JPH021928B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a press-fitting device for a steel pipe body, such as a steel pipe sheet pile or a steel pipe pile, for press-fitting a steel pipe body into the soil.

In recent years, due to pollution problems such as vibration and noise in construction and civil engineering work, attempts have been made to install steel pipe bodies without vibration or noise, instead of using diesel hammers. The steel pipes are installed by press-fitting them instead of driving them. By the way, when a steel pipe body is press-fitted into the soil using such a press-in machine, an auger or the like is used in conjunction with the press-in machine, but since the press-in force of the press-in machine is limited, Unless the vertical accuracy is precisely controlled, there is a risk that once the steel pipe body tilts, it will not be possible to correct it. When steel pipe sheet piles are continuously driven in a ring shape to form a well, such an inclination makes it difficult to construct the final closing pile and the ring cannot be closed. When pouring concrete vertically, vertical accuracy must be particularly high.

In the past, vertical accuracy was controlled by visually observing the steel pipe body built on a predetermined ground using a transit from two mutually orthogonal directions (x direction and y direction), and driving the steel pipe body while checking the vertical direction of the steel pipe body. was. For this reason, as the driving progresses and the length of the pile remaining on the ground becomes shorter, it becomes difficult to visually detect the inclination of the steel pipe body, and the detection accuracy decreases.
In addition, in the case of joint piles, since the lower pile is buried underground with the head remaining, it is difficult to perform the weld joint while keeping the upper and lower piles completely vertical due to the poor end surface accuracy of the steel pipe body. It was completely impossible. Above all, even if the inclination of the steel pipe body was detected visually via the transit, the operation to correct the inclination would have to be performed manually based on this data, which was very time-consuming.

The present invention has been made in view of these points, and its purpose is to provide a press-in device for steel pipe bodies that can maintain high vertical accuracy when press-fitting steel pipe bodies and is easy to install. It is on offer.

To explain the present invention below, the present invention includes a holding part that tightens and holds the outer peripheral surface of a steel pipe body such as a steel pipe pile or a steel pipe sheet pile, and a plurality of push-in jacks that lower this holding part. A press-in machine in which each connected pushing jack is arranged so that it can tilt freely, an inclinometer that detects the direction and amount of inclination of the steel pipe body that is press-fitted into the soil by the press-in machine, and the detection output of the inclinometer. This system consists of a control circuit that controls the operation of each push-in jack in the press-in machine, respectively, and the press-in machine automatically corrects the inclination of the steel pipe body according to the detection output of the inclinometer. To explain in detail based on the illustrated embodiment, 1 in the figure is a steel pipe body which is a steel pipe sheet pile, and has joint parts 11, 11 on both sides. This steel pipe body 1 is press-fitted by a press-fitting machine 2 into a hole excavated by an auger 12 having a drilling blade 13 attached to its lower end and inserted into the steel pipe body 1 . As shown in FIGS. 2 and 3, the press-fitting machine 2 includes a pedestal 21 provided with a large-diameter hole in the center through which the steel pipe body 1 is inserted, and push-in jacks placed at each of the four corners of this pedestal 21. 3 and a tightening frame 4 that is moved up and down by these four push-in jacks 3. Each push-in jack 3 supports a spherical portion at the lower end on a seat 22 on a pedestal 21, for example. It is a hydraulically driven type that can be tilted freely within a certain range in all directions by tilting, etc., and can be moved horizontally within a minute range. The tightening frame 4, which is a holding part that tightens and holds the outer peripheral surface of the steel pipe body 1, is 4
It is formed by connecting two arc-shaped members 23 in an annular manner with two pivots 24 and two tightening cylinders 25, and the upper part of the push-in jack 3 is fixed to each arc-shaped member 23, respectively. ing. FIG. 4 is a hydraulic circuit diagram of this press-fitting machine 2, in which the discharge side of the hydraulic pump 26 and the tank 27 are connected to each pushing jack 3 via an electromagnetic-hydraulic control type switching valve 7 with 4 ports and 3 positions. It is connected to both ends of the tightening cylinder 25 via a switching valve 28.

The inclinometer 5 outputs as an electrical output the amount of inclination (inclination angle) in one direction or in _two x and y directions perpendicular to each other due to a change in its attitude, and is connected to the push jack 3 of the press-fitting machine 2 in both the x and y directions. installed in such a way that it can detect the inclination of the A control circuit 6 is provided on the operation panel (not shown) for controlling the switching valve 7 corresponding to each push-in jack 3 of the press-fitting machine based on the detection output of the inclinometer 5 to correct the inclination. 5, connected to the switching valve 7 and the switching valve 28.

Therefore, by installing the press-fitting machine 2 on a horizontal surface and contracting the tightening cylinder 25, the tightening frame 4 is attached to the steel pipe body 1.
If each switching valve 7 is switched in one direction while the outer circumferential surface of
is lowered vertically downward and the steel pipe body 1 is press-fitted into the soil. If the steel pipe body 1 is tilted, for example, in the x direction, the push jack 3 is also tilted at this time, so this tilt is detected by the inclinometer 5, and the control circuit receives the tilt direction and the amount of tilt. 6 stops the operation of one of the two push-in jacks 3 on the x-axis via the switching valve 7, and continues the operation of the other three push-in jacks 3 until the steel pipe body 1 returns to vertical. Then, make the vertical correction, and once the correction is completed, press the jack all the way again 3.
Activate. When one stroke of the push-in jack 3 is completed, the control circuit 6 immediately extends the tightening cylinder 25 and loosens the tightening frame 4 in response to an input from a limit switch or the like that detects this, and in this state, each switch is switched. The valve 7 is switched to the other side, the full push-in jack 3 is extended, and the tightening frame 4 is moved upward.
When the extension of each pusher jack 3 is completed, the control circuit 6 causes the tightening frame 4 to tighten and the pusher jack 3 to lower the tightening frame 4 in response to an input from a limit switch or the like. Resume press-fitting. At this time, if the steel pipe body 1 is tilted in both the x and y directions, the control circuit 6 controls the operation of each pushing jack 3 in both the Stop until the tilt in each direction is corrected. In this way, the steel pipe body 1 is press-fitted while automatically correcting the inclination.

The inclinometer 5 does not necessarily need to be attached to the push jack 3 of the press-fitting machine, and may be attached directly to the steel pipe body 1, but in this case, although the accuracy of detecting the inclination of the steel pipe body 1 is increased, the wiring process is troublesome. Also, it is necessary to install the inclinometer 5 in accordance with both the x and y directions set in the control circuit 6 and the press-in machine 2, and if you make a mistake, you will not be able to correct the inclination. It is preferable to attach it to 3. Furthermore, in order to improve the inclination detection accuracy when the inclinometer 5 is attached to the push-in jack 3, as shown in FIG. Attach inclinometer 5 to
In the control circuit 6, it is preferable that the inclination in each of the x and y directions is determined by taking the average value of the inclination amount outputs from the inclinometers 5x, 5x, 5y, and 5y in each direction. That is, if the inclination amount outputs in each x direction from the two inclinometers 5x and 5x in the x direction are a and b, then (a+
b)/2 is used as control data for the switching valve 7. The actual amount of inclination of the steel tube 1 and the amount of inclination of the push-in jack 3 detected by the inclinometer 5 may differ, as shown in FIGS. 6a and b, depending on the contact between the clamping frame 4 and the steel tube 1. However, this can be corrected and the tilt detection accuracy can be improved.

In addition, in the illustrated example, the number of push-in jacks 3 is 4.
In this book, two hydraulic jacks 3 are arranged on each axis in both the x and y directions, but the arrangement of the x and y directions is arbitrary. Of course, even if the number of push-in jacks 3 is three at 120° intervals, the inclination direction that can be detected by the inclinometer 5 attached to each push-in jack 3 can be determined by x, e, f at 120° intervals. The control circuit may control the three pusher jacks 3 based on these data. in this case,
The amount of inclination in the x, e, and f directions may be converted into the amount of inclination in the xy direction and the push jacks 3 may be controlled based on this. Therefore, the number of push jacks 3 and the number of inclinometers 5 It is okay for the two to be different.

As described above, in the present invention, a steel pipe is operated by an inclinometer that detects the inclination of a steel pipe body, and a control circuit that controls the operation of each pushing jack of a press-fitting machine according to the detection output of the inclinometer. The inclination of the steel pipe body is automatically corrected, and the steel pipe body can be easily press-fitted into the soil with high vertical accuracy.

[Brief explanation of drawings]

Fig. 1 is a front view of one embodiment of the present invention, Figs. 2 and 3 are a front view and a plan view of the same press-fitting machine, and Fig. 4 is a front view of an embodiment of the present invention.
5 is a schematic plan view of another embodiment, FIGS. 6 a and b are action explanatory diagrams of the same, and FIG. 7 is a schematic plan view of still another embodiment, 1 is a steel pipe body, 2 is a press-fitting machine, 3 is a push jack, 4 is a tightening frame as a holding part, 5 is an inclinometer, and 6 is a control circuit.

Claims (1)

[Scope of Claims] 1. A holding part that tightens and holds the outer peripheral surface of a steel pipe body such as a steel pipe pile or a steel pipe sheet pile, and a plurality of push-in jacks that lower this holding part, each of which is connected to the holding part. A press-in machine in which each push-in jack is tiltably arranged; an inclinometer that detects the direction and amount of inclination of the steel pipe body that is pressed into the soil by the press-in machine; A press-fitting device for a steel pipe body, comprising a control circuit that controls the operation of each push-in jack in a press-fitting machine. 2. A press-fitting device for a steel pipe body according to claim 1, wherein the inclinometer is attached to a pushing jack of a press-fitting machine. 3. The inclinometer is attached to each pushing jack of the press-fitting machine, and the control circuit calculates the direction and amount of inclination using the average value of the detection outputs from the plurality of inclinometers. A press-fitting device for a steel pipe body according to scope 2.