JP4386993B2 - Multi-axis underground continuous wall construction machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a multi-axial underground continuous wall construction machine for constructing a soil wall by forming a soil cement column in the ground.
[0002]
[Prior art]
Conventionally, construction of a continuous wall by building a soil cement column in the ground for earth retaining etc. has been performed.
[0003]
The construction machine used for the construction of the soil cement underground continuous wall is generally constructed by attaching a plurality of excavating shafts to an earth auger that moves up and down along the leader mast of the base machine. .
[0004]
Recently, in order to reduce the size and the center of gravity of a machine, for example, a construction apparatus as disclosed in Japanese Patent Laid-Open No. 7-113233 or Japanese Patent Laid-Open No. 10-219734 has been proposed.
[0005]
In any of the above-mentioned publications, a multi-axis excavator is suspended below the leader mast, and a plurality of excavation shafts are supported in parallel by the excavator and are driven to rotate.
[0006]
[Problems to be solved by the invention]
Thus, in the prior art described in the above publication, it is possible to reduce the size of the machine and lower the center of gravity, but there are many prime movers (electric or hydraulic motors) that rotationally drive each excavation shaft of the multi-axis excavator. Since the shaft excavator is arranged side by side in a horizontal row, the cross-sectional area of the multi-axis excavator that enters the ground with respect to the construction cross- sectional area becomes larger, so that the multi-axis excavator penetrates in the highly viscous soil mud. In addition, there is a problem that the drawing resistance is large, the construction speed is significantly reduced, and the construction cost is increased.
[0007]
The present invention has been made with a focus on the above-mentioned problems of the prior art, and has been made to improve the problem. The cross-sectional area of the main shaft of the multi-axis excavator is reduced so that it can be used in highly viscous soil mud. Even so, the intrusion / drawing resistance is reduced to improve the construction efficiency.
[0008]
[Means for Solving the Problems]
As means for solving the above-mentioned problem, the present invention is supported by a leader mast or the like so as to be movable up and down, and is embedded in the soil mud as the excavation proceeds, and the excavator body A plurality of excavating shafts supported in parallel and having an auger head at the lower end, and a prime mover portion of a multi-axis drive unit provided in the multi-axis excavator main body and having an underwater motor that rotationally drives each of the excavating shafts. A prime mover part for driving a drilling shaft arranged in the center of the prime mover part is arranged in an upper part of the multiaxial drilling main body, and a prime mover part for driving a drilling shaft arranged on the outside is provided in the multiaxial drilling Arranged at the lower part of the machine main body, the prime movers are arranged so as to have a height difference in the height direction, and the adjacent auger heads excavate a depth range where the auger heads overlap in the axial direction of the respective excavation axes. as such, each auger And characterized by being arranged head.
[0009]
In the above, the excavation shaft driven by the prime mover arranged in the upper center part of the multi-axis excavator body is composed of a plurality of long excavation shafts, and these excavation shafts are adjacent to each other at the bottom of the multi-axis excavator main body. configure the vertical screw conveyor which is provided on the counter-wound screw vane for stirring and transporting the mud, also, the circulation of it is soil mud said the screw blade in the deployed excavating shaft outward is intermittently arranged and This is a preferable form for improving the stirring.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below with reference to embodiments shown in the drawings.
[0011]
1A and 1B show a front view and a side view of an outer appearance of an embodiment of a multi-axis underground continuous wall construction machine according to the present invention, and a crawler-type self-propelled base machine 1 has a leader. A mast 2 is erected vertically by a support portion 3 and a stay 4 at the front portion of the base machine 1, and a kelly bar guides the elevation of the multi-axis excavator main body 6 to a guide rail 5 on the front side of the leader mast 2. 7 is attached so as to be able to move up and down by engaging guides 8 and 9 provided at the upper and lower parts thereof. The kelly bar 7 is connected via a wire rope 11 via a top sheave 10 at the upper end of the leader mast 2. The winch (not shown) on the base machine 1 can be freely wound up and down. The support of the multi-axis excavator main body 6 is not limited to the support by the kelly bar 7, but may be other means.
[0012]
The multi-axis excavator main body 6 is supported at the lower end of the kelly bar 7. The casing 12 of the multi-axis excavator main body 6 has a knitted vertical oblong shape that is thinner than the Kelly bar 7 in a side view as can be seen from FIGS. 1 (A), (B) and FIG. When viewed from the front, the upper half 12a has a hem-expanding shape that is the same as or narrower than the width of the Kelly bar 7 as it reaches the upper end, and the lower half 12b is constituted by a vertical wall surface, and as a whole. It has a vertically long trapezoidal shape when viewed from the front.
[0013]
1 and excavating shaft ₁₃ 1 of the four in the embodiment shown in FIG. _2, 13 _2, 13 3, 13 if provided with _4, two drilling shaft ₁₃ 2 located in the center side, 13 ₃ of 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 prime mover unit ₁₄ 1 of the drilling shaft ₁₃ 1, 13 ₄ of the both outer sides, 14 ₄ It is disposed at a position close to the outer portion of the two excavating shaft 13 2 of the center _side, 13 ₃ in the lower half 12b of the casing 12.
[0014]
The prime mover section ₁₄ 2, 14 ₃ which is located above the casing 12 is partitioned by the partition wall 15, the prime mover unit ₁₄ 1, 14 ₄ similarly positioned below partitioned by partition wall 16 with respect to the drilling axis ₁₃ 2, 13 ₃ The side surface of the casing 12 between the partition walls 15 and 16 is opened to form openings 17 and 17.
[0015]
Each prime mover 14 _{1-14 4} is constituted by a submersible motor 18 and speed reducer 19, the liquid supply for supplying a chemical liquid mortar in the lower part of the reduction gear 19 to the excavation in the ground through the drilling in the shaft swivel device ₂₀ 1 to 20 ₄ are use rotary joints are provided, respectively, swivel devices ₂₀ 1 to 20 ₄ via a respective drilling axis _131-134 are connected.
[0016]
Also the lower end of the excavating shaft _131-134 has a auger head _{21 1,} 21 _2, 21 3, 21 _4, immediately above the position of the auger head is the drilling axis _131-134 shake each other In order not to exist, it is restrained by the connecting bearing 22.
[0017]
The excavating shaft _131-134 two long excavating shaft ₁₃ 2 located in the center side of the _four, 13 ₃ is a vertical screw conveyor screw vane ₂₃ 2, 23 ₃ is reversely wound with each other, positioned on both sides short excavating shaft ₁₃ 1, 13 ₄ excavating shaft ₁₃ 2 between adjacent adjacent thereto in, 13 ₃ of the screw blade ₂₃ 2, 23 ₃ screw blade ₂₃ 1 in the reverse winding and, 23 ₄ are provided intermittently ing.
[0018]
The drilling shaft ₁₃ 2 is located at the center side, 13 ₃ of the lower end of the auger head ₂₁ 2, 21 ₃ excavation range has a step up and down with has a reverse screw blades ₂₄ 2, 24 ₃ each other one parts adapted to wrap, excavating shaft ₁₃ 1, 13 ₄ of the lower end of the auger head ₂₁ 1, 21 ₄ At the adjacent drilling shaft ₁₃ 2, 13 ₃ of the auger head ₂₁ 1 located on both sides, 21 ₄ screw blade ₂₄ 2, 24 ₄ and drilling by auger head adjacent have a step up and down from the auger head ₂₁ 2, 21 ₃ adjacent and has a screw blade ₂₄ 1, 24 ₄ of the opposite winding respectively The range is partly wrapped. 3A to 3D schematically show cross-sectional forms taken along lines AA, BB, CC, and DD in FIG.
