JP2000352070A - Multi-spindle underground continuous wall construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set a ratio of a machine cross section to a construction cross section to be small, reduce machine inserting and dragging resistance even in high viscosity soil mud, and improve executability. SOLUTION: Plural excavating spindles 13 are supported in parallel on a multi-spindle excavator body 6 supported by a leader mast 2 or the like to be freely elevatable, and prime mover parts 14 of multi-spindle drive parts to drive the respective excavating spindles to rotate are disposed having height difference in a height direction thereof, thereby a ratio of a construction machine cross section to a construction cross section is set small.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiaxial underground continuous wall construction machine for constructing a continuous wall by forming a column of soil cement in the ground.

[0002]

2. Description of the Related Art Conventionally, construction for constructing a continuous wall by forming a column of soil cement in the ground for earth retaining or the like has been performed.

A construction machine used for constructing the above-described soil cement underground continuous wall generally employs a form in which a plurality of excavating shafts are mounted on an earth auger that moves up and down along a leader mast of a base machine. Have been.

Recently, in order to reduce the size and the center of gravity of a machine, a construction apparatus as disclosed in, for example, JP-A-7-113233 or JP-A-10-219734 has been proposed.

In any of the above publications, a multi-axis excavator is hung below a leader mast, and a plurality of excavators are supported in parallel by this excavator and driven to rotate. ing.

[0006]

In the prior art described in the above-mentioned publication, it is possible to reduce the size and the center of gravity of the machine. Parts (electric or hydraulic motors) are arranged side by side in the multi-shaft excavator, so that the ratio of the cross-sectional area of the multi-shaft excavator going into the ground to the construction cross-sectional area becomes large, and therefore high viscosity In such soil mud, there is a problem that the penetration and pull-out resistance of the multi-shaft excavator is large, causing a remarkable decrease in the construction speed and increasing the construction cost.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has been made to solve the above problems. The object is to improve the construction efficiency by reducing the penetration / pull-out resistance even in soil mud.

[0008]

As a means for solving the above-mentioned problems, the present invention provides a multi-axis excavator body which is supported on a leader mast and the like so as to be able to move up and down, and supports a plurality of excavation axes in parallel. The motor unit of the multi-shaft drive unit that rotationally drives the multi-shaft excavator body is arranged with a height difference in the height direction, and the ratio of the construction machine cross-sectional area to the construction cross-sectional area is reduced. It is characterized by. The excavation shaft in this case does not matter whether or not there is a screw blade.

In the above, the excavation shaft driven by the prime mover disposed above the multi-shaft excavator body is a vertical screw conveyor, and the soil mud under the construction machine is stirred and transported upward. Alternatively, it is preferable that the excavation shaft be constituted by a screw conveyor in which screw blades are intermittently arranged or a stirring rod in which stirring blades are arranged, in a preferable form for improving circulation and stirring of soil mud. is there.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments shown in the drawings.

FIGS. 1A and 1B show a front view and a side view of an external view of an embodiment of a multi-axial underground continuous wall construction machine according to the present invention, and show a crawler type self-propelled base machine. 1
The leader mast 2 is provided with a support 3 at the front of the base machine 1.
And a stay 4, which are vertically erected, and a guide 8 provided on upper and lower portions of a guide rail 5 on the front side of the leader mast 2 for guiding the lifting and lowering of the multi-axis excavator body 6. , 9 are engaged so as to be able to move up and down. The kelly bar 7 is wound up by a winch (not shown) on the base machine 1 via a wire rope 11 passing through a top sheave 10 at the upper end of the leader mast 2. It can be lowered freely. The multi-axis excavator body 6
Is not limited to the support by the keriba 7 but may be other means.

The multiaxial excavator body 6 is supported at the lower end of the kelly bar 7. As can be seen from FIGS. 1A, 1B and 2, the casing 12 of the multi-axis excavator body 6 has a knitted flat vertically long rectangular shape thinner than the kelly bar 7 in a side view. Upper half 1 in front view
As 2a reaches the upper end, it has a hem-spread shape having a width equal to or smaller than the width of the kelly bar 7, and the lower half portion 12b is formed of a vertical wall surface and has a generally vertically trapezoidal shape in front view as a whole. No.

[0013] In the embodiment shown in FIGS. 1 and 2 is a case of providing four excavating shaft _{13 1,} 13 _2, 13 3, 13 _4, two drilling shaft ₁₃ located at the center side 2, 13 ₃ the prime mover unit ₁₄ 2, 14 ₃ (submersible motor used in this embodiment) are arranged inside upper position of the half 12a on the casing 12, the drilling shaft ₁₃ 1 of the both outer sides, 13 ₄ of the engine unit 14 ₁ , 14 ₄ two drilling shaft ₁₃ 2 of the center side in the lower half 12b of the casing 12, 1
3 ₃ is arranged at a position close to the outer portion.

The motor units 14 ₂ and 14 ₃ located above the casing 12 are partitioned by a partition 15.
Prime mover unit ₁₄ 1, 14 ₄ drilling shaft ₁₃ 2, 13 ₃ are partitioned by partition walls 16 to, these partition walls 15 and 16 between the casing 12 side is being opened opening 17 similarly positioned below, 17 is set.

[0015] Each of the prime mover ₁₄ 1-14 ₄ is constituted by a submersible motor 18 and speed reducer 19, the speed reducer 1
Swivel device 20 ₁ to 20 ₄ which is liquid supply rotary joint for supplying during drilling ground a chemical mortar through the drilling in the shaft at the bottom of 9 are respectively provided, through which swivel device 20 ₁ to 20 ₄ Each excavation axis 13 ₁ -13
₄ are connected.

Each excavating shaft 13₁~ 13₄At the bottom of
Auger head 21₁, 21₂, 21 ₃, 21₄Equipped
The position directly above these auger heads is
₁~ 13₄Connecting bearings 2 to prevent
2 bound.

[0017] is with the excavating shaft _131-134 two long excavating shaft ₁₃ 2 located in the center side of the _four, 13 ₃ and the vertical screw conveyor screw vane ₂₃ 2, 23 ₃ is reversely wound with each other, both sides short excavating shaft 13 located _1, 13 between neighboring adjacent thereto in ₄ excavating shaft 1
3 _2, 13 ₃ of the screw blades ₂₃ 2, 23 ₃ screw blade ₂₃ 1 in the reverse winding and, 23 ₄ are provided intermittently.

Further, the excavating shafts 13 ₂ ,
13 ₃ of the lower end of the auger head ₂₁ 2, 21 ₃ are drilled range has a step up and down so as to partially wrap and having a reverse screw blades ₂₄ 2, 24 ₃ with each other, located on either side excavating shaft ₁₃ 1, 13 ₄ of the lower end of the auger head ₂₁ 1, 21 ₄ are respectively reverse winding and drilling shaft ₁₃ 2, 13 ₃ of the auger head ₂₁ 1, 21 ₄ of the screw blades ₂₄ 2, 24 ₄ adjacent thereto to the screw blade 24 _1, 24 ₄ auger head 21 _2, 21 ₃ that adjoin with a drilling range of the auger head adjacent have a step up or down is adapted to partially wrap. 3 (A) to 3 (D) show FIG.
AA, BB, CC, and DD of FIG.

Reference numeral 25 in FIG. 1, the swivel device ₂₀ 1, 20 ₄ ducts housing the hoses and power cables for supplying a chemical liquid through, 26 and 27 show the reel, FIG. 6 (B), the In (C), 28 indicates the outer diameter of the auger head for excavation and stirring.

Next, the operation of the above embodiment will be described.

In order to form a continuous wall in the ground, the base machine 1 is moved to the site where the continuous wall is formed, and each of the excavating shafts 13 _{1 to} 13 _1
4 is set as the continuous wall forming direction.

[0022] Then with unwinding the wire rope 11 while rotating the respective drilling axes _131-134 by driving the prime mover unit ₁₄ 1 to 14 _4, the duct 25, swivel device 20
20 ₁ to 20 ₄ mortar, such as cement milk chemical liquid (or air) by selectively while discharging the excavated soil gradually lowers the multi-axis drilling machine body 6 from the tip of the auger head 21 ₁ to 21 ₄ through drilling Perform

[0023] The drilling axis _131-134 as the excavation progresses
And lower soil mud auger head 21 ₁ to 21 multi-axis drilling machine body 6 by each of the screw blade ₄ is conveyed while being stirred upwards. This reduces penetration resistance during excavation and does not affect construction speed.

When a predetermined depth is reached, each excavation axis 13
_{1-13 4} while rotating in opposite direction the wire rope 1
1 is wound up and the drawing process is started. In this drawing step, the soil mud in the upper part is conveyed downward while being stirred, whereby the drawing resistance is reduced and the construction speed is not affected.

[0025] Since circulating vertically Thus excavating shaft _131-134 penetration time and withdrawal time with soil mud being stirred, Doroneri the sediment satisfactorily performed, construct a good continuous wall quality can do.

When one excavation operation is completed as described above, the base machine 1 is moved by a predetermined distance, and the next excavation is performed in the same manner as described above so that a part of the excavated part is wrapped. Then, the above steps are sequentially repeated to form an underground continuous wall.

FIG. 4 shows another embodiment of the present invention.
(A) shows a case where three excavation axes are used, and (B) shows a case where five excavation axes are used.

[0028] For three of FIG. 4 (A), halves 12a located in central over one drilling axis 13 ₅ of the prime mover 14 ₅ casing 12 of the multi-axis drilling machine body 6 located at the center , the prime mover unit ₁₄ 6, 14 ₇ of the left and right excavating shaft ₁₃ 6, 13 ₇ are arranged in proximity to the drilling axis 13 ₆ of the center in the left and right positions of the lower half 12b of the casing 12. Since the other configuration is the same as that of FIG. 2, the corresponding parts are given the same reference numerals.

FIG. 4 is the case of the five (B), 3 pieces of excavating shaft ₁₃ 8 located closer to the _center, 13 9, ₁₃ prime mover ₁₄ 8 _10, 14 9, ₁₄ of the ₁₀ casing 12 of the upper half Part 1
2a, they are arranged adjacent to each other and adjacent to the excavating shafts 13 ₈ , 13 ₁₀ on both sides. Since the other configuration is the same as that of FIG. 2, the corresponding parts are given the same reference numerals.

FIGS. 5 and 6 show four excavating shafts 13 ₁₃ , 13
₁₄ , 13 ₁₅ , and 13 ₁₆ show an embodiment in a case where they are arranged in a rectangular shape in a horizontal cross section.

In this embodiment, it is located at the opposite corner position.
Two drilling shafts 13₁₃, 13₁₄Motor that drives the rotation
Part 14₁₃, 14₁₄Is located above the multi-axis excavator body 6
Two excavating shafts 1 disposed at the other opposite corner position
3_Fifteen, 13₁₆Engine unit 14_{1 5}, 14₁₆Is multi-axis
It is located below the excavator body 6 and
As shown in FIGS. 6 (B) and 6 (C),
₁₃~ 14₁₆Are each drilling shaft 13 ₁₃~ 13₁₆Skull of
Partly wraps around the wings.

Accordingly, the casing 12 of the multi-spindle excavator body 6 also has a shape in which the upper half portion 12a is thick enough to incorporate the upper prime mover portions 14 ₁₃ and 14 ₁₄ in a side view, and only the lower half portion 12b is lower. Motor unit 14 ₁₅ , 14
₁₆ and other excavating shafts 13 ₁₃ , 13 ₁₄ can be inserted. The other configuration is the same as that of FIG. 2 and the corresponding parts are given the same reference numerals.

Also in this embodiment, four excavating shafts 1
3 _{13-13 16} ratio of the cross-sectional area of the multi-axis drilling machine body 6 to the outer virtual range is small. As described above, the present invention can be implemented even in a case where the excavation axes are not arranged in a single horizontal row, and the intended purpose can be achieved.

In any of the embodiments, the prime mover for rotating each excavating shaft is disposed with a height difference in the height direction of the multi-shaft excavator main body 6, so that the construction machine has an The ratio of the cross-sectional area is small, so that the resistance at the time of penetration and withdrawal of the multi-screw excavator is reduced, and the construction performance is enhanced.

[0035]

As described above, according to the present invention, the motor parts of the plurality of excavating shafts of the multi-shaft underground continuous wall construction machine have a height difference in the height direction with respect to the multi-shaft excavator body. With the arrangement, the ratio of the machine sectional area to the construction sectional area can be reduced, and the resistance of the multi-shaft excavator at the time of intrusion into the ground and withdrawal can be reduced, thereby preventing a decrease in construction performance. .

The excavation shaft rotated by the motor unit disposed above the multi-shaft excavation body is a vertical screw conveyor, so that the soil mud under the construction machine is stirred. Since it is conveyed upward and circulated, a good soil cement can be obtained, and the performance of the formed continuous wall can be remarkably enhanced.

Further, if a screw conveyer in which the screw blades are intermittently arranged or a stirring rod in which the stirring blades are arranged as in claim 3, the structure in which the stirring performance of the soil mud is more emphasized is adopted. It is possible to obtain a good soil cement even with clayey soil having poor kneading properties.

In any of the above embodiments, some of the plurality of prime mover units are arranged below the main body of the multi-shaft excavator, so that the center of gravity of the machine can be reduced and the size can be reduced. It also has the effect that can be done.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a multi-axial underground continuous wall construction machine according to the present invention, wherein (A) is a front view and (B) is a side view.

FIG. 2 is an enlarged front view of a main part of FIG. 1;

3A is a cross-sectional view taken along line AA of FIG. 2, and FIG.
B sectional view, (C) is the same CC sectional view, (D) is the same DD
Sectional view.

FIG. 4 shows a modification of the present invention, wherein (A) shows a case where three excavation axes are used, and (B) shows a case where five excavation axes are used.

FIG. 5 shows another modification of the present invention, wherein (A) is a front view,
(B) is a side view.

6A is a sectional view taken along line AA of FIG. 4A, FIG. 6B is a sectional view taken along line BB, FIG. 6C is a sectional view taken along line CC, and FIG. Sectional view.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Base machine 2 Leader mast 6 Multi-spindle excavator main body 7 Keriva 13 _{1 to} 13 ₁₆ Excavation axis 14 _{1 to} 14 ₁₆ Motor unit 17 Opening 201 _{1 to} 20 ₁₆ Swivel device 21 _{1 to} 21 ₁₆ Auger head

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Nori Oki 8-21-1, Ginza, Chuo-ku, Tokyo Inside Takenaka Corporation Tokyo Main Store (72) Inventor Tateo Kawamura Ginza, Chuo-ku, Tokyo 8-21-1, Takenaka Corporation Tokyo Head Office (72) Inventor Toshio Hinata 8-21-1, Ginza, Ginza, Chuo-ku, Tokyo Inside Tokyo Main Store, Takenaka Corporation (72) Inventor Kamiura Naoki 8-21-1, Ginza, Chuo-ku, Tokyo Inside Takenaka Corporation Tokyo Main Store (72) Inventor Toshiaki Tsuchiya 8-21-1, Ginza, Chuo-ku, Tokyo Takenaka Corporation Tokyo Headquarters In-store (72) Inventor Toshiharu Chikita 2-12-1, Nishiura, Funabashi-shi, Chiba Daiichi Kosan Co., Ltd. (72) Inventor Kazuo Yamazaki 1293 Adocho Hanamigawa-ku, Chiba-shi, Chiba Sanwa Kikai Chiba Co., Ltd. Hall

Claims (3)

[Claims] A plurality of excavating shafts are supported in parallel on a multi-shaft excavator body which is supported by a leader mast or the like so as to be able to move up and down, and a motor unit of a multi-shaft driving unit for rotating and driving each of these excavating shafts is provided. A multi-axial underground continuous wall construction machine, characterized in that the excavator main body is arranged with a height difference in the height direction, and the ratio of the construction machine sectional area to the construction sectional area is reduced 2. An excavating shaft driven by a prime mover disposed above the main body of the multi-screw excavator constitutes a vertical screw conveyor, and is configured to agitate and convey soil mud at a lower portion of the construction machine upward. The multiaxial underground continuous wall construction machine according to claim 1. 3. The multi-axial underground continuous wall according to claim 1, wherein the excavating shaft is constituted by a screw conveyor provided with screw blades intermittently arranged or a stirring rod provided with stirring blades. Construction machine.