JPH0543011B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a method and apparatus for rotary press-fitting steel pipes (hereinafter referred to as casings) such as large-diameter steel pipe shafts used in foundation work of architecture and civil engineering. .

(Conventional technology) When constructing a casing, the earth and sand inside the casing is excavated and removed, so there is a well-known construction method that does not use a special excavator such as an earth drill.
There are construction methods disclosed in Publications No. 33-3085, No. 61-4957, and No. 61-6236. This known construction method involves, for example, suspending a medium digging tool consisting of a kelly bar and a rotary bucket into a casing using a crane, and rotating the digging tool by a rotary drive device attached to the top of the casing.
This is a construction method in which the casing is press-fitted without rotation while excavating the earth and sand inside the casing.

This known construction method has the advantage that it does not require a special-purpose machine and is not subject to the restrictions on earth removal height that are imposed by special-purpose excavators. However, the casing is press-fitted without rotating (this is because if the casing is rotated, the earth and sand inside the casing will be accompanied by friction with the inner surface of the casing, making it impossible to excavate with a bucket. (The casing does not rotate and only the excavating tool rotates.) Therefore, it was difficult to erect the casing on hard ground. In addition, in the device disclosed in the above publication, the drive device for rotating the digging tool for deep digging must be installed at a high position on the top of the casing, so it is difficult to handle the hydraulic hose or cab tire cable. The problem is that it gets in the way of your work. Furthermore, since the driving device of the digging tool for deep digging is large-scale, each time the casing is added, it becomes a big job, resulting in a loss of time and also poses a problem in terms of work safety.

(Problems to be Solved by the Invention) In view of the above-mentioned points, the present invention makes it possible to erect a casing even on hard ground by using a stationary casing rotary press-fitting device. The purpose of the present invention is to provide a rotary press-fitting method for erecting large-diameter steel pipe piles that can efficiently perform medium excavation by preventing the entrainment of internal earth and sand.

Further, the present invention provides a rotary press-fit type large-diameter steel pipe pile erecting device that eliminates the need to install a device for driving an excavating tool on the top of the casing, and can perform erecting work safely and efficiently. The purpose is to

(Means for solving the problem) In order to achieve this object, the first construction method according to the present invention is to perform preliminary press-fitting while rotating or rocking the casing, and then pull it up to the state before the preliminary press-fitting, and then At the same time, by rotating the casing and transmitting the rotational force of the casing to the digging tool for medium digging, the earth and sand in the area where the casing was previously press-fitted is excavated, and the digging tool is pulled out from the casing and placed on the ground. This construction method is characterized by repeatedly removing the earth and then press-fitting the casing in advance. According to this construction method, even though the excavation tool is rotated at the same time as the casing is rotated, Since the excavator excavates deeper than the lower end of the casing, excavation can be carried out without being affected by the trailing rotation of the casing.

Further, in a second method according to the present invention, excavation is performed in advance of the casing using a medium digging tool that rotates by transmitting the rotational force of the casing, and the excavation is performed to a certain depth. rear,
While keeping the excavating tool in that position, press-fit only the casing while rotating or swinging to the depth of excavation by the excavating tool, and repeating the process of placing the excavating tool in front of the casing and digging again, while erecting the casing. , is a construction method characterized by filling water inside the casing so that there is always a difference in water head with respect to the groundwater level, and according to this construction method, in addition to preventing tailgating as described above, In addition, water can prevent the pore walls from collapsing.

Furthermore, the device according to the present invention consists of a rotary press-fitting device for a casing installed on the ground, a kely bar rotatably suspended via a wire rope by a winch provided on a working machine, and an excavation bucket attached to its lower end. a rotary excavation tool for hollow digging; a ring-shaped rotational force transmission member that is attached to the top of a casing, through which the excavation bucket can pass, and that transmits the rotation of the casing to the excavation tool;
The rotary force transmitting member has a plurality of engaging portions that are removably engaged with a plurality of engaging portions disposed in the circumferential direction, and the Kerry bar is inserted through the member so as to be vertically movable and relatively non-rotatable. The above-mentioned object is achieved by this structure.

(Example) An example of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram for explaining the first construction method of the present invention. First, as shown in A, a ring-shaped rotational force transmitting member 7 is fixed to the top of the casing 3 with a fixing member 9 such as a bolt, The rotary press-fitting device 2 performs preliminary press-fitting while rotating or swinging.

As shown in FIG. 2, the rotary press-fitting device 2 that performs such press-fitting is equipped with a pedestal 1 to absorb the excavation reaction force.
A working machine 4 such as a crane is mounted on the pedestal 1. The basic structure of the rotary press-fitting device 2 is well known, but to explain the structure, a base frame 2a is held horizontally by a plurality of jacks 2e, and a ring-shaped elevating frame is attached to the base frame 2a. 2c, thrust cylinder 2
A casing holding device 2d is attached to the elevating frame 2c so as to be rotated or swung by a motor or the like. The casing holding device 2d holds the casing 3
It has a band that is tightened and chucked by a hydraulic cylinder or the like. Therefore, when press-fitting the casing 3, the casing 3 is chucked by the band of the casing holding device 2d, the casing holding device 2d is rotated or swung by the motor, and the casing 3 is moved to the ground while contracting the thrust cylinder 2b. It is press-fitted inside.

Further, as shown in FIGS. 3 and 4, the rotational force transmitting member 7 has approximately the same inner diameter as the casing 3, has a structure that fits into the casing 3, and has a protrusion, a hook-like member, or a It has a plurality of engaging parts 7a consisting of grooves etc., and has a plurality of through holes 10 in the part fitted to the casing 3,
The bolts 9 are inserted into each of the through holes 10 to close the casing 3.
It is fixed to the top of the casing 3 by screwing into a screw hole 11 provided in advance. Such attachment of the rotational force transmitting member 7 to the top of the casing 3 is carried out on the ground before the addition of the casing 3, so that no work at height is required.

After the casing 3 is press-fitted in advance in this way, the casing 3 is moved to the casing holding device 2d.
By extending the thrust cylinder 2b while being chucked by the band, the first
As shown in Fig. B, the casing 3 is pulled up to the state before the preliminary press-fitting, and the casing 3 is rotated at that position, and at the same time, the rotational force transmission member 7 and the Kerry bar 5 are inserted through the rotational force transmission member 7 so as to be vertically movable. The earth and sand below the casing 3, that is, the casing 3, was press-fitted in advance by rotating the excavation bucket 6 attached to the lower end of the Kelly bar 5 using the force that rotates the casing 3 through engagement with the member 8. excavate the part.

The medium digging tool 12 and the rotational force transmitted member 8 that perform such excavation are constructed as follows. As shown in FIG. 2, the Kerryba 5 includes:
It has a rectangular cross section and is suspended via a swivel joint 15 from a wire rope 14 wound around a winch 13 installed on the working machine 4.
and an excavation bucket 6 attached to its lower end constitute an excavation tool 12 for medium digging. Since the bucket bag 6 has an outer diameter slightly smaller than the inner diameters of the casing 3 and the rotational force transmitting member 7, it can be inserted into and removed from the casing 3.

As shown in FIGS. 2 and 4, the rotational force transmitted member 8 includes a frame 8a having both ends configured as engaging portions that are removably fitted into the groove-shaped engaging portions 7a.
and a rectangular tube portion 8b fixed to the center of the frame 8a, and the Kelly bar 5 is attached to the rectangle tube portion 8b.
is penetrated so that it can move up and down and cannot rotate relative to each other,
As shown in FIG. 2, when the bucket bag 6 is lifted up, the square tube part 8b rests on the collar 5a provided on the connection part of the Kelly bar 5 with the bag bag 6. Therefore, the winch 13 is operated in the direction of feeding out the wire rope 14, the bucket 6 is inserted into the casing 3, and both ends of the frame 8a of the rotational force transmitted member 8 are engaged with the engaging portion 7a of the rotational force transmission member 7. match,
Further, when the wire rope 14 is let out by the winch 13, the rotational force transmitted member 8 is transferred to the rotational force transmission member 7.
The bucket 6 descends while the Kelly lever 5 swings in the square tube part 8b while being engaged with the casing 3, and after the bucket 6 lands on the bottom of the casing 3, the casing holding device 2d of the rotary press-fitting device 2 is moved. Casing 3
By rotating while chucked by the band, the casing 3 is rotated, and along with this,
Due to the engagement between the rotational force transmitting member 7 and the transmitted member 8, the rotation of the casing 3 is transmitted to the Kelly bar 5, and the bucket 6 attached to the lower end thereof is rotated to perform excavation.

During this excavation, the casing 3 is raised to a higher height than the previously excavated area, so the rotation of the casing 3 causes the earth and sand to be removed.
Excavation can be carried out efficiently without any follow-up. Moreover, since the casing 3 is press-fitted while rotating or rocking, the casing 3 can be press-fitted even on hard ground.

In this way, the bucket 6 excavates, and when the bucket 6 is full, the winch 13 winds up the wire rope 14 and pulls up the digging tool 12.
After the collar 5a of the Kelly bar 5 comes into contact with the lower surface of the rectangular tube portion 8b of the rotational force transmitted member 8, the rotational force transmitted member 8 is separated from the transmission member 7 together with the Kelly bar 5, and then the bucket 6 is attached to the casing 3. or transmission member 7
After coming out of the container, the rotating device 17 of the working machine 4 is activated, and if necessary, the bucket 6 is lowered to an appropriate height and the soil is discharged.

By performing such excavation work one or more times, after excavating to the depth of the preliminary press-in of the casing 3, excavation with the bucket 6 is not performed (this means that
This is possible by stopping the winch 13 and keeping the bucket 6 at that height. ), the casing 3 is press-fitted in advance by rotating or swinging only the casing 3.
The casing 3 is built to the required depth by repeating such operations.

When pulling out the casing 3, remove the rotational force transmitting member 7 from the top of the casing 3, and with the casing 3 chucked by the band of the casing holding device 2d, move the thrust cylinder while rotating or swinging the casing holding device 2d. 2b is extended and the casing 3 is pushed up to pull it out.

Next, the second construction method according to the present invention will be explained with reference to FIG. This method is used in Figures 2 to 4.
This is a construction method that can be implemented using the equipment shown in the figure.
First, as shown in FIG. 5A, water 18 is filled in the casing 3 to create a water head difference (preferably a water head difference of 2 m or more) with respect to the groundwater level. Then, as shown in FIG. 5A, the excavator 12 is inserted into the casing 3, the bucket 6 is placed on the ground, and the transmitted member 8 is engaged with the rotational force transmitting member 7. When 3 is rotated in the same manner as above, the bucket 6 is rotated as described above.
is rotated and excavation is performed. At this time, the casing 3 is not press-fitted, but merely remains in that position and rotates, whereas the bucket 6 performs preliminary digging. In this case, since the hole wall is maintained with a water head difference of 2 m or more (water pressure difference of 0.2 kg/cm ² or more with respect to groundwater) as described above, collapse due to preliminary excavation will not occur. Also, similar to the above construction method,
Although the casing 3 rotates, since it rotates above the excavation location, there is no accompanying movement of earth and sand, allowing efficient excavation.

Next, as shown in FIG. 5B, the winch 13 is stopped and the casing 3 is rotated or rocked by the rotary drive device 2 so that the bucket 6 remains in that position and simply rotates. While moving, the thrust cylinder 2b is compressed to be press-fitted. The casing 3 is built by repeating such operations.

As described in Japanese Patent Application No. 60-154346, the construction method of the present invention described above is such that a protrusion for transmitting rotational force is vertically provided on the inner wall of the casing 3, and the bucket 6 receives the rotational force that comes into contact with the protrusion. Although it is possible to implement the configuration by forming a protrusion for transmission, by using the above-described device of the present invention, there is no need to provide a protrusion on the inner wall of the casing 3. This has the advantage of reducing resistance when rotating or press-fitting.

(Effects of the Invention) As described above, the construction method of the present invention does not require a special excavator, can be carried out at low cost, and the soil removal height can be set freely. This is a construction method in which vertical digging is performed while rotating the casing, and when excavating in the middle, the casing is placed above the excavation position. Even if the excavation is carried out, the entrainment of earth and sand by the casing is prevented, and the intermediate excavation can be carried out efficiently. Moreover, since the casing is built while rotating or swinging, it is also possible to build the casing on hard ground.

In addition, the second construction method of the present invention is a construction method in which water is filled in the casing and excavation is performed in advance while providing a water head difference with respect to groundwater, so collapse of the hole wall is prevented and the casing is smoothly constructed. be constructed efficiently.

In addition, the device according to the present invention does not provide a driving device for the excavating tool on the top of the casing, but merely provides a rotating force transmitting member with a simple configuration, so the device has a large weight and a large size. Compared to conventional equipment in which the casing is attached to the top of the casing, work safety is improved, and work efficiency is also improved because replacement work can be easily performed when adding casings. Further, since there are no hydraulic hoses or cables hanging down from the top of the casing, the working environment is simplified. Moreover, the device of the present invention
Since there is no need to provide a protrusion for transmitting rotational force on the inner wall of the casing, there is less resistance when the casing is erected while rotating or swinging.

[Brief explanation of drawings]

Figures 1A and B are partially sectional side views showing an embodiment of the first construction method of the present invention, and Figure 2 shows an entire embodiment of the apparatus used when carrying out the construction method of the present invention. 3 is an enlarged sectional view of FIG. 2, FIG. 4 is a perspective view showing the structure of the excavation tool and rotational force transmission device used in the present invention, and FIGS. FIG. 2 is a partially sectional side view of an embodiment of the construction method.

Claims (1)

[Claims] 1. After the casing is press-fitted while rotating or swinging, the casing is temporarily pulled up to the state before the pre-press-fitting, and the casing is rotated at that position, and at the same time, the rotational force of the casing is transmitted to the excavation tool. By rotating, the earth and sand in the area where the casing was previously press-fitted is excavated, the excavation tool is pulled out from the casing, the earth is removed on the ground, and the casing is repeatedly press-fitted again, and the casing is erected. A rotary press-fit construction method for large-diameter steel pipes that is characterized by the ability to 2. By transmitting the rotational force of the casing to the excavating tool for medium digging and rotating it, excavation is carried out in advance of the casing, and after excavating to a certain depth, the excavating tool is held in that position and the above-mentioned The casing is press-fitted while rotating or swinging to the depth of excavation by the excavation tool, and the casing is repeatedly excavated with the excavation tool in front of the casing, and the casing is filled with water to drain underground water. A rotary press-fit construction method for constructing large-diameter steel pipes, which is characterized by construction in such a way that there is always a difference in water head between positions. 3 Rotary excavation for medium digging consisting of a rotary press-fitting device for casing installed on the ground, a kelly bar rotatably suspended via a wire rope by a winch attached to the working machine, and a bucket for excavation attached to its lower end. a tool attached to the top of the casing and through which the excavation bucket can pass;
a ring-shaped rotational force transmission member that transmits the rotation of the casing to the excavation tool; and a plurality of engaging parts that are detachably engaged with the plurality of engaging parts arranged in the circumferential direction of the rotational force transmission member. 1. A rotary press-fit type large-diameter steel pipe erecting device comprising: a rotary press-fit type large-diameter steel pipe erecting device comprising: a rotational force transmitted member inserted through the kely bar so as to be vertically movable and non-rotatable relative to each other;