JP2000080876A - Rotary reaction force supporting device for boring method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the construction efficiency of an excavating device having an inner rod inserted in an outer casing and to excavate a hole as designed so that it is good in straightness with no hole curving, by imparting rotary action also to the inner rod at the initial stage of hole excavation and surely supporting rotary reaction force on the outer casing. SOLUTION: Reaction plates are secured to both sides of the outer casing of an excavating device along its longitudinal direction and a guide frame is driven into the ground via a pile and fixed in position. Cutouts 20 for bringing a pair of reaction arms 18, 18 into engagement with the reaction plates of the outer casing are cut in the beams of the guide frame, so that even if vibrational impact and rotation are imparted to an inner rod from the initial stage of construction work, the rotary reaction force of the inner rod can surely be supported by the outer casing even at the first stage of construction work.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The disclosed technology relates to a device for reliably supporting a reaction force of a rotation of a drilling rig when the drilling rig is rotated in a rotary drilling in a soil improvement work or a work of constructing a pile body in the ground. Belongs to the technical field of construction.

[0002]

2. Description of the Related Art As is well known, in Japan, which has many mountainous forest areas and special terrain conditions approaching a long and intricate coastline, various industrial facilities and residential areas as well as agricultural and livestock farming are used. The available plains are extremely narrow, so various facilities are built nationwide, regardless of whether they are in urban or rural areas, and roads and railway networks are laid in networks throughout the country. When constructing such structures, railways, roads, etc., there are not a few cases of increasing the strength of the ground, constructing piles in the ground, and constructing piers of bridges, etc. Construction is often difficult due to complicated terrain conditions with many parts, and it is sometimes dangerous, and the construction period is long and costly. There was a door.

[0003] In particular, in the excavation work during the pile driving process in the mountainous forest area as described above, a construction road that allows free movement of the heavy construction machine by the self-propelled movement to the vicinity of the pile core cannot be attached. Yes, and therefore, inevitably a plane separation and height difference between the construction base surface of the pile core position and the heavy equipment scaffold will occur, so it will be extremely difficult to access the construction base surface in all processes during construction. Not only that, but also due to the fundamental construction restriction that the excavator must be set at the center of the pile due to the separation and the height difference and suspended by heavy equipment, excavation that uses rotational force as the driving force for excavation work There has been a drawback that it is extremely difficult to secure the rotational reaction force of the device.

In order to cope with this, as shown in FIG. 9, for example, as shown in Japanese Patent Application Laid-Open No. Hei 7-166785, a river 1 and the like cannot be crossed by a heavy machine 2 such as a construction trolley. When a pier or the like for a bridge is to be constructed at a predetermined site 3, a boom 4 is extended from a heavy machine 2 such as a construction bogie when a perforation must be excavated at the site 3, and an excavator is inserted from the tip of the boom 4. 5 is attached to the tip of an inner rod 9 fixed to a drive device 8 for vertically impacting vibration in a sleeve type outer casing 7 provided in a lower part in association with a rotary drive device 6 of the excavator 5. A technology has been developed in which a drill bit 10 is provided to perform a predetermined drill.

[0005] In the drilling technique, when performing drilling and digging, first, the inner rod 7 is digged up to a predetermined depth via a driving device 8 having a vertical depth, that is, the inner rod 9 is initially drilled with respect to the inner rod 9. Excavates only by vertical vibration without applying rotation.
Outer casing 7 having a diameter slightly smaller than the diameter of
Is settled by its own weight in the hole formed by the bit 10, and then the inner rod 9 in the outer casing 7 is also rotated to impart a rotational force and a vertical vibration action to the inner rod 9, thereby forming a predetermined hole. I was trying to do it.

However, in the conventional technology,
In the early stage of drilling, rotation is not given only by vertical vibration by the inner rod 9, but it takes a long time for drilling and drilling up to that time to perform drilling, it takes a long time period, and the construction efficiency is poor. In addition, during the drilling, during the final stage, the inner rod 9 is rotated to continue the drilling, but the rotation reaction force of the inner rod 9 is increased. Has a drawback that the predetermined depth of the outer casing 7 supporting the rim cannot be known unless rotation is applied. In addition, when there is no supporting reaction force, the straightness of the perforation is not performed as designed, and a so-called hole bending phenomenon occurs. And it is difficult to maintain the straightness as designed.

[0007] Therefore, there is a disadvantage that the drilling work in such an embodiment is performed only in a place where the terrain condition is extremely limited.

It has been found that such a problem is due to the fact that the rotation reaction force cannot be reliably supported when imparting a rotating action to the inner rod 9 of the drilling apparatus.

[0009]

SUMMARY OF THE INVENTION It is an object of the invention of this application to support a rotation reaction force in imparting rotation to an inner rod in order to maintain the straightness of a drilling rig in ground improvement work and bridge pier construction based on the above-mentioned prior art. Is a technical problem to solve the problem that can not be sufficiently held from the beginning of construction, and as long as there is a place where the excavation driving device is carried in and set in place, the inner structure from the beginning of construction is very simple despite the extremely simple device structure The rotation reaction force support of the outer casing with respect to the rotation of the inner rod at the time of the rotation drilling of the rod can be reliably achieved,
An object of the present invention is to provide an excellent rotary reaction force support device for a drilling method which can sufficiently perform drilling as designed from an early stage and which is useful in the field of civil engineering in the construction industry.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the structure of the invention of the present application for solving the above-mentioned problem is to rotate an inner rod having a cutting bit mounted at the tip thereof. In a rotary reaction force support device connected to the device and used in a drilling method for performing excavation using the rotational force of the rotary drive device, an outer surface of an outer casing attached to an outer periphery of an inner rod by being linked to the rotary drive device The reaction force plate is fixed to the base plate, and the reaction force plate is engaged with the reaction force arm fixed to the guide frame for securing the drilling center installed on the ground to be drilled, thereby securing the reaction force of the rotary drive device. And the outer casing is fixedly connected to the rotary drive, and the outer casing and the rotary drive are not fixedly connected. The reaction plate fixed to the rotary drive unit may be engaged with the reaction plate fixed to the outer casing by interfering with the rotation direction of the inner rod. The reaction arm is disposed on the guide frame so as to be freely changeable, and a notch is formed in a steel material forming the reaction force plate so that the reaction force arm can be engaged with the reaction arm. In addition, technical measures are taken such that the guide frame is fixed to a pile driven into the ground.

[0011]

In the above construction, in order to construct a bridge pier or the like on the opposite bank of a river or the like, a frame-shaped guide frame made of H-shaped steel or the like is loaded and set in a predetermined position through a boom of a heavy machine such as a construction bogie. Similarly, the guide frame is attached to at least two places of the guide frame via a vertical vibration device of an inner rod which is similarly fixed with a pile made of H-shaped steel and suspended by a boom such as a heavy machine such as a construction trolley. A pile is penetrated into the ground of the part and fixed to the ground, and at this time, a pair of reaction force arms fixed in advance to a predetermined part of the guide frame via a span equivalent to the diameter of the outer casing are opposed to each other. The notch is recessed, and the excavator is loaded and set on a guide frame via a boom of a heavy machine such as a construction trolley, and a reaction force plate provided for both rules of an outer casing of the excavator is used to make a pile core frame. Guided and engaged with the notch recessed in the reaction force arm fixedly installed in the excavator, imparting a rotating action to the inner rod in the outer casing from the initial stage of construction by the rotary drive device provided on the upper part of the excavator, Further, the inner rod is also subjected to vertical vibration by a vertical vibration applying device to pierce through the excavating action on the ground, and at this time, the rotational reaction force of the inner rod with respect to the outer casing is fixed to a side portion of the outer casing. Even when the reaction force plate is fixedly mounted on the rotary drive device and when the reaction force plate interferes with the reaction force plate of the rotary drive device, the concave portion of the reaction force arm fixed on the guide frame. Rotational reaction force is supported from the initial stage of construction by the notch provided, straight excavation is performed as designed in a stable state, drilling with high precision without hole bending etc. is performed, and After the drilling, the drilling equipment is lifted and removed via a boom of a heavy machine such as a construction trolley, and the guide frame is also removed via the boom together with the pile and the reaction arm. And
In the case where the drilling excavation is performed at a small pitch in the horizontal direction, the reaction force arm is laterally moved with respect to the guide frame and fixed at the predetermined pitch. .

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following is a description of an embodiment of the present invention as an embodiment of the present invention, with reference to FIGS. 1 to 7. FIG.

The same parts as those in FIG. 8 will be described using the same reference numerals.

In the embodiment shown in FIGS. 1 and 2, the outer casing 7 is similar to the outer casing 7 in the embodiment shown in FIGS.

In the illustrated embodiment, the outer casing 7 is fixedly connected to the upper rotary drive device 6 via bolts 11 so that the outer casing 7 cannot rotate relative thereto.
As another embodiment, there is a design in which the rotary drive device 6 is not fixedly connected.

In the illustrated embodiment, a steel reaction force plate 1 having a predetermined width is provided on both opposing side surfaces of the outer casing 7 from directly below the rotary driving device 6 to the tip thereof.
2, 12 are fixed via welding or bolts.

Therefore, as another embodiment, FIG.

【I】,

As shown in [b], the reaction force hook 1 is also provided on the rotation drive device 6 side.
2 'is provided to provide a double reaction plate 12, a reaction force hook 1
2 'can also engage with each other in an interfering manner.

Depending on the design, the reaction force plate 12
Is not a pair but may be one or three or more.

These are merely design changes for those skilled in the art.

On the other hand, the guide frame 13 constituting the main body of the rotary reaction force supporting device has a structure as shown in FIGS. 4 to 7, and a pair of beams 14 and 14 of a predetermined length made of H-shaped steel.
At the ends of the beams 14, 14, H-shaped steel reinforcing members 15, 15 are integrally fixed by welding or the like to maintain the rigidity and strength of the guide frame 13.

In the longitudinal direction of the two beams 14, 14 of the guide frame 13, a pair of H-shaped steel piles 17, 17 are opposed to the reinforcing members 15, 15 so that a pair of base ends thereof are opposed to each other. It is welded to the outer surface of the beam 14 and integrated.

A pair of reaction force arms 18, 18 are fixed to and detachable from the beams 14 via a span substantially equal to the diameter of the outer casing 7 in the longitudinal direction by bolts (not shown). It is fixed so that the mounting position can be changed while keeping the span in the longitudinal direction.

As shown in FIG. 6, the reaction arms 18, 18 are formed integrally with flanges 19, 19 at both ends of the web, similarly to a general H-shaped steel, and opposed to the inside of the flanges 19, 19. In the middle of the outer casing 7
A notch 20 for guiding and engaging each reaction force plate 12 is recessed.

It is also possible to provide a notch in the beam 14 itself as a design change.

In the above-described configuration, when a perforation for constructing a bridge pier or the like is constructed in the ground 3 at the construction site on the opposite bank across the river 1 as in the conventional mode shown in FIG. The guide frame 13 is suspended from the tip of a boom 4 extending from the heavy equipment 2 such as a set construction trolley or the like, and is carried into the ground 3 at the predetermined site and set.
7 and 17 penetrate into the ground 16 at a predetermined depth via a pile driver such as a vibro hammer, and fix the guide frame 13 on the ground in the loading set posture.

In this case, when this state is completed, the reaction force arms 18, 18
4 and 14 are positioned and fixed at a predetermined portion near one end.

Next, the excavator 5 is also suspended and carried in via the tip of the boom 4 of a heavy machine such as a construction trolley, and is fixed to the guide frame 13 via the tip bit 10 of the inner rod 9 via the vertical vibration device 8. The reaction force arms 18, 18, which are positioned and fixed with the inner rod 9 in the outer casing 7 of the excavator 5 and the bit 10 fixed to the end of the inner rod 9 first with the outer casing 7 extended over the guide frame 13. The reaction force plates 12, 12 fixed on both sides of the outer casing 7 are centered and engaged with the notches 20 formed in the flanges 19 of the reaction force arm 18. As shown in FIGS.
When the rotary drive device 6 is rotated in the state of being guided and engaged, the rotary drive device 6 immediately rotates the inner rod 9, but the outer casing 7 is provided with a reaction plate fixed to both rules. Reaction force arms 18 fixed to both beams 14 of the guide frame 13 by
18, no rotation is given by the notches 20, 20, so that only the inner rod 9 is given a rotating action, and together with the vertical vibration device 8, the inner rod 9 is rotated.
Is provided with both a striking action and a rotating action by vertical vibration from the initial construction. During this time, the rotational reaction force of the inner rod 9 is supported by the non-rotating outer casing 7 and goes straight as designed without causing so-called hole bending or the like. Drilling is performed with the nature.

It should be noted that FIG.

【I】,

In another embodiment shown in (b), the outer casing 7 is not fixedly connected to the rotary drive 6, but the reaction force hook 12 'provided on the rotary drive 6 and the reaction force of the outer casing 7 are provided. The plate 12 can engage interferometrically to support the rotational reaction force as described above.

Thus, in this process, in the conventional mode shown in FIG.
Is applied only to the vertical vibration hitting action on the inner rod 9 and no rotation action is applied, so that the rotation driving apparatus 6 applies the rotation action to the inner rod 9 after the settlement by the initial settling action of the outer casing 7. In this case, the inner rod 9 is provided with both a vertical vibration striking action and a rotating action from the initial stage of construction. The rotation reaction force of the inner rod 9 is supported by the outer casing 7. The outer casing 7 is restrained by the reaction force plate 12 engaging with the notches 20 of the reaction force arms 18 of the guide frame 13. Drilling and drilling from the initial stage of drilling without bending, maintaining straightness as designed and accurate Engineering is made.

