Prestressed pipe pile drilling device for foundation pit support

Abstract

The present invention provides a prestressed pipe pile hole-guiding device for foundation pit support, which relates to the technical field of prestressed pipe piles. The prestressed pipe pile hole-guiding device for foundation pit support includes a lower support plate and an upper support plate; a first adjustment component is provided on the first rotating component, and a second drive component is provided on the first adjustment component, and the first adjustment component is used to make the second drive component reciprocate radially in the upper support plate. The first drive component on the upper support plate of the prestressed pipe pile hole-guiding device for foundation pit support provided by the present invention can rotate the first adjustment component, and the first adjustment component can move the second drive component radially. The adapter rod of the second drive component can be a drill rod, so that the drill rod can be inserted into the pipe pile and move in the pipe pile, so that the soil layer within the range where the movement of the pipe pile is blocked is cut and crushed, and the strength of the soil after crushing will be reduced, and the pipe pile can continue to sink, thereby avoiding the problem that the pipe pile cannot continue to sink due to encountering a hard soil layer.

Description

Technical Field

[0001] The invention relates to the technical field of prestressed pipe piles, in particular to a prestressed pipe pile hole guiding device for foundation pit support. Background Art

[0002] In recent years, prestressed pipe piles have been widely used in pile foundation projects. Due to the high strength of the concrete of the pipe pile body and the use of high-strength, low-relaxation prestressed steel bars, the pile body has a high effective pressure. Therefore, the pipe pile has a large bending and tensile capacity. If it can be applied to foundation pit support projects, it will be more economically competitive. The results show that prestressed reinforced concrete pipe piles have good stability and bearing capacity in deep foundation pit support projects, which can improve the overall support effect of deep foundation pit support projects and reduce the displacement deformation of the support system.

[0003] At present, the prestressed pipe piles used in foundation pit support usually need to withstand a large horizontal pressure from the soil layer. In order to ensure the stability and safety of the foundation pit, the pipe piles must be embedded in the hard soil layer below the bottom of the foundation pit to a certain depth. The pile sinking method of the prestressed pipe piles for foundation pit support generally adopts the hammer method or the static pressure method. When the pile sinking encounters a hard rock layer, especially a rock, the pipe pile will not be able to continue to enter the soil layer, resulting in the embedding depth of the foundation pit support pipe piles failing to meet the design requirements, and the safety of the foundation pit cannot be guaranteed. In order to avoid this situation, the commonly used method is to make a guide hole at the construction location of the pipe pile before the construction of the support pipe pile. The guide hole often starts from the ground, and its depth is the length of the support pile. The diameter of the guide hole is approximately equal to the diameter of the support pipe pile. After the guide hole is completed, the support pipe pile is constructed at the guide hole position.

[0004] The traditional support pipe pile drilling process has many disadvantages. First, the pipe pile drilling will cause soil damage and soil layer displacement. When drilling, the surrounding soil is subjected to vibration and impact, which can easily cause soil breakage and displacement. Especially in soft soil or loose geological conditions, the drilling process will cause the soil layer around the foundation pit to loosen and deform, thereby increasing the instability of the foundation pit.

[0005] Secondly, the drilling of support piles is often based on geological survey reports, which may not accurately reflect the geological conditions of the construction location of the support piles. If the geological survey report shows that the construction location of the support piles is a hard soil layer and requires drilling, but if the soil layer at this location is not a hard soil layer due to an error in the survey report, the piles can actually be constructed normally, then the drilling done in the early stage is unnecessary, which will not only delay the construction period, but also increase the cost of the project. More seriously, when the geological survey report shows that the soil layer at the construction location of the support piles does not require drilling, but due to an error in the survey report, the construction location encounters a hard soil layer, the support piles have been constructed to a certain depth below the ground and cannot be drilled. At this time, the constructed piles can only be pulled out or broken, and then the original piles are drilled at the construction location and the piles are re-constructed. Not only is the construction troublesome and increases unnecessary costs, but it also causes huge disturbance to the soil around the foundation pit, thereby reducing the strength of the soil, seriously affecting the stability and safety of the subsequent foundation pit excavation.

