Prefabricated tubular pile for rotary construction
By setting prestressed threaded steel bars and spiral stirrups in prefabricated pipe piles and using rotary drilling method, the problems of vibration and noise pollution in the existing prefabricated pipe pile construction methods are solved, and the effects of fast construction speed, low cost and strong torsional resistance are achieved.
Patent Information
- Application Number
- CN202421824238.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-31
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2034-07-31
AI Technical Summary
The existing prefabricated pipe pile construction methods such as hammering method, static pressure method and implantation method have problems such as vibration, noise pollution, unstable pile body quality, high equipment cost, and complex processes.
Prefabricated pipe piles are drilled into the soil by setting prestressed threaded steel bars and spiral stirrups in the concrete pile body and spiral blades on the top and bottom of the pile body by rotary drilling.
It reduces the damage to the pile body caused by construction vibration, noise pollution and pile hammer impact force, improves construction speed and cost-effectiveness, and enhances the torsional resistance and vertical bearing capacity of the pile body.
Smart Images
Figure CN222822248U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of civil engineering, in particular to a prefabricated pipe pile of rotary construction. Background Art
[0002] In recent years, my country has vigorously advocated green buildings and prefabricated structures. Among them, prefabricated pipe piles are widely used in various projects in my country due to their many advantages such as standardized factory production, fast construction speed, green environmental protection, no construction waste, and little impact of climate on construction. For example, they are used in the foundations of industrial and civil buildings and municipal highway bridges, support of roadbed slopes and foundation pits, and bridgehead foundation treatment.
[0003] Existing prefabricated pipe piles generally use mixed reinforced prestressed pipe piles or prestressed high-strength concrete pipe piles. Commonly used construction methods for prefabricated pipe piles include hammering, static pressure, and implantation, among which hammering is the most widely used.
[0004] Prefabricated pipe piles constructed by hammering are driven into the soil by the impact force of a diesel hammer or hydraulic hammer. Hammering construction will cause significant vibration and noise pollution, disturb the natural environment and buildings nearby, and have an inevitable impact on the lives of nearby residents and wild animals. In addition, the impact force of the pile hammer will cause certain damage to the pile body. In severe cases, vertical micro-cracks will appear in the pile body or even the pile head will be broken.
[0005] Prefabricated pipe piles constructed by static pressure method are gradually pressed into the soil under the action of deadweight and static pressure of the counterweight by adding counterweight to the top of the pile. Although static pressure method solves the problems of vibration, noise and unstable pile quality caused by hammer method, it requires a large counterweight, and the counterweight and pile driving equipment are relatively large. The transportation and moving costs of the equipment are high, and the pile construction speed is slow.
[0006] Prefabricated pipe piles constructed by implantation method are first drilled at the pile position and grouting is injected into the hole, and then the prefabricated pipe piles are implanted into the hole. Although implantation method can also solve the problems of vibration, noise and unstable pile quality caused by hammering method, its process is complicated, the construction period is long, pre-drilling increases the machinery cost, and the grout in the hole increases the material cost. Summary of the invention
[0007] In view of the above problems, the utility model provides a prefabricated pipe pile for rotary construction, which can specifically adopt the following technical solutions:
[0008] The rotary constructed prefabricated pipe pile described in the utility model comprises a concrete pile body of a hollow columnar structure prefabricated by a centrifugal method, wherein prestressed threaded steel bars are arranged in the concrete pile body, the prestressed threaded steel bars are arranged vertically and evenly spaced along one of the concentric circles of the concrete pile body, and spiral stirrups are welded on the outer side of the prestressed threaded steel bars; an upper end plate connected to the anchor is arranged on the top of the concrete pile body, and bolt holes for connecting the propulsion equipment are opened on the upper end plate; a lower end plate connected to the anchor is arranged on the bottom of the concrete pile body, and a steel pile tip is arranged on the lower end plate; at least one steel sleeve is arranged in the middle of the concrete pile body, the surface of the steel sleeve is flush with the outer diameter of the concrete pile body, and each steel sleeve is provided with a first spiral blade; a second spiral blade is arranged on the steel pile tip.
