JP2000054426A - Excavator for underground continuous wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To excavate a ditch from an underground continuous wall even in the case of an existing structure being in proximity to a construction predetermined place of the underground continuous wall. SOLUTION: This excavator 11 for an underground continuous wall is provided with a moving frame 12; an excavator body 13 elevatingly suspension- supported to the moving frame 12; a mud lifting hose 15 connected to a mud storage pump 14 built in the excavator body 13; and a mud lifting hose reel 16 installed at the moving frame 12 so as to be able to wind the mud lifting hose 15. The bottom face of the moving frame 12 is provided with two pairs of front and rear traveling wheels in four places in total, and the excavator 11 can travel on tracks 18, 18 laid in parallel, through four traveling wheels 17. Wire sheaves 28a-28d of the moving frame 12 are suitably positioned so that the excavator body 13 can be elevated in vertical space held between pairs of traveling wheels 17, 17, with a position disposed at almost the center of internal space of the moving frame, as a highest position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavator for an underground continuous wall suitable for a place where the height of the head or the construction space is restricted.

[0002]

2. Description of the Related Art A horizontal multi-shaft excavator called a hydrophrase excavator is widely used as a ground excavation machine for constructing an underground continuous wall. The horizontal multi-shaft excavator has a structure in which the ground is dug down vertically by rotating a rotary cutter while being suspended in a groove filled with stabilizing liquid. Is taken up on the ground together with the stabilizing liquid, subjected to a process such as sediment separation, and then returned to the inside of the hole again for circulating use.

[0003] If there is no limit on the head height,
A standard horizontal multi-shaft excavator is used by suspending it in a ditch. However, there are many cases where a working height of only several meters can be secured under an overpass or underground. In such a case, a roadside excavator is suitable.

FIG. 5 shows a conventional under-road excavator. As can be seen from the figure, the conventional under-road excavator
A tower 2 running on the laid track 1 and a tower 2
And the excavator main body 3 suspended in the groove 5, and the excavator main body 3 is suspended in the groove 5 by the hoisting winch 4 installed in the scaffold 2. Further, the tower 2 is equipped with a hydraulic hose reel 6 for winding a hydraulic hose connected to the excavator body 3, a cable reel 7 for winding a measuring cable, and the like.

When excavating using such an under-road excavator, excavated earth and sand is sucked up by a vacuum slurry pump installed on the ground together with a stabilizing liquid via a mud pipe (not shown). It is necessary to add such mud pipes sequentially as the excavator body 3 descends.

[0006]

However, when the restriction of the free space is severe, a short mud pipe must be used, and the excavation efficiency is reduced due to an increase in the number of refills. I was

[0007] That is, to add a mud pipe, first,
A series of operations is required, such as suspending the pumping operation, disconnecting the pumping tube in use, adding a new pumping tube, and finally returning the pump to a vacuum state and then restarting pumping. Therefore, as the number of additions increases, the time ratio of the cutting operation to the total time increases, and the excavation efficiency deteriorates. Also, considering that the operation is performed in a narrow place, a problem also occurs in terms of safety.

Further, in the excavator as shown in the figure, it is necessary to lay the tracks 1 and 1 at a position set back from the groove 5 to some extent. Therefore, existing structures near the groove 5 to be formed, for example, When the pillars stand, there has been a problem that it is difficult to lay the tracks 1 and 1 and run the tracks.

The present invention has been made in consideration of the above-described circumstances, eliminates the trouble and loss time caused by connecting and disconnecting a mud pipe, improves excavation efficiency, and has an existing underground continuous wall to be constructed. It is an object of the present invention to provide an underground continuous wall excavator capable of excavating the underground continuous wall groove even when a structure is close to the underground continuous wall.

[0010]

In order to achieve the above-mentioned object, an underground continuous wall excavator according to the present invention has a pair of traveling vehicles traveling on a track laid in parallel. A mobile gantry provided with wheels, an excavator main body suspended from the mobile gantry so as to be able to move up and down, a mud lifting hose connected to a mud pump built in the excavator main body, and the mud lifting hose. A lifting hose reel installed on the movable base so as to be able to be wound up, and configured so as to raise and lower the excavator body in a vertical space sandwiched between the pair of traveling wheels. is there.

In the excavator for underground continuous wall according to the present invention, the movable gantry is provided with a posture holding mechanism.

Further, in the excavator for an underground diaphragm wall according to the present invention, the posture holding mechanism is provided with a side contact plate.

In the excavator for an underground diaphragm wall according to the present invention, the excavator body is hung in the trench and the bottom surface of the trench is dug down. The excavator body is sandwiched between a pair of traveling wheels. Elevation is performed in the vertical space.

Therefore, the groove in which the underground continuous wall is formed is
The excavation is formed between the pair of traveling wheels, that is, between the tracks laid in parallel. In other words, the excavation proceeds in a posture of straddling the groove.

[0015] Further, with respect to the excavation shearing caused by the excavation, the mud lifting hose is unwound from the mud lifting hose reel in accordance with the elevating of the excavator body, or is wound up by the reel, while the mud pump and the mud pump are being wound. The mud is lifted from the inside of the ditch together with the stabilizing liquid.

As described above, the excavator for an underground diaphragm wall according to the present invention excavates in a posture that straddles a groove, so that the entire width when viewed from the traveling direction can be suppressed. Since the overall height relative to the overall width, that is, the slenderness ratio becomes relatively large, depending on the case, the suspension of the excavator body may be unstable. However, even in such a case, if a posture holding mechanism is provided on the movable gantry, and the reaction holding force is taken from the laying surface of the track or the side wall rising from the laying surface by the posture holding mechanism, the moving gantry is eventually It is possible to prevent the entire underground diaphragm wall excavator from swinging in the direction perpendicular to the traveling direction and to stabilize the posture of the excavator.

In the case where the reaction force is taken from the laying surface of the track, an outrigger such as that used in a hoist can be used as the posture holding mechanism. If a plate is provided, a reaction force can be taken from the side wall by pressing the side contact plate against the side wall rising from the laying surface, so that the space width required for work can be further reduced. .

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an underground diaphragm excavator according to the present invention will be described below with reference to the accompanying drawings. It is to be noted that the same reference numerals are given to components and the like that are substantially the same as those in the conventional technology, and description thereof will be omitted.

FIG. 1 is a plan view and a front view of an excavator for an underground diaphragm wall according to this embodiment, and FIG. 2 is a vertical sectional view along the line AA. As can be seen from these figures, the excavator 11 for underground diaphragm wall according to the present embodiment
And an excavator body 13 suspended on the movable base so as to be able to move up and down.
And an evacuation hose 15 connected to an evacuation pump 14 incorporated in the excavator main body, and an evacuation hose reel 16 installed on the movable gantry 12 so that the evacuation hose can be wound up. Prepare.

Here, a pair of traveling wheels 17, 17 are provided on the bottom surface of the movable gantry 12, two pairs in front and rear, a total of four places, and the tracks 18, 18 laid in parallel by the four traveling wheels 17 are provided. You can run on it.

On the movable gantry 12, a hoisting winch 19 for winding up the excavator body 13, hydraulic hose reels 20, 20 for winding hydraulic hoses to the excavator body 13, a cable reel 21 for winding measurement cables, a motor and a hydraulic pump And the like are provided with a hydraulic unit 22 or the like that accommodates the like.

By installing the hoisting winch 19, the hydraulic hose reel 20, and the mud lifting hose reel 16 in front of and behind the movable gantry 12, the excavator 11 for underground continuous wall is installed.
The total height of is suppressed.

On the other hand, wire sheaves 27, 27 are attached to the upper end of the excavator body 13,
Is wound around the wire sheave 27 via the wire sheaves 28a, 28b, 28c provided on the movable gantry 12, and once wound on the wire sheave 28d of the movable gantry 12, and then on the other wire sheave 27. The winding allows the excavator body 13 to be hung up and down freely.

Here, the wire sheave 2 of the movable gantry 12
8a to 28d show positions where the excavator main body 13 is disposed substantially at the center of the internal space of the movable gantry 12 (the state shown in FIGS. 1 and 2).
Are positioned so that they can be raised and lowered in a vertical space sandwiched between a pair of traveling wheels 17, 17 with the highest position as the highest position.

At the lower end of the excavator body 13, a hydraulically driven rotary cutter 2 is mounted as shown in the front view of FIG.
3 and 23 are provided side by side, two telescopic posture holding plates 24, which are in contact with the inner wall surface of the groove and hold the posture of the excavator body 13, are provided at two locations on the upper and lower sides, respectively. Are provided at four locations on the front and four locations (not shown) on the rear, for a total of twelve locations.

The mud pump 14 mounted at the center of the excavator body 13 has rotary cutters 23, 23.
The excavated waste is sucked together with the stabilizing liquid from a suction port 25 disposed between the two, and is pumped to a mud hose reel 16 via a mud hose 15. The muddying hose reel 16 is provided with a discharge port 26, and the excavated cuttings and the stable liquid discharged from the discharge port are sent to a muddy water treatment plant (not shown) for processing.

On the other hand, four outriggers 51 are provided below the movable gantry 12, and as can be clearly seen from FIG. 2, the elevating legs 53 attached to the tips of the arms 52 constituting the outriggers are lowered to lower the track. By making contact with the laying surface 30, the posture of the movable gantry 12 and thus the excavator 11 for underground continuous wall in the direction orthogonal to the track is enhanced, and the excavator 11 functions as a posture holding mechanism for preventing the excavator 11 from falling or shaking in this direction. . Note that the arm 52 of the outrigger 51 is preferably made to be able to expand and contract, and when the posture stabilization by the outrigger is not necessary, the arm 52 can be contracted.

Excavator 11 for underground diaphragm wall according to this embodiment
In FIG. 3, as shown in FIG.
The excavator body 13 is lifted and lowered in a vertical space sandwiched between a pair of traveling wheels 17, while being suspended in the inside 1 and digging down the bottom surface of the groove.

For this reason, the groove 31 for the underground continuous wall is formed by excavation between the portion between the pair of traveling wheels 17, 17, in other words, between the tracks 18, 18 laid in parallel. Excavation proceeds in a posture straddling 31.

The excavation shearing caused by the excavation is controlled by the lifting mud hose 15 as the excavator body 13 moves up and down.
Pumping out the mud pump 14 and the mud hose 1 while unwinding from the mud lifting hose reel 16 or winding it up with the reel.
The mud is pumped up from the inside of the groove 31 together with the stabilizing liquid via 5.

As described above, according to the excavator 11 for an underground continuous wall according to the present embodiment, the excavation is performed in such a manner as to straddle the groove 31, so that the excavator is viewed from the track running direction. A so-called thin excavator in which the total width W (see FIG. 2) is suppressed to, for example, about 1.8 m can be provided.

Therefore, as shown in FIG. 3, even when the existing structure 32 such as a pillar stands on the track laying surface 30, as long as a traveling width of, for example, about 2 m can be ensured, along the traveling width. It is possible to excavate the trench 31 for the underground diaphragm wall at the place where it was excavated. The trench 31 for the underground continuous wall can be excavated even in a narrow place.

Further, according to the excavator 11 for an underground diaphragm wall according to the present embodiment, since the mud pumping hose 15 is used instead of the mud pipe, an empty space for adding the mud pipe is increased. It becomes unnecessary. By installing the hoisting winch 19, the hydraulic hose reel 20, and the mud lifting hose reel 16 in front of and behind the moving gantry 12, the overall height of the excavator 11 for underground continuous walls can be suppressed to, for example, about 5 m. In the end, if a head equivalent to the total height of the underground continuous wall excavator 11 is secured, it becomes possible to excavate a trench for the underground continuous wall excavator. In places where it is impossible, for example, where the head is limited by slabs or beams of existing buildings, trenches 31 for underground diaphragm walls
Can be drilled.

In the prior art, due to the height of the head,
Even in a place where a short mud pipe needs to be replenished many times, using the underground continuous wall excavator 11 of the present embodiment eliminates the need for replenishing the mud pipe and restarts mud pumping. Every time there is no need to return the inside of the pump to a vacuum, the efficiency of excavation in places with limited headspace, such as underground or under elevated, is dramatically improved. In addition, the safety of the work is improved because the refilling work in a narrow place is eliminated.

Further, according to the excavator 11 for an underground diaphragm wall according to the present embodiment, the outrigger 5
1, the lowering leg 53 of the outrigger is brought into contact with the track laying surface 30 so that the movable mount 12
As a result, the posture stability of the excavator 11 for the underground diaphragm wall in the direction orthogonal to the track can be enhanced, and the falling or shaking in the direction can be prevented.

In the present embodiment, as described above, the mud pipe is used instead of the mud pipe, and the hoisting winch 19 and the like are installed in front and rear of the movable gantry 12, thereby making it possible to use the underground continuous wall. The total height of the excavator 11 is, for example, 5000
mm, it is possible to excavate the trench 31 for the underground continuous wall even in a head-limited location where construction would not be possible conventionally, but as shown in FIG. If the head is extremely low because the head 41 is extremely low, as shown in FIG.
May be excavated in advance, the tracks 18, 18 may be laid on the work surface 43 and the excavator 44 for underground continuous wall may be run.

The underground excavator 44 is substantially the same as the underground excavator 11 described above, but a different attitude holding mechanism is provided below the movable gantry 12 in place of the outrigger 51. 45 is provided.

The posture holding mechanism 45 includes a telescopic arm 47.
Abutting plate 46 attached to its end by extending
Is pressed against the side wall 44 rising from the work surface 43 to take a reaction force from the side wall to increase the posture stability of the movable gantry 12 and thus the underground continuous wall excavator 44 in the direction orthogonal to the orbit, and Falling or shaking can be prevented. Note that, unlike the outrigger type, the posture holding mechanism 45 according to this modification can directly take a reaction force from the side wall 48, so that the space width W ′ required for excavation work can be extremely reduced. . The other configuration is the same as that of the underground continuous wall excavator 11 described above, and a description thereof will not be repeated.

[0039]

As described above, according to the underground continuous wall excavator according to the first aspect of the present invention, since the excavation is performed in such a manner as to straddle the groove, the excavator is viewed from the track running direction. The total width of the case can be suppressed to, for example, about 1.8 m.
Therefore, even when existing structures such as pillars stand on the track laying surface, if a traveling width of, for example, about 2 m can be secured, a trench for an underground continuous wall is excavated at a location along the traveling width. It is possible to do. Further, even in a place where a conventional underground diaphragm excavator is impossible, for example, even in a place where the head is limited by a slab of an existing building, it is possible to excavate a trench for an underground diaphragm wall. it can.

Further, according to the excavator for underground continuous wall of the present invention according to claim 2, the posture stability of the movable gantry and eventually the excavator for underground continuous wall in the direction orthogonal to the track is enhanced, and This also has the effect of preventing falling or shaking.

According to the excavator for underground continuous wall according to the third aspect of the present invention, unlike the outrigger type, the reaction force can be directly taken from the side wall, so that the space limit width W required for the work is obtained. 'Can be made extremely small.

[0042]

[Brief description of the drawings]

FIG. 1 is a diagram of an underground diaphragm excavator according to an embodiment, wherein (a) is a plan view and (b) is a front view.

FIG. 2 is a vertical sectional view taken along the line AA of FIG.

FIG. 3 is a vertical cross-sectional view showing a state of excavating using the excavator for an underground diaphragm wall according to the present embodiment.

FIG. 4 is a vertical sectional view of an underground diaphragm excavator according to a modification.

FIG. 5 is a side view of an underground diaphragm excavator according to the related art.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 Excavator for underground continuous wall 12 Moving stand 13 Excavator main body 14 Mud pump 15 Mud hose 16 Mud hose reel 17 Running wheel 18 Track 45 Attitude holding mechanism 51 Outrigger (Attitude holding mechanism)

Claims (3)

[Claims] 1. A mobile gantry provided with a pair of traveling wheels running on a track laid in parallel, an excavator main body suspended from the mobile gantry so as to be able to move up and down, and a built-in main body of the excavator main body. A lifting hose connected to the lifting pump, and a lifting hose reel installed on the movable gantry so as to be able to wind up the lifting hose. An excavator for an underground diaphragm wall configured to be raised and lowered in a vertical space sandwiched between running wheels. 2. The excavator for underground continuous wall according to claim 1, wherein an attitude holding mechanism is provided on the movable gantry. 3. An excavator for an underground continuous wall according to claim 2, wherein a side contact plate is provided in said posture holding mechanism.