JP4596469B2 - Landfill partition revetment - Google Patents

Description

  The present invention relates to a partition revetment that is constructed as a water-impervious levee that separates from the open sea to landfill industrial waste and general waste, and to contain sewage that exudes from waste dumped inside the compartment. Further, the present invention relates to a landfill partition revetment that can perform the water shielding treatment on the joint portion of the sheet pile wall constructed by standing the sheet piles in a row, and can effectively exhibit the properties as the water shielding wall.

  In order to dispose of industrial waste and general waste at sea level, a revetment that divides the planned sea land reclamation site is constructed and constructed, and a landfill site that is cut off from the open sea is constructed. The waste is dumped within the specified range. As the partition revetment, steel (pipe) sheet pile type revetment, caisson type revetment, rubble type revetment and the like are known. In order to prevent the retained water contaminated by contacting the waste in the disposal site from the partition revetment that divides the landfill disposal site for the waste, against the main body of the partition revetment, or Water shielding treatment is performed on a separately constructed wall portion. Furthermore, for the seabed ground around the area where the disposal site is constructed, or the ground on the landfill side, if necessary, through the water shielding treatment, through the gaps in the seabed ground, There is a demand for preventing dirty water from flowing out.

In order to construct a revetment that has been subjected to the water-impervious treatment as described above, in addition to the water-impervious sheet construction method, it is conventionally made of steel using steel materials such as steel sheet piles and other arbitrary cross-sectional sheet piles. Partitioning is performed using means such as placing or embedding sheet piles in a row. Yes. In the present invention described below, the placing or embedding of the sheet piles will be collectively referred to as “standing”, but the expression “standing” may include an excavator such as a large earth auger. The steel sheet piles have been hit by conventional methods, such as drilling and building steel sheet piles using the holes, or driving and placing steel sheet piles using means such as vibration or impact. The construction method to be installed is included. In the conventional example as described above, by providing a steel sheet pile adjacent to each other, a space is provided in a portion where the joint member engages or fits between sheet piles constructed in a wall shape. The space is filled with asphalt mixture, mortar, and other fillers to form a water shielding wall. By comprising in that way, the part of the joint of a steel pipe sheet pile can be filled with the water-shielding material which can exhibit water-blocking performance, and it can prevent water leakage (for example, refer patent document 1).
JP-A-8-151630

  In the conventional example, when constructing a water shielding wall by standing steel pipe piles in a row, a male and female joint member is provided on both sides of the pile and the like, and the joint member is combined to form a water shielding part. It is composed. However, in the method of filling asphalt mixture, mortar, clay, and other water shielding materials in the space portion of the water shielding portion, a space portion having a sufficiently large cross-sectional area must be formed in the joint portion. It is difficult to completely fill the water shielding material. On the other hand, in addition to using a specially designed cross-sectional area of the space part that forms a large cross-sectional area in the joint part as a large one, as a water shielding material filling the joint part In particular, a measure such as using an asphalt mixture with improved fluidity is taken so that no gap is formed in the water shielding layer.

  In addition to the problem of the structure of the sheet pile itself, when the water shielding material is dropped and filled into the joint portion of the sheet pile from above, the filled water shielding material becomes a lump, and the lump blocks the entire cross section. In such a state, the inside of the joint part may fall. In this way, when the water shielding material falls in the joint part while remaining in a lump, the accumulated water accumulated in the lower part of the space of the joint part is pressed by the lump of the water shielding material, and mud together with water. Etc. remain as they are at the bottom of the joint part, leaving a space that is not filled with the water shielding material, leaving an inconvenient state in which the water shielding performance is not satisfactorily exhibited. As described above, the performance of the impermeable wall is improved unless the problem of detecting that the impermeable material is filled without any gap and the problem of remaining water remaining inside the joint is not solved. It cannot be done.

  The present invention has the performance of blocking the landfill from the open ocean by filling the water shielding wall provided in the landfill partition revetment with a water shielding material in the joint part of the sheet pile without gaps in order to partition the marine waste disposal site. Further, the present invention relates to a construction method that can be maintained over a long period of time. And it aims at providing the construction method which can implement the water-blocking structure to the said partition revetment easily and cheaply, and can exhibit water-blocking well.

The present invention relates to a landfill partition revetment constructed along a coast or in an arbitrary sea area in order to partition a planned waste landfill site.
The present invention divides the open sea and the disposal site, and on the side receiving waves from the open sea, a revetment main body in which caisson-like structures are arranged in a line, and a predetermined distance from the revetment main body. And building a partition revetment by combining the impermeable walls built on the disposal site side,
The impervious wall is constructed in a row by laying and standing the tip of the sheet pile up to the impervious formation of the seabed ground through a predetermined interval on the disposal site side of the revetment main body. A sheet pile wall,
In the sheet pile wall, an asphalt mixture as a water shielding material is filled in the internal space formed vertically long of the joint portion between the sheet piles erected in a row to exhibit water shielding at the joint portion. Constructed and
In order to combine the sheet pile wall and the revetment main body built on the open sea side into a single unit, partition the landfill from the open sea and enable protection,
In the part of the sheet pile joint where the sheet pile is filled with a water shielding material provided as a vertically long space, a plurality of window portions are appropriately raised in the part corresponding to the wall on the landfill side of the sheet pile wall. It can be used as a means for visually checking the state of filling of the water shielding material using the window portion,
When the water shielding material is filled into the vertically long space of the joint portion of the sheet pile, the filled water shielding material becomes a block shape, and the water or the like accumulated in the vertical hole is Even if it is pressed at the bottom of the water shielding material, it can be used as a means to discharge pressurized water through the corresponding window part, and when the window part is not required, a cap is attached. And the window can be closed,
A landfill partition revetment characterized in that the sheet pile wall and the revetment main body located on the outside sea side of the sheet pile wall are integrated to protect and partition the landfill from the open sea.

