JP7342756B2 - Jackets, jacket structures and methods of constructing jacket structures - Google Patents

Description

Article 30, Paragraph 2 of the Patent Act applies Provided by: Echo Co., Ltd. Head Office (2-6-4 Kitaueno, Taito-ku, Tokyo) Provided on: September 2, 2019

The present invention relates to a jacket, a jacket structure, and a method for constructing a jacket structure, and specifically relates to a jacket suitable for providing a synthetic deck as a superstructure, a jacket structure using the jacket, and a method for constructing the jacket structure. Concerning construction methods suitable for

Jacket structures, in which a jacket made of assembled steel materials is attached and fixed to steel pipe piles, and a concrete slab is installed on top of the jacket, are often used as pier structures, etc., and the standard construction method is is described in, for example, Non-Patent Documents 1 and 2.

From the viewpoint of workability, precast slabs are often used as the concrete slabs installed on the top of the jacket, and a construction method using precast slabs is described, for example, in Patent Document 1. .

JP2019-52424A

Coastal development technology library no. 7. “Jacket construction method technical manual”, Coastal Development Technology Research Center, published in January 2000. “Port New Technology/New Construction Method Estimation Standards Library”, Port and Airport Construction Technology Service Center, published on April 1, 2007.

However, it has been found that the jacket structures found in the prior art have the following problems.

1) The spacing between the upper girders of the jacket is narrow at most, about 5 m, in order to support the precast slab. Therefore, the number of girder members is large, and the number of assembly steps is large. Furthermore, since the number of members of the girder is large, it is difficult to sufficiently coat the edges of the girder with anti-corrosion coating.

2) When constructing a jacket structure using precast slabs, there is a lot of work to be done from the sea, such as when installing the jacket, so there are many opportunities to secure the necessary workboats, and the period of time when the workboats are used is also long. As a result, it becomes longer. This causes the following problems.

2-1) The impact on the use of adjacent quays for port cargo handling and ship navigation will be significant.

2-2) The impact on fisheries and the environment will increase.

2-3) Because work vessels are used for a long period of time, they are easily affected by sea conditions.In addition, work vessels with a small number of vessels (such as crane vessels) are susceptible to the availability of such work vessels. , which tends to prolong the construction period on site.

The present invention has been made in view of these points, and can ensure sufficient corrosion resistance as a water body structure, shorten the period of use of a work boat, and in turn shorten the construction period on site. An object of the present invention is to provide a jacket, a jacket structure, and a method for constructing a jacket structure.

The present invention solves the above problems using the following jacket, jacket structure, and jacket structure construction method.

That is, the jacket according to the present invention is a jacket installed above a plurality of piles, and includes a plurality of steel pipe legs each having an inner cavity into which each of the plurality of piles can be inserted, and an upper end of the plurality of steel pipe legs. a plurality of upper girders connecting the sections, and a plurality of upper girders attached to the plurality of upper girders by welding or mechanical joining, and covering the space between the plurality of upper girders from above, while the inner cavity of the steel pipe leg is This jacket is characterized by comprising an upper steel plate configured so as not to be covered from above.

In this application, when interpreting words that refer to the vertical positional relationship, such as "above," "upper end," "upper surface," and "lower surface," regarding the jacket, it is assumed that the jacket is The vertical positional relationship shall be determined while the product is installed on the designated pile.

Moreover, "connecting the upper ends of the steel pipe legs" means connecting the upper ends of the steel pipe legs so that necessary stress transmission is possible. The meaning of "connection" shall be interpreted in the same manner in other parts of this application.

Here, "mechanical joint" refers to a joint that is connected by a mechanical action, such as a bolt joint.

A reinforcing portion for reinforcing the upper steel plate may be provided on the upper surface of the upper steel plate.

The reinforcing portion may be integrally formed with the upper steel plate.

The reinforcing portion may be a steel material having a T-shaped cross section and disposed on the upper surface of the upper steel plate so that the flange portion faces upward.

It is preferable that a linear protrusion is provided on the upper surface of the flange portion of the steel material having the T-shaped cross section in the width direction of the flange portion.

