JP4308410B2 - All casing drilling rig - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an all-casing excavator used for cast-in-place pile construction for constructing a foundation pile.
[0002]
[Prior art]
As a construction device used for cast-in-place pile construction to build foundation piles, the foundation pile hole is formed by removing the earth and sand in the casing with a hammer magnet etc. while pushing the casing into the ground while swinging or rotating. There is known an all-casing excavator that forms a cast-in-place pile by gradually pulling out a gripped casing while placing concrete in the casing after predetermined care such as insertion of a reinforcing bar.
[0003]
This all-casing excavator includes a swinging type that grips the casing with a band and pushes it into the ground while swinging with a cylinder (for example, Japanese Utility Model Publication No. 3-52262), and the ground while rotating the casing. There is a rotary type that pushes in (for example, JP-A-63-251520).
[0004]
As shown in FIG. 5, the swing type is provided with a ring-shaped lifting frame 22 having a band for gripping the casing and a chuck cylinder 24 on a base frame 21 by four lifting cylinders 23 so as to be lifted and lowered. The elevating frame is connected to a bracket 26 provided on the base frame 21 by two left and right swing cylinders 25.
[0005]
Then, the chuck cylinder 24 is operated to hold the casing by the band, and the left and right swing cylinders 25 are alternately expanded and contracted, the lifting cylinder 23 is contracted, and the casing is pushed into the ground while swinging.
Since the elevating cylinders 23 can be operated independently, the casing can be pushed vertically without the base frame 21 being placed horizontally.
[0006]
On the other hand, as shown in FIG. 6, the rotary type is provided with an elevating frame 32 that can be raised and lowered by elevating cylinders 33 provided at four corners of the base frame 31, and an upper portion connected by a plurality of chuck cylinders 35 on the elevating frame 32. A frame 34 is provided, and a rotating ring 42 is provided on the frame 34 via a bearing 36. A plurality of wedge-shaped chuck members 38 are suspended from the rotating ring 42, and a rotating body 39 that engages with the chuck members 38 is rotatably provided on the elevating frame 32 via a bearing 37. Further, the rotating body 39 is configured to be rotationally driven by a plurality of hydraulic motors 40 provided in the lifting frame 32. Furthermore, jacks 41 for level adjustment are attached to the four corners of the bottom surface of the base frame 31.
[0007]
6 shows a state in which the chuck cylinder 35 is contracted and the casing 30 is gripped by the chuck member 38, and the right half shows a state in which the grip is released.
[0008]
[Problems to be solved by the invention]
The swing type all casing excavator is driven by only three types of hydraulic cylinders, that is, the chuck cylinder 24, the lift cylinder 23, and the swing cylinder 25. Therefore, the apparatus is simple, has a small weight, is inexpensive, and is used for transportation and construction sites. There is no need for a large crane to move in. Therefore, the construction cost can be reduced. However, when the casing is swung and pushed in, as shown in FIG. 5, between the pushing stroke of the lifting cylinder 23, the rocking cylinder 25 moves along an arcuate locus with the mounting portion 25a of the bracket 26 as a fulcrum. Therefore, a difference of S is made in the stroke, and this is transmitted to the casing. Therefore, an eccentric load (horizontal load) is applied to the casing, and excavation resistance due to the side pressure is large, so that excavation cannot be performed on hard ground. Moreover, there exists a fault that a casing tends to shift | deviate with respect to a pile core. The swing cylinder 25 is a double rod type that does not apply a horizontal load due to the difference in cylinder force because it operates with one side extension and one side reduction when swinging. And Further, the verticality of the casing is adjusted by changing the speed of each lifting cylinder. However, since the stroke of each lifting cylinder can be different, there is a disadvantage that the casing must be adjusted again when gripping the casing.
[0009]
On the other hand, the rotary all-casing excavator has advantages in that excavation load is not applied to the casing, so that excavation resistance is small and excavation can be performed efficiently even on hard ground, but as shown in FIG. A complicated structure for gripping the casing such as the wedge-shaped chuck member 38 and the rotating body 39 is required, and a large-scale structure for rotating the casing such as the hydraulic motor 40 and the speed reducer is required, and the apparatus is expensive. There is a problem that the weight is large and the construction cost becomes high.
