JP2001159130A - Mechanical-agitation air cement-milk mixing force- feeding method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method and a device, by which an environmental problems will not be generated by utilizing sludge and a ground is reinforced by a simple method at a low cost because the processing cost of discharged mud (sludge) is increased, when an underground pile in executed by a superhigh-pressure injection agitation method. SOLUTION: In this mechanical-agitation air cement-milk mixing force-feeding method and device, blade bits 3 are installed on three sides of a main body 1 detachably rotatably, an inner pipe 6 is mounted gently in the longitudinal direction of the center of the main body, an outer-pipe mounting section is set up to the upper section of the main body, and a spring is introduced around the inner pipe, a stopper 14 retaining the upper end of the spring introduced into an opening between the inner pipe and an outer pipe is fitted, an inner pipe 7 and an outer pipe 9 are connected to the upper sections of the inner pipe 6 and the outer pipe 8 in response to the depth of a drilled pit, the pipes are jointed, digging the pit gradually and the fixed pit is drilled and a steel ball 11 is introduced into the inner pipe 6 and the lower end section of the inner pipe is closed, the inner pipe is connected to the inner pipe 6 via a connecting pipe 10, and air and cement milk are mixed and force-fed through the injection pipe 8 secured to the inner pipe and injected into the pit and the pile is prepared, thus reinforcing the ground.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The method and apparatus for mixing and pumping air-mixed air-cement milk according to the present invention are for drilling holes in soft ground, mixing air and cement milk for pumping, injecting into holes, hardening, and cutting. It is an object of the present invention to provide a construction method and a device capable of constructing a pile by using mud discharged from a perforated hole and solving environmental problems without discharging mud and strengthening soft ground.

[0002]

2. Description of the Related Art Conventionally, when digging a hole in a soft ground by a mechanical method, a stabilizer such as bentonite is dissolved in water to prevent collapse, and air and cement powder or aggregate (sand) are used.
There is a mechanical agitation method that feeds wastewater and replaces it with sludge.

[0003] Conventional ground improvement methods mainly include a stirring method using ultra-high pressure injection, an auger stirring method using a large crawler pile driving machine, and a bit stirring method. The method of applying high pressure of 200Kgf to 400Kgf per square centimeter to milk and injecting from the tip of the nozzle to make a pile by pressure creates a lot of sludge. There was a problem.

[0004] The problem with the ultra-high pressure jet agitation method is that it is possible to perform construction with a relatively compact machine, but there is a large amount of sludge (discharge slime), and the processing method and high cost required for the processing are required. However, there is a serious problem that the sludge cannot be treated.

[0005] Problems with the auger stirring method using a large crawler pile driver include the problem that the construction machine is large and the construction site is limited, and the need to transport and install a large plant for construction. There is a problem that a large place must be set up. The cost is high and there is a problem that the target ground is limited.

[0006]

In order to strengthen soft ground, it is necessary to apply an ultra-high pressure jet stirring method. In that case, there is a problem in the treatment of the discharged mud (mud),
The present invention seeks to provide a method and an apparatus capable of strengthening soft ground in a simple and inexpensive manner without causing an environmental problem without using wastewater as wastewater because the processing cost becomes expensive. Is what you do.

[0007]

According to a method and an apparatus for mechanically stirring and mixing air cement according to the present invention, a blade bit protruding outwardly on three sides of a main body is detachably provided, and a fulcrum at one end of the blade bit is attached to the main body. The outer end of the blade bit is provided so as to be movable up and down, the inner tube is gently provided in the center longitudinal direction of the main body, the outer tube is provided above the main body, and the spring is inserted into the gap between the inner tube and the outer tube. By providing a stopper for locking the upper end of the inner pipe, providing an inner pipe connected above the inner pipe corresponding to the depth of the hole to be drilled, and connecting an outer pipe above the outer pipe, While drilling a hole, the pipe can be spliced to drill a predetermined hole, and after drilling the predetermined hole, a steel ball is put into the inner pipe, the inner pipe is closed, and the connection pipe (inner) is inserted. To connect the inner pipe and pump it through the inner pipe By injecting the admixture of earth and cement milk into the hole, in which it is possible to strengthen the ground by construct a concrete pillar in drilling it has been hole.

According to the first aspect of the present invention, a blade bit projecting outward from the main body is detachably provided, a fulcrum at one end of the blade bit is provided on the main body, and an outer end of the blade is vertically movable. The inner pipe is gently provided in the center longitudinal direction of the main body, the outer pipe is provided above the main body, a spring is inserted into the gap between the inner pipe and the outer pipe, the upper end of the spring is locked, and the depth of the hole to be drilled is reduced. Correspondingly, an inner pipe to be connected is provided above the inner pipe, and an outer pipe is connected above the outer pipe. Put the steel ball in the inner pipe, connect the inner pipe through the connecting pipe, pump the injection material mixed with air and cement milk, inject it into the hole drilled from the injection pipe through the inner pipe and harden To create a pile and strengthen the periphery of the pile to make it softer. It is a machine stirring air cement milk mixture pumping method to strengthen the ground.

According to a second aspect of the present invention, a blade bit protruding outward from the main body is detachably provided, a fulcrum at one end of the blade bit is provided on the main body, and an outer end of the blade bit is vertically movable. A spring for gently providing an inner pipe in the center longitudinal direction of the main body, providing an outer pipe surrounding the inner pipe above the main body, and absorbing a vibration of the inner pipe in a gap between the inner pipe and the outer pipe. The upper end of this spring is locked, an injection pipe is provided on the inner pipe, and a cutting bit is provided detachably below the inner pipe, and above the inner pipe corresponding to the depth of the hole to be drilled. Is provided with an inner pipe to be connected, and by connecting an outer pipe above the outer pipe, it is possible to connect the pipe while drilling a hole with the above cutting bit and drill a predetermined hole. It is a mechanical stirring air cement milk mixing and pumping apparatus.

According to a third aspect of the present invention, when a predetermined hole is drilled, a steel ball is put into the inner tube, and the inside of a cutting bit detachably provided at the tip of the inner tube is closed with the steel ball. Then, the inner pipe is connected to the inner pipe via a connecting pipe, and the injection body mixed with air and cement milk that is fed under pressure is injected into the hole from the injection pipe through the inner pipe, and the main body is lifted and drilled. The mechanically agitated air cement milk mixing and pumping device according to claim 2, wherein the ground can be strengthened by forming a pile in the formed hole.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The technical idea of the present invention is implemented in the embodiments as follows.

A blade bit protruding outward in three directions on the main body is detachably provided, a fulcrum at one end of the blade bit is provided on the main body, and an outer end of the blade bit is vertically movably provided.
The blade bit can be replaced with a blade bit having a different size depending on the N value of the clay or gravel on the ground to be improved and the condition of the gravel.

A hole is provided in the center longitudinal direction of the main body, the inner pipe is gently provided in this hole, a spring is inserted around the inner pipe, an outer pipe mounting portion is provided above the main body, and the outer pipe is provided therein. A stopper is provided for locking the upper end of the spring in the gap between the inner pipe and the outer pipe.

[0014] An inner pipe to be connected is provided above the inner pipe corresponding to the depth of the hole to be drilled, and an outer pipe is connected above the outer pipe. A predetermined hole can be drilled.

After drilling a predetermined hole, a steel ball was put into the inner tube, the inner tube was closed, the inner tube was connected via a connecting tube (inner), and air and cement milk were mixed through the inner tube. The injection material is pumped, and air and cement milk are injected into the hole from the injection tube provided in the inner tube and hardened, and a pile is formed in the hole drilled in the soft ground.

The present invention is embodied in strengthening a dike foundation, forming a foundation pile of a pier, protecting a dam of a reservoir, forming an underground pile on an eroded coast, and the like. The present invention can strengthen the soft ground on the rock surface 20 to 30 meters deeper than the seesaw mixing method within 3 meters below the ground surface. In this case, since the sludge is taken in, the air and the cement milk are mixed and hardened, there is no problem of the sludge treatment. The use of sludge makes it possible to construct a pile at low cost and a simple method without causing environmental problems, and to strengthen soft ground.

