CN116043845A - Pile foundation pile extension construction method - Google Patents

Abstract

The application discloses a pile foundation pile extension construction method, which comprises the following steps: step 1, installing a limiting mechanism on a pile pressing machine, lifting the pipe pile to the limiting mechanism, and enabling the pipe pile to be vertically lifted to a pile clamping device for pile insertion; step 2, pile pressing is carried out on the tubular pile through a pile pressing hydraulic cylinder, and the pile pressing process of the tubular pile is observed in real time; step 3, pile splicing operation is carried out on the second section of pipe pile and the first section of pipe pile; step 4, pile driving operation is carried out on the tail section pipe pile through a pile driving device; and 5, connecting and anchoring the tail section pipe pile and the bearing platform. The pile clamping device has the advantages that the pile clamping device is not easy to fix the tubular pile due to the fact that the tubular pile is easy to shake in the process of lifting the tubular pile when the tubular pile is constructed is effectively reduced, and the pile clamping device is easy to collide with the pile pressing hydraulic cylinder due to the shaking of the tubular pile.

Description

Pile foundation pile extension construction method

Technical Field

The application relates to the technical field of civil engineering, in particular to a pile foundation pile extension construction method.

Background

During construction, the foundation needs to be treated, and a plurality of pipe piles are placed in the foundation by utilizing a pile pressing machine to strengthen the bearing capacity of soil layers in the foundation, wherein the pile pressing machine is commonly used for pile construction of soft soil layers, such as underground railways, harbors, bridges, reservoir power stations, offshore oil production platforms, national defense engineering and the like.

In the related art, a pile pressing machine generally comprises a pile lifting crane, a pile clamping device, a pile pressing hydraulic cylinder and a pile frame for bearing the pile lifting crane, the pile clamping device and the pile pressing hydraulic cylinder. When the pile is pressed, the pile hoist lifts the pipe pile above the pile clamping device, the pile body of the pipe pile is clamped by the pile clamping device, and the pile clamping device is pushed by the pile pressing hydraulic cylinder so as to drive the pipe pile to be pressed into the foundation downwards.

However, in the existing pile pressing machine, the pile is lifted by adopting the crane in the construction of the pile, and in the process of lifting the pile, the pile is easy to shake, so that the pile clamping device is not easy to fix the pile, and the pile is easy to collide with the pile pressing hydraulic cylinder due to the shake of the pile.

Disclosure of Invention

In order to improve the relevant in-process of hoisting the tubular pile, the tubular pile is easy to shake and leads to the difficult tubular pile of clamp to fix, and is easy because the tubular pile rocks and produces the drawback of the condition that bumps with the pile pressing pneumatic cylinder, this application provides a pile foundation pile extension construction method.

The pile foundation pile extension construction method provided by the application adopts the following technical scheme:

a pile foundation pile extension construction method comprises the following steps:

step 1, installing a limiting mechanism on a pile pressing machine, lifting the pipe pile to the limiting mechanism, and enabling the pipe pile to be vertically lifted to a pile clamping device for pile insertion;

step 2, pile pressing is carried out on the tubular pile through a pile pressing hydraulic cylinder, and the pile pressing process of the tubular pile is observed in real time;

step 3, pile splicing operation is carried out on the second section of pipe pile and the first section of pipe pile;

step 4, pile driving operation is carried out on the tail section pipe pile through a pile driving device;

and 5, connecting and anchoring the tail section pipe pile and the bearing platform.

Through adopting above-mentioned technical scheme, when constructing tubular pile, at first through hoist and mount hoist with tubular pile handling to stop gear top, spacing to tubular pile through stop gear for tubular pile vertical handling is in the pile clamping ware. And then the pile pressing hydraulic cylinder works to press the tubular pile, when the head of the first tubular pile is pressed to a certain height from the ground, the pile pressing is stopped, the second tubular pile and the head of the first tubular pile are lowered to perform pile alignment, and after the second tubular pile is limited by the limiting mechanism, the two tubular piles are spliced. After cooling for a certain time, pile pressing is carried out on the pile, and then the operation is repeated to construct a plurality of pipe piles. And (3) when the tail pipe pile is constructed, conveying the tail pipe pile to a design position below the ground by using a pile conveyer, constructing a bearing platform, and connecting and anchoring the tail pipe pile and the bearing platform. Effectively reduces the situations that the pile clamping device is not easy to fix the tubular pile and the tubular pile is easy to collide with the pile pressing hydraulic cylinder due to the shaking of the tubular pile when the tubular pile is lifted in the process of construction.

Preferably, in the step 1, after the tubular pile is lifted, a pile cap is installed at one end of the first-section tubular pile for inserting into the foundation, and after the tubular pile is inserted into the foundation to a certain depth, whether the position and the perpendicularity of the tubular pile meet the requirements is checked, and then the subsequent operation is continued.

Through adopting above-mentioned technical scheme, when constructing first section pipe pile, install the pile cap in the one end of tubular pile to slowly hang the one end of tubular pile to stop gear top, make stop gear hang the one end of tubular pile vertically in the pile clamping ware, with right the tubular pile, carry out follow-up pile inserting operation again.

Preferably, the step 2 specifically includes the following steps:

step 21, marking a length mark on the pile body of each section of pipe pile;

and 22, controlling pile pressing speed during pile pressing, and observing a pile pressing process.

By adopting the technical scheme, before pile pressing, a length mark is drawn on the pile body so as to observe the soil penetration depth of the pile and record the corresponding pressure value when the pile is pressed, frequently observe the pile pressing process of the pile in the pile pressing process, and make process records.

Preferably, the step 3 specifically includes the following steps:

step 31, cleaning adjacent end plates of two sections of tubular piles, aligning the end plates, and then preliminarily adjusting verticality;

and 32, spot welding the end plates adjacent to the two sections of tubular piles, and performing secondary adjustment on verticality.

Through adopting above-mentioned technical scheme, when first section tubular pile is pressed to the pile head when certain height from ground, stop pressing the stake, handling second section tubular pile makes second section tubular pile and first section tubular pile carry out to the stake, after adjusting the straightness that hangs down of two sections tubular piles, two workman weld it symmetrically simultaneously. And after the verticality of the two sections of pipe piles is regulated again, pressing the second section of pipe piles.

Preferably, in the step 5, before the construction of the pile cap, the bearing capacity of the foundation needs to be detected, after the bearing capacity reaches the design strength, the pile cap is excavated, and when the pile cap elevation of the pipe pile is excavated, the excavation is stopped, and the soil in the pipe pile is excavated manually.

By adopting the technical scheme, after the pipe pile construction of all design positions is finished, the bearing capacity of the foundation is detected, and after the bearing capacity of the foundation reaches the design strength, the bearing platform is constructed. After the bearing platform is excavated, concrete pouring is carried out on the bearing platform, concrete is poured into the tail section pipe pile, an anchor reinforcing steel bar which is used for extending into the bearing platform is welded on an end plate of the tail section pipe pile, and binding operation of the bearing platform reinforcing steel bar is carried out, so that the tail section pipe pile and the bearing platform can be connected and anchored.

Preferably, the pile pressing machine comprises a pile frame, a pile clamping device and a pile pressing hydraulic cylinder which are sequentially arranged, an operation platform is arranged on one side of the pile frame in a sliding manner, a fixing plate is movably arranged on one side of the operation platform, which is away from the pile frame, and the pile clamping device and the pile pressing hydraulic cylinder are arranged on one side of the fixing plate, which is away from the operation platform; the limiting mechanism comprises a supporting plate, guide rods are respectively arranged at four corners of the fixing plate in a penetrating manner, the bottom ends of the guide rods are fixedly connected to the operation platform, the top ends of the guide rods penetrate through the fixing plate and are fixedly connected to the supporting plate, a piston rod of the pile pressing hydraulic cylinder is connected to the supporting plate, and the fixing plate can move along the length direction of the guide rods; the guide groove is formed in the supporting plate, the groove wall of the guide groove is obliquely arranged from one side away from the guide rod to one side close to the guide rod, the groove bottom of the guide groove is provided with a penetrating groove, and the penetrating groove is formed in the height direction of the supporting plate.

Through adopting above-mentioned technical scheme, when constructing tubular pile, firstly through hanging the pile hoist with the tubular pile handling to backup pad top for the one end butt of tubular pile is in the cell wall of guide slot, and slide to wearing inslot gradually along the cell wall of guide slot, make the vertical handling of tubular pile to in the clamp, along with the work of pile pressing pneumatic cylinder, make the fixed plate upwards move, the pile body of clamp centre gripping tubular pile, follow closely, the fixed plate drives the tubular pile down along with pile pressing pneumatic cylinder down move in the foundation, thereby press the tubular pile.

Preferably, the pile clamping device comprises a mounting seat, a groove penetrating through the upper surface and the lower surface is formed in the mounting seat, two bidirectional screw rods are arranged on the groove wall of the groove, clamping blocks are sleeved at two ends of the bidirectional screw rods respectively, two ends of the clamping blocks are connected with the two bidirectional screw rods in a threaded mode respectively, and a transmission assembly used for enabling the two bidirectional screw rods to rotate synchronously is arranged between the two bidirectional screw rods.

Through adopting above-mentioned technical scheme, make two-way lead screws syntropy rotate through drive assembly, two grip blocks are along being close to each other or the direction that is away from each other removes to press from both sides tight or loosen two opposite sides of tubular pile.

Preferably, the transmission assembly comprises a transmission shaft arranged along the width direction of the mounting seat and a bevel gear set arranged between the transmission shaft and the two-way screw rods, wherein a set of bevel gear sets are arranged between two ends of the transmission shaft and the two-way screw rods, and a driving assembly used for driving the clamping blocks to clamp the pipe pile before pile pressing and driving the clamping blocks to release the state of clamping the pipe pile after pile pressing is arranged between the operation platform and the support plate.

Through adopting above-mentioned technical scheme, when one of them bevel gear operation in the drive bevel gear group for corresponding two-way lead screw rotates with the transmission shaft, thereby makes another two-way lead screw synchronous rotation, and two grip blocks remove along the direction that is close to each other or is kept away from each other this moment.

Preferably, the driving assembly comprises a rotating rod arranged between the supporting plate and the operating platform and racks respectively arranged at two ends of the rotating rod, the two racks are oppositely arranged along the diameter direction of the rotating rod, a driving motor is arranged on the supporting plate, an output shaft of the driving motor is connected to the end part of the rotating rod, one of the two-way screw rods is sleeved with a gear close to one end of the rotating rod, and the two racks are respectively meshed with the gear along with the movement of the fixing plate.

Through adopting above-mentioned technical scheme, when the pile pressing pneumatic cylinder during operation, the fixed plate drives the mount pad and upwards moves, and the gear is connected with the rack meshing that is located the bottom of dwang this moment for bevel gear group drives two-way lead screws and rotates in step, thereby makes two grip blocks remove towards the direction of keeping away from each other, and two grip blocks release the state of pressing from both sides tight tubular pile. After the pile pressing hydraulic cylinder drives the mounting seat to move upwards for a certain distance, the driving motor drives the rotating rod to rotate, so that the rack positioned at the top end of the rotating rod rotates to a state facing the mounting seat, and the gear is positioned above the rack. Along with the work of pile pressing pneumatic cylinder, pile pressing pneumatic cylinder drives the fixed plate and moves down, and the mount pad synchronous downstream makes gear and rack meshing be connected for two-way lead screws synchronous rotation, thereby makes two grip blocks remove towards the direction that is close to each other, and two grip blocks press from both sides the pile body of tubular pile. Along with the movement of the fixed plate, the clamping blocks clamp the pipe pile and drive the pipe pile to be pressed into the foundation downwards.

Preferably, the groove wall of the through groove is rotatably provided with a plurality of guide rollers, and the guide rollers are arranged along the width direction of the supporting plate.

Through adopting above-mentioned technical scheme, the one end of tubular pile slides to wearing the inslot gradually along the cell wall of guide slot, and the pile body butt of tubular pile is in the guide roll for the tubular pile descends to in the pile clamping device better.

In summary, the present application includes at least one of the following beneficial technical effects:

1. through the arrangement of the limiting mechanism, the limiting mechanism limits the tubular pile after the tubular pile is lifted to the corresponding position, so that the situation that the tubular pile is difficult to fix due to the fact that the pile clamping device is easy to shake and the tubular pile collides with the pile pressing hydraulic cylinder is effectively reduced;

2. through the setting of drive assembly for drive the two grip blocks and press the stake again before pressing the stake drive assembly drive two grip blocks and release the state of pressing the tubular pile after pressing the stake.

Drawings

Fig. 1 is a flow diagram of an embodiment of the present application.

Fig. 2 is a schematic structural view of a pile pressing machine according to an embodiment of the present application.

Fig. 3 is a schematic structural view of the pile driver according to the embodiment of the present application, with the pile frame removed.

Fig. 4 is a schematic structural diagram of a pile pressing hydraulic cylinder driving a fixing plate to ascend in the embodiment of the application.

Fig. 5 is an enlarged view of a portion a in fig. 3.

Fig. 6 is a cross-sectional view of an embodiment of the present application.

Fig. 7 is an enlarged view of a portion B in fig. 6.

Reference numerals illustrate:

10. a pile frame; 20. pile clamping device; 21. a mounting base; 22. a groove; 23. a two-way screw rod; 24. a clamping block; 30. pile pressing hydraulic cylinders; 40. an operating platform; 41. a fixing plate; 42. perforating; 43. a through hole; 44. a guide rod; 50. a support plate; 51. a guide groove; 52. penetrating a groove; 53. a receiving groove; 54. a guide roller; 60. a transmission shaft; 61. a bevel gear set; 70. a rotating lever; 71. a rack; 72. a gear; 73. and driving the motor.

Detailed Description

The present application is described in further detail below in conjunction with figures 1-7.

Referring to fig. 1, a pile foundation pile extension construction method disclosed in the present application includes the following steps:

step 1, installing a limiting mechanism on a pile pressing machine, lifting the pipe pile to the limiting mechanism, and vertically lifting the pipe pile to a pile clamping device 20 for pile insertion;

before a single pipe pile is lifted, a two-head hook lifting method is adopted when the pipe pile is lifted transversely, and a single-point method is adopted when the pipe pile is lifted vertically;

in addition, after a single pipe pile is lifted, a pile cap is installed at one end of the first pipe pile for being inserted into a foundation, and one end of the pipe pile is slowly lifted to a limiting mechanism, so that the limiting mechanism vertically lifts one end of the pipe pile into a pile clamping device 20 to centralize the pipe pile, then an open (closed) pile tip is welded according to the requirement, the pipe pile is inserted into the foundation to a depth of 0.5m-1.0m, and subsequent operation is performed after the position and the perpendicularity of the pipe pile are ensured to meet the requirement;

step 2, pile pressing is carried out on the tubular pile through a pile pressing hydraulic cylinder 30, and the pile pressing process of the tubular pile is observed in real time;

the pile pressing method for the tubular pile specifically comprises the following steps:

step 21, marking a length mark on the pile body of each section of pipe pile;

before pile pressing, marking a length mark with a meter as a unit at the pile body so as to observe the depth of the pile in soil and record a corresponding pressure value.

And 22, controlling pile pressing speed during pile pressing, and observing a pile pressing process.

In the beginning stage of pile pressing, the pile pressing speed is selected according to a geological report, and the pile pressing speed is not too high, and is preferably 2.0-3.0 m/min. And (3) frequently observing the pile pressing process of the pipe pile in the pile pressing process, and recording the process. Note that the verticality of the pile body and the pile frame 10 should be controlled with emphasis on the initial pile pressing range of 2-3m, and the verticality should be controlled with emphasis on the first-section pipe pile.

Step 3, pile splicing operation is carried out on the second section of pipe pile and the first section of pipe pile;

the pile extension operation specifically comprises the following steps:

step 31, cleaning adjacent end plates of two sections of tubular piles, aligning the end plates, and then preliminarily adjusting verticality;

before pile extension, pile compression is stopped when the head of the first-section pipe pile is pressed to a height of about 0.5-1.0m from the ground, and after adjacent end plates of two sections of pipe piles are cleaned, a second-section pipe pile is lowered for pile alignment.

And 32, spot welding the end plates adjacent to the two sections of tubular piles, and performing secondary adjustment on verticality.

After the end plates of the two sections of pipe piles are aligned and the verticality is primarily adjusted, spot welding is performed on the periphery of the groove for 4-6 points by adopting manual arc welding, and secondary verticality adjustment is performed on the two sections of pipe piles again.

In addition, it should be noted that, in order to reduce the bending of the joint caused by welding deformation, two workers need to weld the end plates of two sections of tubular piles symmetrically at the same time, the number of welding layers is not less than two, and the welding seams should be even and full (the welding seams are flat with the grooves). And after the welding is finished, naturally cooling for more than 5 minutes, brushing a layer of asphalt anti-corrosion paint on the welding part, and continuously pressing the pile. If the multi-section tubular pile is required to be operated, the working procedures of the steps 1 to 3 are repeated.

Step 4, pile driving operation is carried out on the tail section pipe pile through a pile driving device;

since the pile top design elevation is generally below the ground, the pile pressing cylinder 30 cannot press the tail pipe pile into the design position below the ground, and thus pile driving by the pile driving device is necessary. It should be noted that the axis of the pile driver coincides with the pile body during pile driving.

In addition, through the on-site elevation measurement, the last pile-driving depth mark needs to be marked on the pile driver in advance, and the pile driving is accurately conveyed to the designed elevation through the cooperation of a level gauge and observation. At the same time, the last 1m depth mark is marked on the pile driver, and the final pressure value is recorded in detail. If the pile is exposed out of the ground after pile delivery or cannot be delivered to the designed elevation of the pile top, a special pile cutter is needed for pile cutting of the tail section pipe pile. And after pile delivery is completed, the pile pressing machine is moved and adjusted, and the operation is repeated to perform pile construction at the next construction position.

And 5, connecting and anchoring the tail section pipe pile and the bearing platform.

And after the construction of the tubular pile is finished, detecting the bearing capacity of the foundation, and excavating the bearing platform after the bearing capacity reaches the design strength. And when the pile is dug to the vicinity of the pile head elevation, stopping the excavation, and manually excavating soil in the pipe pile. When the pile cap is constructed, a concrete cushion layer is poured firstly, then a round steel plate supporting plate is hung and placed until the round steel plate supporting plate stretches into the pile tube by about 1.0m-1.5m, then concrete pouring is carried out on the pile cap, concrete with the same label as the pile tube is poured into the pile tube, meanwhile, an anchor reinforcing steel bar used for stretching into the pile cap is welded on an end plate of the tail section pile tube, binding operation of the pile cap reinforcing steel bar is carried out, and the tail section pile tube and the pile cap can be connected and anchored.

Referring to fig. 2 and 3, the pile driver mainly includes a pile frame 10, a pile clamp 20, and a pile pressing cylinder 30, which are sequentially disposed from bottom to top. The pile frame 10 is internally provided with a double-shaft moving mechanism for enabling the pile clamp 20 and the pile pressing hydraulic cylinder 30 to move transversely and longitudinally, thereby facilitating adjustment of the construction position of the pipe pile. In this embodiment, the dual-axis moving mechanism is in the prior art, and a detailed description is omitted here.

Referring to fig. 2 and 3, an operation platform 40 is slidably installed at one side of the pile frame 10 facing away from the foundation, the operation platform 40 is provided in a rectangular parallelepiped shape, and one end of the operation platform 40 facing the pile frame 10 is connected to a biaxial movement mechanism, so that the operation platform 40 can move laterally and longitudinally with respect to the foundation. The side of the operation platform 40, which is away from the pile frame 10, is movably provided with a fixing plate 41, the fixing plate 41 can slide up and down relative to the operation platform 40, and the pile clamp 20 is arranged on the side of the fixing plate 41, which is away from the operation platform 40. Referring to fig. 4, a through hole 42 is formed in one side, facing away from the pile frame 10, of the operation platform 40, the through hole 42 penetrates through the operation platform 40, a through hole 43 is correspondingly formed in the fixing plate 41, the through hole 42 is correspondingly formed with the through hole 43, and circle centers of the through hole 43 and the through hole 42 are all in the same straight line with the center of the pile clamping device 20, so that one end of the pipe pile enters the pile clamping device 20 after being limited by the limiting mechanism, and the pile clamping device 20 is pushed by the pile pressing hydraulic cylinder 30, so that the pipe pile is driven to sequentially penetrate through the through hole 43 and the through hole 42 and then is pressed into a foundation downwards.

Referring to fig. 5 and 6, guide rods 44 are vertically penetrated at four corners of the fixing plate 41, bottom ends of the guide rods 44 are fixedly connected to the operation platform 40, top ends of the guide rods 44 penetrate through the fixing plate 41 and are fixedly connected to a limiting mechanism, and the limiting mechanism is located above the pile pressing hydraulic cylinder 30 and the pile clamping device 20. Specifically, the limiting mechanism includes a support plate 50, where the support plate 50 is disposed in a cuboid shape, and one side of the support plate 50 facing the pile gripper 20 is fixedly connected to the top end of the guide rod 44. Referring to fig. 7, the support plate 50 is provided with a guide groove 51, the guide groove 51 penetrates through one side of the support plate 50 away from the guide rod 44, the guide groove 51 is square, and the groove wall of the guide groove 51 is inclined downwards from one side away from the guide rod 44 to one side close to the guide rod 44. The groove bottom of the guide groove 51 is provided with a through groove 52, the cross section of the through groove 52 is circular, and the through groove 52 penetrates through the support plate 50 towards one side of the guide rod 44. The groove wall of the through groove 52 is provided with a plurality of accommodating grooves 53 along the circumferential direction, the accommodating grooves 53 are provided along the height direction of the supporting plate 50, guide rollers 54 are rotatably arranged in the accommodating grooves 53 through rotating shafts, and the guide rollers 54 are arranged along the width direction of the supporting plate 50. When the pipe pile is lifted to the upper part of the supporting plate 50, one end of the pipe pile is abutted against the groove wall of the guide groove 51 and gradually slides into the through groove 52 along the groove wall of the guide groove 51, and the pipe pile is lifted to the pile clamping device 20 better through the arrangement of the guide roller 54.

Referring to fig. 4 and 5, the pile pressing cylinder 30 is fixedly mounted to a side of the fixing plate 41 facing away from the operation platform 40, and a piston rod of the pile pressing cylinder 30 is fixedly connected to a side of the support plate 50 facing the guide rod 44. When the pile pressing hydraulic cylinder 30 is operated, the fixing plate 41 can move upward along the length direction of the guide rod 44 with respect to the operation platform 40.

Referring to fig. 4 and 5, specifically, pile gripper 20 includes a mount 21 fixedly mounted to a side of a fixing plate 41 facing a pile pressing cylinder 30, and mount 21 is provided in a rectangular parallelepiped shape. A groove 22 is formed on one side of the mounting seat 21, the groove 22 penetrates through the upper surface and the lower surface of the mounting seat 21, and the center point of the groove 22 is in the same straight line with the center of the through hole 43 and the through hole 42. Two groups of bidirectional screw rods 23 are arranged in the groove wall of the groove 22, the two groups of bidirectional screw rods 23 are arranged along the height direction of the mounting seat 21, and the two groups of bidirectional screw rods 23 are mutually perpendicular. In this embodiment, two bidirectional screws 23 are provided in each group, the two bidirectional screws 23 are oppositely arranged along the length or width direction of the mounting seat 21, and two ends of the bidirectional screws 23 are respectively rotatably mounted on two opposite groove walls of the groove 22. Clamping blocks 24 are movably mounted at two ends of the two-way screw rods 23, the clamping blocks 24 are approximately arc-shaped, and two ends of the clamping blocks 24 are respectively connected with the two-way screw rods 23 in a threaded mode. When the bi-directional screw 23 is rotated, the two clamping blocks 24 are moved in directions approaching or separating from each other, thereby clamping or unclamping the two opposite sides of the pipe pile.

Referring to fig. 4 and 5, a transmission assembly for synchronously rotating each set of two bidirectional screw rods 23 is installed at the outer side of the mounting seat 21. Specifically, the transmission assembly includes a transmission shaft 60 disposed along the width direction of the mounting seat 21, and a bevel gear set 61 disposed between the transmission shaft 60 and the two-way screw rods 23, and a set of bevel gear sets 61 are mounted between two ends of the transmission shaft 60 and the two-way screw rods 23. In this embodiment, one end of each set of bidirectional screw rods 23 passes through the outside of the mounting seat 21, and the bevel gear set 61 includes two bevel gears, wherein one bevel gear is fixedly sleeved on one end of the bidirectional screw rods 23 passing through the mounting seat 21, and the other bevel gear is fixedly sleeved on one end of the transmission shaft 60. Here, the two bevel gears sleeved on the bidirectional screw rod 23 are respectively arranged on the same side of the bevel gear sleeved on the transmission shaft 60, so that the bidirectional screw rod 23 penetrating through the two ends of the clamping block 24 synchronously rotates in a clockwise direction or a counterclockwise direction.

Referring to fig. 4 and 5, a driving assembly is installed between the operation platform 40 and the support plate 50, and by means of the arrangement of the driving assembly, when the driving assembly drives the two clamping blocks 24 to clamp the pipe pile before pile pressing, pile pressing is performed, and the driving assembly drives the two clamping blocks 24 to release the state of clamping the pipe pile after pile pressing. In this embodiment, the number of driving components is two, and the two driving components respectively drive two clamping blocks 24 disposed on each set of bidirectional screw rods 23.

