JP2014181470A - All-around rotation excavator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an all- around rotation excavator that can be installed even if the installation space at an excavation site is small, can work with a small crane, can be easily carried in/out, and further can be improved in working efficiency and machining accuracy.SOLUTION: An all-around rotation excavator includes: an excavator body 1 gripping an excavation casing and pressing the excavation casing into the ground by applying force to the excavation casing in the rotating and vertical directions; and a reaction force device 2 provided in the excavator body 1 and supporting the rotary reaction force and pushdown reaction force generated in the excavator body 1 when the excavation casing is pressed into the ground. The reaction force device 2 comprises a metallic weight 2', and the weight 2' is removably mounted in a lower surface of a base plate 3 positioned at the lowest place of the excavator body 1 through mounting means.

Description

  The present invention is used in an all-casing method for removing obstacles such as reinforced concrete structures buried in the ground and constructing cast-in-place piles, and press-fitting into the ground while rotating a casing for excavation. Related to an all-round rotary excavator, and a reaction force device that supports a rotational reaction force and a pushing reaction force generated in the excavator body when the excavating casing is pressed into the ground. By improving the equipment, it is possible to install even in a narrow installation space, work with a small crane, easily carry in and out, and improve work efficiency and processing accuracy. The present invention relates to an all-around rotary excavator.

  In recent years, with the redevelopment of cities and the aging of reinforced concrete structures, the rebuilding of structures has become frequent.

  By the way, when rebuilding this structure, in order to construct a pile according to the newly constructed structure, after removing obstacles such as reinforced concrete structures and existing piles buried in the ground, cast-in-place piles We are going to do the construction of.

  Conventionally, for removing obstacles buried in the ground and constructing cast-in-place piles, an all-casing method that can construct high-quality piles regardless of the properties of the ground has been used.

  In the all casing method, while rotating a cylindrical excavating casing and press-fitting into the ground, the earth and sand in the excavating casing is excavated and discharged with a hammer grab to excavate a vertical hole, and the vertical hole has a predetermined depth. After reaching the ground, after drilling the bottom of the hole, build a steel slab cage, drive concrete with treme, and pull out and collect the excavation casing and treme as the concrete is driven. is there.

  When this all-casing method is carried out, a considerable force is required to press-fit the excavation casing into the ground, and a stationary all-around rotary excavator is used to provide such a force.

That is, as shown in FIGS. 6 and 7, the all-round rotary excavator grips the excavation casing 20 and applies the rotational and vertical forces to the excavation casing 20 to bring the excavation casing 20 into the ground. An excavator body 21 that is press-fitted into the excavator body, and a reaction force device 22 that is provided in the excavator body 21 and supports the rotational reaction force and the push-in reaction force that are generated in the excavator body 21 when the excavating casing 20 is pressed into the ground. (For example, refer patent document 1 etc.).
If the excavator body 21 is large and heavy, the reaction device 22 is omitted, and the excavator body 21 performs excavation work.

  Such an all-round excavator is carried to a work site by a trailer or the like and installed at a drilling site by a crane. Further, when the force for supporting the reaction force transmitted from the excavating casing 20 is insufficient, the support force is increased by the reaction force device 22 using the weight type or the spike type or both.

  As shown in FIG. 6, a weight mounting frame 24 is connected to both sides of the excavator main body 21 by connecting pins 23, and a weight 25 is mounted on the upper surface of the weight mounting frame 24. A reaction force receiving frame 26 is attached to both sides of the excavator main body 21 as shown in FIG. 7, and a lower end portion is attached to the reaction force receiving frame 26. It is known that a reaction force receiver 28 having a plurality of piles 27 is fitted to the reaction force receiver 28 and a weight 25 is mounted on the reaction force receiver 28 so that the pile 27 of the reaction force receiver 28 penetrates into the ground.