[0006] Secondly, the process of boring piles is complicated and takes a long time. Boring requires the use of large-scale machinery and equipment, and involves multiple processes, such as hole washing, hole expansion, and connection. These processes involve multiple links such as mechanical operation, material supply, and manual installation, which not only consumes a lot of time and manpower and material resources, but is also prone to delays and construction quality problems. Summary of the invention

[0007] The purpose of the present invention is to provide a prestressed pipe pile boring device for foundation pit support, so as to alleviate the technical problem that in the current pipe pile construction process, hard soil layers are encountered and pile sinking cannot be continued.

[0008] The present invention provides a prestressed pipe pile hole guiding device for foundation pit support, comprising a lower support plate and an upper support plate; the upper support plate is arranged at the upper end of the lower support plate, and a plurality of connecting ribs are arranged between the upper support plate and the lower support plate;

[0009] A first driving assembly is disposed on the upper end surface of the upper support plate, and a first rotating assembly is disposed on the lower end surface of the upper support plate, wherein the first rotating assembly is connected to a driving shaft of the first driving assembly extending to the lower end of the upper support plate;

[0010] A first adjusting assembly is arranged on the first rotating assembly, and a second driving assembly is arranged on the first adjusting assembly, wherein the first adjusting assembly is used to make the second driving assembly reciprocate in the radial direction of the upper supporting plate;

[0011] An adaptor rod is mounted on the second driving assembly, and a mounting hole is provided on the upper supporting plate.

[0012] In an optional embodiment, a circular guide rail is provided on the lower end surface of the upper support plate; and a first guide slider is provided on the circular guide rail;

[0013] The first rotating assembly comprises a rotating support plate, the first guide slider is arranged on the rotating support plate, and the rotating support plate is connected to the driving shaft of the first driving assembly, and the first driving assembly rotates the rotating support plate;

[0014] A first straight guide rail is arranged on the lower end surface of the rotating support plate, and a second guide slider is slidably arranged on the first straight guide rail;

[0015] The first adjustment assembly includes a first adjustment motor, the first adjustment motor is arranged at one end of the rotating support plate, and the first adjustment motor is provided with a first adjustment screw;

[0016] The second guide slider is arranged on the second driving assembly, and the first adjusting screw is connected to the second driving assembly, and the first adjusting screw enables the second driving assembly to move along the length direction of the rotating support plate.

[0017] In an optional embodiment, the second driving assembly includes a first driving plate, and the second guide slider is arranged on the first driving plate;

[0018] A worm gear reduction motor is arranged on the first driving plate, and the adapter rod is assembled on the worm gear reduction motor.

[0019] In an optional embodiment, a plurality of lower support assemblies are evenly arranged around the circumference of the lower support plate;

[0020] The lower support assembly includes a lower adjusting screw and an outer sleeve rod. One end of the lower adjusting screw is provided with a hinge assembly for hinged connection with the lower support plate. The outer sleeve rod is sleeved outside the lower adjusting screw and is threadedly connected to the lower adjusting screw.

[0021] In an optional embodiment, the hinge assembly includes an upper connecting member and a lower connecting member, the upper connecting member is connected to the lower support plate, and the lower connecting member is hinged to the upper connecting member; and one end of the lower adjusting screw is rotatably connected to the lower connecting member;

[0022] A driving member for driving the lower adjusting screw to rotate is arranged on the lower adjusting screw.

[0023] In an optional embodiment, it further comprises a pipe pile, the lower support plate is provided with a mounting hole, and the pipe pile is assembled in the mounting hole;

[0024] A pile tip assembly is provided at one end of the pipe pile away from the lower support plate, and the pile tip assembly includes an outer pile tip and an inner pile tip; the outer pile tip is provided on the pipe pile, a first threaded hole is provided on the outer pile tip, and the inner pile tip is screwed into the first threaded hole; a second threaded hole is provided on the inner pile tip; the adapter rod is a threaded rod, and the adapter rod can be screwed into the second threaded hole;

[0025] In an optional embodiment, a first lower tip plate is disposed on the lower end surface of the outer pile tip, a second lower tip plate is disposed on the lower end surface of the inner pile tip, and the second lower tip plate is disposed between the two first lower tip plates.

