JP2000120058A - Device for stirring and mixing ground, etc. - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the constitution of a device to make it possible to rationally carry out work in such a construction that water is added to a stratum having low moisture content to uniformize chemical joint operation of a powdery hardener and ground strength. SOLUTION: A powdery hardener is supplied to a nozzle 10 having a rotary shaft 1 rotated by a rotary driving mechanism 11 and penetrated into the ground from the surface side of the earth or pulled out of the ground and stirring wings 9A and 9B provided to the lower end side of the rotary shaft 1 and provided around the stirring wing 9B through the inside of the rotary shaft 1, and the powdery hardener discharged from the nozzle 10 is stirred and mixed with ground soil. In that case, a liquid supply device 3 for introducing water, a dry air supply device 4 for introducing dry air and a powder supply device 5 for introducing the powdery hardener are respectively connected to a common supply pipe line 2 provided to the inside of the rotary shaft 1 through selector valves 6, 7 and 8, and the selector valves are changed over to selectively introduce the liquid, dry air and powdery hardener, and they can be discharged from the nozzle 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a method in which a solidified material such as cement is discharged in the ground, and a stirring blade is rotated to mix and mix the soil in situ with the solidified material in the ground. The present invention relates to an apparatus for agitating and mixing ground and the like used when forming an improved processing pile or the like.

[0002]

2. Description of the Related Art This type of stirring apparatus has a rotating shaft having a hollow inside and a stirring blade mounted on a lower end side of the rotating shaft, and is provided near the stirring blade via the inside of the rotating shaft. The powdered solidified material is supplied to the selected nozzle, and the powdered solidified material discharged from the nozzle and the ground soil are mixed with stirring. Effectively, the solidified solid material is discharged from the inside of the rotating shaft from the root of the stirring blade, etc., and the solidified solid material is chemically bonded to the in-situ soil such as viscous soil in the ground. Utilizing to improve the piles, stabilize the soil properties or improve the ground strength. In this soil improvement, the chemical bonding action of the solidified material changes depending on the soil properties such as the water content.For example, in the case of construction ground where the water content changes greatly in the depth direction, the ground strength is made uniform. Is difficult to process. Therefore, as such a countermeasure, in the construction process, soil properties are adjusted by adding water to soil or a stratum having a small water content (Japanese Patent Laid-Open No. 5-15843).
And Japanese Patent Application Laid-Open No. 6-257136).

FIG. 4 shows a main part of the apparatus described in Japanese Patent Application Laid-Open No. 6-257136. In the apparatus shown in the figure, an inner pipe 31 and an outer pipe 32 having a double pipe structure arranged along the inside of a rotating shaft (drilled pipe) 30, a rotation driving mechanism 31 for rotating the rotating shaft 30 forward and backward, and , Stirring blade 3 attached to the lower end of the shaft
And 3. The inner tube 31 and the outer tube 32 are assembled while maintaining a ring-shaped gap, and the upper side is shown in FIG.
As shown in FIG. 4B, it is extended from the rotating shaft 30 while being supported by the swivel joint 34, and the lower side extends to the vicinity of the root of the stirring blade 33 as shown in FIG. Of these, inner tube 3
A nichrome wire 35 is arranged inside the tube 1 along the vertical direction of the tube. The lower end of the inner pipe 31 is connected to a powder nozzle 36 protruding from the inside of the stirring blade 33 of the rotating shaft 30. The ring-shaped gap between the inner and outer tubes 31 and 32 is connected to a water nozzle 37 projecting from the rotary shaft 30 in a direction intersecting with the powder nozzle 36. The swivel joint 34 has two connection portions 34a,
34b. The upper connection part 34a is an external hose 38
Can be communicated with the inner tube 31, and the lower connection portion 34 b allows the outer hose 39 to communicate with the ring-shaped gap between the inner tube 31 and the outer tube 32. Then, powder cement is introduced into the inner pipe 31 from a supply means (batcher plant) via an external hose 38. Water is introduced into the gap between the inner and outer pipes 31 and 32 from a supply means (batcher plant) via an external hose 39.

In the above-described apparatus, the powder cement is pneumatically fed to the powder nozzle 36 through the outer hose 38, the connecting portion 34a, and the inner pipe 31 in the process of being pulled out after the rotary shaft 30 is penetrated to the design depth while being rotated. The powder is discharged from the powder nozzle 36 and is stirred and mixed with the in-situ soil by the stirring blade 33. And, in the construction ground, if it is found by preliminary investigation that there is a low moisture content stratum in the depth direction,
Water is supplied to the formation from the water nozzle 37 so that the formation can be adjusted to the optimum moisture absorption state. Further, in this structure, the water supplied along the inside of the rotating shaft 30 causes the rotating shaft 3 to rotate.
0, the inner pipe 31 for powder cement is cooled, and dew condensation occurs on the inner pipe 31 due to the low temperature. Since this dew hinders the normal supply of powder cement, the above-mentioned nichrome wire 35
To prevent dew condensation from occurring due to the heat generated, and to prevent clogging of the inner tube 31 and the like.

[0005]

In the above-mentioned apparatus, when the water content in the construction area changes in the depth direction, water can be added to the formation having a low water content. The chemical bonding action of the solidified material is maintained to a certain extent, and the improved ground strength is easily uniformed even in the depth direction. However, it has been found that this device structure has the following problems and cannot be satisfied. That is, in order to eliminate the condensation phenomenon caused by the water supply, this apparatus adopts a double pipe structure of the inner and outer pipes 31 and 32, and heats the nichrome wire 35 or the like for the powdery solidified material by the heater action. The temperature of the tube 31 is raised. However, as described in the same publication, even if an attempt is made to spirally attach the nichrome wire 35 or the like along the inner surface of the inner tube 31, the diameter of the inner tube 31 is restricted, and when the entire length of the tube is increased, the nichrome wire 35 is It cannot be attached properly or it becomes a problem in terms of cost. In addition, the flatness of the inner surface of the inner tube 31 is impaired by the attached nichrome wire 35 and the like, and the powdery solidified material that is pumped to the formed large and small irregularities adheres, and normal supply is maintained. It becomes difficult to do. Moreover, in this device, the path of the inner pipe 31 and the powder nozzle 36, the gap between the inner and outer pipes 31, 32, and the water nozzle 3
7 are formed, and when one is in use, the other is in non-use. For this reason, when the water addition time from the water nozzle 37 becomes longer, the powdered solidified material adhered in the powder nozzle 36 is easily solidified by the water and the like, and the powdered solidified material is again removed. In some cases, the powder nozzle 36 may not be able to discharge the powder normally even if the pressure is supplied.

The present invention has been made in view of the above background. The purpose is to enable more rational construction by simplifying the equipment configuration in a structure in which water can be added to the stratum with a low water content and the chemical bonding action and ground strength of the particulate solidified material are made uniform. An object of the present invention is to provide a stirring and mixing processing device for the ground or the like. Other objects will be clarified in the following description.

[0007]

In order to achieve the above object, the present invention provides a rotary shaft which is rotated by a rotary drive mechanism and penetrates or withdraws from the ground surface into the ground, and a rotary shaft provided at the lower end of the rotary shaft. Having a stirring blade attached thereto, supplying the particulate solidified material to a nozzle provided near the stirring blade via the inside of the rotary shaft, and a granular solid material discharged from the nozzle; In a stirring and mixing processing apparatus such as a ground for stirring and mixing ground soil, a liquid supply means for introducing a liquid such as water to a common supply pipe provided inside the rotary shaft, and dry air for introducing dry air. The supply means and the granular material supply means for introducing the granular solidified material are connected via a switching valve, respectively, and the liquid, dry air, and the granular solidified material are switched by switching the switching valve. Selective introduction and discharge from the nozzle One in which the.

In the above-described apparatus of the present invention, in a normal construction process in which a low water content layer or a hard layer does not exist in the depth direction, the liquid supply means and the dry air supply means are stopped, and the granular material supply means is operated to rotate. In the process of pulling out the shaft, etc., the powdered solidified material is pneumatically fed to the nozzle through an external hose, a switching valve, and a common supply pipe, discharged from the nozzle, and stirred and mixed with the in-situ soil by the stirring blade. On the other hand, when a hard stratum exists in the depth direction in the process of penetrating the rotating shaft, or when a stratum with a low water content exists in the process of penetrating or drawing out the rotating shaft, the liquid supply unit is operated. At the same time, the switching valve is switched in accordance therewith to supply liquid such as water to the nozzle through an external hose, a switching valve, and a common supply line, and is discharged from the nozzle. In a hard formation, it is softened in proportion to the amount of liquid ejected,
The penetration speed of the rotating shaft is normally maintained. In the formation having a low water content, the water content is adjusted in proportion to the amount of liquid, thereby maintaining the chemical bonding action of the solidified powder material and improving the improved ground strength. Then, after the liquid is discharged from the nozzle, the dry air supply means is operated, and the switching valve is switched in accordance with the operation to supply heated air or the like to the external hose.
Supply to the nozzle through the switching valve and common supply line,
Discharged from the nozzle. This operation is performed before the granular material supply means is operated again, and the common supply pipe line and the inside of the nozzle are dried by heated air or the like, and the powdery solidified material supplied thereafter is adhered in the tube. To prevent.

In the present invention, the liquid supply means is a mechanism for supplying a liquid such as water to the switching valve through a pump and a deformable external hose. The dry air supply means is
For example, it is a mechanism for supplying compressed air to the switching valve side at a predetermined pressure through an external hose or the like via a heater or the like. This compressed air can also be used as the air pressure feeding force of the granular material supply means. The granular material supply means is a mechanism for supplying the granular solidified material to the switching valve side through an external hose or the like by air pressure feeding. The switching valve is capable of selectively communicating any of the above means to the common supply line, and may be constituted by two or more.
This is a valve configuration that can be appropriately switched when introducing the dry air and the particulate solidified material. Therefore, in this device structure, since each means is individually well known in itself, the piping to the rotary shaft of the common supply line is simplified, and the switching valve itself may be a commercially available product. The agitation / mixing processing apparatus can be easily applied or configured with minimum cost.

[0010]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Although this embodiment is a preferred two specific example, it does not limit the technical scope of the present invention.

(First Embodiment) In a stirring and mixing processing apparatus of this embodiment, a configuration different from the conventional one is that a single common supply pipe 2 provided in a rotary shaft 1 is provided outside a liquid supply means provided outside. 3, dry air supply means 4, powder material supply means 5
Are connected via a switching valve 6 and switching valves 7 and 8, respectively, so that any one of a solidified material such as liquid, dry air, and cement can be selectively introduced.

The rotary shaft 1 has a cylindrical shape and has a common supply pipe 2 provided along the inside thereof, stirring blades 9A and 9B attached in two stages at the lower end of the shaft, and a root of the stirring blade 9B. A nozzle 10 is provided in the vicinity, and a rotary drive mechanism 11 and a swivel tube 12 are provided on the upper end side. And
At the time of construction, for example, the rotating shaft 1 is movably supported via a reader 13 and a winch mechanism on the base machine (not shown), and is penetrated or pulled out below the ground. The rotation drive mechanism 11 rotates the rotation shaft 1 forward and backward via an electric motor, a reduction gear mechanism, and the like, as in the related art, and is moved up and down along the reader 13.

The upper end 2a of the common supply pipe 2 is connected to the swivel pipe 1
2 and is connected to the outlet of the switching valve 6. The switching valve 6 has two inlets for connecting the external hoses 14 and 15, and switches each of the inlets so as to communicate with the outlet, that is, the common supply pipe 2.
It is provided in a state supported on the upper lid 12a. The lower end 2b is connected to a nozzle 10 provided near the base of the stirring blade 9B of the rotating shaft 1. Nozzle 10
Are arranged so that their discharge ports are oriented along the stirring blade 9B. Such a nozzle 10 may be provided on the stirring blade 9A side together with the stirring blade 9B side.

The outer hoses 14, 15 are deformable hoses. The external hose 14 forms a path between the outlet of the powder supply unit 5 and the switching valve 6 (one of the inlets). On the other hand, the external hose 15 is connected to the pipe 16 connecting the dry air supply means 4 and the granular material supply means 5.
A path is formed between the switching valve 8 and the switching valve 6 (the other introduction port) interposed in the middle of the above. The switching valve 7 is interposed in the middle of the external hose 15. This switching valve 7 is provided with water pumped from the liquid supply means 3,
The heating air supplied from the dry air supply means 4 is selectively switched to be supplied to the switching valve 6 side.

The liquid supply means 3 has a water storage tank 17, a pump 18, a hose 19 connected between the pump 18 and an inlet of the switching valve 7, and the like. The water in the tank 17 is supplied through the hose 19 to the switching valve 7 and the external hose 15. The dry air supply means 4 includes a compressor 20 and a heater 2
The compressed air generated by the compressor 20 is heated by the heater 21 and supplied to the external hose 15 via the switching valve 8. The dry air supply means 4 also serves as a means for pressure-feeding the powdery cement of the granular material supply means 5. That is, the granular material supply means 5
Temporarily stocks the particulate cement supplied from a silo or the like, and compresses the powder in the lower supply section 5a by compressed air from the dry air supply means 4 introduced into the lower supply section 5a via the switching valve 8. The granular cement is continuously fed by a predetermined amount to the external hose 14 side. The introduced compressed air is adjusted so that the heater 21 is stopped and not heated or the temperature rise is reduced.

The liquid supply means 3, the dry air supply means 4, and the powder supply means 5 are selectively driven in the following manner. In normal construction where there is no low water content layer or hard layer in the depth direction, in the process of pulling out the rotating shaft 1, etc.
Only the granular material supply means 5 is operated. Then, the powdery cement is supplied to the external hose 14, the switching valve 6, and the common supply line 2.
To the nozzle 10, and discharged from the nozzle 10 to be stirred and mixed with the in-situ soil by the stirring blades 9A and 9B. On the other hand, when a hard formation exists in the depth direction or a formation having a low water content exists, only the liquid supply means 3 is operated, and the switching valves 6 and 7 are switched accordingly. The water in the water storage tank 17 is supplied with the external hose 15, the switching valve 6,
It is supplied to the nozzle 10 through the common supply pipe 2 and is discharged from the nozzle 10 to around the stirring blade 9B. Then, the hard stratum is softened in proportion to the amount of the discharged water, so that the penetration of the rotating shaft 1 is maintained normally without delay. In a formation with a low water content, the water content is adjusted to be high. After the water is thus discharged, the dry air supply means 4 is operated, and at the same time, the switching valves 8, 7, and 6 are switched accordingly. The heated air is supplied to the pipe 16, the switching valves 8 and 7, the external hose 15, the switching valve 6, and the common supply line 2.
And is discharged from the nozzle 10. After a lapse of a predetermined time, the adhesion of water droplets and the like in the common supply pipe line 2 and the inside of the nozzle 10 is removed by the heated air, so that the subsequent powdery cement can be smoothly supplied. In such a drying method, the supply time until the common supply pipe line 2 and the nozzle 10 are completely dried, etc.
It is preferable to calculate in advance by a test or the like in accordance with the supply capacity or the like.

(Second Embodiment) This stirring and mixing processing apparatus comprises:
This is an example in which the paths of the liquid supply means 3, the dry air supply means 4, the granular material supply means 5, the common supply pipe 2, and the switching valve are changed. Therefore, in this embodiment,
The same members or parts as those of the apparatus of FIG. 1 are denoted by the same reference numerals, and the description thereof will be omitted. Only the changed points will be described in detail.

The common supply line 2 has an upper end portion 12a which is connected to the outside of the swivel tube 12 from around the tube.
The liquid supply means 3, the dry air supply means 4, and the granular material supply means 5 are arranged in a unitized state, connected to the switching valve 22, respectively, and provided between the switching valve 22 and the upper end portion 12a. Water, heated air, and powdery cement can be selectively supplied to the common supply pipe line 2 via the connected external hose 24, and a common control unit 23 is provided. The liquid supply means 3 has a pipe 25 connecting between the pump 18 and the inlet of the switching valve 22. The dry air supply means 4 is of a vertical type and has a pipe 26 connected between the outlet of the heater 21 and the inlet of the switching valve 22. The granular material supply means 5 temporarily stocks the granular cement, and compresses the powdery cement in the lower supply portion 5a from the pipe 27 to the switching valve 22 side by compressed air introduced from the compressor 21A into the lower supply portion 5a. To a continuous amount.

The control unit 23 controls the drive units of the means 3, 4, 55 and the operation of the switching valve 22. The control unit 23 controls the operation of the rotary shaft 1 from the power supply control unit attached to the electric motor of the rotary drive mechanism 11. The actual current value A _X at the time of penetration or the like is sequentially received, and can be compared with the set current value A for determination. FIG.
Indicates a flow when the actual current value A _X is compared with the set current value A to control the liquid supply means 3 and the dry air supply means 4. This control idea is, for example, that a hard stratum exists in the depth direction during the penetration process of the rotating shaft 1,
If formation of a low water content is present, wherein at actual current value A _X due to the load of the electric motor is greater than the set current value A, the liquid supply means 3 and the dry air supplying unit by using it 4 This is an example in which the operation of the system can be automatically controlled.

That is, when the control section 23 determines that the actual current value _AX is larger than the set current value A while the rotary shaft 1 is penetrating to the design depth (step 1), the control section 23 introduces the liquid supply means 3. At the same time, a switching signal is sent to the switching valve 22 to allow it, and at the same time, an operation signal is sent to the pump 18 of the liquid supply means 3 (step 2). Then, the water in the water storage tank 17 is supplied to the nozzle 10 through the pipe 25, the switching valve 22, the external hose 24, and the common supply line 2, and is discharged from the nozzle 10 to the current soil (steps 3 and 4). The discharge of water is continued until the actual current value A _X becomes smaller than the set current value A (step 5). Control unit 23, when the actual current value A _X is determined to set a current value smaller than A, switching to allow the introduction of drying air supply means 4 valve 22
At the same time, an operation signal is transmitted to the dry air supply means 4 and a stop signal is transmitted to the pump 18 (step 6). Then, the heated air of the dry air supply means 4 is pressure-fed through the pipe 26, the switching valve 22, the external hose 24, and the common supply pipe 2, and is discharged from the nozzle 10 (steps 7, 8). The pressurization of the heated air is continued until the operation time T _X of the dry air supply means 4 exceeds the time T determined by design (step 9). After the time T has elapsed, a stop signal is sent to the dry air supply means 4 and a switch signal is sent to the switching valve 22 (a signal for switching the valve to a neutral state,
Alternatively, a signal for switching to allow the solidified material supply means 5 to be introduced is transmitted (step 10). In addition,
Although the control of the granular material supply means 5 is omitted in FIG. 3, the control of itself is performed in substantially the same manner as in the related art. That is, in the process of pulling out the rotary shaft 1 and the like, the powder supply unit 5 is operated. The powdered solidified material such as cement is used for piping 2
7, switching valve 22, external hose 24, common supply line 2
Through the nozzle to the nozzle 10, discharged from the nozzle 10, discharged around the stirring blade 9B, and mixed with the soil in situ.

The apparatus of the present invention is not limited to this embodiment except for the technical elements described in claims 1 and 2, and may be appropriately changed according to the construction scale, conditions, etc., and the ground properties. Is what is done.

[0022]

As described above, the apparatus for agitating and mixing a ground or the like according to the present invention has a liquid supply means, a dry air supply means, Since the supply means is selectively used through the switching valve, the change of the existing stirring and mixing processing apparatus can be applied with a minimum, the apparatus can be simplified and the cost increase is small, and the nozzle can be connected to the nozzle as before. A trouble-causing factor such that the adhered powdery solidified material is solidified by the discharged water or the like is eliminated, and the reliability can be further improved. Further, in the device of the present invention, when the current value of the electric motor of the rotary drive mechanism exceeds a predetermined value, the liquid supply means is operated, and the liquid is supplied to the common supply pipe via switching of the switching valve. By supplying, the control of each means and the switching valve is simplified, the penetration speed of the rotating shaft is normally maintained, and the water content can be adjusted at the same time, so that more rational construction can be performed.

[Brief description of the drawings]

FIG. 1 is a configuration diagram schematically showing an example of a stirring and mixing processing apparatus of the present invention.

FIG. 2 is a configuration diagram schematically showing another example of the stirring and mixing processing apparatus of the present invention.

FIG. 3 is a diagram showing a control example of each means in the apparatus of FIG. 2;

FIG. 4 is a main part view showing upper and lower portions of a rotation shaft of a conventional device.

[Explanation of symbols]

 1 is a rotating shaft 2 is a common supply pipe 3 is a liquid supply means 4 is a dry air supply means 5 is a powder supply means 6, 7, 8, 22 is a switching valve 9A, 9B is a stirring blade 11 is a rotation drive mechanism Is the swivel tube 23 is the control unit

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Seiichi Nakamura Hokkaido, Sapporo City, Fukuko, 13-13, 8-31, (72) Inventor Nagai Tatsuya 14-11 Oasazawacho, Ebetsu City, Hokkaido F term (reference) 2D040 AB03 BA01 BA02 BA08 CA01 CB01 DB07 EA18 EA21 EB04 FA00

Claims (2)

[Claims] An agitating blade attached to a lower end of the rotating shaft, the rotating shaft being rotated by a rotary driving mechanism and being penetrated into or pulled out of the ground from the surface of the ground; A stirring / mixing treatment apparatus for a ground or the like that supplies the particulate solidified material to a nozzle provided in the vicinity of the stirring blade via a stirrer, and agitates and mixes the particulate solidified material discharged from the nozzle with the ground soil. In the above, the liquid supply means for introducing a liquid such as water, the dry air supply means for introducing dry air, and the solidified powder material are introduced into a common supply pipe provided inside the rotary shaft. The liquid, the dry air, and the particulate solidified material are selectively introduced by switching the switching valve by connecting the powder supply means and the powder supply means via the switching valve, respectively, so that the liquid can be discharged from the nozzle. Stirring / mixing processing equipment for ground etc. . 2. The liquid supply means is activated when a current value of an electric motor of the rotary drive mechanism exceeds a predetermined value, and communicates with the common supply line through switching of the switching valve. Item 2. A stirring and mixing processing apparatus for a ground or the like according to Item 1.