JPH02274992A - Method and device for excavating pile hole - Google Patents

Abstract

PURPOSE:To crush an existing structure in a pile hole by a method wherein a cylindrical casing is perpendicularly supported to a press fitting device, a crushing rod provided at its tip with a crushing blade is mounted in the casing, and a rotation force and a pressurizing force are exerted on the casing. CONSTITUTION:A casing 10 is provided at its lower end with a cylinder tip member 10b having an excavating blade 14 and a plurality of casing members 10a. A crushing head 16 is mounted to the tip of a square shaft 15 of a crushing rod 11 and a saw toothed crushing blade 17 is provided, and a screw 18 is mounted to the upper part of the blade 17. In this case, the square shaft 15 is inserted in a square hole 12a, and secured to a rod mounting member 12 by means of a pin 19. When the tip of the casing 10 is lowered to an embedded substance 20, a crushing rod 11 is secured in the casing 10, and a rotation force and a pressurizing force are transmitted to the rod 11 through a rod mounting member 12 by means of a press fitting device 13. This constitution crushes the embedded substance.

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention is used in civil engineering work, construction work, etc. to drill pile holes for foundation pile driving in places where existing structures and buried objects such as existing piles remain by using a casing. The present invention relates to an excavation method and apparatus for excavating. [Conventional technology] Conventionally, in civil engineering work, building construction work, etc., a method of excavating a pile hole for foundation pile driving using a casing,
As shown in Fig. 3, a cylindrical casing] is supported by the press-fitting device 2 and set vertically at the location where the pile hole is excavated. A method is known in which the casing I is press-fitted into the ground by applying rotational force and pressurizing force to the casing I using the press-fitting device 2 described above. However, this method does not pose a problem when the target is a location where it is possible to excavate with a hammer grab 3, but 1. In such cases, excavation with a hammer grab is difficult, making construction difficult. Therefore, in the past, the entire underground section was excavated once, all old buried materials were removed, and then backfilled to the construction ground, and then the above-mentioned I was trying to dig a pile hole using the method. Therefore, there was a drawback that construction required a great deal of effort and time, and the cost was also high. [Problem to be solved by the invention] The problem of the present invention is that even if existing structures or buried objects such as existing piles remain underground, it is possible to use a casing to drive foundation piles from above. The purpose is to make it easier to drill pile holes. [Means for Solving the Problems] In order to solve the above problems, the method of the present invention includes installing a casing press-fitting device at a piling site where existing structures and existing piles are buried, and By vertically supporting a cylindrical casing, inserting and fixing a crushing rod with a crushing blade at the tip inside the casing, and applying rotational force and pressurizing force to the casing with the press-fitting device, This method is characterized in that a crushing rod is driven through the casing, and the casing is press-fitted while crushing the existing structure with a crushing blade at the tip of the crushing rod. The device of the present invention also includes a cylindrical casing for press-fitting into the ground, a square hole for fitting a crushing rod, a rod attachment member that is detachable from the casing, and an existing structure at the tip of the square shaft. The crushing rod is equipped with a crushing blade for crushing objects, and the square shaft is fitted into the square hole of the rod mounting member to apply rotational force and pressurizing force to the crushing rod installed inside the casing and the casing. The invention is characterized in that it has a press-fitting device for making a press fit. C Embodiment Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows the configuration of an excavation device according to the present invention, which includes a cylindrical casing 1 for press-fitting into the ground.
0, a crushing iron 11 which is removably attached to the inside of the casing 10 by a rod attachment member 12, and a press-fitting device 13 which applies rotational force and pressurizing force to the casing 10. The casing lO is a cylindrical casing member 1.
A cylindrical tip member 10b having a serrated cutting blade 14 on the tip edge is attached to the lower end of the casing 0a, and a plurality of casing members 10a, 10a are sequentially attached depending on the depth of the casing 10. By connecting them, their length can be adjusted. On the other hand, the crushing rod 11 has a crushing head 18 attached to the tip of a square shaft 15 having a square cross section. The crushing head 16 is equipped with a serrated crushing blade 17 at the lower end for crushing existing structures, and the crushing blade 17
It is equipped with a screw 18 for scraping up the crushed material on the upper part of the crushing blade.

