JP4223147B2 - Construction method for undersea structures - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a construction method for supporting and protecting a buried structure such as a pipeline that is excavated and buried by shallow excavation of the seabed or a submerged tunnel.
[0002]
[Prior art]
In power plants located on the coast, liquefied natural gas processing facilities, and factories that use seawater for cooling and heating, a large amount of seawater is used for cooling and heating. Is installed in the sea. The water supply and drainage pipes are arranged at the bottom of a groove formed by excavating the seabed ground to a predetermined depth and laid so as not to be exposed from the bottom of the sea. It is not to give.
[0003]
In the water discharge facility for discharging the thermal drainage of the thermal power plant, a submarine pipeline 1 as shown in FIGS. 9 and 10 is provided. It is composed of a radial pipe 2, a medium-diameter pipe 3 divided into a plurality of parts via a branching portion, and a plurality of small-diameter pipes 4 divided further. In the submarine pipeline 1, for example, the large diameter pipe 2 is formed with a pipe having a diameter of 4 m, the medium diameter pipe 3 is formed with a diameter of 3 m, and the small diameter pipe 4 is formed with a pipe having a diameter of 2 m. As shown in FIG. 10, a rising pipe 5 is arranged at the end of the small-diameter pipe 4 so that the warm drainage is discharged from a water outlet 6 arranged in a substantially horizontal direction. Then, by discharging a small amount of warm wastewater from the large number of water discharge ports 6... As shown as a water flow 7, the temperature of the seawater is not increased locally, and the warm wastewater is dispersed throughout the discharge area. Trying to get.
[0004]
When laying the submarine pipeline 1, as shown in FIG. 11, the excavation groove 10 is excavated to a predetermined depth from the seabed ground surface, the pipe P is laid through a support member, and the pipe P A lower support layer 11 is applied to the lower surface of the substrate. In addition, the upper part of the pipe is filled with earth and sand excavated from the sea bottom as an upper covering layer 12, and a protective rubble layer 13 is applied to the upper part of the pipe P with a predetermined thickness so as to be almost parallel to the sea bottom. Thus, the pipe is protected and the upper covering layer is prevented from being scoured.
[0005]
Also, when constructing buried structures such as submarine tunnels by submerging tunnel segments created on land in a trench excavated in the seabed, after the segment is installed in the groove, Support layer is built. The lower support layer is constructed by pushing sand or gravel into the gap between the bottom of the groove and the segment using water pressure or by injecting a fluid material such as mortar.
[0006]
[Problems to be solved by the invention]
However, when the pipeline of the submarine pipe is composed of a large-diameter pipe, the earth and sand dropped from both sides with respect to the portion directly below the pipe is simply dropped from the ship. There exists a problem that it accumulates like the layers 11 and 11a, and earth and sand are not completely filled into the part directly under a pipe. Moreover, when forming a support layer in the lower part of a wide segment such as a submarine tunnel, it is difficult to construct a support layer on the entire lower surface of the segment as compared to a pipe. That is, when injecting the material of the support layer from the side of the segment, it is very troublesome to pack gravel and sand into the deep part without any gaps, but good results cannot be expected. There are many.
[0007]
In order to solve the above-mentioned problem, for example, a means such that a lump of crushed stone or sand is ejected toward the lower surface of the pipe by a sand pump and the lower surface of the pipe is filled with crushed stone, or a vibrator for sand or the like is used. It is practiced to apply a vibration to cause fluidization so that no gap is generated. However, when using the method of filling the lower surface of the pipe with crushed stone by the pump, it is necessary for the diving worker to operate the crushed stone transport pipe on the seabed, and to send a sufficient amount of filler to the lower surface of the pipe. Thus, there remains a problem that it is difficult to construct the lower support layer. Furthermore, in order to construct the lower support layer as a support layer that can sufficiently cope with the weight of pipes and external forces such as vibration, the construction is not smoothly performed due to the influence of tidal currents. In addition, there is a problem that the construction cost of the lower support layer is increased. In addition, it is assumed that it is difficult to obtain reliability in the operation of the pipe support, and there are still problems that require many solutions to be applied to a general pipeline.
[0008]
The present invention solves the problem of the construction of the conventional submarine pipe as described above, and the asphalt mixture placed on the lower surface of the pipe can easily support the pipe, and an easy construction method is provided. It is intended to provide.
[0009]
[Means for Solving the Problems]
The present invention relates to a construction method for constructing a submarine structure by laying a buried structure in an excavation groove constructed by digging down from the seabed ground surface.
The invention of claim 1 is provided with a foundation support layer constructed by stacking stones with a predetermined thickness on the bottom of the excavation groove, and a support member for supporting an embedded structure on the foundation support layer. ,
In a state where an embedded structure is laid on the support member, an asphalt mixture is infiltrated and integrated between the stones of the base support layer, and further, so as to cover the base support layer and the embedded structure. The upper covering layer is constructed according to the seabed ground surface, and then the upper surface protection member is laid according to the seabed ground surface.
[0010]
In the invention of claim 2, when constructing the foundation support layer, partition members are arranged on both sides of the embedded structure via an arbitrary interval, and a stone layer is constructed between the partition members,
The asphalt mixture is constructed and constructed on the stone layer.
[0011]
The invention of claim 3 constructs the base support layer and the support member at a predetermined interval in the length direction of the bottom of the excavation groove,
Laying an embedded structure supported by the support member,
After the step of constructing the foundation support layer by constructing the asphalt mixture to a predetermined thickness on the bottom and side of the laid buried structure,
The top support layer and the buried structure are covered, and an upper covering layer is constructed according to the seabed ground surface.
[0013]
By using the construction method described above, the foundation support layer and support means of the support layer for submarine structures such as pipes and submerged tunnels can be carried out from the sea, reducing the burden on diving workers. be able to. In addition, when a support layer is constructed by placing an asphalt mixture in a layer of a lump like a crushed stone (hereinafter referred to as crushed stone or crushed stone), the asphalt mixture enters the gap between the crushed stones and is integrated. A support layer can be constructed, and the support action of a structure such as a pipe can be protected by a wide and thick layer, and the structure can be supported stably on the seabed ground. Furthermore, when the partition members are arranged at arbitrary intervals to define the width of the support layer, it becomes possible to protect the structure according to conditions such as the support strength of the ground, and laying the submarine pipeline It can be easily adapted to the sea area. And when arranging the upper surface protection material on the excavation groove, the earth and sand that have been backfilled are protected from scouring, and even if the upper covering layer on the structure is thin, the structure from the impact due to the fall of the anchor etc. And the stability of the submarine pipeline can be improved.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
The construction method of the seafloor buried structure of the present invention will be described according to the illustrated example. The submarine pipeline shown in the present embodiment is intended for, for example, pipelines for discharging the thermal drainage of thermal power plants as shown in FIGS. 9 and 10, and other pipelines laid on the seabed. However, in the description of the first embodiment of the present invention, the means for supporting the pipe will be mainly described as an example of the seabed buried structure inside the excavation groove provided by excavation on the seabed. . In the example shown in FIG. 1, a foundation support layer 21 is formed by using crushed stone, sand or the like with a predetermined thickness on the bottom surface of the excavation groove with respect to the excavation groove 20 constructed by excavating the seabed ground surface 8 to a predetermined depth. After the support member 27 is arranged on the upper surface of the basic support layer 21, a relatively small lump of crushed stone or the like is dropped from the ship and leveled, and the fluidity of the lump is large. The case where the support layer 22 is constructed by injecting an asphalt mixture is shown. In addition, after the support member for the pipe P is constructed by the support layer 22, the excavated earth and sand obtained from other places are transported to the laid pipe in the same manner as in the case of the conventional construction method, and the upper cover is covered. After constructing the layer 26 and constructing it at almost the same height as the seabed surface 8, laying a top protection material 28 such as an asphalt mat as a scour protection member to protect the pipe from the impact of dropping the anchor etc. To be able to.
[0015]
As the lump for constructing the support layer 22, for example, crushed stone, gravel, sand or the like having a size of about 5 to 10 cm can be used, and diving work after dropping the lump such as crushed stone from the ship. The worker corrects particularly large irregularities and portions that do not sufficiently enter the lower surface of the pipe. Then, the asphalt mixture 25 is driven from above the lump layer using a pipe, thereby constructing a crushed stone as a support layer solidified with the asphalt mixture. In the layer of asphalt mixture mixed with crushed stone, the cast asphalt mixture 25 is filled in a large gap of crushed stone and solidified, and a wide support layer can be constructed on the lower surface of the pipe P. Further, even when the support member 27 composed of a concrete block, an asphalt block, or the like is disposed on the foundation support layer 21, the asphalt mixture penetrates to the space where there is no support member. In the upper part, a thick supporting layer for supporting the pipe P can be constructed with a predetermined thickness.
[0016]
Furthermore, when a layer of asphalt mixture mixed with crushed stone is constructed to support the pipe P, the asphalt mixture placed later is not even if the crushed stone is not completely packed on the lower surface of the pipe. Since it flows into the lower surface and is filled, no gap is formed on the lower surface of the pipe. The pipe P arranged in the excavation groove can be integrally supported by an asphalt layer having a predetermined width and thickness, and even if any impact or vibration is applied to the submarine pipe, Since the support layer and the support layer are integrated, it is possible to prevent uneven vibration, weight, and the like from being imparted to the basic support layer.
[0017]
The example shown in FIG. 2 shows a case where the support layer 23 is constructed by using a large crushed stone as a lump and solidifying with an asphalt mixture that has entered the gaps between the lump. In this example, a large quarry stone of about 40 to 50 cm can be used for pipes with a diameter of 3 to 4 m. The asphalt mixture 25 is cast into the gap between the crushed stones. As described above, when the asphalt mixture is placed in a large crushed stone layer, since the asphalt is highly fluid, it enters the gap between the crushed stones, from above the foundation support layer 21 to a predetermined height, A layer of crushed stone solidified by asphalt is constructed as the support layer 23. In the support layer 23, the load, vibration, and the like applied from the pipe P to the support layer are uniformly transmitted to the support layer 23. However, the groove is removed from the basic support layer 21 through the stacked calculus. It is transmitted through a large crushed stone toward the bottom surface.
[0018]
The example shown in FIG. 3 shows a support layer forming method that reduces the amount of asphalt mixture used and enables the pipe to perform a supporting action in a good state. For the pipe P laid on the foundation support layer 21 in the excavation groove 20, the partition members 24 and 24a are arranged on the side portions thereof, and small crushed stones are packed between the partition member and the pipe. Asphalt mixture 25 is placed. When the support layer 22 is constructed for the section having a narrow width as described above, it is possible to construct a belt-like support layer having an arbitrary width and thickness with respect to the diameter of the pipe P. is there.
[0019]
In addition, when constructing a trench by excavating from the seabed ground surface, the seabed ground surface is often a soft layer such as a silt or mud layer, and the trench is excavated in such ground. Sometimes it is necessary to reduce the angle of the slope of the excavation groove to prevent collapse. Therefore, since the width of the opening of the excavation groove becomes very large compared to the diameter of the pipe embedded in the excavation groove, when constructing the lower support layer by dropping calculus or the like, a large amount of calculus is used. It will be necessary. On the other hand, when the partition members 24 and 24a are arranged at predetermined intervals on the side portion of the pipe P to partition the support layer below the pipe as in this embodiment, the soft ground On the other hand, the support layer can be constructed with an arbitrary width, and the support layer for supporting the pipe to the ground can be easily designed.
[0020]
When creating the partition member, for example, it can be configured using an arbitrary material such as a concrete block or an asphalt block, but when using an asphalt block, a wire or other reinforcing material is used inside the block. It can be created with any length by inserting. Moreover, even if a long asphalt block breaks in the middle, when used as a partition, as long as the asphalt mixture does not leak from the surroundings, the function as a partition member can be satisfactorily exhibited.
[0021]
The partition member can be used only as a mold for placing an asphalt mixture. However, when adapting to the use as a mold, the impact applied from the crushed stone packed between the partition members. As long as it has a strength capable of resisting the pressure when placing the asphalt mixture, it is possible to process a thin iron plate or to use other arbitrary materials. Then, after the calcite is hardened with the asphalt component, the side and upper surfaces are filled with the earth and sand of the upper covering layer 26, so that even if the partition member is corroded over many years, the periphery of the support layer is covered with the upper covering. Since it is filled with the layer, it is not considered that the support layer as the pipe support layer is deformed.
[0022]
In each of the above-described embodiments, after excavating the excavation groove 20, the base support layer 21 is constructed by dropping a crushed stone of an arbitrary size on the bottom portion of the groove, and the support member 27 is arranged at a predetermined interval after being appropriately leveled. And the pipe P can be laid. The support member can be configured using any material, and can be configured to have any height corresponding to a seam portion of a pipe in a submarine conduit or a portion connecting a large diameter pipe and a small diameter pipe. The support member 27 is used to lay the pipe so as not to be uneven. After that, either throw the chopping stone directly from the open-bottomed ship, or lay the chopping stone at a predetermined thickness on the side of the pipe using a bucket or the like, and lay the asphalt mixture on the crushed stone layer Then, the gap between the quarry stones is filled with the asphalt mixture, and one pipe support layer is constructed.
[0023]
As described above, when the asphalt mixture layer mixed with crushed stone or crushed stone is constructed as a pipe support layer, the asphalt mixture flows into the void portion where the crushed stone or crushed stone does not enter the lower surface of the pipe and solidifies. Therefore, the support of the pipe by the support layer is a layer of crushed stone and crushed stone solidified by the asphalt mixture, and can be performed by transmitting force between the crushed stones, and the basic support layer is interposed through the support layer. By transmitting the pressure transmitted to the bottom of the excavation groove to the ground, it is possible to act as a wide pipe support layer. Further, when the support layer constructed on the foundation support layer is configured as a layer of crushed stone and crushed stone solidified by an asphalt mixture, for example, the upper covering layer is a thin layer, and is washed by a sea current or the like. Even when excavated, scouring does not occur in the support layer, so that there is no problem in supporting the pipe.
[0024]
The example shown in FIG. 4 shows a case where a substantially groove-shaped channel member is used instead of arranging sleeper-like support members at a predetermined interval, as shown in FIG. In this example, after excavating the excavation groove 20, the foundation support layer 21 is constructed by dropping crushed stone or the like of an arbitrary size on the bottom portion of the groove. Then, after leveling the surface of the base support layer 21, the groove-like support 27 a is laid on the entire surface, and the pipe P is laid on the groove-like support 27 a, and in the space portion of the lateral portion of the pipe P Place the asphalt mixture. The asphalt mixture to be cast inside the groove-shaped support body has an effect of supporting the pipe so that it does not roll, but if necessary, crushed stones or crushed stones are put into the space, and the asphalt It is also possible to fill the mixture. Therefore, by using the grooved support as described above, the pipe can be easily positioned and supported on the base support layer, and after the pipe is installed, the same as in the case of FIG. An upper covering layer can be constructed to embed the pipe.
[0025]
In each of the above embodiments and the embodiments described later, it is assumed that the upper surface protective material 28 is constructed on the upper surface of the upper covering layer 26. When the upper surface protective material 28 is constructed by an asphalt mat having an arbitrary thickness, even if a protective layer for the upper coating layer is constructed using soft earth and sand obtained from the vicinity of the pipe laying site, the upper coating layer However, it will not be damaged by scouring, and the protective effect on the pipe can be demonstrated well. As shown in the drawing, the upper surface protection member can be arranged in an arbitrary width on the upper portion of the excavated groove, but also covers the entire upper surface of the groove and also on the side of the groove in an arbitrary range. It is also possible to configure the cover so as to have a wide width, and the laying range of the protection member can be selected according to the state of the seabed ground. Moreover, as the upper surface protective material, it is possible to construct a stone layer having an arbitrary width and thickness by dropping crushed stones, crushed stones, etc. from the ship, and to form other arbitrary protective layers Is possible.
[0026]
And, when using the pipe support method shown in the above embodiment, when using a conventional method that uses only a lump such as sand, crushed stone, or crushed stone on the lower surface of the pipe, and stuffs them into the lower part of the structure In comparison, since the main work can be performed from the sea, the submarine work performed by the submersible worker can be reduced, and the construction cost and construction period of the construction can be reduced. In addition, the construction method shown in the embodiment can be applied not only to the submarine pipeline as shown in FIGS. 9 and 10, but also to an arbitrary fluid conveyance pipeline. In each of the above embodiments, since the foundation support layer to be constructed at the bottom of the excavation groove is used as a support means when laying the pipe, when a support member having an arbitrary height can be used, The pipe is supported from the bottom through the support member, and then the support layer and the base support layer are constructed with a common crushed stone layer, and the asphalt mixture is cast and an integrated pipe support layer is constructed. It is also possible.
[0027]
In the above embodiment, the submarine pipeline pipe is laid as a structure. However, in the present invention, for example, when a wide large structure such as a submerged tunnel is constructed in a submarine trench. It is also possible to apply the construction method. The example shown in FIG. 5 shows a case where a road tunnel or the like is submerged and constructed, and a submerged tunnel 40 made of reinforced concrete or the like is installed in the excavation groove 30. In the case of the one-way two-lane submerged tunnel, it is manufactured on the ground as a structure having a width of 20 m, a height of 10 m, and a length of about 50 to 100 m, and is submerged at the installation site and connected on the seabed. Therefore, it is constructed as a road tunnel.
[0028]
When laying the submerged tunnel 40, a wide and deep excavation groove 30 is excavated with a fence or the like, and a rubble is dumped on the bottom surface of the excavation groove to construct a foundation support layer 31 having a predetermined thickness. The submerged tunnel 40 is installed. After the submerged tunnel 40 is installed in the excavation groove, a gap is formed between the bottom surface of the submerged tunnel and the base support layer 31. Therefore, a submerged tunnel such as crushed stone or sand is inserted into the lower gap. A support layer is formed.
[0029]
In order to form the support layer, a lower support layer 32 is constructed by using a method of injecting a lump mixed with water such as sand or gravel, and the asphalt mixture 35 is placed on the sea with respect to the lower support layer 32. The support layer is constructed by infiltrating into the gaps between the blocks and solidifying the blocks with the asphalt mixture 35. As described above, the support layer is constructed by the asphalt mixture and the lump, and the support member for the lower surface of the submerged tunnel 40 is disposed, and then the side and upper surfaces of the submerged tunnel 40 are filled with clay and the like. The filling layer 36 can be constructed, and an upper surface protective material 37 such as an asphalt mat can be laid as necessary to provide a buried tunnel protective work.
[0030]
In the example shown in FIG. 6, after the foundation support layer 31 is formed at the bottom of the excavation groove 30, a massive support material 33 such as a concrete block is arranged in a dotted shape, and the submerged tunnel 40 is positioned on the massive support material. Shows the case. When a submerged tunnel is installed on the base support layer 31 via the massive support member 33, a large gap is formed on the lower surface of the submerged tunnel, so that the asphalt mixture is formed from the side of the submerged tunnel. By injecting the asphalt layer, the asphalt layer integrated with the massive support material by filling the gap can be constructed as the lower support layer.
[0031]
As described above, when installing a wide structure in a drilling groove formed on the seabed, it is difficult to insert a lump such as sand or gravel into the bottom surface of the structure. It is possible to construct a lower support layer without a gap by injecting a flowable asphalt mixture or the like into the lower surface of the substrate. And when constructing a lower support layer such as an asphalt mixture in which the block body and the block support material are integrated, it is easy to form a single plate-like body having an arbitrary thickness on the lower surface of the structure. It is possible to construct a large structure such as a submerged tunnel even on soft ground.
[0032]
The example shown in FIG. 7 shows an example different from the example shown in FIG. 1 or the like in order to support the pipe P. A support base 29 is provided at a predetermined interval at the bottom of the excavation groove 20. An example in which the pipe P is constructed and laid on the support base 29 is shown. In the example shown in FIG. 7, the support base 29 is configured by combining a steel plate with a gate shape, or any other pipe support member can be used, and is supported by a support base constructed on the bottom surface of the groove. In this way, the pipe P is laid.
[0033]
And asphalt mixture is casted and built as a plate-shaped support member so as to fill a predetermined range of the support base 29 and the lower part of the pipe P. The asphalt mixture may be placed to construct a bitumen asphalt layer. Note that. Generally, an asphalt mixture has the property of forming a substantially flat surface with few irregularities due to its fluidity even when applied in the sea, and also has the property of easily flowing into and filling relatively small gaps. is there.
[0034]
The example shown in FIG. 8 shows an example in which the lower support layer is formed of a plate of asphalt mixture and a structure such as the buried tunnel 40 is supported when a large structure is constructed. In this example, for example, a wide and deep groove such as the excavation groove 30 for laying the submerged tunnel 40 is excavated, and then an asphalt mixture layer having an arbitrary thickness is constructed on the bottom surface of the groove. In addition, the lower support layer 34 with less unevenness can be constructed using the flatness of the asphalt. Then, by placing and positioning a large structure on the lower support layer 34, the submerged tunnel 40 and the like can be easily constructed. Therefore, as shown in FIG. 6 and FIG. The buried space can be easily protected by dumping dredged material, stones, or the like in the marginal space next to or above the structure. As shown in FIG. 8, the means for constructing the support layer with the asphalt mixture is naturally applicable to support the pipe.
[0035]
In the embodiment of the present invention, in order to support the structure against the bottom of the excavation groove, an arbitrary material such as a concrete mixture or an asphalt mixture is placed to construct a support layer having an arbitrary thickness. can do. Moreover, also when arrange | positioning a support stand and a support structure in the bottom of a groove | channel, as a material of the said support member, it is possible to use steel structures, concrete, and other arbitrary materials. Further, when the seabed buried object is a rigid body, a relatively rigid support body as shown in each of the above embodiments is constructed. For example, in the case of a relatively flexible pipe line, etc. The structure may be laid according to the unevenness of the support surface in such a manner that the structure is arranged on the thin support layer of the asphalt mixture.
[0036]
If the foundation support layer may or may not need to be constructed on the bottom of the excavation groove, depending on the structure and weight of the structure to be buried and constructed, or the conditions of the seabed ground, etc. It is also possible to construct the structure directly on the bottom surface and to place the asphalt mixture or other material only where it is needed to support the structure. Moreover, as a support layer constructed | assembled on the bottom face of a groove | channel, you may construct | assemble by laying down the existing layered member like an asphalt mat etc. other than the material which has fluidity | liquidity like an asphalt mixture.
[0037]
【The invention's effect】
Since the present invention uses the construction method as described above, the support means for the foundation support layer and the support layer for structures such as pipes and submerged tunnels can be performed by construction from the sea, It is possible to reduce the burden on diving workers. In addition, when constructing a support layer by placing an asphalt mixture in a layer of crushed stone, it is possible to construct an integrated layer with the asphalt mixture entering the gap between crushed stones. It can protect, and it becomes possible to support a structure in a stable state with respect to the seabed ground. Furthermore, when the partition members are arranged at arbitrary intervals to define the width of the support layer, it becomes possible to protect the structure according to conditions such as the support strength of the ground, and laying the submarine pipeline It can be easily adapted to the sea area. And when arranging the upper surface protection material on the excavation groove, the earth and sand that have been backfilled are protected from scouring, and even if the upper covering layer on the structure is thin, the structure from the impact due to the fall of the anchor etc. It is possible to improve the stability of the submarine pipeline.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of an embodiment of the construction method of the present invention.
FIG. 2 is an explanatory diagram of another embodiment of the pipe support method.
FIG. 3 is an explanatory diagram of another embodiment of the pipe support method.
FIG. 4 is an explanatory diagram of another example of FIG. 3;
FIG. 5 is an explanatory diagram of a support method for a square structure.
FIG. 6 is an explanatory diagram of another support method for a square structure.
FIG. 7 is an explanatory view of a support method in which a support structure and an asphalt mixture are combined.
FIG. 8 is an explanatory diagram of a support method using an asphalt mixture.
FIG. 9 is an explanatory diagram of an arrangement state of submarine pipelines.
10 is a side view of the submarine conduit of FIG. 9. FIG.
FIG. 11 is an explanatory diagram of a conventional construction method.
[Explanation of symbols]
1 submarine pipeline, 2 large-diameter pipeline, 3 medium-diameter pipeline, 4 small-diameter pipeline,
5 rise pipes, 6 water outlets, 7 water currents, 8 submarine ground surface,
10 excavation groove, 11 lower support layer, 12 upper covering layer,
13 protective rubble layer, 20 excavation groove, 21 foundation support layer,
22, 23 support layer, 24 partition member,
25/35 asphalt mixture, 26 top coating layer,
27 support member, 28 upper surface protective material, 29 support base,
30 excavation grooves, 31 foundation support layer, 32 lower support layer,
33 Massive support material, 34 Lower support layer,
36 upper packing layer, 37 upper surface protective material,
40 Submerged tunnel.

Claims (3)

It is a construction method to construct a submarine structure by laying a buried structure in a excavation groove constructed by digging down from the seabed ground surface,
A foundation support layer constructed by stacking stones with a predetermined thickness on the bottom of the excavation groove, and a support member for supporting the buried structure on the foundation support layer,
In a state where an embedded structure is laid on the support member, the asphalt mixture is infiltrated and integrated between the stones of the foundation support layer,
Furthermore, after covering the foundation support layer and the buried structure, the upper covering layer is constructed according to the seabed ground surface, and then an upper surface protection member is laid corresponding to the seabed ground surface. Construction method for undersea structures. When constructing the foundation support layer, disposing partition members on the both sides of the embedded structure via an arbitrary interval, constructing a stone layer between the partition members,
The construction method of a submarine buried structure according to claim 1, wherein an asphalt mixture is constructed on the stone layer. Constructing a base support layer and a support member at predetermined intervals in the length direction of the bottom of the excavation groove,
Laying an embedded structure supported by the support member,
After the step of constructing the foundation support layer by constructing the asphalt mixture to a predetermined thickness on the bottom and side of the laid buried structure,
2. The construction method for a submarine embedded structure according to claim 1, wherein the foundation support layer and the embedded structure are covered and an upper covering layer is constructed in accordance with the seabed ground surface.

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