JPH05112928A - Steel pipe pile column construction method - Google Patents

Abstract

PURPOSE:To make it possible to construct a steel pipe pile column without a hitch even in such a place as space upward of a column construction site is limited, to make unnecessary steel pipe piles with joints and to make it possible to construct a revetment having cut-off effect at a low cost. CONSTITUTION:The force-fit of steel pipe piles 3 having no coupling member projected to the peripheral surface is made up to specific depth at proper intervals, and between adjacent steel pipe piles 3, two steel pipes 4 and 5 having a small diameter are put in both right and left sides on the most accessible position of both steel pipe piles 3 to make the force-fit of them up to the required depth. Mortar 7 is filled into an area 6 surrounded by the steel pipes 4 and 5 having a small diameter and the steel pipe piles 3 on both sides to execute cut-off treatment. According to the constitution, intermediate sections of the steel pipe piles 3 are held, and a revolving force-fit type low space pile driver is utilized to execute the force-fit work of steel pipe piles.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a steel pipe pile column array used for earth retaining walls, revetments, foundations of buildings and the like.

[0002]

2. Description of the Related Art A conventional steel pipe pile column is a steel pipe with a special connecting member in which two connecting members having a C-shaped section or a T-shaped section are fixedly projecting along the axial direction at two radial positions on the outer peripheral surface. A pile, that is, a steel pipe pile sheet pile is used, and the steel pipe pile sheet pile is constructed by press-fitting in a column shape so that adjacent connecting members fit to each other.

[0003]

In the conventional method of using the steel pipe pile sheet pile as described above, the connecting member that largely protrudes from the peripheral surface of the steel pipe interferes and the steel pipe pile itself can be press-fitted while rotating. Since it is not possible, a grounding auger for excavating the ground inside the steel pipe pile sheet pile to be press-fitted is required, and a large pile driver with a long leader that grips the upper end of the steel pipe pile sheet pile and press-fits is required. Therefore, not only is the construction cost high, but there is also the drawback that it cannot be implemented in locations where the space above the column construction site is limited by the piers of the expressway, such as revetment repair work on rivers. there were. Further, since a working operation of welding the connecting member to the steel pipe having a required diameter is required, there is an inconvenience that the steel pipe cannot be used as it is.

[0004]

In order to solve the above-mentioned conventional problems, the present invention press-fits steel pipe piles on the outer peripheral surface of which no connecting member is projected to a predetermined depth at appropriate intervals, Between the adjacent steel pipe piles, two small-diameter steel pipes are distributed to the left and right sides of the closest position of both steel pipe piles and press-fitted to the required depth, surrounded by these two small-diameter steel pipes and the steel pipe piles on both sides. We propose a steel pipe pile column construction method, which is characterized by performing water-stopping treatment such as mortar filling in a closed area.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. In FIGS. 1 and 2, reference numeral 1 represents a steel pipe pile column for a sea wall constructed by the method of the present invention, Reference numeral 2 is a head connecting portion constructed on the upper end of the steel pipe pile column array 1.

In the steel pipe pile column array 1, as shown in FIG. 3, the steel pipe piles 3 on the outer peripheral surface of which the connecting members along the axial direction do not project are press-fitted while rotating at appropriate intervals.
Between the adjacent steel pipe piles 3, two small-diameter steel pipes 4, 5 are distributed to the left and right sides of the closest positions of both steel pipe piles 3 and press-fitted to the required depth. It is configured by filling a mortar 7 in a region 6 surrounded by the steel pipe piles 3 on both sides.

For rotary press-fitting work of the steel pipe pile 3, as shown in FIG. 4, a rotary ring 11 having a chuck 10 is provided below a main body 9 which can be raised and lowered along a vertically standing leader 8. It is possible to use a pile driving machine in which a movable frame 12 for supporting the above is connected by a cylinder unit 13 so as to be able to move up and down. That is, the main body 9 and the rotating ring 1
The steel pipe pile 3 penetrating through 1 is fixed to the rotating ring 11 by a chuck 10, and the main body 9 is lowered with respect to the leader 8 to a height at which the steel pipe pile 3 is supported by the ground. Is fixed to the leader 8, and the rotating ring 11 is rotationally driven by the motor 14 in such a state, and the movable frame 12 is forcibly lowered by the cylinder unit 13, and if the movable frame 12 is lowered to the lower limit position with respect to the main body 9, After the chuck 10 is opened, the movable frame 12 is raised to the upper limit position by the cylinder unit 13, and the operation of fixing the steel pipe pile 3 to the rotary ring 11 by the chuck 10 again is repeated, so that the steel pipe pile 3 is driven to rotate. It is possible to press-fit intermittently for each stroke of the cylinder unit 13.

The steel pipe pile 3 is rotationally press-fitted from the river bed 15 to the required depth D1 as shown in FIG. 1 so as to obtain the required vertical support strength, but when the total length becomes long, a plurality of unit lengths are used. Steel pipe piles are sequentially connected by on-site welding or other methods, and then press-fitted by rotation. Of course, the method of press fitting into this steel pipe pile 3 is
The method is not limited to the above rotary press-fitting method, and depending on the situation, it is also possible to perform press-fitting by a conventional vibro hammer method using a vibrating pile driver, a hollow digging press-fitting method, or the like.

The small-diameter steel pipes 4 and 5 have already been rotationally press-fitted into the two steel pipe piles 3, one by one or two at the same time, and the vibro hammer construction method using a vibrating pile driving machine or the press-fitting construction method using water jet together. Although it is vertically press-fitted with the steel pipe piles 3, it is press-fitted from the river bed 15 to a depth D2 at which the water-stopping effect can be obtained in order to obtain the water-stopping effect between the steel pipe piles 3.
Of course, the upper ends of the small diameter steel pipes 4 and 5 are located at substantially the same level as the upper ends of the steel pipe piles 3.

