JP3818055B2 - How to collect excavators - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for collecting an excavator, and more particularly to a method for collecting a shield machine or the like in water.
[0002]
[Prior art]
A seawater intake pipe or a water discharge pipe used in a seawater desalination plant or the like can be constructed by a shield method as disclosed in, for example, JP-A-11-63298.
[0003]
When constructing such a pipe line by the shield method, the shield machine used from the start shaft provided in the land part is made to reach the reach shaft provided in the sea and then used for excavation. The excavator is usually buried at the bottom of the sea, or the shield excavator is separated from the pipeline in the reaching shaft where the inside is kept in the air, and then pulled up and collected from the reaching shaft. It was.
[0004]
However, such a shield machine processing method has the following technical problems.
[0005]
[Problems to be solved by the invention]
That is, in the method of burying the shield machine on the sea floor, the steel shell of the shield machine is left in the seabed ground, and the remaining steel shell is oxidized and rust is generated. There is a risk of melting and contaminating the surrounding waters.
[0006]
On the other hand, in the recovery method of pulling up from the reach shaft in the air, the construction of the reach shaft with the tip protruding on the water surface increases the cost as the depth increases, and the interior of the shaft built at the depth is in the atmospheric condition. If this is done, large earth and water pressure will be applied to the shaft, and the dividing work of the shield machine under such conditions will increase the risk.If you try to avoid such a risk, the wall thickness of the shaft will be reduced. This must be increased, resulting in even higher costs.
[0007]
The present invention has been made in view of such conventional problems, and the object of the present invention is to provide a method for recovering an excavator capable of reducing costs and avoiding danger. Is to provide.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides an excavator recovery method for recovering an excavator that has started from a start shaft provided in a land portion and then reaches an arrival shaft provided in water. After the excavator has reached the shaft, with the water contained in the shaft, the pipe is stopped on a cutting pipe having both ends connected between the tip of the constructed pipe and the rear part of the excavator. A water wall is formed, and either or both of the leading end side of the pipe line and the rear side of the excavating machine are closed, and then the cutting pipe is cut off from the pipe line to the excavating machine. Was separated and pulled up and removed.
[0009]
According to the recovery method of the excavator configured in this way, since cutting and separation work are performed in a state where water is accommodated in the reaching shaft, it can be reached as in the case where these operations are performed in the atmosphere. Since the surrounding water pressure is not applied to the shaft, work safety is ensured.
[0010]
In addition, in the case of the present invention, the reach shaft can be constructed in a state where water is accommodated therein, for example, in a state where the upper end is submerged in water, so that the upper end protrudes above the water surface as in the prior art. The cost does not increase as the depth increases, as in the case of constructing the reaching shaft to be deep.
[0011]
The pipeline is constructed by excavation of a shield machine or propulsion of a semi-shield machine, and after removing the machine, the water blocking wall on the tip side is removed, and the seawater used in a seawater desalination plant, etc. It can be used as a water intake pipe or a water discharge pipe, or as a discharge pipe for sewage treated water, rainwater or the like.
[0012]
The reach shaft is connected to a water collecting main pipe laid under the sea bottom, and after removal of the excavator, it can be communicated with the pipe line and closed at the upper end to be used as a water collecting tank. .
[0013]
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. 1 to 10 show an embodiment of a method for recovering an excavator according to the present invention.
[0014]
1 to 6 show the recovery method of this embodiment in the order of steps. In this embodiment, the pipe 10 has a hollow cylindrical propulsion pipe 12 having both ends open and a predetermined length. Then, the end portions are constructed in the seabed ground 14 by sequentially connecting them through the joint portion.
[0015]
In the case of the present embodiment, this pipe line 10 is used as a seawater intake pipe of a seawater desalination plant, and is pushed by pressing a semi-shielded excavator 16 having a steel shell from the rear end side. When a space corresponding to the length of the propulsion pipe 12 is formed on the rear end side of the pipe line 10 along with the propulsion, the propulsion pipe 12 is sequentially connected and installed in the space.
[0016]
In this case, the semi-shielded excavator 16 is started from a start shaft (not shown) provided on the land portion, and the propulsive force is applied by a propulsion jack or the like installed in the start shaft.
[0017]
Moreover, in the case of a present Example, the cutting pipe 18 is installed previously between the semi-shielding machine 16 and the head propulsion pipe 12a installed in the rear part side. The cutting tube 18 is made of a steel plate, and details thereof are shown in FIGS.
[0018]
The cutting tube 18 shown in these drawings includes a hollow cylindrical main body portion 18a having both ends opened, and a plurality of ring-shaped reinforcing steel members 18b fixed to the inner peripheral surface of the main body portion 18a.
And a reinforcing rib 18c.
[0019]
The main body 18 a has substantially the same outer diameter as the steel shell and the propelling pipe 12 of the semi-shielded excavator 16. Three ring-shaped reinforcing steel members 18b are arranged at predetermined intervals along the axial direction on both ends of the opened body portion 18a, and between the pair of axially adjacent ring-shaped reinforcing steel materials 18b, The reinforcing ribs 18c are welded at a predetermined interval in the circumferential direction.
