JP2002322669A - Construction machine for continuous underground wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction machine for a diaphragm wall providing uniform and high-quality soil cement with excavation soil sufficiently mixed and stirred over the whole length of a groove hole and providing a favorable working environment. SOLUTION: This diaphragm wall is so constructed that a hardening material such as cement milk is fed to the ground while excavating the groove hole, the excavation soil and the hardening material are stirred to form the soil cement, and the excavation and stirring works are repeated with the groove holes sequentially adjoined together so as to continue the wall. A rotation drive unit 3 is liftably provided in a leader 2 erected in the front part of the construction machine body 1 and a screw rod 5 attaching a screw blade 5a is attached to the lower end. An excavation device 6 with multiple excavation blades 6b attached ground the outer circumference of an endless chain 6a is provide in the lower end of the screw rod 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground continuous wall construction machine for excavating a trench in the ground, supplying a solidified material, mixing and mixing the excavated soil and the solidified material to form a continuous wall. is there.

[0002]

2. Description of the Related Art Conventionally, a solidified material such as cement milk is supplied while excavating a pit in the ground, and the excavated soil and the solidified material are agitated and mixed to form a soil cement. A construction machine that constructs a continuous wall by repeating an operation adjacent to a hole is known (for example, JP-A-8-333770).

In this construction machine, as shown in FIG. 6, a kelly bar 35 is provided so as to move up and down on a reader 2 provided upright at the front of a construction machine body 1, and a drilling and stirring device 32 is provided at a lower end of the kelly bar 35. ing. Then, while driving the excavating and stirring device 32, the excavating device 32 is lowered by its own weight to excavate a slot in the ground, while supplying a solidifying material such as cement milk and mixing and stirring.

[0004]

In such a conventional construction machine, since the excavating and stirring device is not moved in the lateral direction, the resistance of excavation and agitation is small, the size of the excavating and stirring device can be reduced, and the underground wall with high accuracy can be constructed. it can.

However, in this construction machine, the excavated soil and the solidified material are sufficiently stirred and mixed in the range of the entire length of the excavating and stirring device, but since there are various strata in the ground, the depth of the slot is small. In terms of the total length, the excavated soil cannot be homogeneous, and there is a problem that uneven soil cement cannot be avoided.

[0006] The excavating and stirring device is rotationally driven by a hydraulic motor provided in the excavating and stirring device itself. The construction machine main body and the hydraulic motor built in the excavating and stirring device are connected by a hydraulic hose. However, the hydraulic hose moves in the soil with excavation, so that the hydraulic hose is easily damaged, and the hose reel 34 has a leader. Not only is the processing of the hydraulic hose complicated, such as by attaching it to a reel, but also the disadvantage is that the appearance of the construction machine main body is impaired and the working environment is poor because the hydraulic hose covered with mud is locked to the leader.

Accordingly, the present invention provides a construction machine for underground continuous wall in which excavated soil is sufficiently mixed and stirred over the entire length of the slot, uniform and high quality soil cement is obtained, and the working environment is good. It is intended to be.

[0008]

To achieve the above object, the present invention employs the following means. That is, in the underground continuous wall construction machine which excavates a trench in the ground and supplies the solidified material, mixes and mixes the excavated soil and the solidified material to construct a continuous wall, the front part of the self-propelled construction machine body A rotary drive device is provided on a vertically standing leader so as to be able to ascend and descend, a screw rod provided with a screw blade is attached to a lower end of the rotary drive device, and a plurality of excavating blades are provided on an outer periphery of an endless chain at a lower end of the screw rod. It is characterized by having a drilling device.

The construction machine of the present invention performs vertical excavation while supplying the solidified material, mixes and agitates the excavated soil and the solidified material to form soil cement, and sequentially adjoins the previous excavated groove. The work is repeated to build the underground wall, excluding a slot excavator that simply discharges excavated soil to the surface to form a groove.

The screw rod is provided with screw blades in a direction for transferring excavated soil upward. When a plurality of screw rods are provided, the rotation direction of the adjacent screw rods is preferably reversed. In addition, if a stirring blade is attached to the screw rod, the efficiency of mixing and stirring the excavated soil and the solidified material can be further increased. Note that a screw rod provided with a stirring blade is included in the present invention.

The excavator is provided with a plurality of excavating blades on the outer periphery of an endless chain. The number of the excavators is not particularly limited. However, when a plurality of excavators are used, the circumferential movement directions of the endless chain are opposite to each other. Is good. When the excavation depth is longer than the length of the leader, a screw rod may be added.

If the excavator is driven by transmitting the rotation of the screw rod directly by the speed reduction mechanism, the hydraulic hose may be driven by a hydraulic motor built in the excavator. Since it is not necessary to route the drill to the excavator, it is simple and the appearance of the construction machine is good.

[0013] The reduction mechanism may be a combination of gears,
What is necessary is just to comprise by existing conduction means, such as combining a gear and a chain, and it does not specifically limit.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings. As shown in FIG. 1, the underground continuous wall construction machine is provided with a rotary drive device 3 having a drive motor engaged with a guide rail 2 a of a leader 2 erected at the front of a construction machine main body 1. An elevating device 4 is provided in connection with the rotary driving device 3. As shown in FIG. 2, three screw rods 5 provided with screw blades 5a are attached to the lower end of the rotary driving device 3, and an excavator 6 is attached to the lower end thereof via a speed reduction mechanism 10. I have.

The lifting device 4 is formed by engaging a pinion driven by a hydraulic motor with a rack fixed vertically to the reader 2, and by driving the pinion, the rotary driving device 3 is attached to the guide rail 2 a of the reader 2. It is guided and goes up and down vertically. The screw rods 5 are rotated by the rotation driving device 3, and the adjacent screw rods 5 rotate in opposite directions. The central screw rod 5 is hollow and serves also as a supply path for the solidified material.
The screw blades 5a are alternately intermittently provided so as not to overlap with the adjacent screw rods 5.

As shown in FIG. 3, the screw rod 5 may be provided with a stirring blade 5b. The shape of the stirring blade 5b may be an appropriate one such as a flat plate or a round bar. The screw rod 5 can be added according to the excavation depth, and can be constructed even in the case of a slot deeper than the entire length of the leader 2. Reference numeral 7 denotes a vibration damping device for the screw rod 5, which is fixed below the reader 2.

The excavator 6 has a plurality of excavating blades 6b fixed at substantially equal intervals on the outer periphery of a chain 6a wound between sprockets 6c and 6d, and two sets of excavating blades 6 are provided. The sprockets 6c are configured to rotate in opposite directions as indicated by arrows.

As shown in FIG. 4, the reduction mechanism 10 meshes a bevel gear 12 with a bevel gear 11 attached to the lower end of the screw rod 5 in a gear box 19, and converts a gear 13 fixed to a shaft of the bevel gear 12 into a gear 14. , Gear 1
5, the gear 16 and the gear 17 are sequentially engaged with each other,
To the gear 18 provided on the drive shaft 18 of the sprocket 6d. Reference numeral 8 denotes a solidification material supply pipe, which is connected to the central screw rod 5.

Reference numeral 20 denotes a cutter drum fixed to the shaft of the sprocket 6c of the excavator 6 for excavating a groove width by which the gear box 19 projects in the width direction of the excavator 6. The cutter drum 20 includes a drum 21 that rotates simultaneously with the sprocket 6c, and an excavating blade 22 similar to the excavating blade 6b on the outer periphery thereof.

Next, the operation of the thus constructed underground continuous wall construction machine will be described. First, the rotation driving device 3
The outrigger is operated at a predetermined position where the excavating device 4 is positioned above the leader 2 (the state shown in FIG. 1) to excavate the excavator, thereby fixing the construction machine main body 1 on the ground so that the reader 2 is vertical. After the adjustment, the rotary driving device 3 and the lifting device 4 are driven to excavate the slot.

The three screw rods 5 are rotated by the driving of the rotary driving device 3, and the bevel gear 12
Rotates, and transmits the gears 13 to 17 to rotate the sprocket 6 d of the excavator 6. As a result, the chain 6a wound around the sprocket 6c on the driven side moves around and is excavated by the excavating blade 6b attached to the chain 6a, and at the same time, the cutter drum 20 attached to the shaft of the sprocket 6c. Is also rotated, and excavation is performed by the excavation blade 22. In addition, the solidified material is injected from the solidified material supply pipe 8, and is mixed with the excavated soil by stirring.

The excavated soil excavated by the excavating blade 6b and the excavating blade 22 is mixed and agitated with the solidified material with the advance of the excavating device 6, and the screw blade 5 of the screw rod 5 is rotated.
It is carried upward by a. Therefore, excavated soil does not accumulate around the excavator 6, so that excavation efficiency is high. Further, since the screw blades 5a are intermittently attached so that the screw rods 5 on both sides and the central screw rod 5 do not interfere with each other, even if different soils are in the middle,
Since the excavated soil is sufficiently mixed in the vertical direction by the screw blades 5a, uniform soil cement is formed.
Furthermore, when the thing provided with the stirring blade 5b shown in FIG. 3 is used, the excavated soil and the solidified material carried upward by the screw blade 5a are stirred and sufficiently mixed by the stirring blade 5b.

After excavation to a predetermined depth, the direction of rotation of the hydraulic motor of the rotary drive unit 3 is reversed, and the excavator 10 is pulled up by the lifting device 4. As a result, the soil cement in which the excavated soil and the solidified material are mixed and agitated is sent downward, and fills the lower space created as the excavator 6 is raised.

Next, excavation work is performed by moving the construction machine body 1 to a position adjacent to the above-mentioned slot. In this way, the drilling operation is continued so that the slot is continuous, and a continuous wall of soil cement is constructed. FIG. 5 shows an embodiment in which one set of excavators 6 is provided.
It is a book. And solidification material supply pipes 8 are provided on both sides thereof. In this case, since the excavator 6 is one set, the excavator can be made small and lightweight, and can be mounted on a small construction machine to perform construction at a narrow site.

[0025]

As described above, the underground continuous wall construction machine according to the present invention is provided with a rotary drive device which can be moved up and down on a leader erected at the front of a self-propelled construction machine body. A screw rod with a screw blade attached to the lower end of the device, and a drilling device with a plurality of drilling blades attached to the outer periphery of the endless chain was provided at the lower end of the screw rod. While being extruded, it is carried upward by the screw blade 5a of the screw rod 5, and excavated soil does not accumulate around the excavator 6, so that excavation efficiency is high. Also, even if different strata are on the way,
The excavated soil in the vertical direction is sufficiently mixed and stirred by the screw blades 5a to form a uniform soil cement, and a wall with less variation in strength can be constructed. In addition, if the drive shaft of the excavator 6 is driven by transmitting the rotation of the screw rod by a speed reduction mechanism as in claim 2, the drive shaft of the excavator 6 may be driven by a conventional hydraulic motor as in a conventional hydraulic motor. There is no need to wind the hose around a hose reel or the like, and the construction environment of the construction machine is improved.

[Brief description of the drawings]

FIG. 1 is a side view of an underground continuous wall construction machine according to an embodiment of the present invention.

FIG. 2 is an AA view of FIG. 1;

FIG. 3 is a view showing another embodiment of the screw rod 5;

FIG. 4 is a sectional view of the speed reducer 10;

FIG. 5 is a front view showing the embodiment in the case where one set of the excavators is used.

FIG. 6 is a side view of a conventional underground continuous wall construction machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Construction machine main body 2 ... Leader 2a ... Leader guide 3 ... Rotation drive device 4 ... Lifting device 5 ... Screw rod 5a ... Screw blade 5b ... Stirring blade 6 ... Drilling device 6a ... Endless chain 6b ... Drilling blade 6c, 6d ... Sprocket 7: Detent device 8: Solidified material supply pipe 10: Reduction mechanism 11, 12: Bevel gear 13, 14, 15 ... Gear 16, 17 ... Gear 18 ... Drive shaft 19 ... Gear box 20 ... Cutter drum 21 ... Drum 22 ... Drilling blade 32 ... Drilling stirrer 34 ... Hose reel 35 ... Keriba

Claims (2)

[Claims] An underground continuous wall construction machine for excavating a trench in the ground, supplying a solidified material, mixing and stirring the excavated soil and the solidified material to form a continuous wall, and a self-propelled construction machine main body. Provide a rotary drive device to be able to ascend and descend to the reader erected at the front of the
A screw rod having a screw blade attached to a lower end of the rotary driving device, and an excavator having a plurality of excavating blades attached to an outer periphery of an endless chain is provided at a lower end of the screw rod. Construction machine. 2. The underground continuous wall construction machine according to claim 1, wherein the drive shaft of the excavator is driven by transmitting rotation of a screw rod by a reduction mechanism.