[0026] In an optional embodiment, the adapter rod is a drill rod, which includes a drill rod body, a plurality of material outlets are arranged on the drill rod body, and a conveying pipeline is arranged inside the drill rod body, and the material outlets are connected to the conveying pipeline.

[0027] In an optional embodiment, a sealing cover is provided on the material outlet.

[0028] In an optional embodiment, the lower support plate includes a plurality of splicing plates, and the plurality of splicing plates are spliced ​​together to form the lower support plate.

[0029] The first driving assembly on the upper supporting plate of the prestressed pipe pile drilling device for foundation pit support provided by the present invention can rotate the first adjusting assembly, and the first adjusting assembly can move the second driving assembly radially. The adapting rod of the second driving assembly can be a drill rod, so that the drill rod can be inserted into the pipe pile and move inside the pipe pile, so that the soil layer within the range where the movement of the pipe pile is blocked is cut and crushed, and the strength of the soil will be reduced after crushing, so that the pipe pile can continue to be sunk; thereby avoiding the problem that the pipe pile cannot continue to be sunk due to encountering a hard soil layer, thereby ensuring the safety of foundation pit construction to a greater extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 A schematic diagram of the structure of a prestressed pipe pile boring device for foundation pit support provided by an embodiment of the present invention;

[0032] Figure 2 for Figure 1 Another structural schematic diagram of the prestressed pipe pile boring device for foundation pit support shown;

[0033] Figure 3 for Figure 1 A schematic structural diagram of the connection between the upper support plate, the first adjustment assembly and the second drive assembly of the prestressed pipe pile boring device for foundation pit support shown;

[0034] Figure 4 for Figure 3 A partial enlarged view of A of the structural schematic diagram of the connection between the upper support plate, the first adjustment assembly and the second drive assembly shown;

[0035] Figure 5 for Figure 1 The schematic diagram of the structure of the pile tip assembly of the prestressed pipe pile boring device for foundation pit support shown in FIG.

[0036] Figure 6 for Figure 5 A schematic structural diagram of the pile tip assembly from another angle shown;

[0037] Figure 7 for Figure 1 The structural schematic diagram of the drill rod of the prestressed pipe pile boring device for foundation pit support shown in FIG.

[0038] Figure 8 for Figure 1 A structural schematic diagram of the connection between the lower support plate and the lower support assembly of the prestressed pipe pile boring device for foundation pit support shown;

[0039] Fig. 9 for Figure 1 The structure schematic diagram of the connection between the upper support plate of the prestressed pipe pile boring device for foundation pit support and the circular guide rail is shown.

[0040] Icon: 100-upper support plate; 200-lower support plate; 300-connecting ribs; 400-lower support assembly; 401-outer rod; 402-lower adjusting screw; 4021-driving member; 500-hinge assembly; 501-upper connecting member; 502-lower connecting member; 600-pile; 700-first driving assembly; 800-first adjusting assembly; 900-second driving assembly; 901-first driving plate; 902-worm gear reducer speed motor; 110-drill rod; 120-circular guide rail; 130-first guide slider; 140-rotating support plate; 150-first straight guide rail; 160-second guide slider; 170-first adjustment motor; 180-first adjustment screw; 190-pile tip assembly; 191-outer pile tip; 1911-first lower tip plate; 192-inner pile tip; 1921-second threaded hole; 1922-second lower tip plate; 210-assembly hole. DETAILED DESCRIPTION

[0041] The terms “first”, “second”, “third”, etc. are only used for distinguishing descriptions and do not indicate the order of arrangement, nor can they be understood as indicating or implying relative importance.

[0042] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0043] In the description of the present application, it should be noted that the terms "inside", "outside", "left", "right", "up", "down", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the products of the present application are usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0044] In the description of this application, unless otherwise clearly specified and limited, the terms "set", "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements.

[0045] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings.

[0046] Example

[0047] Reference Figure 1-Figure 9 The present invention provides a prestressed pipe pile boring device for foundation pit support, comprising a lower support plate 200 and an upper support plate 100; the upper support plate 100 is arranged at the upper end of the lower support plate 200, and a plurality of connecting ribs 300 are arranged between the upper support plate 100 and the lower support plate 200;

[0048] A first driving assembly 700 is disposed on the upper end surface of the upper support plate 100, and a first rotating assembly is disposed on the lower end surface of the upper support plate 100, wherein the first rotating assembly is connected to a driving shaft of the first driving assembly 700 extending to the lower end of the upper support plate 100;

[0049] A first adjusting assembly 800 is disposed on the first rotating assembly, and a second driving assembly 900 is disposed on the first adjusting assembly 800, wherein the first adjusting assembly 800 is used to make the second driving assembly 900 reciprocate in the radial direction of the upper supporting plate 100;

[0050] An adapting rod is mounted on the second driving assembly 900 , and an assembling hole 210 is provided on the upper supporting plate 100 .

[0051] In some embodiments, the upper support plate 100 is arranged above the lower support plate 200, and a plurality of connecting ribs 300 are arranged between the upper support plate 100 and the lower support plate 200, generally four connecting ribs 300 are arranged between the upper support plate 100 and the lower support plate 200; a first rotating component is arranged at the upper end of the upper support plate 100, and the first rotating component can be a motor, and the driving shaft of the first rotating component extends to the lower end of the upper support plate 100 and is connected to the first adjusting component 800; the first adjusting component 800 can enable the second driving component 900 to move radially.

[0052] The upper support plate 100 is circular, and the driving shaft of the first rotating component is arranged at the center of the upper support plate 100 and is connected to the first adjusting component 800, so that the first adjusting component 800 rotates along the center of the upper support plate 100; the second driving component 900 is arranged on the first adjusting component 800, and the first adjusting component 800 can make the second driving component 900 move radially in the upper support plate 100 and make the second driving component 900 rotate with the first adjusting component 800.

[0053] The second drive assembly 900 is provided with an adapter rod, which may be a threaded rod or a drill rod 110, etc. An equipment hole is provided on the upper support plate 100. When the adapter rod needs to be extended in length, the threaded rod passes through the assembly hole 210 and is connected to the threaded rod on the second drive assembly 900, thereby meeting more length requirements.

[0054] When the pipe pile 600 encounters a harder soil layer during the sinking process, the second drive assembly 900 can be connected to the drill rod 110, and the drill rod 110 can be used to break the soil layer encountered by the pipe pile 600, so that the pipe pile 600 can continue to be sunk; avoiding the problem that the pipe pile 600 cannot continue to be sunk due to encountering a hard soil layer, thereby ensuring the safety of the foundation pit construction to a greater extent.

[0055] Reference Figure 3 , Figure 4 and Fig. 9 In an optional embodiment, a circular guide rail 120 is provided on the lower end surface of the upper support plate 100; a first guide slider 130 is provided on the circular guide rail 120;

[0056] The first rotating assembly includes a rotating support plate 140, on which the first guide slider 130 is disposed, and the rotating support plate 140 is connected to the driving shaft of the first driving assembly 700, and the first driving assembly 700 causes the rotating support plate 140 to rotate;

[0057] A first straight guide rail 150 is provided on the lower end surface of the rotating support plate 140, and a second guide slider 160 is slidably provided on the first straight guide rail 150;

[0058] The first adjustment assembly 800 includes a first adjustment motor 170 , which is disposed at one end of the rotating support plate 140 , and a first adjustment screw 180 is disposed on the first adjustment motor 170 ;

[0059] The second guide slider 160 is disposed on the second driving assembly 900 , and the first adjusting screw 180 is connected to the second driving assembly 900 . The first adjusting screw 180 enables the second driving assembly 900 to move along the length direction of the rotating support plate 140 .

[0060] In some embodiments, a circular guide rail 120 is provided on the lower end surface of the upper support plate 100, and the center of the circular guide rail 120 coincides with the center of the upper support plate 100; a first guide slider 130 is slidably provided on the circular guide rail 120; one end of the rotating support plate 140 is connected to the driving shaft of the first driving assembly 700, and the other end is provided with the first guide slider 130, and the first driving assembly 700 causes the rotating support plate 140 to rotate.

