry spraying port that is connected to the central conduit (264). The top end of the central conduit (264) is connected to the cement slurry pump station (28) set on the support base (21) through a cement slurry conveying pipe.

3. The prefabricated core composite pile forming machine according to claim 2, characterized in that, The top of the core pile forming sleeve (262) is connected to the concrete pump station (27) set on the support base (21) through a concrete conveying pipe.

4. The prefabricated core composite pile forming machine according to claim 1, characterized in that, The counterweight (14) is provided with a winch mechanism (16) at its end. A steel strand (29) is wound around the winch mechanism (16). The free end of the steel strand (29) passes around the pulley assembly provided at the top of the tower (22) and is fixedly connected to the top of the drive mechanism (24). The winch mechanism (16) pulls the drive mechanism (24) and the drill rod (26) to perform lifting and lowering actions through the steel strand (29).

5. The prefabricated core composite pile forming machine according to claim 1, characterized in that, The hydraulic lifting drive mechanism (4) includes a hydraulic cylinder (41) fitted inside a support sleeve (33) and an oil pump (42) located at the top of the hydraulic cylinder (41). The lower end of the hydraulic cylinder (41) is connected to a piston rod (43), and the foot (5) is fixedly connected to the lower end of the piston rod (43).

6. The prefabricated core composite pile forming machine according to claim 1, characterized in that, The pushing mechanism includes a transverse drive cylinder (524) provided on one side of the first support vertical plate (521), and a support arm (523) provided on one side of the drive push rod (522). The piston rod at the front end of the transverse drive cylinder (524) is hinged to one end of the support arm (523).

7. The prefabricated core composite pile forming machine according to claim 1, characterized in that, The foot base plate (53) is provided with a second support vertical plate (526) corresponding to the anti-settlement support leg assembly (52). The second support vertical plate (526) is provided on the front side of the drive crossbar (525), and the second support vertical plate (526) is provided with a support leg through hole for the side support leg (527) to pass through.

8. The prefabricated core composite pile forming machine according to claim 6 or 7, characterized in that, The foot (5) has a triangular structure, and each side of the foot base plate (53) is provided with a set of anti-settlement support leg components (52).

Images