JP2008307433A - Construction method of partition revetment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily close sections for landfill of waste by providing an opening allowing easy passing of a work barge at a part of the section demarcated by a water shielding wall when constructing the sections by demarcating a sea area, and using caissons at the last construction stage of walls. <P>SOLUTION: When constructing a waste disposal site by erecting a dike-like structure for surrounding, only low caissons are erected from the submarine foundation at a part of a revetment body 10 using a structure like caissons, and the top opening 6 is provided. After the work barge has left finishing the work by the work barge within a section, a low caisson 15 is installed at the opening, water-shielding is performed between the caissons on both sides, to complete an integrated water shielding wall. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a construction method for constructing a partition revetment in a coastal part or in a bay, dividing a sea area having a predetermined area, and constructing a disposal site by dumping waste or the like inside the partition, and in particular, a partition revetment. It is related with the construction method which can easily perform the construction which cuts off the opening part of a partition revetment after taking out the ship for construction which continues construction to the inside inside of the outside of a division.

  In general, in order to landfill waste such as rubble and earth and sand that are discharged from civil engineering construction sites, and non-burnable garbage, a waste accumulation site is constructed in a predetermined place in the mountains. Landfill disposal of such wastes is performed. Also, in places where a suitable place cannot be obtained in the mountainous area, or in a city facing a relatively quiet bay such as the coastal area of Tokyo Bay, a dumping place surrounded by a partition revetment with a relatively shallow sea area selected. Provided. And as mentioned above, by constructing a large landfill near the coast, etc., there is no need to transport waste to remote areas, and the secondary effect is the creation of new land. Will be able to do.

  As mentioned above, in landfills that reclaim waste to be built in the sea, prefabricated structures such as concrete, steel, or large hybrid caissons are placed on the rubbing foundation built on the seabed ground. The bank is built in a row. In the landfill disposal site, which is surrounded by a partition revetment, both the foundation and the structure and the connection part of each structure are water-impervious, and if necessary, the water permeability of the seabed ground is eliminated. Processing and so on. And, in the state where the waste was deposited inside the landfill disposal site, the contaminated retained water etc. in contact with the waste inside the disposal site was prevented from flowing out to the surrounding sea area. Water can be retained in the area, and after detoxifying treatment, water is discharged.

In the landfill disposal site, for example, as shown in Japanese Patent Application Laid-Open No. 2003-7401, it is known to constitute the partition revetment, and as a structure for closing off the sea area, a hybrid caisson or the like is used. It is set up in combination. In the case of using the conventional construction method, the cut-off work can be easily performed by using a caisson constructed at a height corresponding to the water depth even in a relatively deep sea area. In the partition revetment, it is required for the bottom and both sides of each caisson standing in a row and all of the submarine ground with respect to the revetment main body constructed so as to surround the landfill disposal site. Water-impervious treatment is performed on the place where the waste is deposited, so that the waste accumulated in the disposal site can be safely stored (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 2003-7401

  However, when constructing the landfill disposal site by building a partition revetment and building it, the work to build the partition revetment is performed at sea, so it is possible to use various work vessels in combination. It is required to work efficiently. In addition, by constructing a rubble foundation of a predetermined height on the seabed ground and arranging caisons side by side on top of it, a section of partition revetment is provided, but even after the section is surrounded by partition revetment, It is necessary to continue the construction using the work boat inside the enclosure by the partition revetment. Therefore, in order to continue the work efficiently, it is required to be able to perform the construction inside the partition using a relatively large work boat even after the partition revetment is constructed.

  To that end, by constructing a breakwater with a caisson standing up, the construction of a water-blocking layer inside the compartment and other auxiliary work will continue inside the enclosure even after the enclosure work has been completed. Make it possible. After the work inside the revetment is completed, in order to take the work boat out of the section, when using a small work ship, lift it with a crane and take it out of the section of the partition revetment, etc. It is necessary to do extra work. Therefore, even when trying to work in a section after building a partition revetment, it may not be possible to rely on a large work boat, and it may be necessary to perform an inefficient work.

  In the present invention, when building a partition revetment such as a waste sea surface disposal site, an opening having a size through which a work ship can finally pass is provided, and when closing the opening, a caisson or the like that closes the opening is provided. The object is to provide a new construction method that can easily complete a partition revetment simply by placing and positioning a structure.

The present invention relates to a waste disposal site in which a partition revetment is constructed so as to surround a predetermined area in a sea area, and waste is deposited inside the partition revetment.
When the partition revetment is constructed, the partition revetment having water-imperviousness is constructed between the structures to be installed as the main body of the revetment, leaving only the last part to be closed, The opening provided to be closed at the end satisfies the condition of the tidal current in the part where the work ship working inside the area surrounded by the revetment can pass, or in the sea area inside and outside the deadline. In the position, build the lower structure on the rubble foundation corresponding to the structure for the deadline, corresponding to the work in the section cut off at the revetment,
When the opening of the partition revetment becomes unnecessary, the lower structure below the opening and the newly installed upper structure are integrated to provide a function as a partition revetment in order to close the opening. It is characterized by that.

The invention of claim 2 enables the passage of a ship for work in the opening provided to be closed at the end when the partition revetment is constructed,
In the portion corresponding to the opening, the rubble foundation and the lower structure are set in consideration of any conditions such as water depth at low tide or tidal current speed and the passage of the vessel for the work. It is characterized by doing.

The invention according to claim 3 is the above-mentioned partition revetment.
Between the structure of the revetment main body located on both sides of the opening, a water shielding material that exhibits water shielding is arranged,
The additional structure is installed, and the water shielding material is pressure-contacted to perform water shielding treatment, and the inside and outside of the partition revetment are kept watertight.

The invention of claim 4 is a structure of a lower structure in which a structure such as a caisson to be installed later in the opening is built in advance on the rubble foundation of the opening for the cut-off at the opening. When stacking on top,
Between the lower surface of the upper structure to be installed for the deadline processing and the upper surface of the lower structure that has been constructed in advance on the rubble foundation of the opening, a water shielding material is interposed, Using the weight of the upper structure to be placed last, the water shielding material is pressed and sandwiched to form a watertight connection between the upper and lower structures positioned in the opening. To do.

In order to form a watertight connection between the upper and lower structures positioned in the opening,
A water shielding layer having a predetermined height is constructed on the inner side surface of the upper and lower structure connecting portions to be combined, and the water shielding layer is fixedly held on the inner surface portion of the structure and positioned in the opening. It is characterized by a watertight connection between the upper and lower structures.
The invention of claim 6 provides a formwork member corresponding to a water shielding layer provided on the inner surface of the connecting portion of the structure to be placed one above the other, and a water shielding material in the formwork. And is configured as a water shielding layer integrated with the mold.

  According to the seventh aspect of the present invention, as the upper and lower structures used for the cut-off at the opening, the upper structure installed at the upper part is smaller in thickness than the lower structure provided at the lower part of the opening. It is characterized in that means for sealing with a water shielding material is used for the connection part of the upper and lower structures.

In the invention of claim 8, the structure to be installed on the rubble foundation at the opening has a cross section similar to the body structure of the revetment on both sides of the structure,
It is characterized in that an opening is provided in the center of the structure, and that the opening is dealt with later.

The invention according to claim 9 is a vertical connection between the upper structure used for the cut-off at the opening and the main body structure built in advance on both sides of the opening, or between the upper structures. In the part, a mold member corresponding to the water-impervious layer provided on the inner surface of the connection part is provided, and a water-impervious material is injected into the mold and configured as a water-impervious layer integrated with the mold. It is characterized by that.
According to a tenth aspect of the present invention, in the connecting portion, a connecting means in which convex ridges and concave grooves formed vertically are opposed to each other, and a water shielding material is sandwiched between the concave and convex portions of the vertical connecting portion. It is characterized by using a water structure.

  The invention of claim 11 is an asphalt-type water-insulating material, a concrete-type water-insulating material, a cement-type water-insulating material, a chemical-type water-insulating material, and a soil-type water-insulating material as the water-insulating material provided at the connecting portion of the structure. Any one of them is used alone or in combination with a suitable water shielding material.

  As mentioned above, an opening that allows a work ship to pass through is provided in the revetment that divides the landfill disposal site, and when there is no work by the work ship in the section, opening the work ship is easy after opening the work ship. Can be sealed. And most part of the work process at the time of constructing the said water-impervious revetment can be performed using the work ship of the magnitude | size which can pass an opening, and the work efficiency of revetment construction can be maintained favorable. Furthermore, the opening used during the construction can be easily prepared using the depth of the inundation line of the work ship and the water level and wave height data at high tide. Work can be simplified. Note that the opening provided in the revetment main body must have the ability to safely guide the fast tide flowing inside and outside the partition due to the difference in tide level at high tide and low tide. The structure disposed at the lower part of the frame is configured so as not to disturb the tidal current.

  When constructing a general waste sea surface disposal site, the sea area in the port is partitioned by a partition revetment, and the inside of the partition is used as a waste disposal site to dump building waste, incombustible waste, incinerated ash, etc. The location is set. Then, on the surface of the disposal site where the waste is deposited, a soil layer is provided with a predetermined thickness so as to cover the deposited layer, and a process of greening by planting trees and grass is performed. It is common to use it as a park etc. When constructing the waste disposal site, in the same way as when constructing the harbor breakwater first, the ground is strengthened so that it can withstand the weight of the structure such as the upper partition revetment. After constructing a rubble foundation at a predetermined height, a structure such as a caisson is erected on the foundation and constructed as a partition revetment for partitioning a waste disposal site.

