JP5136589B2 - Reinforcement beam and reinforcement method for underwater structure - Google Patents

Description

  The present invention relates to a reinforcing member and a reinforcing method for reinforcing an underwater structure such as an existing jetty, particularly a pile-type jetty in which an upper structure is supported by a plurality of piles.

In harbors and fishing ports, various underwater structures such as piers are provided for mooring ships. These underwater structures consist of a lower structure that has multiple stakes that are driven into the ground and project above the water surface, and an upper structure that is supported by these piles and laid above the water surface. Composed of things.
The piles as the above substructures are generally constructed by driving a plurality of pile groups in the vertical direction on the ground such as the seabed or lake bottom. Moreover, the above-mentioned superstructure is generally constructed by laying a plurality of beams on the upper ends of these pile groups and stretching a floor board between these beam groups.

By the way, about an existing underwater structure, it is necessary to reinforce an underwater structure for the reason described below.
・ Decrease in yield strength of underwater structures due to thickness reduction of piles due to corrosion ・ Responding to increased loading load ・ Improved seismic performance In particular, many of the submerged structures such as pile-type piers installed in the past have been assumed in recent years. It has not been designed to withstand major earthquakes that have become possible, and it is highly likely that underwater structures will be damaged by large earthquakes in the future, which will greatly affect social functions. It will be. In addition, underwater structures perform very important functions in the transportation of personnel and supplies for the rapid recovery of social functions after an earthquake.
For this reason, as a countermeasure against a large earthquake that is expected to occur in the future, there is an increasing need for seismic reinforcement of underwater structures such as existing pile-type piers.
And many proposals are conventionally made as a construction method for the above-mentioned reinforcement.

  Patent Document 1 describes that a reinforcing material for reinforcing an existing pier is unitized, manufactured in advance, and attached between piles at a construction site so as to minimize the site construction period. Has been. This reinforcing unit is composed of a rectangular frame-shaped frame, a brace provided in the frame, and a damper 8 provided between the brace and the frame.

  In Patent Document 2, a floater is attached to a strut member used to reinforce a pile on a jetty so that it floats on the water surface. A reinforcing method for joining both ends of the member is described. Patent Document 2 also describes that the strut members can be nested to make them extendable.

  In Patent Document 3, in a jetty that supports a floor set with pedestal columns, a seismic brace as diagonal material is provided between the pedestal columns to reduce the maximum bending moment acting on the pedestal and reduce the burden on the pedestal. In addition, it is described that the required pedestal diameter is reduced.

In Patent Document 4, a horizontal pipe for reinforcement is installed by installing a sheath pipe on each pile, and joining a hollow connection pipe protruding from the sheath pipe with a hollow connection pipe in a sheath pipe installed on an adjacent pile. It is described to form.
However, none of the methods described above can be said to have good workability from the viewpoint of adjusting the reinforcing member to the local pile.
In addition, the conventional method of reinforcing and connecting the piles with struts or brace members has the function of transmitting axial force, and laying them together to connect the piles in the sea for reinforcement. However, although the reinforcing effect is high, there is a problem that the number of members increases.

Japanese Patent Laid-Open No. 2007-217952 JP 2008-223384 A JP-A-11-269845 JP 2008-297815 A

  The present invention provides a reinforcing method excellent in workability for increasing the rigidity of an underwater structure by increasing the rigidity of the entire underwater structure by connecting piles of existing underwater structures with reinforcing beams underwater. The purpose is to do.

The inventors of the present invention have four wall bodies forming the front, rear, left and right side surfaces of the reinforcing beam, and an internal space formed by the wall bodies, the central partition section, the left and right first partition sections, and the first partition section. It consists of two partition walls that are divided into two compartments, and the bottom plate or bottom plate and top plate of the central compartment, with the central compartment as a buoyancy box, each of the first compartment and the second compartment Comprises a first pile connection portion and a second pile connection portion that are structured to be openable and closable so as to surround a part of the pile in the vertical direction and be attached to the pile. After the reinforcement beam is attached to the pile via the part and the second pile connection part, the above problem is solved by injecting the grout into the joint part between the pile and the pile connection part and integrating the reinforcement beam and the pile. The present invention was completed by finding out what can be done.
That is, the present invention is a reinforcing beam for reinforcing an underwater structure as described below, and a reinforcing method using the same.

(1) A reinforcing beam attached to a pile in order to reinforce an underwater structure having a plurality of piles whose lower ends are embedded in the underwater ground and an upper structure supported by the plurality of piles. The reinforcing beam includes four wall bodies forming the front, rear, left and right side surfaces, and an internal space formed by the wall bodies with a central partition portion and left and right first partition portions and second partition portions. It consists of two partition walls and a bottom plate or a bottom plate and a top plate of the central partition part, the central partition part constitutes a buoyancy box part, and the first partition part and the second partition part are part of the wall body as a reinforcing beam A first pile connecting portion and a second pile that form a lid portion that can be opened and closed with respect to the main body, and the first partition portion and the second partition portion surround a part of the pile in the vertical direction and can be attached to the pile. Reinforcing beam comprising a connecting part.
(2) A closing plate is provided on the upper and lower ends of the inner walls of the first pile connecting portion and the second pile connecting portion, or only on the upper end portion to close the space between the inner wall and the pile (1 ) Reinforcement beam as described in.
(3) The reinforcing beam according to (1) or (2), wherein a beam height of the reinforcing beam is not less than a diameter of a pile.
(4) The front wall of the first pile connecting portion and the second pile connecting portion constitutes a lid portion that can be opened and closed by a hinge with respect to the reinforcing beam main body (1) to (3) ) A reinforcing beam according to any one of the above.
(5) The reinforcing beam according to (4), wherein the lid is closed by bolting the lid to the reinforcing beam main body.
(6) Each of the first pile connection part and the second pile connection part is divided into two parts and connected via a hinge, and one divided part is a reinforcing beam body provided with the other divided part. The lid portion can be opened and closed, and the closure of the lid portion is performed by engaging the engagement pieces of the engagement joint provided in each of the lid portion and the reinforcing beam main body. The reinforcing beam according to any one of (1) to (3).
(7) An anchor member for preventing grout misalignment is provided on the inner wall surfaces of the first pile connecting portion and the second pile connecting portion, according to any one of (1) to (6), Reinforcement beam.
(8) In a reinforcement method for reinforcing an underwater structure having a plurality of piles whose lower ends are embedded in the underwater ground and an upper structure supported by the plurality of piles,
A step of floating the reinforcing beam according to any one of (1) to (7) on the water surface;
A step of guiding the reinforcing beam to the position of the two piles to which the reinforcing beam is to be attached;
A process of surrounding the pile by the wall surface of the pile connection part of the reinforcing beam;
The process of closing the lid of the pile connection,
And a process of injecting grout into the joint between the pile and the pile connecting portion to integrate the reinforcing beam and the pile,
Reinforcement method characterized by having.
(9) The reinforcing method according to (8), including a step of injecting a liquid into the buoyancy box of the reinforcing beam to sink the reinforcing beam to a predetermined depth.
(10) The reinforcing method according to (8) or (9), wherein a support material is attached to the pile, and the reinforcing beam is supported by the support material.
(11) Any one of (8) to (10), wherein a plurality of wires for guiding the reinforcing beam are attached to the reinforcing beam, and the reinforcing beam is guided to a predetermined position by operating the wire. Reinforcement method described in crab.
(12) As the reinforcing beam, a reinforcing beam provided with a closing plate only at the upper ends of the first pile connecting portion and the second pile connecting portion is used, and the support material also serves as a closing plate at the lower end portion. (10) or the reinforcing method according to (111).
(13) An underwater structure characterized by being reinforced by the reinforcing beam according to any one of (1) to (7).
(14) The underwater structure according to (13), wherein the natural period of the underwater structure is changed by filling the buoyancy box of the reinforcing beam with a solid material.

  The reinforcement method using the reinforcing beam of the present invention reinforces the pile in the height direction with the reinforcing beam itself, so the effect of combining the piles to transmit the bending moment in addition to the axial force is that using conventional struts and braces Therefore, the construction period can be shortened because the reinforcement can be performed with a small number of members. Further, the reinforcing method of the present invention can be reinforced without newly installing an underwater structure, and has little influence on the work of the underwater structure in service. In addition, since the reinforcing beam can be attached to the pile by wiring operation using buoyancy, construction is easy without requiring a large work ship, and the in-service period of the quay can be extremely shortened.

It is a figure which shows a mode that the reinforcement beam of this invention was attached to the pile. It is a figure which shows one Embodiment of the reinforcement beam of this invention. It is a figure explaining the support material and grout seal of a reinforcing beam in the present invention. It is a figure explaining the other example of the support material of a reinforcement beam in this invention, and a grout seal. It is a figure which shows other embodiment of the reinforcement beam of this invention. It is a figure which shows a mode that a reinforcement beam main body and a cover part are engaged and it closes using a coupling. It is a figure which shows the example of the shift prevention of the grout in this invention. It is a figure which shows the process of attaching a support material to a pile. It is a figure which shows the process of guide | inducing a reinforcement beam to the position of a predetermined | prescribed pile using a wire. It is a figure which shows the process of surrounding a pile by the pile connection member of a reinforcement beam. It is a figure which shows the process of closing the cover body of the pile connection member of a reinforcement beam. It is a figure which shows the process of completing closing of the cover body of the pile connection member of a reinforcement beam. It is a figure which shows the process of dropping a reinforcement beam to predetermined depth, mounting on a support material, injecting grout, and completing attachment of a reinforcement beam.

FIG. 1 is a view showing a state in which a reinforcing beam of the present invention is attached to a pile, and FIG. 2 is a view showing details of the reinforcing beam.
As shown in FIG. 1, the height (beam height) of the reinforcing beam 1 of the present invention is larger than the diameter of the pile 11, the beam height is made larger than the diameter of the pile, and the reinforcing beam is a shallow pile below the water surface. It is preferable to attach to the part from the point of increasing the reinforcing effect. In the case shown in FIG. 1, the reinforcing beam has a beam height of 2000 mm and a beam width of 1500 mm for a pile having a pile diameter of 1200 mmφ.

  As shown in FIG. 2 (a), the reinforcing beam 1 includes four wall bodies 2 on the front, rear, left and right sides, and an inner space formed by the wall body 2 as a central partition portion 4, left and right first partition portions 5 and second partitions. It consists of two partition walls 3 divided into a part 6, a bottom plate 14 and a top plate 15 of the central partition part 4. The central partition part 4 constitutes a buoyancy box part 4, and a first partition part 5 and a second partition part 6. The front wall is a lid 8 that can be opened and closed, and constitutes a first pile connecting portion 5 and a second pile connecting portion 6 for attaching the reinforcing beam 1 to the pile. In the case shown in FIG. 2A, the lid portion can be opened and closed by a hinge, and is fastened to the reinforcing beam main body by a bolt.

  The buoyancy box 4 has a container shape when only the bottom plate is provided, and has a sealed structure when the bottom plate and the top plate are provided, so that the reinforcing beam 1 is floated on the water surface by the buoyancy. Can do. The buoyancy box 4 can be filled with water, and the reinforcing beam 1 can be allowed to sink below the water surface by injecting liquid such as water or seawater into the space inside the buoyancy box. By making the buoyancy box part a sealed structure, an appropriate amount of liquid is injected into the buoyancy box part to balance the weight and buoyancy of the reinforcing beam, thereby facilitating the attachment work of the reinforcing beam. In addition, since the normal usage pattern of the reinforcing beam is to float on the water surface, move to a predetermined location, and then sink to a predetermined depth, the buoyancy box 4 is provided with a bottom plate and a top plate, However, there is a case where a submerging operation is not necessary, and in this case, it is not always necessary to provide a top plate.

The 1st pile connection part 5 consists of the wall body 2, the partition wall 3, and the closing board 9 provided in the upper end part and lower end part of this wall body 2 and the partition wall 3, and the 2nd pile connection part 6 Also has the same structure as the first pile connecting portion 5. The grout seal 10 shown in the figure is a member attached to a support member 12 that supports the reinforcing beam 1 as shown in FIG. The grout seal 10 attached to the closing plate 9 and the support member 12 provided at the lower ends of the first connecting part 5 and the second connecting part 6 is the first pile connecting part 5 and the second pile connecting part 6 are piles 11. , 11 'is enclosed, the lower end part of the space formed by the pile connecting part and the pile is closed. The closing plate 9 and the grout seal 10 are attached to the piles 11 and 11 ′ after the pile connection parts 5 and 6 are attached to the pile 11 and the pile connection parts 5 and 6. Prevents the grout injected when 5 and 6 are integrated together from leaking out.
As will be described later, the closing plate 9 may be provided only at the upper end portions of the inner walls of the first and second pile connecting portions when the support material also serves as the closing plate.
In addition, in this specification, although the case where grout is used in order to integrate a reinforcement beam and a pile is demonstrated, you may use concrete instead of grout.

3 and 4 show an example of the support material 12 that supports the reinforcing beam. The support material can be composed of a receiving material and a supporting plate that supports the receiving material.
In the example shown in FIG. 3A, the support material 12 includes a receiving material 17 divided into four parts and a plurality of support plates 13, and each receiving material 17 and each support plate 13 are arranged before the reinforcement beam 1 is constructed. It is attached to the pile 11 by underwater welding or bolts. The support member 12 has a function of positioning the reinforcing beam in the vertical direction and temporarily supporting a load at the time of placing the grout. FIG. 3B is a top view of the support member 12 of FIG. As shown in FIG. 3C, a grout seal 10 is attached to the upper surface of the receiving member 17, and the gap between the closing plate 9 and the support member 12 is sealed to prevent the grout from leaking when the grout is placed.

FIG. 4 is a view showing another embodiment of the support material. In this example, as shown in FIG. 4B, the support material includes a receiving material 17 divided into four parts and a plurality of support plates 13. The grout seal having the same quadrangular appearance is placed thereon, and the gap between the wall body end of the bottom of the pile connecting portion and the support material is sealed with a grout seal. . In this way, the supporting material also serves as a closing plate for the first and second pile connecting portions, so that the closing plate on the bottom side of the pile connecting portion as shown in FIG. 3 can be omitted. In FIG. 4C, the end member 16 is provided at the end of the wall to ensure the sealing effect. However, this end member can be omitted when the wall has a sufficient thickness. .
In the reinforcing beam after construction, the bolt resists the tensile force, and the grout resists the compressive force received by the reinforcing beam.

In the above example, the lid portions 8 of the pile connecting members 5 and 6 of the reinforcing beam 1 are bolted to the reinforcing beam main body, but the operation of bolting the lid portion of the reinforcing beam 1 is poor in workability. 5 shows an example of a reinforcing beam that does not use bolts as another example.
The structure shown in FIG. 5 has a structure in which each of the first pile connection portion and the second pile connection portion is divided into two, and the lid portion 21 can be opened and closed with respect to the reinforcing beam main body portion 20. . 5 (a) and 5 (b) are diagrams showing the overall configuration of the reinforcing beam. The reinforcing beam 1 includes a buoyancy box part 4, a first pile connection part 5, and a second pile connection part 6. Part 4 and part of pile connection parts 5 and 6 constitute reinforcing beam main body part 20, the rest of pile connection parts 5 and 6 constitute lid part 21, and reinforcing beam main body part 20 and lid part 21 are hinges. It is connected by a (rod) joint 23, and the lid 21 can be opened and closed with respect to the reinforcing beam main body 20 by this hinge (rod) joint. An engagement joint is provided at the abutting portion between the reinforcing beam main body 20 and the lid portion 21, and the lid portion 21 can be closed to the reinforcing beam main body 20 by the engagement joint 22.
FIG. 5B shows a state where the lid portion 21 is closed, and the meshing joint portion 22 is provided in the height direction of the reinforcing beam 1 as shown in FIG. 5C.

FIG. 6 is a diagram showing details of the meshing joint 22 and showing a process until the meshing joint 22 is engaged.
FIG. 6A shows a state in which the lid 21 is pushed toward the reinforcing beam main body 20, and a locking piece 25 is provided on each of the reinforcing beam main body and the lid.
FIG. 6B shows a state in which the locking piece 25 of the lid portion 21 has fallen as a result of pushing the lid portion 21 toward the reinforcing beam main body portion 20.
In this state, when grout is injected into the pile joint portion, the lid portion 21 moves backward as shown in FIG. 6C due to the internal pressure caused by the grout of the pile connecting portion, and the locking piece 25 of the lid portion 21 and the reinforcing beam main body portion The 20 locking pieces 25 are engaged with each other, and then the grout is solidified.
FIG. 6D shows a state in which solidification is completed and the meshing joint 22 is firmly fixed. In this state, the mesh joint 22 resists the tensile force, and the grout resists the compressive force.
Moreover, it is preferable to provide a taper at the tip of the joint as shown in FIG. 6 (e) so that the joint portion of the lid portion 21 can easily enter the joint portion of the main body.

A grout shift can be prevented by providing an anchor member for preventing a grout shift as shown in FIG. 7 on the inner wall of the pile connecting portion.
FIG. 7 (a) shows a stud provided on the strut wall surface, FIG. 7 (b) shows a steel bar fixed to the strut wall surface by welding, and FIG. 7 (c) shows a weld bead formed on the strut wall surface. Is.

Next, the work procedure of the method of attaching the reinforcing beam to the pile will be described in the case of using the reinforcing beam shown in FIG.
FIG. 7 is a diagram showing a process of deciding a position for attaching the reinforcing beam to the pile and attaching a support material for temporarily supporting the load of the reinforcing beam at the time of grout placement by underwater welding or a bolt. Is a front view, and FIG. 7B is a plan view.

  FIG. 8 shows a process of guiding the reinforcing beam to a predetermined pile position. As shown in FIG. 8B, four wires 26 for guiding the reinforcing beam to predetermined positions are provided at the four corners of the reinforcing beam 1. The reinforcing beam 1 is floated on the surface of the water by the buoyancy of the buoyancy box, and the reinforcing beam 1 is guided to the target pile position by winding the wire around an appropriate pile and winding each wire by the winch 27.

FIG. 10 is a view showing a process of guiding the reinforcing beam 1 to a predetermined pile 11 and temporarily fixing it to the pile. The lid 8 is opened, and the pile connecting portion of the reinforcing beam 1 guided to the predetermined pile by wire operation surrounds the pile.
FIG. 11 shows a state where the lid portion is closed, and FIG. 12 shows a state where the lid portion is closed and the bolt is fastened to complete the closing of the lid portion.

FIG. 13 shows a state in which liquid (water, seawater, etc.) is injected into the buoyancy box and the reinforcing beam is lowered to a predetermined depth and supported by the support. Then, grout is inject | poured into the pile connection part of a pile connection part, it is made to solidify, and a reinforcement beam and a pile are integrated, A reinforcement work is complete | finished.
Note that, by appropriately adjusting the position of the support, a part of the reinforcing beam may appear on the water surface, or the reinforcing beam may be attached to the pile at a deeper position, as shown in FIG. Thus, a high reinforcing effect can be obtained by attaching to a shallow position below the water surface.

As described above, it is preferable that the reinforcing beam of the present invention is made of a material having rigidity higher than that of the pile, and the height of the beam is larger than the diameter of the pile. Since the pile is covered with a member with a high beam height and the pile is reinforced in the height direction with the reinforcing beam itself, the effect of combining the piles to transmit the bending moment in addition to the axial force is that of using conventional struts and braces. It will be higher than that. And since such an effect enables reinforcement with a small number of members, the construction period can be shortened. In the reinforcement of the existing jetty, it is essential to shorten the construction period, so that the reinforcing method of the present invention is particularly effective.
In addition, in the event of an earthquake, the ground shows the characteristics of the period of shaking (earthquake-dominated period), while reinforcing piles of underwater structures are reinforced by reinforcing beams, and heavy solid materials (for example, in the buoyancy box of the reinforcing beams) Concrete, gravel, etc.) can be constructed to weight the underwater structure, and the seismic resistance can be improved by changing the natural period of the underwater structure and separating the natural period of the underwater structure from the seismic dominant period.

  According to the reinforcing method of the present invention, the work is easy and rapid construction is possible, so there is little influence on the work of the underwater structure in service, and the reinforcing body is piled by wire operation while utilizing buoyancy. Therefore, the construction work is easy and the construction period can be shortened without requiring a large work boat, so that it is suitable as a reinforcing method for pile-type underwater structures.

DESCRIPTION OF SYMBOLS 1 Reinforcement beam 2 Wall body 3 Partition wall 4 Buoyancy box part (central partition part)
5 1st pile connection part (1st division part)
6 2nd pile connection part (2nd division part)
7 Hinge 8 Lid 9 Closing plate 10 Grout seal 11, 11 'Pile (existing pile)
DESCRIPTION OF SYMBOLS 12 Support material 13 Support plate 14 Bottom plate 15 Top plate 16 End member 17 Receiving material 20 Reinforcement beam main body part 21 Cover part 22 Engagement joint 23 Hinge (rod) joint 24 Pile joint part 25 Locking piece 26 Wire 27 Winch

Claims (14)

  A reinforcing beam attached to a pile to reinforce an underwater structure having a plurality of piles having lower ends embedded in the underwater ground and an upper structure supported by the plurality of piles, the reinforcement The beam is divided into four walls forming the front, rear, left and right side surfaces, and an internal space formed by the walls is divided into a central partition and first and second partitions. It consists of two partition walls and the bottom plate or the bottom plate and the top plate of the central partition part, the central partition part constitutes a buoyancy box part, and the first partition part and the second partition part are part of the wall body with respect to the reinforcing beam body The lid part which can be opened and closed is formed, the 1st division part and the 2nd division part enclose a part of the vertical direction of a pile, and can attach the 1st pile connection part and the 2nd pile connection part which can be attached to a pile. Reinforcement beam characterized by comprising.   The closing plate which plugs between the said inner wall and a pile is provided in the upper end part and lower end part of the inner wall of a 1st pile connection part and a 2nd pile connection part, or only in an upper end part, It is characterized by the above-mentioned. Reinforcement beam.   The reinforcing beam according to claim 1 or 2, wherein a beam height of the reinforcing beam is not less than a diameter of a pile.   The front wall of each of the first pile connecting portion and the second pile connecting portion constitutes a lid portion that can be opened and closed by a hinge with respect to the reinforcing beam main body. Reinforcement beam as described.   The reinforcing beam according to claim 4, wherein the closing of the lid portion is performed by bolting the lid portion to the reinforcing beam main body.   Each of the first pile connection part and the second pile connection part is divided into two parts and connected via a hinge, and one of the divided parts can be opened and closed with respect to the reinforcing beam body provided with the other divided part. A lid portion is formed, and the closure of the lid portion is performed by engaging a locking piece of a meshing joint provided on each of the lid portion and the reinforcing beam main body. The reinforcing beam according to any one of 1 to 3.   The reinforcing beam according to any one of claims 1 to 6, wherein an anchor member for preventing grout displacement is provided on inner wall surfaces of the first pile connecting portion and the second pile connecting portion. In a reinforcement method for reinforcing an underwater structure having a plurality of piles whose lower ends are embedded in the underwater ground and an upper structure supported by the plurality of piles,
A step of floating the reinforcing beam according to any one of claims 1 to 7 on a water surface;
A step of guiding the reinforcing beam to the position of the two piles to which the reinforcing beam is to be attached;
A process of surrounding the pile by the wall surface of the pile connection part of the reinforcing beam;
The process of closing the lid of the pile connection,
And a process of injecting grout into the joint between the pile and the pile connecting portion to integrate the reinforcing beam and the pile,
Reinforcement method characterized by having. The reinforcing method according to claim 8, further comprising a step of injecting a liquid into a buoyancy box of the reinforcing beam to sink the reinforcing beam to a predetermined depth.   The reinforcing method according to claim 8 or 9, wherein a support material is attached to the pile, and the reinforcing beam is supported by the support material. 11. The reinforcement according to claim 8, wherein a plurality of wires for guiding the reinforcing beam are attached to the reinforcing beam, and the reinforcing beam is guided to a predetermined position by operating the wire. Construction method.   A reinforcing beam having a closing plate provided only at the upper end portions of the first pile connecting portion and the second pile connecting portion is used as the reinforcing beam, and the support material also serves as a closing plate at the lower end portion. Item 10. The reinforcing method according to item 10 or 11. An underwater structure reinforced by the reinforcing beam according to claim 1. The underwater structure according to claim 13, wherein the natural period of the underwater structure is changed by filling the buoyancy box of the reinforcing beam with a solid material.

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