JPH11172668A - Washing method of joint end face of diaphragm wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To wash a joint end face economically. SOLUTION: The washing method is conducted after a preceeding panel 14 is formed by a diaphragm wall method, a ground is excavated while cutting the joint end face 16 of the preceeding panel 14 by an excavator 12, in which a rotated and driven rotating drum 10 is installed at a lower end, and a drilled pit 18 for a subsequent panel is formed. The excavator 12, in which washing brushes 26 are mounted on a section, from which a cutter ties 22 is removed, is set up, under the state, in which wire brushes for the washing brushes 26 are brought into contact with the joint end face 16, and a main body 20 is moved in the vertical direction while turning and driving the rotating drum 10. When such operation is conducted, mud films adhering on the joint end face 16 of the preceeding panel 14 can be removed by the wire brushes, and cages are built into the excavated pit 18 and concrete is placed after the operation is completed, and the subsequent panel us formed in a placing joint manner.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of cleaning a joint end face of an underground continuous wall, and more particularly to a method of cleaning the joint end face of an underground continuous wall.

[0002]

2. Description of the Related Art When constructing an underground structure, it is known to use an underground continuous wall for a retaining wall, a foundation frame, and the like. The basic construction process of the underground diaphragm wall is to excavate a groove-shaped excavation hole from the surface side of the ground, build a steel cage in the excavated excavation hole and cast concrete to form a panel wall. It has become.

[0003] In this kind of underground continuous wall construction method, there are rigid joints, hinge joints, free joints and the like in connection structures between the leading and trailing panels, and are selected according to the purpose of use of the underground continuous walls. Have been.

[0004] Of these joining structures, free joining is
It is a method of cutting the joint end face of the preceding panel,
Usually, after excavating the ground while cutting the joint end face of the preceding panel by using an excavator provided with a rotating drum that is driven to rotate at the lower end, a succeeding panel is joined to the joint end face of the preceding panel.

[0005] However, this type of conventional joining structure has the following technical problems.

[0006]

That is, in the free joining in which the joined end face of the preceding panel is cut, the cut joined end face may not be washed, but if not washed, it will adhere to the joined end face. Due to the presence of the mud film, the integrity between panels and the waterproofness may be insufficient.

Therefore, in order to clean the joint end face in order to maintain a high level of water stoppage between the panels, a dedicated cleaning device must be installed before the subsequent panel is formed by excavation for forming the subsequent panel. It was installed in the hole and the cut end face was cleaned with a water jet or brush.

[0008] However, such a method of cleaning the joint end face has a problem that much time and labor are required for replacing machines and laying pipes, and the cost is also high.

SUMMARY OF THE INVENTION The present invention has been made in view of such conventional problems, and it is an object of the present invention to provide a method of cleaning a joint end face of an underground continuous wall, which can be performed at low cost.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention excavates the ground while cutting the joint end face of the preceding panel with an excavator having a rotary drum provided at the lower end thereof. Later, in a method of constructing an underground continuous wall in which a trailing panel is joined to the joining end face of the preceding panel, after excavating an excavation hole for the trailing panel, the excavator is connected to the joining end face of the preceding panel. The excavator is moved up and down while the cleaning brush is in contact with the joint end surface. According to the cleaning method configured as described above, a dedicated cleaning device is not required, and the bonded end surface can be cleaned without replacing the machine. In the cleaning method of the present invention, the cleaning brush has a common mounting structure with a cutter tooth fitted to the rotating drum, and can be fitted and fixed to a portion from which the cutter tooth has been removed. According to this configuration, since the mounting structure of the cleaning brush and the cutter tooth is shared, the joint end face can be cleaned by replacing the cleaning brush and the cutter tooth. In the cleaning method of the present invention, the cleaning brush may be attached to a lower end of the excavator body of the excavator so that a tip protrudes outward of a cutter tooth fitted to the rotary drum. it can. According to this configuration, the cleaning brush is attached so that the tip protrudes outward of the cutter teeth. Therefore, when the excavator is moved up and down, the tip of the cleaning brush comes into contact with the joining end face and the joining end face. Cleaning becomes possible.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 4 show one embodiment of the method of cleaning the joint end face of the underground continuous wall according to the present invention.

In the cleaning method of the present invention, the preceding panel 14 is formed by an underground continuous wall method, and as shown in FIG.
The excavator 12 provided with a rotating drum 10 rotatably driven at the lower end excavates the ground while cutting the joint end surface 16 of the preceding panel 14, and excavates the ground 1 for the following panel.
8 is performed.

The excavator 12 of this embodiment is a hydrophrase excavator or the like. The excavator 12 has a main body 20 suspended and supported in an excavation hole 18.
A pair of rotary drums 10 are rotatably provided at the lower end of the zero.

The rotary drum 10 is rotatably driven by a hydraulic unit (not shown) installed on the ground side, and has a large number of cutter teeth 22 for cutting the ground and the end surface of the preceding panel 14 provided on its peripheral surface.

As shown in detail in FIGS. 2 and 3, the cutter teeth 22 have a blade portion 22a formed on the distal end side,
And a mounting base 22b formed integrally with the blade 22a. The mounting base 22b has a semicircular recess 22c.
Is provided.

A holder 24 on which each of the cutter teeth 22 is mounted is fixed to the outer peripheral surface of the rotary drum 10. The holder 24 is provided with a groove 24a into which the mounting base 22b of the cutter tooth 22 is inserted.

A projection 24b is provided on the inner surface of the groove 24a so as to fit into the recess 22c of the cutter tooth 22.

When cleaning the joint end face 16 of the preceding panel 14, the cutter teeth 22 of the rotary drum 10 are removed, and a cleaning brush 26 shown in FIG.

The cleaning brush 26 shown in FIG. 1 has a rectangular support member 26b on which a wire brush 26a is implanted, and a mounting base 2 integrally formed on the lower surface of the support member 26b.
6c.

The brush of the cleaning brush 26 is not limited to a wire, but may be selected from synthetic resin brushes, a combination thereof, and a brush having abrasive grindstones attached thereto according to the conditions at the site. Can be.

The mounting base 26c is provided with the cutter teeth 2
The second mounting base 22b has the same shape as the second mounting base 22b, has a common mounting structure, and is provided with a semicircular recess 26d.

When the cleaning brush 26 is fitted and fixed to the holder 24, the tip of the wire brush 26a is attached to the blade portion 22 when the cutter teeth 22 are fitted and fixed to the holder 24.
a is located slightly outside the tip position.

In the excavator 12 in which such a cleaning brush 26 is attached to a portion from which the cutter teeth 22 have been removed, as shown in FIG. 1B, the wire brush 26a of the cleaning brush 26 comes into contact with the joint end surface 16. Installed in a state,
The main body 20 is moved up and down while rotating the rotary drum 10.

When such an operation is performed, the preceding panel 14
The mud film adhering to the joining end face 16 of the
After this operation is completed, a steel cage is erected in the excavation hole 18 and concrete is cast to form a succeeding panel.

According to the method for cleaning the joint end surface 16 of the underground continuous wall configured as described above, a dedicated cleaning device is not required, and the joint end surface 1 can be replaced without replacing the machine.
6 becomes possible, and cost reduction can be achieved.

In this embodiment, the cleaning brush 2
6 and the cutter teeth 22 are shared, and the cleaning brush 26 can be fitted and fixed to the portion where the cutter teeth 22 fitted to the rotary drum 10 have been removed. Thus, the joint end face 16 can be cleaned, and the construction efficiency can be improved.

FIG. 5 shows another embodiment of the cleaning brush 26 'used in the cleaning method according to the present invention. The same or corresponding parts as those in the above embodiment are denoted by the same reference numerals and the description thereof will be omitted. A description thereof will be omitted, and only the characteristic points will be described below.

The cleaning brush 26 'shown in FIG. 3 is fitted and fixed to the holder 24 from which the cutter teeth 22 have been removed in the same manner as in the above embodiment.
a ', support member 26b', mounting base 26c 'recess 26
d ′.

The wire brushes 26a 'are implanted in parallel at two ends on both ends of a support member 26b' formed in a substantially inverted concave shape. The mounting base 26c 'is
It is provided so as to protrude downward from the lower surface side of b ′, has the same shape as the mounting base 22b of the cutter teeth 22, and has a common mounting structure.

Even if the cleaning brush 26 'constructed as described above is fitted and fixed to the holder 24 of the rotary drum 10 to clean the joint end face 16, the same operation and effect as in the above embodiment can be obtained.

FIG. 6 shows another embodiment of the method for cleaning the joint end face of the underground continuous wall according to the present invention. The same or corresponding parts as those in the above embodiment are denoted by the same reference numerals. The description will be omitted, and only the characteristic points will be described below.

In the embodiment shown in FIG.
6 "is attached to the lower end side of the main body 20 of the excavator 12. Each cleaning brush 26" is a wire brush 26.
a "and a support member 26b" on which it is implanted.

The wire brush 26a "
b "is planted over the entire length of the support member 26b".
Is approximately the same as the width of the main body 20 of the excavator 12 (the same as the width of the excavation hole 18 and the width of the joint end face 16).

The cleaning brush 26 "thus constructed
The main body 2 so that the tip of the wire brush 26 a ″ projects outward beyond the cutter teeth 22 of the rotating drum 10.
0, it is detachably attached by bolts and nuts.

When the main body 20 of the excavator 12 to which the cleaning brush 26 "is mounted is moved up and down so that the wire brush 26a" is in contact with the joint end face 16, the joint end face 16 is cleaned. Can be.

In the present embodiment, since the cleaning brush 26 "is merely attached to the body of the excavator 12, the cleaning operation can be performed more quickly than when the cutter teeth 22 are replaced with the cleaning brushes 26 and 26 '. Can be.

[0037]

As described above in detail in the embodiments,
ADVANTAGE OF THE INVENTION According to the washing | cleaning method of the joining end surface of the underground continuous wall which concerns on this invention, after excavation is completed, a washing | cleaning operation can be performed using an excavator as it is, without replacing a machine, and while shortening labor and time As a result, the integration of the joints and the high waterproofness are ensured.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a state in which a joining end face of a preceding panel is being cut and a state in which the joining end face is being cleaned by an underground continuous wall method to which a cleaning method according to the present invention is applied.

FIG. 2 is an enlarged bottom view of the excavator of FIG. 1;

FIG. 3 is an explanatory view showing a state in which a cutter tooth is attached to a rotary drum of the excavator in FIG. 1;

FIG. 4 is an explanatory view showing a state in which a cleaning brush is attached to a rotating drum of the excavator in FIG. 1;

FIG. 5 is an explanatory view of an attached state showing another example of the cleaning brush used in the cleaning method of the present invention.

FIG. 6 is an explanatory view showing another embodiment of the cleaning method according to the present invention.

FIG. 7 is an enlarged view of a main part of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Rotary drum 12 Excavator 14 Leading panel 16 Joining end face 18 Drilling hole 20 Main body 22 Cutter teeth 24 Holder 26, 26 ', 26 "Cleaning brush 26a, 26a', 26a" Wire brush 26b, 26b ', 26b "Support member 26c , 26c 'Mounting base

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Tao 2-3 Kandajicho, Chiyoda-ku, Tokyo Tokyo Main Office of Obayashi Corporation (72) Inventor Hitoshi Ito 2-3 Kandajimachi, Chiyoda-ku, Tokyo Co., Ltd. Obayashi Gumi Tokyo Head Office (72) Inventor Masahiro Miyazaki 2-3 Kandajicho, Chiyoda-ku, Tokyo Obayashi Gumi Tokyo Head Office

Claims (3)

[Claims] An excavator provided with a rotary drum rotatably driven at a lower end thereof excavates the ground while cutting a joint end face of a preceding panel, and then forms a succeeding panel on the joint end face of the preceding panel. In the method of constructing an underground continuous wall, after excavating a drilling hole for the trailing panel, a washing brush capable of contacting a joining end face of the preceding panel is attached to the excavator, and the cleaning brush is attached to the joining end face. The excavator is moved up and down in a state where the excavator is brought into contact with the underground wall, and the joint end surface of the underground continuous wall is cleaned. 2. The cleaning brush has a common mounting structure with a cutter tooth fitted to the rotating drum, and is fixedly fitted to a portion where the cutter tooth is removed. Item 4. The method for cleaning a joint end face of an underground continuous wall according to Item 1. 3. The cleaning brush according to claim 1, wherein the cleaning brush is attached to a lower end of an excavator body of the excavator so that a tip of the cleaning brush protrudes outward from a cutter tooth fitted to the rotating drum. Item 4. The method for cleaning a joint end face of an underground continuous wall according to Item 1.