[0020]
Further, a pair of ring-shaped reinforcing steel materials 18b are arranged at a central portion in the axial direction of the main body portion 18a so as to face each other with a predetermined interval. In the case of the present embodiment, between the ring-shaped reinforcing steel materials 18b. In addition, a cutting line C for dividing the semi-shielding machine 16 is formed.
[0021]
The cutting pipe 18 configured in this manner is provided with the ring-shaped reinforcing steel material 18b disposed at both ends of the main body portion 18a, with the annular cushioning material 20 interposed, respectively. They are coupled to the rear side and the tip of the leading propulsion pipe 12a in a watertight state.
[0022]
On the other hand, a reaching shaft 22 is installed in advance at a predetermined position of the seabed ground 14. This reach shaft 22 includes a bottom slab 22a and a side wall 22b standing on the bottom slab 22a and having an upper end opened.
[0023]
In the case of the present embodiment, the upper end of the side wall 22 b of the reaching shaft 22 is at a position lower than the sea level and is submerged in the sea, and seawater is accommodated in the reaching shaft 22. Moreover, when the semi-shielding machine 16 reaches the side wall 22b of the reaching shaft 22, an opening 24 for allowing the semi-shielding machine 16 to enter the reaching shaft 22 penetrates the side wall 22a. Is formed.
[0024]
The opening 24 has a circular shape whose inner diameter is slightly larger than the diameter of the semi-shielding machine 16. Then, when the semi-shielded excavator 16 is close to the reaching shaft 22 as shown in FIG. 1 while connecting the propulsion pipe 12 sequentially to the rear end side and constructing the pipe line 10 connecting the propulsion pipe 12, As shown in FIG. 2, a shield pedestal 26 is installed in the reaching shaft 22. In addition, the proximity | contact state to the reaching shaft 22 of the semi-shielding machine 16 is confirmed by surveying etc. before reaching.
[0025]
This shield cradle 26 is installed on the bottom slab 22a of the reaching shaft 22, and its upper end coincides with the lower end of the opening 24. The total length of the cutting tube 18 is added.
[0026]
Then, as shown in FIG. 2, the semi-shielded excavator 16 that has received the propulsive force from the rear end side passes through the opening 24, enters the reaching shaft 22, and is received on the shield pedestal 26. Then, the water blocking wall 27 is formed in the cutting pipe 18.
[0027]
In the case of the present embodiment, the water blocking wall 27 is formed along the pair of ring-shaped reinforcing steel members 18b of the cutting pipe 18 as shown by phantom lines in FIG. It is composed of rectangular or rectangular steel plates divided into appropriate sizes, and is fixed to the ring-shaped reinforcing steel material 18b by welding or bolting.
[0028]
When such a water blocking wall 27 is formed, the rear side of the semi-shielding machine 16 and the distal end side of the pipe line 10 are both blocked by the water blocking wall 27. In this embodiment, a pair of water blocking walls 27 are formed so as to close both the rear side of the semi-shielding machine 16 and the tip side of the pipe line 10. 27 may close either the rear side of the semi-shielding machine 16 or the distal end side of the pipe line 10.
[0029]
When the formation of the water blocking wall 27 is completed, a cutting line C is formed at the center of the cutting pipe 18, and the semi-shielding machine 16 is separated from the leading propelling pipe 12a of the pipe line 10 as shown in FIG. .
[0030]
When this separation is completed, as shown in FIG. 3, the semi-shielded excavator 16 is lifted and accommodated in the work ship, removed from the reach shaft 22, and the semi-shielded excavator 16 thus recovered and removed is Can be diverted to construction. At the same time, the shield cradle 26 is also dismantled and removed.
[0031]
In the case of the present embodiment, the following procedure is performed in order to use the pipeline 10 constructed in the seabed ground 14 as a seawater intake pipe and allow the reach shaft 22 to function as a seawater catchment.
[0032]
That is, after the semi-shielding machine 16 is removed, first, as shown in FIG. 4, the upper lid 28 is formed on the side wall 22a so as to close it. The upper lid 28 is provided with an inspection port 30 penetrating therethrough.
[0033]
Then, the gap between the opening 24 of the side wall 22b and the propelling pipe 12 where the formation of the upper lid 28 is completed is fixed with a rubber camber, and a two-component rubber is injected around it, and a water-stop seal 32 is provided. Form.
[0034]
As shown in FIG. 4, the formation of the water stop seal 32 is completed. As shown in FIG. 4, the air hose 34 is inserted into the reaching shaft 22 using the inspection port 30, and sludge and the like in the shaft 22 are removed by an air lift. Clean inside.
[0035]
Next, the water blocking wall 27 closing the leading propelling pipe 12a is broken, or an opening / closing valve is arranged on the water blocking wall 27 in advance, and the opening / closing valve is opened to open the inside of the pipe line 10. After the seawater is introduced into the waterstop, the water blocking wall 27 is removed.
[0036]
When the water blocking wall 27 is removed in this way, as shown in FIG. 5, seawater can be introduced into the continuous pipe 10 from the start shaft provided in the ground portion. In this manner, when the removal of the water blocking wall 27 is completed, the inspection port 30 of the upper lid 28 is closed, and a water collecting tank as shown in FIG. 6 is constructed.
[0037]
In the case of the present embodiment, since the reaching shaft 22 of the semi-shielded excavator 16 is used as a seawater collecting basin, the reaching shaft 22 is provided under the sea bottom as shown by a virtual line in FIG. The water collecting main pipe 36 laid in the communication is connected in advance.
[0038]
Now, according to the recovery method of the semi-shielded excavator 16 performed as described above, since the cutting work and the separation / removal work are performed in a state where water is accommodated in the reach shaft 22, these work is performed in the atmosphere. Since the surrounding water pressure is not applied to the reach shaft 22 as in the case of performing the operation, the safety of work is ensured.
[0039]
Further, in this embodiment, the reaching shaft 22 is constructed in a state where water is accommodated therein, that is, in a state where the upper end is submerged in water. Costs do not increase with increasing depth, as in the case of building deep.
[0040]
Furthermore, in the case of the present embodiment, since the semi-shielding machine 16 can be recovered as it is, the shield machine 16 can be diverted, and the cost can be reduced.
[0041]
In addition, since the reaching shaft 22 is constructed in the sea and water is introduced into the interior, the water pressure applied to the shaft 22 can be ignored, so that the wall thickness of the side wall 22b can be reduced. However, the cost can be reduced.
[0042]
Furthermore, in the case of the present embodiment, the semi-shielded excavator 16 is not left in the seabed ground 14, so that the surrounding sea area is not contaminated due to the occurrence of rust.
[0043]
In addition, in the said Example, when constructing the seawater intake pipe line 10 by the propulsion method using the semi-shielded excavator 16, the recovery method to which the present invention was applied was illustrated. For example, the present invention can be applied to a case where a pipeline is constructed using a normal shield machine and a water intake segment.
[0044]
Moreover, when forming a pipe line using such a shield machine and a water intake segment, the cutting pipe 18 is previously installed between the semi-shield machine 16 and the propulsion pipe 12 as in the above embodiment. There is no need to do this. For example, this may be installed immediately before the shield machine reaches the reaching shaft.
[0045]
Furthermore, in the said Example, although the case where this invention was applied to the pipe line 10 used for the collection of seawater was illustrated, application of this invention is not limited to this, For example, sewer treated water or It can also be applied to discharge pipes such as rainwater.
[0046]
【The invention's effect】
As described above in detail, according to the excavator recovery method according to the present invention, it is possible to reduce the cost while avoiding the danger.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of an initial process showing an embodiment of a method for collecting an excavator according to the present invention.
2 is an explanatory diagram of a process performed subsequent to FIG. 1. FIG.
3 is an explanatory diagram of a process performed subsequent to FIG. 2. FIG.
4 is an explanatory diagram of a process performed subsequent to FIG. 3. FIG.
FIG. 5 is an explanatory diagram of a process performed subsequent to FIG. 4;
6 is an explanatory diagram of a process performed subsequent to FIG. 5. FIG.
FIG. 7 is an enlarged view of a main part of FIG.
8 is a view taken along line AA in FIG.
9 is a view taken along the line BB in FIG.
FIG. 10 is an explanatory diagram when cutting the cutting pipe of FIG. 7 and separating the excavator.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Pipe line 12 Propulsion pipe 12a Leading propulsion pipe 14 Submarine ground 16 Semi shield machine 18 Cutting pipe 20 Cushion material 22 Reaching shaft 27 Reservation wall

Claims (3)

In the excavator recovery method for recovering the excavator started from the start shaft provided in the land, after reaching the arrival shaft provided in the water,
In a state where water is accommodated in the reach shaft,
After reaching the excavator in the reach shaft, a water stop wall is formed on a cutting pipe having both ends connected between the tip of the constructed pipe and the rear part of the excavator, Either one or both of the front end side or the rear side of the excavator is closed,
Thereafter, the cutting pipe is cut, the excavating machine is separated from the pipe, and then lifted and removed. The pipeline is constructed by excavation of a shield machine or propulsion of a semi-shield machine, and after removing the machine, the water blocking wall on the tip side is removed, and the seawater used in a seawater desalination plant, etc. 2. The excavator recovery method according to claim 1, wherein the excavator is used as a water intake pipe or a water discharge pipe, or a discharge pipe for sewerage treatment water, rainwater, or the like. The reach shaft is connected to a water collecting main pipe laid under the sea bottom, and after removal of the excavator, is connected to the pipe line and is used as a water collecting rod with its upper end closed. The method for recovering an excavator according to claim 2.

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