JPH05112939A - Filling formation method and wire net with frame - Google Patents

Abstract

PURPOSE:To prevent a breakdown by shearing in the vicinity of the face of slope of filling and to form the filling having a steep slope. CONSTITUTION:A large number of framed wire nets 1 are connected lengthwise and breadthwise and are spread over the ground, and rows of framed wire nets 2 connected to the ends thereof are raised up to form an L-shaped slope formation section. Soil is displaced thereon and is rolled to form a displaced soil layer. The operation is repeated to bury the wire nets in layer structure, and the filling having a slope reinforced with wire nets and required height is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a method of forming an embankment in which a net-like body is embedded in a layered manner in an embankment portion, and in particular, it is easy to construct a steep slope with a frame wire mesh connected. The present invention relates to a method of forming embankment that can be formed, and a framed wire mesh used in the method.

[0002]

2. Description of the Related Art The embankment method is generally widely used for road and track construction or residential land development. However, because the soil transported from other places is piled up (guest soil), the slope of the slope is steep, the internal friction of the embankment material, the decrease of adhesive force, the increase of water content, etc. tend to cause the embankment's destruction phenomenon. .. In addition, when a load is applied, there is a drawback that the shoulder portion tends to collapse.

There are two basic ways to solve this problem. One is to adopt a retaining wall work or a slope frame work, and the other is to take a gentle slope on the slope. However, the former requires enormous cost and a long construction period, and the latter requires a large area, which also increases the cost and may be impossible in terms of location.

Therefore, as the second best measure, in the embankment method, a reinforcing net such as a resin net or a woven net is embedded in layers in the embankment portion to prevent shearing of the soil due to the tensile resistance of the net and to stabilize and strengthen the embankment. Is widely practiced. This is because the frictional force acts between the soil constrained in the mesh of the net and the soil above and below the net, and lateral movement of the embankment is suppressed, so that shearing of the soil is prevented, and the tensile force and shearing of the net are also prevented. It focuses on reinforcing the embankment structure by the resistance force.
The resin net is a long strand of thick strands extruded using polyethylene or polypropylene resin, and the woven net is made of a nylon or polyester laying yarn, which is used as a large-scale knitted fabric (woven net). All are resin-processed and cut into appropriate lengths and laid on the entire embankment area or on the shoulders of the embankment, and soil is laid on the embankment with a uniform thickness of several tens of cm to 1 m.

[0005]

However, these nets are rather flat and the frictional force with the soil is insufficient. Furthermore, resin nets generally have low tensile strength and thick strands with a large amount of resin are expensive and difficult to use. In addition, the cost of the woven net is high, and since the warp and wefts are simply solidified with resin, if a crack or the like occurs, the warp pressure of the embankment tends to cause the warp to displace at the cracked portion, and a sufficient reinforcing effect cannot be obtained. There is.

In order to eliminate these drawbacks, a method of protecting the slope portion with a special form or the like has been proposed. For example, in Japanese Unexamined Patent Publication No. 3-51424, a plastic net is laid on the ground, and a mold in which a grid-like member is integrated between L-shaped frames is installed in a slope forming portion to fill soil. A technique for wrapping and reinforcing the form at the end of the net-like material after rolling is disclosed. This method certainly increases the reinforcement of the slope. However, since the design inclination angle of the slope changes variously depending on the place, soil quality, etc., it is impossible to prepare an L-shaped frame having an angle corresponding to this. Further, since the L-shaped frame is bulky, it is costly to carry. Also, sandbags are piled up on the slope to reinforce. However, it takes a lot of manpower to stuff the bags with sand and sandbags and to pile up the sandbags, and the construction period is prolonged.

[0007]

Therefore, the present inventor has focused on a wire net which is three-dimensional, has a large frictional force with soil, has a large tensile strength, and is significantly cheaper than a net, and tried to use it. .. However, expanding and fixing the wire mesh on the ground requires skill higher than that of the net, and there are also drawbacks such that the mesh of the wire mesh is greatly displaced by tension. In order to solve this problem, the wire mesh is cut to an appropriate size, and a frame is attached around it to form a framed wire mesh, and a large number of this framed wire mesh are connected and the slope forming part is formed by part of them. ..

That is, according to the embankment forming method of the present invention, a large number of framed wire nets, each having a wire net stretched in a rectangular or rectangular frame, are laid on the ground by connecting them in the vertical and horizontal directions, and one line of the end portion is provided. To form an L-shaped slope surface forming part, and soil is deposited on the connected frame-equipped wire mesh and inside the slope forming part to form a single soil layer. To do. Next, a large number of framed wire nets are similarly connected and laid on the surface of the rolled compacted soil layer, and the same operation is repeated in sequence to form an embankment of a predetermined height. By doing so, the wire mesh can be easily handled and the deformation of the mesh can be reduced, and the slope can be reinforced by the framed wire mesh connected to the framed wire mesh in the soil layer. In addition, for the framed wire netting of the slope part, if the upper edge of the framed wire mesh of the lower layer and the vicinity of the lower edge of the framed wire mesh of the upper layer are connected in the same manner, the sloped part is more protected. To be strengthened.

In the present invention, the framed wire mesh has a cross section of L
Assemble molds and U-shaped angles into a rectangular or square frame,
The wire mesh is tightly stretched and fixed inside. As for the size of the wire mesh with a frame, the larger it is, the less labor is required to lay it,
It is heavy and there are restrictions on transportation by car, so the width is usually 2 m.
The length is about 3 to 5 m in the front and rear. Since the thickness of one soil layer is about several tens of centimeters, the width for slope formation is about several tens to 1 m. If necessary, a reinforcing bar may be provided on the frame body, and it is desirable to carry out a rust preventive treatment such as Zn plating. On the other hand, the wire mesh is made of wire having a thickness that is generally used for fences, for example, 1 to 5 mm, usually around 3 mm, and is woven into 3 to 10 cm, more preferably 4 to 5 cm. As the wire, it is preferable to use a wire that has been subjected to a known rustproof treatment such as Zn plating or plastic coating. Further, it is preferable that the side edges of the wire mesh have a separation preventing finish such as a knuckle finish.

The framed wire mesh is subjected to a tensile load of several tons per 1 m in width. Therefore, it is necessary to fix the wire mesh to the frame by tensioning it so strongly. For example, the edge of the wire mesh is clamped between the angle and the push plate that will be the frame body and bolted, or the edge of the wire mesh is wound around a plate or rod and fitted into a U-shaped frame material and fixed by tightening. Etc.

The framed wire netting is laid on the ground rock or on the surface of the soil layer of the customer which is compacted by laying soil, and at this time, the framed wire nettings are connected so as not to move to each other. It is necessary to make the connection as strong as the above. For example, it is performed by tightening bolts, binding with wires, or using various connecting fittings.
From the standpoint of construction efficiency, it is preferable to use a C-type hook that can be connected with one touch. Further, in order to prevent the entire framed wire mesh connected to each other from moving, the framed wire mesh may be fixed with an anchor or the like.

Next, one of the end portions of the framed wire mesh connected in series is
A row is raised and fixed at a predetermined angle to form a slope forming portion. This fixing is done by using angles or reinforcing bars, etc. between the frame body of the framed wire mesh and the frame body of the horizontal framed wire mesh to withstand earth pressure, tightening with bolts or binding with wires or use of various connectors as described above. By. It is also conceivable to use a bar with hooks at both ends. Then, after the soil is transferred to this portion and the compaction is performed, the upper edge of the framed wire netting caused by this and the lower edge of the framed wire netting of the slope forming part of the upper layer are connected to each other, so that the sloped surface becomes stronger. Formed in. By repeating these operations, the embankment is completed by stacking a plurality of layers of the soil layers to a predetermined height.

The framed wire mesh may be laid on the entire surface such as on the ground, but may be laid only from the inner side of the assumed collapse line to the shoulder portion. In addition, as in the case of constructing a highway on a flat ground, when both sides of the embankment are downslopes, a framed wire mesh may be connected and laid only on both sides, and a wire or the like may be connected between them. .. Further, at the time of construction, a gravel layer, a vegetation mat or the like can be arranged inside the slope forming portion. This vegetation mat also functions to prevent spillage of earth and sand from the mesh of the wire mesh on the slope. Not limited to the vegetation mat, it may be a simple non-woven fabric or the like, but if some kind of planar soil retaining member is attached to one side of the framed wire mesh that is to be the slope forming part in advance, the soil retaining member such as the vegetation mat will be inserted on site. No equipment is required and construction efficiency is improved.

