JPH10102483A - Steel-pipe-sheet pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the penetration of soil and sand into a female side joint surely without damaging the workability of a steel-pipe-sheet pile when the steel-pipe-sheet pile is sunk. SOLUTION: The inside of a female side junction 2 is filled beforehand with a rod-shaped body 5 consisting of foamed styrene, foamed vinylidene, etc., before the steel-pipe-sheet pile is sunk, the steel-pipe-sheet piles 1 are sunk along the beforehand driven steel-pipe-sheet piles 1, soil and sand are not penetrated into the female side junction 2, and the sheet piles are cut and torn easily in a male side junction 3 and compressed when the next steel-pipe-sheet piles 1 are sunk. A plurality of studs are mounted to the female side junction 2, and floating by buoyancy of the rod-shaped body 5 placed at a section lower than a groundwater level is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel pipe joint for preventing earth and sand from entering into a female joint of a steel pipe sheet pile when the steel pipe sheet pile is laid down.

[0002]

2. Description of the Related Art A technique for preventing earth and sand from entering a joint on the female side of a steel pipe sheet pile when the steel pipe sheet pile is laid down is disclosed in Japanese Unexamined Patent Publication No. Sho 54 (1994).
JP-A-125816, JP-A-55-71744, JP-A-55-136328, and Japanese Utility Model Application Laid-Open No. 3-86.
Various applications have been filed, such as JP-A-133, JP-A-7-29017. These documents disclose various countermeasures, such as a lid at the lower end of the joint, a tip below the lower end of the joint, and a seal lid at the joint slit.

[0003]

However, the conventional measures as described above do not sufficiently prevent the intrusion of sediment into the female joint. In particular, the intrusion of sediment in sand layers and gravel layers below the groundwater level is not sufficient. Could not be prevented. Also, the resin lid provided on the slit cannot withstand the earth pressure,
There was a defect that the lid came off and the earth and sand penetrated into the joint, failing to achieve its purpose.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to reliably prevent earth and sand from entering a joint without impairing workability of a steel sheet pile. It is to provide a steel pipe sheet pile which can be manufactured.

[0005]

According to the present invention, a female pipe joint is filled with a rod-like solid before the steel pipe sheet pile is laid, and the steel pipe sheet pile is laid down along the already installed steel pipe sheet pile. The rod-shaped solid material prevents earth and sand from entering the female joint. The rod-shaped solid may be inserted into the female joint, or a rod-shaped solid may be formed by injecting a material into the female joint.

[0006] The solid is formed of a material that is weak against shearing force and has compressibility. For example, when molding or molding a foamed resin such as styrene foam or vinylidene foam, and fitting the male joint of the next steel pipe sheet pile into the female joint filled with solids, the lower end of the male joint To be more easily torn and compressed.

[0007] A plurality of metal fittings for locking the bar-shaped solid are arranged on the female joint to prevent the bar-shaped solid located below the groundwater level from floating due to buoyancy. The metal fittings may be arranged between the bar-shaped solids, or may be arranged between a plurality of continuous short bar-shaped solids. This fitting is also sheared by the lower end of the male joint.

At the lower end of the steel pipe sheet pile, a chip is provided at a position below the extension of the female joint to guide the earth and sand hitting the passage of the female joint into the steel pipe sheet pile at the time of sinking, and the ground resistance received by the female joint is reduced. lose.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in the drawings. This is an example applied to a CC type junction steel sheet pile. 1 and 2 show an example of a steel sheet pile according to the present invention. FIG. 3 to FIG. 5 show a mounting state of a rod-shaped stopper made of a foamed resin or the like. FIG. 6 shows an example of joining upper and lower steel pipe sheet piles. FIG. 7 shows various junctions of the steel pipe sheet pile.

In FIG. 1, female junctions 2 are provided on the left and right of an intermediate portion excluding upper and lower ends of a steel pipe sheet pile 1, respectively.
And the male junction 3 are attached in parallel with the longitudinal direction of the steel sheet pile, and the tip 4 is attached to the lower end of the steel sheet pile 1 at the lower end of the sheet pile wall at a position below the extension of the female junction 2 (see FIG. The hollow portion of the female junction 2 of each steel pipe sheet pile 1 is filled with a styrofoam rod 5 inserted therein (see FIGS. 1 and 6).

When the steel sheet pile 1 is laid down along the already piled steel sheet pile, the tip tip 4 removes the earth and sand hitting the path of the female junction 2 in advance in order to cancel the ground resistance received by the female junction 2. It is guided into the sheet pile 1 and has substantially the same cross-sectional area as the closed cross section of the female junction 2, and further has a lower end face protruding from the lower end face of the steel pipe sheet pile and is inclined toward the inside of the steel pipe sheet pile.
In the case of a steel pipe sheet pile as the first sheet pile wall, as shown in FIG. 2, the tip 4 is similarly provided below the male side junction 3 to reduce the penetration resistance.

The rod-shaped body 5 prevents earth and sand from entering the female junction 2 when the steel pipe sheet pile 1 is laid, and is easily cut by the male junction 3 when the next steel pipe sheet pile 1 is laid. Styrofoam is preferable because it is required to be compressed and processed in advance, and the Styrofoam is previously formed into a rod shape or processed and formed, and the outer diameter thereof is a diameter that can be inserted into the hollow portion of the female junction 2. Is about 1 to 5 mm. Further, the length is made short, about 1 to 2 m, and a plurality of these are inserted into the female side junction 2, and the inside of the female side junction 2 is almost completely filled with styrofoam. If the outer diameter of the rod 5 is substantially the same as the inner diameter of the female junction and there is not much clearance, it becomes difficult to insert the rod. If the clearance is too large, earth and sand may enter the clearance. However, when the next steel pipe sheet pile is driven, intrusion of earth and sand that does not hinder junction fitting is allowed.

The material of the rod 5 is not limited to Styrofoam, but may be any material that is weak against shear and has compressibility and can be molded or molded into a rod. For example, a bag-like body formed of a foamed resin such as vinylidene foam or a material such as peat moss (corroded soil for horticultural use) or a granular material may be packed in a bag. In any case, it is desirable that the material be easy to handle.

A steel pipe sheet pile 1 filled with a rod 5 is laid down in the female junction 2. When the styrofoam rod 5 is positioned below the groundwater level, the rod 5
Since the buoyancy may act on the female side, the metal fittings 6 are attached to the female junction 2 in order to prevent the floating. As shown in FIGS. 3 to 5, the stopper 6 is attached using the slit 2 a of the female junction 2. That is, the tip of a straight or L-shaped steel rod is inserted into the slit 2a from outside, and the base is fixed to the end face of the slit 2a or the outer face of the female junction 2 by welding.

The metal fittings 6 are attached by welding to the rod-shaped body 5.
At the same time as the insertion work into the female side junction 2,
It is performed so as to be located between the rods. Stopper 6
It is preferable to arrange a plurality of rods 5 continuously between the metal member and the stopper 6 from the viewpoint of workability. However, since styrene foam is weak against shearing force, when the mounting pitch of the stopper 6 is increased, In some cases, the styrofoam is sheared by the buoyancy of a large number of the rods 5 and floats up. Therefore, in consideration of this point, it is necessary to determine the mounting pitch and the width of the metal fitting 6 in consideration of this point. Usually 3 ~
Use 5m mounting pitch and use rebar.

The fitting 6 is sheared at the lower end of the male-side junction 3 when the male-side junction 3 of the next steel-sheet pile is fitted to the female-side junction 2 of the steel pipe sheet pile after the casting. And must be strong enough to be easily sheared. Normally, a reinforcing bar having a diameter of about 6 mm that can withstand welding and is easily sheared is used. Note that the lower end of the male junction 3 is required to have a function of shearing the stopper 6 and a function of tearing the styrofoam. Therefore, a knife 7 as shown in FIGS. 1 and 8 is provided at the lower end of the male side junction 3 of the lowermost steel pipe sheet pile 1 (not necessary for the steel pipe sheet pile of FIG. 2). Although there are various types of junctions as shown in FIG. 7, as shown in FIG. 8, a plurality of junctions are attached to a portion located in the female junction 2.

FIG. 6 shows an example in which the upper and lower steel pipe sheet piles 1 are joined. Since there are no junctions 2 and 3 at the upper and lower ends of the steel pipe sheet piles 1, the connecting junctions 12 and
13 is used. Also in this case, the styrofoam rod 5 is filled in the female connection junction 12. After the upper steel pipe sheet pile 1 is suspended on the lower steel pipe sheet pile 1 and the joining ends are joined by welding, the connecting junctions 12 and 13 are attached to this joint by welding.

A stopper 6 is also attached to the lower end of the steel sheet pile 1 so that the rod 5 does not fall when the steel sheet pile is lifted. However, since the lid 8 is attached to the lower portion of the female junction 2 of the lowermost steel pipe sheet pile 1 having the tip 4 (see FIGS. 1 and 6), the stopper 6 is not required. The lifting of the rod-shaped body 5 of the female connection junction 12 can be prevented by the stopper 6 at the lower end of the upper female junction 2.
It is only necessary to provide the stopper 6 at the lower end of 2 for drop prevention.

In the above-described configuration, the operation of inserting the rod 5 and the operation of attaching the stopper 6 may be performed on site or in a factory. Perform subsidence. As the laying method, a striking method or a middle boring method is adopted. In the middle boring method, the lower end may be solidified with cement milk, concrete, or the like after the steel pipe sheet pile is laid.

(1) At a factory or site, a metal bar 5 is inserted and filled into the female junction 2 of the steel pipe sheet pile 1, and a stopper 6 is attached to the slit 2a at a predetermined pitch.

