JP2010270592A - Method for repairing water shielding layer of reclaimed revetment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily perform repair in case of a defect such as crack of a water shielding layer in a reclaimed revetment constructed to surround the circumference of a reclaimed site while covering the surface with a water-shielding layer. <P>SOLUTION: When a defect such as a crack 14 occurs in a water-shielding treatment layer 10 provided to cover the surface of a structure, the repair is performed by mounting a work frame 31 having a size to cover the crack including the circumference and opened to the bottom, laying a sheet of the same material as the water-shielding layer, and filling an asphalt mixture or the like thereon to superpose a new water-shielding layer. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a landfill revetment that divides a waste sea surface disposal site, etc., laid along the revetment surface against a revetment that partitions an artificial island of the disposal site from the open sea, and tidal currents / waves, tidal fluctuations, or The present invention relates to a water-blocking structure of a landfill revetment to prevent water inside the disposal site from flowing into the open ocean due to residual heads in a partitioned area, and a repair method when a defect occurs in the water-blocking layer.

In order to dispose of waste in landfills, a disposal site has been constructed in mountainous areas, etc., and in the disposal site, sheet-like water shielding bodies such as a water shielding sheet are laid on the surrounding ground. The waste is dumped after the construction of the impermeable layer.
However, the disposal site is often located in a place far away from a city or an industrial area that discharges a large amount of waste, and has a problem of transportation for transporting the waste.

  In addition, land disposal sites have problems such as difficulty in obtaining the consent of residents from the viewpoint of environmental protection in the surroundings, and it is difficult to secure a large-scale waste disposal site. Therefore, in the future, in the vicinity of cities where waste is discharged in large quantities, construct a disposal site by dividing the sea area, construct a new land using waste, and shorten the transport distance from the discharge area It is considered to be able to cope with this.

  When constructing the waste disposal site on the sea surface, generally, at the construction site of the revetment in the landfill, the ground improvement work for strengthening the seabed ground is constructed, and the masonry foundation is set to a predetermined height. In this construction, the upper surface is leveled flat, and a ready-made structure such as a caisson is arranged on the foundation. (For example, see Patent Document 1)

In such a case, in order to provide the structure and the masonry foundation with water-impervious properties, as with land disposal sites, a water-proof sheet and a protective mat are laid on top of each other and blocked by waste. The water sheet is stabilized against the masonry foundation.
In addition to the sea surface landfill site, when constructing an artificial island by partitioning the sea surface within a predetermined range, as with the construction of the artificial island, the predetermined sea area is partitioned by revetment, Even when construction is carried out on the inside seabed ground, construction is carried out in the same manner as the landfill disposal site, and it is constructed as a revetment with a water-impervious property.

  As the sheet used as the water shielding sheet or the like, for example, a thin rubber sheet or a sheet having a property of impervious to plastic such as vinyl chloride is used. In addition, between structures such as caisson installed on the masonry foundation, as a measure for preventing water permeation from the joint between the caissons, generally a rubber partition material having elasticity is inserted between the caissons. Build a water-impervious layer that is arranged through a predetermined interval and prevents the internal retained water from leaching from the joints such as caisson by performing treatment such as filling the asphalt mixture between the partition materials Yes.

JP 7-305322 A

  However, when the sheet having the water-impervious sheet is constructed in the sea, the sheet is relatively thin and light, so that it is accurately laid in a required place by being exposed to wind or waves. Difficult to do. And when constructing the water shielding sheet so as to cover a wide area of the corner of the landfill revetment, connect the connection part after processing the water shielding sheet to match the shape of the corner in the sea However, it is necessary to secure the water shielding at the connection part, but the connection of the water shielding sheet to be connected is not stable or the shape of the corner part is complicated and the connection is troublesome. is there. In addition, when laying the water-impervious sheet, the weight member and other auxiliary means are used together, which causes a significant increase in construction cost.

  In addition, when laying a water-impervious sheet in the sea, the soil cannot be leveled like a land-based disposal site and is placed on the surface of a stone wall with large irregularities. There is a problem that the portion hitting the protrusion is likely to be damaged, and it is difficult to ensure water shielding by the water shielding sheet. In addition to the above problems, the bottom surface of the masonry foundation that supports the caisson is under construction to improve the submarine ground, so the support for the structure body can be demonstrated stably. Because of the consolidation, the problem is that the submarine ground will sink due to waste, and the sheet laid from the edge of the masonry foundation toward the seabed will be pulled, causing damage to the impermeable sheet, etc. The occurrence of this problem is assumed.

  Furthermore, even in the water-shielding layer configured in multiple layers, there may be a case where a large material such as construction material falls or breaks before the waste is dumped. In addition, even when the waste is being dumped, some impact may be applied to form a tear in the water shielding layer, resulting in a defect in the water shielding performance.

  However, when the water shielding sheet is damaged, the conventional method is to pull up the torn water shielding sheet and paste the repair sheet on the ship. In addition, it takes a lot of time and cost to re-float the sheet, and it is difficult to withstand long-term use in such repair, and development of more effective repair means is desired.

  The present invention solves the problem of repairing the water-impervious treatment layer in the sea as described above, and can easily construct the water-impervious layer, and can improve the water-impervious performance for a long period of time. The purpose of the present invention is to provide a management-type revetment provided with a water-impervious layer that can be secured over a wide area, and can easily perform a process of connecting a seam of a sheet and repairing a damaged portion.

