JPH0680249B2 - Reinforced embankment construction method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a reinforced embankment.

[0002]

2. Description of the Related Art Recently, in order to form a steep slope as steep as possible and to stabilize it, recently, a sheet-like anchor material having a large tensile strength is embedded in a plurality of layers in the embankment and the space between the embankment and the anchor material is increased. A method is used in which the anchor material is fixed in the embankment by the frictional force that acts on the pile, and the tensile force of the anchor material counters the sliding failure force of the slope to prevent the sliding failure of the slope surface.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
There are the following problems. That is, in the case of the method of embedding the anchor material having high tensile strength to stabilize the embankment slope as described above, the slope can be made steeper than that of the conventional embankment. However, if the slope is steep, the slope tends to collapse, so sandbags are piled up at the end of the embankment as clods, covered with sheet-shaped anchor material, and then rolled up into the embankment to wrap up the sandbag. Since the embankment work is carried out after stabilizing the work, labor is required for work such as packing sandbags and winding anchor material, and labor saving does not progress, and it is not possible to reduce costs as expected. There is.

[0004]

The present invention has been made to solve the above-mentioned problems, and provides a method of embankment that facilitates embankment work even at a steep slope and thus reduces costs. The purpose is to provide:
The present invention is to embed an anchor material having a large tensile strength substantially horizontally in the embankment, to erect a pile at a position slightly inside the shoulder of the embankment, and to connect this pile with the anchor material and to make a large number of piles. After installing or installing a dam plate between the piles, the embankment work for the next layer is performed.

[0005]

Embodiment 1 An embodiment of the present invention will be described in detail below with reference to the drawings. Anchor material The anchor material 1 is embedded in the embankment in the horizontal direction to stabilize the embankment against the arc slide of the embankment. The anchor material 1 is embedded horizontally in the embankment and has a planar shape, a strip shape, a linear shape, or the like. Planar anchor material The planar anchor material 11 is not particularly limited as long as it has a large tensile strength, such as a plastic net, a nonwoven fabric, a water-permeable mat, a steel plate. As shown in FIG. 2, the edge of the surface anchor material 11 on the embankment slope side is wound around a winding tube 21 and attached by a pin 22 or the like. Band-shaped anchor material The band-shaped anchor material 12 is obtained by dividing the planar anchor material 11 into a plurality of bands. These strip anchor materials 12
As shown in FIG. 3, the winding tube 21 is
Wind the edge of the embankment slope side and attach it with pins 22 or the like.

Linear Anchor Material As shown in FIG. 4, the linear anchor material 13 is a sacrificial body or the like having irregularities on the surface such as deformed reinforcing bars to increase frictional resistance. As the linear anchor material 13, a rod-shaped body to which a resistance plate or the like is attached, a steel rope, or the like can be used instead of providing irregularities on the peripheral surface. It is conceivable that a large number of the linear anchor materials 13 formed in this way are used and embedded in the embankment. However, since the linear anchor material 13 has a relatively small frictional resistance, the above-mentioned planar anchor material or strip anchor material is used. It is effective when used together with. It is also possible to use a planar anchor material and a strip anchor material together.

The pile 3 is directly or indirectly attached to the anchor material 1 and is erected on the embankment with a predetermined distance from the shoulder of the embankment. In some cases, a weir plate described later is attached. is there. Since the pile 3 blocks the embankment when unwinding the embankment, it is required to have a large second moment of area. In that sense, it is desirable to use a steel pipe, H-section steel, C-section steel or the like. In some cases, the surface of the slope is left as it is, and in this case, it is desirable that it has an excellent aesthetic appearance, and a pseudo wooden pile 31 made of concrete as shown in FIG. 5 is suitable. As shown in FIG. 6, the upper half may be a synthetic wood pile 31 and the lower half may be a composite pile 33 having a steel pipe 32.

Barrier plate The barrier plate 4 is attached to a pile to block the embankment before the embankment work is performed on the anchor material to prevent the soil from falling off. Lightweight, strong, water-permeable corrugated strip,
A net barrier is suitable. (1) Corrugated strip As shown in FIG. 7, using a zinc-plated steel sheet having a thickness of 1.6 mm as a material, by pre-notch roll forming,
It is composed of a band-shaped body 41 having a width of 10 cm and a height of 3 cm and having two corrugated cross-sections and having a length of 1 m, and a large number of water passage holes 42 are attached to each slope of the corrugation. (2) Net-shaped dam plate The net-shaped dam plate 43 is for the purpose of easily damming the soil, and is suitable for vegetation on the slope after the completion of the embankment. Although wire nets, plastic nets, knitted nets, etc. can be widely used, the one shown in FIG. 8 has a relatively large strength, and a water-permeable sheet of non-woven fabric or the like is formed on the inner surface of the zinc-plated metal net 44 having a coarse mesh to prevent the falling of soil. 45 is pasted together.

