Portable pile driving machine and construction method of cast-in-place pile

Abstract

To provide a portable pile driving machine and a construction method of a cast-in-place pile which relieve technical problems that it becomes difficult to connect a drill pipe in a pile driving machine, and it is less likely to secure stability.SOLUTION: A portal pile driving machine includes a portal frame, a pile frame platform, a moving assembly, and a lift assembly, wherein a power head is mounted on the portal frame vertically arranged on one side of the pile frame platform, projection of a moving head central shaft in the pile frame platform where a material supply position is installed is in an extension direction of the material supply position, the moving assembly is installed on one side or both sides of the material supply position, a plurality of drill pipes are horizontal to the moving assembly and are vertical to a plane where the portal frame exists, the lift assembly includes a pickup component, and the lift assembly is used so as to switch the drill pipe to an upright state from a horizontal state and move the drill pipe to the lower side of the power head.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to the field of pile foundation construction technology, and in particular to a portal pile driver and a construction method for cast-in-place piles. [Background technology]

[0002] Pile foundation work is a separate construction work item, the purpose of which is to increase the bearing capacity of the natural soil body of the building ground by adding pile foundations, or to transfer the load of the upper part of the building directly to the solid and strong soil layer through pile foundations, so that the bearing capacity of the building ground meets safety requirements.

[0003] Pile foundations are rod members made of concrete, steel and other materials with stress performance, and are usually cylindrical or rectangular, but in recent years, deformed pile foundations with full-length threads, partial threads and partial expansion bodies have also been developed. Based on the construction process, pile foundations are divided into two types: precast piles and cast-in-place piles. Precast piles refer to pile foundations that are prefabricated outside the construction area, while cast-in-place piles are pile foundations that are constructed by drilling holes in the construction area and pouring concrete into them.

[0004] Among them, the machine used for the construction of cast-in-place piles is a pile driver, which is equipped with a hollow drill, which is used to drill holes downward in the soil body of the construction area, and in the process of lifting the drill, which is used to form a concrete injection channel, and the drill can be used to form the injection concrete (or other injection concrete material) by primary molding to form a pile foundation. Pile drivers are classified into two categories, both at home and abroad. One category is a conventional pile driver whose pile driver stand and drill length meet the pile foundation design requirements. During operation, the drill of the pile driver needs to be vertical to the ground, and then the drill is used to drill holes downward, and then the drill is lifted up to form the pile by casting the concrete in place. At this time, the pile driver stand for supporting the drill and the overall length of the drill must be higher than the design pile length. The other category is a pile driver whose pile driver stand is supplemented by lining up multiple drill pipes on one side to meet the pile foundation design requirements. Specifically, a drill pipe with a drill is installed on the pile driver stand, and one or more supplementary drill pipes are set up in parallel on one side of the existing drill pipe on the pile driver stand to connect with the existing drill pipe when the drilling depth is insufficient. The former is a new type of pile driver that has more mature construction applications and occupies a wide market, while the latter is a new type of pile driver that has appeared in the last 10 years, such as the pile drivers disclosed in CN216381270U, ​​CN105756060A, and CN107023267B.

[0005] Among them, the conventional pile driver, which is the first category, is limited by the total length of the pile driver's pillar and drill, so the height of the pillar and drill above it has not yet broken through the precedent of 80 meters. For example, if the pile foundation length is designed to be 60 meters, the total length of the drill needs to be 60 meters or more. Since the pile foundation needs to be further equipped with a guide rail that facilitates drilling down and lifting up, the pillar to support the guide rail becomes longer. In addition, since the pillar needs to be vertical to the ground during drilling, the pillar also has a power head weighing 10 to 20 tons in addition to the drill. Therefore, when the conventional pile driver works, it forms a structure with a towering pillar of tens of meters or more, and when the power head is at the tip of the pillar, the center of gravity of the entire pile driver is extremely high, and as a result, it is not uncommon for the pile driver to collapse. Based on this, the conventional pile driver with a pillar that is too high is prohibited from use in some areas.

[0006] The second category pile driver uses a process of arranging multiple drill pipes vertically in advance and then connecting them to the drill pipes, which can reduce the height of the pile driver column. This can reduce the risk of collapse. However, at present, this type of pile driver is mainly used in the construction process of light-weight small-diameter pile foundations, and the drill pipes used in the pile foundations can often be lifted by one person. When constructing a pile foundation with a construction diameter of 400 mm or more, the length and weight of each drill pipe in the drill also increase correspondingly (the weight of the drill pipe is dozens of times or more than the drill pipe used during the construction of the light-weight small-diameter pile foundation, weighing 3 to 6 tons). Therefore, CN216381270U, ​​CN105756060A, and CN107023267B disclose a solution of setting up a spare drill pipe for use, but in actual application, since the drill pipe is a heavy part, each upright drill pipe weighs several tons. Therefore, the center of gravity of the drill is high, the stability is low, and the drill is likely to tip over and cause injury. In addition, the drill increases the strength requirements for the vertical support mechanism of the pile driver, and more materials are used, resulting in higher costs. Therefore, the current pile driver is still difficult to meet the construction requirements for heavy-duty large-diameter pile foundations, and the contact area between the drill and the pile driver body is small when standing upright, so the compression of the stress concentration area is large, and the structural strength of the pile driver itself equipped with a heavy-duty drill is also greatly increased.

[0007] As for the second type of pile driver, CN202688997U discloses a dual-purpose long spiral fully automatic pile driver, which can increase the pile driving depth by 15 meters without increasing the pile driver height. However, it only discloses a standpost mechanism that can rotate on its axis to switch between the drilling and cage placement states, and does not disclose how to improve the drill and how the spare drill pipe connects with the existing drill pipe. CN208950504U discloses a combined power drilling pile driver, which arranges two sets of power heads and drill systems along the vertical direction of the standpost, and after the first set of drills is exhausted in the power head system stroke, the drills are separated from the power head, and then a slide rail device is used to connect the first set of drills with the second set of power heads and drill systems to increase the pile driving depth. However, the method of increasing the power heads and drill systems further increases the weight of the standpost tip. This increases the possibility of the pile driver causing a tip-over accident, and the power head is usually the most expensive part of the pile driver, so two sets of power heads will undoubtedly increase the manufacturing cost of the pile driver significantly. CN209556966U discloses an automated drilling rig base device for an offshore platform, which transports tubing to a mechanical arm by a tubing supply mechanism, and then lifts the tubing by the mechanical arm and sends it to the well. In this process, other auxiliary devices are also required to realize the continuous supply of tubing, but since tubing is a lightweight part, a single 6-8 meter long drill on the pile driver weighs about 4-6 tons, and if the drill is transported using the disclosed tubing transport method, i.e., the transport method of naturally falling into the mechanical arm and well, it will damage the mechanical structure of the pile driver and the drill. The tubing transportation method disclosed in CN209556966U is not applicable to heavy pile drivers, since the transportation method disclosed therein further requires auxiliary machinery such as cranes and labor, which significantly increases the cost. Also, in order to ensure the balance of the pile driver, a counterweight device is proposed in CN110939132A.The oil cylinder can be adjusted to change the filling space of the outer frame of the counterweight, and at the same time, the counterweight block can be increased or decreased to ensure the perpendicularity of the equipment. However, the process of increasing or decreasing the counterweight block is complicated, which not only takes time and effort, but also requires other auxiliary machinery, which greatly affects the continuity of pile driving construction and increases the cost.

[0008] Based on this, from the viewpoint of safety and reliability, currently, there is no reliable technology to solve the problem of realizing stable connection of drill pipes and ensuring the stability of a pile driver equipped with a heavy drill even when multiple drill pipes are pre-arranged, and therefore, realizing smooth drill pipe connection and maintaining the stability of the pile driver in a pile driver equipped with a heavy drill remains a difficult technical problem to overcome. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] CN216381270U [Patent Document 2] CN105756060A [Patent Document 3] CN107023267B [Patent Document 4] CN202688997U [Patent Document 5] CN208950504U [Patent Document 6] CN209556966U [Patent Document 7] CN110939132A Summary of the Invention [Problem to be solved by the invention]

[0010] The present invention aims to provide a portal pile driver and a construction method for cast-in-place piles, which alleviates the technical problems in the prior art, that is, when the existing pile driver is provided with multiple upright drill pipes arranged side by side with the existing drill pipes on one side of the upright pillar, and is applied to the large-diameter, heavy-duty pile foundation construction process, the weight and length of each drill pipe must be increased accordingly, which makes the connection process of the drill pipes in the pile driver difficult and makes it difficult to ensure the stability of the pile driver. [Means for solving the problem]

[0011] The portal pile driver of the present invention includes a portal frame, a pile frame platform, a moving assembly, and a lift assembly, the portal frame being disposed vertically on one side of the pile frame platform, a power head that can be raised and lowered is attached to the portal frame, the power head is detachably connected to one end of any of the drill pipes that move below it, a material supply position is provided on the pile frame platform at a position on the side of the portal frame, a projection of a central axis of the power head on the pile frame platform is in an extension direction of the material supply position, the moving assembly is provided on one or both sides of the material supply position, and a plurality of drill pipes are attached to the moving assembly. The drill pipes are arranged horizontally, and each of the drill pipes is perpendicular to the plane of the portal frame, the moving assembly is used to move in a horizontal plane in a direction parallel to the plane of the portal frame and transport the multiple drill pipes sequentially to the material supply position, the lift assembly includes a pick-up part, which is used to grab the drill pipe at the material supply position, and the lift assembly is used to rotate relative to the pile frame platform and, during rotation, switch the drill pipe grabbed by the pick-up part from a horizontal state to an upright state and move it below the power head.

[0012] In the present invention, the moving assembly includes a plurality of slide mechanisms, which are arranged at intervals in a direction perpendicular to a plane of the gantry frame, and the plurality of slide mechanisms are used to support and move a plurality of the drill pipes, and the pickup parts at the material supply position and the plurality of slide mechanisms are alternately arranged in the direction perpendicular to the plane of the gantry frame.

[0013] Also, in the present invention, the slide mechanism is a telescopic structure, and the slide mechanism is used to raise and lower the drill pipe it supports in the telescopic process.

[0014] In addition, in the present invention, a plurality of guide rails are installed on the pile frame platform, the plurality of guide rails are spaced apart in a direction perpendicular to a plane of the portal frame, and all of the guide rails extend in a direction parallel to the plane of the portal frame, and the plurality of slide mechanisms are slidably connected to the plurality of guide rails in one-to-one correspondence.

[0015] In addition, in the present invention, a first locking position and a second locking position are provided at intervals on each of the slide mechanisms, the first locking positions of the multiple slide mechanisms are arranged on the same straight line to support the same drill pipe, and the second locking positions of the multiple slide mechanisms are arranged on the same straight line to support the same drill pipe.

[0016] In addition, in the present invention, the lift assembly includes a mechanical arm and a lift-up drive mechanism, the pick-up part is a mechanical chuck, the mechanical arm includes a hinged end and an unconnected end, the hinged end of the mechanical arm is hingedly connected to the pile frame platform, the unconnected end of the mechanical arm is hanging, the mechanical chuck is attached to the mechanical arm, the output end of the lift-up drive mechanism is connected to the mechanical arm, and the lift-up drive mechanism is used to drive the mechanical arm to rotate relative to the pile frame platform and switch the mechanical arm between a horizontal state and an upright state.

[0017] In addition, in the present invention, the hinge connection end of the mechanical arm is located between the gantry frame and the material supply position, and the mechanical chuck is attached to the arm surface of the mechanical arm facing away from the pile frame platform, or the mechanical chuck is attached to the arm surface of the mechanical arm facing the pile frame platform, and a turntable mechanism is attached to the pile frame platform, and the hinge connection end of the mechanical arm is hingedly connected to the turntable mechanism, and the turntable mechanism is used to drive the mechanical arm and rotate it around its central axis as a rotation axis.

[0018] In addition, in the present invention, an extension frame is connected to the side of the pile frame platform where the portal frame is installed, and the hinge connection end of the mechanical arm is hingedly connected to the extension frame, and the mechanical arm can stand upright on the side of the portal frame opposite to the material supply position after passing through the portal frame in the process of rotating relative to the pile frame platform, and the mechanical chuck is attached to the arm surface of the mechanical arm facing the pile frame platform.

[0019] In addition, the present invention further includes a self-adjusting counterweight assembly, a monitoring system and a control system, wherein the self-adjusting counterweight assembly is mounted on the other side of the pile frame platform, which is farther away from the portal frame, and the self-adjusting counterweight assembly includes a moving part that can move in a direction perpendicular to the plane of the portal frame, and the self-adjusting counterweight assembly and the monitoring system are all connected to the control system, the monitoring system is used to monitor the weight change in the portal frame of the portal pile driver, and the control system is used to calculate the movement amount of the moving part according to the weight change monitored by the monitoring system, and move the moving part in a direction perpendicular to the plane of the portal frame according to the movement amount.

[0020] The method for constructing a cast-in-place pile of the present invention is applied to the above-mentioned portal pile driver, and includes the steps of: starting the moving assembly to transport one of the drill pipes on the moving assembly to the material supply position in step S1; starting the lift assembly to make the pickup part grab the drill pipe at the material supply position, and after the moving assembly is far away from the material supply position, rotating the lift assembly to drive the pickup part to switch the drill pipe grabbed by the pickup part from a horizontal state to an upright state and move it below the power head in step S2; connecting the tip of the drill pipe grabbed by the pickup part to the power head, and then making the pickup part release the grabbed drill pipe in step S3; and lowering the power head. the power head is driven to move the drill pipe connected below the power head to the tip of the drill pipe buried at the design pile position of the cast-in-place pile, and then the lower end of the drill pipe connected below the power head is connected to the tip of the buried drill pipe; step S5: continuing to drive the power head to lower the power head, starting the power head, rotating the drill pipe connected below the power head, and causing it to penetrate into the soil body at the design pile position of the cast-in-place pile; step S6: separating the power head from the drill pipe connected below it, and then driving the power head to lift it; and step S7: repeating steps S1 to S6, sequentially connecting the multiple drill pipes on the moving assembly, and causing them to penetrate into the soil body at the design pile position of the cast-in-place pile.

[0021] The portal pile driver provided by the present invention includes a portal frame, a pile frame platform, a moving assembly and a lifting assembly, the portal frame is disposed vertically on one side of the pile frame platform, a power head that can be raised and lowered is attached to the portal frame, the power head is detachably connected to one end of any drill pipe that moves below the portal frame, a material supply position is provided on the pile frame platform at a position on the side of the portal frame, the projection of the central axis of the power head on the pile frame platform is in the extension direction of the material supply position, a moving assembly is provided on one or both sides of the material supply position, and the moving assembly is provided with: A plurality of drill pipes are arranged horizontally, and each drill pipe is all perpendicular to the plane of the portal frame, the moving assembly is used to move in a horizontal plane in a direction parallel to the plane of the portal frame, and to transport the plurality of drill pipes to the material supply position in sequence, the lift assembly includes a pick-up part, which is used to grab the drill pipe at the material supply position, and the lift assembly is used to rotate with respect to the pile frame platform, and during the rotation, to switch the drill pipe grabbed by the pick-up part from a horizontal state to an upright state and move it under the power head. The portal pile driver provided by the present invention is used for constructing cast-in-place piles, and is particularly suitable for constructing long cast-in-place piles, and in order to lower the height of the pile driver, the drill fitted to the portal pile driver is divided into a plurality of drill pipes, one of which is equipped with a drill, and the drill pipe equipped with the drill is regarded as the existing drill pipe, and the remaining drill pipes are the spare drill pipes. Before installing the cast-in-place pile, the existing drill pipe may first be connected below the power head on the portal frame, and multiple spare drill pipes may be placed horizontally on the moving assembly in sequence.The portal frame is erected on one side of the pile frame platform, and the existing drill pipe is connected below the power head mounted thereon, but the moving assembly is further installed on the pile frame platform, and the multiple spare drill pipes on the moving assembly are all horizontally arranged, so that at this time, a large amount of upright drill pipes are not piled up on the portal frame on the pile frame platform, and the center of gravity of the pile driver is not shifted to the portal frame, and at the same time, the multiple spare drill pipes horizontally arranged can play the role of counterweight balance, so that the balance and stability of the portal pile driver can be effectively ensured. In the process of constructing a cast-in-place pile, the spare drill pipe needs to be sequentially connected to the existing drill pipe to form a drill, specifically, the power head is first lowered from the portal frame to start the power head, so that the power head is used to rotate the existing drill pipe and make it penetrate into the soil body at the designed pile position. Then, the power head is separated from the existing drill pipe, and the power head is raised from the portal frame to its original position, ready to be connected to the next spare drill pipe. In the process of driving the power head to move the existing drill pipe, it is also necessary to move the moving assembly horizontally along a direction parallel to a plane of the portal frame on the pile frame platform to transport one spare drill pipe to the material supply position. After the spare drill pipe moves to the material supply position, the pick-up part of the lift assembly is started, and the pick-up part grabs the spare drill pipe at the material supply position. Then, the lift assembly is started, and the lift assembly is rotated relative to the pile frame platform, and since the projection of the central axis of the power head on the pile frame platform is in the extension direction of the material supply position, the spare drill pipe grabbed by the pick-up part can be switched from a horizontal state to an upright state by rotating the lift assembly, and at the same time, the spare drill pipe is placed under the power head after being uprighted.At this time, the power head is connected to the spare drill pipe below it, then the pick-up part is released to return the lift assembly to its original position, and at the same time, the power head is lowered, the spare drill pipe connected below the power head is moved to the tip of the existing drill pipe, the lower end of the spare drill pipe is connected to the tip of the existing drill pipe, and the power head is started to rotate the spare drill pipe and the existing drill pipe simultaneously, so that the spare drill pipe is also drilled into the soil body at the design pile position. By repeating the above process of moving the spare drill pipe, rotating the spare drill pipe, connecting the spare drill pipe to the power head, lowering the power head, connecting the spare drill pipe, and drilling the spare drill pipe into the soil body, a plurality of spare drill pipes can be connected in sequence and drilled downward, and finally, the drill formed by connecting the plurality of drill pipes is submerged into the soil body at the design pile position of the cast-in-place pile, and the drill can meet the design length requirement of the cast-in-place pile and can be used to construct the cast-in-place pile. In the process of sequentially connecting multiple spare drill pipes, the spare drill pipes arranged horizontally on the pile frame platform, which do not move to the material supply position, can play the role of counterweight to continuously ensure the balance and stability of the portal pile driver, and at the same time, since each spare drill pipe is drilled downward into the soil body after connection, the weight on the portal frame does not continue to increase as the connection work proceeds. Even if the spare drill pipes are not arranged horizontally on the pile frame platform in the later stage of the connection work, the center of gravity of the portal pile driver will not shift to the gantry at this time, and the stability of the portal pile driver can be ensured. Effect of the Invention

[0022] Compared with the prior art, the portal pile driver provided by the present invention can send the drill pipes horizontally placed at different working positions to the same position (below the power head) in the portal frame in a single stroke path of the lift assembly by horizontally placing the drill pipes on the moving assembly that moves in an orderly manner, and by sequentially picking up and lifting each drill pipe from point to point by the lift assembly, so that the drill pipe transportation, connection and drilling process can be performed in an orderly manner. At the same time, the portal pile driver can allocate the weight of the pile driver to ensure the stability of the portal pile driver by horizontally placing the drill pipes on the moving assembly. In the connection process, the process of drilling immediately after connection and the horizontally placed drill pipes that have not yet been connected can be used to prevent the center of gravity of the portal pile driver from shifting too much to the portal frame, and the stability of the portal pile driver can be continuously ensured in use.

[0023] The method for constructing a cast-in-place pile provided by the present invention is an application of the portal pile driver, and includes the steps of: starting the moving assembly to transport one of the drill pipes on the moving assembly to the material supply position in step S1; starting the lift assembly to make the pickup part grab the drill pipe at the material supply position, and after the moving assembly is far away from the material supply position, rotating the lift assembly to drive the drill pipe grabbed by the pickup part to switch from a horizontal state to an upright state and move it below the power head in step S2; connecting the tip of the drill pipe grabbed by the pickup part to the power head, and then making the pickup part release the grabbed drill pipe in step S3; and lowering the power head in step S4. the power head is driven downward to move the drill pipe connected below the power head to the tip of the drill pipe buried at the design pile position of the cast-in-place pile, and then the lower end of the drill pipe connected below the power head is connected to the tip of the buried drill pipe; step S5: continuing to drive the power head downward to start the power head, rotating the drill pipe connected below the power head to cause it to penetrate into the soil body at the design pile position of the cast-in-place pile; step S6: separating the power head from the drill pipe connected below it, and then driving the power head to lift it; and step S7: repeating steps S1 to S6 to sequentially connect the multiple drill pipes on the moving assembly to cause them to penetrate into the soil body at the design pile position of the cast-in-place pile.

[0024] The method for constructing cast-in-place piles provided by the present invention applies the above-mentioned portal pile driver and can achieve the same beneficial effects as those of the above-mentioned portal pile driver. [Brief description of the drawings]

[0025] In order to more clearly describe the embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings that need to be used in the description of the embodiments of the present invention or the prior art, and obviously, the drawings in the following description are some embodiments of the present invention, and those skilled in the art can further obtain other drawings based on these drawings without creative efforts.

[0026] [Figure 1] FIG. 2 is a schematic structural diagram of a portal pile driver provided according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a structural schematic diagram of a portal pile driver provided according to an embodiment of the present invention and one spare drill pipe thereof when the drill pipe moves to a material supply position. [Diagram 3] FIG. 3 is a top view of the pile frame platform and the spare drill pipes in FIG. 2. [Figure 4] FIG. 3 is a top view of the pile frame platform and the spare drill pipes after the moving assembly in FIG. 2 has returned to its original position. [Diagram 5] FIG. 2 is a schematic structural diagram of a portal pile driver when the lift assembly provided according to an embodiment of the present invention rotates; [Figure 6] FIG. 2 is a side view of a portal pile driver when the lift assembly provided in accordance with an embodiment of the present invention is rotated; [Figure 7] FIG. 2 is a side view of a portal pile driver when the lift assembly provided in accordance with an embodiment of the present invention is rotated to an upright position. [Figure 8] FIG. 2 is a schematic structural diagram of a portal pile driver when a spare drill pipe provided by an embodiment of the present invention is upright under a power head. [Figure 9] FIG. 2 is a schematic structural diagram of the portal pile driver when the spare drill pipe provided by the embodiment of the present invention is connected below the power head. [Figure 10] FIG. 2 is a schematic structural diagram of the portal pile driver when the power head provided by the embodiment of the present invention drives the preliminary drill pipe to descend; [Figure 11]1 is a cross-sectional view of a movement assembly, a lift assembly and a spare drill pipe provided in accordance with an embodiment of the present invention; [Figure 12] FIG. 12 is a top view of the movement assembly, lift assembly and spare drill pipe in FIG. 11. [Figure 13] FIG. 2 is a cross-sectional view of a moving assembly, a lift assembly and spare drill pipes when one of the spare drill pipes provided according to an embodiment of the present invention moves to a material supply position. [Figure 14] FIG. 14 is a top view of the movement assembly, lift assembly and spare drill pipe in FIG. 13. [Figure 15] 4 is another cross-sectional view of a movement assembly, a lift assembly and a spare drill pipe provided in accordance with an embodiment of the present invention. FIG. [Figure 16] FIG. 16 is a top view of the movement assembly, lift assembly and spare drill pipe in FIG. 15. [Figure 17] FIG. 2 is another cross-sectional view of a movement assembly, a lift assembly and a spare drill pipe provided in accordance with an embodiment of the present invention. [Figure 18] FIG. 18 is a top view of the movement assembly, lift assembly and spare drill pipe in FIG. 17. [Figure 19] FIG. 2 is a cross-sectional view of yet another movement assembly, lift assembly and spare drill pipe provided in accordance with an embodiment of the present invention. [Figure 20] FIG. 20 is a top view of the movement assembly, lift assembly and spare drill pipe in FIG. 19. [Figure 21] FIG. 2 is a top view of a movement assembly, a lift assembly and a pile frame platform provided in accordance with an embodiment of the present invention. [Figure 22] FIG. 2 is another schematic structural diagram of a portal pile driver provided according to an embodiment of the present invention. [Diagram 23] FIG. 23 is a partial side view of the portal pile driver in FIG. 22. [Figure 24]23 is a partial side view of the portal pile drivers in FIG. 22 when a spare drill pipe of one of the portal pile drivers moves to a material supply position. FIG. [Diagram 25] 23 is a partial side view of the gate pile driver in FIG. 22 when the slide mechanism in the material supply position is lowered. FIG. [Figure 26] FIG. 2 is a schematic structural diagram of a portal pile driver provided according to an embodiment of the present invention; [Figure 27] FIG. 27 is a schematic structural view of the portal pile driver of FIG. 26 when the lift assembly in the portal pile driver is rotated to an upright position. [Figure 28] FIG. 27 is a schematic structural diagram of the gate pile driver when the drill pipe in the gate pile driver of FIG. 26 is drilling downward. [Figure 29] FIG. 27 is a schematic structural diagram of the gate pile driver of FIG. 26 after the drill pipe has been drilled downward. [Diagram 30] FIG. 27 is a schematic structural view of the portal pile driver of FIG. 26 after the preliminary drill pipe in the portal pile driver has been drilled down and when the lift assembly has rotated in the reverse direction to a horizontal position. [Diagram 31] FIG. 2 is a schematic structural diagram of a portal pile driver including a turntable mechanism provided according to an embodiment of the present invention; [Diagram 32] FIG. 32 is a schematic structural view of the portal pile driver of FIG. 31 when the lift assembly in the portal pile driver rotates to a horizontal position. [Diagram 33] FIG. 32 is a schematic structural diagram of the portal pile driver of FIG. 31 when the lift assembly in the portal pile driver drives one of the spare drill pipes to rotate to an upright position. [Diagram 34] FIG. 32 is a schematic structural diagram of the gate pile driver of FIG. 31 after the turntable mechanism drives the mechanical arm to rotate about its axis. [Diagram 35] 1 is a flowchart of a cast-in-place pile construction method provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] In order to make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings of the embodiments of the present invention, and the described embodiments are only some embodiments of the present invention, obviously not all embodiments. Usually, the assemblies of the embodiments of the present invention described and shown in the drawings can be arranged and designed in various different configurations. The detailed description of the embodiments of the present invention provided in the following drawings is not intended to limit the scope of the claimed invention, but only shows the embodiments selected by the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

[0028] Working Example: As shown in Figs. 1 to 10, the portal pile driver provided by this embodiment includes a portal frame 1, a pile frame platform 2, a moving assembly 3, and a lift assembly 4. The portal frame 1 is vertically disposed on one side of the pile frame platform 2, and a power head 10 that can be raised and lowered is attached to the portal frame 1. The power head 10 can be detachably connected to one end of any drill pipe moving below it. A material supply position is installed at a position on the side of the portal frame 1 of the pile frame platform 2, and the projection of the central axis of the power head 10 on the pile frame platform 2 is in the extension direction of the material supply position. A moving assembly 3 is installed on one or both sides of the material supply position, and multiple drill pipes are horizontally arranged on the moving assembly 3, and each drill pipe is all perpendicular to the plane on which the portal frame 1 is located. The moving assembly 3 is used to move in a direction parallel to the plane on which the portal frame 1 is located in the horizontal plane and transport the multiple drill pipes to the material supply position in sequence. The lift assembly 4 includes a pick-up part 40, and the pick-up part 40 is used to grab the drill pipe at the material supply position. The lift assembly 4 rotates relative to the pile frame platform 2 and, during rotation, is used to switch the drill pipe grasped by the pick-up part 40 from a horizontal position to an upright position and move it below the power head 10.