[0019]
In FIG. 1, reference numeral 25 denotes a duct containing a hose and a power cable for supplying a chemical solution through the swivel devices 20 ₁ and 20 ₄ , and 26 and 27 denote the reels. FIGS. 6 (B) and (C) Reference numeral 28 denotes an outer diameter of the auger head for excavation and stirring.
[0020]
Next, the operation of the above embodiment will be described.
[0021]
To construct a continuous wall in the ground moves the base machine 1 to the reclamation position, sets the arrangement direction of the excavating shaft _131-134 as a continuous wall Construction 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, the mortar through swivel device ₂₀ 1 to 20 _4, chemical solution such as cement milk (or air) to 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 performs excavation.
[0023]
As the excavation progresses, the soil mud in the lower part of the multi-axis excavator main body 6 is conveyed upward while being agitated by the screw blades of the excavation shafts 13 _{1 to} 13 ₄ and the auger heads 21 _{1 to} 21 ₄ . This reduces penetration resistance during excavation and does not affect construction speed.
[0024]
Once it reached a predetermined depth while rotating the respective drilling axes _131-134 in the opposite direction into the drawing process hoisting wire rope 11. In this drawing process, the soil mud in the upper part is conveyed downward while being agitated, whereby the drawing resistance is reduced and the construction speed is not affected.
[0025]
Since the both excavation axis _131-134 penetration time and pulling the soil mud circulates vertically while being stirred, Doroneri the sediment is favorably performed, to be construct a good continuous wall quality it can.
[0026]
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 base machine 1 wraps at the end of the already excavated portion. An underground continuous wall can be created by repeating the above steps in sequence.
[0027]
4A and 4B show another embodiment of the present invention. FIG. 4A shows a case where there are three excavation shafts, and FIG. 4B shows a case where there are five excavation shafts.
[0028]
4 3 If present in the (A), located in the upper half 12a center 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, left and right the prime mover unit ₁₄ 6, 14 ₇ drilling axis 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 in FIG. 2, the parts corresponding thereto are given the same reference numerals.
[0029]
4B, in the upper half 12a of the casing 12 of the prime movers 14 ₈ , 14 ₉ , 14 ₁₀ of the three excavation shafts 13 ₈ , 13 ₉ , 13 ₁₀ located on the center side. Are arranged in close proximity to the excavation shafts 13 ₈ and 13 ₁₀ on both sides. Since the other configuration is the same as that in FIG. 2, the parts corresponding thereto are given the same reference numerals.
[0030]
5 and 6 show an embodiment in which four excavation shafts 13 ₁₃ , 13 ₁₄ , 13 ₁₅ , 13 ₁₆ are arranged in a rectangular shape in a horizontal section.
[0031]
In this embodiment, prime movers 14 ₁₃ , 14 ₁₄ that rotationally drive two excavation shafts 13 ₁₃ , 13 ₁₄ at opposite corner positions are disposed above the multi-axis excavator body 6, and the other pair The prime mover portions 14 ₁₅ and 14 ₁₆ of the two excavation shafts 13 ₁₅ and 13 _{16 at} the corner positions are disposed below the multi-axis excavator body 6, and FIG. 6B and FIG. ), The prime mover sections 14 _{13 to} 14 ₁₆ partially wrap with the screw blades of the excavation shafts 13 _{13 to} 13 ₁₆ .
[0032]
Therefore, also in the form of the casing 12 of the multi-axis excavator main body 6, the upper half 12a is thick enough to contain the upper motor parts 14 ₁₃ and 14 ₁₄ in a side view, and only the lower half 12b is the lower motor part. 14 ₁₅ , 14 ₁₆ and other excavation shafts 13 ₁₃ , 13 ₁₄ can be inserted. Since the other structure is the same as that of FIG. 2, the part corresponding to this is attached | subjected only to this and a related code | symbol.
[0033]
Also in this embodiment, the cross-sectional area of the multi-axis excavator body 6 is small with respect to the outer virtual range of the four excavation shafts 13 _{13 to} 13 ₁₆ . As described above, the present invention can be implemented even when the excavation axes are other than the horizontal arrangement, and the intended purpose can be achieved.