[0061] Two first straight guide rails 150 are generally provided on the rotating support plate 140, and each of the first straight guide rails 150 is provided with a second guide slider 160, and the second guide slider 160 is provided on the second driving assembly 900; the first adjusting motor 170 causes the first adjusting screw 180 to rotate in forward and reverse directions, so that the second driving assembly 900 moves back and forth on the first straight guide rail 150 to adjust the position of the adapter rod.

[0062] Reference Figure 4 In an optional embodiment, the second driving assembly 900 includes a first driving plate 901, and the second guide slider 160 is disposed on the first driving plate 901;

[0063] A worm gear reduction motor 902 is disposed on the first driving plate 901 , and the adapter rod is assembled on the worm gear reduction motor 902 .

[0064] In some embodiments, two second guide sliders 160 are disposed on the first drive plate 901 of the second drive assembly 900 , and the second guide sliders 160 cooperate with the first straight guide rail 150 to enable the second drive plate to move precisely in the radial direction of the upper support plate 100 .

[0065] A worm gear reduction motor 902 is provided on the first driving plate 901, and an adapter rod is assembled on the worm gear reduction motor 902, wherein the adapter rod can be moved to the bottom of the assembly rod; when the length of the adapter rod needs to be extended, the threaded rod is inserted from the assembly hole 210 and connected to the adapter rod, thereby achieving the extension of the adapter rod.

[0066] Reference Figure 8 In an optional embodiment, a plurality of lower support assemblies 400 are evenly arranged around the circumference of the lower support plate 200;

[0067] The lower support assembly 400 includes a lower adjusting screw 402 and an outer rod 401 . One end of the lower adjusting screw 402 is provided with a hinge assembly 500 for hinged connection with the lower support plate 200 . The outer rod 401 is sleeved outside the lower adjusting screw 402 and threadedly connected to the lower adjusting screw 402 .

[0068] In an optional embodiment, the hinge assembly 500 includes an upper connecting member 501 and a lower connecting member 502, wherein the upper connecting member 501 is connected to the lower support plate 200, and the lower connecting member 502 is hinged to the upper connecting member 501; and one end of the lower adjusting screw 402 is rotatably connected to the lower connecting member 502;

[0069] A driving member 4021 for driving the lower adjusting screw 402 to rotate is disposed on the lower adjusting screw 402 .

[0070] In some embodiments, the outer rod 401 of the lower support assembly 400 is screwed on the lower adjusting screw 402, and the outer rod 401 has a pointed portion, so that the lower support assembly 400 can be inserted into the soil layer, and multiple lower support assemblies 400 cooperate to make the upper support plate 100 horizontal; the lower support assembly 400 is hinged to the lower support plate 200 through the hinge assembly 500. When adjusting the level of the upper support plate 100, the lower adjusting screw 402 is rotated by operating the driving member 4021 to adjust the length of the entire lower support assembly 400 to keep the upper support plate 100 horizontal; the upper connecting member 501 is generally a single ear, and the lower connecting member 502 is a double ear. The lower connecting member 502 has a rotating inner groove, and the lower adjusting screw 402 has a rotating protrusion, which is assembled in the rotating inner groove; in this way, the rotation matching of the lower adjusting screw 402 and the lower connecting member 502 is achieved.

[0071] Reference Figure 5 and Figure 6 In an optional embodiment, a pipe pile 600 is further included, and a mounting hole is provided on the lower support plate 200, and the pipe pile 600 is assembled in the mounting hole;

[0072] A pile tip assembly 190 is provided at one end of the pipe pile 600 away from the lower support plate 200, and the pile tip assembly 190 includes an outer pile tip 191 and an inner pile tip 192; the outer pile tip 191 is provided on the pipe pile 600, a first threaded hole is provided on the outer pile tip 191, and the inner pile tip 192 is screwed into the first threaded hole; a second threaded hole 1921 is provided on the inner pile tip 192; the adapter rod is a threaded rod, and the adapter rod can be screwed into the second threaded hole 1921.

[0073] In some embodiments, the pipe pile 600 is inserted into the installation hole of the lower support plate 200, and the pipe pile 600 is concentrically arranged with the upper support plate 100; a pile tip assembly 190 is arranged at one end of the pipe pile 600, and the pile tip assembly 190 is conducive to sinking; wherein, the outer pile tip 191 of the pile tip is fixedly arranged on the pipe pile 600, and the inner pile tip 192 is screwed into the first threaded hole of the outer pile tip 191; a second threaded hole 1921 is arranged on the inner pile tip 192; when the pipe pile 600 encounters a harder soil layer and cannot continue to sink the pile, the first adjustment assembly 800 makes the threaded rod on the second drive assembly 900 correspond to the second threaded hole 1921 and screwed into the second threaded hole 1921; then the inner pile tip 192 is driven to continue to rotate, so that the inner pile tip 192 is separated from the outer pile tip 191, that is, the inner pile tip 192 on the pipe pile 600 is removed.

[0074] The second driving assembly 900 is connected to the drill rod 110, and the drill rod 110 can be inserted into the pipe pile 600 and break up the soil around the bottom of the pipe pile 600, so that after the strength of the soil is reduced, the pipe pile 600 can continue to be sunk.

[0075] In an optional embodiment, a first lower tip plate 1911 is disposed on the lower end surface of the outer pile tip 191 , a second lower tip plate 1922 is disposed on the lower end surface of the inner pile tip 192 , and the second lower tip plate 1922 is disposed between the two first lower tip plates 1911 .

[0076] In order to make the pipe pile 600 sink better, a first lower pointed plate 1911 is provided on the outer pile tip 191, and a second lower pointed plate 1922 is provided on the inner pile tip 192; two second lower pointed plates 1922 are provided on the inner pile tip 192, and the two second lower pointed plates 1922 are vertically and intersectingly arranged. When the inner pile tip 192 is assembled on the outer pile tip 191, a second lower pointed plate 1922 is respectively provided on both sides of the second lower pointed plate 1922.

[0077] Before the construction of prestressed pipe piles 600 for foundation pit support, the construction position of the pipe piles 600 is first measured and laid out; after the pile tip assembly 190 is installed at the front end of the pipe pile 600, the pipe pile 600 construction machinery is used to construct the pipe pile 600. When the pipe pile 600 encounters a hard soil layer during the pile sinking process and cannot continue to sink, the hole-guiding device is installed on the upper part of the pipe pile 600; before the installation of the hole-guiding device, the lower support assembly 400 should be installed first. The lower support assembly 400 should be inserted into the soil layer around the construction position of the pipe pile 600 to ensure its stability. The function of the lower support assembly 400 is to reduce the impact of the vibration of the hole-guiding device when guiding the hole on the constructed pipe pile 600, so as to avoid large displacement of the pipe pile 600.

[0078] Reference Figure 7 In an optional embodiment, the adapter rod is a drill rod 110, and the drill rod 110 includes a drill rod 110 body, a plurality of material outlets are arranged on the drill rod 110 body, and a conveying pipeline is arranged in the drill rod 110 body, and the material outlets are connected to the conveying pipeline.

[0079] In an optional embodiment, a sealing cover is provided on the material outlet.

[0080] When the drill rod 110 is used to break up the harder soil layer, the first rotating assembly causes the first adjusting assembly 800 to rotate. During the rotation of the first adjusting assembly 800, the drill bit rotates along the edge of the pipe pile 600 to ensure that the soil around the bottom of the pipe pile 600 can be broken up. In this way, the strength of the soil is reduced so that the pipe pile 600 can continue to be constructed downwards.

[0081] The first adjustment component 800 adjusts the position of the second drive component 900 so that the drill rod 110 can move to the edge of the pipe pile 600; when the drill bit is crushing the soil, materials are introduced into the main body of the drill rod 110 through the conveying pipe and discharged from the material outlet. In this way, grouting reinforcement is performed simultaneously during the rotation of the drill bit. After the hole is completed, before the material has formed strength, pile sinking is carried out so that the embedding depth of the pipe pile 600 reaches the design requirement.

