JP2002038481A - Driving method of underground driven steel member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driving method for a steel member capable of improving the working efficiency due to increase of the excavating speed and economically driving the steel member. SOLUTION: A tip metal fitting 3 having a cross sectional shape similar to a steel sheet pile A is extendedly fitted to the tip of an auxiliary sheet pile 2 to be arranged along the inside face of the steel sheet pile A to be driven. The tip of the metal fitting 3 is cut obliquely to form a cutter edge 6. A driving auxiliary device 1 in which the cutter edge 6 is specially overlaid 7 with an brasion resistant material is fitted to the inside face of the steel sheet pile A to be driven, in a state that the tip of the tip metal fitting 3 is matched with the tip of the steel sheet pile A and driven together with the steel sheet pile A. In this way, the steel sheet pile A can be efficiently driven by drawing out the driving auxiliary device 1 after driving operation of the pile.

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 steel sheet piles, H-section steels, steel pipes, and other underground steel materials used for mountain retaining, earth retaining, revetment, and the like.

[0002]

2. Description of the Related Art Japanese Patent Laid-Open Publication No. Hei 8-170332 proposes a setting assisting device and a setting method for setting a steel sheet pile on a hard ground such as a gravel layer mixed with cobble stones. I have.

[0003] In this driving assistance device, a jet pipe and crushing rods are attached to the inner surface side of an auxiliary sheet pile along the inner surface of a steel sheet pile along a longitudinal center line at positions on both sides of the jet pipe. Has a structure projecting from the tip of the auxiliary sheet pile,
The driving method is as follows: this driving aid is attached to the inner surface of the steel sheet pile to be driven, and both the steel sheet pile and the driving aid are driven into the ground simultaneously with a vibratory pile driver. The ground is crushed by two crushing rods together with the high-pressure water injected from the pipe, and when the steel sheet pile reaches a predetermined depth, only the driving assist device is pulled out to the ground, thereby, It assists casting and prevents damage and eliminates the need for excavation work on the ground.

[0004]

The two crushing rods have a structure in which a steel rail is used and a tip protruding from the tip of the auxiliary sheet pile is cut at right angles to the longitudinal direction. However, such a crushing rod has a problem that the effect of crushing the ground is small, the tip surface is resistant to the driving, and the excavation speed is reduced.

[0005] In addition, the crushing rod has a problem that the working efficiency is poor because the tip is severely worn and its replacement frequency is increased.

Accordingly, an object of the present invention is to improve the work efficiency by improving the abrasion resistance and withstanding repeated use repeatedly, being economically advantageous, excelling in the ground crushing effect, and increasing the excavation speed. It is an object of the present invention to provide a method of placing a steel material underground.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, an invention according to claim 1 is to attach an auxiliary member of a driving assist device to an inner surface of a steel material to be driven along with the steel material. Both the driving aids are simultaneously driven into the ground with a vibratory pile driver, and high-pressure water injection is also used from the jet pipe attached to the driving aid according to the conditions of the ground, so that the steel can reach a predetermined depth. When reached, in the method of placing underground casting steel material in which only the placement assisting device is pulled out to the ground, a tip fitting having a cross-sectional shape similar to that of the steel material is attached to the tip of the auxiliary member, and The tip of the tip fitting is cut obliquely to form a cutting edge, and the tip is made of abrasion-resistant material. Attach the metal fitting with the tip of the metal fitting aligned with the tip of the steel material. 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 assist device provided with an auxiliary member having substantially the same cross-sectional shape as a steel material to be driven into a pile. In accordance with the conditions of the ground, the high-pressure water jet is used together with the jet pipe attached to the auxiliary device, and when the tip of the auxiliary member reaches a predetermined depth, the auxiliary device is placed on the ground. In the method of placing steel material underground for placing a steel material in the trace of the removal, a tip fitting having substantially the same cross-sectional shape is attached to the tip of the auxiliary member to the casting assist device in an extended manner. The tip of the tip metal fitting is cut obliquely to form a cutting edge, and the tip of the cutting edge is overlaid with a wear-resistant material. It adopts a configuration to pull out after casting.