Normally, the pressure of the compressor is 7 Kgf per square centimeter, but when the depth increases, the pressure is applied at about 15 Kgf. At the time of drilling, the earth pressure is maintained by supplying air mainly with air and reducing the amount of water, and the earth pressure is maintained, so that the jamming phenomenon is a state in which the rod and the main body of the drilling machine do not rotate due to the earth pressure. This is a construction method that can also serve to prevent). When drilling holes, air and water are pumped, and at the time of pile formation, the injection material mixed with air and cement milk is pumped, so that a pile can be formed without causing a jamming phenomenon.

The method and apparatus of the present invention make it possible to form a lifting pile by injecting an injection material obtained by mixing air and cement milk with air pressure while stirring with a machine and injecting 2.5 cm steps in steps. It is a construction method.

[0019]

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings illustrate an apparatus for carrying out a mechanical stirring air cement milk mixing and pumping method according to an embodiment of the present invention. FIG. 1 is a front view of a mechanical stirring air cement milk mixing and feeding apparatus showing a state of drilling, and FIG. 2 is a front view of the same showing a state in which a steel ball is put into the inner pipe and then the inner pipe is connected via an inner. , FIG.
Is a front view showing the same state in which the impregnating material mixed with air and cement milk is injected into the through-hole through the inner pipe by enlarging the impeller bit, and FIG. 4 is reduced by raising the end of the impeller bit upward, FIG. 5 is a rear view showing the state in which the inner and steel balls are detached, FIG.
9 is a plan view of the same, FIG. 7 is a cross-sectional view illustrating the internal structure of the outer tube, FIG. 8 is a cross-sectional view illustrating the internal structure of the inner tube, FIG.
1 is a front view of a spring inserted into a gap between the inner tube and the outer tube, FIG. 10 is a cross-sectional view illustrating a connection state between the inner tube and the outer tube, and FIG.
1 is a side view illustrating a state in which a hole is drilled using the apparatus of the present invention mounted on a percussion, and FIG. FIG. 13 is a side view showing a state in which the piles are being formed, and FIG. 13 is a plan view showing the arrangement of pile diameters.

EXAMPLE A blade bit 3 is provided on three sides of a main body 1 of a device for performing a mechanical stirring air cement milk mixing and pumping method, and is detachably provided with a blade bit 3 at one end thereof. The outer end of the blade bit is provided to be vertically movable.

A hole 2 for providing an inner pipe in the center longitudinal direction of the main body 1
The inner tube 6 is gently provided in this hole, and a spring 12 is inserted around the inner tube 6 provided in the main body 1. An outer tube mounting portion 18 is provided above the main body 1. The outer tube mounting portion 18 is fitted with the lower portion of the outer tube 8 and connected by screwing, and a stopper 14 for locking the upper end of the spring in the gap between the inner tube 6 and the outer tube 8 is provided.

The inner pipe 6 is provided with an injection pipe 5 which, when the blade bit 3 is opened (expanded), goes down to be horizontal on the upper part of the blade bit 3 so that it can be moved from the compressor and the grout pump. The injection material mixed with air and concrete milk pumped through the inner pipe can be injected into the hole.

An inner pipe 7 to be further connected is provided above the inner pipe 6 corresponding to the depth of the hole to be drilled. The outer tube 9 is also connected above the outer tube 8. By adjusting and connecting the inner pipe and outer pipe to appropriate lengths depending on the condition of the ground to be drilled,
While digging a hole, a pipe can be spliced and a hole can be drilled to a desired depth.

When a predetermined hole is drilled, a steel ball 11 is put into the inner pipe 6 and is put inside a cutting bit 15 provided below the inner pipe, and the inner pipe is closed.
0, and the main body is pulled up while injecting into the hole from the injection pipe 5 provided in the inner pipe the cement milk which is pumped from the grout pump through the inner pipe by the pressure of the air of the compressor, and the soft ground. The air and the cement milk are mixed with the mud and hardened, and the pile 17 can be formed in the hole drilled in the soft ground.

The operation of the present invention when the apparatus of the embodiment is used at a construction site for ground improvement by the method of the present invention will be described with reference to the drawings. The device of the present invention is mounted on a percussion and installed on soft ground, and the blade bit 3 is detachably attached to the tip of the inner pipe by operating the percussion 16 in a state of being closed on the side surface of the main body 1. A desired hole is drilled with the cutting bit 15.

At the time of drilling, 10 to 20 liters of air and water are mixed per minute from the tip of the cutting bit of the double pipe lot of the inner pipe and the outer pipe. Depending on the depth of the drilling, air and water with an air pressure of 7 kgf / square centimeter to 20 kgf / square centimeter are mixed and sent, and the bit is stirred to soften the soil and prevent the jamming phenomenon.
It creates muddy water with high viscosity and specific gravity, and can sufficiently maintain the pore wall. Further, the blade bit can be easily enlarged at the start of the formation. The size of the blade bit is also determined by the N value and the size of the gravel.

When the drilling is completed, the inner tube is cut off, a steel ball 11 is put in the inner tube, the inner tube is closed, and the inner tube is connected via the inner 10, so that the inner tube has the length of the inner tube. Can be lowered and the blade bit can be opened. Install a compressor and grout pump and connect the end of the hose to the inner tube.

At the time of formation, when the main body 1 is lifted, the blade bit 3 is opened in the drilled hole to expand the blade bit, and an injection material mixed with air and cement milk is pumped along the blade bit. When the ground is agitated, the permeability of air and cement milk is improved, and it can be pumped far. Further, the cement milk easily penetrates into the voids and the tap water, and the surrounding ground is stabilized.

When the blade bit is opened and enlarged, the injection pipe 5 mixed with air and cement milk can be injected by directing the injection pipe 5 connected to the inner pipe 6 toward the hole. The injection material mixed with air and cement milk is sprayed while rotating the device of the present invention in the hole, and the injection material mixed with air and cement milk is mixed with the mud in the hole and hardens, thereby soft ground. A columnar pile 17 can be formed in the hole drilled. After the injection of the injection material mixed with air and cement milk is completed, the cutting bit 15 detachably attached to the tip of the inner tube is removed, and the steel ball 11 in the inner tube is taken out and washed with water. After that, the cement milk left in the inner pipe etc. is washed away and moved to the next construction site.

[0030]

According to the present invention, the following effects can be obtained by the constitutions of the first to third aspects of the present invention.

When the mechanical stirring air cement milk mixing and pumping method according to the present invention is carried out on a construction site, the apparatus of the present invention is mounted on a percussion and drilled, a compressor and a grout pump are installed, and a hose is attached to the pump. Connect the end of the hose to the inner pipe, send air with the pressure of the compressor, and grout pump to mix the cement milk by pumping and mix the air with the air injected from the injection pipe into the hole through the inner pipe. The method of the present invention is a method in which almost no sludge is discharged, since the mixture is hardened by being mixed into the mud by injecting the injection material mixed with the cement milk.

Since the apparatus of the present invention can be manufactured in a compact body, the method of the present invention can be carried out even if a relatively small compressor and grout pump are used. Therefore, a machine that can be used in a narrow place can be used.

The miniaturization of plant equipment facilitates assembly, disassembly, and transportation.

Since the inner tube is provided inside the outer tube and a spring is inserted between the inner tube and the outer tube, the injection pipe connected to the inner tube is moved up and down to move the blade bit up and down. The operation of enlarging or reducing bits is easy.

An injection material obtained by mixing air and cement milk fed through the inner pipe is injected into the hole from the injection pipe,
When the apparatus of the present invention is lifted, the mud in the hole and the cement milk are mixed and hardened, and a pile can be formed in the hole cut in the soft ground.

The method of the present invention can be applied to all types of ground. The problem to be solved by using the apparatus for carrying out the method of the present invention is that the circulation of muddy water hardly generates sludge slam and the size of machinery and plant equipment can be reduced. The main point is that the workability is improved because it becomes possible, and all construction costs such as planning, drafting, and construction can be performed at low cost. This is the most appropriate ground improvement method.

[Brief description of the drawings]

FIG. 1 is a front view of an apparatus for performing a mechanical stirring air cement milk mixing and pumping method.

FIG. 2 is a front view of the same device showing a state in which a steel ball is put into an inner pipe via an inner tube.

FIG. 3 is a front view of the same device showing a state where a blade bit is enlarged and cement milk is injected into an inner tube through a hole.

FIG. 4 is a rear view of the same device showing a state in which the end of the blade bit is raised upward to reduce the inner bit and the steel ball;

FIG. 5 is a rear view of the above-mentioned device which is moved and installed.

FIG. 6 is a plan view of the above device.

FIG. 7 is a sectional view illustrating the internal structure of the outer tube.

FIG. 8 is a sectional view illustrating the internal structure of the inner tube.

FIG. 9 is a front view of a spring inserted between the inner pipe and the outer pipe.

FIG. 10 is a cross-sectional view illustrating a connection state between an inner tube and an outer tube.

FIG. 11 is a side view illustrating a state in which a hole is drilled using the device of the present invention mounted on a percussion.

FIG. 12 is a side view of the same device showing a state in which a cement pile is formed by injecting cement milk after completion of drilling.

FIG. 13 Pile diameter layout

[Explanation of symbols]

 1. . . Main body 2. . . 2. A hole for providing an inner tube in the longitudinal direction at the center of the main body. . . Blade bit 4. . . Fulcrum 5. . . Injection tube (nozzle) 6,7. . . Inner tube 8,9. . . Outer tube 10. . . Connection pipe (inner) 11. . . Steel ball 12. . . Spring 13. . . 13. Gap between inner tube and outer tube . . Stopper 15. . . Cutting bit 16. . . Percussion 17. . . Pile 18. . . Outer tube mounting part

Claims (3)

[Claims] 1. A blade bit protruding outwardly of a main body is detachably provided, a fulcrum at one end of the blade bit is provided on the main body, and an outer end of the blade is vertically movably provided, and is provided in a central longitudinal direction of the main body. The inner pipe is provided gently, an outer pipe is provided above the main body, a spring is inserted into the gap between the inner pipe and the outer pipe, the upper end of the spring is locked, and the inner pipe corresponds to the depth of the hole to be drilled. After the inner pipe is connected above the outer pipe and the outer pipe is connected above the outer pipe, the pipe is spliced while digging a hole while mixing and feeding air and water, and after drilling a predetermined hole Put the steel ball in the inner pipe, connect the inner pipe through the connecting pipe, press the injection material mixed with air and cement milk into the inner pipe and inject it into the hole drilled from the injection pipe Mechanical stirring air cement milk mixing and pumping to strengthen soft ground by creating piles Law. 2. A blade bit protruding outwardly of the main body is detachably provided, a fulcrum at one end of the blade bit is provided on the main body, and an outer end of the blade bit is vertically movably provided. An inner pipe is provided gently, an outer pipe surrounding the inner pipe is provided above the main body, and a spring for absorbing vibration of the inner pipe is inserted into a gap between the inner pipe and the outer pipe. Stopping, providing an injection pipe on the inner pipe, and detachably providing a cutting bit below the inner pipe, and connecting an inner pipe above the inner pipe corresponding to the depth of the hole to be drilled. A mechanical agitation air, characterized in that by connecting an outer pipe above the outer pipe, a pipe can be drilled and a predetermined hole can be drilled while drilling a hole with the cutting bit. Cement milk mixing and pumping equipment. 3. When a predetermined hole is drilled, a steel ball is put into the inner pipe to close the inner pipe, and the inner pipe is connected to the inner pipe via a connecting pipe, and is fed through the inner pipe. Injecting material mixed with incoming air and cement milk through the inner pipe into the hole from the injection pipe, pulling up the main body and creating a pile in the drilled hole so that the ground can be strengthened The apparatus for mechanically stirring and mixing air-cement milk according to claim 2, characterized in that: