JPS648131B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Use) The present invention is used in the field of improving soft ground.

In the present invention, a rotary casing having an outer circumferential surface screw is rotatably connected to the lower part of a machine frame suspended by a leader, and an inner rod is inserted into the rotary casing so as to be movable up and down. The casing and the inner rod are respectively driven by a rotation drive means and a vertical drive means provided in the machine frame, and after penetrating into the ground to a predetermined depth while rotating the rotary casing, the casing is pulled out while rotating. This invention relates to a device that forms sand piles in the ground by pushing out sand from a lower end of a casing while compacting it by vertical movement of an inner rod while charging sand from a sand charging hopper at the top of the device.

(Prior art) Generally, in sand pile construction equipment, when pulling out the casing, it is necessary to check the supply status of sand supplied into the casing. A weight type sand surface detection device is used to detect whether sand is being reliably pushed out and discharged. In this device, for example, a cord extending from the torque winch of the detection device body installed on the crane body is hung from above into the casing, and a weight attached to the tip is inserted into the upper surface of the sand (sand surface).
The string is kept under tension in order to maintain balance in this resting state, and as the sand surface inside the casing descends as the casing and inner rod are pulled up, the weight on the sand surface is lowered. The string that suspends the sand is fed out from the torque winch, and the flow and discharge status of the sand can be confirmed while measuring the amount of feed of the string on the detection device main body. . By the way, in conventional sand pile construction equipment that has a rotating casing and an inner rod that can only move up and down but cannot rotate, sand is directly thrown between the inner rod and the rotating casing. If the casing is pulled out while rotating, the sand inside the casing will rotate together with the casing, making it impossible to apply the sand surface detection device described above.In other words, the weight placed on the sand surface will move as the sand rotates. Therefore, when detecting the sand surface, the work of pulling out the casing had to be interrupted, resulting in a decrease in the efficiency of the sand pile construction work.

In addition, in the conventional device, the inner rod was only moved up and down for a predetermined stroke (for example, 1 to 2 m) by the up-and-down drive means, which made it impossible to compact the sand sufficiently. It was difficult to obtain consolidated sand piles.

In view of the above-mentioned problems, the present invention aims to prevent the sand from rotating as the casing rotates, and to effectively compact and extrude the sand at the lower end of the casing. purpose.

(Means for Solving the Problems) In order to achieve the above object, the sand pile construction device of the present invention includes a fixed pipe whose upper end is connected to a sand charging hopper in a rotating casing. The rotary casing is inserted near the lower end thereof, a screw winding in the opposite direction to the screw on the outer peripheral surface is screwed into the lower end of the inner peripheral surface of the rotating casing, and a vibration means is further provided at the lower end of the inner rod. It is characterized by

(Example) Next, an example of the present invention will be described based on the drawings.

Figure 1 shows a sand pile making device, and in this figure, 1 is a machine frame that is suspended from a leader (not shown) installed upright, such as a crawler crane, so that it can be raised and lowered, and the lower part of this machine frame 1 is A cylindrical rotating casing 3 has a screw 2 threaded over the entire length of its outer peripheral surface.
A hollow shaft-shaped inner rod 4 is inserted into the rotary casing 3 and is movable vertically within the casing 3 for a predetermined stroke. A small-diameter cylindrical fixed tube 5 is fitted with a slight gap between it and the inner peripheral surface of the casing 3, and a screw 2 on the outer peripheral surface of the rotary casing 3 is further fitted at the lower end of the inner peripheral surface of the rotating casing 3. A reverse winding screw 6 is installed. Reference numeral 7 denotes a sand charging hopper, which is disposed within the machine frame 1, and the upper end of the fixed pipe 5 is connected to the lower part of the hopper 7 so as to be able to communicate therewith. Reference numeral 8 denotes a rotation drive means for rotating the rotary casing 3, 9 a vertical drive means for moving the inner rod 4 up and down, and 10 a vibro float as a vibration means for vibrating the inner rod 4, which is installed at the lower end of the inner rod 4. be.

To explain the above structure in more detail, the upper end of the rotating casing 3 is rotatably supported in a suspended state by a bearing device 11 provided at the lower part of the machine frame 1. The rotation drive means 8 includes, for example, a gear 14 fixed to an output shaft 13 of an electric motor 12 installed in the machine frame 1.
The gear 1 is fixed to the upper end of the rotating casing 3.
5, and the rotation of the electric motor 12 causes the gear 1 to engage.
The rotary casing 3 is rotated via 4 and 15. The vertical drive means 9 includes, for example, a pair of left and right hydraulic or pneumatic cylinders 16, 16 installed on both sides of the inner rod 3 in the upper part of the machine frame 1, and the tips of piston rods 16a, 16a of these cylinders 16, 16. are connected to a movable plate 17 fixed to the upper end of the inner rod 3, and the inner rod 3 is moved up and down by the vertical expansion and contraction movements of these piston rods 16a, 16a during a constant stroke. As shown in FIG. 2, the VibroFlot 10 has a cylindrical float body 18 with
An electric motor 19 is provided and an eccentric shaft body 20 integrally connected to the output shaft of the electric motor 19 is mounted on the shaft.
The eccentric rotation of the float main body 18 causes vibration in the lateral direction (a direction intersecting the axial direction of the inner rod 4). The float body 18 is connected to the lower end of the inner rod 4 via a coupling 21. Further, a captire 22 for the electric motor 19 is inserted into the hollow portion 4a of the inner rod 4 from a required portion at the upper end of the inner rod 4, and is connected to the electric motor 19 within the float body 18.

As is clear from FIG. 1, the lower end of the fixed tube 5 inserted into the rotary casing 3 extends close to the upper end of a reverse winding screw 6 screwed into the lower end of the casing 3.

In operating the sand pile making device having the above-described configuration, first, the machine frame 1 is suspended and supported at an appropriate height from the top of the leader (not shown), and each cylinder 16, which is the vertical drive device 9, is suspended from the top of the leader (not shown). piston rod 1
6a is held in the extended position (raised position), thereby fixing the inner rod 4 in a fixed position, the rotation driving means 8 is operated to rotate the rotating casing 3, and the lifting operation wire (not shown) is operated. The rotary casing 3 drills holes in the ground while being fed out. After drilling the hole to a predetermined depth in this way, the feeding of the wire is stopped, and while the rotating casing 3 is being rotated, the fixed pipe 5 is inserted from the hopper 7.
At the same time, the vertical drive device 9 and the vibro-float 10 are operated, and the rotating casing 3 is ready to be pulled out while the lifting operation wire is wound up. The sand introduced into the lower end of the rotating casing 3 through the fixed pipe 5 is transferred to the inner rod 4.
While being compacted by the vertical movement of the casing 3, the lateral vibration of the vibrofrot 10, and the rotating extrusion action of the reverse winding screw 6 at the lower end of the inner peripheral surface of the casing 3,
As the rotating casing 3 is pulled out, the casing 3 is pushed out from the lower end, forming a sand pile in the ground. When the rotating casing 3 is pulled out, a weight-type sand level detection device is used to detect the sand level in order to check the state of sand supply to the lower part of the rotating casing 3. The sand is substantially fixed. Since it is inserted into the pipe 5 and is not in contact with the rotating casing 3, it does not rotate with the rotation of the rotating casing 3. Therefore, even when the rotating casing 3 is pulled up while still rotating, the sand surface cannot be detected. It can be performed. In FIG. 1, W indicates a weight for detecting the sand surface, which is suspended from the string H, and S indicates the sand surface.

In the above embodiments, the vibrating means is not limited to the Vibrofloat, and may be any other suitable vibrating device.
Further, the vibrating means may include, for example, a vibrator, which is operated in conjunction with the upper end of the inner rod to vibrate the entire inner rod. Furthermore, a so-called air spring device may be used as the inner rod vertical drive device.

(Effects of the Invention) According to the present invention, the fixed pipe whose upper end is connected to the sand charging hopper is inserted into the rotating casing up to near the lower end of the casing. The injected sand is essentially stored in the fixed tube, and even when the rotating casing rotates, the sand itself is not rotated. Therefore, when detecting the sand surface, the rotating casing is There is no need to stop the rotation of the casing to interrupt the extraction work, and the construction work can be performed continuously. Also, since it can prevent the rotation of sand,
This eliminates the inconvenience that occurs when the inner rod is destroyed due to twisting action as in the past. Furthermore, according to the present invention, a screw winding in the opposite direction to the screw on the outer peripheral surface of the casing is threaded onto the lower end of the inner peripheral surface of the rotating casing, so that when the rotating casing is rotated to perform extraction, the screw winding in the opposite direction is threaded onto the lower end of the inner peripheral surface of the rotating casing. As a result of this action, the sand at the lower end of the casing is effectively consolidated and reliably extruded. Particularly in the case of sand containing crushed stones, this reverse winding screw is more effective in preventing sand clogging at the lower end of the casing. Furthermore, according to the present invention, since the inner rod is provided with the vibration means, when the casing is pulled out, the vertical movement by the vertical drive means and the vibration by the vibration means act on the inner rod at the same time. In addition to the synergistic effect of vertical movement and vibration, the pressing effect of the reverse winding screw has the effect of creating a sufficiently consolidated and strong sand pile.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing an embodiment of the sand pile building apparatus according to the present invention, and FIG. 2 is an enlarged vertical cross-sectional view showing a vibrofloat. 2...screw, 3...rotating casing, 4
... Inner rod, 5 ... Fixed tube, 6 ... Reverse winding screw, 7 ... Sand charging hopper, 8 ... Rotation drive means, 9 ... Vertical drive means, 10 ... Vibro float (vibration means).

Claims (1)

[Claims] 1. A rotary casing having a screw on the outer peripheral surface is rotatably hung and connected to the lower part of the machine frame suspended by the leader, and an inner rod is vertically movably inserted into the rotary casing, and these rotary casings and In a sand pile making device in which the inner rod is driven by a rotational drive means and a vertical drive means provided in the machine frame, in the rotating casing,
A fixed pipe whose upper end is connected to the sand charging hopper,
Insert and deploy near the lower end of the rotating casing,
A sand pile making device characterized in that a screw winding in the opposite direction to the screw on the outer circumferential surface is threaded onto the lower end of the inner circumferential surface of the rotary casing, and a vibration means is further provided on the inner rod.