In each of the above-mentioned inventions, a low-alloy steel containing tungsten carbide is used as a wear-resistant material to build up the cutting edge of the tip fitting, and the hardened overlaying increases the strength of the cutting edge of the tip fitting. It is greatly improved and can be used repeatedly.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 to FIG. 3 show a first embodiment of a casting assisting device 1 used in the method of casting underground steel according to the present invention, wherein a steel sheet pile A is used as underground casting steel. This is a type that is attached to the inner surface side of the steel sheet pile A and is simultaneously driven.

The driving device 1 comprises an auxiliary sheet pile 2 serving as an auxiliary member along the inner surface of a steel sheet pile A to be driven.
It comprises a tip fitting 3 attached to the tip of the auxiliary sheet pile 2, and a jet pipe 4 for jetting high-pressure water attached along the longitudinal direction at positions on both sides on the inner surface side of the auxiliary sheet pile 2.

The auxiliary sheet pile 2 is made of the same steel material as that of the steel sheet pile A, and has a cross-section similar to that of the steel sheet pile A so as to be fitted and fitted on the inner surface side of the steel sheet pile A.
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 pulling out the auxiliary sheet pile after driving is projected.

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

As shown in FIG. 3, the tip metal fitting 3 is formed by cutting the tip portion obliquely in the thickness direction to form a cutting edge.
A special overlay (hardened overlay) 7 having a predetermined thickness is made of a material having wear resistance. The cutting edge portion 6
In the thickness direction, for example, 30 ° to 50 °, preferably 45 °
By cutting obliquely at an angle of about a degree, it becomes sharp, and the diagonal cut improves excavation at the time of driving, and the special overlay 7 improves wear resistance and enables repeated use many times. . The special overlay 7 is a hardened overlay containing tungsten carbide.

As shown in FIG. 2, the steel sheet pile A and the auxiliary sheet pile 2 are integrated when they are driven simultaneously.
When notches 8 are provided on both sides at the tip of the tip fitting 3, welding 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 notch 8 The engaging piece 9 is engaged with the driving direction.

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

The driving assistance device of the first embodiment has the above-described configuration. Next, a method of driving a steel sheet pile using the driving assistance device 1 will be described.

The auxiliary sheet pile 2 is overlaid on the inner surface of the steel sheet pile A to be driven in such a manner that the cutting edge 6 of the tip metal fitting 3 coincides with or slightly projects from the tip of the steel sheet pile A. After appropriately holding the upper end of the auxiliary sheet pile 2 integrally with a holding tool,
The upper end is held by a vibratory hammer such as a vibro hammer, and the steel sheet pile A and the auxiliary sheet pile 2 are erected at predetermined positions. In this state, the vibratory pile driver is activated to start the steel sheet pile A and the auxiliary sheet pile 2
To the ground together with vibration.

At the time of the above-mentioned driving, the tip metal fitting 3 of the auxiliary sheet pile 2 has a cutting edge 6 whose tip is cut obliquely in the thickness direction, so that the steel sheet pile A and the auxiliary sheet pile 2 can smoothly enter the ground. It is guided and improves the efficiency of placing on the ground.

At the time of the above-mentioned driving, high-pressure water is jetted from the high-pressure nozzle tip 10 of the jet pipe 4 attached to the auxiliary sheet pile 2 in the excavation direction to crush the ground at the tip of the steel sheet pile A and the auxiliary sheet pile 2. I do. By driving the vibratory pile driver together with the injection of high-pressure water, it is possible to efficiently excavate even hard ground such as sand and gravel mixed with cobblestone, and the steel sheet pile A and the auxiliary sheet pile 2 can smoothly enter the ground. And the steel sheet pile A can be efficiently penetrated to a predetermined depth.

When the steel sheet pile A penetrates to a predetermined depth,
The driving of the steel sheet pile A is completed by removing the vibratory pile driver and the holding tool, and pulling out only the auxiliary sheet pile 2 to the ground, and repeating the driving of the steel sheet pile A as described above.
Earth retaining wall and the like are constructed.

FIG. 4 shows a second embodiment of a placement assisting apparatus used for a method of placing underground casting steel, wherein an H-shaped steel B is used as the underground casting steel and a placement assisting apparatus 1a. Is this H
It shows a type that is attached to the inner surface sides of both sides of the mold steel B and is simultaneously driven.

The above-mentioned driving assisting devices 1a on both sides are an auxiliary member 2a to be fitted along the concave inner surface of the H-shaped steel B to be driven, and a tip metal fitting attached to the distal end of the auxiliary member 2a by welding or the like. 3a, and a jet pipe 4 for jetting high-pressure water attached along a 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 that of the H-shaped steel B, is formed in a U-shaped cross section so as to be fitted and fitted on the inner surface side of the H-shaped steel B, and has a total length including the tip metal fitting 3a. It is set to the same length as B. Although not shown, a plate for pulling out the auxiliary member 2a after casting is projected from the upper end of the auxiliary member 2a, as in the first embodiment.

The tip metal fitting 3a is formed in the same cross-sectional shape as the auxiliary member 2a. The tip of the metal tip 3a is cut obliquely 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 overlay 7 of thickness.

The material of the tip metal fitting 3a and the special overlay 7 and the structure of the cutting edge portion 6 are the same as those of the first embodiment. The attachment of the auxiliary member 2a to the H-shaped steel B and the jet pipe 4 for jetting high-pressure water provided on the auxiliary member 2a also have the same structure as in the first embodiment. Substitute description. The same applies to the following embodiments.

The driving assistance device of the second embodiment has the above-described configuration. Next, a driving method using the driving assistance device 1a will be described.

The auxiliary members 2a are provided on the inner surfaces of both sides of the H-shaped steel B to be cast in a state where the cutting edge portion 6 of the tip metal fitting 3a coincides with the tip of the H-shaped steel B or slightly protrudes as shown. After the H-shaped steel B and the upper end of the auxiliary member 2a are integrally clamped appropriately by a holding tool, the H-shaped steel B and the auxiliary member 2a are held in a predetermined position by holding the upper end with a vibratory pile driver such as a vibro hammer. Then, as in the first embodiment, the vibratory pile driving machine is started to drive the H-shaped steel B and the auxiliary member 2a together into the ground while driving the same. After installation, only the auxiliary member 2a is pulled out to the ground.

FIG. 5 shows a third embodiment of a placement assisting device used for a method of placing underground casting steel. The placement assisting device 1b uses a steel sheet pile A as an underground casting steel. This is a precedent type for this steel sheet pile A.

An auxiliary driving device 1b is an auxiliary sheet pile 2b, which is an auxiliary member having substantially the same cross-sectional shape as the steel sheet pile A to be driven, and a similar cross-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 the inner side of the inner side.

Next, a description will be given of a driving method using the driving assist device of the third embodiment.

The upper end of the auxiliary sheet pile 2b is held by a vibratory hammer such as a vibro hammer, and the auxiliary sheet pile 2b is erected at a position where the steel sheet pile A is to be driven. The sheet pile 2b is driven into the ground while being vibrated.

At the time of the driving, the tip metal 3b of the auxiliary sheet pile 2b has a cutting edge 6 whose tip is cut obliquely in the thickness direction, so that the auxiliary sheet pile 2a is smoothly guided into the ground, and This will improve the efficiency of casting into the steel.

At the time of the driving, the auxiliary sheet pile 2b
High pressure nozzle tip 10 of jet tube 4 attached to
, High-pressure water is injected in the direction of excavation to crush the ground at the tip of the auxiliary sheet pile 2b. By driving the vibration of the vibratory pile driver together with the injection of the high-pressure water, the excavation can be efficiently performed even on hard ground, and the auxiliary sheet pile 2b can penetrate to a predetermined depth.

When the auxiliary sheet pile 2b has penetrated to a predetermined depth, the vibratory pile driver is removed, the auxiliary sheet pile 2b is pulled out to the ground, and then a steel sheet pile A is erected just above the drawing mark, and the vibratory pile The steel sheet pile A is turned into the auxiliary sheet pile 2b by the vibration of the driving machine.
Is placed on the ground along the pulling trace of.

As described above, since the pulling trace of the auxiliary sheet pile 2b is formed in advance in the portion where the steel sheet pile A is cast, no great resistance is generated in driving the steel sheet pile A, and the efficiency of the steel sheet pile A is improved. It will be possible to cast well.

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

An auxiliary casting device 1c is an auxiliary H-beam 2c, which is an auxiliary member having substantially the same cross-sectional shape as the H-shaped steel to be cast, and a similar cross-section attached to the tip of the auxiliary H-shaped steel 2c by welding or the like. Tip metal fitting 3c having a shape and auxiliary sheet pile 2
and a plurality of high-pressure water jet pipes 4 attached along the longitudinal direction at positions on both sides on the inner surface side of c.

The driving method using the driving assist device of the fourth embodiment is based on a method in which the upper end of the auxiliary H-shaped steel 2c is held by a vibratory hammer such as a vibro hammer and the H-shaped steel is driven. The auxiliary H-beam 2c is erected at the position where the auxiliary H-shaped steel is to be driven.
When the auxiliary H-shaped steel 2c penetrates to a predetermined depth while applying vibration to the mold steel 2c, the vibratory pile driving machine is removed, the auxiliary H-shaped steel 2c is pulled out to the ground, and then, the trace of this pulling out is removed. An H-shaped steel is erected directly above, and the H-shaped steel is driven into the ground along the trace of the extraction of the auxiliary H-shaped steel 2c by the vibration of a vibratory pile driver.

FIG. 7 shows a fifth embodiment of a casting assist device used for a method of casting an underground casting steel material. The casting assistance device 1d uses a steel pipe as the underground casting steel material. This is a pre-cast type for this steel pipe.

The auxiliary casting 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 installed.
A tip metal 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 attached along the longitudinal direction at a position on the inner peripheral surface side of the auxiliary steel pipe 2d. And the jet pipe 4 for use.

The driving method using the driving assist device according to the fifth embodiment is based on a position where the upper end of the auxiliary steel pipe 2d is held by a vibratory hammer such as a vibro hammer and the steel pipe is driven. The auxiliary steel pipe 2d is built into the auxiliary steel pipe 2d, and thereafter, as in the third embodiment, the vibration type pile driving machine is started to activate the auxiliary steel pipe 2d.
When the auxiliary steel pipe 2d penetrates to a predetermined depth while applying vibration to the ground, the vibratory pile driver is removed, the auxiliary steel pipe 2d is pulled out to the ground, and then the steel pipe is placed immediately above the pulling trace. The steel pipe is driven into the ground along the trace of pulling out the auxiliary steel pipe 2d by the vibration of the built-in and vibratory pile driver.

In both of the above embodiments, the tip metal fittings 3, 3a to 3d of the casting assisting device used for casting the steel material are as follows.
Since the tip is a cutting edge portion 6 cut obliquely in the thickness direction, the excavation performance at the time of driving is improved, the excavation speed is increased by about three times as compared with the conventional one, and the cutting edge portion 6 is improved. Is made of a low-alloy steel containing tungsten carbide, and the special overlay 7 is applied, so that the hardening by the special overlay 7 greatly improves the strength, and the wear resistance is about five times that of the conventional one. It is economical because it can be used repeatedly and can be used repeatedly.

[0045]

As described above, according to the casting method of the present invention, the tip metal having substantially the same cross-sectional shape as the underground steel casting is attached to the tip of the auxiliary member in an extended manner. The steel material is driven by using a driving assist device that cuts the tip diagonally and uses a cutting edge. In both the type of simultaneous casting of the middle casting steel material and the preceding casting type of the underground casting steel material, the steel material can be efficiently cast by increasing the excavation speed.

In addition, since the steel member is driven by using a driving assisting device in which the edge of the metal fitting of the tip of the auxiliary member is overlaid with a wear-resistant material, the strength of the edge is greatly improved. Therefore, it is possible to repeatedly use the steel material many times without replacing the tip metal fitting, and it is possible to efficiently perform the casting work of the steel material.

[Brief description of the drawings]

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

FIG. 2A is an exploded perspective view of a tip metal fitting and a steel sheet pile of the same driving assistance device, and FIG. 2B is an enlarged perspective view of a tip metal fitting showing a state where the driving assistance device is set on the steel sheet pile. Figure

FIG. 3 is a longitudinal sectional view in which a blade edge portion of a tip metal fitting is enlarged.

FIG. 4 (A) is a perspective view showing a tip metal part of a driving assist device according to a second embodiment used in the casting method of the present invention, and FIG. 4 (B) is a front view showing the metal tip part; , (C) is a cross-sectional plan view of (B).

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

FIG. 6 (A) is a perspective view showing a tip fitting part of a placing assistance device according to a fourth embodiment used in the placing method 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. 7A is a partially cutaway perspective view showing a tip metal part of a driving assist device according to a fifth embodiment used in the driving method of the present invention, and FIG. 7B is a part of the metal tip part; (C) is a cross-sectional plan view of (B).

[Explanation of symbols]

 A Steel sheet pile 1 Casting assist device 1a Casting assist device 1b Casting assist device 1c Casting assist device 1d Casting assist device 2 Auxiliary sheet pile 2a Auxiliary member 2b Auxiliary sheet pile 2c Auxiliary H-shaped steel 2d Auxiliary steel pipe 3 Tip fitting 3a Tip fitting 3b Tip fitting 3c Tip fitting 3d Tip fitting 4 Jet tube for jetting high-pressure water 6 Cutting edge 7 Special overlay

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Jun Kuribayashi 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Taisei Construction Co., Ltd. (72) Inventor Hiroki Horie 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Taisei Corporation (72) Inventor Kazuya Sugiyama 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Taisei Corporation (72) Inventor Shin Ikuta 1-112-19 Kitahorie, Nishi-ku, Osaka Co., Ltd. Kurimoto Steel Works (72) Inventor Shigeo Fukui 1-112 Kitahorie, Nishi-ku, Osaka-shi Co., Ltd. Kurimoto Works F-term (reference) 2D049 FA01 FA07 FB03 2D050 AA12 AA13 CB32 CB42

Claims (2)

[Claims] An auxiliary member of a casting assist device is attached to an inner surface of a steel material to be cast along with the steel material, and both the steel material and the casting assist device are simultaneously driven into the ground by a vibratory pile driver. A method of placing steel underground in which the high-pressure water is jetted from a jet pipe attached to the placement assisting device in accordance with the conditions of the above, and when the steel reaches a predetermined depth, only the placement assisting device is pulled out to the ground. In the casting assisting device, a tip fitting having a cross section similar to that of steel is attached to the tip of the auxiliary member, and the tip of the tip fitting is cut obliquely to form a cutting edge. Using a material that has been overlaid with a certain material,
Attach the tip of the tip metal fitting to the tip of the steel material on the inner surface of the steel material to which the casting assistance device is to be cast, and place the steel at the same time as the steel material.After the casting, pull out the casting assistance device. Characteristic method of casting steel underground. 2. A driving assisting device having an auxiliary member having substantially the same cross-sectional shape as a steel material to be driven into a ground is driven into a ground at a driving position of the steel to be driven by a vibratory pile driving machine. Then, depending on the conditions of the ground, high-pressure water is also jetted from a jet pipe attached to the driving aid, and when the tip of the auxiliary member reaches a predetermined depth, the driving aid is pulled out to the ground and In the method of placing steel material in the ground, the tip metal having substantially the same cross-sectional shape is attached to the tip of the auxiliary member in an extended manner, and the tip of the tip metal is attached to the tip of the auxiliary member. Is cut diagonally to form a cutting edge, and the cutting edge is used to build up with a wear-resistant material. A method of casting steel underground.