  As mentioned above, by constructing the impermeable wall on the disposal site side of the landfill partition revetment as an upright impermeable wall that can demonstrate the water shielding performance well, it was contaminated in contact with waste on the disposal site side. Water can be prevented from flowing into the open sea. In the said bank protection main body, it is also possible to construct | assemble as a sheet pile wall which arranged the sheet pile in addition to arranging a caisson in a line form and using it as a bank. For example, steel sheet piles are erected in one or two rows, and are constructed by applying a water shielding treatment to the internal space of the joint portion of the steel sheet pile or the space provided on the side surface. It becomes possible to configure the impermeable wall of the land partition revetment. In addition, by constructing the water-impervious wall by combining a sheet pile wall and a water-impervious material, the water-impervious treatment at the steel sheet pile joint, which was a weak point of the conventional construction method, is performed, and the revetment partition revetment is trusted Can be improved.

  As described above, a plurality of means for confirming the state of filling of the water shielding material at the joint portion of the sheet pile are used in combination so that the state of the water shielding wall by the steel sheet pile can be satisfactorily constructed. In addition, when using a temperature detection means for detecting the filling state of the water shielding material, it is easy to use a thermocouple, but any other temperature detection means can be used. . The use of the temperature detecting means is an effective means particularly when an asphalt mixture is used as the water shielding material. Furthermore, by using a thermocouple and an observation window in combination, it is possible to more accurately confirm the state where the water shielding material is filled, and the water shielding wall can be constructed as a better one. It also becomes.

  In addition, a material that exhibits properties as a partition member such as a steel sheet pile or a steel pipe sheet pile, or a concrete sheet pile made of concrete, or a resin or wood, can be used alone or a steel sheet pile. It is also possible to use any combination. Further, after constructing a continuous sheet pile wall by standing the sheet pile, a space between the sheet pile walls constructed in two rows or a space portion of the joint portion of the sheet pile is filled with a water shielding material. it can. As the water-insulating material to be filled, any one of an asphalt mixture or a soil-based water-insulating material, a concrete-based water-insulating material or another substance capable of exerting water-insulating properties, or the above-mentioned arbitrary water-insulating material is used. be able to. And when using the said multiple types of water-impervious material, it is possible to place and fill it so as to form a layered structure in the height direction of the water-impervious wall or in the vertical direction. Therefore, the construction of the water shielding layer can be performed according to the conditions of the construction site by using the sheet piles and the water shielding material in any combination.

  The landfill partition revetment of the present invention will be described according to the example shown in the drawing. The structure of the landfill partition revetment 1 shown in FIG. 1 is explained based on the structure of the revetment generally used conventionally, and the landfill partition revetment 1 is a dam body for partitioning a waste landfill site. Built as. For the submarine ground 2 that constructs the landfill partition revetment 1, for example, if the upper part of the ground is a water-permeable stratum such as sand, the property that water such as clay does not pass through the sea bottom 2 a. The soil that has it is deposited as a raised soil layer 4 with a predetermined thickness. After that, ground improvement treatment is applied to the soil of the ground layer 2 from the raised soil layer 4, and for that purpose, a material that exhibits any water shielding is mixed with the excavated soil, A process is performed to make the water-impermeable layer to a predetermined depth.

  In addition, regardless of whether the above-mentioned embankment soil layer is provided, in order to be able to exhibit the water-impermeable property of the seabed ground for constructing the revetment, construction for improving the ground may be performed as the improvement layer 5. . In that case, as in the case where water shielding treatment is conventionally applied to the seabed ground, a construction ship equipped with large equipment such as an earth auger is used, and the vertical holes are adjacent to each other in one or more rows. In this way, the ground improvement material is mixed with the excavated soil while excavating in a row, and a wall-shaped impermeable layer is constructed. The impermeable walls are constructed in one or a plurality of rows so as to ensure the water impermeability in each impermeable wall row. And, the soil excavated using the earth auger is used for the construction of the improved layer, which is generally adopted from the past, such as continuously performing water-impervious treatment. Possible walls can be constructed.

