JPH08338023A - Grating crib connecting member and reinforced embankment method - Google Patents

Abstract

PURPOSE: To safely form a reinforced embankment by a method wherein a grating crib connecting part of a grating crib connecting member is formed to have a groove or a hooking part adapted to be engaged with an end of a grating crib. CONSTITUTION: An end of a geotextile 2 is connected to a concrete block 3 of a grating crib by means of a connecting member 1. And the geotextile 2 is horizontally embedded in an embankment, whereby a tensile shearing resistance against a breakage due to rotational slip of embankment is provided and excessive pore water in the embankment can be discharged so that the strength of material of the embankment increases, and hence the embankment can be stabilized. The geotextile 2 to be laid has a flat belt-shape with staggered patterns. The connecting member, as a means to easily connect such geotextile and grating crib at a site, can arrange adjoining grating cribs in a straight pattern.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is extremely simple and
The present invention relates to a connecting member for engaging a geotextile with a glue frame and a reinforcing embankment method using the same, which is used in a safe embankment method that can be safely formed.

[0002]

2. Description of the Related Art In recent years, efforts have been made to form a stable embankment in view of the current state of construction where steep slopes and high embankments are being used. A multi-layered geotextile (grid of tensile reinforcement and non-woven of horizontal drainage) is laid in the direction to increase the strength of the embankment by imparting tensile shear resistance against circular arc sliding failure of the embankment and draining excess pore water in the embankment. The intended reinforcement embankment method is used.

Japanese Patent Publication No. 5-47688 has been proposed as a technique using such a geotextile and a glue frame. However, in this method, a rod-shaped body is fitted into the glue frame, and the end portion of the geotextile is bitten and fixed by the rod-shaped body, which is extremely troublesome and time-consuming, and the rod-shaped body is fitted. The holes had to be provided in the plane of the frame, and the holes had the drawback of being extremely susceptible to stress.

[0004]

DISCLOSURE OF THE INVENTION The present invention is extremely simple and can rationally fix geotextiles on a reinforced embankment construction site, and also allows steep slopes and high embankment work at low cost. The present invention provides a glue frame connecting member capable of forming a reinforced embankment that is safe and secure, and a reinforced embankment method using the same.

[0005]

The present invention employs the following means in order to solve the above problems.

The glue frame connecting member of the present invention is a connecting member for connecting the geotextile to the glue frame in the reinforced embankment method, and the connecting member comprises a glue frame connecting portion and a geotextile fixing portion, and the glue frame The connecting portion has a structure that fits into the glue frame, and the geotextile fixing portion is characterized by having a pin-shaped fixing member or a wedge-shaped jig and the jig fixing portion. The embankment method is the reinforcement embankment method, in which the step of installing the glue frame, the step of embankment in the glue frame, and the step of attaching the glue frame connecting part of the glue frame connecting member to the glue frame, and then fixing the geotextile of the connecting member It is also characterized in that the four steps of engaging the geotextile on the surface of the part are defined as one unit process and the process is repeated one or more units to form a reinforced embankment. It is.

[0007]

In the reinforced embankment method using a grate frame, the present inventor has found that the circular slip failure of the embankment that occurs on a daily basis, the resulting tensile shear failure, and the reduction of the strength of the embankment due to the failure to reach the drainage of excess pore water in the embankment. We have diligently studied whether there is a safe, reliable, and reliable solution to the problems at once, and found that this can be achieved by engaging the geotextile with the glue frame using a specific connecting member. It is a thing.

The glue frame connecting member of the present invention is constructed based on such a technical idea, and therefore has an extremely simple and clear engagement mechanism. That is, the glue frame connecting portion of the glue frame connecting member may be a structure having a groove or a hook that is a structure that fits into the end portion of the glue frame, and as such a structure, for example, a U-shape, A structure selected from H-shape, L-shape, T-shape or a combination thereof can be used.

Although the geotextile fixing portion is provided on the glue frame connecting portion to form the connecting member of the present invention, the connecting portion and the fixing portion may be integrally formed. , May be separately formed and connected, and the fixed portion may be movable vertically or upwardly or immovably. As long as it is movable, the geotextile can be fixed without problems even if the height of the embankment rises or falls slightly. The surface of the fixing portion has a lattice shape, and a wedge-shaped jig is driven therein to fix the geotextile. The wedge shape may be any shape having a hook at the top, such as a U-shape or a T-shape.
On the other hand, the one having a pin-shaped projection provided on the surface of the geotextile fixing portion is preferably a shape having a large number of such projections, for example, a shape like a male shape of a surface fastener, or a mesh-like non-grid such as a geogrid. The cloth can be hooked on the hook-shaped projections to be connected and fixed.