[0082] After the hole is drawn, when the crushed hardness around the pipe pile 600 is hardened by the slurry, the bearing capacity of the pipe pile 600 is greatly improved, thereby ensuring the safety of foundation pit development.

[0083] In an optional embodiment, the lower support plate 200 includes a plurality of splicing plates, and the plurality of splicing plates are spliced ​​together to form the lower support plate 200 .

[0084] The lower support plate 200 generally includes two splicing plates, which can be spliced ​​to form the lower support plate 200; after the lower support plate 200 is sleeved on the pipe pile 600, it is connected by the two splicing plates so that the lower support plate 200 is firmly fixed on the pipe pile 600.

[0085] The first drive assembly 700 on the upper support plate 100 of the prestressed pipe pile drilling device for foundation pit support provided by the present invention can rotate the first adjustment assembly 800, and the first adjustment assembly 800 can move the second drive assembly 900 radially. The adapter rod of the second drive assembly 900 can be a drill rod 110, so that the drill rod 110 can be inserted into the pipe pile 600 and move inside the pipe pile 600, so that the soil layer within the range where the movement of the pipe pile 600 is blocked is cut and crushed, and the strength of the soil will be reduced after crushing, so that the pipe pile 600 can continue to be sunk; avoiding the problem that the pipe pile 600 cannot continue to be sunk due to encountering a hard soil layer, thereby ensuring the safety of the foundation pit construction to a greater extent.

[0086] The prestressed pipe pile drilling device for foundation pit support provided by the present invention does not require drilling before pile sinking. When a hard soil layer is encountered during the pile sinking process of the supporting pipe pile 600 and construction cannot continue downward, drilling is performed again. The position of the drilling starts from the elevation surface of the hard soil layer, not from the ground.

[0087] The prestressed pipe pile drilling device for foundation pit support does not need to rely on the survey report. It only needs to drill holes when encountering hard soil layers and it is impossible to continue sinking piles. The prestressed pipe pile drilling device for foundation pit support can ensure that the construction length of the supporting pipe pile 600 meets the design requirements, with high construction accuracy, and effectively avoid the unfavorable situation that the pipe pile 600 is constructed into a hard rock layer and cannot drill holes and can only pull out or break the pile, thereby ensuring the safety of foundation pit construction.

[0088] The prestressed pipe pile drilling device for foundation pit support is provided with a grouting function, which can simultaneously reinforce the soil layer crushed by the drilling through grouting during the drilling process of the hard soil layer, increase the strength of the soil layer around the bottom of the supporting pile and increase the adhesion between the supporting pile body and the soil layer, thereby improving the bearing capacity of the supporting pipe pile 600 and ensuring the safety of the foundation pit.

[0089] Since the hole is drilled from the hard soil layer elevation, the soil layer below the hole surface is reinforced, so the construction of the support pipe pile 600 will not disturb the soil around the foundation pit, the strength of the soil will not be reduced, and the stability and safety of the foundation pit are further guaranteed; the foundation pit support prestressed pipe pile drilling device is not only simple to operate, but also the hole is drilled from the hard soil layer elevation, which can greatly reduce the workload of drilling, save costs, and effectively shorten the construction period.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A prestressed pipe pile drilling device for foundation pit support, characterized in that: It comprises a lower support plate (200) and an upper support plate (100); the upper support plate (100) is arranged at the upper end of the lower support plate (200), and a plurality of connecting ribs (300) are arranged between the upper support plate (100) and the lower support plate (200); A first driving assembly (700) is arranged on the upper end surface of the upper support plate (100), and a first rotating assembly is arranged on the lower end surface of the upper support plate (100), the first rotating assembly being connected to a driving shaft of the first driving assembly (700) extending to the lower end of the upper support plate (100); A first adjusting component (800) is arranged on the first rotating component, and a second driving component (900) is arranged on the first adjusting component (800), wherein the first adjusting component (800) is used to enable the second driving component (900) to reciprocate in the radial direction of the upper supporting plate (100); An adapter rod is mounted on the second drive assembly (900), and a mounting hole (210) is provided on the upper support plate (100); A circular guide rail (120) is provided on the lower end surface of the upper support plate (100); a first guide sliding block (130) is provided on the circular guide rail (120); The first rotating assembly comprises a rotating support plate (140), the rotating support plate (140) being provided with the first guide slider (130), and the rotating support plate (140) being connected to a driving shaft of the first driving assembly (700), and the first driving assembly (700) causing the rotating support plate (140) to rotate; A first straight guide rail (150) is arranged on the lower end surface of the rotating support plate (140), and a second guide sliding block (160) is slidably arranged on the first straight guide rail (150); The first adjustment component (800) comprises a first adjustment motor (170), the first adjustment motor (170) being arranged at one end of the rotating support plate (140), and the first adjustment motor (170) being provided with a first adjustment screw (180); The second guide slider (160) is disposed on the second drive assembly (900), and the first adjusting screw (180) is connected to the second drive assembly (900), and the first adjusting screw (180) enables the second drive assembly (900) to move along the length direction of the rotating support plate (140); It also includes a pipe pile (600), the lower support plate (200) is provided with a mounting hole, and the pipe pile (600) is assembled in the mounting hole.

