Fixing device in pile foundation reinforcement cage hole

Abstract

The utility model relates to the technical field of pile foundation construction, and provides a pile foundation reinforcement cage in-hole fixing device which comprises an air compressor, an air conveying pipe, a valve set, a pressure gauge, an air bag and a guide cage fixing system. The problem that the reinforcement cage cannot be fixed under the special working conditions such as complex geology, limited space and full pile casing follow-up is solved through buoyancy generated by the air bag in mud in combination with rigid constraint of the guide cage fixing system. The guide cage fixing system is formed by welding lifting points, main reinforcements, restraining reinforcements and stirrups, the restraining reinforcements are arranged in an equilateral triangle shape to limit movement of the air bag, and it is guaranteed that the reinforcement cage is erected and the center position is accurate.

Description

Technical Field

[0001] This utility model belongs to the field of pile foundation construction technology, and specifically relates to a fixing device inside the reinforcement cage hole of a pile foundation. Background Technology

[0002] Currently, in pile foundation construction, the fixing of the reinforcing cage is a crucial step in ensuring project quality. Traditional methods typically involve welding reinforcing bars or using structural steel to fix the top of the cage to a steel casing to ensure verticality, prevent the bottom from contacting the borehole bottom, and ensure the protective layer thickness meets design requirements. However, in special circumstances such as complex geological conditions (e.g., karst caves, faults, quicksand), limited construction site space, or the use of a full casing follow-up process, traditional fixing methods become difficult to implement. This can lead to problems such as the reinforcing cage contacting the borehole bottom, twisting deformation, or misalignment, resulting in uneven protective layer thickness, insufficient protective layer in some areas, and cage misalignment, ultimately affecting the durability and safety of the pile foundation.

[0003] Therefore, there is an urgent need for a device that can stably fix the steel cage under special working conditions to overcome the shortcomings of existing technologies. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a fixing device for the inner hole of a pile foundation rebar cage. By combining the buoyancy of the airbag with the cage fixing system, it solves the problem of the rebar cage being unable to be fixed under special working conditions, ensuring that the verticality, protective layer thickness, and center position of the rebar cage meet the design requirements.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a fixing device for the inner hole of a pile foundation reinforcement cage, comprising: an air compressor, an air supply pipe, a valve group, an air bladder, and a cage fixing system; the air supply pipe connects the air compressor and the air bladder, and the valve group is arranged on the air supply pipe; the cage fixing system is a cage structure and is connected to the pile foundation reinforcement cage; the cage fixing system is equipped with a compartment, and the air bladder is disposed in the compartment; the buoyancy of the air bladder in its inflated state is greater than the self-weight of the cage fixing system and the pile foundation reinforcement cage.

[0006] Furthermore, the cage fixing system includes main reinforcement bars, restraint reinforcement bars, and stirrups; multiple main reinforcement bars are spaced apart circumferentially along the pile foundation reinforcement cage, the lower ends of the main reinforcement bars are connected to the pile foundation reinforcement cage, and the upper ends of the multiple main reinforcement bars are connected to the restraint reinforcement bars to form an integral structure; the stirrups clamp and connect the multiple main reinforcement bars; the main reinforcement bars, restraint reinforcement bars, and stirrups together form the compartment.

[0007] Furthermore, the cage fixing system also includes a lifting point, which is located at the upper end of the main reinforcing bar.

[0008] Furthermore, there are multiple stirrups, and the multiple stirrups are spaced apart along the height direction of the main reinforcement.

[0009] Furthermore, there are three constraint ribs, which are arranged in an equilateral triangle at the top of the airbag.

[0010] Furthermore, the air inlet of the airbag is located at the top and inside the constraint ribs arranged in an equilateral triangle.

[0011] Furthermore, the valve assembly includes multiple valves; the top of the airbag is provided with multiple air inlets; each air inlet is equipped with one of the valves and is connected to the air supply pipe.

[0012] Furthermore, the valve is a ball valve.

[0013] Furthermore, a pressure gauge is also installed on the gas pipeline.

[0014] Furthermore, the airbag is a cylindrical flexible inflatable component.