The reinforcing portion may be a stud dowel provided on the upper surface of the upper steel plate.

A stud dowel may be provided on the upper surface of the upper girder.

The spacing between the upper girders may be 4 m or more and 12 m or less.

A heavy anti-corrosion coating may be applied to the outer surface of a portion of the upper girder other than the upper surface and the lower surface of the upper steel plate.

In this application, the "outer surface" refers to the surface that comes into contact with the outside atmosphere.

An organic zinc-rich primer may be applied to the upper surface of the upper girder and the upper surface of the upper steel plate.

The upper steel plate may have a thickness that allows a vehicle to be directly placed on the upper surface.

A first aspect of the jacket structure according to the present invention includes the jacket and a plurality of steel pipe legs that are cast into the ground of a water body and that are each insertable into the inner cavity of each of the plurality of steel pipe legs of the jacket. A jacket structure comprising: a plurality of piles, and corresponding one of the plurality of steel pipe legs is inserted into an inner cavity of each of the plurality of steel pipe legs and connected to the plurality of steel pipe legs.

A second aspect of the jacket structure according to the present invention includes the jacket and an inner cavity of each of the plurality of steel pipe legs of the jacket, which is cast into the ground of a water body and is provided with the reinforcement part. a plurality of stakes, each of which can be inserted into the plurality of steel pipe legs, and corresponding ones of the plurality of piles are inserted into and connected to the inner cavity of each of the plurality of steel pipe legs; This jacket structure is characterized in that by arranging a bed member thereon, a vehicle can be placed on the arranged bed member and the vehicle can run on the bed member.

A third aspect of the jacket structure according to the present invention is characterized in that the jacket is provided with the upper steel plate having a thickness such that a vehicle can be directly mounted on the upper surface, and the jacket is cast in the ground of a water area, and A plurality of stakes each of which can be inserted into the inner cavity of each of the plurality of steel pipe legs, and corresponding ones of the plurality of piles are each inserted into the inner cavity of each of the plurality of steel pipe legs. The jacket structure is characterized in that a vehicle can be mounted on the upper steel plate and that the vehicle can run on the upper steel plate.

In the present application, vehicles include construction vehicles such as crane trucks, piling cranes, concrete mixer trucks, and concrete pump trucks.

The inner diameter of the plurality of steel pipe legs of the jacket is larger than the outer diameter of the corresponding one of the plurality of piles, and the plurality of steel pipe legs of the jacket have an upper end portion of the corresponding one of the plurality of piles. The steel pipe leg may be arranged so as to cover the pile, and grout may be filled between the inner circumferential surface of the steel pipe leg and the outer circumferential surface of the pile so that they are integrated.

The pile may be a steel pipe pile.

Preferably, a composite deck slab is formed by pouring concrete above the upper girder of the jacket and above the upper steel plate.

A first aspect of the method for constructing a jacket structure according to the present invention is a construction method for constructing a jacket structure, which includes a transportation step of transporting the jacket to a site water area at a construction point; A jacket installation step in which the jacket is installed with stakes in the on-site water area at the construction point, and a composite deck slab forming step in which concrete is poured on top of the upper steel plate of the jacket installed in the jacket installation step to form a composite deck slab. A method for constructing a jacket structure, comprising:

A second aspect of the method for constructing a jacket structure according to the present invention is a construction method for constructing a jacket structure, in which a plurality of steel pipe piles constituting the jacket structure are placed in the ground of a water area at a construction site. a preceding pile driving step in which the jacket is driven in advance, a transportation step in which the jacket is transported to the site water area at the construction point, and a step in which the upper end of the steel pipe pile previously driven in the preceding pile driving step a jacket installation step in which the jacket is placed so as to cover the steel pipe leg at a corresponding position of the transported jacket; a pile driver placement step in which a pile driver is placed on the jacket; and the jacket structure is constructed. Among the plurality of steel pipe piles, the remaining steel pipe piles that have not been driven in the preceding pile driving step are inserted into the inner spaces of the steel pipe legs at corresponding positions in the jacket installed in the jacket installation step. A post-driven pile driving connection step in which the pile is driven by a pile driver placed in the pile driver placement step, connected to the jacket, and the jacket is supported, and the pile driven in the post-driven pile driving connection step This method of constructing a jacket structure is characterized by comprising a composite deck forming step of forming a composite deck by pouring concrete onto the upper steel plate of the jacket connected and supported by steel pipe piles.

Note that in the first and second aspects of the method for constructing a jacket structure according to the present invention, installation of the jacket in the jacket installation step is completed at a stage when the jacket and the steel pipe pile are integrated. . This integration may be accomplished by inserting the steel pipe pile into part or all of the inner cavity of the steel pipe leg at the corresponding location of the jacket placed at a predetermined position. Further, this integration may be performed by further filling grout between the outer circumferential surface of the upper end of the steel pipe pile inserted and the inner circumferential surface of the lower end of the steel pipe leg and hardening the grout.

According to the present invention, a jacket, a jacket structure, and a jacket structure that can secure sufficient corrosion resistance as a water body structure, shorten the period of use of a work boat, and shorten the construction period on site. A construction method can be provided.

A perspective view showing a jacket structure 10 according to a first embodiment of the present invention Enlarged perspective view showing a part of FIG. 1 enlarged A cross-sectional view of the composite deck slab 30 included in the jacket structure 10 (a vertical cross-sectional view perpendicular to the longitudinal direction of the T-shaped reinforcing steel member 22) Vertical sectional view showing a specific example of how the upper steel plate 20 is attached to the upper flange 16A of the upper girder 16 Vertical sectional view showing a specific example of how the upper steel plate 20 is attached to the upper flange 16A of the upper girder 16 Vertical sectional view showing a specific example of how the upper steel plate 20 is attached to the upper flange 16A of the upper girder 16 Vertical sectional view showing a specific example of how the upper steel plate 20 is attached to the upper flange 16A of the upper girder 16 A diagram schematically showing one typical process when constructing the jacket structure 10 according to the first embodiment A diagram schematically showing one typical process when constructing the jacket structure 10 according to the first embodiment A diagram schematically showing one typical process when constructing the jacket structure 10 according to the first embodiment A diagram schematically showing one typical process when constructing the jacket structure 10 according to the first embodiment A diagram schematically showing one typical process when constructing the jacket structure 10 according to the first embodiment A diagram schematically showing one typical process when constructing the jacket structure 10 according to the first embodiment A diagram schematically showing one typical process when constructing the jacket structure 10 according to the first embodiment A perspective view showing a jacket structure 50 according to a first modification of the jacket structure 10 according to the first embodiment, and a jacket 50A and a synthetic floor slab 50B included in the jacket structure 50 A plan view showing a jacket structure 52 according to a second modification of the jacket structure 10 according to the first embodiment A vertical sectional view schematically showing the upper girder 16 and its vicinity of the jacket structure 60 according to the second embodiment of the present invention A diagram schematically showing the structure of the heavy anti-corrosion coating 62 provided on the lower surface of the upper steel plate 20 Vertical sectional view showing a specific example of how the upper steel plate 20 is attached to the upper flange 16A of the upper girder 16

Embodiments of the present invention will be described in detail below with reference to the drawings. In the following description, a case will be described in which the present invention is applied to a pier structure, but the scope of application of the present invention is not limited to pier structures.

(1) First Embodiment (1-1) Configuration and Effects FIG. 1 is a perspective view showing a jacket structure 10 according to a first embodiment of the present invention, and FIG. 2 shows a part of FIG. 1. It is an enlarged perspective view shown enlarged. The jacket structure 10 is installed on the ground 200 of a water area 100 (see FIGS. 8 and 10 to 14), but for convenience of illustration, water existing in the water area is omitted in FIGS. 1 and 2. There is also no indication of water area 100. FIG. 3 is a cross-sectional view (a vertical cross-sectional view perpendicular to the longitudinal direction of the T-shaped reinforcing steel material 22) of the composite deck slab 30 included in the jacket structure 10.

The jacket structure 10 according to the first embodiment is a pier structure provided along a quay 300, and as shown in FIG. A jacket 12 is attached to the upper end portions of a plurality of steel pipe piles 80 arranged in a matrix shape in the vertical and horizontal directions when viewed from above.

As shown in FIGS. 1 and 2, the jacket 12 includes a leg 14, an upper beam 16, a connecting steel member 18, an upper steel plate 20, a T-shaped reinforcing steel member 22, and a stud dowel 24. A plurality of upper girders 16 connect the upper ends of the legs 14 to each other, and a large number of connecting steel members 18 connect parts other than the upper ends of the legs 14 to each other, and connect parts other than the upper ends of the legs 14 to each other. The skeleton of the jacket 12 is constructed by connecting the upper beam 16 to other parts than the ends. The upper steel plate 20 is attached to the upper flange 16A (see FIGS. 4 to 7) of the upper girder 16, and covers the space between the upper girders 16 from above. A reinforcing steel material 22 is attached. Further, as shown in FIG. 2, a large number of stud dowels 24 are attached to the upper surface of the upper flange 16A of the upper girder 16. The jacket 12 having such a configuration is previously manufactured at a factory before being delivered to the site, and the manufactured jacket 12 is transported to the water area at the installation point by a barge or the like.

The leg 14 is a steel pipe member connected to the steel pipe pile 80, and its inner diameter is larger than the outer diameter of the steel pipe pile 80 to which it is connected. When installing the jacket 12 in the on-site water area, the lower end of the leg 14 is placed over the upper end of the steel pipe pile 80, and the outer circumferential surface of the upper end of the steel pipe pile 80 and the inner circumferential surface of the lower end of the leg 14 Grout (not shown) is filled between the two and integrated.

In the jacket structure 10 according to the first embodiment, the legs 14 are arranged so that the longitudinal direction thereof is vertical, but in the jacket structure according to the present invention, the legs 14 are arranged so that the longitudinal direction is vertical. It is not essential that they be arranged in the same direction, but they may be arranged so that their longitudinal direction is inclined with respect to the vertical direction, depending on the site situation, design conditions, etc. In that case, the driving direction of the corresponding steel pipe pile will also match the direction of the leg arranged at an angle with respect to the vertical direction.

The upper girder 16 is a girder member that connects the upper ends of the legs 14, and is made of steel with an H-shaped cross section. Both ends of the upper beam 16 are connected to the upper ends of the legs 14, and the upper beam 16 is arranged so that its longitudinal direction is parallel to the horizontal direction. As shown in FIG. 2, a connection flange 14A is provided at the joint between the leg 14 and the upper spar 16 at the same height as the upper flange 16A of the upper spar 16. 16A and the outer peripheral surface of the leg 14 by welding, and a connecting flange 14B is provided at the same height as the lower flange 16B of the upper girder 16. It is attached to the end of the leg 16B and the outer peripheral surface of the leg 14 by welding, so that stress can be smoothly transmitted between the leg 14 and the upper girder 16. The height position of the upper surface of the upper flange 16A of the upper girder 16 and the height position of the upper surface of the connecting flange 14A are substantially the same as the height position of the upper end of the leg 14.

An upper steel plate 20 is attached to the upper flange 16A of the upper girder 16, and the upper girder 16 not only plays the role of forming the skeleton of the jacket 12, but also supports the upper steel plate 20 and supports the composite deck slab 30. It also has a role.

Further, a stud dowel 24 is attached to the upper surface of the upper flange 16A of the upper girder 16, and the concrete 34 of the composite deck slab 30 is strongly integrated with the upper flange 16A of the upper girder 16 via the stud dowel 24. do. As shown in FIG. 2, the stud dowel 24 is attached not only to the upper surface of the upper flange 16A of the upper beam 16 but also to the upper surface of the connecting flange 14A and the upper surface of the leg lid 14C. However, the arrangement and number of stud dowels 24 may be changed as appropriate depending on design conditions and the like.

Note that an outer frame upper girder 42 supported by a cantilever upper girder 40 is provided on the outer peripheral edge of the jacket structure 10 according to the first embodiment, and the synthetic floor slab 30 is located outside the legs 14. The jacket structure 10 is provided so as to protrude from the jacket structure 10, making it easier for ships to dock at the jacket structure 10. As shown in FIG. 2, stud dowels 24 are also provided on the upper surfaces of the cantilever upper beam 40 and the outer frame upper beam 42.

The upper steel plate 20 is a member that becomes the bottom steel plate of the composite deck slab 30, and its thickness is typically 6 to 8 mm, but the range of usable steel plate thickness is not limited to this range. For example, a steel plate with a thickness of 6 to 12 mm can be used, and a steel plate with a larger thickness can also be used.

The upper steel plate 20 covers the space between the upper girders 16 from above, but is attached to the upper end of the upper girder 16 so as not to cover the inner cavity of the leg 14 from above. Therefore, after attaching the jacket 12 to the previously driven steel pipe pile 80, the remaining steel pipe pile 80 can be inserted through the leg 14 and driven. It is also possible to fill grout (not shown) from above between the outer circumferential surface of the groove and the outer peripheral surface of the groove. However, before pouring the concrete 34 of the composite slab 30, the leg lid 14C is attached to the upper end of the leg 14. When attaching the leg cover 14C to the upper end of the leg 14, the outer circumference of the leg cover 14C is usually attached to the inner circumferential surface of the upper end of the leg 14 by welding.

A T-shaped reinforcing steel material 22, which is a steel material with a T-shaped cross section, is attached to the upper surface of the upper steel plate 20 to reinforce the upper steel plate 20, and the end of the upper steel plate 20 is attached to the upper flange of the upper girder 16. 16A, by laying a laying steel plate (not shown) on top of the T-shaped reinforcing steel 22, even before concrete 34 is poured to form the composite deck slab 30, the laying of the steel plate (not shown) can be done. Vehicles such as crane trucks, piling cranes, concrete mixer trucks, concrete pump trucks, etc. can be passed or placed on the steel plate, and work efficiency equivalent to land-based work can be ensured.

The upper steel plate 20 of the embodiment has a T-shaped reinforcing steel member 22, which is a separate member, attached to it to ensure strength so that a vehicle such as a crane truck can be passed through and placed on it. It may be formed integrally with the same shape as the reinforcing portion, such as the shape reinforcing steel material 22. Further, the shape of the reinforcing portion is not particularly limited as long as a reinforcing effect on the upper steel plate 20 can be obtained, and the shape of the reinforcing portion may be a T-shape, for example, a wave shape or an uneven shape.

In addition, by increasing the thickness of the upper steel plate 20, it is possible to use a crane truck, a piling crane, a concrete mixer truck, a concrete pump, etc. without providing a reinforcing part such as the T-shaped reinforcing steel material 22 on the upper surface of the upper steel plate 20. Vehicles such as cars can be supported from below, allowing them to pass or be placed there, and it is also possible to ensure work efficiency equivalent to land-based work.

A haunch portion 20A is formed at the end of the upper steel plate 20, and the end of the haunch portion 20A is attached to the upper flange 16A of the upper girder 16.

The manner in which the upper steel plate 20 is attached to the upper flange 16A of the upper girder 16 is not particularly limited. For example, as shown in the vertical cross-sectional view of FIG. The upper part may be attached by welding (for example, fillet weld 20B) to the upper surface, or, as shown in the vertical cross-sectional view of FIG. The end of the steel plate 20 may be inserted through a through hole (not shown) and tightened with a nut 16D. The bolt 16E may be inserted into a through hole (not shown) at the end of the upper steel plate 20 and then tightened with a nut 16F for attachment. Alternatively, for example, as shown in the vertical cross-sectional view of FIG. 7, the end side surface of the upper steel plate 20 may be attached to the side end of the upper flange 16A of the upper girder 16 by welding (for example, butt welding 20C). However, in the case of mechanical connection as in the connection mode shown in FIGS. 5 and 6, a waterproof seal 16G is provided between the lower surface of the end of the upper steel plate 20 and the upper surface of the upper flange 16A of the upper girder 16. This prevents cement and the like from leaking out from the gaps when concrete 34 of the composite floor slab 30 is poured.

Since the upper steel plate 20 is attached to the upper flange 16A of the upper girder 16, its position will not shift even if the jacket 12 is subjected to rocking or the like when being transported to a water area at the installation site.

