JP4025918B2 - Rust prevention treatment method for remaining shield machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rust preventive treatment method for a shield machine left in the ground.
[0002]
[Prior art]
In the current shield work, the steel skin plate, which is the outer shell of the shield machine, is often left in the ground after the tunnel has penetrated.
[0003]
However, when the skin plate of such a shield machine is left in the ground, there are technical problems described below.
[0004]
[Problems to be solved by the invention]
In other words, if the steel skin plate is left in the ground, the skin plate undergoes an oxidation reaction to generate rust, contaminating the groundwater, and the rust generation reduces the proof stress of the skin plate itself, thereby stabilizing the tunnel. There is also a problem with sex.
[0005]
Such a problem of the rust of the remaining shield machine occurs more conspicuously in the construction of the intake tunnel proposed by the present applicant in Japanese Patent Application No. 9-218492.
[0006]
That is, the invention according to this application is a technical idea of replacing the intake pipe for cooling water used in a seawater desalination facility or a power plant with a tunnel constructed by a shield method.
[0007]
Such a water intake tunnel is normally constructed near the coast, and the shield machine used for the construction of the tunnel is left on the seabed at the tip side of the water intake tunnel. Rust is likely to occur. If rust is generated, the seawater taken in will be contaminated, and the tunnel will be unstable.
[0008]
The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a method capable of preventing the occurrence of rust of a shield machine left in the ground. There is.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is to inject a cement-based solidified material into the outer periphery of the skin plate of the remaining shield machine left in the ground to form a ground impermeable layer on the outer periphery of the skin plate. The concrete was cast inside the skin plate to form a concrete solidified layer.
According to the rust preventive treatment method of the remaining shield machine configured as described above, a ground impermeable layer is formed on the outer periphery of the skin plate which is an outer shell of the shield machine left in the ground, and a concrete solidified layer is formed inside. Therefore, the supply of moisture and oxygen to the skin plate is blocked, and rusting from the surface of the skin plate can be prevented.
The solidifying material can be injected while rotating a copy cutter that protrudes outward from the cutter from at least a front position corresponding to the length of the skin plate of the remaining shield portion of the remaining shield machine.
According to this configuration, by injecting the solidified material while rotating the copy cutter, the solidified material and the surrounding natural ground are stirred and mixed, and when the remaining shield machine is advanced to the place to be left behind, A ground impermeable layer can be formed on the outer periphery.
The residual shield machine is a shield machine for constructing a water intake tunnel, and the placing of the concrete is a steel partition wall that closes the inside of the skin plate after removing the rotary drive mechanism and the propulsion mechanism of the residual shield machine Can be carried out.
According to this configuration, it is suitable when the remaining shield machine is buried.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings. FIG. 1 to FIG. 6 show an embodiment of a rust preventive treatment method for a residual shield machine according to the present invention.
[0011]
The rust prevention method shown in the figure exemplifies the case where the present invention is applied to the shield machine 10 used in the construction method of the water tunnel, and is provided in the vicinity of the coast when constructing the water intake tunnel. The shield machine 10 is started from the start pit toward the coast.
[0012]
The shield machine 10 used for construction of a water intake tunnel has a cylindrical skin plate 12 as in the machine used for a normal shield method.
[0013]
The skin plate 12 is an outer shell made of steel, and a cutter 14 for earth and sand excavation is rotatably disposed on the tip side thereof. The cutter 14 is of a spoke or face plate type, and is provided with a copy cutter 15 capable of excavating a cross section larger than the cross section of the skin plate 12 by expanding and contracting a part thereof.
[0014]
Although not shown, the skin plate 12 is provided with a rotary drive mechanism for the cutter 14, a propulsion mechanism such as a jack for excavation of the shield machine 10, and a soil excavation mechanism for excavated sediment such as a screw conveyor. ing.
[0015]
When the cutter 14 is driven to rotate and the ground 16 is excavated for a predetermined length, the water intake segments 20 are sequentially assembled in an annular shape on the rear end side of the skin plate 12, whereby an intake tunnel for introducing seawater into a seawater desalination facility or the like. Is built.
[0016]
An example of the water intake segment 20 used in this case is shown in FIG. The water intake segment 20 shown in the figure is similar to a segment used in a normal shield method, and is a tubular body having a predetermined length divided into a plurality along the circumferential direction. Adjacent parts can be assembled into a ring by connecting bolts and pins together.
[0017]
The water intake segment 20 includes a segment main body 20a, a porous concrete portion 20b, a water intake hole 20c, and a lid 20d. The segment body 20a is made of a cast iron plate or a steel plate, and a pair of connecting flanges 200a are provided at both ends in the longitudinal direction, and two concave portions 201a recessed inward are formed on the outer peripheral surface between the flanges 200a. Is formed.
[0018]
The porous concrete portion 20b is a porous body having water permeability, and is filled and solidified in the concave portion 201a. The water intake hole 20c is formed through the flat bottom surface of the two concave portions 201a.
[0019]
The lid 20d is detachably screwed and fixed to the water intake hole 20c, closes the water intake hole 20c, and when the lid 20d is removed, the water intake hole 20c is connected to the outside via the porous concrete portion 20b. It can be communicated and seawater can be taken in.
[0020]
When the intake tunnel is constructed while annularly assembling the intake segment 20 and the shield machine 10 reaches a position separated by a predetermined distance L from the planned remaining location A in the ground 16 as shown in FIG. Instead, the normal segment 22 having no water permeability is used to construct the tunnel.
[0021]
The predetermined distance L in this case is set to a distance slightly longer than the entire length of the skin plate 12 of the shield machine 10. As shown in FIG. 2, the copy cutter 15 is extended between this position and the planned location A, and a cross section larger than the cross section of the skin plate 12 is excavated. Simultaneously with this excavation, the copy cutter 15 Inject solidified material such as cement milk from the tip.
[0022]
FIG. 6 shows an example of the ordinary segment 22 used at this time. The ordinary segment 22 shown in the figure has a segment main body 22a formed of reinforced concrete, and a plurality of segment main bodies 22a are connected in the circumferential direction and assembled into a cylindrical shape, and the assembled cylindrical body in the longitudinal direction. It is the structure which connects sequentially.
[0023]
Each segment body 22a is provided with a backfilling injection hole 22b penetrating in the thickness direction, and this backfilling injection hole 22b is closed by a detachable plug packing 22c.
[0024]
The segment main body 22a is connected in the axial and circumferential directions via a bolt nut 22e with a packing sandwiched in a joint box 22d provided at the end in the longitudinal axis direction, and a seal between the end faces of the segment main body 22a. A material 22f and a caulking material 22g are interposed.
In this case, the normal segment 22 has about 10 or more rings, but the number ring on the part A to be left is connected to the segment main body 22a through the backfilling material 24 such as mortar and cement milk via the backfill injection hole 22b. Inject between the natural ground.
[0025]
As described above, the copy cutter 15 is extended to excavate a cross section larger than the cross section of the skin plate 12, and at the same time as this excavation, the solidified material such as cement milk is poured from the front end of the copy cutter 15 and is advanced. When the shield machine 10 reaches the location A to be left, as shown in FIG. 3, the outer peripheral side of the skin plate 12 covers the entire length thereof, and a mixture region of excavated sediment and solidified material having a predetermined thickness is formed. When this mixture region is formed and solidified, the ground impermeable layer 26 is formed.
[0026]
In this ground impermeable layer 26, in the case of the present embodiment, the impermeable layer formed by solidifying the injected backfill material 24 is formed in a continuous state. In addition, when forming the ground impermeable layer 26 on the outer periphery of the skin plate 12, for example, a through hole may be provided in the skin plate 12, and the solidification material may be additionally injected from the through hole.
[0027]
While the ground impermeable layer 26 is being formed, a rotary drive mechanism for the cutter 14 in the skin plate 12, a propulsion mechanism such as a jack for excavation of the shield machine 10, and a soil removal mechanism for excavated soil such as a screw conveyor are provided. It removes and, as shown in FIG. 4, the steel partition 28 is installed and concrete placement is performed.
[0028]
In this case, the partition wall 28 is installed in the vicinity of the rear end side so as to close the inside of the skin plate 12, and the surface is subjected to rust prevention treatment by applying an epoxy resin coating or the like.
[0029]
Then, when the concrete placed in the skin plate 12 defined by the partition walls is solidified, the skin plate 12 is filled with the concrete solidified layer 30, thereby completing the rust prevention treatment of the remaining shield machine 10. .
[0030]
Now, according to the rust prevention method of the remaining shield machine 10 performed as described above, the ground impermeable layer 26 is formed on the outer periphery of the skin plate 12 which is the outer shell of the shield machine 10 left in the ground. In addition, since the concrete solidified layer 30 is formed inside, the supply of moisture and oxygen to the skin plate 12 is blocked, and rusting from the surface of the skin plate 12 can be prevented.
[0031]
Further, in the case of the present embodiment, the solidifying material is a copy cutter 15 that protrudes outward from the cutter 14 from a front position corresponding to the length of the skin plate 12 at the planned leaving location A of the remaining shield machine 10. Therefore, when the remaining shield machine 10 is dug to the place A to be left, the ground impermeable layer 26 can be formed on the outer periphery of the skin plate 12 at that time.
[0032]
Further, in the case of the present embodiment, the remaining shield machine 10 is a shield machine for constructing a water intake tunnel, and the concrete placement is performed after removing the rotational drive mechanism and the propulsion mechanism of the remaining shield machine 10 and then the skin plate. Since this is performed by forming the partition wall 28 that closes the inside of the housing 12, it is suitable when the remaining shield machine 10 is buried.
[0033]
In the above-described embodiment, the case where the rust prevention treatment method of the present invention is applied to the shield machine 10 for constructing a water tunnel is illustrated, but the implementation of the present invention is not limited to this, and a normal shield is used. It can also be applied to the remaining shield machine used in the construction method.
[0034]
In this case, the remaining shield machine is generally left in the vicinity of the reaching shaft, but in such a remaining shield machine, the inside of the skin plate cannot be closed by placing concrete, for example, An annular formwork may be installed in the skin plate, concrete may be cast, and then the formwork may be removed to form a concrete solidified layer inside the skin plate.
[0035]
Further, instead of the mold, a normal segment may be assembled in the skin plate, and concrete may be placed between the segment and the skin plate.
[0036]
【The invention's effect】
As described above in detail in the embodiment, according to the rust preventive treatment method for the remaining shield machine according to the present invention, it is possible to prevent the rust of the shield machine left in the ground.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of the first fixing of a rust prevention treatment method for a remaining shield machine according to the present invention.
2 is an explanatory diagram of a process performed subsequent to the process of FIG. 1. FIG.
FIG. 3 is an explanatory diagram of a process performed subsequent to the process of FIG. 2;
4 is an explanatory diagram of a process performed subsequent to the process of FIG. 3. FIG.
5 is a perspective view and a cross-sectional view of the main part of an assembled state of a water intake segment used in a tunnel constructed by the shield machine shown in FIG. 1. FIG.
6 is a cross-sectional explanatory view of a normal segment used in a tunnel constructed by the shield machine shown in FIG. 1. FIG.
[Brief description of symbols]
DESCRIPTION OF SYMBOLS 10 Shield machine 12 Skin plate 14 Cutter 15 Copy cutter 16 Ground 20 Water intake segment 22 Normal segment 24 Backfill material 26 Ground impermeable layer 28 Bulkhead 30 Concrete solidified layer

Claims (3)

In the rust prevention treatment method of the remaining shield machine left in the ground,
A cement-based solidified material is injected into the outer periphery of the skin plate of the residual shield machine to form a ground impermeable layer on the outer periphery of the skin plate, and concrete is cast into the skin plate to form a concrete solidified layer. An anti-rust treatment method for a residual shield machine, characterized in that it is formed. The solidifying material is injected while rotating a copy cutter that protrudes outward from the cutter from at least a front position corresponding to the length of the skin plate at a planned remaining position of the remaining shield machine. The rust-proofing method of the remaining shield machine of Claim 1. The remaining shield machine is a intake tunnel construction shield machine,
The concrete placing is performed by forming a steel partition wall that closes the inside of the skin plate after removing the rotary drive mechanism, the propulsion mechanism, and the soil removal mechanism of the residual shield machine. The rust prevention processing method of the remaining shield machine of 1 or 2.

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