JP3472562B2 - How to cast steel underground - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for driving a steel sheet pile used for mountain retaining, earth retaining, seawall protection, etc., H-section steel, steel pipe, or other underground driven steel material.

[0002]

2. Description of the Related Art Conventionally, Japanese Laid-Open Patent Publication No. 8-170332 proposes a driving assisting device and a driving method for driving a steel sheet pile on a solid ground such as a gravel layer containing boulders in driving a steel sheet pile. There is.

In this driving assisting device, crush rods are attached to the inner surface of the auxiliary sheet pile along the inner surface of the steel sheet pile along the longitudinal center line and at the positions on both sides of the jet tube, and the tip of the crush rod is attached. Has a structure that protrudes from the tip of the auxiliary sheet pile,
The driving method is to attach this driving auxiliary device to the inner surface of the steel sheet pile, which is not used for driving, and simultaneously drive both the steel sheet pile and the driving auxiliary device to the ground with a vibrating pile driving machine. The ground is crushed by the two crushing rods together with the high-pressure water jetted from the pipe, and when the steel sheet pile reaches a predetermined depth, only the driving auxiliary device is pulled out to the ground. It assists the driving, prevents damage, and eliminates the need to excavate the ground.

[0004]

By the way, since the two crushing rods are made of steel rails, the tip portions of the auxiliary sheet piles projecting from the tips are cut at a right angle to the longitudinal direction. However, with such a crushing rod, there is a problem that the ground crushing effect is small, resistance is generated at the tip surface against placing, and the excavation speed becomes slow.

Further, since the tip of the crushing rod is heavily worn and its replacement frequency is high, there is a problem that the work efficiency is low.

Therefore, an object of the present invention is that it is excellent in abrasion resistance, can withstand repeated use many times, is economically advantageous, has an excellent ground crushing effect, and improves excavation speed to improve work efficiency. An object of the present invention is to provide a method for placing underground cast steel material that is possible.

[0007]

In order to solve the above-mentioned problems, the invention of claim 1 attaches an auxiliary member of a driving assisting device along the inner surface of a steel material to be driven, and Both of the driving aids are simultaneously driven into the ground by the vibration type pile driver, and high-pressure water is jetted from the jet pipe attached to the driving aids according to the conditions of the ground, so that the steel material can reach the specified depth. When it reaches, in the method of placing a steel material for underground casting in which only the driving assistance device is pulled to the ground, a tip metal fitting having a cross-sectional shape similar to that of the steel material is attached to the tip portion of the auxiliary member in the above-mentioned driving assistance device. The tip of the metal fitting is cut diagonally to form a cutting edge, and the cutting edge is padded with a material having wear resistance. Attach it with the tip of the metal fitting aligned with the tip of the steel. Simultaneously with Da設 is obtained by employing the structure to pull out the pouring aid to after casting.

According to a second aspect of the present invention, there is provided a driving auxiliary device including an auxiliary member having a cross-sectional shape substantially the same as that of the steel material to be driven, and a vibrating pile driver at the driving position of the steel material to be driven. When the tip of the auxiliary member reaches a predetermined depth, the driving auxiliary device is put on the ground by using the jet pipe attached to the driving auxiliary device depending on the condition of the ground to jet high-pressure water. In the method of placing a steel material into the ground, in which the steel material is drawn out and the steel material is placed in the drawn-out trace, a tip metal fitting having a substantially same cross-sectional shape is attached to the tip end portion of the auxiliary member in an extended manner in the above-mentioned placing auxiliary device. The tip of the tip fitting is cut diagonally to form a cutting edge, and the cutting edge is padded with a wear-resistant material. It employs a configuration in which it is placed and then pulled out.

In each of the above-mentioned inventions, a low-alloy steel containing tungsten carbide is used as the wear-resistant material to be built up on the cutting edge of the tip fitting, and the hardened buildup makes the cutting edge of the tip fitting stronger. Greatly improved and can be used repeatedly.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show a driving assisting device 1 of a first embodiment used in the method for driving underground cast steel material according to the present invention. A steel sheet pile A is used as the underground cast steel material. It is a type that is used and mounted on the inner surface side of the steel sheet pile A and simultaneously driven.

The above-mentioned driving auxiliary device 1 is an auxiliary sheet pile 2 which serves as an auxiliary member along the inner surface of the steel sheet pile A to be driven.
It is composed of a tip fitting 3 attached to the tip of the auxiliary sheet pile 2 and jet pipes 4 for jetting high-pressure water attached to both sides on the inner surface side of the auxiliary sheet pile 2 along the longitudinal direction.

The auxiliary sheet pile 2 is made of the same steel material as the steel sheet pile A, and is formed in a sectional shape similar to that of the steel sheet pile A so that the sheet pile A is just fitted and fitted to the inner surface of the steel sheet pile A.
The total length including is set to the same length as the steel sheet pile A. At the upper end of the auxiliary sheet pile 2, a plate 5 for projecting the auxiliary sheet pile after driving is projected.

The tip fitting 3 is made of wear-resistant cast steel, such as Ni-Cr-Mo cast steel, and has the same cross-sectional shape as the auxiliary sheet pile 2 and has a required length up and down. , The upper end of which is attached to the tip of the auxiliary sheet pile 2 by welding.

As shown in FIG. 3, the tip fitting 3 is formed by cutting the tip end obliquely in the thickness direction to form a cutting edge.
In addition, it has a structure in which a special overlay (hard overlay) 7 having a predetermined thickness is made of a material having wear resistance. The cutting edge portion 6 is
In the thickness direction, for example, 30 ° to 50 °, preferably 45 °
It becomes sharp by cutting diagonally at a certain angle, and the diagonal cutting improves the excavation property at the time of placing, and the special overlay 7 improves wear resistance, enabling repeated use many times. . As the special overlay 7, a hard overlay containing tungsten carbide is used.

Further, in order to provide the integrity when the steel sheet pile A and the auxiliary sheet pile 2 are simultaneously driven, as shown in FIG.
When the notches 8 are provided on both sides at the tip of the tip fitting 3, the engaging pieces 9 are welded on both sides at the tip of the steel sheet pile A, and when the auxiliary sheet pile 2 is set on the steel sheet pile A, the notches 8 are formed. The engaging piece 9 is engaged in the driving direction.

The jet pipes 4 for jetting the high-pressure water are fixed at positions on both sides on the inner surface side of the auxiliary sheet pile 2 in a symmetrical arrangement, and their upper ends are connected to a high-pressure water supply pump (not shown). The high-pressure nozzle tip 10 is attached to the tip portion located inside the tip fitting 3, and the tip portion and an appropriate position on the way are covered with a cover member 11.

The driving assisting apparatus of the first embodiment has the above-mentioned structure. Next, a method for driving a steel sheet pile using the driving assisting apparatus 1 will be described.

An auxiliary sheet pile 2 is laid on the inner surface of a steel sheet pile A to be driven so that the cutting edge portion 6 of the tip fitting 3 coincides with the tip of the steel sheet pile A or slightly projects. After appropriately clamping the upper end of the auxiliary sheet pile 2 with a clamping tool,
The steel pile A and the auxiliary sheet pile 2 are installed in a predetermined position while holding the upper end portion by a vibrating hammer driving machine such as a vibro hammer, and the vibrating pile driving machine is started in this state to start the steel sheet pile A and the auxiliary sheet pile 2.
It is placed on the ground together while giving vibration to.

At the time of the above-mentioned driving, since the tip of the tip fitting 3 of the auxiliary sheet pile 2 is a cutting edge portion 6 which is obliquely cut in the thickness direction, the steel sheet pile A and the auxiliary sheet pile 2 can smoothly enter the ground. It will be guided, and the efficiency of driving into the ground will be improved.

During the above-mentioned driving, high-pressure water is jetted from the tip high-pressure nozzle tip 10 of the jet pipe 4 attached to the auxiliary sheet pile 2 in the direction of excavation to crush the ground of the steel sheet pile A and the tip portion of the auxiliary sheet pile 2. To do. By injecting this high-pressure water together with the vibration of the vibration type pile driver, it is possible to efficiently excavate even the hard ground such as gravel mixed with boulders, and the steel sheet pile A and the auxiliary sheet pile 2 can smoothly enter the ground. The steel sheet pile A can be efficiently penetrated to a predetermined depth.

When the steel sheet pile A penetrates to a predetermined depth,
By removing the vibrating pile driver and the clamps and pulling out only the auxiliary sheet pile 2 to the ground, the placing of the steel sheet pile A is completed, and by repeating such placing of the steel sheet pile A, the steel sheet pile A
The earth retaining wall, etc. will be constructed.

FIG. 4 shows a second embodiment of a driving aid for use in a method for driving a steel material for underground casting. H-shaped steel B is used as the steel material for underground driving, and a driving assistant device 1a is used. Is this H
The figure shows a type in which both sides of the shape steel B are mounted and simultaneously placed.

The driving assisting devices 1a on both sides are an auxiliary member 2a which is housed along the inner surface of the H-shaped steel B to be driven along the recess, and a tip fitting attached to the tip of the auxiliary member 2a by welding or the like. 3a and a jet pipe 4 for jetting high-pressure water, which is attached along the longitudinal direction at a plurality of positions on the inner surface side of the auxiliary member 2a.

The auxiliary member 2a is made of the same steel material as the H-shaped steel B, and is formed into a U-shaped cross section so that the auxiliary member 2a just fits and fits inside the H-shaped steel B, and the entire length including the tip fitting 3a is H-shaped steel. It is set to the same length as B. Although not shown in the drawings, a plate for pulling out the auxiliary member 2a after driving is projectingly provided on the upper end of the auxiliary member 2a, as is the case with the first embodiment.

The tip fitting 3a is formed in the same cross-sectional shape as the auxiliary member 2a, and the tip of the tip is cut diagonally in the thickness direction to form a cutting edge, and the cutting edge portion 6 is made of a material having wear resistance. It has a structure with a special buildup 7 of thickness.

The materials of the tip fitting 3a and the special overlay 7 and the structure of the cutting edge portion 6 are the same as those in the first embodiment. Further, the attachment of the auxiliary member 2a to the H-shaped steel B and the jet pipe 4 for injecting high-pressure water provided in the auxiliary member 2a have the same structure as in the first embodiment, and the same portions are denoted by the same reference numerals. Replace with explanation. The same applies to the subsequent embodiments.

The placement assisting device of the second embodiment is constructed as described above. Next, a placement method using this placement assisting device 1a will be described.

Auxiliary members 2a are provided on the inner surfaces of both sides of the H-shaped steel B to be driven, with the cutting edge portion 6 of the tip fitting 3a aligned with the tip of the H-shaped steel B, or slightly protruding as shown. After overlapping, the upper ends of the H-shaped steel B and the auxiliary member 2a are appropriately clamped together by a clamping tool, and then the upper end is held by a vibrating pile driving machine such as a vibro hammer so that the H-shaped steel B and the auxiliary member 2a are predetermined. Then, as in the first embodiment, the vibration type pile driver is activated to drive the H-shaped steel B and the auxiliary member 2a together while driving them to the ground, After installation, only the auxiliary member 2a is pulled out to the ground.

FIG. 5 shows a third embodiment of a driving auxiliary device used for a method of driving underground driven steel material. The driving auxiliary device 1b uses a steel sheet pile A as an underground driving steel material. It is a preceding driving type for this steel sheet pile A.

The driving assisting device 1b is an auxiliary sheet pile 2b which is an auxiliary member having a cross sectional shape substantially the same as that of the steel sheet pile A to be driven, and a similar sectional shape attached to the tip of the auxiliary sheet pile 2b by welding or the like. Tip metal fitting 3b having an auxiliary sheet pile 2b
And a jet pipe 4 for jetting high-pressure water, which is attached along the longitudinal direction at positions on both sides on the inner surface side.

Next, a placing method using the placing assisting device of the third embodiment will be described.

The upper end of the auxiliary sheet pile 2b is held by a vibration type pile driving machine such as a vibro hammer, the auxiliary sheet pile 2b is installed at a position where the steel sheet pile A is not set, and the vibration type pile driving machine is activated to assist. The sheet pile 2b is driven into the ground while being vibrated.

At the time of the above-mentioned driving, since the tip of the tip metal fitting 3b of the auxiliary sheet pile 2b is the cutting edge portion 6 which is obliquely cut in the thickness direction, the auxiliary sheet pile 2a is smoothly guided to enter the ground, and the ground is ground. It will improve the efficiency of casting.

In addition, during the above-mentioned driving, the auxiliary sheet pile 2b
Tip of high pressure nozzle tip 10 of jet tube 4 attached to
High-pressure water is sprayed in the direction of excavation to crush the ground at the tip of the auxiliary sheet pile 2b. By injecting the high-pressure water together with the vibration of the vibration type pile driver, the auxiliary pile 2b can be penetrated to a predetermined depth by efficiently excavating even on solid ground.

When the auxiliary sheet pile 2b has penetrated to a predetermined depth, the vibrating pile driving machine is removed, the auxiliary sheet pile 2b is pulled out to the ground, and then the steel sheet pile A is built right above this pulling-out mark, and the vibrating type pile is struck. Vibration of the hammer causes the steel sheet pile A to be an auxiliary sheet pile 2b.
It will be placed on the ground along the extraction mark of.

As described above, since the traces of withdrawing the auxiliary sheet pile 2b are formed in advance in the driving portion of the steel sheet pile A, there is no great resistance to the driving of the steel sheet pile A, and the steel sheet pile A can be efficiently used. It will be able to be placed well.

FIG. 6 shows a fourth embodiment of a driving assisting device used for a method of driving underground cast steel. The driving assisting device 1c uses H-shaped steel as the underground cast steel. It is a pre-casting type for this H-section steel.

The casting assisting device 1c includes an auxiliary H-shaped steel 2c which is an auxiliary member having a cross-sectional shape substantially the same as that of the H-shaped steel to be driven, and a similar cross section attached to the tip of the auxiliary H-shaped steel 2c by welding or the like. Shaped tip fitting 3c and auxiliary sheet pile 2
It is composed of a plurality of jet pipes 4 for jetting high-pressure water attached along the longitudinal direction at positions on both sides of the inner surface of c.

The driving method using the driving assisting apparatus of the fourth embodiment is such that the upper end of the auxiliary H-shaped steel 2c is held by a vibrating pile driving machine such as a vibro hammer and the H-shaped steel is not driven. Auxiliary H-section steel 2c is built in the position where the auxiliary H-shaped steel 2c is to be installed.
When it is driven into the ground while giving vibration to the shape steel 2c, and the auxiliary H-shape steel 2c penetrates to a predetermined depth, the vibration type pile driver is removed, the auxiliary H-shape steel 2c is pulled out to the ground, and then the extraction marks The H-section steel is built directly above and the H-section steel is driven into the ground by the vibration of the vibrating pile driving machine along the extraction trace of the auxiliary H-section steel 2c.

FIG. 7 shows a fifth embodiment of a driving aid for use in a method for driving underground cast steel, wherein the driving aid 1d uses a steel pipe as the underground cast steel. This is a preceding driving type for this steel pipe.

The casting assisting device 1d is an auxiliary steel pipe 2d which is an auxiliary member having substantially the same sectional shape as the steel pipe to be driven.
And a tip fitting 3d having a similar cross-sectional shape attached to the tip of the auxiliary steel pipe 2d by welding or the like, and a plurality of high-pressure water jets installed along the longitudinal direction at positions on the inner peripheral surface side of the auxiliary steel pipe 2d. And a jet pipe 4 for use.

In the driving method using the driving assisting apparatus of the fifth embodiment, the position where the upper end of the auxiliary steel pipe 2d is held by the vibrating hammer driving machine such as a vibro hammer and the steel pipe is not driven The auxiliary steel pipe 2d is built in the auxiliary steel pipe 2d after that, as in the third embodiment, the vibration type pile driver is activated.
When the auxiliary steel pipe 2d penetrates to a predetermined depth while giving vibration to the ground, the vibrating pile driver is removed, the auxiliary steel pipe 2d is pulled out to the ground, and then the steel pipe is placed directly above this pull-out mark. The steel pipe is built into the ground by the vibration of the vibrating pile driving machine along the withdrawal trace of the auxiliary steel pipe 2d.

In both of the above-mentioned embodiments, the tip fittings 3, 3a to 3d of the driving assisting device used for driving the steel material are
Since the tip is a cutting edge portion 6 cut obliquely in the thickness direction, the excavation property at the time of placing is improved, and the excavation speed is about 3 times faster than the conventional one, and the cutting edge portion 6 Is a low-alloy steel containing tungsten carbide, and the special overlay 7 has been applied, so the hardening due to this special overlay 7 significantly improves the strength and wear resistance is about 5 times that of conventional products. It is economical because it is up and can be used repeatedly.

[0045]

As described above, according to the driving method of the present invention, a tip fitting having a cross-sectional shape substantially the same as that of the underground cast steel material is attached to the tip of the auxiliary member in an extended manner, and Since the steel material is driven by using the driving assisting device that cuts the tip end diagonally and is used as the cutting edge, the ground cutting effect is excellent due to the cutting edge of the tip metal fitting that is cut diagonally. In both the type in which medium-cast steel is simultaneously cast and the type in which preceding steel is cast in the ground, it is possible to efficiently cast steel by increasing the excavation speed.

Further, since the steel material is driven by using the driving assisting device in which the cutting edge portion of the tip fitting of the auxiliary member is padded with a wear resistant material, the strength of the cutting edge portion is greatly improved. Since it is possible to use it repeatedly many times without exchanging the tip fitting, it is possible to efficiently perform the work of placing the steel material.

[Brief description of drawings]

FIG. 1 (A) is a front view showing a driving assisting device of a first embodiment used in a driving method of the present invention, and FIG. 1 (B) is an enlarged front view of a tip fitting part of the driving assisting device. Figure, (C)
Is the bottom view of (B)

FIG. 2 (A) is an exploded perspective view of a tip metal fitting and a steel sheet pile of the above-mentioned driving aid, and FIG. 2 (B) is an enlarged perspective view of the tip metal fitting showing a state where the driving aid is set on the steel sheet pile. Figure

FIG. 3 is an enlarged vertical cross-sectional view of the tip of the metal fitting.

FIG. 4A is a perspective view showing a portion of a tip fitting of a placement assisting apparatus of a second embodiment used in the placement method of the present invention, and FIG. 4B is a front view showing a portion of the tip fitting. , (C) is a cross-sectional plan view of (B)

FIG. 5 (A) is a front view showing a driving assistance device of a third embodiment used in the driving method of the present invention, and FIG. 5 (B) is a bottom view of this driving assistance device.

FIG. 6 (A) is a perspective view showing a tip fitting part of a placement assisting device according to a fourth embodiment of the present invention, and FIG. 6 (B) is a front view showing the tip fitting part. , (C) is a cross-sectional plan view of (B)

FIG. 7 (A) is a partially cutaway perspective view showing a portion of a tip fitting of a placement assisting device of a fifth embodiment used in the placement method of the present invention, and FIG. 7 (B) is a portion of the tip fitting. Is a vertical sectional front view, and (C) is a cross-sectional plan view of (B).

[Explanation of symbols]

A steel sheet pile 1 Placing auxiliary device 1a Placing auxiliary device 1b Placing auxiliary device 1c Placing auxiliary device 1d Placing assistance device 2 auxiliary sheet pile 2a Auxiliary member 2b Auxiliary sheet pile 2c Auxiliary H-section steel 2d auxiliary steel pipe 3 Tip fitting 3a Tip fitting 3b Tip fitting 3c Tip fitting 3d tip fitting 4 High pressure water jet pipe 6 cutting edge 7 Special overlay

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroki Horie 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Within Taisei Corporation (72) Inventor Kazuya Sugiyama 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo No. Taisei Corporation (72) Inventor Shin Ikuta 1-12-19 Kitahori, Nishi-ku, Osaka-shi Kurimoto Tatesho Co., Ltd. (72) Inventor Shigeo Fukui 1-12-19 Kitahori, Nishi-ku, Osaka Inside Kurimoto Co., Ltd. (72) Inventor Yasunori Mitsui 1-12-19 Kitahori, Nishi-ku, Osaka City Inside Kurimoto Co., Ltd. (56) Reference JP-A-8-170332 (JP, A) JP-A-50- 153408 (JP, A) JP 53-70507 (JP, A) JP 6-322760 (JP, A) JP 2000-352052 (JP, A) JP 58-207416 (JP, A) Actual Kai 59-89183 (JP, U) Actual 55 110546 (JP, U) JitsuHiraku Akira 58-72239 (JP, U) (58 ) investigated the field (Int.Cl. ^7, DB name) E02D 7/24 E02D 5/04 E02D 7/18

Claims (2)

(57) [Claims] 1. An auxiliary member of a driving assistance device is attached along an inner surface of a steel material to be driven, and both the steel material and the driving assistance device are simultaneously driven into the ground by a vibrating pile driving machine, Depending on the conditions of the above, by using high-pressure water injection from a jet pipe attached to the driving aid, when the steel material reaches a predetermined depth, only the driving aid is pulled to the ground. In the above-mentioned driving assist device, a tip fitting having a cross-sectional shape similar to that of steel is attached to the tip of the auxiliary member, and the tip of this tip fitting is cut diagonally to form a blade tip, and the blade tip has wear resistance. Using a material that has been padded,
It is necessary to attach the tip of the metal fittings to the inner surface of the steel material for which the placement aid is to be placed, with the tip of the metal fitting aligned with the tip of the steel, and to place it at the same time as the steel material. Characteristic method of placing underground steel. 2. A driving assisting device having an auxiliary member having substantially the same cross-sectional shape as the steel material to be driven is driven into the ground by a vibrating pile driver at the driving position of the steel material to be driven. However, depending on the conditions of the ground, high-pressure water is also sprayed from the jet pipe attached to the driving aid, and when the tip of the auxiliary member reaches the prescribed depth, the driving aid is pulled out to the ground, and this withdrawal mark In the method of placing underground steel in which steel is placed, a tip fitting having substantially the same cross-sectional shape is attached to the tip end of the auxiliary member in an extended manner in the above-mentioned placing auxiliary device, and the tip of the tip fitting is attached. Is cut diagonally to form a cutting edge, and the cutting edge is used to build up with a wear-resistant material, and this driving auxiliary device is driven to the driving position of the steel material to be driven, and then pulled out. A method for placing underground cast steel material, which is characterized in that