Variable cross-section square pile hole-forming device and construction method

Abstract

The application discloses a variable-section square pile hole-forming device and a construction method, which are used for realizing square pile hole-forming of different section sizes and improving the reuse rate of the device. The device comprises a rotary excavator, a drill rod, a circular drill cylinder, a driver, a first square pile hole-forming assembly and a second square pile hole-forming assembly. The rotary excavator is connected with the circular drill cylinder through the drill rod. The drill rod is provided with the driver. The driver is rotationally connected with the first square pile hole-forming assembly and the second square pile hole-forming assembly. The square pile hole-forming assemblies are located above the circular drill cylinder. The first square pile hole-forming assembly comprises a first telescopic rod, a first position adjuster and a first milling machine. The second square pile hole-forming assembly comprises a second telescopic rod, a second position adjuster and a second milling machine. The first side of the driver is connected with the first milling machine through the first telescopic rod. The second side of the driver is connected with the second milling machine through the second telescopic rod. The first position adjuster is installed on the first telescopic rod. The second position adjuster is installed on the second telescopic rod.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of building equipment, in particular to a variable cross-section square pile hole forming equipment and construction method. BACKGROUND

[0002] In the existing pile foundation construction, the circular pile hole is generally constructed by a rotary drilling rig. However, the construction of the square pile hole is mostly completed by manual hole digging. The manual earth digging is difficult and the daily digging depth is low, which leads to slow construction progress.

[0003] Therefore, in the construction of the square pile hole, a small part of the construction method uses mechanical equipment to dig a hole. For example, the patent document with the application number 201610017751.3-square pile hole forming method includes a square pile hole equipment and a construction method. The equipment includes a square drill bit, a square casing, and a circular drill bit. In the construction, the hole is opened and the square casing is lowered. The lower end of the square casing penetrates the fill layer and extends into the residual soil layer. The upper end extends above the ground. A circular drill bit is used to perform multiple pilot holes to form multiple circular holes. The diameter of the circular drill bit is consistent with the width of the square pile hole. The multiple circular holes are arranged in a row along the length direction of the square pile hole and are sequentially connected. The length is consistent with the length of the square pile hole. A square drill bit is used to drill from top to bottom to form a square pile hole.

[0004] However, this method of using a square pile hole equipment corresponding to one size of square pile hole not only has high equipment investment cost, but also has low reuse rate. SUMMARY

[0005] To solve the above problems, the present application provides a variable cross-section square pile hole forming equipment and construction method, which is used to realize square pile hole forming of different cross-section sizes and improve the flexibility and reuse rate of the equipment.

[0006] The first aspect of the present application provides a variable cross-section square pile hole forming equipment, which comprises:

[0007] a rotary drilling machine, a drill rod, a circular drill cylinder, a driver, a first square pile hole forming assembly, and a second square pile hole forming assembly;

[0008] The rotary drilling machine is connected with the circular drill cylinder through the drill rod. The circular drill cylinder is used to drill a circular hole. The driver is further arranged on the drill rod. The driver is rotatably connected with the first square pile hole forming assembly and the second square pile hole forming assembly. The first square pile hole forming assembly and the second square pile hole forming assembly are located above the circular drill cylinder. The first square pile hole forming assembly and the second square pile hole forming assembly are used to drill a square hole.

[0009] The first square pile hole forming assembly comprises a first telescopic rod, a first position adjuster and a first milling machine, and the second square pile hole forming assembly comprises a second telescopic rod, a second position adjuster and a second milling machine;

[0010] The first side of the driver is connected with the first milling machine through the first telescopic rod, and the second side is connected with the second milling machine through the second telescopic rod; the first milling machine and the second milling machine are symmetrically arranged with respect to the driver; the first position adjuster is mounted on the first telescopic rod, and the second position adjuster is mounted on the second telescopic rod; the driver is used for driving the first telescopic rod and the second telescopic rod to rotate, and cooperates with the first position adjuster and the second position adjuster to realize position adjustment of the first milling machine and the second milling machine, so that the first milling machine and the second milling machine perform milling work at the preset positions in the square pile hole, and the square pile hole is formed.

