JP2806922B2 - How to remove rotational reaction force from a rotary casing driver - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a rotational reaction force relief method to be installed on a casing driver for pressing in and extracting casings for large diameter steel pipe piles or steel pipes used in foundation work in construction and civil engineering.

[0002]

2. Description of the Related Art A casing driver is used to press-fit and extract large-diameter steel pipe piles or steel pipe casings (hereinafter referred to as "casings") used in foundation work in construction and civil engineering. This casing driver generally comprises a band device that grips the casing, a rotating device that rotates the band device, and a thrust cylinder that raises and lowers the band device and the rotating device.

When the casing driver described above is pressed into or pulled out, a rotational force is applied to the casing by the rotation device, and a rotational reaction force acts on the main body of the casing driver. Methods for eliminating this rotational reaction force are described in Japanese Utility Model Application Laid-Open Publication Nos. 61-84738 and 61-84737.

[0004] The former known example (Japanese Utility Model Application Publication No. 61-84738) provides a reaction device that receives the swing reaction force generated by a swing pushing device that is equipped with a swing cylinder that swings the casing circumferentially and a pushing cylinder that pushes the casing into the ground, and specifically, an arm member that extends to the crawler frame, which serves as the reaction force support object, avoiding the tracks, and a hydraulic jack is attached vertically to the tip of the arm member, which presses against the base on the side of the swing pushing device, and the crawler frame receives the swing reaction force via the hydraulic jack and arm member that press against the base.

Furthermore, the latter known example (Japanese Utility Model Laid-Open Publication No. 61-847)
The former known example (Japanese Utility Model Application Publication No. 61-8473)
In a swinging pushing device similar to that in the case of the above-mentioned publication (Publication No. 8), which is equipped with a swinging cylinder that swings the casing in the circumferential direction and a pushing cylinder that pushes the casing into the ground, a bracket provided at the front center of the lower swivel base of the work machine and the swinging pushing device are connected by a roughly triangular frame and a link arm, and the swinging reaction force of the swinging pushing device is received by the work machine via this frame and link arm.

[0006]

In the above-mentioned prior art, the former known example uses a hydraulic jack at the tip of an arm member extending from the crawler frame of the work machine to press against a base mounted on the side of the swing pusher body, causing the arm member to protrude outward beyond the width of the swing pusher body. In the latter known example, the link arm and frame connecting the work machine and the swing pusher are pin-connected to a bracket mounted in the front center of the work machine's swivel base, so the work machine is positioned opposite one side of the swing pusher, causing a portion of the work machine to protrude outward beyond the width of the swing pusher body. For this reason, in both of the above-mentioned prior art, the swing reaction force take-up device must be substantially larger than the dimensions of the swing pusher body.

[0007] Furthermore, all of the above-mentioned known examples are structured so that the arm member or frame body and link arm for supporting the reaction force are directly connected to the working machine that supports the reaction force, so when moving the swinging pushing device during construction, the connection between them must be released and then the working machine and swinging pushing device must be moved, which takes time to move and makes it difficult to work.

Furthermore, in the former known example, the swing reaction force is received through the arm member, which causes the arm member to bend when the hydraulic jack presses against the base of the swing pushing device. This means that the arm member cannot be made very long, making it difficult to support a large swing reaction force. In the latter known example, the swing reaction force is received through the frame body and link arm, so for strength reasons the link arm and bracket connecting the frame body to the working machine tend to be large, making manual installation and removal very laborious. In addition, the link arm and bracket must be aligned when connecting them with a pin, which necessitates movement of the working machine and link arm, resulting in a problem of significantly reduced workability.

On the other hand, in recent years, with the rise in land prices, there has been an increasing demand to construct buildings and civil engineering structures as close to the allowable range of the site as possible. In this way, when building buildings and civil engineering structures as close to the allowable range of the site as possible, it is necessary to erect the casing that forms the foundation of the building or civil engineering structure underground as close to the allowable range of the site as possible.

However, in the above-mentioned prior art, it is not possible to erect the casing that forms the foundation of a building or civil engineering structure deep into the ground to the very limit of the allowable range of the construction site.
In both the former and latter known examples, the reaction force absorber, which absorbs the swing reaction force, protrudes beyond the width of the swing pushing device itself. Even if the swing pushing device is installed at the very edge of the construction site's allowable range, the casing erected by the swing pushing device must be positioned further inward from the construction site by the distance from the side edge of the swing pushing device itself to the center of the casing, plus the dimensions of the reaction force absorber. As a result, piles may need to be driven slightly off-center relative to the designed pile core position of the building or civil engineering structure. This results in piles that are eccentric relative to the column position of the building or civil engineering structure, which requires larger pile diameters or more piles. This impact is particularly significant when there are buildings around the construction site.

Furthermore, since the working machine that receives the reaction force is connected to the swing pushing device via an arm member or a frame and a link arm, the position where it is placed is easily limited.
There are cases where construction near the site boundary cannot be carried out due to limitations on the work equipment itself.

[0012] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a method for removing the rotational reaction force of a casing driver that can push the casing into the ground not only within the site but also right at the site boundary, and can also pull the casing out of the ground.

[0013]

[Means for solving the problem] In order to achieve the above object, the present invention, as defined in claim 1, is applied to a method for receiving the rotational reaction force generated by a rotary casing driver, in which the crawler of a work machine is abutted against the reaction force receiving portion of a beam that constitutes a rotational reaction force removal device provided on the casing driver, so that the rotational reaction force is received by the weight of the work machine.

[0014] The invention of claim 2 is applied to a method of receiving the rotational reaction force generated by a rotary casing driver, in which the crawler of the work machine abuts against the side of the reaction force receiving portion at the tip of the beam that constitutes the rotational reaction force removal device provided on the casing driver, so that the rotational reaction force is received by the weight of the work machine itself.

[0015] The invention of claim 3 is applied to a method of receiving the rotational reaction force generated by a rotary casing driver, in which the crawler of a work machine is abutted against the side opposite to the rotation direction of the casing driver of the reaction force receiving portion at the tip of the beam that constitutes the rotational reaction force removal device provided on the casing driver, so that the rotational reaction force is received by the weight of the work machine itself.

[0016] The invention of claim 4 is applied to a method of receiving the rotational reaction force generated by a rotary casing driver, in which the side of the crawler of the work machine is abutted against the fork-shaped reaction force receiving portion at the tip of the beam that constitutes the rotational reaction force removal device provided on the casing driver, and the rotational reaction force in the forward and reverse directions of the casing driver is received by the weight of the work machine itself.

[0017] The invention of claim 5 is applied to a method of receiving the rotational reaction force generated by a rotary casing driver, in which the sides of the crawlers of the work machine are abutted against the fork-shaped reaction force receiving portions at the ends of the beams that constitute the rotational reaction force removal device, which are arranged symmetrically on the casing driver, so that the rotational reaction force is received by the weight of the work machine itself.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will now be described in more detail with reference to the accompanying drawings.

[0019] Figure 1 is a front view of a casing driver to which a rotational reaction force remover used in the present invention is attached, and Figure 2 is a plan view thereof. In these figures, 1 denotes a casing,
Reference numeral 2 denotes a casing driver that presses in and pulls out the casing 1, 3 denotes a rotational reaction force removal device attached to the casing driver 2, and 4 denotes an internal excavator for excavating the soil and sand inside the casing 1, and the crawler 5 of this excavator 4 serves to support the rotational reaction force generated by the casing driver 2.

[0020] The casing driver 2 described above is composed of a base frame 7 which is adjusted to a horizontal position by a jack cylinder 6, guide posts 8 which are erected at the four corners of the base frame 7, a rotary drive unit 10 which is raised and lowered along the guide posts 8 by a thrust cylinder 9 which has one end attached to the base frame 7, and a band device 11 which is attached to the rotating side of the rotary drive unit 10.

[0021] As shown in Figure 1, the rotary drive device 10 is composed of an externally toothed slewing bearing 12, a pinion 13 that meshes with the external teeth of the slewing bearing 12 and rotates the slewing bearing 12, and a hydraulic motor 14 with a planetary reducer that drives the pinion 13.

The band device 11 is a swivel bearing 1
The rotor is fixed to the outer race of the rotor 2.
The band device 11 is adapted to chuck and release the casing 1 by means of a band cylinder 15 attached thereto.

The rotational reaction force remover 3 comprises a beam 19 of a long structure, one end of which is swingably attached to a bracket 16 provided on the base frame 7 by a vertical pin 17, the other end of which has a reaction force receiving part 18 that receives a rotational reaction force in one direction, and the other end of this beam 19 has a support 18 for supporting the reaction force.
The reaction force receiving bracket 21 is detachably attached by a pin 20 so as to face the cylinder 8, and the base end of the cylinder is attached to the base frame 7 by a pin 22.
3 and a hydraulic cylinder 25 for swinging the beam, the tip of which is connected to the beam 19 by a pin 24.

[0024] The reaction force receiving portion 18 and the reaction force receiving bracket 21 are configured so that one of the crawlers 5 of the excavator 4 can be inserted between them, forming a fork-shaped reaction force receiving portion.

The rotational reaction force compensation device 3 is disposed symmetrically with respect to the casing driver 2.

Next, a method of the present invention for receiving the rotational reaction force generated in the casing driver 2 by the above-mentioned rotational reaction force compensation device 3 will be described.

The casing 1 is chucked by the band device 11 .

Next, when the hydraulic motor 14 with planetary reducer attached to the rotary drive device 10 is driven, the pinion 1
The rotation of the bearing 12 causes the externally toothed slewing bearing 12 to rotate. This causes the band device 11 fixed on the outer race of the slewing bearing 12 to rotate. This rotation of the band device 11 causes the casing 1 to rotate.

In this state, when the thrust cylinder 9 is contracted, the rotary drive device 10 is guided by the guide post 8 and moves down, and the rotating casing 1 also moves down. This downward movement of the casing 1 causes the casing 1 to bite into the ground while rotating. At this time,
A rotational reaction force against the rotary excavation force of the casing 1 acts on the casing driver 2. This rotational reaction force is received by the rotational reaction force relief device 3.

In addition, in this casing driver,
The pushing reaction force of the casing 1 is received by the weight of the casing driver 2 itself, so that the casing driver does not need to be provided with a pushing reaction force receiving device.

A first method for receiving the above-mentioned rotational reaction force by the rotational reaction force compensation device 3 will now be described.

First, remove the pin 20 at the tip side that secures the reaction force receiving bracket 21 at the tip side of the beam 19 shown in Figure 2 to the reaction force receiving portion 18, and rotate the bracket 21 counterclockwise on the surface of Figure 2, using the other pin 20 as a fulcrum.

Next, in this state, the hydraulic cylinder 2
Extend the piston rod of 5 to connect the beam 19 to the pin 1.
2 around 7 as a fulcrum, and the side surface of the reaction force receiving portion 18 at the tip of the beam 19 is brought into contact with the side surface of the crawler 5. At this time, in order to prevent the side surface of the reaction force receiving portion 18 from damaging the side surface of the crawler 5, it is advisable to provide a block between the side surface of the reaction force receiving portion 18 and the side surface of the crawler 5.

[0034] Then, the reaction force receiving bracket 2
2, rotate the reaction force receiving bracket 2 clockwise, and then return it to its original position. Then, insert the pin 20 again.
1 is fixed to the reaction force receiving portion 18. At this time, in order to prevent the side surface of the reaction force receiving bracket 21 from damaging the side surface of the crawler 5,
It is advisable to provide a batten between the side of the crawler 5 and the side of the crawler 5.

In this state, as described above, when the casing driver 2 rotates and drives the casing 1 into the ground, a rotational reaction force corresponding to the rotational excavation force is generated in the casing driver 2. This rotational reaction force acting on the casing driver 2 is transmitted through the guide post 8 and the base frame 7 to the reaction force receiving portion 18 at the tip end of the beam 19 that constitutes the rotational reaction force compensation device 3,
The reaction force receiving portion 18 is moved in the direction of arrow A shown in FIG.
This movement of the reaction force receiving portion 18 in the direction of arrow A is received by the side surface of the crawler 5 of the excavator 4, as shown in FIG.

[0036] According to this method of removing the rotational reaction force, the beam 19 constituting the rotational reaction force removal device 3 extends outward from one side of the casing driver 2, and the point at which the rotational reaction force acts is located away from the center of the casing 1, so the tangential force at the point at which the rotational reaction force acts is reduced.
As a result, even with the frictional force between the excavator 4 and the ground due to its own weight,
2, if the movement of the reaction force receiving portion 18 in the direction of arrow A is received by, for example, the inner side surface of the crawler 5 of the excavator 4, it is not necessary to install the crawler 5 outside the construction site, and the casing driver 2 can be installed right at the boundary of the construction allowable range of the construction site. As a result, the casing can be pushed right at the boundary of the construction allowable range of the construction site, and the casing pushed right at the boundary of the construction allowable range of the construction site can also be pulled out from the ground.

Furthermore, since the beam 19 of the rotational reaction force compensater 3 is configured to be rotatable, the alignment work between the side surface of the reaction force receiving portion 18 of the rotational reaction force compensater 3 and the side surface of the crawler 5 of the excavator 4 is facilitated.
The work of installing the casing driver at the casing installation position and the work of abutting the rotational reaction force take-up device 3 against the reaction force support such as the crawler 5 of the excavator 4 can be carried out separately, thereby improving work efficiency.

[0038] Furthermore, since the crawler 5 of the excavator 4 is sandwiched between the reaction force receiving portion 18 and the reaction force receiving bracket 21, it can receive rotational reaction forces in both directions, not just one direction.

Furthermore, according to the method of this embodiment, the rotational reaction force acting on the crawler 5 of the excavator 4 from the rotational reaction force compensater 3 can be distributed to the two rotational reaction force compensaters 3, so that the beam 1 constituting the rotational reaction force compensater 3 can be easily
9 can be reduced in size, and the rotation reaction force compensation device 3
This allows for a more compact design, and also increases the reliability of the rotational reaction force removal work.

Next, a second method of removing the rotational reaction force according to the present invention will be described.

The second rotational reaction force removal method of the present invention is as follows:
The rotational reaction force compensation device 3 shown in Fig. 2 is configured as a fixed beam 19 that does not use a hydraulic cylinder 25, and performs the rotational reaction force compensation work. In this case, the fixed beam 19 is fixed at its base end to the base frame 7 of the casing driver 2 by a pin or the like, and at its tip end, as shown in Fig. 2, a reaction force receiving portion 1 is provided.
8 are integrally formed.

In this second rotational reaction force compensation method, the crawler 5 of the inner excavator 4 is brought into contact with the reaction force receiving portion 18 before the casing driver 2 rotates and bites the casing 1 into the ground.
The rotational reaction force acting on the shaft is then absorbed.

In this embodiment, as shown in FIG. 2, if the movement of the reaction force receiving portion 18 in the direction of the arrow A is received by, for example, the inner side surface of the crawler 4 of the excavator 4, then, as in the first rotational reaction force receiving method of the present invention described above,
There is no need to install the crawler 5 outside the construction site.
The casing driver 2 can be installed as close as possible to the boundary of the construction site's allowable construction range. As a result, the casing can be pushed in even to the very edge of the construction site's allowable construction range, and a casing pushed in near the boundary of the construction site's allowable construction range can also be pulled out from the ground. Furthermore, according to the method of this embodiment, the rotational reaction force remover 3 can be configured with a fixed beam 19, which reduces the number of components and simplifies maintenance.

[0044] It is also possible to abut the crawler 5 of the inner excavator 4 against a reaction force receiving bracket 21 formed at the tip of the beam 19 to receive the rotational reaction force acting on the casing driver 2, thereby making it possible to receive not only rotational reaction forces in one direction but also rotational reaction forces in both directions.

In the above-mentioned embodiments, the rotational reaction force compensater 3 is disposed symmetrically with respect to the casing driver 2, but it is also possible to provide the rotational reaction force compensater 3 on only one side of the casing driver 2. This is effective when the rotational reaction force is not so large and when the casing driver 2 must be installed in a corner of the site.

[0046] Furthermore, in each of the above-mentioned embodiments, in order to receive the rotational reaction force generated by the casing driver, it is preferable to receive the rotational reaction force acting in the opposite direction to the rotational direction of the casing, which acts on the reaction force receiving portion at the tip of the beam that constitutes the rotational reaction force removal device provided on the casing driver, by abutting the reaction force receiving portion against the crawler of the work machine.

[0047]

As described above, the present invention provides the following advantages:
According to the above-mentioned items 1 to 3, the rotational reaction force of the rotary casing driver is transmitted by the contact between the reaction force receiving portion and the crawler of the work machine.
Since the load can be received by the weight of the work machine via the beam, the rotational reaction force can be easily absorbed without the need for pin connections or other attachments, greatly improving workability. Moreover, there is no need to install the crawler outside the construction site, and the casing driver can be installed right at the boundary of the construction site's allowable construction range. As a result, the casing can be pushed right up to the boundary of the construction site's allowable construction range, and a casing pushed near the boundary of the construction site's allowable construction range can also be pulled out of the ground.

[0048] Furthermore, according to the invention of claim 4, in addition to the effects of the invention of claim 1 described above, the rotational reaction force is received by abutting the fork-shaped reaction force receiving portion against the side of the crawler of the work machine, making it possible to remove the rotational reaction force in a casing driver that rotates in both forward and reverse directions.

Furthermore, according to the fifth aspect of the present invention, the crawlers are brought into contact with the reaction force receiving portions at the ends of the beams symmetrically provided on the rotary casing driver, so that:
In addition to the effects of the invention of claim 1 described above, the rotational reaction force acting on the crawler of the excavator from the rotational reaction force compensater can be distributed to two rotational reaction force compensaters, so the dimensions of the beams constituting the rotational reaction force compensater can be reduced, and the rotational reaction force compensater can be made smaller.
Furthermore, the reliability of the rotational reaction force compensation work can be improved, and the rotational reaction force compensation device has been made smaller, so that the number of components is reduced and the maintenance thereof is simple.

[Brief explanation of the drawings]

FIG. 1 is a front view of a casing driver equipped with a rotational reaction force compensation device used in a rotational reaction force compensation method for a casing driver of the present invention.

2 is a plan view of the casing driver shown in FIG. 1;

[Explanation of symbols]

1: Casing 2: Casing driver 3: Rotational reaction force relief device 4: Excavator 5: Crawler 18: Reaction force receiving part 19: Beam 21: Bracket 25: Hydraulic cylinder

Claims (5)

(57) [Claims] [Claim 1] A method for receiving a rotational reaction force generated by a rotary casing driver, characterized in that the crawler of a work machine abuts against the reaction force receiving portion of a beam that constitutes a rotational reaction force removal device provided on the casing driver, so that the rotational reaction force is received by the weight of the work machine. [Claim 2] A method for receiving a rotational reaction force generated by a rotary casing driver, characterized in that the crawler of a work machine is abutted against the side of a reaction force receiving portion at the tip of a beam that constitutes a rotational reaction force removal device provided on the casing driver, so that the rotational reaction force is received by the weight of the work machine. [Claim 3] A method for receiving a rotational reaction force generated by a rotary casing driver, characterized in that a crawler of a work machine is abutted against the side opposite to the rotation direction of the casing driver of a reaction force receiving portion at the tip of a beam that constitutes a rotational reaction force removal device provided on the casing driver, so that the rotational reaction force is received by the weight of the work machine. [Claim 4] A method for receiving a rotational reaction force generated by a rotary casing driver, characterized in that the side of the crawler of a work machine is abutted against a fork-shaped reaction force receiving portion at the tip of a beam that constitutes a rotational reaction force removal device provided on the casing driver, and the rotational reaction force in the forward and reverse directions of the casing driver is received by the weight of the work machine. [Claim 5] A method for receiving a rotational reaction force generated by a rotary casing driver, characterized in that the crawlers of the work machine are abutted against each of the fork-shaped reaction force receiving portions at the tip of the beam that constitutes a rotational reaction force removal device installed symmetrically on the casing driver, so that the rotational reaction force is received by the weight of the work machine.