JP3089346B2 - Equipment for improving soft ground - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved apparatus used for rotary excavation of soft ground, and for injecting an improved material such as cement milk into the excavated soil, mixing well, and improving the strength of the excavated soil. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved apparatus capable of performing a rotary excavation in a bent state in which a structure or the like exists in a place where only a narrow construction space can be secured and the structure is sunk into an underground portion corresponding to a lower part of the structure.

[0002]

2. Description of the Related Art Conventionally, a ground improvement machine for rotating and digging a soft ground in a middle-bent state and a soft ground improvement method using the same have been described in, for example, JP-A-63-134711 and JP-A-6-1984.
It is described in JP-A-3-134712 and belongs to the public.

[0003]

[Problems to be Solved by the Invention] In the above-mentioned known soft ground improvement machine of the center-bending type, the front-side element and the base-side element that generate local vibration (reciprocating rotation) can be bent (rotated and bent). Are connected by pins. Then, the pin is directly rotated by two hydraulic cylinders installed in the hollow portion of the base side element to perform a center-folding operation. However, it is impossible to incorporate the above-described folding mechanism in the hollow portion of the thin base-side element having an outer diameter of only about 50 mm. In addition, there is no reason for the force transmission mechanism, which is not preferable in terms of manufacturing and maintenance, and from the viewpoint of long service life.
There is a strong demand for improvement. The local vibration of the tip side element is a means for fluidizing the ground when the ground improvement machine penetrates into the soft ground, reducing the penetration resistance, and efficiently performing vibration-free and noise-free penetration. However, the local vibration generating mechanism of the conventional ground improvement machine is such that a hydraulic motor is installed above the distal element, the rotation of the hydraulic motor is transmitted to the housing of the distal element, and the entire housing is reciprocated within 360 ° within a range of 360 °. It is a configuration that rotates. In addition, the rotation reaction force is a structure in which a reaction force is applied to the base side element via the pin from the hydraulic motor itself and the ring bracket to which the hydraulic motor is fixed, and there is great structural difficulty in taking the rotation reaction force. In addition, even if the cement milk or the like spouted through the tip side element is supplied by a flexible hose capable of allowing the reciprocating rotation within the above-mentioned 360 °, it cannot be denied that the material is unreasonable. There is a problem with the service life of In addition, cement milk and the like have a problem that their efficacy is low because they are only simple continuous jets.

[0004]

As a means for solving the problems in the conventional technology. SUMMARY OF THE INVENTION The improved apparatus of soft ground according to the invention described in claim 1 is moved up and down along a leader of heavy equipment, and attached to the tip of the rod to be rotated in use, Ru is penetrated into the soft ground in utilizing local oscillation
And an intermediate part between the base element and the distal element
Is possible to increase the rotating drilling the ground as the seat back tilting state the place
In the improvement equipment to improve and strengthen the soft ground by injecting and stirring the improving material such as cement milk into the excavated soil,
The upper end of the housing of the distal element for generating a local oscillation is middle broken linked by a lower end portion and the pin of the housing of the proximal element, connected by the pin on the upper end portion of the housing of the distal-side element the arm portion formed eccentrically from the position, the output shaft of the actuator installed in the downward of the axial housing of the base-side element is connected via a connecting rod, the destination
A straight line in the housing of the end element in a direction parallel to its axis
Piston type member that reciprocates with a constant stroke only
Are installed concentrically, and the outer peripheral surface of the piston type member is
Male screws with helical directions opposite to the upper and lower ends
Are formed as reverse screws, and the upper and lower male screws are
Upper and lower two cylindrical shapes formed with internal threads to be screwed
The rotating member that forms the female screw with the male screw and the screw
It is installed so that it can be rotated only by joining, and the outer peripheral surface of each rotating member
Is provided with stirring blades,
Improvement such as cement milk provided in the axial direction of the ring
A plurality of materials are arranged in a radial arrangement in a horizontal direction
And a plurality of improved material ejection holes are provided in the circumferential direction of the rotating member.
The jet nozzle is communicated with the rotating member as it rotates.
Or are configured to be cut off .

[0005]

[0006]

[Action] drives the actuator 8 is advanced its output shaft 8a, the movement Ri rotational force and wrinkle transfer in <br/> the arm 7 which is offset from the position of the pin 6 through the connecting rod 9, the tip The side element 2 is rotated from 0 ° (vertical state in FIG. 1) around the pin 6 to a maximum of 90 ° (see the dotted line in FIG. 2), and is in a bent state. When the rotary drive is performed in the state of being bent, a large rotary excavation having a diameter D (FIG. 2) can be performed.
Of course, when the actuator 8 is driven in the reverse direction, the distal element 2 is restored to the original vertical straight state.

When the piston-type member 14 of the distal-end-side element 2 is linearly reciprocated, the piston-type member 14 can only rotate freely into external threads 15 and 16 formed as reverse threads on the outer periphery of the piston-type member 14 (that is, the piston-type member 14). 14 does not move in the moving direction of the piston type member 14), the two rotating members 19 , 20 screwed in the moving direction of the piston type member 14 cannot move in the moving direction of the piston type member 14, and the piston type member 14 moves only linearly. Therefore, the two rotary members 1 are used as the screw motions of the male screws 15 and 16 and the female screws 17 and 18.
The reference numerals 9 and 20 are rotated in opposite directions, and each counteracts the reaction force of the rotation. The rotation of the rotating members 19 and 20 is performed as local vibration reciprocating at a certain rotation angle or rotation number.
With the reciprocating rotation of the rotary members 19 and 20, the stirring blades 21 on the outer peripheral surface of the rotary member excavate the surrounding ground and spout the improving material (or muddy water) as needed, thereby weakening the improving device. Resistance to penetrate into the ground is greatly reduced. The improved device comprises a distal element 2 and a proximal element 4
Is penetrated into the soft ground in a straight line in a straight line, so that improvement work can be performed if a construction space corresponding to the outer diameter of the improvement device is secured.

During the rotation of the rotating members 19 and 20, the improving material such as cement milk is ejected in a pulsed manner only in a range where the ejection nozzle 24 communicates with the improving material ejection hole 23 on the housing 3 side. The nature is high.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
FIG. 1 shows a view of an improved device when it is attached to the tip of a rod 1 that is moved up and down and rotated along a leader of a heavy equipment on the ground (not shown) and penetrates into a target soft ground. ing. The distal-side element 2 and the base-side element 4 are in a straight line in a straight line, and the upper and lower rotating members 19 and 20 constituting the distal-side element 2 and the stirring blades 21 and 32 projecting from the respective outer peripheral surfaces are mutually connected. Opposite directions (arrow B,
C) , the reciprocating rotation (local vibration) is performed, and the surrounding ground is rotationally excavated to reduce the penetration resistance. Further, the improving material is ejected in a pulsed manner from the ejection nozzles 24 provided on the rotating members 19 and 20 of the distal end side element 2, so that the excavated soil is in a flowing state, thereby reducing the penetration resistance.

FIG. 2 et seq. Show details of the structure of the improved apparatus. As shown in FIG. 2, the housing 5 of the base side element 4 is a stainless steel tube having an outer diameter of about 80 mm and a length of about 700 mm, and a hydraulic cylinder 8 is mounted on an upper end thereof as a bending drive unit (actuator). Have been. The output shaft 8a of the hydraulic cylinder 8 is mounted downward in the axial direction of the housing 5 of the base side element. Code 8
b is a hydraulic piston integrated with the output shaft 8a. The hydraulic pressure is guided to the chambers 8c and 8d before and after the hydraulic piston 8b, and the output shaft 8a reciprocates linearly with the hydraulic piston 8b.

