Centering structure for drilling and pile planting
By using a centering structure composed of a guard and steel plate in the drilling pile planting, the problem of inclination and edge recession when lowering is solved, efficient centering positioning is achieved, significantly improving the verticality of the pipe pile and the pass rate of pile position deviation, and ensuring the vertical bearing capacity of the single pile.
Patent Information
- Application Number
- CN202421940436.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-12
- Publication Date
- 2025-05-23
- Estimated Expiration
- 2034-08-12
AI Technical Summary
During the drilling and pile planting process, the pipe piles are prone to tilt and lean against the edge when they are lowered into the hole, resulting in the verticality of the pipe piles not meeting the requirements, affecting the bearing capacity and pile position deviation.
A centering structure is adopted, including a casing and at least three steel plates. The steel plate is provided with a hanging groove. The steel plate is hung on the casing through the hanging groove to form a circumference concentric with the casing. The pipe piles are placed down into the drilling hole through the circumference to achieve centering positioning.
Through this centering structure, the verticality pass rate of the pipe pile can reach 97%, and the pile position deviation pass rate can reach 99%, which significantly improves the centering effect, improves the vertical bearing capacity of a single pile, and avoids quality problems such as pile position deviation exceeding the specification.
Smart Images
Figure CN222893630U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of drilling piles, in particular to a centering structure for drilling piles. Background Art
[0002] Pile foundation is a foundation form with high bearing capacity, wide application range and long history. It is widely used in high-rise buildings, ports, bridges and other projects. It is the most widely used deep foundation form. Pile foundation can be divided into two categories according to the construction method: cast-in-place piles and precast piles. Precast piles include wooden piles, steel piles, pipe piles, etc. Among them, pipe piles are the most widely used. The construction method is generally hammering and static pressure. Precast piles are increasingly widely used in the market due to their advantages such as visible and controllable quality, low cost, short construction period and clean site.
[0003] In recent years, the emergence of bored pile technology has overcome many geological limitations and has been gradually widely used throughout the country. Drilled piles mainly form pile holes underground by drilling, and then pour concrete or insert prefabricated pile bodies in the holes to form pile foundations. Among them, when inserting prefabricated pile bodies, most bored piles adopt a method in which the hole diameter is larger than the pile diameter. When the pipe pile is lowered into the hole, it is easy to tilt and lean against the side, that is, it is difficult to form concentric circles between the pipe pile and the pile hole (hereinafter referred to as centering). This causes the verticality of the pipe pile to fail to meet the requirements, resulting in insufficient bearing capacity of the pipe pile, the pipe pile and the filling material around the pile cannot be evenly wrapped so that the pipe pile cannot be effectively constrained, and the bottom of the pipe pile cannot reach the bottom of the hole to form a hanging pile when inserted into the hole side, and the pile position deviation exceeds the specifications and design requirements. In addition, in the actual construction process, the construction unit, considering the construction cost and construction efficiency issues, mostly did not take centering measures to solve the above problems. Utility Model Content
[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a centering structure for pile drilling to solve the problem that during the pile drilling process, the pipe pile is prone to tilt and lean against the side when lowered into the hole, causing the verticality of the pipe pile to fail to meet the requirements.
[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:
[0006] A centering structure for drilling piles comprises a casing and at least three steel plates. The steel plates are provided with hanging grooves with one end open and the other end closed. The steel plates are hung on the upper end of the casing from top to bottom through the hanging groove openings at intervals from each other so that a part of the steel plates is located in the casing. The part of the steel plate located in the casing has a positioning edge parallel to the axis of the casing; all the positioning edges are located on the circumference of the same circle concentric with the casing; the diameter of the pipe pile is smaller than the diameter of the circle and is located within the circumference.
[0007] Furthermore, the hanging groove is rectangular, and its width matches the wall thickness of the casing.
[0008] Furthermore, the steel plates inside and outside the casing are both rectangular.
[0009] Furthermore, the length L of the portion of the steel plate located in the casing, the diameter difference D between the circle and the pile, and the verticality requirement P satisfy D / L <P。
[0010] Furthermore, the width of the portion of the steel plate located inside the casing is greater than the width of the portion located outside the casing.
[0011] Furthermore, the thickness of the steel plate is 20 mm.
[0012] Furthermore, the diameter difference D between the circle and the pipe pile is less than 20 mm.
[0013] Compared with the prior art, the utility model has the following beneficial effects:
[0014] 1. The utility model realizes the centering of the pipe pile through the cooperation of the casing and the steel plate. When centering the pipe pile, at least three steel plates are hung on the upper end of the casing at intervals, and a circumference is determined by the positioning edges of at least three steel plates. Then the pipe pile is lowered into the borehole through the circumference, thereby positioning the pipe pile in the center of the borehole. The diameter of the circumference is only slightly larger than the diameter of the pipe pile, which can ensure that the pipe pile can smoothly enter the circumference, and is equivalent to reducing the diameter of the original borehole to make it closer to the diameter of the pipe pile than before the improvement, thereby avoiding excessive tilting or leaning against the side of the pipe pile during installation and lowering, so that the verticality and pile position deviation of the pipe pile exceed the specification requirements. After each pile position is constructed, the steel plate is directly removed and hung on the next pile position for continued use. It is easy to operate, has low recycling cost, high construction efficiency, and high safety.
[0015] 2. The utility model steel plate has a simple structure, small size and low production cost. When in use, the steel plate can be used by simply hanging it on the casing, which is easy to operate and has high construction efficiency. The steel plate is taken out after the construction is completed, and it plays a role throughout the whole process, with good centering effect. In addition, the steel plate can be installed before the pile driver is in place, and no manual operation is required during the lifting and sinking of the pile driver, which is safer. And because the steel plate is directly hung on the casing, it can be directly replaced if it is damaged, with low maintenance frequency, low difficulty and long service life.
[0016] 3. When the centering structure of the utility model is used to center the pipe piles, the qualified rate of verticality of the pipe piles can reach 97%, and the qualified rate of pile position deviation can reach 99%. When no auxiliary measures are taken for centering, the qualified rate of verticality is less than 50%, and the qualified rate of pile position deviation is about 80%. It can be seen that the centering structure of the utility model can significantly improve the centering effect, thereby ensuring the vertical and axial force of the pipe piles, achieving uniform and effective wrapping of the pile surrounding filler within the entire length of the pipe pile, achieving better joint force and improving the vertical bearing capacity of the single pile, and avoiding quality problems such as the pipe pile bottom not being able to reach the bottom of the hole when inserted into the hole, forming a hanging pile, and the pile position deviation exceeding the specifications and design requirements. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic cross-sectional structure diagram of the centering structure for drilling piles of the utility model;
[0018] Figure 2 It is a schematic diagram of the top view of the centering structure for drilling piles of the utility model;
[0019] Figure 3 The utility model is a construction flow chart for centering the centering structure.
[0020] In the figure, there are casing 1, steel plate 2, and pipe pile 3. DETAILED DESCRIPTION
[0021] The utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0022] like Figure 1-2 As shown, a centering structure for drilling piles includes a casing 1 and at least three steel plates 2, wherein the steel plates 2 are provided with hanging grooves with one end open and the other end closed, and the steel plates 2 are hung on the upper end of the casing 1 from top to bottom through the hanging groove openings at intervals from each other so that a part of the steel plates 2 is located in the casing 1, and the part of the steel plates 2 located in the casing 1 has a positioning edge parallel to the axis of the casing 1; all the positioning edges are located on the circumference of the same circle concentric with the casing 1; the diameter of the pipe pile 3 is smaller than the diameter of the circle and is located within the circumference.
[0023] When centering the pipe pile 3 of the present utility model, at least three steel plates 2 are hung on the upper end of the casing 1 at intervals. A circumference is determined by the positioning edges of at least three steel plates 2, and then the pipe pile 3 is lowered into the drilling hole through this circumference, so as to position the pipe pile 3 at the center position of the drilling hole. The diameter of this circumference is only slightly larger than the diameter of the pipe pile 3, which can not only ensure that the pipe pile 3 can smoothly enter this circumference, but also is equivalent to reducing the diameter of the original drilling hole to make it closer to the diameter of the pipe pile 3 than before the improvement, thereby avoiding excessive inclination and deviation of the pipe pile 3 during installation and lowering, and making the verticality of the pipe pile 3 exceed the specification requirements. After each pile position is constructed, the steel plate 2 is directly removed and hung on the next pile position for continued use. The operation is simple, the recycling cost is low, the construction efficiency is high, and the safety is high.
[0024] During specific implementation, the hanging groove is rectangular, and its width matches the wall thickness of the casing 1. This can make the hanging groove fit perfectly with the casing 1, avoiding the inclination of the hanging groove during the installation of the pipe pile 3 and affecting the verticality of the pipe pile 3.
