JPH03147908A - Sheet pile wall construction in water area - Google Patents

Abstract

PURPOSE:To make it possible to utilize a bearing function economically by connecting a sheet pile wall and a front pile with a compression resisting diagonal member, and connecting the upper end of the front pile, the upper end of the sheet pile wall and the upper end of the compression resisting diagonal member with a coupling member. CONSTITUTION:A joint of a steel sheet pile 1 is interlocked with a joint of a sheet pile 1 adjacent to the steel sheet pile 1 each other, and they are driven to the underwater foundation 2 to form a sheet pile wall 3. After that, a front pile 16 with a dowel pin is driven to the underwater foundation 2 at an interval to water side from the sheet pile wall 3, and a pile inserting lower cylindrical body 6 in a compression resisting diagonal member 12 is inserted in the front pile 16 to be placed on the foundation 2. Then, a diagonal member 4 in the diagonal member 12 is placed, and a sheet pile body fitting upper cylindrical body 13 is fitted so as to enclose the upper end of a sheet pile body 5. Mortar, etc., are filled between the cylindrical body 6 and a front pile 7, and a coupling member 8 reinforcing the cylindrical body 13, the upper end of the sheet pile wall 3, the upper end of the diagonal member 4 and the upper end of the front pile 7 is executed. In addition, backfilling soil 10 and reclaiming soil 11 are filled in the rear side of the sheet pile wall 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a water body sheet pile wall structure used for seawalls, quay walls, levee-5 breakwaters, and the like.

[Conventional technology]

Conventionally, water arrow vi,! As shown in FIGS. 15 and 16, the structure is constructed by pouring a large number of steel sheet piles 1 into the underwater ground 24 in an interlocking state, and forming a sheet pile wall 3.
is constructed, and a large number of front piles 7 are placed at intervals in the longitudinal direction of the sheet pile wall at positions away from the sheet pile wall 3, and are driven into the water bottom land vi2, and are installed in a vertical plane substantially perpendicular to the sheet pile wall 3. A large number of diagonal piles 9 extending diagonally downward from the top of the sheet pile wall 3 toward the water bottom ground 2 are placed at intervals in the longitudinal direction of the sheet pile wall and are driven into the water bottom ground 2. The upper end portion and the upper end portion of the diagonal pile 9 and the upper end portion of the front pile 7 are connected via a connecting member 8 made of a concrete slab, and a backfill top 10 and reclaimed soil 11 are placed on the back side of the sheet pile wall 3. Filled structures are known.

[Problem to be solved by the invention]

In the case of the above-mentioned conventional water area sheet pile wall structure, the arrow Fi wall 3 is
In addition to bending force and -ment, an excessive pulling force acts on the diagonal pile 9, and an excessive pushing speed force is generated on the diagonal pile 9.

The pushing force generated in the inclined shaft 9 will be resisted by the axial supporting force of the ground, that is, the pile tip supporting force and the pile circumferential friction force, but since the pushing force is excessive, the pile tip supporting force In order to ensure this, it is necessary to make the driving length of the inclined shaft 9 into the hard support layer 24 considerably long.

In addition, the pulling force generated in the sheet pile wall 3 will be resisted by the axial support force (circumferential friction force) of the ground, but since the pulling force is excessive, it is necessary to ensure the circumferential friction force. In addition, it is necessary to make the driving length of the sheet pile wall 3 into the hard support layer 24 considerably long.

In this way, in the case of the conventional water body sheet pile wall structure, the inclined shaft 9
In order to support the excessive axial force generated in the sheet pile wall 3, it is necessary to drive the hard support layer 24 over a considerable length, which not only increases the material cost but also increases the construction time. There were problems such as buckling of the slanted shaft 9 and the shaft 8 made of steel.

Also, when driving the slanted pile 9, the angle of inclination of the slanted shaft 9 with respect to the vertical line (usually 10° to 20°) cannot be made too large.
It was impossible to reduce the pushing force generated in the inclined shaft 9. Furthermore, if the member length of the inclined shaft 9 becomes longer, it becomes difficult to cast diagonally and straightly, and it may bend in the middle, which not only makes it impossible to secure the specified supporting force.
There were problems such as generation of secondary stress due to bending.

In addition, the front pile 7 hardly resists the external force in the horizontal direction, but only supports the vertical downward load such as the dead weight of the upper concrete work and the overlay load. There was a problem that there was waste. Furthermore, when embanking in front of the sheet pile wall 3, an excessive bending moment is generated in the slope shaft 9 due to the weight of the embankment, so the slope shaft 9 needs to have considerable cross-sectional rigidity, which increases material and construction costs. there were.

In this way, conventional water body sheet pile wall structures have a structure that resists horizontal external forces such as soil water pressure mainly by the axial supporting force of the slope shaft 9 and the sheet pile wall 3, and the supporting capacity function of the ground is used. The middle and lateral support forces were not fully utilized.

An object of the present invention is to provide a water body sheet pile wall structure that can utilize the supporting force function of the ground, that is, the axial supporting force and the lateral supporting force, without waste.

[Means for Solving the Problems] In order to achieve the above object, in the water area sheet pile wall structure of the present invention, a large number of steel sheet piles 1 are driven into the underwater bed ground 2 in a state where they are interlocked with each other. , a sheet pile wall 3 is constructed, and a large number of compression-resistant diagonal members 4 extending diagonally downward from the upper part of the sheet pile wall 3 toward the water bottom ground 2 are arranged at intervals in the longitudinal direction of the sheet pile wall, and the compression-resistant diagonal members 4 are arranged at intervals in the longitudinal direction of the sheet pile wall. The front pile 7 inserted into the lower cylinder 6 for pile insertion connected to the lower end of the pile 4 is driven into the underwater ground 2, and the lower cylinder 6 is connected to the middle part of the front pile 7 to complete the connection. The upper end of the front pile 7, the upper end of the sheet pile wall 3, and the upper end of the compression-resistant diagonal member 4 are connected by a connecting member 8.

[For production]

The compressive force that acts on the compression-resistant diagonal members 4 due to the lateral external force caused by the soil IO, etc. that acts on the sheet pile wall 3 is not directly transmitted to the hard support layer, as in the conventional water body sheet pile wall structure described above. , at the joint, the pushing force 1 on the front pile 7 is converted into a bending moment and a shear force. At this time, the pushing force generated on the front pile 7 is considerably smaller than the pushing force generated on the conventional inclined shaft 9. In addition, bending moments and shear forces will be resisted by the lateral supporting force of the ground.

As the pushing force generated on the front pile 7 becomes smaller, the pulling force generated on the sheet pile wall 3 also becomes considerably smaller.

Furthermore, since the angle of inclination of the compression-resistant diagonal member 4 with respect to the vertical line can be set large, the axial force generated in the front pile 7 and the sheet pile wall 3 can be further reduced.

〔Example〕 Next, the present invention will be explained in detail using illustrated examples.

4 to 7 show a compression-resistant diagonal member 12 with a cylindrical body used in an embodiment of the present invention. A lower cylindrical body 6 for pile insertion is fixed by welding, and the lower cylindrical body 6 is provided with an opening that communicates the inside with the compression-resistant diagonal member 4, and furthermore, the upper end portion of the compression-resistant diagonal member 4 is The upper cylinder body 13 for inserting into the sheet pile body is made of a steel cylinder perpendicular to
is fixed by welding, and the upper cylinder body 1 for fitting into the sheet pile body
A large number of slits 14 are provided at intervals around the upper part of 3. Rubber seal rings 15 are fixed to the upper and lower ends of the lower cylindrical body 6, and reinforcing bars or the like are fixed to the lower cylindrical body 6 by welding to form dowels 23 with protrusions. An injection hole 21 is provided on the upper surface of the upper end side of the compression-resistant diagonal member 4 .

FIG. 8 shows a front pile 16 with a dowel used in an embodiment of the present invention, in which a plurality of front piles 7 made of steel pipes are provided on the outer periphery of the portion to be inserted into the lower cylindrical body 6 for pile insertion. A dowel reinforcing bar 17 is fixed by welding.

Next, a construction example of a water area sheet pile wall structure according to an embodiment of the present invention using the compression-resistant diagonal member 12 with a cylinder and the front pile 16 with a dowel will be described.

First, as shown in FIG. 9 and FIG. It is used as a sheet pile 1, and a sheet pile wall 3 is constructed by interlocking a large number of steel sheet piles 1 and driving them into the underwater ground 2.

Next, as shown in FIGS. 11 and 12, a large number of front piles 16 with dovetails are arranged at intervals in the longitudinal direction of the sheet pile wall at a position away from the sheet pile wall 3 toward the water side, and are placed in the water bottom ground 2. The lower cylindrical body 6 for pile insertion in the compression-resistant diagonal member 12 with a cylindrical body is inserted into the vertical shaft 16 with a dowel and placed on the water bottom ground 2, or placed near the water bottom ground surface, Furthermore, the compression-resistant diagonal member 4 in the compression-resistant diagonal member 12 with a cylindrical body
is placed on a vertical plane perpendicular to the sheet pile wall 3,
The upper cylinder body 13 for fitting into the sheet pile body of the compression-resistant diagonal member 12 with a cylinder body is fitted so as to surround the upper end portion of the sheet pile body 5.

Next, as shown in FIGS. 13 and 14, a steel connecting plate 20 was fitted into each slit around the upper cylinder 13, and the connecting plate 20 was brought into contact with the outer surface of the sheet pile body 5. In this state, the connecting plate 20 is fixed to the upper cylinder body 13 and the sheet pile body 5 by welding.

Next, as shown in FIGS. 1 to 3, a time-hardening filler material 22 such as concrete or mortar is injected through the injection hole 21 provided at the upper end of the compression-resistant diagonal member 4, and The space between the cylinder body 6 and the front pile 7 is filled with the time-hardening filling material 22, and then the sheet pile main body fitting cylinder 13 and the upper end of the sheet pile wall 3.

A connecting member 8 made of reinforced concrete that connects the upper end of the compression-resistant diagonal member 4 and the upper end of the front pile 7 is constructed, and backfilling lO and reclaimed soil 11 are installed on the back side of the sheet pile wall 3.
Fill it.

In the embodiment described above, after driving the front pile 7, the lower cylinder 6 of the compression-resistant diagonal member 12 with a cylinder body is inserted into the front pile 7; The lower cylindrical body 6 of the material I2 is placed on the underwater ground 2 by appropriate means, and
The upper cylindrical body 13 of the fluid I plow compression-resistant diagonal member 12 is attached to the sheet pile body 5
After fitting into the upper end of the bottom 11, the front stake 7 is inserted into the lower cylinder 6 and the bottom 11! ! You can type it on board 2.

When carrying out this invention, a grout injection pipe that opens into the lower cylinder 6 is inserted in advance into the compression-resistant diagonal member 4 made of a steel pipe, and concrete or the like is inserted between the grout injection pipe and the compression-resistant diagonal member 4. It may be filled with a time-hardening filler, and may be made of a steel pipe with a pressure resistance of 1? A dowel such as a protrusion for transmitting shear force may be provided on the inner surface of the diagonal member 4.

The cross-sectional shape of the joint in m-made arrows may be any cross-sectional shape other than that shown in the drawings, and in w4-made arrows, groove-shaped, Z-shaped or H-shaped steel sheet piles, or other types of steel sheet piles can be used instead of steel pipe sheet piles. Steel sheet piles with arbitrary cross sections may be used.Furthermore, the upper cylinder 1 for fitting into the sheet pile main body is attached to the upper end of the compression-resistant diagonal member 4.
3 is not fixed, but the upper end of the compression-resistant diagonal member 4 is connected to the upper end of the arrow 1 anti-body 5 or the upper end of the sheet pile wall by direct welding, etc., or by other means such as via a steel plate or shape m, etc. They may be combined by any suitable means.

The lower end of the compression-resistant diagonal member 4 and the lower cylindrical body 6 may be connected by a pin extending laterally.

〔Effect of the invention〕

Since the present invention is configured as described above, it produces the effects described below.

(1) The compressive force acting on the compression-resistant diagonal member 4 is converted into a pushing force 9 bending moment and shear force with respect to the front F'iC1 at the joint between the compression-resistant diagonal member 4 and the forward value 7, so the forward Since the pushing force generated on the pile can be considerably reduced, the loss on the hard support layer 24 is small, improving construction efficiency, and the forward value 7.
The problem of local buckling can also be solved.

(2) As the pushing force generated at the front value 7 becomes smaller, the pulling force generated on the sheet pile wall 3 also becomes considerably smaller, so the depth of penetration into the hard support layer 24 is reduced, improving construction efficiency. At the same time, the problem of local buckling of the steel sheet pile 1 can also be solved.

(3) Since the angle of inclination of the compression-resistant diagonal member 4 with respect to the vertical line can be set large, the forward value 7 and the axial force generated in the sheet pile wall 3 can be further reduced.

(4) External forces such as soil water pressure will ultimately be resisted by the front value 7 in the seabed ground and the sheet pile wall 3, but in this case, both the axial bearing capacity and lateral bearing capacity of the ground 6 (The inclination angle of the compression diagonal member 4 with respect to the vertical line can be set arbitrarily, so the axial force can be adjusted according to ground conditions, external force conditions, etc., and the degree of freedom in design is greatly increased.) Improve L-wise.

These factors enable rational design according to ground conditions, external force conditions, etc., reduce the amount of materials used, and improve construction efficiency, making it possible to significantly reduce construction costs.

(5) On the front side of the sheet pile wall, the front wall and compression-resistant diagonal members are densely arranged, so it can also have a trapping effect that attracts fish.

[Brief explanation of the drawing]

Figures 1 to 3 show a water body sheet pile wall structure according to an embodiment of the present invention, in which Figure 1 is a vertical side view showing the whole structure, and Figure 2 is a front view value and resistance value in Figure 1. A partially longitudinal side view showing an enlarged view of the joint with the compressed diagonal member, Figure 3 is the same as Figure 1.
It is a partially vertical side view which expands and shows the joint part of the upper part of the sheet pile wall, the upper part of the compression-resistant diagonal material, and a connection member in a figure. FIG. 4 is a side view of a pressure-resistant IF diagonal member with a cylinder used in an embodiment of the present invention, and FIG. 5 is a partially vertical side view showing an enlarged lower part of the compression-resistant diagonal member with a cylinder; Fig. 6 is an enlarged side view of the upper part of the compression-resistant diagonal member with a cylindrical body, Fig. 7 is a plan view thereof, and Fig. 8 is a partial cutaway of the front value with diagonal support used in the embodiment of the present invention. FIG. Figure 9 is a plan view of the sheet pile wall, Figure 1O is its enlarged plan view,
Fig. 11 is a plan view showing the state in which compression-resistant diagonal members with cylinders are installed between the sheet pile main body and the front end of the sheet pile wall, Fig. 12 is a partially vertical side view thereof, and Fig. 13 is the arrow 1 of the sheet pile wall. A plan view showing a state in which the opposite main body and the upper cylinder body for inserting into the sheet pile main body are connected, the first
Figure 4 is a partially longitudinal side view. FIG. 15 is a vertical side view showing a conventional water body sheet pile wall structure, and FIG. 16 is a cross-sectional plan view thereof. In the figure, l is a steel sheet pile, 2 is a submerged ground, 3 is a sheet pile wall, 4 is a compression-resistant diagonal member, 5 is a sheet pile body, 6 is a lower cylinder for pile insertion, 8 is a connecting member, and lO is a backfill top , 12 is a compression-resistant diagonal member with a cylindrical body, 13 is an upper cylinder for inserting into the sheet pile body, 14 is a slit, 15 is a rubber seal ring, 16 is a front value with a diagonal, 17 is a dowel reinforcing bar, and 20 is a steel connection. The plate, 22, is a time-curable filler material. Certain 14 figures

Claims (1)

[Claims] A large number of steel sheet piles 1 are interlocked with each other and are driven into the water bottom ground 2 to form a sheet pile wall 3, and a large number of steel sheet piles 1 extend diagonally downward from the top of the sheet pile wall 3 toward the water bottom ground 2. Compression diagonal members 4 are arranged at intervals in the longitudinal direction of the sheet pile wall, and the front pile 7 inserted into the lower cylinder for pile insertion 6 connected to the lower end of the compression diagonal member 4 is inserted into the underwater ground 2. The lower cylindrical body 6 is connected to the middle part of the front pile 7 to form a joint, and the upper end of the front pile 7, the upper end of the sheet pile wall 3, and the upper end of the compression-resistant diagonal member 4 are connected to each other. and the connecting member 8
A water body sheet pile wall structure connected by.