JP6467667B2 - Construction method of quay structure - Google Patents

Description

  The present invention relates to a method for constructing a quay structure, mainly a harbor structure such as a quay or a revetment, which has a structure including a wall body such as a sheet pile wall installed in water and a back portion on the back side thereof. .

  Quay structures such as quays and revetments are equipped with a wall made of steel sheet piles, etc. on the front, and earthed by the bending rigidity of the wall and the ground resistance at the base or bottom of the wall. There is known a structure in which a part or a back ground is integrated to resist external forces such as waves and tidal currents.

  Conventionally, in this type of quay structure, the wall body such as a sheet pile wall is supported by a laying member installed on the ground on the back side of the wall body through a tie material such as a tie rod or a tie wire, and the wall body and the back side ground. Integrated strength improvement was achieved.

  However, in the structure in which the wall body such as the sheet pile wall is supported by the construction work, it is difficult to maintain the load balance of the sheet pile body and the construction work, the structure is complicated, the construction period is prolonged, and the construction cost is increased. Since it is difficult to secure the installation site width, there is a problem that the installation work is complicated and the construction period is prolonged.

  Therefore, in recent years, by applying the reinforced earth method, which has a proven track record as a seismic construction method for land structures, to quay structures such as quay and revetment, the tie materials such as piers and tie rods are omitted, and walls such as sheet pile walls are used. Development of a technique for improving the strength of the body and the backfill portion integrally has also been sought (for example, see Patent Document 1).

  A quay structure using this reinforced earth method has a back-filled portion made of solidified soil on the back side of a wall body such as a sheet pile wall, and one end is connected to the wall body for each desired height of the back-walled portion. Reinforced laying members such as geogrids are laid in the raised state, increasing the shear strength at the backside to reduce the earth pressure acting on the wall, and supporting the wall to the backside via the reinforcing laying member Thus, the integral strength improvement between the wall body and the back-in part is achieved.

  In the construction of such a quay structure, each reinforcing laying member is installed by depositing the solidified soil to a desired height, leveling the upper surface, and then rolling it into a roll and reinforcing the laying member such as a geogrid. Was submerged to the installation location in the water, and one end of the reinforcing laying member was connected to the wall body by a diver and was deployed toward the rear side in the horizontal direction of the wall body.

  In addition, as a method for efficiently sinking and connecting a reinforcing laying member such as a geogrid to a wall body, a guide member made of channel steel or the like is provided in advance on a wall body structural member such as a steel pipe sheet pile constituting the wall body. In addition, a method has been developed in which one end is attached to a rod-shaped connecting member and a reinforcing laying member such as a geogrid wound in a roll shape is slid while sliding both ends of the connecting member supported by guide members. ing.

JP 2007-056663 A

  However, in the conventional technology as described above, it is necessary for a diver to manually deploy a reinforcing laying member such as a geogrid in the water, which is dangerous to the work, and the work is complicated and there is a concern that the construction period may be prolonged. Is done.

  In addition, in the case where a reinforcing laying member such as a geogrid is supported by a guide member installed on a wall body component member to sink, the placement accuracy of the wall body member member such as a steel sheet pile greatly affects the sheet pile. When the walls are irregularly placed, the distance between the guide members is not constant, and the connecting member around which the one end of the reinforcing laying member is wound may come off between the guide members and become unslidable.

  Therefore, in view of such a conventional problem, the present invention has been made for the purpose of providing a construction method of a quay structure such as a quay or a revetment that can reduce the work in water and can be easily and inexpensively constructed. is there.

The feature of the invention according to claim 1 for solving the conventional problems as described above is that a wall body installed on the front surface and a back portion formed by depositing a back material on the back side of the wall body, In the construction method of a quay structure comprising a flexible mesh-like or lattice-like reinforcing laying member laid at every desired height of the back portion, the turning radius is supported by a deployment member One end of each of the reinforcing laying members in a state expanded in a direction and a direction crossing the direction is supported by a wall member constituting the wall body at every desired height so as to be rotatable, and the distal end side in the rotation radial direction In the state where the wall member is raised, the rotating tip portion of each reinforcing laying member is temporarily fixed to the wall member so as to be detachable, and the wall member is installed in this state and the wall body is installed. After that, a step of putting the backing material to a desired height on the back side of the wall body, and the auxiliary Steps of releasing the temporary fixing of the strong laying member, tilting the reinforced laying member in the deployed state toward the backing portion side, and laying the reinforcing laying member on the upper surface of the inserted backing material in order from the lower side It is in the construction method of repeated quay structures.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect, the deployment member is formed in a frame shape arranged along an outer edge of the reinforcing laying material.

The construction method of a quay structure according to the present invention includes, as described above, a wall body installed on the front surface, a back portion formed by depositing a back material on the back side of the wall body, and the back portion. In a construction method of a quay structure having a flexible mesh-like or lattice-like reinforcing laying member laid at every desired height, the radiating member is supported by a deploying member and intersects with the turning radial direction. One end of each of the reinforcing laying members in a state of being expanded in the direction is rotatably supported by a wall member constituting the wall body at every desired height, and the distal end side in the rotational radial direction is the wall member. The rotating tip of each reinforcing laying member is detachably temporarily fixed to the wall member while being raised to the side, and the wall member is installed in that state to construct the wall body. Then, the step of throwing the backing material to the desired height on the back side of the wall body, and the reinforcement laying member Unpinned, by sequentially repeating the step of laying the upper surface reinforcement laying member of the thrown-in Urakomi material is tilted the reinforcing laying member a developed state in Urakomi side from the lower side, dive It is possible to greatly reduce underwater work by a technician, and to lay a reinforcing laying member such as a geogrid at every desired height of the backing portion safely and efficiently.

  Further, in the present invention, the deployment member is formed in a frame shape arranged along the outer edge of the reinforcement laying material, so that the reinforcement laying member can be turned at a radius of rotation without impairing the function of the reinforcement laying member. The state developed in the direction and the wall width direction can be suitably maintained.

It is a longitudinal section showing an example of a quay structure concerning the present invention. It is a partial enlarged plan view which shows the outline of the connection part of the wall body and reinforcement laying member in FIG. It is a partial expanded sectional view which shows a connection part with a wall body same as the above. It is sectional drawing which shows the outline of the wall body installation process of the construction method of the quay structure which concerns on this invention. It is sectional drawing which shows the outline of the process of laying the first reinforcement | laying laying member in back lining part construction same as the above. It is sectional drawing which shows the outline of the process of laying the 2nd step | paragraph reinforcement | strengthening laying member in the back part construction. It is sectional drawing which shows the outline of the process of laying the 3rd step | paragraph reinforcement | strengthening laying member in the back part construction. It is sectional drawing which shows the state which completed the construction of the back part.

  Next, the construction method of the quay structure according to the present invention will be described based on the embodiment shown in FIGS.

  FIG. 1 shows a quay structure such as a sheet pile type quay constructed by the method of the present invention. In the figure, reference numeral 10 denotes a water bottom ground, reference numeral 11 denotes a water surface, and reference numeral 12 denotes a quay structure.

  This quay structure 12 covers the wall 13 installed in the front part, the back part 15 which piled the back stones 14,14 ... on the back side of the wall 13, and the back part 15 And a landfill part 17 buried in the landfill.

  Further, the quay structure 12 includes a plurality of reinforcing laying members 16, 16... That are laid at every desired height of the back portion 15 with one end fixed to the wall body 13. The shear strength of the portion 15 is increased to reduce the earth pressure acting on the wall body 13, and the wall body 13 is supported by the backing portion 15 via the reinforcing laying members 16, 16. Integrated strength improvement with the back-in part 15 is achieved.

  As shown in FIG. 2, the wall body 13 is composed of a plurality of wall members 30, 30..., And each wall member 30, 30 is placed on the underwater ground 10 in a state where the side edges are connected to each other. As a result, the offshore side and the land side are separated.

  The wall member 30 is unitized by connecting a plurality of steel sheet piles 31 and 31 to each other at the side edges thereof. The wall body is constructed by driving the bottom 10 to the bottom.

  In addition, the member 30 for walls is not limited to what consists of the above-mentioned general U-shaped steel sheet pile, For example, it may consist of a steel pipe sheet pile, and may consist of concrete sheet piles, such as a PC sheet pile. Good.

  Further, a plurality of reinforcing laying members 16, 16... Are rotatably supported on each wall member 30 via a rotation support means 32 for each desired height.

  The rotation support means 32 includes a bellows member 33 made of channel steel fixed to the front side of the wall member 30, and a PC having one end fixed to the bellows member 33 or the sheet pile 31 and protruding toward the back side. Support members 34 and 34 made of steel bars and the like, and a turning shaft member 35 made of a steel pipe having a shaft laid in the wall width direction on the supporting member 34, and the turning shaft member 35 is reinforced with a geogrid or the like. By connecting one end of the laying member 16 in a wound state, the reinforcing laying member 16 is rotatably supported by each wall member 30.

  In addition, when fixing one end of the supporting members 34 and 34 to the steel sheet pile 31, as shown in FIG. 2, the auxiliary member 38, such as H steel orient | assigned to the up-down direction between the sheet pile 31 and the belly raising material 33, is shown. It is preferable that the sheet pile 31 is supported by the erection material 33 via the auxiliary member 38 and the strength of the sheet pile 31 is secured.

  The reinforcing laying member 16 is made of a material such as a geogrid, which has flexibility and corrosion resistance and has high tensile strength, and has a large number of cross members 36 and 36 arranged in parallel with each other. The cross members 36, 36 are formed in a lattice sheet integrally provided with a plurality of vertical members 37, 37...

  Each reinforcement laying member 16 is formed to have a lateral width (short side length) substantially the same as the width of the wall member 30, and the reinforcing portion installation members 16, 16 of the wall member 30 placed adjacent to each other are mutually connected. Each of them can be rotated independently without interference.

  Further, a frame-shaped deployment member 40 made of a material having high rigidity, for example, a high-strength plastic material, is fixed to the outer edge portion of the reinforcement laying member 16, and is supported by the deployment member 40 so as to rotate in the rotational radial direction and It is maintained in a state where it is expanded in a direction perpendicular thereto.

  The unfolding member 40 has a pair of vertical frame portions 40a and 40a fixed to the side edge portions of the reinforcing laying member 16 in the rotational radial direction, and between the rotational leading end side ends of the vertical frame portions 40a and 40a. A horizontal frame portion 40b fixed to the edge on the front end side so as to be bridged between the two vertical frame portions 40a, 40a and the horizontal frame portion 40b.

  In addition, the expansion | deployment member 40 is not limited to the above-mentioned aspect, What is necessary is just the shape which can maintain the reinforcement laying member 16 in the state expand | deployed in the rotation radial direction and the direction orthogonal to it, for example, both the vertical frame parts 40a , 40a may have a rectangular frame shape with a lateral frame portion 40b on the proximal end side, or may have a shape other than the frame shape.

  Further, the material of the deployment member 40 is not limited to the above-described high-strength plastic material as long as it has a certain rigidity. For example, the deployment member 40 may be made of a metal such as a steel material, and may be formed horizontally with the vertical frame portion 40a. The material may be changed between the frame portion 40b, the vertical frame portion 40a may be made of a high-strength plastic material, and the horizontal frame portion 40b on the distal end side in the rotation direction may be made of a steel material heavier than the high-strength plastic material.

  On the other hand, each wall member 30 is provided with a temporarily fixing hook 41 at the upper end thereof on the back side, and the turning radius of the reinforcing laying member 16 is temporarily attached to the temporarily fixing hook 41 via the temporarily fixing member 42. The direction tip side can be temporarily fixed so as to be detachable.

  The temporary fixing member 42 is constituted by a wire or the like having one end connected to the reinforcing laying member 16, and the other end of the temporary fixing member 42 made of the wire is locked to the temporary fixing hook 41. .

  The backing portion 15 is constructed by depositing backing materials 14, 14... On the back side of the wall body 13. In addition, the code | symbol 21 in a figure is the water-impervious sheet | seat which covers over the upper surface and back side slope of a back part.

  For the backing material 14, for example, a cracked stone having a particle size of 50 to 150 mm and an average particle size of 100 mm is used. In that case, the backing material 14 constituting the backing portion 15 at a desired height portion, 14 and the reinforcing laying members 16, 16... And between the upper and lower padding layers 23 formed by laying padding materials 22, 22. 24, and the reinforcing laying members 16, 16 ... may be sandwiched between the upper and lower padding layers 23, 24.

  The backing material 14 is not limited to the above-mentioned cracked stone, and for example, a solidified soil obtained by stirring and mixing a solidified material with clay may be used.

  Next, a specific method for constructing the quayside structure 12 will be described.

  First, as a preliminary preparation, a wall member 30 is formed by combining a plurality of steel sheet piles 31, 31 in an onshore work yard or the like, and a rotation support means 32 is provided for each desired height position of each wall member 30. At the same time, the reinforcing laying members 16, 16... Supported by the deployment member 40 via the rotation support means 32 are rotatably attached.

  Then, the reinforcing laying members 16, 16... Are rotated toward the wall member side, and the distal end side in the rotation radial direction is raised toward the wall member side, and temporarily fixed to the temporary fixing hook 41 in this state. .. Are temporarily fixed to the wall member 30 so that they can be detached.

  Accordingly, each wall member 30 holds a plurality of reinforcing laying members 16, 16... Overlapping with each other along the back surface of the wall member 30.

  Next, the wall members 30, 30 are placed on the water bottom ground 10 with a desired depth of insertion while matching the heights of the rotation support means 32, 32 with each other, and the wall body 13 is placed on the underwater front portion. To construct.

  At that time, since the distal end portion in the rotational radius direction of each reinforcing laying member 16 supported by the deployment member 40 is temporarily fixed to the wall member 30 so as to be detached, as shown in FIG. The reinforcing laying members 16, 16... Deployed in the wall width direction are supported in a state where they are raised on the wall body side.

  Next, using a gut ship, a grab ship or the like (not shown), the backing materials 14, 14... Made of a large grain particle (average particle size 100 mm) are put on the back side of the wall body 13. The backing materials 14, 14 ... are deposited to a desired height (backing material charging step).

  At that time, the backing materials 14, 14... Are introduced with the position of the rotation support means 32 as a guide, and after the backing materials 14, 14. Flatten the top surface of ... by a diver. In addition, when using a stone material having a large particle size such as cracked stone for the backing materials 14, 14 ..., the particle size of the backing material 14, 14 ... is smaller than that of the cracked stones. It is possible to further flatten the gaps 22, 22... Made of crushed stone or the like and level the gaps 22, 22.

  Next, as shown in FIG. 5, the temporary fixing of the reinforcing laying member 16 supported by the lowermost rotation support means 32 is released, that is, the temporary fixing member 42 of the reinforcing laying member 16 is temporarily fixed to the hook. The reinforcement laying member 16 is laid on the upper surface of the backing materials 14, 14... (Filling materials 22, 22. (Reinforcement laying member laying step).

  At that time, the reinforcing laying member 16 is bent because the outer edge thereof is supported by the developing member 40 and is deployed in the rotational radial direction and the wall width direction, and is in a lattice shape and hardly receives water resistance. It is laid without being tilted and properly deployed on the upper surface of the transverse cross section of the back portion 15.

  Further, the reinforcing laying members 16 and 16 supported by the wall members 30 and 30 adjacent to each other are in an independent state, and each is deployed in the turning radius direction and the wall width direction by the deployment member 40. Since they are in a state, they are tilted without interfering with each other, and each of them is laid in a parallel arrangement in plan view without overlapping the upper surface of the transverse section of the backing portion 15.

  Next, as shown in FIG. 6, on the reinforcing laying member 16 laid using a gut ship, a grab ship or the like (not shown), the interstices 22, 22... Backing materials 14, 14... Made of cracked stone (average particle size 100 mm) are charged to a desired height (backing material charging step).

  Thereafter, as shown in FIGS. 6 to 8, the backing portion 15 is constructed by repeating the backing material charging step and the reinforcing laying member laying step for each desired height from the lower side.

  And if construction of the back part 15 is completed, after installing the water-impervious sheet 21 on the upper surface and back side slope of the back part 15, it is buried so as to cover the back part 15. Moreover, the work is completed by pavement or the like of the superstructure 25 of the wall 13 or the upper surface of the structure as necessary.

  In the construction method of the quay structure constructed as described above, the work of connecting the reinforcing laying member 16 such as a geogrid underwater by the diver to the wall body 13 and the work of expanding the work are not required, and the work is performed safely and efficiently. The construction period can be shortened.

  Moreover, in this quay wall structure 12, since one end of each reinforcement laying material is connected to the wall body 13 via the rotation support means 32, the wall body 13 is connected via the reinforcement laying members 16, 16 ... The integral strength of the wall 13 and the back portion 15 is improved by being firmly supported by the back portion 15.

  Further, the main quay structure 12 is provided with the reinforcing laying members 16, 16... For each desired height of the lining part 15, so that the backing materials 14, 14. ..., and the shear resistance of the entire back portion 15 is also enhanced.

  In the above-described embodiment, an example of using a grid-like member such as a geogrid as the reinforcing laying members 16, 16 ... has been described. However, the reinforcing laying members 16, 16 ... are not limited thereto. For example, it may be a net or a honeycomb structure.

  Furthermore, this invention is not limited to a sheet pile type structure, It can apply also to the gravity type quay structure using a bank body, such as a caisson, for the wall body 13 of the front.

  Furthermore, in the above-described embodiments, the case where the lengths of the reinforcing laying members in the turning radius direction are the same has been described. However, the lengths of the reinforcing laying members in the turning radius direction may be different. A long reinforcing laying member may be used on the side, and when each reinforcing laying member is raised to the wall member side, the edge in the radial direction end side may be substantially aligned.

  The quay structure according to the present invention includes a revetment and can be applied to structures such as rivers and lakes in addition to harbor structures.

DESCRIPTION OF SYMBOLS 10 Submarine ground 11 Water surface 12 Quay structure 13 Wall body 14 Backing stone 15 Backing part 16 Reinforcement laying member 17 Reclamation part 21 Water shielding sheet 22 Filling material 23 Lower filling layer 24 Upper filling layer 25 Upper work 30 Wall member 31 Steel sheet pile 32 Rotating support means 33 Abdominal raising member 34 Support member 35 Rotating shaft member 36 Horizontal member 37 Vertical member 40 Deployment member 41 Temporary fixing hook 42 Temporary fixing member

Claims (2)

A wall body installed on the front surface, a back portion formed by depositing a back material on the back side of the wall body, and a flexible net-like structure laid at every desired height of the back portion or In the construction method of a quay structure comprising a grid-like reinforcing laying member,
One end of each reinforcing laying member that is supported by the deploying member and deployed in the rotational radius direction and the direction intersecting with it is pivotally supported by the wall member constituting the wall body at every desired height. The rotational tip end of each reinforcing laying member is detachably temporarily fixed to the wall member in a state where the tip end side in the turning radial direction is raised to the wall member side,
In this state, the wall member is installed to construct the wall body, and then the step of putting the backing material to a desired height on the back side of the wall body and the temporary fixing of the reinforcing laying member are released. And the step of tilting the reinforcing laying member in the deployed state toward the back portion and laying the reinforcing laying member on the upper surface of the inserted back covering material is repeated sequentially from the lower side. How to build things.   The construction method of a quay structure according to claim 1, wherein the expansion member is formed in a frame shape arranged along an outer edge of the reinforcing laying material.

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