JPH0348291B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a joint for steel sheet piles, and more particularly to a joint that can expand, contract, and bend in response to the displacement of steel sheet piles due to ground movement or the like.

[Conventional technology]

Steel sheet piles are installed into the ground by connecting the joints at both ends to form a continuous steel sheet pile wall, which prevents the destruction of earth and sand before and after the wall. It is widely used in all types of construction work such as retaining walls, bridge piers, cut-off walls, and embankments. With conventional steel sheet piles, when ground displacement due to an earthquake or loosening of the ground due to rainwater occurs, the mutual joints will sway and shear, but they will not expand, contract, or bend in the lateral direction of the connection. There was a risk that the steel sheet piles would become disengaged or the steel sheet piles would be destroyed or deformed, thereby impairing the functions of the steel sheet piles or causing damage to structures connected to the steel sheet piles.

Therefore, the present applicant first proposed the patent application no.
No. 168333 (Japanese Unexamined Patent Publication No. 60-62325), Patent Application No. 42449 (1988) (Japanese Unexamined Patent Application No. 188522), Showa
1959 Patent No. 60316 (Japanese Unexamined Patent Publication No. 1983-203732)
and Patent Application No. 60317 of 1988 (Japanese Patent Application No. 60317-
(No. 203733), we proposed a joint for steel sheet piles in which a flexible water-stopping member made of rubber, synthetic resin, etc. is straddled between a pair of plate-shaped parts that have a joining joint part with an adjacent steel sheet pile. . Since this joint has a flexible water-stopping member installed between a pair of plate-shaped parts, it can expand, contract, and flex to closely follow the displacement of the steel sheet pile due to ground movement, etc. Therefore, there is no fear that the steel sheet piles will be destroyed or damaged due to ground movement, etc., and the steel sheet piles can fully perform their functions and improve their durability.

[Problems to be solved by the invention]

However, in the steel sheet pile joint according to the above proposal, the pair of plate parts having the joining joint part with the adjacent steel sheet pile are usually manufactured by dividing a ready-made steel sheet pile, such as a U-shaped steel sheet pile, in half. However, many steel sheet piles are usually long, and it is not easy to cut them in half by a method such as fusing, and it is particularly difficult to perform this work outside a factory, such as at a construction site. Therefore, despite the simple structure of the steel sheet pile joint proposed above, there is a problem in that the processing cost is high due to the difficulty of cutting the steel sheet pile.

Therefore, the present invention was made for the purpose of solving the above-mentioned problems of a joint for steel sheet piles using a flexible water-stopping member. The present invention provides a steel sheet pile joint that can be deformed and has low processing costs, and a method for constructing the same.

[Means and actions for solving problems]

In order to achieve the above object, the steel sheet pile joint according to the invention set forth in claim 1 provides:
It is characterized by a pair of U-shaped steel sheet piles arranged face-to-face and connected by a flexible water-stopping member made of a flexible material such as rubber or synthetic resin. With this configuration, when manufacturing a joint for steel sheet piles, there is no need to divide the steel sheet piles, and ready-made U-shaped steel sheet piles can be used as they are.

Furthermore, the method for constructing a steel sheet pile joint according to the invention described in claim 2 is such that a pair of U-shaped steel sheet piles are arranged face-to-face, and the joint is made of a flexible material such as rubber or synthetic resin. A leading rigid body that guides the burying of the joint into the soil is attached to the lower end of the joint of steel sheet piles connected by a flexible water-stopping member so as to cover the bottom of the flexible water-stopping member, and a load is applied to the upper end of the joint. This feature makes it easier to push and bury the joint into the soil, and also prevents the flexible water stop member from cracking or being damaged by earth and sand when the joint is being pushed and buried. prevent.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Figures 1 to 3 show an embodiment of a joint for steel sheet piles according to the present invention, and Figure 2 is a front view thereof;
FIG. 1 is an enlarged sectional view taken along line A--A in FIG. 2, and FIG. 3 is a side view. In addition, in FIGS. 2 and 3, the joint is shown in a state immediately before push-in construction, with a lid material described later fixed to the upper end by welding or the like, and a leading rigid body described later joined to the lower end.
The joint 1 is made by aligning a pair of ready-made U-shaped steel sheet piles 2, 2' so that the joint parts 2a, 2a' at both ends of each steel sheet pile 2, 2' are in contact with or close to each other and are arranged facing each other. These pair of steel sheet piles 2,
A long plate-shaped flexible water stop member 3 bent in a serpentine cross section is arranged between the ends 3a and 3a' of the flexible water stop member 3. steel sheet pile 2,
It is fixed approximately in the center of 2' with a large number of bolts and nuts 5.

The flexible water stop member 3 is made of rubber, synthetic resin, or rubber.
Synthetic resin toppings on cloth or cloth-like materials, rubber/synthetic resin with reinforcing materials such as cloth, cloth-like materials, net-like materials embedded or attached, or flexible materials such as thin metal plates. It is made of materials.

By configuring in this way, the steel sheet piles 2,
2' forms a casing having a substantially hexagonal cross section, and the flexible water stop member 3 is housed within this casing. Therefore, unlike the steel sheet pile joints filed in the above-mentioned applications, there is no need to provide a special protective steel plate to protect the flexible water-stopping member, so the material cost is also lower compared to the joints filed in the above-mentioned applications. It's not a disadvantage.

When embedding the joint 1, a pair of steel sheet piles 2,
In order to prevent displacement between the steel sheet piles 2 and 2', which may cause breakage or damage to the flexible water stop member 3 that connects the two, and to prevent earth and sand from entering, the joints 2a and 2a of the steel sheet piles 2 and 2' are connected. 'It is desirable to spot-weld the comrades at appropriate locations.

Next, a construction method for the joint 1 of the present invention will be explained. When constructing the joint 1, the upper end of the joint 1 is applied with a load using a vibrohammer, etc., and is pushed into place. Sometimes earth and sand,
A leading rigid body 7 is attached to the lower end of the joint 1 to prevent crack damage to the flexible water stop member 3 caused by rocks or the like. As shown in FIG. 5, the leading rigid body 7 is made of a rigid case with a pointed tip, and is equipped with front and rear walls 7a, 7a that sandwich the steel sheet piles 2, 2' arranged face-to-face, and both sides 7b. , 7b are open at the top so that the joint parts 2a, 2a' of the steel sheet piles 2, 2' are exposed outside the leading rigid body 7, and the connection with the adjacent steel sheet piles is not obstructed. Further, wire fixtures 7c, 7c are fixed to the front and rear walls 7a, 7a of the leading rigid body 7. Side edges 7d, 7 of this leading rigid body 7
Place the bottoms of both sides of the steel sheet piles 2, 2' on d, and insert the lower end of the joint 1 into the leading rigid body 7 so that the backs of the steel sheet piles 2, 2 are sandwiched between the front and rear walls 7a, 7a. do. After that, connect the wires 8, 8 (Fig. 2) to the wire fittings 7c, 7c,
The upper ends of 8 are tied to the wire fittings 9, 9 above the insertion part 1a of the joint 1, and the leading rigid body 7 is firmly fixed to the joint 1 by pulling.

The upper end of the joint 1 is applied with a load using a vibratory pile driver, etc., and then pushed into the burying. However, since a large load is applied to the upper end of the joint 1, a force is generated in the direction that separates the steel sheet piles 2 and 2' from each other. As a result, the flexible water stop member 3 may be cracked or damaged. Therefore, the lid member 10 is placed over the upper end portions of the steel sheet piles 2 and 2' so as to straddle the steel sheet piles 2 and 2' from above. The lid material 10 is its horizontal plate 10
A pair of legs 1 attached to hang down from a
0b, 10b, and the distance between the inner surfaces of the foot portions 10b, 10b is slightly larger than the distance between the outer surfaces of the steel sheet piles 2, 2'. This foot part 10
The upper ends of the steel sheet piles 2 and 2' are inserted between b and 10b and fixed by welding or bolting. In addition, 1
0c is a protruding plate for holding the vibration type driving machine.

After completing the preparations for pushing and burying the joint 1 in the above manner, as shown in FIG.
A load is applied to the upper end of the joint 1 using a vibrating pile driver or the like so that the joint 1 is engaged with the joint 11, and the joint is buried up to the upper end line B (FIG. 2) of the penetration part 1a. In this example, the depth of the push-in of the joint 1 is determined by the final buried length of the joint, the predetermined pull-up length necessary to separate the joint from the leading rigid body described later, and the allowance for subsidence of the joint due to ground subsidence. It is equal to the length plus the length. After completing the push-in embedding of the joint 1, connect the joining joint part 2a of the steel sheet pile 2 to the joint 11 of the adjacent steel sheet pile No. 2.
Steel sheet pile No. 2 is driven so as to engage with the steel sheet pile No. 2, and then adjacent steel sheet piles No. 3 and No. 4 are driven one after another.

As described above, the joint 1 is firmly fixed in place with the adjacent steel sheet piles on both sides. After that, the wire 8 is cut at line B or slightly above it, and then the lower ends of the steel sheet piles 2, 2' are separated from the engagement grooves 7b, 7b of the leading rigid body 7 by a predetermined length. The joint 1 is lifted up and the joint 1 is separated from the leading rigid body 7. At that time, it is sufficient that the tip of the wire measured and cut to a predetermined length from the ground matches the mark made on the steel sheet pile 2 or 2' at the ground level, or the tip of the wire measured and cut to a predetermined length from the ground needs to match, or from the mark made on the steel sheet pile 2 or 2' to the ground. What is necessary is to measure the length up to and reach the predetermined length. Next, by removing the cover material 10 from the upper end of the steel sheet piles 2, 2', the joint 1 is released from the restraints by the leading rigid body 7 and the cover material 10, and can follow the displacement of the steel sheet piles due to ground movement etc. The flexible water stop member 3 can be freely bent and deformed.

[Example of change]

In the above embodiment, a plate-shaped flexible material bent in a meandering cross section is used as the flexible water stop member 3, but the shape of the flexible water stop member 3 is the same as that of the above embodiment. The steel sheet piles 2, 2 may be any material as long as it can follow the displacement between the cylindrical steel sheet piles having one or more hollow portions having a circular or elliptical cross section while maintaining water-stopping properties. The fixing method for ′ may be any method as long as it can maintain water stoppage.

In the above embodiment, the joint parts 2a, 2a' of the steel sheet piles 2, 2' are spot welded to prevent displacement between the steel sheet piles 2, 2' when the joint 1 is pushed in and buried. Alternatively, a locking device 12 as shown in FIG. 7 may be used. The locking tool 12 is made by bending both ends of a steel plate having approximately the same length as the joint 1 as shown in the figure to form locking portions 12a, 12a. Steel sheet piles 2,
The shape and dimensions are such that the joining joint parts 2a and 2a' of 2' fit together. When using the locking tools 12, each joining joint portion 2a, 2a' of the joint 1 is fitted into the corresponding recesses 12b, 12b of the pair of locking tools 12, 12 before the joint 1 is pushed and buried. The locking tools 12, 12 are attached to the joint 1 in this manner.
When embedding the joint 1, push the joint 1 in such a way that the joining joint part 2a' on the steel sheet pile 2' side engages with the joint 11 of the adjacent steel sheet pile No. 1 that has already been driven, and the locking tool is inserted. 12 is pushed upward by the joint 11 of steel sheet pile No. 1 and comes out. Once the fitting 1 has been pushed and embedded, pull out the locking tool 12 on the other side from above,
The next steel sheet pile No. 2 may be cast as described above.
In addition, a locking tool 1 is installed on the adjacent steel sheet pile No. 1 side before pouring.
2 may be temporarily welded to the joining joint parts 2a and 2a', and the locking tool 12 may be attached only to the joining joint part 2a2a' on the other side.

Furthermore, as a method of locking the steel sheet piles 2 and 2' together when the joint 1 is pushed in and buried, one or more plates 13 are straddled between the steel sheet piles 2 and 2', as shown in Fig. 8. It may be temporarily fixed by welding or the like. In any case, the methods of locking the steel sheet piles 2, 2' as shown in the above embodiments and modified examples are used as necessary, and in some cases these locking methods may not be used. The leading rigid body 7 and the lid material 10
It is also possible to fix the joint 1 only by

Regarding the leading rigid body 7, in the above embodiment, the steel sheet piles 2, 2' of the joint 1 are connected by the front and rear walls 7a, 7a.
The joint 1 can be reliably guided into the soil by holding the joint 1 between the legs, and after the joint 1 is pushed into the ground, the hanging wire 8 can be cut and the joint 1 can be pulled up to guide the joint 1. Since the joint 1 is completely separated from the rigid body 7, the joint 1 can be freely displaced in any direction in the event of ground movement, which is a preferable configuration. However, the structure of the leading rigid body 7 is not limited to that shown in FIG. 5; for example, instead of using the hanging wire 8, the front and rear walls of the leading rigid body 7
Steel sheet piles 2, at appropriate locations inside a and 7a.
If 2' is temporarily welded, the casting successor 1 of the joint 1 will not have to be pulled up and separated from the leading rigid body 7.
The lower end of the joint 1 that remains in the leading rigid body 7 due to the temporary welding coming off due to ground movement is the side 7 of the leading rigid body 7.
Transverse displacement is possible through b, 7b. In addition, one of the front and rear walls 7d, 7d of the leading rigid body 7 is water welded to one of the steel sheet piles 2, 2', the other is temporarily welded, and after being pushed and buried, the temporarily welded steel sheet pile is struck. Alternatively, the temporary welding may be removed.

Further, the leading rigid body 7 is not limited to the shape shown in FIG. 5, but may have a structure in which the lower end of the joint is held between V-shaped (or U-shaped) plates. Furthermore, as shown in FIG. 2') and may be left unwelded to the other steel sheet pile 2' (or 2). Alternatively, the leading rigid body 7 may be configured to be divided into two parts in the horizontal direction, and the two constituent parts may be temporarily welded during pouring, so that the temporary welding may come off during ground movement. Note that the shape of the tip of the leading rigid body is not limited to the shape shown in the above embodiment, in which the pushing effect is greater when the tip is pointed, but may have a flat surface, for example.

The cover material 10 is not limited to the one shown in FIG.
Any structure may be used as long as it prevents relative displacement between the joints and facilitates the insertion of the joint into the soil. For example, a plate body having a T-shaped cross section and provided with a chuck plate portion of a vibratory pile driver may be fixed to the top of the steel sheet piles 2, 2' by direct welding.

〔Effect of the invention〕

As described above, the joint of the present invention has a pair of U
Because the shaped steel sheet piles are arranged face-to-face and connected with flexible water-stopping members made of flexible materials such as rubber and synthetic resin, the work of cutting the steel sheet piles can be omitted.
It is extremely convenient because it is possible to significantly save the processing cost of joints, which reduces the manufacturing cost of joints, and it is also possible to easily assemble steel sheet pile joints at locations outside of factories such as construction sites. .

In addition, since the flexible water-stopping member is completely surrounded by a pair of steel sheet piles, there is no need to install another protective iron plate to protect the flexible water-stopping member, which also saves processing costs. In addition, in terms of material costs, the material costs required for protective iron plates can be saved.

Furthermore, according to the present invention, one
Since a flexible water stop member is installed between the pair of steel sheet piles,
Compared to conventionally proposed joints, a relatively large capacity flexible water stop member can be used, and therefore,
It is also possible to follow large displacements caused by large ground movements.

In addition, the construction method of the present invention is such that a leading rigid body that guides the burying of the joint into the soil is joined to the lower end of the steel sheet pile joint having the above structure so as to cover the bottom of the flexible water stop member, and the upper end of the joint is Since the joint is pushed into the soil with a load applied to it, it is easy to push the joint into the ground, and it is also possible to effectively prevent the flexible water stop member from cracking or being damaged by earth and sand when the joint is being pushed into the ground.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing an embodiment of the joint for steel sheet piles of the present invention, Fig. 2 is a partially cutaway front view of the joint of this embodiment, and Fig. 3 is a part of the joint. FIG. 4 is a perspective view showing an example of the lid material, FIG. 5 is a perspective view showing an example of the leading rigid body, and FIG. 7 and 8 are diagrams showing a modification of the method of locking the joint, and FIG. 9 is a diagram showing a modification of the leading rigid body. DESCRIPTION OF SYMBOLS 1... Joint, 2, 2'... Steel sheet pile, 3... Flexible water stop member, 7... Leading rigid body, 10... Cover material.

Claims (1)

[Claims] 1. A pair of U-shaped steel sheet piles are arranged face-to-face and rubber
A joint for steel sheet piles, characterized in that they are connected by a flexible water-stopping member made of a flexible material such as synthetic resin. 2 A pair of U-shaped steel sheet piles are placed face-to-face and rubber
At the lower end of a joint of steel sheet piles connected by a flexible water-stopping member made of a flexible material such as synthetic resin, a leading rigid body that guides the burying of the joint into the soil is attached to the bottom of the flexible water-stopping member. A construction method for steel sheet pile joints, which is characterized by joining in a covering manner, applying a load to the upper end of the joint, and pushing it into the soil.