JP3264349B2 - Consolidated pile forming equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a consolidated pile forming apparatus for forming a consolidated pile in the ground by excavating the ground by high pressure jet jet and stirring a ground improvement material.

[0002]

2. Description of the Related Art The ground is excavated by a high-pressure jet jet,
In addition, a technique for forming a consolidated pile in the ground by stirring with a ground improvement material and improving the ground is known. Representative examples of such a method include a jet grouting method and a chemical charging pile method.

[0003] The jet grout method is a method in which the ground is cut by an ultra-high pressure jet and the air surrounding the jet, and a hardening material is poured into and filled in the void to form a consolidated pile.
In addition, the Chemical Charging Pile method uses a destructive force to inject hardened material into the ground at ultra-high pressure and cut the ground,
This is a method of forming consolidated piles in the ground.

[0004]

However, in such a ground improvement method, when a high-pressure jet jet is injected into the ground, the reach of the jet jet varies depending on the soil properties and soil properties. There is a tendency to prioritize injecting a ground improvement material and ensuring a large size of the consolidated pile, that is, the construction pile, and as a result, there is a problem in that material is lost and a large amount of slime flows out. In order to solve this problem, Japanese Patent Application No. 4-156531 by the present applicant discloses a technique for controlling the diameter of the finished pile, but the setting of the reach of the jet jet is not easy because it is manually adjusted.

[0005] Further, when the diameter of the consolidated pile is to be increased, the diameter of the hole to be initially drilled must be increased, but such drilling requires a great deal of labor and cost.

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned problems of the prior art, and provides an apparatus for forming a pile while accurately controlling the diameter of a finished pile to prevent loss of material and outflow of a large amount of slime. In addition, an object of the present invention is to provide a consolidated pile forming apparatus capable of saving a large amount of labor and cost for drilling a large-diameter hole.

[0007]

[0008]

SUMMARY OF THE INVENTION A consolidated pile forming apparatus according to the present invention is a consolidated pile forming apparatus for forming a consolidated pile in the ground by excavating the ground by high-pressure jet jet and stirring a ground improvement material. , An electric motor (2), a high-pressure pump (3) driven by the electric motor (2), and a hardener stirring processor (4)
And a pipe (6) supported vertically and rotatably by the consolidated pile forming apparatus (1) and having a cutting edge (5) attached to its tip. A guide pipe (60) slidably fitted around the outer periphery of the pipe (6), and a nozzle (7) provided at a fulcrum (61) provided near the cutting edge (5) of the pipe (6).
1) is pivotally mounted, and a nozzle (72) is pivotally mounted on a fulcrum (62) provided at the upper part of the pipe (6), and is provided at each free end of each of the nozzles (71, 72) described above. The linked fulcrums (73, 74) have links (6
5, 66) is pivotally connected to the guide pipe (6, 6).
The other ends of the links (65, 66) are pivotally connected to the fulcrums (63, 64) provided at the lower end and the upper end of the pipe (0), respectively, and the fulcrum (67) provided on the pipe (6).
The head of the air cylinder (8) is pivotally mounted on the rod, and the rod (81) of the air cylinder (8) is connected to the guide pipe (6).
0) is pivotally attached to a fulcrum (69).

[0009]

According to the present invention having the above-described structure,
A cutting edge is attached to the tip of a rotatably supported pipe, and when the rotating pipe is lowered, a vertical hole equal to the outer diameter of the cutting edge is excavated in the ground where a consolidated body is to be formed (a drilling step). . Then, the high-pressure liquid is sent to a pair of nozzles via a pipe, and the liquid ejected from each of the pair of nozzles excavates the ground. Since the pair of nozzles are arranged at intervals in the center direction of the pipe and opposed to each other, the jets jetted from each of the nozzles are so-called “cross jets”, and the jets collide with each other. Is extremely configured.

