JPH09302654A - Construction method and device for driving steel pipe pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set digging and boring ranges to be closer to an outer diameter of a steel pipe pile than in the case of a conventional replacement construction method, and perform placement of a steel pipe pile in one process simultaneously with digging and boring without providing a process of replacement by good quality soil at favorable precision without using large-scaled temporarily installed facilities. SOLUTION: An applied down-the-hole hammer 1 is of such a type that a bit part 1a can be diameter-enlarged, the down-the-hole hammer 1 and a rod 4 installed on a pile driver 2 are inserted into a steel pipe pile 6, the bit part 1a of the down-the hole hammer 1 protruded from a tip of the steel pipe pile 6 is diameter-enlarged, and after diameter-enlarging, the steel pipe pile 6 is put on the down-the-hole hammer 1, so boring and driving are started by the down-the-hole hammer 1. After completion of boring, the bit part la is diameter-contracted, and the rod 4 inside the steel pipe pile 6 and the down- the-hole hammer 1 are pulled up.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for driving a steel pipe sheet pile in construction work.

[0002]

2. Description of the Related Art Gravel, boulder, rubble, shut-off work in concrete, placing steel pipe sheet pile in earth retaining wall construction, steep ground and hard ground in water, steel pipe sheet pile retaining wall in rock, etc. Pile hammer, hydraulic (pneumatic) hammer, steel pipe sheet pile construction work such as gantry and pier construction
A steel pipe sheet pile may be hit directly on the ground as it is with various hammers such as a vibro hammer.

When directly hit with such a hammer,
If there is gravel ground or boulders, the steel pipe sheet pile will be deformed by impact,
It may be damaged and make it impossible to place it.

Therefore, the current construction method is to use a fully swiveling casing press-fitting machine in combination with a hammer club bucket, a heavy hanging chisel, down the hole hammer, etc. to replace it with good quality earth and sand and wrap it to form a wall. After continuous construction, steel pipe sheet piles are placed at the improved location. In this case, the excavation diameter for replacing with good quality soil will be much larger than the diameter of the steel pipe sheet pile.

[0005]

According to the conventional replacement method as described above, in the case of construction on a steeply sloping ground, a lake bed with a large water depth, a river bed, a seabed ground, etc., a fully swivel casing press-fit for replacement replacement work is performed. It requires very large-scale temporary equipment such as the installation base of the machine, and it is difficult to secure the accuracy of the lapping work for replacement by building the casing.

The object of the present invention is to eliminate the disadvantages of the above-mentioned conventional example, to make the excavation / drilling area closer to the outer diameter of the steel pipe sheet pile, as compared with the case of the conventional replacement method, and to replace it with good quality sand. It is an object of the present invention to provide a steel pipe sheet pile construction method and device capable of accurately performing steel pipe sheet piles in one step simultaneously with excavation / drilling without using a large-scale temporary equipment.

[0007]

In order to achieve the above object, the present invention provides a method for driving a steel pipe sheet pile, wherein the down-the-hole hammer used has a bit part whose diameter can be expanded.
Insert the down-the-hole hammer and rod attached to the pile driver into the steel pipe sheet pile, expand the bit part of the down-the-hole hammer that comes out from the tip of the steel pipe sheet pile, and after expanding the diameter, insert the steel pipe sheet pile into the down-the-hole hammer and cut with the down-the-hole hammer. After the hole driving is started and the drilling is completed, the diameter of the bit part can be reduced to pull up the rod inside the steel pipe sheet pile and the down the hole hammer. In the case of hard ground at the tip of the steel pipe sheet pile, it has a joint with a carbide bit attached, and by connecting the joints with each other, the following steel pipe sheet piles can be accurately and easily driven with the preceding steel pipe sheet pile as a guide. It is possible.

As a device for driving a steel pipe sheet pile, the diameter of the bit portion can be increased, and further, a down-the-hole hammer having a locking portion having a diameter larger than the diameter when the diameter of the bit portion is reduced is provided above the bit portion. A tip ring is provided inside the tip of the steel pipe sheet pile into which the down-the-hole hammer is inserted so as to make the inner diameter of the steel pipe sheet pile smaller than the locking portion of the down-the-hole hammer. Further, the steel pipe sheet pile can be easily driven by providing a joint having a cemented carbide bit attached to the tip thereof.

According to the first aspect of the present invention, a down-the-hole hammer having an enlarged bit portion is used to drill a diameter slightly larger than the outer diameter of the steel pipe sheet pile, thereby reducing the tip resistance and peripheral friction of the steel pipe sheet pile. Steel pipe sheet pile can be placed at the same time as drilling.

According to the present invention as set forth in claims 2 and 4, it is possible to accurately drive the trailing steel pipe sheet pile with the leading steel pipe sheet pile as a guide by connecting the joints to each other, and further, the cemented carbide at the tip of the joint is used. It is possible to cut ground, rocks, etc. with a bit, and to cut and remove root-setting mortar etc. in the joint of the pre-cast steel pipe sheet pile.

According to the third aspect of the present invention, in addition to the above-mentioned action, the tip ring provided on the steel pipe sheet pile prevents the down-the-hole hammer from shifting the drilling position, and the hammer bit for the joint portion of the preceding steel pipe sheet pile is used. While preventing damage, the hammer's vibrational impact force is transmitted directly to the steel pipe sheet pile,
Drilling and driving can be performed reliably at the same time.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 7 are side views of respective steps showing one embodiment of a method for driving a steel pipe sheet pile according to the present invention.

The steel pipe sheet pile driving apparatus of the present invention will be described first. In FIGS. 2 and 3, reference numeral 1 denotes a down-the-hole hammer, which is an air driven hammer, which is mounted on a crawler type pile driver 2. Suspend from the device (auger machine) 3.

As shown in FIG. 2, the down-the-hole hammer 1 is arranged at the tip of the boring rod 4, and is shown in FIGS.
As shown in Fig. 3, the bit portion 1a is in a reduced diameter state depending on whether or not a gap is provided in the central portion where three horizontal blade-shaped bodies in which a large number of excavation bits 5 are planted overlap to form a diaphragm of a camera. Therefore, the diameter can be expanded.

FIG. 11 shows a reduced state of the bit portion 1a.
Reference numeral 12 denotes a diameter expansion state. When transmitting the rotational force of the driving device 3 to the down the hole hammer 1 via the drilling rod 4, it is rotated to the right to be a diameter expansion state, and to the left to be a diameter reduction state. Become.

Further, as shown in FIGS. 8 and 9, the down-the-hole hammer 1 has a drilling rod 4 above the bit portion 1a.
An engaging portion 9 having a diameter larger than the diameter of the bit portion 1a when the diameter of the bit portion 1a is reduced is provided between and.

Reference numeral 6 denotes a steel pipe sheet pile through which the down-the-hole hammer 1 and the hole-drilling rod 4 can be inserted, and as shown in FIGS. 13 to 15, angle members having an L-shaped cross section are opposed to each other with a gap therebetween. A male joint 7 in which the female joint 7a and the angle member having an L-shaped cross section are arranged so as to open in opposite directions.
b and b are provided so as to face the longitudinal direction on the left and right side portions, respectively.

Further, the female joint 7a and the male joint 7b are provided with a cemented carbide bit 8 at their tips. The portion of the carbide bit 8 also constitutes a joint, and includes a female joint 7a and a male joint 7
b is a bit having a different shape.

In addition to this, a tip ring 10 is provided inside the tip of the steel pipe sheet pile 6 so that the inner diameter of the steel pipe sheet pile is smaller than the outer diameter of the locking portion 9 of the down-the-hole hammer 1.

Next, the method for driving the steel pipe sheet pile according to the present invention, which is carried out by using the driving, will be described. First, as shown in FIG. 1, the steel pipe sheet pile 6 is hung on the temporary receiving stand 11 by using the crawler crane 12, and is temporarily received by the head.

As shown in FIG. 2, using the pile driver 2, the down-the-hole hammer 1 and the drilling rod 4 mounted on the pile driver 2 are inserted into the temporarily received steel pipe sheet pile 6. At this time, the bit portion 1a of the hammer is in a reduced diameter state as shown in FIG.

As shown in FIG. 3, the auxiliary winding wire for the pile driver 2
The steel pipe sheet pile 6 is lifted by 13, and the driving device (auger machine) 3, the boring rod 4, and the down the hole hammer 1 are simultaneously wound up, and the bit portion 1a protruding from the tip of the steel pipe sheet pile 6
Expand the diameter.

As shown in FIG. 4, after expanding the diameter, the steel pipe sheet pile 6 is arranged and the steel pipe sheet pile 6 is lifted up on the auger side.

As shown in FIG. 5, the steel pipe sheet pile 6 is moved to a predetermined place and installed, and as shown in FIG. 6, the pile core at the driving place is taken out, and the conductors 14 are set on both sides of the steel pipe. Start drilling while paying attention to the inclination of.

In this case, as shown in FIG. 13 to FIG. 15, the steel pipe sheet pile 6 which is subsequently driven with respect to the steel pipe sheet pile 6 which was previously driven is previously driven by the engagement of the female joint 7a and the male joint 7b. The steel pipe sheet pile 6 can be driven into the guide.

In FIG. 14, α indicates the range of excavation by the down the hole hammer 1, but the female joint 7a and the male joint 7b.
Protrudes from this range. The female joint 7a and the male joint 7b
Carbide bit 8 provided at the tip of the shredder cuts rocks, rocks, etc., out of the excavation range with the down-the-hole hammer 1, and mortar hardening etc. in the joint of the steel pipe sheet pile that was previously cast. Cut and remove.

As shown in FIG. 7, after the boring is completed, the down-the-hole hammer 1 and the boring rod 4 are reversed, and the bit portion 1a is reduced in diameter to remove the boring rod 4 and the down-the-hole hammer 1 from the inside of the steel pipe sheet pile 6. Pull up.

Although not shown in the drawing, after the pulling up, the rooting mortar is pressure-fed from the ground into the steel pipe sheet pile and placed, and the insides of the joints of the female joint 7a and the male joint 7b are cleaned and cleaned using a poly pipe. Insert a waterproofing agent injection bag, insert a perforated PVC pipe into this injection bag, pour the mixed urethane liquid from the mouth of the PVC pipe, and fill up to the mouth,
Stop water.

[0029]

As described above, in the steel pipe sheet pile driving method and apparatus of the present invention, the excavation / drilling range can be made closer to the steel pipe sheet pile outer diameter than in the case of the conventional replacement construction method. In addition, the steel pipe sheet pile can be accurately placed in one step at the same time as excavation and drilling without the step of replacing with high quality soil without using a large-scale temporary equipment.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a first step showing an embodiment of a steel pipe sheet pile driving method of the present invention.

FIG. 2 is a vertical cross-sectional side view of a second step showing an embodiment of the method for placing a steel pipe sheet pile according to the present invention.

FIG. 3 is a vertical cross-sectional side view of a third step showing an embodiment of the steel pipe sheet pile driving method of the present invention.

FIG. 4 is a vertical sectional side view of a fourth step showing an embodiment of the method for driving a steel pipe sheet pile according to the present invention.

FIG. 5 is a vertical cross-sectional side view of a fifth step showing an embodiment of the method for placing a steel pipe sheet pile according to the present invention.

FIG. 6 is a vertical cross-sectional side view of a sixth step showing an embodiment of the steel pipe sheet pile driving method of the present invention.

FIG. 7 is a vertical cross-sectional side view of a seventh step showing an embodiment of the steel pipe sheet pile driving method of the present invention.

FIG. 8 is an enlarged side view of the portion A of FIG. 3 when the diameter is reduced.

9 is an enlarged side view of the portion A of FIG. 3 when the diameter is enlarged.

FIG. 10 is a partially cutaway side view of the down the hole hammer used.

FIG. 11 is a bottom view of the down-the-hole hammer used when the diameter is reduced.

FIG. 12 is a bottom view of the down-the-hole hammer used when expanding the diameter.

FIG. 13 is a plan view showing a driving state of a steel pipe sheet pile.

FIG. 14 is a plan view showing details of a joint of a steel pipe sheet pile.

FIG. 15 is a side view showing a driving state of a steel pipe sheet pile.

[Explanation of symbols]

1 ... Down the hole hammer 1a ... Bit part 2 ... Pile driver 3 ... Drive device 4 ... Drilling rod 5 ... Drilling bit 6 ... Steel pipe sheet pile 7a ... Female joint 7b ... Male joint 8 ... Carbide bit 9 ... Locking part 10 ... Tip ring 11… Temporary receiving stand 12… Crawler crane 13… Auxiliary winding wire 14… Conducting material

Front page continued (72) Inventor Kenji Kuroiwa 1-3-15 Awaza, Nishi-ku, Osaka City, Osaka Prefecture Kashima Construction Co., Ltd. Kansai Branch (72) Inventor Keiji Kawahara 1-3-15 Awaza, Nishi-ku, Osaka City, Osaka Kashima Construction Co., Ltd. Kansai Branch (72) Inventor Chiaki Urushima 1-3-15 Awaza, Nishi-ku, Osaka-shi, Osaka Kashima Construction Co., Ltd. Kansai Branch (72) Inventor Sadayuki Nakamuro 1-3, Awaza, Nishi-ku, Osaka-shi, Osaka No. 15 Kashima Construction Co., Ltd. in the Kansai branch (72) Inventor Takeshi Hirokawa 3-22 Nakanoshima 3-chome, Kita-ku, Osaka-shi, Osaka Prefecture Kansai Electric Power Co., Inc. (72) Inventor Kosuke Yokoyama Sayo-cho, Sayo-gun, Yamagata 501 Yokoyama Foundation Co., Ltd. (72) Inventor Takeshi Hayashi 1528, Nakashinda, Yokoi, Kobe-cho, Anpachi-gun, Gifu Prefecture Mitsubishi Materials Corporation Gifu Works

Claims (4)

[Claims] 1. The down-the-hole hammer used has a bit part whose diameter can be expanded, and the down-the-hole hammer and rod mounted on a pile driver are inserted into the steel pipe sheet pile, and the bit part of the down-the-hole hammer protruding from the tip of the steel pipe sheet pile is used. After expanding the diameter, the steel pipe sheet pile is subjected to the down-the-hole hammer, the drilling operation is started with the down-the-hole hammer, and after completion of the drilling, the bit part is reduced in diameter to pull up the rod inside the steel pipe sheet pile and the down-the-hole hammer. A method for placing steel pipe sheet piles. 2. The steel pipe sheet pile according to claim 1, wherein the steel pipe sheet pile has a joint having a carbide bit attached to the tip end thereof, and the joint steel pipe sheet pile is used to drive the trailing steel pipe sheet pile by using the pre-cast steel pipe sheet pile as a guide. Pile construction method for sheet pile. 3. A down-the-hole hammer in which the diameter of the bit portion is expandable, and further a locking portion having a diameter larger than the diameter when the diameter of the bit portion is reduced is provided above the bit portion, and this down-the-hole hammer is inserted. A steel pipe sheet pile setting device, wherein a tip ring is provided inside the tip of the steel pipe sheet pile so as to make the inner diameter of the steel pipe sheet pile smaller than the engaging portion of the down-the-hole hammer. 4. The steel pipe sheet pile placing apparatus according to claim 3, wherein the steel pipe sheet pile is provided with a joint having a cemented bit attached to a tip end portion thereof.