JPH07158043A - Anchor-integral soil pile forming method for soft ground and device used for its method - Google Patents

Abstract

PURPOSE:To increase the tensile strength of a ground structure by forming a soil pile by compacting and simultaneously providing an anchor rod provided integrally with an anchor on the centerline of the soil pile. CONSTITUTION:While an earth auger 1 and an anchor 2 are rotated, a soft ground is excavated. After a specified depth is excavated, excavating is stopped, and the earth auger 1 is disengaged from an anchor rod 3. Also, while a compacting material such as sand, etc., is charged around the earth auger 1, the earth auger 1 is rotated reversely to compact the ground near the anchor 2, anchor rod 3, and earth auger 1. While the ground is compacted from the peripheral top of the anchor 2 in order, the earth auger 1 is raised and the whole excavating part is compacted to form a soil pile. In this case, the anchor 2 and anchor rod 3 are left in the soil pile.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the construction of a soil pile as the basis of a ground structure, and more particularly to the enhancement of the tensile force of a ground structure by a soil pile by the consolidation of soft ground and an apparatus therefor.

[0002]

2. Description of the Related Art Conventionally, the foundation of a pillar in a structure such as a utility pole, a transmission tower, or a small multi-story parking lot whose height is extremely high compared to a flat area, especially in a soft ground, Consolidate with a suger to form a soil pile. A foundation concrete (with or without rebar) is laid on the top of the pile, or it is laid without the foundation concrete, or a utility pole. In this case, the central portion of the soil pile was dug only by the length to bury the utility pole, and the pillar was built in that part. Further, as a basis of the building pillar, a means of driving a concrete pile with reinforcing bars and building a building pillar on the pile is also adopted. Of course, the concrete pile and the building are directly or indirectly connected to each other. Among the above construction methods, except for the method using concrete piles, even if the building has a bearing capacity (bearing capacity for load), the tensile strength against rolling of the building is weak. An anchor rod with an anchor is used as a branch line in Fig. 10 (Fig. 10) to prevent lodging due to strong winds and rolling of earthquakes. However, in the case of soft ground, the tensile strength of the branch line must be particularly strengthened. Therefore, in the case of a screw type anchor, the number of screws is increased, and in the case of a driven type anchor, a large anchor with an increased surface area of the anchor is used.
In the case of the block anchor, the tensile strength was strengthened by means of an anchor having an increased weight (size) of the block. When the concrete pile is used, the conventional technique is to increase the diameter and length of the pile to enhance the tensile strength. In addition, as shown in FIG. 10, many of the branch lines are usually stretched diagonally, but depending on the location, they may be set horizontally (when the side is a hillside, etc.), or they may be installed vertically (a). -Suanker-). In some cases, a means for surrounding the anchor rod and the anchor with a concrete is adopted (Fig. 11).

Next, regarding the conventional means concerning the consolidation method for soft ground, the applicant of the present invention has already disclosed in JP-A-57-155.
418 (Japanese Patent Publication No. 61-18608), JP-A-63-74.
23 (Japanese Patent Publication No. 4-5101), JP-A-2-26601.
2, JP-A-3-110287, JP-A-4-14513,
Japanese Patent Laid-Open No. 63-7423 (Japanese Patent Publication No. 4-5101) and the like are provided, but Japanese Patent Laid-Open No. 57-155418 (Japanese Patent Publication No. 61-18608) relates to a method of compacting a soft ground to form a sand pile. It is a means for improving the ground by draining the soil and promoting the consolidation settlement of the ground. Japanese Patent Laid-Open No. 2-266012 is a means for constructing a soil pile by compaction of soft ground, but a large-diameter earth auger and a small-diameter earth auger are sequentially used, preferably at the center of the soil pile. It does not leave a weakly consolidated part. Japanese Unexamined Patent Publication No. 3-110287 discloses a method of building columns in soft ground. A method of forming a soil pile by consolidating with an earth auger, and consolidating only the building column portion at the center of the soil pile is not used. Is. JP-A-4-145
13 is a large-diameter earth auger and a small-diameter earth auger.
A combination method and apparatus are disclosed in which a non-consolidated portion is left as much as possible (non-consolidated core) in the central portion of a soil pile that is consolidated by the combination with. Japanese Patent Laid-Open No. 63-7423 (Japanese Patent Publication No. 4-423)
5101) consolidation of soft ground (formation of soil pile)
A method of constructing a manhole on it is disclosed.

[0004]

DISCLOSURE OF INVENTION Problems to be Solved by the Invention The conventional consolidation method for medium-soft ground is disclosed only for means for forming a soil pile by consolidation of soft ground when building or constructing a building on the soft ground, Even if the bearing capacity of a structure built on the basis of this soil pile is strengthened, there is a big problem that the strength of tensile strength against earthquakes, wind pressures, etc. is not solved. Since the soft ground is consolidated and forms a soil pile, when a building is built on it, the bearing capacity of the soft ground is strengthened, but since the soil pile and the building are not integrated, this soil pile or sand pile is It cannot be said that the building is additionally reinforced with tensile strength. Therefore, buildings such as power transmission towers, multi-story parking lots, and utility poles that are built on the soil pile, which are relatively high in height compared to a flat area, may be collapsed or lodged for a while due to strong sways such as typhoons and earthquakes. Next, in order to enhance the tensile resistance, various anchors are used to connect the anchor rods to the structure by a branch line as described above, but in order to enhance the tensile resistance, screw anchors are used. −
There is also a problem that it is not possible to increase the number of screws or block anchors or the number of screw anchors infinitely, such as increasing the number of screws or the weight of blocks, or increasing the area of the anchor anchors. In addition to the construction of anchors (installation of branch lines) in addition to the above construction, there is a problem in terms of construction efficiency and cost, and it has been possible to consolidate the ground of the branch lines and anchor installations in the past. As a result, the tensile strength was insufficient and the power transmission tower collapsed. In addition, it is 3-11
The building pole in 0287 can obtain the pulling force of a pole such as a utility pole to some extent, but it cannot pass without installing an anchor and a branch line. This is because the soil pile and the structure do not adopt any method in terms of construction method or structure for strengthening tensile strength. The present invention integrates a soil pile, an anchor and a structure for the purpose of strengthening the pulling strength, and not only obtains the bearing strength of the structure constructed on the soil pile by the consolidation construction but also has a strong compaction density. It is provided for the purpose of strengthening the tensile strength of the building by utilizing the structure and preventing the building built on the soft ground from falling or collapsing due to the rolling of a typhoon or an earthquake.

[0005]

SUMMARY OF THE INVENTION The present invention has a hollow structure for strengthening the tensile strength of a structure such as a power transmission tower constructed especially on soft ground or a multistory parking lot with a high ground clearance or a utility pole. -Anchor with an anchor on the tip of the swinger
An anchor is projected from the tip of the auger, and the rod is detachably attached to the auger so that the rod can be coaxially rotated with the auger. Then, the excavation is carried out, and then the engagement between the earth auger and the anchor rod is released. After that, while the compaction material is being introduced, the earth aeger is reversed and the ground is compacted. The soil pile to the required depth of excavation, leaving the anchor rod having the anchor in the soil pile, and adopting a means for integrating the rod and the structure, thereby adopting a means for resisting the above-ground structure. The purpose of strengthening the tensile force could be achieved.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view of an embodiment of the device of the present invention, which is suitable for use when the earth auger (1) has a relatively small diameter, that is, when the flat area required for consolidation is relatively small. With a suitable device,
An anchor rod (3) having an anchor (2) fixed to the tip is detachably engaged and fitted near the top of the earth auger (1). In addition, the earth auger
The top of (1) is of course connected to a drive motor (5) suspended from the working machine (4) so that the auger is rotatable. Since this embodiment has the above-mentioned structure, the required position of the soft ground (6) is driven by the driving motor (5) to drive the earth auger (1) and the anchor (2). When rotating and moving forward, the anchor (2) rotates and pushes out the soft ground (6) while moving forward, and the earth auger (1) moves the ground (6) by the excavating blade (7). Dig in. Once the desired depth is reached, the excavation is stopped, the anchors (1) and anchor rods (3) are disengaged, and then the area around the arsogers (1) is released. While inserting sand, river gravel, mountain gravel, etc. as the consolidation material (8) from the ground, the earth auger (1) is rotated in the reverse direction, and the anchor (2), the anchor rod (3) and the aer Strongly compact the area around the souger (1). At this time, the work equipment (4) is used to make an earth ogre.
A compression reaction force is generated by suppressing the rise due to the reverse rotation of (1). The soil auger (1) is elevated while sequentially consolidating from the peripheral portion of the tip of the anchor (2) to consolidate the entire excavated portion, and a soil pile (9) is formed in the portion (FIG. 2). In that case, the anchor (2) and the anchor rod (3) are left in the soil pile (9) as a unit with the soil pile (9). At this time, the anchor (2) is usually left at the vertical center line of the soil pile (9) while being fixed to the rod (3).

[0007]

FIG. 3 is a second embodiment of the device of the present invention, which is an embodiment when a wide compaction portion is required. In the case of this embodiment, a large-diameter earth auger (10) and a small-diameter earth auger (11) are provided at appropriate portions of the tip of the cutting blade (7 ').
To form the excavating blade (7 ') and the earth auger (1
The anchor rod (3), which protrudes from the tip of (0) and is coaxially rotatably fitted in the auger (10), and further has the anchor (2) fixed to the tip, is used as the auger. -Ga-
(10) It is possible to rotate coaxially with (11) and the earth
The anchor (2) is protruded from the tip of the gear (11) and internally fitted. The top of the anchor rod (3) is detachably attached to the auger (10) in the top of the earth auger (10). In this embodiment, the earth auger is constructed in a plurality of stages as required to increase the consolidation surface area, its depth and volume to further enhance load bearing capacity (bearing force) and tensile strength. Is suitable.

Also in the case of this embodiment, as in the first embodiment, the earth motor is driven by the drive motor (5) of the working machine (4).
(10) After rotating (11) and the anchor (2) to excavate the required soft ground, the excavated portion is compacted as in the first embodiment (Fig. 4), and the anchor ( An anchor-integrated soil pile (9) is formed by leaving the anchor rod (3) formed by fixing 2) (FIG. 5). In the case of this embodiment, since the earth auger (10) having a large diameter and the earth auger (11) having a small diameter are used, the compact portion is enlarged and the earth auger (10) having a large diameter is formed. ) Is not consolidated or has a small compaction density, the vicinity of the center of the soil pile (9) is sufficiently compacted by a small-aperture auger (11), and the anchor (2) is attached to the central part of the consolidation. There is an anchor rod (3) with (remaining)
Anchor-integrated soil pile (9) is created.

[0009]

FIG. 6 shows a third embodiment of the present invention in which the anchor rod (12) is a hollow tube and the anchor (13) is provided with a fluid passage hole (14). -Ga- (1
It is characterized in that a rotary swivel mechanism is formed on the top of 0) so that the fluid can be injected and ejected to the anchor rod (12) and the anchor (13). Of course, the earth auger may be of a multistage type as in the second embodiment. In this embodiment, the through holes (14) are formed in the anchor rod and the anchor in the first and second embodiments.
Anchor rod (12) and anchor (13) provided with
In addition, a rotary swivel mechanism (15) is formed on the upper part of the earth auger (10), and the fluid through hole (1
The fluid (16) is connected to the fluid passage hole (14) of the anchor rod (12) so that the fluid (16) can flow into the fluid passage hole (17).
Is configured to be connectable to the fluid hose (18). Further, the rotary swivel mechanism (15) is configured to be connectable to a drive motor (5) suspended from the working machine (4) at the top thereof. Of course, the anchor rod (12) is detachably attached to the earth auger (10) at the top thereof.

