JPH0224412A - Forming method of tamping sand pile with larger diameter and device thereof - Google Patents

Abstract

PURPOSE:To strengthen a poor subsoil easily by constraining the sides of sand and aggregate into the poor subsoil by a strong and flexible fiber-cylindrical body and forming a sand pile into the poor in an open state to the lower end thereof. CONSTITUTION:A sand pile placing device consists of a double tube formed in such a way that an internal tube 2 is inserted and fixed to the inside of an external tube 1, a hydraulic machine is fixed to the upper end of the internal tube and, at the same time, a shoe 14 capable of opening and closing is provided to the tip of the external tube. A folded flexible fiber-cylindrical body is set to a ring 12 to fix in place of the internal tube 2, closing the shoe 14 of the external tube 1, and the placing machine is force fitted into a subsoil. After that, sand and aggregate are thrown from a throwing port through the internal tube by passing through the folded flexible fiber-cylindrical body, opening the shoe 12, and the external tube 1 is pulled up to form a sand column into the subsoil.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method and apparatus for improving soft ground. More specifically, this invention binds compacted sand or aggregate with a large i diameter with a flexible fibrous cylindrical body on the whole or part of the side surface, bounds the fibrous members, and inserts the compacted sand or aggregate into a tth board. This invention relates to a construction method and device for sand piles constructed so that they are adjacent to each other.

(Prior Art) The construction of permeable sand pillars or sand piles in soft ground to drive out moisture contained in the soft ground and strengthen the soft ground is already known as the sand drain method. However, if sand pillars are created in the ground without being exposed, they will deform as the ground moves, and in some cases, the sand pillars will break midway, causing the sand pillars to lose their ability to extract water midway through the process. Ground reinforcement may not be achieved. Therefore, instead of standing the sand pillar bare in the ground, the sand pillar was surrounded and restrained with a water-permeable fiber tube and then erected in the ground. In this case, various methods were used to erect the fiber tubes into the ground.

For example, Publication No. 47-38092 proposes a method in which a steel pipe is first driven into the soil, a fiber bag is then inserted into the steel pipe, sand is poured into the bag, and the steel pipe is then pulled out. ing. In addition, the present inventor proposed the
Publication No. 8-19166 proposes a method in which a folded bag is first placed in a steel pipe, then the steel pipe is inserted into the soil, sand and aggregate are flowed into the bag, and then the bag is expanded using a vibrating rod. did.

These methods followed the trend of this era when using fiber members in soft ground, restricting the entire sand and aggregate and making sure to close the bottom end to form a bag. For this reason, it has been considered that preventing sand or aggregate from scattering is the best way to prevent the drain effect from decreasing.

Rather, the present inventor proposed that the tip of the fiber member be actively opened, and that the sand and aggregate in the open lower part remain bare and in contact with the ground, thereby creating a strong sand column that is consolidated and expanded. It has been confirmed through various experiments that the sand and aggregate, which are compacted and expanded while being bare, do not cause a decrease in the drainage effect. The idea has become different from the idea that the bottom end must always be restrained with a bag body as taught in the above-mentioned construction methods. Mata Tokko Sho 5
According to the method taught in Publication No. 0-22803, sand pile construction consists of an inner hollow tube and an outer tube suspended from above, and the hollow tube is an outer tube that can be moved up and down freely without being connected and fixed. This machine consists of a pipe and a vibrator is fixed at the upper end of the inner pipe to perform compaction.

After inserting a metal net or a rigid synthetic fiber net between this and the free outer pipe, sand or aggregate is poured into the inner compaction pipe and allowed to flow down, and at the same time, the metal net is flowed down as well. After reaching a predetermined depth, the compaction inner pipe is operated to compact the sand and aggregate at its tip, and at the same time expand the elasticity of the metal net and the rigid net to the limits of their elasticity. This is a construction method in which sand or aggregate is brought into contact with the ground using a rigid net as a boundary.

In contrast, in the present invention, a folded flexible fibrous cylindrical body is passed between the outside of the hydraulic compression plate and the inside of the outer tube and fixed at a proper position in the inner tube, so that the outer tube and the inner tube operate as one unit. Moreover, since the compaction is performed using a hydraulic compaction plate, it is structurally different from the method and apparatus taught in the above-mentioned Publication No. 50-22803. Furthermore, as for the member for restraining the sand and aggregates, the 1980-22803 publication uses a metal net or a rigid synthetic fiber net.

