JP5572540B2 - Temporary deadline structure of the final deadline in the impermeable wall and its deadline method - Google Patents

Description

  The present invention is a sea surface waste disposal site and the like, and the final deadline at the impermeable wall that cuts off waste and retained water (hereinafter referred to as retained water) that must be taken so as not to leak into the sea or river. The provisional deadline structure of the part and the deadline method.

  Conventionally, in sea surface waste disposal sites, which are often large-scale, the space in the disposal site that serves as a landfill site for waste is separated by a water-impervious revetment that has a water-impervious structure such as steel sheet piles between the open sea and the water surface in the disposal site Built by closing its boundaries. At the time of construction of the impervious work for retained water, etc., by providing an opening in the impervious work, making the water level inside and outside the same by passing water through the opening, and not causing a difference in water level between inside and outside due to tides, Water safety is not applied to the impervious work under construction, ensuring work safety, workability and quality.

  As shown in FIG. 7 (A), the shut-off work of the impervious construction with the water-impervious steel sheet pile in the retained water is performed by mounting the steel sheet pile 1a with a crawler crane 10 or the like as shown in FIG. As shown in FIG. 7 (A), the steel sheet pile 1a is lifted from a ship or the like and suspended by a wire hammer, etc. while being adjacent to the existing steel sheet pile 1a to ensure high water shielding. Impermeable walls must be constructed by placing them on the bottom of the permeable layer.

  In the deadline of the opening in such a water-impounded revetment, as a conventional example 1, steel pipe gate pillars are placed at predetermined intervals in the openings, and the flap gates are sunk on the sea floor between the gate pillars. A support pile for locking and positioning the sheet cell at the cut-off location as one in which the flap gate is erected at low tide and the opening is closed (see Patent Document 1) or as a conventional example 2. The upper end surface of the sheet cell is placed in a projecting and extended state, and the seat cell is lifted and inserted into the support pile from above the support pile. There is known a method (see Patent Document 2) in which a filling cell is formed by filling and filling the inside with a filling cell to form a filling cell and connecting the filling cell along the cutting point.

Japanese Patent Laid-Open No. 06-49821 Japanese Patent Laid-Open No. 11-222850

  However, it is difficult to apply to the retained water etc. in the deep water level in the deadline method of the retained water etc. of the conventional examples 1 and 2 above, and the work of filling the sheet cell with earth and sand etc. As the flow rate at the opening increases, workability decreases.

  In this way, as the width of the opening of the impermeable wall decreases, fluid force acts on the sheet pile that is not fixed enough due to the difference between the inner and outer tide levels accompanying the fluctuation of the tide level and the rapid flow velocity of the opening. Therefore, there is concern that accidents may occur due to unexpected behavior.

  Moreover, if the flow velocity becomes fast enough to cause movement of the rubble, it will lead to the collapse of the basic rubble, which will reduce the safety. Furthermore, if the sheet pile being placed becomes unstable and the workability is lowered, and it is necessary to increase the temporary work so as to be able to withstand the fluid force, the labor is increased and the workability is lowered.

  Further, even in the joint portion of the steel sheet pile, there is a possibility that a normal state such as deformation or outflow may not be maintained due to fluid force on the water shielding material, leading to deterioration in quality. In addition, it is necessary to work within a limited time of the tide so that the flow velocity of the opening does not increase, and the final closing work may be difficult. The temporary closing structure and the closing method of the final closing part in the impermeable wall according to the present invention have been proposed in order to solve such problems.

  The gist for achieving the object by solving the above-described problem of the temporary closing structure of the final closing portion in the water blocking wall according to the present invention is to use a water blocking sheet pile for the water blocking wall for blocking waste or retained water from the outside sea. A temporary cutoff structure of the final cutoff portion in the water-blocking wall at the time of construction, which is parallel to the water-blocking wall and the short side wall opposed to the water-blocking wall on the outside of the final cutoff portion. A temporary water-impervious wall having a substantially U-shape in plan view composed of a long side wall is constructed, and a water passing part through which water can enter and exit is provided on the opposed short side wall, and the water passing area of the water passing part is adjusted. It is possible.