[7 is the cutting edge of the crushing rod 1
It is formed in a centrosymmetric shape toward the direction of rotation of the rotation direction. Moreover, the square shaft 15 of the crushing rod 11 is inserted into the square hole 12a of the rod attachment member 12 detachably attached to the top of the casing 10, and is fixed to the rod attachment member 12 by a pin J9. Accordingly, the crushing iron 11 is attached inside the casing 10 with the crushing blade 16 positioned at the lower end of the casing 10. The length of the square shaft 15 can be freely adjusted according to the length of the casing IO by connecting or separating the plurality of square shaft members 15a. Further, the press-fitting device 13 of the casing 10 uses hydraulic pressure to hold the periphery of the casing 10, and in that state, the casing! The press-fitting device 13 is of a type in which rotational force and pressurizing force are applied to the press-fitting device 13, and a conventionally known press-fitting device 13 can be used. Next, a method for excavating a pile hole using the excavating device having the above configuration will be described. First, as shown in FIG. 2(A), a press-fitting device I3 is installed in a predetermined pile-driving pit where buried objects 20 such as existing structures and existing piles are buried.
0 is supported vertically and set. If there is a distance to the buried depth of the existing buried object 20, the press-in device 1 excavates and discharges to that depth with the hammer grab 21.
Press-fit the casing 10 in step 3. When the tip of the casing 10 reaches the existing buried object 20, as shown in FIG. 2(B), the crushing rod 11 is inserted into the inside of the casing 10, and the casing 10
A loft attachment member 12 is fixed to the upper end of the rod attachment member 12, and the square shaft 15 of the crushing port 11 is inserted into the square hole 12a of the rod attachment member 12 and fixed with a pin 18 (see FIG. 1). When a rotational force and a pressing force are applied to the casing 10 by the press-fitting device 13, these rotational force and pressing force are transmitted from the casing 10 to the crushing rod 11 via the rod receiving part 12. The crushing blade 16 at the tip of the crushing rod 11 crushes the concrete, reinforcing steel, etc. of the existing buried object 20, and the crushing blade 0 is press-fitted together with the crushing. If there is no distance from the ground surface to the burial depth of the existing buried object 20, first excavation using the above-mentioned hammer grab,
It is possible to crush the buried object 20 and press-fit the casing 10 using the crushing rod 11 from the beginning without removing the earth. After the press-fitting of the casing 10 is completed, the rod mounting member]
2 is removed, and as shown in FIG. 2(C), the square shaft work 5 of the crushing rod 11 is newly connected to the square shaft members 15a-t to make it longer, and the press-fitted casing 10 is replaced with a new casing member. 10a are connected to make it longer, and a rod attachment member 12 is attached to the upper end of the rod attachment member 10a to fix the casing 10 and the crushing rod 11 again. Then, press-fit device 13 again
By applying rotational force and pressing force to the casing IO, the casing 10 is press-fitted while crushing the existing buried object 20 with the crushing blade 1B at the tip of the crushing rod 11. In this way, the casing 10 and the crushing rod 11 are successively added and press-fitted repeatedly, and after the casing 10 is press-fitted to a predetermined depth while locally crushing the existing buried object 20, the rod attachment member 12 and the crushing rod 11 are removed. By discharging the crushed material remaining inside the casing 1(l) with the hammer grab 21, the construction of the casing 1o is completed as shown in FIG. 2(D).Next, as shown in FIG. 2(E) As shown in FIG. 2, a reinforcing bar 23 is inserted into the erected casing member, a tremie pipe 24 for pouring concrete is inserted into the reinforcing bar 23 (see FIG. 2 (F)), and the tremie pipe 24 is inserted into the reinforcing bar 23. 21 (see Fig. 2 (G)). When the concrete pouring is finished, as shown in Fig. 2 (H), the press-in device 13 and the casing 1o are pulled out one after another while rotating, and the press-in device 13 is removed, and once the removal is finished, pile driving is completed. (See Figure 2 (1)) [Effects of the Invention] As described above, according to the present invention, even if buried objects such as existing structures and existing piles remain underground, the buried objects can be removed. The casing can be simply and reliably press-fitted after locally crushing the buried object with a crushing rod without removing the entire thing. Furthermore, since the crushing rod is configured to be driven through the casing by simply attaching the crushing rod to the casing and applying rotational force and pressurizing force to the casing using a press-fitting device, there is no need to separately provide a means for driving the crushing rod. Pile holes can be easily drilled in areas where there are existing buried objects using conventional press-in equipment. Furthermore, the casing and the crushing rod are connected by detachably attaching the rod attachment member to the casing and fitting and fixing the square shaft of the crushing rod into the square hole of the rod attachment member. The structure is very simple, and the work of press-fitting the casing and crushing rod in sequence can be done easily and quickly. Moreover, since a very large force can be reliably transmitted by fitting the square hole and the square shaft, damage to the device will not occur.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the excavation device of the present invention, FIGS. The figure is a sectional view showing a conventional pile hole drilling method. 10・φ Casing, 11・Crushing rod, 12・
- Rod mounting member, 12a - Square hole, 13... Press-fit device. 15... Square shaft, 17... Crushing blade, 20 buried objects. Patent applicant Sato Enterprise Co., Ltd. Figure 2 (A) Figure 2 (B) Figure (G) Figure (E) Figure (F)

Claims (1)

[Claims] 1. A casing press-in device is installed at a piling location where existing structures and existing piles are buried, and the cylindrical casing is vertically supported by the press-in device, and the casing is A crushing rod with a crushing blade at the tip is inserted and fixed into the inside of the casing, and the press-fitting device applies rotational force and pressurizing force to the casing to drive the crushing rod through the casing. A pile hole excavation method characterized by press-fitting a casing while crushing an existing structure with a crushing blade at the tip of the pile hole. 2. Equipped with a cylindrical casing for press-fitting into the ground, a square hole for fitting a crushing rod, a rod attachment member that can be attached to and detached from the casing, and a square shaft at the tip for crushing existing structures. A crushing rod equipped with a crushing blade and installed inside the casing by fitting the square shaft into a square hole of a rod mounting member; and a press-fitting device that applies rotational force and pressurizing force to the casing. A pile hole drilling device comprising: