JP2000282476A - Slant surface stabilizing work and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent generation of remaining water between a stabilizing layer formed on a slant surface and a substrate by forming the layer to have a water penetration characteristic by a method of blowing a material composed of aggregate material having a specified grain size coated with a self hardening adhesive to a work execution surface through a nozzle. SOLUTION: Aggregate materials 2 are quantitatively fed to a hopper 7 continuously through a measuring unit 5 from a hopper 3, and pressure fed to a mixer 11 by the air from a compresser. Then, a self hardening type adhesive 14 prepared by the hopper 9 and a grout mixer 8 is presssure fed to the mixer 11 by a grout pump 19, the air of the compresser 12 is fed to the mixer 11, and materials A composed of the aggregate materials coated with the adhesive 14 are sprayed or blown to a work execution surface from a nozzle 18. The aggregate materials are composed of screened sand whose grain size is 5-15 mm, and in the case of applying green plants on the work execution surface, those of screened crushed stones, screened sand and gravels or artificial lightweight rough aggregate materials are used. The adhesive 14 is formed of cement paste into which reinforceing materials or mixing materials are mixed properly. Accordingly, the purpose is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a slope of an expressway constructed by an open cut method, a flooded slope of a dam, a sloped slope facing various facilities, or a steep slope having a possibility of collapse. The present invention relates to a slope stabilization method and its device.

[0002]

2. Description of the Related Art If a slope is left as it is, there is a possibility that topsoil or the like may be washed away by running water such as rainwater or collapse, so a construction method for stabilizing the slope is required.

As a conventional slope stabilization method, a stabilizer is applied or sprayed on a slope.

[0004] As the stabilizer, for example, mortar or cement milk is used.

[0005]

In the slope stabilization method using mortar or cement milk as described above, since the surface of the stabilizer layer does not have water permeability, the surface of the stabilizer layer bleeds between the base (ground surface) and the stabilizer layer. The remaining water causes lifting of the stabilizer layer (release to the base).

For this reason, there was a problem that the stabilizer layer collapsed.

In particular, since there is no outflow of oozed water, the enclosed water repeatedly expands and contracts due to the temperature difference between day and night, and cracks occur in the surface layer.

[0008] In this case, there are problems that it causes collapse and that the durability of the surface layer is significantly reduced.

It is an object of the present invention to provide a slope stabilization method and an apparatus for stabilizing a layer of a stabilizer by imparting water permeability to avoid the occurrence of various adverse effects.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a method of bonding an aggregate having a particle size necessary for obtaining water permeability to a construction surface such as a slope or a steep slope and a self-hardening adhesive. A slope stabilization method characterized by spraying a mixed spray material is adopted.

In addition, if the aggregate has a coarser inner layer grain size than the inner layer grain size, or if the aggregate requires various strengths and clogging prevention, sieving sand having a grain size of 1 to 5 mm is used. When used or when the aggregate is vegetated, the particle size is 5 to 1
Use of 5 mm squeezed crushed stone, sewed gravel or artificial lightweight coarse aggregate, and use of cement paste as the standard cement cement, and if necessary, add appropriate reinforcing material if more strength is required. In some cases, a hardening adhesive is mixed with an admixture to reduce bleeding during curing and prevent cracking.

[0012] Further, a spraying machine for receiving the supply of the aggregate, a first passage provided to supply the aggregate from the spraying machine,
A grout mixer for receiving the adhesive, a second passage provided to supply the adhesive from the grout mixer via a pump, a supply aggregate from the first passage, and a second passage.
A mixing device provided to mix the adhesive supplied from the passage, a third passage for air supply connected to a terminal of the second passage, and a spray material of the mixed aggregate and the adhesive of the mixing device; And a spray stabilizing device including a spray nozzle provided at the end of the fourth passage.

[0013] The mixing device further comprises a first and second passages connected at one end and a fourth passage connected to the other end, and a cylindrical body closed at both ends, from one end to the other end of the inner peripheral surface of the cylindrical body. It may be composed of discontinuous spiral blades provided.

Further, a mixer provided to knead appropriate amounts of supply aggregate, cement and water, a spraying machine provided to receive the kneading and mixing spraying material of the mixer, and a mixer connected to the spraying machine. In some cases, reinforcing short fibers may be mixed into the above-mentioned mixer or the above-mentioned mixer.

[0015]

Embodiments of the present invention will be described with reference to the accompanying drawings.

In the first embodiment of the present invention, as shown in FIGS. 1 to 3, the spraying machine 1 includes an aggregate 2 having a predetermined particle size.
Is supplied.

The supply of the aggregate 2 is carried, for example, from a hopper 3 by a first belt conveyor 4 as shown in FIG. 1, and then from the first belt conveyor 4 to a measuring device 5.
So that the aggregated material 2 after weighing is received and transported by the second belt conveyor 6, flows down from the second belt conveyor 6 to the hopper 7 of the spraying machine 1, and is continuously supplied. However, the aggregate 2 may be supplied to the spraying machine 1 by means other than the above.

Reference numeral 8 denotes a grout mixer, and a hopper 9 of the grout mixer 8 is supplied with a material of a self-hardening adhesive 14.

The aggregate 2 of the spraying machine 1 is fed to the mixing device 11 through a first passage 10 (made of a hose or a pipe) connected to the spraying machine 1.

For the above-described pressure feeding, air supplied from the compressor 12 to the spraying machine 1 through the passage 13 formed of a hose or a pipe is used.

The self-hardening adhesive 1 of the grout mixer 8
4 is the second passage 15 by the operation of the grout pump 19.
It is supplied (pressurized) to the mixing device 11 via a hose (made of a hose or a pipe).

The terminals of the first passage 10 and the second passage 15 are connected to one end of the mixing device 11, respectively, and the terminal of the second passage 15 is connected to the compressor 12 from the third passage 16 (from a hose or pipe). ) Is supplied with air.

Then, the flow of the adhesive 14 from the second passage 15 into the mixing device 11 is promoted (smooth supply is ensured), and the aggregate 2 from one end to the other end in the mixing device 11 is ensured. In addition, the mixing by the transfer is promoted with the good transfer of the adhesive 14.

Further, the other end of the mixing device 11 is
And a fourth passage 17 (consisting of a hose) of the blowing material A to which the adhesive 14 is attached is connected to the entire surface of the aggregate 2, and a nozzle 1 for spraying is connected to the end of the fourth passage 17.
8 are provided.

As the adhesive 14 to be supplied to the grout mixer 8, a cement paste composed of cement and water is used as a standard. If more strength is required, a cationic or vinyl acetate-based polymer may be used. In some cases, a reinforcing agent such as a vinyl adhesive or vinylon short fiber may be mixed (combined use), and an admixture such as a compound of calcium carbonate (cement) is used for the purpose of reducing the bleeding during the curing of the spray material A and preventing the occurrence of cracks. (A modifier that changes the hydration reaction) may be mixed (in combination).

With the above construction, the mixing device 11 is supplied with the aggregate 2 (fluid sand having a standard particle size of 1 to 5 mm) from the spraying machine 1 through the first passage 10 and the pump 19 from the grout mixer 8. Of the adhesive 1 through the second passage 15
4 are supplied, and air is press-fitted from the third passage 16.

In the mixing device 11, the aggregate 2 and the adhesive 14
Are mixed, and the adhesive 14 adheres to the entire surface of the aggregate 2.

The spraying material A from the mixing device 11 toward the fourth passage 17 (the aggregate 2 to which the adhesive 14 is attached) is sprayed from a nozzle 18 onto a construction surface B such as a slope or a steep slope as shown in FIG. The sprayed layer of the aggregate 2 bonded with the curing of the adhesive 14 has water permeability (the adhesive 1
When the aggregate 2 is adhered by 4, a non-contact portion of the surface adhesive of the aggregate 2 is formed, and this non-contact portion becomes a water passage. ) Is obtained.

