A pile foundation construction with a casing

Abstract

The utility model discloses a pile foundation construction is with the protection cylinder, including upper protection cylinder, lower protection cylinder, connecting component and positioning reinforcing component, the upper protection cylinder bottom is equipped with the annular connecting seat, the lower protection cylinder top is equipped with the annular butt joint seat of with the annular connecting seat adaptation, the annular connecting seat with the annular butt joint seat is detachable connection through connecting component, and each group positioning reinforcing component includes adjusting sleeve, telescopic positioning rod and drive part, adjusting sleeve is fixed in the lateral wall of annular connecting seat and its axial perpendicular with the axial direction of annular connecting seat, telescopic positioning rod is along the radial direction of adjusting sleeve and is slidably arranged in adjusting sleeve, drive part is arranged in adjusting sleeve inside and is used for driving telescopic positioning rod back and forth sliding telescopic, the one end of telescopic positioning rod away from the center of adjusting sleeve is equipped with the soil breaking tip, and the one end of adjusting sleeve away from the annular connecting seat is equipped with the telescopic mouth for the soil breaking tip and is worn out.

Description

Technical Field

[0001] This utility model relates to the field of building technology, specifically to a protective casing for pile foundation construction. Background Technology

[0002] In the construction of pile foundations for bridges, buildings, and other engineering projects, especially in areas with karst development and complex geological conditions, it is necessary to place the casing section by section into the foundation pit to meet the construction requirements at different depths. Construction specifications have extremely high requirements for the positioning accuracy of the casing, typically requiring that the plane position of the casing opening deviate from the design by no more than 5 cm and the vertical inclination by no more than 0.5%.

[0003] In existing technologies, positioning sleeves or positioning screws are commonly used to limit and connect adjacent casing sections. A common approach is to use positioning sleeves at the connection points of adjacent casing sections to limit their movement and reduce the risk of displacement. However, in practical applications, it has been found that the positioning sleeves in this approach have a columnar structure, resulting in low stability in their connection with the pit sidewall. When the pit sidewall is under uneven stress or the geological conditions are complex, the positioning sleeves are prone to slippage. This slippage directly leads to a significant reduction in the positioning effect, making it impossible to effectively constrain the relative positions of adjacent casing sections. Ultimately, it is still difficult to prevent casing displacement, which in turn affects the accuracy of pile foundation pouring and may even cause construction safety hazards such as borehole wall collapse. Utility Model Content

[0004] The purpose of this utility model is to provide a casing for pile foundation construction that solves the problems of easy slippage of the positioning sleeve and insufficient positioning effect leading to casing displacement.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A casing for pile foundation construction includes an upper casing, a lower casing, a connecting assembly, and a positioning and reinforcement assembly. The lower casing has an annular connecting seat at its bottom end and an annular mating seat adapted to the annular connecting seat at its top end. The annular connecting seat and the annular mating seat are detachably connected by the connecting assembly. The positioning and reinforcement assembly includes several groups evenly distributed along the circumference of the annular connecting seat. Each group of the positioning and reinforcement assembly includes an adjusting sleeve, a telescopic positioning rod, and a driving component. The adjusting sleeve is fixed to the side wall of the annular connecting seat and its axial direction is perpendicular to the axial direction of the annular connecting seat. The telescopic positioning rod slides through the adjusting sleeve radially. The driving component is disposed inside the adjusting sleeve and is used to drive the telescopic positioning rod to slide back and forth. The end of the telescopic positioning rod away from the center of the adjusting sleeve has a soil-breaking tip, and the end of the adjusting sleeve away from the annular connecting seat has a telescopic opening for the soil-breaking tip to pass through.

[0007] Preferably, the connecting assembly includes at least two sets evenly distributed circumferentially along the central axis of the casing. Each set of the connecting assembly includes a quick-release latch and a latch seat. The latch seat is disposed on the outer wall of the annular docking seat, and the quick-release latch is disposed on the outer wall of the annular connecting seat and engages with the latch seat.