When filling the mortar 7 into the area 6 surrounded by the two small diameter steel pipes 4 and 5 and the steel pipe piles 3 on both sides, the area 6 is washed with a water jet to discharge mud. Then, as shown in FIG.
The cylindrical bag 16 for mortar filling is inserted therein, and the mortar 7 is filled by the mortar pump in the cylindrical bag 16 for mortar filling. Thus, the mortar 7 is hardened while the peripheral surface of the bag 16 is in close contact with the peripheral surfaces of the small-diameter steel pipes 4 and 5 and the peripheral surfaces of the steel pipe piles 3 on both sides, whereby the desired water blocking effect is obtained. Is obtained.

In FIG. 5, one cylindrical bag 1 for mortar filling is used.
6 shows the state of being inserted into the region 6, but depending on the size of the cross-sectional area of the region 6 or the diameter of the mortar-filling tubular bag 16 to be used, a plurality of mortar-filling tubular forms may be used. The bags 16 will be inserted side by side. or,
The joint use of the mortar-filling tubular bag 16 is to prevent mortar from flowing out from the gap between the two small-diameter steel pipes 4, 5 and the steel pipe piles 3 on both sides. For the area 6 located in the ground below the river bed 15 of No. 1, the area 6 is surrounded by the ground, and there is substantially no risk of mortar flowing out of the area 6. Therefore, the insertion of the mortar-filling tubular bag 16 can be omitted.

Note that the use of the steel pipe pile column constructed by the method of the present invention is not limited to the revetment wall as shown in FIGS. 1 and 2, but when it is used as a revetment wall, it is as shown in FIGS. As shown, the head connecting part 2 can be constructed by reinforced concrete or steel material, and if necessary, a decorative panel 17 for covering the upper outer surface of the steel pipe pile column 1 exposed on the water surface is provided side by side, or the head is connected. A handrail 18 for using the connecting portion 2 as a promenade can also be provided. Further, as the water stop treatment for the region 6 surrounded by the two small diameter steel pipes 4 and 5 and the steel pipe piles 3 on both sides, a method of cleaning and discharging mud and filling the mortar 7 is adopted. When soil exists in the area 6, a method of injecting a hardening agent can be adopted.

[0013]

The method and method of the present invention can be carried out as described above. According to the method of the present invention, a steel pipe pile having no connecting member protruding from the outer peripheral surface is press-fitted. It is not necessary to use an earth auger to excavate the ground inside the steel pipe pile to be press-fitted, and as described in the embodiment, a low space pile driver of the type that grips the middle part of the steel pipe pile and press-fits it by rotation is utilized. Since the steel pipe pile press-fitting work can be performed, the steel pipe pile column can be constructed without any trouble even in a place where the space above the column formation site is limited.

Moreover, between the steel pipe piles, two small-diameter steel pipes are distributed to both steel pipe piles on the left and right sides of the closest position and press-fitted to the required depth, and the two small-diameter steel pipes and the steel pipe piles on both sides are formed. Since water-stopping treatment such as mortar filling is performed in the enclosed area, it is possible to drive the small-diameter steel pipes without any problems even if there are large variations in the intervals between the steel pipe piles, and obtain the desired water-stopping effect. I can.

Further, as the steel pipe pile, a steel pipe having a required diameter can be used as it is, and a small diameter steel pipe having a required diameter can also be used as it is for the water shutoff joint. You can build a seawall.

[Brief description of drawings]

FIG. 1 is a front view of a seawall constructed by the method of the present invention.

FIG. 2 is a vertical sectional side view of the same.

FIG. 3 is a cross-sectional plan view of the main part.

FIG. 4 is a partially cutaway side view for explaining a method for rotationally press-fitting a steel pipe pile.

5 is an enlarged cross-sectional plan view of the main part of FIG.

[Explanation of symbols]

 1 ... Steel pipe pile columns for seawalls 3 ... Steel pipe piles 4, 5 ... Small diameter steel pipes 6 ... Water-stop treatment area 7 ... Mortar 16 ... Mortar filling tubular bag

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Noriyuki Kawabata 2-3-6 Otemachi, Chiyoda-ku, Tokyo Within Nippon Steel Corporation (72) Masahiro Okabayashi 3-2-1 Nakanoshima, Kita-ku, Osaka No. 4 Shin-Nippon Steel Corporation Osaka Branch (72) Inventor Atsushi Shibata 4 Takaya Shinmachi, Ichikawa City, Chiba Prefecture Kubota Ichikawa Plant, Inc. (72) Inventor Ryuji Kakimoto 4 Takaya Shinmachi, Ichikawa City, Chiba Prefecture Kubota Ichikawa Plant, Inc. (72) Inventor Mizuki Mori 1-24-44, Kobayashi Higashi, Taisho-ku, Osaka City Fujii Gumi Co., Ltd. (72) Inventor Kazuhiko Harada 1-2-44 Kobayashi Higashi, Taisho-ku, Osaka City Fujii Gumi Co., Ltd. ( 72) Inventor Chika Fujita 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Yasushi Osawa 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Incorporated (72) Inventor Tetsuo Nagae 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation

Claims (1)

[Claims] 1. A steel pipe pile having no connecting member protruding from the outer peripheral surface thereof is press-fitted to a predetermined depth at appropriate intervals, and two small-diameter steel pipes are inserted between adjacent steel pipe piles at the maximum of both steel pipe piles. Steel pipe piles that are distributed to the left and right sides of the approaching position and press-fitted to the required depth, and water-stop treatment such as mortar filling is performed in the area surrounded by these two small diameter steel pipes and the steel pipe piles on both sides. Column construction method.