Pile foundation full pile casing for expansive soil and argillaceous sandstone construction and method thereof

Abstract

The invention discloses a pile foundation full pile casing for expansive soil and argillaceous sandstone construction and a method thereof. The pile foundation full pile casing comprises a casing body, a plurality of swingable dovetail claws are installed on the end wall of the bottom of the casing body, a plurality of driving rods are vertically and slidably connected into the casing wall of the casing body in a penetrating mode, and the dovetail claws are driven to swing through lifting of the driving rods; the outer wall, close to a top port, of the barrel is rotationally sleeved with a lantern ring, a waveform groove is formed in the inner wall of the lantern ring, a cylindrical head is installed on the outer wall of the driving rod, and the outer wall of the cylindrical head is in sliding connection with the inner wall of the waveform groove; a hanging rod is hinged to the outer wall of the lantern ring. According to the method, the problem that under the complex geological condition, the pile casing is prone to deviation or inclination, and consequently the position of a pile foundation deviates is solved.

Description

Technical Field

[0001] The invention relates to the technical field of pile foundation full casing, in particular to a pile foundation full casing for construction of expansive soil and muddy sandstone and a method thereof. Background Art

[0002] In the field of construction engineering, pile foundation construction is an extremely important basic engineering link, and its quality is directly related to the stability and safety of the entire building structure. As two special geological types, expansive soil and muddy sandstone bring many severe challenges to pile foundation construction.

[0003] Expansive soil has the significant characteristics of swelling when exposed to water and shrinking when dehydrated. During the construction of pile foundations, when the casing is inserted into the expansive soil area, the expansion characteristics of the soil may cause the soil pressure around the casing to increase sharply, causing the casing to be subjected to strong lateral extrusion. This uneven soil pressure can easily cause the casing to deform, damage, or even fail to be smoothly inserted to the predetermined depth. Moreover, after the construction disturbance, the changes in the physical properties of the expansive soil are difficult to predict, further increasing the complexity and uncertainty of the construction.

[0004] Muddy sandstone is a soft rock with relatively low strength and certain viscosity. When the pile foundation casing is screwed in, the muddy sandstone tends to adhere to the surface of the casing to form a mud cake, thereby increasing the friction between the casing and the soil. This will not only greatly increase the rotational resistance of the casing, resulting in increased energy consumption of construction equipment, but may also cause the casing to get stuck and locked, seriously affecting the construction progress and efficiency. In addition, when facing such complex geology, traditional pile foundation casings lack effective soil entry assistance and soil treatment mechanisms, and can often only rely on strong mechanical thrust for forced insertion, which undoubtedly places extremely high performance requirements on construction equipment and is prone to equipment failure and damage, increasing construction costs and risks.

[0005] At the same time, some existing pile foundation construction technologies have deficiencies in the positioning and guiding of the casing. Under complex geological conditions, the casing is prone to displacement or tilt, resulting in deviations in the position of the pile foundation and failure to meet the design requirements. Moreover, during the process of inserting and removing the casing, there is a lack of a stable, efficient and geologically friendly operating method, making it difficult to achieve refined control and management of the construction process. In summary, there is an extremely urgent practical need to develop a pile foundation full casing and its supporting construction device and method that are specifically suitable for the construction of expansive soil and muddy sandstone, in order to overcome the many defects of the existing technology and improve the quality, efficiency and safety of pile foundation construction under such special geological conditions. Summary of the invention

[0006] In order to solve the problem that the casing is easily offset or tilted under complex geological conditions, resulting in position deviation of the pile foundation, the purpose of the present invention is to provide a pile foundation full casing and method for construction of expansive soil and muddy sandstone.

[0007] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a full casing for pile foundation for construction of expansive soil and muddy sandstone, comprising a cylinder body, a plurality of swingable dovetail claws are installed at the end wall at the bottom of the cylinder body, a plurality of driving rods are vertically slidably penetrated in the cylinder wall of the cylinder body, and the dovetail claws are driven to swing by the lifting and lowering of the driving rods; a collar is rotatably sleeved on the outer wall of the cylinder body near the top port, a corrugated groove is provided on the inner wall of the collar, a columnar head is installed on the outer wall of the driving rod, and the outer wall of the columnar head is slidably connected to the inner wall of the corrugated groove; a hanging rod is hinged on the outer wall of the collar.

