High-precision centering and hammer weight adjusting device for pile foundation high-strain hammering device

Abstract

The utility model discloses a high-precision centering and hammer weight adjusting device for a pile foundation high-strain hammering device, which comprises a magnet ring and a heavy hammer sleeved on the hammering device, and the magnet ring and the heavy hammer are coaxially arranged; the electromagnetic coil is arranged on a pile cap of a to-be-tested pile foundation in a sleeving mode, the electromagnetic coil and the pile cap are coaxially arranged, and the electromagnetic coil is connected with a power source to form a loop; the first regulator is used for regulating the current of the electromagnetic coil and is connected to the loop; and the second regulator is used for regulating the current direction of the electromagnetic coil and is connected to the loop. The utility model solves the problem that the centering operation of the hammer of the existing hammering device for the high strain test of the pile foundation is complicated.

Description

TECHNICAL FIELD

[0001] The utility model relates to bridge construction technical field, concretely relates to a high accuracy centering and hammer weight adjusting device for pile foundation high strain hammering device. BACKGROUND

[0002] The main source of bearing capacity in bridge structure engineering is from pile foundation, so it is necessary to ensure that the pile foundation has sufficient strength and bearing capacity. In the field construction, due to the complexity and diversity of construction, the bearing capacity of pile foundation often needs to be detected, and high strain is the main means of pile foundation bearing capacity detection.

[0003] In the high strain test of pile foundation, the centering of hammering device is crucial to the accuracy of test data. However, due to the complexity of construction conditions, the hammer is easy to deviate during falling, resulting in uneven stress on the pile top, and even damage to the pile body. In addition, due to the large weight of the hammer, the existing mechanical or manual centering method is contact centering, which is relatively complex to operate, and it is difficult to realize efficient and high-precision centering. At the same time, the working environment of construction is relatively complex, and in the state of wind, the force arm of lifting equipment appears slight jitter under the action of wind force, which will make the hammer produce large eccentricity. In the high strain test of pile foundation, the hammer weight required for different types, pile diameter and bearing capacity of pile is different, so the weight of the hammer needs to be adjusted during the general detection process. This process is also relatively complex. At the same time, when the hammering energy is large, the connection between the counterweight and the hammer is often loose under the impact, which not only makes the hammer eccentric, but also has certain danger.

[0004] The information disclosed in this BACKGROUND section is only for the purpose of increasing the understanding of the background of the present utility model and should not be regarded as an acknowledgment or any form of suggestion that it forms prior art that is publicly known. CONTENT OF THE UTILITY MODEL

[0005] In order to overcome the defects existing in the prior art, a high-precision centering and hammer weight adjusting device for pile foundation high strain hammering device is provided to solve the problem of complex hammer centering operation of the existing pile foundation high strain test hammering device.

[0006] In order to achieve the above purpose, a high-precision centering and hammer weight adjusting device for pile foundation high strain hammering device is provided, which comprises:

[0007] The magnet ring is sleeved on the weight of the hammering device, and the magnet ring is coaxially arranged with the weight;

[0008] The electromagnetic coil is sleeved on the pile cap of the pile foundation to be tested, and the electromagnetic coil is coaxially arranged with the pile cap, and the electromagnetic coil is connected with a power supply to form a loop;

[0009] a first regulator for adjusting the current size of the electromagnetic coil, connected to the circuit;

[0010] a second regulator for adjusting the current direction of the electromagnetic coil, connected to the circuit.

[0011] Further, the inner diameter of the magnet ring is adapted to the outer diameter size of the weight.

[0012] Further, the inner diameter of the electromagnetic coil is adapted to the outer diameter size of the pile cap.

[0013] Further, the first regulator is a variable resistor.

[0014] Further, the second regulator is a thyristor, a relay or a converter.

[0015] The high-precision centering and hammer weight adjusting device for the pile foundation high-strain hammering device of the utility model is used for adjusting the centering and hammer weight of the high-strain weight, and compared with the contact type or manual alignment and the hammer weight adjustment by counterweight of the ordinary hammering device for pile foundation high-strain test, the high-precision centering and hammer weight adjusting device for the pile foundation high-strain hammering device of the utility model adjusts the centering of the weight by the principle of magnetic attraction, increases the hammering energy of the weight by repulsion of the same nature, thereby increasing the hammer weight, reduces the hammering energy by attraction of different natures, thereby reducing the hammer weight, and the problem of complicated and complex operation of the centering of the weight and the adjustment of the hammer weight is solved creatively. BRIEF DESCRIPTION OF DRAWINGS

[0016] Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments thereof, read in conjunction with the accompanying drawings:

[0017] Fig. 1 The structural schematic view of the high-precision centering and hammer weight adjusting device for the pile foundation high-strain hammering device of the utility model embodiment.

[0018] Fig. 2 The structural schematic view of the magnet ring of the utility model embodiment.

[0019] Fig. 3 The structural schematic view of the electromagnetic coil of the utility model embodiment. DETAILED DESCRIPTION

[0020] The present application will be further described in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related utility model, and not to limit the utility model. In addition, it should be noted that, in order to facilitate the description, only the parts related to the utility model are shown in the drawings.

[0021] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other in the case of no conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0022] Referring to Figs. 1 to 3 The utility model provides a high accuracy centering and hammer weight adjusting device for pile foundation high strain hammering device, include: magnet ring 1, electromagnet 2, first regulator 3, second regulator 4.

[0023] Among them, magnet ring 1 is set in the weight 5 of hammering device. Magnet ring 1 is coaxially arranged with weight 5.

[0024] In the embodiment, the weight is cylindrical. The inner diameter of the magnet ring 1 is adapted to the outer diameter size of the weight 5. The upper end of the weight is coaxially connected with a lifting rod. The lifting rod is connected with hoisting machinery. The magnet ring is arranged at the lower end of the weight.

[0025] Preferably, the lower surface of the magnet ring is flush with the end face of the lower end of the weight. The magnet ring is a permanent magnet ring.

[0026] The electromagnet 2 is sleeved on the pile cap 6 of the pile foundation to be measured. The electromagnet 2 is coaxially arranged with the pile cap 6. The electromagnet 2 is connected with a power supply to form a loop.

[0027] In the embodiment, the inner diameter of the electromagnet 2 is adapted to the outer diameter size of the pile cap 6.

[0028] The first regulator 3 is connected to the loop. The first regulator 3 is used to adjust the current size of the electromagnet 2.

[0029] As a preferred embodiment, the first regulator 3 is a variable resistor.

[0030] The second regulator 4 is connected to the loop. The second regulator 4 is used to adjust the current direction of the electromagnet 2.

[0031] As a preferred embodiment, the second regulator 4 is a thyristor, a relay or a converter.

[0032] In the embodiment, the electromagnet, the power supply, the first regulator and the second regulator are connected by wires to form an electric loop. The current size of the electric loop is adjusted by the first regulator to adjust the magnetic force of the electromagnet; on the other hand, the current direction of the electric loop is changed by the second regulator to change the magnetic pole of the electromagnet. When the magnetic pole of the electromagnet is the same as that of the magnet ring, the weight repels the pile cap, and when the magnetic pole of the electromagnet is different from that of the magnet ring, the weight attracts the pile cap. By attracting or repelling the electromagnet and the magnet ring, the hammering force of the weight on the pile cap is increased or decreased.

[0033] The high-precision centering and hammer weight adjusting device for the pile foundation high-strain hammering device can preliminarily center when the weight hammer deviates from the pile top center of the pile foundation to be tested, and can avoid that the eccentricity of the weight hammer is too large and the required magnetic force is too large.

[0034] After the preliminary centering, the distance between the weight hammer bottom in the deviated direction and the electromagnetic coil is smaller than the distance between the weight hammer bottom in the deviated direction and the electromagnetic coil, and the magnetic force in the deviated direction is larger than the magnetic force in the deviated direction, so that a correction torque is generated, the force arm in the deviated direction is long, the force arm in the deviated direction is short, and thus the magnetic force resultant point is not the center of the weight hammer, so that the correction torque is generated, the direction of the torque is opposite to the deviated direction of the weight hammer, the magnetic force is uniformly distributed when the weight hammer is aligned with the pile top, and the correction torque is not generated.

[0035] Similarly, the magnetic field strength of the electromagnetic coil can be adjusted through the first adjuster to enhance or weaken the unbalanced magnetic force, so that the correction process is accelerated.

[0036] When the high-strain test of the pile foundation to be tested is performed, the force sensor and the displacement sensor are first installed on the pile foundation to be tested.

[0037] After the weight hammer is centered, the weight hammer is unhooked, and the electromagnetic coil is closed, so that the magnetic field is closed, and the influence of the magnetic field on the hammering energy is avoided.

[0038] The principle of adjusting the hammer weight of the high-precision centering and hammer weight adjusting device for the pile foundation high-strain hammering device is as follows:

[0039] When the hammer weight needs to be adjusted, that is, when the hammering energy needs to be changed, the magnetic field is adjusted to be homopolar or heteropolar, the acceleration of the weight hammer in the falling process is reduced through the homopolar repulsion force, so that the kinetic energy is reduced, and the acceleration of the weight hammer in the falling process is increased through the heteropolar attraction force, so that the kinetic energy is increased.

[0040] In the process of increasing the hammer weight, first, install the force sensor and displacement sensor. Then hang the heavy hammer to the top of the pile and perform the initial alignment. Perform the heavy hammer alignment by the method described above. Design the magnetic field according to the actual engineering needs, adjust the magnetic field to be heteropolar, increase the acceleration during the falling process of the heavy hammer, and thus increase the kinetic energy. Calculate the required force to adjust the magnetic force, and adjust the magnetic force through the first adjuster. Unhook the heavy hammer and perform the hammering. The magnetic field needs to be adjusted in real time during the falling process of the heavy hammer to ensure that the hammering energy meets the requirements.

[0041] In the process of reducing the hammer weight, first, install the force sensor and displacement sensor. Adjust the heavy hammer to the top of the pile and perform the initial alignment. Perform the heavy hammer alignment by the method described above. Design the magnetic field according to the actual engineering needs, repulsion between like poles, reduce the acceleration during the falling process of the heavy hammer, and thus reduce the kinetic energy. Calculate the required force to adjust the magnetic force, and adjust the magnetic force through the first adjuster.

[0042] The high-precision alignment and hammer weight adjusting device for the pile foundation high-strain hammering device is used for the alignment and hammer weight adjustment of the high-strain heavy hammer, and compared with the contact type or manual alignment of the common hammering device for the pile foundation high-strain test and the hammer weight adjustment by the counterweight, the high-precision alignment and hammer weight adjusting device for the pile foundation high-strain hammering device aligns the heavy hammer by the principle of magnetic attraction, increases the hammering energy of the heavy hammer by repulsion between like poles, thus increases the hammer weight, reduces the hammering energy by attraction between unlike poles, thus reduces the hammer weight, and thus creatively solves the problems of the heavy hammer alignment and hammer weight adjustment.

[0043] The above description is only the preferred embodiment of the application and the explanation of the applied technical principles. Those skilled in the art should understand that the utility model range involved in the application is not limited to the technical solutions formed by the specific combination of the technical features described above, and should also cover other technical solutions formed by the arbitrary combination of the technical features described above or their equivalent features without departing from the utility model concept. For example, the technical solutions formed by the mutual replacement of the above features and the technical features disclosed in the application (but not limited to) having similar functions.

Claims

1. A high precision centering and hammer weight adjustment device for a pile foundation high strain dynamic compaction apparatus, characterized in that, The utility model relates to a hammering device for testing pile foundation, comprising: a magnet ring sleeved on a weight of the hammering device, the magnet ring being coaxially arranged with the weight; an electromagnetic coil sleeved on a pile cap of the pile foundation to be tested, the electromagnetic coil being coaxially arranged with the pile cap, the electromagnetic coil being connected with a power supply to form a loop; a first regulator for adjusting the current size of the electromagnetic coil, the first regulator being connected to the loop; a second regulator for adjusting the current direction of the electromagnetic coil, the second regulator being connected to the loop.

2. A high precision centering and ram weight adjusting device for a pile foundation high strain dynamic load testing apparatus as claimed in claim 1, wherein, The inner diameter of the magnet ring is adapted to the outer diameter size of the weight.

3. A high precision centering and ram weight adjusting device for a pile foundation high strain dynamic load testing apparatus as claimed in claim 1, wherein, The inner diameter of the electromagnetic coil is adapted to the outer diameter size of the pile cap.

4. A high precision centering and ram weight adjusting device for a pile foundation high strain dynamic load testing apparatus as claimed in claim 1, wherein, The first regulator is a variable resistor.

5. A high precision centering and ram weight adjusting device for pile foundation high strain dynamic load testing apparatus as claimed in claim 1 wherein, The second regulator is a thyristor, a relay or a converter.

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