A kind of anti-collapse casing structure for the construction of grouting pile foundation in the alluvial plain of the Yellow River

Abstract

The present invention discloses an anti-collapse hole casing structure for use in the construction of a grouting pile foundation on the alluvial plain of the Yellow River, belonging to the technical field of grouting pile foundation construction. The anti-collapse hole casing structure for use in the construction of a grouting pile foundation on the alluvial plain of the Yellow River comprises a bottom inner tube assembly, a plurality of connecting inner tube assemblies are provided on the top of the bottom inner tube assembly, a bottom outer tube assembly and a connecting outer tube assembly are respectively provided on the outer walls of the plurality of connecting inner tube assemblies, and a plurality of casing connection mechanisms are installed between the bottom inner tube assembly and the plurality of connecting inner tube assemblies, and between the bottom outer tube assembly and the connecting outer tube assembly. The present invention increases the number of connecting inner tube assemblies and connecting outer tube assemblies that can be installed by designing the bottom outer tube assembly and the connecting outer tube assembly, and increases the installation efficiency of the casing by designing the depth of the plurality of connecting inner tube assemblies and the bottom inner tube assembly. During the deepening of the plurality of connecting inner tube assemblies and the bottom inner tube assembly, the entire inner tube only needs to overcome soil friction below the outer tube, thereby improving the efficiency of casing installation.

Description

Technical Field

[0001] The invention belongs to the technical field of cast-in-place pile foundation construction, and in particular relates to an anti-collapse hole casing structure for cast-in-place pile foundation construction in the alluvial plain of the Yellow River. Background Art

[0002] The Yellow River Alluvial Plain is formed by the silt deposition of the Yellow River and is an important part of the North China Plain. It has a low terrain and the soil is mainly silt, sand and silt. It has high fertility but loose structure and is prone to salinization. The river network is dense and irrigation is convenient, but it also faces problems such as floods and foundation settlement. Due to the soil characteristics of the Yellow River Alluvial Plain, the depth of cast-in-place pile foundations is usually deeper than other lands. Because the soil layer here is mainly loose silt and sand, with low bearing capacity and high compressibility, the shallow part is difficult to serve as a bearing layer. The pile foundation needs to penetrate the deep and weak layer and reach the deep solid bearing layer to ensure bearing capacity and control settlement. Therefore, the depth is generally greater. Therefore, during the construction process, deeper casing is often required to achieve sealing. At the same time, it is also necessary to pay attention to the fact that the casing should be buried deeply and sealed to prevent collapse and water seepage. Layered drilling should be adopted to control the speed to prevent disturbance of soft soil. The hole should be cleaned thoroughly to avoid problems such as excessive sediment.

[0003] The existing anti-collapse hole casing structure is often drilled in layers during the construction of deeper pile foundations, and the drilling operation is carried out while the casing is spliced. This results in the casing being too long deep into the ground, and the friction force generated by the soil extrusion faced by the entire casing is too large. Both the casing is deeply embedded in the ground in the later stage and the subsequent pulling out of the casing as a whole is very laborious. At the same time, with regard to the connection method between the casings, the existing method is to achieve connection through a circular threaded block. This method requires the threaded holes on the casing to be carefully cleaned before construction, which is a large workload. At the same time, it is more laborious to rotate the circular threaded block when the casing is subsequently installed. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the disadvantages of the above-mentioned prior art and provide an anti-collapse hole casing structure for cast-in-place pile foundation construction in the alluvial plain of the Yellow River.

[0005] The technical solution adopted to solve the above technical problems is: to provide an anti-collapse casing structure for cast-in-place pile foundation construction in the alluvial plain of the Yellow River, comprising a bottom inner cylinder assembly, a plurality of connecting inner cylinder assemblies arranged on the top of the bottom inner cylinder assembly, and a bottom outer cylinder assembly and a connecting outer cylinder assembly respectively arranged on the outer walls of the plurality of connecting inner cylinder assemblies;

[0006] A plurality of casing connection mechanisms are installed between the bottom inner cylinder assembly and the plurality of connecting inner cylinder assemblies, and between the bottom outer cylinder assembly and the connecting outer cylinder assembly. A connecting drive plate assembly is provided on the top of the plurality of connecting inner cylinder assemblies.

[0007] The top of the connecting drive plate assembly is fixedly connected with a protective shell, and a plurality of sets of casing limiting and fixing mechanisms are slidably connected to the connecting drive plate assembly, and a transmission mechanism is provided between the tops of the plurality of sets of casing limiting and fixing mechanisms.

[0008] Furthermore, the bottom inner tube assembly includes a bottom inner casing, the bottom of the bottom inner casing is fixedly connected to a plurality of first teeth, and the top of the bottom inner casing is fixedly connected to a first sleeve inner shell.

[0009] Through the above technical solution, the bottom inner casing can be quickly inserted into the soil by rotating back and forth through the multiple first teeth when pressed down, and the connection with the inner tube assembly can be achieved through the first sleeve inner shell.

[0010] Furthermore, the connecting inner tube assembly includes a connecting inner casing, the bottom of the connecting inner casing is fixedly connected to the first sleeve outer shell, and the top of the connecting inner casing is fixedly connected to the second sleeve inner shell.

[0011] Through the above technical solution, the first sleeve outer shell and the second sleeve inner shell can be connected to the bottom inner tube assembly and other connecting inner tube assemblies, thereby realizing splicing of the casing.

[0012] Furthermore, the bottom outer tube assembly includes a bottom outer protective tube, the bottom of the bottom outer protective tube is fixedly connected to a plurality of second teeth, and the top of the bottom outer protective tube is fixedly connected to a third sleeve inner shell.

[0013] With the above technical solution, the bottom outer casing can be quickly inserted into the soil by rotating back and forth when pressing down through the plurality of second teeth.

[0014] Furthermore, the connecting outer tube assembly includes a connecting outer protective tube, the bottom of the connecting outer protective tube is fixedly connected to the second sleeve outer shell, and the top of the connecting outer protective tube is fixedly connected to the fourth sleeve inner shell.

[0015] Through the above technical solution, the second sleeve outer shell and the fourth sleeve inner shell can be connected to the bottom outer cylinder assembly and other connecting outer cylinder assemblies.

[0016] Furthermore, the first sleeve inner shell, the first sleeve outer shell, the second sleeve inner shell, the third sleeve inner shell, the second sleeve outer shell and the fourth sleeve inner shell are each provided with a plurality of circular holes corresponding to the casing connection mechanism, and the bottoms of the first sleeve outer shell and the second sleeve outer shell are each provided with a guide groove, and the length of the bottom inner casing is greater than the length of the bottom outer casing.

[0017] Through the above technical solution, the splicing function between the casings can be realized through the corresponding circular holes and the casing connection mechanism, and the positioning function of the circular holes can be realized through the guide grooves and the corresponding guide bars, which facilitates the installation of the subsequent casing connection mechanism and ensures that the bottom inner tube assembly and the bottom outer tube assembly can be lowered together at the beginning.

[0018] Furthermore, the casing connection mechanism includes a connecting block, a fixed threaded sleeve is fixedly connected to one side of the inner wall of the connecting block, a threaded double-layer sleeve is spirally connected to the fixed threaded sleeve, an integrated cavity conical sleeve is fixedly connected to one side of the outer wall of the threaded double-layer sleeve, and a plurality of ejection blocks are slidably connected to the inside of the connecting block, and the bottoms of both sides of the plurality of ejection blocks are fixedly connected to limiting blocks.

[0019] Through the above technical solution, the first sleeve outer shell is sleeved on the outer wall of the first sleeve inner shell, thereby completing the sleeve connection between the bottom inner cylinder assembly and the connecting inner cylinder assembly, and then positioning is performed through the groove and guide bar of the first sleeve outer shell, so that the circular holes of the two are aligned, and the casing connection mechanism is directly inserted into the two fitting circular holes, and then through Figure 17 The T-rod in the sleeve is inserted into the rectangular through-hole in the threaded double-layer sleeve, and then rotated. The threaded double-layer sleeve is spirally connected with the fixed threaded sleeve to rotate into the interior of the connecting block. At this time, the inclined surface structure of the integrated cavity frustum sleeve continuously pushes multiple ejection blocks outward, thereby providing extrusion to the inner walls of the two circular holes, and the fixation of the overall casing connection mechanism is completed by friction. During subsequent disassembly, the T-rod is first reversed to release the extrusion of the multiple ejection blocks, and then as shown in the figure, the T-rod is completely passed through the threaded double-layer sleeve. After adjusting the angle, the entire casing connection mechanism can be pulled out. Since the extrusion and fixation are completed by multiple ejection blocks, there is no thread on the inner wall of the circular hole, which is more convenient to clean, and the installation and disassembly are time-saving and labor-saving.

[0020] Furthermore, the connecting drive plate assembly includes a connecting plate body, the outer walls of the connecting plate body are respectively fixedly connected with a motor mounting seat and a plurality of mounting ears, the bottom of the motor mounting seat is fixedly connected with a driving motor, the output end of the driving motor is provided with a driving gear, and the top of the connecting plate body is fixedly connected with a plurality of limit bars corresponding to the casing limit fixing mechanism.