The present invention also differs in that folded flexible fibers are used. In addition, the difference between the previous article and the compaction method is as follows: Publication No. 50-22803 states that as shown in Figure 6A, the movement of the inner pouring pipe is first 2M to 3M from a predetermined depth.
After raising the M and burying sand, aggregate and metal net into the ground, the IM was again lowered to 2 A and compacted and expanded. In contrast to the method of repeating this operation to construct a pile pillar, in the present invention, the outer pipe and inner pipe are integrated and only pulled up in one direction as shown in Figure B, and when the pipe is pulled up 2M to 3M. During this 2M to 3M lifting process, the sand and aggregate and the flexible folded fiber members restraining them flow down and are buried in the ground. This is pressed in with a compression plate, compacted and expanded to create a sand pillar with a large diameter within the ground. 2M again
The 3M outer tube and inner tube are pulled up, the pulling is stopped, and the compression plate also rises together with it.As the lot contracts, the compression plate is pulled up to its original position, that is, the lower end of the outer tube, and is operated so as to be press-fitted downward again by hydraulic pressure. Sand pillars are created by repeating the work. Therefore, Figure-A.

There is an obvious difference in the pouring method between Fig.
This is a graph that clearly shows that it is impossible to directly apply the method taught by -22803. Also, depending on the ground conditions, the lifting of the outer and inner pipes should not be stopped at the 2M to 3M point (sometimes construction is carried out continuously with only the lifting operation).

(Problems to be Solved by the Invention) This invention is a sand pile that is compacted and expanded into soft ground by restraining the side surfaces of sand and aggregate with a strong and flexible m-wire member and leaving the upper end open. The object of the present invention is to provide a method and device for strengthening soft ground easily and quickly.

(Means for solving the problem) The inventor put sand and aggregate into a flexible fibrous cylindrical body in soft ground, made the top open at the bottom, and compacted the sand and aggregate with a compression plate. While expanding.

It was confirmed that some of the sand and aggregate flowed down from the lower end of the cylindrical body and expanded through compaction, forming a strong compacted sand column, which partially enhanced the drainage effect. The folded flexible fiber member is folded and inserted into a steel pipe, and the sand and aggregate are then flowed into the cylindrical body, and the entire casting machine is pulled up into the ground to release the folded cylindrical body and sand aggregate. It was released downstream.

At the same time, the folded fiber member is expanded by the action of the compression plate as the sand and aggregate are expanded, and the folded part of the fiber member is expanded and expanded into the ground to about twice the diameter of the outer pipe of the casting machine. As a result, we explored a method to easily create firmly compacted sand pillars in the ground, with their diametrical sides restrained by fiber members.

Therefore, the casting machine device of the present invention has a double-tube structure consisting of an inner tube and an outer tube, and the inner tube is shorter than the outer tube. Fix it to the outer tube. Also, extend the downward elongate from the hydraulic device and its length should be approximately 1 inch near the tip of the outer pipe.
and a compression plate that can be freely opened and closed is provided at its tip. The flexible fibrous cylindrical body to be inserted is folded and opened, and its upper end is pulled up with a wire and fixed in place in the inner tube. Then, drive the entire casting machine to the specified depth 3
Next, sand and aggregate are introduced from the outer tube input port and flowed down through the inner tube into the cylindrical body. After reaching the tip of the outer tube, the pouring machine is pulled up 2-3 meters and folded. It! The cylindrical body and the sand and aggregate inside it! ! It was confirmed that when the board was buried under the flow, a compression board was pressed downward at the same time, compressing and expanding the cylindrical body folded with sand and aggregate to easily create a sand column with a larger diameter. This invention was completed based on such knowledge and confirmation.

9 This application contains two inventions. One is the invention of a method and the other is an invention of an apparatus.

The invention of the method involves inserting and fixing an inner pipe into the outer pipe, installing a hydraulic compressor at the upper end of the inner pipe, fixing it to the inner pipe and the outer pipe, and making the outer pipe as long as the length of the sand pile to be constructed. Sh.

A shoe that can be opened and closed is provided at the tip, and the inner tube is shorter than the outer tube. Further, the compression rod is extended from the hydraulic compressor and its length is extended to near the tip of the outer tube, and a compression plate is provided at the tip of the lot.

This compression plate has a structure that allows it to be opened and closed freely. The folded fibrous cylindrical body is inserted into the lower end opening of the outer tube, passed between the outer tube and the compression plate, and pulled up with a wire to form the inner tube. After fixing it in place, close the shoe of the outer tube and drive the entire casting machine into the ground. As a driving device, a vibrator or a press-fitting machine is attached to the F section of the outer tube, and this force is used to drive the material.When the driving is completed to a specified depth, the sand and aggregate are then poured into the sand input port at the other end of the outer tube. At this time, the sand and aggregate pass through the inner tube and into the cylindrical body, reach the tip of the outer tube, and gradually fill the cylindrical body with sand and aggregate from below. When the filling is finished, the outer tube is closed. Undo the fixed parts of the cylindrical body fixed to the open inner tube and raise the casting machine for 2M to 3h.

When the sand and aggregate and the folded fibrous cylindrical body restraining them are buried in the ground, the compression plate is moved downward and compressed, and the 81 bundled cylindrical body with sand and aggregate is buried in the ground. The first compressor to be expanded and consolidated is pulled out by the length of the press-in, then the driving machine is pulled up again to the same extent as in A, and the compression board is lowered again by the pulled-out length. The pressure is lowered and the cylindrical body that binds the sand and aggregate is compressed and expanded. The present invention relates to an improved method of burying a large-diameter sand pillar in the ground, whose downside is restrained by a strong cylindrical body, by repeating this process to a predetermined depth up to the ground surface.

Another invention related to a device is to insert and fix an inner pipe into an outer pipe, and then equip the upper part of the inner pipe with a hydraulic compressor, which is firmly fixed to the upper part of the inner pipe and the inside of the outer pipe, and from which the downward rotation is extended. The length is such that it reaches the tip of the outer tube, and a compression plate that can be opened and closed is attached to the tip of the lot, and this compression plate is designed to compress sand and aggregate. The length is about IM to 2-. In addition, a shoe that can be opened and closed at the lower end of the outer pipe is set so that it is closed when driving and opened when pulling up.The length of the outer pipe is as long as the sand pile can be made, and the upper part of the inner pipe is filled with sand and sand. Provide an input port for aggregate. The input port is provided on the outside of the outer tube by connecting the inner tube and the outer tube with a tube.

The inner tube is shorter than the outer tube, and a wire winding device is installed on the outside of the upper end of the outer tube, and the length of the wire extends to the lower end of the outer tube, and at its tip, the top and bottom are opened and folded into a flexible fibrous cylindrical body. Clamp and secure the upper end and pull upward. During hoisting, the length of the flexible folded cylindrical body that passes between the inside of the outer pipe and the outside of the compression plate, and is rolled up and fixed to the fixing device at the appropriate location on the inner pipe, is the length of the sand pile construction. However, depending on the ground, the length of the cylindrical body may be limited to the middle, and it may be constructed with the cylindrical body suspended in the middle.In this case, the sand and aggregate are restrained halfway by the cylindrical body. Below that, the shape will be bare and in contact with the ground, but it will be adopted depending on the ground condition.When pouring, first roll up the folded flexible fibrous cylindrical body and fix it in place in the inner pipe, and then Close the shoe at the lower end of the outer tube, place the closed side down, and drive to a predetermined depth.1.Next, sand and aggregate are allowed to flow down through the inner tube from the sand inlet of the outer tube.At this time, the sand and aggregate flowing down from the inner tube are The sand and aggregate pass through the inside of the cylindrical body and reach the lower end of the outer pipe.Then, when the casting machine is raised upwards, the sand, aggregate, and the folded cylindrical body with the sides restrained flow down and are buried in the ground. .

The lifting length is 2M to 3M, and at the same time as the lifting is finished, the compression plate is lowered by hydraulic pressure, compressing and expanding the sand and aggregate buried in the ground and the folded cylindrical body that restrains them. This is a device in which compacted and consolidated sand piles of large diameter are constructed in the ground with their sides restrained.

(Example) Of these two inventions, first the invention of the device will be explained based on the drawings. Fig. 1 is an overall view of the present invention, Fig. 2 is a diagram showing the relationship between the folded flexible cylindrical body and the fixing device for fixing it in place in the inner tube, and a diagram of the state of the wire for winding up the cylindrical body from above. Figure 3 is a partially cutaway cross-sectional view of the positional relationship of the outer pipe.The flexible fibrous cylindrical body folded into the ground between the outer pipe stations opens and sand and aggregate are pushed downward and to the sides by the pressure of the compression plate. Figure 4 shows a partial view of the tube being expanded and compressed and expanded, with the outer tube shoe opening and the rod being press-fitted downward, and the compression plate at its tip about to open.

A diagram of the relationship between the outer tube and the compression plate only, Figure 5 is a sketch of the folded flexible fibrous cylindrical body, Figure 6 is a pouring monograph, Figure A is a pouring procedure diagram from the Japanese Patent Publication Publication No. 1983-22803, and Figure B is a diagram of the pouring procedure. 1 is a schematic diagram of the pouring and forming process of the present invention. This is a comparison graph that clarifies the differences depending on the pouring method. In Figure 1, (1) is the outer pipe, (
2) is an inner tube (3) that is a flexible folded cylindrical body, and (4) is an obturator (shu) that is attached to the tip of the outer tube that can be opened and closed freely.(5) is a hinge that allows the shoe to be opened and closed freely. 6) is a compression plate, and (7) is a lot (8) connected to a hydraulic machine.
(9) is the input port for sand and aggregate, which passes through the outer pipe and is connected to the inner pipe. (10) The input port is closed when blowing compressed air into the inner pipe. A state diagram showing the ring and the ring being fixed in place on the inner tube when winding up with a wire.

(13) Oil pipe, (14) Lower end of outer pipe (15) Winding wire (16) a! A lifting motor (17), a tool for fixing the upper end ring of the folded flexible cylindrical body in place in the inner tube, and (18) a compressed air outlet are shown.

The equipment according to the present invention consists of a double tube in which an inner tube (2) is inserted and fixed into an outer tube (1), and a hydraulic machine is fixed at the upper end of the inner tube. The length of the inner tube (2) is shortened to within one third of the length of the outer tube (1), and the outer tube (2) is lengthened by the length to be improved.
A shoe (14) that can be freely opened and closed is provided at the tip. When the pouring machine is on the ground - F, the folded flexible fibrous cylindrical body is set in the ring (12) and rolled upward with the wire (15) as shown in the 5-part diagram in Figure 2.
16) When rolling the folded flexible fiber cylindrical body that drives the winding motor, fix the upper end of the cylindrical body to the ring (12), insert it from the lower end opening of the outer tube, and then Pass it between the inner compression plates and fix the inner tube in place. Electrical or mechanical power may be used to power the fixture for fixing.

To explain with an example, first, the folded flexible fibrous cylindrical body is wound upward from the large opening between the lower ends of the outer tube with a wire and fixed in place on the inner tube.Next, the shoe at the tip of the outer tube is closed.
Press the entire casting machine into the ground with the closed side facing down using a vibrator or a press-in machine. After reaching the total depth, stop the press-in and input sand aggregate from the input port, but the sand and aggregate do not It passes through the inner tube, then through the folded flexible fibrous cylindrical body, and a portion reaches the tip of the outer tube. After that, the shoe of the outer tube is opened and the outer tube is pulled up, and the length of the outer tube is 2 to 3 meters, and the flexible fibrous cylindrical body folded with sand and aggregate for that length is buried in the ground. be done. Lot (7) at the same time as this pull
) and the compression plate (6) cause a downward press-fitting movement, and the sand and aggregate buried in the ground and the flexible folded fibrous cylinder are compacted and expanded by this compression force, and the diameter is expanded into the ground. Forms a large pillar of sand. In this case, the movement of the outer tube is only that of being pulled in two directions.

゛Continuing the explanation of the present invention, the pouring machine is 211I3.
After pulling up the A, the compression plate goes down IM ~ 2- and press-fits the F side part, then it is pulled up again and reaches the lower end of the outer tube, then the entire casting machine is pulled up again by 2M ~ 3M, and the compression plate is pressed again. This is a construction method in which sand is pressed downward into the ground, and this process is repeated to gradually create a compacted sand column in the ground, with all or part of the sides of the large diameter restrained and compacted. moreover! '# Adding an explanation to the rope, the time the casting machine is raised 2M to 3M and stopped is enough time for the compression plate to expand and consolidate the flexible cylindrical body folded with sand and aggregate. The duration is between 3 minutes and 3 minutes. These 2 minutes~
3 minutes is the time confirmed from various examples.At the same time as the zero-order expansion is completed, the casting machine is pulled upward again, and the compression plate is also pulled back by the length of the extension. It was invented based on the novel idea of compacting sand and aggregate by moving the compression plate up and down in this way. Furthermore, to explain the shape of the upper part of the pouring machine, the outer tube is a steel tube with a diameter of 401 to 50 cm, which is firmly fixed and integrated.2 The diameter is 30C11 to 401, and the strobe has a strong pressure with an extension of 2 to 3M. 2 The funnel connected to this and extending to the tip of the lower outer tube is a steel rod I'! fi is 10cm~15
Use a strong one. The input port of the inner tube has a diameter of 201 mm.
A steel pipe with a grade of about 2201 is used as an inflow steel pipe, passes through the outer pipe, and is connected to a hopper at the other end of the outer pipe. Hopper is 501
Make a square cocoon and form a sand inlet. Also, a portable sand pile with a capacity of 1 day is used by the leader, which serves to constantly replenish the shortage as the diameter of the sand pile increases.

For example, the amount of sand filled in the outer tube for the first time is 5M~
Naturally, when it was raised 6M, there would be a shortage of sand. In this case, by using this moving direction, the insufficient amount is replenished from the upper hopper mouth and construction is carried out.

Sand and aggregate pass through the inner pipe inlet from the hopper mouth.

This inner pipe inlet, through which the liquid flows down the inner pipe and fills the cylindrical body, is provided at a position 201 to 30 cm from the lower end of the hydraulic machine. Furthermore, the fixed mounting position of the folded flexible fiber cylindrical body can be cast by a structure of the F part of the casting machine such as 0 or more, which is provided below the input port of the inner tube at 5C11 to IOa++.

The flexible fibrous cylindrical member is made of strong fibers 1, such as synthetic fibers such as nylon, polypropylene, polyester, etc., and is used as a coarse cloth-like cylindrical body whose top and bottom are open. The length of the cylindrical body may be long up to the tip of the outer tube (or may be shorter than that; a short one is used suspended midway inside the outer tube. This is a novel compaction method that can quickly and reliably create sand pillars with a planned diameter to a predetermined depth in the ground.
i! The economic efficiency of completing the sand pile within the plan without using more than the quantity was taken into account.
The figure shows the relationship between the fixing device for the folded fiber tube, the winding wire, and the inner and outer tubes. Figure 4 is a diagram showing the state in which the compression plate is being compressed and expanded, and Figure 4 is a diagram showing the relationship between the compression plate being press-fitted downward and the compression plate about to open, and the outer tube. Figure 5 is the same as the folded shape of the cylindrical body. No. 6IA is a comparative monograph between Japanese Patent Publication No. 50-22803 and the present invention.

'illΔ “4 -1 Nishiki i1 (41) (A field) Gin 呵 (Kara 1st eye

Claims (1)

[Claims] 1. A flexible fibrous cylindrical body with its upper and lower ends open, folded to a smaller diameter, or partially sewn together, and then press-fitted or driven into the ground to a predetermined depth. Next, the cylindrical body is filled with sand or aggregate and at the same time compressed and expanded by a compressor, the folded portion of the cylindrical body is naturally expanded and the filled sand and aggregate are compressed and expanded. This is a compacted sand pile construction method with a large diameter, which is characterized by the fact that columnar foundation piles with a large diameter are left buried in the soil. 2. The pouring machine consists of an outer tube and an inner tube. A vibrator is installed at the upper end of the outer tube, a compressor is installed at the upper end of the inner tube, and a rod connected to this extends downward, with a rod at its tip that can be opened and closed freely. The upper end of the flexible fibrous tube, which is folded or partially sutured, is tied with a wire, pulled upwards, and fixed to the fixing device in the appropriate position of the inner tube, and an obturator that can be freely opened and closed is placed at the tip of the outer tube. Penetrate into the ground with the closed side facing down, and after reaching a predetermined depth, sand and aggregate are introduced from the input port on the outside of the outer tube.The sand and aggregate pass through the inner tube and enter the cylindrical body. Then, the entire pouring machine is pulled up to open the obturator, and at the same time, the flexible fiber cylinder is released from the fixing point, and then the compressor is operated downwards to fill the outer pipe from the bottom end. A device that expands and compacts a flexible fibrous cylindrical body that has flowed down and is buried in the ground, and the sand and aggregate that fills it with a compression plate.