JP2017180047A - Reinforcement structure and reinforcement method for existing steel pile wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcement structure and a reinforcement method for existing steel pile wall, in which members to be used are easily produced and establishment may be easily carried out.SOLUTION: There is provided a reinforcement structure for an existing steel pile wall comprising alternately successive recessed parts and projecting parts with a U shape steel pile or a hat shape steel pile, in which a steel plate with a rib or a reinforcement iron bar cage, or both of them are arranged at a position contacting to the recessed parts on the existing steel pile wall or a position away from them, a new steel pile wall of a straight steel pile is arranged away from the projecting parts on the existing steel pile wall, and a gap between the existing steel pile wall and the new steel pile wall is filled up with filler.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a reinforcing structure and a reinforcing method for an existing steel sheet pile wall.

  In harbors and rivers, steel sheet pile revetment structures using U-shaped steel sheet piles or hat-shaped steel sheet piles have become widespread. There is a concern that the sheet pile will deteriorate over time and the structural performance of the steel sheet pile revetment (existing steel sheet pile wall) will deteriorate.

  As a reinforcing measure for the existing steel sheet pile wall that has deteriorated over time, a method of constructing a new wall on the shore side (front side) of the existing steel sheet pile wall is generally used.

  Regarding the construction of a new wall, there is a construction of a steel sheet pile wall (conventional example 1) shown in FIG. If the existing steel sheet pile wall deteriorates due to corrosion or breakage and the specified performance is impaired, steel sheet pile walls with the same performance are placed facing each other on the shore side, and sand and sand are placed between both steel sheet pile walls. Stuff.

  This Patent Document 1 also has a method of repairing an old revetment using a wide (width: over 800 mm) wall member formed by previously joining a steel sheet pile with a wide panel and an H-shaped steel. It has been proposed (conventional example 2, patent document 1 FIG. 2).

JP 2003-074038 A

  In the method of Conventional Example 1, the structural performance necessary for revetment can be recovered. However, because the newly constructed steel sheet pile wall overhangs at the water's edge, there is a risk of increasing the risk of flooding by narrowing the width of the river. There is. Therefore, it is necessary to restore the structural performance necessary for the revetment and at the same time suppress the overhang of the newly installed steel sheet pile wall to the revetment front as much as possible.

  In this respect, Conventional Example 2 combines wide panel-shaped steel sheet piles and combines the existing steel sheet pile wall and the newly installed steel sheet pile wall, and the overhang of the newly installed steel sheet pile wall toward the waterside is suppressed. However, Conventional Example 2 has the following problems to be improved.

  (1) In the conventional example 2, it is necessary to join the wide sheet-shaped steel sheet pile, the H-shaped steel (or T-steel), and the joint member in advance by welding or bolts when constructing a new steel sheet pile wall. Since assembly is performed, time, labor, and cost are increased, and it is not an economical repair (reinforcement) method (manufacturing difficulty, economical difficulty). Further, there is a risk that the member is deformed and the quality is deteriorated at the time of joining, and thus further correction work may be required.

(2) Because it is difficult to transport large sheet steel sheet piles (especially, it may be subject to significant route restrictions when transporting via ordinary roads), As a result, it is necessary to assemble the new steel sheet pile wall members frequently. (Construction difficulty 1)
(3) Since a large cross-section member formed by joining a steel sheet pile with a wide panel and H-shaped steel, etc. is driven to the bottom of the ground, the penetration resistance to the ground during construction is large, and large construction machines It is necessary and requires a very large construction space. (Construction difficulty 2)
(4) Furthermore, among the members of the new steel sheet pile wall, there is a large difference in cross-sectional rigidity between the “H-shaped steel mounting part” and the “wide panel only part”. It becomes difficult. In addition, in the “part having only the wide panel” having a small rigidity, there is a possibility that it may be damaged such as bending during construction due to the influence of the construction of the H-shaped steel mounting part, and there is a concern that the quality may also be problematic. (Construction difficulty 3)
The present invention has been made in view of the above problems. It is an object of the present invention to provide a reinforcing structure and a reinforcing method for an existing steel sheet pile wall that facilitates the manufacture of members to be used and facilitates the construction.