Structures such as gas pipes, water pipes and cables are buried in the ground, and sometimes there are obstacles such as stone blocks and rock blocks that cannot be excavated by turning the anchor (13). It is a thing. Further, if a drilling blade is formed on the anchor (13), there is a risk that the cable, the gas pipe, etc. will be destroyed.
Therefore, when excavating while rotating the earth auger (10) and the anchor (13) with a drive motor, the anchor
When (13) hits an underground obstacle and excavation rotation stops, the work is stopped. Therefore, first, compressed air (16) or pressurized water (16) is sent to the fluid through hole (14) to the anchor (1
3) Test whether or not the obstacle can be pushed out by water pressure by ejecting it from the water, and if the obstacle cannot be eliminated, in order to confirm what the obstacle is, the fiber through hole (14) is provided in the fluid through hole (14).
It will be decided to put this into effect and proceed with the subsequent work. When excavating to a predetermined depth by the device of this embodiment, pressure water (16) is fed from the fluid through hole (14) to the anchor (13).
Needless to say, it may be jetted from the tip of the above to assist the excavation by the earth auger (10). When the excavation is carried out to a predetermined depth, the rotation of the earth auger (10) is stopped, the mortar (19) is poured from the fluid through hole (14), and the anchor (13) and the anchor (13) are fed. Harden the periphery of 13) with mortar (19), then anchor rod (12) and
The engagement with the swinger (10) is released, and the drive motor is released.
While reversing the earth auger (10) while obtaining a reaction force with the work machine (4) via the (5), the compacting material (8) is placed around the earth auger (10) from the ground. And excavated ground (6)
Then, it is sent to the inside to consolidate the required ground (6). An anchor rod (12) having an anchor rod (12) at the tip of the anchor rod (12) is present in the center of the ground where the earth auger (10) has been extracted and consolidated at the end of consolidation. A body soil pile (9) is created. Anchor rod (12) integrated with the soil pile (9)
The tensile strength of the building can be remarkably enhanced by connecting and integrating the top of the building with the legs of the transmission tower or the pillar of the multi-storey parking lot or the base of the utility pole.

[0011]

As described above, the conventional soil pile or sand pile constructed on soft ground is a soil pile or sand pile for ground reinforcement as a foundation of a structure to be built on the soil pile or sand pile. The strength of the soil pile was sufficiently effective within the scope of the above), but the consolidated soil pile and the structure constructed by using it as the foundation ground have means directly or indirectly connected to each other. Since there is no soil pile, it has bearing capacity for the building, but the building
The tensile strength of (21) against rolling due to typhoons (strong winds) and earthquakes is equal to zero. However, since the soil pile in the present invention has an anchor rod integrally having an anchor on the center line of the soil pile at the same time as the consolidation formation, the soil pile is used as a foundation ground to construct a building, and the building and the anchor rod are constructed. The structure and the anchor are integrated by connecting and fixing, but the anchor is located at least at the center of the tip of the strongly piled soil pile, so it strongly resists rolling of the structure (strong It will be a tensile strength.) It has a great effect of preventing the building from falling and collapsing due to rolling. Conventionally, in order to obtain this tensile strength, a branch line (22) is stretched on the structure as described above, and various anchors are embedded in the tip ground (in this case, the anchor rod also constitutes a part of the branch line). However, since the soft ground has not been subjected to consolidation construction, it lacks tensile strength against rolling such as strong winds and earthquakes, which caused collapse and collapse, but in the present invention it is necessary to provide a branch line for this reinforcement. There is also the advantage that there is no such thing, and the construction method is simple, easy, efficient and economical.

[Brief description of drawings]

FIG. 1 shows an anchor lot having an anchor at the tip.
Sectional explanatory drawing of the soil pile construction apparatus fitted in the swinger.

2 is an explanatory view showing a state of a soil pile formed by the apparatus of FIG.

FIG. 3 is a two-stage structure of an earth auger in which an anchor is provided.
Explanatory drawing which shows the state which completed the excavation of the soft ground by the soil pile creation apparatus which fitted the rod inside.

FIG. 4 is an explanatory view showing a soil pile being formed by the apparatus shown in FIG.

FIG. 5 is an explanatory view showing a state in which a soil pile has been completed by the apparatus shown in FIG.

FIG. 6 is an anchor rod and an anchor provided with a fluid passage hole.
Sectional explanatory drawing of the soil pile creation apparatus which fits inside.

FIG. 7 is an explanatory view showing a state of a soil pile completed by the apparatus of FIG.

FIG. 8 is an explanatory view showing a power transmission tower constructed based on the soil pile of the present invention.

FIG. 9 is an explanatory diagram showing a multilevel parking lot constructed based on the soil pile of the present invention.

FIG. 10 is an explanatory view showing a conventional electric pole provided with a branch line.

FIG. 11 is an explanatory diagram illustrating an example of a conventional utility pole having a branch line, in which a concrete is wound around an anchor and an anchor rod.

[Explanation of symbols]

 1 Ace Ogger 2 Anchor 3 Anchor Rod 4 Working Machine 5 Drive Motor 6 Soft Ground 7 Excavation Blade (Ace Oger) 7'Excavation Blade (Small Diameter Ace Ogre) −) 8 Consolidation material 9 Soil pile 10 Ars-ouger (large diameter) 11 Aers-ogger (small diameter) 12 Hollow anchor rod 13 Anchor (provided with fluid passage) 14 Fluid through hole (for anchor and anchor rod) 15 Rotary swivel mechanism 16 Fluid 17 Fluid through hole (rotary swivel mechanism) 18 Fluid hose 19 Mortar 20 Drilling blade (Aarth-auger-10) 21 Building 22 Branch line 23 Underground buried object 24 Underground rock 25 Pillar foundation concrete 26 Roll concrete

Claims (5)

[Claims] 1. An anchor rod of an appropriate length having an anchor at the tip thereof is attached to an earth auger having an appropriate diameter.
An anchor is projected at the tip of the souger so that it can be attached and detached, and is fitted inside the souger so as to be rotatable coaxially therewith.
Rotate the souger to excavate to the required depth,
The engagement between the guard and the anchor rod is released, and then the consolidating material is put in the periphery of the anchor s while rotating the anchor auger in the reverse direction, and the anchor, the anchor rod and the anchor are connected. −
An anchor-integrated soil pile in soft ground, characterized in that a soil pile is constructed by consolidating the area around the gar and pulling out only the earth slag to the ground and leaving an anchor rod having an anchor in the consolidation section. How to create. 2. The hollow rod is used as the anchor rod, and a water ejection hole is provided in the anchor so that the soil at the tip of the excavation can be confirmed by a fiber scope in response to the situation during the excavation. At the same time, it sometimes assists the excavation of the earth auger by ejecting water from the water ejection hole, and after the completion of the excavation, an appropriate amount of mortar is fed from the hollow anchor rod to the periphery of the anchor. An anchor in soft ground according to claim 1.
Construction method for integrated soil pile. 3. An anchor auger having an appropriate diameter and an anchor rod of an appropriate length having an anchor at the tip, wherein the anchor is projected from the tip of the arcauger. It is possible to rotate coaxially with the earth auger.
Installed inside the souger so that it can be detached and attached,
Is an anchor characterized in that it can be rotated forward and backward by a drive motor suspended on a work vehicle and detachably connected.
Equipment used for construction method of integrated soil pile. 4. An anchor rod is a hollow tube, a water jet hole is provided in the anchor, and a rotary swivel mechanism is formed in the upper part of the earth auger to form a hollow. Anchor
The apparatus used in the method for constructing an anchor-integrated soil pile according to claim 3, wherein the rod is configured to be capable of injecting a fluid. 5. An earth auger is constructed so that it can be coaxially rotated in a plurality of stages depending on the size of the tube diameter, and an anchor rod having an anchor at its tip is detachably provided in the center thereof. An anchor according to claim 3 or 4, characterized in that
Equipment used for construction method of integrated soil pile.