[0029] The portal pile driver provided in this embodiment is used for constructing cast-in-place piles, and is especially suitable for constructing long cast-in-place piles. In order to reduce the height of the pile driver, the drill fitted to the portal pile driver is divided into multiple drill pipes, one of which is equipped with a drill, the drill pipe equipped with the drill is regarded as the existing drill pipe 5, and the remaining drill pipes are the spare drill pipes 6. Before constructing the cast-in-place piles, a drill that meets the drilling depth according to the design length requirement of the cast-in-place pile is first selected, and then the existing drill pipe 5 equipped with the drill bit in the drill is connected under the power head 10 on the portal frame 1, and multiple spare drill pipes 6 in the drill can be arranged on the moving assembly 3 in parallel and horizontally. The portal frame 1 stands upright on one side of the pile frame platform 2, and the existing drill pipe 5 is connected below the power head 10 mounted on it. However, the movable assembly 3 is further installed on the pile frame platform 2, and the multiple spare drill pipes 6 on the movable assembly 3 are all arranged horizontally. At this time, a large amount of upright drill pipes is not piled up on the portal frame 1 on the pile frame platform 2, and the center of gravity of the pile driver is not shifted to the portal frame 1. At the same time, the multiple spare drill pipes 6 arranged horizontally can play the role of counterweight balance, effectively ensuring the balance and stability of the portal pile driver.

[0030] In the process of constructing a cast-in-place pile, in order to form a drill that can meet the design length requirements of the cast-in-place pile, it is necessary to sequentially connect the existing drill pipe 5 and a number of spare drill pipes 6. Specifically, the portal pile driver is first moved to the construction area of ​​the cast-in-place pile, and the power head 10 is placed above the design pile position of the cast-in-place pile. Then, as shown in Figures 1 and 2, the power head 10 is lowered on the portal frame 1 to start the power head 10, thereby using the power head 10 to rotate the existing drill pipe 5 and drive it to penetrate into the soil body at the design pile position. Then, as shown in Figures 5 and 6, the power head 10 is separated from the existing drill pipe 5, and the power head 10 is raised to its original position in the portal frame 1, ready to be connected to the next spare drill pipe 6. In the process of driving the power head 10 to move the existing drill pipe 5, it is also necessary to horizontally move the moving assembly 3 along a direction parallel to the plane of the portal frame 1 on the pile frame platform 2 to transport one spare drill pipe 6 to the material supply position, as shown in Figures 2 and 3. After the spare drill pipe 6 moves to the material supply position, the pick-up part 40 of the lift assembly 4 is started, and the pick-up part 40 grabs the spare drill pipe 6 at the material supply position. Then, in the process of lifting the power head 10 to its original position, as shown in Figures 6 and 7, the lift assembly 4 is started, and the lift assembly 4 is rotated relative to the pile frame platform 2. Since the projection of the central axis of the power head 10 on the pile frame platform 2 is in the extension direction of the material supply position, by rotating the lift assembly 4, the spare drill pipe 6 grabbed by the pick-up part 40 can be switched from a horizontal state to an upright state, and at the same time, the spare drill pipe 6 is placed under the power head 10 after being upright, as shown in Figures 7 and 8. When the spare drill pipe 6 is in the upright state, the power head 10 also rises to its original position, and at this time, as shown in Figures 8 and 9, the power head 10 is lowered and connected to the spare drill pipe 6 below it.After the power head 10 and the spare drill pipe 6 below it are connected, the pickup part 40 is released to return the lift assembly 4 to its original position, and at the same time, as shown in Figure 10, the power head 10 is lowered, the spare drill pipe 6 connected below the power head 10 is moved to the tip of the existing drill pipe 5, the lower end of the spare drill pipe 6 is connected to the tip of the existing drill pipe 5, the power head 10 is started to drive the spare drill pipe 6 and the existing drill pipe 5 to rotate simultaneously, and the spare drill pipe 6 is also excavated into the soil body at the design pile position.

[0031] By repeating the above process of moving the spare drill pipe 6, rotating the spare drill pipe 6, connecting the spare drill pipe 6 to the power head 10, lowering the power head 10, connecting the spare drill pipe 6, and drilling the spare drill pipe 6 into the soil body, multiple spare drill pipes 6 can be connected in sequence and drilled downward, and finally the drill formed by connecting multiple drill pipes can be penetrated into the soil body at the design pile position of the cast-in-place pile, and the drill can meet the design length requirements of the cast-in-place pile and can be used to construct the cast-in-place pile.

[0032] Here, after the pickup part 40 grabs the spare drill pipe 6 at the material supply position, in order to prevent the lift assembly 4 and the moving assembly 3 from interfering with each other during the subsequent movement process of the spare drill pipe 6, as shown in Figures 4 and 5, the pickup part 40 first moves the moving assembly 3 in the reverse direction to its original position, and then activates the lift assembly 4 to rotate the lift assembly 4 relative to the pile frame platform 2.

[0033] In the process of sequentially connecting a plurality of spare drill pipes 6, the spare drill pipes 6 arranged horizontally on the pile frame platform 2, which do not move to the material supply position, can play the role of counterweight to continuously ensure the balance and stability of the portal pile driver, and at the same time, since each spare drill pipe 6 is drilled downward into the soil body after connection, the weight on the portal frame 1 does not continue to increase as the connection work proceeds. Even if the spare drill pipes 6 are not arranged horizontally on the pile frame platform 2 in the later stage of the connection work, the center of gravity of the portal pile driver will not shift to the gantry 1 at this time, and the stability of the portal pile driver can be ensured.

[0034] Whether it is the connection process between the existing drill pipe 5 and the power head 10, the connection process between the spare drill pipe 6 and the power head 10, or the connection process between two adjacent drill pipes, they can all use manual connection or automatic connection methods.

[0035] Among them, the automatic connection method can be realized by using a connector assembly with an elastic latch. Specifically, the connector assembly includes a male connector and a female connector, one of which is provided with an elastic latch and the other is provided with a slot. When the male connector is butted with the female connector, the elastic latch can be automatically inserted into the slot, and the elastic latch can be released from the slot after being subjected to pressure under the action of an external force. At this time, the male connector and the female connector are separated from each other. In addition, the power head 10 and the lower end of each spare drill pipe 6 may all be provided with a female connector, and the tip of each drill pipe of the female connector may use a male connector. When the spare drill pipe 6 is horizontally arranged on the moving assembly 3, the male connector of the spare drill pipe 6 perpendicular to the plane of the portal frame 1 may be provided near the portal frame 1, and the female connector of the spare drill pipe 6 may be provided far away from the portal frame 1.

[0036] In order to improve the connection accuracy between the power head 10 and the spare drill pipe 6, a positioning part 100 may be installed on the power head 10. When the spare drill pipe 6 stands upright below the power head 10, the positioning part 100 is used to abut against the circumferential side wall of the spare drill pipe 6 to restrict the spare drill pipe 6, thereby stably positioning the spare drill pipe 6 below the power head 10.

[0037] Compared with the prior art, the portal pile driver provided by this embodiment can send the drill pipes horizontally placed at different working positions to the same position (below the power head 10) in the portal frame 1 in a single stroke path of the lift assembly 4 by horizontally placing the drill pipes on the moving assembly 3 that moves in an orderly manner, and by sequentially picking up and lifting each drill pipe from point to point by the lift assembly 4, so that the drill pipe transportation, connection and drilling processes can be performed in an orderly manner. At the same time, the portal pile driver can allocate the weight of the pile driver to ensure the stability of the portal pile driver by horizontally placing the drill pipes on the moving assembly 3. In the connection process, the center of gravity of the portal pile driver can be prevented from shifting too much to the portal frame 1 by utilizing the process of drilling immediately after connection and the horizontally placed drill pipes that have not yet been connected, and the stability of the portal pile driver can be continuously ensured in use.

[0038] It can be seen that the portal pile driver provided in this embodiment can realize the orderly placement of the spare drill pipes 6, so that the spare drill pipes 6 can be safely, smoothly and reliably positioned in the portal pile driver, and will not cause the portal pile driver to tip over due to the shift in the center of gravity. At the same time, the moving assembly 3 can move in an orderly manner along a simple path on the pile frame platform 2, so that all the spare drill pipes 6 can be automatically displaced to the material supply position and aligned with the pick-up parts 40 of the lift assembly 4. Then, the rotational action of the lift assembly 4 can switch the spare drill pipes 6 from a horizontal state to an upright state and position them below the power head 10, so that the portal pile driver provided in this embodiment can further complete the drill pipe removal, transportation and connection operations with three simple continuous actions of placing the drill pipes horizontally in an orderly manner, moving the drill pipes horizontally and rotating the drill pipes, thus overcoming the problems of the low stability and unsmooth connection of the existing pile driver.

[0039] In this embodiment, a vertical force applying mechanism for driving the power head 10 to rise or fall may be attached to the portal frame 1. Here, the vertical force applying mechanism may use a telescopic drive device such as an air cylinder or an oil cylinder. The structure of the vertical force applying mechanism is not limited, and any device capable of driving the power head 10 to rise and fall may be used, for example, the vertical force applying mechanism may further use a chain device or a hoisting device.

[0040] As shown in Fig. 1, the portal frame 1 of the portal pile driver provided in this embodiment uses a portal structure, and the portal frame 1 is composed of two parallel upright columns and a cross beam connected vertically between the two upright columns. The plane on which the portal frame 1 is located is the plane on which the two upright columns and the cross beam are located.

[0041] Furthermore, each upright of the portal frame 1 can be formed by a sliding connection between the fixed rod 11 and the lifting rod 12. The power head 10 is fixedly connected to the lifting rod 12. A vertical force applying mechanism can be attached to the portal frame 1, and the output end of the vertical force applying mechanism is connected to the power head 10, and the vertical force applying mechanism is used to drive the power head 10 to rise or fall, and at the same time, the power head 10 can drive the lifting rod 12 to slide vertically on the fixed rod 11. At this time, the fixed rod 11 and the lifting rod 12 form a slide rail structure, thereby effectively improving the lifting stability of the power head 10 in the portal frame 1.

[0042] In this embodiment, a traveling assembly 7 may be further installed on the bottom of the pile frame platform 2 to facilitate the movement of the portal pile driver. In addition, in this embodiment, the traveling assembly 7 is preferably a crawler-type traveling mechanism or a walking-type traveling mechanism. In order to improve the supporting strength of the pile frame platform 2 in the portal pile driver, in this embodiment, preferably, the pile frame platform 2 includes a shell and a supporting structure installed in the shell, and the supporting structure is formed by connecting multiple stress rod members.

[0043] 1, 11, 12 and 21, the moving assembly 3 includes a plurality of slide mechanisms 30, which are spaced apart in a direction perpendicular to a plane of the portal frame 1. The slide mechanisms 30 are used to support and move a plurality of drill pipes, and the pickup parts 40 at the material supply position and the slide mechanisms 30 are alternately arranged in a direction perpendicular to a plane of the portal frame 1.

[0044] As shown in Figures 11, 12, 13 and 14, the slide mechanism 30 can move in a direction parallel to the plane of the portal frame 1 on the pile frame platform 2 under the driving force of an external force, and at this time, by adjusting the movement stroke of the slide mechanism 30, the slide mechanism 30 can accurately transport the spare drill pipe 6 to be connected thereto to the material supply position.

[0045] When there are multiple slide mechanisms 30 and each slide mechanism 30 supports multiple spare drill pipes 6, the movement stroke of the slide mechanisms 30 can be adjusted to accurately move each spare drill pipe 6 to the material supply position.

[0046] The pickup parts 40 and the multiple slide mechanisms 30 at the material supply position are arranged alternately in a direction perpendicular to the plane of the gantry frame 1, effectively preventing the pickup parts 40 and the slide mechanisms 30 from interfering with each other and making it difficult for the spare drill pipe 6 to move to the designated position.

[0047] In addition, in order to prevent mutual interference between the spare drill pipe 6 on the slide mechanism 30 moving to the material supply position and the pick-up part 40, as shown in Fig. 11, the top of the pick-up part 40 in the open state is lower than the spare drill pipe 6. As shown in Fig. 13, after the slide mechanism 30 drives the drill pipe 6 to move to the material supply position, the pick-up part 40 closes again to grab the spare drill pipe 6 above it.

[0048] As shown in Figures 13 and 15, the slide mechanism 30 has a telescopic structure, and is used to drive the drill pipe supported by it to move up and down during the telescopic process. Here, the slide mechanism 30 is in an extended state during the process of supporting and transporting the spare drill pipe 6, and after the slide mechanism 30 transports the spare drill pipe 6 to the material supply position and the pick-up part 40 grabs the spare drill pipe 6, as shown in Figures 15 and 16, the slide mechanism 30 can be shortened and lowered, at this time, a gap is generated between the slide mechanism 30 and the spare drill pipe 6 grabbed by the pick-up part 40, and the slide mechanism 30 is easy to slide in the reverse direction and return to its original position. It can be seen that when the slide mechanism 30 has a telescopic structure, the slide mechanism 30 is easy to return to its original position after moving the spare drill pipe 6 to a predetermined position.

[0049] As shown in Figures 17 and 18, when the slide mechanism 30 moves in the reverse direction to return to the original position, the slide mechanism 30 can still be held in the contracted state. After the slide mechanism 30 moves to the original position, the slide mechanism 30 needs to be further extended to carry the next spare drill pipe 6, as shown in Figures 19 and 20.

[0050] As shown in Figures 1 and 21, a plurality of guide rails 20 are installed on the pile frame platform 2, the plurality of guide rails 20 are spaced apart in a direction perpendicular to the plane of the portal frame 1, and each guide rail 20 extends in a direction parallel to the plane of the portal frame 1. A plurality of slide mechanisms 30 are slidably connected to the plurality of guide rails 20 in one-to-one correspondence.

[0051] The guide rail 20 can not only limit the movement direction of the slide mechanism 30, but also reduce the friction between the slide mechanism 30 and the pile frame platform 2, thereby improving the smooth movement of the slide mechanism 30.

[0052] Furthermore, the number of moving assemblies 3 is an even number, and the even number of moving assemblies 3 are divided into two sets, and the two sets of moving assemblies 3 are symmetrically arranged on both sides of the material supply position. When the number of moving assemblies 3 is an even number and arranged symmetrically, not only can the moving assemblies 3 be arranged more orderly and uniformly, but the arrangement of the spare drill pipes 6 can also be made more orderly and uniform, thereby effectively improving the counterweight balance of the portal pile driver.

[0053] As shown in FIG. 1, each slide mechanism 30 has a first locking position 300 and a second locking position 301 spaced apart, and the first locking positions 300 of the multiple slide mechanisms 30 are arranged in the same straight line to support the same drill pipe, and the second locking positions 301 of the multiple slide mechanisms 30 are arranged in the same straight line to support the same drill pipe.

[0054] A first locking position 300 on the multiple slide mechanisms 30 is used to support one spare drill pipe 6, and a second locking position 301 on the multiple slide mechanisms 30 is used to support another spare drill pipe 6, and at this time, each moving assembly 3 can support two drill pipes.

[0055] 1 , the slide mechanism 30 may use a slide block with a pulley 302 installed at the bottom, the pulley 302 is slidingly connected to the guide rail 20, and the slide block is used to support the spare drill pipe 6. In addition, the first locking position 300 and the second locking position 301 may all be locking grooves installed at the top of the slide mechanism 30.

[0056] At this time, when the sliding mechanism 30 has a telescopic structure, the sliding block may be a cover body with an opening at the bottom, and the sliding mechanism 30 further includes a bottom plate and a scissor mechanism 303, the bottom plate is installed at the bottom of the sliding block, the pulley 302 is attached to the bottom surface of the bottom plate, and the scissor mechanism 303 is connected between the top surface of the bottom plate and the inner wall of the sliding block, and the scissor mechanism 303 is formed by hinge connection by a plurality of connecting rods, and can be telescopically extended or retracted to raise or lower the hollow sliding block relative to the bottom plate.

[0057] Furthermore, when the first locking position 300 and the second locking position 301 are all locking grooves, the first locking position 300 and the second locking position 301 can be at the same height, and at this time, the first locking position 300 and the second locking position 301 can be arranged at intervals on the top of the sliding mechanism 30 along the movement direction of the sliding mechanism 30.

[0058] Alternatively, as shown in FIG. 22, the slide mechanism 30 may be composed of two slide brackets 304 installed adjacent to each other, in which case each guide rail 20 may include two branch rails installed in parallel, and the two slide brackets 304 are slidably connected to the two branch rails in one-to-one correspondence.

[0059] 22 , a hole may be provided at the bottom of the sliding bracket 304, and the sliding bracket 304 may be slidably connected to the branch rail of the guide rail 20 through the hole. The first locking position 300 and the second locking position 301 may both be manufactured on a support plate, in which the first locking position 300 is fixedly connected to one side of the sliding bracket 304 of one of the sliding mechanisms 30, and the second locking position 301 is fixedly connected to one side of the sliding bracket 304 of the other of the sliding mechanisms 30.

[0060] In order to prevent mutual interference between the first locking position 300 and the second locking position 301, as shown in Fig. 22, the vertical distance between the first locking position 300 and the pile frame platform 2 is not equal to the vertical distance between the second locking position 301 and the pile frame platform 2. In addition, the vertical distance between the first locking position 300 and the pile frame platform 2 may be greater than the vertical distance between the second locking position 301 and the pile frame platform 2, and at this time, the ground height of the spare drill pipe 6 supported by the first locking position 300 of the plurality of slide mechanisms 30 is greater than the ground height of the spare drill pipe 6 supported by the second locking position 301 of the plurality of slide mechanisms 30.

[0061] When the first locking position 300 and the second locking position 301 all use a support plate, the slide brackets 304 of the multiple slide mechanisms 30 in the moving assembly 3 may be moved in succession in a batch. Specifically, as shown in Fig. 23 and Fig. 24, first, an external force is used to propel only the slide brackets 304 installed in the first locking position 300 on the slide mechanism 30 to move in a direction parallel to the plane of the portal frame 1 until the spare drill pipe 6 on the first locking position 300 is moved to the material supply position. Then, the pick-up part 40 is started to grab the spare drill pipe 6 at the material supply position. Then, all the slide brackets 304 installed in the first locking position 300 are moved to their original positions.

[0062] After all the slide brackets 304 with the first locking positions 300 installed are moved to their original positions, the spare drill pipe 6 on the second locking positions 301 of the slide brackets 304 can be moved to the material supply position. Since the multiple slide mechanisms 30 in the moving assembly 3 are spaced apart in a direction perpendicular to the plane of the portal frame 1, when the spare drill pipe 6 is no longer supported by the first locking positions 300 of the slide brackets 304, the moving process of the slide brackets 304 with the second locking positions 301 installed is not hindered by the spare drill pipe 6 on the first locking positions 300. At this time, an external force is used to propel only the slide brackets 304 with the second locking positions 301 installed in the slide mechanisms 30 to move in a direction parallel to the plane of the portal frame 1, so that the spare drill pipe 6 on the second locking positions 301 can be moved to the material supply position.

[0063] In addition, when the first locking position 300 and the second locking position 301 are both supported by a support plate and the sliding mechanism 30 is of a telescopic structure, the sliding bracket 304 can be an extendable bracket. Specifically, the sliding bracket 304 includes a horizontal bar with a hole and an upright bar connected vertically to the horizontal bar, and the sliding bar is slidably connected to the upright bar. The first locking position 300 or the second locking position 301 is installed on one side of the sliding bar, and the sliding bracket 304 can be extended or retracted by sliding the sliding bar on the upright bar, so that the first locking position 300 or the second locking position 301 can be raised or lowered.

[0064] As shown in Figures 24 and 25, the slide bracket 304 with the first locking position 300 installed can transport the spare drill pipe 6 supported by it to the material supply position and the pickup part 40 can drive the slide bar to slide downward on the upright bar after grabbing the spare drill pipe 6. This causes the first locking position 300 to descend, creating a gap between the first locking position 300 and the spare drill pipe 6. This makes it easier to move the slide bracket 304 in the reverse direction to return it to its original position.

[0065] In this embodiment, a moving drive mechanism can be further installed on the pile frame platform 2. The moving drive mechanism is used to apply an external force to the moving assembly 3 so as to propel the moving assembly 3 on the pile frame platform 2. In addition, the moving drive mechanism may use a telescopic drive device such as an air cylinder, an oil cylinder, etc., or may use a conveying device composed of a motor and a transmission chain.

[0066] The sliding mechanism 30 in the moving assembly 3 provided in this embodiment is not limited to providing only the first locking position 300 and the second locking position 301, but can add a plurality of locking positions such as a third locking position, a fourth locking position, etc. according to actual needs. Furthermore, the structural type of the sliding mechanism 30 is not limited to the above two types, and any type can be adopted as long as it can transport the spare drill pipe 6 to the material supply position in an orderly manner through a simple route.

[0067] As shown in Figures 5 and 6, the lift assembly 4 includes a mechanical arm 41 and a lift-up drive mechanism, the pick-up part 40 is a mechanical chuck, the mechanical arm 41 includes a hinged end and an unconnected end, the hinged end of the mechanical arm 41 is hingedly connected to the pile frame platform 2, the unconnected end of the mechanical arm 41 is hanging, the mechanical chuck is attached to the mechanical arm 41, the output end of the lift-up drive mechanism is connected to the mechanical arm 41, and the lift-up drive mechanism is used to drive the mechanical arm 41 to rotate relative to the pile frame platform 2, so as to switch the mechanical arm 41 between a horizontal state and an upright state.

[0068] Here, the lift-up driving mechanism can use an expandable driving device such as an air cylinder or an oil cylinder, etc. The opening and closing of the mechanical chuck can be realized by an electric or pneumatic method, and accordingly, the mechanical chuck can use an electric chuck or a pneumatic chuck.

[0069] The mechanical arm 41 in the lift assembly 4 provided by this embodiment is used to switch between horizontal and upright states under the driving of the lift-up driving mechanism, and to switch the spare drill pipe 6 between horizontal and upright states. When the spare drill pipe 6 is rotated to the upright state, it can be accurately positioned below the power head 10, so that the mechanical arm 41 can only rotate within the range of 0 to 90 degrees.

[0070] In order to improve the flexibility of use of the mechanical arm 41, in this embodiment, preferably, the length of the mechanical arm 41 is smaller than the length of the spare drill pipe 6, and at this time, the pick-up part 40 can be attached to the unconnected end of the mechanical arm 41.

[0071] As shown in Fig. 5 and Fig. 6, the hinge connection end of the mechanical arm 41 is located between the gate frame 1 and the material supply position, and the mechanical chuck is attached to the arm surface of the mechanical arm 41 facing away from the pile frame platform 2, or as shown in Fig. 31 to Fig. 34, the mechanical chuck is attached to the arm surface of the mechanical arm 41 facing the pile frame platform 2. A turntable mechanism 21 is attached to the pile frame platform 2, and the hinge connection end of the mechanical arm 41 is hingedly connected to the turntable mechanism 21. The turntable mechanism 21 is used to drive the mechanical arm 41 and rotate it about its central axis as the rotation axis.

[0072] When the hinge connection end of the mechanical arm 41 is between the portal frame 1 and the material supply position, in order to accurately position the spare drill pipe 6 under the power head 10 when the spare drill pipe 6 is rotated to the upright position, the spare drill pipe 6 must be located on one side of the mechanical arm 41 close to the portal frame 1 after the mechanical chuck on the mechanical arm 41 has grasped it. Therefore, the mechanical chuck is directly attached to the arm surface of the mechanical arm 41 facing away from the pile frame platform 2, or the mechanical chuck is attached to the arm surface of the mechanical arm 41 facing the pile frame platform 2 and a turntable mechanism 21 is added to rotate the mechanical arm 41 after it is upright, thereby driving the spare drill pipe 6 to change its direction.

[0073] Specifically, for the method of directly attaching the mechanical chuck to the arm surface of the mechanical arm 41 facing away from the pile frame platform 2, as shown in Figures 3, 5 and 6, at the material supply position, the mechanical chuck grasps the spare drill pipe 6 from bottom to top, and after grasping, the spare drill pipe 6 is located above the mechanical arm 41.

[0074] Regarding the manner of attaching the mechanical chuck to the arm surface of the mechanical arm 41 facing the pile frame platform 2, as shown in Fig. 31 and Fig. 32, in the material supply position, the mechanical chuck grasps the spare drill pipe 6 from above and below, and the spare drill pipe 6 after grasping is under the mechanical arm 41. After the mechanical arm 41 drives the spare drill pipe 6 to rotate to an upright state, as shown in Fig. 33, the spare drill pipe 6 is located on one side of the mechanical arm 41 facing away from the portal frame 1. At this time, in order to arrange the spare drill pipe 6 on the one side of the mechanical arm 41 facing the portal frame 1 and below the power head 10, the turntable mechanism 21 is used to drive the mechanical arm 41 to rotate 180 degrees, and the spare drill pipe 6 is moved to the bottom of the power head 10.

[0075] Here, the turntable mechanism 21 can use a rotation drive device including a motor.

[0076] In this embodiment, the position of the mechanical arm 41 is further adjusted so that after the mechanical chuck grabs the spare drill pipe 6, the spare drill pipe 6 can be located on one side of the mechanical arm 41 close to the portal frame 1. Specifically, as shown in Fig. 26 to Fig. 30, the extension frame 22 is connected to one side of the pile frame platform 2 where the portal frame 1 is installed, and the hinge connection end of the mechanical arm 41 is hingedly connected to the extension frame 22, and the mechanical arm 41 can be upright on one side of the portal frame 1 opposite to the material supply position after passing through the portal frame 1 in the process of rotating relative to the pile frame platform 2. The mechanical chuck is attached to the arm surface of the mechanical arm 41 facing the pile frame platform 2.

[0077] As shown in Fig. 26, in the material supply position, the mechanical chuck grips the spare drill pipe 6 from top to bottom, and the spare drill pipe 6 after gripping is below the mechanical arm 41. When the mechanical arm 41 is driven to rotate the spare drill pipe 6 to an upright state, since the hinge connection end of the mechanical arm 41 is hinge-connected to the extension frame 22, the mechanical arm 41 passes the spare drill pipe 6 through the portal frame 1, and as shown in Fig. 27, the spare drill pipe 6 is located on one side of the mechanical arm 41 facing the portal frame 1 and below the power head 10.

[0078] In addition, in order to prevent the mechanical arms 41 from interfering with the process of connecting the spare drill pipe 6, all the mechanical arms 41 must be kept upright during the process of connecting the drill pipe and lifting the power head 10 after connecting the drill pipe, as shown in Figures 28 and 29. When it is necessary to pick up the next spare drill pipe 6, the mechanical arms 41 are rotated to a horizontal position, as shown in Figure 30.

[0079] In order to prevent the extension frame 22 from interfering with the drill pipe connection and the downward drilling process, it is necessary to install a through hole in the extension frame 22 at a position opposite the power head 10, through which the power head 10 and the drill pipe can pass.