In addition, the adjustment of the water flow area of the water flow section was performed by placing a hiring pile that is a sheet pile for adjusting the water flow area according to the length of the water flow section in the vertical direction, or driving the water flow section. Pulling out hired stakes and adjusting it;
Moreover, the said water flow part contains that it is formed by the sheet pile laid in the comb-tooth shape.

  The gist for achieving the object by solving the above-described problem of the method for closing the final deadline in the water-impervious wall according to the present invention is to construct a water-impervious wall that shields waste or retained water from the open sea with a water-impregnated sheet pile. In the method of closing the final cut-off portion of the water-impervious wall, a short side wall having a water-permeable portion is arranged outside the final cut-off portion of the water-impervious wall and opposed to the final cut-off portion. Next, by constructing a long side wall parallel to the final cut-off portion of the water shielding wall, a temporary water shielding wall having a substantially U shape in plan view is constructed, and one water passage portion in the short side wall is closed. After that, the other water flow portion in the short side wall is closed at an appropriate tide level, the final cut-off portion of the water shielding wall is closed by placing a sheet pile, and then the temporary water shielding wall is removed. It is to be.

The water flow portion is formed by a sheet pile placed in the shape of a comb tooth;
Furthermore, in order to close the water flow portion, a hiring pile, which is a sheet pile for adjusting the water flow area in accordance with the length of the comb tooth opening in the water flow portion, is used as the comb tooth opening. Or by closing the lower part of the hiring pile to the upper part of the sheet pile sinking under the water surface with a comb-shaped opening and pulling the sheet pile up to the water surface via the hiring pile. Obstruction.

According to the temporary closing structure and the closing method of the final cutoff portion of the impermeable wall according to the present invention, the provisional impermeable wall can be installed without being affected by the difference in internal and external water levels due to tides and the occurrence of the flow velocity of the opening. It is possible to perform the final cut-off work of the final cut-off portion in the water-impervious wall. The quality of the final deadline can be ensured regardless of the scale of the retained water and the tide of the waste disposal site.
Since the water-permeable part of the temporary impermeable wall is provided on the short side of the U-shaped or substantially U-shaped, the direction of the flow velocity is parallel to the normal line of the main impermeable wall, and there is also a corner. Therefore, the stability of the sheet pile for temporary water shielding against the generated flow velocity can be increased. Since the water-permeable portion of the temporary impermeable wall is provided at two locations on the opposing short side wall, the size of the opening per location can be made small, and the temporary closing work is facilitated. Can do.
Since the water flow portion of the temporary impermeable wall is formed in a comb-like shape by a sheet pile, the final few sheets of the water shield sheet pile whose flow velocity at the opening becomes very fast is also affected by the generated flow velocity. It is difficult and work can be done.
By using the hiring pile of the same type as the temporary water-impervious sheet pile, the temporary water-impervious wall's water-passing part is driven to a predetermined depth similar to that of the general part. The water part can be easily secured. Further, the water-permeable portion of the temporary impermeable wall can be provided in a comb-like shape, so that it is difficult to be affected by the generated flow velocity, and the temporary closing can be performed in a short time. In addition, there are many excellent effects such as a margin for closing the opening and the ability to block the water while confirming that the internal water level of retained water is the control water level.

It is a perspective view which shows the outline of the temporary cutoff structure of the final cutoff part in the impermeable wall which concerns on this invention. In the temporary cutoff structure of the final cutoff part in the impermeable wall according to the present invention, a perspective view (A) showing a state in which the water passing part provided on the short side wall is formed in a comb tooth shape, and the passage of the short side wall on one side. It is a perspective view (B) which shows a mode that the water part is obstruct | occluded and the tooth-like water-permeable part of the other comb is obstruct | occluded. It is an explanatory perspective view (A), (B), (C) which shows the procedure of constructing the temporary impermeable wall 3 outside the final cutoff part in the impermeable wall of the present invention. It is explanatory perspective view (A), (B), (C) figure which shows the procedure which obstruct | occludes a water flow part in the temporary water-impervious wall 3 outside the last cutoff part in the water-impervious wall of this invention. The description which shows the procedure which obstruct | occludes the opening part of the main water-blocking wall, and removes the temporary water-blocking wall 3 after constructing the temporary water-blocking wall 3 outside the final cutoff part in the water-blocking wall of the present invention. It is a perspective view for use (A), (B), (C). It is explanatory drawing which shows the operation | work which lifts the steel sheet pile 1a from the carrier with the crawler crane 10, and drives the steel sheet pile 1a suspended with the wire to the submarine ground 9 with the vibro hammer 8. FIG. It is explanatory drawing (A) explaining a mode that the steel sheet pile 1a is driven below the surface of the water with the hiring pile 7, and explanatory drawing (B) which shows a mode that the hiring pile 7 pulls up the steel sheet pile 1a. It is a general | schematic work flow figure which shows the procedure which builds the temporary impermeable wall 3 in the outer side of the final cutoff part in the impermeable wall of the same invention. It is explanatory sectional drawing (A) which shows the mode of construction which builds the impermeable wall concerning a prior art example, and explanatory drawing (B) which shows a mode that the steel sheet pile 1a is connected and driven.

  As shown in FIG. 1A, the temporary cutoff structure of the final cutoff part 2 in the water-impervious wall 1 according to the present invention and its cutoff method are rectangular temporary shields on the open sea side of the opening which is the final cutoff part 2. By constructing the water wall 3 and enclosing the final cutoff part 2, the flow rate of the opening is made gentle, and the final cutoff part 2 is closed. In the landfill disposal area for waste closed by the water shielding wall 1, general waste or managed industrial waste is landfilled.

  As shown in FIG. 1-A and FIG. 1-B, when constructing the impermeable wall 1 for the retained water 6 or the like with a main impermeable sheet pile (hereinafter referred to as a steel sheet pile) 1a, A temporary cutoff structure that surrounds the outside of the opening that is the final cutoff portion 2 provided in the water-impervious wall 1b that constitutes the portion, and the outer side of the final cutoff portion 2, that is, the outside sea side 5, A temporary impermeable wall 3 having a substantially U shape in a plan view is constructed by the short-side walls 3a, 3a arranged opposite to each other perpendicular to the normal and the long-side wall 3d parallel to the normal of the impermeable wall 1b. The opening in the final cutoff part 2 is surrounded by a temporary impermeable wall 3 so as to make the flow rate of the opening gentle.

  The opposed short side wall 3a is formed, for example, by driving a steel sheet pile 1a into the seabed, and water passage portions 3b and 3c through which water can enter and exit are provided in a part of the short side wall 3a. Moreover, the water flow area of the water flow parts 3b and 3c is adjustable. The reason why the water flow portions 3b and 3c are provided on the short side wall 3a is that the wave does not directly hit the short side wall 3a and that the wave is parallel to the opening in the final cutoff portion 2. This is because the flow rate of the seawater due to the difference between the inner and outer water levels of the final cutoff part 2 is relieved because the water enters the temporary impermeable wall 3.

  As shown in FIG. 1-B (B), the water flow area of the water flow parts 3b and 3c is a sheet pile for adjusting the water flow area adjusted to the length of the water flow parts 3b and 3c. It is adjusted by driving a pile (width of about 0.6 m) 7. Alternatively, the hiring pile 7 placed in the water flow sections 3b and 3c is connected to the head of the steel sheet pile driven into the water surface, and the steel sheet pile is pulled up to a required position, and the water flow section 3b, Adjust the water flow area of 3c. This method will be described later in detail. In this way, the temporary impermeable wall 3 is constructed so that the wave does not directly enter the opening in the final cutoff part 2 so that the direction of the wave is parallel to the final cutoff part 2. is there.

  An example of the closing method of the final closing part 2 in the impermeable wall 1 according to the present invention will be described with reference to FIGS. The final cut-off part provided in the main impermeable wall (about 500 m to 800 m) 1b which is a part of the impermeable wall 1 when the impermeable wall 1 for retained water is constructed with a sheet pile (steel sheet pile) 1a 2 (opening is about 20 m). As shown in FIG. 2 (A), perpendicular to the normal line of the main water-impervious wall 1b, outside the opening that is the final cut-off portion 2 of the main water-impervious wall 1b, that is, on the outer sea side 5. A short side wall 3a having a water passage 3b and a short side wall 3a having a water passage 3c are respectively constructed.

  The permanently installed impermeable wall 1b is constructed by placing a steel sheet pile 1a on a seabed ground 9 having an impermeable layer and further introducing a backstone. As shown in FIG. 5A, the construction of the impermeable wall 1 using the steel sheet pile 1a is performed by laying a caisson 12 on the mount 11, constructing a work platform 12a thereon, and then constructing the work platform 12a. The steel sheet pile 1a lifted from the carriage by the crawler crane 10 placed on is hung with a wire, and the steel sheet pile 1a is driven to a predetermined height with a vibro hammer 8 at the placing position. This is step 1 shown in FIG.

  Next, as shown in FIGS. 2A and 2B, the short side walls 3a and 3a are constructed. The water flow portions 3b and 3c in the short side wall 3a are formed by driving the steel sheet pile 1a to a predetermined depth below the sea surface. At that time, since the vibro hammer 8 cannot be put into the sea, an employment pile (same as the steel sheet pile 1a) 7 having a required length as a Yatco is used.

  As shown in FIG. 5-B (A), the hiring pile 7 is attached to the head of the steel sheet pile 1a via the connecting plate 7a, and the steel sheet pile 1a is driven below the sea level. When a predetermined position is reached, the lower bolt or the like of the connecting plate 7a is removed by a diver, the connecting state of the connecting plate 7a and the steel sheet pile 1a is released, and the hiring pile 7 is pulled up together with the vibro hammer 8. Thus, the water flow parts 3b and 3c are formed. This is step 2 in FIG.

  A steel sheet pile 1a is driven on one side of the opening 2 so that the length of the opening 2 is about 20 m. Then throw back stones. These are steps 3 and 4 in FIG. Thereafter, as shown in FIG. 2 (C), by constructing a long side wall 3d parallel to the normal line of the main impermeable wall 1b, a temporary impermeable wall 3 having a substantially U shape in plan view is constructed. . This is step 5 in FIG. A backfill stone is put into the temporary impermeable wall 3. This is step 6 in FIG.

  As shown in FIG. 3 (A), one water passing portion 3 c in the short side wall 3 a is closed by the hiring pile 7. In this operation, the tidal time, the operation time, the generated flow velocity, etc. are confirmed so that the flow velocity of the water passage portion 3b and the opening that is the final cutoff portion 2 does not increase.

  Furthermore, in order to adjust the water level in the retained water 6 or the like, the water passing portion 3b of the other short side wall 3a is shaped like a comb. For this purpose, as shown in FIG. 3 (B), the hiring pile 7 is inserted in a comb shape. If it will be in this state, even if a quick flow velocity arises, it can construct safely.

  Next, the water flow section 3b in the other short side wall 3a is cut off at an appropriate tide level as shown in FIG. 4 (A) while confirming that the internal water level of the retained water 6 is close to the control water level. To do. For this, as shown in FIG. 3 (C), the hiring pile 7 is inserted into the comb-shaped water passage 3b and closed. Alternatively, as shown in FIG. 5-B (B), a steel sheet pile 1a placed under the sea surface is connected to the head of the steel sheet pile 1a with the hiring pile 7 and the hiring pile 7 is connected with a vibro hammer 8. It is also possible to apply vibrations to the surface of the water and gradually close it with the steel sheet pile 1a. This is step 7 in FIG.

