JPH07150562A - Sheet pile burying construction method and auger device thereof - Google Patents

Abstract

PURPOSE:To facilitate work on a work site by putting a sheet pile in an excavated vertical hole, and excavating the hole while transporting excavated earth and sand to this when the next adjacent hole is excavated. CONSTITUTION:An auger device 7 is composed of a casing 1, a sheet pile, a slidingly movable guide 9 and an excavating head 11, and a blocking-up member 31 to block up discharge of excavated earth and sand 29 is installed on the lower end of the casing 1. Next, a vertical hole 6a is excavated by the auger device 7, and the sheet pile 4a is put in this. In succession, when an adjacent vertical hole 6b is excavated, earth and sand 39 excavated by the excavating head 11 is not discharged aboveground by the blocking-up member 31, and is consolidated while transferring it to the vertical hole 6a in which the sheet pile 4a is inserted. The adjacent vertical hole 6b is also excavated, and a sheet pile 6b is put in, and the next vertical hole 6c is excavated by using this as a guide, and this earth and sand 39 is similarly consolidated and buried while transferring it to the vertical hole 6b in which the sheet pile 4b is inserted, and these are repeated in order, and the sheet piles 4a, 4b... are buried, and work is made progress and executed. Thereby, an aboveground space on which the excavated earth and sand 39 are loaded can be dispensed with.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for burying sheet piles and an auger device used therefor.

[0002]

2. Description of the Related Art FIG. 8 is a process diagram for explaining a conventional method for burying sheet piles. Conventionally, vertical holes 6 have been excavated by an earth auger or the like having screw blades, and these vertical holes 6 have been excavated. The sheet pile 4 is hung by a winch or a crane provided in a pile driver, or, in the case of hard ground, the hook 3 welded to the outer periphery of the casing 1 in the excavator in which the screw auger 2 is inserted into the casing 1 is a sheet pile. It hangs on the locking rod 5 welded to the corner of No. 4 and pushes the sheet pile 4 while excavating further.

[0003]

However, according to this conventional method, since the excavated earth and sand in the vertical hole 6 is discharged to the ground, a space for accumulating the excavated earth and sand on the ground is required, and the excavated earth and sand is scooped. Therefore, there is a problem that a work of backfilling the vertical hole 6 is required due to such circumstances. Further, there is a problem that the sheet pile 4 is not firmly fixed to the ground simply by backfilling the earth removal from the ground.

In view of the above problems, the present invention does not require a space for accumulating excavated earth and sand, does not require a backfilling operation of excavated earth and sand, and is a method for burying sheet piles in which the sheet pile is firmly fixed to the ground. And its auger device.

[0005]

In order to achieve the above-mentioned object, the method for burying a sheet pile according to the present invention puts a sheet pile in a vertical hole that has been excavated, and when excavating the next vertical hole, the soil generated by the excavation is removed by the sheet pile. It is characterized by excavating it while moving it into the vertical hole next to it.

An auger device for embedding a sheet pile according to the present invention includes a cylindrical casing, a guide fixed to an outer peripheral surface of the casing and sliding along an edge of the sheet pile.
An auger in which an auger shaft is inserted in the center of the casing and a drilling head is provided in a portion protruding from the lower end of the casing,
It is characterized by comprising an auger shaft bearing provided at the lower end of the casing, and a closing member that is incorporated as a component of the bearing or is separate from the bearing to close the lower end of the casing. In the device of the present invention, a structure in which a conical excavation earth and sand guide member is further attached to the lower end of the casing, or the excavation claw of the excavation head has a twisted shape, and its outer surface has a shape along the excavation arc. The structure is preferable.

[0007]

As described above, the construction method of the present invention is a construction method in which the excavated soil is transferred into the vertical hole previously excavated at the same time as the excavation.
Almost no excavated soil is discharged to the ground. Also,
In the construction method of the present invention, the sand is compacted toward the root of the sheet pile, and the sheet pile is firmly fixed to the ground.

Further, in the auger device of the present invention, the vertical hole is excavated while the outer guide of the casing slides on the edge of the sheet pile and is guided by the sheet pile. Further, since the auger shaft is supported by the bearing at the lower end portion of the casing, the auger shaft is prevented from coming close to the adjacent vertical hole side having a small penetration resistance. The excavated earth and sand excavated by the excavation head protruding from the lower end of the casing is filled in the adjacent vertical hole previously excavated because the lower end of the casing is closed by the closing member. When the conical closing member is provided at the lower end of the casing, the excavated earth and sand can be smoothly moved to the adjacent vertical hole, and the compaction action can be favorably performed. If the excavation claw is twisted, it is possible to excavate the hard ground where rocks appear.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a process view showing in vertical section an embodiment of a method for burying sheet piles according to the present invention, and FIG. The construction method of this embodiment is first shown in FIG.
As shown in (a), the vertical hole 6a is excavated with an auger,
Next, as shown in FIG. 1B, the vertical plate 6a is inserted into the sheet pile 4a.
Put in. The work of inserting the sheet pile 4a is performed by suspending the sheet pile 4a with a wire rope 40 that is suspended by a winch (not shown) provided in the pile driver. Of course, the casing 1 of the auger device 7 to be described later can be held by the sheet pile and pushed in as in the conventional case.

Next, as shown in FIG. 1C, a vertical hole is excavated by the auger device 7. As shown in the longitudinal sectional view of FIG. 3, the auger device 7 is fixed to the outer peripheral surface of a cylindrical casing 1 and a casing 1A which is integral with the casing 1 or is added to the casing 1 as shown in the drawing. Four
A guide 9 that slides along the edge of the casing 1, an auger shaft 10 that is inserted through the center of the casing 1, and an excavating head 11 that is provided at a portion of the casing 10 that projects from the lower end of the casing 1A. is there.

In the auger device 7, the casing 1A
Since the lower end surface of the casing 1A is closed by the closing member 31 attached to the lower end of the casing 1A or by the bearing 18, the excavated earth and sand excavated by the excavation head 11 is not discharged to the ground, and the vertical hole 6a into which the sheet pile 4a is inserted. Move to. In such an excavation process, the excavated earth and sand fall in the adjacent vertical hole 6a up to the depth in the middle of the vertical hole, but when reaching a depth deeper than the earth and sand accumulated in the vertical hole 6a, the adjacent vertical hole 6a is reached. Since the excavated earth and sand have already entered, the excavated earth and sand further consolidate the earth and sand in the vertical hole 6a and excavate while partially pushing it up. In the vertical hole 6b excavated in this way, as shown in FIG.
Put in. Next, as in the case of FIG. 1C, as shown in FIG. 1E, the next vertical hole 6 is formed by using the second sheet pile 4b as a guide.
c is excavated, and the excavated earth and sand at this time are transferred to the adjacent vertical hole 6b in which the sheet pile 4b is inserted. Even in this case, the excavated earth and sand fall into the vertical hole 6b until the middle of excavation, and thereafter, consolidation and partial lifting are performed. In FIG. 2, the vertical holes 6a, 6b ... And the sheet piles 4a, 4b ...

By moving the excavated earth and sand into the vertical hole that was previously excavated during the excavation in this manner, except for the excavated earth and sand of the first vertical hole 6a, almost no space is discharged to the ground, and therefore a space for accumulating the excavated earth and sand on the ground. Is unnecessary,
In addition, the backfilling work into the vertical hole becomes unnecessary. Further, the lower parts of the sheet piles 4a, 4b, ... Are firmly supported by the consolidation of the excavated earth and sand.