[0015] The beneficial effects of this invention are as follows: The buoyancy of the airbag supports the pile foundation reinforcement cage, avoiding the reliance on steel casings in traditional fixing methods. This makes it suitable for special working conditions such as complex geology, limited space, and full casing installation. The cage fixing system forms a rigid cage structure with compartments through restraint bars, main bars, and stirrups, effectively limiting airbag movement and uniformly transmitting buoyancy, ensuring the verticality and accurate centering of the pile foundation reinforcement cage, and solving the problems of twisting and misalignment. The valve group, in conjunction with the pressure gauge, achieves precise control of the airbag pressure and can monitor leakage in real time, ensuring the reliability of the fixing device. The connection method of each component of the fixing device is simple, the structure has high strength, and it is reusable, reducing construction costs. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the fixing device inside the pile foundation steel cage hole of this utility model;

[0017] Figure 2 This is a schematic diagram of the cage fixing system of this utility model.

[0018] In the diagram: 1-Air compressor; 2-First valve; 3-Pressure gauge; 4-Second valve; 5-Third valve; 6-Airbag; 7-Lifting point; 8-Main reinforcement; 9-Constraint reinforcement; 10-Stirrup; 11-Pile foundation reinforcement cage; 12-Cage fixing system; 13-Air supply pipe. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] like Figure 1 , Figure 2The pile foundation reinforcement cage fixing device shown includes an air compressor 1, a pressure gauge 3, an air bladder 6, a cage fixing system 12, an air supply pipe 13, and a valve group, wherein the valve group includes a first valve 2, a second valve 4, and a third valve 5.

[0021] Air compressor 1 is placed on the original ground at the pile foundation hole location; one end of air supply pipe 13 is connected to air compressor 1 using clamps; first valve 2, second valve 4, third valve 5 and pressure gauge 3 are respectively connected to air supply pipe 13 using clamps; the top of airbag 6 is provided with two air inlets, and the second valve 4 and third valve 5 are respectively provided at the two air inlets, and are connected to air supply pipe 13. One of the air inlets can also be configured as an air outlet for deflation of airbag 6. Airbag 6 is set inside the cage fixing system 12.

[0022] The cage fixing system 12 is composed of lifting point 7, main reinforcement 8, restraint reinforcement 9 and stirrup 10 welded together, and is welded to the pile foundation steel cage; the lifting point 7 is set at the top of the cage fixing system 12 and welded to the main reinforcement 8; the main reinforcement 8 is set in the longitudinal position of the cage fixing system 12; the restraint reinforcement 9 is set at the top of the airbag 6 and arranged in an equilateral triangle; the pile foundation steel cage 11 is set at the bottom of the cage fixing system 12.

[0023] Air compressor 1 inflates air bag 6. The power of air compressor 1 is selected according to the amount of air to be inflated and the time required.

[0024] The first valve 2, the second valve 4, and the third valve 5 control the flow or interruption of gas. Ball valves are recommended, and their specifications and models should match the gas delivery capacity of the gas pipeline 13 and the air compressor 1.

[0025] Pressure gauge 3 monitors the air pressure inside airbag 6 and detects whether there are any leaks in airbag 6.

[0026] The airbag 6 is placed inside the cage fixing system 12 to generate buoyancy under the action of mud within the virtual pile area. The cage fixing system 12 is used to fix and restrain the movement of the airbag 6. The restraining effect of the cage fixing system 12 transfers the buoyancy generated by the airbag 6 to the pile foundation reinforcement cage 11, keeping the pile foundation reinforcement cage 11 vertical and maintaining its designed position. The pile foundation reinforcement cage 11 is of the specified specifications and model in the design drawings.

[0027] Lifting point 7 is used for lifting the pile foundation reinforcement cage 11 and the cage fixing system 12. Its specification is HPB300φ36 n-shaped round steel, and its model can be adjusted by calculation according to the weight and size of the pile foundation reinforcement cage 11. Each main reinforcement bar 8 is provided with a lifting point at its top.

[0028] The two ends of the main reinforcement bar 8 are respectively connected to the round steel of the lifting point 7 and the main reinforcement bar of the pile foundation reinforcement cage 11 by welding. Its length is the length of the pile foundation virtual pile. It is used to make up for the height difference between the design top elevation of the pile foundation reinforcement cage 11 and the original ground, and also plays a role in lifting the pile foundation reinforcement cage 11. The specification of the main reinforcement bar 8 is HPB300φ20 round steel. Its model can be adjusted by calculation according to the weight of the pile foundation reinforcement cage 11.

[0029] The restraint bar 9 is used to fix the movement of the restraint airbag 6. The restraint effect of the restraint bar 9 transfers the buoyancy generated by the airbag 6 to the main bar 8 and the pile foundation steel cage 11. The specification of the restraint bar 9 is HRB400φ25 threaded steel, and its model can be adjusted by calculation according to the weight and size of the pile foundation steel cage 11.

[0030] The stirrups 10 are used to increase the overall rigidity of the cage fixing system 12 and enhance its integrity. The specifications of the stirrups 10 are HRB400φ25 threaded steel.

[0031] The gas delivery pipe 13 is used to deliver the gas output from the air compressor 1 and to maintain communication with the pressure gauge 3. Its specifications and models are matched with the gas delivery port, first valve 2, second valve 4, third valve 5 and pressure gauge 3 of the air compressor 1.

[0032] The construction method of the internal fixing device for the pile foundation reinforcement cage hole in this embodiment includes the following steps:

[0033] Step 1: Install and lower the 11-segment steel reinforcement cage into the pile foundation hole;

[0034] Step 2: Assemble and weld the cage fixing system 12. At the construction site, assemble and weld the cage fixing system 12 with the pile foundation steel cage 13. Use a crane to keep it and the pile foundation steel cage 13 in an upright position in the pile foundation hole.

[0035] Step 3: Place the uninflated airbag 6 into the cage fixing system 12;

[0036] Step 4: Assemble the air supply pipe 13, pressure gauge 3, first valve 2, second valve 4, third valve 5 and air compressor 1;

[0037] Step 5: Keep the first valve 2, the second valve 4 and the third valve 5 open, start the air compressor 1 to inflate the air bag 6, observe the value of the pressure gauge 3, stop inflating after the gas pressure in the air bag 6 reaches the required level, and close the first valve 2, the second valve 4 and the third valve 5.

[0038] Step 6: Remove the crane hook and use the buoyancy of the airbag 6 to keep the pile foundation steel cage 11 upright in its designed position.

[0039] The above are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are within its protection scope. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within its protection scope.

Claims

1. A pile reinforcement cage in-hole fixing device, characterised in that, The utility model relates to a kind of air cushion system, including: Air compressor, gas pipe, valve group, air bag and cage fixing system;The gas pipe is communicated with the air compressor and the air bag, and the valve group is arranged on the gas pipe;The cage fixing system is cage structure, and is connected with pile reinforcement cage;The cage fixing system is configured with cabin, and the air bag is arranged in the cabin;The buoyancy of the air bag in the inflated state is greater than the weight of the cage fixing system and the pile reinforcement cage.

2. A pile reinforcement cage in-hole fixing device according to claim 1, characterised in that, The cage fixing system includes main reinforcement, restraint reinforcement and stirrup;Multiple main reinforcements are arranged along the circumference of the pile reinforcement cage, and the lower end of the main reinforcement is connected with the pile reinforcement cage, and the upper end of multiple main reinforcements is connected with the restraint reinforcement as a whole structure;The stirrup is connected with multiple main reinforcements;The main reinforcement, restraint reinforcement and stirrup form the cabin.

3. A pile reinforcement cage in-hole fixing device according to claim 2, characterised in that, The cage fixing system further includes lifting point, and the lifting point is arranged at the upper end of the main reinforcement.

4. A pile reinforcement cage in-hole fixing device according to claim 2, characterised in that, The stirrup has multiple, and multiple stirrups are arranged along the height direction of the main reinforcement.

5. A pile reinforcement cage in-hole fixing device according to claim 2, characterised in that, The restraint reinforcement has three, and the three restraint reinforcements are arranged in the top of the air bag in equilateral triangle.

6. A pile reinforcement cage in-hole fixing device according to claim 5, characterised in that, The air inlet of the air bag is arranged at the top and located inside the restraint reinforcement arranged in equilateral triangle.

7. A pile reinforcement cage in-hole fixing device according to claim 6, characterised in that, The valve group includes multiple valves;The top of the air bag is provided with multiple air inlets;Each air inlet is provided with one valve, and is communicated with the gas pipe.

8. A pile reinforcement cage in-hole fixing device according to claim 7, characterised in that, The valve is a ball valve.

9. A pile reinforcement cage in-hole fixing device according to claim 1, characterised in that, The gas pipe is further provided with pressure gauge.

10. A pile reinforcement cage in-hole fixing device according to claim 1, characterised in that, The air bag is a cylindrical flexible inflatable component.

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