  The range in which the seabed ground is constructed as an improved layer is constructed as a modified layer 5 by adding and constructing within a predetermined range on the landfill side from the construction range of the foundation rubble layer for standing caissons and the like. The basic rubble layer 7 provided on the upper side of the improvement layer 5 is constructed to have a predetermined range and height, and the caisson 11 is erected in a row on the upper surface to construct the revetment main body 10. . Furthermore, on the surface on the sea side of the foundation rubble layer 7, a covering stone layer 8 in which large stones are arranged is constructed, and the small rubble that forms the foundation rubble layer 7 is affected by waves and ocean currents. The protection is performed in the same manner as in the general example of a conventional revetment so as not to be washed away.

  In the landfill partition revetment 1, a backstone layer 12 is constructed on the inland sea side or the disposal site side (referred to as the waste landfill side) of the revetment main body 10, and the backfill stone layer 12 includes gravel. Are formed by stacking high-quality materials such as, and a sand-proof sheet 13 is laid on the upper surface thereof, and then a protective layer 12a in which non-dirty sand or the like is deposited is constructed to protect the surface. The caisson 11 erected as the revetment main body 10 can be configured using a concrete caisson, a so-called hybrid caisson in which the surface of a steel caisson main body is coated with concrete, or a large concrete block. And the structure main body which performed the water-impervious process to the seam part of the said caisson, and was made to exhibit the property as the water-impervious wall which divides an open sea and a landfill well is constructed | assembled.

  In parallel with the construction of the backfill stone layer, a self-supporting sheet pile wall 15 is erected or constructed at a predetermined distance from the revetment main body 10. The sheet pile wall 15 is constructed by placing sheet piles having an arbitrary cross section in a row, and penetrates the ground improvement layer 6 from the backfill stone layer 12 to a predetermined depth in the seabed ground. It is constructed so that it can penetrate. As will be described later, the construction method used for constructing the water-impervious wall 15 is erected using a means such as placing an arbitrary sheet pile such as a steel sheet pile, etc. It is constructed as a wall capable of satisfactorily exhibiting water shielding properties by filling the inner space of the seam portion of the steel sheet pile with a water shielding material.

  Furthermore, when the water shielding sheet 16 or the like is disposed along the inside of the sheet pile wall 15, the water shielding sheet 16 combined with the sheet pile wall 15 is constructed as a double water shielding wall capable of exhibiting water shielding. Can do. In addition, the block 17 of the asphalt mixture is constructed in the portion located on the bottom sea surface 2a below the sheet pile wall 15, and the lower end portion of the water shielding sheet 16 is pressed and held, and the boundary portion with the seabed ground It is also possible to perform a treatment that better exhibits the water-blocking property. Further, an anchor block 17a of an arbitrary size is constructed on the side of the block 17, and the water shielding action at the boundary between the ground and the water shielding material is maintained stably. The material used for the water shielding means and the cross-sectional shape of the block are not particularly limited.

  In the landfill partition revetment shown in FIG. 1, as shown in FIG. 2, the sheet pile wall 15 is provided with box-shaped steel sheet piles 31, 31 a. The connecting members 34... Provided at the end portions are constructed so as to be sequentially connected. The box-shaped steel sheet pile 31 has a cross-sectional shape in which two middle plates 33 are arranged at right angles between side plates 32 arranged in parallel at predetermined intervals on both sides. Yes. In other words, in this box-shaped steel sheet pile 31..., The side plates on both sides are extended with respect to the box-shaped space portion formed in the center portion, and the joint connection portion is formed at the end of the extension portion. It is a thing.

  In constructing the water-impervious wall 30 using the box-shaped steel sheet piles, the water-impervious wall 30 is erected in a hole excavated with an auger, or arranged with a hammer or the like. And the joint part 35 ... is each formed in the part connected by the connection member 34 ... of the both sides of the said sheet pile. Therefore, the interior space formed in the joint portion 35 is filled with an asphalt mixture or other water shielding material 36 so that the water shielding performance at the joint portion can be satisfactorily exhibited.

  In the water-impervious wall as described in FIG. 2, an asphalt mixture or other material having a water-impervious property is used as the water-impervious material 36 for the joint portion 35. 36 may be mixed with air, or water may remain to form a space inside. This is considered to be because the cross-sectional shape of the joint portion 35 is narrow or the fluidity of the water shielding material is insufficient. In any case, when the above-described problem occurs, a state in which the water shielding material 36 is not sufficiently packed in the internal space of the joint portion 35 occurs. If formed inside, the water shielding function at the joint portion cannot be exhibited well, and a water shielding layer having defects is formed.

In order to prevent the above-mentioned defects in the impermeable wall, the following countermeasures can be considered.
(A): A method of strictly managing quantity inspection. For this, the amount of the water shielding material actually placed is confirmed with respect to the volume of the joint part filled with the water shielding material, and the filling state is confirmed and confirmed on the calculated number.
(B): Confirmation method using a thermocouple. This method detects that the temperature inside the space changes due to the filling of the water shielding material. In particular, the water temperature at the site where the water shielding wall is constructed and the temperature of the water shielding material are detected. The greater the difference, the easier the detection.
(C): An inspection eye (monitoring window part) is provided at a certain interval in the vertical direction of the joint part, and water, mud, etc. are discharged from the opening as the monitoring window part. While observing, it is confirmed that the water shielding material comes out thereafter, and it is determined that the water shielding material is filled in the joint portion.

