JPH0348290B2 - - 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 collapse of earth and sand in front and behind it. 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 joints will slide and shear, but they will not expand, contract, or flex 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. 60-6325), Patent Application No. 42449 (1988) (Japanese Unexamined Patent Application No. 188522), Showa
1959 Patent Application No. 60316 (Japanese Unexamined Patent Publication No. 1983-203732)
and Patent No. 60317 of 1982
(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-like parts that have joints that connect to adjacent steel sheet piles. . Since this joint has a flexible water-stopping member installed between a pair of plate-like parts, it is possible to 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 back to back 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 back to back and a flexible joint made of a flexible material such as rubber or synthetic resin is used. A leading rigid body that guides the burying of the joint into the soil is joined to the lower end of the joint of steel sheet piles connected by a water-stop member so as to cover the bottom of the flexible water-stop member, and a load is applied to the upper end of the joint. In addition, it is characterized by being driven and buried in the soil,
This makes it easier to push in the joint, and prevents the flexible water stop member from being cracked or damaged by earth and sand when the joint is pushed in and buried.

〔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 being implanted, with a cover 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 consists of a pair of ready-made U-shaped steel sheet piles 2 and 2' arranged back to back with an interval between them, and a long piece of steel sheet pile 2 and 2' that is bent to have a U-shaped cross section. A plate-shaped flexible water stop member 3 is arranged, and each end portion 3a, 3a' of this flexible water stop member 3 is attached to the steel sheet piles 2, 2' via a mounting plate 4 with a large number of bolts and nuts 5. It is fixed in place.

The flexible water stop member 3 is made of rubber, synthetic resin, or rubber.
Fabric-like material topped with synthetic resin, rubber, etc.
Synthetic resin with reinforcing material embedded or attached,
Alternatively, it is made of a flexible material such as a thin metal plate.

A pair of plate-shaped stoppers 6, 6' are steel sheet piles 2,
One stopper 6 is provided at one end of the back of the steel sheet pile 2, and the other stopper 6' is provided at one end of the back of the steel sheet pile 2. They are welded to one end of the back of each member 2' at positions facing each other with the flexible water stop member 3 in between. With this configuration, the steel sheet piles 2, 2' and the stoppers 6, 6' form a box with a rectangular cross section, and the flexible water stop member 3 is housed in this box. . 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.

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 pressed and buried by applying a load with a vibro hammer or the like. A leading rigid body 7 is attached to the lower end of the joint 1 in order to prevent cracking and damage to the flexible water stop member 3 due to earth, sand, rocks, etc. when the joint 1 is pushed and buried. As shown in FIG. 5, the leading rigid body 7 is made of a steel case with a pointed tip, and two vertical steel sheet pile engagement grooves 7b and 7b' are formed in both side walls 7a and 7a, respectively. . Also, on both side walls 7a, 7a of the leading rigid body 7, wire fittings 7c,
7c is fixed. The lower ends of the steel sheet piles 2, 2' of the joint 1 engage with the steel sheet pile engagement grooves 7b, 7b' of the leading rigid body 7, and the stoppers 6, 6' engage with the steel sheet piles 7b, 7b' on both side walls 7a, 7b'.
The lower end of the joint 1 is inserted into the leading rigid body 7 so as to be accommodated inside the guide member 7a. After that, the wires 8, 8 (Fig. 2) are tied to the wire fittings 7c, 7c, and the upper ends of the wires 8, 8 are tied to the wire fittings 9, 9 above the embedded part 1a of the joint 1, and the leading rigid body is pulled. Firmly fix 7 to joint 1.

The joint 1 is buried by applying a load to the upper end using a vibrating mining machine or the like, but 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 at the upper end of the steel sheet piles 2, 2' so as to be visible 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 vibratory 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 vibratory drilling machine or the like, and the joint is buried up to the upper end line B (FIG. 2) of the embedding portion 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. equals length plus length.
After completing the pushing and embedding of the joint 1, the steel sheet pile No. 2 is driven so that the joining joint part 2a' of the steel sheet pile 2' is engaged with the joint 11 of the adjacent steel sheet pile No. 2, and then the adjacent steel sheet pile No. 2 is driven. Pour sheet piles No. 3 and No. 4 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 a position 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 by the amount of the joint 1 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' at the ground level, or the length from the mark made on the steel sheet pile 2' to the ground. It is sufficient if this length reaches a predetermined length by measuring. 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 curved to have a U-shaped cross section is used as the flexible water stop member 3, but the shape of the flexible water stop member 3 is that of the above embodiment. The steel sheet piles 2, 2' may be used as long as they can follow the displacement of the steel sheet piles while maintaining water-stopping properties, such as corrugated sheets or cylindrical bodies having one or more hollow parts. Any fixing method may be used as long as it can maintain water stoppage.

In the above embodiment, each stopper 6, 6'
is fixed to one end of the back of the steel sheet piles 2, 2' by welding, but it may also be fixed by bolting.
Further, in the above embodiment, the stoppers 6, 6'
Although a length reaching near the upper end of the steel sheet piles 2, 2' is used, it may be provided only at a position slightly above and below the penetration part 1a of the joint 1. Further, instead of using long plates as in the above embodiment, the stoppers 6, 6' are provided with a plurality of short plates 6A spaced apart from each other by a distance of 12, as shown in the partial side view of FIG. Good too.

Instead of burying the stoppers 6, 6' fixed to the steel sheet piles 2, 2' as in the above embodiment,
As shown in FIG. 8, a pair of locking members 13, 13, 13' are provided at opposing positions in the longitudinal direction of the steel sheet piles 2, 2'.
13' are fixed by welding, and these locking members 1
Stoppers 6, 6' made of elongated plates may be fitted between 3, 13 and 13', 13'. In this way, materials can be saved by removing the stoppers 6, 6' after the joint has been driven and embedded.

Regarding the leading rigid body, the one shown in FIG. 5 has two upward steel sheet pile engagement grooves 7b, 7b' formed in both side walls 7a, 7a of the enclosure, respectively. Since the lower ends of the steel sheet piles 2 and 2' are configured to engage with the steel sheet piles 7b', both sides of the leading rigid body 7 are extremely strong, and can be safely and reliably inserted into the soil when the joint 1 is driven. This is preferable in that it can provide guidance. However, the structure of the leading rigid body 7 is not limited to that shown in FIG. 5. For example, as shown in FIG. If the joint 1 is clamped and temporarily welded, the joint 1 will not have to be pulled up and separated from the leading rigid body 7 in its entirety, but the joint 1 will remain in the leading rigid body 7 when the temporary welding comes off due to ground movement. The lower end of 1 is on the sides 7e, 7e of the leading rigid body 7.
Lateral telescopic displacement is possible through. However, in this case, the lateral displacement of the joint is limited by the bends on both sides of the steel sheet piles 2, 2'. In the example shown in FIG. 9, one of the front and rear walls 7d, 7d of the leading rigid body 7 is permanently welded to one of the steel sheet piles 2, 2', and the other is temporarily welded, and then temporarily welded after pouring. The temporary welding may be removed by tapping the steel sheet pile on the side.

Furthermore, the leading rigid body 7 is not limited to a box-shaped one as shown in FIG. 5 or FIG. 9, but may have a structure in which the lower end of the joint is held between a box-shaped framework or a V-shaped (or U-shaped) plate. It may be. Further, as shown in FIG. 10, the top surface 7f of the plate-shaped leading rigid body 7
Welded to the bottom of one steel sheet pile 2 (or 2') and/or stopper 6 (or 6') and not to the other steel sheet pile 2' (or 2) and/or stopper 6' (or 6). If you leave it,
The pouring successor can be expanded and contracted. Also, the leading rigid body 7
When pouring, the structure is divided into two horizontally.
The two components may be tack welded so that the tack weld can be dislodged in the event of ground movement. Note that when using the leading rigid body 7 shown in FIGS. 9 and 10, the hanging wire 8 is not necessary. Note that although the tip of the leading rigid body has a sharp tip as in each of the above examples, the pushing effect is greater, but the tip is not limited to this, and may have a flat surface, for example.

The cover material 10 is not limited to the one shown in FIG. 4, but may be used to prevent relative displacement between the steel sheet piles 2 and 2' when the joint 1 is cast, and to facilitate the insertion of the joint into the soil. Any configuration may be used. For example, a steel sheet pile 2,
It may also be fixed by direct welding to the top of 2'.

〔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 placed back to back 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 and the processing cost of the joint can be significantly reduced. This is extremely advantageous because it is possible to save money and reduce the manufacturing cost of the joint, and it is also possible to easily assemble the steel sheet pile joint at a location outside a factory such as a construction site.

Further, since the joint of the present invention has a relatively small driving cross section, it has the advantage that it is easy to drive and can be easily pushed and buried even in places where the driving width is limited.

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. FIGS. 7 and 8 show examples of changes to the stopper, and FIGS. 9 and 10 show examples of changes to the leading rigid body. DESCRIPTION OF SYMBOLS 1... Joint, 2, 2'... Steel sheet pile, 3... Flexible water stop member, 6, 6'... Stopper, 7... Leading rigid body, 10... Cover material.

Claims (1)

[Claims] 1. A joint for steel sheet piles, characterized in that a pair of U-shaped steel sheet piles are arranged back to back and connected by a flexible water-stopping member made of a flexible material such as rubber or synthetic resin. . 2 A pair of U-shaped steel sheet piles are placed back to back and connected by a flexible water-stopping member made of flexible material such as rubber or synthetic resin.The joint is buried in the ground at the lower end of the joint of the steel sheet pile. A construction method for a steel sheet pile joint, characterized in that a leading rigid body that leads the flexible water stop member is joined so as to cover the bottom of the flexible water stop member, and a load is applied to the upper end of the joint and the joint is pushed into the soil and buried.