The wedge-shaped jig is engaged with the surface of the geotextile fixing portion while being pushed in through the geotextile. In this case, the fixing portion is required to be pierced by the wedge-shaped jig, and therefore, a material having rigidity corresponding to it and strength that opposes the tensile strength is used. As the geotextiles used, various fibrous structures such as mesh, lattice, woven and knitted and non-woven fabrics, and composite materials impregnated with these are used to enable the wedge jigs to be engaged. Can be

The material of each member constituting the connecting member of the present invention can be made of a metal having rigidity. Among these materials, corrosion-resistant metals such as stainless steel or rust-prevented metals are preferably used.

On the other hand, the glue frame is composed of at least one kind which is usually used, for example, selected from concrete, resin and metal.

The glue frame connecting member of the present invention is used in a usual reinforced embankment method. Fixing in that case, the step of installing the glue frame, the step of embankment in the glue frame, and the step of attaching the glue frame connecting portion of the glue frame connecting member to the glue frame, and then on the surface of the geotextile fixing portion of the connecting member. It is constructed in a process in which the four steps of engaging the geotextile are one unit. The reinforced embankment method of the present invention repeats this process for one unit or more to form a reinforced embankment. In such a process, the position where the glue frame connecting portion of the glue frame connecting member is attached to the glue frame may be attached to the upper end portion of the glue frame or may be either the lower end portion of the next glue frame or the joining member. It may be appropriately adopted according to the function of the glue frame connecting portion.

By specifying the upper and lower end portions of the glue frame, it is possible to freely select a means for engaging the geotextile without lowering the strength of the glue frame. It acts to apply tensile tension to the glue frame. Therefore, as a connecting member for fixing such a geotextile, if it is hooked on the end portion of the glue frame, it will maintain a sufficiently fixed state. Next, the present invention will be described in detail with reference to the drawings.

FIG. 1 exemplifies a cross-sectional state in which the end portion of the geotextile 2 is connected and locked to the concrete block 3 of the glue frame by the connecting member 1 of the present invention. Geotextile 2 is embedded horizontally in the embankment,
The purpose of this is to increase the strength of the embankment material and stabilize the embankment by imparting tensile shear resistance against circular arc slip failure of the embankment and draining excess pore water in the embankment. The geotextile 2 to be laid has a planar shape or a staggered strip shape. Figure 2 is a concrete block 3 of the glue frame, but there are various types. Here, the soil of the embankment material is a hollow rectangular shape considering drainage of surplus pore water in the embankment from the slope and vegetation of the slope. It was exposed type. FIG. 3 shows a connecting member 1 according to the invention and a U-shaped wedge 4 which is driven to fix the laid geotextile to the connecting member. In the connecting member 1, a is a hinge portion, and b is a grid-like fixing portion which is a mesh-like geotextile fixing portion of the connecting member. Here, the hinge part a corresponds to the embankment gradient and the geotextile reinforcement material laid horizontally in the embankment or the geotextile drainage material laid with a 2-5% gradient in the embankment. . In addition, the grid-shaped fixing portion (mesh shape) b is a geotextile laid on the connecting member 1 and has a U-shaped wedge 4.
It can be fixed at any position by tapping. The connecting member 1 and the U-shaped wedge 4 are preferably made of stainless steel, duralumin, or the like that is hard and does not easily deform, and does not rust. Even if these metals are not used, rustproof metal is preferable. Particularly, the metal thickness of the connecting member 1 is 2 to 5 from the viewpoint of rigidity and deformation resistance due to tensile force applied from the geotextile.
mm is suitable, and more preferably a thickness of around 3 mm is desirable. Further, the external dimensions of the connecting member 1 are arbitrary sizes corresponding to the concrete block 3 of the glue frame. As a position where the connecting member 1 is sandwiched between the glue frame concrete blocks 3, by sandwiching and locking it at the boundary between the adjacent glue frame concrete blocks 3, there is also an effect that the glue frame can be installed linearly. The U-shaped wedge 4 preferably has a width of about 10 cm and a foot length of about 15 to 20 cm.

FIG. 4 schematically shows the shape of the connecting portion of the connecting member, and 5 to 8 are four kinds of specific examples.
FIG. 5 is a geotextile fixing part b of the connecting member of FIG.
3 is a schematic view of the fixing surface of the other fixing portion, and has a pin-shaped projection 10, a shape with a large number of projections (male fastener) 11, a shape of the fixing surface with a hook-shaped projection 12 (structure)
Are shown respectively.

[0017]

EXAMPLES The present invention will be further described below with reference to examples.

Example 1 Embankment height 10 m, glue surface 1: 0.8, embankment layer 2 layers,
High embankment work on steep slopes using cohesive soil as embankment material
The embankment was carried out by a method of embankment using a paste frame. That is, the embankment material was cohesive soil, and in order to drain the rainfall seepage water and the spring water from the ground to the outside of the embankment body, a reinforced embankment work was carried out by laying geotextile non-woven fabric as a horizontal drainage material.

The embankment was constructed by rolling compaction every 30 cm of soil cover thickness from the lower tier along the design gradient. Here, the non-woven fabric was laid on the entire surface at a pitch of 60 cm in the height direction of the embankment, and was laid on the paste side with a 2-3% downward slope.

As the concrete glue frame, a hollow rectangular frame as shown in FIG. 2 was used in consideration of drainage of excess pore water in the embankment from the glue surface and vegetation of the glue surface. At this time, in order to bring the glue frame into close contact with the embankment surface, the geotextile and the glue frame were connected using a glue frame connecting member as shown in FIG. 3, and the glue frame was brought into close contact with the embankment surface.

Using such a connecting member, the glue frame was arranged in a straight line in accordance with the progress of raising according to the design gradient, and a horizontal drainage material (nonwoven fabric) of geotextile was laid every 60 cm from the lower stage. As the non-woven fabric, a polyester spun bond having a basis weight of 300 g / m ² and a thickness of 3 mm was used.

As the connecting member of FIG. 3, a U-shaped connecting member made of corrosion-resistant metal was used. The connecting members were arranged in a horizontal row and sandwiched on the boundary of the concrete glue frame. Next, the geotextile was overlapped on the mesh-shaped grid-like fixing portion b of the connecting member, and several U-shaped wedges 4 were driven from above to fix the connecting member and the geotextile. Next, the geotextile sheet was tensioned and spread in the depth direction of the embankment. This method was sequentially repeated every 60 cm pitch in the height direction of the embankment to complete the reinforcement embankment work.

As a result, according to the method using the connecting member of the embodiment, the construction method is extremely simple, and the time required for construction is ⅕ of that of the conventional method, which is extremely short.

[0024]

According to the connecting member of the present invention, the following effects are realized.

(1) In steep and high embankment work, a reinforced embankment method of laying geotextiles in multiple layers in the horizontal direction has been used in recent years, and on the other hand, there is a method of laying a frame on the slope to protect the slope. However, as a means to easily connect this geotextile and glue frame at the construction site,
The invention of the connecting member has a great economic effect.

(2) The connecting member also has the effect of performing a linear construction of the glue frame by sandwiching and locking it at the boundary between adjacent glue frame concrete blocks.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a construction structure in which the end portion of the geotextile is connected and locked to a concrete block of the glue frame by the glue frame connecting member of the present invention.

FIG. 2 is a perspective view of a concrete block which is an example of a glue frame.

FIG. 3 shows a glue frame connecting member of the present invention and a U-shaped wedge that is driven in to fix the geotextile to the connecting member.

FIG. 4 is a schematic view showing an example of the shape (structure) of the connecting portion of the glue frame connecting member.

FIG. 5 is a schematic view showing an example of the shape (structure) of the fixing surface of the geotextile fixing portion of the glue frame connecting member.

[Explanation of symbols]

1: Glue frame connection member (member having a U-shaped connection part) 2: Geotextile 3: Glue frame (hollow rectangular concrete block) 4: U-shaped wedge a: Hinge part b: Geotextile fixing part (lattice) 5: U-shaped (groove) connection part 6: H-shaped (groove) connection part 7: L-shaped (hooking) connection part 8: T-shaped (hooking) connection part 9: Lattice shape Fixed surface 10: Pin-shaped projection fixed surface 11: Surface having a large number of projections (male fastener) 12: Projected hook-shaped fixed surface

Claims (8)

[Claims] 1. A connecting member for connecting a geotextile to a paste frame in a reinforced embankment method, the connecting member comprising a paste frame connecting portion and a geotextile fixing portion, the paste frame connecting portion being provided on the paste frame. A glue frame connecting member having a groove or a hook that is a fitting structure, and the geotextile fixing portion has a lattice-shaped or pin-shaped projection on the surface of the fixing portion. 2. The glue frame connecting member, wherein the geotextile fixing portion has a combined structure of a wedge-shaped jig and the jig fixing portion. 3. The structure of the glue frame connecting portion is U-shaped, H
The glue frame connecting member according to claim 1 or 2, which has a structure selected from a character shape, an L shape, a T shape, or a combination thereof. 4. A combined structure comprising the wedge-shaped jig and the jig fixing portion is attached to the glue frame connecting portion, and the wedge-shaped jig is the jig fixing portion surface. 3. The glue frame connecting member according to claim 2, wherein the glue frame connecting member is engaged in a state in which it is pushed in via a geotextile. 5. The glue frame connecting member according to claim 1, wherein the material forming the connecting member is made of a corrosion-resistant metal or a rust-proof metal. 6. The glue frame is made of at least one selected from concrete, resin, and metal.
Or the glue frame connecting member according to 2. 7. In the reinforced embankment method, a step of installing a paste frame, a step of embankment in the paste frame, a step of attaching a paste frame connecting portion of the paste frame connecting member to the paste frame, and then a geotextile of the connecting member. Reinforced embankment method characterized in that four steps of engaging a geotextile on the surface of a fixed part are defined as one unit process and the process is repeated one or more units to form a reinforcement embankment. 8. The reinforced embankment method according to claim 7, wherein a position where the glue frame connecting portion of the glue frame connecting member is attached to the glue frame is either an upper end portion or a lower end portion of the glue frame.