[0014]

Next, the present invention will be described in detail based on the embodiments shown in the drawings. FIG. 1 shows an example of a framed wire mesh according to the present invention. The framed wire mesh 1 has a width of about 240 cm and a length of about 5 m, and is composed of a Zn-plated L-shaped angled frame body 11 and a wire mesh 12 of Zn plated and resin-coated 3.2 mmφ wire. The surroundings are sandwiched by the holding plate 13 and the screw 14
It is stretched and fixed with. The frame body 11 is provided with connecting through holes 15 and anchor through holes 16 at appropriate intervals. The framed wire netting 1 is laid on the surface of the ground G or the soil layer K.

FIG. 2 shows a state in which a large number of framed wire nets 1 are connected vertically and horizontally and laid on the upper surface of the ground G. In addition, a framed wire netting 2 for forming a slope, which has the same structure and a width of only about 1 m, is connected to its end portion (state shown by a chain line in FIG. 2). In this example, the C-type connecting fitting 3 shown in FIG. 3 is used to connect the framed wire nets to each other. This is one in which the bent portions at both ends are inserted into the connecting through holes 15 of the adjacent frame bodies 11 and are connected with a certain degree of freedom, but of course the invention is not limited to the illustrated one. Although not shown in the figure, instead of the connecting fitting 3, a large number of hooks are provided on the outside of the one frame body 11, and the hooks are inserted into the connecting through holes 15 so that they can be connected with a single touch. it can. If necessary, the anchor 17 is inserted into the through hole 16 for the anchor, and the entire framed wire net connected to the anchor 17 is fixed to the ground G.

When the laying of the framed wire netting 1 and the framed wire netting 2 is completed over a certain range, the lined framed wire nettings 2 are caused (state shown by the solid line in FIG. 2), and the required slope is obtained. At a certain angle, the framed wire netting 2 is fixed to the adjacent framed wire netting 1 to form a slope forming portion. For this fixing, in this example, a fixing connector 4 having hooks 42 at both ends of a reinforcing bar 41 is used,
The hooks 42 are hooked in the through holes 18 for fixing the normal portion of both the frame bodies 11 so that the hooks can be operated with one touch. When the turn puckle 43 is provided in the middle of the reinforcing bar 41, the fixed connector 4
It is possible to adjust the length, and thus the angle θ of the slope. This angle θ can be increased to 70 to 80 degrees, depending on the soil quality and the like. Next, as shown in FIG. 4, earth and sand are deposited on the laid framed mesh 1 and on the inside of the framed mesh 2 serving as a slope forming portion to compact the first soil layer K1. ..

Similarly, a large number of framed wire nets 1 are connected vertically and horizontally on the surface of this soil layer K1 to raise the framed wire nets 2 to form the slope forming portion of the next soil layer K2. At this time, the lower soil layer K
When the upper edge 2a of the framed wire netting 2 of No. 1 and the lower edge 2b of the framed wire netting of the soil layer K2 are similarly joined by the connecting metal fitting 3 or the like, the slope is more strongly protected. Thus, the compaction with the desired height is completed by repeating compaction with the soil and laying and connecting the wire mesh with the frame. This embankment 5 has at least a collapse line 5
A layered framed wire mesh array extending inside 1 is buried. A water drain 52 or the like is arranged on the slope portion as necessary.

FIG. 5 shows another example in which a vegetation mat 6 is arranged on the slope of the embankment 5. By arranging the vegetation mats 6 in this way, the labor for vegetation after the completion of the embankment 5 is saved, and the cost is greatly reduced. Further, the vegetation mat 6 also acts as a retaining soil to prevent the soil on the slope from spilling out from the mesh of the wire mesh. Regarding the soil retention, not only the vegetation mat 6 but also any plain material such as a simple non-woven fabric or Mushiro can be used as the soil retention member. Figure 6
Indicates that the soil retaining member 7 is attached to one side of the framed wire net 2 for forming a slope in advance with a binding wire 71 or the like.
The use of the framed wire net 2 is convenient because the soil retaining members 7 such as the vegetation mat 6 can be transported separately and can be saved during the construction. Note that a gravel layer or the like may be provided inside the sloped portion of the embankment 5 instead of the vegetation mat.

FIG. 7 shows a modification of the state in which the wire mesh is stretched and fixed to the frame. First, in FIG. 7A, in the above embodiment,
Protrusions 19 are provided on the holding plate 13, and the protrusions are used to hook the edges of the wire mesh to prevent the retainer from coming off. Figure 7
In (b), the edge of the wire mesh is wound around the presser bar 20, and the wire mesh is fitted into a U-shaped frame body and fixed with bolts 21. Although these can more firmly fix the wire net, the wire net is not limited to those shown in the drawings. The point is that the shearing stress and the tensile force applied to the wire mesh can be dispersed over the whole to prevent the stress from being concentrated.

[0020]

As described above in detail, in the embankment forming method of the present invention, a large number of framed wire nets having appropriate dimensions are connected in the vertical and horizontal directions to be laid on the ground, and one row of the end portions is arranged. This is an L-shaped slope forming part, in which earth and sand are applied as soil and compacted to form a soil layer, and this operation is repeated to form an embankment of a required height.

Therefore, since the wire nets can be built up in layers in the embankment simply by arranging and connecting the framed wire nets, the time and labor required can be greatly reduced as compared with the case where the wire nets are laid as they are, and the skill is not required. Even if it can be laid evenly. In addition, the wire mesh itself is superior in strength to conventional nets, and since the unevenness is large, the friction with the soil becomes large, and the frame itself also shows great resistance to the movement of the soil, so shearing of the soil layer and this More effectively prevent collapse near the slope. In addition to this, since one end of the laid framed wire netting is raised and used as the slope forming portion, it is more effective than simply reinforcing the netting. Moreover, since the slope portion can be reinforced without the need for an L-shaped frame for slope protection, it is possible to easily form an embankment with a steep slope at a low cost, and the entire slope is a wire mesh. Since it is covered with vegetation, it can be said that it is an extremely excellent embankment method because it has a great effect of holding sprayed objects such as vegetation and mortar. In addition, if a vegetation mat or other soil retaining member is attached to one side of the framed wire mesh in advance on the slope forming part, the vegetation mat can be transported separately or the vegetation mat can be inserted in front of the soil. It is convenient because it does not need to be attached.

[Brief description of drawings]

FIG. 1 is an enlarged perspective view of a part of a framed wire mesh according to the present invention.

FIG. 2 is a perspective view showing a state in which framed wire nettings are connected and laid, and a slope forming portion is erected.

FIG. 3 is a plan view showing an example of a connecting fitting.

FIG. 4 is a cross-sectional view showing an example of embankment.

FIG. 5 is a cross-sectional view showing another example of embankment.

FIG. 6 is a cross-sectional view showing another example of the framed wire mesh.

7 (a) and 7 (b) are partially enlarged cross-sectional views showing different states in which the wire mesh is stretched and fixed to the frame body.

[Explanation of symbols]

 1 Wire mesh with frame 11 Frame 12 Wire mesh 15 Through hole for connection 2 Wire mesh with frame for slope formation 3 Connection metal fittings 4 Fixing connection tool 5 Filling 51 Collapse line 6 Vegetation mat 7 Earth retaining member G Ground K Customer soil layer

Claims (2)

[Claims] 1. A rectangular or rectangular frame-shaped wire mesh is stretched over the ground by connecting a large number of framed wire meshes connected to each other in the vertical and horizontal directions and at a predetermined angle by raising one row of the end portions. As an L-shaped slope forming part, and the earth and sand are applied as soil on the framed wire mesh connected to the inside and inside the slope forming part, and the frame is similarly attached on the surface of the pressed soil layer. A method for forming embankment, which comprises laying a plurality of wire nets connected to each other and repeating the same operation to form an embankment having a predetermined height. 2. A framed wire netting characterized in that an earth retaining member is attached to a wire netting portion of a framed wire netting in which a wire net is stretched in a rectangular or square frame.