JPH0288816A - Reinforcing material for soil - Google Patents

Abstract

PURPOSE:To make construction work easier by a method in which bar-like tension members thrusting through the resistant plates of pressure receivers are detachably fixed at a given interval to the resistant plates by utilizing screw grooves and buried in banking. CONSTITUTION:Bar-like tension members 12 are inserted into the holes 11a of the resistant plates 11 of pressure receivers set at a desired interval and fixed to the plates 11 at any places of screw grooves 22. One ends 12a of the members 12 are connected to each will and the other ends 12b are fixed to the plates 11 of the pressure receivers 10 by nuts 15. They are set on banking layer and buried in soil by tamping. The reinforcing effect can thus be surely achieved.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a reinforcing material for reinforced soil that is used by being buried in the embankment layer of earth retaining structures, etc., and in particular, it is used as an embankment for soft soil with low frictional force. The present invention relates to a reinforcing material for reinforced soil that can obtain a reliable reinforcing effect even when using the same method, and can arbitrarily increase or decrease its reinforcing function during construction in response to measurement results during construction such as dynamic observation.

[Conventional technology]

BACKGROUND ART When constructing earth retaining structures, a construction method is conventionally known in which a plurality of linear flexible reinforcing materials are laid in layers and soil is piled up. (Refer to Japanese Patent Publication No. 44-25174.) This construction method maintains the earth retaining structure only by the frictional force generated between the soil particles and the reinforcing material that comes into frictional contact with them. Although it is effective for sandy soils with large frictional forces, it is not suitable for soils with low frictional forces.

In order to solve this problem, as shown in FIG.
, 2 .

When constructing this reinforcing material, first, as shown in Figs. 10 and 11, support panels 2, 2...2 are installed on the embankment layer 5, soil is poured out from above, and the soil is compacted. The reinforcing material is buried in the embankment layer, but at this time, the reinforcing material is deformed by the embankment and compaction, making it impossible to hold the surface of the pressure-bearing panel 2 correctly parallel to the wall panel 4. For this reason,
Grooves 6.6...6 in the embankment layer 5 as shown in Figure 1O.
Dig the grooves 6.6...6 and install pressure-bearing panels 2.2...
- After accurately arranging and backfilling the reinforcement material 2, as shown in FIG. 11, the embankment 7 is poured out on top of it and compacted to bury the reinforcing material in the embankment layer.

However, this construction method complicates the process because a trench 6 must be dug in the embankment layer 5, and furthermore, the bearing panels 2.
2...The embankment around 2 has become loose. When the embankment is further compacted, the pressure-bearing panels 2, 2..., 2 tend to tilt back and forth or from side to side (as shown in FIG. 11). The resistance force is significantly reduced compared to the original design.The reason for this is that when the area of the bearing panel 4 is the same, when the tension member is located perpendicular to the surface of the bearing panel 4, the maximum However, as the inclination of the pressure-bearing panel 4 with respect to the tension member increases, the pullout resistance force decreases significantly.

In addition, since the buried soil is not easily compacted around the bearing panel 4 inside the groove 6, when earth pressure acts on the wall panel 4 and pull-out force acts on the reinforcing material, the bearing panel 4 As a result, the wall panel 4 is also displaced forward, resulting in an embankment structure with large deformation.

For this reason, the above-mentioned known reinforcing materials not only have extremely complicated workability, but also make it difficult to obtain a reliable reinforcing effect.

Furthermore, reinforcing materials made by combining rod-like bodies in a mesh-like manner are also known. (Special Public Interest Publication No. 59-20821
(Refer to the publication) In this reinforcing material, the vertical members of the mesh act as tension members, and the horizontal members act as pull-out resistors, making it effective even in soils with low frictional force.
In addition, during construction, it can be put into use by simply placing it on top of the embankment layer, rolling out the soil, and compacting it.

However, this reinforcing material is usually assembled into a mesh shape by welding etc. in a factory and then transported to the site.
It is time-consuming to transport, and furthermore, it is impossible to increase or decrease the pull-out resistance of the reinforcing material as required on site. In other words, it is not possible to subsequently change the design of the reinforcement function that corresponds to the soil conditions assumed in the pre-construction survey. In response to changes, the reinforcement function may be increased in response to measurement results such as dynamic observation during construction, or if it is discovered during construction that the design is over-designed, the reinforcement function may be reduced in response. etc. is not possible.

[Problem that the invention seeks to solve]

In recent years, in construction work, there has been a demand to observe the dynamics of earth structures as part of construction management during construction, and to feed back the results to carry out optimal construction, thereby improving work efficiency and increasing economic effects. However, the above-mentioned known reinforcing materials are not suitable for meeting such demands. In other words, in the past, reinforcing materials were made entirely in factories as finished products and transported to the site, where construction was carried out based on a predetermined design. This is because they did not have the technical capacity to carry out the design, and had no choice but to construct based on an over-designed design that included uncertain factors.

Therefore, the purpose of the present invention is to provide a reinforcement system that improves the shortcomings of the conventional technology by obtaining a reliable reinforcing effect even in low-quality soil, and by immediately feeding back measurement results such as dynamic observation during construction to increase or decrease the reinforcing effect. Our purpose is to provide soil reinforcement materials.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides a pressure receiving body having a horizontally elongated upright resistance plate, and a pressure receiving body that penetrates through the resistance plate of this pressure receiving body and has a desired spacing. It is characterized by comprising a plurality of rod-shaped tensile members detachably fixed to the resistance plate through openings.

Hereinafter, the present invention will be explained in detail using the accompanying drawings. FIGS. 1 and 2 are perspective views of an example of a reinforcing material according to the present invention, in which 10 is a pressure receiving body, which supports a horizontally elongated resistance plate 11. The pressure receiving body 10 is a horizontally elongated plate-like body as shown in the first diagram, and the pressure receiving body 10 itself may be a resistance plate 11, or as shown in the second diagram, an L-shaped steel or a However, T-shaped steel may also be used.The reason for this is that steel is highly elastic.
This is because it maintains its flexibility as a reinforcing material, making it easier to maintain the integration of the embankment and the reinforcing material. Also, resistance plate 1
1 is preferably a flat plate as shown in FIGS. 1 and 2, but it may also be a curved plate or the like, although not shown.

12 is a rod-shaped tensile member, as shown in the fourth figure, thread grooves 13, 13, 13, etc. are partially formed at arbitrary locations;
Alternatively, although not shown, a twisting thread groove may be formed along the entire length. As shown in FIGS. 1 and 2, a plurality of such rod-shaped tensile members 12 pass through the resistance plate 11 of the pressure receiving body lo, and are detachably fixed to the resistance plate 11 at desired intervals. This fixation is performed by inserting the rod-shaped tensile material 12 into the hole 11a of the resistance plate 11 and screwing the resistance plate II and the rod-shaped tensile material 12 at any location in the thread groove 12. It is preferable that an extra thread groove 12 be provided at a location other than the location where it contacts the hole 11a of the resistance plate 11, as shown in FIGS. 1 and 2.

The reason for this is that when it is desired to increase the number of resistance plates 11 as will be described later, the number can be easily increased using the extra threaded grooves.

Furthermore, one end 12a of the rod-shaped tensile material I2 is connected to the wall panel 14, as shown in the first figure, and
The other end 12b is connected to the resistance plate 11 of the pressure receiving body 10) 15
Fixed by The connection to the wall panel 14 is optional, such as by means of a bag napht 16 as shown in the first figure.
As shown in the second figure, an L-shaped steel 17 (same as the pressure receiving plate 10) is fixed to the back surface 14a of the wall panel 14 with bolts 18, and the end 12a of the rod-shaped tensile material IO is attached to this L-shaped w417.
You may also fix it with a Nando or the like.

Further, the reinforcing material of the present invention is applied to the wall panel 1 as shown in the second figure.
Furthermore, as shown in FIG. .14...14 may be divided into an appropriate number and connected.

When constructing the reinforcing material of the present invention constructed in this manner, first, as shown in FIG. And the end 12a of the rod-shaped tensile material 12 is connected to the wall panel 14.
Connect to. Next, as shown in Figure 6, soil is poured out from above and compacted to bury the reinforcing material of the present invention in the embankment layer 19, and then the reinforcing material of the present invention is further placed on the newly formed embankment layer 19. are placed in the same manner as described above, the soil is poured out and compacted, and this operation is repeated to construct the earth retaining structure A as shown in Figure 7. In FIG. 7, 20 is a virtual slip surface.

[Effect]

In the reinforcing material of the present invention described above, a plurality of rod-shaped tensile members 12 are fixed to the horizontally elongated upright resistance plate 11 of the pressure receiving body 10.
As shown in FIG. 8, even if force F is applied to the reinforcing material buried in the embankment layer 19, the resistance plate 11 of the pressure receiving body 10
can maintain an upright state and maintain a constant tensile resistance P, maintaining the design value. This tendency is due to the fact that the pressure receiving body 10 is a type steel (L type,
This is particularly noticeable in cases of T-type, etc.). Therefore, even if soft earth and sand with low frictional force is used as the embankment, a reliable reinforcing effect is exhibited.

Furthermore, since the reinforcing material of the present invention has a plurality of rod-shaped tensile members 12 fixed to the pressure-receiving body 10 at desired intervals, during construction, grooves are formed in the embankment layer as in the conventional method, and the pressure-receiving material is placed in the grooves. There is no need for the operation of arranging the body 10, and the pressure receiving body can be stably held simply by arranging it on the embankment layer, thus facilitating construction.

In addition, in the reinforcing material of the present invention, the rod-shaped tensile material 12 is detachably fixed to the pressure receiving body 10, and the pressure receiving body 10 can be added or removed at will, so that measurement results such as dynamic observation during construction can be immediately fed back. The reinforcement effect can be increased or decreased by increasing or decreasing the number of pressure receptors 10 at the site.

〔Effect of the invention〕

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

A description of the method as well as its shortcomings.

・Pressure receiving body, 11・ rod-shaped tensile material, ・Wall panel, ・Earth retaining structure.

・Resistance plate, 13.・Noshi groove, 19...embankment layer,

Claims (4)

[Claims] (1) A pressure receiving body having a horizontally erected resistance plate, and a plurality of rod-shaped tensile members that penetrate the resistance plate of the pressure receiving body and are detachably fixed to the resistance plate at desired intervals. Reinforcement material for reinforced soil used by being buried in the embankment layer. (2) The reinforcing material according to claim 1, wherein an end portion of the rod-shaped tensile material is connected to a wall panel. (3) The reinforcing material according to claim 1, wherein a thread groove is formed on the surface of the rod-shaped tensile material over the entire length or partially. (4) The reinforcing material according to claim 1, wherein the pressure receiving body is a shaped steel.