Pile foundation hole forming device for collapsible loess stratum and construction method

Abstract

The invention discloses a hole forming device for a collapsible loess stratum pile foundation and a construction method. The hole forming device comprises a drill rod main body; the drilling assembly and the transmission assembly are arranged at the end of the drill rod body. The driving telescopic assembly, the foundation part and the drill rod main body can be in synchronous rotary transmission assembly connection, and the driving telescopic assembly is provided with at least one linear telescopic kinetic energy output end part; the wall pressing cylindrical roller and the transmission assembly are arranged at the telescopic kinetic energy output end of the driving telescopic assembly. The technical problems that in the prior art, when pile foundation hole forming is conducted on the collapsible loess stratum, the hole collapse rate is high, the hole forming quality is poor, the construction efficiency is low, and the engineering economy is poor are solved.

Description

Technical Field

[0001] The invention relates to the technical field of cast-in-place pile construction, and in particular to a pile foundation hole-forming device and a construction method for collapsible loess strata. Background Art

[0002] At present, bored cast-in-place piles refer to pile bodies made by forming pile holes in the foundation soil through mechanical drilling, steel pipe squeezing or manual excavation at the construction site, placing steel cages inside and pouring concrete. The key to the success of drilling is to prevent the collapse of the hole wall. When the hole is deep, the hole wall soil below the groundwater level will collapse into the hole due to the static water pressure, and even sand flow may occur.

[0003] With the vigorous development of infrastructure projects, many bridge foundation constructions often encounter collapsible loess geological conditions. Since the soil of collapsible loess is relatively uniform, loose in structure, and well-developed in pores, it is generally strong and compressible when not wetted by water. However, when wetted by water under a certain pressure, the soil structure will be quickly destroyed, resulting in large additional sinking and rapid reduction in strength. Therefore, in the process of pile foundation construction, it is easy to produce problems such as hole collapse, poor hole quality, and low construction efficiency.

[0004] In the prior art, when rotary drilling is used for collapsible loess strata, steel casing is often used for support. However, the height of the steel casing is limited, and it cannot protect the hole wall below the casing, and the operation is relatively troublesome. Alternatively, the wall is protected by pouring cement slurry, and the drilled hole needs to be grouted throughout the length. The overall construction efficiency is low, the grouting material is large, and the engineering economy is poor. Summary of the invention

[0005] To this end, the present invention provides a pile foundation drilling device and a construction method for collapsible loess strata, so as to solve the technical problems in the prior art of pile foundation drilling in collapsible loess strata, such as high hole collapse rate, poor drilling quality, low construction efficiency and poor engineering economy.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A pile foundation hole-making device for collapsible loess strata, comprising:

[0008] Drill pipe body;

[0009] A drilling assembly, wherein the transmission assembly is arranged at the end position of the drill rod body;

[0010] A driving telescopic assembly, wherein the base part and the drill rod body are connected to each other by a synchronously rotatable transmission assembly, and the driving telescopic assembly has at least one straight telescopic kinetic energy output end;

[0011] The wall-pressing cylindrical roller and the transmission assembly are arranged at the telescopic kinetic energy output end of the driving telescopic assembly.

[0012] On the basis of the above technical solution, the present invention is further described as follows:

[0013] As a further embodiment of the present invention,

[0014] The drilling assembly includes a mounting plate, a roller drill bit and a wheel frame;

[0015] The assembly plate is transmission-fixedly assembled at the end of the drill rod body;

[0016] The wheel frames and the roller drill bits are provided in several groups, and the wheel frames in several groups are respectively fixedly connected to the bottom positions of the assembly plates, and the roller drill bits in several groups are respectively fixedly connected and assembled in a one-to-one correspondence to the wheel frames in several groups. The wheel frames cooperate with the roller drill bits to realize the function of rotating and pressing into the soil layer to drill holes.

[0017] As a further embodiment of the present invention,

[0018] The drilling assembly also includes a drilling guide plate;

[0019] The drilling guide plate is fixedly mounted on the mounting plate, and the drilling guide plate is located correspondingly at the side position of the roller drill bit, and the drilling guide plate can assist in locating the drilling position and direction.

[0020] As a further embodiment of the present invention,

[0021] The outer side transmission assembly of the drill pipe body is provided with a transmission ring seat;

[0022] A plurality of groups of driving guide seats are evenly fixedly connected to the outer side of the transmission ring seat, each group of driving guide seats is provided with a driving guide groove, and each group of driving guide seats is equipped with the driving telescopic assembly corresponding to the driving guide groove.

[0023] As a further embodiment of the present invention,

[0024] The driving telescopic assembly comprises an electric cylinder motor part and an electric cylinder body part which are fixedly assembled in the driving guide groove from the inside to the outside in sequence, the electric cylinder motor part is fixedly connected to one end of the electric cylinder body part, the electric cylinder body part is fixedly assembled in the driving guide groove, and the other end of the electric cylinder body part is transmission-assembled with an electric cylinder push rod part;

[0025] The electric cylinder push rod part is also transmission-fixedly connected with a positioning shaft frame body;

[0026] The wall-pressing cylindrical roller is vertically transfer-assembled on the positioning shaft frame body.

[0027] As a further embodiment of the present invention,

[0028] The outer side transmission assembly of the drill pipe body is provided with a synchronous ring seat;

[0029] The synchronous ring seat and the wall-pressing cylindrical roller are connected and arranged in a telescopic and adjustable distance transmission assembly.

[0030] As a further embodiment of the present invention,

[0031] The synchronous ring seats are provided in two groups, and the two groups of synchronous ring seats are respectively arranged on both sides of the transmission ring seat in a one-to-one correspondence;

[0032] A plurality of groups of synchronous guide seats are evenly fixedly connected to the outer side of the synchronous ring seat, each group of the synchronous guide seats is provided with a synchronous guide groove, and each group of the synchronous guide seats is equipped with a linkage telescopic component corresponding to the synchronous guide groove, which is driven by the driving telescopic component to synchronously telescope.

[0033] As a further embodiment of the present invention,

[0034] The linkage telescopic assembly includes a directional slider and a transmission connecting rod;

[0035] The directional slider is slidably mounted in the synchronous guide groove of the synchronous guide seat;

[0036] One end of the transmission connecting rod is fixedly mounted on the directional sliding block, and the other end of the transmission connecting rod is transmission-fixedly connected to the positioning shaft frame body.

[0037] A construction method for a pile foundation hole-forming device for collapsible loess strata comprises the following steps:

[0038] The hole wall compaction specifically includes: when the pile foundation drilling device is completely pressed into the soil layer, the driving telescopic assembly is controlled to make the wall-pressing cylindrical roller close to the hole wall, and at the same time the linkage telescopic assembly is driven by the driving telescopic assembly to synchronously extend and retract, thereby making the wall-pressing cylindrical roller rotate synchronously with the drill rod body to roll and compact the hole wall.

[0039] As a further solution of the present invention, the following steps are also included:

[0040] Construction preparation, specifically including: measuring, positioning and staking out the pile holes to be drilled, and after the measurement, positioning and staking out, moving the pile foundation drilling device to the target location;

[0041] The drilling operation specifically includes: controlling the rotation of the drill rod body so that the assembly plate drives the drilling assembly to rotate, that is, the wheel frame and the cone drill bit rotate in coordination to achieve the purpose of drilling, and the drilling assembly is pressed into the soil layer by the rotational power and static pressure until the pile foundation drilling device is completely inserted into the soil layer;

[0042] Tamp the hole wall;

[0043] The construction is finished, which specifically includes: controlling the driving telescopic assembly to return to the initial position, and after the pile foundation drilling device is moved out of the drilled pile hole, the construction is finished.

[0044] The present invention has the following beneficial effects:

[0045] The device can press the device into the soil layer through the combination of rotational power and static pressure to achieve the established drilling function, and on the basis of the drilling function, the drill rod body can simultaneously drive the wall-pressing cylindrical roller along the hole wall through the electrically controlled telescopic component to roll the hole wall, effectively realizing all-round rapid compaction of the hole wall soil. The compacted hole wall is strong and reliable, which significantly reduces the possibility of soil falling off and accumulating on the hole wall or collapse of the hole wall. The overall structure is simple, convenient and practical, which can ensure the construction progress, and the construction process does not require the installation of casing and mud wall protection processes, which saves construction costs, is more environmentally friendly, and effectively improves the overall functional practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the implementation mode of the present invention or the technical solution in the prior art, the drawings required for the implementation mode or the description of the prior art will be briefly introduced below. The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0047] Figure 1 A schematic diagram of the overall cross-sectional structure of a pile foundation drilling device for collapsible loess strata provided in an embodiment of the present invention.

