JP3014623B2 - Anchor construction method for steel tube column retaining wall - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a retaining wall by connecting steel pipe piles in a column at a construction site. 2. Description of the Related Art As a retaining wall or a partition at a construction site, a retaining wall for connecting and driving steel pipe piles in a column shape has been used.
The retaining wall is formed by connecting steel pipe piles provided with joints along the longitudinal direction on both sides of the steel pipe to each other via joints, and formed into a pillar-column wall shape. I try to oppose. [0003] Since the above-mentioned anchor is generally put through a through hole provided in a steel pipe, it takes time and effort to attach a reinforcing plate to compensate for a cross-sectional defect of the steel pipe. Since the installation position cannot be changed, Japanese Patent Application Laid-Open
A method of driving an anchor through a joint portion of a steel pipe pile has been proposed, as described in JP-A-195526. [0004] In the method described in the above-mentioned publication, it seems that the through-hole can be easily opened on site because the thickness of the joint member is thin, but in practice, it is difficult to work. There are many problems. That is, as shown in FIGS. 2 and 4,
Since the through-hole is opened obliquely downward as a whole so as to be along the anchoring angle of the anchor, the drilling is performed with the cutting tool obliquely downward. In such a case, there is a problem that the drilling operation is difficult, for example, the drilling is difficult because the blade tends to shift when drilling, and a separate means for moving the blade in a predetermined direction is required. . SUMMARY OF THE INVENTION The present invention solves such a problem, and makes it possible to easily and surely make a diagonal hole in a joint portion on site, thereby improving the workability of anchor installation and reducing the construction cost. An object of the present invention is to provide a method for constructing a steel pipe column retaining wall that can be achieved. The structure of the present invention for achieving the above object will be described with reference to the drawings corresponding to the embodiments. The present invention relates to an earth retaining structure formed by connecting steel pipe piles 1 and 1 in a column shape. When the wall A is fixed to the ground B with the anchor 10 whose steel pipes 1 and 1 are connected to each other by the male joint 3 and the female joint 4 and which are connected by fitting the male joint 3 and the female joint 4, the building construction side of the joint 5 After opening a fusing hole 15 in the side plate portion 4a of the female joint 4 exposed to the female joint 4, a drilling blade 16 is inserted into the fusing hole 15, and is advanced obliquely downward, so that the male following the side plate portion 4a, The side plates 3a, 3b, 4b of the female and female joints 3, 4 and the soil cement 7 filled between them are drilled, an obliquely downward insertion hole 8 is opened in the joint 5, and an anchor 10 is driven. It is characterized by doing. In the drilling of the joint 5, a fusing hole 15 is first opened in the exposed side plate 4a of the female joint 4 in the joint 5 by a fusing process. Next, the drilling tool 16 is inserted into the fusing hole 15 while rotating, and the drilling tool 16 is advanced diagonally downward, and the side plates 3a, 3b, 4b and The soil cement 7 filled between them is drilled, and an obliquely downward insertion hole 8 is opened in the joint portion 5. In drilling with the drilling tool 16, the fusing hole 15 acts as a guide for the drilling tool 16, and the layer of soil cement 7 prevents the drilling tool 16 from slipping or shifting due to drilling. And drilling in an oblique direction is performed easily and reliably. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan sectional view showing an embodiment of a steel pipe column retaining wall constructed according to the present invention, FIG.
FIG. 5 is an enlarged vertical cross-sectional view showing a procedure for forming the anchor insertion hole in FIGS. 3 and 4. In FIGS. 1 and 2, reference numeral 1 denotes a steel pipe pile used for a steel pipe column retaining soil wall.
A small-diameter male joint 3 and a rectangular female joint 4 for connecting the steel pipe piles 1 and 1 are fixed by welding along the longitudinal direction of the steel pipe 2, and the male joint 3 is a tip of the female joint 4. The steel pipe piles 1 and 1 are connected to each other by fitting into the sections. The above-mentioned steel pipe pile 1 is laid down while being connected with a large number of the above-mentioned joints 3 and 4 while filling the soil cement 7 by continuously making the excavation holes 6 and 6 in the ground. A is formed. Thereafter, the ground on one side, which is the building construction side, is dug down and exposed, and insertion holes 8, 8 are opened at predetermined positions of the joint portion 5 where the joints 3, 4 are fitted.
A guide tube 9 is placed, and an anchor 10 is placed through the guide tube 9 to the depth of the ground B, and a chemical solution is injected to anchor the guide tube 9.
Fix 10 and stop water. Then, the base end of the anchor 10 is passed through the mounting seat 12 locked to the flared members 11, 11 arranged in contact with the steel pipe piles 1, 1, and the nut 13 is screwed and tightened. As shown in FIGS. 2 to 4, each of the above-mentioned insertion holes 8 is provided obliquely downward so as to be along an anchor 10 which is installed so as to be inclined so that the front side becomes lower. In opening the insertion hole 8, first, as shown in FIG. 3, a predetermined shape of a fusing hole 15 is formed on the exposed plate portion 4 a of the female joint 4 using a gas fusing torch 14. Form. Next, as shown in FIG. 4, by using a drilling tool 16 and inserting it into the fusing hole 15 and moving it forward in a predetermined diagonal direction while rotating it, the side plates 3 a and 3 of the male joint 3 are rotated.
b and the back side plate portion 4b of the female joint 4 are sequentially drilled, and the soil cement 7 between the side plate portions 4a, 3a, 3b, 4b is deleted, and the insertion hole 8 is opened. Become. In this case, the drilling operation by the drilling blade 16 is performed by inserting the drilling blade 16 into the already opened fusing hole 15. The hole hits the soil cement layer exposed by the formation of the first fusing hole 15, so that the drilling tool 16 is prevented from slipping and shifting in the transverse direction, and the efficiency is as easy and reliable as in normal drilling work. You can work well. As the drilling tool 16, an annular tool rest having a diameter corresponding to the hole to be drilled and having a super-hard tip such as diamond fixed to the front end face is used. If possible, as shown in FIG. The tip of the turret 17 to which the super-hard tips 18, 18 are fixed is a composite of cobalt and tungsten carbide.
If you use a drilling tool 16 with 19 deposited by overlay welding,
Drilling work can be performed more easily and more efficiently. In addition, the durability of the pit is improved, the cost is reduced, and on-site repair is also possible. The structure of the joint portion 5 for connecting the steel pipe piles 1 and 1 is not limited to the above embodiment.
A conventionally known joint formed by fitting a male joint and a female joint is widely used. As described above, according to the present invention, when an anchor insertion hole is formed in a joint portion for connecting steel pipe piles, first, the exposed side plate portion of the joint member is cut by fusing. A hole is drilled, and then a drilling tool is inserted from the fusing hole and moved forward to drill a hole, so that the obliquely downward anchor insertion hole by the drilling tool almost causes slippage and displacement of the drilling tool. Thus, the cutting can be performed smoothly and reliably without any trouble, and the work at the site can be easily and efficiently performed, and the cost can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan sectional view showing an embodiment of a retaining wall according to the present invention. FIG. 2 is a side sectional view of the same. FIG. 3 is an explanatory sectional side view of opening a fusing hole in a joint portion of a steel pipe pile. FIG. 4 is an explanatory side sectional view of opening of an insertion hole by the drilling blade. FIG. 5 is a side view of a main part showing an embodiment of a drilling tool. [Description of Signs] A Steel Pipe Column Retaining Wall B Ground 1 Steel Pipe Pile 2 Steel Pipe 3 Male Joint 3a, 3b Side Plate 4 Female Joint 4a, 4b Side Plate 5 Joint 7 Soil Cement 8 Insertion Hole 9 Guide Pipe 10 Anchor 11 Belly Raising material 12 Mounting seat 14 Torch 15 Fusing hole 16 Drilling tool

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E02D 5/02-5/20 E02D 17/04

Claims (1)

(57) [Claims] A retaining wall formed by connecting steel pipe piles in a column-shape is fixed to the ground by an anchor penetrating through a joint portion where the steel pipes are connected by fitting a male joint and a female joint. Upon fixing, after opening a fusing hole in the side plate portion of the female joint exposed on the building construction side of the joint portion, insert a drilling blade into the fusing hole and advance forward diagonally downward, The male following the side plate,
The side walls of the female and female joints and the soil cement filled between them are drilled, diagonally downward insertion holes are opened in the joints, and anchors are installed, characterized by the steel pipe column soil retaining wall. Anchoring method in Japan.