Of the above methods (a) to (c), one or a plurality of observation methods are combined to observe that the joint portion is filled with the water shielding material.
Of the three observation methods, the method of strictly checking the quantity filled with the water shielding material in (a) is not particularly troublesome, so (b) and (c) will be described below.
In addition, as a water shielding material with which the joint portion is filled, a material conventionally used as a water shielding material in a water shielding wall can be used. And by adjusting the fluidity of the water shielding material, as a water shielding material filling the joint part, in addition to the asphalt mixture, a mortar and clay fluidity-adjusted mixture has been used in the conventional impermeable walls. It is possible to use a material that is used as a water shielding material and to adjust the fluidity of the water shielding material.

  The example of the impermeable wall illustrated in FIG. 3 is constructed by arranging box-shaped steel sheet piles as illustrated in FIG. 2 in a row to construct the impermeable wall 15, and with respect to the joint portion 35 of the joint. The method for detecting the filling of the water shielding material is described. This detection method can be used to detect that the filler material is filled in an arbitrary sheet pile wall. In the step of injecting the water shielding material 24 into the joint portion 35, the water shielding material is used. A method is described in which it can be easily detected whether or not 24 has entered sufficiently. First, in the method using the thermocouple of (b), the thermocouple 20 is suspended from above with respect to the joint portion 35 and held at a predetermined height to change the temperature inside the joint portion. Is detected. As the thermocouple 20, a commercially available one can be used. The thermocouple 20 is held by a cable 21, and the temperature at the position where the thermocouple 20 is placed is measured by a meter connected to the upper end of the cable. Make it detectable.

  In the measurement method using the thermocouple, for example, when the difference between the seawater temperature and the temperature of the water shielding material is as large as possible at the place where the water shielding wall is constructed, it can be used effectively. Therefore, when an asphalt mixture is used as a water shielding material to fill the joint part, even if the seawater temperature is about 10 ° C, the temperature of the asphalt mixture has a difference of 100 ° C or more. It is possible to easily detect that the water shielding material 24 is filled up to the position where the pair 20 is installed. For the reasons described above, it is expected that the thermocouple used for this purpose can sufficiently function as a sensor even if its sensitivity is relatively rough. On the other hand, when using mortar, concrete, or the like as a water shielding material, the difference in temperature between the seawater temperature of the sheet pile wall to be placed and the water shielding material may be small. It is necessary to use one that can detect temperature differences sensitively.

  Apart from the method using the thermocouple, in the observation method (c) using the peeping monitoring window portion, the landfill side of the connection portion of the sheet pile of the water shielding wall 15 A method is used in which a window is provided on the side surface and the interior space of the joint portion 35 is confirmed to be filled with a water shielding material. In the inspection eye (monitoring window) 25, an opening 26 of an appropriate size is provided at an arbitrary height on the side of the sheet pile, and when the opening is not used, a cap 27 is attached. To close.

  When the monitoring window 25 is used, the cap 27 is removed with respect to the opening 26 having a height used for detection when the water shielding material is introduced from above the joint portion 35. The cap 27 is closed after confirming that the water-impervious material 24 to be filled overflows from the opening 26. As the cap for closing the opening, a screwing method or other fixing means can be used, and any fixing method that can easily cope with work in the sea can be selected.

  In the case of using the method of filling the joint portion with the water shielding material, the water entering the lower portion of the joint portion 35 is opened by the water shielding material introduced from the upper portion of the joint portion. Since it is discharged as it is pushed out sequentially from the opening, no water remains inside. In addition, even when bubbles and water are in a lump in the water shielding material, by providing a plurality of openings through a predetermined interval in the height direction for the vertically long joint part, It is possible to sufficiently fill the water shielding material from the lower part of the joint part. In order to observe the state in which the water shielding material overflows from the window (opening) 26 for the monitoring window, an underwater camera for monitoring is placed on the opening, or a diving worker directly What is necessary is just to make it close a cap, after confirming that the water-impervious material is filled using means, such as visual observation.

  As described above, when observing that the water shielding material is filled in the joint portion using the monitoring window portion as the observation window portion, the water shielding material is filled in the joint portion. This state can be directly visually monitored. In addition, most importantly, when the joint portion has a relatively narrow opening area (cross-sectional area), when a highly viscous (low fluidity) material such as an asphalt mixture is injected. The water shielding material becomes a lump (block) and flows down in a state of blocking the cross section of the joint part, and the water shielding material block is sealed so as not to let the water below escape. There is.

  Even when the above-mentioned inconvenience occurs, as shown in the embodiment, an opening of the observation window is formed in the lower part of the joint so that it is crushed by the water shielding material. Even when the pressure is applied, the air and water inside the space are discharged so as to be pushed out from the opening 26 of the observation window 5. Therefore, as in the case of using the conventional method for placing a water shielding material, the air and water in the lower part are moved upward from the gap between the wall of the joint portion and the water shielding material by the water shielding material falling in a lump. Even if it is in a state where it cannot escape, it will be pushed out from the opening (window) provided in the lower part of the joint part and easily discharged.

