JP7344738B2 - Composite column construction equipment and construction method - Google Patents

Description

The present invention relates to an apparatus and method for constructing a synthetic column that effectively stirs and mixes a hydraulic solidifying material liquid and the original soil to homogenize the same in the construction of a synthetic column.

The applicant arranges a cylindrical hydraulic solidifying material liquid displacement columnar body at the axial center of the soil cement columnar body so that its axis substantially coincides with the axial center of the hydraulic solidifying material liquid displacement columnar body in the soil cement columnar body. In order to ensure and keep the outer diameter constant, the hydraulic solidification material liquid displacement column protrudes downward through the soil cement column, and the length of the protrusion is at least 1.5 mm longer than the diameter of the protrusion. A composite column of a soil cement columnar body and a hydraulic solidifying material liquid displacement columnar body, which is characterized by being five times as long, is provided (Patent Document 1).

The steps of the invention described above will be explained based on FIG. In the figure, 30 is a drilling rod, 31 is a drilling head, 32 is a discharge port for hydraulic solidifying material provided in the drilling head 31, 33 is a plurality of stirring blades provided at the lower part of the drilling rod, and 34 is a drilling head. Co-rotation prevention blades provided between the stirring blades 33, 35 are soil cement columns, and 36 are hydraulic solidifying material liquid displacement columns.

In step 1, the center position of the tip of the excavation head 31 is set at the center position of the pile in the ground (FIG. 6(a)). Next, in step 2, a construction machine (not shown) equipped with an auger motor capable of applying rotational force and capable of feeding and retracting the excavating rod 30 is gripped, and the excavating rod 30 is excavated while being rotated forward. After the lowest stage position of the lowest stirring blade 33 reaches the first predetermined depth (lower end position of empty excavation), the hydraulic solidification material liquid is discharged from the discharge port 32 of the excavation head 31, and excavation continues in this state. (Figure 6(b)). The amount of the hydraulic solidifying material liquid to be discharged is such that the quality of the soil cement to be constructed satisfies the required design performance.

In the next step 3, when the excavation head 31 reaches a predetermined depth (the lower end position of the synthetic displacement column to be constructed) (FIG. 6(c)), the rotation of the excavation rod 30 and the discharge of the hydraulic solidifying material are continued. while pulling the drilling rod 30 upward. At this time, the rotation direction can be either forward rotation or reverse rotation.

In the next step 4, as shown in FIG. 6(d), the drilling rod 30 is continuously rotated and the hydraulic solidifying material liquid is continuously discharged. shall be maintained at an amount that fills the space created by pulling up the drilling rod 30 and does not cause suction (negative pressure).

Further, at the position where the excavation head 31 reaches a predetermined depth, the soil cement columnar body 35 is not formed below the lowest stirring blade 33, so the soil cement columnar body 35 is not formed when the excavation head 31 is pulled up from this position. During this period, the hole formed below the stirring blade 33 of the drilling rod 30 and the drilling head 31 is filled with the hydraulic solidifying material liquid, and is pulled up to the lower part of the hydraulic solidifying material liquid replacement columnar body 36. A protrusion 36a is formed.

Further, in step 5, as shown in FIG. 6(e), the excavation rod 30 is lifted above the ground, and the hydraulic solidifying material liquid replacement columnar body 36 is filled up to a predetermined top level L, thereby completing the construction.

In the construction process of the synthetic column, when the hydraulic solidifying material liquid discharged from the discharge port 32 of the excavation head 31 during construction and the original ground soil are stirred and mixed, the co-rotation prevention blades 34 are activated underground due to ground resistance. It is prevented from rotating synchronously with the drilling rod 30 and stands still. Furthermore, by installing the co-rotation prevention blades 34 near the stirring blades 33, the soil clod excavated by the lowest stirring blades 33 can be efficiently shredded.

Therefore, the so-called co-rotation prevention effect is effectively exhibited, and the hydraulic solidifying material liquid and the original soil are reliably stirred and mixed to form a good soil cement columnar body 35.

As a result, the diameter of the hydraulic solidification material liquid replacement columnar body 36 after solidification is expanded with the soil cement columnar body 35 being integrally formed on the outer periphery of the hydraulic solidification material liquid displacement columnar body 36. An increase in the circumferential surface friction force and an increase in the vertical supporting force of the ground for the hydraulic solidifying material liquid displacement columnar body 36 are realized.

An object of the present invention is to provide a homogenized synthetic column by effectively stirring and mixing the hydraulic solidifying material liquid and the original soil in the construction of the synthetic column. Therefore, in the present invention, a discharge port for the hydraulic solidifying material liquid is formed at approximately the same position as the stirring blade. In this respect, in the invention described above, the discharge port 32 for the hydraulic solidifying material liquid was provided only in the excavation head 31 connected to the lower end of the excavation rod 31. Furthermore, stirring blades 33 were provided below the drilling rod 30.

Therefore, there is a vertical gap between the discharge port 32 of the hydraulic solidifying material liquid and the stirring blade 33, and after the hydraulic solidifying material liquid is first discharged into the original soil, the stirring blade mixes it with the original soil. The mixture was stirred and mixed. As a result, there were cases where the hydraulic solidification material liquid and the original soil were not sufficiently stirred and mixed.

In the synthetic column building apparatus of the present invention, discharge ports for the hydraulic solidifying material liquid are formed at two locations. Furthermore, when forming the discharge ports at two locations, it is possible to switch the discharge position by using a single-channel (one-channel) structure instead of a two-channel (two-channel) structure. Therefore, the entire device is simplified and its handling is easy.

The method for constructing a synthetic column of the present invention is to form a discharge port for the hydraulic solidification material at approximately the same position as the stirring blade, and simultaneously discharge the hydraulic solidification material and stir and mix the original soil with the stirring blade. It includes the process of performing. Therefore, the hydraulic solidification material liquid and the original soil are effectively stirred and mixed, and the composite column can be made homogeneous.

Patent No. 6159994

SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus and method for constructing a synthetic column that effectively stirs and mixes a hydraulic solidifying material liquid and the original soil to construct a homogenized synthetic column.

The synthesis column building device of the present invention which achieves the above object comprises: a hollow drilling rod having a stirring blade in its lower part and a discharge port for a hydraulic solidifying material liquid at approximately the same position as the stirring blade; The casing body has a flow path for the hydraulic solidifying material inside the casing body, which is composed of a drilling head provided at the lower end and having a discharge port for the hydraulic solidifying material, and two outlet ports are formed at the lower end. A channel pipe is rotatably fitted around the two outlet ports of the channel pipe, and by rotating the channel pipe at a predetermined angle, the channel pipe is fitted with the outlet port of the channel pipe and the excavation is performed. A flow port communicating with the discharge port of the rod, and a flow port communicating with the discharge port of the excavation head by rotating the flow pipe by a predetermined angle so as to fit with another outlet of the flow pipe. It is characterized by being provided with a formed valve body (claim 1).

According to the above configuration, the drilling equipment consisting of the drilling rod and the drilling head is gripped by a construction machine (not shown) equipped with an auger motor, rotates the drilling rod in the forward or reverse direction, and adjusts the hydraulic hardness according to the original soil. A synthetic column can be constructed by switching the discharge position of the solidifying material liquid.

Specifically, during excavation, the hydraulic solidifying material liquid is discharged from a stirring blade and a discharge port provided at approximately the same position as the stirring blade, thereby discharging the hydraulic solidifying material liquid and discharging the original soil by the stirring blade. Stirring is performed at the same time. Therefore, it is possible to provide a homogenized synthetic column in which the hydraulic solidification material liquid and the original soil are effectively stirred and mixed.

Furthermore, by rotating the channel pipe and discharging the hydraulic solidification material from the discharge port provided in the excavation head, the drilling rod is pulled up while rotating forward or backward, and the hydraulic solidification material is again mixed with the original soil. Stirring and mixing is performed. Therefore, it is possible to provide a synthesis column with further improved homogenization.

An embodiment of the synthetic column construction apparatus of the present invention is characterized in that a flow path operation part that can confirm and change the rotational position of the internal flow path pipe is provided near the upper end of the drilling rod. 2 ).

According to this embodiment, prior to construction work, it is possible to easily confirm which outlet is communicating with the flow path of the flow pipe and which outlet is not communicating with the flow path of the flow pipe. can. Furthermore, opening and closing of the discharge port can be switched and controlled during the construction process.

Another embodiment of the present invention is characterized in that a seal member is provided between the flow ports of the valve body to prevent passage of the hydraulic solidifying material liquid ( Claim 3 ).

According to this embodiment, the passage of the hydraulic solidifying material liquid between the flow ports is prevented, and the amount of the hydraulic solidifying material liquid supplied to each subsequent discharge port is accurately controlled.

A method for constructing a composite column using the above-mentioned composite column construction apparatus includes stirring the agitation while rotating in a forward direction the excavation device having a drilling rod provided with a stirring blade at the lower part and a drilling head provided at the lower end of the drilling rod. Excavating while discharging hydraulic solidifying material from a discharge port provided at approximately the same position as the blade, and after the excavation head reaches a predetermined depth, hydraulic solidifying material is discharged from the discharge port located approximately at the same position as the stirring blade. The method is characterized in that the excavation device is withdrawn while rotating forward or reverse while stopping the discharge of the liquid and discharging the hydraulic solidifying material liquid from a discharge port provided in the excavation head ( claim 4 ).

According to the method for constructing a synthetic column of the present invention, the discharge of the hydraulic solidification material liquid and the stirring of the original soil by the stirring blade are performed simultaneously, and the stirring and mixing of the hydraulic solidification material liquid and the original soil is effective. It will be held on. Further, during pulling up, the hydraulic solidification material liquid is discharged from the excavation head, and the hydraulic solidification material liquid and the original soil are stirred and mixed again. Thus, a homogenized composite column can be constructed.

According to the synthetic column construction apparatus of the present invention, when forming the discharge ports for the hydraulic solidifying material liquid at two locations, a single-channel (one-channel) structure is employed instead of a two-channel (two-channel) structure. By making it possible to switch the discharge position, the entire device is simplified and easy to handle.

According to the method for constructing a synthetic column of the present invention, a discharge port for the hydraulic solidifying material liquid is formed at approximately the same position as the stirring blade, and the hydraulic solidifying material liquid is discharged and mixed with the original soil by the stirring blade. can be performed simultaneously, providing a homogeneous composite column.

FIG. 1 is a schematic vertical cross-sectional view of a synthetic column building device of the present invention. 2 is a schematic vertical cross-sectional view of FIG. 1, (a) is a schematic vertical cross-sectional view of the excavation equipment, and (b) is a schematic vertical cross-sectional view of a flow pipe. It is a front view of a valve body and a flow path tip part. FIG. 3 is a perspective view of a channel tube operating section. FIG. 3 is a cross-sectional view showing a switching state between a flow path pipe and a valve body. FIG. 2 is a process diagram of a synthetic column building device provided by the applicant.

First, the synthetic column building apparatus of the present invention will be explained. The synthetic column building device of the present invention is formed from a casing body 1 and a flow pipe 2. Further, the casing body 1 includes a drilling rod 3, a drilling head 4, and a valve body 17, which will be described in detail later.

The drilling rod 3 has stirring blades 5 and 6 provided vertically apart from each other in its lower part, and a discharge port 7 for the hydraulic solidifying material liquid at approximately the same position as the lower stirring blades 6. In addition, 8 in the figure is a co-rotation prevention blade.

The excavation head 4 is provided at the lower end of the excavation rod 3 and has a discharge port 9 for discharging the hydraulic solidifying material liquid. Note that the discharge port 9 and the discharge port 7 are provided with check valves as necessary.

The flow path pipe 2 has a flow path 10 for the hydraulic solidifying material liquid formed therein, and further has two outlet ports 11 and 12 formed at its lower end. The outlet ports 11 and 12 are formed in the vertical direction in the embodiment.

In the present invention, the flow path pipe 2 is rotatably fitted inside the casing body 1.

First, the flow pipe 2 is fitted from the upper opening 13 of the drilling rod 3 constituting the drilling equipment 1, and the fitting part 14 formed at the upper part of the flow pipe 2 is inserted into the upper opening 13 of the drilling rod 3. It has been adapted and integrated.

The flow pipe 2 is supported concentrically and rotatably at the center of the drilling rod 3 and the drilling head 4. In the figure, 15 is a bearing.

In the present invention, a valve body 17 is provided around the hydraulic solidifying material liquid outlet ports 11 and 12 formed at the lower end of the flow path pipe 2, as shown in FIGS. 1, 2, and 3.

The valve body 17 is provided with a flow port at a predetermined angle, for example, at an angle of 70 degrees in plan view, to match the height positions of the two flow ports 11 and 12 formed in the flow path pipe 2. 18 and 19 are formed.

The communication port 18 can communicate with the discharge port 7 provided on the excavation rod 3, and the communication port 19 can communicate with the discharge port 9 provided on the excavation head 4. Note that this communication possibility is optional.

First, during excavation, by rotating the flow pipe 2 by a predetermined angle, the flow passage 10 and outlet 11 of the flow pipe 2 match with the flow port 18 of the valve body 17. As a result, the hydraulic solidifying material liquid is discharged from the discharge port 7 of the drilling rod 3 (FIG. 5(a)). On the other hand, the flow path 10 and outlet port 12 of the flow path pipe 2 and the flow port 19 of the valve body 17 are blocked. As a result, the hydraulic solidifying material liquid is not discharged from the discharge port 9 of the excavation head 4 (FIG. 5(b)).

Next, when looking at the time of pulling up, by rotating (returning) the flow path pipe 2 by a predetermined angle, the flow path 10 and outlet port 12 of the flow path pipe 2 are matched with the flow port 19 of the valve body 17. do. As a result, the hydraulic solidifying material liquid is discharged from the discharge port 9 of the excavation head 4 (FIG. 5(B)). On the other hand, the flow path 10 and outlet 11 of the flow path pipe 2 and the flow port 18 of the valve body 17 are blocked. As a result, the hydraulic solidifying material liquid is not discharged from the discharge port 7 of the drilling rod 3 (FIG. 5(A)).

In the figure, 20 is an O-ring that is a sealing member that prevents the hydraulic solidifying material liquid from passing between the communication port 18 and the communication port 19 formed in the valve body 17.

In the present invention, a flow pipe operating section 21 is provided at the upper end of the excavation rod 3, which allows confirmation and operation of the rotational position (switching position) of the internal flow pipe 2. As shown in FIGS. 4(a) and 4(b), the channel pipe operating section 21 has a horizontally elongated window hole 22 formed at the upper end of the drilling rod 3, and an operating pin 23 whose inner end is fixed to the channel pipe 2. The tip thereof is formed so as to be visible through the window hole 22.

For example, the state in which the operating pin 23 is moved to the left side of the window hole 22 (FIG. 2(a)) is the state in which the hydraulic solidifying material liquid is discharged from the discharge port 7 of the drilling rod 3 during excavation.

Further, when the operation pin 23 is moved to the right side of the window hole 22 (FIG. 2(B)), the hydraulic solidifying material liquid is discharged from the discharge port 9 of the excavation head 4 when the excavation head 4 is pulled up.

Therefore, prior to construction work, it is possible to easily confirm which outlet is communicating with the flow path of the flow pipe and which outlet is not communicating with the flow path of the flow pipe. Furthermore, opening and closing of the discharge port can be switched and controlled during the construction process.

An embodiment of the synthetic column building apparatus of the present invention has been described above. Specifically, the synthetic column building method of the present invention based on the synthetic column building device is such that during excavation, the hydraulic solidifying material liquid is discharged from the discharge port 7 provided at approximately the same position as the stirring blade 6 of the drilling rod 3. In this method, the hydraulic solidifying material liquid is discharged from the discharge port 9 provided in the excavation head 4 while stopping the discharge of the hydraulic solidifying material liquid from the discharge port 7 during pulling up.

That is, this method is characterized in that the hydraulic solidification material liquid is switched and discharged from a discharge port provided at approximately the same position as the stirring blade 6 and a discharge port provided in the excavation head 4 according to the construction process.

Although the embodiments of the construction apparatus of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and the design may be modified without departing from the gist of the present invention. Even if there are changes, etc., they are included in the present invention. In addition, the above-described embodiments can be combined by utilizing each other's technologies unless there is a particular contradiction or problem in the purpose, structure, etc.

1 Casing body 2 Flow pipe 3 Drilling rod 4 Drilling heads 5, 6 Stirring blades 7, 9 Discharge ports 11, 12 Outlet 17 Valve body 18, 19 Flow port 21 Flow pipe operating section

Claims (4)

A hollow drilling rod provided with a stirring blade in the lower part, a discharge port for hydraulic solidifying material liquid at approximately the same position as the stirring blade, and a discharge port for hydraulic solidifying material provided at the lower end of the drilling rod. A flow pipe having a flow path for a hydraulic solidifying material liquid and having two outlet ports at its lower end is rotatably fitted inside a casing body consisting of a drilling head and a hydraulic solidifying material liquid. Around the two outlet ports of the pipe, there is a communication port which is adapted to the outlet of the flow pipe by rotating the flow pipe at a predetermined angle and communicates with the discharge port of the drilling rod; It is characterized by being provided with a valve body which, by rotating the pipe at a predetermined angle, forms another communication port that fits with the other outlet of the flow pipe and communicates with the discharge port of the excavation head. Composite column building equipment. 2. The apparatus for constructing a synthetic column according to claim 1, further comprising a flow pipe rotating part near the upper end of the excavation rod that allows the rotational position of the internal flow pipe to be confirmed and operated. 3. The apparatus for constructing a synthetic column according to claim 1, further comprising a sealing member for preventing passage of the hydraulic solidifying material liquid between the flow ports of the valve body. 4. A method for constructing a synthetic column using the synthetic column building apparatus according to any one of claims 1 to 3, comprising: a drilling rod provided with a stirring blade in its lower portion; and a drilling head provided at the lower end of the drilling rod. While rotating the excavation device in the forward direction, the excavation device excavates while discharging hydraulic solidifying material liquid from a discharge port provided at approximately the same position as the stirring blade, and after the excavation head reaches a predetermined depth, The method is characterized by stopping the discharge of the hydraulic solidification material liquid from the discharge port provided at the excavation head, and pulling up the drilling equipment while rotating forward or reverse while discharging the hydraulic solidification material liquid from the discharge port provided in the excavation head. How to build a composite column.

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