JP4537228B2 - Shallow buried method using fluidized soil - Google Patents

Description

The present invention relates to a shallow burial method using fluidized soil .

  In the conventional underground burying method using a filler such as fluidized soil and treated soil, a buoyancy prevention material is installed to prevent buoyancy (buoyancy) due to the groundwater level after the construction of the buried pipe. However, in this conventional construction method, the buoyancy after construction was suppressed by a soil cover filled (placed) in the upper part, so the position (installed) of the buried pipe was a serious demerit. In view of the above, the present invention solves the disadvantages of this conventional construction method and provides a construction method capable of easily installing a buried pipe in a shallow layer. That is, a plate material is fixed to the lower part of a pair of retaining walls placed in the soil, a buried pipe is installed on the plate material, and a buoyancy prevention material is fixed on the plate material. Responds to the weight and fixes the buried pipe with this buoyancy prevention material, and can counter the buoyancy applied to the buried pipe with this buoyancy prevention material and / or plate / pair retaining wall and earth pressure on this retaining wall Is intended.

  Prior art documents related to the present invention include the following documents (1) to (3). The outline will be described below.

  Document (1) is “A method for preventing pipe levitation and setting a pipe slope” disclosed in JP-A-6-249365. Recently, instead of heavy buried pipes (embedded pipe materials), that is, ductile pipes, lightweight FRP pipes and FRPM pipes with small specific gravity have been used. This kind of FRP pipes and FRPM pipes have been used. Although it has the advantage of light weight, its own weight is smaller than the volume per unit length, so that there is a problem that it floats due to buoyancy in the fluidized soil during pipe backfilling. In order to solve this problem, the invention of the document (1) includes a step of fixing a pipe fixture by setting a pipe gradient in advance on a sheet pile placed in the pipe after excavating the pipe. And a step of laying a pipe on the pipe line fixing tool, a step of fixing a stagnation pipe levitation prevention tool to the pipe line fixing tool from above the laid pipe, a step of swallowing and fixing the pipe, and a flow The process comprises the step of introducing the liquefied soil into the pipe and burying the pipe, and the pipe is fixed to the pipe with an accurate pipe gradient by a pipe fixture that is set and fixed in advance. Laid. In addition, there is a feature that the pipe floating is prevented by the pipe floating prevention tool fixed to the pipe line fixing tool.

  Document (2) is a “pipe embedding method” disclosed in Japanese Patent Laid-Open No. 7-317959. The contents are a burying method using fluidized soil in which fluidized soil is introduced around a pipe laid on a pipe base floor to embed the pipe. However, this construction method requires a large amount of fluidized soil, and requires a large plant for producing a large amount of fluidized soil, resulting in high costs. In order to solve this problem, in the invention of the reference (2), after laying a pipe on a previously placed pipe base floor, a lump such as crushed stone is introduced around the pipe, After creating a continuous gap between them, the fluidized soil is introduced into the continuous gap between the blocks, and the pipe floats even if the fluidized soil is introduced from the injection pipe. However, the fluidized soil is smoothly introduced from the injection pipe, and the amount of the fluidized soil used is reduced.

  Document (3) is a “pipe embedding method” disclosed in Japanese Patent Application Laid-Open No. 2004-125100. The contents of the conventional method of embedding with fluidized soil are excavated with a margin of about 30 cm at least to the left and right of the diameter of the pipe in which the excavation groove is embedded, so the amount of soil to be excavated (disposal of residual soil) If the amount of backfill material is large, and there is a margin of about 30 cm between the pipe and the wall of the excavation groove, the fluidized soil placed in the periphery of the pipe It took 2 to 4 hours to solidify, and it was necessary to wait until the earth and sand were compacted, resulting in problems such as a long construction time. In order to solve this problem, the invention of the document (3) is a pipe burying method in which a pipe is buried under the ground surface by an open-cut method, and a maximum of 10 cm to the left and right with respect to the diameter of the pipe burying the excavation groove After excavating with a minimum width with sufficient margin, a pipe is arranged in the excavation groove, and fluidized soil is filled to a position not exceeding 1/2 of the diameter of the tube. It is configured to immediately backfill and roll the earth and sand at the upper part, and it can reduce the amount of earth and sand to be excavated when pipes are buried in the ground by the open-cut method, and can significantly reduce the construction time, or the land after backfilling There are features such as the ability to reliably prevent surface settlement.