Referring to fig. 4 and 5, in particular, the driving assembly includes a rotating rod 70 and two racks 71 respectively installed at both ends of the rotating rod 70, and the rotating rod 70 is vertically disposed. The fixed plate 41 is provided with a slot, the slot penetrates through the upper surface and the lower surface of the fixed plate 41, the top end of the rotating rod 70 is rotatably mounted on one side of the supporting plate 50 facing the mounting seat 21, and the bottom end of the rotating rod 70 penetrates through the slot and is rotatably mounted on one side of the operating platform 40 facing the fixed plate 41. The two racks 71 are oppositely arranged along the diameter direction of the rotating rod 70, one end of one bidirectional screw rod 23 close to the rotating rod 70 is sleeved with a gear 72, and the racks 71 are in meshed connection with the gear 72. A driving motor 73 is installed at a side of the support plate 50 facing away from the rack 71, and an output shaft of the driving motor 73 is connected to a top end of the rotating rod 70.

Before pile pressing is carried out on the tubular pile, one end of the tubular pile is moved into the pile clamping device 20 through the limiting mechanism, and one end of the tubular pile is abutted to the ground. When the pile pressing hydraulic cylinder 30 works, the fixing plate 41 drives the mounting seat 21 to move upwards, and at the moment, the gear 72 is meshed with the rack 71 at the bottom end of the rotating rod 70, so that the bevel gear set 61 drives the two bidirectional screw rods 23 to rotate synchronously, and the two clamping blocks 24 move in the direction away from each other, and the two clamping blocks 24 release the state of clamping the pipe pile. After the pile pressing hydraulic cylinder 30 drives the mounting seat 21 to move upwards for a certain distance, the driving motor 73 drives the rotating rod 70 to rotate, so that the rack 71 positioned at the top end of the rotating rod 70 rotates to face the mounting seat 21, and the gear 72 is positioned above the rack 71. Along with the operation of the pile pressing hydraulic cylinder 30, the pile pressing hydraulic cylinder 30 drives the fixing plate 41 to move downwards, the mounting seat 21 moves downwards synchronously so that the gear 72 is meshed with the rack 71, the two bidirectional screw rods 23 rotate synchronously, and accordingly the two clamping blocks 24 move towards the direction approaching to each other, and the two clamping blocks 24 clamp the pile body of the pipe pile. With the movement of the fixing plate 41, the clamping blocks 24 clamp the pipe piles and drive the pipe piles to be pressed down into the foundation.

The implementation principle of the embodiment of the application is as follows: when the tubular pile is constructed, the tubular pile is lifted to the upper part of the limiting mechanism through the lifting crane, one end of the tubular pile is abutted to the groove wall of the guide groove 51 and gradually slides into the through groove 52 along the groove wall of the guide groove 51, so that the tubular pile is lifted vertically into the pile clamping device 20. And marking a length mark on the pile body of the pipe pile, pressing the pipe pile by using a pile pressing hydraulic cylinder 30, stopping pressing the pile and lowering a second pipe pile to perform pile alignment with the first pipe pile when the first pipe pile is pressed to a certain height from the ground, and after the second pipe pile is limited by a limiting mechanism, aligning end plates of the two pipe piles and performing spot welding after preliminary adjustment of verticality, and adjusting the verticality again. After cooling for a certain time, pile pressing is carried out on the pile, and then the operation is repeated to construct a plurality of pipe piles. And (3) when the tail pipe pile is constructed, conveying the tail pipe pile to a design position below the ground by using a pile conveyer, constructing a bearing platform, and connecting and anchoring the tail pipe pile and the bearing platform. Effectively reduces the situations that the pile clamping device 20 is not easy to fix the tubular pile due to the easy shaking of the tubular pile in the process of lifting the tubular pile during the construction of the tubular pile and the tubular pile is easy to collide with the pile pressing hydraulic cylinder 30 due to the shaking of the tubular pile.

The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.

Claims (10)

1. The pile foundation pile extension construction method is characterized by comprising the following steps of:

step 1, installing a limiting mechanism on a pile pressing machine, lifting the pipe pile to the limiting mechanism, and vertically lifting the pipe pile to a pile clamping device (20) for pile insertion;

step 2, pile pressing is carried out on the tubular pile through a pile pressing hydraulic cylinder (30), and the pile pressing process of the tubular pile is observed in real time;

step 3, pile splicing operation is carried out on the second section of pipe pile and the first section of pipe pile;

step 4, pile driving operation is carried out on the tail section pipe pile through a pile driving device;

and 5, connecting and anchoring the tail section pipe pile and the bearing platform.

2. The pile foundation pile extension construction method according to claim 1, wherein: in the step 1, after the pipe pile is lifted, a pile cap is installed at one end of the first-section pipe pile for being inserted into the foundation, and after the pipe pile is inserted into the foundation for a certain depth, whether the position and the perpendicularity of the pipe pile meet the requirements or not is checked, and then the follow-up operation is continued.

3. The pile foundation pile extension construction method according to claim 1, wherein: the step 2 specifically comprises the following steps:

step 21, marking a length mark on the pile body of each section of pipe pile;

and 22, controlling pile pressing speed during pile pressing, and observing a pile pressing process.

4. The pile foundation pile extension construction method according to claim 1, wherein: the step 3 specifically comprises the following steps:

step 31, cleaning adjacent end plates of two sections of tubular piles, aligning the end plates, and then preliminarily adjusting verticality;

and 32, spot welding the end plates adjacent to the two sections of tubular piles, and performing secondary adjustment on verticality.

5. The pile foundation pile extension construction method according to claim 1, wherein: in the step 5, before the construction of the bearing platform, the bearing capacity of the foundation needs to be detected, after the bearing capacity reaches the design strength, the bearing platform is excavated, and when the bearing capacity is excavated to the vicinity of the pile head elevation of the pipe pile, the excavation is stopped, and the soil in the pipe pile is excavated manually.

6. The pile foundation pile extension construction method according to claim 1, wherein: the pile pressing machine comprises a pile frame (10), a pile clamping device (20) and a pile pressing hydraulic cylinder (30) which are sequentially arranged, an operation platform (40) is arranged on one side of the pile frame (10) in a sliding mode, a fixing plate (41) is movably arranged on one side, deviating from the pile frame (10), of the operation platform (40), and the pile clamping device (20) and the pile pressing hydraulic cylinder (30) are arranged on one side, deviating from the operation platform (40), of the fixing plate (41); the limiting mechanism comprises a supporting plate (50), guide rods (44) are respectively arranged at four corners of the fixing plate (41) in a penetrating mode, the bottom ends of the guide rods (44) are fixedly connected to the operation platform (40), the top ends of the guide rods (44) penetrate through the fixing plate (41) and then are fixedly connected to the supporting plate (50), a piston rod of the pile pressing hydraulic cylinder (30) is connected to the supporting plate (50), and the fixing plate (41) can move along the length direction of the guide rods (44); the support plate (50) is provided with a guide groove (51), the groove wall of the guide groove (51) is obliquely arranged from one side away from the guide rod (44) to one side close to the guide rod (44), the groove bottom of the guide groove (51) is provided with a through groove (52), and the through groove (52) is arranged along the height direction of the support plate (50).

7. The pile foundation pile extension construction method according to claim 6, wherein: pile clamping device (20) are including mount pad (21), set up recess (22) of running through upper and lower surface in mount pad (21), the cell wall of recess (22) is provided with two-way lead screws (23), the both ends of two-way lead screws (23) all overlap and are equipped with grip block (24), the both ends of grip block (24) threaded connection respectively in two-way lead screws (23), two be provided with between two-way lead screws (23) and be used for making both synchronous pivoted drive assembly.

8. The pile foundation pile extension construction method according to claim 7, wherein: the driving assembly comprises a driving shaft (60) arranged along the width direction of the mounting seat (21) and a bevel gear set (61) arranged between the driving shaft (60) and the two-way screw rods (23), wherein a group of bevel gear sets (61) are arranged between two ends of the driving shaft (60) and the two-way screw rods (23), and a driving assembly used for driving the clamping blocks (24) to clamp the pipe pile before pile pressing and driving the clamping blocks (24) to release the state of clamping the pipe pile after pile pressing is arranged between the operating platform (40) and the supporting plate (50).

9. The pile foundation pile extension construction method according to claim 8, wherein: the driving assembly comprises a rotating rod (70) arranged between the supporting plate (50) and the operating platform (40) and racks (71) respectively arranged at two ends of the rotating rod (70), wherein the two racks (71) are oppositely arranged along the diameter direction of the rotating rod (70), the supporting plate (50) is provided with a driving motor (73), an output shaft of the driving motor (73) is connected with the end part of the rotating rod (70), one bidirectional screw rod (23) is sleeved with a gear (72) close to one end of the rotating rod (70), and along with the movement of the fixed plate (41), the two racks (71) are respectively meshed with the gear (72).

10. The pile foundation pile extension construction method according to claim 6, wherein: the groove wall of the through groove (52) is rotatably provided with a plurality of guide rollers (54), and the guide rollers (54) are arranged along the width direction of the supporting plate (50).

Images