[0008] Preferably, the top of the annular docking seat is provided with a positioning hole, and the bottom of the annular connecting seat is provided with a positioning pin that is inserted into the positioning hole.

[0009] Preferably, the driving component includes an adjusting knob, a driving bevel gear, a driven bevel gear, and a transmission screw. The top end of the adjusting sleeve has an installation port. The adjusting knob is rotatably mounted at the installation port via a deep groove ball bearing. The driving bevel gear is coaxially fixedly connected to the adjusting knob and located inside the adjusting sleeve. The transmission screw is rotatably mounted inside the adjusting sleeve along the axial direction of the adjusting sleeve via bearing seats at both ends. The driven bevel gear is coaxially fixedly connected to the transmission screw and meshes with the driving bevel gear. A threaded sleeve is fixedly provided on the side wall of the telescopic positioning rod near the center of the adjusting sleeve. A connecting nut that is threadedly connected to the transmission screw is embedded in the threaded sleeve.

[0010] Preferably, a guide slide rod parallel to the transmission screw is fixedly provided inside the adjusting sleeve and on the left and right sides of the telescopic positioning rod, and a guide slide sleeve is fixedly provided on the telescopic positioning rod, and the guide slide sleeve is slidably sleeved on the guide slide rod.

[0011] Preferably, the telescopic positioning rod has scale lines on its side wall along its length, the adjusting sleeve has an observation window on its side wall, and a transparent protective plate is provided at the observation window.

[0012] Preferably, the end of the adjusting sleeve away from the annular connecting seat is provided with a tapered guide head, and the telescopic port passes through the tapered guide head radially.

[0013] Preferably, a sealing buffer layer is provided between the annular connecting seat and the annular docking seat.

[0014] Preferably, the inner walls of both the upper and lower protective sleeves are provided with anti-corrosion and wear-resistant layers.

[0015] By adopting the above technical solution, this utility model has the following advantages compared with the prior art:

[0016] 1. This utility model provides a casing for pile foundation construction. Through multiple sets of positioning and reinforcement components evenly distributed along the circumference, a balanced radial support force can be provided to the casing from multiple directions. The telescopic positioning rod is horizontally inserted into the soil of the side wall of the foundation pit under the action of the driving component. Combined with the soil-breaking tip at its front end, it provides an anchoring force far exceeding the surface friction, effectively avoiding the disadvantage of easy slippage of positioning components in the traditional method, and greatly ensuring the verticality and planar position accuracy of the casing. It is particularly suitable for complex geological conditions where deviation is prone to occur.

[0017] 2. This utility model provides a casing for pile foundation construction. The connecting component adopts a combination of positioning pin and positioning hole for pre-positioning and quick-release lock and lock seat for main locking. This realizes the rapid centering of adjacent casings and tool-free disassembly and assembly, eliminating the complicated bolt tightening operation, greatly reducing the labor intensity of operators, significantly improving construction efficiency, and facilitating the repeated reuse of casings.

[0018] 3. This utility model provides a casing for pile foundation construction. The driving component adopts a gear and screw transmission mechanism, which smoothly and accurately converts the rotational motion into the linear motion of the telescopic positioning rod. This transmission method has a large torque output, good self-locking performance, and high adjustment accuracy, which completely solves the problem of easy jamming when the mechanical direct drive is used. The operator can intuitively control the extension length of each telescopic positioning rod through the observation window and scale line, so as to easily adapt to foundation pits of different diameters. It has extremely strong versatility and flexibility. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a cross-sectional view of the connecting component of this utility model;

[0021] Figure 3 This is a schematic diagram of the positioning and reinforcement component structure of this utility model;

[0022] Figure 4 This is a cross-sectional view of the positioning and reinforcement component of this utility model;

[0023] Figure 5 This is a schematic diagram of the drive component structure of this utility model.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Upper casing; 2. Lower casing; 3. Connecting assembly; 4. Positioning and reinforcing assembly; 11. Annular connecting seat; 21. Annular docking seat; 31. Quick-release lock; 32. Lock seat; 33. Positioning pin; 34. Positioning hole; 41. Adjusting sleeve; 42. Telescopic positioning rod; 43. Driving component; 44. Conical guide head; 45. Guide slide rod; 46. Guide slide sleeve; 411. Observation window; 421. Soil-breaking tip; 422. Scale line; 423. Threaded sleeve; 424. Connecting nut; 431. Adjusting knob; 432. Driving bevel gear; 433. Driven bevel gear; 434. Transmission screw; 435. Deep groove ball bearing; 436. Bearing seat; 8. Sealing buffer layer. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model 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 merely illustrative of the present utility model and are not intended to limit the present utility model.

[0027] It should be noted that in this utility model, the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", and "outer" are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element of this utility model must have a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0028] Example

[0029] Please refer to Figures 1 to 5 As shown, this utility model discloses a casing for pile foundation construction, including an upper casing 1, a lower casing 2, a connecting component 3, and a positioning and reinforcement component 4. An annular connecting seat 11 is welded and fixed to the bottom end of the upper casing 1, and an annular docking seat 21 adapted to the annular connecting seat 11 is welded and fixed to the top end of the lower casing 2. The annular connecting seat 11 and the annular docking seat 21 are detachably connected through the connecting component 3.

[0030] The connecting assembly 3 includes quick-release latches 31, latch seats 32, positioning pins 33, and positioning holes 34. At the top of the annular docking seat 21, four blind holes are evenly spaced circumferentially as positioning holes 34. Correspondingly, at the bottom of the annular connecting seat 11, four conical positioning pins 33 are integrally formed, each corresponding to and fitting one-to-one with the positioning holes 34. On the outer wall of the annular docking seat 21, four latch seats 32 are also evenly welded circumferentially. On the outer wall of the annular connecting seat 11, four quick-release latches 31, each corresponding to one-to-one with the latch seats 32, are fixedly installed with bolts. These quick-release latches 31 are common eccentric latch-type quick-locking mechanisms in the prior art (not shown in the figure).

[0031] The positioning and reinforcement assembly 4 includes four sets evenly distributed around the annular connecting seat 11. Each set of positioning and reinforcement assembly 4 includes an adjusting sleeve 41, a telescopic positioning rod 42 and a set of driving components 43.

[0032] The adjusting sleeve 41 is a cylindrical steel component, which is horizontally and radially fixed on the side wall of the annular connecting seat 11 by welding, that is, its axial direction is perpendicular to the axial direction of the upper protective sleeve 1. The end of the adjusting sleeve 41 away from the annular connecting seat 11 is processed into a conical guide head 44. The conical guide head 44 is integrally formed with the adjusting sleeve 41 and is used to reduce resistance when in contact with the soil layer. The end of the conical guide head 44 is provided with a telescopic opening for the telescopic positioning rod 42 to pass through.

[0033] The telescopic positioning rod 42 is a high-strength alloy steel rod. One end of it, furthest from the center of the adjusting sleeve 41, is machined with a sharp, ground-breaking tip 421 to facilitate penetration of hard soil layers. Precise graduation lines 422 are laser-engraved along the length of the rod's side wall. Corresponding to these graduation lines 422, a rectangular observation window 411 is opened on the side wall of the adjusting sleeve 41. This observation window 411 is fitted with a transparent tempered glass plate as a protective layer, facilitating observation while preventing the entry of mud and sand.

[0034] The driving component 43 is used to precisely drive the radial extension and retraction of the telescopic positioning rod 42. It includes an adjusting knob 431, a driving bevel gear 432, a driven bevel gear 433, and a transmission screw 434. The top end of the adjusting sleeve 41 has a mounting port, and the adjusting knob 431 is rotatably mounted at the mounting port via a deep groove ball bearing 435. The driving bevel gear 432 is located inside the adjusting sleeve 41 and is coaxially fixedly connected to the rotating shaft of the adjusting knob 431 via a flat key.

