JPS63223219A - Piling work for hard ground - Google Patents

Abstract

PURPOSE:To drive a pile into hard ground in a short time at low cost by a method in which a pile having a strong striker on its tip is driven into the ground to form a pile pit, and the pile is penetrated. CONSTITUTION:A vibro-hammer 3 is hung down from a crane 2, and a steel sheet pile 5 welded with a striker 5B made of tool carbon steel, Cr-Mo steel, etc., is attached to the lower end of a pile 5A made of rolled steel for usual structures. Several water-conveyance pipes 6 and nozzles 7 are provided along the sheet pile 5, and the pile 5 is driven while removing broken stones by pressure water from a high-pressure water pump 8. Afterwards, the plate 5 is drawn out, and a steel sheet pile 12 without striker is hung down from the crane 2 and driven by the hammer 3 or penetrated into the pile pit 11 without driving.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention is applied to shaped steel and steel sheet piles on hard ground such as the Iwayu layer.

Concerning the method of driving piles into hard ground for driving types such as steel pipe piles.

(Prior art) Conventionally, as a construction method for driving types such as H-shaped steel, ■-shaped steel, steel sheet piles, and steel pipe piles using a vibrating pile driver, the Japanese Patent Publication No. 57-136 was used.
The method of driving piles into bedrock as disclosed in Japanese Patent No. 90 is known. This method of driving piles into bedrock consists of types such as shaped steel, steel sheet piles, and steel pipe piles, and a water guide pipe, and the water guide pipe is movable in the vertical direction with respect to the pile and is attached to the pile adjacent to it. The pile is driven into the bedrock by driving the tip of the pile into the bedrock using a vibrating pile driver to crush the bedrock, and then dislodging the crushed rock with water jetted from the water guide pipe.

(Problem to be solved by the invention) However, in the conventional technology, when the depth of pile driving into the rock is deep or when the rock is relatively hard, in other words, when the N value (l
If the number of blows required to freely fall a hammer of 63.5 ka ffi 75 cm and drive a sampler for standard personnel testing 30 cm is large, there was a risk that the tip of the pile would bend or break during pile driving. For this reason, the piles that were in the middle of being driven had to be pulled out and new piles were driven separately, leading to longer construction times and increased construction costs.

The present invention has been made based on the above-mentioned problems, and an object of the present invention is to enable piling driving into hard ground in a timely manner of 1111 times, and at a lower cost.

[Structure of the Invention] (Means for Solving the Problems) A pile 5 having a strong impact portion 5BFr provided at the tip of the pile body 5A is driven into the hard ground 4 to form a pile hole 11. The main pile 12 without a striking part is inserted into.

(Function) After forming the pile hole 11 in the hard ground 4 by the striking part 5B,
The main pile 12 can be inserted into the pile hole 11 to complete the construction work.

(Embodiment) Figures 1 to 6 show a first embodiment, and in Figure 1, a guide frame 1 for holding a stake to be described later at a predetermined location is shown.
is installed by crane 2. Next, as shown in FIG. 2, a vibrating pile driver, for example a vibrohammer 3, is suspended from the crane 2. A pile to be driven into the bedrock 4, for example, a steel sheet pile 5, is attached to the vibrohammer 3 so that vibrations generated from the vibrohammer 3 are transmitted. This steel sheet pile 5 has a striking portion 5B made of a material stronger than the material of the steel sheet pile body 5A, such as carbon tool steel or chromium molybdenum steel, at the lower end of the steel sheet pile body 5A, which is a pile body made of rolled steel for general structural use. It is welded. Several water-conducting vibrators are arranged along the steel sheet pile 5 so that their tips are located at or near the striking portion 5B. This water guiding vibro is attached to the steel sheet pile 5 in a free state, for example, in a vertical direction, and if necessary, can be moved horizontally, and the water guiding vibro has a pressure and water volume that can remove crushed rock from the impact point of the steel sheet pile 5. For example, it is connected to a high water pressure pump 8 so as to inject it from a nozzle 7 at its tip. Also, if we describe an example of a concrete means for attaching the water-conducting vibro along the steel sheet pile 5 so that it can be moved vertically within a predetermined range or horizontally if necessary, the steel sheet pile 5 can be attached as shown in FIG. The steady rest fittings 9 for slidably attaching the water guiding vibro in the longitudinal direction of the main body 5A are installed at predetermined intervals (
i! Set up il.

Then, the water-conducting vibro is attached to the steel sheet pile 5 with a certain amount of margin above by a hanging member 10 such as a wire or chain.
can be attached to. In addition, the nozzle 7 has the role of squeezing the jet water and also the role of a crusher for pushing the water-conducting vibro into the bedrock 4, and since its tip repeatedly hits the bedrock 4, the nozzle 7 is made of a material that will not break. The structure is such that even if the tip is slightly crushed, it will not affect water jetting.

Next, when driving the steel sheet pile 5 into the bedrock 4, a water guiding vibro connected to the high water pressure pump 8 via the hose 8A is attached using the lowering member 10, the high water pressure pump 8 is started, and the nozzle 7 is inspected. After that, the steel sheet pile 5 is erected and the vibrohammer 3 is attached to the end of the steel sheet pile 5.

From this state, as shown in FIG. 3, the high water pressure pump 8 is started, the vibro hammer 3 is started, and the steel sheet pile 5 is driven. During this driving, the vibration from the vibrohammer 3 is transmitted to the steel sheet pile 5, so the tip of the steel sheet pile 5, that is, the striking portion 5B, hits a rock! Hit 84. As a result of this blow, the tip of the striking part 5B crushes the struck portion of the rock 1lL4, and the steel sheet pile 5 is separated from the rock 4 due to the reaction force. At this time, the crushed rock is removed by the water jetted from the nozzle 7 of the water guiding vibro, so when the striking part 5B of the steel sheet pile 5 subsequently hits the rock W4, there is no side cushion and the water guiding vibro is reversed. Even if the jetting force acts, the reverse jetting force does not act on the steel sheet pile 5, so the energy of the steel sheet pile 5 is not reduced and the striking part 5B hits the rock 4, so the rock 4
can be easily crushed.

Further, the nozzle 7 also hits the rock 4 to make a hole, and bites into the rock 4 together with the steel sheet pile 5, so even if the steel sheet pile 5 is driven into the rock 4, it has the same effect as described above.

After forming a predetermined pile hole 11 by the striking part 5B in this manner, the water guiding vibro and the steel sheet pile 5 are sequentially pulled out as shown in FIG.

Next, as shown in FIG. 5, the main pile, that is, the steel sheet pile 12 without a striking part, is inserted into the pile hole 11 while being suspended from the crane 2 and driving the pile with the vibro hammer 3, or without driving the pile. Complete construction.

As described above, the striking portion 5 made of a strong material is preliminarily attached to the tip.
By striking the steel sheet pile 5 having B with the water guiding vibro installed next to it, the pile hole 11 can be formed without deforming or breaking the steel sheet pile 5 itself even when the N value is relatively large. . Furthermore, since the water-conducting vibro is movable in the vertical direction relative to the steel sheet pile 5 and is located next to it, when the steel sheet pile 5 is struck by the vibro hammer 3 against the rock 4 and rebounds, the water-conducting vibro The tip is still near the bedrock 4, and the jetted water hits the striking part 5B against the bedrock 4 to remove the crushed rock, and then, due to the jetting force of the jetted water, the water-conducting vibro jumps up with a delay from the repulsion of the steel sheet pile 5, and this Sometimes, the steel sheet pile 5 falls for the next blow and hits the bedrock 4 again, so that the steel sheet pile 5 and the water guiding vibro can drive the steel sheet pile 5 into the bedrock 4 while repeating the vertical movement alternately. Pile holes 11 can be formed in 11 large rock masses 4.

Furthermore, material costs can be reduced by forming a pile hole 11 with the steel sheet pile 5 having the striking part 5B, pulling it out, and inserting the steel sheet pile 12, which is the main pile, into the pile hole 11. Further, the pile hole 11 is filled with crushed rock powder, and the crushed rock powder can exert a predetermined pulling resistance.

7 to 15 show a second embodiment of the present invention, and the same parts as in the first embodiment are denoted by the same reference numerals, and detailed explanation thereof will be omitted.

As shown in FIG. 7, the striking part 21B with a triangular blade 21A formed at the tip is fixed to the steel mold body 2IC with fixing tools 22 such as rivets, and the water guiding vibro and the plow 1 to the injection pipe 23 are attached to the steel mold 21. , and is lifted by a crane (not shown) and piled with a vibrohammer (not shown), while high pressure water is supplied to the water-conducting vibro. After forming the pile hole 11 as shown in FIG. 8, the water-conducting vibro is handled as shown in FIG. Next, connect the pump (not shown) of the cement milk production device to the grout injection pipe 23 via a hose (not shown), and
．． As shown in FIG. 12, cement milk 24 is filled into the pile hole 11 by the grout injection pipe 23 which is pulled out while pulling the steel mold 21 together. Then, after hanging and erecting the main pile (type &1I25), the 13th.
As shown in Fig. 14, a shaped steel 25 is driven into the pile hole 11 filled with the cement milk 24 using a vibrohammer (not shown), and after the driving is completed, the work is completed.

As described above, the pile hole 11 is formed by driving the shaped steel 21 having the striking part 21B, and after filling the pile hole 11 with cement milk 24, the shaped steel 25, which is the main pile, is driven again. Therefore, even if the N value of the rock 4 is relatively large, deformation and breakage etc. will not occur in the struck gj part 21B.
Can be poured continuously. By roughly filling the pile hole 11 with cement milk 24 and performing grouting, a larger pull-out resistance of the type wA25 can be obtained.

Note that the present invention is not limited to the above-mentioned embodiments, and for example, as shown in FIG.
Various modifications are possible, such as a steel pipe 27 provided with 6.

[Effects of the Invention] The present invention can prevent deformation and damage of the pile when forming a pile hole by providing a water guide pipe on a pile to which a striking part made of a strong material is fixed to the tip, and construction can be carried out in a short time. Material costs can be reduced because the actual pile is re-inserted into the pile hole.

[Brief explanation of drawings]

1 to 6 show the first embodiment, where FIG. 1 is an explanatory diagram of the first step, FIG. 2 is an explanatory diagram of the second step, and FIG.
The figure is an explanatory diagram of the third step, FIG. 4 is an explanatory diagram of the fourth step, FIG. 5 is an explanatory diagram of the fifth step, FIG. FIG. 7 is an explanatory diagram of the first process, FIG. 8 is an explanatory diagram of the second process, and FIG. 9 is an explanatory diagram of the second process.
The figure is an explanatory diagram of the third process, FIG. 10 is an explanatory diagram of the fourth process,
Fig. 11 is an explanatory diagram of the 5th process, Fig. 12 is an explanatory diagram of the 6th process, Fig. 13 is an explanatory diagram of the 7th process, Fig. 14 is an explanatory diagram of the 8th process, and Fig. 15 is an explanatory diagram of the 8th process. A sectional view of the shaped steel, FIG. 16 is a sectional view of another embodiment. 3... Vibro hammer (vibrating pile driver) 4... Rock (hard ground) 5... Steel sheet pile (pile) 5A... Steel sheet pile body (pile body) 5B... Hitting part 6...・Water guiding vibe 11...Pile hole 12...Steel sheet pile (main pile) Patent applicant: Green Kohatsuyo Co., Ltd.
Buried Patent Attorney Ushiki
Figure 7 Figure 12 Figure 13 Figure 9 Figure 10 Figure 11 Figure 14

Claims (1)

[Claims] Consisting of a pile with a striking part stronger than the pile body at the tip of the pile body, and a water guide pipe that is movable in the vertical direction with respect to the pile and is installed adjacent to the pile, the striking part is vibrated. The pile is driven into hard ground by a pile driver to crush the hard ground, and the crushed rocks are removed with water jetted from the water guide pipe to form a pile hole, and then the pile is pulled out. A method for driving piles into hard ground, which is characterized by inserting the main pile into the pile hole.