[0011] Optionally, the first position adjuster comprises a first angle sensor and a first length sensor;

[0012] The first angle sensor and the first length sensor are arranged on the first telescopic rod, the first angle sensor is used for measuring the angle of the first milling machine, and the first length sensor is used for measuring the length distance between the first milling machine and the driver;

[0013] The second position adjuster comprises a second angle sensor and a second length sensor;

[0014] The second angle sensor and the second length sensor are arranged on the second telescopic rod, the second angle sensor is used for measuring the angle of the second milling machine, and the second length sensor is used for measuring the length distance between the second milling machine and the driver.

[0015] Optionally, the driver is a hollow annular driver.

[0016] Optionally, the shortest length of the first square pile hole forming assembly is equal to the radius of the circular drilling cylinder, and the shortest length of the second square pile hole forming assembly is equal to the radius of the circular drilling cylinder.

[0017] Optionally, the top of the circular drilling cylinder is provided with an opening, and the inside of the circular drilling cylinder is a hollow structure, which is used for collecting the spoil produced when the first milling machine and the second milling machine perform milling work at the preset positions in the square pile hole.

[0018] Optionally, the circular drilling cylinder and the drill rod are detachably connected.

[0019] Optionally, the rotary excavator is arranged on one side of the long side of the square pile hole to be drilled.

[0020] Optionally, the drill rod is a telescopic drill rod.

[0021] Optionally, the square pile hole forming device further comprises a connecting rod; the round drill cylinder and the drill rod are connected through the connecting rod.

[0022] The second aspect of the present application provides a variable cross-section square pile hole forming construction method, comprising:

[0023] S1: adjusting the position of the round drill cylinder through the rotary excavator and the drill rod, taking the center of the square pile hole as the center of the round drill cylinder, and digging a round guide hole through the round drill cylinder;

[0024] S2: in the first direction, performing first direction milling and planing work on the square pile hole through the first milling and planing machine and the second milling and planing machine;

[0025] S3: when the earthwork milling and planing in the first direction is completed, rotating the first square pile hole forming assembly and the second square pile hole forming assembly through the driver, and controlling the first telescopic rod and the second telescopic rod to extend and retract;

[0026] S4: determining the corresponding rotation angle and telescopic length according to the length and width of the square pile hole, so as to adjust the milling and planing positions of the first milling and planing machine and the second milling and planing machine, and thereby performing second direction milling and planing work on the square pile hole through the first milling and planing machine and the second milling and planing machine, wherein the rotation angle and the telescopic length are measured and confirmed through the first position adjuster and the second position adjuster;

[0027] S5: repeating steps S3-S4 until the square pile hole milling and planing at the same height is completed;

[0028] S6: driving the first square pile hole forming assembly and the second square pile hole forming assembly to enter the next height position, and repeating steps S2-S5 until the square pile hole milling and planing is completed.

[0029] Optionally, the rotation angle α ranges from 0 to π.

[0030] The telescopic length L ranges from R to Lf, R is the radius of the round drill cylinder, L is the length of the first square pile hole forming assembly or the second square pile hole forming assembly, and Lf satisfies the following conditions:

[0031] When ,

[0032] When ,

[0033] When ,

[0034] Wherein, a is the length of the long side of the square pile hole, b is the length of the short side of the square pile hole, and Lf is the maximum length of the first square pile hole forming assembly and the second square pile hole forming assembly at the rotation angle a.

[0035] From the above technical solution, the present application has the following advantages:

[0036] The device of the present application comprises a rotary excavator, a drill rod, a circular drill cylinder, a driver, a first square pile hole forming assembly, and a second square pile hole forming assembly. The rotary excavator is connected to the circular drill cylinder through the drill rod, and the circular drill cylinder is used for drilling a circular hole. The driver is further provided on the drill rod and is rotatably connected to the first square pile hole forming assembly and the second square pile hole forming assembly. The first square pile hole forming assembly and the second square pile hole forming assembly are located above the circular drill cylinder and are used for drilling a square hole. The first square pile hole forming assembly comprises a first telescopic rod, a first position adjuster, and a first milling machine. The second square pile hole forming assembly comprises a second telescopic rod, a second position adjuster, and a second milling machine. The first side of the driver is connected to the first milling machine through the first telescopic rod, and the second side is connected to the second milling machine through the second telescopic rod. The first milling machine and the second milling machine are symmetrically arranged about the driver. The first position adjuster is installed on the first telescopic rod, and the second position adjuster is installed on the second telescopic rod. The driver is used to drive the first telescopic rod and the second telescopic rod to rotate and adjust the positions of the first milling machine and the second milling machine in cooperation with the first position adjuster and the second position adjuster, so that the first milling machine and the second milling machine can perform milling work at the preset positions in the square pile hole, and the square pile hole can be formed.

[0037] Through the square pile hole forming device, after the circular guide hole is drilled by the circular drill cylinder, the milling positions of the first milling machine and the second milling machine can be adjusted according to the size of the square pile hole. Without using a square pile hole device corresponding to a square pile hole of one size, square pile holes of different cross-sectional sizes can be formed, the equipment investment cost is reduced, and the flexibility and reusability of the equipment are improved. In addition, the mechanical equipment is used to form the square pile hole, which promotes the mechanization and popularization of the square pile hole, reduces the manual hole forming operation, and improves the safety and hole forming efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 The top view structural schematic diagram of the variable cross-section square pile hole forming device provided by the present application;

[0039] Figure 2 The C-directional sectional view structural schematic diagram of the variable cross-section square pile hole forming device provided by the present application;

[0040] Figure 3The size shortest state diagram of the first square pile hole forming assembly and the second square pile hole forming assembly in the variable cross-section square pile hole forming equipment provided in the present application;

[0041] Figure 4 The working process diagram of the first square pile hole forming assembly and the second square pile hole forming assembly in the variable cross-section square pile hole forming equipment provided in the present application. DETAILED DESCRIPTION

[0042] The present application provides a variable cross-section square pile hole forming equipment and construction method, which is used for forming square pile holes with different cross-section sizes, reduces the equipment investment cost, and improves the equipment use flexibility and reuse rate.

[0043] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "transverse", "longitudinal", and the like indicate the orientation or positional relationship shown in the drawings, and are only used to illustrate the relative positional relationship between the components or constituent parts, and do not particularly limit the specific installation orientation of the components or constituent parts.

[0044] In addition, in addition to being used to indicate the orientation or positional relationship, the above-mentioned terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. Those skilled in the art can understand the specific meaning of these terms in the present application according to the specific circumstances.

[0045] In addition, the terms "mounting", "setting", "provided with", "connection", "connected" should be broadly understood. For example, it can be fixed connection, detachable connection, or integral structure; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or constituent parts. Those skilled in the art can understand the specific meaning of the above-mentioned terms in the present application according to the specific circumstances.

[0046] In addition, the structure, proportion, size, etc. shown in the drawings in the present application are only used to cooperate with the content disclosed in the specification, so that those skilled in the art can understand and read, and do not have technical substantive significance, and any modification of the structure, change of the proportion relationship, or adjustment of the size, without affecting the effect and purpose that can be achieved by the present application, should still fall within the scope of the technical content disclosed in the present application.

[0047] Moreover, the terms "first", "second", "third", and the like, if any, used in the present application are used to distinguish similar objects, and are not necessarily used to describe a particular sequential or chronological order. It should be understood that the terms thus used can be interchanged, where appropriate, so that the embodiments described in the present application can be carried out in sequences other than those illustrated or described herein.

[0048] The technical solutions in the present application will be described clearly and completely below in combination with the drawings in the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0049] Please refer to Figures 1 to 4 The variable cross-section square pile hole-forming device provided by the present application comprises:

[0050] The rotary excavator 100, the drill rod 9, the circular drill cylinder 6, the driver 1, the first square pile hole-forming assembly 300, and the second square pile hole-forming assembly 200; the rotary excavator 100 is connected with the circular drill cylinder 6 through the drill rod 9, and the circular drill cylinder 6 is used for drilling a round hole 11; the driver 1 is further arranged on the drill rod 9, and the driver 1 is rotatably connected with the first square pile hole-forming assembly 300 and the second square pile hole-forming assembly 200 respectively, and the first square pile hole-forming assembly 300 and the second square pile hole-forming assembly 200 are located above the circular drill cylinder 6, and the first square pile hole-forming assembly 300 and the second square pile hole-forming assembly 200 are used for drilling a square hole 10; the first square pile hole-forming assembly 300 comprises a first telescopic rod 31, a first position adjuster, and a first milling machine 51, and the second square pile hole-forming assembly 200 comprises a second telescopic rod 32, a second position adjuster, and a second milling machine 52; a first side of the driver 1 is connected with the first milling machine 51 through the first telescopic rod 31, and a second side of the driver 1 is connected with the second milling machine 52 through the second telescopic rod 32; the first milling machine 51 and the second milling machine 52 are symmetrically arranged about the driver 1; the first position adjuster is installed on the first telescopic rod 31, and the second position adjuster is installed on the second telescopic rod 32; the driver 1 is used for driving the first telescopic rod 31 and the second telescopic rod 32 to rotate, and cooperates with the first position adjuster and the second position adjuster to realize position adjustment of the first milling machine 51 and the second milling machine 52, so that the first milling machine 51 and the second milling machine 52 perform milling work at a preset position in the square pile hole, and square pile hole-forming is realized.

[0051] The rotary excavator 100 is a construction machine for hole forming in foundation engineering, and its structure and construction principle are prior art. The rotary excavator 100 in the drawing is marked as an example, and will not be described in detail. The rotary excavator 100 is provided with a drill rod 9, which can be a telescopic drill rod 9 to adjust the lifting height of the circular drill barrel 6 and the first square pile hole forming assembly 300 and the second square pile hole forming assembly 200. The drill rod 9 is connected below the circular drill barrel 6, which is used to drill a circular hole 11. A driver 1 is installed on the drill rod 9 at the upper part of the circular drill barrel 6, and the driver 1 is connected to the first square pile hole forming assembly 300 and the second square pile hole forming assembly 200, so that the first milling machine 51 and the second milling machine 52 provided on the first square pile hole forming assembly 300 and the second square pile hole forming assembly 200 are used to mill away the earthwork between the circular hole 11 and the square hole 10, so as to achieve the purpose of square pile hole forming.

[0052] The driver 1 can be a hollow annular driver 1 to facilitate the installation of the first square pile hole forming assembly 300 and the second square pile hole forming assembly 200 on the driver 1. It should be noted that the driver 1 can also be other shapes, and the driver 1 can be a generator, a driving cylinder or other driving equipment with driving force, which is not limited here.

[0053] Specifically, the first square pile hole forming assembly 300 and the second square pile hole forming assembly 200 are connected with the drill rod 9 through the hollow annular driver 1, and the hollow annular driver 1 drives the first square pile hole forming assembly 300 and the second square pile hole forming assembly 200 to rotate. At the same time of rotation, the first telescopic rod 31 and the second telescopic rod 32 can realize the function of coming and going. The first telescopic rod 31 and the second telescopic rod 32 act as mechanical arms of the first milling machine 51 and the second milling machine 52, and can drive the first milling machine 51 and the second milling machine 52 to mill away the earthwork of the current work line (for example, the OA work line). The first position adjuster and the second position adjuster are used to confirm the specific position of the first milling machine 51 and the second milling machine 52 in the square hole 10, so as to ensure the accuracy of the milling position of the first milling machine 51 and the second milling machine 52, and ensure that the milled pile hole is a square hole 10. Then, under the driving force of the hollow annular driver 1, the first square pile hole forming assembly 300 and the second square pile hole forming assembly 200 rotate to the next work line (for example, the OB work line) for milling operation. In this way, the earthwork between the circular hole 11 and the square hole 10 with a predetermined cross-sectional size is milled away.

[0054] In this embodiment, after the circular pilot hole 11 is drilled by the circular drill barrel 6, the milling positions of the first milling machine 51 and the second milling machine 52 can be adjusted according to the size of the square pile hole 10, without the need to use a square pile hole device corresponding to one size of the square pile hole, so that square pile holes with different cross-sectional sizes can be formed, the equipment investment cost is reduced, and the equipment use flexibility and reusability are improved. In addition, the formation of the square pile hole by the mechanical equipment also promotes the mechanization and popularization of the square pile hole, reduces the manual hole formation operation, and improves the safety and hole formation efficiency.

