JPS6152286B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sand pile construction device used in a construction method for improving soft ground by constructing a large number of sand piles in the soft ground.

Conventionally, there is a technology in which a hollow tube with spiral propulsion blades on its outer periphery is penetrated into the ground while rotating, and then pulled out while rotating the hollow tube to create a sand pile. This was a management method that determined the total amount of sand used after construction was completed. For this reason, the operator had no choice but to rely on the intuition of the operator regarding the condition of sand discharge during sand pile construction, which caused problems in the construction of sand piles, such as the sand pile becoming narrow or broken in the middle.

The present invention solves the above problems and provides a sand pile construction device that can create good sand piles.

The details of the present invention will be explained below based on embodiments shown in the accompanying drawings.

In the figure, A is a hollow pipe for constructing sand piles,
It consists of a hollow tube 1 with propulsion blades 18, a hopper 2, and a short tube 3 in order from the bottom to the top. The hollow tube 1 and the hopper 2 are connected by a flange, and the hopper 2 and the short tube 3 are connected by a pipe 4 and ribs 5 and 6 arranged radially. In addition to the configuration described above, the hollow tube A for sand pile construction may have various configurations other than those shown in the drawings, such as one in which a window is provided on the circumferential surface of the hollow tube 1 and a hopper 2 is fixed to the outer circumference thereof.

B is a drive machine that rotates the hollow pipe A for sand pile construction, which transmits the driving force from the motor 7 to a reducer 8 and gears 9 and 10, and a cylindrical hollow transmission shaft 11 that is integrally connected to the gear 10. It is being transmitted to. The lower end of this hollow transmission shaft 11 is connected to the hollow pipe A for sand pile construction.
The pipe is connected to the upper end of the pipe by a flange, and the hollow pipe A for sand pile construction is rotated. Note that 12 is a house in which the motor 7, gears 9, 10, etc. are mounted.

C is a sand surface detection device that detects the sand surface inside the hollow tube 1. That is, a weight 13 for detecting the sand surface is suspended by a wire 14, and the wire 14 is wound up by a winding drum 15 via a sheave 16 and rewound. The winding drum 15 may be provided on the house 12 as shown in the drawing, or may be provided with a non-rotating portion such as a lower portion of the leader 17 along which the driving machine B is placed. In the latter case, it goes without saying that the wire 14 is guided to the winding drum 15 by an appropriate number of sheaves.

D is a guide pipe. This pipe D can not only properly insert the wire 14 into the hollow transmission shaft 11 but also properly guide the wire 14 within the hollow transmission shaft 11. In general, there are power cab tires and air hoses near the drive machine B, and there are various negative effects such as sand scattering from the lifting bucket that supplies sand to the hopper 2, etc., before the wire 14 is inserted into the hollow transmission shaft 11. The presence of such elements may cause the wire 14 to be damaged by twisting, abrasion, or sticking, and may also cause errors in the detection of the sand level within the hollow tube 1. The guide pipe D also serves to protect the wire 14 from the above problems.

When the guide pipe D is fixed to the hollow transmission shaft 11 as shown in FIG. 2, or the short pipe 3 is fixed,
Since the guide pipe D rotates together with the hollow pipe A, etc.,
The wire 14 also rotates and twists, making it difficult to properly measure the sand surface.

In this invention, in order to eliminate the above problem, the first
House 12 that does not rotate the guide pipe D as shown in the diagram
It is fixed to a part such as , so that the guide pipe D does not rotate even if the hollow tube A rotates. In addition, the guide pipe D may be of a single type as shown in the illustrated example, or may be a combination of several pipes connected by screws.

In addition, if the guide pipe D is extended to near the upper end of the hollow tube 1 below, the function of protecting the wire 14 from the sand flowing down from the hopper 2 can also be obtained.

Next, the operation of the above sand surface detection device will be explained.

Example 1 If the torque motor connected to the winding drum is controlled in two stages (high torque and low torque), when the torque is high, the torque generated by the weight is overcome and the winding is performed, and when the torque is low, the torque generated by the weight is generated. The weight is lowered due to the applied torque, and the weight is able to detect the ever-changing sand surface inside the hollow tube.

Example 2 A weight is used as an electrode weight, a wire is covered with an insulator, and the electrode weight - covered wire - control device - conductive inner wall of a hollow tube - sand containing moisture inside the hollow tube - electrode weight By forming an electric circuit, the contact/non-contact of the electrode weight with the sand surface performs a switching action, and when this switching action controls the drive of the motor connected to the winding drum, the electrode weight It is possible to detect the ever-changing sand surface inside the hollow tube.

However, if the rotation amount of the winding drum in Examples 1 and 2 above is drawn on a recording paper via a synchronized motor for transmission and reception, or displayed on an operation meter, the operator can
You can know the status of sand discharge inside the hollow tube every moment.

According to the sand pile construction device of the present invention, when constructing a sand pile using the rotating hollow tube as described above,
The sand level detection device allows you to know the status of sand discharge inside the pipe from time to time, and since a guide pipe is installed, the various negative factors mentioned above that exist near the drive machine can be eliminated, and the wire for sand level detection can be adjusted appropriately. However, especially in the case of this invention, the guide pipe is fixed to a non-rotating part such as a house housing the drive machine, so that the guide pipe does not rotate even if the hollow tube rotates. This eliminates the risk of wire twisting and ensures accurate detection. Therefore, good sand piles can be created. In addition, in the above-mentioned sand pile construction device of this invention, instead of sand which is a sand pile,
Of course, it can be used for construction using crushed stone, gravel, slag, or other suitable sand-like materials.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view showing an embodiment of the apparatus of the present invention, and FIG. 2 is a longitudinal sectional front view showing one in which the guide pipe rotates together with the hollow tube. 1...Hollow tube, 11...Hollow transmission shaft, 14...
Wire, 18...Propulsion blade, D...Guidance pipe.

Claims (1)

[Claims] 1. A sand pile construction device that creates sand piles in soft ground by rotating and pulling out hollow pipes for sand pile creation, the equipment being a sand pile construction device that creates sand piles in soft ground by rotating and pulling out a hollow pipe for sand pile creation, the hollow transmission shaft being connected to the top end of the hollow transmission shaft connected to the top end of the hollow pipe. A guide pipe is provided that passes through the inner space and reaches the upper end of the hollow space, and a wire for detecting the sand surface is inserted into the guide pipe with an appropriate play, and a necessary part of the guide pipe is connected to the hollow transmission A sand pile construction device that is installed in a non-rotating part such as a house that houses the driving machine that drives the shaft, so that the guide pipe does not rotate even if the hollow tube or hollow transmission shaft rotates.