[0035] The transmission screw 434 is rotatably mounted inside the adjusting sleeve 41 along its axial direction via bearing seats 436 at both ends. The driven bevel gear 433 is coaxially fixed to the transmission screw 434 via a flat key and meshes with the driving bevel gear 432, forming a bevel gear transmission pair. A threaded sleeve 423 is fixed to the side wall of the telescopic positioning rod 42 near the center of the adjusting sleeve 41. A connecting nut 424, which is threadedly connected to the transmission screw 434, is embedded in the threaded sleeve 423.

[0036] Inside the adjusting sleeve 41, on the left and right sides of the telescopic positioning rod 42, a guide slide rod 45 parallel to the transmission screw 434 is fixedly installed. A guide slide sleeve 46 is fixedly installed on the telescopic positioning rod 42 accordingly. The guide slide sleeve 46 is slidably sleeved on the guide slide rod 45 to form a sliding pair, thereby ensuring that the telescopic positioning rod 42 can only perform linear telescopic movement and will not rotate.

[0037] The casing used in this embodiment for pile foundation construction is suitable for pile foundation construction scenarios with complex geological conditions such as karst areas. It is used to ensure the verticality, stability, and construction efficiency of the casing installation. To further improve the sealing and vibration resistance of the connection, a sealing buffer layer 8 is fixed to the top of the annular docking seat 21 with adhesive. This sealing buffer layer 8 is made of an oil-resistant and aging-resistant elastic rubber material (such as nitrile rubber). When the upper casing 1 and the lower casing 2 are connected, the sealing buffer layer 8 is tightly pressed between the top of the annular docking seat 21 and the bottom of the annular connecting seat 11, which can prevent mud leakage and buffer the vibration impact during construction.

[0038] Both the upper casing 1 and the lower casing 2 are cylindrical steel cylinders, and their inner walls are coated with an anti-corrosion and wear-resistant layer through a spraying process. This anti-corrosion and wear-resistant layer is an epoxy resin coating, which is used to resist the wear of underground corrosive media and concrete pouring, and to extend the service life of the casing.

[0039] The working principle and process of this embodiment are as follows:

[0040] During construction, the lower casing 2 is first hoisted and placed into the foundation pit. Then, the upper casing 1 is hoisted up, and its bottom positioning pin 33 is aligned with the positioning hole 34 at the top of the lower casing 2 before being slowly lowered. After the positioning pin 33 is inserted into the positioning hole 34, the upper casing 1 and the lower casing 2 are quickly pre-positioned and aligned, effectively preventing circumferential misalignment.

[0041] After pre-positioning, the operator sequentially flips the four quick-release latches 31 to engage and lock them with the corresponding latch seats 32, thereby firmly connecting the annular connecting seat 11 and the annular docking seat 21 together. The entire process requires no tools and is quick and reliable.

[0042] After the casing is connected, positioning and reinforcement are carried out. By lowering or adjusting the position of the entire upper casing 1, the conical guide head 44 at the end of the adjusting sleeve 41, which is horizontally welded to the side wall of its annular connecting seat 11, is pressed against and aligned with the side wall of the pit. Then, under the weight of the casing or a slight external impact, the conical guide head 44 is initially pressed into the soil of the pit side wall, achieving initial positioning.

[0043] Subsequently, the adjusting knobs 431 on the four positioning and reinforcement components 4 are rotated in sequence. The rotational motion is transmitted to the driven bevel gear 433 through the driving bevel gear 432, thereby driving the transmission screw 434 to rotate. The rotation of the transmission screw 434 is converted into the linear motion of the telescopic positioning rod 42 through the threaded engagement with the connecting nut 424 on the threaded sleeve 423. Due to the constraint of the guide sleeve 46 and the guide rod 45, the telescopic positioning rod 42 extends smoothly outward along the radial direction of the adjusting sleeve 41, and its front end breaking point 421 penetrates from the telescopic port and penetrates into the soil around the foundation pit until it provides sufficient support.

[0044] During this process, the operator can read the scale line 422 on the telescopic positioning rod 42 through the observation window 411, and precisely control the extension length of the four sets of telescopic positioning rods 42 to be consistent, thereby ensuring that the casing is subjected to uniform radial support force, and ultimately ensuring that its vertical tilt is not greater than the design requirement of 0.5%.