However, as shown in FIGS. 6 and 7, the all-round rotary excavator provided with the reaction force device 22 is attached to both sides of the excavator body 21 with the reaction force device 22 protruding outward. In order to install the all-around rotary excavator, a large space is required, and when the space at the excavation site is small, there is a problem that the all-round rotary excavator cannot be installed.
Moreover, since the reaction force device 22 is attached to both sides of the excavator main body 21, a large-sized rotary excavator is brought into the work site or when the full-circular rotary excavator is removed from the work site. A crane and a trailer were required, and there was a problem that handling and workability were poor.

JP 2002-2425756 A

  The present invention has been made in view of such problems, and its purpose is to improve the reaction force device so that it can be installed even in a small installation space, and a small-sized It is an object of the present invention to provide an all-round rotary excavator that can be operated with a crane, can be easily carried in and out, and can improve work efficiency and processing accuracy.

  In order to achieve the above-mentioned object, the invention according to claim 1 of the present invention is an excavation in which an excavation casing is gripped, and the excavation casing is press-fitted into the ground by applying a force in a rotational direction and a vertical direction to the excavation casing. An all-round rotary excavator provided with a machine main body and a reaction force device that is provided in the excavator main body and supports a rotational reaction force and a pushing reaction force generated in the excavator main body when the excavation casing is pressed into the ground. The reaction force device is composed of a metal weight, and the weight is detachably attached to the lower surface of the base plate located at the lowest position of the excavator body via an attachment means.

  The invention according to claim 2 of the present invention is the invention according to claim 1, wherein the weight is formed in a plate shape having a thickness in which the planar shape exhibits the same shape as the base plate of the excavator body, A casing insertion hole through which the excavating casing is inserted is formed in the center of the weight, and a level cylinder that is provided in the excavator main body and adjusts the level of the excavator main body at the outer peripheral edge of the weight. It is characterized in that a plurality of openings through which the board can pass are formed.

  According to a third aspect of the present invention, in the invention according to the first or second aspect, the attachment means is embedded in and fixed to the upper surface of the weight, and has a plurality of shaft-like shapes in which a female screw is formed at the center. It is characterized by comprising a mounting boss and a plurality of connecting bolts inserted through the base plate of the excavator main body from the upper surface side and removably screwed into the female screw of the mounting boss.

In the all-round rotary excavator of the present invention, the weight, which is a reaction force device, is detachably attached to the lower surface of the base plate of the excavator main body by the attaching means. Therefore, even if the weight is attached to the excavator main body, the weight is excavated. Since it does not protrude outward from the main body, it can be reliably and satisfactorily installed even in a small installation location.
In particular, in the all-round rotary excavator of the present invention, the weight is formed in a thick plate shape having a planar shape similar to that of the base plate of the excavator body, so that the weight is outward from the excavator body. There is no overhang, and the effect appears more prominently.
Moreover, the all-round rotary excavator of the present invention forms a casing insertion hole through which the casing for excavation is inserted at the center of the weight, and supports the level cylinder that adjusts the level of the excavator body at the outer peripheral edge of the weight. Since a plurality of openings through which the board can pass are formed, even if a weight is attached to the lower surface of the excavator body, the weight does not get in the way and excavation work can be performed smoothly and satisfactorily.

  In addition, since the all-round rotary excavator of the present invention has a weight attached directly below the excavator body, the center of gravity is lowered and the stability is increased, and as a result, the processing accuracy of excavation work is also improved.

  Furthermore, since the all-round rotary excavator of the present invention has a weight attached to the excavator body, even if the excavator body is about 15 tons in weight, the pushing force is increased, and the efficiency of excavation work can be improved. it can.

  Furthermore, since the all-round rotary excavator of the present invention has a weight detachably attached to the excavator main body, the full-circular rotary excavator can be divided into an excavator main body and a weight. Installation and removal of the machine can be performed with a small crane, and the handling and workability are excellent.

  Furthermore, since the all-round rotary excavator of the present invention can be divided into an excavator main body and a weight, what is normally carried in and out by a trailer can be carried in and out by a large vehicle and is relatively narrow. Can be transported on the road.

