JP3172449B2 - Civil engineering method using permeable net - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a civil engineering method using a water-permeable net, and more particularly to a civil engineering method for laying sheets and nets for improving soft ground, embankment, and retaining wall construction. Civil engineering method using a water-permeable net that has excellent water permeability after construction, can quickly penetrate rainwater etc. into the ground, has sufficient strength, and does not break the net due to the load applied from above after construction Is to provide.

[0002]

2. Description of the Related Art Conventionally, in the civil engineering method of laying a sheet or net for improvement of soft ground, embankment, retaining wall construction, etc., a net is sandwiched between nonwoven fabrics made of synthetic fibers such as polyester and vinylon. It used a sheet material with a rigid structure. In this sheet material structure, if a non-woven fabric having a low tensile strength is used as the sheet material as it is, the sheet material may be damaged due to the weight of the embankment on the sheet, a traffic load applied after construction, etc. The net was arranged for the purpose of reinforcement.

[0003]

However, the prior art as described above has the following problems.
In other words, since the net is sandwiched between non-woven fabrics, if a load is applied from above, if the net is large, the non-woven fabric will protrude from the mesh and break the non-woven fabric, which is weak in strength, and conversely, If the mesh of the net is small, the material of the net itself does not have water permeability, so that there is a problem that water is stagnated in the net portion and water permeability is deteriorated. There is also a problem that the soil is easily slipped by the soil and the non-woven fabric. The present invention has been made in view of the above-described conventional problems, and has an improved water permeability after construction in a civil engineering method performed by laying a sheet or a net for construction of a soft ground, embankment, retaining wall construction, or the like. In addition, an object of the present invention is to provide a civil engineering method using a water-permeable net that has sufficient strength and does not break the net due to a load applied after construction.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and in the civil engineering method using a water permeable net according to the first aspect, a water permeable net is laid on soft ground. , a civil engineering construction method for improving the soft ground by covering the sediment from the top of the water-permeable net, the water permeability net, net equipped with a water-permeable fibers to a net made of impermeable fibers, the permeable fiber Impermeable fiber core inside
A net made of fibers put as a material, a net made of fibers in which a water-permeable fiber and a water-impermeable fiber of a required length are twisted, and a required fiber obtained by blending a water-permeable fiber and a water-impermeable fiber Or a net made of fiber having a length.

In the civil engineering method using a water-permeable net according to the second aspect, a water-permeable net is laid on the ground, embankment is performed on the water-permeable net, and the water-permeable net laid on the embankment is folded back. Involvement, further laying a water permeable net on this, by repeating the process of performing the embankment after processing in the same manner as described above, is a civil engineering method of embankment of a predetermined height, wherein the water permeable net is Made of impervious fibers
Net with water-permeable fiber attached to the net, water-permeable fiber
Fiber with impervious fiber inside as core material
A net made of fibers obtained by twisting a water-permeable fiber and a water-impermeable fiber of a required length, a net made of fibers of a required length obtained by blending a water-permeable fiber and a water-impermeable fiber, It was decided to consist of either.

In the civil engineering method using a water-permeable net according to the third aspect, a water-permeable net is laid on the ground, embankment is performed on the water-permeable net, and a water-permeable net is further laid on the embankment. by repeating the step of performing, a civil construction method for performing embankment of a predetermined height, the water permeability net, not
Nets with water-permeable fibers attached to nets made of water-permeable fibers, with water-impermeable fibers as the core material in the water-permeable fibers
A net made of fibers, a net consisting of fibers obtained by twisting a water-permeable fiber and a water-impermeable fiber of a required length, a fiber of a required length obtained by blending a water-permeable fiber and a water-impermeable fiber Or a net consisting of

According to a fourth aspect of the present invention, a permeable net is laid on the ground, embankment is performed on the permeable net, and the laid net is folded on the embankment. After further laying a water-permeable net on this, repeating the process of performing the same as above and then performing the embankment, and then performing the embankment of a predetermined height, and then installing a retaining wall on the wall surface of the embankment. In the civil engineering method, the water-permeable net is a net in which a water-permeable fiber is attached to a net made of a water-impermeable fiber;
A net formed from fibers inserted as a core material, a net made of fibers obtained by twisting a water-permeable fiber and a water-impermeable fiber of a required length, obtained by blending a water-permeable fiber and a water-impermeable fiber And a net made of fibers of a required length.

[0008] In the civil engineering method using a water-permeable net according to claim 5, a water-permeable net is laid on the ground, an embankment is laid on the water-permeable net, and a water-permeable net is further laid on the embankment. After performing embankment of a predetermined height by repeating the steps to be performed, in the civil engineering method of providing a retaining wall on the embankment wall surface, the water-permeable net is made of impermeable fibers
Net with water-permeable fiber attached to the net, inside water-permeable fiber
Into a net with impermeable fibers as the core material
A net made of fibers obtained by twisting a water-permeable fiber and a water-impermeable fiber of a required length, a net made of fibers of a required length obtained by blending a water-permeable fiber and a water-impermeable fiber, It was decided to consist of either.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a civil engineering method using a water-permeable net according to the present invention will be described below with reference to the drawings. FIG. 1 is a partial perspective view showing a first embodiment of a water-permeable net used in a civil engineering method using a water-permeable net according to the present invention, and FIG. 2 is a partial cross-sectional view of FIG. First
The water permeable net 1 according to the embodiment has a net 2 as shown in the figure.
The water permeable fiber 3 is sprayed on the garbage and attached. FIG. 3 is a partial perspective view showing a second embodiment of the water permeable net used in the civil engineering method using the water permeable net according to the present invention, and FIG. 4 is a partial sectional view of FIG. The water-permeable net 1 according to the second embodiment is formed by winding a water-permeable fiber 3 around a net 2 as shown in the figure.

In the first and second embodiments, the net 2
Is composed of impermeable fibers. The material of the water-impermeable fiber is not particularly limited as long as it has excellent tensile strength and corrosion resistance. Polyester, polyvinyl chloride, polyvinyl acetate, polyvinyl alcohol,
Preferable examples include synthetic fibers such as polyethylene, polyamide, polypropylene, and polyurethane, and inorganic fibers such as metal fibers, glass fibers, and carbon fibers. As the water-permeable fiber 3, natural fibers such as cotton, hemp, silk, etc. are subjected to immortality treatment by adsorption of a preservative, a germicide, or fibers having holes 3a as shown in FIG. Is preferably used. FIG. 6 is a sectional view of FIG.
The method of providing the holes 3a of the fibers is not limited to the examples shown in FIGS. 5 and 6; for example, a configuration may be adopted in which holes are provided in a hollow cylindrical shape, or the fibers themselves may have water permeability. If it is possible, an arbitrary method of providing holes can be adopted as appropriate. Also, the method of attaching the water-permeable fibers 3 to the net 2 is not limited to the above example, and a method of attaching the water-permeable fibers 3 to the surface of the net 2 with an adhesive, a method of fixing by fusion, and the like. As long as the net 2 after the attachment of the fibers 3 can have water permeability, an arbitrary attachment method can be appropriately adopted.

In another embodiment of the water-permeable net ,
The impermeable fibers 3b are included in the water-permeable fibers 3 as shown in FIG.
As a preferable example, a fiber in which is used as a core material is formed into a net. In addition, about the water-permeable fiber 3 and the water-impermeable fiber 3b in these examples,
The materials exemplified in the first and second embodiments are preferably used .

[0012] The contact, in the present invention may be provided with a water-permeable net with a mesh material in place of the net.