[0080] In order to further improve the balance of the portal pile driver, in this embodiment, the portal pile driver preferably further includes a counterweight structure, which is mounted on the opposite side of the pile frame platform 2 from the portal frame 1, and is used to prevent the center of gravity of the portal pile driver from shifting to one side of the portal frame 1. In this embodiment, the counterweight structure is preferably a self-adjusting counterweight assembly 8, and the portal pile driver further includes a monitoring system and a control system 9, where the self-adjusting counterweight assembly 8 is mounted on the other side of the pile frame platform 2, which is far away from the portal frame 1, and the self-adjusting counterweight assembly 8 includes a moving part that can move in a direction perpendicular to the plane of the portal frame 1. The self-adjusting counterweight assembly 8 and the monitoring system are all connected to the control system 9, where the monitoring system is used to monitor the weight change on the portal frame 1 of the portal pile driver, and the control system 9 is used to calculate the movement amount of the moving part according to the weight change monitored by the monitoring system, and drive the moving part to move in a direction perpendicular to the plane of the portal frame 1 according to the movement amount.

[0081] The self-adjusting counterweight assembly 8 can use a telescopic structure, in which the moving part is the telescopic end of the self-adjusting counterweight assembly 8, the monitoring system is used to monitor the weight change in the portal frame 1 of the portal pile driver, and the control system 9 can control the telescopic amount of the self-adjusting counterweight assembly 8 according to the monitoring result of the monitoring system. Thus, the self-adjusting counterweight assembly 8 can automatically extend or shorten according to the weight change in the portal frame 1 to adjust the moment of the pile frame platform 2 on the side away from the portal frame 1, change the center of gravity position of the portal pile driver, and maintain the balance of the portal pile driver.

[0082] Furthermore, the self-adjusting counterweight assembly 8 can use an oil cylinder. In practical application, the self-adjusting counterweight assembly 8 can also use a slide block slidably connected to the pile frame platform 2. The monitoring system can be composed of a weight sensor, and the control system 9 can use a programmable logic controller or a one-chip microcomputer. Here, the control system 9 can be further connected to the moving assembly 3, and the control system 9 can control the moving assembly 3 to move along a predetermined path, and there is no need to install a cab on the portal pile driver.

[0083] As described above, the portal pile driver provided in this embodiment arranges the spare drill pipes 6 in parallel with the moving assembly 3, and moves the spare drill pipes 6 laterally in an orderly manner to transport a plurality of spare drill pipes 6 to the material supply position in succession, and then, through the rotation process of the lift assembly 4, the plurality of spare drill pipes 6 can be sequentially fed in a simple path to the bottom of the power head 10 in the portal frame 1 in an orderly manner, which facilitates drill pipe connection. The portal pile driver can complete the process of grabbing and connecting the drill pipes with a simple operation, and not only can it meet the construction requirements of super-long piles through drill pipe connection, but it also does not need to set the height of the portal frame 1 high. Therefore, under the premise of using a low portal frame 1, the portal pile driver provided in this embodiment arranges the drill pipes horizontally and assembles them in an orderly manner, so that it can realize the construction of cast-in-place piles of various pile lengths through an automated and highly safe drill pipe connection operation even in spaces of different heights (including low spaces such as tunnels).

[0084] The portal pile driver provided by this embodiment breaks the conventional design concept in which the height of the pillar and the length of the drill must meet the designed pile length in the current mainstream heavy-duty pile drivers, and solves the problem that the center of gravity of the pile driver is often shifted by fixing a spare heavy-duty drill vertically in advance, which makes the front end of the pile driver too heavy. The portal pile driver provided by this embodiment is a disruptive technology to existing pile drivers, and can realize automatic drill pipe connection by lowering the portal frame 1 and laying the drill pipe flat, which is an efficient, energy-saving, safe, highly automated and low-cost pile driver.

[0085] In the conventional pile driver, when a spare heavy drill is fixed vertically in advance on one side of the upright column of the portal frame 1, the counterweight must be increased to ensure the balance of the center of gravity of the pile driver. As a result, in the case of a 70-meter pile, the weight of the pile driver tends to increase from 150 tons to 300 tons or more in many cases, which not only increases the construction cost, but also requires laying a large area of ​​steel plate at the construction site to ensure the safety of the pile, which further increases the construction cost. In the portal pile driver provided by this embodiment, the drill pipe is laid flat, so that the drilling depth of the drill is not limited by the length of one drill, and there is no need to increase the counterweight to ensure the balance of the center of gravity of the pile driver. As a result, the weight of the portal pile driver provided by this embodiment can be reduced by 30 to 40% compared to the conventional pile driver, thereby effectively reducing the manufacturing cost of the pile driver. In addition, the portal pile driver provided in this embodiment is in the portal frame 1, and through the cooperation of the force application mechanism and the power head 10, the soil body can be pushed out and the pile hole can be rotary excavated during the process of drilling downward with the drill pipe, so that construction can be carried out without removing soil, thereby achieving the purpose of saving energy and reducing exhaust gases.

[0086] Compared with CN202688997U, the portal pile driver provided in this embodiment provides a specific technical solution to lower the height and center of gravity of the portal frame 1 and increase the construction pile length.

[0087] Compared with the technical solution of CN208950504U, which can only double the pile driving depth and increases the potential risk of the center of gravity of the pile driver becoming unstable, the portal pile driver provided in this embodiment can more than double the pile driving depth without increasing the height of the pile driver, and can enhance the stability of the pile driver (the portal pile driver provided in this embodiment can increase the quantity or length of the spare drill pipes 6 to increase the pile driving depth without having to consider the instability of the center of gravity caused by standing the drill pipes upright).

[0088] Compared with CN203851446U, the portal pile driver provided by this embodiment has complex functions that cannot be associated with the agricultural technology field, such as drill rotation, drilling downward, lifting the drill, automatic drill pipe connection, etc., by using the vertical force applying mechanism on the portal frame 1, the power head 10, and the connector assembly with elastic latch. In addition, the portal pile driver provided by this embodiment uses the portal frame 1 instead of the single-column stand of the conventional pile driver, so that the spare drill pipe 6 does not need to follow a complex path around the single-column stand, and can move directly into the portal frame 1 or pass through the portal frame 1.

[0089] Compared with CN209556966U, the portal pile driver provided in this embodiment can first grab the drill pipes and then remove the moving assembly 3 by the pick-up part 40, and the drill pipes will not fall freely during the entire process. During operation, the control system 9 of the portal pile driver can automatically transport multiple drill pipes to the material supply position in succession by pre-programming the control system 9, and the pick-up part 40 can automatically pick up multiple drill pipes in succession, eliminating the need to transport the drill pipes by hand or other auxiliary machines.

[0090] Compared with CN110939132A, the self-adjusting counterweight assembly 8 of the portal pile driver provided in this embodiment can cooperate with the control system 9 and the monitoring system and has the characteristics of rapid adjustment. The method of adjusting the horizontal center of gravity position by changing the moment of the portal pile driver provided in this embodiment better meets the requirements of the portal pile driver provided in this embodiment.

[0091] The pile driver disclosed in CN216381270U, ​​CN105756060A, and CN107023267B is limited to its conventional single-pillar structure, so that its corresponding drill pipe grasping and moving process all have to go around the single pillar, and subsequently the mechanism on the pile driver becomes complicated and difficult to simplify. The vertical arrangement of the spare drill pipe 6 is conducive to the transportation and connection of the drill pipe, but brings about the problem of the unstable pile foundation. The portal pile driver provided in this embodiment uses the method of laying the drill pipe 6 flat, and coupled with the improvement of the structure of the whole machine, it can use the low portal frame 1 and at the same time realize the smooth process of grasping and moving the drill pipe. Compared with a pile driver with a vertically arranged drill pipe, the portal pile driver provided by this embodiment is safer and more stable, and at the same time, this embodiment can increase the contact area between the drill pipe and the pile frame platform 2 by laying the drill pipe flat, thereby changing the point load when vertically arranged into a surface load with a smaller pressure intensity after laying flat, effectively reducing the strength requirement of the pile driver, and thereby reducing the manufacturing cost of the pile driver.

[0092] As shown in FIG. 35, this embodiment further provides a method for constructing cast-in-place piles, which uses the above-mentioned portal pile driver: Step S1: activating the moving assembly 3 to transport one of the drill pipes on the moving assembly 3 to a material supply position; Step S2: starting the lift assembly 4, making the pick-up part 40 pick up the drill pipe at the material supply position, and after the moving assembly 3 moves away from the material supply position, rotating the lift assembly 4, and driving the pick-up part 40 to switch the drill pipe picked up by the pick-up part 40 from a horizontal state to an upright state and move it under the power head 10; Step S3 of connecting the tip of the drill pipe picked up by the pick-up part 40 to the power head 10 and then causing the pick-up part 40 to release the picked-up drill pipe; Step S4: driving the power head 10 to lower, moving the drill pipe connected to the lower part of the power head 10 to the tip of the drill pipe buried in the design pile position of the cast-in-place pile, and then connecting the lower end of the drill pipe connected to the lower part of the power head 10 to the tip of the buried drill pipe; Step S5: continue driving the power head 10 to lower it, start the power head 10, rotate the drill pipe connected to the bottom of the power head 10, and make it penetrate into the soil body at the design pile position of the cast-in-place pile; Step S6: separating the power head 10 from the drill pipe connected thereto, and then driving the power head 10 to raise it; and Step S7 of repeating Steps S1 to S6 to sequentially connect a plurality of drill pipes on the moving assembly 3 and cause them to penetrate into the soil body at the designed pile position of the cast-in-place pile.