Construction of the first embankment The embankment foundation is the start of embankment construction and is intended to solidify the foundation of the embankment. As shown in FIG. 9, the ground forming the embankment is sufficiently compacted and flattened by using a roller or the like to form the embankment base 50, and then the anchor material 1 is laid horizontally on the embankment base 50. At the time of laying, the winding pipe 21 is attached to the end portion of the anchor material 1, and the winding pipe 21 is arranged along the sloped planned line of the embankment. Drive piles 3 vertically at 1m intervals along the Hojiri planning line. A weir plate 4 is installed in the transverse direction between the piles. The pile 3 and the winding pipe 21 are firmly joined together using the turnbuckle 23, and the anchor material 1 is pulled in the opposite direction and fixed to the embankment base 50 using the hook pin 24. To prevent the piles 3 from tilting outward due to earth pressure when unwinding the embankment, as shown in the figure,
It is effective to support the pile 3 from the outside by using the braces 25. It can be removed after the embankment is completed.
After such preparation, the embankment work is performed on the embankment base 50, and the compaction roller 52 is used to firmly compact it to complete the primary embankment 51.

Completion of the embankment As shown in FIG. 1, the anchor material 1 is placed on the primary embankment 51.
To lay. When laying, the winding tube 21 is attached to the end of the anchor material 1, and the winding tube 21 is attached to the primary embankment 5
No. 1 shoulder 53, which also hits the upper end of the pile 3,
A point 30 cm deep from is used as a pile planning line, and piles 3 are vertically driven at 1 m intervals along this planning line. Drive the pile firmly and deeply. A weir plate 4 is installed in the transverse direction between the piles. The pile 3 and the winding pipe 21 are firmly joined using the turnbuckle 23, the anchor material 1 is pulled in the opposite direction, and fixed to the primary embankment 51 using the hook pin 24.
As in the case of the first embankment, the braces 25 may be used to prevent the pile from tilting. When such preparation is completed, the embankment 5 on the first embankment is performed. Hereinafter, such work is repeated to complete the embankment body reinforced by the multilayer anchor material. A small step 5 is placed between the upper shoulder 53 of the embankment of each layer and the pile 3.
4 is formed.

The greatest purpose of the connection between the pile 3 and the anchor material 1 is to prevent the pile from being pushed out by the earth pressure of the embankment and moving by the tensile force of the canker material. Therefore, the connection between the two may be suppressed in the horizontal movement. From a long-term perspective, the anchor material laid in the upper layer is not only connected to the lower end of the pile erected on the layer, but also directly or through a spacer with a large tensile force, or the anchor in the lower layer. Indirectly connect the material to the upper end of the pile one step lower by unwinding the tip of the embankment and connecting it with the anchor material of the upper layer, so that the pile will not fall outside even after the embankment is completed. It is desirable to prevent it.

An example of the method of connecting the pile and the anchor material is as follows. As shown in FIG. 10, the connector 6 made of an L-shaped long member made of a galvanized steel plate is formed. The short side 61 is provided with bolt holes 62 at 5 cm intervals, and the long side 63 is provided with a large number of connecting protrusions 64 along the edge. The connecting protrusions 64 are inserted into the meshes at the end portions of the planar anchor material 11 to connect to the planar anchor material 11. Short side 6
A U-shaped bolt 26 is used to connect the pile 3 to the outside of the pile 1.
The pile 3 and the planar anchor material are connected to each other via the connecting tool 6.

Further, as shown in FIG. 11, cross-shaped cuts 14 for piles are provided on the planar anchor material 11. In order to compensate for the decrease in tensile strength of the planar anchor material due to the provision of the cut, a reinforcing plate 66 having a through hole 65 matching the size of the pile 3 is prepared in the galvanized steel plate, and the reinforcing plate 66 is provided around the cut 14. Just join them. By driving the pile 3 into the penetration hole 65, it is possible to suppress the movement of the pile 3 in the horizontal direction, that is, the tensile force.

[0014]

[Embodiment 2] A construction method using a tubular body will be described. The tubular body 7 is an auxiliary material for accurately driving the pile 3, and has an inner diameter that allows the pile 3 to be inserted with a margin. Usually 1 inner diameter
A steel pipe of about 0 cm is used. As shown in FIG. 12, the cylindrical bodies 7 are vertically driven at 1 m intervals along the Fushiri planning line on the embankment base 50 deep enough to fill the upper end of the embankment base 50. The pile 3 is inserted into the tubular body 7, and early strong mortar 71 is injected around the pile 3 to fix it while adjusting the verticality of the pile 3. The pile 3 is made to protrude by the height of the embankment of the next layer. A weir plate 4 is attached to the back surface of the pile 3. The planar anchor material 11 is laid horizontally on the embankment base 50.

Subsequent to the above work, the cylindrical body 7 of the next layer is erected at a position spaced from the pile 3 by 30 cm. The tubular body 7 and the pile 3 are fixed to each other at two upper and lower positions via spacers 27. The height of the tubular body 7 should be slightly lower than the planned embankment height,
The upper surface is covered with a cover 72 to prevent dirt from entering. After preparing in this way, the first embankment 51 is constructed. The embankment should be compacted by sufficient compaction. When constructing the embankment of the next layer, the cover 72 of the tubular body 7 is ruptured, the pile 3 is inserted, and the mortar is used to fix the same.
Build the entire embankment.

As shown in FIG. 13, a low pile 3 is erected on the embankment base 50, and a corresponding low tubular body 7 is erected on it.
Fill 5 up to this height. Then, the pile of the anchor material 1 and the anchor material 1 is divided into a plurality of embankments 5 layers by repeating the operation of inserting and standing the pile in the tubular body 7 and standing the tubular body in parallel. Is also possible. A small step 54 is formed for each 5 layers of embankment. In such a case, the pile 3 and the tubular body 7 can be preliminarily joined in parallel with each other by using a spacer 27 as shown in FIG. 14, which improves the construction efficiency.

[0017]

[Embodiment 3] A construction method using a frame will be described. Frame 8
Is used when piles cannot be driven into the ground. Figure 1
As shown in FIG. 5, two piles 3 made of lip-grooved steel 34 are arranged at intervals of 1.2 m so that the groove portions 35 face each other to form a pair. A base frame member 81 is joined to the lower end in the orthogonal direction. The inner corners are reinforced with braces 25 to ensure a right angle. The base frame members 81 are connected by two connecting frame plates 82 to complete the frame body 8.

As shown in FIG. 16, the frame body 8 is installed so that the foundation frame material is on the inside in accordance with the sloping plan line on the embankment base 51. Adjacent frame members connect the foundation frame material and the pile members with bolts and nuts. The corrugated belt-like body 41 is dropped into the facing groove portion 35 to form the dam plate 4 on the entire surface. Laying the planar anchor material 11 on the embankment base 51,
A long anchor material is used, which is connected to the lower end of the dam plate 4, and the surplus portion is wound up on the back surface of the dam plate 4. After performing the primary embankment 51, the surplus portion of the anchor material is rewound onto the embankment. The ends of the anchor material are connected by hook pins 24 that are common to the anchor material of the next layer. On the primary embankment 51, the frame body 8 is installed slightly inward from the shoulder 53, and the same construction as above is performed to complete the embankment. When constructed in this way, the frame body 8 is pulled by the anchor material so that it is not pushed out to the outside, and at the same time, it is suppressed by the embankment weight on the foundation frame material 81 and the connecting frame plate 82, so it falls down to the outside. Never. Further, since the planar anchor material 11 wraps the embankment, the earth pressure applied to the dam plate can be reduced.

Other Cases In the examples, piles were erected at intervals, and a weir plate was installed between the piles to perform embankment. However, as shown in FIG.
The artificial wood piles 31 can be installed upright in parallel. In this case, it is desirable that the piles be connected to each other on the rear surface by a horizontal connecting plate. When it is desired to green the embankment slope, a method is possible in which the net-shaped dam plate 43 is used as a dam plate for embankment and vegetation seed paper is attached to the back surface of the dam plate. Further, it can be realized by making a gap between the piles or using a dam plate having holes. Since the step 54 between the shoulder and the pile of each layer is also horizontal, it is suitable for vegetation and planting.
The frame body 8 may be formed by bending an expanded metal 83 at a right angle as shown in FIG. If you connect the two bent sides using the turnbuckle 23,
It is convenient to correct when the embankment surface to be installed is uneven or the surface is inclined due to the pressure of the embankment.

[0020]

Operation of the present invention It is considered that the earth pressure is strongly pressed from the inside during the embankment work. However, with the construction of the present invention, the pile is connected to the anchor material deeply buried in the embankment and having a large tensile force. Therefore, it is not pushed out by the frictional force acting between the anchor material and the embankment.

