JPH0460165B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a slope-reinforcing earthwork method in which a band-shaped reinforcing material is inserted and installed from a natural mountain slope, a cut slope, or an embankment slope to stabilize the slope.

[Conventional technology]

Reinforced earthwork methods are aimed at stabilizing slopes and increasing their bearing capacity. In this case, it can be roughly divided into cases of reinforcing the embankment body and cases of reinforcing the natural ground (sometimes a cut slope, hereinafter referred to as natural ground unless otherwise specified).

Typical examples of the former type of embankment reinforcement are:
This is the Terre Alme construction method, in which steel bars and plates are installed horizontally at each level of embankment. In addition, when reinforcing the embankment, there are cases where only reinforcement materials such as net materials are used, and cases where a retaining wall is provided as in the Terre Alme construction method.

On the other hand, as for natural ground, there are only a construction method in which reinforcing bars are inserted in parallel, and a construction method in which steel reinforcing bars are inserted so as not to be parallel to each other. Both methods involve drilling into the ground, inserting reinforcing bars, and filling the surrounding area with mortar to form small-diameter piles of approximately 100 mm. Note that in the former case, filling with mortar may not be performed.

[Problem that the invention seeks to solve]

However, conventional earthwork methods for reinforcing natural ground use reinforcing bars or small-diameter piles containing reinforcing bars to act as resistors against bending moments and shearing, thereby achieving reinforcement. Therefore, in view of the purpose, it is necessary to install a large number of reinforcing materials in the natural ground, which requires a great deal of effort as a whole for inserting the reinforcing materials and post-processing such as grouting and fixing.

In addition, the present inventors have discovered that in many cases it is effective to use reinforcing materials as tensile resistors to prevent the collapse of natural lands; however, in the conventional construction methods described above, reinforcing materials are It acted as a bending and shearing resistor, and therefore did not have a sufficient reinforcing effect.

Therefore, the main object of the present invention is to provide a reinforced earth construction method that has a large reinforcing effect on natural ground and has high construction efficiency.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention inserts a band-shaped reinforcing material with a thickness of 0.6 to 20 mm into a hollow flat casing, and discharges high-pressure liquid from inside the casing or from a position in front of the casing tip. The casing that accommodates the reinforcing strip is inserted into the ground to a predetermined depth while perforating by the perforating action of the discharge, and then the casing is pulled out, the reinforcing strip remains in the ground, and the base end of the reinforcing strip is placed on the slope. It is characterized by being established in

[Effect]

In the present invention, since the strip-shaped reinforcing material is inserted into the ground, the surface area per material is large.
The tensile resistance when the ground tries to collapse is extremely high, and the reinforcing effect of the ground is large. On the contrary, since the reinforcing effect is large, only a small number of reinforcing strip insertion devices are required, and the number of construction steps is reduced overall.

On the other hand, it is impossible to install the thick strip-shaped reinforcing material of the present invention with a thickness of 0.6 to 20 mm by press-fitting or hammering, but it is impossible to install it by press-fitting or hammering, but it is impossible to install it by press-fitting or hammering. If the reinforcing material is inserted by action, and then only the casing is pulled out, leaving the band-shaped reinforcing material in the ground, it can be easily inserted and installed in the ground.

That is, in cases where the perforating action by the discharge of high-pressure liquid is insufficient as a perforating force or the ground tends to collapse, it is necessary to forcibly apply forward force using the belt-shaped reinforcing material. In this case, it is necessary to apply pressure or impact force to the reinforcing strip, but as described above, thin reinforcing strips do not have sufficient strength and deformation resistance. On the other hand, according to the present invention, by wrapping the thin reinforcing material in a casing and applying pressure or impact force to the casing, the reinforcing material can be inserted into the ground while preventing deformation of the reinforcing material. Moreover, in this case, since the piercing force of the high-pressure liquid is added in conjunction with the pressing and impacting force, it becomes possible to insert the casing and the belt-shaped reinforcing material without being affected by the ground.

〔Example〕

The present invention will be explained in more detail below with reference to the drawings.

In the present invention, as shown in FIG. 2, a strip-shaped reinforcing material made of a steel plate or the like is used. In this case, the thickness t is 0.6 to 20 mm, particularly preferably 1 to 10 mm, and the width W is 50 mm or more, especially 100 mm or more, with an upper limit of 300 mm, depending on the case.
It is said to be up to 100mm. Various lengths can be used as the length L, but the longest length is about 10 m due to the ease of construction and restrictions on installation equipment due to the construction being carried out on a slope.

Now, according to an example of insertion and installation described later, such a strip-shaped reinforcing material 1 is inserted and installed from the slope of the cut natural ground 2 to a depth deeper than the expected slip line l, as shown in FIG. When constructing a pseudo-retaining wall, it is not necessary to reach l. When this insertion device is completed, a protective wall 3 is formed on the slope by spraying mortar or the like, and the base end of the reinforcing strip 1 is fixed to the slope.

Various fixing means can be adopted as this fixing means, but for example, as shown in FIG. 4, the reinforcing material 1 and the base end are bent, or as shown in FIG. 5, it is folded back and integrated with the protective wall 3. Fixation can be carried out by providing a fixing plate 4 on the protective wall 3 and driving a wedge 5 in the direction in which it is intended to be fixed or as shown in FIG.

On the other hand, the reinforcing material 1 may be inserted diagonally, but it is usually preferable to insert it horizontally. The arrangement example is the 3rd
In addition to the staggered arrangement as shown in the figure, a layered arrangement in the height direction may be used. Furthermore, if necessary, the conventional method of inserting reinforcing bars 6 with a circular cross section may be used in combination. The horizontal spacing P of the reinforcing materials is preferably 0.5 m to 2 m, and the height spacing D is preferably 0.5 m to 3 m.

On the other hand, when inserting and installing the reinforcing material, it is preferable to use a method that utilizes the perforation effect produced by the discharge of high-pressure liquid, and also to use a combination of press-fitting and/or impact force. In this case, since the thickness of the reinforcing material 1 is small and there is no proof strength during insertion, it is preferable to apply pressure using a casing as shown in FIGS. 7 to 15.

To explain this, a guide cell 10 is fixed to a scaffold (not shown) or the like outside the slope of the earth, and an air or hydraulic hammer 11 such as a Bühler type or a Krupp type is installed on the guide cell 10, which advances and retreats in the longitudinal direction. I'll keep it. Further, the reinforcing strip 1 is inserted into a flat rectangular casing 12 having a storage hole 12a, and a wide chevron-shaped tip shoe 13 is placed at the tip of the casing 12. Furthermore, casing 1
2 and the hammer 11 rod are removably connected via a connecting bracket 14.

On the other hand, the casing 12 has, for example, a storage hole 12.
Weld the pressure feed pipes 18, 18 to both ends of a and attach the holding seat 1.
9, and connecting portions 18a, 18 at the base thereof.
a is led out of the casing 12 and connected to a pressure supply source of high pressure liquid, such as high pressure water W. Also,
At the tips of the connecting pipes 18, 18, couplings 20, 2 are provided.
The ejection nozzles 21, 21 are attached via 0. These jet nozzles 21, 21 are made to protrude forward from the tip of the casing 12, and
are inserted into the through holes 13c, 13c.

The reinforcing material 1 is inserted into the casing 12 in advance using a punching and inserting machine using high-pressure water that involves press-fitting and impact.
It is inserted into the reinforcing member 1 and connected to the casing 12 by a detachable pin 15 at the base of the reinforcing member 1. The casing 12 has a tip shoe 13 and a rear recess 13
a, and further, with the tip of the reinforcing member 1 connected by the connecting pin 16 at the connecting protrusion 13b of the tip shoe 13, applying a hammer force to the base of the casing 12 with the hammer 11,
The hammer 11 is advanced along the guide cell 10, and high-pressure water W is ejected from the ejection nozzles 21, 21 to insert the hammer 11 to a predetermined depth while cutting the ground. After that, remove the detachable pin 15 and hammer 11.
are retreated along the guide cell 10, and the casing 12, the jet nozzles 21, 21 and the connecting pipe 18,
18, reinforcing material 1 and tip shoe 13
is left in the ground.

Injecting grout into the insertion hole of the reinforcing material 1 increases adhesion to the ground, so in the embodiment, the injection pipe 17 is connected to the inside of the casing 12.

According to this embodiment, after the insertion and installation of the casing 12, the reinforcing material 1, and the tip shoe 13 are completed, the grout G is supplied from outside the slope to the injection tube 17, guided into the storage hole 12a, and injected from the tip opening thereof. This injection operation is preferably carried out during the process of drawing out the casing 12, but it may also be carried out in a state where the casing 12, which is about to be drawn out, is facing the hole created by the drawing. Alternatively, the grout G may be injected by inserting a separate injection hose into the hole from which the casing is pulled out, without attaching an injection pipe to the casing 12.

In the above example, insertion is possible even if the tip shoe 13 is not used and the tip of the casing is left blind or tapered, but as in the example, the width of the base end is thicker than the thickness of the reinforcing material 1. Tip show 13
When used, as shown in Fig. 16, it acts as a low antibody for the band-shaped reinforcing material 1 when the ground is about to collapse, and together with the injection effect of grout G,
A strong tensile resistor can be constructed.

In addition to steel plates, the belt-shaped reinforcing material in the present invention may include other metal plates, striped metal plates with irregularities formed on the surface to increase adhesion, synthetic resin bodies, steel bodies, punched metal, or any of the above. Composite plates with surface treatments such as plating to improve corrosion resistance can be used.

As the high-pressure liquid in the present invention, various liquids other than water can be used, and particles such as abrasive grains may be mixed into the liquid to increase the drilling power.
The ejection pressure is preferably 50 Kg/cm ² or more, particularly 200 Kg/cm ² or more. The form of the ejection nozzle 21 may be that shown in FIG. 15.

In the above example, since the tip shoe 13 is used, the ejection nozzle 21 is positioned forward of the tip of the casing 12, but if the tip shoe 13 is not used, it is not necessary to make it protrude.

〔Effect of the invention〕

As described above, according to the present invention, advantages such as a high reinforcing effect on natural ground and excellent construction efficiency are brought about.

[Brief explanation of the drawing]

Figure 1 is an overall view of the implementation state of the method of the present invention, Figure 2
The figure is a perspective view of a band-shaped reinforcing material, FIG. 3 is an example of its arrangement, FIGS. 4 to 6 are examples of fixing the head of the reinforcing material, and FIG. Figure 8 is a perspective view of the casing only when it is pulled out, Figure 9 is a diagram of how the tip shoe and the reinforcing strip are connected, Figure 10 is a front view of the tip shoe, and Figure 11 is a horizontal cross section of the tip shoe and the tip of the casing. Fig. 12 is a side view of the casing, Fig. 13 is a front view of the casing, and Fig. 14 is a side view of the casing.
15 is a horizontal sectional view of another tip shoe example, and FIG. 16 is a schematic diagram of a state in which a reinforcing strip is inserted into the ground and grout is injected. 1... Strip reinforcement material, 2... Earth, 3... Protection wall, 6... Rebar, 10... Guide cell, 11...
Hammer, 12...Casing, 13...Tip shoe, 17...Injection pipe, 18...Ejection nozzle, G
...Grout, W...High pressure water.

Claims (1)

[Claims] 1 The thickness is 0.6 to 20 mm inside the hollow flat casing.
Insert a band-shaped reinforcing material of mm in size, and while high-pressure liquid is discharged from inside the casing or from the front position of the casing tip, the casing that accommodates the band-shaped reinforcing material is inserted into the ground at a predetermined depth while perforating the hole by the perforating action caused by the discharge of the high-pressure liquid. A slope reinforcement earthwork method using a belt-shaped reinforcing material, which is characterized by inserting the reinforcing material into the ground up to the casing, then pulling out the casing, leaving the reinforcing strip in the ground, and fixing the base end of the reinforcing material on the slope.