[0045] During disassembly, rotating the adjustment knob 431 in the opposite direction will retract the telescopic positioning rod 42 into the adjustment sleeve 41. Opening the quick-release lock 31 will allow the upper protective sleeve 1 to be lifted off for the next section of construction or reuse.

[0046] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A casing for pile foundation construction, characterized in that: The device includes an upper casing, a lower casing, a connecting assembly, and a positioning and reinforcement assembly. The bottom end of the upper casing is provided with an annular connecting seat, and the top end of the lower casing is provided with an annular mating seat adapted to the annular connecting seat. The annular connecting seat and the annular mating seat are detachably connected by the connecting assembly. The positioning and reinforcement assembly includes several groups evenly distributed along the circumference of the annular connecting seat. Each group of the positioning and reinforcement assembly includes an adjusting sleeve, a telescopic positioning rod, and a driving component. The adjusting sleeve is fixed to the side wall of the annular connecting seat and its axial direction is perpendicular to the axial direction of the annular connecting seat. The telescopic positioning rod slides through the adjusting sleeve radially. The driving component is disposed inside the adjusting sleeve and is used to drive the telescopic positioning rod to slide back and forth. The end of the telescopic positioning rod away from the center of the adjusting sleeve is provided with a soil-breaking tip, and the end of the adjusting sleeve away from the annular connecting seat is provided with a telescopic opening for the soil-breaking tip to pass through.

2. The casing for pile foundation construction as described in claim 1, characterized in that: The connecting components include at least two sets evenly distributed circumferentially along the central axis of the casing. Each set of the connecting components includes a quick-release latch and a latch seat. The latch seat is disposed on the outer wall of the annular docking seat, and the quick-release latch is disposed on the outer wall of the annular connecting seat and engages with the latch seat.

3. The casing for pile foundation construction as described in claim 1, characterized in that: The top of the annular docking seat is provided with a positioning hole, and the bottom of the annular connecting seat is provided with a positioning pin that is inserted into the positioning hole.

4. A casing for pile foundation construction as described in claim 1, characterized in that: The driving component includes an adjustment knob, a driving bevel gear, a driven bevel gear, and a transmission screw. The top of the adjustment sleeve has an installation port. The adjustment knob is rotatably mounted at the installation port via a deep groove ball bearing. The driving bevel gear is coaxially fixedly connected to the adjustment knob and located inside the adjustment sleeve. The transmission screw is rotatably mounted inside the adjustment sleeve along the axial direction of the adjustment sleeve via bearing seats at both ends. The driven bevel gear is coaxially fixedly connected to the transmission screw and meshes with the driving bevel gear. A threaded sleeve is fixedly provided on the side wall of the telescopic positioning rod near the center of the adjustment sleeve. A connecting nut that is threadedly connected to the transmission screw is embedded in the threaded sleeve.

5. A casing for pile foundation construction as described in claim 4, characterized in that: Inside the adjusting sleeve and on the left and right sides of the telescopic positioning rod, a guide slide rod parallel to the transmission screw is fixedly installed. A guide sleeve is fixedly installed on the telescopic positioning rod, and the guide sleeve is slidably sleeved on the guide slide rod.

6. A casing for pile foundation construction as described in claim 1, characterized in that: The telescopic positioning rod has scale lines along its length on its side wall, and the adjusting sleeve has an observation window on its side wall, with a transparent protective plate at the observation window.

7. A casing for pile foundation construction as described in claim 1, characterized in that: The adjusting sleeve has a tapered guide head at one end away from the annular connecting seat, and the telescopic port passes through the tapered guide head radially.

8. A casing for pile foundation construction as described in claim 1, characterized in that: A sealing buffer layer is provided between the annular connecting seat and the annular docking seat.

9. A casing for pile foundation construction as described in claim 1, characterized in that: The inner walls of both the upper and lower protective casings are provided with anti-corrosion and wear-resistant layers.

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