[0034]
In any of the embodiments, the prime mover portion that rotates each excavation shaft is disposed with a height difference in the height direction of the multi-axis excavator main body 6, and the construction is performed because the adjacent auger heads overlap each other. The cross-sectional area of the multi-axis excavator body 6 is smaller than the cross-sectional area , so that the resistance when the multi-axis excavator body penetrates and pulls out is reduced, and the construction performance is improved.
[0035]
【The invention's effect】
As described above, according to the invention of claim 1, the cross-sectional area of the multi-axis excavator body can be reduced, thereby reducing the resistance when the multi-axis excavator body penetrates into and out of the ground. Performance degradation can be prevented.
[0036]
Further , according to the invention of claim 2 , since the soil mud at the lower part of the construction machine is conveyed and circulated while being stirred, it can be made a good soil cement, and the performance of the continuous wall to be formed is remarkably enhanced. Can do.
[0037]
Furthermore , according to the invention of claim 3 , it is possible to make a configuration in which the stirring performance of the soil mud is more emphasized, and it is possible to obtain a good soil cement even if the soil quality is poor clay.
[0038]
In any of the above forms, since some of the plurality of prime mover parts are arranged at the lower position of the multi-axis excavator main body, the low center of gravity of the machine can be achieved and the size can be reduced. Also have.
[Brief description of the drawings]
FIG. 1 shows an embodiment of a multi-axis underground continuous wall construction machine according to the present invention, where (A) is a front view and (B) is a side view.
FIG. 2 is an enlarged front view of the main part of FIG.
3A is a cross-sectional view taken along the line AA in FIG. 2, FIG. 3B is a cross-sectional view taken along the line BB, FIG. 3C is a cross-sectional view taken along the line CC, and FIG.
4 shows a modification of the present invention, in which FIG. 2A shows a case in which there are three excavation shafts, and FIG.
5A and 5B show another modified example of the present invention, in which FIG. 5A is a front view, and FIG. 5B is a side view.
6A is a cross-sectional view taken along line AA of FIG. 4A, FIG. 6B is a cross-sectional view taken along line BB, FIG. 6C is a cross-sectional view taken along line CC, and FIG. Sectional drawing.
[Explanation of symbols]
1 base machine 2 reader mast 6 multiaxial excavator body 7 Keriba _{131-134 16} excavating shaft _{14 1-14 16} prime mover section 17 opening ₂₀ 1 _{to 20 16} swivel device ₂₁ 1 _{to 21 16} auger head

Claims (3)

A soil mud buried type multi-axis excavator body that is supported by a leader mast and the like so as to freely move up and down, and is inserted into the soil mud as the excavation progresses,
A plurality of excavating shafts supported in parallel to the excavator body and having an auger head at the lower end;
A motor unit of a multi-axis drive unit provided in the main body of the multi-axis excavator and having a submerged motor that rotationally drives each of the excavation shafts;
Among the prime movers, a prime mover for driving a drilling shaft disposed in the center is disposed above the multiaxial drilling main body, and a prime mover for driving a drilling shaft disposed outside is disposed in the multiaxial excavator main body. The prime movers are arranged so as to have a height difference in the height direction, and adjacent auger heads excavate a depth range overlapping in the axial direction of the excavation shafts. , the multi-axle underground continuous wall construction machine, characterized by comprising placing each auger head The drilling shaft driven by a prime mover disposed in the upper center portion of the multi-axis drilling machine body consists long drilling axis of the several double, with each other these drilling axis adjacent multiaxial excavator underbody soil mud The multi-axial underground continuous wall construction machine according to claim 1, which constitutes a vertical screw conveyor provided with reversely wound screw blades for stirring and conveying.   The multi-axis underground continuous wall construction machine according to claim 1, wherein screw blades are intermittently disposed on the outer excavation shaft.

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