  As described above, when using the observation window as an auxiliary means for filling the water-impervious material, as much as possible in the lower part of the impermeable wall or in the vicinity of the base of the sheet pile (the sea bottom) If the opening is provided at a position close to (), the accumulated water and earth and sand accumulated in the lower part of the joint portion can be easily discharged. Furthermore, if a plurality of openings 26... Are provided in the upper part of the lowermost opening at a constant interval, the water shielding material can be packed without a gap even if the joint part has a narrow cross-sectional area. .

  In addition, in the conventional construction method of water-impervious walls, before filling the asphalt mixture at the connection part of the sheet pile, technology such as air lift is used together with water containing earth and sand entering the space to be filled. Therefore, it was necessary to carry out sufficient pretreatment such as elimination. On the other hand, as described in the present embodiment, when the observation window is provided at the lower part of the joint, it is not necessary to clean the inside of the space filled with the water shielding material. In other words, the water inside the joint part is pushed down by the water shielding material introduced from the upper part, and water and mud etc. are discharged from the lower opening. Will be discharged.

  As described in FIG. 2, in addition to the landfill partition revetment constructed using a box-shaped steel sheet pile, as a landfill partition revetment, sheet piles having various cross-sectional shapes as described in FIG. The water-impervious wall can be constructed, and the water-impervious treatment in which the water-impervious material is filled into the joint portion between the sheet pile walls can be performed. Then, as the cross-sectional area of the joint portion is smaller, the water inside the joint portion is discharged by pushing out the water inside the joint portion as described with reference to FIG. The material can be packed without gaps.

  In the example shown in FIG. 4, the water-impervious wall 40 is constructed by using a sheet pile having a substantially U-shaped cross section and surrounded by a joint plate so as to cover a connection portion between two sheet piles as one joint portion. is doing. In this example, the inner space of the joint portion is filled with a water shielding material to construct a wall that can satisfactorily exhibit water shielding. In the water-impervious wall 40 described in FIG. 4, the sheet pile members 41, 41 a... That are driven by changing the direction of the U-shaped grooves so that the wall irregularities are alternately formed are the sheet pile members 41. The joint plate 45 is disposed so as to cover the two connection portions 42 and 42a on both sides of the inner side from the inside of the concave portion, and the joint portion 44 having a large cross section surrounded by the sheet pile member and the joint plate is formed. Then, by filling the joint portion 44 with a water shielding material, it is possible to perform a treatment that can satisfactorily exhibit the water shielding performance for the portion including the connecting member.

  In the embodiment of the impermeable wall using the sheet pile members 41, 41a, the intermediate plate 45 is constituted by using a flat plate having an arbitrary thickness, and elongated plates are attached to both ends of the intermediate plate 45, etc. It is assumed that the insertion portions 46 and 46a have undergone the above processing. And with respect to the sheet pile member 41 which exposed the groove | channel, by inserting and fixing the said insertion part in each of the to-be-inserted parts 47 and 47a provided in the outer surface part of the sheet pile member of the both sides, a sheet pile member and a relay A joint portion 44 surrounded by a plate can be formed. As the inserted portions 47 and 47a, by inserting both sides of a long and slender plate into a receiving portion configured in a shape provided with facing slits, the intermediate plate for the sheet pile member is fixed and held. The effect can be exhibited satisfactorily.

  In addition to the water-impervious wall described with reference to FIG. 4, as shown in FIG. 5, sheet pile members 51, 51 a. Can do. In the embodiment of FIG. 5, for each connection portion of the sheet pile member 51..., A joint portion provided with a space for filling a water shielding material is formed on one side of the wall. Fill with water shielding material so that water shielding can be achieved well. Each of the connecting members 52, 52 a, 52 b... Is provided with arc-shaped intermediate plates 55, 55 a... On both sides thereof, and both end portions of each said intermediate plate 55. Are fixedly attached with vertically elongated insertion portions 56... And inserted portions 57... Are arranged on both side portions of the connecting portion. And, by inserting and fixing the insertion portion to the insertion portion on both sides of the intermediate plate 55, the joint portion 54 is formed, and by filling each of the joint portions 54. It becomes possible to exhibit the water shielding performance well.

  In each of the water-impervious walls 40 and 50 described in FIGS. 4 and 5, the above-described embodiment is described in order to improve the efficiency of the work of filling the water-impervious material and to fill the water-impervious material without a gap. An observation window may be provided as described above. That is, with respect to the intermediate plates 45 and 55 as the plate members surrounding the intermediate plate, an opening as one or a plurality of monitoring windows is provided at an arbitrary height, and from the openings In addition to discharging water and mud inside, work to form a water shielding layer so as not to create a gap by filling the inner space without gaps by inserting a water shielding material from the top of the joint. . Therefore, even if the joint portion formed at the connection portion of the sheet pile member has a relatively small cross-sectional area or the fluidity of the water shielding material is not good, It is possible to satisfactorily perform the filling operation of the water shielding material.

