JP5347898B2 - Strengthening structure and method of existing sheet pile quay - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reinforcing structure capable of appropriately and economically reinforcing an existing sheet pile quay wall. <P>SOLUTION: An L-shaped reinforcing structure is a reinforcing structure 30 installed for reinforcing the sheet pile quay wall 10 by using a steel pipe sheet pile 11. Its vertical cross section is L-shaped in the installed state. A vertical part 32 which consists of one side of the L-shaped cross section is connected and integrated with the steel pipe sheet pile 11 while a horizontal part 31 which consists of the other side of the L-shaped cross section is connected with a pile 21 which is driven so as to be opposite to the steel pipe sheet pile 11 in a position separated by a prescribed distance from the sheet pile quay wall 10. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an L-shaped reinforcing structure (L-shaped reinforcing structure) used to reinforce an existing sheet pile quay, a reinforcing structure in which the L-shaped reinforcing structure is installed, and a reinforcing method.

  A sheet pile quay, which is a typical form of a quay, forms a sheet pile wall that receives earth pressure and water pressure by driving a sheet pile (steel sheet pile, steel pipe sheet pile, etc.) 11 into the bottom bottom ground 1 as shown in FIG. A quay 10 having a structure in which a sheet pile wall and a retaining pile (not shown) are coupled by a tie material (for example, a tie rod) 14. In FIG. 7, 2 is a water bottom, 3 is a water surface, 4 is a ground on the quay side, 12 is a superstructure (coping), 13 is a fender, 15 is an apron, and 20 is a quay normal.

  It is feared that such sheet pile quays will be damaged by earthquakes and heavy rains, etc., when they are aged or built according to old design standards. Reinforcing work is urgently needed to prevent this.

  Conventionally, as a method for reinforcing a sheet pile quay, partial reinforcement of a sheet pile (welding reinforcement using a steel plate backing plate or underwater reinforcement using reinforced concrete) has been performed.

  Patent Document 1 discloses a reinforcing method in which a new quay is constructed in front of an existing sheet pile quay.

JP 2005-139680 A

  However, the partial reinforcement of the sheet pile as described above (welding reinforcement with a steel plate backing plate or underwater reinforcement with reinforced concrete) is merely a repair of the sheet pile itself, and is not a structural reinforcement of the sheet pile quay. It is not enough reinforcement against heavy rain.

  Moreover, the reinforcement method of constructing a new quay on the front side of the existing sheet pile quay as described in Patent Document 1 is a large-scale reinforcement work, and there is a problem that a great amount of cost is required.

  The present invention has been made in view of the circumstances as described above, and a reinforcing structure capable of accurately and economically reinforcing an existing sheet pile quay wall. A reinforcing structure and a reinforcing method provided with the L-shaped reinforcing structure. Is intended to provide.

  In order to solve the above problems, the present invention has the following features.

[1] A reinforcing structure that is installed when reinforcing a sheet pile quay formed by driving a sheet pile into the bottom of the ground to form a sheet pile wall, and in the installed state, the vertical section has an L-shaped part, A pile in which a vertical portion forming one side of the L-shaped cross section is connected and integrated with the sheet pile, and a horizontal portion forming the other side of the L-shaped cross section is driven into a position away from the sheet pile quay by a predetermined distance. An L-shaped reinforcing structure characterized in that it is connected to an L-shaped reinforcing structure.

[2] The L-shaped reinforcing structure according to [1], wherein the L-shaped reinforcing structure has an L-shaped vertical cross section.

[3] In the L-shaped reinforcing structure, the thickness of the vertical portion is set to a thickness that does not change the quay normal in relation to the installed sheet pile quay [1] or [2 ] L-shaped reinforcement structure of description.

[4] The L-shaped reinforcing structure according to any one of [1] to [3], wherein a thickness of the vertical portion changes in a height direction.

[5] The L-shaped reinforcing structure according to any one of [1] to [4], which is any one of a steel-concrete composite structure, a reinforced concrete structure, a steel structure, or a composite structure thereof.

[6] A reinforcement structure for an existing sheet pile quay, wherein the L-shaped reinforcement structure according to any one of [1] to [5] is installed on an existing sheet pile quay.

[7] The L-shaped reinforcing structure is installed such that the upper end of the vertical portion of the L-shaped reinforcing structure is located in a range of 1/5 to 3/5 of the height from the bottom of the sheet pile. The reinforcing structure of the existing sheet pile quay as described in [6].

[8] The reinforcing structure for an existing sheet pile quay according to [6] or [7], wherein the L-shaped reinforcement structure is installed so as not to change a quay normal.

[9] A reinforcing method for reinforcing an existing sheet pile quay using the L-shaped reinforcing structure according to any one of [1] to [5],
A step of excavating the seabed ahead of the quay in an existing sheet pile quay, a step of placing a pile at the excavated portion, a step of connecting the placed pile and the horizontal portion, and connecting and integrating the vertical portion with the sheet pile A method for reinforcing a sheet pile quay characterized by comprising:

  In the present invention, the sheet pile itself is reinforced by connecting and integrating the vertical portion of the L-shaped reinforcing structure with the sheet pile, and the integrated sheet pile and the vertical portion are driven to face the sheet pile. Structural reinforcement that a pile supports via the horizontal part of an L-shaped reinforcement structure can be performed. Moreover, it can be carried out at a lower cost than the large-scale reinforcement method of constructing a new quay on the front side of the existing sheet pile quay as described in Patent Document 1.

  Therefore, by applying the present invention, the existing sheet pile quay can be accurately and economically reinforced.

It is a perspective view which shows one Embodiment of this invention. It is a vertical sectional view showing one embodiment of the present invention. It is AA arrow sectional drawing of FIG. It is the figure which compared the stress etc. which arise in a steel pipe sheet pile with the case where it is the existing sheet pile quay, and the case where the existing sheet pile quay is reinforced based on one embodiment of the present invention. It is a vertical sectional view showing other embodiments of the present invention. It is a vertical sectional view showing other embodiments of the present invention. It is a vertical sectional view showing an existing sheet pile quay. It is explanatory drawing of the construction method of the L-shaped reinforcement structure which concerns on Embodiment 2 of this invention. It is explanatory drawing of the construction method of the L-shaped reinforcement structure which concerns on Embodiment 2 of this invention.

  An embodiment of the present invention will be described with reference to the drawings.

[Embodiment 1]
FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a vertical sectional view showing an embodiment of the present invention, and FIG. 3 is a sectional view taken along arrow AA in FIG.

  First, as shown in FIGS. 1 and 2, the sheet pile quay targeted in this embodiment has the same structure as the sheet pile quay 10 shown in FIG. 7. That is, a sheet pile (here, a steel pipe sheet pile) 11 is driven into the bottom ground 1 to form a sheet pile wall that receives earth pressure and water pressure, and the sheet pile wall (steel pipe sheet pile) 11 and a retaining pile (not shown) are connected to a tie rod 14. It is a structure joined by. In FIGS. 1 and 2, 2 is a water bottom, 3 is a water surface, 4 is a ground on the quay side, 12 is a superstructure (coping), 13 is a fender, 15 is an apron, and 20 is a quay normal.

  In addition, in this embodiment, as shown in FIGS. 1 and 2, a plurality of piles 21 are arranged in a row so as to face the steel pipe sheet pile 11 at a predetermined distance from the sheet pile quay 10 (here, two rows). ), And a reinforcing structure 30 having an L-shaped vertical cross section (L-shaped reinforcing structure) 30 is installed between the pile 21 and the steel pipe sheet pile 11.

  Here, the upper end of the pile 21 is located near the bottom of the bottom 2, and the horizontal portion 31 that forms one side of the L-shaped reinforcing structure 30 is located directly below the bottom 2 and is connected to the upper end of the pile 21. At the same time, the vertical part 32 forming the other side of the L-shaped reinforcing structure 30 is located inside the quay normal 20 (between the quay normal 20 and the steel pipe sheet pile 11), and is connected to and integrated with the steel pipe sheet pile 11. ing. In addition, the upper end of the vertical part 32 is located in the middle from the water bottom 2 to the tie rod 14, and the details will be described later, but in the range of 1/5 to 3/5 of the height of the steel pipe sheet pile 11 from the water bottom 2. Preferably it is located.

Then, as shown in FIG. 3, the vertical portion 32 of the L-shaped reinforcing structure 30 is provided with a detent 37 and a submerged concrete 36 filled in the steel pipe sheet pile 11 and a reinforcing steel plate 35 that also serves as a formwork. It has an integrated steel-concrete composite structure. As the stopper 37, a stud 37a as shown in FIG. 3A, a reinforcing bar 37b as shown in FIG. 3B, a shape steel 37c as shown in FIG.
Moreover, the horizontal part 31 of the L-shaped reinforcement structure 30 also has the same steel concrete composite structure. In addition, in FIG. 1, in order to clarify the internal structure of the horizontal part 31, description of the concrete laid in the horizontal part is abbreviate | omitted.

  As described above, in this embodiment, the vertical portion 32 of the L-shaped reinforcing structure 30 is connected to and integrated with the steel pipe sheet pile 11 so that the steel pipe sheet pile 11 itself is reinforced and integrated. The steel pipe sheet pile 11 and the vertical part 32 are structurally reinforced such that the piles 21 driven in a row so as to face the steel pipe sheet pile 11 are supported via the horizontal part 31.

  In other words, the sheet pile quay 10 is integrally reinforced by a structure constructed by the pile 21 and the L-shaped reinforcing structure 30.

  FIG. 4 shows a design model, a bending moment acting on the steel pipe sheet pile 11 in the case where the existing sheet pile quay 10 shown in FIG. 7 is left as it is and the case where the existing sheet pile quay 10 is reinforced based on this embodiment. It compares about the stress which generate | occur | produces in the steel pipe sheet pile 11, and the reaction force which acts on the tie rod 14. FIG. In addition, 16 in a figure is a reserve pile.

  First, in the case of the existing sheet pile quay 10 shown in FIG. 4A, the design model is a simple beam model in which the steel pipe sheet pile 11 is supported by the tie rod 14 and the water bottom ground surface 2.

  And about bending moment distribution which acts on the steel pipe sheet pile 11 by earth pressure, water pressure, etc., the largest bending moment M1 generate | occur | produces in the middle vicinity of the steel pipe sheet pile 11. FIG.

  In the stress distribution generated in the steel pipe sheet pile 11 by the bending moment, the maximum stress σb1 is generated near the middle.

  A reaction force (tensile force) R1 acts on the tie rod.

  On the other hand, when the existing sheet pile quay 10 is reinforced based on this embodiment shown in FIG. 4 (b), the steel pipe sheet pile 11 and the design model are added by adding the L-shaped reinforcement structure 30. The L-shaped reinforcing structure 30 is modeled as a beam that is supported by a linear spring at the tie rod 14 part and supported by a rotary spring at the water bottom part 2. Further, the lower part of the beam (the part in which the steel pipe sheet pile 11 is integrated with the vertical part 32 of the L-shaped reinforcing structure 30) increases the bending rigidity due to the effect of integrating the vertical part 32 of the L-shaped reinforcing structure 30. .

  As for the bending moment distribution acting on the steel pipe sheet pile 11 due to earth pressure, water pressure, etc., the maximum bending moment M2 occurs near the middle of the steel pipe sheet pile 11, but the bending rigidity of the lower part of the steel pipe sheet pile 11 (lower part of the beam) is Since it increases and the reinforcement structure bears bending, it greatly reduces compared with the maximum bending moment M1 of the steel pipe sheet pile 11 before reinforcement.

  Regarding the stress distribution generated in the steel pipe sheet pile 11 by the bending moment, the maximum stress σb2 is generated near the middle, but the acting bending moment is reduced and the steel pipe integrated with the vertical portion 32 of the L-shaped reinforcing structure 30. Since the cross-sectional performance of the sheet pile 11 is improved, it is significantly reduced compared to the maximum stress σb1 of the steel pipe sheet pile 11 before reinforcement.

  Also, with respect to the reaction force (tensile force) R2 acting on the tie rod, since the rigidity of the lower part of the steel pipe sheet pile 11 (lower part of the beam) is increased, the generated force is guided downward and is arranged on the upper part of the steel pipe sheet pile 11. The reaction force of the tie rod 14 is reduced, and the tie rod reaction force R1 before reinforcement is greatly reduced.

That is,
Maximum bending moment acting on steel pipe sheet pile 11: M2 << M1
Maximum stress generated in the steel pipe sheet pile 11: σb2 << σb1
Reaction force acting on the tie rod 14: R2 << R1
It becomes.

  Table 1 shows the influence of the position of the upper end of the vertical portion 32 on the reaction force acting on the tie rod 14 (tie rod reaction force) and the bending stress degree acting on the steel pipe sheet pile 11 (the bending stress degree of the sheet pile). Here, the height position of the upper end of the steel pipe sheet pile 11 from the bottom 2 is 5/5 (= 1.0), and the position of the upper end of the vertical portion 32 is 1/5 (= 0.2), 2/5 (= 0). .4) 3/5 (= 0.6), 4/5 (= 0.8), and 5/5 (= 1.0), the tie rod reaction force and the bending stress degree of the sheet pile at that time The case where the existing sheet pile quay 10 remains as it is (when there is no reinforcement) is shown as 100 respectively.

  From the results shown in Table 1, the tie rod reaction force is 80% or less compared to the case without reinforcement when the upper end position of the vertical portion is in the range of 1/5 to 3/5 of the height from the bottom of the water to the upper end of the steel sheet pile. Therefore, there is a reduction effect of 20% or more. In addition, regarding the bending stress degree of the sheet pile, when the vertical part upper end position is 3/5 of the height from the water bottom to the upper end of the steel pipe sheet pile, the reduction is less than in other cases, but still compared with the case without reinforcement. 70% or less, and there is a reduction effect of 30% or more. Therefore, as described above, it is preferable that the upper end of the vertical portion 32 is positioned in the range of 1/5 to 3/5 of the height from the bottom 2 of the steel pipe sheet pile 11.

  Thus, in this embodiment, the maximum bending moment acting on the steel pipe sheet pile 11, the maximum stress generated in the steel pipe sheet pile 11, and the reaction force acting on the tie rod can be greatly reduced. Moreover, the horizontal part 31 of the L-shaped reinforcement structure 30 arrange | positioned just under the water bottom 2 reinforces the ground of the front surface of the steel pipe sheet pile 11 with the pile 21, and increases a passive resistance. Thereby, the existing sheet pile quay 10 can be reinforce | strengthened accurately with respect to an earthquake, concentrated heavy rain, etc.

  In this embodiment, the horizontal portion 31 of the L-shaped reinforcing structure 30 is located immediately below the bottom 2, and the vertical portion 32 of the L-shaped reinforcing structure 30 is located inside the existing quay normal 20. Therefore, the quay normal 20 remains unchanged, and there is no hindrance to the mooring of the ship. And since it is not necessary to modify the sheet pile quay 10 itself, it becomes possible to continue using the facilities of the sheet pile quay 10 even after reinforcement work.

  Furthermore, since the sheet pile quay wall 10 is integrally reinforced by the pile 21 and the L-shaped reinforcement structure 30, a new quay wall is constructed in front of the existing sheet pile quay wall as described in Patent Document 1. Compared with a large-scale reinforcement method, it can be carried out at a low cost. In addition, the vertical portion 32 of the L-shaped reinforcing structure 30 has a steel-concrete composite cross-section in which a new reinforcing steel plate 34 and an existing steel pipe sheet pile 11 are integrated with concrete 36, and the existing structure is partially utilized for economy. Is.

  Therefore, by applying this embodiment, it is possible to reinforce the existing sheet pile quay 10 accurately and economically.

  It should be noted that the dimensions and structure of the horizontal portion 31 and the vertical portion 32 of the L-shaped reinforcing structure 30 and the cross-sectional shape / size, driving depth, driving pitch, etc. of the pile 21 are appropriately determined according to the external force during an earthquake or the like. do it.

  For example, in the above embodiment, the horizontal portion 31 and the vertical portion 32 of the L-shaped reinforcing structure 30 have a steel concrete composite structure, but may be a reinforced concrete structure or a steel structure. Further, for example, a composite structure in which the vertical portion 32 and the horizontal portion 31 are different from each other may be used so that the vertical portion 32 has a reinforced concrete structure and the horizontal portion 31 has a steel concrete composite structure.

  Moreover, about the vertical part 32 of the L-shaped reinforcement structure 30, in the said embodiment, although the upper end of the vertical part 32 was located in the middle from the water bottom 2 to the tie rod 14, depending on the case, it shows in FIG. As described above, the upper end of the vertical portion 32 may be extended to the lower surface of the upper work 12. Further, the thickness of the vertical portion 32 may be changed in the height direction. For example, as shown in FIG. 5, the thickness of the upper portion (here, near the water surface 3) of the vertical portion 32 may be made thinner than the thickness of the lower portion.

  In the above embodiment, the upper end position of the pile 21 is set near the bottom of the bottom 2 so that the ship 40 using the sheet pile quay 10 is not restricted by draft, and the upper end of the pile 21 is L-shaped. Although the horizontal part 31 of the structure 30 is connected, when the draft of the ship 40 using the sheet pile quay 10 is relatively small, the pile 21 is driven until the upper end position of the pile 21 is below the bottom 2. It is not necessary, and according to the draft of the ship 40, the upper end position of the pile 21 may be an appropriate position from the water surface 3 to near the bottom of the bottom 2 and the horizontal portion 31 of the L-shaped reinforcing structure 30 What is necessary is just to make a height position (connection position of the horizontal part 31 and the pile 21) into the appropriate position below the upper end position of the pile 21. FIG.

  For example, as shown in FIG. 6, the upper end of the pile 21 may be positioned above the water bottom 2 by a predetermined height, and the horizontal portion 31 of the L-shaped reinforcing structure 30 may be connected to the upper end of the pile 21. .

  Further, when the quay normal line may be moved to the sea side, the upper end of the vertical portion 32 of the L-shaped reinforcing structure 30 may be extended to the upper surface of the upper work 12 as shown in FIG.

  And this invention can be similarly applied not only to a sheet pile quay but also to a sheet pile revetment (a revetment using a sheet pile).

  In the above description of the embodiment, the L-shaped reinforcing structure 30 has an L-shaped vertical cross section, but the shape of the L-shaped reinforcing structure 30 of the present invention is limited to this. The vertical section only needs to have an L-shaped portion. For example, the horizontal portion 31 extends in the horizontal direction from the vertical portion 32, or the vertical portion 32 extends in the vertical direction from the horizontal portion 31. For example, the entire shape of the vertical cross section may be a substantially cross shape or a T shape.

[Embodiment 2]
Based on FIG. 8, FIG. 9, the construction method of the L-shaped reinforcement structure which is Embodiment 2 of this invention is demonstrated. 8 and 9, the same parts as those in FIGS. 1 to 6 are denoted by the same reference numerals.

  The seabed 2 on the front side of the sheet pile 11 in the existing sheet pile quay to be reinforced (see FIG. 8A) is excavated by a predetermined width and depth (see FIG. 8B). The predetermined width and depth are the width and depth at which the horizontal portion 31 (see FIG. 2) of the L-shaped reinforcing structure 30 to be installed can be installed. By excavating to a predetermined depth, the position of the seabed 2 is not changed to the position before the L-shaped reinforcing structure 30 is installed, so that the navigation of the ship is not hindered.

  Next, piles 21 (straight piles and diagonal piles) are placed in the excavated location (see FIG. 8C). Next, a steel structure 30a that is a framework of the L-shaped reinforcing structure 30 is installed. The steel structure 30a includes, for example, the reinforcing steel plate 35 (see FIG. 3) joined with the stopper 37 in the vertical portion as described in the first embodiment, and in the horizontal portion in FIG. As shown, it is assumed that the H-shaped steel is installed in the longitudinal direction of the quay with a predetermined interval, and the H-shaped steel is installed in the sheet pile 11 in the orthogonal direction for each pile 21. Since the steel pipe-shaped (or square-shaped) member that can be covered later is attached to the pile 21 that has been cast, the H-section steel is covered with the pile 21 that has been cast. The steel structure 30a can be installed on the pile 21 (see FIG. 9D and FIG. 1).

  When the installation of the steel structure 30a is completed, the necessary formwork is installed and the underwater concrete 36 is placed in the vertical and horizontal parts (see FIG. 9 (e)). When the underwater concrete 36 is solidified, the mold is removed to complete (see FIG. 9F).

In the construction method of the L-shaped reinforcement structure described above, the procedures of excavation of the seabed 2, placement of the pile 21, installation of the steel structure 30 a, and placement of the underwater concrete 36 have been described. However, the construction procedure is not limited to the following.
Excavation of the seabed 2, placing some of the piles 21, placing a steel structure 30 a, placing the remaining piles 21, placing underwater concrete 36.
As another construction procedure, excavation of the seabed 2, installation of a steel structure 30 a, placement of piles 21, placement of underwater concrete 36.

1 Water bottom ground 2 Water bottom 3 Water surface 4 Quay side 10 Sheet pile quay 11 Sheet pile (steel sheet pile, steel pipe sheet pile)
12 Superstructure 13 Fender 14 Tie rod 15 Apron 16 Reserve pile 20 Quay normal 21 Pile 30 L-shaped reinforcing structure 30a Steel structure 31 Horizontal portion of L-shaped reinforcing structure 32 Vertical portion of L-shaped reinforcing structure 35 Reinforcement Steel plate (formwork)
36 Underwater concrete 37 Detachment 37a Stud 37b Reinforcement 37c Shape steel 40 Ship

Claims (8)

It is a reinforcing structure of an existing sheet pile quay that is formed by connecting a pile pile with a tie rod and a pile pile formed by driving a sheet pile into the bottom of the water,
An L-shaped reinforcing structure having a L-shaped vertical section and a pile driven at a predetermined distance from the sheet pile quay,
A vertical portion forming one side of the L-shaped cross section in the L-shaped reinforcing structure is connected to and integrated with the sheet pile, and a horizontal portion forming the other side of the L-shaped cross section is connected to the pile. Strengthening structure of existing sheet pile quay . The reinforcing structure for an existing sheet pile quay according to claim 1, wherein the L-shaped reinforcing structure has an L-shaped vertical section. 3. The existing L-type reinforcing structure according to claim 1, wherein a thickness of the vertical portion is set to a thickness that does not change a quay normal in relation to an installed sheet pile quay. Reinforcement structure of sheet pile quay . The thickness of the said perpendicular | vertical part is changing in the height direction, The reinforcement structure of the existing sheet pile quay wall as described in any one of Claims 1-3 characterized by the above-mentioned. The reinforcing structure for an existing sheet pile quay according to any one of claims 1 to 4, which is a composite structure of steel concrete, a reinforced concrete structure, a steel structure, or a composite structure thereof.   The L-shaped reinforcing structure is installed so that the upper end of the vertical portion of the L-shaped reinforcing structure is located in a range of 1/5 to 3/5 of the height from the bottom of the sheet pile. The reinforcement structure of the existing sheet pile quay wall as described in any one of Claims 1-5.   The reinforcing structure for an existing sheet pile quay according to any one of claims 1 to 6, wherein the L-shaped reinforcing structure is installed so as not to change a quay normal. It is a reinforcing structure that is installed when reinforcing a sheet pile quay formed by driving a sheet pile into the bottom of the ground to form a sheet pile wall, and in the installed state, the vertical section has an L-shaped part, and its L-shape A vertical part forming one side of the cross section is connected and integrated with the sheet pile, and a horizontal part forming the other side of the L-shaped cross section is connected to a pile driven at a predetermined distance from the sheet pile quay. A reinforcing method for reinforcing an existing sheet pile quay using an L-shaped reinforcing structure,
The step of excavating the seabed in front of the quay in the existing sheet pile quay, the step of driving a pile at the excavated location, and connecting the placed pile and the horizontal portion of the L-shaped reinforcing structure and the L-shaped reinforcing structure A method for reinforcing an existing sheet pile quay comprising the step of connecting and integrating a vertical portion of an object with the sheet pile.

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