Rotary excavating pile steel bar positioning device and construction method

Abstract

The invention relates to the technical field of house building engineering construction, in particular to a rotary excavating pile steel bar positioning method which comprises a device body, the device body comprises a plurality of jacking units, and the jacking units are evenly arranged on the outer side of a steel bar cage in the circumferential direction and used for determining the distance between the steel bar cage and the inner wall of a rotary excavating pile. The steel reinforcement cage supporting device is simple in structure and convenient to mount, each supporting unit is a single component, mounting and dismounting are easy, and the steel reinforcement cage can be directly hung and connected in the welding process; and the jacking units effectively support the reinforcement cage, so that the work of manually dragging and positioning the reinforcement cage at the edge of a pile hole by using a rope is avoided, and potential safety hazards are completely eradicated.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction engineering, and in particular to a rotary pile reinforcement positioning device and a construction method. Background Art

[0002] In the process of rotary pile construction, the plane positioning of the steel cage is extremely important. Its plane position directly determines the vertical stress of the structure and is related to the overall safety of the structure. However, in the current pile foundation construction process, the pile foundation steel cage is usually fixed and positioned only by the hole mouth hanging rod control. This control method cannot ensure the accuracy of the pile foundation plane position at all. In the process of pile foundation drilling, due to the swing of the drill rod of the drilling rig, the actual diameter of the drill hole is often 0.15m to 0.3m larger than the designed diameter. Secondly, when the steel cage is installed, the steel cage often collides and rubs against the hole wall due to positioning deviation, causing the hole wall to collapse, the hole to collapse, the hole to expand, and the need to clean the hole again in the later stage, which seriously affects the overall safety of the structure, the stress of the pile body, the construction progress, the economy, etc. Therefore, in order to completely solve the above problems, a device and construction method that can be easily installed and effectively position the steel cage in the pile hole are needed. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a rotary pile reinforcement positioning device and a construction method to achieve the technical effects of convenient installation and accurate positioning of the reinforcement cage.

[0004] To achieve this technical purpose, the present invention adopts the following scheme: A rotary pile reinforcement positioning device comprises a device body, wherein the device body comprises a plurality of top support units, which are evenly arranged on the outside of a reinforcement cage in the circumferential direction and are used to determine the distance between the reinforcement cage and the inner wall of the rotary pile.

[0005] Compared with the prior art, the present invention has the following beneficial effects: The present invention has a simple structure and is easy to install. Each supporting unit is a single component, which is easy to install and disassemble. It can be directly hung during the welding process of the steel cage. The top support unit effectively supports the steel cage, avoiding the work of manually dragging and positioning it at the edge of the pile hole with ropes, thus eliminating safety hazards.

[0006] Further, the preferred embodiment of the present invention is: The top support unit comprises a top support frame, one end of which is connected to the steel cage, and the other end of which is provided with a top plate.

[0007] One end of the top support frame connected to the steel cage is provided with a vertical sleeve, and the top support frame is sleeved on the steel cage through the vertical sleeve.

[0008] The outer surface of the top plate is an arc surface whose curvature is consistent with the curvature of the inner wall of the rotary drilling pile.

[0009] The present invention also relates to a method for positioning steel bars of a rotary pile, which is carried out according to the following steps: S1. Determine the center of the rotary pile on site, and use the center of the rotary pile as the center of the circle. After confirming the radius of the pile hole, draw the pile hole; S2, rotary pile drilling; S3. After the drilling is completed, the drilled hole is fully inspected and the hole wall is cleaned; S4. Install the positioning device. During installation, the vertical sleeve is placed on the vertical main reinforcement of the steel cage, and one end of the top plate is placed outside the steel cage; S5. Vertically hoist the steel cage into the pile hole, and when lowering it, make the curved surface of the top plate contact with the inner wall of the pile hole and move downward; S6. Installation completed.

[0010] The method maintains the distance between the steel cage and the inner wall of the pile hole through the top support unit, ensures that the steel cage is located in the center of the pile hole, and improves the installation accuracy of the steel cage. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 The structure diagram of the top support unit Figure 1 ; Figure 2 The structure diagram of the top support unit Figure 2 ; Figure 3 It is a structural schematic diagram when the top unit is used for positioning the reinforcement cage; Marked in the figure: 1. Top support frame; 2. Vertical casing; 3. Top plate; 4. Steel cage. DETAILED DESCRIPTION

[0012] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the following is a brief description of the present invention in conjunction with the attached Figures 1 to 3 , the specific implementation methods of the present application are described in detail. Many specific details are set forth in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0013] A rotary pile reinforcement positioning device comprises a device body, wherein the device body is composed of a plurality of top support units, and the top support units are arranged at intervals on the periphery of a reinforcement cage 4 to position the distance between the reinforcement cage 4 and the inner wall of the rotary pile.