As still another embodiment of the water-permeable net,
A water-permeable net made of fibers obtained by twisting the water-permeable fibers 3 and the water-impermeable fibers 3b of a required length as shown in FIG. 8 , or a relatively short water-permeable fiber as shown in FIG. A water-permeable net formed by using fibers of a required length obtained by blending the fiber 3 and the water-impermeable fibers 3b can be exemplified. The water-permeable fiber 3 is not particularly limited as long as it is a material having water permeability. Natural fibers such as cotton, hemp, silk, and wool, or immortalized treatment of these natural fibers by adsorbing a preservative or an antibacterial material. Can be suitably used. The water-impermeable fiber 3b is not particularly limited as long as it has excellent tensile strength and corrosion resistance. However, polyester, polyvinyl chloride, polyvinyl acetate, polyvinyl alcohol, polyethylene, polyamide, polypropylene, polyurethane, etc. Synthetic fibers,
Preferable examples include inorganic fibers such as metal fibers, glass fibers, and carbon fibers. Generally, water-permeable fibers such as natural fibers are excellent in water permeability, but weak in strength and not uniform in thickness. On the other hand, impermeable fibers such as synthetic fibers have excellent strength and a uniform thickness, but have poor water permeability. Therefore, as shown in FIG. 8 or 9 , by mixing or twisting the water-permeable fiber and the water-impermeable fiber, a fiber having water permeability and excellent strength can be obtained with a uniform thickness. Therefore, by constructing a net using the fiber obtained in this manner, the net material itself has water permeability, so even if the mesh is made fine, the water permeability is not hindered, and the strength is high. An excellent water-permeable net can be obtained.

Hereinafter, the working steps of the civil engineering method using the water-permeable net according to the present invention will be described. FIG. 10 is a diagram showing a method for improving soft ground, which is a first embodiment of the civil engineering method using a water-permeable net according to the present invention. The improvement of the soft ground is performed by laying the permeable net 1 on the ground 6 and then burying the earth and sand 7 from above. In some cases, this operation may be repeated several times. In this way, by laying the water-permeable net 1 and burying the earth and sand from above, the ground is uniformly pressed, a stable state can be obtained with less earth and sand, and the net itself becomes a reinforcing material. Strongly improved soft ground. In addition, since the water permeable net 1 is used between the landfill 7 and the ground 6, the drainage is excellent, and the excess pore water pressure does not work in the net portion even under an instantaneous load such as a traffic load, and the improvement by consolidation is achieved. The effect increases.

FIGS. 11 to 19 show an embankment method which is a second embodiment of the civil engineering method using a water-permeable net according to the present invention. In this method, the permeable nets 1 and 1 are laid on the ground 6 so that the ends 1a and 1b of the permeable nets extend outward from the position where the embankment is required. (See FIG. 11 ).
Next, the ends 1a and 1b of the water-permeable net are folded back and covered on the embankment 8 (see FIG. 12 ). By repeating the above steps from the state of FIG. 12 until the embankment is piled up at a certain height, an embankment of a required height as shown in FIG. 13 is completed.

FIGS. 14 and 15 show a modification of the second embodiment. In the embankment method of this modified example, first, the permeable net 1 is laid on the ground 6 at a position where embankment is required, and the embankment 8 is laid on the permeable net 1 ( FIG. 1 ) .
4 ). Next, the water-permeable net ends 1c and 1d are folded back and placed on the embankment 8 (see FIG. 15 ). FIG.
By repeating the above-mentioned process from the above state until the embankment is piled up at a certain height, the embankment of the required height is completed.

FIGS. 16 to 18 show another modification of the second embodiment. In this embankment method, first, the permeable net 1 is laid on the ground 6 at a position where embankment is required, and the embankment 8 is raised on the permeable net 1 (see FIG. 16 ). Next, the permeable net 1 is laid on the embankment 8 (see FIG.
17 ). Then, the above steps are further repeated thereon to complete the embankment of the required height as shown in FIG .

As described above, the embankment is performed using the water-permeable net 1 so that the interface between the embankments becomes the water-permeable net 1, and the rainwater is not obstructed from flowing even if a large amount of rainfall occurs. It is possible to reach from the embankment to the ground, and it is possible to avoid the danger that the embankment collapses and flows. In the illustrated example, only an example in which embankments are stacked in a trapezoidal shape is shown, but a method of stacking embankments substantially vertically as shown in FIG. 19 may be used.