[0025] During specific implementation, the steel plates 2 inside and outside the casing 1 are both rectangular. Such a structure is more regular and simple, facilitating mass production.
[0026] During specific implementation, the length of the part of the steel plate 2 located inside the casing 1 is greater than the length of the part located outside the casing 1. The longer steel plate 2 inside the casing 1 can better position the pipe pile 3, while the shorter steel plate 2 outside the casing 1 can reduce the consumption of the steel plate 2 and save costs.
[0027] During specific implementation, the length L of the part of the steel plate located inside the casing, the diameter difference D between this circle and the pipe pile, and the verticality requirement P satisfy D / L < P. This can ensure that the verticality of the pipe pile within this section length meets the design and specification requirements.
[0028] During specific implementation, the width of the part of the steel plate 2 located inside the casing 1 is greater than the width of the part located outside the casing 1. The wider steel plate 2 inside the casing 1 can make the circle formed by the positioning edges not too large, so that it can be as close as possible to the diameter of the pipe pile. At the same time, it can enhance the stiffness of the end in contact with the pipe pile 3, reduce the deformation of the steel plate 2 caused by extrusion, and further improve the verticality of the pipe pile 3; while the narrower steel plate 2 outside the casing 1 can reduce the consumption of the steel plate 2 and save costs.
[0029] During specific implementation, the thickness of the steel plate 2 is 20 mm. The steel plate 2 has a certain thickness, making it not easy to shake after being hung on the casing 1.
[0030] During specific implementation, the diameter difference D between this circle and the pipe pile is less than 20 mm, and preferably the diameter difference D between this circle and the pipe pile is 5 - 20 mm.
[0031] The construction method for centering the pipe pile using the present utility model is as Figure 3As shown, specifically: drive the rotary drilling rig to the specified position, start the rotary drilling rig to drill a hole, then use a vibrating hammer to insert the casing into the hole mouth and continue drilling, discharge the debris while drilling, and immediately inject filler into the hole after the drilling is completed, then hang the steel plates on the upper end of the casing at intervals, sink the piles before the filling material begins to set, and recheck after the pile sinking is completed, and the centering of the pipe piles is completed.
[0032] When the centering structure of the utility model is used to center the pipe pile, the qualified rate of verticality of the pipe pile can reach 97%, and the qualified rate of pile position deviation can reach 99%. When no auxiliary measures are taken for centering, the qualified rate of verticality is less than 50%, and the qualified rate of pile position deviation is about 80%. It can be seen that the centering structure of the utility model can significantly improve the centering effect, thereby ensuring the vertical and axial force of the pipe pile, achieving uniform and effective wrapping of the pile surrounding filling material within the full length of the pipe pile, achieving better joint force and improving the vertical bearing capacity of the single pile, and avoiding quality problems such as the pipe pile bottom cannot reach the bottom of the hole when inserted into the hole, forming a hanging pile, and the pile position deviation exceeds the specification and design requirements.
[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit the technical solution. Ordinary technicians in this field should understand that those modifications or equivalent replacements of the technical solution of the utility model without departing from the purpose and scope of the technical solution of the utility model should be included in the scope of the claims of the utility model.
Claims
1. A centering structure for drilling piles, characterized in that: It includes a casing and at least three steel plates. The steel plates are provided with hanging grooves with one end open and the other end closed. The steel plates are hung on the upper end of the casing from top to bottom through the hanging groove openings at intervals from each other so that a part of the steel plates is located in the casing. The part of the steel plate located in the casing has a positioning edge parallel to the axis of the casing; all the positioning edges are located on the circumference of the same circle concentric with the casing; the diameter of the pipe pile is smaller than the diameter of the circle and is located within the circumference.
2. The centering structure for drilling piles according to claim 1, characterized in that: The hanging groove is rectangular, and its width matches the wall thickness of the casing.
3. The centering structure for drilling piles according to claim 1, characterized in that: The steel plates inside and outside the casing are both rectangular.
4. The centering structure for drilling piles according to claim 3, characterized in that: The length L of the steel plate inside the casing, the diameter difference D between the circle and the pile, and the verticality requirement P satisfy D / L <P。 5. The centering structure for drilling piles according to claim 3, characterized in that: The width of the portion of the steel plate located inside the casing is greater than the width of the portion located outside the casing.
6. The centering structure for drilling piles according to claim 1, characterized in that: The thickness of the steel plate is 20 mm.
7. The centering structure for drilling piles according to claim 1, characterized in that: The diameter difference D between the circle and the pipe pile is less than 20 mm.