JPH11107270A - Consolidated body construction method and earth retaining wall formation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To construct a consolidated body with a miniaturized device by constructing an earth retaining wall connecting the consolidated body inserting an H-shaped steel pipe consolidated body thereinto or the said consolidated body with one continuous stage of works from boring to casting. SOLUTION: First of all, an excavated hole 5 is excavated, a rod 1 having a monitor M on the front end is inserted into the said hole 5, and excavated water is jetted from nozzles 2 and 3 to widen a diameter of a steel pile insertion hole 6 to feed consolidation material. An H-shaped steel pile is inserted in a consolidated body before it is consolidated to construct the consolidated body. A plurality of consolidated bodies are constructed in succession at specific intervals, the consolidation material is injected between the said consolidated bodies to construct the consolidated bodies in succession, and an earth retaining wall having cut-off efficiency is formed. One method inserting no steel pile for injecting the consolidation material in order to arrange the consolidated bodies in succession or the other method can be used. By the constitution, execution with high degree of accuracy can be carried out, and the methods are applicable to execution having no room in space.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to at least one pair of nozzles provided at the tip of a rod. One of the nozzles ejects a high-pressure fluid jet radially outward and downward from the other nozzle, and the other of the paired nozzles is jetted. A high-pressure fluid jet is jetted from the nozzle so as to intersect with the jet from the nozzle at a predetermined position, and the jet is rotated to form a hole by a cross jet method in which a hole is drilled within a predetermined diameter. TECHNICAL FIELD The present invention relates to a method of constructing a consolidated body for injecting a material and a method of forming a retaining wall by the method.

[0002]

2. Description of the Related Art For example, a consolidated body constructed by inserting a stress material such as an H-shaped steel pile has a diameter much smaller than that of a consolidated body constructed by a normal jet grouting method. is there.
Here, in order to insert the H-shaped steel pile, the diameter is 500 to 1000.
A hole of about mm is required. Heretofore, a hole having a diameter of about 500 to 1000 mm as an H-shaped steel pile insertion hole of such a consolidated body has been drilled by, for example, a boring machine or the like.
However, drilling holes of this size with a boring machine requires extensive equipment and mechanisms.
Demands for excavation of small holes have been extremely high in order to reduce the size of the equipment or to save space, such as construction at sites where there is not enough space.

On the other hand, a known cross jet (cross jet)
The diameter of a hole drilled by the construction method can be controlled with high precision, and the present applicant has disclosed in Japanese Patent Application Laid-Open No. Hei 8-109786 a technique in which a pair of nozzles are provided at the tip of a rod to cut the ground by a cross jet. ing.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to construct a consolidated body by drilling with a small device without using a large boring machine or the like to excavate an insertion hole of an H-shaped steel pile. The purpose of this study is to provide a method for constructing a consolidated body that can be used, and a method for constructing a mountain retaining wall using the method.

[0005]

The method of constructing a consolidated body according to the present invention comprises a step of drilling a small-diameter excavation hole and a step of inserting a rod into the excavation hole. At least one pair of nozzles is provided, and a high-pressure fluid jet is jetted radially outward and obliquely downward from one nozzle, and a high-pressure fluid jet is jetted from the other nozzle of the pair with the jet from the nozzle. The rod is spouted so as to intersect at a predetermined position, and the rod and the pair of nozzles are rotated to excavate the ground into a cylindrical shape. And a stress material inserting step of inserting a stress material into the stress material insertion hole.

In the method of constructing a retaining wall according to the present invention, a plurality of consolidated bodies in which stress materials are inserted are continuously formed at intervals by the above-described consolidated body construction method, and the solidified structures are formed. Drilling a small-diameter excavation hole between the consolidated bodies, inserting a rod into the excavated hole, rotating the rod and a pair of nozzles to excavate the ground between the plurality of consolidated bodies into a cylindrical shape. Along with expanding the small-diameter excavation hole to a predetermined-diameter stress material insertion hole, a solidification material is injected to connect the plurality of solidified bodies together, thereby forming a water-stopping retaining wall. ing.

In the method for constructing a consolidated body according to the present invention, at least one pair of nozzles is provided at the tip end of the stress member, and a high-pressure fluid jet is jetted outward and obliquely downward from one of the nozzles. A high-pressure fluid jet is jetted from the other nozzle of the pair so as to intersect the jet from the one nozzle at a predetermined position, and the stress material and the nozzle are rotated to form a drilling hole having a larger diameter than the stress material. A stress material is inserted into the ground while drilling a hole, and a consolidated material is injected into the drilled hole.

Further, in the method of constructing a mountain wall according to the present invention, a plurality of compacts in which stress materials are inserted are continuously constructed at intervals by such a compact construction method, and the compacts are formed. Drilling a small-diameter excavation hole between the bodies, inserting a rod into the excavation hole, rotating the rod and a pair of nozzles to excavate the ground between the plurality of consolidated bodies into a cylindrical shape, The diameter of the small-diameter excavation hole is expanded to a predetermined-diameter stress material insertion hole, and a solidification material is injected to connect the plurality of solidified bodies together, thereby forming a water-stopping retaining wall. I have.

According to the method for constructing a consolidated body of the present invention as described above, an inner diameter suitable for inserting an H-shaped steel pile by performing high-precision drilling using the cross-jet method is adopted. The stress material insertion hole can be drilled with high precision.

[0010] Here, if drilling (high precision) utilizing the cross jet method as in the present invention, the apparatus or equipment for the drilling can be relatively small. In other words, there is no need for a large-scale device or mechanism as in the case of drilling a hole having a diameter of about 500 to 1000 mm in a conventional technique using a boring machine or the like.

Further, according to the method of forming a retaining wall of the present invention,
By connecting a plurality of compacts that are simply and accurately constructed by the compact construction method of the present invention, the connected water-stopping retaining wall can be efficiently constructed in a consistent process. .

[0012]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, at least one pair of a first nozzle 2 and a second nozzle 3 is provided on a monitor M provided at the distal end of a rod 1. These nozzles 2 and 3 eject a high-pressure fluid jet J1 outward and diagonally downward from a first nozzle 2 provided above, and form a pair with the first nozzle 2. The second nozzle 3 provided below is arranged such that the jet J2 intersects the jet J1 of the first nozzle at the circumferential position of the steel pile insertion hole 6, which is a predetermined position. I have.

First, as shown in FIG. 2, the solidified body 10 is constructed with a small diameter, for example, an excavation hole 5 having a diameter of about 100 to 125 mm.
Drilling (small hole drilling process). Next, as shown in FIG.
The rod 1 having the monitor M at the tip is inserted into the hole 5 and drilling water is jetted from the nozzles 2 and 3.
The consolidated material G is injected into the steel pile insertion hole 6 having a diameter of about 00 to 1000 mm (diameter expanding step). And before solidifying,
The shaped steel pile 4 is inserted (steel pile insertion step), and the consolidated body 10 is built.

As shown in FIG. 5, a plurality of the consolidated bodies 10 are continuously constructed at intervals, and a consolidated material 8 is injected between the consolidated bodies 10 and 10. Each consolidated body 10,
··· are connected to create a water stoppage retaining wall 11. Injection of the consolidated material 8 for connecting the consolidated bodies 10 and 10 may be performed by a method that does not insert the steel pile 4 in the above-described process, or any other method.

FIGS. 6 to 9 show another embodiment. In FIG. 6, a monitor M provided with at least one pair of nozzles 2A, 3A is attached to the tip of the H-shaped steel pile 4. From the first nozzle 2A provided radially outward, a high-pressure fluid jet J1 is jetted radially outward and obliquely downward, and provided inwardly in pairs with the first nozzle 2A. From the second nozzle 3A, the jet J1 of the first nozzle is jetted so as to intersect with the jet J2 at a predetermined position on the circumference of the insertion hole 6.

As shown in FIG. 7, drilling water is sprayed from the nozzles 2A and 3A while rotating the steel pile 4 to drill a larger insertion hole 6 than the steel pile 4, and the steel pile 4 is placed underground. Insert (steel pile insertion hole drilling process). Then, as shown in FIG. 8, the consolidated material G is cast into the insertion hole 6 (a consolidated material setting process), and the consolidated body 10 is built.

Further, as shown in FIG. 9, a plurality of the consolidated bodies 10 are continuously constructed at intervals, and
The solidification material 8 is injected between 0 and 10 to form each of the consolidated bodies 10.
Are connected to form the retaining wall 11 having water blocking property.

[0018]

The present invention is constructed as described above, and does not require a large-scale device, and is a solid body in which an H-shaped steel pile is inserted, or a water-stopping stake in which the solid bodies are connected. Walls can be efficiently constructed in a consistent process from drilling to casting. In particular, the cross-jet method enables high-precision construction and is suitable for construction where there is not enough space.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating one embodiment of a cross jet method constructed according to the present invention.

FIG. 2 is a plan view showing a state where a small-diameter drilling step according to the present invention is performed.

FIG. 3 is a plan view showing a state where a diameter expanding step according to the present invention is performed.

FIG. 4 is a plan view showing a state in which a steel pile insertion step of the present invention is performed.

FIG. 5 is an explanatory view of a method for forming a retaining wall of the present invention.

FIG. 6 is a cross-sectional view for explaining another embodiment of the cross jet method applied in the present invention.

FIG. 7 is a plan view showing a state in which a steel pile insertion hole drilling step of the present invention is performed.

FIG. 8 is a plan view showing a state in which a consolidated material casting step of the present invention has been performed.

FIG. 9 is an explanatory view of a method for forming a retaining wall according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Rod 2, 2A, 3, 3A ... Nozzle 4 ... Steel pile 5 ... Small diameter hole 6 ... Steel pile insertion hole 8 ... Solidification material 10 ... Solidified body 11 ・ ・ ・ Mounting wall G ・ ・ ・ Consolidation material M ・ ・ ・ Monitor

Claims (4)

[Claims] 1. A method comprising the steps of: drilling a small-diameter borehole; and inserting a rod into the borehole, the rod having at least one pair of nozzles at its tip, and A high-pressure fluid jet is ejected radially outward and obliquely downward, and a high-pressure fluid jet is ejected from the other nozzle of the pair so as to intersect the jet from the nozzle at a predetermined position, and the rod and A diameter expanding step of rotating a pair of nozzles, excavating the ground into a cylindrical shape, expanding the small-diameter excavation hole into a stress material insertion hole having a predetermined diameter, and injecting a consolidated material,
A stress material inserting step of inserting a stress material into the stress material insertion hole. 2. A plurality of consolidated bodies in which stress materials are inserted by the consolidated body construction method according to claim 1 are continuously constructed at intervals, and a small-diameter excavation hole is provided between the consolidated bodies. Drilling a hole, inserting a rod into the drilling hole, rotating the rod and a pair of nozzles to drill the ground between the plurality of consolidated bodies into a cylindrical shape to cut the small-diameter drilling hole to a predetermined diameter. Forming a diameter of the stress material insertion hole and injecting a consolidation material to connect the plurality of consolidated bodies to each other, thereby forming a water-stopping retaining wall; Construction method. At least one pair of nozzles is provided at the tip of the stress member, and a high-pressure fluid jet is ejected from one of the nozzles radially outward and obliquely downward, and high-pressure fluid is jetted from the other nozzle of the pair. A fluid jet is jetted so as to intersect the jet from the one nozzle at a predetermined position, and by rotating the stressed material and the nozzle, a drilled hole having a diameter larger than the stressed material is drilled while the stressed material is underground. And injecting a consolidated material into the drilled hole. 4. A plurality of consolidated bodies in which stress materials are inserted by the consolidated body construction method according to claim 3 are continuously constructed with an interval therebetween, and a small-diameter excavation hole is provided between the consolidated bodies. Drilling a hole, inserting a rod into the drilling hole, rotating the rod and a pair of nozzles to drill the ground between the plurality of consolidated bodies into a cylindrical shape to cut the small-diameter drilling hole to a predetermined diameter. The diameter of the retaining wall is increased by expanding the diameter into the stress material insertion hole and connecting the plurality of consolidated bodies by injecting a consolidated material, thereby forming a retaining wall having a water-stopping property. Construction method.