FIG . 20 is a view showing a retaining wall method which is a third embodiment of the civil engineering method using a water-permeable net according to the present invention. When performing this retaining wall construction, after embankment is performed to a required height by the above-described embankment method, the retaining wall 10 may be provided on the base material 9 with concrete or the like. At this time,
It is preferable to provide drain holes 11 at a plurality of locations on the retaining wall 10 as shown.

As described above, when the retaining wall is constructed using the water permeable net 1, the embankments and the interface between the embankment and the wall become the water permeable net 1, so that even if a large amount of rainfall is encountered. Rainwater can reach the ground without obstructing circulation, and there is no danger that the retaining wall will be overturned by water pressure from the side or the earth and sand under the retaining wall will be washed away and the retaining wall will be overturned. Therefore, it is not necessary to fix the retaining wall to the ground deep in the ground unlike the conventional case, and the workability is excellent.

[0021]

As described above, the invention according to claim 1 is a civil engineering method for improving a soft ground by laying a permeable net on soft ground and covering the permeable net with earth and sand. And the water-permeable net is impervious
Net fitted with a water-permeable fibers to a net consisting of fiber, Toru
Fibers with impervious fibers as core material in aqueous fibers
A net made of a fiber obtained by twisting a water-permeable fiber and a water-impermeable fiber of the required length, a fiber of the required length obtained by blending a water-permeable fiber and a water-impermeable fiber Since the civil engineering method uses a water-permeable net, which is characterized by being composed of any one of the following, the following effects can be obtained. In other words, by laying a water-permeable net and burying the earth and sand from above, the ground is evenly pressed, a stable state is obtained with less earth and sand, and the net itself becomes a reinforcing material, and it is efficiently and firmly weak. The ground can be improved. Moreover, because a water-permeable net is used between the earth and sand, it has excellent water permeability,
Excessive pore water pressure does not work in the net part even by an instantaneous load such as a traffic load, and the improvement effect by consolidation increases.

According to a second aspect of the present invention, a water permeable net is laid on the ground, embankment is performed on the water permeable net, and the laid water permeable net is folded over the embankment and rolled up. By laying a water-permeable net, by repeating the process of embankment after processing in the same manner as described above, is a civil engineering method of embankment of a predetermined height, wherein the water-permeable net , from impermeable fibers Net with water-permeable fiber attached to the net, impervious fiber core in water-permeable fiber
A net made of fibers put as a material, a net made of fibers in which a water-permeable fiber and a water-impermeable fiber of a required length are twisted, and a required fiber obtained by blending a water-permeable fiber and a water-impermeable fiber Since it is a civil engineering method using a water-permeable net, which is characterized by being made of a net made of fiber having a length, the following effects can be obtained. In other words, by performing embankment using a permeable net, the interface between the embankments becomes a permeable net, and even if a large amount of rainfall occurs, rainwater can reach from the embankment to the ground without disturbing circulation. It is possible to avoid the risk that the embankment collapses and flows out.

According to a third aspect of the present invention, a step of laying a water-permeable net on the ground, performing embankment on the water-permeable net, further laying a water-permeable net on the embankment, and embankment is repeated. A civil engineering method for embankment at a predetermined height, wherein the water-permeable net is made of a net made of impermeable fibers.
Net fitted with a water-permeable fiber to the door, in a water-permeable fibers not
Fiber made of water-permeable fiber as core material is made into a net
A net made of fibers obtained by twisting a water-permeable fiber and a water-impermeable fiber of a required length, a net made of fibers of a required length obtained by blending a water-permeable fiber and a water-impermeable fiber, Since this is a civil engineering method using a water-permeable net, the following effects are obtained. That is, by performing embankment using a permeable net,
The interface between the embankments becomes a permeable net, and even if it is hit by a large amount of rainfall, rainwater can reach from the embankment to the ground without disturbing circulation, and it is possible to avoid the risk that the embankment collapses and flows out .

According to a fourth aspect of the present invention, a water permeable net is laid on the ground, embankment is performed on the water permeable net, the laid water permeable net is folded over the embankment and rolled up. After laying a water permeable net, and after performing the embankment of a predetermined height by repeating the step of performing the embankment after processing in the same manner as above, a civil engineering method of providing a retaining wall on the embankment wall surface, The water-permeable net is impermeable
Net fitted with a water-permeable fibers to a net consisting of fiber, Toru
Fibers with impervious fibers as core material in aqueous fibers
A net made of a fiber obtained by twisting a water-permeable fiber and a water-impermeable fiber of the required length, a fiber of the required length obtained by blending a water-permeable fiber and a water-impermeable fiber Since the civil engineering method uses a water-permeable net, which is characterized by being composed of any one of the following, the following effects can be obtained. In other words, by performing retaining wall construction using a water-permeable net, the embankments and the interface between the embankment and the wall surface become a water-permeable net, so that rainwater can be prevented from flowing even if a large amount of rainfall is encountered. There is no danger that the retaining wall will be knocked down by the water pressure from the side or the earth and sand under the retaining wall will be washed away by the water pressure from the side. Therefore, it is not necessary to fix the retaining wall to the ground deep in the ground unlike the conventional case, and the workability is excellent.

According to a fifth aspect of the present invention, a step of laying a permeable net on the ground, performing embankment on the permeable net, further laying a permeable net on the embankment, and performing embankment is repeated. after embankment of predetermined height, a civil engineering construction method for facilities retaining wall to the embankment wall, the permeability net, fitted with a water-permeable fibers to a net made of water-impermeable fibers nets, permeable fiber Impermeable fiber in the core
A net made of fibers put into the net, a net made of twisted water-permeable fibers and water-impermeable fibers of the required length, a required length obtained by blending water-permeable fibers and water-impermeable fibers Since it is a civil engineering method using a water-permeable net, which is characterized by being made of a net made of fiber having a length, the following effects can be obtained. In other words, by performing retaining wall construction using a water-permeable net, the embankments and the interface between the embankment and the wall surface become a water-permeable net, so that rainwater can be prevented from flowing even if a large amount of rainfall is encountered. There is no danger that the retaining wall will be knocked down by the water pressure from the side or the earth and sand under the retaining wall will be washed away by the water pressure from the side. Therefore, it is not necessary to fix the retaining wall to the ground deep in the ground unlike the conventional case, and the workability is excellent.

[Brief description of the drawings]

FIG. 1 is a partial perspective view showing a first embodiment of a water permeable net used in a civil engineering method using a water permeable net according to the present invention.

FIG. 2 is a partial cross-sectional view of the water permeable net of FIG.

FIG. 3 is a partial perspective view showing a second embodiment of the water permeable net used in the civil engineering method using the water permeable net according to the present invention.

FIG. 4 is a partial cross-sectional view of the water permeable net of FIG.

FIG. 5 is a diagram showing an example of an embodiment of a water-permeable fiber.

FIG. 6 is a sectional view of FIG. 5;

FIG. 7 is a cross-sectional view illustrating an example of an embodiment of a fiber constituting the water-permeable net.

FIG. 8 is a diagram illustrating an example of an embodiment of a fiber constituting the water-permeable net.

FIG. 9 is a diagram showing an example of an embodiment of a fiber constituting the water-permeable net.

FIG. 10 is a civil engineering method using a water-permeable net according to the present invention .
FIG. 3 is a diagram showing a first embodiment of the present invention.

FIG. 11 is a view showing a second embodiment of the civil engineering method using the water-permeable net according to the present invention.

FIG. 12 is a view showing a second embodiment of the civil engineering method using the water-permeable net according to the present invention.

FIG. 13 is a view showing a second embodiment of the civil engineering method using the water-permeable net according to the present invention.

FIG. 14 is a view showing a modification of the second embodiment of the civil engineering method using the water-permeable net according to the present invention.

FIG. 15 is a view showing a modification of the second embodiment of the civil engineering method using the water-permeable net according to the present invention.

FIG. 16 is a view showing another modification of the second embodiment of the civil engineering method using the water-permeable net according to the present invention.

FIG. 17 is a view showing another modification of the second embodiment of the civil engineering method using the water-permeable net according to the present invention.

FIG. 18 is a view showing another modification of the second embodiment of the civil engineering method using the water-permeable net according to the present invention.

FIG. 19 is a view showing another modification of the second embodiment of the civil engineering method using the water-permeable net according to the present invention.

FIG. 20 is a view showing a third embodiment of the civil engineering method using the water-permeable net according to the present invention .

[EXPLANATION OF SYMBOLS] 1 Permeability Net 2 Net 3-permeable fibers 3a hole 3b impermeable textiles 6 Ground 7 sand 8 embankment 10 retaining wall

Continuation of the front page (56) References JP-A-3-122318 (JP, A) JP-A-6-1993069 (JP, A) JP-A-61-172921 (JP, A) JP-A-61-60925 (JP) JP-A-6-185065 (JP, A) JP-A-6-2335 (JP, A) JP-A-60-30719 (JP, A) JP-A 61-188640 (JP, U) JP-A 61-188640 61-106544 (JP, U) JP 48-33102 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) E02D 17/18 E02D 3/02 101

Claims (5)

(57) [Claims] 1. A civil engineering method for laying a permeable net on soft ground and covering the permeable net with earth and sand to improve the soft ground, wherein the permeable net comprises:
A net with impermeable fibers attached to a net made of impermeable fibers.
The net is made of fibers obtained by twisting a water-permeable fiber and a water-impermeable fiber of the required length, a required length obtained by blending a water-permeable fiber and a water-impermeable fiber. A civil engineering method using a water-permeable net, comprising: a net made of fibers. 2. A permeable net is laid on the ground, embankment is performed on the permeable net, the laid permeable net is folded over and wrapped on the embankment, and a permeable net is further laid thereon. A civil engineering method for performing embankment of a predetermined height by repeating the process of performing embankment after performing the same treatment as described above, wherein the water-permeable net is made of an impermeable fiber.
Net with water-permeable fiber attached to net made of fiber, water permeability
Fibers with impermeable fibers as the core material
A net made of fibers obtained by twisting a water-permeable fiber and a water-impermeable fiber of a required length, a fiber of a required length obtained by blending a water-permeable fiber and a water-impermeable fiber A civil engineering method using a water-permeable net, comprising: 3. An embankment having a predetermined height by repeating a process of laying a permeable net on the ground, performing embankment on the permeable net, further laying a permeable net on the embankment, and embankment. In the civil engineering method, the water-permeable net is a net in which a water-permeable fiber is attached to a net made of a water-impermeable fiber, and the water-permeable fiber as a core material in the water-permeable fiber.
A net made of laid fibers in a net shape, a net made of twisted permeable fibers and impermeable fibers of required length, required length obtained by blending permeable fibers and impermeable fibers A civil engineering method using a water-permeable net, characterized by being made of any one of nets made of fiber. 4. A permeable net is laid on the ground, an embankment is performed on the permeable net, the laid permeable net is folded over the embankment, and the permeable net is further laid thereon. Then, after performing the embankment of a predetermined height by repeating the process of performing the embankment after processing in the same manner as described above, in the civil engineering method of installing a retaining wall on the embankment wall surface, the permeable net, Net made of impermeable fiber
Net fitted with a water-permeable fibers, opaque in the water-permeable fiber
Fiber made from water-based fiber as core material
A net made of fibers obtained by twisting a water-permeable fiber and a water-impermeable fiber of a required length, a net made of fibers of a required length obtained by blending a water-permeable fiber and a water-impermeable fiber, Civil engineering method using a water-permeable net characterized by consisting of 5. A permeable net is laid on the ground, an embankment is laid on the permeable net, and a permeable net is further laid on the embankment and the embankment is repeated. After performing, the civil engineering method of installing a retaining wall on the embankment wall, wherein the permeable net is made of an impermeable fiber
Nets with water-permeable fibers attached to a net consisting of
Fibers with impermeable fibers as the core material
A net made of fibers obtained by twisting a water-permeable fiber and a water-impermeable fiber of a required length, and a fiber of the required length obtained by blending a water-permeable fiber and a water-impermeable fiber A civil engineering method using a water-permeable net, comprising: