JPH0370049B2 - - Google Patents

Description

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

Prior art 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, including sea walls, 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.
With No. 168333, we proposed a joint for steel sheet piles in which a flexible water-stopping member made of rubber, synthetic resin, etc. is straddled between the plate-like parts that have joints that connect to adjacent steel sheet piles. Since this joint has a flexible water-stopping member installed between the steel sheet piles, it is possible to expand, contract, and bend the steel sheet piles by closely following the displacement of the steel sheet piles due to ground movement, etc. There is no risk of destruction or damage due to ground movement, etc., and the steel sheet piles can fully perform their functions and improve their durability.

However, since the steel sheet pile joint proposed above uses a flexible water-stopping member made of rubber or synthetic resin, the flexible water-stopping member is likely to suffer damage such as cracks when the joint is installed. In addition to construction problems, for example, if the above joint is used when a steel sheet pile wall is used as a quay, there is a problem that the flexible water stop member is easily damaged by contact with a ship. In order for such a joint to fully demonstrate its excellent performance, it is essential to first solve this problem.

Purpose of the Invention The present invention has been made with the aim of solving the above-mentioned problems of a joint for steel sheet piles using a flexible water-stopping member. To provide a joint for steel sheet piles and a method for constructing the same, in which there is no risk of damage to a flexible water stop member during and after the construction of the steel sheet pile.

Structure of the Invention In order to achieve the above-mentioned object, the steel sheet pile joint according to the present invention has a pair of plate-shaped portions having joint portions with adjacent steel sheet piles on both sides, and is made of a flexible material such as rubber or synthetic resin. A protective plate holding member is provided on at least one side of the flexible water-stopping member and includes a flange portion projecting toward the inside of the joint and a web portion rising from above the plate-shaped portion. A protective plate that covers the flexible water-stopping member is loosely fitted between the plate holding member and the plate-shaped portion, and the width of the protective plate is adjusted by a predetermined length in the width direction from the side edge of the flange portion. The protective plate is covered by the flexible waterproof member and is spaced apart from the web portion of the protective plate holding member to allow contraction of the flexible water stop member. While protecting the flexible water stop member and maintaining protection of the flexible water stop member after installation, the joint extends to a predetermined length at which the protection plate is covered by the flange portion of the protection plate holding member. In addition, the joint is allowed to contract by the length by which the side edge of the protection plate is separated from the web portion of the protection plate holding member.

Furthermore, the method for constructing a steel sheet pile joint according to the invention described in claim 2 is such that a leading rigid body that guides the embedding of the joint into the soil is attached to the lower end of the steel sheet pile joint having the above-mentioned structure to provide a flexible watertight structure. The members are joined together so as to cover the bottom of the member, and a load is applied to the upper end of the joint, and the joint is driven into the soil to protect not only the sides but also the bottom of the flexible water-stopping member when the joint is installed. This is what I did.

Furthermore, the method for constructing a joint for steel sheet piles according to the present invention as set forth in claim 3 is such that the plate-shaped portion of the joint for steel sheet piles having the above-mentioned structure is placed on both sides of a leading rigid body having a casing for accommodating the lower end of the joint. The leading rigid body is joined to the lower end of the joint so as to engage with the kerf formed in the joint,
After applying a load to the upper end of the joint and driving it into the soil, the joint is pulled up a predetermined length and separated from the leading rigid body. The joint is safely and reliably guided into the soil while protecting the joint, and after installation, the joint functions fully.

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

FIG. 1 is a partially cutaway view showing one side of an embodiment of a joint for steel sheet piles according to the present invention, FIG. 2 is a partially cutaway view showing the other side of this embodiment, and FIG. 3 is a partially cutaway view showing the other side of this embodiment. 1st
Figure 4 is a perspective view showing a surface shown in Figure 2 with a portion of the surface excluding the top and bottom ends cut away; The figure shown in FIG. 5 is an enlarged sectional view taken along the line DD in FIG. 2. In addition, in Figures 1 and 2,
The joint is shown in a state immediately before being implanted, with a stop member described below welded and fixed to the upper end and a leading rigid body described later joined to the lower end. In Figs. 1 to 5, a joint A is a long flexible water stop member 1 made of rubber, synthetic resin, etc. and having two cylindrical parts 1a in the center.
and a pair of long plate-like parts 2, 2 each having a shape obtained by halving a U-shaped steel sheet pile arranged on both sides thereof. The plate-shaped parts 2, 2 each have a joining joint part 2a with an adjacent steel sheet pile and a water stop member fixing part 2b for fixing the flexible water stop member 1. The flexible water stop member 1 has attachment portions 1b on both sides of a cylindrical portion 1a. This mounting part 1
The pair of plate-like parts 2, 2 are connected by the flexible water stop member 1 by overlapping the fixing part 2b of the plate-like part 2 and fastening it with bolts and nuts 4 through the mounting plate 3. .

Each of the plate-like parts 2, 2 on one side A-1 (Figs. 1 and 3) of the joint A is provided with a protection made of a long steel material with an L-shaped cross section over the entire length of the joint A, excluding the upper end. A plate holding member 5 is provided. Protective plate holding member 5
This includes a flange portion 5a extending parallel to the flexible water stop member 1 toward the inside of the joint, and a web portion 5b welded to rise from the plate-shaped portion 2, and the protective plate holding member 5 and the plate-shaped A protective plate 6 that covers the flexible water stop member 1 is fitted between the flexible water stop member 1 and the flexible water stop member 1 . The width of this protection plate 6 is as follows when the flexible water stop member 1 is not expanded or contracted.
The protection plate 6 is covered by the flange portion 5a of the protection plate holding member 5 by a predetermined length from the side edge 6a in the width direction, and is only a length that allows the flexible water stopper member 1 to contract to a desired length. The side edge 6a of the protection plate is set so as to be spaced apart from the web portion 5b of the protection plate pressing member 5.
Note that 7 is a protective plate support material that is welded to the plate-shaped parts 2, 2. At both ends of the protection plate 6, protrusions 6b are formed at a predetermined distance from the flange 5a side of the protection plate holding member 5. Protrusions 5c are formed on the plate 6 side at predetermined intervals.

The embedded parts 8 (embedded parts,
Although the drawing shows the middle part of the flexible water-stopping member, the protection plate holding member 9 for pouring is fixed to the middle part of the flexible water-stopping member by welding or other suitable method. has been done. In this example,
The pouring protection plate pressing member 9 is composed of an outer pressing member 9a made of a plurality of angle irons and a corresponding inner pressing member 9b in the shape of a round bar. The end of the web portion 9a-1 of the outer pressing member 9a is welded to the outside of the water stop member fixing portion 2b of the plate-like portion 2, and the flange portion 9a-
2 is a flexible water stop member 1 toward the inside of the joint.
It is installed so that it extends parallel to the The inner pressing member 9b is welded to a position corresponding to the outer pressing member 9a on the plate-shaped portion 2 outside the water-stopping member fixing portion 2b and inside the outer pressing member 9a. Note that the position of the inner pressing member 9b is the same as that of the outer pressing member 9a.
Although it is preferable to arrange the outer presser member 9a and the inner presser member 9b in a staggered manner, the position is not limited thereto.

A protective plate 10 made of steel or the like and having a U-shaped cross section is fitted in the space between the outer pressing member 9a and the inner pressing member 9b on both sides of the plate-shaped portion thus formed. The protection plate 10 is prevented from detaching outward in the direction perpendicular to the surface of the flexible water stopper member 1 by the outer pressing member 9a, but is allowed to slide in the axial direction of the joint. The inner pressing member 9b has the function of preventing the protection plate 10 from moving in the left-right direction in the figure and firmly holding the protection plate 10 in a predetermined position. The flexible water stop member 1 extends in order to receive the force of opening in the direction of separation,
It has the function of preventing the burial position from becoming inaccurate as a result of the entire joint being displaced to the side opposite to the side where it engages with the joining joint of adjacent steel sheet piles.

Next, the construction method of the joint of the present invention will be explained with reference to FIGS. 1 to 8.

In the construction of joint A, the upper end of joint A is pressed and buried using a vibrating hammer, etc., but at this time, cracks and damage to the flexible water-stopping member 1 are prevented, and the soil of joint A is A leading rigid body 11 is joined to the lower end of the joint A in order to safely guide the insertion into the interior. As shown in FIG. 6a, the leading rigid body 11 is made of a steel case with a pointed tip, and has vertical grooves 11a, 11a formed on both sides. Further, wire fixtures 11b are fixed to both sides of the leading rigid body 11 (one on the front side of the kerf 11a and one on the rear side of the kerf 11a). As shown in FIG. 6b, after fitting the protective plates 6, 10 and the protective plate pressing member 5 into the leading rigid body 11 and inserting the leading rigid body mounting portion 2c of the plate-like portion 2 of the joint A into the cut groove 11a. Wires 12, 12 to wire fittings 11b, 11b
(Figs. 1 and 2) and connect the upper end of the wire to the wire fitting 13 above the insertion part 8 of the plate-like part 2,
13 to firmly fix the tension leading rigid body 11 to the joint A.

FIG. 7 shows the state in which the upper end of the joint A is fixed before being cast. As mentioned above, the joint A is buried by applying a load to the upper end using a vibrating hammer or the like, but since a large load is applied to the upper end of the joint A, the plate parts 2 and 2 are separated from each other. As a result, the flexible water stop member 1 may be cracked or damaged. Therefore, the fixed part 2 of the plate-shaped parts 2, 2
A stop member 14 made of an iron plate is straddled over the upper ends of b and 2b and fixed by welding. Further, the stopper member 14 may or may not be fixed by welding, and the lid member 15 may be placed between the fixing portions 2b, 2b of the plate-like portions 2, 2 from above, as required. The lid member 15 has a pair of legs 15a that are attached to hang down from the lower surface of the lid member 15.
15a, and long grooves 15b, 15b are formed in the foot portions 15a, 15a. The fixing parts 2b, 2 of the plate-shaped parts 2, 2 are attached to these long grooves 15b, 15b.
Insert the upper end of b and fix by welding. In addition, 15c
is a protruding plate for holding a vibratory driving machine. In order to prevent the protection plate 6 from slipping up during driving, the upper end portion of the protection plate 6 is welded to the upper surface of the stopper member 14 or to the fixing portions 2b, 2b of the plate-like portions 2, 2. Alternatively, it is preferable to fix with bolts or the like. In addition, in order to prevent the protective plate 6 from slipping down when the joint is separated from the leading rigid body 11 after casting and the upper end of the joint is fused as described later, the flange portion 5a of the protective plate holding member 5 and the plate-shaped portion 2 are It is preferable to support the protection plate 6 by bridging the space between each bottom surface with an appropriate steel material.

Prior to casting the joint A, the protective plate temporary fixing plate 1 is fixed to the upper end of the protective plate 10 to the plate-shaped parts 2, 2.
6 and 16 (FIG. 2) are preferably temporarily fixed by bolting (or welding, etc.). This is because when the joint A is driven and buried, the protection plate 10 does not go into the ground due to the frictional resistance of the earth and sand, and only the other part of the joint A is driven into the ground, so that the protection plate 10 does not penetrate into the ground. 8 and as a result, the flexible water stop member 1
This is to prevent the material from being exposed to earth and sand. In addition, in order to prevent the joint parts above the penetration part 8 on the A-2 side from moving in the direction of mutual opening during pouring, the plate-like parts 2, 2 above the penetration part 2 are placed in one or several places with a steel plate (Fig. (not shown) is preferably temporarily fixed by welding or the like.

After completing the preparations for pouring joint A in the above manner, the connecting joint part 2a on one side of joint A is engaged with the joint of the adjacent steel sheet pile that has already been cast, and the seismic resistor is attached to the upper end of joint A. Apply a load with a hammer or the like and bury the joint up to the upper line B of the embedded part 8. At this time, the driving depth of joint A is determined based on the final buried length of the joint, the predetermined pull-up length required to separate the joint from the leading rigid body described below, and the allowable length of joint subsidence due to ground subsidence. equal to the length added.

The method for driving joint A varies depending on soil quality, driving depth, N value (standard penetration test value), and other various conditions, but when driving the joint of the above example, method 8
As shown in the figure, there is a strong tendency to move from the grid line S to the P side in the direction of the arrow X due to its structure.
Therefore, in order to prevent or correct such displacement from the grid line, for example, in the case of a sand layer, steel sheet piles
After pouring No. 1, while driving joint A with a vibrohammer, insert the pipe of the jet cutter into point J and/or point J' to soften the ground and prevent the joint from moving in the X direction. After completing the installation of joint A, the adjacent steel sheet pile No. 2 (Fig. 8)
and No. 3 one after another. In the case of a silt-containing sand layer, the joint A is built in the position shown by the dotted line, which is open by a predetermined amount on the Q side in Fig. 8. Next, it is driven in with a vibrohammer, and when the joint A moves in the X' direction and reaches the grid line S, the driving is stopped. After completing the installation of joint A, adjacent steel sheet piles No. 2 and No. 3 will be installed one after another. If joint A reaches the grid line but does not reach the planned driving depth, drive adjacent steel sheet piles No. 2 and No. 3, and firmly fix joint A with the adjacent steel sheet piles on both sides. After that, go back to driving joint A again and drive joint A to the planned driving depth. If the remaining joint A during the driving of steel sheet piles No. 2 and No. 3 interferes with the driving of steel sheet piles No. 2 and No. 3, .3 Fitting A
Pouring can be done in the following order. Also, before erecting the joint A, the Q side is cut in by a predetermined width more than the P side with a jet cutter, and the joint A is then erected and cast in the same manner as above. Alternatively, instead of cutting in with a jet cutter, the H steel may be driven into the soil several times to a predetermined depth while injecting water to soften the ground. In the case of clay-mixed sand layers, the auger digging method is advantageous.

In the manner described above, both sides of the joint A are firmly fixed in place with the adjacent steel sheet piles. After that, if a steel plate (not shown) for preventing warping is provided above the embedded part 8, this is also fused.

Next, the space between the protection plate 10, the plate-shaped parts 2, 2, and the flexible water stop member 1 is filled with sand. Since the ground near the surface is relatively soft, a protective plate 10 is used to fill the sand.
If you try to do this after pulling out the protective plate 10, the soft earth and sand near the ground surface will invade the top of the buried joint part and block the sand filling path to the buried joint part. must be done.

Next, the wire is cut at the B line or slightly above it, and the leading rigid body attachment part 2 of the plate-like parts 2, 2 is cut.
The joint A is separated from the leading rigid body 11 by lifting the joint A by a predetermined length sufficient for the joints c and 2c to be separated from the kerfs 11a and 11a of the leading rigid body 11. 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 plate-like part 2 at the ground level, or the length from the mark made on the plate-like part 2 to the ground. It is sufficient if this length reaches a predetermined length by measuring.

Next, after removing the temporary fixing plate 16 of the protective plate 16 by removing the bolt (or cutting the weld), the temporary fixing of the protective plate 10 is removed, and then the wire fixture 1 fixed to the protective plate 10 is removed.
7 (FIG. 2) by lifting the protection plate 10 with a wire (not shown) attached to the outer holding member 9 of the joint A.
Protective plate 10 from the space between a and inner pressing member 9b
Pull out and remove. Further, the upper end portions of the plate portions 2, 2 fixed by the stopper member 14 and the protection plate 6 are fused and cut along the dashed line CC in FIG. 7 after the joint A is driven.
Thus, the joint A connects the leading rigid body 11 and the protective plate 10.
It becomes a state of being released from the restraints of.