[0055] Optionally, the first position adjuster includes a first angle sensor 21 and a first length sensor 41; the first angle sensor 21 and the first length sensor 41 are both arranged on the first telescopic rod 31, the first angle sensor 21 is used to measure the angle of the first milling machine 51, and the first length sensor 41 is used to measure the length distance between the first milling machine 51 and the driver 1; the second position adjuster includes a second angle sensor 22 and a second length sensor 42; the second angle sensor 22 and the second length sensor 42 are arranged on the second telescopic rod 32, the second angle sensor 22 is used to measure the angle of the second milling machine 52, and the second length sensor 42 is used to measure the length distance between the second milling machine 52 and the driver 1.

[0056] In this embodiment, because the first milling machine 51 and the second milling machine 52 are affected by the hollow ring-shaped driver 1, the first telescopic rod 31 and the second telescopic rod 32 to make rotational and telescopic motion superposition. Therefore, the rotational angle and the telescopic length of the first milling machine 51 and the second milling machine 52 can be controlled by the hollow ring-shaped driver 1, the first telescopic rod 31 and the second telescopic rod 32 based on the cross-sectional size of the square hole 10, so as to determine the corresponding milling position to adapt to the cross-sectional size position of the square hole 10 for milling. Specifically, the program module can be used to control the motion trajectory of the first milling machine 51 and the second milling machine 52 according to the rotational angle and the telescopic length. The rotational angle is measured by the angle sensor, and the rotational angle is the rotational angle of the milling machine from the current working line to the next working line. The telescopic length is measured by the length sensor, and the telescopic length is the instantaneous length from the center of the driver 1 to the farthest end of the milling machine, or the instantaneous length of the first square pile hole forming assembly 300 or the instantaneous length of the second square pile hole forming assembly 200. Specifically, the first angle sensor 21 measures the rotational angle of the first milling machine 51, and the first length sensor 41 measures the instantaneous length from the driver 1 to the farthest end of the first milling machine 51. The second angle sensor 22 measures the rotational angle of the second milling machine 52, and the second length sensor 42 measures the instantaneous length from the driver 1 to the second milling machine 52.

[0057] Optionally, the shortest length of the first square pile hole forming assembly 300 is equal to the radius of the circular drilling cylinder 6, and the shortest length of the second square pile hole forming assembly 200 is equal to the radius of the circular drilling cylinder 6. Thus, when the circular drilling cylinder 6 is drilling the circular hole 11, and the first square pile hole forming assembly 300 and the second square pile hole forming assembly 200 are not working and are in a static state, the interference of the first square pile hole forming assembly 300 and the second square pile hole forming assembly 200 on the working of the circular drilling cylinder 6 can be reduced, and the construction efficiency can be improved.

[0058] Optionally, the top of the circular drilling cylinder 6 is provided with an opening 8, and the inside of the circular drilling cylinder 6 is a hollow structure, which is used to collect the spoil produced when the first milling machine 51 and the second milling machine 52 are milling at the preset position in the square pile hole.

[0059] In this embodiment, during the milling process of the first milling machine 51 and the second milling machine 52, the soil and rock between the circular hole 11 and the square hole 10 will fall down due to gravity. Therefore, the opening 8 is arranged at the top of the circular drilling cylinder 6, and the falling soil and rock can fall into the circular drilling cylinder 6 through the opening 8, so that the waste soil and rock is lifted to the outside of the hole pile through the circular drilling cylinder 6, and the soil removal efficiency is improved.

[0060] Optionally, the square pile hole forming equipment further comprises a connecting rod 7; the circular drilling cylinder 6 and the drill rod 9 are connected through the connecting rod 7.

[0061] In this embodiment, the circular drilling cylinder 6 and the drill rod 9 are connected through several connecting rods 7. Since the connecting rod 7 is rod-shaped, the position of the opening 8 at the top of the circular drilling cylinder 6 can be reserved as much as possible, and the soil loading efficiency inside the circular drilling cylinder 6 is improved.

[0062] Optionally, the circular drilling cylinder 6 and the drill rod 9 are detachably connected.