[0008] Preferably, a circular inlay groove is provided at the end wall at the bottom of the cylinder, a rectangular groove is provided at the top of the circular inlay groove, a circular block is rotatably sleeved on the inner wall of the circular inlay groove, the outer wall of the bottom of the circular block is exposed to the outside, and the outer wall exposed to the outside is fixedly connected to the dovetail claw.

[0009] Preferably, an open groove is provided on the outer wall of the circular block located at the rectangular groove, and the inner wall of the open groove is rotatably connected to a connecting rod through a pin shaft, the top of the connecting rod is hinged with a first U-shaped block, and the top surface of the first U-shaped block is fixedly connected to the bottom of the driving rod; a plurality of strip holes are provided on the outer wall of the cylinder near the top, and the outer wall of the connecting rod is fixedly connected to a connecting block that is slidably connected to the inner wall of the strip hole, and the connecting block is fixedly connected to the columnar head.

[0010] Preferably, two connecting plates are fixedly connected to both ends of the hanging rod, a rectangular block is hinged on the side wall between the two connecting plates, and the rectangular block is fixedly connected to the outer wall of the sleeve.

[0011] The camming wheel of the present invention is a kind of track roller of the present invention, and its track roller is used for track roller of the present invention.

[0012] The construction method steps are as follows:

[0013] Step 1: fix the bottom of the shell at the construction site, use a crane to lift the pile foundation full casing into the full casing construction device, and clamp the outer wall of the cylinder with a plurality of compression guide wheels;

[0014] Step 2: fix a plurality of drawstrings on the hanging rod and keep the drawstrings in a taut state;

[0015] Step 3: The driving mechanism drives the first rotating ring and the second rotating ring to rotate at the same time, so that the cylinder clamped by the plurality of pressing guide wheels rotates, and at the same time, the second rotating ring drives the plurality of winding wheels to rotate to wind up the draw belt;

[0016] Step 4: A plurality of pull belts pull down the cylinder, the cylinder rotates relative to the sleeve, the cylindrical head slides in the corrugated groove, and the driving rod moves up and down reciprocatingly;

[0017] Step 5: The lifting and lowering of the driving rod drives the dovetail claw to swing, turning over the soil below it, and at the same time the cylinder descends and rotates into the ground;

[0018] Step 6: After reaching the specified depth, the soil inside the cylinder is dug out by a claw machine, and then the pile foundation is constructed;

[0019] Step seven, after the pile foundation construction is completed; several supporting groove wheels prop up the pulling belt, the driving mechanism drives the first rotating ring and the second rotating ring to rotate at the same time, and several winding wheels wind up the pulling belt, then several pulling belts pull the pile foundation casing upward, and at the same time the cylinder rotates to pull out the pile foundation casing.

[0020] Preferably, the outer shell includes a bottom plate, the top surface of the bottom plate is fixedly connected to a side frame, the top surface of the side frame is fixedly connected to a top plate, and circular holes are opened at the centers of the bottom plate and the top plate for passing the full casing of the pile foundation; a plurality of columnar blocks are fixedly connected to the top surface of the bottom plate, and the top of the columnar blocks is fixedly connected to the bottom of the fixed plate; a spacer is fixedly connected to the inner wall of the circular hole of the top plate, and the outer wall of the spacer near the bottom port is rotatably sleeved on the inner wall at the top port of the first swivel; a plurality of strip openings arranged in a circular array are opened on the top of the top plate; and the pull belt movably passes through the strip opening.

[0021] Preferably, the inner wall of the first swivel is fixedly connected to a plurality of first hydraulic cylinders arranged in a circular array, the telescopic end of the first hydraulic cylinder is fixedly connected to a U-shaped frame, the inner wall of the U-shaped frame is fixedly connected to a plurality of arc-shaped mounting shafts, and a plurality of clamping guide wheels are rotatably sleeved on the outer wall of the arc-shaped mounting shaft.

[0022] Preferably, the top surface of the fixed disk is fixedly connected to a plurality of mounting blocks arranged in a circular array, a U-mounting groove is opened on the top of the mounting block, the winding wheel is located in the U-mounting groove, the side wall of the mounting block is rotatably connected with the first connecting shaft, the winding wheel is fixedly sleeved on the outer wall of the first connecting shaft, one end of the first connecting shaft is fixedly connected with the first bevel gear, the side wall of the mounting block is fixedly connected to the L-shaped plate, the L-shaped plate, the side wall of the L-shaped plate is rotatably connected with the second connecting shaft, the two ends of the second connecting shaft are respectively fixedly connected with the second bevel gear and the driven gear, the second bevel gear is meshed with the first bevel gear, and the top end wall of the second rotating ring is provided with teeth meshing with the driven gear.

[0023] Preferably, the driving mechanism includes a motor fixedly mounted inside the fixed disk, the output end shaft of the motor is connected to a transmission gear, the transmission gear is meshed with a first gear ring and a second gear ring, the first gear ring is fixedly sleeved on the outer wall of the first rotating ring, and the second gear ring is fixedly sleeved on the inner wall of the second rotating ring.

[0024] Preferably, the top surface of the fixed plate is fixedly connected to a plurality of second hydraulic cylinders arranged in a circular array, the telescopic end of the second hydraulic cylinder is movable and vertically upward through the top surface of the outer shell, and the top of the telescopic end is fixedly connected to an annular support plate, the top surface of the annular support plate is fixedly connected to a plurality of second U-shaped blocks arranged in a circular array, and the supporting groove wheel is rotatably installed inside the second U-shaped block through a pin shaft.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The present invention can effectively turn over special soils such as expansive soil and muddy sandstone during the construction process through the dovetail claw structure at the bottom of the pile foundation full casing. On the one hand, this turning action can destroy the original structure of the soil, reduce its resistance to the insertion of the casing, and make the casing easier to rotate into the ground; on the other hand, through the continuous disturbance of the dovetail claw, it can prevent the soil from accumulating around the casing and jamming the casing, thereby ensuring the stability and continuity of the casing during the rotation and sinking process, greatly improving the adaptability of construction under complex geological conditions, and reducing construction interruptions or failures caused by geological problems.

[0027] 2. The present invention synchronizes the automatic swing of the dovetail claw with the rotation and sinking of the casing, without the need for additional complicated operations or waiting time, and continuously processes the soil below, making the construction process smooth and efficient. In the casing extraction stage, the casing can also be quickly and smoothly removed from the ground through the linkage of various components, which reduces the construction period, improves the overall construction efficiency, and reduces the construction cost.

[0028] 3. The present invention effectively avoids the jamming phenomenon through the swingable design of the dovetail claw, and reduces the risk of damage to the dovetail claw itself and other parts of the casing due to forced rotation or jamming.

[0029] 4. The present invention cooperates closely with the rotating action of the casing by encircling and pulling the pull belt downward, so that the casing can obtain a stable and continuous downward pulling force in the vertical direction. Under geological conditions such as expansive soil and muddy sandstone, this synergistic effect can effectively overcome the resistance of the soil to the casing, ensuring that the casing is smoothly and quickly rotated into the ground to the designed depth, greatly shortening the time for the casing to be buried and improving the construction efficiency.

[0030] 5. In the present invention, since the pull belt is evenly wrapped around the hanging rod at the top of the casing, a balanced force can be applied to the casing during the downward pulling process, effectively preventing the casing from tilting or shifting due to uneven force. This allows the casing to always maintain a precise verticality and horizontal position during the burial process, laying a solid foundation for subsequent pile foundation construction, significantly improving the accuracy of the pile foundation position, and helping to ensure the stability and safety of the entire engineering structure.

[0031] 6. In the present invention, the wrap-around pulling method of the pull belt is relatively gentle, and compared with some rigid pressing or impact-type burying methods, it can effectively reduce the impact and damage to the casing structure itself; during the sinking process of the casing, the evenly distributed tension of the pull belt can avoid local stress concentration, reduce the risk of deformation and rupture of the casing due to external force, extend the service life of the casing, and reduce construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0033] Figure 1 It is a structural schematic diagram of the full casing of the present invention;

[0034] Figure 2 It is a schematic diagram of the local structure of the sleeve ring of the present invention when it is unfolded;

[0035] Figure 3 It is a schematic diagram of the structure of the dovetail claw of the present invention;

[0036] Figure 4 It is a structural schematic diagram of the hanging rod of the present invention;

[0037] Figure 5 It is a structural schematic diagram of a partial cross-section of the cylinder of the present invention;

[0038] Figure 6 It is a structural schematic diagram of the construction device of the full casing of the present invention;

[0039] Figure 7 It is a schematic diagram of the structure inside the construction device of the full casing of the present invention;

[0040] Figure 8 It is a structural schematic diagram of the bottom of the fixed plate of the present invention;

[0041] Fig. 9 It is a schematic structural diagram of the housing of the present invention;

[0042] Fig.10 It is a structural schematic diagram of the clamping guide wheel of the present invention;

[0043] Fig.11 It is a structural schematic diagram of the winding wheel of the present invention.

[0044] In the figure: 1, cylinder; 2, dovetail claw; 3, driving rod; 4, collar; 5, columnar head; 6, connecting rod; 7, hanging rod; 8, shell; 9, fixed plate; 10, first rotating ring; 11, pressing guide wheel; 12, winding wheel; 13, pulling belt; 14, second rotating ring; 15, driving mechanism; 16, supporting groove wheel; 201, circular block; 301, first U-shaped block; 401, corrugated groove; 601, connecting block; 701, connecting plate; 702, rectangular block; 801, bottom plate; 802, side frame; 803, top plate; 804, columnar block; 805, Spacer; 806, strip-shaped mouth; 101, strip-shaped hole; 102, circular inlay groove; 103, rectangular groove; 1101, first hydraulic cylinder; 1102, U-shaped frame; 1103, arc-shaped mounting shaft; 1201, mounting block; 1202, first bevel gear; 1203, L-shaped plate; 1204, second bevel gear; 1205, driven gear; 1501, motor; 1502, transmission gear; 1503, first gear ring; 1504, second gear ring; 1601, second hydraulic cylinder; 1602, annular support plate; 1603, second U-shaped block. DETAILED DESCRIPTION

[0045] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0046] See also Figures 1 to 11 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0047] The present invention provides a technical solution: a pile foundation full casing for construction of expansive soil and muddy sandstone, comprising a cylinder body 1, wherein a plurality of swingable dovetail claws 2 are arranged at the bottom end wall of the cylinder body 1.

[0048] A circular inlay groove 102 is provided at the end wall at the bottom of the cylinder 1 , a rectangular groove 103 is provided at the top of the circular inlay groove 102 , a circular block 201 is rotatably sleeved on the inner wall of the circular inlay groove 102 , and the outer wall of the bottom of the circular block 201 is exposed to the outside and fixedly connected to the dovetail claw 2 .

[0049] A plurality of driving rods 3 are vertically slidably connected in the wall of the cylinder body 1 to drive the dovetail claw 2 to swing.

[0050] An open groove is formed on the outer wall of the circular block 201 at the rectangular groove 103 , and a connecting rod 6 is rotatably connected to the inner wall of the open groove via a pin shaft. A first U-shaped block 301 is hinged on the top of the connecting rod 6 , and the top surface of the first U-shaped block 301 is fixedly connected to the bottom of the driving rod 3 .

[0051] A plurality of strip holes 101 are formed on the outer wall of the cylinder 1 near the top. A connecting block 601 is fixedly connected to the outer wall of the connecting rod 6 and is slidably connected to the inner wall of the strip hole 101 . The connecting block 601 is fixedly connected to the columnar head 5 .

[0052] The outer wall of the cylinder 1 near the top port is rotatably sleeved with a collar 4, the inner wall of the collar 4 is provided with a corrugated groove 401, the outer wall of the driving rod 3 is installed with a cylindrical head 5, and the outer wall of the cylindrical head 5 is slidably connected with the inner wall of the corrugated groove 401.

[0053] The outer wall of the collar 4 is hinged with a hanging rod 7 , and two ends of the hanging rod 7 are fixedly connected to two connecting plates 701 . A rectangular block 702 is hingedly connected to the side wall between the two connecting plates 701 , and the rectangular block 702 is fixedly connected to the outer wall of the collar 4 .

[0054] A construction device for a pile foundation full casing for construction of expansive soil and muddy sandstone comprises an outer shell 8, which consists of a bottom plate 801, a side frame 802 and a top plate 803; the top surface of the bottom plate 801 is fixedly connected to the side frame 802, the top surface of the side frame 802 is fixedly connected to the top plate 803, and circular holes are provided at the centers of the bottom plate 801 and the top plate 803 for passing the pile foundation full casing; the top surface of the bottom plate 801 is fixedly connected to a plurality of columnar blocks 804, the top of the columnar block 804 is fixedly connected to the bottom of a fixed plate 9; the inner wall of the circular hole of the top plate 803 is fixedly connected to a spacer 805, the outer wall of the spacer 805 near the bottom port is rotatably sleeved on the inner wall at the top port of a first swivel 10, and the top of the top plate 803 is provided with a plurality of strip openings 806 arranged in a circular array.

[0055] A fixed disk 9 is fixedly installed in the outer shell 8, and a first swivel ring 10 is rotatably sleeved on the inner wall of the fixed disk 9; a plurality of first hydraulic cylinders 1101 arranged in a circular array are fixedly connected to the inner wall of the first swivel ring 10, and a U-shaped frame 1102 is fixedly connected to the telescopic end of the first hydraulic cylinder 1101, and a plurality of arc-shaped mounting shafts 1103 are fixedly connected to the inner wall of the U-shaped frame 1102, and a plurality of clamping guide wheels 11 are rotatably sleeved on the outer wall of the arc-shaped mounting shaft 1103, and the outer wall of the clamping guide wheel 11 is rollingly connected to the outer wall of the cylinder 1.

[0056] A plurality of winding wheels 12 arranged in a circular array are installed above the fixed disk 9. A plurality of mounting blocks 1201 arranged in a circular array are fixedly connected to the top surface of the fixed disk 9. A U mounting groove is provided on the top of the mounting block 1201. The winding wheel 12 is located in the U mounting groove. A first connecting shaft is rotatably connected to the side wall of the mounting block 1201. The winding wheel 12 is fixedly sleeved on the outer wall of the first connecting shaft. A first bevel gear 1202 is fixedly connected to one end of the first connecting shaft. An L-shaped plate 1203 is fixedly connected to the side wall of the mounting block 1201. A second connecting shaft is rotatably connected to the side wall of the L-shaped plate 1203. A second bevel gear 1204 and a driven gear 1205 are fixedly connected to the two ends of the second connecting shaft respectively. The second bevel gear 1204 is meshed with the first bevel gear 1202. A pull belt 13 is wound in the winding wheel 12. One end of the pull belt 13 away from the winding wheel 12 is fixedly connected to the hanging rod 7. The pull belt 13 movably passes through the strip opening 806.

[0057] The outer wall of the fixed disk 9 is rotatably sleeved with a second rotating ring 14, and the top end wall of the second rotating ring 14 is provided with teeth meshing with the driven gear 1205; a driving mechanism 15 for driving the first rotating ring 10 and the second rotating ring 14 to rotate is installed in the fixed disk 9.

[0058] The driving mechanism 15 includes a motor 1501 fixedly installed inside the fixed plate 9, the output end shaft of the motor 1501 is connected to a transmission gear 1502, the transmission gear 1502 is meshed with a first gear ring 1503 and a second gear ring 1504, the first gear ring 1503 is fixedly sleeved on the outer wall of the first rotating ring 10, and the second gear ring 1504 is fixedly sleeved on the inner wall of the second rotating ring 14.

[0059] A plurality of support groove wheels 16 arranged in a circular array and capable of being raised and lowered are installed above the housing 8. A plurality of second hydraulic cylinders 1601 arranged in a circular array are fixedly connected to the top surface of the fixed plate 9, and the telescopic end of the second hydraulic cylinder 1601 is movable and vertically passes through the top surface of the housing 8, and a circular support plate 1602 is fixedly connected to the top of the telescopic end, and a plurality of second U-shaped blocks 1603 arranged in a circular array are fixedly connected to the top surface of the circular support plate 1602, and the support groove wheel 16 is rotatably installed inside the second U-shaped block 1603 through a pin shaft, and is used to support the pull belt 13 upward.

[0060] A construction method for a pile foundation full casing for construction in expansive soil and muddy sandstone comprises the following steps:

[0061] S1, installation and fixing of casing:

[0062] First, fix the bottom of the outer shell 8 at the construction site by a suitable method, and then use a crane to lift the pile foundation full casing into the full casing construction device; then, the first hydraulic cylinder 1101 drives the U-shaped frame 1102 to move toward the cylinder body 1, so that several clamping guide wheels 11 clamp the outer wall of the cylinder body 1, thereby stably fixing the casing in the construction device.

[0063] S2, connection and preparation of the pull belt 13:

[0064] A plurality of drawstrings 13 are fixed to the hanging rod 7, and the drawstrings 13 are adjusted to be in a tensioned state, so as to ensure that the subsequent drawstrings 13 can effectively act on the casing.

[0065] S3, casing rotation and sinking drive:

[0066] Start the motor 1501, and the motor 1501 drives the transmission gear 1502 to rotate. Since the transmission gear 1502 is meshed with the first gear ring 1503 and the second gear ring 1504, the first gear ring 1503 and the second gear ring 1504 will rotate synchronously. The first gear ring 1503 rotates to drive the first rotating ring 10 to rotate, thereby causing the cylinder 1 clamped by the plurality of clamping guide wheels 11 to rotate; at the same time, the second gear ring 1504 rotates to drive the second rotating ring 14 to rotate. When the second rotating ring 14 rotates, the teeth on the top end wall thereof drive the driven gear 1205 to rotate, and the driven gear 1205 is sequentially transmitted to the second bevel gear 1204, the first bevel gear 1202 and the winding wheel 12, so that the plurality of winding wheels 12 rotate and wind up the draw belt 13.

[0067] S4, dovetail claw action and casing buried:

[0068] During the winding process, several pull belts 13 pull down the cylinder 1, and the cylinder 1 rotates relative to the ring 4. At this time, the columnar head 5 slides in the corrugated groove 401. Due to the special shape of the corrugated groove 401, the driving rod 3 will make reciprocating movements. The lifting and lowering of the driving rod 3 drives the circular block 201 to reciprocate in the circular inlay groove 102 through the connecting rod 6, thereby driving the dovetail claw 2 to swing. The dovetail claw 2 turns over the soil below it during the swinging process. At the same time, the cylinder 1 gradually descends and rotates into the ground under the combined action of rotation and pulling down; the dovetail claw 2 plays the role of turning over the soil, effectively avoiding jamming, ensuring the smooth rotation of the cylinder 1, and also avoiding damage to the dovetail claw 2 due to jamming.

[0069] S5, pile foundation construction stage:

[0070] When the casing reaches the specified depth, the soil inside the cylinder 1 is dug out by a lifting claw machine, and then construction is carried out according to conventional pile foundation construction technology, such as installation of steel cages, pouring of concrete, etc.

[0071] S6, casing extraction process:

[0072] After the pile foundation construction is completed, the second hydraulic cylinder 1601 drives the annular support plate 1602 upward, and at the same time the winding wheel 12 releases the pulling belt 13, and several supporting groove wheels 16 support the pulling belt 13 upward; at this time, the driving mechanism 15 drives the first rotating ring 10 and the second rotating ring 14 to rotate again at the same time, and several winding wheels 12 wind up the pulling belt 13, then several pulling belts 13 pull the entire casing of the pile foundation upward, and at the same time the cylinder 1 rotates, and the entire casing of the pile foundation is pulled out smoothly.

[0073] Through the above-mentioned pile foundation full casing for expansive soil and muddy sandstone construction and its construction device and construction method, pile foundation construction can be effectively carried out under special geological conditions such as expansive soil and muddy sandstone, the construction efficiency and quality can be improved, and failures and damages during the construction process can be reduced. It has good application prospects and promotion value.

[0074] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A pile foundation full casing for construction of expansive soil and muddy sandstone, comprising a casing (1), characterized in that: A plurality of swingable dovetail claws (2) are installed at the end wall at the bottom of the cylinder (1); a plurality of driving rods (3) are vertically slidably inserted into the cylinder wall of the cylinder (1); the dovetail claws (2) are driven to swing by the lifting and lowering of the driving rods (3); a sleeve (4) is rotatably sleeved on the outer wall of the cylinder (1) near the top port; a corrugated groove (401) is provided on the inner wall of the sleeve (4); a columnar head (5) is installed on the outer wall of the driving rod (3); the outer wall of the columnar head (5) is slidably connected to the inner wall of the corrugated groove (401); and a hanging rod (7) is hinged on the outer wall of the sleeve (4).

2. The full pile foundation casing for construction of expansive soil and muddy sandstone according to claim 1, characterized in that: A circular inlay groove (102) is provided at the end wall at the bottom of the cylinder (1), a rectangular groove (103) is provided at the top of the circular inlay groove (102), a circular block (201) is rotatably sleeved on the inner wall of the circular inlay groove (102), the outer wall of the bottom of the circular block (201) is exposed to the outside, and the outer wall exposed to the outside is fixedly connected to the dovetail claw (2).

3. The full pile foundation casing for construction of expansive soil and muddy sandstone according to claim 2, characterized in that: The outer wall of the circular block (201) located at the rectangular groove (103) is provided with an open groove, and the inner wall of the open groove is rotatably connected to a connecting rod (6) through a pin shaft, and the top of the connecting rod (6) is hinged with a first U-shaped block (301), and the top surface of the first U-shaped block (301) is fixedly connected to the bottom of the driving rod (3); the outer wall of the cylinder (1) near the top is provided with a plurality of strip holes (101), and the outer wall of the connecting rod (6) is fixedly connected to a connecting block (601) that is slidably connected to the inner wall of the strip hole (101), and the connecting block (601) is fixedly connected to the columnar head (5).

4. A pile foundation full casing for construction of expansive soil and muddy sandstone according to claim 1: two connecting plates (701) are fixedly connected to both ends of the hanging rod (7), a rectangular block (702) is hinged on the side wall between the two connecting plates (701), and the rectangular block (702) is fixedly connected to the outer wall of the ring (4).

5. A method for constructing a pile foundation full casing for construction in expansive soil and muddy sandstone, characterized in that: A full casing for pile foundation for construction of expansive soil and muddy sandstone as claimed in any one of claims 1 to 4 is used for construction by means of a full casing construction device, the full casing construction device comprising a shell (8), the inner wall of the shell (8) having a fixed disk (9) fixedly mounted thereon is rotatably sleeved with a first rotating ring (10), the first rotating ring (10) is provided with a plurality of clamping guide wheels (11) for clamping the outer wall of the cylinder (1) and vertically guiding the clamping cylinder (1), the outer wall of the clamping guide wheel (11) is in rolling connection with the outer wall of the cylinder (1), a plurality of rollers arranged in an annular array are installed above the fixed disk (9), and the outer wall of the clamping guide wheel (11) is in rolling connection with the outer wall of the cylinder (1). A winding wheel (12), a drawstring (13) is wound in the winding wheel (12), and one end of the drawstring (13) away from the winding wheel (12) is fixedly connected to the hanging rod (7); a second rotating ring (14) is rotatably sleeved on the outer wall of the fixed disk (9), and the second rotating ring (14) drives the winding wheel (12) to rotate through its rotation, and a driving mechanism (15) for driving the first rotating ring (10) and the second rotating ring (14) to rotate is installed in the fixed disk (9); a plurality of support groove wheels (16) that can be raised and lowered and arranged in a ring array are installed above the shell (8) for supporting the drawstring (13) upward; The construction method steps are as follows: Step 1: fix the bottom of the outer shell (8) at the construction site, use a crane to lift the pile foundation full casing into the full casing construction device, and clamp the outer wall of the cylinder (1) with a plurality of clamping guide wheels (11); Step 2: fix a plurality of drawstrings (13) on the hanging rod (7) and keep the drawstrings (13) in a taut state; Step 3: The driving mechanism (15) drives the first rotating ring (10) and the second rotating ring (14) to rotate simultaneously, so that the cylinder (1) clamped by the plurality of pressing guide wheels (11) rotates, and at the same time, the second rotating ring (14) drives the plurality of winding wheels (12) to rotate, and winds up the draw belt (13); Step 4: a plurality of pull belts (13) pull down the cylinder (1), the cylinder (1) rotates relative to the sleeve (4), the cylindrical head (5) slides in the corrugated groove (401), and the driving rod (3) performs lifting and reciprocating movements; Step 5: The lifting and lowering of the driving rod (3) drives the dovetail claw (2) to swing, turning over the soil below it, and at the same time the cylinder (1) descends and rotates into the ground; Step 6: After reaching the specified depth, the soil inside the cylinder (1) is dug out by a lifting claw machine, and then the pile foundation is constructed; Step seven, after the pile foundation construction is completed; a number of supporting groove wheels (16) prop up the pulling belt (13), the driving mechanism (15) drives the first rotating ring (10) and the second rotating ring (14) to rotate at the same time, and a number of winding wheels (12) wind up the pulling belt (13), and then the number of pulling belts (13) pull the pile foundation casing upward, and at the same time the cylinder body (1) rotates to pull out the pile foundation casing.

6. The method for constructing a pile foundation full casing for construction of expansive soil and muddy sandstone according to claim 5, characterized in that: The shell (8) includes a bottom plate (801), the top surface of the bottom plate (801) is fixedly connected to a side frame (802), the top surface of the side frame (802) is fixedly connected to a top plate (803), and circular holes are provided at the centers of the bottom plate (801) and the top plate (803) for passing through the pile foundation casing; the top surface of the bottom plate (801) is fixedly connected to a plurality of columnar blocks (804), and the top of the columnar blocks (804) is fixedly connected to the bottom of the fixed plate (9); the inner wall of the circular hole of the top plate (803) is fixedly connected to a spacer (805), and the outer wall of the spacer (805) near the bottom port is rotatably sleeved on the inner wall of the top port of the first rotating ring (10); the top of the top plate (803) is provided with a plurality of strip openings (806) arranged in a circular array; the pull belt (13) movably passes through the strip opening (806).

7. The method for constructing a pile foundation full casing for construction of expansive soil and muddy sandstone according to claim 5, characterized in that: The inner wall of the first rotating ring (10) is fixedly connected to a plurality of first hydraulic cylinders (1101) arranged in a circular array, the telescopic end of the first hydraulic cylinder (1101) is fixedly connected to a U-shaped frame (1102), the inner wall of the U-shaped frame (1102) is fixedly connected to a plurality of arc-shaped mounting shafts (1103), and a plurality of the clamping guide wheels (11) are rotatably sleeved on the outer wall of the arc-shaped mounting shaft (1103).

8. The method for constructing a pile foundation full casing for construction of expansive soil and muddy sandstone according to claim 5, characterized in that: The top surface of the fixed disk (9) is fixedly connected to a plurality of mounting blocks (1201) arranged in a circular array, the top of the mounting block (1201) is provided with a U-mounting groove, the winding wheel (12) is located in the U-mounting groove, a first connecting shaft is rotatably connected to the side wall of the mounting block (1201), the winding wheel (12) is fixedly sleeved on the outer wall of the first connecting shaft, one end of the first connecting shaft is fixedly connected to a first bevel gear (1202), the mounting block (1201 ) is fixedly connected to the side wall of the second rotating ring (14), the L-shaped plate (1203), the side wall of the L-shaped plate (1203) is rotatably connected with a second connecting shaft, the two ends of the second connecting shaft are respectively fixedly connected to a second bevel gear (1204) and a driven gear (1205), the second bevel gear (1204) is meshed with the first bevel gear (1202), and the top end wall of the second rotating ring (14) is provided with teeth meshing with the driven gear (1205).

9. The method for constructing a pile foundation full casing for construction of expansive soil and muddy sandstone according to claim 5, characterized in that: The driving mechanism (15) comprises a motor (1501) fixedly mounted inside a fixed disk (9); the output end shaft of the motor (1501) is connected to a transmission gear (1502); the transmission gear (1502) is meshed with a first gear ring (1503) and a second gear ring (1504); the first gear ring (1503) is fixedly sleeved on the outer wall of the first rotating ring (10); and the second gear ring (1504) is fixedly sleeved on the inner wall of the second rotating ring (14).

10. The method for constructing a pile foundation full casing for construction of expansive soil and muddy sandstone according to claim 5, characterized in that: The top surface of the fixed plate (9) is fixedly connected to a plurality of second hydraulic cylinders (1601) arranged in a circular array, the telescopic end of the second hydraulic cylinder (1601) is movable and vertically passes through the top surface of the housing (8), and the top of the telescopic end is fixedly connected to an annular support plate (1602), the top surface of the annular support plate (1602) is fixedly connected to a plurality of second U-shaped blocks (1603) arranged in a circular array, and the support groove wheel (16) is rotatably mounted inside the second U-shaped block (1603) via a pin shaft.

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