If ground movement occurs after fitting A is installed,
The joint A follows the displacement of the steel sheet pile, and when the joint is not expanded or contracted, the protection plate 6 is attached to the flange portion 5 of the protection plate holding member 5.
The side edge 6a of the protection plate 6 can be extended in the width direction up to a predetermined length covered by
It can be shrunk in the width direction by the length spaced apart from b. Furthermore, when the flexible water stop member 1 is extended due to the displacement of the steel sheet pile, the protrusion 6b of the protection plate and the protrusion 5c of the flange portion engage with each other, so that the protection plate 6
This can prevent the protective plate 6 and the flange portion 5a from coming off and creating a gap between the protective plate 6 and the flange portion 5a. However, when a force is applied to the joint that causes the flexible water stop member 1 to extend beyond the limit where the projections 6b, 6b on both ends of the protection plate engage with the projections 5c, 5c on the corresponding flange portion, the joint It is preferable to determine the strength of the protrusions 6b, 5c so that the protrusions 6b, 5c break without breaking the joint between the joint 2a and the adjacent steel sheet pile. Further, the protrusion 6b of the protection plate 6 and the flange portion 5a, and the protrusion 5c of the flange portion 5a and the protection plate 6
Since the protective plate 6 is loosely fitted with a predetermined interval between the protective plate 6 and 6 supports the protrusion 6 using the support member 7 on the opposite side as a fulcrum.
The flexible water-stopping member 1 can be bent by rotating within the range until b comes into contact with the inner wall of the flange portion 5a, so that the joint portion 2a will not break or the joint will become uncoupled. It can be prevented.

Modification Example In the above embodiment, a protective plate holding member 5 and a protective plate 6 are provided only on the A-1 side of the joint A, and a protective plate holding member 5 and a protective plate 6 are provided on the A-2 side to protect the flexible water stop member 1 only during pouring. Although the protective plate 10 is provided and is configured to be pulled out after pouring, a protective plate holding member 5 and a protective plate 6 may be provided on both sides A-1 and A-2, respectively, if necessary. It's okay. In this case, in order to prevent the plate-shaped parts 2 and 2 from separating from each other, appropriate measures should be taken, such as welding anti-flaring plates to the upper part of the penetration part 8 of the joint A and appropriate locations of the penetration part 8 prior to pouring. It is advisable to take measures.

The shapes of the protection plate 6 and the protection plate pressing member 5 are not limited to those of the above embodiments, and various modifications are possible. For example, the dimensions of the protective plate and flange, the fitting A
The protrusion 6b of the protection plate 6 and the protrusion 5c of the flange portion may be omitted depending on the place of use, purpose of use, etc.

The shape of the flexible water-stopping member is not limited to that of the above embodiments, and may be a flat plate, a corrugated sheet, or a plate-like body having a plurality of hollow parts, etc., while maintaining water-stopping properties and following displacement between steel sheet piles. Any material may be used as long as it is water-resistant, and the method of fixing it to the plate-like portions 2, 2 may be any method as long as water can be maintained.

It should be noted that the protection plate 10 does not necessarily need to cover the entire length of the embedded part of the flexible water stop member 1;
The protective plate 10 may not be provided in the portion where the leading rigid body 11 is inserted. The position at which the protective plate 10 is temporarily fixed to the plate-shaped parts 2, 2 is at the upper end of the protective plate 10 in the example shown in FIG. In the case where the temporary fixing position is not limited to the upper end of the protection plate 10, the point is to place the temporary fixation on the joint so that the temporary fixation can be easily removed at the stage of pulling out the protection plate 10 after casting the joint A. It is sufficient to temporarily secure it at any position above the buried part.

Regarding the leading rigid body 11, the leading rigid body 11 shown in FIG.
Since the leading rigid body 11 is joined to the joint A by inserting the leading rigid body 11 into the grooves 11a and 11a, both sides of the leading rigid body 11 have extremely strong strength.
This is a particularly preferred configuration in that the joint A can be safely and reliably guided into the soil when the joint A is cast. However, the configuration of the leading rigid body 11 is not limited to that shown in FIG. 6. For example, as shown in FIG.
The protective plates 10 of the three corner parts 11 of the leading rigid body 11
c, the lower end of the joint A remaining in the leading rigid body can be held by simply pulling out the protection plate 10 without having to pull up the entire joint casting successor A to separate it from the leading rigid body 11. can expand and contract laterally through the kerf 11'a. Of course, when using the leading rigid body with the configuration shown in Figure 6, the pouring follower hand must be pulled up a predetermined length to separate from the leading rigid body. Even if the leading rigid body embedded therein is tilted due to ground displacement or the like, it is advantageous in that it can expand, contract, and bend without being affected by it. Note that in this specification, the term "enclosure" is not limited to a box-shaped one as shown in FIG. 6 or FIG. )
This also includes a structure in which the lower end of the joint is held between two plates. In addition, as the leading rigid body 11,
As shown in FIG. 11, the members 5, 5 are arranged so that the bottom surfaces of the protective plate pressing members 5, 5 and the outer pressing members 9a, 9a are flush with the bottom surfaces of the plate-shaped parts 2, 2, The top surface of the plate-shaped leading rigid body 11 is welded to the respective bottom surfaces of one set of holding members, for example, the set 5 and 9 on the left side in the drawing, and the plate-like part 2 on the left side (the other set 5 and 9 on the upper side in the drawing). If the plate-like part 2 (right side) is not welded, the successor hand after pulling out the protective plate 10 can expand and contract. 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 15 in FIG. 7 is not limited to the one shown, and protects or maintains the upper end of the joint A so that the upper end of the joint A is not deformed, damaged, broken, etc. when the joint A is cast. Any method is acceptable as long as it is possible, and fixing to joint A is not limited to welding, but bolting,
Other fixing means can be used, such as repatting. In addition, an example was shown in which the upper end of the pouring successor A of the joint A is cut, but in this case, the upper end of the joint A is opened,
This is just one means of making it possible to displace following the displacement of the ground, and the cover member 15 and protection plate 6 may be fixed to the upper end of the joint A by an easy-to-remove method such as bolting without using the stopper member 14. In this case, there is no need to cut the upper end of pouring successor A. Further, a pair of appropriately shaped stoppers is fixed to the fixing parts 2b, 2b of the plate-like parts 2, 2, and the lid 15 is fixed so that the foot parts 15a, 15a of the lid 15 are locked on the outside of these stoppers. If arranged, the plate-like parts 2, 2 can be fixed to each other without using the stopper member 14 and without welding or bolting the lid member 15 to the plate-like parts 2, 2.

Although the above embodiments and modified examples are for cases in which the joint according to the present invention is used as a joint for U-shaped steel sheet piles, the present invention is not limited to joints for U-shaped steel sheet piles, and can be applied to straight type, Z-type It can also be applied as a joint for other types of steel sheet piles, such as steel sheet piles and steel pipe sheet piles.
Therefore, when the present invention is applied to joints for steel sheet piles of types other than U-shaped, the shape of the plate portion 2 is not limited to the U-shaped steel sheet pile cut in half as in each of the above embodiments; Various modifications are possible depending on the type of sheet pile.

Effects of the Invention As described above, the joint of the present invention connects a pair of plate-like parts having joint parts with adjacent steel sheet piles with a flexible water-stopping member made of rubber, synthetic resin, etc. A protective plate holding member having a flange portion projecting toward the inside of the joint and a web portion rising from the plate-like portion is provided on the flexible water-stopping member, and a protective plate holding member is provided between the protective plate holding member and the plate-like portion. A protective plate that covers the flexible water-stopping member is fitted loosely into the flange portion, and the width of the protective plate is set so that the width of the protective plate extends from the side edge of the protective plate to the flange portion by a predetermined length in the width direction when the flexible water-stopping member is not expanded or contracted. The side edges of the protection plate are set apart from the web portion of the protection plate holding member in order to allow the flexible water-stopping member to shrink. It is possible to protect the flexible water-stopping member and maintain the protection of the flexible water-stopping member after installation, and the joint is extended by the length that the side edge of the protection plate is separated from the web part of the protection plate holding member. Can be contracted. In addition, due to the structure in which the protection plate is loosely fitted between the protection plate holding member and the plate-shaped portion, when a load is applied in a direction perpendicular to the width of the joint, the protection plate rotates within a predetermined range, Since the flexible water stop member can be bent, it is possible to prevent the joining joint from breaking or coming apart.
Furthermore, due to the loose fitting structure of such a protection plate, even if the thickness of the protection plate is considerably increased, the joint can be bent within a certain range without the risk of destruction or separation of the joint joint, making it suitable for use on quay walls. This is particularly effective when a large impact force is applied to the protection plate, such as in a ship collision.

In addition, the construction method of the present invention involves joining a leading rigid body to the lower end of the steel sheet pile joint with the above structure so as to cover the bottom of the flexible water stop member, applying a load to the upper end of the joint, and driving it into the soil. As a result, not only the sides but also the bottom of the flexible water-stopping member can be protected during pouring, the flexible water-stopping member will not be damaged, and the leading rigid body will lead the push-in embedding of the joint. Therefore, it can be easily pushed and buried.

[Brief explanation of drawings]

Fig. 1 is a partially cut-away view of one side of an embodiment of the steel sheet pile joint of the present invention, Fig. 2 is a partially cut-away view of the other side of this embodiment, and Fig. 3 is a partially cut-away view of the other side of this embodiment. A perspective view showing a part of the surface shown in Figure 1, excluding the upper and lower ends, partially cut away, and Figure 4 showing a part of the surface shown in Figure 2, excluding the upper and lower ends, partially cut away. 5 is an enlarged sectional view taken along the line DD in FIG. 2, and FIG. 6 is a perspective view showing a state in which the leading rigid body is joined to the joint of the present invention.
FIG. 7 is a perspective view showing the fixed state of the upper end of the joint of the present invention before it is pushed in, FIG. 8 is a diagram schematically showing the method of driving the joint, and FIGS. 9, 10, and 11. FIG. 3 is a perspective view showing an example of a modification of the leading rigid body. A...Joint, 1...Flexible water stop member, 2...Plate-shaped part, 2a...Joint joint part, 5...Protection plate holding member, 5a...Flange part, 5b...Web part, 6
...Protection plate, 7...Leading rigid body.

Claims (1)

[Scope of Claims] 1. A pair of plate-like parts having joints with adjacent steel sheet piles are connected by a flexible water-stopping member made of rubber, synthetic resin, etc., and at least one side of the flexible water-stopping member A protective plate holding member having a flange portion projecting toward the inside of the joint and a web portion rising from above the plate-like portion is provided, and the flexible stopper is provided between the protective plate holding member and the plate-like portion. A protective plate that covers the water member is loosely fitted, and the width of the protective plate is set by the flange portion by a predetermined length in the width direction from the side edge of the protective plate when the flexible water stop member is not expanded or contracted. 1. A joint for steel sheet piles, characterized in that the side edge of the protection plate is spaced apart from the web portion of the protection plate holding member in order to allow contraction of the flexible water stop member. 2. Connect a pair of plate-shaped parts having joints to adjacent steel sheet piles with a flexible water-stopping member made of rubber, synthetic resin, etc., and attach a wall on at least one side of the flexible water-stopping member toward the inside of the joint. A protective plate holding member having a flange portion that overhangs and a web portion rising from the plate-like portion is provided, and a protection plate that covers the flexible water-stopping member is provided between the protective plate holding member and the plate-like portion. is loosely fitted, and the width of the protective plate is set such that when the flexible water-stopping member is not expanded or contracted, the protective plate is covered by the flange portion by a predetermined length in the width direction from the side edge thereof, and The joint is buried in the soil at the lower end of the joint of the steel sheet pile, which is set so that the side edge of the protection plate is separated from the web part of the protection plate holding member in order to allow contraction of the flexible water stop member. A method for constructing a joint for steel sheet piles, characterized in that a leading rigid body that guides 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 driven and buried in the soil. 3 Connect a pair of plate-shaped parts having joints to adjacent steel sheet piles with a flexible water-stopping member made of rubber, synthetic resin, etc., and attach a wall on at least one side of the flexible water-stopping member toward the inside of the joint. A protective plate holding member having a flange portion that overhangs and a web portion rising from the plate-like portion is provided, and a protection plate that covers the flexible water-stopping member is provided between the protective plate holding member and the plate-like portion. is loosely fitted, and the width of the protective plate is set such that when the flexible water-stopping member is not expanded or contracted, the protective plate is covered by the flange portion by a predetermined length in the width direction from the side edge thereof, and The lower end of the joint is accommodated in the plate-like part of the steel sheet pile joint, which is set so that the side edge of the protective plate is spaced apart from the web part of the protective plate holding member in order to allow contraction of the flexible water-stopping member. After joining the leading rigid body to the lower end of the joint so that it engages with the grooves formed on both sides of the leading rigid body having a casing, and applying a load to the upper end of the joint, the joint is driven into the soil and buried. A method of constructing a joint for steel sheet piles, characterized in that the joint is pulled up a predetermined length and separated from the leading rigid body.