[0010]
For this reason, the installer prepares both the swing type and the rotary type and uses them depending on the ground condition at the construction site, which not only increases the cost but also makes the work complicated.
SUMMARY OF THE INVENTION An object of the present invention is to provide a rocking all-casing excavator that is sufficiently lightweight and has a simple structure that can be sufficiently constructed even on hard ground.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the present invention adopts the following means. That is, according to the first aspect of the present invention, the elevating frame is provided on the base frame via the elevating cylinder, and the elevating frame is provided with a chuck band and a chuck cylinder that are in circumferential contact and grips the casing , and the swing cylinder is operated to operate the casing. In the all-casing excavator for swinging, a plurality of single-rod swing cylinders are provided symmetrically with respect to the center of the casing so that the casing is rotated when the cylinder rod is extended .
[0012]
The present invention is an oscillating type all-casing excavator capable of being constructed even on hard ground .
[0013]
It is desirable that the elevating cylinder has a sliding portion for raising and lowering the elevating frame vertically with respect to the base frame, and the base frame is provided with jacks at the lower ends of the four corners so that it can be placed horizontally.
[0014]
The present invention can be applied to a rocking type casing excavator that has been used conventionally, and is particularly effective when a casing having a rotating bit provided at the tip is used on hard ground.
[0015]
That is, a plurality of single rod type oscillating cylinders are provided point-symmetrically with respect to the center of the casing so that the casing is rotated when the cylinder rod is extended, thereby rotating the casing with a large rotational force in its rotational direction. Once the oscillating cylinder comes to the stroke end, the casing can be once ungripped and the speed can be increased when the oscillating cylinder is reduced. Then, by holding and rotating the casing again, the casing can be efficiently rotated in one direction (fast gripping with a large rotational force).
[0016]
The invention according to claim 2 is provided with an elevating frame on the base frame via an elevating cylinder, the chuck frame and the chuck cylinder that are in circumferential contact and gripping the casing are provided in the elevating frame, and the casing is shaken by operating the swing cylinder. In an all-casing excavator to be moved , a plurality of single-rod swing cylinders are provided symmetrically with respect to the center of the casing so as to rotate the casing when the cylinder rod is extended , A detecting means for detecting opening, a detecting means for detecting the reduction and extension of the swing cylinder, and a control device for switching the electromagnetic switching valves of the chuck cylinder, the lift cylinder and the swing cylinder based on the information of the detection means; Oscillating cylinders with gripping casing and reducing lifting cylinder After operating and rotating the casing, the casing is released and the lifting cylinder is extended and the swinging cylinder is operated to reversely rotate the chuck band. Then, the casing is gripped and swinging while the lifting cylinder is contracted. It is characterized in that the operation of the cylinder is sequentially repeated.
[0017]
The present invention uses a casing which is provided with a rotating bit at the tip on a hard ground, and can automatically press-fit this in one direction. The detection means for detecting gripping / opening of the casing by the chuck cylinder and the detection means for detecting the contraction and extension of the swing cylinder may be appropriately used such as a pressure sensor, a limit switch, a timer, and a stroke sensor .
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on an embodiment shown in the drawings.
As shown in FIGS. 1 and 2, the all-casing excavator includes a base frame 1 provided with jacks 9 at four corners, and a lift frame 2 supported by four lift cylinders 3 so as to be lifted and lowered. A chuck frame 10 is provided above via a rolling bearing 4. The elevating cylinder 3 is provided with a sliding portion so as to elevate the elevating frame 2 vertically with respect to the base frame 1.
[0019]
The chuck frame 10 is provided with a chuck band 5 that is circularly connected by three divided band members 5 a, 5 b, and 5 c that surround the casing, and the band member 5 a and the band member 5 b are connected by a chuck cylinder 6. .
Further, mounting brackets 11 and 12 are attached to the outer periphery of the chuck frame 10 at opposing positions, and brackets 13, 14, 15, and 16 are fixed to the four corners of the elevating frame 2. The cylinder head side of a single rod type swing cylinder 8 is connected to the bracket 13, and the tip of the cylinder rod is connected to the mounting bracket 12. Also, the bracket 16 is connected to the cylinder head side of a single rod type swing cylinder 7, and the tip of the cylinder rod is connected to the mounting bracket 11.
[0020]
Although the bracket 14 and the bracket 15 are not used in FIG. 1, for example, the oscillating cylinder 8 can connect the cylinder head side to the bracket 15 as shown in FIG. Similarly, the swing cylinder 7 can be connected to the bracket 14. Further, both the oscillating cylinders 7 and 8 can connect the cylinder head side to the mounting brackets 11 and 12.
[0021]
Although not shown, control devices such as a hydraulic power source and a switching valve for operating each of the cylinders are separately provided. Note that electromagnetic switching valves are used for the operations of the chuck cylinder 6, the lift cylinder 3, and the swing cylinders 7 and 8, respectively. Furthermore, detection means (pressure switch) for detecting pressure oil in the chuck cylinder and detection means (limit switch) for detecting the contraction and extension positions of the swing cylinder are provided, and these output signals are sent to the control device. It is comprised so that.
[0022]
Next, the operation of the all casing excavator configured as described above will be described.
In a general ground including a soft ground, the swing cylinders 7 and 8 are in the state shown in FIG. 3, that is, the swing cylinder 7 has a tip of the cylinder rod attached to a mounting bracket 11 and a cylinder head side attached to a bracket 16 to 8 is used with the tip of the cylinder rod attached to the mounting bracket 12 and the cylinder head side attached to the bracket 15.
[0023]
First, the all casing excavator is suspended by a crane and placed so that the center of the all casing excavator matches the pile core. Next, the jacks 9 at the four corners of the base frame 1 are operated to bring the base frame 1 into a horizontal state. And let the raising / lowering cylinder 3 be in the extended state, and let the chuck cylinder 6 be in the extended state (the state in which the casing is not gripped).
[0024]
Next, a casing having a rocking bit at the tip is suspended and inserted into the central portion of the chuck band 5. Then, the chuck cylinder 6 is reduced and the casing is gripped by the chuck band 5.
Next, the elevating cylinder 3 is reduced while operating the swing cylinders 7 and 8. The operation of the oscillating cylinders 7 and 8 is repeated so that when one is on the expansion side, the other is on the contraction side. Thereby, the casing is pushed into the ground while swinging.
[0025]
When the lifting cylinder 3 is reduced to the stroke end, the chuck cylinder 6 is extended to release the casing, and the lifting cylinder 3 is extended. Then, the chuck cylinder 6 is reduced to grip the casing, and the swing cylinders 7 and 8 are operated. This operation is repeated to push the casing to a predetermined depth.
[0026]
Since one of the swing cylinders 7 and 8 is on the expansion side and the other is on the contraction side, the torque for rotating the casing in the left and right swing is the same. Further, since the eccentric load due to the difference in force between the oscillating cylinder 7 and the oscillating cylinder 8 is absorbed by the rolling bearing 4, almost the rotational force is transmitted to the casing, so that the excavation resistance is small and the misalignment is also caused. Not good.
[0027]
Next, construction on hard ground will be described.
In this case, the swing cylinders 7 and 8 are in the state shown in FIG. 1, that is, the swing cylinder 7 has the tip of the cylinder rod attached to the mounting bracket 11 and the cylinder head side attached to the bracket 16, and the swing cylinder 8 has the tip of the cylinder rod attached. The bracket 12 is used with the cylinder head side attached to the bracket 13. The casing uses a rotating bit attached thereto.
[0028]
The mounting of the all casing excavator on the pile core and the setting of the casing are the same as in the case of the above general ground. The lifting frame 2 is raised, the chuck cylinder 6 is reduced to grip the casing, and the swing cylinders 7 and 8 The elevating cylinder 3 is reduced while elongating.
[0029]
When the oscillating cylinders 7 and 8 come to the stroke end, the elevating cylinder 3 is stopped and the chuck cylinder 6 is extended to release the casing. Then, the swing cylinders 7 and 8 are contracted while the lift cylinder 3 is extended, and then the lift cylinder 3 is contracted while the swing cylinders 7 and 8 are extended by gripping the casing again. This operation is automatically repeated, and the casing is pushed into the ground while being intermittently rotated in the same direction.
[0030]
FIG. 4 shows a flow for automatically rotating and pushing the casing. The flow is started by raising the elevating frame 2 to set the casing in a vertically gripped state and turning on the automatic excavation switch.
First, in step 110, the solenoid on the reduction side of the electromagnetic switching valve of the chuck cylinder 6 is excited, the chuck cylinder 6 is reduced, and the chuck band 5 grips the casing. The detecting means for confirming that the casing 5 of the chuck cylinder 6 has been gripped is configured to output a signal (by a pressure switch) when the pressure oil to the chuck cylinder 6 reaches a predetermined pressure (step 120). As a result, the solenoid on the reduction side of the electromagnetic switching valve of the lifting cylinder 3 is excited and the lifting cylinder 3 is reduced (step 140), and the solenoid on the extension side of the electromagnetic switching valve of the swing cylinders 7 and 8 is excited to swing. The cylinders 7 and 8 are extended (step 130). When the swing cylinders 7 and 8 extend to the stroke end, a signal is output (this detection means is a limit switch), and both the electromagnetic switch valves of the swing cylinders 7 and 8 and the electromagnetic switch valve of the elevating cylinder 3 are Returned to neutral position. This stops the rotation and pushing of the casing (step 150).
[0031]
Next, in step 160, the solenoid on the extension side of the electromagnetic switching valve of the chuck cylinder 6 is excited, the chuck cylinder 6 is extended, and the gripping of the casing is released. Next, the solenoid on the extension side of the electromagnetic switching valve of the lifting cylinder 3 is excited and the lifting cylinder 3 is extended (step 180), and the solenoid on the reduction side of the electromagnetic switching valve of the swing cylinders 7 and 8 is excited and swings. The cylinders 7 and 8 are reduced (step 170). Then, when the stroke is reduced to the stroke end, a signal (by a limit switch) is output, and both the electromagnetic switching valves of the swing cylinders 7 and 8 and the electromagnetic switching valve of the elevating cylinder 3 are returned to neutral (step 190).
[0032]
Next, returning to step 110, the steps up to 190 are repeated.
With the above operation, the casing is continuously pushed into the ground while entering the ground while intermittently rotating in the direction of the arrow in FIG. At the same time as the rotary press-fitting of the casing, the work is performed in the above flow until the sand and sand in the casing is removed by a hammer magnet or the like and the automatic switch is turned off.
[0033]
In the above-described operation, the rocking cylinders 7 and 8 can both give a large rotational force to the casing because the cylinder rod is extended when excavating, and this rotational force is transmitted to the casing via the rolling bearing 4. In addition, since the forces are the same on the left and right, there is no uneven load (horizontal load) on the casing, there is little excavation resistance, and excavation can be performed efficiently even on hard ground. Furthermore, when the chuck cylinder 6 is extended, the gripping of the casing is released, and the swing cylinders 7 and 8 are contracted, the cylinder rod is on the contraction side, so the speed is high and the next excavation can be done quickly, so the construction time is reduced. It can be shortened.
[0034]
When the casing is rotated clockwise (in the direction opposite to the arrow in FIG. 1), the swing cylinder 7 is connected to the mounting bracket 11 and the bracket 14, and the swing cylinder 8 is connected to the mounting bracket 12 and the bracket 15.
In the embodiment described above, the swing cylinder is described as being attached to the brackets 13 to 16 provided at the four corners of the elevating frame and the mounting brackets 11 and 12 provided to the chuck frame. And four mounting brackets may be provided on the chuck frame. Further, stroke detection means may be provided in the lift cylinder 3 in automatic excavation, and the lift cylinder 3 may be reduced only during excavation and the lift cylinder 3 may be extended after one stroke of excavation.
[0035]
The present invention is not limited to such an embodiment as described above, and can be implemented in various modes without departing from the gist of the present invention.
[0036]
【The invention's effect】
As described above, the invention of claim 1 is provided with a plurality of single rod type oscillating cylinders point-symmetrically with respect to the center of the casing so as to rotate the casing when the cylinder rod is extended. Can be excavated efficiently by rotating in one direction using a casing equipped with a bit at the tip, and the casing can be constructed with the conventional swing type without the load being applied to the casing unlike the conventional swing type. Even if the hard ground that has not been used does not use an expensive and heavy conventional rotating type, it can be constructed by this apparatus.
[0037]
According to the second aspect of the present invention, after the casing is gripped and the swinging cylinder is operated while the swinging cylinder is contracted to rotate the casing, the casing is released and the lifting cylinder is extended and the swinging cylinder is operated. Since the chuck band is rotated in reverse and the casing is gripped and the swing cylinder is operated while the elevating cylinder is reduced, the casing is provided with a rotating bit on the tip of the hard ground. Using this, it is possible to automatically press-fit the rotation in one direction.
[Brief description of the drawings]
FIG. 1 is a plan view showing an entire all-casing excavator as an embodiment of the present invention, and shows a state in the case of rotary excavation.
FIG. 2 is an AA view of FIG.
FIG. 3 is a plan view showing a mounting state of a swing cylinder when the swing excavation is performed.
FIG. 4 is a flowchart showing a flow of control in the case of the automatic rotary excavation.
FIG. 5 is a side view of a conventional swing type all casing excavator.
FIG. 6 is a mechanism explanatory view of the rotary all casing excavator.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Base frame 2 ... Elevating frame 3 ... Elevating cylinder 4 ... Rolling bearing 5 ... Chuck band 6 ... Chuck cylinder 7, 8 ... Swing cylinder 9 ... Jack 10 ... Chuck frame 11, 12 ... Mounting brackets 13, 14, 15, DESCRIPTION OF SYMBOLS 16 ... Bracket 21 ... Base frame 22 ... Elevating frame 23 ... Elevating cylinder 24 ... Chuck cylinder 25 ... Swing cylinder 25a ... Mounting part 26 ... Bracket 30 ... Casing 31 ... Base frame 32 ... Elevating frame 33 ... Elevating cylinder 34 ... Upper frame 35 ... Chuck cylinder 36, 37 ... Bearing 38 ... Chuck member 39 ... Rotating body 40 ... Hydraulic motor 41 ... Jack 42 ... Rotating ring

Claims (2)

In an all-casing excavator for providing a lifting frame on a base frame via a lifting cylinder, including a chuck band and a chuck cylinder that surround and grip the casing in the lifting frame, and swinging the casing by operating the swinging cylinder, An all-casing excavator characterized in that a plurality of single-rod type oscillating cylinders are provided point-symmetrically with respect to the center of the casing so as to rotate the casing when the cylinder rod is extended. In an all-casing excavator for providing a lifting frame on a base frame via a lifting cylinder, including a chuck band and a chuck cylinder that surround and grip the casing in the lifting frame, and swinging the casing by operating the swinging cylinder, A plurality of single rod type oscillating cylinders provided symmetrically with respect to the center of the casing so as to rotate the casing when the cylinder rod is extended, and detecting means for detecting gripping / opening of the casing by the chuck cylinder; , A detecting means for detecting the contraction and extension of the swing cylinder, and a control device for switching the electromagnetic switching valves of the chuck cylinder, the lift cylinder and the swing cylinder based on the information of the detection means, and gripping the casing Operate the swing cylinder while shrinking the cylinder to After rotating the handle, the gripping of the casing is released, the lifting cylinder is extended and the swinging cylinder is operated to reversely rotate the chuck band, and then the swinging cylinder is operated while gripping the casing and reducing the lifting cylinder. An all-casing excavator characterized by sequentially repeating the steps.

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