High frequency pile sinking device and construction method suitable for low clearance

Abstract

The application discloses a high-frequency pile sinking device suitable for low clearance and a construction method. The device comprises a mounting frame, a support column, a support plate and a connecting piece, the support plate is fixed to the opposite end of the support column connected to one end of the foundation. The vibration mechanism comprises a high-strength spring group, a mounting shell, a plurality of groups of transmission rods, a plurality of groups of eccentric wheels, a transmission assembly and a driving mechanism arranged in the mounting shell, the high-strength spring group is arranged outside the mounting shell and connected to the support plate, and the plurality of groups of eccentric wheels are arranged in pairs and sleeved on the plurality of groups of transmission rods. The plurality of groups of transmission rods are symmetrically distributed in the same plane, and the rotating directions of any two transmission rods of the symmetric distribution are opposite. The disturbance caused by the periodic high-frequency vibration wave to the surrounding soil is small, and the soil compaction effect can be effectively reduced. The vibration type pile sinking can reduce the shear stress of the soil around the pile body, and the construction speed is significantly improved. The low disturbance feature makes the device suitable for a wider range of foundation soil.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pile sinking, in particular to a high-frequency pile sinking device and construction method suitable for low clearance. BACKGROUND

[0002] In the process of increasing the service life of a house, some problems may occur in the overall stability and safety of the house, such as uneven settlement of the foundation, damage to the foundation, etc. At this time, the foundation needs to be reinforced to improve the bearing capacity of the foundation. When the function of the house changes and needs to be added or expanded, the strength of the foundation also needs to be strengthened.

[0003] In the prior art, common techniques for processing soft foundation and reinforcing foundation include anchor pile reinforcement and grouting reinforcement. Anchor pile reinforcement often uses static pressure construction, which uses the uplift force of the anchor rod to statically press the prefabricated pile or steel pipe into the soil, thereby improving the bearing capacity of the original foundation through the pile bearing capacity, and is suitable for reinforcement of silt, silt soil, clay, silt and artificial fill foundation soil. However, anchor rod static pressure pile construction has obvious soil squeezing effect, which cannot be used in sensitive areas, and the end pile resistance is large, resulting in limited pile sinking depth. Moreover, most of the static pressure pile machines on the market are self-propelled pile drivers, which have a large volume, high use cost and inconvenient operation. In particular, when applied to the foundation reinforcement of low-rise old buildings, this type of pile machine cannot enter the construction site. Therefore, higher requirements are needed for the construction technology and equipment of anchor piles.

[0004] The traditional anchor rod static pressure pile foundation reinforcement technology has the disadvantages of obvious soil squeezing effect, low construction efficiency and limited construction machinery when applied to indoor low clearance. SUMMARY

[0005] Therefore, it is necessary to provide a high-frequency pile sinking device and construction method suitable for low clearance to solve the problems of obvious soil squeezing effect, low construction efficiency and limited construction machinery of the traditional anchor rod static pressure pile foundation.

[0006] The present application provides a high-frequency pile sinking device suitable for low clearance, comprising:

[0007] The mounting frame comprises a support column, a support plate and a connecting piece. The support plate is fixed to the opposite end of the support column connected to one end of the foundation, and the connecting piece is connected to the support plate near the side of the foundation.

[0008] The vibration mechanism comprises a high-strength spring group, a mounting shell, a plurality of sets of transmission rods, a plurality of sets of eccentric wheels, a transmission assembly and a driving mechanism, the high-strength spring group is arranged outside the mounting shell and connected with the support plate, and the plurality of sets of eccentric wheels are arranged in pairs on the plurality of sets of transmission rods. The driving mechanism drives the plurality of sets of transmission rods to rotate synchronously through the transmission assembly. The plurality of sets of transmission rods are symmetrically distributed in the same plane, and the rotation directions of any two transmission rods in the symmetric distribution are opposite.

[0009] The clamp part is connected with the plurality of sets of eccentric wheels.

[0010] The anchor rod pile is fixed to the clamp part.

[0011] According to the embodiment of the present application, the driving mechanism comprises a motor and a motor gear.

[0012] The transmission assembly comprises a first transmission assembly and a second transmission assembly.

[0013] The driving mechanism is located between two sets of transmission rods and is connected through the first transmission assembly, the first transmission assembly comprises a double gear and a steering gear, the double gear comprises a pinion gear meshing with the motor gear and a large gear meshing with the steering gear, and the steering gear is fixed to the end of the transmission rod.

[0014] The second transmission assembly comprises a plurality of sets of steering wheel groups, and the plurality of sets of steering wheel groups are respectively arranged between two adjacent transmission rods in the remaining groups to synchronously drive.

[0015] According to the embodiment of the present application, the number of the plurality of sets of transmission rods is four.

[0016] According to the embodiment of the present application, the eccentric wheel is located in the middle of the transmission rod and is fixed and limited by bearings located on both sides of the eccentric wheel.

[0017] According to the embodiment of the present application, an electric hoist is further included, the electric hoist is located on the support plate, and the connecting piece is connected to the steel wire rope of the electric hoist.

[0018] According to the embodiment of the present application, a guide rail is further included, the guide rail is sleeved on the support column, and the mounting shell is connected with the guide rail.

[0019] According to the embodiment of the present application, the clamp part comprises a clamp body, an electric hydraulic push rod and a clamp, the clamp body has a mounting hole for accommodating the anchor rod pile and a clamp hole communicating with the side surface of the mounting hole, and the clamp is arranged in the clamp hole and connected with the electric hydraulic push rod.

[0020] According to the embodiment of the present application, the clamp is detachable structure, and the clamp comprises clamps matched with different pile types.

[0021] According to the embodiment of the present application, the counterweight mechanism is a steel base or a prefabricated concrete base.

[0022] The steel base comprises a steel and a pre-buried anchor rod, and the steel is fixed to one end of the support column connected to the foundation.

[0023] The prefabricated concrete base comprises a prefabricated concrete block and a pre-buried connecting piece, and the prefabricated concrete block is fixed to one end of the support column connected to the foundation.

[0024] The present application also provides a low-clearance pile sinking construction method using the above-mentioned high-frequency pile sinking device for pile sinking construction.

[0025] The above-mentioned high-frequency pile sinking device adapted to low clearance, each set of two transmission rods symmetrically distributed rotate to drive the corresponding eccentric wheels in opposite directions, so as to form synchronous upward and downward power, and offset the respective horizontal forces, thereby forming a set of power sources. Multiple sets of transmission rods, i.e. multiple sets of power sources, synchronously superimpose to generate power. And the energy of the high-strength spring group is released when the eccentric force moves downward, further superimposes kinetic energy, so it has greater pile sinking capacity and deeper pile sinking depth. The periodic high-frequency vibration wave causes less disturbance to the surrounding soil, which can effectively reduce the soil squeezing effect. Vibration type pile sinking can reduce the shear stress of the soil around the pile body, so that the construction rate is significantly improved. The low disturbance feature makes the device suitable for a wider range of foundation soil. BRIEF DESCRIPTION OF DRAWINGS

[0026] The features, advantages, and technical effects of the exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0027] Figure 1 The structure diagram of the high-frequency pile sinking device adapted to low clearance of the embodiment of the present application;

[0028] Figure 2 The structure diagram of the internal structure of the vibration mechanism of the embodiment of the present application;

[0029] Figure 3 The structure diagram of the clamp part of the embodiment of the present application;

[0030] Figure 4 The rotation direction diagram of the embodiment of the present application;

[0031] Figure 5(a) is a partial diagram of the excitation force generated by the eccentric wheel of the embodiment of the present application in the plane;

[0032] Fig. 5(b) is a diagram showing the distribution of the exciting force generated by the eccentric wheel according to an embodiment of the present application;

[0033] Fig. 5(c) is a diagram showing the principle of generating the exciting force according to an embodiment of the present application.

[0034] 11, support column; 12, guide rail; 13, support plate; 14, electric hoist; 15, steel wire rope; 21, connecting piece; 22, high-strength spring group; 23, eccentric wheel; 24, double gear; 25, bearing; 26, transmission rod; 27, steering gear; 28, electric motor; 31, bolt connecting piece; 32, electric hydraulic push rod; 33, detachable clamp; 41, existing structure; 42, steel base; 43, pre-buried anchor rod; 44, bolt; 51, anchor rod pile. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned objects, features and advantages of the present application more apparent and comprehensible, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, a large number of specific details are set forth in order to provide a sufficient understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0036] The applicant has found that the traditional anchor rod static pressure pile foundation reinforcement technology has the following disadvantages when applied to indoor low-clearance conditions:

[0037] (1) Obvious soil squeezing effect: During the construction of the anchor rod static pressure pile, the surrounding soil is deformed and displaced due to the squeezing effect of the pile body. As the pile group becomes denser, the displacement of the soil around the pile body becomes greater, which can cause large lateral displacement and upward floating of the surrounding existing buildings, structures and pipelines. Therefore, the applicability to construction environments with dense pipelines is poor.

[0038] (2) Low construction efficiency: During the construction of the anchor rod static pressure pile, the shear stress generated by the soil around the pile body increases with the increase of the depth, and the greater the resistance of the pile body, the longer the single-pile sinking time and the certain limitation of the sinking depth.

[0039] (3) Limitation of construction machinery: The static pressure pile requires a larger power source, which results in a larger size of most sinking pile machinery, and the sinking pile machinery cannot be used for foundation reinforcement projects under low-clearance conditions.

[0040] Based on this, the application provides a high-frequency pile sinking device suitable for low clearance, which comprises a mounting frame, a vibrating mechanism, a clamp part and an anchor rod pile 51. The mounting frame comprises a support column 11, a support plate 13 and a connecting piece 21. The support plate 13 is fixed to the opposite end of the support column 11 connected to one end of a foundation, and the connecting piece 21 is connected to the support plate 13 near the side of the foundation.

[0041] The device of the application is surrounded by a support frame, i.e. a mounting frame. The support column 11 comprises two ends, one of which is connected to the foundation to serve as a fixed part, and the other end is connected to the support plate 13.

[0042] In order to ensure the fixing effect of the support column 11, or the stability of the support column 11, in some embodiments, a counterweight mechanism is further included, which is a steel base 42 or a prefabricated concrete base. The steel base 42 comprises a steel and a pre-buried anchor rod 43, and the steel is fixed to one end of the support column 11 connected to the foundation. The prefabricated concrete base comprises a prefabricated concrete block and a pre-buried connecting piece 21, and the prefabricated concrete block is fixed to one end of the support column 11 connected to the foundation.

[0043] The role of the counterweight foundation system is to ensure the stability of the entire device, which can be divided into two types: the first type adopts a steel base 42, which comprises a steel and a pre-buried anchor rod 43, and is suitable for the ground of the existing structure 41 foundation.

[0044] Exemplarily, the base of the entire device adopts a steel material, is fixed to the existing structure 41 through a pre-buried anchor rod 43, and a bolt 44 is welded on the steel base 42. For example, a bolt 44 hole is arranged at the bottom of the support column 11 to connect the steel base 42, and the upper part of the support column 11 is also connected to the support plate through a bolt 44 hole, thereby forming a support frame that can support and bear load.

[0045] The second type adopts a prefabricated concrete base, which comprises a prefabricated concrete block and a pre-buried connecting piece 21, and is suitable for poor soil such as muddy ground.

[0046] Exemplarily, when the ground is of silt soil, the counterweight system of the support frame is two prefabricated concrete blocks, and a bolt 44 is pre-buried on the prefabricated concrete block to be directly connected to the support column 11.

[0047] The vibration mechanism comprises a high-strength spring set 22, a mounting shell, a plurality of sets of transmission rods 26, a plurality of sets of eccentric wheels 23, a transmission assembly and a driving mechanism, the high-strength spring set 22 is arranged outside the mounting shell and connected with the support plate 13, and the plurality of sets of eccentric wheels 23 are arranged in pairs on the plurality of sets of transmission rods 26. The driving mechanism drives the plurality of sets of transmission rods 26 to rotate synchronously through the transmission assembly. The plurality of sets of transmission rods 26 are symmetrically distributed in the same plane, and the rotation directions of any two transmission rods 26 are opposite. The anchor rod pile 51 is fixed to the clamp part.

[0048] A plurality of holes are formed in the lower part of the connecting piece 21 and connected with the high-strength spring set 22. The high-strength spring connecting piece 21 has the advantages of: as a flexible connection, the damage of the connecting piece 21 caused by high-frequency vibration can be reduced; when the vibration pile is vibrated, the eccentric force is upward, the spring absorbs and stores energy, and when the eccentric force is downward, the spring releases energy, further superimposes kinetic energy.

[0049] In the vibration mechanism, the number of eccentric wheels 23 and transmission rods 26 is consistent, and one-to-one fixed on the transmission rod 26. The total number of transmission rods 26 is even, and all the transmission rods 26 are arranged symmetrically in the same plane; similarly, the corresponding eccentric wheels 23 on the transmission rod 26 are also symmetrically arranged.

[0050] The driving mechanism can be an electric motor or an internal combustion engine, which drives the plurality of sets of transmission rods 26 to rotate synchronously through the transmission assembly, and drives the corresponding eccentric wheels 23 to rotate. All the transmission rods 26 rotate synchronously, and the rotation directions of the two symmetric transmission rods 26 are opposite, and the rotation directions of the corresponding eccentric wheels 23 are also opposite.

[0051] In some embodiments, the number of sets of the plurality of sets of transmission rods 26 is four. Taking this as an example, the rotation of the transmission rod 26 and the eccentric wheel 23 is described.

[0052] Overall, when the eccentric wheels 23 rotate synchronously downward, a downward force is generated, and when the eccentric wheels 23 rotate synchronously upward, an upward pulling force is generated, thereby forming a periodic reciprocating motion. The four eccentric wheels 23 are arranged in the same plane, and are numbered. The No. 1 and No. 3 eccentric wheels 23 are a set of vibration sources, and the No. 2 and No. 4 eccentric wheels 23 are a set of vibration sources. After the device works, the No. 1 and No. 3 eccentric wheels 23 rotate in the XZ plane, at this time the No. 1 eccentric wheel 23 rotates clockwise, and the No. 3 eccentric wheel 23 rotates counterclockwise. The No. 2 and No. 4 eccentric wheels 23 rotate in the YZ plane, at this time the No. 4 eccentric wheel 23 rotates clockwise, and the No. 2 eccentric wheel 23 rotates counterclockwise, as shown in the figure. Figure 4Further illustrated, the four eccentric wheels 23 move synchronously, when moving upwards, a negative exciting force F- is generated, when moving horizontally, the exciting forces cancel each other as F0, and when moving downwards, an exciting force F+ is generated, as shown in Fig. 5(b), the component of the exciting force in the plane is shown in Fig. 5(a), and the anchor pile 51 is located in the middle of the plane, since each group of eccentric wheels 23 rotates relatively, the bending moment generated in the process can be cancelled out. The periodic exciting wave diagram is shown in Fig. 5(c).

[0053] The clamp part is connected to the plurality of groups of eccentric wheels 23 in linkage. The vibration mechanism is provided with a connecting plate, which is driven to move up and down by the eccentric wheels 23. The clamp part is connected and fixed with the vibration mechanism by the bolt connecting piece 31.

[0054] The above-mentioned high-frequency pile sinking device suitable for low clearance, each group of two transmission rods 26 symmetrically distributed rotate to drive the corresponding eccentric wheels 23 to rotate in opposite directions, so as to form synchronous upward and downward power, and cancel the respective horizontal forces, thereby forming a group of power sources. Multiple groups of transmission rods 26, i.e. multiple groups of power sources, synchronously superimpose to generate power. And the energy of the high-strength spring group 22 is released when the eccentric force moves downward, further superimposes kinetic energy, so it has greater pile sinking capacity and deeper pile sinking depth. The periodic high-frequency vibration wave causes less disturbance to the surrounding soil, which can effectively reduce the soil compaction effect. The vibrating pile sinking can reduce the shear stress of the soil around the pile body, so that the construction speed is significantly improved. The low disturbance feature makes the device suitable for a wider range of foundation soil.

[0055] According to the embodiment of the present application, the driving mechanism includes a motor and a motor gear. The transmission assembly includes a first transmission assembly and a second transmission assembly. The driving mechanism is located between the two groups of transmission rods 26 and is connected by the first transmission assembly, the first transmission assembly includes a double gear 24 and a steering gear 27, the double gear 24 includes a pinion gear meshing with the motor gear and a large gear meshing with the steering gear 27, and the steering gear 27 is fixed to the end of the transmission rod 26. The second transmission assembly includes a plurality of steering wheel groups, which are respectively arranged between the two adjacent transmission rods 26 of the remaining groups for synchronous transmission.

[0056] As shown in the figure, the motor is arranged inside the vibration mechanism as a power source. After the motor is connected to the power supply, the electrical energy is converted into mechanical energy, which drives the eccentric wheel 23 to rotate through the transmission mechanism. The motor gear engages with the double gear 24, the upper part of which is a pinion, and the lower part is a large gear, such as a bevel gear. The upper pinion engages with the motor gear, and the lower bevel gear engages with the steering gear 27, which is connected through the transmission rod 26 to transmit kinetic energy. The bevel gear is the same as the steering gear 27, so as to achieve synchronous rotation. This is the transmission process of the first transmission assembly, which is arranged between the two groups of transmission rods 26 in the lower left corner.

[0057] The second transmission assembly is arranged between the remaining groups of transmission rods 26. Each group of steering wheels is arranged between two transmission rods 26. The steering wheel group includes two mutually meshing steering gears 27.

[0058] The transmission assembly of the above structure is simple in structure and high in reliability.

[0059] According to the embodiment of the application, the eccentric wheel 23 is located in the middle of the transmission rod 26 and is fixed and limited by the bearings 25 located on both sides of the eccentric wheel 23.

[0060] The eccentric wheel 23 is installed in the middle of the transmission rod 26, and the bearings 25 are arranged on both sides of the eccentric wheel 23 to limit the position. The eccentric wheel 23 of this type has a stable structure and is not easy to move axially.

[0061] According to the embodiment of the application, the electric hoist 14 is also included, which is located on the support plate 13, and the connecting piece 21 is connected to the steel wire rope 15 of the electric hoist 14.

[0062] The electric hoist 14 is arranged on the upper part of the support plate, and the steel wire rope 15 is wound on the electric hoist 14, which is used to fix the bidirectional high-frequency vibration structure. After the pile sinking is completed, the lifting device can be reset. The top opening of the connecting piece 21 is fixed with the steel wire rope 15. In this way, the vibration mechanism is easy to lift.

[0063] According to the embodiment of the application, the guide rail 12 is also included, which is sleeved on the support column 11, and the mounting shell is connected with the guide rail 12.

[0064] The entire vibration system is connected with the support frame through the connecting plate and the guide rail 12, and the guide rail 12 can limit the vibration device to shake horizontally.

[0065] According to the embodiment of the application, the clamp part includes a clamp body, an electric hydraulic push rod 32, and a clamp, the clamp body has a mounting hole for the anchor rod pile 51 to be installed and a clamp hole communicating with the side surface of the mounting hole, and the clamp is arranged in the clamp hole and connected with the electric hydraulic push rod 32.

[0066] The clamp part mainly functions to lock the anchor rod pile 51, and the hydraulic feature has greater gripping force, which can prevent the anchor rod pile 51 from loosening and falling off, and comprises an electric hydraulic push rod 32, a detachable clamp 33 and a connecting piece 21.

[0067] The clamp body is provided with a hole in the middle and grooves on four sides for placing the electric hydraulic push rod 32, and the grooves are communicated with the hole in the middle, that is, the angle hole. The electric hydraulic push rod 32 takes the electric motor 28 as a power source, rotates through the electric motor 28, makes the hydraulic oil output pressure oil through the bidirectional gear pump, sends to the working oil cylinder through the oil way integration block, and realizes the reciprocating movement of the piston rod. The electric hydraulic push rod 32 has a self-locking function, and stops moving after the clamp locks the pile head. The end of the electric hydraulic push rod 32 is connected to the clamp through a bolt 44.

[0068] According to the embodiment of the application, the clamp is a detachable structure, and the clamp comprises clamps matched with different pile types.

[0069] The clamp is detachable, different clamps can be designed according to the pile type, and the detachable clamp 33 can be designed according to the cross-sectional shape of the pile, which is more flexible and convenient

[0070] The high-frequency pile sinking device suitable for low clearance has all parts in bulk, is assembled after reaching the construction site, and has a device height less than 3 m. The device has a small overall volume, and can be applied to workshops and basements with small clearance heights.

[0071] The application also provides a low-clearance pile sinking construction method, which adopts the high-frequency pile sinking device.

[0072] After the high-frequency pile sinking device is assembled, the anchor rod pile 51 is placed in the corresponding position in the device. The device is lowered by the electric winch 14, so that the pile head enters the clamp hole, and the electric hydraulic push rod 32 is turned on to fix the anchor rod pile 51. Then, the bidirectional high-frequency vibration device is turned on to sink the pile.

[0073] The above-described embodiments only express several embodiments of the application, and the description is more specific and detailed, but it cannot be understood as limiting the scope of the patent of the application. It should be noted that, for ordinary skilled persons in the art, without departing from the concept of the application, a number of modifications and improvements can be made, which all belong to the protection scope of the application. Therefore, the protection scope of the patent of the application should be subject to the appended claims.

Claims

1. A high frequency pile sinking device adapted to low clearance, characterized in that, The high-frequency pile sinking device comprises a mounting frame, a vibrating mechanism, a clamp part, an anchor rod pile, an electric hoist, a guide rail and a counterweight mechanism. The mounting frame comprises a support column, a support plate and a connecting piece. The support plate is fixed to the opposite end of the support column connected to the foundation. The connecting piece is connected to the support plate near the side of the foundation. The vibrating mechanism comprises a high-strength spring group, a mounting shell, a plurality of groups of transmission rods, a plurality of groups of eccentric wheels, a transmission assembly and a driving mechanism. The high-strength spring group is arranged outside the mounting shell and connected to the mounting shell. Each of the plurality of groups of eccentric wheels is arranged on the plurality of groups of transmission rods.

2. The high frequency pile sinking apparatus according to claim 1, characterized by The driving mechanism is driven by the transmission assembly to synchronously rotate the plurality of groups of transmission rods. The plurality of groups of transmission rods are symmetrically distributed in the same plane, and the rotation directions of any two transmission rods in the symmetric distribution are opposite. A plurality of holes are formed in the lower part of the connecting piece and connected to the high-strength spring group. The clamp part is connected and fixed to the vibrating mechanism through a bolt connecting piece.

3. A high frequency pile driver as claimed in claim 2, characterized in that The anchor rod pile is fixed to the clamp part.

4. The high frequency pile driver apparatus according to claim 2, wherein The electric hoist is arranged on the support plate, and the connecting piece is connected to the steel wire rope of the electric hoist.

5. The high frequency pile driver of claim 2, wherein The guide rail is arranged on the support column, and the mounting shell is connected to the guide rail.

6. A high frequency pile driver as claimed in claim 5, characterized in that The driving mechanism comprises a motor and a motor gear.

7. The high-frequency pile sinking apparatus according to any one of claims 1 to 6, characterized by The transmission assembly comprises a first transmission assembly and a second transmission assembly. The driving mechanism is located between two groups of transmission rods and is connected by the first transmission assembly. The first transmission assembly comprises a double gear and a steering gear.

8. A low-clearance pile sinking construction method characterized by, The double gear comprises a pinion gear meshing with the motor gear and a large gear meshing with the steering gear. The steering gear is fixed to the end of the transmission rod. The second transmission assembly comprises a plurality of groups of steering wheels. The plurality of groups of steering wheels are respectively arranged between two adjacent transmission rods of the remaining groups to synchronously drive. The number of the plurality of groups of transmission rods is four. The eccentric wheel is located in the middle of the transmission rod and is fixed and limited by the bearings on both sides of the eccentric wheel. The clamp part comprises a clamp body, an electric hydraulic push rod and a clamp. The clamp body has a mounting hole for the anchor rod pile and a clamp hole communicating with the side of the mounting hole. The clamp is arranged in the clamp hole and connected to the electric hydraulic push rod. The clamp is a detachable structure. The clamp comprises clamps matched with different pile types. The counterweight mechanism is a steel base or a prefabricated concrete base. The steel base comprises a steel and a pre-buried anchor rod. The steel is fixed to one end of the support column connected to the foundation. The prefabricated concrete base comprises a prefabricated concrete block and a pre-buried connecting piece. The prefabricated concrete block is fixed to one end of the support column connected to the foundation. The high-frequency pile sinking device is used for pile sinking construction.

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