JP5192339B2 - Steel sheet pile, steel sheet pile impermeable wall, and steel sheet pile placing method - Google Patents

Description

The present invention relates to a steel sheet pile having a joint portion that can be connected to a joint portion of another steel sheet pile.
The present invention also relates to a steel sheet pile impermeable wall constructed by using a plurality of steel sheet piles having joint portions that can be connected to joint portions of other steel sheet piles.
Furthermore, the present invention relates to a steel sheet pile placing method used when placing a steel sheet pile having a joint portion connectable with a joint portion of another steel sheet pile on the ground.

  The steel sheet pile can form a highly durable wall body by fitting the joint portions provided on both ends in the width direction to the joint portions of other steel sheet piles and connecting to the other steel sheet piles. . When such a wall made of a plurality of steel sheet piles is used as a water-impervious wall that prevents the diffusion of contaminated water or the like, an extremely high water-stopping property is required for the water-impervious wall. As a steel sheet pile which can exhibit such a high water stop, what is described in patent document 1 is known, for example.

  The steel sheet pile described in Patent Document 1 is formed at an elongated plate-shaped web portion, a flange portion provided on one end side and the other end side along the width direction of the web portion, and a distal end portion of the flange portion. And a pocket groove formed on the inner surface side of the joint portion. When constructing a water-impervious wall using this steel sheet pile, for example, after inserting a rod-like waterproof rubber having water expandability into each pocket groove of a plurality of steel sheet piles constituting the impermeable wall, respectively. A plurality of steel sheet piles are sequentially placed in the ground. At this time, the steel sheet pile (following steel sheet pile) joint is fitted into the joint of another steel sheet pile (preceding steel sheet pile) already placed in the ground, and the subsequent steel sheet pile is placed in the ground. Then, the subsequent steel sheet pile is connected to the preceding steel sheet pile. In the water shielding wall constructed in this way, the water stop rubber of each steel sheet pile absorbs the moisture in the ground and expands, so that the gap between the joint portions is closed by the expanded water stop rubber. Water-proofing between parts is ensured.

In the steel sheet pile described in Patent Literature 1, the cross section of the joint portion is formed in a hook shape, both ends (upper end and lower end) along the longitudinal direction of the joint portion are respectively open ends, and the joint portion An elongated slit-shaped opening is formed on the toe side along the longitudinal direction (placement direction) of the steel sheet pile.
By the way, in the steel sheet pile as described in Patent Document 1, when it is driven into the ground, the ground components such as stones and earth and sand constituting the ground through the opening on the toe side of the joint portion are inside the joint portion. May invade. When the ground structure is infiltrated inside the joint part of the steel sheet pile and the subsequent steel sheet pile is driven into the ground, the water stop inserted into the pocket groove of the joint part due to friction with the infiltrated ground structure There is a risk of damage such as breakage or chipping in the rubber. Thereby, the reliability of the water stop between the joint parts by a water stop rubber falls.

  Patent Document 2 discloses a steel sheet pile capable of solving the above-described problems. In the steel sheet pile described in Patent Document 2, an angle-shaped or semi-circular metal wing piece so as to surround the joint portion, and a gap (slit portion) formed between the joint portion and the wing piece. And an elastic body that closes the slit portion and allows the subsequent steel sheet pile to be inserted into the slit portion.

Here, a pocket portion which is a space penetrating in the placement direction is formed inside the wing piece, and the lower end (opening end) of the pocket portion is closed by welding a metal lid to the lower end portion of the wing piece. Has been. Thus, when the steel sheet pile is driven into the ground, the ground structure is prevented from entering the pocket portion and the joint portion by the blade piece and the elastic body.
JP 2003-160929 A JP 2003-138557 A

  However, in the steel sheet pile described in Patent Document 2, since the cross-sectional area of the pocket portion formed inside the blade piece and the elastic body is large, the resistance to the steel sheet pile is very high when the steel sheet pile is driven into the ground. Expected to grow. In addition, after the steel sheet pile has been placed on the ground, the pocket portion is filled with a water filling filler. For this reason, it is necessary to securely connect and fix the blade piece to the steel sheet pile with sufficiently high strength so that the blade piece does not fall off from the steel sheet pile even after the completion of driving, and the blade piece is also made of elastic material such as a leaf spring. You also need to attach your body. These series of operations are very complicated, and the blade piece and elastic body are required as additional parts, which causes a significant increase in the construction cost of the wall constructed of multiple steel sheet piles. obtain.

The object of the present invention is to take into account the above facts, and when the steel sheet pile is driven into the ground, it is possible to effectively prevent the soil structure from entering the inside of the joint portion of the steel sheet pile, and the wall body. An object of the present invention is to provide a steel sheet pile and a steel sheet pile impermeable wall capable of suppressing an increase in construction cost and complication of construction work.
Furthermore, in view of the above facts, the object of the present invention is to effectively prevent the soil structure from entering the inside of the joint portion of the steel sheet pile when placing the steel sheet pile on the ground, and An object of the present invention is to provide a steel sheet pile placing method capable of suppressing increase in construction cost and complication of construction work.

A steel sheet pile according to claim 1 of the present invention includes a plate-shaped web portion, a flange portion provided at a side end portion of the web portion, and a larsen type joint portion formed at a tip portion of the flange portion. A steel sheet pile having a joint portion of another steel sheet pile fitted to the joint portion and the joint portion so as to extend in the longitudinal direction of the web portion. A water-stopping material that stops water between the steel sheet pile and the steel sheet pile so as to close the opening on the toe side of the joint part. of the steel sheet pile is Da設the ground, separated from the steel sheet pile receives a pressing force from the joint portion of the other sheet pile, or a fracture that closure member, and possess, the closing member, wherein A long and narrow metal body is formed along the longitudinal direction, and a part of the metal body is formed on the claw portion of the joint portion. Other part, characterized in that attached by welding, respectively to the distal end side of the flange portion.

In the steel sheet pile according to claim 1, when the closing member is attached to the steel sheet pile so as to close the opening on the toe side of the joint portion of the steel sheet pile, when the steel sheet pile is driven into the ground, the closing member Thus, it is possible to prevent the ground components such as stone and earth and sand from entering the inside of the joint portion through the opening on the toe side of the joint portion.
As a result, at the time of placing the steel sheet pile, it is possible to prevent the water-stopping material attached to the inside of the joint portion from being damaged due to friction with the ground structure or falling off, and at the time of placing the subsequent steel sheet pile, Friction force from the joint part of the subsequent steel sheet pile is not transmitted to the water stop material of the preceding steel sheet pile via the ground structure, and the water stop material of the preceding steel sheet pile is damaged by the friction force from the joint part of the subsequent steel sheet pile. Can also be prevented.

Further, in the steel sheet pile according to claim 1, if the subsequent steel sheet pile is driven into the ground while the joint portion of the subsequent steel sheet pile is fitted to the joint portion of the preceding steel sheet pile, the pushing from the joint portion of the subsequent steel sheet pile is performed. Since the blocking member that has received pressure is detached from the preceding steel sheet pile or breaks, the movement of the subsequent steel sheet pile in the direction of placement is not hindered by the blocking member, and the subsequent steel sheet pile is driven smoothly into the ground. Can do.
Moreover, in the steel sheet pile according to claim 1, since the closing member is only attached to the steel sheet pile as compared with the conventional steel sheet pile, the operation of attaching the closing member to the steel sheet pile is easy, and is constructed by a plurality of steel sheet piles. The increase in the cost of the wall body and the complexity of the construction work can also be suppressed.

Or steel sheet pile according to claim 2 was, in the steel sheet pile according to claim 1, wherein the upper end portion of the closing member, the joint portion of the toe side of the peeling starting portion which is bent or curved in a direction away the opening Is formed.

The steel sheet pile according to claim 1 or 2 , further comprising a pocket groove formed on an inner surface side of the joint portion so as to extend along a longitudinal direction of the web portion, and water and water in the pocket groove. It can be set as the steel sheet pile which inserted the said water stop material formed of the water expansible rubber which the volume expands by reaction.
In the steel sheet pile, since the water stop material is inserted into the pocket groove of the joint part, for example, compared with the case where the water stop material is applied to the inner surface side of the joint part or pasted, When the subsequent steel sheet pile is driven into the ground while fitting the joint part of the subsequent steel sheet pile to the joint part of the preceding steel sheet pile, the water stop material moves downward due to the frictional force from the joint part of the subsequent steel sheet pile. Or it can prevent effectively falling off from a joint part.

Furthermore, by forming the water-stopping material with water-expandable rubber that reacts with water and expands its volume, after placing the steel sheet pile on the ground, the water-stopping material inserted into the pocket groove into the ground The contained water can be absorbed and the water stop material can be expanded from the inside of the pocket groove to the outside.
As a result, when the steel sheet pile is driven into the ground, the entire water stop material is stored in the pocket groove, and it is effective that the water stop material is damaged by friction with the joint portion of the subsequent steel sheet pile. After the steel sheet pile has been placed on the ground, the water stop material can be expanded from the pocket groove to the gap between the joints, and the gap can be reliably sealed (water stop) with the water stop material.

The steel sheet pile according to claim 1 or 2 , wherein the water stop material is formed of a water-swellable water stop material whose volume expands by reacting with water, and the water stop material is applied to the joint portion. It can be.
Further, steel sheet pile impervious wall according to claim 3 has a plurality of sheet piles, a steel sheet pile impervious wall of the joint portions is constructed are connected to the adjacent steel sheet pile, the steel sheet pile Is a steel sheet pile according to claim 1 or 2 .

According to a fourth aspect of the present invention, there is provided a steel sheet pile driving method comprising: a plate-shaped web portion; a flange portion provided at a side end portion of the web portion; and a larsen type formed at a distal end portion of the flange portion. A steel sheet pile for use in a steel sheet pile having a joint portion, between the joint portion and a joint portion of another steel sheet pile fitted to the joint portion inside the joint portion. A mounting step of mounting a water stop material for water stop so as to extend in a longitudinal direction of the web portion, and a part of a closing member formed by a long and narrow metal body along the longitudinal direction of the joint portion. The claw portion is attached with another part of the closing member by welding to the front end side of the flange portion , and the closing member closes the opening on the toe side of the joint portion by the closing member, Ground on the inside of the joint through the opening on the toe side of the joint A preceding placing step for placing the preceding steel sheet pile into the ground while preventing the intrusion of the composition, and after completion of the preceding placing step, the joint portion of the subsequent steel sheet pile is fitted to the joint portion of the preceding steel sheet pile. The subsequent steel sheet pile is driven in the ground while being combined, and the closing member is gradually peeled off or broken from the preceding steel sheet pile by the joint portion of the subsequent steel sheet pile according to the movement of the subsequent steel sheet pile in the casting direction. And a placing step.

In the steel sheet pile driving method according to claim 4 , in the preceding driving step, the blocking member prevents the ground component from entering the inside of the joint portion through the opening on the toe side of the joint portion. By placing the steel sheet pile in the ground, it is possible to prevent the water stoppage material installed inside the joint from being damaged or dropped off due to friction with the ground structure when the preceding steel sheet pile is placed. At the same time, when placing the subsequent steel sheet pile, the frictional force from the joint part of the subsequent steel sheet pile is not transmitted through the ground structure, and the water stoppage material may be damaged by the frictional force from the joint part of the subsequent steel sheet pile. Can be prevented.

Further, in the steel sheet pile driving method according to claim 4 , as compared with the conventional steel sheet pile driving method, in the closing process, it is only necessary to attach the closing member to the steel sheet pile, and the ground structure to the inside of the joint portion. Can be prevented from entering, so that the mounting work is easy, and an increase in the cost of the wall constructed by a plurality of steel sheet piles can be suppressed.
Furthermore, in the steel sheet pile driving method according to claim 4 , the subsequent steel sheet pile is driven into the ground while the joint portion of the subsequent steel sheet pile is fitted to the joint portion of the preceding steel sheet pile in the subsequent driving step. And moving the trailing steel sheet pile in the casting direction by gradually peeling or breaking the blocking member from the preceding steel sheet pile by the joint portion of the trailing steel sheet pile according to the movement of the trailing steel sheet pile in the casting direction. Is not obstructed by the blocking member, the subsequent steel sheet pile can be smoothly driven into the ground.

As explained above, according to the steel sheet pile and the steel sheet pile impervious wall according to the present invention, when the steel sheet pile is driven into the ground, the ground component enters the inside of the joint portion of the steel sheet pile. It can prevent effectively, and also can suppress the increase of the construction cost of a wall body, and complication of construction work.
Furthermore, according to the steel sheet pile driving method according to the present invention, when the steel sheet pile is driven into the ground, it is possible to effectively prevent the ground component from entering the inside of the joint portion of the steel sheet pile, and the wall. Increase in body construction cost and complication of construction work can be suppressed.

Hereinafter, a steel sheet pile, a steel sheet pile impermeable wall and a steel sheet pile placing method according to embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a steel sheet pile according to an embodiment of the present invention, and FIGS. 2 and 3 show an enlarged joint portion of the steel sheet pile according to the embodiment of the present invention.
As shown in FIG. 1, the steel sheet pile 10 according to the present embodiment is formed in a plate shape elongated in one direction as a whole, and has a substantially U-shaped cross-sectional shape. The steel sheet pile 10 has a flat web portion 12 which is elongated along the longitudinal direction (arrow L direction in FIG. 1B) in the center in the width direction (arrow W direction) and has a certain width. At the same time, a flange portion 14 is formed that is bent obliquely from one end and the other end in the width direction of the web portion 12. Each of the pair of flange portions 14 is formed in a tapered shape that spreads outward along the width direction W, and has a shape that is symmetrical with respect to the center in the width direction of the web portion 12.

  As shown in the cross-sectional view of FIG. 1A, a larsen joint 16 having a substantially cross-sectional shape along the width direction W is formed at the tip of the flange portion 14. The joint portion 16 is formed with a bottom plate portion 17 that protrudes outward in the width direction W from the distal end portion of the flange portion 14, and the thickness direction (arrow) of the steel sheet pile 10 from the distal end portion of the bottom plate portion 17. A claw portion 18 that protrudes toward the web portion 12 along the (T direction) is formed. The claw part 18 inclines inward (flange part 14 side) along the width direction W, and the cross-sectional shape of the front end side is substantially wedge-shaped. A substantially planar meshing surface 20 is formed inside the claw portion 18.

  As shown in FIG. 2, a concave pocket groove 22 is formed on the inner surface of the bottom plate portion 17 in the joint portion 16 over the entire length. The pocket groove 22 has a depth direction substantially coincident with the thickness direction T, and has a cross-sectional shape that is substantially trapezoidal. Here, as shown in FIG. 2B, the pocket groove 22 has a width (opening width) WE along the width direction W on the inlet side slightly narrower than the width on the bottom surface side.

  The steel sheet pile 10 is used as a structural component of a wall body 24 such as a vertical impermeable wall as shown in FIG. The wall body 24 is constructed by driving a plurality of steel sheet piles 10 sequentially into the ground 26 and arranging these steel sheet piles 10 linearly along the width direction W. At this time, a pair of adjacent steel sheet piles 10 are driven into the ground 26 so that the joint portions 16 mesh with each other, as shown in the enlarged partial views of FIGS. 7B and 7C. And are connected to each other with sufficient strength through these joint portions 16.

The wall body 24 according to the present embodiment is used particularly for the purpose of preventing the diffusion of contaminated water flowing out from a waste final disposal site, contaminated soil, etc., and has a very high water stoppage (for example, equivalent hydraulic conductivity). Is 1 × 10 ⁻⁶ cm / s or less). For this reason, as shown in FIG. 2 (B), a waterstop rubber 28 which is a fixed seal material is fitted into the pocket groove 22 in the steel sheet pile 10. The water stop rubber 28 is formed in a round bar shape with a substantially circular cross section. As a molding material of the water-stopping rubber 28, a so-called water-expandable rubber (in a broad sense, an elastomer having water expandability) that can expand to several times its volume by causing a water absorption reaction upon contact with water. For example, natural rubber, chloroprene rubber or the like blended with a high molecular substance such as starch, cellulose, polyacrylate, or polyvinyl alcohol.

  The outer diameter of the waterproof rubber 28 is slightly larger than the opening width WE of the pocket groove 22, and the depth of the pocket groove 22 is slightly longer than the outer diameter of the waterproof rubber 28. As a result, the water-stopping rubber 28 inserted into the pocket groove 22 is in a state where a part of its outer peripheral surface is in pressure contact with the vicinity of the opening end in the pocket groove 22, and the bottom surface of the pocket groove 22 due to elastic restoring force. In addition to being biased to the side, it is difficult for the pocket groove 22 to fall off.

As shown in FIG. 2A, an adhesive is applied to form a bonding layer 32 in the vicinity of the bottom surface of the pocket groove 22 immediately before the water blocking rubber 28 is inserted. Accordingly, when the waterstop rubber 28 is inserted into the pocket groove 22, the waterstop rubber 28 is bonded and fixed to the bottom surface portion of the pocket groove 22 via the adhesive layer 32.
As shown in FIG. 3A, the steel sheet pile 10 has a circular cross section along the width direction W, and a steel closing member 34 is fixed. The blocking member 34 has a part of the outer peripheral surface abutted against the tip of the claw portion 18 and another part abutted near the tip of the flange portion 14. The parts are attached to the vicinity of the tip of the claw 18 and the flange 14 by welding. As a result, the opening 19 (see FIG. 2) on the toe side of the joint portion 16 is closed by the closing member 34. Here, the joint structure 42 of the steel sheet pile 10 according to the present embodiment is configured by the joint portion 16, the water blocking rubber 28 fitted in the pocket groove 22, and the closing member 34 attached to the joint portion 16. The diameter D of the closing member 34 is about 1 to 2 times the opening width WH of the opening 19 (see FIG. 2B).

As shown in FIG. 4, the closing member 34 is formed in a round bar shape having substantially the same length as the joint portion 16 along the longitudinal direction L, and a part on the upper end side of the slit-shaped opening 19 is excluded. Most of them are blocked. Further, the welded portion 44 between the closing member 34, the claw portion 18 and the flange portion 14 is formed discontinuously at a predetermined pitch (for example, 1 m pitch) along the longitudinal direction.
The closing member 34 is placed while fitting the joint portion of the subsequent steel sheet pile to the joint portion of the preceding steel sheet pile without detaching or breaking when the preceding steel sheet pile to which the closing member 34 is attached is placed. In doing so, it is attached to the claw part 18 and the flange part 14 by welding with such a joining strength that it receives or depresses from the preceding steel sheet pile under the pressing force of the subsequent steel sheet pile. For example, spot welding or arc welding with a length of several centimeters may be performed discontinuously at a pitch of about 1 m along the longitudinal direction L.

As shown in FIG. 4, a separation starting point portion 40 that is bent or curved in a direction away from the opening 19 of the joint portion 16 is formed at the upper end portion of the closing member 34. The peeling starting point portion 40 is inclined toward the web portion 12 with respect to the longitudinal direction or is gently curved. Thereby, the upper end part facing the peeling start part 40 in the opening 19 is in an open state.
Regarding the intermediate steel sheet pile 10 excluding the first and last ones at the time of placing, it is desirable to attach the closing member 34 only to one side of the joint portions 16 on both sides.

Next, a method for constructing the wall body 24 with the steel sheet pile 10 configured as described above will be described.
When constructing the wall body 24, the mounting process of the waterproof rubber 28 on the steel sheet pile 10 and the closing process of closing the opening 19 of the joint portion 16 by the closing member 34 are sequentially performed.
In the mounting process, as shown in FIG. 2 (A), an adhesive is applied near the bottom surface of the pocket groove 22 in the steel sheet pile 10 to form the adhesive layer 32, and then as shown in FIG. 2 (B). The waterstop rubber 28 is inserted into the pocket groove 22. At this time, for example, by continuously pressing the water stop rubber 28 from one end to the other end by a roll jig (not shown) provided with a circular roller, the water stop rubber 28 is removed from the one end. It gradually press-fits into the pocket groove 22 toward the other end side, and finally the waterproof rubber 28 is inserted into the pocket groove 22 over the entire length. The water stop rubber 28 inserted into the pocket groove 22 is pressed against the bottom surface portion and both side surface portions of the pocket groove 22. Thereby, the water stop rubber 28 is bonded to the bottom surface portion of the pocket groove 22 by the adhesive layer 32.

  In the closing step performed after the completion of the mounting step, the closing member 34 on which the peeling start point 40 is formed in advance is placed between the claw portion 18 and the flange portion 14, and the opening 19 is closed by the closing member 34. In this state, the closing member 34 is welded to the claw portion 18 and the flange portion 14, and the welding portion 44 is formed at a predetermined pitch along the longitudinal direction between the closing member 34 and the claw portion 18 and the flange portion 14 by a welding material. Form.

The mounting step and the closing step as described above are preferably performed immediately before placing the steel sheet pile 10 on the ground 26. This is to reliably prevent the water-stopping rubber 28 from expanding before being placed due to rain, moisture or the like.
As shown in FIG. 7, when placing the steel sheet pile 10 on the ground 26, the upper end portion of the steel sheet pile 10 is held by the vibrator hammer 58 suspended from the crane 56 of the crawler crane 54, and the steel hammer pile 58 is used. While vibrating the sheet pile 10 in the vertical direction, the vibrator 56 is lowered together with the steel sheet pile 10 at a predetermined driving speed by the crane 56. Accordingly, the steel sheet pile 10 is driven into the ground 26 at a predetermined driving speed by the weight of the steel sheet pile 10 and the impact force of vibration.

At this time, as shown in FIG. 5, the subsequent steel sheet pile 10F is driven into the ground 26 while the other joint portion 16 is fitted to one joint portion 16 of the preceding steel sheet pile 10P. Go. Thereby, the succeeding steel sheet pile 10F is connected to the preceding steel sheet pile 10P via each joint part 16, and the wall body 24 is extended in the width direction W by the succeeding steel sheet pile 10F.
Further, immediately after the joint portion 16 of the subsequent steel sheet pile 10F is fitted to the joint portion 16 of the preceding steel sheet pile 10P, the vicinity of the distal end of the joint portion 16 of the subsequent steel sheet pile 10F comes into contact with the separation starting point portion 40 of the closing member 34. In this state, when the vibratory hammer 58 and the subsequent steel sheet pile 10F are lowered in the placing direction, the own weight and vibration impact are transmitted from the joint portion 16 of the subsequent steel sheet pile 10F to the separation starting point portion 40. As a result, immediately after the trailing steel sheet pile 10F is lowered, the own weight and impact force of the succeeding steel sheet pile 10F are transmitted to the one or more welded portions 44 on the upper end side via the separation starting point portion 40. As a result, one or more welded portions 44 on the upper end side are destroyed. When the welded portion 44 on the upper end side is destroyed in this way and the subsequent steel sheet pile 10F is further lowered, the one or more welded portions 44 positioned below the destroyed welded portion 44 also have their own weight and impact force. These welds 44 are also sequentially destroyed.

  As a result, the closing member 34 gradually peels from the upper end side to the lower end side from the claw part 18 and the flange part 14 of the preceding steel sheet pile 10P as the subsequent steel sheet pile 10F moves in the driving direction. For this reason, since a big resistance is not made to act on the subsequent steel sheet pile 10F in which the closing member 34 descends, the subsequent steel sheet pile 10F is smoothly fitted with the joint portion 16 fitted to the joint portion 16 of the preceding steel sheet pile 10P. It can be driven into the ground 26. At this time, the closing member 34 is not attached to the joint portion 16 of the succeeding steel sheet pile 10F on the side that is fitted to the joint portion 16 of the preceding steel sheet pile 10P. In the subsequent steel sheet pile 10F, a closing member 34 is attached to the joint portion 16 on the other end side.

Thus, in this embodiment, when the placement of the succeeding steel sheet pile 10F is completed, the closing member 34 is peeled off from the preceding steel sheet pile 10P and separated, so that the separated closing member 34 can be recovered, By this recovery, it can be easily grasped that the closing member 34 is completely detached from the opening 19 on the toe side of the joint portion of the preceding steel sheet pile 10P.
In this embodiment, an elongated steel round bar is used as the closing member 34. However, as shown in FIG. 3B, a thin metal plate elongated in the longitudinal direction L (for example, a thickness of about 2 to 10 mm). May be used as the closing member 36. Similarly to the closing member 34, the closing member 36 is also attached to the distal end portion of the claw portion 18 and the distal end side of the flange portion 14 by welding. In this case, the joint structure 42 includes the joint portion 16, the water blocking rubber 28 fitted in the pocket groove 22, the claw portion 18, and the closing member 36 attached to the joint portion 16.

  However, it is not necessary to form the peeling starting point portion 40 at the upper end portion of the closing member 36. That is, since the closing member 36 is formed of a thin metal plate that can be easily sheared, the closing member 36 is moved from the upper end side to the lower end by the joint portion 16 of the preceding steel sheet pile 10P as the succeeding steel sheet pile 10F moves in the placing direction. Since it can be gradually sheared (broken) toward the side (or the welded portion 44 can be broken and broken), the subsequent steel sheet pile 10F can be smoothly driven into the ground 26 without being obstructed by the closing member 36. it can. As a welding method, spot welding can be used in addition to arc welding depending on the thickness of the closing member 36 and the like.

  In addition, the closing member is made of metal such as aluminum, copper, steel, and stainless steel, and the cross-section along the width direction W of the closing member is formed in a wedge shape or a taper shape. ) May be inserted into the opening 19 and pressed to fix the closing member to the opening 19 and close the opening 19. In this case, according to the movement of the succeeding steel sheet pile 10F in the placing direction, the joint member 16 of the succeeding steel sheet pile 10F gradually drops the closing member from the opening 19 from the upper end side toward the lower end side. It becomes possible to drive the sheet pile 10F into the ground 26 smoothly.

When the steel sheet pile 10 is driven into the ground 26, the water stop rubber 28 inserted into the pocket groove 22 gradually absorbs moisture contained in the ground 26, as shown in FIG. 6 (B). Swell from inside the pocket groove 22. As a result, the gap between the joint portions 16 fitted to each other can be reliably sealed (water-stopped) by the expanded water-stopping rubber 28.
As the water stop material to be loaded in the pocket groove 22, in addition to the fixed water stop rubber 28, a water-expandable amorphous seal material is applied or injected into the pocket groove 22, and this is used as the water stop material. It is also good.

Next, the effect | action of the joint structure 42 of the steel sheet pile 10 which concerns on this embodiment, and the placement method of the steel sheet pile 10 is demonstrated.
In the joint structure 42 of the steel sheet pile 10 according to the present embodiment, the closing members 34 and 36 are attached to the steel sheet pile 10 so as to close the opening 19 of the joint portion 16 of the steel sheet pile 10, whereby the steel sheet pile 10 is grounded 26. When driving in, ground members such as stones and earth and sand can be prevented from entering the joint portion 16 through the opening 19 by the closing members 34 and 36.

  As a result, at the time of placing the steel sheet pile 10, it is possible to prevent the water stop rubber 28 mounted on the inner side of the joint portion 16 from being damaged or dropped due to friction with the ground structure, etc. At the time of placing, the frictional force from the joint part 16 of the subsequent steel sheet pile 10F is not transmitted to the water stop rubber 28 of the preceding steel sheet pile 10P via the ground structure, and the frictional force from the joint part 16 of the subsequent steel sheet pile 10F It is possible to prevent the water stop rubber 28 of the preceding steel sheet pile 10P from being damaged or dropped out.

  Moreover, in the joint structure 42, if the subsequent steel sheet pile 10F is driven into the ground 26 while the joint part 16 of the subsequent steel sheet pile 10F is fitted to the joint part 16 of the preceding steel sheet pile 10P, the joint part of the subsequent steel sheet pile 10F is obtained. Since the closing members 34 and 36 that have received the pressing force from 16 are separated from the preceding steel sheet pile 10P or broken, the movement of the subsequent steel sheet pile 10F in the direction of placing is not hindered by the closing members 34 and 36, The subsequent steel sheet pile 10F can be driven into the ground 26 smoothly.

  Further, in the joint structure 42, the closing members 34 and 36 are preceded by welding or the like, compared with a conventional steel sheet pile joint structure provided with a blade piece, an elastic body, or the like that prevents intrusion of ground components into the seal portion. Since it only attaches to the steel sheet pile 10P, the operation | work which attaches the obstruction | occlusion members 34 and 36 to the steel sheet pile 10 is also easy, and also the cost increase of the wall body 24 constructed | assembled with the several steel sheet pile 10 and the complication of construction work are each respectively. Can be suppressed.

  Moreover, in the joint structure 42, since the water stop rubber 28 is inserted and inserted in the pocket groove 22 of the joint part 16, for example, when a water stop material is applied to the inner surface side of the joint part or pasted. In comparison, when the succeeding steel sheet pile 10F is driven into the ground 26 while fitting the joint portion 16 of the succeeding steel sheet pile 10F to the joint portion 16 of the preceding steel sheet pile 10P, It is possible to effectively prevent the water-stopping rubber 28 from moving downward or dropping off from the joint portion 16 due to frictional force.

Further, in the joint structure 42, the water-stopping rubber 28 is formed of a water-expandable rubber that reacts with water and expands in volume, so that the steel sheet pile 10 is placed in the ground 26 and then inserted into the pocket groove 22. The water contained in the ground 26 can be absorbed by the water stop rubber, and the water stop rubber 28 can be expanded from the inside of the pocket groove 22 to the outside.
As a result, when the steel sheet pile 10 is driven into the ground 26, the entire water stop rubber 28 is stored in the pocket groove 22, and the water stop rubber 28 frictions with the joint portion 16 of the subsequent steel sheet pile 10F, etc. After the steel sheet pile 10 is driven on the ground 26, the water stop rubber 28 is expanded from the pocket groove 22 to the gap between the joint portions 16, and the gap is stopped. The rubber 28 can surely seal (stop water).

  The steel sheet pile 10 according to the present embodiment has a pair of tapered flange portions 14 and has a so-called U-shaped cross section. The joint of the steel sheet pile 10 according to the present embodiment, even if the distal end side is bent outward in the width direction and a joint portion is formed at the distal end portion of the flange portion, and the cross-sectional shape is a so-called hat shape. The structure 42 and the placement method can be applied.

  Further, in the present embodiment, the pocket groove 22 is formed in the joint portion 16 of the steel sheet pile 10 extending in the longitudinal direction, and the case where the water stop rubber 28 is inserted into the pocket groove 22 has been described. As shown, even when a water-absorbing swellable waterproofing material 60 is applied to the inner surface side of the joint part 16 in the steel sheet pile 10 as a water-swellable waterproofing material 60, the opening of the joint part 16 by the closing members 34 and 36 is shown. If 19 is closed, when the steel sheet pile 10 is driven into the ground, it is possible to effectively prevent the ground constituent from entering the inside of the joint portion 16 of the steel sheet pile 10.

Next, an example of an experimental result of placing the steel sheet pile 10 according to the embodiment of the present invention on the ground 26 will be described as an example.
As the steel sheet pile 10, an effective width WR = 600 mm, an effective height HR = 210 mm (see FIG. 1A), and a length of 16.5 m were used.
As the waterstop rubber 28, one having a diameter = 12 mm, a tensile strength = 2.94 MPa or more, an elongation at break = 500% or more, a hardness = A34 ± 10, and a volume change rate = 175 ± 75% was used.

As an adhesive for adhering the waterstop rubber 28 to the bottom surface of the pocket groove 22, a synthetic rubber is used as a main component and toluene and n-hexane are used as main solvents, and this is uniformly applied to the bottom surface of the pocket groove 22 with a brush. Was applied to a thickness of
In this example, a steel round bar having a diameter of 13 mm and a length of 16.5 m was used as the closing member 34. The closing member 34 was welded to the claw portion 18 and the flange portion 14 in a dot shape at a pitch of 1 m along the longitudinal direction, and the opening 19 was closed by the closing member 34. Further, a separation starting point portion 40 was formed at the upper end portion of the closing member 34.

  In this example, each steel sheet pile 10 was driven into the ground 26 using a vibro hammer. In the embodiment, four steel sheet piles 10 are respectively driven into the ground 26, and after the wall body 24 (fitting part of the joint part 16: three places, the total number of water-stopping rubbers 28: four pieces) is constructed, The steel sheet pile 10 was pulled out of the ground 26 and visually inspected for the presence or absence of damage to the water stop rubber 28. As a result, the water stop rubber 28 was not observed to be damaged or broken.

It is sectional drawing and the perspective view along the width direction which show the structure of the steel sheet pile which concerns on embodiment of this invention. It is sectional drawing along the width direction which shows the structure of the steel sheet pile shown by FIG. 1, and the water stop rubber with which this steel sheet pile is mounted | worn. It is sectional drawing along the width direction which shows the structure of the steel sheet pile shown by FIG. 1, and the joint structure applied to this steel sheet pile. It is a perspective view which shows the structure of the steel sheet pile and closure member which concerns on embodiment of this invention. It is sectional drawing and the perspective view which followed the width direction which shows the state which the pair of steel sheet pile concerning embodiment of this invention fitted mutually. It is sectional drawing along the width direction which shows the joint part and water-stopping rubber which mutually fitted in a pair of steel sheet pile concerning embodiment of this invention. It is a schematic diagram which shows the wall constructed | assembled with the steel sheet pile which concerns on embodiment of this invention, and the construction method of this wall. It is sectional drawing which shows the joint part of the steel sheet pile at the time of using a water absorption swelling water stop material as a water stop material which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Steel sheet pile 10F Subsequent steel sheet pile 10P Prior steel sheet pile 12 Web part 14 Flange part 16 Joint part 17 Bottom plate part 18 Claw part 19 Opening 20 Engagement surface 22 Pocket groove 24 Wall body 26 Ground 28 Water stop rubber 32 Adhesive layers 34, 36 Blocking Member 40 Separation start point 42 Joint structure 44 Welded part 54 Crawler crane 56 Crane 58 Vibro hammer 60 Water-absorbing and swelling water-stopping material

Claims (4)

A steel sheet pile having a plate-shaped web part, a flange part provided at a side end part of the web part, and a Larzen type joint part formed at a tip part of the flange part,
The water stop which is attached inside the joint part so as to extend in the longitudinal direction of the web part, and stops water between the joint part and the joint part of another steel sheet pile fitted to the joint part. Material,
It is attached to the steel sheet pile so as to close the opening on the toe side of the joint part, and while the joint part of another steel sheet pile is fitted to the joint part, the other steel sheet pile is driven into the ground, A closing member that receives a pressing force from a joint portion of another steel sheet pile and leaves or breaks from the steel sheet pile,
I have a,
The closing member is formed of an elongated metal body along the longitudinal direction, and a part of the metal body is on the claw part of the joint part and the other part of the metal body is on the tip side of the flange part. A steel sheet pile characterized by being attached by welding . Wherein the upper end portion of the closing member, steel sheet pile according to claim 1, wherein the forming the peeling starting portion which is bent or curved in a direction away against toe side of the opening of the joint portion. A steel sheet pile impermeable wall constructed by connecting a plurality of adjacent steel sheet pile joints, having a plurality of steel sheet piles,
A steel sheet pile impermeable wall, wherein the steel sheet pile is the steel sheet pile according to claim 1 or 2 . A steel sheet pile used for a steel sheet pile having a plate-shaped web portion, a flange portion provided at a side end portion of the web portion, and a Larzen type joint portion formed at a distal end portion of the flange portion. It is a construction method,
A water stop material for stopping water between the joint part and a joint part of another steel sheet pile fitted to the joint part extends in the longitudinal direction of the web part inside the joint part. A mounting process for mounting;
A part of the closing member formed of a long and thin metal body along the longitudinal direction is attached to the claw part of the joint part, and the other part of the closing member is attached to the distal end side of the flange part by welding. A closing step of closing the opening on the toe side of the joint portion by a member;
A preceding placing step of placing a preceding steel sheet pile into the ground while preventing the ground structure from entering the inside of the joint portion through the opening on the toe side of the joint portion by the closing member;
After completion of the preceding placing step, the subsequent steel sheet pile is placed in the ground while fitting the joint portion of the subsequent steel sheet pile to the joint portion of the preceding steel sheet pile, and according to the movement of the subsequent steel sheet pile in the placing direction. A subsequent placing step of gradually peeling or breaking the blocking member from the preceding steel sheet pile by a joint portion of the subsequent steel sheet pile;
A method for placing a steel sheet pile, comprising:

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