JPH03888B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a device for constructing cast-in-place piles with a relatively small diameter, and in particular, the present invention relates to a device for constructing cast-in-place piles of relatively small diameter, and in particular, the present invention relates to a device for constructing cast-in-place piles with a relatively small diameter. This invention relates to a ground stabilizing machine for forming a large number of short cast-in-place piles by stirring the soil at the ground, and forming a stable ground by the piles.

(Conventional technology) Conventionally, when constructing a building on soft ground, the pile driving method involves driving concrete or wooden piles, or drilling a hole with an earth drill and placing concrete, etc. in the hole. When filling the building with concrete, a driven pile method is used, and the weight of the building is supported by the piles. Also,
Another method used is to strengthen the ground by mixing ground stabilizers such as cement or other chemicals with the excavated soil.

However, in recent years, in order to prevent pollution problems, it is no longer possible to use the method of driving existing piles directly into the ground, and instead we are using methods such as cast-in-place piles, which generate less vibration and noise. I often do that.

However, when constructing ordinary houses or small concrete structures, the construction site is often very small, and the area where the excavated soil is transported and disposed of is often used for disposal. In the current situation where it is difficult to obtain such soil due to material processing, etc., it is necessary to prevent the discharge of excess soil.

In addition, since it is not possible to bring large equipment into the narrow site as mentioned above, a screw device similar to an earth drill or a drilling device with a flight or the like formed on the rotating shaft is used to In many cases, a soil conditioner such as cement milk is jetted out from the tip of the pump, stirring it together with the soil, and hardening the ground by solidifying the mixture.

As the ground improvement agent used in the above-mentioned construction method, granular ground improvement agents such as quicklime and cement, and slurry-based ground improvement agents such as cement milk are used. Conventionally, a ground improvement method has been commonly used in which the ground improvement agent is stirred and mixed with the soil in the soft ground using the above-mentioned excavation equipment, thereby hardening the ground.

For example, as a conventionally used device, there is one as shown in Japanese Patent Application Laid-open No. 153012/1983.

(Problems to be Solved by the Invention) However, in the conventional construction method, there is a problem in that the soil and soil conditioner are rarely completely mixed by the screw or the blade. On the other hand, by improving the shape of the blades of the drilling equipment, using a drive device with a complicated mechanism, and changing the direction of rotation of the blades during the drilling of the hole, it is possible to improve the relationship between soil and ground improvement agent. Despite efforts to mix well, there may be a large portion of the hole drilled into the ground where the soil and cement are not mixed.

In order to solve the above problem, it is necessary to use a means to make the diameter of the pile larger than necessary for the design load of the building, which has disadvantages such as waste of materials and work efficiency. There was a lot of heat.

(Object of the invention) The present invention aims to eliminate the drawbacks of conventionally used devices as described above.
To provide a device that enables quick and easy construction of cast-in-place piles with high strength, and also allows complete mixing of soil in the ground and soil improvement agent. With the purpose of
In particular, the object is to provide a ground stabilizing machine that does not generate noise during construction of cast-in-place piles and is inexpensive.

(Means and effects for solving the problem) The ground stabilizing machine of the present invention is supported by a truck such as a crane truck and is movable freely. An enlarged portion is provided through a long rod, and a guide rod is provided at the lower part of the enlarged portion, and a plurality of blades are fixed and protruded in a radial direction around the enlarged portion.

Then, by applying lateral and vertical vibrations to the ampulla with a vibrating device, small amplitude turbulent vibrations are generated in the blades, and the ground improvement is ejected from a nozzle formed around the ampulla. The agent and soil are thoroughly mixed.

Therefore, unlike conventional construction methods and devices, the device of the present invention can excavate a hole in the ground, mix, and consolidate the ground at the same time using vibration, and therefore the configuration of the device can be improved. This simplifies the construction process, and also improves the speed of pile construction.

Furthermore, when constructing cast-in-place piles using the device of the present invention, it is possible to perform the work while suspended from a crane vehicle, etc., so that the piles can be installed after excavating the foundation of the building. It is possible to carry out construction work or to easily carry out construction works at narrow sites. Furthermore, the device of the present invention can be suspended from a crane truck or the like to compact the ground and construct the foundation even in housing development sites called chick beds. Even in places where construction would otherwise be difficult, construction can be carried out easily.

(Example) To explain the present invention according to the drawings, as shown in FIG.
It is provided so as to be movable up and down along a guide column 3 supported via a boom 2 and the like. The wire 6 is wound up by the winch 5,
It is wound around the top sheave 7 and the bottom sheave 8, and causes the ground stabilization treatment machine to move up and down.

A vibration device 10 is supported on the lower sheave 8 via a hanger 19.
The upper end of the rod 20 is attached to the bottom via a fixing member 21.

Further, the hanging tool 19 is composed of a spring 19a, wire, etc., and is connected to the lower sheave 8 and the box body 1.
Since the spring 19a is provided in the middle of the suspension tool 19, the vibration of the vibration device 10 is alleviated, and the boom 2 of the truck 1 is connected to the boom 2 of the truck 1.
etc., so as not to affect the

The vibration device 10 is composed of a motor 11 and a vibration generator 13 connected to a shaft 12 of the motor 11, as shown in FIGS. 2 and 3. The vibration generator 13 used in the device of the present invention is formed by a rotating body 16 housed in a box body 14, and this rotating body 16 includes a pair of eccentric bodies 16a rotating in opposite directions, 16b,
Bevel gear 15 fixed to its shafts 17a, 17b
a and 15b are designed to mesh with a bevel gear 15 provided on the shaft 12.

Moreover, the above-mentioned shafts 17a and 17b are connected to the box body 14.
The box body 14 is supported by bearings 18a and 18b formed through a support member 18 on the side plates of the box body 14 and at the center thereof, respectively.
We ensure that the information is communicated to the

Then, the two eccentric bodies 16a and 16b are rotated in opposite directions, and the rotational force generated thereby is combined, and minute vibrations in the circumferential direction and the vertical direction are applied to the ampulla 25 via the rod 20. This is what I try to give.

The vibration device 10 of the present invention, like a commonly used vibration generator, can generate vibration amplitude by appropriately selecting the shape of the rotating body 16, the attachment relationship with the shaft, the rotation speed of the motor, etc. The frequency and direction of vibration can be set arbitrarily.

Therefore, minute vibrations in the circumferential direction and in the vertical direction are applied to the enlarged portion 25 provided at the lower end of the rod 20.

An enlarged portion 25 formed at the lower end of the rod 20
As shown in FIGS. 4 to 6, the cross section is circular and is formed approximately in the shape of a rugby ball, and blades 26 are provided on the outer circumferential surface thereof in a direction perpendicular to the tangential direction. It is formed with many radial protrusions.

Is this blade 26 straight or
It may be twisted, protruding perpendicularly to the tangential direction of the surface of the enlarged portion 25, and the blade may be fixed via a connecting portion 27 formed by welding or other fixing method. There is.

The enlarged portion 25 may be formed hollow inside, or may have a hole 29 passing vertically through the central portion.
It is connected to a hole 22 in a hollow rod 20. Furthermore, the hollow portion or hole 29 is connected to a large number of nozzles 28 protruding from the periphery of the enlarged portion 25 . Then, a soil improvement agent such as cement milk, which is supplied through a hose 23 from a supply device 9 composed of a mixer, a pump, etc., is sent through a rod and is ejected from the tip of a nozzle 28. There is.

In addition, a guide rod 2 is provided at the bottom of the ampulla 25.
4 is provided in a protruding manner so that the rod serves as a guide when a pile hole 31 is constructed in the ground.

When constructing cast-in-place piles using the device of the present invention, first, the guide rod 24 is driven into the ground by vibration as shown in FIG. The enlarged portion 25 is penetrated into the ground while applying rotational vibration. At this time, the blades 26 vibrate turbulently with a larger amplitude toward the tip, so that the soil and cement milk are mixed well.

Then, as shown in FIG. 7C, the enlarged part 25 is penetrated to a predetermined depth to form a cast-in-place pile 32, and then when the enlarged part 25 is pulled up, vibration is applied and cement milk is applied. Although the supply continues, the operation of penetrating the ampulla can be repeated multiple times.

Therefore, in the present invention, the soil improvement agent and soil are mixed multiple times for one pile, and the soil in the pile hole 31 is mixed with the liquid soil improvement agent sufficiently. to ensure complete consolidation.

The device of the present invention constructs cast-in-place piles in the ground using vibration, and the construction speed is as follows:
Compared to devices using conventional screws, etc., it is possible to perform the process at high speed, and in particular,
It can demonstrate its power in the construction of relatively short cast-in-place piles.