[0010] The angle formed by the center line of the pipe and the center line of the nozzle, that is, the jet angle of the jet, can be changed. Here, the intersecting position in the radial direction of the ejected high-pressure liquid jet (the position at which the jets collide with each other) is determined by the jet angle of the jet and the interval between nozzles (interval in the centerline direction of the pipe; constant). The radial reach of the cross jet is controlled by the jet angle of the jet. And the finished diameter of a pile can be controlled appropriately by soil property and soil property.

Therefore, by expanding or expanding the nozzle with respect to the center line of the pipe (widening injection process), the drilling hole having a large diameter is not drilled in the drilling process, and the nozzle in the drilling hole is formed. Can be positioned radially outward, and an effect equivalent to drilling a large-diameter excavation hole can be obtained. As a result, a great deal of labor and cost is expended in drilling large boreholes.

At the same time as controlling the radial distance of the high pressure jet, the height of the pile can be controlled to a desired height by moving the pipe. Finally, stop supplying high pressure liquid,
When the nozzle is closed (reduced or reduced in diameter) so as to be attached to the pipe, and the pipe is pulled up to the ground, the formation of the consolidated pile is completed.

Therefore, at a predetermined depth level, it is possible to easily control the finishing diameter to an arbitrary value, to prevent material loss and a large amount of slime from flowing out, and to greatly reduce the cost and labor required for work. Can be done.

[0014]

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

FIGS. 1 to 3 are views for explaining the steps of forming a consolidated pile using the apparatus according to the present invention, that is, FIG. 1 shows a drilling step, FIG. 2 shows a widening injection step, and FIG. 4 shows a nozzle opening / closing mechanism. FIG. 5 is a sectional view showing the completed consolidated pile.

In these figures, reference numeral 1 denotes a consolidated pile forming apparatus installed on the ground surface G, which is equipped with an electric motor 2, a high-pressure pump 3 driven by the electric motor 2, a hardening material stirring processor 4, and the like. , A pipe 6 with a cutting edge 5 attached to the tip
Are rotatably supported up and down so as to control the nozzles 71 and 72 attached to the pipe 6.

A guide pipe 60 is slidably fitted on the outer periphery of the pipe 6. A fulcrum 61 for pivotally connecting the base end of the nozzle 71 is provided near the cutting edge 5 of the pipe 6, and a fulcrum 62 for pivotally connecting the base end of the nozzle 72 is provided above the pipe 6. At the free ends of the nozzles 71, 72, fulcrums 73, 74 are provided, respectively, and at the lower end and the upper end of the guide pipe 60, fulcrums 63, 64, respectively.
Is provided. Links 65 and 66 are connected between the fulcrums 73 and 63 and the fulcrums 74 and 64, respectively. A fulcrum N is located at the uppermost end of the guide pipe 60.
A rod 8 of the air cylinder 8 is provided at a fulcrum N69.
One end is pivotally mounted, and a fulcrum 67 for pivotally mounting the head of the air cylinder 8 is provided on the pipe 6. When the air cylinder 8 is urged, the cylinder is contracted.

The inside of the pipe 6 is filled with a high-pressure liquid (not shown), for example, water or a hardening material, and is connected to the nozzles 71 and 72 by piping (not shown).

According to the above configuration, when the pipe 6 is lowered while rotating it in the direction of the arrow in FIG. 1, a vertical hole having the inner diameter of the cutting edge 5 is cut (drilling step). The high-pressure liquid is sent to the nozzles 71 and 72 via the pipe 6, so that the jetted high-pressure liquid is injected into the soil. These nozzles 71 and 72
Are at least one pair arranged facing each other along the pipe 6. In this case, a pair of nozzles are arranged on both sides of the pipe 6. In FIG. 3, when the air cylinder 8 is urged and contracted, the fulcrum N65 comes close to the fulcrum 67, so that the guide pipe 60 rises in the figure, and the nozzles 71 and 72 expand outward, respectively. Nozzles 71, 7
2 are opposed to each other and are simultaneously opened and closed, so that the jetted high-pressure liquid always intersects,
The distance R from the center line to the intersection T is
(See FIG. 2).

Therefore, the nozzle 7 for jetting the high-pressure liquid
By expanding 1, 72 with respect to the center line of the pipe 6 (widening injection step), the finished diameter of the pile can be appropriately controlled depending on soil properties and soil properties.
, The height of the pile can be controlled to a desired height.

When the pipe 6 is rotated while moving the hardening material from the nozzles 71 and 72 in either upward or downward direction, as shown in FIG. 3 to FIG. Will be completed in the ground. FIG. 3 shows an injection raising process when the pipe is raised.

Finally, the supply of the high-pressure liquid is stopped and the nozzle 71,
When the pipe 72 is closed so as to be attached to the pipe 6 and the pipe 6 is pulled up to the ground, the work of forming the consolidated pile is completed.

As the hardening material, for example, cement milk,
Mortar, medicine and the like.

The timing of jetting of the jet is determined by the condition of the construction at that time. Either jetting when the pipe 6 penetrates or jetting when the pipe 6 is pulled out may be determined according to the situation.

In some cases, two piping paths may be provided so that high-pressure water is ejected from the nozzles 71 and 72 and a hardening material having a lower pressure than the nozzle is discharged from a position (not shown) of the pipe 6.

[0026]

Since the present invention is constructed as described above, it is possible to easily control the finished diameter to an arbitrary value and to prevent a loss of material and a large amount of slime from flowing out.

Further, according to the present invention, the drilling hole having a large diameter is drilled by setting the position of the nozzle in the drilling hole radially outward without drilling the drilling hole having a large diameter in the drilling step. Since the same effect as described above can be obtained, a great deal of labor and cost spent when drilling a large-diameter hole is saved.

[Brief description of the drawings]

FIG. 1 is a view for explaining a drilling step of forming a consolidated pile using an apparatus according to the present invention.

FIG. 2 is a view for explaining a wide-width injection step of forming a consolidated pile using the apparatus according to the present invention.

FIG. 3 is a view for explaining an injection-raising process of consolidated pile formation using the apparatus according to the present invention.

FIG. 4 is a schematic configuration diagram showing a nozzle opening / closing mechanism of the apparatus according to the present invention.

FIG. 5 is a sectional view showing a completed consolidated pile.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Consolidation pile forming apparatus 2 ... Electric motor 3 ... High-pressure pump 4 ... Hardening material processing machine 5 ... Blade edge 6 ... Pipe 8 ... Air cylinder 60 ... Guide pipe 61, 62, 63, 64, 67, 73, 74 ... fulcrum 65, 66 ... link 71, 72 ... nozzle 81 ... rod G ... ground surface P ... consolidated pile R ・..Distance from cylinder center to intersection T ... Intersection

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-346020 (JP, A) JP-A-62-215712 (JP, A) JP-A-5-118027 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) E02D 5/46 E02D 3/12 102 E21B 7/24

Claims (1)

(57) [Claims] 1. A consolidated pile forming apparatus for excavating the ground by high pressure jet jet and agitating a ground improvement material to form a consolidated pile in the ground, comprising: an electric motor (2); and a motor driven by the electric motor (2). Pile forming device (1) composed of a high-pressure pump (3) and a hardening material stirring processor (4), which is vertically supported and rotatably supported by the consolidated pile forming device (1). And a guide pipe (60) slidably fitted around the outer periphery of the pipe (6), and a cutting edge (5) of the pipe (6) is provided. A nozzle (71) is pivotally attached to a fulcrum (61) provided near 5), and a fulcrum (62) provided above the pipe (6).
A nozzle (72) is pivotally mounted on a fulcrum (73, 74) provided at a free end of each of the nozzles (71, 72), and one end of a link (65, 66) is pivotally mounted on the nozzle (72). The other ends of the links (65, 66) are pivotally connected to fulcrums (63, 64) provided at the lower end and the upper end of the guide pipe (60), respectively, and are provided on the pipe (6). The fulcrum (67) is pivotally attached to the head of an air cylinder (8), and the rod (81) of the air cylinder (8) is pivotally attached to a fulcrum (69) provided on the guide pipe (60). A consolidated pile forming apparatus.