Explaining the auger device 7, as shown in FIG. 3, the auger shaft 10 is rotated by an auger rotating device (not shown) which is lifted and lowered by a well-known pile driver. Auger shaft 10A and additional shaft 10B
The additional shaft 10B is joined by fitting the hexagonal portion 13 at the upper end to the inner surface of the lower end of the main auger shaft 10A in the fitting portion 14 of the hexagonal hole and fixing it with the retaining pin 15. The joint casing 1A is joined to the lower end of the casing 1 by a brazing joint, with the bolt 16 and the concavo-convex fitting portion (not shown) for detent to prevent rotation. The additional casing 1A supports the additional shaft 10B concentrically by ring-shaped upper and lower ball bearings 17 and 18. These bearings 17, 18 are prevented from moving up and down by the step portions 19, 20 of the additional casing 1A, and the bolts 21,
It is fixed by 22.

As shown in the perspective view of FIG. 4, the excavation head 11 has a hexagonal portion 24 at the upper end that fits into the coupling portion 23 of the hexagonal hole at the lower end of the extension shaft 10B, and is shown in FIG. As described above, the retainer pin 25 is used to prevent the retainer from joining. Further, in the excavating head 11 of the present example, three claw mounting plates 26 are spirally welded, and the claw mounting plates 26 are fitted with concave and convex portions to each mounting portion and are joined by the bolts 27, as shown in FIG. As shown in the front view, the excavating claws 28 and 29 having a twisted shape are
As shown in the front view of FIG. 5 (B), the tip of the claw 29 (similar to 28) is horizontal, and as shown in the plan view of FIG. 5 (C), the outer peripheral surface a matches the rotary excavation trajectory b. It is attached so that it forms a vertical plane. These excavated claws 2
8 and 29 are provided with a step so that the inner excavating claw 28 is lower than the outer excavating claw 29. At the center of the drill bit 11, below the inner drill claw 28,
A pair of the twisted excavating claws 30 are attached.

The main auger shaft 10A and the additional shaft 10
B, the shaft 11a of the drilling head 11 is hollow, and it is possible to fill concrete milk into the ground.

The closing member 31 has a conical shape so that the excavated earth and sand moves smoothly to the adjacent vertical hole excavated previously and is well consolidated, and also has a function of protecting the bearings 17 and 18, and FIG. As shown in the perspective view of FIG. 3, the closing member 31 has a structure in which the half-divided dividing members 31a and 31b are fixed by bolts 33 which are added to and screwed into screw holes 32 in the lower surface of the casing 10B. Further, as shown in FIG. 6, the guide member 9 has a bifurcated shape and is fixedly attached to the outer peripheral surface of the casing 10B by welding (it may be bolted or riveted).

In the case of realizing the excavating device of the present invention, it is possible to adopt a structure in which screw blades are provided around the auger shaft 10 and the blades slide on the inner circumference of the casing 1. As shown in FIG. 3, by adopting a structure in which the auger shaft 10 is supported by the bearings 17 and 18, the auger shaft 10 is held in the center of the casing 1, the excavation head 11 is not displaced, and is always located in the center of the casing 1. In addition, even if the auger shaft 10 provided with screw blades is used, the screw blades are not worn by friction.

When ring-shaped ball bearings 17, 18 are provided as in this embodiment, these bearings 17, 1 are used.
Since 8 has a strong exterior material,
Although the bearings 17 and 18 can be used also as a material for preventing upward discharge of earth and sand, as in the present example, by providing the closing member 31 that functions to guide the earth and sand, the earth and sand to these bearings 17 and 18 can be provided. It is possible to prevent damage due to collision of the.

Further, by forming the excavating claws 28, 29 (more preferably also the central claw 30) in a twisted shape as described above, as compared with the case of using a straight excavating claw, hard ground such as rocky ground. To be able to excavate
It is as described in Japanese Patent No. 33633 and Japanese Patent Publication No. 3-36999.

The first vertical hole 6a shown in FIG. 1 and FIG.
Can be excavated by a normal screw auger other than the auger device shown in FIG. 3, but if the auger device 7 shown in FIG. 3 is used, construction can be performed without increasing the types of auger device, It is economical. In this case, when the auger device 7 of FIG. 3 is used as it is, the excavation radius of the excavation head 11 has to be smaller than the distance from the auger axis to the tip of the guide 9, so that the guide 9
Becomes excavation resistance, making it impossible to excavate hard ground,
As shown in FIG. 7, if the excavation radius R1 is greater than the distance R2 from the auger axis to the tip of the guide 9 R2, the hard ground can be excavated. In this case, the excavated earth and sand 33 pass through the outer periphery of the casing 1 and the arrow Z
It is discharged as shown in. Drilling head 11X shown in FIG.
2, the diameter L1 of the vertical hole 6a to be drilled first is the diameter of the vertical holes 6b, 6c ...
Greater than L2.

[0021]

According to the method of the present invention, a sheet pile is placed in an excavated vertical hole, and when excavating the next vertical hole, earth and sand generated by excavation are moved into the vertical hole next to the sheet pile. Therefore, it does not require a space for loading excavated soil on the ground,
It facilitates construction in narrow construction sites. Further, the work of backfilling the excavated earth and sand is not necessary, and the work time can be shortened and the labor can be reduced. Further, the sheet pile can be firmly fixed to the ground.

According to the apparatus of claim 2, the earth and sand excavated by the excavation head projecting from the lower end of the casing,
Upward soil removal is prevented by the closing member that closes the lower end of the casing, and it is moved into the adjacent vertical hole excavated previously,
Simultaneously with excavation, earth and sand can be backfilled in the adjacent vertical holes.

According to the third aspect of the present invention, since the conical closing member is provided at the lower end of the casing, the closing member exerts a guide action for pushing the earth and sand into the adjacent vertical hole, and at the lower part of the vertical hole, the compaction is performed. The action is excellent, and the bearing is protected by the closing member.

According to the apparatus of claim 4, since the excavation claw of the excavation head has a twisted shape and the outer surface thereof has a shape along the excavation arc, construction of a sheet pile on hard ground where rock appears is also possible. It will be possible.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a process of one embodiment of a construction method of the present invention.

FIG. 2 is a plan view showing a state in the middle of construction by the construction method of FIG.

FIG. 3 is a vertical sectional view showing an embodiment of the device according to the present invention.

4 is a perspective view showing the drilling head of the embodiment of FIG. 3. FIG.

FIG. 5A is a front view showing the excavation claw of the present embodiment,
(B) is a front view showing a state in which the excavation claw of (A) is attached to the head, and (C) is a plan view of (B).

FIG. 6 is an exploded perspective view showing a closing member of the present embodiment.

FIG. 7 is a vertical sectional view showing an example of an apparatus for excavating a first vertical hole in the present invention.

FIG. 8 is a plan view showing a conventional sheet pile embedding method.

[Explanation of symbols]

 1 Casing 4 Sheet Pile 6 Vertical Hole 7 Auger Device 9 Guide 10 Auger Shaft 11 Excavation Head 17, 18 Bearing 28-30 Excavation Claw 31 Closing Member

Claims (4)

[Claims] 1. An embedding of a sheet pile, characterized in that a sheet pile is inserted into an excavated vertical hole, and when excavating a next vertical hole, earth and sand generated by excavation are moved into an adjacent vertical hole having a sheet pile and excavated. Construction method. 2. A cylindrical casing, a guide fixed to the outer peripheral surface of the casing and sliding along the edge of the sheet pile, an auger shaft inserted through the center of the casing and protruding from the lower end of the casing. An auger provided with an excavating head in a portion, a bearing for an auger shaft provided at the lower end of the casing, and a closing member that is incorporated as a component of the bearing or is separate from the bearing and closes the lower end of the casing. An auger device for burying sheet piles, which comprises 3. The sheet pile embedding auger device according to claim 2, wherein a conical member is attached to the lower end of the casing as the closing member. 4. The auger device for burying sheet piles according to claim 2, wherein the excavating claw of the excavating head has a twisted shape, and the outer surface thereof has a shape along the excavating arc.