Further, in the present invention, since the enlarged portion 25 is formed to be relatively large with respect to the diameter of the pile to be formed, in the pile hole 31,
The distance between the pile wall and the nozzle 2 is getting smaller.
It is also possible to achieve the effect of preventing the soil improvement agent such as cement milk etc. spouted from the tube 8 from rising and escaping around the enlarged portion 25 and along the rod 20.

Furthermore, in the embodiment shown in FIG. 1, the ground stabilization treatment machine is shown as being moved along a guide column fixed to the trolley 1, but in the present invention, as shown in FIG. It is also possible to use it by hanging it in a straight line from the boom of a crane vehicle.

By configuring as described above, the device of the present invention can also be used for piling work in high places where a trolley cannot enter, low sites, or sites on the opposite side of a waterway. I can do it.

Furthermore, since the vibrations generated by the vibration generating device of the present invention are small amplitude vibrations, the device does not transmit vibrations to the surrounding ground, and uses a device that imparts large vibrations. There is no need for water in the ground to seep into the ground, as in the case of

As described above, the device of the present invention can mix the soil and cement milk well, thereby preventing the formation of areas in the soil that are not mixed with the soil conditioner. , which makes it possible to form a strong foundation, and furthermore,
This will prevent pollution problems from occurring during construction.

Furthermore, in the embodiment of the device of the present invention, the drive shaft 12 of the motor 11 is used as the vibration generating device.
A gear 15 is provided on the rotary body 16 to rotate the rotating body 16 in a straight line. However, it is also possible to use other parts such as a belt to transmit the driving force without relying on the meshing of the gears. I can do it.

By using the belt, it is also possible to prevent the motor 11 from being overloaded by causing the belt to slip when an overload occurs on the vibration generating section.

In addition, in the ground stabilization treatment machine of the present invention, devices with other structures such as a vibration generator provided with an eccentric rotating body on the vertical axis or an electromagnetic vibration generator may be used as the vibration device. It is possible, and furthermore, it is also possible to construct cast-in-place piles efficiently by changing the shape of the blades protruding from the ampullae depending on the nature of the soil on which the piles are to be constructed.

(Effects of the Invention) Since the device of the present invention has the above-described configuration, it can be sufficiently effective for construction work in narrow construction sites, and furthermore,
Construction speed can be increased compared to conventional methods.

Furthermore, the ground stabilization treatment machine of the present invention can reduce the price of the device and its running cost compared to those conventionally used.

Furthermore, in the present invention, since the soil in the ground and the ground improvement agent are well mixed, the piles formed thereby have sufficient strength, and therefore, when the piles are constructed, This makes it possible to reduce the safety factor and reduce the cost of building foundations.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the general configuration of the device of the present invention, FIG. 2 is a side view of the vibration device, and FIG.
A sectional view of the vibrating device, FIG. 4 is a side view of the ampullae,
5 and 6 are explanatory diagrams of the ampulla, and FIGS. 7A to 7C are explanatory diagrams showing the construction state of the cast-in-place pile. Symbols in the diagram: 1...Dolly, 2...Boom, 3...
...Guide pillar, 4...Guide, 5...Winch, 6
... Wire, 7 ... Top sheave, 8 ... Lower sheave, 9 ... Supply device, 10 ... Vibration device, 11
...Motor, 12...Axis, 13...Vibration generator,
14...Box body, 15...Gear, 16...Eccentric body,
17...shaft, 18...bearing, 19...hanger, 20
... Rod, 21 ... Fixed part, 22 ... Hole, 23
... Hose, 24 ... Guide rod, 25 ... Ampulla, 16 ... Vane, 27 ... Connection section, 28 ...
Nozzle, 29... hole, 30... ground, 31... pile hole, 32... cast-in-place pile.

Claims (1)

[Claims] 1. Supported by a movable truck such as a crane truck,
An ampulla is provided at the bottom of a vertically movable vibrating device via a rod, a hole is provided through the rod and the ampulla, and the ampullae is configured in the shape of a rugby ball or sphere with a guide rod provided at the bottom, A large number of blades are provided to protrude in a direction perpendicular to a tangent around the circumference of the ampulla, and at predetermined positions below and around the ampulla,
A ground stabilization treatment machine characterized by being equipped with multiple nozzles that eject a liquid ground improvement agent. 2. As a vibration device, a vibration generator configured to rotate two eccentric rotors in synchronization and in opposite directions is used to apply small-amplitude lateral and vertical vibrations to the ampullae via a rod. 2. The ground stabilization treatment machine according to claim 1, wherein the blades protruding from the ampullae are configured to vibrate turbulently due to the vibrations applied to the ampulla.