JP2009084822A - Steel pipe press-in auxiliary device and steel pipe press-in method using the same - Google Patents

Abstract

[PROBLEMS] To provide a steel pipe press-fitting auxiliary device excellent in workability and capable of smoothly excavating a hard ground or rock with an auger screw without fixing a locking body by welding or the like to the upper inner peripheral surface of the steel pipe for each press-fit steel pipe The steel pipe press-in method using
A motor 16 of an earth auger 14 is placed and fixed on an upper end surface 12A of a casing 12 of a steel pipe press-fitting auxiliary device 10. A steel pipe coupling device 30 of the steel pipe press-fitting auxiliary device 10 is attached to the lower end portion of the casing 12 so as to be movable along the vertical direction of the casing 12. A steel pipe fastening body 38 formed in a semi-cylindrical shape is disposed in a notch 36 formed in the lower part of the coupling device main body 32. The steel pipe fastening body 38 can fasten the upper part 2A when the upper part 2A of the steel pipe sheet pile 2 is inserted into the coupling device main body 32.
[Selection] Figure 1

Description

  The present invention mainly relates to a steel pipe press auxiliary device used when pressing steel pipes such as steel pipe sheet piles into the ground or rock using a pile press machine when performing foundation work of construction work, and steel pipe press fitting using the same. Concerning construction method.

In foundation work at construction sites, steel pipe sheet piles as steel pipes may be buried by being pressed into the ground or rock using a hydraulic pile press.
In this case, if the ground into which the steel pipe sheet pile is pressed is a hard ground or a rock, it may be extremely difficult to press the steel pipe sheet pile into the ground or the bedrock only by a press-fitting operation using only a hydraulic pile press.
Therefore, the earth auger was suspended vertically with a crane, and the auger screw of the suspended earth auger was inserted into the steel pipe sheet pile, and the inside of the steel pipe sheet pile was excavated vertically, and the steel pipe sheet pile was used using a hydraulic pile presser A method of press-fitting is proposed.
In this case, however, the frictional resistance that the auger screw receives during excavation increases depending on the ground conditions and the rock condition of the excavation, and the frictional resistance is transmitted to the earth auger that is suspended vertically from the crane. The motor itself rotates and the driving force of the motor becomes difficult to be transmitted to the auger screw, and smooth excavation by the auger screw may be difficult.
Therefore, a steel pipe press-fitting auxiliary device that can smoothly press-fit steel pipes such as steel sheet piles with a pile presser by transmitting the driving force of the motor of the earth auger to the auger screw and smoothly excavating even hard ground or rock with the auger screw. And the steel pipe press-in method using the same is proposed (patent document 1).
However, in this steel pipe press-fitting auxiliary device and the steel pipe press-fitting method using the same, it is necessary to fix a locking body to the upper inner peripheral surface of the steel pipe by welding or the like for each steel pipe to be press-fitted.
For this reason, there exists a malfunction that a steel pipe press-fit operation becomes complicated and work efficiency is not good.
Japanese Patent Application No. 2006-110627

  The present invention has been made in view of the above-described fact, and for each steel pipe to be press-fitted, an operation capable of smoothly excavating a hard ground or rock with an auger screw without fixing a locking body to the upper inner peripheral surface of the steel pipe by welding or the like A steel pipe press-fitting auxiliary device having excellent properties and a steel pipe press-fitting method using the same.

The invention of claim 1 is a steel pipe press-fitting auxiliary device used when press-fitting a steel pipe into the ground or rock with a pile press-in machine, and a casing formed to be insertable into the steel pipe in a suspended state; An earth auger motor fixed to the casing, an auger screw of the earth auger that is inserted in the casing and arranged so that a tip end portion protrudes from a lower end surface of the casing, and an outer peripheral surface of the casing. A first locking body, a steel pipe connecting device inserted into the casing and movably attached to the lower end of the casing along the vertical direction of the casing, and constituting the steel pipe connecting device and having an upper portion of the steel pipe A connecting device main body that can be inserted, a second locking body that is formed on an inner peripheral surface of the connecting device main body and locks with the first locking body, and can be opened and closed to the connecting device main body. Is characterized by comprising comprises a Steel Pipe fastening body can be clamped to the top of the inserted steel tube to the connecting device main body together with the attached, to.
The invention of claim 2 is a steel pipe press-fitting auxiliary device used when a steel pipe is press-fitted into the ground or rock with a hydraulic pile press-in machine, and is a casing formed so as to be inserted into the steel pipe in a suspended state. An earth auger motor fixed to the casing, an auger screw of the earth auger that is inserted into the casing and is disposed so that a tip portion protrudes from a lower end surface of the casing, and an outer peripheral surface of the casing. A fixed first locking body, a steel pipe connecting device inserted into the casing and movably attached to the lower end portion of the casing along the vertical direction of the casing, and constituting the steel pipe connecting device and of the steel pipe A coupling device main body into which the upper part can be inserted; a second locking body formed on an inner peripheral surface of the coupling device main body for locking with the first locking body; and the coupling device main body. A formed notch portion, a steel pipe fastening body that is attached to the notch portion so as to be openable and closable and that can clamp an upper portion of a steel pipe inserted into the coupling device body, and is attached to the coupling device body and is And an opening / closing device capable of opening and closing the appendage.
The invention of claim 3 is a steel pipe press-in method that is carried out using the steel pipe press-in auxiliary device according to claim 1 or claim 2 when press-fitting a steel pipe into the ground or rock with a pile press-in machine, After holding the steel pipe to be pressed into the pile press, the steel pipe press auxiliary device is suspended by a crane, and the upper part of the steel pipe is inserted into the connecting body of the steel pipe connector provided at the lower end of the casing of the steel pipe press auxiliary device. The steel pipe tightening body of the connecting device body tightens the steel pipe to connect and fix the steel pipe press-fitting auxiliary device and the steel pipe, starts the earth auger of the steel pipe press-fitting auxiliary device, and excavates the ground and rock with the auger screw, The steel pipe is press-fitted by press-fitting the steel pipe into the ground or rock with the pile press-in machine.
The invention of claim 4 is a steel pipe press-in method that is performed using the steel pipe press-in auxiliary device described in claim 1 or claim 2 when a steel pipe sheet pile is press-fitted into the ground or rock with a hydraulic pile press-in machine. After the steel pipe sheet pile to be pressed into the hydraulic pile press machine is held, the steel pipe press auxiliary device is suspended by a crane to the connecting body of the steel pipe connecting device provided at the lower end of the casing of the steel pipe press auxiliary device. Insert the upper part of the steel pipe, tighten the steel pipe with the steel pipe clamp of the connecting device main body to connect and fix the steel pipe press-fitting auxiliary device and the steel pipe, start the earth auger of the steel pipe press-fitting auxiliary device, and ground with the auger screw The steel pipe sheet pile is press-fitted by excavating the rock pile and press-fitting the steel pipe sheet pile into the ground or the rock with the hydraulic pile press-in machine.

The steel pipe press-fitting auxiliary device of the present invention is capable of smoothly excavating a hard ground or rock with an auger screw before the pile presser presses the steel pipe into hard ground or rock, so the pile presser smoothly presses the steel pipe. It is possible to improve the work efficiency without complicated press-fitting work because it is not necessary to fix the locking body by welding etc. to the inner peripheral surface of the steel pipe for every steel pipe to be press-fitted into the ground or rock It has the effect.
The steel pipe press-fitting method using the steel pipe press-fitting auxiliary device of the present invention is capable of smoothly excavating a hard ground or rock with an auger screw before the pile presser presses the steel pipe into the hard ground or rock. Can smoothly press-fit the steel pipe and it is not necessary to fix the locking body to the inner peripheral surface of the steel pipe by welding or the like for each steel pipe to be pressed, so the press-in work is not complicated and the work efficiency of the steel pipe press-in is improved. It has an excellent effect of being able to.

  Examples of the best mode for carrying out the invention are shown below.

1 to 6 show an embodiment of a steel pipe press-fitting auxiliary apparatus and a steel pipe press-fitting method using the same according to the present invention. In this embodiment, a case where a steel pipe sheet pile 2 as a steel pipe is press-fitted into the ground 3 using a known hydraulic pile press-in machine 1 as a pile press-in machine will be described as an example.
1 and 2, the steel pipe press-fitting auxiliary device 10 of the present invention is suspended from a hook 4B of a crane 4A of a crane 4 disposed behind a hydraulic pile presser 1 (see FIG. 2). It is shown. The crane 4A of the crane 4 is provided with a steel pipe sheet pile wire 4C for hanging the steel pipe sheet pile 2 in addition to the hook 4B.
As shown in FIG. 2, the outer diameter dimension of the cylindrical casing 12 which is a constituent member of the steel pipe press-fitting auxiliary device 10 is smaller than the inner diameter dimension of the steel pipe sheet pile 2 press-fitted into the ground 3 by the hydraulic pile press-fitting machine 1. Is formed. Therefore, the casing 12 can be inserted into the steel pipe sheet pile 2 from the upper part 2 </ b> A of the steel pipe sheet pile 2. In addition, the said casing 12 shown in FIG.1 and FIG.2 is shown with the longitudinal cross-sectional view.
As shown in FIGS. 1 and 2, a motor 16 of an earth auger 14, which is a constituent member of the steel pipe press-fitting auxiliary device 10, is fixed to the upper end surface 12 </ b> A of the casing 12. The earth auger 14 is a known earth auger, and a long auger screw 18 is detachably attached to a lower portion of the motor 16 via a joint member 17.
As shown in FIG. 1, the auger screw 18 of the earth auger 14 is inserted through the casing 12, and the distal end portion 18 </ b> A of the auger screw 18 is disposed so as to protrude from the lower end surface 12 </ b> B of the casing 12. Accordingly, when the motor 16 of the earth auger 14 is started, the auger screw 18 rotates to excavate the ground 3.
Two locking recesses 20 as first locking bodies that are slightly shorter than the casing 12 are fixed to the outer peripheral surface of the casing 12 along the vertical direction at intervals of 180 °. As shown in FIG. 5, the locking recess 20 is configured by fixing rails 20 </ b> A and 20 </ b> A to the outer peripheral surface of the casing 12 in parallel in the vertical direction. A locking body accommodating portion 22 is formed between the rail 20A and the rail 20A of the locking recess 20. A locking body stopper 24 is fixed to the lower end portion of the locking recess 20 so as to close the lower end portion of the locking body housing portion 22.
As shown in FIGS. 1 and 2, a suspension wire 28 is attached to the upper end of the earth auger 14. This suspension wire 28 is adapted to be engaged with the hook 4B of the crane 4A of the crane 4 that suspends the steel pipe press-fitting auxiliary device 10.
As shown in FIG. 1, a steel pipe coupling device 30, which is one of constituent members of the steel pipe press-fitting auxiliary device 10, is attached to the lower end portion of the casing 12 so as to be movable along the vertical direction of the casing 12. .
As shown in FIGS. 3 and 4, the connecting device main body 32 of the steel pipe connecting device 30 is formed in a cylindrical shape, and the inner diameter of the connecting device main body 32 is that of the upper portion 2 </ b> A of the steel pipe sheet pile 2 (see FIG. 4). It is formed slightly larger than the outer diameter. Therefore, as shown in FIG. 4, the upper part 2 </ b> A of the steel pipe sheet pile 2 can be inserted into the coupling device main body 32.
On the inner peripheral surface of the upper part of the coupling device main body 32, two locking projections 34 as second locking members are provided so as to protrude from each other by appropriate means such as welding. These locking projections 34 are accommodated corresponding to the locking body accommodating portions 22 of the locking recesses 20 formed in the casing 12 respectively.
When the upper end portion of the casing 12 is inserted into the coupling device main body 32, the locking projection 34 of the coupling device main body 32 comes into contact with the locking body stopper 24 and is placed on the locking body stopper 24. Therefore, as shown in FIG. 1, the steel pipe coupling device 30 is attached to the lower end portion of the casing 12 without falling from the casing 12.
As shown in FIG. 3, a semicircular cutout 36 is formed in the lower part of the coupling device main body 32. A steel pipe fastening body 38 formed in a semi-cylindrical shape is disposed in the notch 36. Moreover, the steel pipe clamping body 38 is disposed so that the upper part 2A of the steel pipe sheet pile 2 can be tightened when the upper part 2A of the steel pipe sheet pile 2 is inserted into the coupling device main body 32. One end 38 </ b> A of the steel pipe fastening body 38 is connected to the connecting device main body 32 by a hinge 40. A hydraulic cylinder 42 as an opening / closing device is attached to the lower part of the connecting device main body 32. The tip 44A of the rod 44 of the hydraulic cylinder 42 is fixed to the other end 38B of the steel pipe fastening body 38 through appropriate means. Therefore, the steel pipe fastening body 38 can be opened and closed by extending the rod 44 of the hydraulic cylinder 42.
Further, as shown in FIGS. 2 and 6, joints 2B and 2B are fixed to the outer peripheral surface of the intermediate portion in the vertical direction of the steel pipe sheet pile 2 by appropriate means such as welding, so that the steel pipe sheet pile 2 can be connected in a continuous state. It is like that.

Next, an embodiment of a steel pipe press fitting method performed using the steel pipe press fitting auxiliary device 10 will be described.
As a preparatory stage, the hydraulic pile press-in machine 1 is disposed at the foundation construction site where the steel pipe sheet pile 2 is embedded. Moreover, the crane 4 which suspends the said steel pipe sheet pile 2 and provides it to the hydraulic pile presser 1 and also suspends the steel pipe press-fit auxiliary device 10 is arrange | positioned.
First, the crane 4 lifts the prepared steel pipe sheet pile 2 with a steel pipe sheet pile wire 4C provided on the crane 4A, and then provides it to the hydraulic pile press-in machine 1. As shown in FIG. 2, the hydraulic pile presser 1 provided with the steel pipe sheet pile 2 firmly holds the steel pipe sheet pile 2 with the chuck portion 1A in a state where the steel pipe sheet pile 2 is vertically set.
Next, the crane 4 locks the hook 4B of the crane 4A to the suspension wire 28 of the steel pipe press-fitting auxiliary device 10 and lifts the steel pipe press-fitting auxiliary device 10 vertically, The steel pipe sheet pile 2 sandwiched by the hydraulic pile presser 1 is made to correspond.
In addition, as shown in FIG. 1, the said steel pipe connection apparatus 30 is attached to the lower end part of the said casing 12 previously. Further, the rod 44 of the hydraulic cylinder 42 of the coupling device main body 32 is extended to open the steel pipe fastening body 38 (see FIG. 3).
Then, the steel pipe press-fit auxiliary device 10 is suspended so that the steel pipe sheet pile 2 and the steel pipe press-fit auxiliary device 10 correspond to each other, and the upper part 2A of the steel pipe sheet pile 2 is inserted into the lower part of the connecting device main body 32. Then, the steel pipe fastening body 38 is closed by contracting the rod 44 of the hydraulic cylinder 42. Thereby, since the upper part 2A of the said steel pipe sheet pile 2 is fastened by the steel pipe fastening body 38, the steel pipe sheet pile 2 and the said steel pipe connection apparatus 30 will be in a connection fixation state.
Then, the cylinder 12 of the steel pipe press-fitting auxiliary device 10 is further suspended, the motor 16 of the earth auger 14 is started, and the auger screw 18 is rotated. As a result, the tip 18A of the auger screw 18 projecting below the lower end surface 12B of the casing 12 begins to excavate the ground 3.
When the auger screw 18 starts excavation, a large frictional resistance may be generated in the auger screw 18 depending on the hardness condition of the ground 3 or the like. At this time, a large frictional resistance is transmitted to the motor 16 of the earth auger 14 via the auger screw 18, so that even if the motor 16 itself tries to rotate, the locking body accommodating portion of the locking recess 20 of the casing 12 to which the motor 16 is fixed. 22 includes a locking projection 34 of a steel pipe coupling device 30 that is connected to the steel pipe sheet pile 2 that is firmly held by the chuck portion 1A of the hydraulic pile press-in machine 1. For this reason, even if the motor 16 itself and the casing 12 itself try to rotate, they are blocked by the locking projection 34.
Therefore, even when a large frictional resistance acts on the auger screw 18 during excavation of the ground 3, the steel pipe sheet pile 2 in which the casing 12 to which the motor 16 is fixed is firmly held by the chuck portion 1 </ b> A of the hydraulic pile presser 1. Is prevented from turning by.
For this reason, since the motor 16 itself of the earth auger 14 does not rotate, the driving force of the motor 16 is smoothly transmitted to the auger screw 18 without being reduced. Therefore, even if the ground 3 is hard, the auger screw 18 smoothly Drilling can be done.
As a result, when the steel pipe sheet pile 2 is press-fitted by the hydraulic pile press-in machine 1, the hard ground 3 is excavated by the auger screw 18 of the steel pipe press-in auxiliary device 10 first. 2 can be smoothly press-fitted into the ground 3.
Further, when the auger screw 18 excavates the ground 3, the casing 12 of the steel pipe press-fitting auxiliary device 10 is engaged with the steel pipe connecting device 30 connected to the steel pipe sheet pile 2 firmly held by the hydraulic pile press-fitting machine 1. Since it will be in the state where it descends while being guided by the convex body 34, the auger screw 18 can excavate the ground 3 with higher accuracy than in the conventional method, and thereby the excavation accuracy by the auger screw 18 can be increased.
Then, when the work of press-fitting the steel pipe sheet pile 2 into the ground 3 is finished, the rod 44 of the hydraulic cylinder 42 is extended to open the steel pipe fastening body 38 to release the connection between the steel pipe sheet pile 2 and the steel pipe connecting device 30. The steel pipe press-fitting auxiliary device 10 is lifted.
And in order to press-fit the next steel pipe sheet pile 2 to the ground 3, the next steel pipe sheet pile 2 is press-fitted into the ground 3 by the same procedure as the said procedure.
Therefore, in the present invention, for each of the steel pipe sheet piles 2 to be press-fitted, the troublesome work of fixing the locking plate to the upper inner peripheral surface of the steel pipe sheet pile 2 by welding or the like is unnecessary, and the troublesome work is unnecessary, thereby making the steel pipe The work efficiency of the press-fitting work of the sheet pile 2 can be further improved.

In the embodiment, the locking concave body 20 is shown as the first locking body and the locking convex body 34 is shown as the second locking body, but the first locking body and the second locking body are the first locking body. If the stop body and the second locking body cooperate to prevent the motor 16 itself of the steel pipe press-fitting auxiliary device 10 from rotating during excavation, the locking concave body 20 and the locking convex body 34 may be used. Of course, the present invention is not limited to this configuration.
Therefore, for example, the locking concave body 20 is formed in a small size, or as shown in FIG. 7, one rail 20A is provided on the outer peripheral surface of the casing 12, and the locking convex body 34 of the steel pipe coupling device 30 is provided. Of course, it may be configured to be locked.

In addition, in the Example, although the steel pipe sheet pile 2 was shown as an example as a steel pipe press-fit in the ground 3, if the steel pipe to press-fit is a steel pipe, it is needless to say that it is not limited to the steel pipe sheet pile 2.
Moreover, in the Example, although the hydraulic pile presser 1 was shown as an example as a pile presser which presses in a steel pipe, if it is a pile presser which presses in a steel pipe, it is not limited to the hydraulic pile presser 1 Of course.
In the embodiment, the casing 12 is provided with two locking recesses 20 and the steel pipe coupling device 30 is provided with two locking projections 34. However, the casing 12 and the steel pipe coupling device 30 are fixed to the casing 12 and the steel pipe coupling device 30. Of course, the number of the locking recesses 20 and the locking protrusions 34 may be one or three or more.
In the embodiment, the hydraulic cylinder 42 is shown as the opening / closing device. However, the opening / closing device is not limited to the hydraulic cylinder 42 as long as the device can open and close the steel pipe fastening body 38.

It is a partial longitudinal cross-sectional view of the steel pipe press-fit auxiliary device of the embodiment suspended by a crane. It is a partial longitudinal cross-sectional view which shows the construction method which press-fits a steel pipe sheet pile using the steel pipe press-fit auxiliary | assistance apparatus of an Example. It is a perspective view of the steel pipe attachment / detachment apparatus of the steel pipe press-fit auxiliary | assistance apparatus of an Example. It is a partial perspective view of the state where the steel pipe press-fitting auxiliary device and the steel pipe sheet pile of the embodiment are connected. It is a side view of the casing of the steel pipe press-fit auxiliary device of the example. It is a schematic cross-sectional view of the state in which the steel pipe press-fitting auxiliary device and the steel pipe sheet pile of the embodiment are connected. It is a partial cross section figure of the state which inserted the steel pipe press-fit auxiliary apparatus which shows the other modification of the steel pipe press-fit auxiliary apparatus of an Example in the steel pipe sheet pile.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hydraulic press-fit machine 2 Steel pipe sheet pile 10 Steel pipe press-fit auxiliary device 12 Casing 14 Earth auger 16 Motor 18 Auger screw 20 Locking concave body 22 Locking body accommodating part 24 Stopper 30 Steel pipe coupling device 32 Connecting apparatus main body 34 Locking convex body 36 Notch 38 Steel pipe clamp 40 Hinge 42 Hydraulic cylinder

Claims (4)

  A steel pipe press-fitting auxiliary device used when a steel pipe is press-fitted into the ground or rock with a pile press machine, and a casing formed so as to be able to be inserted into the steel pipe in a suspended state, and a ground fixed to the casing An auger motor, an auger screw of the earth auger that is inserted in the casing and disposed so that a tip end portion protrudes from a lower end surface of the casing, and a first locking body fixed to an outer peripheral surface of the casing; A steel pipe coupling device inserted into the casing and movably attached to the lower end portion of the casing along the vertical direction of the casing; and a coupling device main body that constitutes the steel pipe coupling device and into which the upper portion of the steel pipe can be inserted. A second locking body that is formed on the inner peripheral surface of the coupling device main body and latches with the first locking body, and is attached to the coupling device main body so as to be openable and closable. Steel tube press-assisting apparatus characterized by both of a, and body Steel Pipe fastening capable of tightening the top of the inserted steel tube to the connecting device main body.   A steel pipe press-fitting auxiliary device used when a steel pipe is press-fitted into the ground or rock with a hydraulic pile press-in machine, a casing formed so as to be inserted into the steel pipe in a suspended state, and fixed to the casing. A motor for the earth auger, an auger screw for the earth auger that is inserted in the casing and disposed so that a tip end portion protrudes from a lower end surface of the casing, and a first latch fixed to the outer peripheral surface of the casing And a steel pipe coupling device that is inserted into the casing and movably along the vertical direction of the casing, and a coupling device that constitutes the steel pipe coupling device and into which the upper portion of the steel pipe can be inserted A main body, a second locking body that is formed on an inner peripheral surface of the coupling device main body and latches with the first locking body, and a notch formed in the coupling device main body; A steel pipe fastening body that can be attached to the cutout portion so as to be openable and closable and can fasten an upper portion of a steel pipe inserted into the coupling device body, and an opening and closing device that can be attached to the coupling device body and that can open and close the steel pipe fastening body. And a steel pipe press-fitting auxiliary device.   A steel pipe press-in method using the steel pipe press-in auxiliary device according to claim 1 or 2 when press-fitting a steel pipe into the ground or rock with a pile press-in machine, the steel pipe press-in into a pile press-in machine After the steel pipe press-fitting auxiliary device is suspended with a crane, the upper part of the steel pipe is inserted into the connecting device body of the steel pipe connecting device provided at the lower end of the casing of the steel pipe press-fitting auxiliary device. The steel pipe is fastened with a clamping body to connect and fix the steel pipe press-fitting auxiliary device and the steel pipe, the earth auger of the steel pipe press-fitting auxiliary device is started to excavate the ground or rock with an auger screw, and the steel pipe is pushed with the pile presser A steel pipe press-in method using a steel pipe press-in auxiliary device, which presses the pipe into the ground or rock.   A steel pipe press-in method using the steel pipe press-in auxiliary device according to claim 1 or 2 when a steel pipe sheet pile is press-fitted into the ground or rock by a hydraulic pile press-in machine, After sandwiching the steel pipe sheet pile to be press-fitted into the machine, the steel pipe press-fitting auxiliary device is suspended with a crane and the upper part of the steel pipe is inserted into the connecting device body of the steel pipe connecting device provided at the lower end of the casing of the steel pipe press-fitting auxiliary device, The steel pipe is clamped by the steel pipe clamp of the coupling device main body to connect and fix the steel pipe press-fitting auxiliary device and the steel pipe, the earth auger of the steel pipe press-fitting auxiliary device is started to excavate the ground and rock with the auger screw, A steel pipe press-in method using a steel pipe press-in auxiliary device, wherein the steel pipe sheet pile is press-fitted by press-fitting the steel pipe sheet pile into the ground or rock with a hydraulic pile press-in machine.

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