JPH0788664B2 - Reinforcement material for reinforced soil - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a reinforcing material for reinforced soil which is used by being embedded in an embankment layer such as an earth retaining structure, and in particular, soft earth and sand having a small frictional force as an embankment. The present invention relates to a reinforcing material for a reinforced soil which can reliably increase and decrease the reinforcing function during construction according to the measurement result during construction such as dynamic observation, even when using.

[Conventional technology]

When constructing a soil retaining structure, a method of stacking soil while laying a plurality of linear flexible reinforcing materials in layers has been known. (See Japanese Examined Patent Publication No. 44-25174). This method maintains the soil retention structure only by the frictional force generated between the soil particles and the reinforcing material that makes frictional contact with it, but this method is not suitable for sandy soil with high frictional force. Effective, but unsuitable for soil with low friction.

In order to solve such a problem, as shown in FIG. 9, a large number of square bearing panels 2, 2, ... A reinforcing material has been proposed in which the wall panel 4 is connected to the free end 3 of the material 1.

When constructing this reinforcement, first
As shown in the figure, the support panels 2, 2, ... 2 are installed on the embankment layer 5, the soil is sprinkled from the top, and the soil is rolled and embedded in the embankment layer. The reinforcing material is deformed by the pressure, and the pressure bearing panel 2 is pressed against the wall panel 4.
It is not possible to keep the surfaces of and parallel to each other correctly. Therefore, the tenth
As shown in the figure, trenches 6, 6 ... 6 are dug in the embankment layer 5, and pressure bearing panels 2, 2 ... 2 are provided in these trenches 6, 6 ... 6.
Are accurately arranged and backfilled, and as shown in FIG. 11, the embankment 7 is sprinkled onto the embankment 7 and rolled to embed the reinforcing material in the embankment layer.

However, in this method, since the groove 6 must be dug in the embankment layer 5, the process is complicated, and the bearing panel 2,
2 ... The embankment around 2 becomes loose. When the embankment is further compressed, the bearing panels 2, 2, ... 2 tend to tilt forward or backward or left and right as shown in FIG. For this reason, the pull-out resistance force against the earth pressure acting on the wall panel 4 is significantly reduced as compared with the initial design. The reason for this is that when the bearing panel 4 has the same area, the maximum pull-out resistance is obtained when the tension member is positioned perpendicular to the surface of the bearing panel 4, but the tension panel does not support This is because the pull-out resistance force is significantly reduced as the inclination of 4 is increased.

Further, since the buried soil is less likely to be compacted around the bearing panel 4 inside the groove 6, when the earth pressure acts on the wall surface panel 4 and the pulling force acts on the reinforcing material, the bearing panel 4 moves to the wall panel 4 side. The wall surface panel 4 is also displaced to the front, resulting in a highly deformed embankment structure.

For this reason, the above-mentioned known reinforcing material is not only extremely complicated in workability, but also difficult to obtain a reliable reinforcing effect.

Further, a reinforcing material is also known in which rod-shaped bodies are combined in a mesh shape. (Refer to Japanese Examined Patent Publication No. 59-20821) In this reinforcing material, the longitudinal member of the mesh acts as a tensile member and the lateral member acts as a pull-out resistor, and it is effectively used even in soil with a low frictional force, and construction At that time, it is used by simply placing it on the embankment layer, spreading the soil, and rolling it.

However, since this reinforcement is usually assembled in a mesh by welding at the factory and then carried to the site,
It takes a lot of time to carry it, and it is impossible to increase or decrease the pull-out resistance of the reinforcing material as needed on site. That is, it is not possible to change the design of the reinforcement function corresponding to the soil condition assumed by the survey before construction, for example, when the actual soil used is different from the prediction before construction, or during construction In response to changes, the reinforcement function is increased in response to measurement results such as dynamic observation during construction, or it is found during construction that the design is oversized, and the reinforcement function is reduced accordingly. It is impossible to get rid of.

[Problems to be solved by the invention]

In recent years, it has been demanded to improve workability as well as improve economic efficiency by performing dynamic observation of soil structures as construction management during construction in recent years, and feeding back the results for optimal construction. However, in order to meet such a demand, the above-mentioned known reinforcing material is not suitable. That is, in the past, the reinforcing material was completely manufactured at the factory as a finished product, carried into the site, and construction was performed on the site based on the predetermined design, and it was effective based on the measurement during the construction. This is because there was no technical ability to design and it was unavoidable to carry out construction based on an oversized design that included uncertain factors.

Therefore, an object of the present invention is to obtain a reliable reinforcing effect even in a low-quality soil, and to immediately increase or decrease the reinforcing effect by feeding back the measurement results such as dynamic observation during construction, thus improving the drawbacks existing in the prior art. It is to provide a reinforcing material for earth.

[Means for solving problems]

In order to achieve the above-mentioned object, according to the present invention, a pressure receiving body having a horizontally long standing resistance plate and a resistance plate of the pressure receiving body are pierced through the resistance plate so that the pressure plate can be detachably attached to the resistance plate at a desired interval. It is characterized by comprising a plurality of fixed rod-shaped tension members.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 and FIG. 2 are perspective views of a specific example of the reinforcing member according to the present invention, in which 10 is a pressure receiving body, which has a horizontally long standing resistance plate 11. The pressure receiving body 10 may be a horizontally long and slender plate-like body as shown in the first illustration, and the pressure receiving body 10 itself may be the resistance plate 11, and as shown in the second illustration, L
Shaped steel or a T-shaped steel, though not shown. The reason for this is that the shape steel is rich in elasticity, so that flexibility as a reinforcing material is maintained, and it is easy to keep the embankment and the reinforcing material integrated. Further, the resistance plate 11 is preferably a flat plate as shown in FIGS. 1 and 2, but although not shown, it may be a curved plate or the like. In the present invention, only one pressure receiving body 10 may be used, or a plurality of pressure receiving bodies may be used, and an arbitrary number may be selected according to the situation at the site.

Reference numeral 12 is a rod-shaped tensile member, which is formed by partially forming screw grooves 13, 13 ... 13 at arbitrary places as shown in the fourth illustration, or by forming a screw groove over the entire length although not shown. May be. As shown in FIGS. 1 and 2, a plurality of such rod-shaped tension members 12 penetrate the resistance plate 11 of the pressure receiving body 10 and are detachably fixed to the resistance plate 11 at desired intervals.
For this fixing, insert the rod-shaped tension member 12 into the hole 11a of the resistance plate 11,
It is carried out by screwing the resistance plate 11 and the rod-shaped tension member 12 at an arbitrary position of the thread groove 12. The screw groove 12 is a hole in the resistance plate 11.
In addition to the contact point with 11a, it is better to have an extra portion as shown in FIG. 1 or FIG. The reason for this is that if it is desired to increase the number of resistance plates 11 as described later, it is possible to easily increase the number by using an extra thread groove portion.

Further, one end 12a of the rod-shaped tension member 12 is connected to the wall panel 14 as shown in the first illustration, and the other end 12b is fixed to the resistance plate 11 of the pressure receiving body 10 by the nut 15. . Connection to the wall panel 14 is a cap nut as shown in the first illustration.
It is optional, for example, by means of 16 and, as shown in the second illustration, an L-shaped steel 17 (same as the pressure receiving plate 10) is fixed to the rear surface 14a of the wall panel 14 by bolts 18, and a rod-shaped tension is applied to the L-shaped steel 17. Alternatively, the end 1a of the material 10 may be fixed with a nut or the like.

In addition, the reinforcing material of the present invention has a wall panel 14 as shown in FIG.
May be connected in two layers, and further, as shown in FIG. 3, a plurality of rod-shaped tension members 12, 12 ... 12 fixed to one resistance plate 11 may be connected to a plurality of wall panels 14, 14.・ ・
・ 14 may be connected in appropriate number.

When constructing the reinforcing material of the present invention thus constructed, first, as shown in FIG.
11 is arranged horizontally and placed on the embankment layer 19 so that it stands upright,
In addition, the end 12a of the rod-shaped tension member 12 is connected to the wall panel 14. Then, as shown in FIG. 6, the soil is sprinkled from the top of the soil, the soil is rolled to embed the reinforcing material of the present invention in the embankment layer 19, and then the reinforcing material of the present invention is further formed on the newly formed embankment layer 19. Are arranged in the same manner as described above, the soil is unwound, compacted, and this operation is repeated to construct the soil retaining structure A as shown in FIG. In FIG. 7, 20 is a virtual slip surface.

[Action]

The above-mentioned reinforcing material of the present invention is embedded in the embankment layer 19 as shown in FIG. 8 because a plurality of rod-shaped tension members 12 are fixed to the horizontally elongated standing resistance plate 11 of the pressure receiving body 10. F for reinforcement
Even if the force of (1) is applied, the resistance plate 11 of the pressure receiving body 10 can maintain the upright state and maintain a constant tensile resistance force P, and the designed numerical value is maintained. This tendency is particularly remarkable when the pressure receiving body 10 is shaped steel (L type, T type, etc.). Therefore, even if soft earth and sand having a small frictional force is used as the embankment, a reliable reinforcing effect is exhibited.

Further, the reinforcing material of the present invention, since the rod-shaped tensile member 12 is fixed to the pressure receiving body 10 with a plurality of desired intervals, at the time of construction,
A groove is formed in the embankment layer as in the past, and the pressure receiver is placed in this groove.
It does not require the operation of arranging 10, the pressure receiving body is stably held simply by arranging it on the embankment layer, and therefore,
Construction becomes easy.

Further, the reinforcing material of the present invention, the rod-shaped tension member 12 is removably fixed to the pressure receiving body 10, and the measurement results such as dynamic observation during construction can be immediately fed back because the pressure receiving body 10 can be added or removed freely. The reinforcement effect can be increased or decreased by increasing or decreasing the pressure receiving body 10 at the site.

〔The invention's effect〕

As described above, the reinforcing material of the present invention obtains a reliable reinforcing effect even when using soft earth and sand with a small frictional force, and is easy to construct, and moreover during construction in response to measurement results during construction such as dynamic observation. This is a practically useful invention because the reinforcing function can be arbitrarily increased or decreased.

[Brief description of drawings]

1 and 2 are perspective views of a specific example of the reinforcing material according to the present invention, and FIG. 3 is a plan view showing an embodiment of a method of connecting the reinforcing material of the present invention to a wall panel. FIG. 4 is a perspective view of a specific example of a rod-shaped tensile member according to the present invention, and FIGS. 5, 6, and 7 show a specific example of a construction method using the reinforcing material of the present invention. FIG. 8 is a process drawing, FIG. 8 is an explanatory view showing the action of the reinforcing material of the present invention, and FIG.
FIG. 10 and FIG. 11 are explanations showing the construction method and drawbacks using the conventional reinforcing material. 10 ... Pressure receiver, 11 ... Resistance plate, 12 ... Rod-shaped tension member, 13 ... Screw groove, 14 ... Wall panel, 19 ... Embankment layer, A ... Soil retaining structure.

Claims (1)

[Claims] 1. A pressure-receiving body having a horizontally-long standing resistance plate, and a plurality of rod-shaped tension members penetrating the resistance plate of the pressure-receiving body and detachably fixed to the resistance plate at desired intervals. Reinforcing material for reinforced soil that is used by being embedded in the embankment layer consisting of.