JP2510200B2 - Sand pile construction method and its equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a sand pile construction method and an apparatus therefor as a step of improving soft ground, and particularly to the entire length of sand pile or a part thereof by a water-permeable cylinder. The present invention relates to a method for constructing a covered sand pile and its apparatus.

[Conventional technology]

As a method of constructing sand piles for the improvement of soft ground,
A method for constructing a sand pile and a device for covering the entire length or a part of the sand pile with a water-permeable cylinder have been conventionally known (see, for example, JP-B-60-11157 and JP-B-61-4444). ). The water-permeable cylinder in such a sand pile construction method and apparatus is suspended by a suspending wire through a required suspending metal fitting.

On the other hand, the measurement of the sand surface in the above construction method is performed by attaching a weight cone to the lower end of the measuring wire and detecting the amount of movement of the measuring wire with a sand surface gauge (for example, the actual open sho 58-
(See JP No. 59838).

[Problems to be solved by the invention]

In the conventional case, there are suspension wires for the water permeable cylinder as described above and measurement wires for the sand gage, and these are entangled with each other during construction, or they must be operated individually, so operation Was complicated and there was a problem. Further, in terms of the structure of the apparatus, there is also a problem that two kinds of wires, a winding drum, a driving motor and the like are required.

Therefore, the present invention solves such a problem by making the above wires common.

[Means for solving problems]

As a sand pile construction method for solving the above problems, the first invention of this application is to hang a flexible water-permeable cylinder inside a hollow pipe for sand pile construction, and to penetrate the hollow pipe into the ground. In addition to charging sand into the inside, after filling the sand into at least the water-permeable cylinder, by pulling out the hollow tube, in the construction method to create a sand pile whose outer periphery is covered by the water-permeable cylinder, The flexible cylinder is connected to one end of the suspending wire via a suspending metal fitting, and the other end of the suspending wire is associated with the detecting part of the sand level gauge, and the change in the position of the suspending metal fitting is detected by the detecting part of the sand level gauge. Is detected by the.

Also, as a sand pile building device that solves the above problems,
A second invention of the present application is a sand pile building apparatus in which a flexible water-permeable cylinder is suspended in a hollow tube for sand pile building by a hanging wire so that the hanging wire is a sand level gauge. It is configured to be related to the detection unit of.

In the first and second inventions, the term "sand" is a broad concept that includes sand-like granular materials such as gravel, crushed stone, and crushed stone, in addition to the original sand.

〔Example〕

For convenience of description, first, a sand pile building device according to an embodiment of the second invention will be described with reference to FIGS. 1 and 2.

The hollow tube 1 is equipped with a penetrating machine 2 at its upper end, and the penetrating machine 2
The hopper 3 for sand supply is provided below. Inside the hollow tube 1, a flexible water-permeable cylindrical body 4 inserted from the lower end thereof is suspended via a suspension metal fitting 5.

As shown in FIG. 2, the hanging fitting 5 is provided with an inward receiving edge 7 at the lower end of the ring body 6, and an inner ring 8 is loosely fitted in the receiving edge 7. The cylindrical body 4 is held by the receiving edge 7 by winding the upper edge of the cylindrical body 4 around the inner ring 8. Also,
A hanging wire 10 is detachably attached to a bar 9 passed to the ring body 6, and the hanging wire 10 is drawn out of the hollow tube 1.

A winding device 11 is mounted on the outer peripheral portion of the hollow tube 1, and the hanging wire 10 is wound around the winding drum 12 (see FIG. 3). The winding drum 12 is driven by a drive motor 13 such as a torque motor that can easily change the magnitude of the winding torque.

The winding device 11 may be a so-called fixed type device that is installed in a reader or the like instead of being directly mounted in the hollow tube 1.

The sand surface meter 14 comprises a recorder 15, a synchro transmitter 16 and a synchro receiver 17, and the synchro transmitter 16 is a winding device.
It is mounted at the same location as 11, and is linked to the rotary shaft of the winding drum 12, and the synchro receiver 17 is installed in the recorder 15, and the height of the sand surface is determined based on the movement amount of the suspension wire 10. Detect and record display.

In addition, a stopper 18 is provided on the inner surface of the hollow tube 1 to set the lifting limit of the hanging fitting 5. This stopper 18
Defines the setting position of the cylindrical body 4 in the hollow tube 1 and prevents the suspension wire 10 from extending during use.
Used to zero at 18 positions. The stopper 18 also has a role of stabilizing the posture of the hanging fitting 5 and completely filling the sand. However, the above stopper
18 may be omitted.

When the stopper 18 is omitted, the upper limit setting position of the tubular body 4 is set based on the moving amount of the wire 10.

The opening / closing lid 19 provided at the lower end of the hollow tube 1 is
Although it is provided to prevent backflow at the time of penetration, other backflow prevention means may be provided.

Next, a method of constructing a sand pile covered with a water-permeable cylinder using the above apparatus will be described with reference to FIG.

First, as shown in FIG. 4 (a), the hollow tube 1 is erected on the construction ground, and the hollow tube 1 is descended through the water-permeable cylinder 4 previously attached to the hanging fitting 5. Tight wire
Connect the lower ends of 10.

Next, the winding device 11 is driven to wind the hanging wire 10,
The tubular body 4 is lifted up until the hanging metal fitting 5 hits the stopper 18 (Fig. (B)).

When the setting of the cylindrical body 4 is completed, the penetration machine 2 is operated to penetrate the hollow tube 1 into the ground. In addition, sand is introduced from the hopper 3 in parallel with the penetration of the hollow tube 1. The sand 20 passes through the cylindrical body 4 and is filled from the lower part of the hollow tube 1. The tubular body 4 is held at the set position (Fig. (C)).

The penetration is stopped when the lower end of the hollow tube 1 reaches a predetermined depth (pile bottom depth) (Fig. (D)).

After stopping the penetration of the hollow tube 1, the drive motor 13 of the winding device 11
Switch the drive torque of to small. When the total weight of the suspension fitting 5 and the suspension wire 10 acts, the torque after switching is
It is so small that the drive motor 13 rotates in the reverse direction. Therefore, the hanging metal fitting 5 descends in a state where the hanging wire 10 is tensioned, and at the same time, the unfilled portion of the tubular body 4 bends and contracts, so that the sand 20
Stop at the upper surface of ((e) figure). Thereby, the position of the substantial upper surface of the sand 20 can be grasped. The descending amount of the suspension wire 10 at this time is detected by the synchro transmitter 16 and is sent to the synchro receiver 17, and the recorder 15
It is recorded and displayed in.

Next, while pulling up the hollow tube 1, the sand 20 is discharged from the lower end of the hollow tube 1 to form a sand pile 21 in the ground (Fig. (F)). At this time, the torque of the drive motor 13 is maintained at the small torque after switching. Therefore, the hanging wire 5 is drawn out by pulling out the hollow tube 1 while the hanging metal fitting 5 is placed on the upper surface of the sand 20. Therefore, even if the hollow tube 1 is pulled out, the sand 20
The position of the upper surface of can be continuously recorded and displayed.

On the other hand, since the lower end position of the hollow tube 1 is measured by a depth meter and recorded and displayed as usual, it is possible to obtain a useful construction history by recording and displaying together with the above-mentioned recording display of the sand surface. it can. Further, when the hollow tube 1 is drawn out, the degree of the compressed air inside and the drawing speed of the hollow tube 1 can be adjusted and controlled with respect to the fluctuation of the sand upper surface.

The hollow pile 1 is pulled to the surface of the earth ((g) figure), the hanging wire 10 is then removed from the hanging metal fitting 5, and the hanging metal fitting 5 is removed from the tubular body 4 to cover the outer circumference with the tubular body 4. Complete the creation of.

In the construction method of the above-described embodiment, the winding device 11 is mounted on the hollow tube 1, and the sand level gauge 14 detects the change in the position of the hanging metal fitting 5 with respect to the hollow tube 1. For the fixed type in which the
It is possible to detect a change in the position of the ground relative to the ground.

As described above, according to the present invention, the position of the hanging metal fitting 5 is changed by the change in the amount of movement of the hanging wire 10 attached to the hanging metal fitting 5, either the relative position with respect to the hollow tube 1 or the absolute position with respect to the ground. It also includes the case of detecting.

Although the water-permeable cylinder 4 is inserted from the lower end of the hollow tube 1 in the above embodiment, it may be inserted from the upper end or the middle of the hollow tube 1 depending on the type of the apparatus. Sometimes.

〔The invention's effect〕

As described above, the sand pile building apparatus according to the invention of the present application hangs the water-permeable cylinder with the wire through the hanging metal fitting, and associates the wire with the detection unit such as the synchro transmitter of the sand level meter. Therefore, when measuring the sand surface, the hanging metal fitting and the hanging wire can function as a weight cone for detecting the sand surface and the hanging wire. Therefore, the number of wires to be passed through the hollow tube is reduced, the structure of the device is simplified, and there is no fear that the wires are entangled with each other during construction, and the maintenance is easy. Further, since the operator only has to operate one suspension wire, there is an effect that the operation becomes easy.

[Brief description of drawings]

Fig. 1 is a vertical sectional front view of the sand pile forming device, Fig. 2 is a partially enlarged sectional view of the same, Fig. 3 is a perspective view of the above-mentioned winding device, and Fig. 4 (a) to (g). The figure is a process drawing of the sand pile construction method. 1 ... Hollow tube, 2 ... Penetrator, 3 ... Hopper, 4 ...
Water-permeable cylinder, 5 ... Hanging metal fitting, 10 ... Hanging wire, 11 ...
… Winding device, 14 …… Sand gauge, 16 …… Synchro transmitter,
20 …… sand, 21 …… sand pile.

Claims (2)

(57) [Claims] 1. A flexible water-permeable cylinder is suspended in a hollow pipe for sand pile formation, the hollow pipe is penetrated into the ground, and sand is introduced into the ground. At least the water-permeable cylinder is used as the sand. In the construction method of creating a sand pile whose outer periphery is covered with a water-permeable cylinder by pulling out the hollow tube after filling it into the water-permeable cylinder, the water-permeable cylinder is connected to one end of the hanging wire via a hanging metal fitting. At the same time, the sand pile construction method is characterized in that the other end of the suspending wire is associated with the detection part of the sand level gauge, and the change in the position of the hanging metal fitting is detected by the detection part of the sand level gauge. 2. A sand pile forming apparatus in which a flexible water-permeable cylinder is suspended in a hollow pipe for sand pile formation by a suspension wire so that the suspension wire can be lifted up and down. A sand pile forming device characterized by being related.