JPH058298B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a construction method for removing existing piles buried underground of an existing building when a new building is constructed by demolishing the existing building.

Conventional technology Conventionally, in order to remove an existing water pile, (1) as shown in Figures 5a to 5c, a steel pipe B is welded to the tip of the sheet pile A, and a mounting wire is attached to the upper edge of the steel pipe B. A sheet pile constructed in such a way that C is fastened with a wire D, the other end of the mounting wire C is passed through a hole E provided at one end to form a ring F, and the ring F is tightened by pulling and squeezing the other end. Place the steel pipe B of A over the head of an existing wooden pile G such as a pine pile, and use a vibron hammer to penetrate the sheet pile A into the ground along the wooden pile G, and connect the wooden pile G and the ground with the steel pipe B. When the steel pipe B reaches the tip of the wooden stake G, pull up the mounting wire C and the wire D will break, so tighten the wooden stake G with the loop F of the mounting wire C and leave it as it is. (2) Place the steel pipe over the head of the existing wooden pile, and rotate the bladed screw installed inside the steel pipe to scrape off the wooden pile from the head to shorten the tip of the wooden pile. (3) The casing used for the Benoto pile is press-fitted using hydraulic pressure, the cutting edge of a hammer grab is opened and dropped into the casing, the ground at the bottom of the hole is crushed, the bottom of the casing is excavated, and the wooden pile is split and removed. The method used was to either go down to the bottom of the hole, hang a wire, pull it out, and remove it.

Problems to be Solved by the Invention In the method (1) above, the ground around the pulled out pile moves to block the hole, causing the surrounding ground to sink due to the vibration of the vibron hammer, and There are problems with the vibration caused by the hammer, which has a negative impact on the surrounding environment, and with method (2), there are problems with the slow cutting speed of the wooden piles, which takes a long time, and if there are jointed piles, it is difficult to connect them. There are problems in that construction cannot be carried out because the metal parts damage the screw blade, and in method (3), the casing press-fitting device extends to the outside of the casing, so construction cannot be carried out to the very edge of the site, and the wooden piles inside the casing cannot be used. It takes time to process the casing, the dropping of the hammer grab causes vibration and noise, which has a negative impact on the surrounding environment, and when the casing is press-fitted, the diameter of the cutting edge at the tip of the casing is larger than the diameter of the casing, so it is difficult to pull the casing out. When the surrounding ground collapses and causes ground subsidence, the ground subsidence can cause damage to gas and water pipes, especially when the excavation hole is close to the site boundary and gas and water pipes are installed in the surrounding area. There was a problem that caused this.

Means for Solving the Problems In order to solve the above-mentioned problems, the means of the present invention is to use a hydraulic grab bucket 4 provided with a cutting blade 8 inside the excavation claw 6 to create a groove in the planned removal position of the existing pile.
2, and after reaching the buried existing pile 9, the existing pile 9 is cut by the cutting blade 8 by repeating the operation of opening and closing the hydraulic grab bucket 4, and the existing pile 9 is removed. This method consists of removing existing piles.

Embodiment An embodiment of the present invention will be described with reference to the drawings.

Figure 1 shows a side view of the hydraulic bucket device, and Figure 2 shows its front view.
After lowering the hydraulic grab bucket 4 suspended by a wire 3 from the crown block 2 to the ground where the existing pile is to be removed, the hydraulic grab bucket 4 is opened and closed by the hydraulic cylinder 5, and the excavation claw 6 is used to dig into the ground 7. As shown in FIGS. 3 and 4, a cutting blade 8 is provided inside the digging claw 6 of the hydraulic grab bucket 4 at a position between the digging claws 6, 6, and the hydraulic grab bucket 4 is excavated. When opened and closed, the excavating claws 6 engage with each other and at the same time the cutting blades 8 also engage with each other on the inside thereof to cut a stake 9, such as a pine stake, sandwiched between the hydraulic grab buckets 4. In the figure, 10 is a rod connecting the hydraulic cylinder 5 and the hydraulic grab bucket 4, and 11 is a stabilizing plate.

To remove the existing pile, use the hydraulic grab bucket 4 to excavate a groove 12 in the ground 7 from above the planned removal location of the existing pile where the pile 9 is buried, as shown by the two-dot chain line in Figure 1. Fill the stabilizer 13 with the ground 7
to prevent the collapse of When the hydraulic grab bucket 4 hits an existing buried pile 9 during excavation, the hydraulic grab bucket 4 closes, and even the pile 9, which is in a slightly lopsided position, is brought to the center and then cut by the cutting blade 8. Ru. A large number of stakes 9 in the groove 12
If such a pile is present, all the piles 9 in the burial area can be cut by repeatedly opening and closing the hydraulic grab bucket 4. When the length of the cut pile 9 is short (2 to 5 m), it can be removed by holding it in the hydraulic grab bucket 4 and pulling it out.

After completing the removal of all the existing buried piles 9 by repeatedly opening and closing the hydraulic grab bucket 4 in this way, the stabilizing liquid 13 is solidified with cement, etc., and backfilling is performed to complete the removal work of the existing piles. do. Therefore, it can be used as a continuous underground wall or cast-in-place concrete pile when constructing structures.

Note that in the above case, wooden piles such as pine piles were explained as the existing piles, but reinforced concrete piles can be constructed in the same way.

Effects of the Invention This invention uses a simple device consisting of a hydraulic grab bucket with a width equal to the width of the trench to be excavated, suspended by a crawler crane, so it is possible to excavate up to the site boundary. Furthermore, since excavation is performed using a hydraulic grab bucket, construction can be carried out safely without ground collapse or subsidence due to vibration, even if gas pipes or water pipes are installed around the site, and it is environmentally friendly as there is no vibration or noise. It can be applied even in urban areas as it does not have any negative impact on the environment.

In addition, because it cuts the piles, the removal speed of the pillars is faster than when cutting the piles with a screw with a blade, and even if the piles are bent, all the piles in the groove can be cut, and even if the piles are bent, all the piles in the groove can be cut. However, since the fittings can be cut while avoiding the fittings, the construction will not become impossible.

[Brief explanation of drawings]

1 to 4 show an embodiment of the present invention, in which FIG. 1 is a side view of the hydraulic grab bucket device, FIG. 2 is a front view thereof, and FIG. 3 is a partial view of the hydraulic grab bucket device from below. FIG. 4 is a front view cut along the - line in FIG. 3, FIGS. 5a to 5c show the conventional method, and FIG. 5a is a cutaway plan view, and FIGS. 5b and 5c. is a front view. 4...Hydraulic grab bucket, 6...Drilling claw, 8
...cutting blade, 9...pile, 12...groove.

Claims (1)

[Claims] 1. A groove 1 is cut at the location where the existing pile is scheduled to be removed using a hydraulic grab bucket 4 with a cutting blade 8 provided inside the excavation claw 6.
2, and after reaching the buried existing pile 9, the existing pile 9 is cut by the cutting blade 8 by repeating the operation of opening and closing the hydraulic grab bucket 4, and the existing pile 9 is removed. A construction method for removing existing piles.