[0048] Figure 2 A schematic diagram of the top view of the structure of a pile foundation drilling device for collapsible loess strata provided in an embodiment of the present invention.

[0049] Figure 3 A schematic structural diagram of the application state of a pile foundation drilling device for collapsible loess strata provided in an embodiment of the present invention.

[0050] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0051] 1-drill rod body, 2-transmission ring seat, 3-synchronous ring seat, 4-positioning shaft frame body, 5-wall pressing cylindrical roller, 6-electric cylinder motor part, 7-positioning bolt, 8-electric cylinder push rod part, 9-connecting bolt, 10-electric cylinder body part, 11-synchronous guide seat, 12-drive guide seat, 13-drive guide groove, 14-directional slide block, 15-transmission connecting rod, 16-synchronous guide groove, 17-assembly plate, 18-roller drill bit, 19-wheel frame, 20-drilling guide plate. DETAILED DESCRIPTION

[0052] The following is a description of the implementation of the present invention by specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] The terms such as "upper", "lower", "left", "right", and "middle" used in this specification are only for the convenience of description and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships should be regarded as within the scope of the invention without substantially changing the technical content.

[0054] like Figures 1 to 3 As shown, an embodiment of the present invention provides a pile foundation drilling device for collapsible loess strata, comprising a drill rod body 1 and a plurality of groups of wall-pressing cylindrical rollers 5 which are electrically controlled and telescopically driven and are arranged on the outer side of the drill rod body 1, for pressing the device into the soil layer through the combination of rotational power and static pressure to achieve a predetermined drilling function, and on the basis of the drilling function, the drill rod body 1 drives the wall-pressing cylindrical rollers 5 to roll along the hole wall through the electrically controlled telescopic assembly, effectively achieving all-round and rapid compaction of the hole wall soil, and the compacted hole wall is firm and reliable, significantly reducing the possibility of soil falling off and accumulating on the hole wall or collapse of the hole wall, and the overall structure is simple, convenient and practical, and can ensure the construction progress, and the construction process does not require the installation of casing and mud wall protection process, saving construction costs, and is more environmentally friendly. The specific settings are as follows:

[0055] Please refer to Figures 1 to 3The bottom end of the drill pipe body 1 is transmission-fixedly provided with a drilling assembly, and the drilling assembly includes an assembly plate 17 and a roller drill bit 18, a wheel frame 19 and a drilling guide plate 20 which are transmission-fixedly provided on the assembly plate 17 respectively; wherein the wheel frame 19 is provided with a plurality of groups, and a plurality of groups of the wheel frames 19 are respectively fixedly provided at the bottom position of the assembly plate 17, and a plurality of groups of the wheel frames 19 are fixedly provided with the roller drill bit 18, and the drilling guide plate 20 is fixedly provided on the assembly plate 17, so as to drive the assembly plate 17 and the wheel frame 19 and the roller drill bit 18 at the bottom of the assembly plate 17 to rotate through the drill pipe body 1, so as to realize the predetermined rotation pressing into the soil layer drilling function through the cooperation of the wheel frame 19 and the roller drill bit 18, and at the same time, the drilling guide plate 20 can be used to effectively improve the accuracy of the drilling position and direction.

[0056] The outer side of the drill pipe body 1 is respectively equipped with a transmission ring seat 2 and a synchronization ring seat 3; wherein, the synchronization ring seat 3 is provided with two groups, and the two groups of synchronization ring seats 3 are respectively arranged on both sides of the transmission ring seat 2 in a one-to-one correspondence; the outer side of the transmission ring seat 2 is evenly fixed with a plurality of drive guide seats 12, each group of the drive guide seats 12 is provided with a drive guide groove 13, and each group of the drive guide seats 12 is equipped with a drive telescopic assembly corresponding to the drive guide groove 13; the outer side of the synchronization ring seat 3 is evenly fixed with a plurality of synchronization guide seats 11, each group of the synchronization guide seats 11 is provided with a synchronization guide groove 16, and each group of the synchronization guide seats 11 is equipped with a linkage telescopic assembly driven by the drive telescopic assembly to telescopically telescope in synchronization with the synchronization guide groove 16.

[0057] Specifically, the drive telescopic assembly includes an electric cylinder motor part 6 and an electric cylinder body part 10 which are fixedly assembled in the drive guide groove 13 from the inside to the outside in sequence. The electric cylinder motor part 6 is fixedly connected to one end of the electric cylinder body part 10 by a connecting bolt 9. The electric cylinder body part 10 is fixedly assembled in the drive guide groove 13 by a positioning bolt 7. The other end of the electric cylinder body part 10 is transmission-assembled with an electric cylinder push rod part 8, which is used to utilize the electric cylinder motor part 6 and the electric cylinder body part 10 to cooperate to output linear kinetic energy to drive the electric cylinder push rod part 8 to perform telescopic action; the electric cylinder push rod part 8 also The transmission is fixedly provided with a positioning shaft frame body 4, and the wall-pressing cylindrical roller 5 is vertically transferred and assembled on the positioning shaft frame body 4, so as to synchronously drive the transmission ring seat 2, the driving telescopic component and the positioning shaft frame body 4 to rotate on the basis of completing the drilling function, thereby driving the wall-pressing cylindrical roller 5 to roll the corresponding hole wall, and realizing all-round rapid compaction of the hole wall soil. At the same time, the driving telescopic component can be used to electrically control the telescopic adjustment in real time according to the predetermined hole wall inner diameter size, or the position of the wall-pressing cylindrical roller 5 can be adaptively adjusted according to the roller pressure force, thereby making the compacted hole wall firm and reliable, and significantly reducing the probability of hole wall soil falling off and accumulating or hole wall collapse.

[0058] The linkage telescopic assembly includes a directional slider 14 and a transmission connecting rod 15; wherein, the directional slider 14 is slidably assembled in the synchronization guide groove 16 of the synchronization guide seat 11, one end of the transmission connecting rod 15 is fixedly assembled on the directional slider 14, and the other end of the transmission connecting rod 15 is transmission-fixedly connected to the positioning shaft frame body 4, so as to significantly improve the transmission performance between the drill pipe body 1 and the positioning shaft frame body 4 through the linkage telescopic assembly, thereby enhancing the overall functional stability.

[0059] The embodiment of the present invention further provides a construction method according to the above-mentioned pile foundation hole-forming device for collapsible loess strata, which specifically comprises the following steps:

[0060] S1: Construction preparation: measure and locate the pile holes to be drilled, and after measurement and positioning, move the pile foundation drilling device to the target location;

[0061] S2: Drilling operation: Control the rotation of the drill rod body 1 so that the assembly plate 17 drives the drilling assembly to rotate, that is, the wheel frame 19 and the cone drill bit 18 rotate in coordination to achieve the purpose of drilling. The drilling assembly is pressed into the soil layer by the rotational power and static pressure until the pile foundation drilling device is completely inserted into the soil layer;

[0062] S3: Hole wall compaction: When the pile foundation hole forming device is completely pressed into the soil layer, the driving telescopic assembly is controlled to make the wall pressing cylindrical roller 5 close to the hole wall, and at the same time, the linkage telescopic assembly is driven by the driving telescopic assembly to synchronously extend and retract, thereby making the wall pressing cylindrical roller 5 rotate synchronously with the drill rod body 1 to roll and compact the hole wall;

[0063] S4: Construction is completed: the telescopic assembly is controlled to return to the initial position, and the pile foundation drilling device is moved out of the drilled pile hole, and the construction is completed.

[0064] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made on the basis of the present invention. Therefore, these modifications or improvements made on the basis of not departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A pile foundation drilling device for collapsible loess strata, characterized in that: include: Drill pipe body; A drilling assembly, wherein the transmission assembly is arranged at the end position of the drill rod body; A driving telescopic assembly, wherein the base part and the drill rod body are connected to each other by a synchronously rotatable transmission assembly, and the driving telescopic assembly has at least one straight telescopic kinetic energy output end; The wall-pressing cylindrical roller and the transmission assembly are arranged at the telescopic kinetic energy output end of the driving telescopic assembly.

2. The device for drilling a hole in a pile foundation in collapsible loess stratum according to claim 1, characterized in that: The drilling assembly includes a mounting plate, a roller drill bit and a wheel frame; The assembly plate is transmission-fixedly assembled at the end of the drill rod body; The wheel frames and the roller drill bits are provided in several groups, and the wheel frames in several groups are respectively fixedly connected to the bottom positions of the assembly plates, and the roller drill bits in several groups are respectively fixedly connected and assembled in a one-to-one correspondence to the wheel frames in several groups. The wheel frames cooperate with the roller drill bits to realize the function of rotating and pressing into the soil layer to drill holes.

3. The device for drilling a hole in a pile foundation in collapsible loess stratum according to claim 2, characterized in that: The drilling assembly also includes a drilling guide plate; The drilling guide plate is fixedly mounted on the mounting plate, and the drilling guide plate is located correspondingly at the side position of the roller drill bit, and the drilling guide plate can assist in locating the drilling position and direction.

4. The device for drilling a hole in a pile foundation in collapsible loess stratum according to claim 1, characterized in that: The outer side transmission assembly of the drill pipe body is provided with a transmission ring seat; A plurality of groups of driving guide seats are evenly fixedly connected to the outer side of the transmission ring seat, each group of driving guide seats is provided with a driving guide groove, and each group of driving guide seats is equipped with the driving telescopic assembly corresponding to the driving guide groove.

5. The device for drilling a hole in a pile foundation in collapsible loess stratum according to claim 4, characterized in that: The driving telescopic assembly comprises an electric cylinder motor part and an electric cylinder body part which are fixedly assembled in the driving guide groove from the inside to the outside in sequence, the electric cylinder motor part is fixedly connected to one end of the electric cylinder body part, the electric cylinder body part is fixedly assembled in the driving guide groove, and the other end of the electric cylinder body part is transmission-assembled with an electric cylinder push rod part; The electric cylinder push rod part is also transmission-fixedly connected with a positioning shaft frame body; The wall-pressing cylindrical roller is vertically transfer-assembled on the positioning shaft frame body.

6. The device for drilling a hole in a pile foundation in collapsible loess stratum according to claim 5, characterized in that: The outer side transmission assembly of the drill pipe body is provided with a synchronous ring seat; The synchronous ring seat and the wall-pressing cylindrical roller are connected and arranged in a telescopic and adjustable distance transmission assembly.

7. The device for drilling a hole in a pile foundation in collapsible loess stratum according to claim 6, characterized in that: The synchronous ring seats are provided in two groups, and the two groups of synchronous ring seats are respectively arranged on both sides of the transmission ring seat in a one-to-one correspondence; A plurality of groups of synchronous guide seats are evenly fixedly connected to the outer side of the synchronous ring seat, each group of the synchronous guide seats is provided with a synchronous guide groove, and each group of the synchronous guide seats is equipped with a linkage telescopic component corresponding to the synchronous guide groove, which is driven by the driving telescopic component to synchronously telescope.

8. The device for drilling a hole in a pile foundation in collapsible loess stratum according to claim 7, characterized in that: The linkage telescopic assembly includes a directional slider and a transmission connecting rod; The directional slider is slidably mounted in the synchronous guide groove of the synchronous guide seat; One end of the transmission connecting rod is fixedly mounted on the directional sliding block, and the other end of the transmission connecting rod is transmission-fixedly connected to the positioning shaft frame body.

9. A construction method for a pile foundation hole-forming device for collapsible loess strata according to any one of claims 1 to 8, characterized in that: The following steps are involved: The hole wall compaction specifically includes: when the pile foundation drilling device is completely pressed into the soil layer, the driving telescopic assembly is controlled to make the wall-pressing cylindrical roller close to the hole wall, and at the same time the linkage telescopic assembly is driven by the driving telescopic assembly to synchronously extend and retract, thereby making the wall-pressing cylindrical roller rotate synchronously with the drill rod body to roll and compact the hole wall.

10. The construction method for a pile foundation hole-forming device for collapsible loess strata according to claim 9, characterized in that: The following steps are also included: Construction preparation, specifically including: measuring, positioning and staking out the pile holes to be drilled, and after the measurement, positioning and staking out, moving the pile foundation drilling device to the target location; The drilling operation specifically includes: controlling the rotation of the drill rod body so that the assembly plate drives the drilling assembly to rotate, that is, the wheel frame and the cone drill bit rotate in coordination to achieve the purpose of drilling, and the drilling assembly is pressed into the soil layer by the rotational power and static pressure until the pile foundation drilling device is completely inserted into the soil layer; Tamp the hole wall; The construction is finished, specifically including: controlling the driving telescopic assembly to return to the initial position, and after the pile foundation drilling device is moved out of the drilled pile hole, the construction is finished.

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