JPH01190824A - Earth work method for reinforcing slope by reinforcing member of belt form - Google Patents

Abstract

PURPOSE:To improve reinforcing effect by inserting a casing which contains a reinforcing member of a belt form with highly pressurized fluid discharged into a bed rock, pulling up the casing, and thereby anchoring the base end of the reinforcing member onto the slope of the bed rock. CONSTITUTION:The base end of a casing 12 is driven by a hammer 11, and concurrently the hammer 11 is advanced along a guide cell 10 with highly pressurized water W injected out of the nozzles at the tip end of the casing 12 so as to be inserted into the specified depth while cutting a bed rock. Then, a detachable pin 15 is pulled out, the hammer 11 is retreated along the guide cell 10 so that a reinforcing member 1 in a belt form and a tip end shoe 13 are left in the bed rock. And then, the base end of the reinforcing member 1 is anchored onto the slope of the bed rock.

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, in the case of reinforcement of the embankment body and in the case of natural ground (
It can also be divided into cases of reinforcing cut slopes (hereinafter referred to as natural ground unless otherwise specified).

A typical example of the former method of reinforcing embankments is the Terre Armé method, in which steel bars or steel 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 two methods: one in which reinforcing bars are inserted in parallel, and one in which reticulated reinforcing bars are inserted in a non-parallel manner. For both, after drilling into the ground, reinforcing bars were inserted and mortar was filled around them.
It forms the small mouth of around 0 cranes. Note that in the former case, filling with mortar may not be performed.

[Problem that the invention seeks to solve]

However, in the conventional earthwork reinforcement method for natural ground, reinforcement is achieved by using reinforcing bars or edge bars containing reinforcing bars to act as resistors against bending moments and shearing. Therefore, for this purpose, it is necessary to install a large number of reinforcing materials in the natural ground, and therefore, a great deal of effort is required as a whole for post-processing such as inserting the reinforcing materials and injecting and fixing the grout.

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 functions as a bending and shearing resistor, and therefore does 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.

[Failure to solve the problem]

The present invention aims to solve the above-mentioned problems by inserting a band-shaped reinforcing material with a thickness of 0.6 to 2 Qmm into a hollow flat casing, and discharging 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 liquid 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

[For production]

In the present invention, in order to insert and install the belt-shaped reinforcing material into the ground,
Since the surface area per material is large, the tensile resistance when the ground tries to collapse is extremely large, and the reinforcing effect of the ground is large. On the other hand, since the reinforcing effect is large, it is sufficient to insert and install a small number of reinforcing strips, and the number of construction steps is reduced overall.

On the other hand, it is absolutely impossible to install the thick strip-shaped reinforcing material of the present invention with a thickness of 0.6 to 201 m by press-fitting or hammering, but it is impossible to install it by press-fitting or hammering. The reinforcing material can be easily inserted into the ground by inserting it by the drilling action of the casing, and then pulling out only the casing and leaving the strip reinforcing material in the ground.

That is, in cases where the perforating action by discharging high-pressure liquid alone is insufficient as a perforating force or when the ground tends to collapse, it is necessary to forcibly apply forward force to 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, the piercing force of the high-pressure liquid is added in conjunction with the pressing and impacting forces, so that the casing and the reinforcing strip can be inserted 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 O16~
20 cranes, particularly preferably 1 to 1011, are used, and the width W is 501 square or more, especially 100 mm or more, and the upper limit is 300**, and in some cases 1100 (
Up to b. 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 the insertion installation example described later, the strip-shaped reinforcing material 1 is cut out from the slope of the natural ground 2 as shown in Fig. 1 to find the expected slip line! Insert and install deeper.

When constructing a pseudo-retaining wall, it is not necessary to reach β.

After this insertion and installation is completed, the protective wall 3 is formed on the slope by spraying mortar or the like, and the base end of the band-shaped reinforcing material 1 is fixed to the slope.

Various fixing means can be used as this fixing means, but for example, as shown in FIG. 4, the base end of the reinforcing material 10 is bent,
As shown in FIG. 5, it can be folded back to integrate with the protection wall 3, or as shown in FIG. can.

On the other hand, the reinforcing material 1 may be inserted diagonally, but it is usually preferable to insert it horizontally. Examples of the arrangement include a staggered arrangement as shown in FIG. 3, as well as a layered arrangement in the height direction. 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 material is 0.5
m to 2 m is preferable, and the height interval is 0.5 to 3 m.
is preferred.

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 to also use press-fitting and/or impact force. In this case, since the thickness of the reinforcing material 1 is thin and there is no yield strength at the time of insertion,
It is preferable to press fit 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 ground, and an air or hydraulic hammer 11 such as a Buehler type or Krutsub type that moves forward and backward in the long plane direction is installed on the guide cell 10. 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
The proximal end of the hammer 110 is detachably connected to the base end of the hammer 110 via a connecting bracket 14.

On the other hand, the pressure feed pipes 18, 18 are fixed to the casing 12, for example, on both sides of the storage hole 12'a, by welding or by a holding seat 19, and the connecting parts 18a, 18a at the base are fixed to the casing 12.
It is led out and connected to a pressure supply source for high pressure liquid, such as high pressure water W. Furthermore, a jet nozzle 2121 is attached to the tip of the connecting pipe 18.18 via a couple 20.2.0.

These jet nozzles 21. ．． 21 is made to protrude forward from the tip of the casing 12, and is inserted into the through hole 13c of the tip shoe 13.
, insert it at 1'3c.

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, and the reinforcing material 1 is connected to the casing 12 by a detachable pin 15 at the base of the reinforcing material 1, and the casing 12 is connected to the tip shoe. 1
3. Apply hammer force to the base end of the casing 12 with the hammer 11 while fitting the reinforcing member 1 into the rear recess 13a and connecting the tip of the reinforcing member 1 with the connecting pin 16 at the connecting protrusion 13b of the tip shoe 13. , the hammer 11 is advanced along the guide cell 10, and high-pressure water W is ejected from the ejection nozzles 21 and 21 to cut the ground and insert it to a predetermined depth.

Thereafter, the detachable pin 15 is pulled out, the hammer 11 is moved back along the guide cell 10, and the casing 12, the jet nozzle 21.21, and the connecting pipe 18.18 are pulled out, leaving the reinforcing material 1 and the tip shoe 13 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, reinforcing material 1, and tip shoe 13 are completed, 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 work 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 caused by the drawing. Also,
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 proximal end is thicker than the thickness of the reinforcing material l. When the tip shoe 13 is used, as shown in Fig. 16, it acts as a resistor for the strip reinforcement material 1 when the ground is about to collapse, and together with the injection effect of the grout G, it provides strong tensile resistance. You can compose your body.

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 plates, nets, punched metal, or other metal plates. 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 50 kg/cm2 or more, especially 200 k
g/cm2 or more is preferable. 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 project it.

〔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 construction method of the present invention, Figure 2 is a perspective view of the band-shaped reinforcement, Figure 3 is a side view of its arrangement, and Figures 4 to 6.
The figure is a fixation side view of the reinforcing material head, FIG. 7 is a perspective view of an example of the reinforcing material insertion device, FIG. 8 is a perspective view of only the casing in a pulled out state, and FIG. 9 is a state of connection between the tip shoe and the strip-shaped reinforcing material. Figure, 1st
Figure 0 is a front view of the tip shoe, Figure 11 is a horizontal cross-sectional view of the tip shoe and the tip of the casing, Figure 12 is a side view thereof, Figure 13 is a front view of the casing, and Figure 14 is a horizontal cross-section thereof. 15 is a horizontal sectional view of another example of the tip shoe, and FIG. 16 is a schematic diagram of a state in which a reinforcing strip is inserted into the ground and grout is injected. ■... Band reinforcement material, 2... Earth, 3... Protection wall,
6... Reinforcing bar, 10... Guide cell, 11... Hammer, 12... Casing, 13... Tip shoe,
17... Injection pipe, 1st... Spray nozzle, G... Grout, W... High pressure water.

Claims (1)

[Claims] (1) Thickness of 0.6 to 20 mm inside the hollow flat casing
Insert the strip-shaped reinforcing material of mm in diameter, and while discharging high-pressure liquid from inside the casing or from the front position of the tip of the casing, insert the casing containing the strip-shaped reinforcing material into the ground to a predetermined depth while perforating the hole by the perforating action of the discharge of the high-pressure liquid. death,
A slope reinforcement earthwork method using a band-shaped reinforcing material, which is characterized in that the casing is then pulled out, the band-shaped reinforcing material is left in the ground, and the base end of the band-shaped reinforcing material is fixed on the slope.