JP-A-6-249365 JP 7-317959 A JP 2004-125100 A

  In literature (1), a pipe slope is set on a sheet pile to fix a pipe fixing tool, the pipe is fixed with this pipe fixing tool and / or a stagnation pipe anti-floating tool, and the fluidized soil is used as the pipe. This is a configuration in which the charging pipe is buried. Therefore, it is suitable for a small-diameter pipe, but is inconvenient for a large-diameter pipe. In addition, it is a conventional method of placing the pipe base floor as an alternative to the plate material, which leads to complicated on-site work, and problems such as the provision of the base material and the time required for the placing work are considered. . Depending on the ground, it may be difficult to construct.

  Reference (2) is a configuration in which a pipe is laid on a pipe base floor, lump such as crushed stone is thrown in, and fluidized soil is thrown into a gap formed continuously between the lump. . Therefore, it is necessary to perform a lump work such as crushed stone, which leads to a complicated on-site work, and there are problems such as providing a lump object and requiring labor for the lapping work. Depending on the ground, it may be difficult to construct. Furthermore, it is considered that it is not suitable for the industry flow intended to expand fluidized soil (waste treatment).

  Furthermore, the document (3) is excavated with a minimum width of 10 cm at the left and right with respect to the diameter of the pipe in which the excavation groove is embedded by the open-cut method, and a pipe is disposed in the excavation groove. After the fluidized soil is filled to a position that does not exceed 1/2 of the diameter, the soil is backfilled and rolled. Therefore, it is suitable for a small diameter pipe such as a gas pipe, but it is considered inconvenient for a large diameter pipe. In addition, this construction method has a structure in which sandbags are piled up at both ends of the cloth moat drilled by the open-cut method, so it is suitable for embedding small-diameter pipes in shallow soil (underground). There is a problem in burying inside. In addition, it is not a structure that suppresses the buoyancy generated by the groundwater level and / or fluidized soil filling (groundwater level, etc.) by using the antifloating material on the plate and pipe base floor, so that the small-diameter pipe is shallow as described above. It is thought that it is limited to construction that is buried in the soil.

  The invention of claim 1 proposes a method for backfilling a shallow buried pipe using fluidized soil, so that the buried pipe and surrounding raw material soil (construction generated soil) are solidified by a buoyancy prevention material fixed to the plate. It is intended to be integrated with fluidized soil mixed with wood and water, and / or soil in the ground, and to prevent lifting due to buoyancy generated at the groundwater level with respect to the buried pipe.

  The invention of claim 1 is intended to achieve the following. (1) Effective use of construction waste soil. (2) To reduce excavation and / or backfill sections. (3) The length of the earth retaining wall (earth retaining material such as a sheet pile) is shortened. (4) After the completion of construction, buoyancy prevention materials to prevent buoyancy due to groundwater level etc. will be installed on the plate material. (5) Instead of the conventional method with a deep pipe installation position, a buried pipe is simply installed in the shallow layer. (6) The buoyancy prevention material is fixed to the plate material installed at the lower part of the buried pipe, and the weight of the soil is received by the whole plate material to suppress the buoyancy applied to the buoyancy prevention material.

In this claim 1, it is a shallow layer embedding method using fluidized soil in the following steps,
In the first step, the ground to be buried is excavated and walls are constructed, and a construction space having a width of about 200 to 400 mm is secured at least on both sides of the buried pipe.
A 2nd process installs the gabion which can become a foundation of an underground pipe installation under the said wall.
In the third step, half of the upper part of the buried pipe is fitted, and the lower ends of the pair of buoyancy prevention materials for suppressing the buoyancy generated at the groundwater level applied to the buried pipe are fixed to the gabion . .
In the fourth step, a buried pipe support member that can serve as a foundation for the buried pipe installation is installed on the gabion .
In the fifth step, a buried pipe is installed in the gabion and / or buried pipe support member, and a filling space for filling the fluidized soil filler is formed between the buried pipe and the construction space.
The sixth step is a pair of buoyancy prevention materials equipped with approximately half of the upper part of the buried pipe, and suppresses the buoyancy generated at the groundwater level, etc. applied to the buried pipe, and prevents this pair of buoyancy. Using material, buoyancy is transmitted to gabion .
In the seventh step, the filling material is filled into the filling space at once, and the on-site generated soil is backfilled.

The invention of claim 2 has the same intention as that of claim 1, but intends to simplify construction, reduce costs, shorten the construction period, and the like, and omits the installation of the buried pipe support member.

In this claim 2, it is a shallow layer burying construction method by fluidized soil in the following steps,
In the first step, the ground to be buried is excavated and walls are constructed, and a construction space having a width of about 200 to 400 mm is secured at least on both sides of the buried pipe.
A 2nd process installs the gabion which can become a foundation of an underground pipe installation under the said wall.
In the third step, half of the upper part of the buried pipe is fitted, and the lower ends of the pair of buoyancy prevention materials for suppressing the buoyancy generated at the groundwater level applied to the buried pipe are fixed to the gabion . .
In the fourth step, a buried pipe is installed in the gabion , and a filling space for filling the fluidized soil filler is formed between the buried pipe and the construction space.
The fifth step is the pair of buoyancy prevention materials equipped with substantially the upper half of the buried pipe, and suppresses the buoyancy generated at the groundwater level applied to the buried pipe and prevents the buoyancy of the pair. Using material, buoyancy is transmitted to gabion .
In the sixth step, the filling material is filled into the filling space at once, and the on-site generated soil is backfilled.

The invention of claim 3 is a shallow method in which a pair of retaining walls is installed in order to achieve the object of claim 1 or claim 2 and to reduce the influence on the ground around the excavation optimum for achieving the object. It is intended to provide a layer embedding method.

In claim 3, when excavating the ground to be buried according to claim 1 or claim 2, the flow is performed after installing a pair of retaining walls in order to reduce the influence on the ground around the excavation. It is a shallow burial method using chlorinated soil .

The invention of claim 4 is intended to achieve the object of claim 1 or claim 2 and to provide means for connecting (coupling) pairs of buoyancy prevention materials optimal for achieving the object.

In this fourth aspect, fluidization in which the upper ends of the pair of buoyancy preventive members according to the first or second aspect are connected by physical means such as a turnbuckle, welding, hook-and-loop fastener, or adhesion . It is a shallow burial method using treated soil .

The invention of claim 5 is intended to achieve the object of claim 1 or claim 2 and to provide an optimum pair of retaining walls for achieving this object.

In this claim 5, the retentive wall according to claim 1 or claim 2 is secured with a repose angle in order to avoid the influence on structures such as buildings, public structures such as roads and railways. This is a shallow burial method using fluidized soil .

The invention of claim 6 is intended to achieve the object of claim 1 or claim 2 and to provide an optimum buried pipe structure for achieving the object.

The sixth aspect of the present invention is a shallow-layer embedding method using fluidized soil in which a heavy object is built in the buried pipe according to claim 1 or claim 2 .

The invention of claim 7 is intended to achieve the object of claim 1 or claim 2 and to provide an optimal plate structure for achieving the object.

The seventh aspect is a shallow burial method using fluidized soil in which the gabions according to the first or second aspect are installed without a gap between the walls.

The invention of claim 1 is a shallow layer embedding method using fluidized soil in the following process,
In the first step, the ground to be buried is excavated and walls are constructed, and a construction space having a width of about 200 to 400 mm is secured at least on both sides of the buried pipe.
A 2nd process installs the gabion which can become a foundation of an underground pipe installation under the said wall.
In the third step, half of the upper part of the buried pipe is fitted, and the lower ends of the pair of buoyancy prevention materials for suppressing the buoyancy generated at the groundwater level applied to the buried pipe are fixed to the gabion . .
In the fourth step, a buried pipe support member that can serve as a foundation for the buried pipe installation is installed on the gabion .
In the fifth step, a buried pipe is installed in the gabion and / or buried pipe support member, and a filling space for filling the fluidized soil filler is formed between the buried pipe and the construction space.
The sixth step is a pair of buoyancy prevention materials equipped with approximately half of the upper part of the buried pipe, and suppresses the buoyancy generated at the groundwater level, etc. applied to the buried pipe, and prevents this pair of buoyancy. Using material, buoyancy is transmitted to gabion .
In the seventh step, the filling material is filled into the filling space at once, and the on-site generated soil is backfilled.

  Therefore, claim 1 proposes a method for backfilling a shallow buried pipe using fluidized soil, and solidifies the buried pipe and surrounding raw soil (construction generated soil) with a buoyancy prevention material fixed to the plate. It can be integrated with fluidized soil mixed with wood and water and / or soil in the ground, and can be prevented from lifting due to buoyancy generated at the groundwater level with respect to the buried pipe.

  Further, the invention of claim 1 is characterized in that the following contents can be achieved. (1) Effective use of construction waste soil. (2) Excavation and / or backfilling cross section can be reduced. (3) The length of the earth retaining wall (earth retaining material such as a sheet pile) can be shortened. (4) After the completion of construction, a buoyancy prevention material for preventing buoyancy due to groundwater level or the like can be installed on the plate material. (5) Instead of the conventional method with a deep pipe installation position, a buried pipe can be installed in a shallow layer easily. (6) The buoyancy prevention material is fixed to the plate material installed in the lower part of the buried pipe, and the weight of the soil is received by the whole plate material, and the buoyancy applied to the buoyancy prevention material can be suppressed.

The invention of claim 2 is a shallow layer embedding method using fluidized soil in the following process,
In the first step, the ground to be buried is excavated and walls are constructed, and a construction space having a width of about 200 to 400 mm is secured at least on both sides of the buried pipe.
A 2nd process installs the gabion which can become a foundation of an underground pipe installation under the said wall.
In the third step, half of the upper part of the buried pipe is fitted, and the lower ends of the pair of buoyancy prevention materials for suppressing the buoyancy generated at the groundwater level applied to the buried pipe are fixed to the gabion . .
In the fourth step, a buried pipe is installed in the gabion , and a filling space for filling the fluidized soil filler is formed between the buried pipe and the construction space.
The fifth step is the pair of buoyancy prevention materials equipped with substantially the upper half of the buried pipe, and suppresses the buoyancy generated at the groundwater level applied to the buried pipe and prevents the buoyancy of the pair. Using material, buoyancy is transmitted to gabion .
In the sixth step, the filling material is filled into the filling space at once, and the on-site generated soil is backfilled.

Therefore, claim 2 can achieve the same intention as claim 1, can further simplify the construction, reduce costs, shorten the construction period, etc., and can omit the installation of the buried pipe support member. There are features.

The invention of claim 3 is a structure that is performed after excavating the ground to be buried according to claim 1 or claim 2 after installing a pair of retaining walls with the intention of reducing the influence on the ground around the excavation. This is a shallow burial method using fluidized soil .

Therefore, Claim 3 can achieve the object of Claim 1 or Claim 2, and is a shallow layer in which a pair of retaining walls is installed in order to reduce the influence on the ground around the excavation optimum to achieve this object. There is a feature such as being able to provide a buried construction method.

According to a fourth aspect of the present invention, there is provided a flow in which the upper ends of the pair of buoyancy prevention materials according to the first or second aspect are connected by physical means such as a turnbuckle, welding, a hook-and-loop fastener, or an adhesive. It is a shallow burial method using chlorinated soil .

Therefore, the fourth aspect is characterized in that the object of the first or second aspect can be achieved, and that a pair of buoyancy preventing material coupling (coupling) means optimal for achieving the object can be provided.

The fifth aspect of the invention secures the angle of repose of the earth retaining wall according to the first or second aspect of the invention in order to avoid the influence on a structure such as a building or a public structure such as a road or a railway. This is a shallow burial method using fluidized soil .

Therefore, claim 5 has the characteristics that the object of claim 1 or claim 2 can be achieved, and that an optimal pair of retaining walls can be provided to achieve this object.

The invention of claim 6 is a shallow-layer embedding method using fluidized soil in which a heavy object is built in the embedding pipe according to claim 1 or claim 2 .

Therefore, claim 6 has the characteristics that the object of claim 1 or claim 2 can be achieved, and an optimum buried pipe can be provided to achieve this object.

The invention of claim 7 is a shallow burial method using fluidized soil in which the gabion according to claim 1 or 2 is installed without a gap between the walls.

Accordingly, the seventh aspect is characterized in that the object of the first or second aspect can be achieved, and that an optimal plate material structure can be provided to achieve the object.

  Hereinafter, a preferred embodiment of the present invention will be described.

  ◎ First, the embedding method for placing earth retaining walls is described as “1” to “8”.

  “1” A process for installing a retaining wall and performing excavation and / or flooring will be described.

  The purpose of this step is to install (press-fit, place, etc.) earth retaining walls 1, 1 (single numbers when paired) in order to reduce the influence on the surrounding ground. The earth retaining wall 1 uses a material suitable for the ground. For example, a steel sheet pile, H steel + sheet pile, continuous underground wall, etc. Civil engineering machines for constructing the retaining wall 1 include cranes, press-fitting machines, vibrators, continuous wall construction machines, trenchers, power blends, TRD (trade name: trademark), SMW (trade name: trademark), etc. Is desirable.

  After the earth retaining wall 1 is installed, the construction space 2 is secured by excavation. If the groundwater level is high, a temporary cutoff (water blocking wall) will be constructed. In the case of this excavation, if it is a conventional construction method, construction space is provided about 500 mm on both sides of the buried pipe 3, but since this construction method is not required, the amount of excavated soil in the lateral direction is reduced accordingly. The earth retaining wall 1 is installed with a repose angle A secured in order to avoid the influence on structures such as buildings and public structures H such as roads and railways.

  “2” A process of installing a temporary material (if necessary) and / or a plate material will be described.

  The purpose of this process is to prevent collapse of the earth retaining wall 1 and when there is a risk of collapse, or when considering the safety management, rules, etc., and when temporary materials are needed sequentially and / or depending on the situation To do. In this example, the upset 400 and / or the cut beam 4 and the lining plate 401 are installed to prevent the collapse and to ensure safety. Of course, this temporary material is designed in consideration of the surrounding ground, excavation depth, etc., but may not be necessary. In any case, the length of the cut beam 4 can be shortened by the reduction of the excavation width compared to the conventional method, and it is effective, the installation can be simplified, the cost can be reduced, and the like.

  Thereafter, a plate 5 such as a concrete plate, a steel plate, or a composite plate is provided on the bottom surface 200 of the construction space 2. A pair of buoyancy prevention materials 6 are fixed (fixed) to the plate material 5. This plate material 5 is composed of fluidized treated soil, treated soil and other filler 7 and / or backfilled soil 8 (generated on site) placed in a space (filling space 201) formed by the construction space 2 and the buried pipe 3. The structure can withstand the weight of earth and sand. Further, the plate member 5 has a role as a support body for the pair of buoyancy prevention members 6 that suppress buoyancy generated at the groundwater level or the like applied to the buried pipe 3, and has a structure that can withstand the buoyancy of the buried pipe 3. Further, the plate material 5 serves as a basis for installation (installation) of the buried pipe 3. Moreover, since this board | plate material 5 is set as the structure which can ensure the area ratio required in the length direction of the buried pipe 3, for example, as a support under the retaining wall 1 (excavation wall 1a) and / or earth pressure countermeasure means It is intended to provide the above functions, to avoid the floating of the plate material 5 itself, to avoid destruction by earth pressure, and the like.

  In addition, it is useful for reinforcement of this earth retaining wall 1 (excavation wall 1a) by installing the board | plate material 5 between the earth retaining walls 1 (excavation wall 1a), for example, the earth retaining wall 1 (excavation wall 1a). ) To prevent falls and collapse, and to simplify the reinforcement work.

  Although this cut beam 4 changes according to the site, concrete, a concrete secondary product, steel products, etc. are used. For the construction of the beam 4, a crane, a machine necessary for placing concrete, or the like is used although it varies depending on the site.

  “3” A process for installing a buoyancy prevention material and / or a buried pipe (FRPM pipe, steel pipe, fume pipe) will be described.

  The purpose of this step is to transmit the buoyancy applied to the buried pipe 3 to the lower plate 5 after the construction is completed by tightening the buried pipe 3 to the plate 5 via the pair of buoyancy prevention materials 6. The buoyancy is buoyancy generated in the buried pipe 3 due to the groundwater level after the construction of the buried pipe 3 on the plate material 5 is completed. It also serves as a measure for buoyancy during construction. As other construction methods, for example, a construction method in which the material is pressed from above at the time of construction, or a buoyancy measure such as inserting a heavy object (not shown) inside the pipe may be taken. And, the construction sequence for fixing the buoyancy prevention material 6 to the plate material 5 is performed after the plate material 5 is fixed to the retaining wall 1, or after being fixed to the plate material 5 in advance, or to the retaining wall 1. It is free to fix the buried pipe 3 after it is installed on the plate 5 or the like. However, a desirable method is to fix the buoyancy prevention material 6 after fixing the plate material 5, install the buried pipe 3 between the buoyancy prevention materials 6, and then connect (join) the upper end of the buoyancy prevention material 6. In this construction sequence, the buried pipe 3 is fastened. This construction order is easy to install the buried pipe 3 between the buoyancy prevention materials 6 provided on the plate material 5 and / or easy to connect the buried pipe 3 installed in a narrow space such as the construction space 2, This is beneficial in terms of certainty.

  The buoyancy prevention material 6 may be a steel band and / or a band processed with a synthetic resin or the like, a reinforcing bar, a round steel bar, or the like. The buoyancy prevention material 6 is usefully tightened (bonded) by physical means such as turnbuckles, welding, hook-and-loop fasteners, and adhesion, which can be easily and quickly handled. And the handling of the buried pipe 3 is performed by employing a manual work, an unloading machine or the like.

  “4” A process of installing a buried pipe that employs a buried pipe support member will be described.

  The purpose of this step is to show another example in which the buried pipe support member 10 is installed by the buried pipe support member 10. In this example, the upper surface of the buried pipe support member 10 is made a curved surface so that the familiarity with the buried pipe 3 can be secured. Plan for installation. Further, it is used as a correction of the position of the buried pipe 3 and is used for burying the buried pipe 3 at the design position, eliminating distortion of the plate material 5, and solving other problems of the plate material 5. This buried pipe support member 10 is a process to be provided if necessary.

  The buried pipe support member 10 is made of a material such as concrete, a concrete secondary product, steel, wood, or a filler. Moreover, it is also possible to give a buffering effect to the buried pipe support member 10 to achieve construction safety and simplification (the same applies to other examples). Further, the buried pipe support member 10 is ideally configured to be detachable from the buried pipe 3 so that it can be freely used, adjusted in height, adjusted in the buried position, and / or changed in the ground.

  Although the plate material 5 has been described as having a plate shape, a gabion method (not shown) is also possible. This gabion is, for example, a plate shape that is installed between the earth retaining wall 1 (excavation wall 1a) without a substantial gap. And an example of a shape having a predetermined length in a predetermined longitudinal direction (a direction orthogonal to the interval direction), and b) a double bar shape divided between the earth retaining wall 1 (excavation wall 1a). In addition, an example of a shape having a predetermined length in a predetermined longitudinal direction (a direction orthogonal to the interval direction) is conceivable, but is not limited. And this gabion method is a construction method suitable for ground (underground), soft ground, deformed ground, etc. where groundwater is likely to be generated.

  “5” The step of connecting the buoyancy prevention material will be described.

  The purpose of this step is to install the buoyancy prevention material 6 installed in advance at the stage where the embedded tube 3 is installed at a predetermined position after the installation of the embedded tube 3 on the plate material 5 and / or the embedded tube support member 10 is completed. Connect above 3. As described above, the buoyancy prevention material 6 may be installed after the buried pipe 3 is installed, and the above-described operation may be performed in some cases.

  “6” Explain the backfilling process using fluidized soil.

  The purpose of this process is the advantage that the filling material 7 (referred to as fluidized soil 7) such as fluidized soil and treated soil is rich in fluidity and therefore does not require operations such as compaction and / or rolling. Thus, for example, it is beneficial to save labor on the work site, improve versatility, or avoid obstacles to traffic and walking. Furthermore, there are advantages in improving the construction speed, shortening the construction period, and reducing the cost in burial work.

  In addition, as another example of the fluidized soil 7, a material having an effect equivalent to this, or a material configured by combining the fluidized soil 7 with sand, mountain sand, on-site generated soil, fly ash, or the like ( It is also possible in the case of kneaded materials. By using various types of wastes (waste materials), it is possible to effectively use industrial waste materials, eliminate harmful effects caused by the disposal, protect the environment, and effectively use resources. The fluidized soil 7 is not limited to single use. For example, the lower half of the buried pipe 3 uses the fluidized soil 7 and the other backfill soil 8 (site-generated soil). In this example, it is intended to facilitate handling (processing) of earth and sand generated on site and to solve problems caused by earth and sand transport. In addition, in order to respond | correspond to each buoyancy at the time of construction, injection | throwing-in of the fluidization processing soil 7 may be divided into 2 to several times.

  “7” The temporary material removal and / or upper backfilling step will be described.

  The purpose of this step is to remove and restore the temporary materials (the erection 400 and / or the beam 4 and the lining plate 401, etc.) provided as necessary in the same manner as before. And when the surrounding ground is considered, the earth retaining wall 1 and / or the temporary material may be left behind. The surface near the surface after removal of the temporary material will be restored with fluidized soil 7, sand, mountain sand, local soil, etc.

  An example of the application of the present invention is as follows: Replacement by new pipe construction / repair, etc. Replacement by existing underground pipes (open waterways, etc.) / Repair: Lifelines such as waterways, gas pipes, and electricity It may be exchanged by undergrounding or repairing.

  “8” A backfilling process using fluidized soil that does not employ a buried pipe support member will be described.

  In this example, the buried pipe 3 is installed directly on the plate material 5. Of course, if necessary, it is possible to provide rotation prevention means and / or cushioning material, etc., to make the construction safe and easy (other examples are the same).

  Each construction procedure mentioned above is a preferable example, and it changes with conditions, such as the ground, a buried environment, and traffic volume. And even if this construction procedure is different, it is an embodiment as long as it is within the concept of the present invention.

  ◎ Next, the open cut method will be explained.

  “9” is an open cut method, and examples of this are shown in FIGS. In this method, the construction space 2 is secured by excavating the excavation wall 1a at an angle (rest angle A) that does not collapse by the open cut. The plate material 5 is provided on the bottom surface 200 of the construction space 2 in the same manner as in the above example. A pair of buoyancy prevention materials 6 are fixed (fixed) to the plate material 5. This plate material 5 can withstand the weight of fluidized soil 7 and / or backfill soil 8 (site-generated soil sand) placed in the space (filling space 201) formed by the construction space 2 and the buried pipe 3. It is a structure. In this example, it is possible to temporarily stop (stop) the fluidized soil 7 as a countermeasure for buoyancy at the time of construction, and an example thereof is indicated by an arrow a. Specifically, the illustrated angle and stop position are ideal. Thereafter, the next fluidized soil 7 and / or backfill soil 8 is placed. FIG. 11 is a schematic diagram in which each member provided with fluidized soil 7 or the like or provided when necessary is removed. And each other process, a procedure, etc. are based on the above-mentioned example.