[0009] The concrete pile body is made of high-strength concrete or steel fiber concrete, and the steel sleeve is prefabricated integrally with the concrete pile body.
[0010] The spiral stirrups are arranged on the prestressed threaded steel bars in a double-limbed and side-by-side winding manner at the upper part of the concrete pile body.
[0011] Anchor steel bars extending into the concrete pile body are welded on the bottom surface of the upper end plate and the top surface of the lower end plate.
[0012] The steel pile tip is made of a conical steel plate, the bottom diameter of which is equal to the diameter of the lower end plate, and is connected to the lower end plate by welding or screwing.
[0013] The first spiral blade is composed of a single-pitch spiral steel plate welded on a steel sleeve, and the pitch of the first spiral blade is smaller than the height of a single steel sleeve.
[0014] The diameter of the second spiral blade gradually decreases from top to bottom.
[0015] The prefabricated pipe piles for rotary construction provided by the utility model have a stable pile body structure and strong torsion resistance. Spiral blades are arranged on the outer side and the bottom pile tip, so that the pipe piles can be drilled into the soil body by rotary drilling, which can not only greatly reduce the vibration and noise pollution caused by the construction and the damage to the pile body caused by the impact force of the pile hammer, but also has a simple construction process, fast construction speed, low cost and high bearing capacity, reflecting the green construction concept of safety, economy, comfort, environmental protection and civilization. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a structural schematic diagram of the utility model.
[0017] Figure 2 yes Figure 1 Cross-sectional view in .
[0018] Figure 3 yes Figure 1 Schematic diagram of the structure of the middle and upper end plate.
[0019] Figure 4 yes Figure 2 AA cross-section diagram. DETAILED DESCRIPTION
[0020] The following is a detailed description of an embodiment of the utility model in conjunction with the accompanying drawings. This embodiment is implemented on the premise of the technical solution of the utility model, and a detailed implementation method and a specific construction process are given, but the protection scope of the utility model is not limited to the following embodiment.
[0021] like Figure 1-4 As shown, the rotary constructed prefabricated pipe pile described in the utility model includes a concrete pile body 1 of a hollow columnar structure, which is prefabricated in a factory by a centrifugal method using high-strength concrete or steel fiber concrete with a steel fiber volume ratio of 0.5% to 2%. A plurality of prestressed threaded steel bars 2 are embedded in the above-mentioned concrete pile body 1. The prestressed threaded steel bars 2 are vertically arranged and evenly spaced along one of the concentric circles of the concrete pile body 1. Spiral stirrups 3 are welded to the outside of the prestressed threaded steel bars 2. Normally, the spiral stirrups 3 are welded to the prestressed threaded steel bars 2 in a double-limbed side-by-side winding manner at the upper part of the concrete pile body 1 to enhance the torsional resistance of the pile body.
[0022] The top of the concrete pile body 1 is provided with an upper end plate 4 connected to the concrete pile body by anchoring, and the bottom is provided with a lower end plate 5 connected to the concrete pile body by anchoring. Specifically, anchoring steel bars 6 extending into the concrete pile body are welded on the bottom surface of the upper end plate 4 and the top surface of the lower end plate 5. The upper end plate 4 is provided with bolt holes 41 for connecting the propulsion equipment, and the bolt holes 41 are usually multiple; the lower end plate 5 is connected with a steel pile tip 7. The steel pile tip 7 is made of a conical steel plate, and the bottom diameter thereof is equal to the diameter of the lower end plate 5, and is connected to the lower end plate 5 by welding or screwing.
[0023] At least one steel sleeve 8 is provided in the middle of the concrete pile body 1, the surface of the steel sleeve 8 is flush with the outer diameter of the concrete pile body 1, and each steel sleeve 8 is welded with a one-stage or multi-stage first spiral blade 9. The first spiral blade 9 is made of a single-pitch spiral steel plate, and its pitch is less than the height of a single steel sleeve 8. The steel pile tip 7 is welded with a one-stage or multi-stage second spiral blade 10, and the diameter of the second spiral blade 10 gradually decreases from top to bottom.
[0024] During construction, the rotating head of the pile-making machine is connected to the pile body 1 through the bolt hole 41, and then pressure and torque are applied to screw the pipe pile into place.
[0025] The above-mentioned method of drilling the prefabricated pipe pile into the soil by rotary drilling avoids the vibration, noise pollution and damage to the pile body caused by the impact force of the pile hammer caused by the conventional hammering method, reduces the disturbance to the nearby natural environment and buildings, reduces the impact on the lives of nearby residents and wild animals, and improves the integrity of the pile body. It also avoids the problems of complex construction procedures, long construction period and high cost of static pressure method and implantation method. Moreover, the steel spiral blades set in the prefabricated pipe pile structure of the utility model can greatly improve the vertical bearing capacity of the pipe pile, reflecting the green construction concept of safety, economy, comfort, environmental protection and civilization. In addition, considering that the pile body of the pipe pile needs to withstand a large torque during spiral drilling, the utility model also takes measures to improve the torsion resistance of the pile body to ensure the force safety of the pile body itself.
[0026] It should be noted that, in the description of the present invention, terms indicating orientation or positional relationships, such as "front", "rear", "left", "right", "vertical", "horizontal", "inside", "outside", "up", "down", etc., are based on the orientation or positional relationships shown in the drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
Claims
1. A prefabricated pipe pile for rotary construction, characterized in that: It comprises a concrete pile body of a hollow columnar structure prefabricated by a centrifugal method, wherein prestressed threaded steel bars are arranged in the concrete pile body, the prestressed threaded steel bars are arranged vertically and evenly spaced along one of the concentric circles of the concrete pile body, and spiral stirrups are welded on the outer side of the prestressed threaded steel bars; an upper end plate connected to the concrete pile body with an anchor is arranged on the top of the concrete pile body, and bolt holes for connecting the propulsion equipment are opened on the upper end plate; a lower end plate connected to the anchor is arranged on the bottom of the concrete pile body, and a steel pile tip is arranged on the lower end plate; at least one steel sleeve is arranged in the middle of the concrete pile body, the surface of the steel sleeve is flush with the outer diameter of the concrete pile body, and each steel sleeve is provided with a first spiral blade; a second spiral blade is arranged on the steel pile tip.
2. The prefabricated pipe pile for rotary construction according to claim 1 is characterized in that: The concrete pile body is made of high-strength concrete or steel fiber concrete, and the steel sleeve is prefabricated integrally with the concrete pile body.
3. The prefabricated pipe pile for rotary construction according to claim 1 is characterized in that: The spiral stirrups are arranged on the prestressed threaded steel bars in a double-limbed and side-by-side winding manner at the upper part of the concrete pile body.
4. The prefabricated pipe pile for rotary construction according to claim 1 is characterized in that: Anchor steel bars extending into the concrete pile body are welded on the bottom surface of the upper end plate and the top surface of the lower end plate.
5. The rotary prefabricated pipe pile according to claim 1, characterized in that: The steel pile tip is made of a conical steel plate, the bottom diameter of which is equal to the diameter of the lower end plate, and is connected to the lower end plate by welding or screwing.
6. The prefabricated pipe pile for rotary construction according to claim 1, characterized in that: The first spiral blade is composed of a single-pitch spiral steel plate welded on a steel sleeve, and the pitch of the first spiral blade is smaller than the height of a single steel sleeve.
7. The rotary prefabricated pipe pile according to claim 1, characterized in that: The diameter of the second spiral blade gradually decreases from top to bottom.