[0093] Steps S1 to S7 in the cast-in-place pile construction method provided by this embodiment are all connection processes of drill pipes laid flat on the pile frame platform 2, that is, they are all connection processes of the above-mentioned spare drill pipe 6. Since the existing drill pipe 5 with a drill bit is usually directly connected to the bottom of the power head 10 for drilling downward, the cast-in-place pile construction method provided by this embodiment can further include steps S01 and S02 before step S1.

[0094] Step S01: The portal pile driver is moved to a cast-in-place pile construction area, and the power head 10 on the portal frame 1 of the portal pile driver is positioned above the designed pile position of the cast-in-place pile.

[0095] Step S02: A drill pipe with a drill bit is connected to the lower part of the power head 10 on the portal frame 1 of the portal pile driver, the power head 10 is lowered, the power head 10 is started, and the drill pipe with the drill bit is driven to rotate and penetrate into the soil body at the design pile position of the cast-in-place pile.

[0096] The method for constructing a cast-in-place pile provided by this embodiment is applied to the above-mentioned portal pile driver, so that the method for constructing a cast-in-place pile also allocates the weight of the pile driver to ensure the stability of the portal pile driver by horizontally arranging a number of drill pipes on the moving assembly 3. In the process of connecting the drill pipes, the process of drilling immediately after connection and the horizontally arranged drill pipes that have not yet been connected can be used to prevent the center of gravity of the portal pile driver from shifting too far to the portal frame 1, so that the stability of the portal pile driver during use can be continuously ensured.

[0097] Finally, the above embodiments are only used to explain the technical solutions of the present invention, and are not intended to limit the same. The present invention will be described in detail with reference to the above embodiments. Those skilled in the art can modify the technical solutions described in the above embodiments, or make equivalent replacements for part or all of the technical features therein, and these modifications or replacements do not take the essence of the corresponding technical solutions out of the scope of the technical solutions of the embodiments of the present invention. [Explanation of symbols]

[0098] 1-Portal frame 10-Power Head 100-Positioning parts 11-Fixed Rod 12-Lifting rod 2-Pile Frame Platform 20-Guide rail 21-Turntable mechanism 22-Extension Frame 3- Moving Assembly 30-Slide mechanism 300-1st locking position 301-Second locking position 302-Pulley 303-Scissor mechanism 304-Slide bracket 4-Lift Assembly 40-Pickup parts 41 - Mechanical Arm 5- Existing drill pipe 6- Spare Drill Pipe 7-Travel Assembly 8-Self-adjusting counterweight assembly 9-Control System

Claims

1. A portal pile driver comprising: a portal frame (1), a pile frame platform (2), a moving assembly (3) and a lift assembly (4); The portal frame (1) is disposed vertically on one side of the pile frame platform (2), and a power head (10) capable of ascending and descending is attached to the portal frame (1), and the power head (10) is detachably connected to one end of any drill pipe moving downward therefrom; a material supply position is provided at a position on the pile frame platform (2) at a side of the portal frame (1), and the projection of the central axis of the power head (10) on the pile frame platform (2) is in the extension direction of the material supply position; The moving assembly (3) is installed on one or both sides of the material supply position, a plurality of drill pipes are horizontally arranged on the moving assembly (3), and each of the drill pipes is perpendicular to a plane of the portal frame (1), and the moving assembly (3) is used to move in a direction parallel to the plane of the portal frame (1) in the horizontal plane and transport the plurality of drill pipes to the material supply position in sequence; The lift assembly (4) includes a pick-up part (40), which is used to grab a drill pipe at the material supply position, and the lift assembly (4) is used to rotate relative to the pile frame platform (2) and, during rotation, switch the drill pipe grabbed by the pick-up part (40) from a horizontal state to an upright state and move it below the power head (10); the moving assembly (3) includes a plurality of slide mechanisms (30), the slide mechanisms (30) being arranged at intervals in a direction perpendicular to a plane of the portal frame (1), the slide mechanisms (30) being used to support and move the plurality of drill pipes; In a direction perpendicular to a plane of the portal frame (1), the pickup part (40) at the material supply position and the plurality of slide mechanisms (30) are alternately arranged; The slide mechanism (30) is a telescopic structure, and the slide mechanism (30) is used to raise and lower the drill pipe supported by it during the telescopic process; A portal pile driver characterized in that each of the slide mechanisms (30) is provided with a first locking position (300) and a second locking position (301) spaced apart, the first locking positions (300) of the multiple slide mechanisms (30) are arranged in the same straight line to support the same drill pipe, and the second locking positions (301) of the multiple slide mechanisms (30) are arranged in the same straight line to support the same drill pipe.

2. A plurality of guide rails (20) are installed on the pile frame platform (2), the plurality of guide rails (20) are spaced apart in a direction perpendicular to the plane of the portal frame (1), and each of the guide rails (20) extends in a direction parallel to the plane of the portal frame (1); 2. The portal pile driver according to claim 1, wherein the slide mechanisms (30) are slidably connected to the guide rails (20) in one-to-one correspondence.

3. The lift assembly (4) includes a mechanical arm (41) and a lift-up drive mechanism, and the pick-up part (40) is a mechanical chuck; The mechanical arm (41) includes a hinged end and an unconnected end, the hinged end of the mechanical arm (41) being hingedly connected to the pile frame platform (2) and the unconnected end of the mechanical arm (41) being hanging; The gantry pile driver according to claim 1 or 2, characterized in that the mechanical chuck is attached to the mechanical arm (41), the output end of the lift-up drive mechanism is connected to the mechanical arm (41), and the lift-up drive mechanism is used to drive the mechanical arm (41) to rotate relative to the pile frame platform (2) to switch the mechanical arm (41) between a horizontal state and an upright state.

4. The hinged end of the machine arm (41) is between the portal frame (1) and the material supply position, and the machine chuck is attached to the arm surface of the machine arm (41) facing away from the pile frame platform (2), or The gate pile driver of claim 3, characterized in that the mechanical chuck is attached to an arm surface of the mechanical arm (41) facing the pile frame platform (2), and a turntable mechanism (21) is attached to the pile frame platform (2), and a hinge connection end of the mechanical arm (41) is hingedly connected to the turntable mechanism (21), and the turntable mechanism (21) is used to drive the mechanical arm (41) and rotate it about its central axis as a rotation axis.

5. an extension frame (22) is connected to the side of the pile frame platform (2) where the portal frame (1) is installed, and a hinge connection end of the machine arm (41) is hingedly connected to the extension frame (22), and the machine arm (41) can stand upright on the side of the portal frame (1) opposite to the material supply position after passing through the portal frame (1) in the process of rotating relative to the pile frame platform (2); The portal pile driver according to claim 3, characterized in that the mechanical chuck is attached to the arm surface of the mechanical arm (41) facing the pile frame platform (2).

6. a self-adjusting counterweight assembly (8), a monitoring system and a control system (9), the self-adjusting counterweight assembly (8) is attached to the other side of the pile frame platform (2) remote from the portal frame (1), and the self-adjusting counterweight assembly (8) includes a moving part that can move in a direction perpendicular to a plane of the portal frame (1); The self-adjusting counterweight assembly (8) and the monitoring system are all connected to the control system (9), the monitoring system is used to monitor weight changes in the portal frame (1) of the portal pile driver, and the control system (9) is used to calculate the amount of movement of the moving part according to the weight changes monitored by the monitoring system, and to move the moving part in a direction perpendicular to a plane of the portal frame (1) according to the amount of movement.

7. A method for constructing a cast-in-place pile using the portal pile driver according to claim 1 or 2, Step S1: activating the moving assembly (3) to transport one of the drill pipes on the moving assembly (3) to the material supply position; Step S2: starting the lift assembly (4) to make the pick-up part (40) grab the drill pipe at the material supply position, and after the moving assembly (3) moves away from the material supply position, rotating the lift assembly (4) to drive the drill pipe grabbed by the pick-up part (40) to switch from a horizontal state to an upright state and move it under the power head (10); Step S3: connecting the tip of the drill pipe picked up by the pick-up part (40) to the power head (10), and then causing the pick-up part (40) to release the picked-up drill pipe; Step S4: driving the power head (10) to descend, moving the drill pipe connected to the lower part of the power head (10) to the tip of the drill pipe buried at the design pile position of the cast-in-place pile, and then connecting the lower end of the drill pipe connected to the lower part of the power head (10) to the tip of the buried drill pipe; Step S5: continuing to drive the power head (10) to lower it, starting the power head (10), and rotating the drill pipe connected below the power head (10) to make it penetrate into the soil body at the design pile position of the cast-in-place pile; Step S6: separating the power head (10) from the drill pipe connected below it, and then driving the power head (10) to lift; and step S7 of repeating steps S1 to S6 and sequentially connecting a plurality of drill pipes on the moving assembly (3) to penetrate into the soil body at the design pile position of the cast-in-place pile.

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