JP2654719B2 - Simple underground continuous wall method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention is intended to excavate underground by a chain saw method to form a small, narrow continuous wall, and particularly to excavate a trench in a sharp direction. The present invention relates to a simple underground continuous wall construction method in which a guide member around which a chain is installed is inclined so as to be inclined and is left in an excavation trench to construct a wall body.

[Conventional technology]

Conventionally, a bucket method, a bit method, and the like have been used as a method for continuously excavating a narrow groove.However, in these methods, the excavation width is 40 to 50 cm or more. Economical construction was difficult in large-scale construction, and advanced know-how based on engineering knowledge and construction experience, such as drilling technology and management of stable liquid, was required. Also,
In order to prevent collapse of the ground at the time of excavation, a stabilizing solution and a guide wall are required, and it is difficult to excavate in close proximity to existing facilities. For this reason, the present applicant has previously proposed a simple underground continuous wall construction method described in JP-A-1-250520. In this method, the underground is excavated by a chain saw technique, and a continuous wall is formed through an arbitrary number of grooves formed thereby. According to this method, a narrow wall body can be easily and economically formed without using a stabilizing solution or a guide wall, and construction close to an existing building becomes possible.

However, when a continuous wall body is formed based on this method, particularly when the above-mentioned groove is formed vertically from the ground surface and then a wall body is formed in the groove, the wall body is displaced from the ground surface by the stress of earth pressure. As it goes downward, it is inclined, and as a result, a continuous wall having an original angle cannot be formed.

In addition, the continuous wall is formed by the conventional method, and then,
When forming a construction excavation, due to the stress of the earth pressure,
There is a risk that the formed continuous wall may be deformed or collapsed during or after excavation of the construction excavation portion, and the reliability is poor.

[Problems to be solved by the invention]

Therefore, the present invention aims to eliminate the above-mentioned disadvantages of the prior art.
Focusing on the fact that the stress of earth pressure varies depending on the depth in the ground, the excavation angle is corrected in advance, and it is possible to excavate and effectively prevent the adverse effect on the continuous wall, the simple underground continuous wall method It is intended to provide.

[Means for solving the problem]

That is, in order to achieve the above object, the present invention firstly provides an endless track-shaped excavating chain via a vertically movable guide member guided by a leader arranged at an adjustable upright angle. The excavator having a guide member that is freely movable and detachably provided around the guide member, the lower side of the guide member is angle-adjusted to the anti-excavator side, and then the excavating chain is rotated. While excavating from the ground surface to the ground, the guide member is transferred to the ground, after excavating a predetermined depth, the excavation chain is pulled out of the ground, and the guide member is left under the ground and one The present invention is characterized in that a wall is constructed, and further a continuous wall is constructed by connecting another wall to the lateral position of the wall in the construction step.

Secondly, at least one pair of walls formed through the trenches excavated by the above-described method is disposed in a C-shape on both sides of the construction excavation portion, and the C-shape is provided. The present invention is characterized in that the construction excavation part is excavated and constructed while an arbitrary number of uplifts are provided between the walls.

[Action]

The present invention constituted by the above means provides a groove by excavating a guide member around a drilling chain disposed on an excavator from the surface of the ground to an underground in a state where the guide member is inclined toward the excavator. Since the wall is formed through the groove, the wall has a tilt angle corresponding to the tilt angle of the drilling chain. Therefore, the above-mentioned wall is formed in a state where the angle is corrected to an angle which should be originally formed from the ground surface by the stress of earth pressure.

Further, the wall body formed in such an inclined manner is formed in at least a pair of C-shape, and by excavating a construction excavation portion through an arbitrary number of rises between the pair of wall bodies, Deformation or collapse during or after excavation due to earth pressure of the pair of walls can be effectively avoided in advance.

〔Example〕

Hereinafter, in order to further clarify the gist of the simple underground continuous wall construction method of the present invention, an embodiment using drawings will be described.

An excavator 1 used to carry out this method includes an elongated leader 12 vertically erected in front of a driver's cab 11 on which a driver rides, and guide members 12a, 1
A guide member 14 which is supported so as to be able to move up and down via 2b, and on which an endless track-shaped chain 13 is disposed so as to be able to run freely.
And The reader 12 is supported by a support shaft 15 formed at the front end of the cab 11 and a fixed portion 17 having a tip end of a hydraulic cylinder 16 fixed to the cab 11, and the hydraulic cylinder By the hydraulic operation 16, it is rotatable around the support shaft 15. In the present embodiment, the guide member 14 is formed of a steel casing, and a drive unit 18 for driving the chain 13 to travel is disposed at an upper end side.

In the excavator 1, a plurality of wire ropes 20 and 21 extend from a plurality of winches (not shown) disposed in the cab 11 to a guide member 12a supporting the guide member 14.
The guide members 14 are moved up and down by the operation of winding the wire ropes 20 and 21 by these winches.

As shown in FIG. 1, the excavator 1 according to the above-described configuration is moved closer to the existing facility A, and the leader
The guide member 14 is tilted by rotating the guide member 12 clockwise in FIG.

The inclination angle θ of the guide member 14 is appropriately determined depending on the depth of the groove to be formed, since the stress of the earth pressure is larger below the groove, but usually, the inclination angle θ shown in FIG. The angle may be about 1 to 2 degrees from the line.

After tilting the guide member 14 in this manner, the drive unit 18 is driven to drive the chain 13 and the guide member 14 is lowered along the reader 12 by the winch winding operation. Excavation is performed downward from the ground surface 26 by a large number of excavating claws attached to the chain 13. The groove 27 formed by this is connected to the guide member 14.
Is tilted in accordance with the tilt angle θ.

Then, after excavation of the groove 27 having a predetermined depth is completed by the operation of the excavator 1, a wall is formed through the groove 27. This wall body separates the drive unit 18 from the guide member 14, releases the chain 13 from the endless track state by extracting a pin (not shown), and collects only the chain 13 by driving the drive unit 18 again. The guide member 14 is formed so as to remain in the groove 27. In this way, the guide member
The steel casing for forming 14 is directly used as the wall 22, and a plurality of the walls 22 are formed along the existing facility A to form a continuous wall.

Next, a pair of continuous walls opposing each other at a predetermined interval using the above-described method are formed in a C-shape in the ground, and excavation is performed between the two walls to form a construction excavation portion. I do. At this time, as the ground surface is gradually excavated, as shown in FIG. 2, the wall rises from one wall body 22 to the other wall body 23.
24 are fixed and go. That is, the pair of wall bodies 2
After digging a predetermined depth between 2 and 23 to form a construction digging portion 25 having a predetermined depth, first, a plurality of first bulges 24a are formed from the one wall 22 to the other wall 23. In the order of excavating to a predetermined depth, and then fixing a plurality of second protruding parts 24b after the excavation to a predetermined depth, in order as the construction excavation part 25 is excavated and gradually formed downward. 24 rises downward
a, 24b, 24c, 24d ... are fixed.

If the continuous wall is formed by the above-described method, even when each of the walls 22 and 23 is pressed by the stress F of the earth pressure which is larger as going downward, the walls 22 and 23 are previously formed by the stress F. Since the walls 22 and 23 are formed to be inclined at the inclination angle θ corresponding to the inclination angle, the walls 22 and 23 are finally corrected in accordance with the earth pressure and formed in the vertical direction which is the direction in which the wall is originally constructed.

Further, a pair of the wall bodies 22 and 23 are formed so as to face each other, and a space between the pair of wall bodies 22 and 23 is excavated to form a construction excavation part.
In the case where the wall 25 is formed, as described above, by fixing a plurality of protuberances 24 between the wall bodies 22 and 23 facing each other, each wall body is excavated or excavated due to the stress of earth pressure. Later deformation can be effectively prevented in advance.

In the above embodiment, as a method of forming a wall in a groove formed by an excavator, a guide member for mounting an excavation chain is formed by steel casing, and a wall body in which the guide member is left in the groove. I explained the construction method
The step of forming the wall, which is a component of the present invention, is not limited to this method. For example, the guide member may be formed of concrete in advance, and the guide member may be left in the groove to form a wall. It is needless to say that any of these changes does not change the gist of the present invention at all, as long as the object, operation and effects described below are achieved.

[Effects of the Invention] As described above, the present invention is guided by a leader having a length sufficient to excavate a wall body to a predetermined depth, and
An excavator having a guide member which can freely move along an endless track-shaped excavation chain via a guide member which can be freely raised and lowered and which can be adjusted vertically, and which is detachably provided around the excavation chain. In the state where the lower side of the guide member is tilted toward the anti-excavator side, the groove is formed by excavating from the surface of the ground toward the ground, the guide member is left in the groove, and the excavating chain is removed. Remove, take out from the surrounding state, form one wall, and in this construction process, successively connect the other walls to the lateral position of the wall to form a continuous wall, so that the continuous wall is ,
The guide member has an inclination angle corresponding to the inclination angle at the time of excavation, and therefore, the construction can be performed in a stable form in a state where the angle is to be originally formed from the ground surface by the stress due to the earth pressure.

In addition, by forming the wall body formed in such an inclined manner at least in a pair of C-shape, and excavating a construction excavation portion through an arbitrary number of prongs between the pair of wall bodies, The risk that the pair of walls deform or collapse during or after excavation of the construction excavation portion due to earth pressure can be effectively prevented in advance, and the safety of workers can be sufficiently ensured.

[Brief description of the drawings]

The drawings show an embodiment of the simple underground continuous wall construction method of the present invention. FIG. 1 is a side view showing an essential part of a groove inclined by an excavator, and FIG. It is sectional drawing which shows the principal part of the state fixed between. 1 ... excavator 13 ... chain 14 ... guide member 22 ... one wall 23 ... other wall 24 ... bulging 25 ... construction excavation part 27 ... groove

Claims (2)

(57) [Claims] An endless track-like excavating chain is freely and detachably mounted via a vertically movable guide member guided by a leader arranged at an adjustable elevation angle. Of the excavator having the guided member, the lower side of the guide member is angle-adjusted to the anti-excavator side, and then the excavating chain is rotated while excavating from the surface to the ground. Transferring the guide member into the ground, excavating a predetermined depth, removing the excavating chain from the ground, leaving the guide member in the ground, constructing one wall, A simple underground continuous wall construction method, wherein a continuous wall is constructed by connecting another wall body to a lateral position of the wall body. 2. A construction in which at least one pair of walls formed through a groove excavated by the method according to claim 1 is arranged in a C-shape on both sides of a construction excavation part. A simple underground continuous wall construction method, wherein the construction excavation portion is excavated and constructed through an arbitrary number of uprights between the wall bodies provided in the construction.