JPH02209518A - Method for insertion of ground foundation modifying material - Google Patents

Abstract

PURPOSE:To shorten the construction period and reduce the cost by fitting by pressure a new casing using a mobile type pressure-fitting drawoff machine, fitting by pressure a drain material while casing behind is being drawn off, and thus creating piles underground, wherein this cycle of works shall be made repeatedly. CONSTITUTION:Casings C1-C5 are pinched in a chuck 1 of a pressure-fitting drawoff machine A for casing and fitted into the ground by pressure one after another to form a train of casings. Then a mast 2 of the pressure-fitting drawoff machine A is inverted 180 deg., and the casing C1 already fitted by pressure with the chuck 1, and from the top thereof a pipe 3 for pressure fitting of drain material is inserted, and drain material 10 such as sand, crushed stones, quick lime, etc., is put into the casting C1 so as to create piles 10a underground. The mast 2 is inverted while the casing C1 is left pinched by the chuck 1, and upon putting into adjoinment with the casing C5, the casing C1 is fitted by pressure. This cycle procedures is repeated to accomplish a trains of piles 10a in the ground foundation with no vibration and noise, and thus the ground foundation is improved.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method of inserting a soil improvement material into the ground to be used in soil improvement work, and particularly relates to a method of inserting a casing into the ground using a self-propelled press-in/pull machine. By construction.

Concerning the construction method of installing piles or cardboard underground.

(Conventional technology) Ground improvement methods are aimed at actively improving the properties of the ground or soil and economically constructing foundations and structures, and the following methods have traditionally been adopted: has been done.

The vertical drain construction method is based on the improvement principle of consolidation drainage, and is a construction method in which sand pillars or cardboard are installed in the ground to shorten the drainage distance and consolidate the viscous soil.

The compaction pile construction method, which uses compaction as the improvement principle,
A pile with a diameter of 1.2 to 2 times the diameter of the casing is constructed using sand or crushed stone, and when the pile is constructed, it is compacted by applying vibrations or blows.

Consolidation methods include chemical consolidation methods and physical consolidation methods. Chemical consolidation methods utilize the cohesive action of stabilizers such as lime and cement, and include chemical injection methods and deep mixing methods.

(Problems to be Solved by the Invention) The conventional construction methods described above all require the use of large machines such as augers, crawler cranes, vibrators, and base machines during construction. Therefore, if the site is on soft ground, consideration must be given to the strength of the embankment, etc., to ensure that trafficability (ability of the ground to withstand vehicle traffic) is not insufficient.

Furthermore, temporary construction work may be required to install the equipment, resulting in problems such as longer construction times and higher costs.

Furthermore, the vibration and noise generated during the work are large, making it difficult to work near private houses or structures, and it is impossible to work in narrow sites or in areas where there are obstacles above.

These ground improvement works are often carried out intensively over a relatively short period of time, and machinery and equipment are required to be used during a certain period of time.

It is not possible to depreciate equipment, etc. Therefore, it has been desired from the viewpoint of cost reduction to downsize or use common equipment, equipment, etc. as much as possible, even though there is a wide variety of equipment.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method for inserting a ground improvement material that can be installed in a short period of time, without consideration of trafficability, without vibration or noise.

(Means for Solving the Problems) In order to solve the above problems, the present invention is a press-fitting and pulling machine that press-fits a plurality of casings into the ground and is capable of self-propelled movement on the rows of casings. A new casing is press-fitted to the side, and then the rear casing is pulled out using a press-in/pull-out machine, drain material is thrown into the casing to create a pile in the ground, and then the pulled-out casing is moved to the front of the casing row. Or it is characterized by being press-fitted laterally. Further, the present invention is characterized in that a cardboard is attached to a casing that is press-fitted into the ground, and that the cardboard remains in the ground when the casing is pulled out.

(Operation) Casings are sequentially press-fitted by a press-in/pull machine that moves on the existing casing rows. After press-fitting a certain number of casings, press-fitting is stopped and the rearmost casing is pulled out using a press-in/pull-out machine, or multiple press-fit/pull-out machines are used, and press-in and pull-out are performed using separate press-fit/pull machines.

At the same time as the extraction, drain materials such as sand, crushed stone, and quicklime are put into the casing to create a pile underground. Thereafter, this pulled out casing is press-fitted into the frontmost part of the casing row or the side thereof.

By repeating this process, a pile row is constructed.

(Example) Next, the present invention will be explained in detail based on the drawings.

FIG. 1 is an explanatory diagram of the casing being press-fitted according to the first embodiment;
FIG. 2 is an explanatory view of the casing being pulled out, and FIG. 3 is an explanatory view of the pulled out casing being press-fitted again.

The first embodiment is a casing press-in/extraction machine A as shown in the figure.
One unit is used to press-in and pull out the casing. This press-in and pull-out machine A can also be used as a pile press-in and pull-out machine for steel pipe piles.

First, as shown in FIG. 1, the casings C1 to C5 are held in the chuck 1 of the press-in and pull-out machine A, and are sequentially press-fitted into the ground to form a row of casings.

Next, as shown in FIG.
180 degrees, and clamp the already press-fitted casing C1 with the chuck.

A vibrator 3 for press-fitting a drain material is inserted into the upper end of the casing C1, and a drain material 10 made of sand, crushed stone, quicklime, etc. is introduced into the casing C1 through the vibrator 3. After that, if you pull out the casing C1, there will be a pile 10a underground.
is being created.

When the pile 10a requires consolidation, such as a compaction pile, an I! i Compact the drain material with compaction jack 5] and pile it into a pile]
, While creating Oa, the casing C1 is pulled out.

The other side of this compacted drain material 10 is shown in FIG. In this example, the tip of the casing C is configured to be openable and closable using the opening/closing parts Ca, Ca. When pulling out the casing C, open the openings Ca and Ca at the tip and insert the drain material 10 inside (Fig. 5(a)), then close the openings and closing parts Ca and lower the casing C to release the drain material 10. (Fig. 5(b)).

When consolidating the drain material 10, a strong consolidating force is obtained because the existing casing acts as a reaction force.

In addition, the compaction force is clearly determined by the pressure gauge and can be set freely.6 After pulling out the casing C1, while holding the casing C1 in the chuck 1, the mast 2 and the chuck 1 are connected again to the 18
Invert the casing C1 by 0 degrees and press-fit the casing C1 adjacent to the casing C5 (see Fig. 3). After press-fitting the casing C1, move the press-fitting/extracting machine A in the direction of movement (in the direction of the arrow in the figure) to press-fit the casing C1 into the casing C1. Move by yourself.

While pulling out the casing C2 in the same manner as above,
The casing C2 that has been pulled out is then press-fitted into the front of the casing row.The existing casings C3 to C5 are also successively moved forward and press-fitted in the same manner.

Note that the piles 10a may be created for each of the casings C1 to C5 as in this embodiment, but
If necessary, the casings C1 and C3 may be formed at appropriate intervals.

In addition, as shown in FIG.
By appropriately rotating the casings Cn, Cn, .

Furthermore, the press-in/pull-out 11A can change its direction of movement by moving onto this casing Cn.

By repeating this process, piles 1. Oa rows can be constructed and the ground can be improved.

As described above, this embodiment uses a static load type press-in and pull-out machine, so that it obtains a reaction force from the existing casing when press-fitting and pulling out the casing, and can also move by itself on the row of casings. Therefore, one work can be done without vibration or noise.
It is possible to work adjacent to houses and structures, and the hardness or softness of the ground can be accurately determined by the degree of force used to press the casing into the ground.

Furthermore, on soft ground, there is no need for equipment to move on the ground, so embankments are not required. 5 In particular, construction can be carried out on swamps, ponds, beaches, etc., and on extremely soft ground without embankments. Therefore, temporary construction work is not required and the construction period can be shortened. Also,
At sites where there is an upper obstruction, short casings can be added and press-fitted to create a longer casing.

Moreover, in this embodiment, only one press-in and pull-out machine is required, so the cost can be reduced, and construction can be carried out even in narrow spaces.

The second embodiment is a method that uses two press-in and pull-out machines, a first press-fit and pull-out machine A and a second press-fit and pull-out machine B, as shown in FIG.

That is, the casings C1,1 to C25 are
is press-fitted, and the new casing C26 is press-fitted by using the casing as a reaction force while self-propelled on the press-fitted row of casings.

A self-propelled movable lane K is installed above these press-fitted rows of casings, and a second press-fitting and extracting machine B is installed behind the rows of casings.

Next, the press-fitted casing C1l is transferred to the second press-fitting/pulling machine B.
At the time of extraction, drain material such as sand, crushed stone, quicklime, etc. is put into the extraction area to create a bail. In this embodiment, as in the first embodiment, when a pushing force is sequentially applied to the pile during pulling out, the drain material is compacted and compacted.

Next, after the casing C1,1 was pulled out by the press-in puller B, the casing C1l was lifted up by a crane.

Attach it to the chuck 1 of the press-in and pull-out machine A, and remove the casing C1l.
is press-fitted adjacent to the front of the casing C26. After press-fitting, move the first and second press-fit/extraction @A, B, and crane K forward (in the direction of the arrow in the figure) on their own.

Similarly, the piles 10a are sequentially created while pulling out the casings C12 to C25 one after another, and the pulled out casings C12 to C
25 in order to the front.

In addition, pile 1. The Oa may be formed at appropriate intervals, such as the casings C1l and C13, as in the first embodiment.

By repeating the above operations, the rows of piles 10a can be constructed on the ground without vibration and noise.

In this embodiment, the casing press-fitting work at the front and the casing pulling out work at the rear can proceed simultaneously, allowing for faster construction.

In both the first and second embodiments, casings and casings for installing cardboard boards are installed underground to create piles for various vertical drains such as sand drains, sandstone pile sand, sandstone compaction piles, and lime piles. It can be used in any way. Also, deep mixing method,
It can also be applied to other ground improvement methods such as chemical injection method.

When using the sand drain method according to the above example,
The degree of compaction of the pile can be determined by applying pressure to the drain material during pile construction, so the supporting capacity of the pile can be controlled.

Further, when the cardboard drain construction method is performed according to the above embodiment, the cardboard is left in the ground by press-fitting and pulling out the casing.

(Effects of the Invention) According to the present invention, work can be performed adjacent to houses and structures without the harmful effects of vibration and noise, and the hardness and softness of the ground can be accurately determined. Additionally, embankments, temporary construction, etc. are not required regardless of the ground condition, making it possible to shorten construction period and reduce costs. Furthermore, since the device is small, it can be used even in confined spaces and has the advantage of widening the scope of work.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention. Fig. 1 is an explanatory diagram of the casing of the first embodiment being press-fitted, Fig. 2 is an explanatory diagram of the casing being pulled out, and Fig. 3 is an explanatory diagram of the casing being pulled out. An explanatory diagram during re-press-fitting and FIG. 4 are work explanatory diagrams of the second embodiment,
FIG. 5 is an explanatory diagram showing another example of the method of compacting the drain material, and FIG. 6 is an explanatory diagram of another example showing the press-fitting state of the casing. A, B...Press-in/extraction machine K...Crane...
Chuck 101.・・・Drain material 10a・
・・Pile C, C1-C26, Cn-casing

Claims (2)

[Claims] (1) Press-fit multiple casings into the ground, press-fit a new casing into the front or side of the casing row using a press-in and pull-out machine that can move on the casing row, and then use the press-fit and pull-out machine to A method for inserting a ground improvement material, which comprises: pulling out a casing, inserting a drain material into the casing to create a pile in the ground, and then press-fitting the pulled out casing into the front or side of a row of casings. . (2) Multiple casings with cardboard attached are press-fitted into the ground, and a new casing and cardboard is attached to the front or side of the casing row using a press-in/extraction machine that can move on its own on the casing row. press-fit, then pull out the rear casing with a press-in puller, leave the cardboard remaining in the ground, and then attach a new cardboard to the pulled-out casing and press-fit it to the front or side of the casing row. A method for inserting a ground improvement material characterized by: