Formwork structure, steel sheet pile wall repair method

Abstract

To provide a novel form structure which facilitates form construction work when a steel sheet pile wall is repaired, and a novel steel sheet pile wall repairing method.SOLUTION: A form structure 1 for repairing a steel sheet pile wall 2 comprises: the steel sheet pile wall 2; rod-like separators 3 erected at a plurality of places of the steel sheet pile wall 2; and a form 4 having a plurality of support holes 5 through which the separators 3 are inserted. The hole sizes (r) of the support holes 5 are set sufficiently larger than the outer diameters (φ) of the separators 3, and the support holes 5 are covered with cover materials 10 fitted to the separators 3.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a formwork structure for repairing a steel sheet pile wall and a steel sheet pile wall repair method. [Background technology]

[0002] Some seawalls, quays, revetments, etc. are formed by continuously driving steel sheet piles into the seawalls for their ease of construction and economic efficiency. Many of these steel sheet pile walls have deteriorated over the decades since their construction, and so a technique has been proposed for repairing deteriorated steel sheet pile walls to prevent corrosion and extend the service life of waterway facilities, etc. (see, for example, Patent Document 1 below). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2017-180075 A Summary of the Invention [Problem to be solved by the invention]

[0004] The above-mentioned Patent Document 1 discloses a method of repairing an existing steel sheet pile wall by placing a panel material facing the front of the existing steel sheet pile wall and filling a filler such as concrete into the space formed between the steel sheet pile wall and the panel material.

[0005] When a steel sheet pile wall is repaired by the repair method disclosed in Patent Document 1, the panel material forms a new wall surface, so it is necessary to select the material of the panel material and to provide a reliable means for fixing the panel material. Therefore, when repairing a steel sheet pile wall, a common method is to place a formwork facing the front of the steel sheet pile wall, fill the space between the steel sheet pile wall and the formwork with ready-mixed concrete, and then remove the formwork to form a new concrete retaining wall.

[0006] In this repair method, first, as shown in Fig. 8, a formwork 4 is temporarily fixed via rod-shaped separators 3 erected at multiple points on an existing steel sheet pile wall 2. At this time, the separators 3 are inserted into support holes 5 provided in the formwork 4. A positioning tool 6 such as a plastic cone (P-con) is attached to the separator 3, and the formwork 4 is positioned in a state where it is in contact with the positioning tool 6.

[0007] Next, as shown in Fig. 9, the formwork 4 is fixed with vertical butters 7 and horizontal butters 8, and then fresh concrete is poured through a pouring pipe 9 attached to the formwork 4. Since there is a limit to the height to which the fresh concrete can be poured, the fresh concrete is first poured using the pouring pipe 9 attached below the formwork 4, and then the upper pouring pipes 9 are used in sequence according to the amount of fresh concrete to be poured.

[0008] After the filled fresh concrete has hardened, the formwork 4 is removed and the required work is carried out to smooth out any unevenness on the surface, completing the construction of a concrete retaining wall in which the existing steel sheet pile wall 2 has been repaired.

[0009] However, in order to prevent the fresh concrete from leaking from the support holes 5, it is necessary to set the difference in the hole dimension (r) of the support holes 5 provided in the formwork 4 relative to the thickness (φ) of the separator 3 as small as possible (for example, φ: 16 mm and r: 18 mm). Therefore, in an underwater working environment with currents and waves, it was very dangerous work for a diver to enter the formwork and insert multiple separators 3 into the specified support holes 5.

[0010] The present invention has been developed to solve the above-mentioned technical problems, and aims to provide a new formwork structure that makes formwork construction work safe and easy when repairing a steel sheet pile wall, and a new steel sheet pile wall repair method. [Means for solving the problem]

[0011] The formwork structure of the present invention for solving the above-mentioned technical problems is a formwork structure for repairing a steel sheet pile wall, and comprises the steel sheet pile wall, rod-shaped separators erected at multiple locations on the steel sheet pile wall, and a formwork having multiple support holes through which each separator is inserted, characterized in that the hole dimensions of the support holes are made sufficiently larger than the outer diameter of the separators, and the support holes are blocked by cover materials attached to each separator (hereinafter referred to as the "formwork structure of the present invention").

[0012] In the formwork structure of the present invention, a preferred embodiment is one in which the hole dimension of the support hole is at least twice the outer diameter of the separator.

[0013] In the formwork structure of the present invention, a preferred embodiment is one in which the opening shape of the support hole and the shape of the lid material are rectangular, and the lid material is sized so that it can be inserted and removed from the formwork through the support hole.

[0014] The steel sheet pile wall repair method of the present invention for solving the above-mentioned technical problems is a steel sheet pile wall repair method for repairing a steel sheet pile wall, which includes a separator erection process of erecting rod-shaped separators at multiple locations on the steel sheet pile wall, a positioning process of temporarily fixing a formwork to the separators, a formwork fixing process of fixing the formwork to the separators, and a pouring process of filling a filler into a space formed between the steel sheet pile wall and the formwork, and is characterized in that in the positioning process, the separators are pierced through support holes provided in the formwork, the hole dimensions of which are sufficiently larger than the outer diameter of the separators, and the support holes are sealed with cover materials attached to each separator (hereinafter referred to as the "repair method of the present invention").

[0015] In the repair method of the present invention, it is preferable that when the positioning step is carried out, the support hole above the formwork is left open, and during the pouring step, a hose for transporting filler is inserted into the space formed between the steel sheet pile wall and the formwork through the open support hole, and the hose is gradually pulled up while filling the filler. Effect of the Invention

[0016] According to the present invention, formwork construction work when repairing a steel sheet pile wall becomes safe and easy. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1(a) is a perspective view showing a formwork structure of the present invention, and FIG. 1(b) is an enlarged view showing a support hole portion in a cross-sectional state. [Diagram 2] FIG. 2 is a partially enlarged perspective view showing a separator erecting step in the repair method of the present invention. [Diagram 3] FIG. 3(a) is a perspective view showing how a lid is attached to a separator, and FIG. 3(b) is an enlarged cross-sectional view of the separator with the lid attached. [Figure 4] FIG. 4(a) is a perspective view showing a positioning step in the repair method of the present invention, and FIG. 4(b) is an enlarged view showing a support hole portion in a cross-sectional state. [Diagram 5] FIG. 5 is a perspective view showing a concrete pouring step in a repair method according to another embodiment of the present invention. [Figure 6] FIG. 6 is an enlarged cross-sectional view of a support hole portion of a formwork structure according to still another embodiment of the present invention. [Figure 7] FIG. 7(a) is a perspective view and (b) is a front view showing the dimensional relationship between the support hole and the lid. [Figure 8] FIG. 8(a) is a perspective view showing a formwork installation process in a conventional steel sheet pile repair method, and FIG. 8(b) is an enlarged view showing a support hole portion in a cross-sectional state. [Figure 9] FIG. 9(a) is a perspective view showing a form structure constructed by a conventional steel sheet pile repair method, and FIG. 9(b) is an enlarged view showing a support hole portion in a cross-sectional state. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to these embodiments.

[0019] <Formwork structure of the present invention (1)> Fig. 1 shows a formwork structure 1 of the present invention. The formwork structure 1 of the present invention comprises a "steel sheet pile wall (2)", a "separator (3)", and a "formwork (4)".

[0020] -Steel sheet pile wall 2- The steel sheet pile wall 2 is a continuous body of steel sheet piles, which is a type of large steel, with joints at both ends. The steel sheet pile wall 2 is constructed by driving steel sheet piles into the planned ground to protect against water pressure and earth pressure and to prevent the inflow and outflow and leakage of soil, groundwater, seawater, etc. In the present invention, the steel sheet pile wall 2 includes not only existing ones that require repair due to deterioration over time, but also newly constructed ones and ones that have not yet deteriorated.

[0021] -Separator 3- The separators 3 are rod-shaped bodies attached to a plurality of locations on the steel sheet pile wall 2. In this embodiment, a metal rod having a thread engraved on its surface is used as the separator 3. A plastic cone is attached to the separator 3 as a positioning tool 6, and a lid material 10 is placed so as to abut against the positioning tool 6. In this embodiment, the lid material 10 has an overall shape in which a through hole 11 is provided in the center of a flat iron plate, and the separator 3 is pierced through the through hole 11. The inner diameter of the through hole 11 is sized so as to be blocked by the seat of the positioning tool 6.

[0022] -Formwork 4- The formwork 4 is disposed facing the front of the steel sheet pile wall 2, and plays a role of forming a space for filling a filler between the steel sheet pile wall 2 and the formwork 4. The formwork 4 is provided with a plurality of support holes 5, and the formwork 4 is temporarily fixed in a state in which the separators 3 are inserted into the respective support holes 5, and is fixed in place using vertical butters 7 and horizontal butters 8.

[0023] The formwork structure 1 of the present invention having the above-mentioned configuration is constructed to repair an existing steel sheet pile wall 2, and a new retaining wall can be formed by filling a filler such as ready-mixed concrete into the space formed between the steel sheet pile wall 2 and the formwork 4, and removing the formwork 4 after the filler has hardened. In this embodiment, the filling of the filler is carried out through a pouring pipe 9 attached to the formwork 4.

[0024] In the formwork structure 1 of the present invention, the hole dimension (r) of the support hole 5 is sufficiently larger than the outer diameter (φ) of the separator 3, but since the support hole 5 is blocked by the cover material 10 attached to the separator 3, no filler leaks from the support hole 5.

[0025] <Repair method of the present invention> The repair method of the present invention is shown in Figures 2 to 4. The repair method of the present invention includes a "separator erecting step", a "positioning step", a "formwork fixing step", and a "casting step".

[0026] -Separator installation process- In the separator erection process, rod-shaped separators are erected at multiple locations on the steel sheet pile wall 2. As shown in Fig. 2, in this embodiment, a metal rod with threads on its surface is used as the separator 3, and the separator erection process is performed by welding the contact points between the separator 3 and the steel sheet pile wall 2. A plastic cone is attached to the separator 3 as a positioning tool 6, and a lid material 10 is placed so as to abut against the positioning tool 6, as shown in Fig. 3.

[0027] - Positioning process - In the positioning step, the formwork 4 is temporarily fixed to the separator 3. As shown in Fig. 4, in the repair method of the present invention, the positioning step is performed by piercing the separator 3 through the support hole 5 provided in the formwork 4. Also, in the repair method of the present invention, the hole dimension (r) of the support hole 5 is set sufficiently larger than the outer diameter (φ) of the separator 3, so that the operation of piercing the separator 3 through the support hole 5 can be performed relatively quickly. When the separator 3 is pierced through the support hole 5 and the formwork 4 is abutted against the lid material 10 attached to each separator 3, the support hole 5 is blocked by the lid material 10.

[0028] - Formwork fixing process - In the form fixing step, the form 4 is fixed to the separator 3. In this embodiment, the form fixing step is performed using vertical butters 7 and horizontal butters 8 (see FIG. 1).

[0029] - Pouring process - In the casting step, a filler is filled into the space formed between the steel sheet pile wall 2 and the formwork 4. In this embodiment, the casting step is performed by filling the space with ready-mixed concrete as a filler through a casting pipe 9 attached to the formwork 4.

[0030] In the repair method of the present invention, which performs each of the above steps, the hole dimension (r) of the support hole 5 is set sufficiently larger than the outer diameter (φ) of the separator 3, which facilitates the work of inserting the separator 3 into the support hole 5 and allows the positioning step to be performed relatively quickly. As a result, the repair method of the present invention facilitates the work of constructing formwork when repairing the steel sheet pile wall 2.

[0031] In the present embodiment, the filler is filled through the pouring pipe 9 attached to the formwork 4 in the pouring step, but as shown in Fig. 5, the support hole 5 above the formwork 4 can be left open during the positioning step, and a hose (H) for transporting the filler in the pouring step can be inserted into the space formed between the steel sheet pile wall 2 and the formwork 4 through the open support hole 5, and the hose (H) can be gradually pulled up while filling the filler. If the filler is filled using the hose (H), the number of pouring pipes 9 used, which were conventionally disposable, can be reduced, thereby reducing the operating costs.

[0032] In addition, in this embodiment, the support hole 5 is blocked by applying the cover material 10 to the support hole 5 from the back side of the formwork 4 (the side facing the steel sheet pile wall 2), but the support hole 5 may also be blocked by applying the cover material 10 to the support hole 5 from the front side of the formwork 4 as shown in Figure 6.

[0033] Furthermore, in this embodiment, the opening shape of the support hole 5 and the shape of the lid member 10 are rectangular, but there are no particular limitations on the opening shape of the support hole 5 and the shape of the lid member 10. The opening shape of the support hole 5 and the shape of the lid member 10 may be a polygon other than a rectangle, or may be a circle, an ellipse, or the like.

[0034] However, as shown in Figure 7, if the opening shape of the support hole 5 and the shape of the cover material 10 are rectangular and the dimensions of the cover material 10 are such that it can be moved in and out of the formwork 4 through the support hole 5, this is a preferred embodiment as it improves the workability of the repair method of the present invention.

[0035] In the present invention, the "hole dimension (r)" of the support hole 5 means the diameter of the opening of the support hole 5 if the opening shape of the support hole 5 is circular, and means the diameter of the maximum inscribed circle (the maximum circle surrounded by the support hole 5) if the opening shape of the support hole 5 is other than circular.

[0036] In the present invention, the hole dimension (r) of the support hole 5 is "set sufficiently larger" than the outer diameter (φ) of the separator 3 means that the hole dimension (r) is large enough to improve the workability of the positioning step. Specifically, it is preferable to set the hole dimension (r) of the support hole 5 to be at least twice (more preferably at least three times) the outer diameter (φ) of the separator 3.

[0037] The present invention can be implemented in various other forms without departing from its spirit or main features. Therefore, the above-described embodiments are merely illustrative in all respects and should not be interpreted as being limiting. The scope of the present invention is defined by the claims and is not limited to the text of the specification. Furthermore, all modifications and changes within the scope of the claims are within the scope of the present invention. [Industrial Applicability]

[0038] The present invention is suitably used as a means for repairing a steel sheet pile wall. [Explanation of symbols]

[0039] 1 Formwork structure of the present invention (formwork structure) 2 Steel sheet pile wall 3. Separator 4. Formwork 5 Support hole 6 Positioning tool 7. Vertical Butter 8. Horizontal butter 9 Casting pipe 10 Lid material

Claims

1. A formwork structure for repairing a steel sheet pile wall in an underwater work environment, The steel sheet pile wall; Rod-shaped separators erected at a plurality of positions on the steel sheet pile wall; a form having a plurality of support holes through which the separators are inserted; The present invention is provided with The support hole has a rectangular shape and a diameter of a maximum inscribed circle is two or more times the outer diameter of the separator, The support holes are covered by flat rectangular lids attached to each separator, A formwork structure characterized in that the lid material is sized so that it can be inserted and removed from the formwork by utilizing the diagonal spacing of the support holes.

2. A formwork construction method for constructing the formwork structure according to claim 1, comprising: a separator erection process of erecting rod-shaped separators at a plurality of positions on the steel sheet pile wall; a positioning step of temporarily fixing a form to the separator; a form fixing step of fixing the form to the separator; Run In the positioning step, the separator is inserted into a support hole provided in the formwork, the support hole having a rectangular shape and a hole dimension in which the diameter of the maximum inscribed circle is at least twice the outer diameter of the separator, and the support hole is closed with a flat rectangular cover material attached to each separator; A formwork construction method, characterized in that the cover material is sized so that it can be inserted and removed from the formwork by utilizing the diagonal spacing of the support holes.

3. A method for repairing a steel sheet pile wall using the formwork structure described in claim 1, A steel sheet pile wall repair method characterized by leaving a support hole above the formwork open, inserting a hose for transporting filler through the open support hole into the space formed between the steel sheet pile wall and the formwork, and gradually pulling up the hose while filling the filler.

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