Then, the water that has oozed out of the construction surface flows out to the surface of the spray layer by the imparted water permeability without being sealed on the back side of the spray layer.

In the second embodiment of the present invention, as shown in FIGS. 1 to 3, a mixing device 11 is provided with a first passage 1 at one end.
0, the second passage 15 is connected to the fourth passage 17 at the other end, and the closed cylindrical body 21 is provided at both ends thereof; and a plurality of discontinuous members provided from one end to the other end of the inner peripheral surface of the cylindrical body 21. Spiral blade 22
It consists of

Then, the aggregate 2 and the adhesive 14 from one end of the cylindrical body 21 to the other end (by pressure feeding) are mixed with the spiral blade 22.
As a result, a vortex flow occurs, and a drop or a turbulent flow phenomenon occurs at a portion separated by the discontinuity of the spiral blade 22 to generate an irregular vortex flow. Therefore, the mixing of the aggregate 2 and the adhesive 14 is promoted. Thus, the adhesive adheres to the entire surface of the aggregate 2.

In the third embodiment of the present invention, as shown in FIG. 5, the particle size of the aggregate 2 of the spray material A sprayed on the construction surface B is reduced in the inner layer, and the outer layer is coarse (particle size 5 to 5). 15mm squeezed slab, slab gravel or artificial lightweight coarse aggregate).

In the case of vegetation on the surface of the outer layer, the adhesion (entanglement) of the base material (customer's soil) in which plant seeds, fertilizers and the like are mixed is improved, and the desired water permeability is not impaired. .

In the fourth embodiment of the present invention, when it is necessary to prevent clogging which does not impair various strengths (such as compression, bending and shearing) and water permeability, the standard particle size is 1 to 5 mm.
When more strength is required, sieving sand having a particle size of 3 mm to 5 mm is used.

It is preferable that the grout pump 19 does not pulsate so as to eliminate uneven adhesion of the adhesive, that is, to prevent variation in strength. For example, the number of pistons may be increased.

In particular, it is desirable that the particle size (particle size) of the aggregate is uniform because water is imparted to the sprayed layer when the sprayed material is sprayed.

Next, examples of the blending of the aggregate and the adhesive are shown in Table 1 below.
Shown in

[0038]

[Table 1]

In the fifth embodiment of the present invention, as shown in FIG. 6, an appropriate amount of aggregate 2, cement S and water are supplied to the grout mixer 8 and kneaded.

The above-mentioned aggregate 2 is received by a belt conveyor 33 from a hopper 32, is put into a measuring device 34, and is weighed. From the measuring device 34, an appropriate amount of the aggregate 2 is supplied to the mixer 8.

Mixing by the mixer 8 and mixing and spraying material A
Is received by the belt conveyor 35 and supplied to the spraying machine 1 similar to the first embodiment.

The spray material A supplied to the spray machine 1 is sprayed from the supply path 36 to the nozzle 37 in the same manner as in the first embodiment.

Air required for spraying is supplied to the spraying machine 1 from the compressor 12 through the hose 38.

Table 2 below shows examples of the particle size of the aggregate 2, the cement S as an adhesive, and the mixing water.

[0045]

[Table 2]

In addition, an appropriate amount of natural or synthetic short fibers R may be mixed into the mixer 8 together with the cement S for reinforcement. Then, it is significantly reinforced by the mixed short fibers, and the strength and durability increase.

The particle size of the aggregate 2 is the same as in the first embodiment, and the description is omitted.

[0048]

According to the slope stabilization method of the present invention, a spray layer can be applied to a slope, a flooded slope of a dam, an inclined slope facing various facilities, or a construction surface such as a steep slope which may collapse. Since water permeability can be obtained, water that seeps out of the construction surface is not trapped behind the spray layer.

Therefore, there are excellent effects such as prevention of collapse of the sprayed layer and enhancement of safety.

Further, since the inner-layer-side aggregate has a finer particle size, the outer-layer-side aggregate has a coarser particle size, so that vegetation can be performed while ensuring water permeability, and the vegetation can be reliably supported (rooted). it can.

Further, according to the slope stabilizing device of the present invention, it becomes possible to favorably adhere the adhesive to the aggregate.

Further, the strength is remarkably reinforced by the mixed short fibers, and the durability is improved as the strength is increased.

Further, the water permeability can be changed by changing the particle size, and the nozzle direction can be changed to horizontal or horizontal.
The loss due to the rebound of the spraying material can be reduced by facing upward.

[Brief description of the drawings]

FIG. 1 is a side view showing a slope stabilizer according to the present invention.

FIG. 2 is a longitudinal side view of a mixing device.

FIG. 3 is a vertical sectional front view of the above.

FIG. 4 is a cross-sectional plan view showing a sprayed material sprayed on a construction surface.

FIG. 5 is a cross-sectional plan view showing another construction of the spray material.

FIG. 6 is a side view showing another slope stabilizer.

[Description of Signs] A Spraying Material B Construction Surface 1 Spraying Machine 2 Aggregate 3, 7, 9 Hopper 4 First Belt Conveyor 5 Meter 6 Second Belt Conveyor 8 Grout Mixer 10 First Passage 11 Mixing Device 12 Compressor 13 Passage 14 adhesive 15 second passage 16 third passage 17 fourth passage 18, 37 nozzle 19 grout pump 21 cylindrical body 22 spiral blade 31 pipe 32 hopper 33, 35 belt conveyor 34 measuring device 36 supply path S cement R short fiber

Claims (10)

[Claims] 1. A slope stabilization method characterized by spraying a sprayed mixture of an aggregate having a particle size necessary for obtaining water permeability and a self-hardening adhesive on a slope or a construction surface such as a steep slope. 2. The slope stabilizing method according to claim 1, wherein the aggregate has a coarser outer layer grain size than a smaller inner layer grain size. 3. The slope stabilizing method according to claim 1, wherein when the aggregate requires various strengths and prevention of clogging, sieve sand having a particle size of 1 to 5 mm is used. 4. The method according to claim 1, wherein the aggregate has a particle size of 5 when vegetation is applied.
The slope stabilization method according to claim 1, wherein a crushed slab, a slab of gravel, or an artificial lightweight coarse aggregate having a size of about 15 mm is used. 5. The slope stabilizing method according to claim 1, wherein the self-hardening adhesive uses a cement paste as a standard and incorporates an appropriate reinforcing material when more strength is required. 6. The slope stabilizing method according to claim 1, wherein an admixture is added to the self-hardening adhesive to reduce bleeding during curing and prevent the occurrence of cracks. 7. A spraying machine receiving an aggregate, a first passage provided to supply the aggregate from the spraying machine, a grout mixer receiving an adhesive, and a pump from the grout mixer via a pump. A second passage provided to supply the adhesive; a mixing device provided to mix the supply aggregate from the first passage and the supply adhesive from the second passage; and a terminal of the second passage. A third passage for connected air supply;
A slope stabilizing device comprising a fourth passage for supplying a spray of mixed aggregate and an adhesive of the mixing device, and a spray nozzle provided at an end of the fourth passage. 8. The apparatus according to claim 1, wherein the mixing device has first and second ends at one end.
The passage is constituted by a tubular body having both ends closed to each other and a fourth passage connected to the other end, and a discontinuous spiral blade provided from one end to the other end of the inner peripheral surface of the tubular body. The slope stabilizer according to claim 7, wherein 9. A mixer provided to knead an appropriate amount of supplied aggregate, cement and water, a sprayer provided to receive a kneading and mixing spraying material of the mixer, and a sprayer connected to the sprayer. A slope stabilizing device comprising a spray material supply path having a nozzle at the tip. 10. The slope stabilizer according to claim 9, wherein reinforcing short fibers are mixed in the mixer.