Therefore, as shown in FIG.
Since the predetermined depth for supporting the rotational reaction force cannot be known without rotating the inner rod 9 from the initial stage of construction.
The rotational reaction force is supported by the outer casing 7 and the excavation and drilling is performed while maintaining the designed straightness.

At this time, the guide frame 13 is
The guide frame 13 in a fixed state because it is firmly fixed to the ground 16 through
The outer casing 7 is absorbed by the notch 20, 20 of the outer casing 7 by the notch 20, 20 via the reaction force plate 12, and then the outer casing 7
And the rotational drive device 6 are in a state of maintaining a static fixed relationship via the bolt 11.

Even if the outer casing 7 and the rotary drive unit 6 are not connected and fixed, a substantially static fixed relationship is established during operation due to the interference engagement of the two reaction force plates. Is maintained.

Therefore, when the rotation driving device 6 is rotating, the rotation is not transmitted to the outer casing 7 but is developed only in the inner rod 9, and the inner rod 9 is subjected to the vertical vibration impact by the vertical vibration device 8. Due to the rotating action of the rotary drive device 6, drilling and drilling with straightness without hole bending as designed is performed.

When the first excavation and drilling is completed, the excavator 5 is lifted up through the boom 4 and pulled out to perform excavation and drilling on the next adjacent part.
3 is moved to a position adjacent to the longitudinal direction of both beams 14 while maintaining the pitch between them, and fixed by bolting, and the excavator 5 is again moved by the boom 4 at a predetermined pitch. Excavation and drilling of the adjacent part is performed, and also in the excavation and drilling of the adjacent part, a vertical vibration impact action and a rotation action are imparted to the inner rod 9 from the initial stage of construction, and the rotational reaction force support for the outer casing 7 is performed. As described above, since the reaction force plate 12 absorbs the reaction force from the reaction force arms 18 through the notches 20 from the initial stage, the rotational reaction force of the inner rod 9 is reliably supported from the initial stage. The perforation does not swing so that the straightness is impaired by swinging in the rotational direction, that is, the hole bending phenomenon does not occur.

Therefore, even if vertical vibration impact and rotation are applied to the inner rod 9 from the initial stage of construction,
The rotational reaction force against the outer casing 7 is reliably supported and supported from the beginning, and the outer casing 7 is restrained from rotating by the guide frame 13 so that the rotation of the outer casing 7 itself is restricted and the rotation reaction of the inner rod 9 is restricted. Support for force can be reliably maintained.

If all the drilling and drilling work is performed, the guide frame 13 can be pulled out and removed by the boom 4 and appropriately disassembled and stored so that it can be used next time.

The embodiment of the present invention is not limited to the above-described embodiment, and various modes can be adopted, such as manufacturing a plurality of guide frames and arranging the guide frames side by side at a work site.

In terms of design change, the number of reaction force plates attached to the side of the outer casing 7 is not limited to two, but may be one.
The number of the notches 20 of the reaction arm 18 is not limited to two, and the number of the notches 20 of the reaction force arm 18 is not limited to two or one, and four sets of the piles 17 are fixed on both sides of the guide frame. Instead, one pair can be provided at one site, or only one set can be provided.

[0039]

As described above, according to the invention of this application, basically, predetermined drilling and drilling is performed by a drilling device having a bit at the tip of an inner rod interposed in the outer casing of the drilling device. Conventionally, in the initial stage of the construction, only the vertical vibration impact was applied to the inner rod, and the rotating action was not applied, and the drilling work was performed, so that the construction time was long, and the construction efficiency was poor. However, in the conventional mode, since the rotation is not applied to the inner rod in the initial stage of the construction (because the outer casing cannot support the rotation reaction force even if the inner rod is initially rotated), the construction efficiency is poor. Also, the predetermined depth at which the rotation reaction force caused by giving rotation to the inner rod through the outer casing is supported by the outer casing is determined. Not without Hakare timing of the rotary application to the inner rod, poor results in construction accuracy,
In addition, while the drilling and drilling is performed only by the vibrating impact action during this period, there is a defect that the drilling and drilling which impairs the straightness such as hole bending is performed and the construction accuracy is reduced. Even when the vibration impact action and the rotation action are simultaneously applied to the inner rod, the rotation reaction force due to the rotation applied to the inner rod can be immediately supported by the outer casing, so that the inner rod vibrates in the initial stage of construction as in the conventional mode. The timing of applying rotation only by giving an effect to the impact is eliminated.The troublesome work of measuring a predetermined depth is omitted, and an excellent effect is achieved in that the rotation is applied to the inner rod from the beginning and the drilling and drilling can be performed as designed. You.

Further, at least one reaction force plate is fixedly mounted on the side of the outer casing which is directly connected and fixed to the rotary drive device or is linked to the non-locking fixed state, so that the above-mentioned non-connection fixedly fixed plate is provided. Even in the state, the reaction plates provided on both the rotary drive device and the outer casing and the reaction hooks can be coherently linked to each other,
In addition, a guide frame facing the excavator is provided with a reaction force arm having a notch engaged with the reaction force plate, and is provided, and a pile is provided to fix the guide frame on the construction ground. Because the outer casing is restrained substantially statically even when the rotational reaction of the inner rod to the outer casing is transmitted from the beginning, the rotational reaction of the inner rod can be reliably performed. An excellent effect is achieved in that the excavation can be accurately performed without being bent and supported by the outer casing from the initial stage of construction.

Further, since the reaction force arm in the guide frame is detachably fixed by a bolt or the like so as to be displaceable in the longitudinal direction, when the drilling is performed adjacent to the guide frame at a predetermined pitch, the reaction force arm of the guide frame can be removed. By moving the reaction arm with respect to the beam while maintaining a predetermined span to change the mounting position, an excellent effect is obtained in that adjacent excavation drilling at a predetermined pitch can be efficiently performed.

Further, since the guide frame can be stably fixed to the ground on which the excavation and drilling is performed by the pile provided on the side surface, the rotation reaction force support of the outer casing with respect to the inner rod is ensured. An excellent effect is achieved.

[Brief description of the drawings]

FIG. 1 is a cutaway side view of an essential part of an excavator.

FIG. 2 is a partial sectional view of an embodiment of the outer casing with a reaction force plate.

FIG. 3 shows a state in which the outer casing and the rotation drive device are not connected to each other;

[I] is a perspective view of the whole,

[B] is a partial plan sectional view.

FIG. 4 is an overall schematic plan view of a guide frame.

FIG. 5 is a partial cross-sectional side view penetratingly installed in the ground.

FIG. 6 is a structural diagram of the reaction arm;

[C] is the side view,

[D] It is the same bottom view,

[E] FIG.

FIG. 7 is a plan view, partially in section, in which an outer casing faces a guide frame.

FIG. 8 is a partial sectional side view of the same.

FIG. 9 is a partial cross-sectional side view of drilling and digging work based on the prior art.

[Explanation of symbols]

 Reference Signs List 6 Rotation drive device 7 Outer casing 9 Inner rod 10 Drilling bit 5 Drilling device 12 Reaction force plate 12 'Reaction force hook 18 Reaction force arm 13 Guide frame 19 Flange 20 Notch 17 Pile

Claims (6)

[Claims] 1. A rotary reaction force support device used in a drilling method in which an inner rod having a drill bit attached to the tip thereof is connected to a rotary drive device to perform excavation using the rotary force of the rotary drive device. A reaction force plate is fixed to the outer surface of the outer casing attached to the outer periphery of the inner rod by linking to the inner rod, and the reaction force plate is fixed to a guide frame that secures a drilling center installed on the ground to be drilled. A rotary reaction force support device for a drilling method, wherein the device is engaged with a reaction force arm to secure the reaction force of the rotary drive device. 2. A rotary reaction force support device for a drilling method according to claim 1, wherein said outer casing is fixedly connected to a rotary drive device. 3. A reaction force hook fixedly mounted on the rotation drive device side to the reaction force plate fixedly mounted on the outer casing without fixedly connecting the outer casing and the rotation drive device to rotate the inner rod. The rotary reaction force support device for a drilling method according to claim 1, wherein the rotation reaction force support device is configured to be freely engageable in a direction. 4. The apparatus according to claim 1, wherein said reaction force arm is disposed on a guide frame so as to be capable of changing its position.
The rotary reaction force support device for a drilling method according to any one of claims 2 and 3. 5. A steel material constituting said reaction force plate, wherein a notch is formed in said reaction force arm so that said reaction force plate can be engaged with said steel plate. The rotary reaction force support device for the perforation method according to the above. 6. The method according to claim 1, wherein said guide frame is fixed to a pile driven into the ground.
The rotational reaction force support device for a drilling method according to any one of 4, 5 or 6.