  Further, in the all-round rotary excavator of the present invention, the attachment means for attaching the weight to the excavator main body is inserted from the upper surface side into the mounting boss formed with a female screw embedded and fixed on the upper surface of the weight, and the base plate of the excavator main body. And a connecting bolt that is removably screwed to the female screw of the mounting boss. When attaching a weight to the excavator body or removing a weight from the excavator body, the connecting bolt is used. It is only necessary to perform the rotation operation, and the weight can be easily attached to and detached from the excavator body, and the work efficiency can be improved.

1 is a front view of an all-around rotary excavator according to an embodiment of the present invention. Similarly, it is a partially omitted plan view of the all-around rotary excavator. It is a top view of the weight which is a reaction force apparatus. It is an expanded vertical sectional view of the principal part of the state which attached the weight to the lower surface of the base plate of the excavator main body by the attachment means. It is a front view which shows the state which press-fits the casing for excavation in the ground using an all-around rotary excavator. It is a schematic front view which shows an example of the conventional all-around rotary excavator. It is a schematic front view which shows the other example of the conventional all-around rotary excavator.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 and 2 show an all-round rotary excavator according to an embodiment of the present invention. The all-round rotary excavator removes obstacles such as reinforced concrete structures buried in the ground and casts in place. Excavator that is used in an all-casing method for carrying out construction, etc., and holds the excavating casing 13 and presses the excavating casing 13 into the ground by applying rotational and vertical forces to the excavating casing 13 A main body 1 and a reaction force device 2 that is detachably attached to the lower surface side of the excavator main body 1 and supports a rotational reaction force and a pushing reaction force generated in the excavator main body 1 when the excavating casing 13 is press-fitted into the ground; It has.

  As shown in FIG. 5, the excavating casing 13 includes a cylindrical tip casing 13a having a plurality of excavating bits at the lower end, and a plurality of cylindrical additions sequentially connected to the upper end of the tip casing 13a. Casing 13b.

  As shown in FIGS. 1 and 2, the excavator body 1 includes a base plate 3 in a horizontal posture, an elevating drive device 4 that is erected on the base plate 3 and includes a plurality of hydraulic cylinders 4 a, and a position above the base plate 3. The elevating frame 5 supported by the plurality of hydraulic cylinders 4a of the elevating drive device 4 in a horizontal posture and elevating and lowering by the elevating drive device 4, the rotating frame 6 rotatably supported by the elevating frame 5, and the rotating frame 6 A main chuck device 7 provided with a plurality of clamp claws 7a and a clamp cylinder 7b for holding the excavating casing 13 and a plurality of hydraulic motors 8a and a gear speed reducer provided on the elevating frame 5 for rotating the rotary frame 6. When there is a rotary drive device 8 composed of a device 8b and support plates 9a provided at the four corners of the base plate 3 and grounded to the ground. In addition, a plurality of level cylinders 9 for adjusting the level of the excavator body 1 and a sub chuck device (not shown) that is provided on the base plate 3 and grips the excavation casing 13 when the main chuck device 7 releases the excavation casing 13. ) And a work table 10 provided on the elevating frame 5 above the rotating frame 6 and having the same structure as a conventionally known one.

  The base plate 3 is formed of a steel plate in a rectangular shape, and a casing insertion hole 3a through which the excavating casing 13 is inserted is formed at the center of the base plate 3, and levels are formed at the four corners of the base plate 3. A plurality of openings 3b through which the support plate 9a of the cylinder 9 can pass are formed.

On the other hand, the reaction force device 2 is made of a metal weight 2 ′, and the weight 2 ′ is detachably attached to the lower surface of the base plate 3 of the excavator body 1 through attachment means described later.
As shown in FIG. 3, the weight 2 ′ is formed of a thick rectangular plate having a plane shape similar to that of the base plate 3 of the excavator main body 1 by an iron material, and the central portion of the weight 2 ′. Are formed with casing insertion holes 2a through which the excavation casing 13 is inserted so as to match the casing insertion holes 3a of the base plate 3, and at the four corners of the weights 2 'to match the openings 3b of the base plate 3. A plurality of openings 2b through which the support plate 9a of the cylinder 9 can pass are formed.

Here, the thick plate refers to a plate formed to have a thickness sufficient to support the rotational reaction force and the pushing reaction force generated when the excavating casing 13 is pressed into the ground.
The weight 2 'is set so as to support the rotational reaction force and the pushing reaction force generated in the excavator body 1 when the excavating casing 13 is pressed into the ground. It is determined by sheath pressure input.

In this embodiment, the excavator body 1 has a mass of 14 ton, a pressure input of 1440.6 kN, a pulling force of 2363.7 kN, and a rotational torque (first speed, second speed, third speed, fourth speed) of 1170. .6 kN · m, 877.4 kN · m, 585.0 kN · m, 438.7 kN · m, and the rotation speed (first speed, second speed, third speed, fourth speed) is 0.91 min ⁻¹ , 1.21 min ⁻² , 1.82 min ⁻¹ , 2.42 min ⁻¹ , and the excavator body 1 having a clamping force of the excavating casing 13 of 5005 kN is used.
As the weight 2 ', an iron weight 2' having a length of 3700 mm, a width of 2000 mm, a thickness of 250 mm, and a weight of 10 tons is used.

As shown in FIGS. 3 and 4, the attachment means for attaching the weight 2 'to the base plate 3 of the excavator body 1 is provided on the upper surface of the weight 2' so that the upper end surface is flush with the upper surface of the weight 2 '. A plurality of shaft-like mounting bosses 11 that are embedded and fixed and formed with a female screw at the center, and bolt insertion holes 3 c formed in the base plate 3 of the excavator body 1 are inserted from the upper surface side. It comprises a plurality of connecting bolts 12 which are detachably screwed to the female screw.
In this embodiment, eight mounting bosses 11 are used and fixed to the weight 2 'by welding. Also, the plurality of mounting bosses 11 attached to the weight 2 ′ are respectively matched with the plurality of bolt insertion holes 3 c formed in the base plate 3.

  Thus, the all-round rotary excavator described above is carried into the work site by car in a state where the excavator main body 1 and the weight 2 'which is the reaction force device 2 are divided.

At this time, since the all-round rotary excavator is divided into the excavator main body 1 and the weight 2 ′, it can be carried in (or carried out) with a large vehicle without using a trailer, and can be carried on a relatively narrow road. can do.
In addition, loading into a large vehicle can be performed with a small crane, and the handling and workability are excellent.

  When the all-round excavator is carried into the work site, the excavator body 1 and the weight 2 'are lowered from the large vehicle using a crane.

  Also at this time, since the all-round rotary excavator is divided into the excavator main body 1 and the weight 2 ', it can be lowered by a small crane, and the handling and workability are excellent.

When the all-round rotary excavator is lowered to the work site, the all-round rotary excavator is installed at the excavation site.
First, the weight 2 'is installed at the excavation site with a crane, and then the base plate 3 of the excavator body 1 is placed on the upper surface of the weight 2' using the crane, and each bolt insertion hole 3c of the base plate 3 is inserted into the weight 2 '. Then, the connecting bolts 12 are respectively inserted into the bolt insertion holes 3 c of the base plate 3 and screwed into the mounting bosses 11. As a result, the weight 2 ′ is attached and fixed to the lower surface of the base plate 3 of the excavator body 1.

At this time, the weight 2 ′ can be attached to the base plate 3 of the excavator body 1 simply by rotating the connecting bolt 12, and the weight 2 ′ can be easily and easily attached to the excavator body 1. Can be improved.
Further, since the weight 2 'does not protrude outward from the excavator body 1, the all-round rotary excavator can be reliably and satisfactorily installed even in a small installation location.

When the all-round rotary excavator is installed at the excavation site, the lifting frame 5 is lifted by the lifting drive device 4, and the excavation casing 13 is gripped by the main chuck device 7 at this position. While moving the rotating frame 6, the lifting frame 5 is lowered by the lifting drive device 4 and the casing 13 for excavation is rotationally pressed into the ground.
Further, the earth and sand in the excavation casing 13 that is rotationally pressed into the ground by the hammer grab suspended from the crane is excavated and discharged to form vertical holes having the same diameter as the excavation casing 13.

At this time, since the weight 2 ′ is attached to the excavator main body 1, even if the excavator main body 1 is lightweight, the pushing force increases, and the efficiency of excavation work can be improved.
In addition, since the weight 2 'is attached directly below the excavator body 1, the center of gravity is lowered and the stability is increased. As a result, the processing accuracy of excavation work is also improved.

  When the excavating casing 13 is pressed into the ground to a predetermined depth, the excavating casing 13 is rotationally pressed into the ground while continuing to connect the additional casing 13b, and the earth and sand in the excavating casing 13 is hammered. Excavate and remove the soil.

  When a vertical hole having a predetermined depth is formed, after performing hole bottom processing, a rebar cage is built in the excavation casing 13, concrete is driven by treme, and the excavation casing 13 and Build a stake by pulling out and collecting the treme.

  As described above, the all-round rotary excavator described above has a structure in which the reaction force device 2 including the weight 2 'is detachably attached to the lower surface of the base plate 3 of the excavator body 1, so that the excavation site is a small installation space. Can be installed, and can be operated with a small crane, can be easily carried in and out, and can further improve work efficiency and processing accuracy.

  In the above embodiment, the weight 2 'is a rectangular plate having a thickness. However, the shape of the weight 2' is not limited to the above embodiment, and the weight 2 'is not formed on the lower surface of the base plate 3. Any shape may be used as long as it can support the rotational reaction force and the pushing reaction force generated in the excavator body 1 when the excavating casing 13 is press-fitted into the ground.

  Further, in the above embodiment, the attachment means is constituted by the attachment boss 11 and the connecting bolt 12. However, the structure of the attachment means is not limited to the above embodiment, and the base plate 3 Any structure can be used as long as the weight 2 'can be easily and easily attached to the lower surface.

  1 is an excavator body, 2 is a reaction force device, 2 'is a weight, 2a is a weight casing insertion hole, 2b is a weight opening, 3 is a base plate, 3a is a base plate casing insertion hole, 3b is a base plate opening, 3c Is a base plate bolt insertion hole, 4 is a lifting drive device, 4a is a hydraulic cylinder of the lifting drive device, 5 is a lifting frame, 6 is a rotating frame, 7 is a main chuck device, 7a is a clamp claw, 7b is a clamping cylinder, 8 Is a rotation drive device, 8a is a hydraulic motor, 8b is a gear reduction device, 9 is a level cylinder, 9a is a support board, 10 is a work table, 11 is a mounting boss, 12 is a connecting bolt, 13 is a casing for excavation, 13a Is a tip casing, and 13b is a casing for extension.

Claims (3)

  An excavator body (1) for holding the excavating casing (13) and pressurizing the excavating casing (13) into the ground by applying rotational and vertical forces to the excavating casing (13); A reaction force device (2) provided on the main body (1) and supporting a rotational reaction force and a pushing reaction force generated in the excavator main body (1) when the excavating casing (13) is pressed into the ground. In the circumferential rotary excavator, the reaction force device (2) is made of a metal weight (2 '), and the weight (2') is a base plate (3) positioned at the lowest position of the excavator body (1). An all-around rotary excavator characterized in that it is detachably attached to the lower surface via attachment means.   The weight (2 ') is formed in a thick plate shape having a planar shape similar to that of the base plate (3) of the excavator body (1). A casing insertion hole (2a) through which the excavating casing (13) is inserted is formed, and the outer peripheral edge of the weight (2 ') is provided on the excavator main body (1) to be provided on the excavator main body (1). 2. The all-around rotary excavator according to claim 1, wherein a plurality of openings (3 b) are formed through which the support plate (9 a) of the level cylinder (9) that adjusts the level of the plate can pass.   The attachment means is embedded on and fixed to the upper surface of the weight (2 '), and is attached to the base plate (3) of the plurality of shaft-like attachment bosses (11) having a female screw at the center and the excavator body (1). 3. The whole connecting bolt (12) according to claim 1, comprising a plurality of connecting bolts (12) inserted from the side and removably screwed into the female screw of the mounting boss (11). Circumferential excavator.

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