[0021]

The present invention can obtain the following effects. (1) Normally, when forming a fill slope, the gradient is set to 20 to 10 minutes, but since the present invention is reinforced with an anchor material having high tensile strength, it is possible to reliably prevent collapse of the fill. Therefore, this gradient can be set to about 10% to 3 minutes, the land that can be effectively used can be expanded, and the amount of soil to be transported is small, which has a large economic effect. (2) By attaching the piles or the dam plate to the anchor material, the dam plate can be stabilized, and even if the embankment slope is not formed by the sandbag, it is possible to prevent the soil from spilling on the embankment surface and facilitate the embankment work. (3) By omitting the sandbag stacking work and the anchor material winding work, the work can be speeded up, the number of personnel can be reduced, and the cost can be reduced. (4) Since the normal gradient as a whole can be determined by the height and depth of the small steps, the embankment work with an accurate gradient can be performed. (5) Unlike the conventional vertical embankment method, embankment with an arbitrary slope is possible. (6) Unlike the conventional vertical embankment method, it does not require a retaining wall standing on a large-scale foundation on the surface of the embankment, and the construction can be performed easily, so the cost can be reduced. (7) The surface wall is not limited to the rigid plate as in the conventional vertical embankment method, and can be arbitrarily selected. (8) Most of the planar anchor materials are synthetic resins and synthetic fibers, and when used on the surface of the embankment slope, flammability was sometimes a problem. It is convenient to use a non-combustible forest material for the pile and the dam plate of the present invention because the surface of the embankment slope becomes non-combustible. (9) It is possible to green the entire surface as well as the small steps.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a method of constructing an embankment.

FIG. 2 is an explanatory diagram of a planar anchor material.

FIG. 3 is an explanatory diagram of a band-shaped anchor material.

FIG. 4 is an explanatory diagram of a linear anchor material.

FIG. 5 is a perspective view of a pseudo wood pile.

FIG. 6 is a perspective view of a composite pile.

FIG. 7 is a perspective view of a dam plate having a corrugated band.

FIG. 8 is a perspective view of a net-like dam plate.

FIG. 9 is an explanatory diagram showing a method of constructing the first embankment.

FIG. 10 is an explanatory diagram showing a method of connecting a pile and an anchor material.

FIG. 11 is an explanatory view showing another method of connecting the pile and the anchor material.

FIG. 12 is an explanatory diagram showing another example of a method of constructing an embankment.

FIG. 13 is an explanatory diagram showing a method of forming small steps.

FIG. 14 is a perspective view of a pile in which tubular bodies are joined in advance.

FIG. 15 is an explanatory diagram showing a formation state of a frame body.

FIG. 16 is an explanatory diagram showing another example of a method of constructing an embankment.

FIG. 17 is an explanatory diagram showing a situation of installing piles.

FIG. 18 is a perspective view of another example of the frame body.

Claims (8)

[Claims] 1. A reinforced embankment method for laying a plurality of layers of anchor material in a horizontal direction, in which an anchor material having a high tensile strength is laid substantially horizontally on an existing embankment and is measured at a predetermined distance from the shoulder of the existing embankment. A method of constructing a reinforced embankment, in which piles are continuously erected on the embankment, the pile and the anchor material are connected, and then the embankment work for the next layer is performed. 2. A reinforced embankment method for laying a plurality of layers of anchor material in a horizontal direction, in which an anchor material having high tensile strength is laid substantially horizontally on an existing embankment, and the embankment is located at a predetermined distance from the shoulder of the existing embankment. In, a plurality of piles are erected at a predetermined interval, while connecting the pile and the anchor material,
After installing the weir plate on the pile, perform embankment work on the next layer,
Construction method of reinforced embankment. 3. The method of constructing a reinforced embankment according to claim 1, wherein the pile is also connected to an anchor material embedded under the uppermost embankment of the existing embankment. 4. When embedding a pile, a tubular body is erected at a position inside a predetermined distance from the pile, and the tubular body is connected to an anchor material laid on the embankment before embankment work. When performing the embankment work of the next layer, the pile is inserted into the tubular body and fixed at a predetermined position to stand the pile.
The method for constructing a reinforced embankment according to claim 1. 5. The method for constructing a reinforced embankment according to claim 4, wherein the pile and the tubular body are preliminarily joined in parallel at a predetermined interval. 6. The anchor material is a planar anchor material,
It was connected to the pile at the point of rooting the pile, and its extension was rolled up along the inner surface of the pile and the weir plate, rewound inward at the upper edge of the embankment and laid on the next layer of embankment. The characteristic method of constructing a reinforced embankment. 7. The method according to claim 1, wherein a gap is provided between the piles forming the embankment surface or between the piles or on the surface of the dam plate, and vegetation is performed through the gaps.
The method of construction of the reinforced embankment described. 8. The construction of a reinforced embankment according to claim 1, wherein vegetation or planting is performed on the step formed between the shoulder of the embankment and the pile of the next layer. Method.