JP4317654B2 - Rotation torque and indentation force measuring device for hollow pile construction of pile driver - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a rotational torque and indentation force measuring device at the time of hollow pile construction of a pile driving machine.
[0002]
[Prior art]
In the construction of a hollow pile that embeds the hollow pile by rotating the hollow pile connected to the lower part of the rotary drive device that goes up and down along the leader, in order to manage the bearing capacity of the pile, the direct load is applied to the pile after construction The load test to confirm the bearing capacity over time, and the ground near the construction site is investigated in advance by boring, etc., and during the construction up to the target depth, the rotational torque and indentation force that are the construction status of the pile are measured, and the theoretical formula is The method of calculating the bearing capacity of the pile is calculated. Although the loading test is reliable and highly reliable, the latter method is usually widely used because it takes time and cost for setup. The rotation torque is measured by measuring the current value when the rotary drive device is electric, and the pressure when the rotary drive device is a hydraulic motor. In addition, the pushing force is measured by directly measuring the end of the narrowing wire with a load cell. Further, as disclosed in Japanese Patent Application Laid-Open No. Hei 6-299531, there is a type in which a rotational torque is measured by attaching a sensor to a connecting member between an auger drive shaft and an auger of a rotary drive device.
[0003]
[Problems to be solved by the invention]
However, the measurement of rotational torque based on the current value and hydraulic oil pressure may cause a small amount of indentation force due to slipping at the tip of the pile if the rotation is continued on the support ground, resulting in a decrease in rotational torque. If too much is applied, the resistance at the tip of the pile will increase and the rotational torque will increase, making it difficult to determine whether the tip of the pile has reached the support ground. On the other hand, the pushing force cannot be measured when there is no tension of the squeezing wire, and a pushing force less than the weight of the construction apparatus cannot be applied. In this way, the bearing force is confirmed by the value of the rotational torque at a certain indentation force, but even with the same type and the same size pile, the measurement mechanism and value differ depending on the machine to be constructed, so it can be expressed by the same construction management formula. First, a coefficient to be corrected depending on the combination according to each pile or device was required, and it was necessary to determine the coefficient to be corrected by taking data from the test construction corresponding to each. Moreover, the above-mentioned sensor measures the rotational torque of the auger, not the rotational torque of the hollow pile, and the sensor structure is complicated and expensive.
[0004]
The present invention is, regardless of the construction unit, the rotational torque and pushing force received by pile itself accurately grasped, rotation during the hollow pile construction of pile driver can be accurately determined that the pile reaches the support ground An object of the present invention is to provide a torque and pushing force measuring device.
[0005]
[Means for Solving the Problems]
In order to achieve the above-described object, the present invention provides a pile driving machine for rotating a hollow pile connected to a lower portion of a rotary drive device that moves up and down along a leader, and burying the hollow pile. while projecting toward the outside of the plurality of load meter in the cylindrical portion of the pile driving member, the hollow pile coupling member connected to the hollow pile driving member, a long axial rotation of the load meter is inserted A long hole for torque measurement and a long hole for measuring a pushing force long in the circumferential direction are provided, a part of the plurality of load cells is formed in a long hole in the axial direction, and the rest of the plurality of load cells is disposed in the circumferential direction. Each of the plurality of load cells protrudes from the cylindrical portion of the hollow pile driving member at equal intervals in the circumferential direction, and has a long length in the axial direction. The holes and the long holes in the circumferential direction are equally spaced in the circumferential direction alternately in the hollow pile connecting portion. It is characterized in that it is provided with.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on an embodiment shown in the drawings. 1 to 3 show a first embodiment of the present invention. A pile driving machine 1 is mounted on a rotary drive device 4 provided so as to be able to move up and down along a leader 3 standing on the front part of a base machine 2. The hollow pile 5 is connected, and the hollow pile 5 is rotationally driven by the rotation driving device 4. Six pin-type load meters 7 are provided on the hollow pile drive shaft 6 of the rotational drive device 4 so as to protrude outward at equal intervals. A hollow pile 5 is connected to the hollow pile drive shaft 6 via a pile cap 8 which is a connecting member.
[0007]
The pile cap 8 has a cylindrical shape, and six elongated holes through which the pin-type load cell 7 is inserted are formed at the top thereof. In the long hole, long holes 9 that are long in the axial direction of the pile cap 8 and long holes 10 that are long in the circumferential direction of the pile cap 8 are alternately formed. In addition, a key groove 11 that engages with the protrusion 5 a of the hollow pile 5 is formed in the lower portion of the pile cap 8.
[0008]
With this configuration, when the hollow pile 5 is rotated by the rotation driving device 4 and a pushing force is applied, the pin type load meter 7 inserted into the long hole 9 long in the axial direction generates rotational torque and the long hole long in the circumferential direction. The pin type load cell 7 inserted through 10 measures the pushing force. Therefore, since the rotational torque and pushing force which the hollow pile 5 itself receives can be simultaneously measured and accurately grasped, it can be accurately determined that the hollow pile 5 has reached the support ground. Moreover, since the rotational torque and pushing force which hollow pile 5 itself receives can be grasped | ascertained correctly, the rotation torque and pushing force by the intensity | strength of hollow pile 5 can be restrict | limited, and damages, such as buckling of the pile 5 and screw breakage, can be prevented. .
[0009]
4 and 5 show the second embodiment of the present invention. In the construction of the hollow pile 5, the head of the hollow pile 5 may be buried below the ground level. A Yatco 20 is used as a connecting member between the shaft 6 and the hollow pile 5. The Yatco 20 is composed of an upper cylinder 20a connected to the pile cap 8 and a lower cylinder 20b connecting the hollow pile 5, and six pin-type load meters 7 project from the upper cylinder 20a, and a shaft is attached to the lower cylinder 20b. Long holes 9 that are long in the direction and long holes 10 that are long in the circumferential direction are alternately formed. As a result, the same effects as those of the first embodiment can be obtained.
[0010]
In each of the above embodiments, the case of screwing the hollow pile has been described. However, the present invention is not limited to this, and the present invention may be applied to a so-called Nakabori method in which the auger inserted into the hollow pile is rotationally driven.
[0011]
【The invention's effect】
As described above, the rotational torque and indentation force measuring device at the time of hollow pile construction of the pile driving machine of the present invention projects a plurality of load meters on the hollow pile drive member of the rotary drive device that rotates the hollow pile, The hollow pile connecting member connected to the hollow pile driving member is provided with a long long hole in the axial direction through which the load meter is inserted and a long long hole in the circumferential direction. Since the load meter inserted in the long hole in the axial direction measures the rotational torque and the load meter inserted in the long hole in the circumferential direction measures the pushing force, the hollow pile itself receives regardless of the construction equipment. Rotational torque and pushing force can be measured at the same time and accurately grasped, and it can be accurately judged that the hollow pile has reached the supporting ground. Moreover, since the rotational torque and pushing force which a hollow pile itself receives can be grasped | ascertained correctly, the rotation torque and pushing force by the intensity | strength of a hollow pile can be restrict | limited, and damages, such as buckling of a hollow pile and screw breakage, can be prevented.
[Brief description of the drawings]
FIG. 1 is a side view showing a first embodiment of the present invention. FIG. 2 is a sectional view taken along the line II-II in FIG. 1. FIG. 3 is a side view of a pile driving machine. FIG. 5 is a cross-sectional view taken along line VV in FIG. 4;
DESCRIPTION OF SYMBOLS 1 ... Pile driver, 3 ... Leader, 4 ... Rotation drive device, 5 ... Hollow pile, 6 ... Hollow pile drive shaft, 7 ... Pin type load meter, 8 ... Pile cap, 9, 10 ... Long hole, 20 ... Yatco

Claims (2)

In a pile driving machine for rotating a hollow pile connected to a lower part of a rotary drive device that moves up and down along a leader and burying the hollow pile , a plurality of load meters are disposed on a cylindrical portion of the hollow pile drive member of the rotary drive device the while projecting toward the outside, hollow pile coupling member, the long holes in the circumferential direction on the long push of a long rotational torque for measurement in the axial direction of the load meter is inserted which is connected to the hollow pile driving member A long hole for force measurement, a part of the plurality of load cells being inserted into the long hole in the axial direction, and the rest of the plurality of load cells being inserted into the long hole in the circumferential direction. Rotating torque and indentation force measuring device for hollow pile construction of a piling machine. The plurality of load cells protrude from the cylindrical portion of the hollow pile driving member at equal intervals in the circumferential direction, and the long hole in the axial direction and the long hole in the circumferential direction are the hollow pile connecting portion. The rotation torque and indentation force measuring device at the time of hollow pile construction of the pile driving machine according to claim 1, wherein the pile driving machine is provided at equal intervals in the circumferential direction alternately .

Images