  In order to solve the above-mentioned problems, the present inventors have made extensive studies and have obtained the following knowledge.

  If a generally manufactured straight steel sheet pile, ribbed steel plate, and reinforcing steel bar are used, complicated assembly and correction in advance are unnecessary, and the time, labor, and cost for constructing the reinforcing structure can be reduced.

  Moreover, since the linear steel sheet pile, the steel plate with ribs, and the reinforcing steel bar can be stacked and transported, efficient transport is possible, and complicated assembly work and frequent longitudinal joining work can be omitted.

  If a straight steel sheet pile, ribbed steel plate, and reinforced steel cage are each constructed, the construction accuracy increases and the risk of damage during placement can be minimized. Moreover, it can be handled by a conventional construction machine, and the construction space for constructing the reinforcing structure can be reduced.

  A new steel sheet pile wall made of straight steel sheet piles, ribbed steel plates and reinforcing steel bars, and filled concrete or soil cement are integrated to resist earth pressure and water pressure. A sufficiently large structural performance can be obtained. Moreover, the overhanging of the newly installed wall portion toward the waterside can be suppressed.

  The present invention has been completed through further studies based on these findings. The gist of the present invention is as follows.

[1] A reinforcing structure of an existing steel sheet pile wall in which concave portions and convex portions are alternately continued by a U-shaped steel sheet pile or a hat-shaped steel sheet pile,
A ribbed steel plate or a reinforcing steel cage, or both, are arranged at a position slightly in contact with the concave portion of the existing steel sheet pile wall,
A little apart from the convex part of the existing steel sheet pile wall, a new steel sheet pile wall with a linear steel sheet pile is arranged,
A reinforcing structure for an existing steel sheet pile wall, in which a filler is filled between the existing steel sheet pile wall and the new steel sheet pile wall.

[2] The lower end of the ribbed steel plate or the reinforcing steel bar is disposed at the bottom of the water, or is embedded in the bottom of the water,
The reinforcing structure of an existing steel sheet pile wall according to [1], wherein the linear steel sheet pile is cast on a water bottom ground.

  [3] The reinforcing structure of the existing steel sheet pile wall according to [1] or [2], wherein the new steel sheet pile wall has a shear connector.

[4] A new steel sheet pile wall is placed by placing a straight steel sheet pile on the bottom of the bottom of the existing steel sheet pile wall with U-shaped steel sheet piles or hat-shaped steel sheet piles. And a process of
Between the existing steel sheet pile wall and the newly installed steel sheet pile wall, contact the concave portion of the existing steel sheet pile wall, or dispose a ribbed steel plate or a reinforcing steel bar cage, or both And a process of
A method of reinforcing an existing steel sheet pile wall, including a step of filling a filler with the newly-installed steel sheet pile wall as a mold.

[5] A step of placing a new steel sheet pile wall by placing a straight steel sheet pile on the ground behind an existing steel sheet pile wall in which concave portions and convex portions are alternately continuous by a U-shaped steel sheet pile or a hat-shaped steel sheet pile; ,
A step of excavating the ground portion where the ribbed steel plate or the reinforcing steel bar between the existing steel sheet pile wall and the new steel sheet pile wall, or both are poured, and at the same time forming a soil cement ground by injecting cement milk;
Placing the steel plate with ribs and / or reinforcing steel bars at a predetermined position slightly away from the recesses of the existing steel sheet pile wall before the soil cement ground is solidified, and reinforcing the existing steel sheet pile wall Construction method.

  The present invention provides a reinforcing structure and a reinforcing method for an existing steel sheet pile wall, in which the members to be used can be easily manufactured and can be easily constructed. The present invention makes it possible to repair an existing steel sheet pile wall that has deteriorated due to corrosion or breakage due to aging, or to improve seismic resistance.

  The present invention is excellent in manufacturability, economy, and workability, has sufficient structural performance as a wall body, and can suppress overhang of a newly installed wall portion toward the waterside. Therefore, the present invention is a reinforcing structure and a reinforcing method capable of reducing the influence on the periphery.

FIG. 1 is a drawing for explaining an embodiment of the present invention. FIG. 2 is a drawing for explaining the arrangement and insertion of the lower ends of the ribbed steel plates and the reinforcing steel bars in one embodiment of the present invention. FIG. 3 is a drawing for explaining a modification of one embodiment of the present invention. FIG. 4 is a drawing for explaining a modification of one embodiment of the present invention. FIG. 5 is a drawing for explaining a modification of one embodiment of the present invention. One having a rib only on one side (a) and one having ribs on both sides (b) are shown. FIG. 6 is a drawing for explaining a modification of one embodiment of the present invention. FIG. 7 is a drawing for explaining another embodiment of the present invention. FIG. 8 is a diagram for explaining another embodiment of the present invention. FIG. 9 is a diagram illustrating another embodiment of the present invention. FIG. 10 is a diagram for explaining the first embodiment. FIG. 11 is a diagram for explaining a second embodiment. FIG. 12 is a diagram for explaining the third embodiment. FIG. 13 is a diagram for explaining the fourth embodiment. FIG. 14 is a diagram for explaining the fifth embodiment. FIG. 15 is a diagram for explaining the sixth embodiment.

  Hereinafter, embodiments of the present invention including the best mode will be described. In the following description of the embodiment, the illustration of the end portion of the reinforcing structure is omitted. What is necessary is just to determine the structure of an edge part suitably in view of construction conditions.

  FIG. 1 shows an embodiment of the present invention. In the existing steel sheet pile wall 10, the protrusion to the new steel sheet pile wall 1 side is convex and the protrusion to the opposite side is concave. The ribbed steel plate 3 and the reinforcing steel bar 6 are arranged at a position slightly away from the concave portion 11 of the existing steel sheet pile wall 10, and the new steel by the linear steel sheet pile 2 is slightly separated from the convex portion 12 of the existing steel sheet pile wall 10. A sheet pile wall 1 is disposed, and the existing steel sheet pile wall 10 and the new steel sheet pile wall 1 are filled with concrete 4 or soil cement 4 as a filler. The ribbed steel plate 3 and the reinforcing steel bar 6 are disposed in each recess 11 of the existing steel sheet pile wall 10. The ribbed steel plate 3 and the reinforcing steel bar 6 are not in contact with the newly installed steel sheet pile wall 1. In this reinforcing structure, on the side of the existing steel sheet pile wall 10, the linear steel sheet pile 2 is placed on the bottom of the ground and the new steel sheet pile wall 1 is arranged. The existing steel sheet pile wall 10 and the new steel sheet pile wall 1 are After placing the ribbed steel plate 3 and the reinforcing steel bar 6 at a position slightly away from the concave portion 11 of the existing steel sheet pile wall 10, the filler is filled with the new steel sheet pile wall 1 as a mold frame. Can be built.

  The existing steel sheet pile wall 10 is comprised by the U-shaped steel sheet pile, and is a structure by which a recessed part and a convex part continue alternately. The existing steel sheet pile wall 10 may be constituted by a hat-shaped steel sheet pile, and may have both a part made of a U-shaped steel sheet pile and a part made of a hat-shaped steel sheet pile.

  The rib of the ribbed steel plate 3 functions as a shear connector with a filler such as concrete 4 or soil cement 4 and is integrated with the new steel sheet pile wall 1 and the reinforcing steel bar cage 6 so as to become a strong wall. Required. The rib shape is not particularly limited, and is preferably a vertical stripe rib, a horizontal stripe rib, an oblique stripe rib, a checker rib, etc., more preferably a horizontal stripe rib (perpendicular to the depth direction of the steel sheet) from the viewpoint of exhibiting a shear connector function. Ribs are provided). The reason why the horizontal stripe rib is more suitable is that the bearing resistance resistance area of the rib is the highest for the vertical (depth direction) shift between the steel plate and concrete or soil cement caused by the bending moment acting on the wall. This is because it becomes effective. Moreover, the rib may be provided in the single side | surface of the steel plate 3 with a rib, and may be provided in both surfaces. The size of the steel plate 3 with ribs can be appropriately selected in view of the contents of construction, and is preferably 150 to 500 mm in width and 10 to 70 mm in thickness (including rib height). In FIG. 1, one ribbed steel plate 3 is disposed in the recess 11, but the number of ribbed steel plates 3 may be increased as appropriate. In this case, the ribbed steel plates 3 may be in contact with each other or joined together, or may be separated from each other.

  In addition, as a method for fixing the filler such as the concrete 4 or the soil cement 4 and the steel plate 3 with ribs more firmly, there is a typical method of attaching a deformed reinforcing bar or a stud gibber.

  The reinforcing steel bar 6 usually includes a main bar arranged in the depth direction and a hoop bar that binds the main bars. The shape of the reinforcing steel bar 6 as viewed from the upper surface side of the reinforcing structure can be appropriately selected. From the viewpoint of improving rigidity, a shape having a bottom surface of the existing steel sheet pile wall 10 and a surface facing the newly installed steel sheet pile wall 1 is preferable. Preferred shapes include, for example, a trapezoid, a quadrangle, and a circle, and more preferably a quadrangle as shown in FIG. The size of the reinforcing bar cage 6 and the interval at which the hoop bars are provided can be appropriately selected in view of the construction contents.

  The ribbed steel plate 3 and the reinforcing steel bar cage 6 are preferably disposed in each recess 11 of the existing steel sheet pile wall 10 as shown in FIG. In addition, it is good also as arrange | positioning the steel plate 3 with a rib, or the reinforcing steel bar 6 in the recessed part 11. FIG.

  What is necessary is just to determine the relative arrangement | positioning relationship of the steel plate 3 with a rib arrange | positioned in the recessed part 11, and the reinforcing steel bar 6 suitably. From the viewpoint of improving the rigidity, it is preferable that the ribbed steel plate 3 and the bottom surface of the existing steel sheet pile wall 10 are arranged to face each other. For the same reason, it is preferable to arrange the side surfaces of the reinforcing steel bars 6 and the bottom surfaces of the recessed portions 11 of the existing steel sheet pile wall 10 to face each other.

  When the ribbed steel plate 3 and / or the reinforcing steel bar 6 is disposed at a position slightly away from the concave portion 11 of the existing steel sheet pile wall 10, the filler 4 such as concrete 4 or soil cement 4 wraps around the gap. It is necessary to secure clearance. For example, it is preferable that the recess 11 and the ribbed steel plate 3 or the reinforcing steel bar 6 are separated from each other by at least 20 mm on the basis of the height position of the head of the ribbed steel plate 3 or the reinforcing steel bar 6 closest to the bottom surface of the concave part 11. . In order to reduce the clearance, it is preferable to use a high fluidity mortar material as a filler.

  The linear steel sheet pile 2 has joint portions at both ends, and the joint portions can be fitted to each other. The position of the new steel sheet pile wall 1 formed by combining the straight steel sheet piles 2 is such that concrete 4 or soil cement 4 is filled in the gaps between the convex portions 12 of the existing steel sheet pile wall 10, the steel plate 3 with ribs and the reinforcing steel bar 6. It is necessary to secure a clearance that allows the material to go around. The distance from the convex portion 12 of the existing steel sheet pile wall 10 to the position of the new steel sheet pile wall 1 (in the direction perpendicular to the seawall normal) is set at 50 mm or more in consideration of variations in construction accuracy of steel sheet piles and joint shapes. Is desirable. On the other hand, the distance from the convex part 12 of the existing steel sheet pile wall 10 to the position of the newly installed steel sheet pile wall 1 is preferably 500 mm or less from the viewpoint of suppressing the overhang of the wall portion toward the waterside.

  In the present invention, a known linear steel sheet pile can be used as appropriate. The size of the linear steel sheet pile 2 is preferably an effective width L = 700 mm or less, more preferably an effective width L = 600 mm or less. On the other hand, from the viewpoint of ensuring the rigidity of the new steel sheet pile wall and efficient construction, the effective width L of the linear steel sheet pile is preferably 400 mm or more. The effective width L is the distance between the joint centers.

  As shown in FIG. 2, it is sufficient that the casting length (in the depth direction) of the linear steel sheet pile 2 is the same as the length of the existing steel sheet pile wall 10, but depending on the ground conditions and the like, It is also possible to make the casting length shorter. In the present invention, since the new steel sheet pile wall 1 is formed by the linear steel sheet pile 2, an appropriate number of joint portions between the linear steel sheet piles 2 can be secured, and for example, even in a landform having a curve such as a curved portion of a river Easy to adapt.

  In order to increase the rigidity of the new steel sheet pile wall 1, the ribbed steel plate 3 and the reinforcing steel bar 6 usually have their lower end positions at or near the bottom as shown in FIG. 2. If it is shallower than that, there will be insufficient resistance to the load (bending moment) acting on the newly installed steel sheet pile wall 1 near the bottom of the water bottom, and there is a possibility that large deformation will occur. Preferably, the lower ends of the ribbed steel plate 3 and the reinforcing steel bar 6 are rooted in the water bottom ground. In the present invention, the new steel sheet pile wall 1, the steel plate 3 with ribs, and the reinforcing steel bar 6 are not connected. Therefore, the built-in depth of the newly installed steel sheet pile wall 1, the steel plate 3 with ribs, and the reinforcing steel bar 6 can be different from each other. In particular, the embedding depth of each ribbed steel plate 3 and the reinforcing steel bar cage 6 can be adjusted as appropriate in view of the situation of the submerged ground.

  Usually, in order to maintain the integrity of the new steel sheet pile wall 1 and the ribbed steel plate 3 or the reinforcing steel bar 6, the filler such as the filled concrete 4 (or soil cement 4) is used as the ribbed steel plate 3 or the reinforcing steel bar. Fill to the same depth as the lower end of the car 6 or deeper. If the filling depth of the filler is shallow, the resistance to the load (bending moment) acting on the new steel sheet pile wall 1 becomes insufficient, and a large deformation may occur.

  In the present invention, the filler can be appropriately selected in view of the construction environment. For example, as the filler, sand, gravel, viscous soil, a time-curable material, or a mixture thereof can be used. The filler is preferably a time-curable material. Examples of the time-curable material include concrete, soil cement, high flow mortar, and curable chemical solution. What is necessary is just to determine suitably the filling method of a filler in view of the filler to be used. For example, when using concrete as a filler, it fills up using a treme tube while being launched from the bottom.

When the water bottom ground on the shore side is soft, the ground improvement is carried out and combined with the structure of the present invention, it is possible to suppress the risk of revetment deformation due to working earth pressure and the risk of revetment deformation during the action of an earthquake external force.
Modifications of the embodiment shown in FIG. 1 are shown in FIGS. FIG. 3 is an example in which the ribbed steel plate 3 is disposed in each recess 11 of the existing steel sheet pile wall 10. FIG. 4 shows an example in which reinforcing steel bars 6 are arranged in the respective recesses 11 of the existing steel sheet pile wall 10. FIG. 5 shows that a ribbed steel plate 3 and a reinforcing steel bar 6 are arranged in each recess 11 of an existing steel sheet pile wall 10, and a steel plate with a rib inside the reinforcing steel bar 6 (one having ribs on one side (a), both sides This is an example in which (b)) having ribs is arranged. In this case, if the ribbed steel sheet 3 is provided with double-sided ribs, the fixing effect may be further enhanced. FIG. 6 shows that the ribbed steel plate 3 and the reinforcing steel bar 6 are arranged in each recess 11 of the existing steel sheet pile wall 10, and the reinforcing bars 7 and the power reinforcing bars 7 connecting the reinforcing steel bars 6 are further in the axial direction. 8 is an example.
The configuration shown in FIGS. 1, 3, and 4 is preferably used according to the degree of damage to the existing steel sheet pile wall 10 and the strength of the wall required for design. When the degree of damage of the existing steel sheet pile wall 10 is small, it can be handled by the relatively simple method shown in FIGS. When the degree of damage of the existing steel sheet pile wall is large and the proof stress of the existing steel sheet pile cannot be expected so much, it is preferable to reinforce the structure by using the reinforcing steel bar 6 and the ribbed steel plate 3 together as shown in FIG.
In the configuration shown in FIG. 5, since the ribbed steel plate 3 is disposed inside the reinforcing steel bar 6, a restraining effect is obtained and the rigidity is further improved. In the configuration shown in FIG. 6, since the reinforcing bars 6 are connected to each other and the axial reinforcing bars 8 are provided, the wall strength is further improved. Thus, this invention can respond also to reinforcement of a large sized existing steel sheet pile wall.

  FIG. 7 shows another embodiment of the present invention. The shear connector 5 is used for fixing with a filler such as concrete 4 or soil cement 4. In this embodiment, a shear connector 5 for fixing a filler such as concrete 4 or soil cement 4 is provided on a new steel sheet pile wall 1 in the reinforcing structure shown in FIG.

  As the shear connector 5, there is a typical method using a deformed reinforcing bar or a stud gibber. Further, a protrusion shape may be provided on the linear steel sheet pile 2 and the protrusion may be used as the shear connector 5. Any other shear connector 5 may be used as long as it can meet the above purpose.

  When using a deformed reinforcing bar as the shear connector 5 of the new steel sheet pile wall 1, it is naturally attached to a surface (surface filled with a filler) facing the existing steel sheet pile wall 10. Usually, after attaching the shear connector 5 to the linear steel sheet pile 2, the new steel sheet pile wall 1 is constructed. In order to sufficiently fix the filler such as concrete 4 or soil cement 4, the number of attachment points of the deformed reinforcing bars is preferably two or more, and the attachment position needs to be determined in consideration of the gripping position of the placing machine. Further, the size of the deformed reinforcing bar to be attached is preferably D10 to D19 (numbers are the reinforcing bar diameter, unit mm), but may be larger if there is no problem in construction. The attachment range of the deformed reinforcing bar in the depth direction may be up to the placement depth position of the filler.

  Furthermore, if the shear connector 5 is attached to the waterside side (front surface) of the existing steel sheet pile wall 10 and then filled with a filler such as concrete 4 or soil cement 4, more reliable integration can be expected, and a reinforcing structure can be obtained. Can be stronger.

  Also in this embodiment, it is possible to take the same form as the modification of the embodiment shown in FIGS.

  FIG. 8 shows another embodiment of the present invention. In embodiment shown in FIG. 8, the linear steel sheet pile 22 with a stripe rib which provided the stripe rib in the existing steel sheet pile wall 10 side of the linear steel sheet pile 2 is used. Since the fixing with the filler such as the concrete 4 or the soil cement 4 can be achieved by the striped rib, it has the same structural performance as the case where the shear connector 5 is provided.

  FIG. 9 shows another embodiment according to the present invention. A significant difference from the above-described embodiment is that the new steel sheet pile wall 1 is disposed on the back ground side. That is, in the embodiment of FIG. 9, the straight steel sheet pile 2 is placed on the ground behind the existing steel sheet pile wall 10 in which concave portions and convex portions are alternately formed by U-shaped steel sheet piles or hat-shaped steel sheet piles. Place the steel sheet pile wall 1 and then excavate the ground part where the steel plate with ribs and / or reinforcing steel bars between the existing steel sheet pile wall 10 and the newly installed steel sheet pile wall 1 or both are excavated, and cement milk is injected at the same time. After forming the cement ground and then solidifying the soil cement ground, a steel plate with ribs and / or reinforcing steel bars, or both, are arranged at a predetermined position slightly away from the recess 11 of the existing steel sheet pile wall 10 to reinforce the structure. And According to the present embodiment, no overhang to the shore side occurs, and the conventional river width and harbor water area are not narrowed. As shown in FIG. 9, a ribbed steel plate 3 and / or a reinforcing steel bar cage 6 are used for the configuration that “the filler is filled between the existing steel sheet pile wall 10 and the new steel sheet pile wall 1”. It includes a configuration in which only the ground portion to be arranged is filled with the filler.

  In addition, when there is a concern about deformation of the existing steel sheet pile during ground excavation, the existing steel sheet pile wall 10 and the head of the newly installed steel sheet pile wall 1 are combined, a support work is provided, etc. Measures should be taken in advance.

  Also in this embodiment, it is possible to take the same form as the modification of the embodiment shown in FIGS.

  Examples of the present invention will be described below. The technical scope of the present invention is not limited to the following examples. In the following description of the embodiments, the drawings are schematic, and the scale of each member is not necessarily accurate.

Example 1
FIG. 10 is a diagram for explaining the first embodiment. In this embodiment, a U-4 steel sheet pile is used as the existing steel sheet pile wall 10, a straight steel sheet pile 2 (effective width L = 500 mm) is provided on the new steel sheet pile wall 1, and a ribbed steel sheet 3 is provided. The width 250 × thickness 19 mm size, the cross-sectional size of the reinforcing steel bar 6 is 320 mm (in the direction normal to the wall normal) × 290 mm (in the direction normal to the wall), D22 is used for the main bar, and D13 is used for the hoop bar. . D16 is used for the deformed reinforcing bar of the shear connector 5.

  The overhang of the new steel sheet pile wall to the waterside is 80 mm. The depth from the water surface to the bottom of the water is 4 m, the penetration length of the steel plate 3 with ribs is 1 m, and the penetration depth of the reinforcing steel bar 6 is 1 m. The straight steel sheet pile 2 was cast to a depth of 3 m.

(Example 2)
FIG. 11 is a diagram for explaining the second embodiment. In this embodiment, a U-3 steel sheet pile is used as the existing steel sheet pile wall 10, a straight steel sheet pile 2 (effective width L = 500 mm) is provided on the new steel sheet pile wall 1, and the ribbed steel sheet 3 is The width is 240 × thickness is 13 mm, the cross section of the reinforcing steel bar 6 is 240 mm (in the direction perpendicular to the wall normal) × 280 mm (in the direction normal to the wall), D16 is used for the main bar, and D13 is used for the hoop bar. . D13 is used for the deformed reinforcing bar of the shear connector 5.

  The overhang of the new steel sheet pile wall to the waterside is 70 mm. The depth from the water surface to the bottom of the water is 2.5 m, the ribbed steel sheet 3 has a depth of 0.5 m, and the reinforcing steel bar 6 has a depth of 0.5 m. The straight steel sheet pile 2 was driven up to a penetration length of 2 m.

(Example 3)
FIG. 12 is a diagram for explaining the third embodiment. In this embodiment, a U-4W type steel sheet pile is used as the existing steel sheet pile wall 10, a straight steel sheet pile 2 (effective width L = 500 mm) is provided on the new steel sheet pile wall 1, and the ribbed steel plate 3 is The width 320 × thickness 25 mm size, the cross-sectional size of the reinforcing steel bar 6 is 380 mm (in the direction normal to the wall normal) × 360 mm (in the direction normal to the wall), D29 is used for the main bar, and D13 is used for the hoop bar. . D19 is used for the deformed reinforcing bar of the shear connector.

  The overhang of the new steel sheet pile wall to the waterside is 80 mm. The depth from the water surface to the bottom of the water is 5 m, the penetration length of the ribbed steel plate 3 is 1 m, and the penetration depth of the reinforcing steel bar 6 is 1 m. The straight steel sheet pile 2 was driven to a depth of 3.5 m.

Example 4
FIG. 13 is a diagram for explaining the fourth embodiment. In this embodiment, a U-4 steel sheet pile is used as the existing steel sheet pile wall 10, a straight steel sheet pile 2 (effective width L = 500 mm) is provided on the new steel sheet pile wall 1, and a ribbed steel sheet 3 is provided. The width 200 × thickness 19 mm size, the cross-sectional size of the reinforcing steel bar 6 is 320 mm (perpendicular to the normal to the wall normal) × 250 mm (perpendicular to the wall normal), D22 is used for the main reinforcement, and D13 is used for the hoop reinforcement. . D16 is used for the deformed reinforcing bar of the shear connector 5.

(Example 5)
FIG. 14 is a diagram for explaining the fifth embodiment. In this embodiment, a U-4 steel sheet pile is used as the existing steel sheet pile wall 10, a straight steel sheet pile 2 (effective width L = 500 mm) is provided on the new steel sheet pile wall 1, and a ribbed steel sheet 3 is provided. The width 250 × thickness 29 mm size is used.

  The overhang of the new steel sheet pile wall to the waterside is 50 mm. The depth from the water surface to the bottom of the water is 4 m, the penetration length of the steel plate 3 with ribs is 1 m, and the penetration depth of the reinforcing steel bar 6 is 1 m. The straight steel sheet pile 2 was cast to a depth of 3 m.

(Example 6)
FIG. 15 is a diagram for explaining the sixth embodiment. In this embodiment, a U-4 type steel sheet pile is used as the existing steel sheet pile wall 10, and a straight steel sheet pile 2 (effective width L = 500 mm) is provided on the newly installed steel sheet pile wall 1. The cross-sectional size is 320 mm (perpendicular to the wall normal) × 290 mm (perpendicular to the wall normal), D29 is used for the main muscle, and D13 is used for the hoop.

  The overhang of the new steel sheet pile wall to the waterside is 80 mm. The depth from the water surface to the bottom of the water is 4 m, the penetration length of the steel plate 3 with ribs is 1 m, and the penetration depth of the reinforcing steel bar 6 is 1 m. The straight steel sheet pile 2 was cast to a depth of 3 m.

DESCRIPTION OF SYMBOLS 1 New steel sheet pile wall 2 Straight-shaped steel sheet pile 3 Steel plate 4 with a rib 4 Concrete or soil cement 5 Shear connector 6 Reinforcing bar cage 7 Reinforcement bar 8 Axial reinforcement 10 Existing steel sheet pile wall 11 Recess 12 Protrusion 22 Straight line with stripe rib Steel sheet pile

Claims (5)

A U-shaped steel sheet pile or a hat-shaped steel sheet pile, which is a reinforcing structure of an existing steel sheet pile wall in which concave portions and convex portions are alternately continuous,
A ribbed steel plate or a reinforcing steel cage, or both, are arranged at a position slightly in contact with the concave portion of the existing steel sheet pile wall,
A little apart from the convex part of the existing steel sheet pile wall, a new steel sheet pile wall with a linear steel sheet pile is arranged,
A reinforcing structure for an existing steel sheet pile wall, in which a filler is filled between the existing steel sheet pile wall and the new steel sheet pile wall. While the lower end of the ribbed steel plate or the reinforcing steel bar is disposed at the bottom position, or is embedded in the bottom floor,
The reinforcing structure of the existing steel sheet pile wall according to claim 1, wherein the linear steel sheet pile is cast on a water bottom ground. The reinforcement structure of the existing steel sheet pile wall of Claim 1 or 2 with which the said new steel sheet pile wall has a shear connector. A process of placing a new steel sheet pile wall by placing a straight steel sheet pile on the bottom of the bottom of the existing steel sheet pile wall where concave portions and convex portions are alternately continuous with a U-shaped steel sheet pile or a hat-shaped steel sheet pile, and ,
Between the existing steel sheet pile wall and the newly installed steel sheet pile wall, contact the concave portion of the existing steel sheet pile wall, or dispose a ribbed steel plate or a reinforcing steel bar cage, or both And a process of
A method of reinforcing an existing steel sheet pile wall, including a step of filling a filler with the newly-installed steel sheet pile wall as a mold. A process of placing a new steel sheet pile wall by placing a straight steel sheet pile on the ground behind the existing steel sheet pile wall in which concave portions and convex portions are alternately continuous by a U-shaped steel sheet pile or a hat-shaped steel sheet pile;
A step of excavating the ground portion where the ribbed steel plate or the reinforcing steel bar between the existing steel sheet pile wall and the new steel sheet pile wall, or both are poured, and at the same time forming a soil cement ground by injecting cement milk;
Placing the steel plate with ribs and / or reinforcing steel bars at a predetermined position slightly away from the recesses of the existing steel sheet pile wall before the soil cement ground is solidified, and reinforcing the existing steel sheet pile wall Construction method.

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