Portable displacement observation device for foundation pile self-balancing method static load test

Abstract

The utility model relates to a portable displacement observation device for a foundation pile self-balancing method static load test, which is an improved and economical displacement observation device compared with a traditional displacement observation device and comprises an observation base which needs to freely slide in the vertical direction and is reliably and stably connected with a datum line beam. The lower portion of the base is connected with a signal line with scales, the upper portion of the base is connected with a guide pulley through a steel strand, and the other side of the pulley is hung through a weight with a certain mass, so that the signal line, connected with a load box, in the pile body is completely stressed and tightened. The four signal lines are mechanically connected with bayonets reserved in an upper cover plate and a lower cover plate of the load box in the pile body correspondingly, and the displacement of the upper cover plate and the displacement of the lower cover plate of the load box are measured correspondingly. The device further comprises a displacement sensor or a dial indicator for displacement measurement and observation and a static load tester for automatically collecting data. The self-balancing method static load test displacement observation device is easy and convenient to operate, accurate in positioning and capable of being repeatedly used, and manpower and material resources are saved.

Description

Technical Field

[0001] The utility model relates to a portable displacement observation device for static load test of a pile self-balancing method, which is an improved and economical displacement observation device compared with a traditional displacement observation device. Background Art

[0002] The bearing capacity of single pile foundations primarily relies on static load tests. Traditional static load tests use the heap load method, the anchor pile method, and the heap-anchor method. The heap load method and the anchor pile method have relatively high requirements for site and space. The anchor pile method requires pre-designed engineering piles as anchor piles during the design process, making it unsuitable for high-tonnage static load testing. On-site operations of the self-balancing static load test are not restricted by conditions such as bearing capacity, site, working space, pile length, and pile head treatment. Due to its distinct advantages, it has gradually become an important method for single pile bearing capacity testing and has been widely used in engineering construction fields such as civil engineering, water conservancy, transportation bridges, and ports.

[0003] A specially designed loading device, a load box, is pre-buried at the calculated equilibrium point of the pile body. The load box is welded to the pile body's steel cage, and its high-pressure oil pipe and displacement rod are brought to the ground. A high-pressure oil pump fills the load box with oil on the ground, and the load box transfers force to the pile body. The upper pile side's ultimate friction and deadweight are balanced with the lower pile side's ultimate friction and ultimate pile end resistance to maintain the load, thereby measuring the pile's bearing capacity. However, typical displacement rods are welded directly to the upper and lower covers of the load box. Displacement rods are disposable and consumable, which is relatively wasteful in terms of manpower and material resources. Moreover, for longer piles, excessively long displacement rods can cause excessive bending deformation, resulting in reduced detection accuracy.

[0004] In view of the above-mentioned defects of the existing displacement observation technology, this application proposes a portable displacement observation device for static load test using the self-balancing method of pile foundation. Utility Model Content

[0005] (1) Purpose of the utility model

[0006] Based on the technical problems existing in the background technology, the utility model proposes a portable displacement observation device for static load test of pile self-balancing method, which does not require pre-embedded displacement rods during construction and does not require excessive manual cooperation. It is simple and quick to install and has accurate detection with small error.

[0007] (2) Technical solution

[0008] To achieve the above-mentioned purpose, the utility model proposes a portable displacement observation device for static load test of pile self-balancing method, which includes an upper portable observation base, a lower signal line with scale and a probe fixing device and a corresponding control panel;

[0009] The portable observation base is a displacement observation plane that can slide freely along the vertical slide rail. The observation base and the pulley are fixed on the reference beam. The upper part of the base is connected to the weight by the pulley, and the lower part of the base is connected to the upper cover and lower cover of the load box by the scale signal line and the probe.

[0010] The signal line and the active channel of the probe are protected by a steel pipe (the foundation pile acoustic detection pipe can also be used). After the mechanical arm of the probe is opened, it is connected to the reserved bayonet at the bottom of the steel pipe.

[0011] The reserved bayonet is a locking device welded to the upper and lower covers of the load box during construction;

[0012] The opening and closing of the robotic arm is controlled by a ground control panel. The robotic arm is opened and fixed at the beginning of the test, and retracts after the test to facilitate the recovery of the signal line.

[0013] The above technical solution of the utility model has the following beneficial technical effects:

[0014] The start and end of the test are controlled by the probe's robotic arm, and the heavy weights keep the signal line in a vertically stressed state at all times, which can effectively ensure the accuracy and effectiveness of displacement observation. The device can be used repeatedly, and there is no need to pre-embed displacement rods during construction. It does not require excessive manual cooperation, and the installation is simple and quick, which improves the detection efficiency to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the upper observation base of the device of the present utility model.

[0016] Figure 2 This is a schematic diagram of the connection between the lower probe of the device of the utility model and the upper and lower covers of the load box.

[0017] Figure 3 This is a detailed diagram of the connection between the probe and the reserved bayonet of the device of the utility model.

[0018] Figure numerals: 1. Fixing device - reference beam; 2. Pulley; 3. Heavy weight; 4. Displacement sensor; 5. Observation base; 6. Observation base slide rail; 7. Signal line with scale; 8. Probe; 9. Robotic arm; 10. Control panel; 11. Signal line movable channel - embedded steel pipe; 12. Reserved bayonet; 13. Load box upper cover; 14. Load box lower cover.

[0019] Specific implementation methods

[0020] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are merely illustrative and are not intended to limit the scope of the present invention. Furthermore, descriptions of known structures and technologies are omitted in the following description to avoid unnecessary confusion regarding the concepts of the present invention.

[0021] A total of four sets of identical devices are required for one test. This case only describes one of them. In this embodiment, the reserved bayonet 12 is welded to the upper cover 13 and the lower cover 14 of the load box during construction. During the test, the reference beam 1 is reliably connected to the ground. The observation base slide rail 6 and the pulley 2 are fixed to the reference beam. The base 5 can slide freely up and down in the base slide rail 6. The upper part of the base 5 is connected to the heavy weight 3 through the pulley 2, and the lower part of the base 5 is connected to the scaled signal line 7. Before the test starts, the scaled signal line 7 and the probe 8 are slowly lowered to the reserved bayonet 12 through the movable channel-the embedded steel pipe 11. The control panel 10 is used to control the mechanical arm 9 to open and firmly connect to the reserved bayonet 12. Finally, the displacement sensor 4 is installed and the pressurization test is officially started.

[0022] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A portable displacement observation device for static load testing using the self-balancing method for pile foundations, characterized by: The reference beam (1) is reliably connected to the ground, the base slide rail (6) and the pulley (2) are fixed to the foundation beam, the base (5) can slide freely up and down in the base slide rail (6), the upper part of the base (5) is connected to the heavy weight (3), and the lower part of the base (5) is connected to the scaled signal line (7). Before the test begins, the scaled signal line (7) and the probe (8) are slowly lowered to the reserved bayonet (12) through the movable channel-steel pipe (11); the mechanical arm (9) is controlled to open and firmly connect to the reserved bayonet (12) through the control panel (10), and finally the displacement sensor (4) is installed and the test is officially started.

2. The portable displacement observation device for pile foundation self-balancing static load test according to claim 1 is characterized by: The reserved bayonet (12) is welded to the upper cover plate (13) and the lower cover plate (14) of the load box.

3. The portable displacement observation device for pile foundation self-balancing static load test according to claim 2 is characterized by: The base (5) can slide freely up and down in the base slide rail (6); the upper part of the base (5) is connected to the heavy object weight (3); and the lower part of the base (5) is connected to the signal line (7) with scale.

4. The portable displacement observation device for pile foundation self-balancing static load test according to claim 3 is characterized by: The mechanical arm (9) is controlled to open and firmly connect with the reserved bayonet (12) through the control panel (10).

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