An upper end of the housing 3 of the distal element 2;
The lower end of the housing 5 of the base side element 4 is connected to the lower end of the housing 5 by a pin 6 so as to be able to bend and rotate (bend). An arm 7 is formed at the upper end of the housing 3 of the distal element 2 eccentrically from the connection position by the pin 6, and the upper end of the arm 7 and the output shaft 8 a of the hydraulic cylinder 8 are formed.
Are connected to each other via a connecting rod 9. Accordingly, when the hydraulic cylinder 8 is driven to advance the output shaft 8a downward, this movement is transmitted as a rotational force to the arm 7 of the distal element 2 via the connecting rod 9, and the distal element 2 is , And is folded in the middle as shown in FIG. The bending angle θ of the tip-side element 2 can be adjusted from 0 ° (straight state) to a maximum of 90 ° depending on the size of the forward stroke of the output shaft 8a. Tip side element 2
, The diameter D of the rotary excavation is obtained as D = 2L sin θ based on the relationship with the above-mentioned bending angle θ. The size of the forward stroke of the output shaft 8a, and thus the size of the diameter D of the rotary excavation obtained as described above, is determined by determining the height position of the indicator rod 8e that is raised upward in the opposite direction to the output shaft 8a. It is configured so that it can be visually confirmed through twelve observation windows 12a. However, the present invention can be implemented by a configuration in which the displacement of the indicating rod 8e or the displacement of the output shaft 8a is directly measured by a displacement sensor, recorded, and displayed. Reference numeral 13 in FIG. 2 denotes a slide bearing (guide) for the output shaft 8a installed in the housing 5.
It is.

The details of the structure of the distal end element 2 are shown in FIGS. 3 and 4, and the housing 3 is made of stainless steel or the like.
One improvement material injection path 1 through which improvement material such as cement milk or water for drilling (water jet) passes
0 and two hydraulic passages 11 and 11 'for driving a piston-type member 14 described later are provided in the axial direction (FIG. 4).
A). A piston type member 14 is installed at a substantially intermediate portion in the axial direction of the housing 3 so as to be able to reciprocate with a constant stroke (about 20 mm) only linearly in a direction parallel to the axis of the housing 3. I have. The piston member 14 has a cylindrical shape, is slidably fitted into a small-diameter portion of the housing 3, and can move only linearly along a slide key 22 fixed in the axial direction on the outer peripheral surface of the housing 3 and rotates. It is installed in a state where it does not. Male screws 15 and 16 whose helical directions are opposite to each other are formed as reverse screws at portions near both ends of the outer peripheral surface of the piston-type member 14, respectively. On the other hand, female screws 17 and 18 which are formed in a cylindrical shape having an outer diameter substantially the same diameter as the large diameter portion of the housing 3 and which can be screwed to the respective male screws 15 or 16 with the same specifications are formed on the inner peripheral surface. Rotating members 19 and 20 are mounted so as to be rotatable only by screwing respective female screws 17 and 18 to male screws 15 and 16 of the piston type member 14. That is, the upper end surface of the upper rotating member 19 is configured to rotate by abutting on the step 25 having a different diameter of the housing 3. The lower end portion of the upper rotating member 19 and the upper end portion of the lower rotating member 20 are rotatably butted against each other by a ring structure 40. The lower end of the lower rotating member 20 is rotatably abutted via a thrust bearing 28 between an inverted conical nut member 27 screwed and fixed to the lower end of the housing 3 with a screw 26.
27 'is a lock nut. The nut member 27, the lock nut 27 ′, and the thrust bearing 28 are fitted on the outer periphery of the lower part of the lower rotating member 20 and set screws 30.
And is completely covered and protected in a watertight state by an inverted cone-shaped cover member 31 fixed by the above. On the outer peripheral surface of the cover member 31 rotated together with the lower rotating member 20,
A plurality of agitating blades 32 for excavation are provided. A plurality of ridged stirring blades 21 are also provided on the outer peripheral surfaces of the upper and lower rotating members 19 and 20.

With the above structure, the outer peripheral surface of the housing 3 and the rotating member 1
A closed chamber surrounded by the inner peripheral surfaces of 9 and 20 is formed as a piston front chamber 33 and a piston rear chamber 34. One hydraulic conduit 11 ′ is connected to the piston front chamber 33, and another hydraulic conduit 11 is connected to the piston rear chamber 34. Therefore, when pressure oil is supplied to the piston front chamber 33, the piston-type member 14 moves downward, and when pressure oil is supplied to the piston rear chamber 34, the piston-type member 14 moves upward.
In accordance with the linear reciprocating motion of the piston type member 14, the upper and lower two rotating members 19, 20 reciprocate in the opposite directions by the screw motion of the male screws 15, 16 formed as reverse screws and the female screws 17, 18 (locally). Vibration) and cancel each other's reaction forces during rotation. By the rotation of the two rotating members 19 and 20, the stirring blades 21 and 32 provided on the respective outer peripheral surfaces rotate and excavate the surrounding ground to reduce the penetration resistance and facilitate the penetration operation.

Next, as shown in FIG. 3A, first, as shown in FIG. 3A, the improving material injection path 11 is provided at a position near the upper end of the upper rotating member 19. Material ejecting hole 23 communicated with, for example, a right angle 4
Four housings 3 are provided substantially horizontally in radial directions. At the corresponding position of the upper rotating member 19, four ejection nozzles 24 are provided at positions obtained by dividing the circumference thereof into four equal parts.
Are provided so as to be able to communicate with the improving material ejection holes 23 (see FIG. 4A). That is, only when the ejection nozzle 24 communicates with the improvement material ejection hole 23, the improvement material such as cement milk or the water jet for excavation is ejected within the communication range, and when the communication is not established, the improvement member is ejected by the rotating member 19. The outlet of the hole 23 is hermetically sealed, so that the improving material or the like is ejected in an intermittent pulse shape.

At the lower end of the same improver injection path 10,
At a position slightly above the upper ring portion of the cover member 31 attached to the lower rotating member 20, an improving material ejection hole 23 communicating with the improving material injection path 11 is also arranged radially in four orthogonal directions. Four are provided substantially horizontally. Also, at the corresponding position of the lower rotating member 20, four ejection nozzles 24 are provided at positions obtained by dividing the circumference thereof into four equal parts, and the improved material ejection holes 23 are provided.
It is provided in series so as to communicate with (FIG. 3B). Therefore, an improving material such as cement milk (or a water jet for excavation) is ejected in a pulsed manner only in a range where the ejection nozzle 24 communicates with the improving material ejection hole 23, and when the communication is not performed, the improving material is rotated by the rotating member 20. The outlet of the ejection hole 23 is sealed.

The upper ends of the improving material injection passage 10 and the hydraulic conduit 11 provided in the housing 3 of the above-mentioned distal element 2 are not shown, but are flexible piped through the base element 4. Flexible hose or flexible hydraulic pipe, etc., and a cement milk pump or hydraulic unit on the ground. Piston type member 1
The reciprocating drive 4 is not limited to the above-described hydraulic drive, but can be performed by power of an electromagnetic solenoid or the like. In some cases, the power circuit is provided instead of the hydraulic conduit 11.

When the soft ground is excavated while the tip-side element 2 is bent, the upper and lower rotating members 1 are simultaneously excavated.
By reciprocating rotation of 9, 20 (local vibration) and ejecting the improving material to mix and mix well with the excavated soil, the purpose of improving and strengthening the soft ground is efficiently achieved with high quality.

[0018]

[Effects of the present invention] The apparatus for improving soft ground according to the present invention has a structure in which a center bending drive mechanism can be easily incorporated.
In addition, since the transmission mechanism of the bending force can be easily transmitted, manufacture and maintenance are easy, and a long service life is maintained and reliability is high. A mechanism for generating reciprocating rotation (local vibration) in the tip-side element 2 includes two rotating members 19 and 20.
Because of the configuration that cancels the rotational reaction force, there is no unreasonable load of force, the structural stability and reliability are high, and the service life is excellent. Moreover, since the configuration is such that the spouting of the improving material or the like can be performed in a pulsed manner using local vibration, the improvement and strengthening of the ground are highly effective and economical.

[Brief description of the drawings]

FIG. 1 is an elevational view showing a posture of the improvement device at the time of penetration.

FIG. 2 is an elevational view showing a folding mechanism of the improved device.

FIGS. 3A and 3B are cross-sectional views showing a tip-side element vertically divided by a line BB.

4A and 4B are cross-sectional views taken along lines aa and bb of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rod 2 Tip side element 3 Housing 4 Base side element 5 Housing 6 Pin 7 Arm part 8 Actuator 8a Output shaft 9 Connecting rod 10 Improvement material injection path 11 Hydraulic guideway 14 Piston type member 15,16 Male screw 17,18 Female screw 19, Reference Signs List 20 rotating member 21 stirring blade 23 improving material ejection hole 24 ejection nozzle

Continued on the front page (72) Inventor Yoshio Suzuki 2-5-1-14 Minamisuna, Koto-ku, Tokyo Inside Takenaka Corporation Technical Research Institute (72) Inventor Akihiko Uchida 2-5-14-Minamisuna, Koto-ku, Tokyo Stock Company Takenaka Corporation Technical Research Institute (72) Inventor Yasushi Kanzaki 8-21-1, Ginza, Chuo-ku, Tokyo Co., Ltd.Takenaka Civil Engineering Co., Ltd. (72) Inventor Shuji Sakaguchi 8-2-1 Ginza, Chuo-ku, Tokyo Takenaka Co., Ltd. Civil engineering (72) Inventor Yasuo Aoki 8-9-20 Shimorenjaku, Mitaka-shi, Tokyo Sam Electronics Co., Ltd. (56) References JP-A-63-134711 (JP, A) JP-A-60-55105 ( JP, A) JP-A-61-113922 (JP, A) JP-A-53-71907 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E02D 3/12

Claims (1)

(57) [Claims] 1. A is vertically movable along the heavy equipment leader, and is attached to the tip of the rod to be rotated in use, a shall be penetrated into soft ground in utilizing local vibration, deer
Also a state folded middle intermediate portion between the proximal element and the distal end side element
The ground can be rotated and excavated greatly, and an improving material such as cement milk is injected into the excavated soil and agitated to improve and strengthen the soft ground. upper part is the seat back tilting is linked by a lower end portion and the pin of the housing of the proximal element, an arm portion formed eccentrically from the connecting position by the pin on the upper end portion of the housing of the distal-side element, that the output shaft of the actuator installed in the downward of the axial housing of the base-side element is connected via a connecting rod, the housing of the distal-side element, parallel to the axis orientation
Piston reciprocating with a constant stroke only linearly
A mold member is installed in a concentric arrangement and is outside the piston mold member.
The direction of the spiral is opposite to the upper and lower ends of the peripheral surface.
A male screw is formed as a reverse screw, and the upper and lower male
Two upper and lower circles formed with a female screw to be screwed to the screw
A rotating member having a cylindrical shape is used to connect each female screw to each male screw.
Is installed by screw connection with only rotation.
The stirring blades are provided on the outer peripheral surface, and the cement provided in the axial direction of the housing of the tip side element.
Injection path for improving material such as toe milk and a series of horizontal emissions
And a plurality of improving material ejection holes provided in a circular arrangement, and the rotating member
A plurality of ejection nozzles provided in the circumferential direction of the
Are configured to be connected or interrupted as the
Rukoto, characterized by respectively modifying apparatus of soft ground.