[0021] Through the above technical solution, multiple mounting ears are used to achieve fixation between the drill bit and the drill rig. At the same time, the driving motor and the driving gear can drive the overall transmission mechanism to rotate, and then the transmission mechanism can drive multiple sets of casing limiting and fixing mechanisms to move.

[0022] Furthermore, the casing limit fixing mechanism includes a first sliding block and a second sliding block slidably connected to the connecting driving plate assembly, the tops of both sides of the first sliding block and the second sliding block are fixedly connected to L-shaped limit plates, the tops of the first sliding block and the second sliding block are fixedly connected to transmission teeth, the bottom of the first sliding block is fixedly connected to an arc-shaped pressing block, the inner side of the arc-shaped pressing block is fixedly connected to a locking circular block, the interior of the second sliding block is slidably connected to an adaptable sliding block, a reset spring is fixedly connected between the inner walls of the adaptable sliding block and the second sliding block, and the bottom of the adaptable sliding block is fixedly connected to a guide limit card plate.

[0023] Through the above technical solution, the driving motor drives the driving gear to rotate, and then drives the transmission gear ring meshing with it, and then drives multiple transmission teeth through the rotation of the bottom chuck nut, so that the multiple first sliding blocks and the second sliding blocks move closer to the center at the same time, and then the guide limit card plate and the arc-shaped pressing block move closer to the outer wall of the first sleeve inner shell. Due to the presence of the reset spring, the inner side of the guide limit card plate is closer to the center position than the inner side of the arc-shaped pressing block. During driving, the multiple guide limit card plates first reach the specified position, and then rotate to adjust the angle of the overall connecting drive plate assembly, so that the multiple guide limit card plates and the guide bars of the outer wall of the first sleeve inner shell correspond, and then push the connecting drive plate assembly to descend, so that the multiple guide limit card plates and the multiple guide bars The cam is engaged with each other, thereby fixing the position, and then the driving motor continues to drive the driving gear to rotate, and at this time the transmission mechanism continues to drive the multiple first sliding blocks and the second sliding blocks to move until the multiple arc-shaped pressing blocks are attached to the outer wall of the arc-shaped pressing blocks. At this time, due to the position determination of the guide limit card plate and the guide bar, the multiple engaging round blocks are just engaged with the circular holes on the outer wall of the first sleeve inner shell. In this process, since the guide limit card plate has already been attached to the outer wall of the first sleeve inner shell at the beginning, only the reset spring can be compressed during the subsequent movement of the second sliding block, and finally the casing is automatically clamped and fixed, which saves time. At the same time, it can also clamp inner and outer cylinders of different diameters, thereby improving the applicability of the device.

[0024] Furthermore, the transmission mechanism includes a transmission gear ring, and a chuck nut is fixedly connected to the bottom of the transmission gear ring.

[0025] Through the above technical solution, the rotation of the chuck nut is achieved by designing a transmission gear ring, and then multiple sets of casing limiting and fixing mechanisms can be driven simultaneously through the chuck nut.

[0026] The beneficial effects of the present invention are as follows: (1) The present invention increases the number of connecting inner cylinder assemblies and connecting outer cylinder assemblies to be installed by designing the bottom outer cylinder assembly and the connecting outer cylinder assembly, and in the process of deepening the multiple connecting inner cylinder assemblies and the bottom inner cylinder assembly, the entire inner cylinder only needs to overcome the soil friction below the outer cylinder, thereby improving the installation efficiency of the casing. At the same time, when the casing is subsequently pulled out, the outer cylinder can also reduce the friction of the inner cylinder to achieve rapid disassembly; (2) The present invention designs a casing connection mechanism, through which a T-bar is inserted into the rectangular through hole in the threaded double-layer sleeve and rotated, and the inclined surface structure of the integrated cavity frustum sleeve continuously pushes the multiple ejection blocks outward, and then pushes the two ejection blocks outward. The inner wall of each circular hole provides extrusion, and the fixing of the entire casing connection mechanism is completed by friction. When disassembling later, the T-bar is first reversed to release the extrusion of multiple ejection blocks, and then the T-bar is completely passed through the threaded double-layer sleeve. After adjusting the angle, the entire casing connection mechanism can be pulled out. Since the extrusion and fixation are completed by multiple ejection blocks, there is no thread on the inner wall of the circular hole, which is more convenient to clean, and the installation and disassembly are time-saving and labor-saving; (3) The present invention realizes automatic clamping and fixing of the casing by designing a casing limiting and fixing mechanism through a movable arc-shaped pressing block and a guide limiting clamping plate, saving time. At the same time, it can also clamp inner and outer cylinders of different diameters, thereby improving the scope of application of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the overall structure of the casing of the present invention that penetrates deep into the ground;

[0028] Figure 2 yes Figure 1 Schematic diagram of the explosion structure;

[0029] Figure 3 It is a schematic diagram of the three-dimensional structure of the bottom inner cylinder assembly, the connecting inner cylinder assembly, the bottom outer cylinder assembly and the connecting outer cylinder assembly of the present invention;

[0030] Figure 4 yes Figure 3 Schematic diagram of the cross-section structure;

[0031] Figure 5 yes Figure 4 A partial enlarged view of point A in the middle;

[0032] Figure 6 It is a schematic structural diagram of the casing connection mechanism of the present invention;

[0033] Figure 7 2 is a schematic cross-sectional structural diagram of the casing connection mechanism of the present invention;

[0034] Figure 8 This is a schematic diagram of the explosion structure of the casing connection mechanism of the present invention;

[0035] Figure 9 yes Figure 8 Schematic diagram of the side structure;

[0036] Figure 10 It is a structural schematic diagram of the connection drive plate assembly of the present invention;

[0037] Figure 11 1 is a schematic cross-sectional structural diagram of a connection drive plate assembly of the present invention;

[0038] Figure 12 2 is a schematic diagram of a three-dimensional cross-sectional structure of a connection drive plate assembly of the present invention;

[0039] Figure 13 This is a schematic diagram of the internal structure of the connecting drive board assembly and the protective shell of the present invention;

[0040] Figure 14 This is a schematic diagram of the explosion structure of the casing limiting and fixing mechanism of the present invention;

[0041] Figure 15 It is a schematic diagram of the bottom structure of the transmission mechanism of the present invention;

[0042] Figure 16 This is a schematic diagram of the sleeve connection structure of the bottom inner cylinder assembly and the bottom outer cylinder assembly of the present invention;

[0043] Figure 17 This is a schematic diagram of the installation structure of the casing connection mechanism of the present invention;

[0044] Figure 18 It is a schematic diagram of the disassembly structure of the casing connection mechanism of the present invention.

[0045] Figure numerals: 1. bottom inner tube assembly; 101. bottom inner casing; 102. first tooth; 103. first sleeve inner shell; 2. connecting inner tube assembly; 201. connecting inner casing; 202. first sleeve outer shell; 203. second sleeve inner shell; 3. bottom outer tube assembly; 301. bottom outer casing; 302. second tooth; 303. third sleeve inner shell; 4. connecting outer tube assembly; 401. connecting outer casing; 402. second sleeve outer shell; 403. fourth sleeve inner shell; 5. casing connecting mechanism; 501. connecting block; 502. fixed threaded sleeve; 503. threaded double-layer sleeve; 504. integrated cavity Cone sleeve; 505, ejector block; 506, limit block; 6, connecting drive plate assembly; 601, connecting plate body; 602, mounting ear; 603, motor mounting seat; 604, driving motor; 605, driving gear; 606, limit strip; 7, protective shell; 8, casing limit fixing mechanism; 801, first sliding block; 802, second sliding block; 803, L-shaped limit plate; 804, transmission teeth; 805, arc-shaped pressing block; 806, engaging round block; 807, adapting sliding block; 808, reset spring; 809, guide limit clamping plate; 9, transmission mechanism; 91, transmission gear ring; 92, chuck nut. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0047] like Figure 1-Figure 3 As shown, an anti-collapse hole casing structure for the construction of the grouting pile foundation in the alluvial plain of the Yellow River in this embodiment includes a bottom inner tube assembly 1, the bottom inner tube assembly 1 includes a bottom inner casing 101, the bottom of the bottom inner casing 101 is fixedly connected with a plurality of first teeth 102, and the top of the bottom inner casing 101 is fixedly connected with a first sleeve inner shell 103. Through the plurality of first teeth 102, the bottom inner casing 101 can be rotated back and forth when pressed down to quickly penetrate into the soil, and the first sleeve inner shell 103 can be used to realize Now, the connection with the connecting inner barrel assembly 2 is shown. A plurality of connecting inner barrel assemblies 2 are provided on the top of the bottom inner barrel assembly 1. The connecting inner barrel assembly 2 includes a connecting inner casing 201. The bottom of the connecting inner casing 201 is fixedly connected with a first sleeve outer shell 202. The top of the connecting inner casing 201 is fixedly connected with a second sleeve inner shell 203. Through the first sleeve outer shell 202 and the second sleeve inner shell 203, the bottom inner barrel assembly 1 and other connecting inner barrel assemblies 2 can be connected to each other, thereby realizing splicing casings.

[0048] like Figure 1-Figure 5As shown, the outer walls of the multiple connecting inner tube assemblies 2 are respectively provided with a bottom outer tube assembly 3 and a connecting outer tube assembly 4, the bottom outer tube assembly 3 includes a bottom outer casing 301, the bottom of the bottom outer casing 301 is fixedly connected with a plurality of second teeth 302, and the top of the bottom outer casing 301 is fixedly connected with a third sleeve inner shell 303. Through the plurality of second teeth 302, the bottom outer casing 301 can be quickly penetrated into the soil by rotating back and forth when pressed down. The connecting outer tube assembly 4 includes a connecting outer casing 401, the bottom of the connecting outer casing 401 is fixedly connected with a second sleeve outer shell 402, and the top of the connecting outer casing 401 is fixedly connected with a fourth sleeve inner shell 403. Through the second sleeve outer shell 402 and the fourth sleeve inner shell 403, connection with the bottom outer tube assembly 3 and The other connecting outer tube components 4 are connected to each other, and a plurality of circular holes corresponding to the casing connection mechanism 5 are provided on the first sleeve inner shell 103, the first sleeve outer shell 202, the second sleeve inner shell 203, the third sleeve inner shell 303, the second sleeve outer shell 402 and the fourth sleeve inner shell 403, and the bottoms of the first sleeve outer shell 202 and the second sleeve outer shell 402 are provided with guide grooves. The length of the bottom inner casing 101 is greater than the length of the bottom outer casing 301. The splicing function between the casings can be achieved through the corresponding circular holes and the casing connection mechanism 5, and the positioning function of the circular holes can be achieved through the guide grooves and the corresponding guide strips, which facilitates the subsequent installation of the casing connection mechanism 5 and ensures that the bottom inner tube component 1 and the bottom outer tube component 3 can be lowered together at the beginning.

[0049] like Figures 1-9 As shown, multiple casing connection mechanisms 5 are installed between the bottom inner tube component 1 and the multiple connecting inner tube components 2, and between the bottom outer tube component 3 and the connecting outer tube component 4. The casing connection mechanism 5 includes a connecting block 501, and a fixed threaded sleeve 502 is fixedly connected to the inner wall of the connecting block 501. A threaded double-layer sleeve 503 is spirally connected to the fixed threaded sleeve 502, and an integrated cavity frustum sleeve 504 is fixedly connected to the outer wall of the threaded double-layer sleeve 503. The interior of the connecting block 501 is slidably connected to multiple ejection blocks 505, and the bottoms of both sides of the multiple ejection blocks 505 are fixedly connected to limiting blocks 506. The first sleeve shell 202 is sleeved on the outer wall of the first sleeve inner shell 103, thereby completing the sleeve connection of the bottom inner tube component 1 and the connecting inner tube component 2, and then positioning is performed through the groove and guide bar of the first sleeve shell 202 so that the circular holes of the two are aligned, and the casing connection mechanism 5 is directly inserted into the two fitting circular holes, and then as shown in FIG. Figure 17The T-shaped rod in the sleeve is inserted into the rectangular through hole in the threaded double-layer sleeve 503, and then rotated to rotate the threaded double-layer sleeve 503 into the interior of the connecting block 501 through the spiral connection with the fixed threaded sleeve 502. At this time, the inclined surface structure of the integrated cavity frustum sleeve 504 continuously pushes the multiple ejection blocks 505 outward, thereby providing extrusion to the inner walls of the two circular holes, and the fixation of the overall casing connection mechanism 5 is completed by friction. When disassembling later, the T-shaped rod is first reversed to release the extrusion of the multiple ejection blocks 505, and then Figure 18 , completely pass the T-bar through the threaded double-layer sleeve 503, and after adjusting the angle, the entire casing connection mechanism 5 can be pulled out. Since the extrusion fixation is completed by multiple ejection blocks 505, there is no thread on the inner wall of the round hole, which is more convenient to clean, and installation and disassembly are time-saving and labor-saving.

[0050] like Figures 1-13 As shown, a connecting drive plate assembly 6 is provided on the top of multiple connecting inner cylinder assemblies 2, and the connecting drive plate assembly 6 includes a connecting plate body 601, and the outer walls of the connecting plate body 601 are fixedly connected with a motor mounting seat 603 and multiple mounting ears 602 respectively. The bottom of the motor mounting seat 603 is fixedly connected with a driving motor 604, and the output end of the driving motor 604 is provided with a driving gear 605. The top of the connecting plate body 601 is fixedly connected with multiple limiting bars 606 corresponding to the casing limiting and fixing mechanisms 8, and the fixation between the casing and the drill bit is achieved through multiple mounting ears 602. At the same time, the driving motor 604 and the driving gear 605 can drive the overall transmission mechanism 9 to rotate, and then drive the multiple groups of casing limiting and fixing mechanisms 8 to move through the transmission mechanism 9.

[0051] like Figures 1-14As shown, the top of the connecting drive plate assembly 6 is fixedly connected to a protective shell 7, and the connecting drive plate assembly 6 is respectively slidably connected to a plurality of sets of casing limiting fixing mechanisms 8, and the casing limiting fixing mechanism 8 includes a first sliding block 801 and a second sliding block 802 which are slidably connected to the connecting drive plate assembly 6, and the tops of the first sliding block 801 and the second sliding block 802 on both sides are fixedly connected to an L-shaped limiting plate 803, and the tops of the first sliding block 801 and the second sliding block 802 are fixedly connected to transmission teeth 804, and the bottom of the first sliding block 801 is fixedly connected to an arc-shaped pressing block 805, and the inner side of the arc-shaped pressing block 805 is fixedly connected to a snap-fit ​​circular block 806, and the inner sliding block 802 is fixedly connected to the arc-shaped pressing block 805. The adaptable sliding block 807 is connected, and a return spring 808 is fixedly connected between the inner wall of the adaptable sliding block 807 and the second sliding block 802. The bottom of the adaptable sliding block 807 is fixedly connected with a guide limit card plate 809. The driving motor 604 drives the driving gear 605 to rotate, thereby driving the transmission gear ring 91 engaged therewith, and then drives the multiple transmission teeth 804 through the rotation of the bottom chuck nut 92, so that the multiple first sliding blocks 801 and the second sliding blocks 802 are simultaneously moved closer to the center, thereby making the guide limit card plate 809 and the arc-shaped pressing block 805 move closer to the outer wall of the first sleeve inner shell 103. Due to the presence of the return spring 808, the inner side of the guide limit card plate 809 is larger than the arc-shaped pressing block 805. The inner side of the pressing block 805 is closer to the center position (to ensure that when the guide limit card plate 809 descends to complete the position fixation, the engaging round block 806 that descends and protrudes with it will not be blocked by the first sleeve inner shell 103). During driving, multiple guide limit card plates 809 first reach the specified position, and then rotate to adjust the angle of the overall connecting drive plate assembly 6, so that multiple guide limit card plates 809 and the guide bars on the outer wall of the first sleeve inner shell 103 correspond to each other, and then push the connecting drive plate assembly 6 to descend, so that multiple guide limit card plates 809 and multiple guide bars are engaged with each other, thereby fixing the position, and then the driving motor 604 continues to drive the driving gear 605 to rotate, and at this time, the transmission mechanism 9 continues to drive Multiple first sliding blocks 801 and second sliding blocks 802 move until multiple arc-shaped pressing blocks 805 are in contact with the outer wall of the arc-shaped pressing block 805. At this time, due to the position determination of the guide limit card plate 809 and the guide bar, multiple engaging round blocks 806 are just engaged with the circular holes on the outer wall of the first sleeve inner shell 103. In this process, since the guide limit card plate 809 has already been in contact with the outer wall of the first sleeve inner shell 103 at the beginning, only the reset spring 808 can be compressed during the subsequent movement of the second sliding block 802, and finally the casing is automatically clamped and fixed, which saves time. At the same time, it can also clamp inner and outer cylinders of different diameters, thereby improving the scope of application of the device.

[0052] like Figures 1-15As shown, a transmission mechanism 9 is arranged between the tops of multiple sets of casing limiting and fixing mechanisms 8, and the transmission mechanism 9 includes a transmission gear ring 91. The bottom of the transmission gear ring 91 is fixedly connected to a chuck nut 92. The transmission gear ring 91 is designed to realize the rotation of the chuck nut 92, and then the chuck nut 92 can simultaneously drive multiple sets of casing limiting and fixing mechanisms 8.

[0053] The working principle of this embodiment is as follows: the connecting drive plate assembly 6 is installed on the drill head, and when in use, Figure 16 , the bottom inner cylinder assembly 1 and the bottom outer cylinder assembly 3 are sleeved and erected, the drill bit of the drilling rig drives the connecting driving plate assembly 6 to be suspended on the top of the bottom inner cylinder assembly 1 and the bottom outer cylinder assembly 3, and then the driving motor 604 drives the driving gear 605 to rotate, thereby driving the transmission gear ring 91 engaged therewith, and then driving the multiple transmission teeth 804 through the rotation of the bottom chuck nut 92, so that the multiple first sliding blocks 801 and the second sliding blocks 802 are simultaneously moved closer to the center, thereby making the guide limit card plate 809 and the arc-shaped pressing block 805 move closer to the outer wall of the first sleeve inner shell 103. Due to the presence of the return spring 808, the inner side of the guide limit card plate 809 is closer to the center position than the inner side of the arc-shaped pressing block 805. During driving, the multiple guide limit card plates 809 reach the specified position first, and then rotate to adjust the angle of the overall connection driving plate assembly 6, so that the multiple The guide limit card plate 809 corresponds to the guide bar on the outer wall of the first sleeve inner shell 103, and then pushes the connecting driving plate assembly 6 to descend, so that the multiple guide limit card plates 809 and the multiple guide bars are engaged with each other, thereby fixing the position, and then the driving motor 604 continues to drive the driving gear 605 to rotate. At this time, the transmission mechanism 9 continues to drive the multiple first sliding blocks 801 and the second sliding block 802 to move until the multiple arc-shaped pressing blocks 805 are attached to the outer wall of the arc-shaped pressing block 805. At this time, due to the position determination of the guide limit card plate 809 and the guide bar, the multiple engaging round blocks 806 are just engaged with the circular holes on the outer wall of the first sleeve inner shell 103. In this process, since the guide limit card plate 809 has already been attached to the outer wall of the first sleeve inner shell 103 at the beginning, only the return spring 808 can be compressed during the subsequent movement of the second sliding block 802.

[0054] Then, the drilling rig presses the entire connecting drive plate assembly 6, and then presses the bottom inner cylinder assembly 1 into the soil. In the initial pressing process, the top of the bottom outer cylinder assembly 3 is pressed by multiple arc-shaped pressing blocks 805, so that the bottom inner cylinder assembly 1 and the bottom outer cylinder assembly 3 are simultaneously pressed down into the soil, ensuring that the tops of the bottom inner cylinder assembly 1 and the bottom outer cylinder assembly 3 are above a certain height above the ground. Subsequently, the connecting inner cylinder assembly 2 and the bottom outer cylinder assembly 3 are added according to the designed depth. When connecting, the driving motor 604 is reversed, thereby releasing the fixation of the bottom inner cylinder assembly 1, and re-clamping the connecting inner cylinder assembly 2 to the top of the bottom inner cylinder assembly 1 from one side, and the first sleeve shell 202 is sleeved on the outer wall of the first sleeve inner shell 103, thereby completing the sleeve connection of the bottom inner cylinder assembly 1 and the connecting inner cylinder assembly 2, and then positioning is performed by the groove and guide bar of the first sleeve shell 202, so that the circular holes of the two are aligned, and the casing connecting mechanism 5 is directly inserted into the two fitting circular holes, and then, as shown in FIG. Figure 17 The T-shaped rod in the sleeve is inserted into the rectangular through hole in the threaded double-layer sleeve 503, and then rotated to rotate the threaded double-layer sleeve 503 into the interior of the connecting block 501 through the spiral connection with the fixed threaded sleeve 502. At this time, the inclined surface structure of the integrated cavity frustum sleeve 504 continuously pushes the multiple ejection blocks 505 outward, thereby providing extrusion to the inner walls of the two circular holes, and the fixation of the overall casing connection mechanism 5 is completed by friction. When disassembling later, the T-shaped rod is first reversed to release the extrusion of the multiple ejection blocks 505, and then Figure 18 , completely pass the T-bar through the threaded double-layer sleeve 503, and after adjusting the angle, the entire casing connection mechanism 5 can be pulled out;

[0055] Subsequently, different numbers of connecting inner tube assemblies 2 and connecting outer tube assemblies 4 are installed by designing the depth. During the deepening process of multiple connecting inner tube assemblies 2 and the bottom inner tube assembly 1, the entire inner tube only needs to overcome the soil friction below the outer tube, thereby improving the installation efficiency of the casing. At the same time, when the casing is subsequently pulled out, the outer tube can also reduce the friction of the inner tube to achieve rapid disassembly.

[0056] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention.

Claims

1. A hole casing structure for preventing collapse of bored pile foundations in the alluvial plain of the Yellow River, comprising a bottom inner tube assembly (1), characterized in that: A plurality of connecting inner cylinder assemblies (2) are provided on the top of the bottom inner cylinder assembly (1), and a bottom outer cylinder assembly (3) and a connecting outer cylinder assembly (4) are respectively provided on the outer walls of the plurality of connecting inner cylinder assemblies (2); A plurality of casing connection mechanisms (5) are installed between the bottom inner cylinder assembly (1) and the plurality of connecting inner cylinder assemblies (2) and between the bottom outer cylinder assembly (3) and the connecting outer cylinder assembly (4). The casing connection mechanism (5) comprises a connection block (501), a fixed threaded sleeve (502) is fixedly connected to one side of the inner wall of the connection block (501), a threaded double-layer sleeve (503) is spirally connected to the fixed threaded sleeve (502), an integrated cavity frustum sleeve (504) is fixedly connected to one side of the outer wall of the threaded double-layer sleeve (503), a plurality of ejection blocks (505) are slidably connected to the interior of the connection block (501), and a connection drive plate assembly (6) is provided on the top of the plurality of connecting inner cylinder assemblies (2); The top of the connecting drive plate assembly (6) is fixedly connected to a protective shell (7), and a plurality of sets of casing position limiting and fixing mechanisms (8) are slidably connected to the connecting drive plate assembly (6), and a transmission mechanism (9) is provided between the tops of the plurality of sets of casing position limiting and fixing mechanisms (8).

2. The anti-collapse casing structure for the Yellow River alluvial plain cast-in-place pile foundation construction according to claim 1 is characterized in that: The bottom inner tube assembly (1) comprises a bottom inner casing (101), the bottom of the bottom inner casing (101) is fixedly connected to a plurality of first teeth (102), and the top of the bottom inner casing (101) is fixedly connected to a first sleeve inner shell (103).

3. The anti-collapse casing structure for the Yellow River alluvial plain cast-in-place pile foundation construction according to claim 2 is characterized in that: The connecting inner tube assembly (2) comprises a connecting inner casing (201), the bottom of the connecting inner casing (201) is fixedly connected to a first sleeve outer shell (202), and the top of the connecting inner casing (201) is fixedly connected to a second sleeve inner shell (203).

4. The anti-collapse casing structure for the Yellow River alluvial plain cast-in-place pile foundation construction according to claim 3 is characterized in that: The bottom outer tube assembly (3) comprises a bottom outer casing (301), the bottom of the bottom outer casing (301) is fixedly connected to a plurality of second teeth (302), and the top of the bottom outer casing (301) is fixedly connected to a third sleeve inner shell (303).

5. The anti-collapse casing structure for the construction of the grouting pile foundation in the alluvial plain of the Yellow River according to claim 4, characterized in that: The connecting outer tube assembly (4) comprises a connecting outer tube (401), the bottom of the connecting outer tube (401) is fixedly connected to a second sleeve outer shell (402), and the top of the connecting outer tube (401) is fixedly connected to a fourth sleeve inner shell (403).

6. The anti-collapse casing structure for the construction of the grouting pile foundation in the alluvial plain of the Yellow River according to claim 5, characterized in that: The first sleeve inner shell (103), the first sleeve outer shell (202), the second sleeve inner shell (203), the third sleeve inner shell (303), the second sleeve outer shell (402) and the fourth sleeve inner shell (403) are all provided with a plurality of circular holes corresponding to the casing connection mechanism (5), and the bottoms of the first sleeve outer shell (202) and the second sleeve outer shell (402) are both provided with guide grooves, and the length of the bottom inner casing (101) is greater than the length of the bottom outer casing (301).

7. The anti-collapse casing structure for the Yellow River alluvial plain cast-in-place pile foundation construction according to claim 1 is characterized in that: The bottoms on both sides of the plurality of ejection blocks (505) are fixedly connected to the limiting blocks (506).

8. The anti-collapse casing structure for the Yellow River alluvial plain cast-in-place pile foundation construction according to claim 1 is characterized in that: The connecting drive plate assembly (6) comprises a connecting plate body (601), the outer wall of the connecting plate body (601) being fixedly connected to a motor mounting seat (603) and a plurality of mounting ears (602), the bottom of the motor mounting seat (603) being fixedly connected to a driving motor (604), the output end of the driving motor (604) being provided with a driving gear (605), and the top of the connecting plate body (601) being fixedly connected to a plurality of limiting bars (606) corresponding to the casing limiting fixing mechanism (8).

9. The anti-collapse casing structure for the construction of the grouting pile foundation in the alluvial plain of the Yellow River according to claim 1, characterized in that: The casing limiting and fixing mechanism (8) comprises a first sliding block (801) and a second sliding block (802) which are slidably connected to the connecting drive plate assembly (6); the tops of both sides of the first sliding block (801) and the second sliding block (802) are fixedly connected with L-shaped limiting plates (803); the tops of the first sliding block (801) and the second sliding block (802) are fixedly connected with transmission teeth (804); the bottom of the first sliding block (801) is fixedly connected with an arc-shaped pressing block (805); the inner side of the arc-shaped pressing block (805) is fixedly connected with a locking circular block (806); the interior of the second sliding block (802) is slidably connected with an adapting sliding block (807); a reset spring (808) is fixedly connected between the adapting sliding block (807) and the inner wall of the second sliding block (802); and the bottom of the adapting sliding block (807) is fixedly connected with a guide limiting clamping plate (809).

10. The anti-collapse casing structure for the construction of the grouting pile foundation in the Yellow River alluvial plain according to claim 1, characterized in that: The transmission mechanism (9) comprises a transmission gear ring (91), and a chuck nut (92) is fixedly connected to the bottom of the transmission gear ring (91).

Images