The present invention relates to a repair method when a defect occurs in a water shielding layer in a revetment surrounding a marine landfill site of waste.
The invention of claim 1 is constructed by arranging prefabricated structures such as caisson and L-shaped blocks on the masonry mound constructed so as to surround the landfill, and divides the open sea and the landfill. In addition, in the landfill revetment where the seabed mound of the revetment and the connection part of the structure are made not to allow water to pass, and the seabed ground and the revetment component are made as an integral impermeable layer. Laying a sheet-shaped impermeable body over a predetermined range of both the landfill side and / or the open sea side of the landfill revetment and the seabed ground for constructing the revetment structure, or the sheet Of a water-impervious treatment layer of a layered water-impervious body and an asphalt mixture layer, by constructing one of the water-impervious means and providing a water-impervious treatment layer. If this occurs, the tear will be centered. In addition, a sheet-shaped impermeable body or an asphalt mixture is applied to cover the area with an arbitrary width and thickness. It repairs so that it may become a water-impervious treatment layer continuous with the water-impervious layer.

  According to the invention of claim 2, there is a defect that a tear occurs in the water-impervious treatment layer when the rows of structures provided so as to partition the landfill from the open sea are connected at a predetermined angle. In such a case, the sheet-shaped impermeable body is overlapped in a predetermined range with the water-impervious layer provided so as to cover the two structures, and the sheet-shaped impermeable body is overlapped with the overlapping portion of the sheet-shaped impermeable body. The asphalt mixture layer is constructed with a predetermined thickness so as to cover the periphery of the overlapped area with a predetermined thickness, so that the water barrier layer is continuous with the water barrier layer provided on the revetment structure. It is characterized by doing.

  According to the invention of claim 3, in addition to the water-impervious treatment layer at the connection portion of the landfill revetment structure, a defect such as a tear has occurred in a part of the existing water-impervious treatment layer covering the revetment structure. If it occurs, an additional water-impervious treatment layer with a sheet-like water-impervious body or asphalt mixture is provided around the portion centered on the tear so as to cover with an arbitrary width and thickness. The water shielding layer provided is repaired so that the water shielding layer is continuous with the existing water shielding layer.

  According to the invention of claim 4, when repairing a location where a defect occurs in the water shielding layer, a construction frame is arranged and fixed around a tear of the sheet-like water shielding body or the multilayer water shielding treatment layer, and the construction Construction of asphalt repair layer provided in close contact with the upper surface of the water-impervious treatment layer by constructing an asphalt mixture in the space surrounded by the frame, and as a partition plate provided on the outer surface of the construction frame, When the asphalt mixture is injected into the construction frame body, the liquid material heated with water from the holes provided in the partition plate of the construction frame body Or, it is constructed while discharging gas.

  As mentioned above, the water-impervious treatment layer is composed of water-impervious members with different materials and properties, and is constructed as an integrated (continuous) water-impervious treatment layer. Can be exhibited well. Also, it exhibits sufficient water-imperviousness against the water pressure due to retained water added from the landfill side, and resists well against impact when penetrating the dumped material and pressing action by the stacked dumped material A water-impervious treatment layer can be constructed.

  In addition, by constructing a corner connection layer with respect to the corner of the water-impervious treatment layer, a sheet-like water impervious body that is likely to be unstable in water impermeability, and a connection portion of the water-impervious treatment layer having other structures. It is possible to reinforce the water barrier property, and the corner connecting layer can be easily constructed by placing an asphalt mixture on the upper and lower surfaces of the connecting portion.

  Furthermore, when a tear is formed in the water-impervious treatment layer, the water-imperviousness of the water-impervious treatment layer can be maintained well by constructing an asphalt repair layer that covers the tear widely. Therefore, the performance of the asphalt repair layer can be maintained over a long period of time by removing the construction frame from the corner connection layer and the asphalt repair layer without removing the work frame. Even in the water treatment layer, the water shielding property can be maintained well.

  With the configuration as described above, in the present invention, the water shielding action by the water shielding sheet and the asphalt mixture layer formed with a predetermined thickness are overlapped to form a water shielding treatment layer of two or three layers. The water members can be stacked and configured as an integrated water-impervious treatment layer, and the water-impervious property at the partition revetment in the landfill can be exhibited well.

  Further, when constructing a water shielding layer by placing the asphalt and the mixture, a mastic layer formed to have a predetermined thickness by constructing the water shielding layer so as to include a net-like member; The sheet can be doubled or tripled to form a water-impervious treatment layer, and the water-imperviousness can be exhibited well. And the water-impervious treatment layer that exhibits sufficient water-imperviousness against the water pressure applied from the open sea side and can resist well against the impact when the waste is dropped and the pressing action by the dumped material, etc. be able to.

  In addition to the above-mentioned effects, by constructing a corner connection layer for the corner of the water-impervious treatment layer, the water-imperviousness is strengthened at the connection portion of the sheet for water-impervious sheet which is likely to be unstable. It is possible to construct the corner connecting layer easily. When constructing the corner connection layer, the asphalt mixture is placed in a predetermined thickness so as to cover the connection portion of the water shielding sheet, or the end portion of the water shielding sheet is placed between the asphalt mixture. It can comprise in the state inserted | pinched and can give reliability to water-insulating performance.

  In addition, when a tear is formed in the water-impervious treatment layer, the water-impervious treatment layer is well maintained by constructing an asphalt repair layer that covers the periphery of the tear at the center. Can be made. And, with respect to the asphalt repair layer, by integrally installing without removing the work frame, the performance of the asphalt repair layer can be maintained over a long period of time, especially in the water-impervious treatment layer in which only a thin sheet is arranged However, the water barrier property can be maintained well.

It is explanatory drawing which shows the general structure of a revetment. It is explanatory drawing which shows the structure of the corner | angular part of the revetment of FIG. It is explanatory drawing of the example which comprises a water-impervious treatment layer by the sheet | seat for water shielding, and an asphalt layer. It is explanatory drawing of the combination opposite to FIG. It is explanatory drawing of the example which comprises a water-impervious layer by the three-layer water-impervious member. It is explanatory drawing of the water-impervious treatment layer of the combination different from FIG. It is explanatory drawing of the corner | angular part connection layer provided in the corner | angular part of a revetment foundation. It is explanatory drawing of the construction frame body combined with the face part connection layer of FIG. It is explanatory drawing of the connection process layer of the sheet-like water shielding body formed in a corner | angular part. It is explanatory drawing of the example of the connection process layer different from FIG. It is explanatory drawing of the state in which the tear was formed in the water-impervious treatment layer. It is explanatory drawing of the construction frame used for construction of an asphalt repair layer. It is a perspective view which expands and shows a part of construction frame. It is explanatory drawing of the example of installation of a construction frame. It is explanatory drawing of the other installation example of a construction frame. It is explanatory drawing which shows the structure of a masonry bank. It is explanatory drawing of the structure which combined the partition wall with the revetment of FIG. It is explanatory drawing which shows the structure of another example of a bank protection. It is explanatory drawing of the example of the revetment comprised with a some partition wall.

  In accordance with the example shown in the drawings, the water-impervious structure of the landfill revetment in which the multilayered water-impervious members of the present invention are stacked will be described. The example shown in FIG. 1 shows a case where a general landfill revetment is configured using caisson, but an artificial island constructed in the same manner as the landfill revetment can also be targeted. When constructing the revetment, it is constructed as an improved ground 7 in which ground improvement work has been performed on the ground in the caisson construction area of the submarine ground 6, and stones are stacked on the improved ground 7 so that a predetermined height and width are obtained. The caisson 2 is installed on the revetment foundation 5 by the foundation rubble, and the landfill revetment 1 is constructed.

  Then, the landfill 8 is constructed by dumping waste in the area delimited by the landfill revetment 1. In order to contain the harmful substances leached from the waste dumped in the landfill 8 and prevent the harmful substances from flowing out to the open sea, a partition member 3a composed of a rubber cylinder between the caissons 2, 3b is disposed, and a packed bed 3c of asphalt mixture is provided between the partition members 3a and 3b to construct the water shielding part 3 as a caisson partition.

  In addition to constructing the revetment foundation 5 and building an integrated landfill revetment 1 by placing ready-made structures such as caisson, stones available in relatively shallow waters or nearby When a revetment foundation can be constructed using a large amount, it is possible to construct a revetment using only the revetment foundation without using caisson. Moreover, it is also possible to construct a revetment by constructing a large L-shaped block or the like on a revetment foundation instead of the caisson.

  And the water-impervious treatment layer having the structure described below can be applied to a revetment constructed by combining the caisson and the L-shaped block on a revetment foundation or a revetment using only a revetment foundation. In addition, even when the revetment for constructing the water-impervious treatment layer revetment is a revetment that surrounds a construction area for an artificial island or a submarine ground, it is possible to apply a revetment structure for a revetment described below.

  A water-impervious treatment layer 10 is constructed on the inner surface side of the reclaimed land of the revetment foundation 5 and a predetermined section of the seabed ground 6 so that no seawater flows through the water-impervious treatment layer 10 and the seabed ground 6. Such processing is performed. And with respect to the inland side divided by the revetment, the water-impervious treatment layer 10 becomes unstable due to the pressure of seawater due to tidal flow on the outside sea side or the pressure of water accumulated inside the landfill. In order to prevent this, the upper surface protective layer 9 is constructed.

  The upper surface protective layer 9 is made of an inexpensive material that is easily available such as sand, so that the water-impervious treatment layer is not lifted by the tidal fluctuation pressure on the front surface or broken by the impact of dropping the landfill material. It is possible to secure the water shielding performance by the water shielding treatment layer.

  The example shown in FIG. 2 shows an example in which the landfill revetment 1 is connected so as to intersect at right angles in a plan view or is constructed with a certain angle. A large number of caissons 2, 2,... Are arranged in a row on the foundation 5, and a water shielding part 3 is constructed between each caisson 2, 2,. Is going.

  The inner surface of the landfill divided by the revetment is provided with a water-impervious treatment layer 10 to be described later. When the water-impervious treatment layer 10 is disposed along the straight line portion, Laying can be done easily, but at the part where the straight revetment is connected at a predetermined angle (hereinafter referred to as “corner part”), there is a problem that the water shielding sheet cannot be easily connected. is there. Therefore, the corner connection layer 15 is applied to the corner portion 4 of the revetment after the water-impervious treatment layer 10 is constructed, so that the water shielding performance can be ensured.

  FIGS. 3 to 6 illustrate the structure of the water-impervious treatment layer 10, but in this embodiment, only one sheet for water-impervious sheet is used, as in the conventional water-impervious method. Alternatively, instead of laying two sheets together, a case is described in which a water-impervious sheet and an asphalt layer are stacked to form a water-impervious treatment layer with improved reliability of water-impervious performance.

  First, in the example illustrated in FIG. 3, a water-impervious sheet 11 is laid over a predetermined range of the upper surface and the slope part of the revetment foundation 5 and the seabed ground 6, and the sheet-impervious sheet 11 is connected to the sheet connection part. In the same manner as in the case of the conventional water shielding sheet 11, a connection process is performed so as to exhibit water shielding. An asphalt layer 12 is constructed on the water shielding sheet 11 by placing an asphalt mixture with a predetermined thickness. The asphalt layer 12 is configured so as to have a thickness that can satisfactorily exhibit water shielding between the landfill 8 and the open ocean. For example, the asphalt layer 12 has a thickness of about 5 to 10 cm. Install to.

  When the asphalt mixture is applied, if the surface of the water-impervious sheet 11 is smooth, a treatment such as a treatment for providing unevenness is performed in advance so that the placed mastic is along the slope. Can be prevented from flowing down. Moreover, when constructing the asphalt layer 12 on the slope portion of the revetment foundation, asphalt blocks or mat members are arranged at predetermined intervals along the slope, and the placed asphalt mixture is made small. It is also possible to use a means for partitioning into compartments and coating the asphalt mixture integrally with a predetermined thickness thereon.

  Further, when the asphalt layer 12 is constructed, the surface of the water shielding sheet 11 in contact with the asphalt mixture is subjected to a treatment that allows asphalt to adhere, and the placed asphalt mixture is applied to the water shielding sheet 11. It can be formed in an integral layer. In addition, in the case where the water-impervious sheet 11 is configured as a composite sheet in which a sheet member having water-impervious properties and a nonwoven fabric or the like are integrated, the asphalt layer 12 is placed to integrate the two layers to prevent water The treatment layer 10 can be configured, and water shielding can be ensured.

  In the water-impervious treatment layer 10 constructed by overlapping the water-impervious sheet 11 and the asphalt layer 12 as described above, the water-impervious sheet 11 is conventionally made of rubber, vinyl chloride, polyethylene, polypropylene, or the like. It is composed of a rubber / plastic material that is used as a water-impervious sheet for landfills, and has a thickness of 1 to 5 mm.

  And when laying the water-impervious sheet 11 on the surface of the revetment foundation 5, by arranging small stones or the like on the surface of the revetment foundation 5 so that the unevenness of the surface of the revetment foundation 5 is as small as possible. When the water shielding sheet 11 is laid, it is possible to prevent an accident that the portion hitting the stone protrusion is damaged. The asphalt layer 12 constructed on the water-impervious sheet 11 can form a water-impervious layer made of asphalt of any thickness by filling the irregularities even if the surface of the water-impervious sheet 11 is uneven. it can.

  In FIG. 4, an asphalt mixture is cast with a predetermined thickness on the surface of the revetment foundation 5 to construct an asphalt layer 12, and a water shielding sheet 11 is laid on the surface of the asphalt layer 12. The case where the water-impervious treatment layer 10a is constructed is shown. In the water-impervious treatment layer 10a, an asphalt mixture is cast on the surface of the revetment foundation 5 to construct an asphalt layer 12 having a predetermined thickness, and the surface is formed as a smooth surface.

  Then, by laying the water shielding sheet 11 on the asphalt layer 12, the water shielding sheet 11 is attached to the surface of the asphalt layer, and an integrated water shielding treatment layer 10a is constructed. It is possible to satisfactorily exert the water shielding effect in the water shielding treatment layer in which the two layers are stacked.

  The example shown in FIGS. 5 and 6 shows a case where three layers of water-impervious members are laid on top of each other to construct integrated water-impervious treatment layers 10b and 10c. In the example shown in FIG. A water-impervious sheet 11a is further stacked on the water-impervious treatment layer 10 to constitute a water-impervious treatment layer 10b. As described above, laying the water-impervious sheet 11 on the surface of the revetment foundation 5 is the additional construction of the water-impervious sheet 11a after the construction of the water-impervious treatment layer 10 of FIG. Therefore, the construction of the water shielding sheet 11a can be easily performed.

  In the example shown in FIG. 6, the three water-impervious layers sandwiching the water-impervious sheet 11 are integrated by additionally constructing the asphalt layer 12 a with respect to the water-impervious treatment layer 10 a in FIG. 4. Thus, a water shielding layer 10c is configured. As shown in FIGS. 5 and 6, when the three layers of the water shielding layer are stacked, the surface of the water shielding sheet in contact with the asphalt layer is subjected to a surface treatment that can exhibit affinity with the asphalt. This is effective in integrating the water-impervious treatment layer. In addition, when placing an asphalt layer, the asphalt mixture may not be applied all at once, but may be placed in multiple times to prevent the asphalt mixture from flowing down along the slope. It is possible to build an asphalt layer.

  In addition, when manufacturing the sheet for water-imperviousness at the factory, it is configured as having a width of 2 to 5 m, connecting the sheet for water-impervious at the construction site to form a wide sheet for water-imperviousness, Therefore, it is necessary to construct a water shielding layer over a predetermined range of the surface of 5 and the surface of the improved ground 7. When connecting the water-impervious sheet, it is possible to connect by using an adhesive, a connecting means by heat fusion, a double-sided tape, etc., as conventionally used for connecting a water-impervious sheet. .

  5 and 6, when constructing a three-layer water-impervious treatment layer, an asphalt mat is used instead of constructing a water-impervious layer having a predetermined thickness using an asphalt mixture. Can also be constructed. When the asphalt mat is disposed in combination with a water shielding sheet, a connection process is performed so that the seam of the asphalt mat can be connected using any connecting means and filled with an asphalt mixture or the like to exhibit water shielding. It is good to be able to ensure the water impermeability by the same mat | matte as a sheet | seat by performing.

  As described above, when a water-impervious treatment layer is constructed on the surface of the revetment foundation 5, a water-impervious sheet connection portion is formed at the corner of the revetment foundation 5, and the water-impervious sheet connection portion. In many cases, it is difficult to ensure the water shielding property. Therefore, in this embodiment, as shown in FIG. 7, the corner connection layer 15 is constructed in a wide range to cover the corner 4, and the protection means for the corner 4 of the straight revetment foundations 5, 5. Can be built.

  In the example shown in FIG. 7, for example, an asphalt mixture is placed on each of the slope portion 5 a of the revetment foundation, the upper surface 5 b, and the ground surface 6, and the top end portion 16 and the slope portion 17 are formed at once. There arises a problem that the lower surface portion 18 cannot be constructed integrally. That is, when the asphalt mixture is placed on the slope portion 17 of the corner connection layer 15, there is a problem that the asphalt mixture flows down along the slope.

  Although the problem of the asphalt mixture flowing down along the slope of the revetment foundation is a major construction problem that also occurs when constructing the revetment impermeable treatment layer, the asphalt mixture is applied to the slope portion of the revetment foundation. When installing, since it constructs on a very wide inclined surface, it is easy to use a means for preventing the asphalt mixture from flowing down. However, when forming the connection portion of the water shielding layer with respect to the corner portion 4, it is required to form a more reliable water shielding treatment layer than other linear portions. It is thought that it is good to construct the corner connection layer 15 integrated with the construction frame by arranging the construction frame 20 as shown, filling the construction frame 20 with the asphalt mixture and filling it. .

  The construction frame body 20 shown in FIG. 8 is configured as a frame body in which the upper frame portion 21, the lower frame portion 22, the side frame portion 23, and the slope frame portion 24 are combined using H-shaped steel or the like. And it is comprised as a bowl-shaped thing which provided the perforated member like the metal mesh 26 in the lower surface. The construction frame body 20 is arranged corresponding to the slope portion 17 of the corner connection layer 15 shown in FIG. 7, forms a slope frame portion 24 corresponding to the corner portion 4 of the revetment foundation, and the top end portion. The upper frame portion 21 is positioned so as to correspond to 16.

  In addition, the construction frame body configured symmetrically with the construction frame body 20 is arranged, and the corner connection layer 15 can be constructed of the asphalt mixture by the two construction frame bodies. Thick asphalt mixture layers can be constructed. In addition, since the said construction frame 20 has a property substantially the same as the construction frame used for construction of the asphalt repair layer mentioned later, the detailed structure is a term of the construction frame after FIG. explain.

  When the corner connection layer is constructed by combining the two construction frame bodies 20, the upper surface of the construction frame body 20 and the slope portions corresponding to the slope frame portion 24 are configured as opening surfaces without providing a metal mesh. The asphalt mixture can be cast as an integral piece between the two construction frames arranged with the corner 4 interposed therebetween.

  When constructing the corner connecting layer 15, first, the lower surface 18 is constructed with a predetermined thickness on the ground 6, and the slope of the revetment foundation is supported by the end of the lower surface 18. The construction frame body 20 is set at the corner of the asphalt mixture, and the asphalt mixture is placed toward the inside of the construction frame body 20. After the asphalt mixture is filled in the construction frame body 20, a water-blocking protection member integrated as a corner connection layer 15 by constructing the top end portion 16 in a predetermined range on the upper surface of the revetment foundation 5. Can be built.

  The example shown in FIG. 9 is an explanatory view showing the structure when the corner connection layer is constructed in a cross section, and the water-impervious sheets 11, 11 of the water-impervious treatment layers on both sides are close to the revetment foundation 5. The asphalt mixture 28 is cast with a predetermined thickness so as to extend over a predetermined range of the upper part of the water-impervious sheet. And the corner | angular part connection layer 15 integrated with the water shielding sheet | seat can be formed by constructing | assembling the corner | angular part connection layer 15 by the layer of the said asphalt mixture 28 integrally with the frame as shown in the said FIG. it can.

  The example shown in FIG. 10 shows a countermeasure when it is assumed that the corner connection layer is constructed by placing an asphalt mixture on a water shielding sheet and the reliability of the water shielding performance is poor. The case where the end portion of the water shielding sheet is constructed so as to be inserted between the upper and lower asphalt layers is shown.

  In the example of the corner connection layer 15a shown in FIG. 10, first, the lower asphalt mixture 28a is first cast to a predetermined thickness on the corner portion 4 of the revetment foundation to eliminate the unevenness on the surface of the revetment foundation. To do. Next, the end portions of the water-impervious treatment layer sheets 11 and 11 are arranged as close as possible on the lower asphalt mixture layer, and the both sides of the lower asphalt mixture layer 28a are arranged on both sides. The water shielding sheets 11 and 11 of the water shielding treatment layer are disposed in close contact with each other.

  Next, an asphalt mixture is cast over a predetermined area on the water shielding sheet to construct the upper layer 28 with a predetermined thickness. By constructing the upper layer 28 of the asphalt mixture, it is integrated with the end portion of the water shielding sheet inserted between the upper and lower layers 28, 28a formed of the asphalt mixture, and reliable in water shielding performance. The corner | angular part connection layer 15a which can exhibit property can be constructed | assembled.

  When constructing the upper asphalt mixture layer 28, the asphalt mixture is cast using the construction frame as shown in FIG. 8 so that the upper layer has a constant thickness. Thus, it is possible to hold the asphalt layer so that the thickness of the asphalt layer does not change even after a long time has passed since the casting.

  As shown in each of the above examples, even when a water shielding layer was constructed in a state where sheets, asphalt mat, asphalt mixture layer, etc. were polymerized, some problems occurred during construction, It is assumed that the water-impervious treatment layer is damaged or a crack or the like is formed, resulting in a problem that the water-impervious property cannot be exhibited well. Therefore, when a tear or the like occurs in the water-impervious treatment layer as described above, it is conceivable to lay an asphalt mat member as shown in FIG. 11 so as to cover the damaged portion.

  However, if the place where the asphalt mat-like member is additionally installed is a layer of only the sheet for water shielding, the asphalt mat-like member is simply laid and placed between the sheets and the asphalt. In some cases, gaps are likely to occur, and sufficient water shielding performance may not be exhibited. In order to solve the problems as described above, as described below, a mat-like member constructed with a predetermined thickness of asphalt mixture is constructed, and repair of the tear of the water shielding layer and water shielding treatment are performed. It is necessary to do.

  The water-impervious treatment layer of the landfill revetment shown in each of the above examples is applied to a water-impervious treatment layer made of a sheet-like water-impervious body and solidified soil, in addition to the case of being composed of a sheet-like impermeable body and an asphalt mixture. Is possible. As the solidified soil, for example, a soil layer mixed with cement is coated to a predetermined thickness, and the soil layer and the water shielding sheet are overlapped for construction. Moreover, like the above-mentioned solidified soil, there may be a case where a layer of viscous soil is applied with a predetermined thickness and a water shielding sheet is overlapped.

  Furthermore, in addition to a water-impervious treatment layer in which a water-impervious sheet and a protective mat are stacked, or a structure in which a plurality of sheet-shaped water-impervious bodies are stacked, a protective mat, solidified soil, viscous soil or asphalt mixture, It is also possible to target water-insulating layers each having a water-impervious property as a single layer.

  Even in the water-impervious treatment layer having the above-described configuration, it is necessary to repair a damaged portion when forming a sheet or a corner connection portion of the water-impervious treatment layer, and in particular, soil is used as a main component. When constructing a water treatment layer, cracks are likely to be formed due to the consolidation of soil or the inclusion of water. Therefore, when repairing such a damaged portion, it is natural that the water shielding treatment can be performed as in the case of the water shielding layer composed of the water shielding sheet and the asphalt mixture layer.

  In the example described below in FIG. 12, after the water-impervious treatment layer 10 is constructed on the surface of the revetment foundation 5, an accident such as a drop of a large stone or a lump such as a lump occurs, 10 shows countermeasures in the case where a tear 14 is formed in a part of 10. When a rift is formed in the water-impervious treatment layer 10, there arises a problem that seawater circulates inside and outside the revetment through the rift, and it is necessary to close the rift.

Therefore, for example, another water shielding sheet or asphalt mat is overlaid on the water shielding treatment layer on which the asphalt mat or the water shielding sheet is laid, for example, in the state shown in FIG. It is conceivable to perform a process of closing the door.
However, when an asphalt mat or a water shielding sheet is laid directly on the water-impervious treatment layer 10, it is difficult to provide water-tightness on the water-impervious treatment layer that has already been constructed. Since it is a work, it will be forced to do very troublesome construction.

  In addition, it is considered that it is relatively easy to construct a repair layer by laying an asphalt mixture at a site where a tear has occurred in the water shielding layer. However, if the position where the zinc machine rift is formed is a slope, the asphalt mixture flows along the slope and gradually flows down the slope due to the characteristics of the asphalt over time. There are concerns about problems peculiar to asphalt, such as the change in height. And it is assumed that the state which constructed | assembled the asphalt repair layer of predetermined thickness on the water-impervious treatment layer cannot be maintained over a long period of time.

  Therefore, in the present invention, as shown in FIG. 12, the construction frame 31 is arranged with a large area around the portion where the tear 14 is formed, and the asphalt mixture is constructed in the construction frame 31. However, a means for constructing the asphalt repair layer 30 having a certain thickness and closing the slit is used. The construction frame 31 used for constructing the asphalt repair layer 30 can be configured as shown in FIGS. 13 and 14 and has a height of 20 to 30 cm. It can be arbitrarily formed according to.

  The lower frame member 35 for placing and positioning the construction frame body 31 on the existing water-impervious treatment layer 10 is formed by arranging a shape steel or an H-shaped steel on the lower side and both sides, thereby providing a water impermeable treatment. A surface corresponding to the layer is opened. Further, each of the upper frame member 32, the bottom frame member 36, and the side frame of the construction frame 31 is made of a vertical frame steel material or a horizontal frame steel material 34 arranged at a predetermined interval, and a shape steel or other thick and heavy steel material. It is composed of the framework members of the above, and stability in a state where it is installed on the water-impervious treatment layer is enhanced.

  A mesh member such as a net-like member or a porous plate-like member that can prevent leakage of the asphalt mixture and allows air and water to flow out from the frame configured by the frame member. The top plate 37, the side plate 38, and the bottom plate 39 are provided. As the mesh member, for example, as in the case of the construction frame 20, a metal material such as a fine wire mesh or punch metal, or a plastic woven fabric or nonwoven fabric, or a woven fabric and a metal mesh are stacked. A composite sheet material or the like can be used.

  Further, an iron plate or the like can be attached between the frames to form a box having an upper surface and a lower surface opened, a gap can be formed between the iron plates at a predetermined interval, and a perforated member such as a wire mesh can be disposed. . Then, by constructing the construction frame 31 as described above, when the construction frame 31 is arranged on the water-impervious treatment layer 10 and the asphalt mixture is poured from the upper opening, it is heated by the high-temperature asphalt mixture. Since the generated water and the water vapor generated by the heating leak out to the outside from the perforated portion and are eliminated, no voids or the like are generated in the applied asphalt mixture.

  As shown in FIG. 14, the construction frame body 31 configured as described above can be installed at a predetermined position of the water-impervious treatment layer 10 to cope with the construction of the asphalt repair layer 30. In a state where the body 31 is installed on a slope, the body 31 is configured not to move under the influence of waves in water. In order to install and stabilize the construction frame 31 on the slope portion of the water-impervious treatment layer, as shown in the figure, a rubble layer is constructed in a predetermined range above the slope and the construction frame. When the asphalt mixture is constructed, the construction frame 31 is fixed so as not to move by the flow pressure.

  Then, the asphalt mixture is injected from the upper opening of the construction frame 31 using a hose or the like so as to fill the internal space of the construction frame. At that time, the construction frame is filled inside. While removing water through the mesh member, the inside is filled with the asphalt mixture to form the asphalt repair layer 30.

  As described above, the construction frame 31 is filled with the asphalt mixture, and the asphalt repair layer 30 is formed integrally with the construction frame 31 so that the asphalt mixture having a high fluidity can be It is in a state where it is stuck to the surface without any gaps, and exerts the effect of completely closing the tear.

  However, if the construction frame 31 is removed after the asphalt repair layer 30 is constructed with a predetermined thickness, the asphalt mixture retains fluidity for a long period of time. It is estimated that it will be difficult to maintain over time.

  Therefore, when the asphalt repair layer 30 is configured using the construction frame 31, if the construction frame is left without being removed, the thickness of the asphalt repair layer 30 can be maintained by the construction frame 31, The water shielding performance against the tear can be exhibited well.

  The example shown in FIG. 15 shows another example of the fixing method when the construction frame 31 is installed on the slope portion. For example, when the tear is relatively small, or the lower portion is rubbed at the upper portion of the slope. When it is difficult to hold down, it is installed by using a hanging member 40 such as a wire from the fixing member at the upper part of the slope. When such a hanging means is used, the construction frame 31 is formed with a large weight so as not to be lifted off the slope by the construction of the asphalt mixture.

  Moreover, the said hanging tool 40 can arrange | position many wires etc. in order to prevent a movement of a construction frame body during asphalt repair layer construction. As described above, when the asphalt repair layer 30 is applied to the rift, the waste is dropped as early as possible to such a repaired place, and the pressure action is exerted by the weight of the waste. As a matter of course, it is possible to easily fix the construction frame body and to contribute to the action of stabilizing the asphalt repair layer 30 additionally constructed.

  In addition, when constructing the asphalt mixture with the construction frame 31 fixedly disposed on the slope portion, pipes that have been used for construction in the sea can be used, but in addition to asphalt It is also possible to use a bucket configured in correspondence. The asphalt repair layer constructed for repairing the fissure may be an improved solidified soil or clay when the water-impervious treatment layer is made of asphalt material, or is made up of only plastic or rubber sheets. It can be used effectively even for the one configured using only.

  When the water-impervious treatment layer is composed only of sheets, the construction of the water-impervious treatment layer is easy, but there is a problem that the water-impervious property is easily impaired by a small impact. Even for such a thin water-impervious treatment layer, it is difficult to attach a similar sheet without gaps, and it is difficult to maintain the reliability of the repaired portion. For such a problem, providing an asphalt repair layer as shown in the above embodiment is easy to implement, and can be easily dealt with by simply placing an asphalt mixture by placing a construction frame. It becomes possible.

  The landfill revetment of the waste disposal site as described above or the revetment for partitioning the artificial island, as shown in FIG. 1, is constructed by installing caisson on the revetment foundation 5 as shown in FIG. It can be configured as shown in each of FIGS. The landfill revetment 1a shown in FIG. 16 is constructed as a stone revetment 50 by stacking stones, and can be constructed without using caissons or the like when large stones are available from the vicinity of the construction site.

  In order to construct the high masonry revetment 50 as the landfill revetment 1a, a step portion is formed for each predetermined height so that the slope of the masonry revetment 50 can be protected. On the slope on the landfill 8 side of the stone masonry revetment 50, a water-impervious treatment layer 10a that is a composite of a water-impervious sheet and an asphalt mixture layer can be arranged to construct a highly reliable water-impervious treatment.

  Also in the water-impervious treatment layer 10a provided on the landfill 8 side of the landfill revetment 1a, the construction of the corner connection layer shown in FIG. 7 and the construction of the asphalt repair layer for the damaged portion can be performed. In addition, when constructing the corner connection layer, asphalt mastic construction using a construction frame body is performed on the slope portion and the horizontal portion of the plurality of step portions, and for the horizontal portion. Asphalt mastic can be applied to a predetermined thickness and integrated with the slope portion.

  In FIG. 17, in addition to the landfill revetment in which caisson is installed on the revetment foundation as shown in FIG. 1, sheet piles are continuously arranged in a row on the landfill 8 side and driven through the water shielding means. An example is shown in which the inner partition wall 55 provided is constructed, and the partition wall 55 and the caisson 2 are connected by a connecting member 56 such as a tie rod to construct a strong composite landfill revetment 10b.

  In the landfill revetment 17b of FIG. 17, the caisson 2 constructed outside the landfill 8 is placed on a basic revetment constructed at a predetermined height with concrete or steel caisson constructed on land, The configuration is the same as in the case of the landfill revetment 1 in FIG. The composite landfill revetment 1b is constructed in accordance with the purpose for improving the reliability of the landfill revetment in the deep sea area.

  And the water-impervious treatment layer 10b for shutting off the landfill 8 from the open sea is laid over a predetermined range on the inner side of the partition wall 55 by the sheet pile row and on the seabed ground 6, but the water-impervious treatment In the layer 10b, even if it is possible to arrange a sheet-shaped water shielding member along the vertical plane, it is difficult to construct a water shielding treatment layer in which the asphalt mixture is placed and combined with the sheet. is there. Therefore, a water-impervious treatment layer is formed on the submarine ground surface by using a sheet and asphalt mixture. As the water-impervious treatment layer disposed along the vertical surface of the partition wall 55, a plurality of water-impervious layers are used. Sheets can be stacked.

  In the example of the landfill revetment 1c shown in FIG. 18, steel pipe piles are placed in a row, partition walls 60 constructed through water shielding means are arranged on the open sea side, and a stone stack 65 is placed inside the partition walls 60. Is building. Further, a retaining column 61 is constructed inside a predetermined distance from the partition wall 60, and the partition wall 60 and the retaining column 61 are connected by a connecting member 62. The constraining column 61 is constructed by placing a column member such as H-shaped steel, and the connecting member 62 may be provided with any connecting means in addition to the tie rod and the like, similarly to the connecting member 56 of FIG. it can.

  The stone stack 65 built inside the partition wall 60 by the steel pipe pile row is constructed by stacking stones available in the vicinity, and stones having a smaller diameter can be used than when building the revetment foundation. . Further, a water-impervious treatment layer 10c is disposed on the slope portion on the landfill side of the stone stack, and the water-impervious treatment layer 10c is used for water-impervious as in the examples shown in FIGS. It is possible to provide a water-impervious treatment layer in which a sheet and an asphalt mixture layer are combined.

  A landfill revetment 1d shown in FIG. 19 is formed by placing steel pipe piles or the like in two stages at predetermined intervals, and arranging partition walls 60, 60a provided through water shielding means. They are connected by a connecting member 62. The partition walls 60, 60a are filled with waste having a stable property that does not exude landfill soil, concrete pieces, and other harmful substances.

  On the inner surface of the landfill revetment 1d, a water-impervious treatment layer 10d is laid along the wall, and the water-impervious treatment layer is extended and extended over a predetermined range of the seabed ground. ing. In the water-impervious treatment layer 10d, as the water-impervious member extending along the vertical wall surface of the partition wall 60a, a plurality of sheet-like water-impervious members can be laid on top of the seabed ground 6. Can be provided by stacking a sheet-like member and a layer of asphalt mixture.

  As shown in FIGS. 17 to 19, when the partition wall is constructed by the sheet pile row or the steel pipe pile row, water leaks out at the joint portion of the sheet pile or the steel pipe pile constituting the partition wall. Is inevitable. In other words, as in the case of a masonry foundation, since water flows between the inside of the partitioned landfill and the outside sea, the partition wall and the like are subjected to a water shielding treatment. Is required. Therefore, in each embodiment, a water shielding sheet is disposed on a partition wall, a sheet pile row, or the like constructed substantially vertically so that water can be prevented from flowing into and out of the landfill.

  Even when a sheet-shaped water shielding member is laid on a vertical wall member such as a partition wall such as the sheet pile or steel pipe pile, the water shielding sheet may be damaged due to an impact. is there. When the vertically laid sheet or the like is damaged, another water shielding sheet is laid on the damaged part to perform the water shielding treatment, or the vertical structure configured as shown in FIG. The damaged part can be repaired by using a means such as placing a simple frame body on the damaged part and placing an asphalt mixture. In addition, damage to the water-impervious treatment layer laid on the seabed ground can be easily repaired by placing the asphalt mixture in a predetermined range, and the reliability of the water-impervious treatment layer can be improved. Can be improved.

  In addition, when the slope angle of the stone masonry revetment is large, it may be very difficult to construct a water shielding layer with a predetermined thickness on the slope simply by placing an asphalt mixture. . Therefore, the construction frame body as shown in each of the above embodiments is arranged at arbitrary intervals along the slope, and then a means such as constructing a fixed impermeable layer by placing an asphalt mixture is used. It is also possible, and an asphalt mixture can be placed later in the gap between the construction frames to construct a water-impervious treatment layer without a gap.

  Moreover, it is natural that the reliability of the water-impervious treatment layer can be improved by arranging the water-impervious sheet and the like in combination with the placement of the asphalt mixture. Furthermore, instead of directly placing the asphalt mixture, the asphalt mat is disposed so as to overlap the sheet for water shielding, and the water shielding treatment is performed between the seams of the asphalt mat, thereby providing a highly reliable water shielding treatment. You can also build layers.

1 landfill revetment, 2 caisson, 5 revetment foundation, 10 impermeable layer,
11 sheet for water shielding, 12 asphalt layer, 14 tear,
15 corner connection layer, 17 slope part, 20 construction frame body, 24 slope frame part, 26 wire mesh, 30 asphalt repair layer, 31 construction frame body,
32 upper frame member, 35 lower frame member, 37 top plate, 39 bottom plate,
40 Suspension, 42 Rubble Layer, 50 Masonry Revetment, 55 Partition Wall,
56 connecting members, 60 partition walls.

Claims (4)

On the masonry mound that is built around the landfill, a prefabricated structure such as caisson and L-shaped blocks are lined up and constructed to partition the open sea and landfill.
In the reclamation revetment where the seabed mound of the revetment and the connection part of the structure do not allow water to pass through, and the seabed ground and the revetment component members as an integral impermeable layer,
A sheet-shaped impermeable body is laid over a predetermined range of both the surface of the landfill side and the open sea side of the landfill revetment or one side of the sea side and the seabed ground for constructing the revetment structure, or the sheet-like Install one of the water-impervious treatment layers of the water-impervious layer and the layer of the asphalt mixture to provide a water-impervious treatment layer,
When a defect occurs in the water-impervious treatment layer of the landfill revetment, a sheet-like water-impervious body is provided so as to cover with an arbitrary width and thickness around a portion centered on the fissure. Or add a water-impervious treatment layer with asphalt mixture,
A repair method for the impermeable layer of a landfill revetment, wherein the additional impermeable layer is repaired so that the impermeable layer is continuous with an existing impermeable layer. When a row of structures provided so as to divide the landfill from the open sea is connected at a predetermined angle and a defect such as a tear occurs in the water-impervious treatment layer, the 2 With a water shielding layer provided so as to cover two structures, a sheet-shaped water shielding body is overlaid within a predetermined range,
A layer of asphalt mixture is applied at a predetermined thickness so as to cover the area where the sheet-shaped impermeable body is overlaid with a predetermined area around the overlapped portion of the water-impervious body, and is provided on the structure of the revetment. The repair method for a water barrier layer of a landfill revetment according to claim 1, wherein the water barrier layer is repaired so as to be continuous with the water barrier layer. In addition to the water-impervious treatment layer at the connection part of the landfill revetment structure, when a defect such as a tear occurs in a part of the existing water-impervious treatment layer covering the revetment structure, Around the part centered on the rift, an additional water-impervious treatment layer with a sheet-like impervious body or asphalt mixture is provided so as to cover with an arbitrary width and thickness,
The repair method for a water shielding layer on a landfill revetment according to claim 2, wherein the additionally provided water shielding layer is repaired so as to become a water shielding treatment layer continuous with the existing water shielding layer. When repairing a location where a defect has occurred in the water shielding layer, the construction frame is arranged and fixed around the tear of the sheet-like water shielding body or the multilayer water shielding treatment layer, and is surrounded by the construction frame. While constructing an asphalt repair layer to be installed in close contact with the upper surface of the water-impervious treatment layer by constructing an asphalt mixture in the space,
As a partition plate provided on the outer surface of the construction frame, it is configured using a net-like member or a porous plate member,
When injecting an asphalt mixture into the construction frame, the construction is performed while discharging water and a heated liquid or gas from a hole provided in a partition plate of the construction frame. Item 3. Repair method for impermeable layer of landfill revetment according to item 3.

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