JPH06193048A - Underground stirring device for civil engineering work - Google Patents

Abstract

PURPOSE:To form by one effort an underground structure in which soil cement columns having mutual overlap parts are integratedly formed in the ground. surely and reliably. CONSTITUTION:Three rotary shafts 16, 16, 16 are provided side by side on the leader 3 of a carriage 2, and underground mixers 200, 200, 200 are respectively provided on the extreme ends. A center casing 20' are formed into a circular arc shape against both side drum casings 20, and within respective ones, inward projecting fixed stirring blades 23 and outward projecting fixed stirring blades 24 are respectively provided on outer shafts 18 and inner shafts 19. The outer shaft 18 is provided with an improvement material injection noizzle 25, provided with bit type stirring blades 27, 27' on the extreme end, and soil cements 11, 11 having mutual overlapping parts 12 are integratedly formed by means of them by one effort. Hereby, the soil cements 11, 11 having mutual overlapping parts 12 in the lateral direction are integratedly formed by one effort in the ground 1 which can not be visually observed from the ground surface, and a reliable underground structure having accuracy in accordance with the design can be built.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The disclosed technology belongs to the technical field of the structure of an apparatus for performing soft ground improvement and a predetermined civil engineering work in the ground such as a continuous underground wall of columns.

[0002]

BACKGROUND OF THE INVENTION As is well known, the land is narrow and there are many mountainous areas and forest areas. In addition, the complex and long coastline is approaching, and it is effectively used for agricultural land, urban houses, enterprise factories and other facilities. In Japan, where the plains that can be formed are limited terrain conditions, effective use of land is extremely important, and it is possible to use land by design such as land reclamation of shallow shores, rivers, lakes and basins, dredging, etc. The soft ground improvement work for flattening through the ground is extremely useful, and various research and development have been made since ancient times, various improvements have been added to practical use, and numerous achievements have been made with the expansion of social capital. However, recently, improving materials such as cement milk are injected and fed into the ground, mixed and agitated with the drilling soil, and solidified over time to form a continuous row of underground columns, foundation piles, and soft ground improvement structures. The technology to build is put to practical use and widely used To briefly explain this technique with reference to FIG. 11, a casing pipe or an auger 5 is installed at the base of the drive unit 4 along the leader 3 of the trolley 2 loaded and set in a predetermined area of the ground 1, and the cutting is performed. The hole 6 is excavated, and an improved material such as cement milk from the batcher plant 8 is fed from the swivel joint 7 to form the hole 6.
Mix and stir with the soil inside and solidify over time to form a soil cement column to form foundation piles 11 and continuous underground columns 13
To improve soft ground.

When constructing foundation piles, etc., there is a risk that the drilling holes 6 will be roughened by the casing pipe, the auger 5, etc., and that groundwater will penetrate into the drilling holes 6 due to the collapse of the drilling wall. Therefore, as shown in FIG. 11, a drum-type underground mixer 10 is provided at the tip of the casing pipe or the auger 5.
An improved technology has also been developed to deal with these problems by installing the method and has been introduced in some constructions.

[0004]

However, as shown in FIG.
As shown in Fig. 2, in order to form the column-column continuous underground wall 13 in the ground 1 of the foundation pile 11, in order to maintain its reliability, strength and rigidity, A design for forming the overlapping portion 12 is indispensable, but as shown in FIG. 11, the drilling holes 6 and 6 are formed adjacent to each other to form the underground structure 13 shown in FIG. Has a drawback in that the set pitches of the trolleys 2 must be close to each other, extremely complicated work is required to secure the work accuracy, skill is required, and control management is complicated.

In particular, as shown in FIG. 13, in order to group the foundation piles 11 vertically and horizontally in a plan view with the overlapping portions 12 interposed therebetween, separately from the column row continuous underground wall 13 shown in FIG. Since a three-dimensional arrangement is required, it is extremely difficult to reliably form the overlap portion 12 in the longitudinal direction by design, and in particular, the ground cannot be installed while visually observing from the ground. There is a disadvantage in that the work through the inner hole 6 requires extremely high construction accuracy.

[0006]

The object of the invention of the present application is to excavate a single drilling hole in the ground based on the above-mentioned prior art by adjoining each other, and feed the soil and the casing pipe or auger through a swivel joint. Foundation piles and columns with continuous underground wall by solidification with time through mixing with cement milk and other improving materials,
The technical problems that should be solved in the construction of soft ground improvement should be solved.At the same time, multiple parallel foundation piles should be formed all at once while ensuring mutual overlap through excavation of multiple drill holes. Form a continuous underground wall with strong and rigid columns and a soft ground structure, and prevent the intrusion of groundwater due to roughening of the drilling hole or collapse of the drilling wall during that time, so that the underground structure as designed can be obtained. The present invention aims to provide an excellent underground stirring device for civil engineering construction, which is beneficial to the field of civil engineering application in the construction industry.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the structure of the invention of the present application, which is based on the above-mentioned object, is drilled in a predetermined soft ground in order to solve the above-mentioned problems. Then, improve material such as cement milk is fed to the soil in the drilled hole, mixed and stirred with the soil to uniformly disperse,
When solidifying with time to form soil cement, etc., to form foundation piles and underground piles such as continuous pillar rows underground walls and to carry out the prescribed civil engineering work, use a crawler type bogie in the ground area concerned. A set of carry-in is installed, and a predetermined number of rotary shafts are provided along the leader, and each rotary shaft is a double shaft consisting of an inner shaft having an improved material feeding passage and an outer shaft loosely mounted on the inner shaft. Thus, a drum casing is fixedly provided at the front end of the outer shaft, and one drum casing is of a fixed type having a pair of arc partial cross sections, and the drum casings on both sides are rotatable, and , The drum casings are integrally connected to form a static double casing. For each drum casing, the inwardly fixed stirring blade is connected to the outer shaft, and from the inner shaft, the outward stirring blade is connected to the drum casing. Not to reach Then, the inward stirring blade and the outward stirring blade are made to rotate in opposite directions relative to each other, so that the soil in the drilling hole is crushed, torn, mixed and stirred, and co-rotation is prevented for the soil in the drilling hole, Improved material such as cement milk that eliminates rough skin, prevents holes from collapsing, prevents groundwater intrusion, and is fed from a swivel joint above the nozzle installed at a predetermined part of the inner shaft during the pulling process from a predetermined depth. To the crushed soil in the casing, mix and stir with each stirring blade to make it evenly dispersed, and as the drum casing rises, the soil and the improving material intermingle through diffusion and uptake, and the underground pile material As a result, they overlap each other in the lateral direction and are continuously connected and solidified in the longitudinal direction and the lateral direction. After the hoisting, the bogie is moved laterally by one step and the above process is repeated. , Constructing foundation piles, continuous underground walls of pillar rows, and structures for improving soft ground, which are interconnected in the lateral direction in the predetermined size and length, or in the lateral and longitudinal directions, and those constructions Is as designed,
It has rigidity, sufficient construction reliability is obtained, shortening the construction period,
The technical measures have been taken to reduce costs and ensure safe construction.

[0008]

EXAMPLE An example of the invention of this application will be described below with reference to FIG. 11 and subsequent figures and with reference to FIGS.

It should be noted that parts having the same aspects as in FIG.

In the embodiment shown in FIGS. 1 to 9, reference numeral 14 is an underground mixing device for civil engineering work which constitutes the subject matter of the invention of the present application. In the embodiment, a foundation pile 1 of three underground piles is used.
This is a mode in which the lateral overlapping portions 12 are formed on each other to form a series of 1, 11, 11 and a leader 3 is erected on the crawler type carriage 2 shown in FIG. 3, a frame 15 is provided so as to be movable up and down, three rotary shafts 16, 16, 16 are set in a horizontal direction via an upper rotary drive device 4, and tie links 17, 17 having bearings corresponding to the inside are provided. The lateral mutual spacing is always maintained.

Each rotary shaft 16 has a hollow inner shaft 19 having therein a passage 19 'for feeding the cement milk 9 of the improving material, and a ring-shaped gap of a predetermined size in the inner shaft 19. The outer shaft 18 is loosely inserted, and the rotary shaft 1
At the lower end of 6, as shown in FIG. 9, there are three underground mixers 200, 200 forming one unit on both sides and 200 'in the center.
6, the underground mixers 200 on both sides are fixed, and as shown in FIG. 6, a drum casing 20 having a circular cross section is provided to the outer shaft 18 of the rotary shaft 16, and Inward fixed stirring blades 23, 23 having a spiral cross-section are fixed in the axial direction by a predetermined number of steps between the collar 22 and a predetermined number of collars 22, 22 provided on the inner shaft 19 via a minute ring-shaped gap. , The inner shaft 19 is provided with stirring blades 24, 24, ... Also having a spiral cross-section between the fixed inward stirring blades 23, 23 so that their outer ends do not hit the drum casing 20. 23, 23 ... Provided with a predetermined number of steps so as not to interfere with each other, and improver injection nozzles 25, 25 communicating with the pressure-feeding passage 19 ′ of the improver 9 for cement milk are opened, and at the tips thereof. Bit type stirring blade 7 'are integrally side cast.

In the underground mixer 200 'at the center, as shown in FIG. 7, a pair of casings 20', 20 'having a pair of arc-shaped cross sections are provided on the outer shaft 18 of the rotary shaft 16 and , An inwardly fixed stirring blade 23 having a predetermined number of axial steps and having a spiral cross section is fixed between the inner shaft 19 and a collar 22 which is loosely mounted via a predetermined ring-shaped gap, and the inner shaft 19 is fixed outwardly. The stirring blades 24, 24 ... Are also provided with a predetermined number of axial steps in a posture in which the tips do not reach the casing 20 ′ and do not interfere with the inward stirring blade 23.

The inner shaft 19 is provided with the improving material injection nozzles 25, 25 which communicate with the stirring material feeding passage 19 'therein.
Is opened outward, and a bit type stirring blade 27 is laterally fixed to the tip.

Thus, the underground mixers 200, 20 on both sides
0 is the outer shaft 18 of the rotary shaft 16 and the inward fixed stirring blade 23.
The casing 20 'of the central underground mixer 200' rotates with the two underground mixers 200,
As shown in FIG. 1, a part of the casing 20 of the underground mixer 200 on both sides is inserted into the slits 21 and 21 on both sides of the casing 21 so that the slits 21 and 21 do not rotate.
As shown in FIG. 5, the loci in the vertical direction form the overlapping portions 44, 44 in the horizontal direction.

As shown in FIG. 2, the bit-type stirring blades 27, 27 ', 27' at the tip of the inner shaft 19 of the mixers 200, 200, 200 'all over the place have a large size of the central stirring blade 27, Those on both sides are made relatively small so that the formation of the overlapping portions 44, 44 can be ensured.

Then, as shown in FIG. 3, the rotation driving device 4
The output shaft 29 of the motor 28 in the inside is gears 30, 31, 32,
Underground mixers 200, 2 on both sides via 33, 34, 34
The outer shafts 18, 00 and the inner shafts 19 of 00 are provided with relative reverse rotation at a predetermined speed, and only the inner shaft 19 of the central underground mixer 200 'is rotated so that the outer shafts 18 are rotated. Does not rotate, and as described above, the casing 20 'of the central underground mixer 200' is connected to the underground mixers 20 on both sides.
It is made to stand still for 0,200.

Further, as shown in FIG. 9, a swivel joint 7 is provided at a predetermined portion of the three rotary shafts 16, 16 and 16, and a swivel joint 7 is provided inside the inner shaft 19 of the swivel joint. A predetermined improving material 9 such as cement milk is pressure-fed from the batcher plant 8 through the swivel joint 7, and the injection nozzles 25 feed the underground mixers 200, 200.
It is sprayed into the inside of the hole and stirred with the soil in the drilled hole 6 to be uniformly dispersed and mixed.

The underground mixers 200, 20 on both sides
0 and the power transmission mechanism for the central underground mixer 200 'are as shown in FIGS. 3, 4 and 5, and the drum casings 20, 20 of the underground mixers on both sides and the central underground mixer 200' are provided. The rotation force, rotation direction, and rotation speed with respect to the casing 20 ′ and the stirring blades 23, 24, 27, 27 ′ in these underground mixers are as shown in FIG.
It can be set in advance according to the gear ratio in the gear mechanism shown in FIGS.

Thus, the underground mixers 200, 20 on both sides
Bit 2 at the end of drum casing 20 'at 0
6 is formed as shown in FIG. 6 and is crushed when forming a hole,
The drilling hole 6 is made to be drilled with tearability, the soil in the drilling hole 6 is relatively penetrated into the inside, and the stirring blades 23, 24,
Crushing, breaking and stirring, and dispersion and mixing of the cement milk with the improving material 9 are carried out uniformly by 27 and 27 '.

In the above-mentioned structure, the carriage 2 is loaded and set in a predetermined improvement area, the leader 3 thereof is erected, and the drive unit 4 is installed.
At the same time, the frame 5 is set, the rotary shafts 16 are erected, the underground mixers 200, 200, 200 'are directed to the formation site of the drilled holes 6, and the open / close valve (not shown) of the swivel joint 7 is closed. By driving the driving device 4, the underground mixers 200, 200 on both sides are
The drum casings 20 and 20 of the rotor rotate, and the drilled holes 6 are formed through the bit type stirring blades 27 and 27 '.
The soil penetrates into the drilled hole 6 and the stirring blades 23, 24, 2
It is crushed and broken by the relative reverse rotation of 7,27 'and mixed and stirred.

In this descending process, the opening / closing valve of the swivel joint 7 may be opened and the improving material 9 may be injected from the lower injection nozzle 25.

During this time, the hard drilling 6 is formed by appropriately operating the vibro device (not shown) for the hard formation.

The underground mixers 200, 20 on both sides
No. 0 drum casing 20 rotates as described above,
The casing 20 'of the central underground mixer 200' is kept stationary, so that the trajectory of the descending drilling process forms an overlapping portion 44 in the mutual trajectory as shown in FIG. The mixed and stirred soils will overlap each other in the lateral direction.

Then, when the predetermined depth is reached (which is appropriately detected by the depth gauge), the drive device 4 rotates in the reverse direction, and the rotating shaft 6 moves together with the frame 15 by the operation of the winch (not shown) of the carriage 2.

Then, an opening / closing valve (not shown) of the swivel joint 7 is opened to feed the improved material from the batcher plant 8 through the swivel joint 7 into the improved material feeding passage 19 'in each inner shaft 19, and to inject the tip portion. Nozzle 25, 25
Spraying to the soil in the drilling hole 6 and each stirring blade 23, 24, 2
7,27 'is stirred, mixed and dispersed in a uniform state, and solidified with time.

In this case, the improvement material 9 is applied to the upper injection nozzle 2
It is desirable to start from 5.

In the meantime, as shown in FIG. 1, in the mixers 200, 200 'all over the place, the inward fixed stirring blades 23 and the outward stirring blades 24 are axially arranged vertically in a predetermined number of multiple stages.
In addition, the soil and the improvement material 9
Is sufficiently crushed, shredded, stirred, and uniformly mixed and dispersed so that the accuracy does not vary. Also, in the ascending process, as shown in FIG. 8, the casings 20, 20 of the underground mixer 200, 200 'are In the ascending locus, the soil mixed and stirred and the improved soil of the improving material move to the side as shown by the white arrow in FIG. (Through the slit 21 of the casing 20 'of the mixer 200'), a mixing and mixing phenomenon, an uptake, and a diffusion action are performed, and the dispersed state of all three improved soils is made uniform, and solidification progresses with time.

In this case, providing the openings on the side surfaces of the casings 20 and 20 'facilitates the lateral movement of the modification work 9.

And the mixers 200, 200 'all over the place
When reaches the upper stroke end of the drilled hole 6, the carriage 2 moves laterally by one step, adjoins the soil cement column material formed in the previous step, and as shown in FIG. The position is set at the position where the ridge is formed, and the above construction process is repeated.
The underground pile 13 or the underground structure 13 'shown in 3 is formed.

Incidentally, as shown in FIG. 1, in the central underground mixer 200 ', the rotation of the outward stirring blades 24 causes the drum casing 20 of the underground mixer 200 on both sides and the slit 2 thereof.
It is sized so that it does not interfere with one part.

Further, three multi-stage stirring blades 23, 24, 2
It is within the scope of design change that the levels of 7, 27 'are the same or different.

In the embodiment shown in FIG. 10, the three drum casings 20 ', 20', 20 'are integrally connected and fixed to prevent rotation, and inward fixed stirring blades 23, 23 are provided inside. Fixed to the outer shaft 18 (therefore, the outer shaft 18
Is an edge of the output shaft of the motor 28 and does not rotate. Only the inner shaft 19 is provided with a freely rotatable outward stirring blade 24, and a kind of extrusion type soil cement material has three laterally overlapping portions. This is a mode in which the columnar continuous underground wall 13 can be constructed substantially in FIG.

In this embodiment, the three drilled holes 6, 6 and 6 are free from rough skin and collapse of the holes, the intrusion of groundwater can be prevented, and the overlapping portion 12 can be formed more reliably. The workability is good and the underground structure can be surely made highly reliable in a short period of time.

Of course, the embodiment of the invention of this application is not limited to the above-mentioned embodiments. For example, in the case where the casing is a rotary type underground mixer, the phase difference between the upper and lower sides of the mixer is also vertical. And adopt various modes such as providing a multi-stage outward stirring blade without interfering with each other and engaging the stirring blade with the casing via a hook so that the stirring blade integrally rotates in the rotation direction. It is possible.

It is also possible to provide the improving material injection nozzle on the agitating blades by changing the design.

It goes without saying that not only cement milk but also powder and the like can be used as the improving material.

[0037]

As described above, basically, according to the invention of this application, a foundation pile or an underground pile such as a pillar row continuous underground wall is drilled in the ground and an improved material such as cement milk is fed. Feeding, mixing and stirring, solidifying and solidifying over time to form an underground structure, and when performing soft ground improvement, etc., underground such as soil cement that has an overlapped portion laterally by 3, 5 etc. by design The piles can be constructed all at once, and the drilled part that cannot be seen from the ground has an overlapping part and can be formed in series, so the strength and rigidity of the underground structure, etc. The excellent effect that the reliability of the construction is improved.

Further, since a plurality of pieces can be cyclically constructed, the construction efficiency is good, the construction period can be shortened, the cost can be reduced, and the construction safety can be maintained. .

In addition, since an overlapping portion can be reliably formed by using a plurality of underground agitators in combination, and further, mixing and stirring and dispersion can be performed reliably, the use of improved materials such as cement milk is excessive. There is an advantage that the amount can be reduced and the cost can be suppressed by using a predetermined amount.

In particular, by using the stirring blades which rotate in the reverse direction in the casing of the underground mixer, the crushing or breaking of the soil in the drilling hole at the time of pushing is promoted, and the improvement material to be injected in the pulling process is improved. Since the dispersion by mixing and stirring can be made as uniform as possible, the excellent effect that the structure having sufficient strength can be formed in the ground while using the minimum amount of the improving material .

Then, the turning radii of the stirring blades are made to overlap each other in the rotating regions of the underground mixer casing on both sides, so that the formation of the lateral overlapping portion of the soil cement material is surely made in the pulling process. Moreover, there is an advantage that a structure such as an underground pile can be constructed as designed by performing it over the entire length.

Further, there is also an effect that the device can be easily constructed by integrating three casings, the strength and durability can be improved, and the construction can be easily carried out.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a single underground mixer according to an embodiment of the present invention.

FIG. 2 is a schematic schematic side view of the same.

FIG. 3 is a rear side view of the rotary power transmission mechanism of the same.

4 is a cross-sectional view taken along the line IIII-IIII of FIG.

5 is a sectional view taken along line VV of FIG.

FIG. 6 is a partial cutaway perspective view of the underground mixer on both sides.

FIG. 7 is a schematic perspective view of the central underground mixer of the same.

FIG. 8 is a schematic cross-sectional view of three underground mixers.

FIG. 9 is a partial sectional front view of the main part of the apparatus.

FIG. 10 is a sectional view of another embodiment.

FIG. 11 is a partial cross-sectional side view of the underground structure forming construction of the general mode.

FIG. 12 is a schematic partial perspective view of a continuous underground pillar wall of a general mode.

FIG. 13 is a schematic plan view of the group underground structure.

[Explanation of symbols]

 9 Improvement material 19 'Feed passage 19 Inner shaft 18 Outer shaft 16 Rotating shaft 20 Drum casing 23 Inward stirring blade 24 Outward stirring blade 200,200' Underground mixer 14 Underground stirring device for civil engineering work 27, 27 Other stirring blade 20 '' Casing of circular cross section 30-42 Mutual reversing gear device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (71) Applicant 000149206 Osaka Waterproof Construction Co., Ltd. 7-6, Eizashi-cho, Tennoji-ku, Osaka-shi, Osaka (71) Applicant 000140292 Okumura-gumi Co., Ltd. 2, Matsuzaki-cho, Abeno-ku, Osaka-shi, Osaka 2-2 (71) Applicant 000205328 Osaka Cement Co., Ltd. 1-4-4 Dojimahama, Kita-ku, Osaka-shi, Osaka (71) Applicant 000146928 Morimoto Gumi Co., Ltd. 4-11 Yuhigaoka-cho, Tennoji-ku, Osaka-shi, Osaka ( 71) Applicant 000140694 Kato Construction Co., Ltd. Kanie-cho, Kaifu-gun, Aichi Large area, Kanie, Shindenji, 19-1 (71) Applicant 000148346 Zenkougumi Co., Ltd. 2-2-1 Nishihonmachi, Nishi-ku, Osaka-shi, Osaka (71) ) Applicant 390036515 Konoikegumi Co., Ltd. Konohana-ku, Osaka-shi, Osaka 4-3-55 (71) Applicant 390036504 Tokyo Metropolitan Government 8-14-14, Ginza, Chuo-ku (71) Applicant 000004123 Nippon Steel Tube Co., Ltd. 1-2-1, Marunouchi, Chiyoda-ku, Tokyo (72) Masakazu Masuda 2--22, Matsuzaki-cho, Abeno-ku, Osaka Inside the Okumura group (72) Inventor Tsuneo Wakita 2-2-2 Matsuzaki-cho, Abeno-ku, Osaka City Inside the Okumura group

Claims (5)

[Claims] 1. An inward stirring blade engaged with a drum casing fixed to the outer shaft of a double shaft consisting of an inner shaft having an improvement material feed passage and an outer shaft loosely mounted on the inner shaft. In an underground mixing device for civil engineering construction, which has an underground mixer in which outward stirring blades fixed to the inner shaft are alternately arranged in multiple stages in the axial direction, the outer shaft and the inner shaft are mutually reversing gears. An underground stirring device for civil engineering construction, which is linked to the device. 2. An inward stirring blade fixed to a drum casing fixed to the outer shaft of a double shaft consisting of an inner shaft having an improvement material feed passage and an outer shaft loosely mounted on the inner shaft. In an underground stirring device for civil engineering construction, which has an underground mixer in which outward stirring blades fixed to the inner shaft are alternately arranged in multiple stages, another inner shaft equipped with the underground mixer on both sides An underground stirring device for civil engineering construction, characterized in that a rotary stirring blade is fixed to the inner shaft, an outer shaft is loosely mounted on the other inner shaft, and a casing having an arc cross section is fixed to the outer shaft. 3. The land for civil engineering construction according to claim 2, wherein the end edges of the casing having the arc cross section are arranged in close proximity between the drum casings of the underground mixers on both sides. Medium stirring device. 4. An inward stirring blade fixed to a drum casing fixed to the outer shaft of a double shaft consisting of an inner shaft having an improvement material feed passage and an outer shaft loosely mounted on the inner shaft. In an underground mixing device for civil engineering construction, which has an underground mixer in which outward stirring blades fixed to an inner shaft are alternately arranged in a plurality of stages in an axial direction, the drum casings are mutually fixed with an arc cross section. Underground agitation device for civil engineering construction, characterized in that it is of a triple-type construction. 5. The underground stirring device for civil engineering work according to claim 4, wherein the inner shaft is linked to a rotary drive device.