[0063] In this embodiment, when the hole pile excavation depth approaches the preset design depth, since the bottom of the circular drilling cylinder 6 will first reach the ground at the design depth, the circular drilling cylinder 6 and the drill rod 9 are designed to be detachably connected. Thus, when there is a requirement for the bottom bearing capacity of the square hole 10 or other reasons require that over-excavation is strictly prohibited after drilling to the design depth, the circular drilling cylinder 6 can be removed after the bottom of the circular drilling cylinder 6 reaches the design depth, and then the milling of the square hole 10 is performed by the first milling machine 51 and the second milling machine 52. Further, if the square hole 10 only has a requirement for lateral bearing capacity or other reasons allow over-excavation when drilling to the design elevation, the circular drilling cylinder 6 can not be removed, and the drilling is stopped after the first milling machine 51 and the second milling machine 52 mill to the design elevation. The over-excavation part, which is the circular hole 11 part over-excavated by the circular drilling cylinder 6, can be filled with concrete or other materials.

[0064] Optionally, the rotary excavator 100 is arranged at one long side of the square pile hole 10 to be drilled to improve construction safety and allow the rotary excavator 100 to work better.

[0065] The variable-section square pile hole forming device provided by the application is described above, and the variable-section square pile hole forming construction method provided by the application is described below based on the square pile hole forming device described above.

[0066] The variable-section square pile hole forming construction method provided by the application comprises the following steps:

[0067] S1: Adjusting the position of the circular drill barrel 6 by the rotary excavator 100 and the drill rod 9, taking the center of the square pile hole 10 as the center of the circular drill barrel 6, and drilling a circular pilot hole by the circular drill barrel 6;

[0068] S2: In the first direction, performing first direction milling and planing work on the square pile hole 10 by the first milling and planing machine 51 and the second milling and planing machine 52;

[0069] S3: When the earthwork milling and planing in the first direction is completed, rotating the first square pile hole forming assembly 300 and the second square pile hole forming assembly 200 by the driver 1, and controlling the first telescopic rod 31 and the second telescopic rod 32 to extend and retract;

[0070] S4: Determining the corresponding rotation angle and telescopic length according to the length and width of the square pile hole 10 to adjust the milling and planing positions of the first milling and planing machine 51 and the second milling and planing machine 52, so as to perform second direction milling and planing work on the square pile hole 10 by the first milling and planing machine 51 and the second milling and planing machine 52, wherein the rotation angle and the telescopic length are measured and confirmed by the first position adjuster and the second position adjuster;

[0071] S5: Repeating steps S3-S4 until the square pile hole 10 at the same height is completed;

[0072] S6: Driving the first square pile hole forming assembly 300 and the second square pile hole forming assembly 200 to the next height position, and repeating steps S2-S5 until the square pile hole 10 is completed.

[0073] In step S1, after the square hole 10 position is determined by the line laying before construction, the center of the square hole 10 is taken as the center of the circular drill barrel 6, and the circular hole 11 is drilled by the circular drill barrel 6, wherein the center of the driver 1 is also located at the center position of the square hole 10. It should be noted that when the circular hole 11 is drilled, the first square pile hole forming assembly 300 and the second square pile hole forming assembly 200 should be contracted to the shortest length L0 (see Figure 3) and in a static state, the shortest length L0 can be set equal to the radius R of the circular drill barrel 6 or the shortest length L0 is less than the radius R to reduce the working interference of the first square pile hole forming assembly 300 and the second square pile hole forming assembly 200 when drilling the circular hole 11 in the circular drill barrel 6.

[0074] In step S2, after the circular drill barrel 6 drills into the circular hole 11 to a certain depth, the circular drill barrel 6 and the drill rod 9 are kept stationary in the hole, and the first square pile hole forming assembly 300 and the second square pile hole forming assembly 200 start to work. At this time, the driver 1 drives the first square pile hole forming assembly 300 and the second square pile hole forming assembly 200 to rotate, and at the same time, the first telescopic rod 31 and the second telescopic rod 32 are extended and retracted to drive the first milling machine 51 and the second milling machine 52 to mill the earth and rock in the first direction of the working line.