2. The prestressed pipe pile drilling device for foundation pit support according to claim 1 is characterized in that: The second driving assembly (900) comprises a first driving plate (901), and the second guide slider (160) is arranged on the first driving plate (901); A worm gear reduction motor (902) is provided on the first driving plate (901), and the adapter rod is assembled on the worm gear reduction motor (902).

3. The prestressed pipe pile drilling device for foundation pit support according to claim 1 is characterized in that: A plurality of lower support components (400) are evenly arranged in the circumference of the lower support plate (200); The lower support assembly (400) comprises a lower adjustment screw (402) and an outer sleeve rod (401); one end of the lower adjustment screw (402) is provided with a hinge assembly (500) for hinged connection with the lower support plate (200); the outer sleeve rod (401) is sleeved outside the lower adjustment screw (402) and is threadedly connected to the lower adjustment screw (402).

4. The prestressed pipe pile drilling device for foundation pit support according to claim 3 is characterized in that: The hinge assembly (500) comprises an upper connecting member (501) and a lower connecting member (502), wherein the upper connecting member (501) is connected to the lower support plate (200), and the lower connecting member (502) is hinged to the upper connecting member (501); and one end of the lower adjusting screw rod (402) is rotatably connected to the lower connecting member (502); A driving member (4021) for driving the lower adjusting screw (402) to rotate is provided on the lower adjusting screw (402).

5. The prestressed pipe pile drilling device for foundation pit support according to claim 1 is characterized in that: A pile tip assembly (190) is arranged at one end of the pipe pile (600) away from the lower support plate (200), and the pile tip assembly (190) comprises an outer pile tip (191) and an inner pile tip (192); the outer pile tip (191) is arranged on the pipe pile (600), a first threaded hole is arranged on the outer pile tip (191), and the inner pile tip (192) is screwed into the first threaded hole; a second threaded hole (1921) is arranged on the inner pile tip (192); the adapter rod is a threaded rod, and the adapter rod can be screwed into the second threaded hole (1921).

6. The prestressed pipe pile drilling device for foundation pit support according to claim 5 is characterized in that: A first lower tip plate (1911) is arranged on the lower end surface of the outer pile tip (191), a second lower tip plate (1922) is arranged on the lower end surface of the inner pile tip (192), and the second lower tip plate (1922) is arranged between the two first lower tip plates (1911).

7. The prestressed pipe pile drilling device for foundation pit support according to claim 1 is characterized in that: The adapter rod is a drill rod (110), and the drill rod (110) comprises a drill rod (110) body, a plurality of material outlets are arranged on the drill rod (110) body, and a conveying pipeline is arranged inside the drill rod (110) body, and the material outlets are connected to the conveying pipeline.

8. The prestressed pipe pile drilling device for foundation pit support according to claim 7 is characterized in that: A sealing cover is arranged on the material outlet.

9. The prestressed pipe pile drilling device for foundation pit support according to claim 1, characterized in that: The lower support plate (200) comprises a plurality of splicing plates, and the plurality of splicing plates are spliced ​​together to form the lower support plate (200).

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