  And as shown in FIG.4 (B), the steel sheet pile 1a is driven and the opening part which is the final cutoff part 2 of the said water-impervious wall 1b is permanently closed. This completes the final closing of the impermeable wall 1. Then, a back stone is put around the opening 2. This is steps 8 and 9 in FIG. Thereafter, as shown in FIG. 4C, the temporary impermeable wall 3 is pulled out by the crawler crane 10 with the vibro hammer 8 and removed. This is step 10 in FIG.

  The temporary closing structure and the closing method for the final cutoff part of the impermeable wall according to the present invention can be applied to a coastal part or a river bank with a large tide level difference that may increase the flow velocity of the opening which is the final cutoff part. It is.

1 impermeable wall, 1a impermeable sheet pile (steel sheet pile),
1b Impermeable wall,
2 Final deadline (opening),
3 Temporary impermeable wall, 3a Short side wall,
3b water passage, 3c water passage,
3d long side wall,
4 water flow section,
5 Open sea side,
6 Retained water, etc.
7 Hiring pile, 7a Connecting plate,
8 Vibro hammer,
9 Undersea ground,
10 crawler crane,
11 Mount,
12 Caisson, 12a Work platform.

Claims (6)

When the impermeable wall that shields waste or retained water from the open sea is constructed with a impermeable sheet pile, a temporary closing structure of the final closing portion in the impermeable wall,
On the outside of the final cut-off part, a temporary water shielding wall having a substantially U-shape in plan view composed of a short side wall oppositely arranged perpendicular to the water shielding wall and a long side wall parallel to the water shielding wall is constructed,
On the short side wall of the opposed arrangement, a water passage portion through which water can enter and exit is provided,
The water flow area of the water flow section is adjustable.
A temporary cutoff structure of the final cutoff part in the impermeable wall characterized by Adjustment of the water flow area of the water flow section can be done by placing a hiring pile that is a sheet pile for adjusting the water flow area according to the vertical length of the water flow section, or To be pulled out and adjusted,
The temporary cutoff structure of the final cutoff part in the impermeable wall of Claim 1 characterized by these. The water flow part is formed by a sheet pile placed in the shape of a comb tooth,
The temporary cutoff structure of the final cutoff part in the impermeable wall of Claim 1 or 2 characterized by these. In the method of closing the final cut-off part of the impermeable wall when constructing the impermeable wall that shields waste or retained water from the open sea with the impermeable sheet pile,
On the outside of the final cutoff part of the water-impervious wall, construct a short side wall having a water passage part in an opposing arrangement perpendicular to the final cutoff part,
Next, by constructing a long side wall parallel to the final cut-off portion of the water shielding wall, a temporary water shielding wall having a substantially U shape in plan view is constructed,
Block one water passing portion in the short side wall,
After that, the other water flow portion in the short side wall is closed at an appropriate tide level,
The final shut-off part of the impermeable wall is closed by placing a sheet pile,
Then, removing the temporary impermeable wall,
A method for closing the final cut-off portion in the impermeable wall characterized by the above. The water flow part is formed by a sheet pile placed in the shape of a comb tooth,
The method for closing a final cut-off portion in the impermeable wall according to claim 4. In order to close the water flow portion, a hiring pile, which is a sheet pile for adjusting the water flow area adjusted to the longitudinal length of the comb tooth opening in the water flow portion, is applied to the tooth opening of the comb. Install and block, or connect the lower part of the hiring pile to the upper part of the sheet pile sinking under the water surface with a comb-like opening and pull the sheet pile up to the water surface through the hiring pile and close it about,
The method for closing the final cut-off portion in the impermeable wall according to claim 5.

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