  The present invention will be described in accordance with the illustrated example. As shown in FIG. 1, the waste disposal site 2 constructs a partition revetment 5 so as to surround a part of the planned sea area 1, and the partition revetment 5 The interior surrounded by is used as the waste disposal site 2. In many cases, the partition revetment 5 is constructed by partitioning a sheet pile wall on which sheet piles are placed. However, in the example described below, caisson is constructed in a single row and is relatively wide (thickness). This is explained in the case where it is configured as a retaining wall. In the partition revetment 5, in order to divide the waste disposal site 2, a large number of caissons are erected in a line, and the walls constructed by the caissons have a water-impervious property that prevents water from flowing in and out. It is required to perform processing. For this purpose, the connection part of each caisson is treated with a water-impervious material, etc., and built as a wall that exhibits water-imperviousness, and the surface of the seabed and rubble foundation that supports the wall of the caisson, Processing to prevent water from passing.

  In the example of the waste disposal site 2 described in FIG. 1, the waste disposal site 2 is a final stage where a caisson or the like is arranged to construct a division until the role of the work ship is completed in the division. The opening 6 is left in a part of 2 to allow the passage of the ship. The width or the like of the opening 6 corresponds to, for example, the width of one standard caisson for constructing the revetment, or specially or separately according to the width of the opening 6. If the configured deadline caisson is prepared, the deadline operation can be easily performed later. Alternatively, the size of the opening is configured to correspond to the width and depth that allow the work boat to pass, and the deadening caisson or block is prepared in accordance with the size of the opening. Yes.

  And when the work inside the enclosure surrounded by the revetment is finished and it is no longer necessary to use the opening, it is surrounded by the revetment by using a method of installing and closing a caisson in the opening. The inside of the area is partitioned from the open sea so that water can be easily sealed. Moreover, in the Example mentioned later of this invention, with respect to the large caisson which comprises a revetment main body, two caisson with a low height is piled up in an opening part, and the same height as the main body caisson of the both sides of the opening part. The explanation is made on the assumption that the two caissons are constructed in a stacked manner, and the two caisson constructed by overlapping are called a lower structure and an upper structure.

  In other words, when connecting waste landfill disposal sites, even after building a revetment, the construction of a relatively large crane ship or a transport ship carrying materials, etc. It is necessary to use many types. For that reason, the partition revetment 5 constructed so as to partition the disposal site is left with an opening for allowing passage of the ship for continuing work to the end in the section to allow passage after the work is completed. Yes. And after completion | finish of work, it is calculated | required to make it cope with later work, such as constructing a partition member last and leaving the room which plugs up the said opening part.

The opening provided in the waste disposal site can be configured as described in FIGS. 2 to 4, and the opening 6 is provided at one place in the row of the partition revetment 5 or at an arbitrary place. . As shown in the plan view of FIG. 2 and the front view of FIG. 3, the opening is prepared by separately configuring the upper structure 15 as an additional caisson, and the caisson or the like is used as the opening. An opening having a predetermined width and height is left so as to be inserted.
In the following description, the additional caisson will be referred to as an upper structure. However, in order to close the opening, for example, a lower structure provided in advance integrally with the partition revetment main body 10 at the lower part of the opening. The upper structure can be combined and installed on the body 12. In the opening 6, if the space from the upper surface of the lower structure to the sea level at high tide is configured with a margin of height H1 so that a crane ship or the like can easily enter and exit, it is partitioned by a partition revetment. Can handle the internal work done.

  In the revetment main body 10 of the partition revetment, as shown in FIG. 4, the height H of the caisson is higher than the sea level (HWL) at the time of high tide so that it becomes the height of the sea bottom or the top surface of the rubble foundation 7. Set to On the other hand, the upper structure 15 for closing the opening 6 later is configured to have a size (height) that matches the height of the revetment main body 10. And, for example, the upper structure to be additionally constructed corresponds to the width of one caisson constituting the revetment main body, or is constructed so as to allow the work ship to pass through, so that the opening is finally opened. In order to close the space, one small caisson may be installed as the upper structure 15.

  Note that the height of the lower structure constituting the opening is required to be configured so that the ocean current flowing through the opening can be guided in a stable state due to, for example, the occurrence of a tide level difference during tidal tide. It is done. And it is sufficient to make it possible for a ship working in the section surrounded by the breakwater to pass easily at high tide. When the opening of the breakwater is closed, the water barrier layers 17 and 18 are constructed by sandwiching asphalt mastic and other water barrier materials between the lower surface and both side surfaces of the upper structure. It can also guarantee the water barrier of the whole revetment. Further, the upper structure 21 is provided on the upper structure 15 in the same manner as the caissons 11 and 11a on both sides of the upper structure 15, and the upper structure 15 is used integrally with the upper structure or attached later. You can also.

In FIG. 4 for explaining the partition revetment 5, in the state where the upper structure 15 is placed on the upper portion of the lower structure 12 and combined, one caisson located on both sides thereof and the cross-sectional shape are the same. It is trying to become. In the partition revetment 5, a rubble foundation 7 is constructed on the seabed ground 3 at a predetermined height, and a caisson is placed on the rubble foundation 7. In the revetment, a water shielding layer 8 is provided over a predetermined range of the seabed ground 3 and the foundation surface and the side surface of the caisson, and the waste disposal site main body and the seabed ground are all integrated as a water shielding layer. ing.
In the example shown in FIG. 4, when the partition revetment 5 is first constructed to surround the waste disposal site, a short caisson is provided at the portion corresponding to the opening 6 in the lower structure. 12 is provided. Then, the upper structure 15 is positioned and placed on the lower structure 12 so as to have the same shape as the caissons on both sides thereof. In other words, the lower structure 12 and the upper structure 15 are explained by constituting the main body of the partition revetment using a caisson or other structure having an integrated shape.

  The main body caisson 11 constituting the partition revetment has a conventionally known arbitrary structure in addition to a caisson made of concrete or a so-called hybrid caisson in which a concrete layer is provided on the surface of a steel casing. A caisson or the like as a body can be used, but in the present invention, the type and structure of the caisson are not particularly limited. In the example shown in FIG. 4, when the opening is closed, a water shielding material is disposed on the upper surface of the lower structure so as to have a predetermined thickness and width, and then the upper structure 15 is positioned. The water shielding layer 17 can be constructed by sandwiching the water shielding treatment layer 17 in a state where the water shielding material is pressed and sandwiched so as not to leave a gap by using the weight of the upper structure 15 while being placed. To.

  The examples shown in FIGS. 5 and 6 show an example in which the water shielding layer 17 is provided. In the example shown in FIG. 5, the lower structure is a hollow box having an opening on the upper surface. In some cases, the inside of the box is filled with rubble, stones, etc., and then concrete 13 is placed so as to leave a margin at the top, and a lid is installed to close the box. Then, when closing the opening of the revetment, when a layer of a water shielding material such as asphalt mastic is provided in the recess on the upper surface of the lower structure 12, and the upper structure 15 is placed thereon, the water shielding material These layers are pressed and sandwiched between the upper and lower structures, and are deformed so as not to form a gap through which water passes.

In the example shown in FIG. 6, an uneven pattern is formed on the upper surface of the lower structure 12, and the upper structure 15 is placed in a state where the recessed portion is filled with a water shielding material. Construct an integrated connection with the material in between. When the opening is closed, the pattern of the water shielding layer formed on the connection surface thereof can be configured in an arbitrary shape, and in the pattern, the concave portion 12a and the protrusion 15a are used as the engaging portion. By providing, it is possible to easily perform the work of positioning the upper and lower structures, and to make the water shielding layer more effective.
Then, a mat made of a water shielding material such as asphalt mastic or an asphalt mat formed to have a predetermined thickness is positioned and set on the lower structure 12, and then the upper structure 15 is mounted. By setting it so that it is placed and pressed, it is possible to easily construct a revetment having an integrated water barrier.

  In addition, as shown in the examples shown in FIGS. 7 and 8, it is only necessary to form a water-shielding material layer pattern so that a water-shielding layer at the connecting portion of the upper and lower structures can be easily constructed. . For example, by appropriately setting the shapes of the caissons 11 and 11a on both sides of the opening, it is possible to maintain a good water stopping effect even if the amount of the water shielding material is reduced. In addition, even when the upper and lower structures are bonded to each other with a large bonding area, it is possible to select a pattern that provides a condition for ensuring water shielding without sealing the entire large area, and to reduce the required narrow portion. It is also possible to construct a water shielding layer by providing only a water shielding material.

  FIG. 9 shows an example of a caisson having a structure different from that of each of the above embodiments. In this example, a caisson having a hollow part inside a wall is used. Then, as shown in the figure, after the base caisson is submerged in the revetment construction position, the hollow portion is filled with rubble and concrete pieces and installed in advance as the lower structure 12, and the upper part is opened. The part is located. After that, when the upper structure 15 having the same cross-sectional configuration is installed and the opening is closed at the final stage of the construction work of the partition revetment, the opening on the upper surface of the lower structure 12 previously installed is closed. A concrete lid is constructed on the lid, a water shielding material mat or the like is disposed on the top surface of the lid, and the upper structure 15 is placed thereon, and the water shielding material is interposed between the two structures 12 and 15. The water shielding layer 17 is constructed in a state where the mat is pressed. Furthermore, the upper structure is constructed on the upper structure 15 by using means such as placing concrete as necessary, and the upper plate member 21 is constructed as an arbitrary structure.

  Further, for the upper structure 15 constructed so as to close the opening 6, as shown in FIG. 10, between the side caissons 11, 11a which are normal caisson adjacent to both sides thereof. Then, the water-impervious material is interposed and pressed so as to close the gap, and is constructed as vertical water-impervious layers 18 a and 18 a and integrated with the water-impervious treatment layer 17. The vertical water-impervious layer 18 is provided by sandwiching a mat or the like having a predetermined thickness and width, as well as an arbitrary water-impervious layer as in the case of using a conventionally known water-impervious treatment means between caissons. It can be constructed using water means. For example, asphalt that is provided with a partition by sandwiching rubber tube-like members between the sea side and the inner side of the connection portion with respect to the gap of the caisson connection portion, and melted between the partitions It is possible to use a means for injecting mastic and performing a sealing process so that no gap is formed, and integrating it as a water shielding layer.

(Another structural example that closes the opening)
FIG. 11 shows a caisson having a structure different from the example described in FIGS. 5 and 9 and the caisson, with respect to a structure for closing the opening by placing the upper structure on the lower structure 12. An example of using a connection structure between them is described. In this example, the lower structure 12 performs a water shielding treatment to ensure water shielding between the rubble foundation 7 and the seabed ground and the lower structure 12 in the same manner as in the above embodiments. The upper structure 15 standing on the lower structure 12 has a shape in which the upper and lower surfaces are opened. After the upper structure 15 is installed on the lower structure 12, a water shielding material is provided on the upper structure 15. It is trying to process to fill. Then, a sand layer or the like for protecting the water shielding layer is provided above the water shielding layers 17 and 17a formed between the upper and lower structures 12 and 15, and then stones or the like are packed on the top. The material is filled, and the lid 20 is installed and closed on the upper surface of the hollow caisson 12 as the upper structure.

  Even when the upper and lower caisson fitting portions 14 have a gap in the connection portion between the upper and lower side walls when placed on the lower structure 12, the water shielding material penetrates into the gap and solidifies. Therefore, the water shielding is maintained by the water shielding layers 17 and 17a. In addition, in the example of the impermeable wall described in FIG. 11, a part of the impermeable material 17a filled in the space of the connecting portion is formed on the inner side of the protruding portion of the body at the connecting portion of the upper and lower side walls. What is necessary is just to make it the shape which is combined and integrated in the state where the lower side wall of the body 15 enters. Further, the upper structure 15 placed on the lower structure 12 has an example in which only the front, rear, left and right vertical four side walls are open and opened vertically. However, the lower end portion of the side wall of the upper structure 15 is configured to overlap the side wall of the lower structure 12.

After the combination of the upper and lower caissons, the water-impervious treatment layer 17 is constructed in order to fill the gap at the fitting portion 14. For this purpose, the asphalt mastic is moved from the opening of the upper structure into the inside. It can be processed by pouring and solidifying. And as described above, after performing the process of constructing the water shielding layer 17 so that no gap remains between the upper and lower caissons, the hollow portion inside the upper structure 15 is filled with rubble, etc. The lid 21 is placed so as to assist the stability as a revetment and cover it.
In order to construct the water shielding layer 17, for example, simple means such as positioning the asphalt mat on the lid 20 of the lower structure 12 and then combining the upper structure 15 is used. However, it is also possible to employ according to the situation at the site. Further, in this example, the inner spaces 22 and 23 of the upper and lower structures 12 and 15 are protected from the water shielding layer 17a, and then the stones and rubble are placed in the spaces above and below the water shielding layer, respectively. Etc. are processed so that the interior is not left as it is.

In the example shown in FIG. 12, the upper structure 15 to be combined on the lower structure 12 is configured to have a narrow width, so that a large gap is generated between the two in the fitting portion 14a. Therefore, the gap is filled with asphalt mastic and the like, and the water shielding layer 17 is formed so that the water shielding property as the partition revetment can be exhibited.
In the example shown in FIG. 12, the lower structure 12 has a height according to the conditions of the position where the lower structure 12 is installed, and the hollow portion of the caisson is filled with stones or rubble filling stones 23. The revetment is treated against the effects of wave pressure, impact, etc. so that it can exhibit stable performance.
And the upper part of the layer of the stuffed stone is installed with a lid 20 configured separately or when a lid is installed by constructing a water shielding material such as asphalt mastic with a predetermined thickness. A similar sealing action is exhibited.

  Since the upper structure 15 installed on the lower structure 12 has a narrow width, when installed on the lower structure 12, a gap is formed inside and outside the revetment. State. Therefore, a water shielding layer 17a is constructed by filling the upper and lower caisson fitting portions 14a with a water shielding material such as asphalt mastic. The water shielding layer 17a is integrated with the lid 20 of the lower structure 12 so that water shielding at the caisson connecting portion can be exhibited. Further, an asphalt mat having a predetermined thickness is laid in advance on the upper and lower caisson fitting portions 14a, and the mat is pressed by the weight of the upper structure so that no gap is generated. Thereafter, a process of filling the gap between the fitting portions with a water shielding material may be performed.

  When the upper structure 15 installed in combination on the lower structure 12 is configured to be hollow inside, the hollow portion is filled with a filling material such as stone. On the upper structure, as in the case of ordinary breakwaters, a sealing process such as constructing a concrete cover is performed, so that a worker or a work vehicle can pass, and a wave jumps over the revetment. Take measures to avoid it. In each of the above embodiments, the water shielding material for constructing the water shielding layer is not limited to asphalt mastic, and any other conventionally used water shielding material may be used. Moreover, it is also possible to use another water shielding sheet instead of the mat.

  In the description based on FIGS. 2, 3 and the like, the upper structure for closing the opening is provided with a substantially vertical flat connecting portion between the upper structure and the caisson located on both sides of the opening. Water shielding treatment is performed with the water layer in between. On the other hand, when installing the upper structure as the additional caisson, positioning between the existing caisson on both sides can be easily performed, and the function of the water shielding layer provided between each caisson is good. As shown in FIG. 13, the caisson on both sides of the opening portion is provided with a vertical groove-shaped insertion portion. In addition, the side surface of the upper structure that is installed later to close the opening is provided with a vertical protrusion corresponding to the unevenness of the inserted portion so that assembly can be easily performed. it can.

As shown in FIG. 13, the upper structure inserted into the caisson opening is seen in a horizontal cross section so that the concavity and convexity are combined with the opposing surface of the caisson already arranged in the main body. A crank-shaped combination part (step part) is provided. Further, the water shielding layers 18, 18 provided between the upper structure 15 and the caissons 11, 11 a on both sides of the upper structure 15 are connected to each other even if a force of rocking due to the wave pressure is applied. Therefore, there will be no trouble in the water shielding performance.
As described above, an opening is provided in a part of the partition revetment to deal with the work inside the compartment, and after the work is finished and the work ship is taken out of the compartment, the opening is closed. Process it. In order to seal the opening, as described in each of the above embodiments, the upper structure is positioned and installed on the lower structure, and the caisson overlap portion is water-insulated with a water shielding material. It is carried out. By the way, in the description of each of the above embodiments, the upper structure for closing the opening can be closed using one caisson as described in FIG.

  In the example shown in FIGS. 14 and 15 apart from the example described in FIG. 3 and other drawings, the lower structure of the opening is formed by arranging a plurality of caissons, or one or two upper structures are formed. The explanation is made by arranging two caissons side by side. In the example shown in FIG. 14, in the opening 6 of the revetment main body 10, two caissons 12 </ b> A and 12 </ b> B are arranged side by side as upper structures, and upper structures 15 </ b> A and 15 </ b> B to be installed later on the upper structures are combined. The revetment can be configured. In the example shown in FIG. 15, the lower structure of the opening 6 is described as an example in which two caissons 12A and 12B are arranged side by side, and one upper structure 15C is placed thereon.

  As illustrated in FIGS. 14 and 15, the arrangement of the caissons for closing the opening varies depending on the size of the work boat used for work inside the compartment and the conditions of the work process. In addition, it is influenced by the speed of the tidal current flowing through the opening at low tide and at high tide, and the conditions of the ground where the revetment is constructed. Further, in the upper structure, unevenness is formed on the side surfaces on both sides thereof, and a structure such as a caisson is erected so that the unevenness is combined, so that the water shielding performance is exhibited well. be able to. As described above, the upper structure constituting the opening and the upper caisson disposed on the upper structure can be arbitrarily supported depending on conditions such as the structure of the revetment and the size of the ship entering and exiting. The number of caissons arranged above and below the opening is not particularly limited.

  Apart from the opening example of the partition revetment, the example shown in FIG. 16 uses the lower structure arranged in the opening as a large caisson, and is provided at the center of the caisson 12C. In the opening, a plurality of upper structures 25, 25a,... Are arranged and can be closed. The large lower structure 12C is configured in the same manner as the caisson of the revetment main body structure located on both sides. When constructing the revetment main body, the large lower structure 12C having the opening is arbitrarily selected. Build in combination with the position. When closing the opening, a predetermined number of small upper structures 25 are erected side by side with respect to the opening, and the portions where the small caisson and the large caisson are in contact with each other are arranged side by side. Each of these can be provided with vertical and horizontal water shielding layers 17 and 18 for water shielding treatment.

  As shown in FIG. 16 above, when using a caisson having a special structure with an opening provided therein, when configuring a revetment main body by arranging a large number of caissons horizontally in a row, The construction work of the partition revetment can be easily performed. When the opening is closed with a plurality of small caissons 25, 25a arranged side by side, a horizontal connecting portion between the large structure 12C and the small caissons 25. And in any of the vertical connection surfaces shown by the code | symbol 18, the connection structure on which the water shielding material as demonstrated in the said FIG. 11 was clamped can be used. Further, as will be described next, the water shielding treatment of the connecting portion can be configured as shown in FIG. 17, and both the AA cross section and the BB cross section of FIG. In addition to the example illustrated in FIG. 17 described above or FIG. 11 described above, it is possible to apply means for water shielding treatment at other connecting portions as described above.

  With respect to the example described with reference to FIG. 16, a small-sized structure incorporated in the opening of the large lower structure 12 </ b> C may be provided with a connection portion 18 having water shielding properties as illustrated in FIG. 17. it can. In the example shown in FIG. 17, the inner and outer sea-side walls of the upper structures 25, 25a... Are projected to a predetermined length, and the butted portions of the butted portions are in contact with each other. A mold frame 26 is fixedly attached to the inside, and a gap provided between the mold frame and the wall is filled with a water-blocking material to block it, and a water-blocking layer 27 is constructed to form a water-blocking layer 18 between the upper structures. Is forming. As the mold 26, for example, it is possible to configure it using any material in addition to providing a groove formed using steel or the like to the inner wall portion, and the mold 26 Without being removed, it is buried as it is, so that it is useful as it is integrated with the water shielding layer 27.

  Further, when a water shielding material is injected into the mold to provide the vertical water shielding layer 18 or the horizontal water shielding layer 17, the wall ends of the upper and lower structures or adjacent vertical walls Even if there is a gap on the abutment surface, the gap is blocked by the water-impervious material entering the gap. Therefore, the gap can be blocked by constructing the water-blocking layer. On the other hand, when a large space as shown in the figure is formed at the abutting portion of the vertical wall, measures such as sandwiching a sheet or a mat with respect to the gap are taken, and then a mold is used. It is better to fill the enclosed interior with a water barrier. By performing such a treatment, it is possible to reduce the amount of the water shielding material that leaks from the gap when the water shielding material is injected, and the water shielding material is not consumed wastefully.

The space 28 inside the structure between the walls on both sides is filled with asphalt mastic or the like in addition to sand or rubble as needed, so as not to leave a gap. Good to do. Further, in the case where an ordinary box-shaped small caisson is used as the upper structure 25... Arranged in the opening without projecting the side wall as shown, the butted portion of the side wall of the small caisson is used. Of course, the water shielding layer 18 may be formed by using a means such as sandwiching a water shielding material.
In addition, in the example illustrated in FIG. 17, a case in which connection portions 29 and 29 a having a lateral wall shape or beam members are provided between the walls on both sides is also conceivable. When using the caisson having such a configuration, the water shielding layer 27 sealing the connecting portion of the upper and lower walls from the inside, the sand portion is filled in the inner space, If the water shielding layer can be held in a state where it is reinforced from the inside, the reliability of the water shielding layer can be further improved.

As an upper structure for closing the opening, like the caisson constituting the partition revetment main body, by using a combination of the parts projecting on the sea, the appearance of the whole revetment Will not feel uncomfortable. And by providing the water-impervious layer as described in each of the above embodiments, the water-imperviousness between adjacent structures can be easily exhibited. Further, as the additional structure, it is possible to use a block-shaped member of any other configuration corresponding to the purpose and the like, and it is possible to sufficiently exhibit the performance as a partition revetment. Become.
In addition, when constructing the revetment main body, by performing a process of providing an opening in advance, it is possible to perform work inside the landfill using a relatively large work boat after partitioning by the revetment. It becomes possible.

It is a top view of the arrangement state of the partition revetment which divides a waste disposal site. It is a top view of an opening part. It is a front view of an opening part. It is sectional drawing of a partition revetment. It is explanatory drawing of the water shielding layer provided in the part which plugs up opening. It is explanatory drawing of the structure of the connection part of the example different from FIG. It is explanatory drawing of another example of a structure of the water shielding layer in the part which block | closed opening. FIG. 8 is a plan view corresponding to FIG. 7. It is explanatory drawing of another example which plugs up opening. FIG. 10 is a plan view of the example of FIG. 9. It is sectional drawing of the example different from FIG. 9 of the structure which plugs up an opening part. It is sectional drawing of the example different from FIG. It is a top view of the example which plugs up opening. It is a front view of another example of the structure which plugs up opening. It is a front view of the example further different from FIG. It is explanatory drawing of another example of the caisson arrange | positioned at an opening part. It is explanatory drawing of the connection structure of the upper structure of FIG.

Explanation of symbols

2 disposal sites, 3 foundations, 5 partition revetments, 6 openings,
7 Rubble foundation, 8 Impermeable layer,
10 revetment main body, 11 main body caisson, 12 substructure,
15 superstructure, 16 steps, 17.18 water shielding layer,
20 concrete walls, 21 superstructure, 27 impermeable layer.

Claims (11)

A waste disposal site that builds a partition revetment so as to enclose a predetermined area in the sea area, and deposits waste inside the partition revetment,
When constructing the partition revetment, leaving only the part to be closed at the end, constructing a partition revetment with water shielding between the structures to be installed as the main body of the revetment,
The opening provided to be closed at the end satisfies the condition of the tidal current in the part where the work ship working inside the area surrounded by the revetment can pass, or in the inside and outside of the closed sea area. Build the lower structure on the rubble foundation corresponding to the structure for the deadline at the position to make it correspond to the work in the section cut off at the revetment,
When the opening of the partition revetment becomes unnecessary, the lower structure below the opening and the newly installed upper structure are integrated to provide a function as a partition revetment in order to close the opening. Construction method of partition revetment characterized by that. In the construction of the partition revetment, the opening provided to be closed at the end allows the passage of the ship for work,
In the portion corresponding to the opening, the rubble foundation and the lower structure are set in consideration of any conditions such as water depth at low tide or tidal current speed and the passage of the vessel for the work. The construction method of the partition revetment of Claim 1 characterized by performing. In the partition revetment, the opening that performs the final cut-off process is attached to the joint surface of the structure that is installed later and used for the cut-off,
Between the revetment main body located on both sides of the opening and the additional structure, a water shielding material that exhibits water shielding is disposed,
The method for constructing a partition revetment according to claim 1, wherein the additional structure is installed, the water shielding material is pressed against the water, and a water shielding treatment is performed to keep the inside and outside of the partition revetment watertight. For stacking at the opening, a caisson-like structure to be installed later in the opening is stacked on a lower structure that has been built in advance on the rubbing foundation of the opening.
Between the lower surface of the upper structure to be installed for the deadline processing and the upper surface of the lower structure that has been constructed in advance on the rubble foundation of the opening, a water shielding material is interposed, Press and hold the water shielding material using the weight of the upper structure to be placed last,
The method for constructing a partition revetment according to claim 3 or 4, wherein a watertight connection is formed between the upper and lower structures positioned in the opening. In order to form a watertight connection between the upper and lower structures positioned in the opening,
On the inner surface of the connecting portion of the upper and lower structures that are combined together, a water shielding layer having a predetermined height is constructed, and the water shielding layer is fixedly held on the inner surface of the structure,
The method for constructing a partition revetment according to claim 3 or 4, wherein a watertight connection is formed between the upper and lower structures positioned in the opening.   A formwork member corresponding to a water shielding layer provided on the inner surface of the connecting portion of the structure disposed so as to overlap the upper and lower sides is provided, and a water shielding material is injected into the formwork to form the formwork. The method for constructing a partition revetment according to claim 4 or 5, characterized in that it is constructed as a water-impervious layer integrated together. As the upper and lower structures used for the cut-off at the opening, compared to the lower structure to be provided at the lower part of the opening, the upper structure to be installed at the upper part is configured with a small thickness,
The method for constructing a partition revetment according to claim 4, wherein means for sealing with a water shielding material is used at a connection portion of the upper and lower structures. The structure to be installed on the rubble foundation at the opening has the same cross section as the main structure of the revetment on both sides of the structure on both sides,
The method for constructing a partition revetment according to claim 4 or 7, wherein an opening is provided in a central portion of the structure, and is later made to correspond to a deadline of the opening. In the vertical connection between the upper structure used for the cut-off at the opening and the main body structure built in advance on both sides of the opening, or between the upper structures,
A mold member corresponding to the water-impervious layer provided on the inner side surface of the connecting portion is provided, and a water-impervious material is injected into the mold and configured as a water-impervious layer integrated with the mold. The construction method of the partition revetment of Claim 8. In the vertical connection between the upper structure used for the cut-off at the opening and the main body structure built in advance on both sides of the opening, or between the upper structures,
5. A water shielding structure in which a water shielding material is sandwiched between the projections and depressions of the vertical connection portion by using connection means provided with protruding ridges and grooves formed vertically. The construction method of the partition revetment in any one of thru | or 8.   As the water shielding material provided at the connection portion of the structure, any one of asphalt water shielding material, concrete water shielding material, cement water shielding material, chemical water shielding material, and soil water shielding material is used alone, or The method for constructing a partition revetment according to claim 1, wherein such a water shielding material is appropriately combined and used.

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