When the steel pipe sheet pile 1 is laid down, when the steel pipe sheet pile 1 is lifted, the stopper 6 prevents the rod 5 from dropping.

(2) The steel pipe sheet pile 1 is sunk along the steel pipe sheet pile that has already been driven. At this time, earth and sand in a portion corresponding to the closed cross section of the female junction 2 are guided into the steel pipe sheet pile by the tip 4, the ground resistance received by the female junction 2 is eliminated, and the filled rod-like body 5 is used to fill the female junction. Intrusion of earth and sand into the junction 2 is completely prevented. Even if it is cast to a predetermined depth and the buoyancy acts on the styrofoam rod 5 in the female junction 2 by the groundwater, the floating is prevented by the stopper 6 so that earth and sand do not enter.

(3) The male junction 3 of the next steel pipe sheet pile is fitted into the female junction 2, and the knife 7 at the lower end of the male junction 3 cuts the styrofoam rod 5 and stops it. The steel pipe sheet pile 1 is sunk while shearing the steel 6. Since there is no earth and sand in the female side junction 2, the laying can be performed easily and quickly.

Although the method of inserting the formed rod 5 into the female junction 2 has been described above, the rod 5 may be formed by injecting a foamed resin into the female junction 2. Good. In this case, there is an advantage that the rod-shaped body 5 can be formed in the female junction 2 without a gap, and a stopper is not required.

[0025]

Since the present invention has the above configuration, the following effects can be obtained.

(1) Since the rod-like solid material is filled in the female joint of the steel pipe sheet pile, the earth and sand do not enter into the female joint when the steel pipe sheet pile is settled, and the work of the steel pipe sheet pile is facilitated.

(2) Since the solid matter is easily sheared and compressed at the lower end of the male-side joint, it does not hinder the fitting of the male-female joint and impairs the workability of the steel sheet pile. Absent.

(3) By using a foamed resin such as styrene foam or vinylidene foam as a solid, it is light in weight and easy to handle, and can be easily sheared and compressed.

(4) By arranging the stopper on the female joint, it is possible to prevent solid matter from falling when the steel pipe sheet pile is lifted, and to prevent the solid matter such as foamed resin from being located below the groundwater level. It is possible to prevent the solid from rising due to buoyancy. Further, by disposing the stoppers at an appropriate pitch, it is possible to prevent solids such as foamed resin from being sheared by the stoppers and rising.

(5) A tip is provided at a position below the extension of the female joint to guide the soil corresponding to the closed cross section of the female joint into the steel sheet pile, thereby reducing the penetration resistance when the steel pipe sheet pile is laid. This can be reduced, and the workability of the steel pipe sheet pile can be improved in combination with the prevention of earth and sand from entering the female joint.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a steel pipe sheet pile of the present invention (a steel pipe sheet pile which is laid along a steel pipe sheet pile that has already been cast).

FIG. 2 is a perspective view showing an embodiment of a steel pipe sheet pile (a steel pipe sheet pile to be laid in the first sheet) of the present invention.

FIG. 3 is a perspective view showing a rod-shaped body made of a foamed resin or the like of a steel pipe sheet pile of the present invention and a fastener (straight);

FIG. 4 is a front view of a female junction in FIG. 3;

FIG. 5 is a perspective view showing a rod-shaped body made of a foamed resin or the like of a steel pipe sheet pile of the present invention and a metal fastener (L-shape) thereof.

FIG. 6 is a perspective view showing the upper and lower joints of the steel pipe sheet pile of the present invention.

FIG. 7 is a plan view showing various junctions of a steel pipe sheet pile.

8A and 8B show a lower end portion of a male junction of a steel pipe sheet pile, where FIG. 8A is a perspective view, and FIGS. 8B and 8C are plan views.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Steel pipe sheet pile 2 ... Female side junction 2a ... Slit 3 ... Male side junction 4 ... Tip chip 5 ... Bar-shaped body 6 ... Stopper 7 ... Knife 8 ... Lid

Claims (6)

[Claims] 1. A steel pipe sheet pile characterized in that a female solid joint is filled with a rod-like solid material. 2. A steel pipe sheet pile according to claim 1, wherein the solid material is formed of a material that is weak against shearing force and has compressibility. 3. The steel pipe sheet pile according to claim 1, wherein the solid material is formed by molding or molding a foamed resin such as styrene foam or vinylidene foam. 4. The steel pipe sheet pile according to claim 1, wherein a plurality of metal fittings for locking the rod-shaped solid material are provided on the female joint. 5. The short rod-shaped solid material is inserted continuously or / and intermittently in the longitudinal direction of the joint. 4. A steel pipe sheet pile according to claim 1. 6. A tip is provided at a lower position on an extension of a female joint at a lower end portion of a steel pipe sheet pile, wherein the tip is provided. The steel pipe sheet pile according to claim 5.