JP2001090059A - Soil-improvement method by mixing and agitation, and its device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve trouble, in which agitation with a ground is difficult to uniformly perform because a mixed liquid is discharged in a striped shape in the excavation direction, besides trouble, in which a discharge opening is clogged in the case of excavation and must be cleaned at all times because the mixed liquid is discharged in the excavation direction from the front end of a mixing agitator in mixing and agitation by a liquefied hardening material which has been developed, regarding soft-ground improvement in a shallow stratum and a medium stratum and the foundation land-formation of a structure. SOLUTION: An object ground is excavated, ejecting or high-pressure injecting a liquefied hardening material from a liquefied hardening-material injection hole by a mixing fork 1, which has the liquefied hardening-material injection hole 21 on a side wall and in which a liquefied hardening-material ejection rod 2 curved in conformity with fork blades 11 is disposed at the central section of the fork blades, and removed soft-ground soil and the liquefied hardening material are mixed and agitated by operating the fork blades and an improved hardened stratum is land-formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for improving the ground by mixing and stirring, for mixing a liquid hardening material into a target ground and mixing and stirring to improve the leveling of soft ground and to form the foundation of a building. It is about.

[0002]

Conventionally, the improvement of soft ground in the shallow and middle layers and the foundation construction of structures have been carried out by using a general-purpose construction machine such as a backhoe while adding cement-based solidified material as powder. The method of stirring has been adopted.

[0003] However, there is a problem of dust pollution to surroundings generated by powder mixing and a problem of disposal of a used-up container bag which becomes industrial waste. And the mixture has been stirred.

[0004] However, dust is not generated in the dust-free type powder solidifying material, but requires compaction and compaction, and requires considerable skill in the mixing and stirring operation. There is a problem that the accuracy varies, and in some cases, the construction must be redone.

[0005] Further, in the mixing and stirring using the liquid hardening material developed so far, as shown in Japanese Utility Model Publication No. 5-9070, the mixture is discharged from the tip of the mixing stirrer in the excavation direction. In addition to the problem that the discharge port is sometimes clogged and the discharge port must be constantly cleaned, there is also a problem that it is difficult to uniformly mix the ground with the ground because the mixture is discharged in a streak shape in the excavation direction .

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a liquid hardening material jetting rod which has a liquid hardening material jetting hole on a side wall and is curved in synchronization with a fork blade. Using a mixing fork located in the center of the blade, excavates the target ground while squirting the liquid hardening material laterally from the liquid hardening material ejection holes, and mixes and stirs the excavated soil with the liquid hardening material by operating the fork blade Thus, an improved hardened layer is formed.

That is, by disposing a liquid hardening material ejection rod having a liquid hardening material ejection hole on the side wall at the center of the fork blade, the liquid hardening material is ejected laterally perpendicular to the excavation direction. Since the liquid hardening material is sprayed on the ground like a curtain and mixed with the stirring portion on average, the stirring with the ground is performed uniformly.

[0008] Further, the hardening material orifice is directed to the side that does not face the excavation direction, so that excavated earth and sand do not enter the orifice, and the orifice is clogged by the excavation operation of the fork. Did not occur.

Further, a guide plate is provided at a position facing the liquid hardening material jetting hole to guide the jetted hardening material jet in a predetermined direction to orient the hardening material jet and harden the target portion of the fork stirring operation. The material was intensively injected.

[0010] Further, the liquid hardening material ejection hole is formed in an overhanging nozzle structure, and the inner wall of the jet flow path of the nozzle is formed in a spiral structure so that the liquid hardening material is jetted out as a swirling flow. The mixing effect was enhanced.

Further, a liquid hardening material ejection hole in which the jet flow spreads in a fan shape in front of the hardening material ejection rod is set, and a high-pressure jet of the hardening material jet which spreads in a fan-shaped direction at an angle to the fork surface is provided. The cutting of the target ground excavated by the hardened material jet is performed.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a mixing fork, which is provided with liquid hardening material ejection holes 21 and 21 on a side wall at a central portion, and a liquid hardening material ejecting rod 2 which is curved in synchronization with a fork blade is provided.
Fork blades 11, 11 on both sides are supporting rods 12, 12
・ ・ Supported and fixed by

The tip of the mixing fork 1 is a cutting edge.
The excavator 3 in which 31, 31,... Are planted, and the rear end base portion is a base port 4 having attachment portions 41, 41 to the backhoe system 5, and the base port 4 has a hardened material ejection rod 2. A supply hose 42 from the liquid curing material preparation plant 6 for supplying the liquid curing material is connected.

The fork blades 11, 11 are appropriately provided with stirring blades 13, 13,... On their side surfaces, so that the target ground is inverted and stirred when the mixing fork 1 is operated.

Further, guide plates 14, 14 for guiding the hardening material jet in a predetermined direction are set at positions facing the hardening material jetting holes 21, 21 of the liquid hardening material jetting rod 2, and the jetting holes 21, 21 are provided.
The direction of the hardening material jet flow ejected from the nozzle is determined.

Further, according to the condition of the target ground, the hardening material ejection holes 21, 21 are formed as overhanging nozzles 22, 22, and the nozzles 22, 22 are provided.
The inner wall of the ejection flow path is formed in a spiral structure so that the liquid hardening material is ejected as a swirling flow, thereby enhancing the effect of mixing into the target ground. In this case, depending on the situation, the effect of the swirling flow is utilized without setting the guide plates 14 and 14. It is needless to say that the guide plate 14 is not set, and the ejection hole 21 may be left as it is without configuring the projecting nozzle 22.

In another embodiment, the present invention is applied to a hard ground such as a sandy soil or a gravel layer. As shown in FIGS. The material jet hole 21 is set, and the nozzle tip where the jet flow spreads in a fan shape is fitted into this, so that the hardened material jet that spreads in a fan shape in the direction making an angle with the fork surface is injected at high pressure toward the opposed ground. Be composed.

In this case, the pressure of the liquid hardening material is 100 to 1
The cutting is performed by high pressure injection of about 50 kgf / m ^{2, and the} cutting is performed by a hardened material jet on the portion B of the target ground to be excavated by the fork, so that the preliminary cutting of the excavated ground is performed in advance.

The liquid hardening material preparation plant 6 includes a cement hardening material supplied from a hardening material silo 61 for supplying a cement hardening material through a measuring device 64 and a water tank 63 to a pump 65.
Is supplied to the jetting rod 2 through the supply hose 42 by the pressure pump 66 at a slurry / mixing plant 62 where the W / C (water / cement ratio) is adjusted to 100-150%.

In the construction of the ground improvement, first, the hose piping and the amount of the hardening material are set according to the division of the target ground, and the like.
With the mixing fork device configured as described above, the environment such as clearance of the digging portion is set, and the liquid hardening material is pressure-fed to the liquid hardening material ejection rod 2 so that the hardening material ejection hole 2 is formed.
The mixing fork is operated while squirting or squirting from 1, 21 to excavate the target ground A and mix and agitate the excavated soil.

The pressure-feeding of the liquid hardening material depends on the working environment, but is usually performed at about 10 to 25 kgf / m ² , and the discharge amount of the liquid hardening material is about 200 liters per m ³ . However, depending on the construction environment as in the other embodiments described above, 10
In some cases, high pressure injection of about 0 to 150 kgf / m ² is performed.

The liquid hardening material blown out or injected from the hardening material blowout hole 21 is provided with a cutting blade 31, which is drilled and inserted into the target ground,
31 .... and the hardened material spout rod 2 parallel to the fork blade 11 are injected into the excavated soil and mixed with the excavated soil by the operation of the excavating blades 31, 31, ..., the fork blade 11 and the stirring blades 13, 13, ... Stirred.

When the excavation reaches a predetermined depth, it is confirmed that the discharge amount of the hardening material has reached the set amount, and the feeding of the hardening material is stopped. After stopping the pressure feed of the hardening material, the mixture is further stirred and mixed by leveling to perform surface finishing and leveling, and then a confirmation test is performed to complete the construction.

It should be noted that several mixing forks can be installed in parallel by setting the division of the target ground.

[0025]

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, and is an overall side view showing a construction state.

FIG. 2 is an enlarged perspective view of a mixing fork in which a protruding nozzle and a guide plate are set on a hardening material ejection rod, similarly showing an embodiment according to the present invention.

FIG. 3 is an enlarged perspective view of a mixing fork in which a hardening material ejection hole in which an ejection flow spreads in a fan shape in front of a hardening material ejection rod according to the embodiment of the present invention.

FIG. 4 shows an embodiment according to the present invention, in which a hardening material ejection hole is set in front of a hardening material ejection rod and a hardening material ejection hole spreads in a fan shape. Excavation situation side view

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mixing fork 11 Fork blade 12 Support rod 13 Stirring blade of fork blade 14 Guide plate 2 Liquid hardening material ejection rod 21 Hardening material ejection hole 22 Overhang nozzle 3 Drilling machine 31 Drilling blade 4 Base port 41 Mounting part to backhoe system 42 Liquid hardening material supply hose 5 Backhoe system 6 Liquid hardening material preparation plant 61 Hardening material silo 62 Slurry preparation plant 63 Water tank 64 Hardening material meter 65 Water pump 66 Slurry pump A

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2D012 DA00 2D040 AB11 AC05 BA13 BB03 CA01 CB03 DA11 DA16 EA01 EB04

Claims (5)

[Claims] 1. A liquid hardening material jetting hole is provided on a side wall, and a liquid hardening material jetting rod, which is curved in synchronization with a fork blade, is disposed at a central portion of the fork blade. Ground improvement method by mixing and agitation characterized by excavating the target ground while blasting or injecting high-pressure material, and mixing and stirring the excavated soil and liquid hardening material by operating a fork blade to create an improved hardened layer 2. A liquid hardening material ejection hole is provided in a side wall of the tip portion,
A ground improvement device by mixing and stirring, in which a mixing fork in which a liquid hardening material ejection rod that curves in synchronization with a fork blade is arranged at the center of the fork blade is attached to a backhoe system that communicates with a liquid hardening material supply mechanism 3. A ground improvement apparatus by mixing and stirring according to claim 2, wherein a guide plate for guiding the jetted hardening material jet in a predetermined direction is set at a position facing the liquid hardening material jetting hole. 4. The ground improvement apparatus by mixing and stirring according to claim 2, wherein the liquid hardening material ejection hole is formed in a projecting nozzle structure, and an inner wall of the nozzle ejection passage is formed in a spiral structure. 5. A ground improvement device by mixing and stirring according to claim 2, wherein a liquid hardening material jetting hole in which the jet flow spreads in a fan shape in front of the hardening material jetting rod.