  In addition, when filling the water shielding material, the observation window is used for monitoring, and a thermocouple is used in combination with a method for calculating the filling amount of the water shielding material with respect to the volume of the intermediate plate at the same time. can do. As described above, it is possible to easily confirm that the water shielding material is filled without any gaps, and it is possible to further improve the reliability of the work for forming the water shielding layer. In the example described in FIG. 5, sheet pile members 51, 51 a... Having a substantially crank-shaped or L-shaped cross section are driven into the seabed ground so as to be connected to each other via connecting portions 52. The thing which has constructed the impermeable wall 50 is described.

  In addition to constructing a water shielding wall using the sheet piles, in recent years, a water shielding wall using a large-diameter steel pipe pile has also been constructed. In the example of the water shielding wall 60 illustrated in FIG. 6, an example in which large diameter steel pipe piles are erected in a row to construct a water shielding wall is described. The steel pipe piles 61, 61 a. The water shielding wall 60 is constructed so as to stand up sequentially. The steel pipe pile uses a pipe having a diameter of several meters. However, in the example shown in the present embodiment, a small diameter pipe 63 is used as a connecting member for the large diameter steel pipe piles 61, 61a. , 63a are fixedly attached to the side of the pile. Further, in order to construct a water shielding layer by filling a water shielding material, a connecting means by attaching an intermediate plate to the side portion of the connecting portion by the small-diameter pipe is also provided.

  In the example of the water-impervious wall 60 using the large-diameter steel pipe pile, the small-diameter pipes 63 and 64 are fixed to both side portions of the steel pipe pile using means such as welding, respectively. Are provided with slits 63a, 64a,. And when forming the connection part 62 combining the said small diameter pipe, it can combine in the state which inserts the small diameter pipe which opposes with respect to the slit of one small diameter pipe, as shown in the figure. Further, at the side portion of the connecting portion 62, the connecting plates 66 and 65a are attached to the steel pipe piles 61 and 61a, and the connecting means provided at the end portions are combined to form the connecting member 66. As the connection material provided on the intermediate plate, conventionally known connection means such as a sheet pile connection means can be provided. At the same time as forming the connection portion 62 combining a small diameter pipe, combining the intermediate plate Connecting.

  And, the interior of the space 68 defined by the two connecting members 62 and 66 of the small-diameter pipe and the plate member is filled with a water shielding material 67, and as a water shielding treatment unit in which both are integrated. To construct. Since the cross-sectional area of the joint portion 68 is very large, it is very easy to construct a water shielding layer filled with a water shielding material. On the other hand, in the connecting portion 62 in which small diameter pipes are combined, as shown in the figure, it is necessary to inject a water shielding material into each of the three sections. Injection is required without creating a gap. By the way, in the connection part 62 which combined the said small diameter pipe, since the slit is provided in order to combine a small diameter pipe, for example, when a water-impermeable material with good fluidity is used, the internal water is removed from the slit. Since the water shielding material flows down while being discharged, it is possible to fill the water shielding material relatively easily without a gap, as in the method using the observation window.

  The example illustrated in FIG. 7 is a partition means using an arc-shaped plate member 65A on the side of the connecting portion 62 combined with a small-diameter pipe in the same manner as the water shielding wall 60 using the steel pipe pile. Is provided. Both end portions of the intermediate plate 65A are attached via connecting means provided on the steel pipe piles 61, 61a. By holding the intermediate plate 65A by the connecting means 66A, 66B, A joint section 68 having a large cross-sectional area is formed therebetween. And while injecting a water-impervious material to the joint part 68, the connecting member 62 combined with a small-diameter pipe is also filled with the water-impervious material so that the water-impervious property at the connection part can be exhibited well. I have to.

  The example shown in FIG. 8 is constructed as a water-impervious wall by filling the joint between the sheet piles with a water-impervious material, similar to the example of FIG. An application example of this example is described. In this example, as described also in FIG. 9, sheet piles 31, 31 a... Are placed adjacent to each other in a row, and connection members 34 provided at the end of each box-shaped steel sheet pile 31. ... are constructed to connect sequentially. In the water-impervious wall 30 constructed as described above, the space part 35 connected by the connection members 34... Is filled with the water-impervious material 36 so that the water-impervious property at the connection part can be satisfactorily exhibited. As described above, this processing is performed. In addition, when the example shown in the said FIG. 8 and FIG. 9 fills a joint part with a water shielding material and constructs the water shielding wall which can exhibit more reliability, the method demonstrated below is needed as needed. It explains what can be adopted.

  8 and 9, when filling the joint portion 35 with a water shielding material 36 such as an asphalt mixture, the water shielding material 36 is filled in the internal space. The auxiliary pipe 70 is provided upright so as to reach the lower part of the space. As the auxiliary pipe 70, it is considered that a pipe having a diameter as large as possible should be used, but a pipe having an appropriate diameter is selected and used in accordance with the size of the space of the connecting portion. And the state in which the said water-impervious material 36 is not fully packed in the inside of the joint part 35 for the reasons that the cross-sectional shape of the joint part 35 is narrow, the fluidity of the water-impervious material is insufficient, etc. To prevent it from occurring. If the above-mentioned problems cannot be solved, the muddy water remaining in the joints may be taken in and remain in the water-blocking material, and foreign matter may enter the space where the water-blocking material should be filled. If present, the water shielding effect at the joint portion cannot be satisfactorily exhibited, and a water shielding layer having defects is formed.

  As shown in FIGS. 8 and 9, the auxiliary pipe 70 used when filling the joint portion with a water shielding material can be a pipe-shaped pipe having an arbitrary diameter. You may use a pipe or a metal thing. The auxiliary pipe 70 is erected in the space of the joint portion of the sheet pile, and bears the role of eliminating muddy water pushed out from the lower portion of the space of the joint portion by bending the upper end portion thereof downward. When filling the joint portion with a water shielding material such as an asphalt mixture, when the asphalt mixture is charged from above the space portion, the mixture may be in a block shape and fall in a state of closing the gap portion. . Even if such a situation occurs, the remaining water such as mud remaining in the lower part of the block of the asphalt mixture is pushed out through the auxiliary pipe 70 and discharged. Therefore, when the discharged muddy water is observed, the muddy water staying at the joint of the sheet pile can be easily observed by observing the color of solids and water contained in the drainage, and other conditions. It becomes.

  As described above, a pipe having an arbitrary diameter is provided standing inside the joint part, and by providing a means for discharging the accumulated water staying in the internal space of the joint part from the upper part of the joint part, The filling efficiency of the water shielding material can be improved. That is, when filling the water shielding material from above the joint portion, the water shielding material falling inside the joint portion becomes a lump, and even if there is no gap for water to rise, the accumulated water inside the joint portion is passed through the pipe. By discharging, the lower water and the like are easily discharged through the pipe.

  Further, in the case of using the drainage means using the pipe, when draining the staying water staying in the internal space of the joint part from the upper part of the joint part, the drainage is observed, Can be easily observed. Furthermore, in the case of using a means for confirming filling of a plurality of water shielding materials by combining the drain pipe, an observation window provided at a predetermined position on the side of the joint part, a temperature observation means, etc. It is possible to observe the state where the water shielding material is filled more accurately.

  The pipe provided upright inside the joint is pulled out and removed after the inside of the joint is filled with a water shielding material, and the water inside the space of the joint is filled with a water shielding material to construct a water shielding wall. Is possible. In addition, if the pipe is left in the water shielding material without being pulled out, it can also be used for observation of the state of the water shielding layer thereafter, and the inside of the pipe can be maintained in a hollow state. You may do it. And, when it is judged that dirty water or the like has leached into the pipe left in the water shielding layer and the reliability of the water shielding layer has been impaired, measures can be easily taken. it can.

  As described above, the auxiliary pipe 70 is erected as shown in FIG. 9 in the same manner as in the case where the observation window portion is provided and the water shielding material is filled from the window portion. It may be possible to confirm from above that the water shielding material introduced from the upper part of the section overflows and is discharged through the auxiliary pipe 70. If such observation means can be used, it is required that the fluidity of the water shielding material is good, but this is not possible when using, for example, a clay-like water shielding material. is not. Furthermore, when the bend portion 71 of the pipe is located at a position lower than the pouring position with respect to the water shielding material thrown in from the upper portion of the joint portion, and the opening portion is located below the inner portion, It becomes possible to perform the effect | action which discharges earth and sand etc. favorably.

  As described above, in the example described with reference to FIGS. 8 and 9, when constructing a water shielding wall by standing a sheet pile or a steel pipe pile, a water shielding material by a water shielding material is used at a joint portion such as the sheet pile to be erected. Auxiliary means that can easily perform the treatment and can inject and fill the water shielding material without gaps are used. As described above, as the auxiliary means for filling the water shielding material, in addition to accurately detecting the filled quantity (volume), a detecting means using a thermocouple is provided in the internal space filled with the water shielding material. It is arranged to detect changes in temperature inside the intermediate plate and to confirm that the water shielding material is filled. Furthermore, in combination with each of the above confirmation methods, or by using an observation window as an independent detection means, by checking the filling state of the water shielding material, the water shielding material can be used even in a narrow space. It is possible to form a water shielding layer that can be filled without gaps and has good reliability.

  When constructing a water shielding wall by standing the sheet pile or steel pipe pile, if the cross-sectional area of the connecting plate of the sheet piles is large and the amount of the water shielding material is very large, It is also possible to substitute a part of the water shielding material with an auxiliary filling made of other solid materials. As the auxiliary filling, a concrete lump, an appropriately sized stone, or a metal lump that does not interfere with the water shielding function of the water shielding material is selected. It is good to insert in the water shielding material. And when using the auxiliary filler in combination with a water shielding material, the amount of the water shielding material is reduced without affecting the properties of the water shielding treatment part, and the landfill partition revetment It makes it possible to reduce the construction cost.

  In addition, in order to construct a water-impervious wall, a steel sheet pile or steel pipe sheet pile, or a self-supporting sheet pile such as concrete, or a material that exhibits properties as a partition member such as resin or wood, can be used alone. Or, it can be used in combination with steel sheet piles, and can be constructed as a revetment suitable for the landfill. Furthermore, after constructing a continuous sheet pile wall by erecting the sheet pile, as a water shielding material filling each of the space between the sheet pile walls and the space between the sheet pile main body or the joint portion, asphalt Any one of a mixture or a soil-based water shielding material, a concrete-based water shielding material or another substance capable of exerting water shielding properties, or the above-mentioned arbitrary water shielding material may be combined in a layered manner and filled. This is possible as described above. And by using the sheet piles and the water shielding material in any combination and constructing the water shielding wall, the construction of the water shielding layer can be performed according to the conditions of the construction site.

  In the example of the revetment shown in FIG. 1, after the backfill soil is constructed on the backside of the revetment constructed by standing caisson, the slope on the landfill side is also shielded. A water mat 13 or a sheet is laid so that the water-blocking property is exerted more firmly. Such a water-impervious work can also be applied to a partition revetment having an arbitrary structure, and even when a water-impervious mat or sheet is laid on the slope as well, A pressing member such as a block may be constructed at the lower end of the sheet or mat to fix the end. And by constructing in combination with the treatment of laying a water shielding sheet along the side surface of the caisson and the water shielding treatment for the slope part of the soil, the water shielding at the water shielding wall can be exhibited better, and the structure Things can be stabilized.

  As described above, when building structures such as caisson in a row and building a partition revetment, the impervious ground improvement work so that the permeability coefficient of the submarine ground as the supporting foundation is made small. Install. By constructing the asphalt mixture with a predetermined thickness between the lower part of the caisson and the impervious ground improvement part serving as the support base together with the treatment work, water shielding can be satisfactorily exhibited. And, by installing an asphalt mat between the lower part of the caisson and the impermeable ground improvement part and constructing a water shielding layer that does not create a gap, water shielding treatment can be easily performed, and the reliability of the partition revetment Can be improved. In addition, even when the seabed ground for constructing the revetment is a rock having a small hydraulic conductivity, a process such as building an asphalt mixture with a predetermined thickness is performed between the base of the caisson to be installed and the seabed ground. Therefore, the water shielding property can be exhibited well.

It is explanatory drawing which shows the structure of an offshore structure. It is explanatory drawing of the structure of a water-impervious wall. It is explanatory drawing of the detection means of the impermeable material provided in the impermeable wall of FIG. It is explanatory drawing of the structure of the impermeable wall constructed | assembled using a sheet pile. It is explanatory drawing of the impermeable wall of a structure different from FIG. It is explanatory drawing of the impermeable wall constructed | assembled using a steel pipe pile. It is explanatory drawing of the impermeable wall using the steel pipe pile different from FIG. It is explanatory drawing of the application example using the means which excludes stagnant water in a joint part. It is a side view of the example shown in FIG.

Explanation of symbols

1 Landfill partition revetment, 2 Submarine ground, 5, 6 Ground improvement department,
7 foundation rubble layer, 10 revetment main body, 11 caisson, 15 sheet pile wall,
16 water shielding sheet, 20 thermocouple,
25 observation window, 26 opening, 27 cap,
30, 40, 50, 60 Impermeable wall, 31 Box-shaped steel sheet pile,
34 connecting member, 35 joint part, 36 water shielding material,
41, 51 sheet pile member, 43 connecting member, 45 intermediate plate,
61 Steel pipe pile, 62 Connection member, 63, 64 Small diameter pipe,
65 intermediate plate, 66 connecting member, 70 auxiliary pipe.

Claims (1)

A landfill partition revetment built along the coast or in any sea area to demarcate the planned waste landfill site ,
The revetment main body that divides the open sea and the disposal site and receives waves from the open sea on the side where the caisson-like structures are arranged in a line, and the disposal site side at a predetermined interval with respect to the revetment main body Building a partition revetment by combining the impermeable walls built in
The impervious wall is constructed in a row by laying and standing the tip of the sheet pile up to the impervious formation of the seabed ground through a predetermined interval on the disposal site side of the revetment main body. A sheet pile wall ,
In the sheet pile wall, an asphalt mixture as a water shielding material is filled in the internal space formed vertically long of the joint portion between the sheet piles erected in a row to exhibit water shielding at the joint portion. Constructed and
In order to combine the sheet pile wall and the revetment main body built on the open sea side into a single unit, partition the landfill from the open sea and enable protection ,
In the part of the sheet pile joint where the sheet pile is filled with a water shielding material provided as a vertically long space, a plurality of window portions are appropriately raised in the part corresponding to the wall on the landfill side of the sheet pile wall. It can be used as a means for visually checking the state of filling of the water shielding material using the window portion ,
When the water shielding material is filled into the vertically long space of the joint portion of the sheet pile, the filled water shielding material becomes a block shape, and the water or the like accumulated in the vertical hole is Even if it is pressed at the bottom of the water shielding material, it can be used as a means to discharge pressurized water through the corresponding window part, and when the window part is not required, a cap is attached. And the window can be closed ,
A landfill partition revetment characterized in that the sheet pile wall and the revetment main body located on the outside sea side of the sheet pile wall are integrated to protect and partition the landfill from the open sea .

Images