Schematic diagram explaining the steps of earth retaining wall installation and excavation and / or flooring Schematic diagram explaining the steps of temporary material installation (if necessary) and / or plate material installation Schematic explaining the process of installing buoyancy prevention material Schematic diagram illustrating the process of installing buried pipe support members and / or installing buried pipes (FRPM pipes, steel pipes, fume pipes), etc. Schematic explaining the process of connecting buoyancy prevention materials Schematic diagram explaining the backfilling process using fluidized soil Schematic diagram explaining temporary material removal and / or upper backfilling process Schematic diagram explaining the process of installing buried pipes that do not employ buried pipe support member installation Schematic diagram explaining the process of excavation and / or installation of plate materials and buoyancy prevention materials by the open cut method FIG. 9 is a schematic diagram for explaining the stopping process of the fluidized soil 7 in the example of FIG. FIG. 9 is a schematic diagram for explaining the process of installing the buried pipe of the example

DESCRIPTION OF SYMBOLS 1 Earth retaining wall 1a Excavation wall 2 Construction space 200 Bottom surface 201 Filling space 3 Buried pipe 4 Cut beam 400 Raising 401 Backing board 5 Plate material 6 Buoyancy prevention material 7 Fluidization processing soil 8 Earth and sand 10 Buried pipe support member A Rest angle H Public structure b Arrow

Claims (7)

It is a shallow burial method using fluidized soil in the next process,
In the first step, the ground to be buried is excavated and walls are constructed, and a construction space having a width of about 200 to 400 mm is secured at least on both sides of the buried pipe.
A 2nd process installs the gabion which can become a foundation of an underground pipe installation under the said wall.
In the third step, half of the upper part of the buried pipe is fitted, and the lower ends of the pair of buoyancy prevention materials for suppressing the buoyancy generated at the groundwater level applied to the buried pipe are fixed to the gabion . .
In the fourth step, a buried pipe support member that can serve as a foundation for the buried pipe installation is installed on the gabion .
In the fifth step, a buried pipe is installed in the gabion and / or buried pipe support member, and a filling space for filling the fluidized soil filler is formed between the buried pipe and the construction space.
The sixth step is a pair of buoyancy prevention materials equipped with approximately half of the upper part of the buried pipe, and suppresses the buoyancy generated at the groundwater level, etc. applied to the buried pipe, and prevents this pair of buoyancy. Using material, buoyancy is transmitted to gabion .
In the seventh step, the filling material is filled into the filling space at once, and the on-site generated soil is backfilled. It is a shallow burial method using fluidized soil in the next process,
In the first step, the ground to be buried is excavated and walls are constructed, and a construction space having a width of about 200 to 400 mm is secured at least on both sides of the buried pipe.
A 2nd process installs the gabion which can become a foundation of an underground pipe installation under the said wall.
In the third step, half of the upper part of the buried pipe is fitted, and the lower ends of the pair of buoyancy prevention materials for suppressing the buoyancy generated at the groundwater level applied to the buried pipe are fixed to the gabion . .
In the fourth step, a buried pipe is installed in the gabion , and a filling space for filling the fluidized soil filler is formed between the buried pipe and the construction space.
The fifth step is the pair of buoyancy prevention materials equipped with substantially the upper half of the buried pipe, and suppresses the buoyancy generated at the groundwater level applied to the buried pipe and prevents the buoyancy of the pair. Using material, buoyancy is transmitted to gabion .
In the sixth step, the filling material is filled into the filling space at once, and the on-site generated soil is backfilled. When excavating the ground to be buried according to claim 1 or claim 2, shallowing by the fluidized soil, which is performed after installing a pair of retaining walls in order to reduce the influence on the surrounding ground for excavation Layer burying method. A shallow layer embedment by fluidized soil in which the upper ends of the pair of buoyancy prevention materials according to claim 1 or 2 are connected by physical means such as turnbuckle, welding, hook-and-loop fastener, adhesion, etc. Construction method. The Retaining wall according to claim 1 or claim 2, the structure of the building such as roads, in order to avoid affecting the public structures railways and configured to be installed to secure the repose angle flow Shallow burial method using chlorinated soil . A shallow burial method using fluidized soil in which a heavy object is built in the burial pipe according to claim 1 or claim 2 . A shallow burial method using fluidized soil in which the gabion according to claim 1 or 2 is installed without a gap between walls.

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