[0014] The top support unit includes a top support frame 1, one end of which is welded with a vertical sleeve 2, which is sleeved on the vertical main reinforcement of the steel cage 4, and the other end of the top support frame 1 is welded with a top plate 3, the outer surface of the top plate 3 contacts the inner wall of the pile hole.

[0015] In this embodiment, the outer surface of the top plate 3 is a curved surface, and the curvature of the outer surface is consistent with the curvature of the inner wall of the rotary pile.

[0016] Based on the above device, the steel cage is installed and positioned according to the following steps: S1. According to the building construction measurement control network and the foundation plan, determine the center of the rotary drilling pile at the construction site, and determine the position of the rotary drilling pile with the center of the rotary drilling pile as the center of the circle. Then, after determining the radius according to the design requirements, draw the pile hole.

[0017] S2. Drilling of rotary piles. When drilling, pre-install the intercommunication according to the inner diameter of the rotary pile. It is required that the center of the rotary pile coincides with the center line of the casing. Then, according to the drilling process requirements, the drilling rig is used to open the hole.

[0018] S3. After the drilling is completed, the hole is fully inspected. If the inspection results meet the requirements, the hole wall is cleaned.

[0019] S4. Install the positioning device. Before installation, determine the number of top support units according to the outer circumference of the steel cage. Then, during the production of the steel cage 4, the vertical sleeve 2 of the top support unit is installed on the vertical main reinforcement of the steel cage 4 according to the designed position, and the end with the top plate is placed outside the steel cage 4.

[0020] S5. After the steel cage is manufactured, the steel cage 4 is hoisted by hoisting equipment, and the steel cage 4 is vertically hoisted into the pile hole. When lowering, the surface of the top plate contacts the inner wall of the pile hole, and the top unit is used to maintain the distance between the steel cage 4 and the inner wall of the pile hole.

[0021] S7. After the bottom of the steel cage is in place, the positioning and installation are completed, and then the subsequent construction of rotary drilling piles is carried out.

[0022] In this embodiment, the drilling inspection also requires comprehensive measurement of the hole bottom elevation, pile center line, well wall verticality, and loose soil thickness, and detailed recording of the inspection data.

[0023] Compared with the conventional method of positioning the steel cage by dragging the rope manually, the present invention has the following characteristics: Easy to install: The overall structure is simple and it is a single component, which is easy to install and disassemble. It can be hung during the welding process of the steel cage.

[0024] Safe to use: The use of this fixture can effectively support the steel cage in the pile hole, avoiding the traditional manual positioning process of dragging ropes at the edge of the pile hole, effectively eliminating safety hazards.

[0025] Effectively improve the positioning accuracy of rotary piles: maintain the distance between the steel cage and the inner wall of the pile hole through top support and contact arc, ensure that the steel cage is located in the center of the pile hole, ensure the verticality of the steel cage, and effectively improve the construction quality of the pile body.

[0026] Finally, it should be noted that the above are only preferred embodiments of the present invention. Of course, those skilled in the art can make changes and modifications to the present invention. If these modifications and variations fall within the scope of the claims of the present invention and their equivalent technologies, they should be considered to be within the scope of protection of the present invention.

Claims

1. A rotary pile reinforcement positioning device, characterized in that: The device comprises a device body, which comprises a plurality of top support units, which are evenly arranged on the outside of the steel cage in the circumferential direction and are used to determine the distance between the steel cage and the inner wall of the rotary pile.

2. The rotary pile reinforcement positioning device according to claim 1 is characterized in that: The top support unit comprises a top support frame, one end of which is connected to the steel cage, and the other end of which is provided with a top plate.

3. The rotary pile reinforcement positioning device according to claim 2 is characterized in that: One end of the top support frame connected to the steel cage is provided with a vertical sleeve, and the top support frame is sleeved on the steel cage through the vertical sleeve.

4. The rotary pile reinforcement positioning device according to claim 2, characterized in that: The outer surface of the top plate is an arc surface whose curvature is consistent with the curvature of the inner wall of the rotary drilling pile.

5. A method for positioning steel bars of a rotary pile according to any one of claims 1 to 5, characterized in that: Follow these steps: S1. Determine the center of the rotary pile on site, and use the center of the rotary pile as the center of the circle. After confirming the radius of the pile hole, draw the pile hole; S2, rotary pile drilling; S3. After the drilling is completed, the drilled hole is fully inspected and the hole wall is cleaned; S4. Install the positioning device. During installation, the vertical sleeve is placed on the vertical main reinforcement of the steel cage, and one end of the top plate is placed outside the steel cage; S5. Vertically hoist the steel cage into the pile hole, and when lowering it, make the curved surface of the top plate contact with the inner wall of the pile hole and move downward; S6. Installation completed.

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