[0075] In steps S3-S5, under the action of the driver 1, after the first square pile hole forming assembly 300 and the second square pile hole forming assembly 200 complete the working line in the first direction, the first square pile hole forming assembly 300 and the second square pile hole forming assembly 200 are turned to the next working line for work, and so on, until the first milling machine 51 and the second milling machine 52 mill all the earth and rock between the circular hole 11 and the square hole 10. Further, because the first milling machine 51 and the second milling machine 52 mainly perform rotational and telescopic motion during the work under the action of the driver 1 and the first telescopic rod 31 and the second telescopic rod 32. Therefore, in order to make the final milled area of the first milling machine 51 and the second milling machine 52 into a square hole, the motion trajectory of the farthest end of the first square pile hole forming assembly 300 and the second square pile hole forming assembly 200 can be controlled by a program module, that is, the rotation angle of the first square pile hole forming assembly 300 and the second square pile hole forming assembly 200 and the telescopic length changing with the rotation angle are controlled, and the milling work is performed under the rotation angle and the telescopic length. Specifically, please refer to Figure 4 , if the long side length of the square hole 10 is a and the short side length is b, the OA working line is the initial position of the first square pile hole forming assembly 300, and the first square pile hole forming assembly 300 is preset to rotate clockwise during work. That is, first, the milling work is performed under the OA working line, and after the working line is milled, the first square pile hole forming assembly 300 is rotated by an angle α, and the first square pile hole forming assembly 300 is correspondingly telescoped by a certain instantaneous length according to the rotation angle α and the cross-sectional size of the square hole 10 to determine the specific telescopic length, wherein the rotation angle α ranges from 0 to π, and the instantaneous length L of the first square pile hole forming assembly 300 and the second square pile hole forming assembly 200 satisfies the following condition:

[0076] R = L0≤ L≤ Lf, wherein R is the radius of the circular drill barrel 6, and Lf satisfies the following condition:

[0077] When ,

[0078] When ,

[0079] When ,

[0080] Wherein, a is the length of the long side of the square pile hole 10, b is the length of the short side of the square pile hole 10, and Lf is the maximum length of the first square pile hole forming assembly 300 and the second square pile hole forming assembly 200 at the rotation angle α.

[0081] Then, based on the rotation angle and the telescopic length, the milling work of the strip operation line is carried out, and so on. When the rotation angle α is equal to π, or in other words, after the first square pile hole forming assembly 300 rotates 180° based on the initial position, the soil and rock in the same height range has been milled and worked by the milling work of the first square pile hole forming assembly 300 and the second square pile hole forming assembly 200, so that the next height can be entered for work. It should be noted that the rotation angle α can be measured by an angle sensor and transmitted to the program module, and the instantaneous length L can be measured by a length sensor and transmitted to the program module, and the program module further determines the rotation angle and the telescopic length of the first square pile hole forming assembly 300 and the second square pile hole forming assembly 200 by the transmission of the rotation angle α and the instantaneous length L.

[0082] In step S6, when the rotation angle α is equal to π, the soil and rock milling work of the square pile hole 10 in the same height range is completed. Then the first square pile hole forming assembly 300 and the second square pile hole forming assembly 200 can be controlled to shrink to the length L0, and then counterclockwise to the initial position OA operation line direction, and then controlled to move down to the next height operation surface by the drill rod 9 to repeat steps S2-S5 for milling work. Wherein, the rotation angle is set to 0≤α<π, which can return to the initial position for milling work at the next height position after completing the milling at the same height, which can effectively reduce the line sending winding failure of the first telescopic rod 31, the second telescopic rod 32, the first milling machine 51 and the second milling machine 52.

[0083] Thus, in the embodiment, the square pile hole forming device and the construction method can realize the square pile hole forming in the preset range with different cross sections, and the relationship between the different cross section sizes and the first square pile hole forming assembly 300 and the second square pile hole forming assembly 200 is as follows:

[0084]

[0085] Wherein, a is the length of the long side of the square pile hole 10, b is the length of the short side of the square pile hole 10, and Lf is the maximum length of the first square pile hole forming assembly 300 and the second square pile hole forming assembly 200 at the rotation angle α.

[0086] In the embodiment, the square pile hole forming device and the construction method realize hole forming of square piles with different sections, reduce the equipment investment cost, improve the equipment use flexibility and the reuse rate, promote the mechanization and popularization rate of square pile hole, reduce the manual hole forming operation, and improve the safety and hole forming efficiency.

[0087] It should be noted that the square pile hole forming device disclosed in the present application can not only realize the excavation of earthwork and earth-rock, but also realize the excavation of part of the rock. The specific excavation object is not limited here.

[0088] It should be noted that the above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A variable cross-section square pile hole forming apparatus, characterized by, The square pile hole forming device comprises a rotary excavator, a drill rod, a circular drill barrel, a driver, a first square pile hole forming assembly and a second square pile hole forming assembly. The rotary excavator is connected with the circular drill barrel through the drill rod, and the circular drill barrel is used for drilling a circular hole. The first square pile hole forming assembly comprises a first telescopic rod, a first position adjuster and a first milling machine, and the second square pile hole forming assembly comprises a second telescopic rod, a second position adjuster and a second milling machine. The first side of the driver is connected with the first milling machine through the first telescopic rod, and the second side is connected with the second milling machine through the second telescopic rod. The first position adjuster is installed on the first telescopic rod, and the second position adjuster is installed on the second telescopic rod. The first angle sensor and the first length sensor are arranged on the first telescopic rod. The second position adjuster comprises a second angle sensor and a second length sensor.

2. A socket-forming apparatus according to claim 1, wherein The second angle sensor and the second length sensor are arranged on the second telescopic rod.

3. A caisson hole forming apparatus according to claim 1, wherein The driver is a hollow annular driver.

4. A pile socketting apparatus according to any one of claims 1 to 3, wherein, The shortest length of the first square pile hole forming assembly is equal to the radius of the circular drill barrel.

5. A pile socketting apparatus according to any one of claims 1 to 3, wherein, The top of the circular drill barrel is provided with an opening, and the inside of the circular drill barrel is a hollow structure for collecting the spoil produced when the first milling machine and the second milling machine perform milling work at the preset positions in the square pile hole through the opening.

6. A pile hole forming apparatus according to any one of claims 1 to 3, characterized in that, The circular drill barrel and the drill rod are detachably connected.

7. A variable cross-section square pile hole-forming construction method, characterized by, The rotary excavator is arranged on one side of the long side of the square pile hole to be drilled. The drill rod is a telescopic drill rod. The square pile hole forming method uses the square pile hole forming device of any one of claims 1 to 6 to form a square pile hole, and the square pile hole forming method comprises: S1: adjusting the position of the circular drill cylinder by the rotary excavator and drill rod, taking the center of the square pile hole as the center of the circular drill cylinder, and digging a circular pilot hole through the circular drill cylinder; S2: in the first direction, performing first direction milling work on the square pile hole by the first milling machine and the second milling machine; S3: when the earthwork milling in the first direction is completed, rotating the first square pile hole forming assembly and the second square pile hole forming assembly by the driver, and controlling the first telescopic rod and the second telescopic rod to extend and retract; S4: determining the corresponding rotation angle and telescopic length according to the length and width of the square pile hole, so as to adjust the milling position of the first milling machine and the second milling machine, and thereby performing second direction milling work on the square pile hole by the first milling machine and the second milling machine, wherein the rotation angle and the telescopic length are measured and confirmed by the first position adjuster and the second position adjuster; S5: repeating steps S3-S4 until the square pile hole milling at the same height is completed; S6: driving the first square pile hole forming assembly and the second square pile hole forming assembly to the next height position, and repeating steps S2-S5 until the square pile hole milling is completed.

8. The method according to claim 7, wherein, The rotation angle α ranges from 0 to π; The telescopic length L ranges from R to Lf, R is the radius of the circular drill cylinder, L is the length of the first square pile hole forming assembly or the second square pile hole forming assembly, and Lf satisfies the following condition: Wherein, a is the long side length of the square pile hole, b is the short side length of the square pile hole, and Lf is the maximum length of the first square pile hole forming assembly and the second square pile hole forming assembly when the rotation angle α.

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