As shown in FIGS. 4 to 7, a threaded stud 16A1 is attached by welding at the center of the upper flange 16A of the upper girder 16 in the width direction and directly below the web 22A of the T-shaped reinforcing steel member 22. A high nut 16A2 is attached to the upper end of the screw stud 16A1, and the upper end surface of the high nut 16A2 is in contact with a reinforcing plate 22A1 that is attached to the lower end surface of the web 22A of the T-shaped reinforcing steel material 22 by welding. . The reinforcing plate 22A1 reinforces a portion of the T-shaped reinforcing steel material 22 located above the upper girder 16.

The dead weight of the T-shaped reinforcing steel 22 and concrete 34 of the composite deck slab 30 is transmitted to the upper surface of the upper flange 16A of the upper girder 16 via the threaded stud 16A1 and the tall nut 16A2. The position of the high nut 16A2 is adjusted to adjust the contact state of the high nut 16A2 to the reinforcing plate 22A1, and the self weight of the T-shaped reinforcement steel 22 of the composite deck 30 and the concrete 34 is adjusted to the screw stud 16A1 and the high nut 16A2. so that it is properly transmitted to the upper surface of the upper flange 16A of the upper spar 16.

The synthetic floor slab 30 is the upper structure of the jacket structure 10, and when the jacket structure 10 is used as a pier structure, it serves as a direct scaffold for cargo, vehicles, and the like.

The composite floor slab 30 includes an upper steel plate 20, a T-shaped reinforcing steel member 22, a stud dowel 24, reinforcing bars 32 (main reinforcing bars 32A and distribution bars 32B), and concrete 34. The upper steel plate 20 is the bottom steel plate of the composite deck slab 30 from the viewpoint of a composite deck slab.

The T-shaped reinforcing steel material 22 is a steel material having a T-shaped cross section and having a web 22A and an upper flange 22B, and reinforces the upper steel plate 20. Further, on the upper surface of the upper flange 22B of the T-shaped reinforcing steel member 22, a linear protrusion 22B1 (see FIG. 3) is provided in the width direction of the upper flange 22B, and concrete 34 is poured into the synthetic floor slab 30. Once formed, the T-shaped reinforcing steel material 22 exhibits a strong anti-slip effect with the concrete 34, and the T-shaped reinforcing steel material 22 bears the load as the steel material of the composite deck slab 30.

The reinforcing bars 32 (main reinforcing bars 32A and distribution bars 32B) can be installed at a predetermined position above the upper steel plate 20 after the jacket 12 is installed on the steel pipe pile 80 in the site water area, and the concrete 34 is poured. Although this is normal, if it can be installed in advance at a factory or the like before delivery to the site, it may be done. As shown in FIG. 3, the main reinforcing bars 32A are reinforcing bars arranged parallel to the T-shaped reinforcing steel 22, and the distribution bars 32B are reinforcing bars arranged in a direction perpendicular to the T-shaped reinforcing steel 22.

The jacket structure 10 according to the first embodiment includes a synthetic deck slab 30 in the upper structure. The composite deck slab 30 not only has an upper steel plate 20 integrated with the concrete 34 on the lower surface, but also has a T-shaped reinforcing steel member 22 on the upper surface of the upper steel plate 20, and exhibits a large load bearing capacity. . In addition, as described above, the upper surface of the upper flange 22B of the T-shaped reinforcing steel member 22 is provided with a linear protrusion 22B1 in the width direction, which exerts a strong slip-preventing effect against the concrete 34 and Version 30 exhibits its functions stably. Therefore, in the jacket structure 10 including the synthetic deck slab 30 as the upper structure, the interval between the upper girders 16 that support the synthetic deck slab 30 from below can be increased, and the thickness of the upper steel plate 20 can be increased. By adjusting the thickness of the web 22A and the upper flange 22B of the T-shaped reinforcing steel material 22, the thickness of the concrete 34, etc., the interval between the upper girders 16 can be specifically set to 4 m or more and 12 m or less. can.

Therefore, in the jacket structure 10 according to the first embodiment, the number of upper girders 16 of the jacket 12 is reduced, and as a result, the number of man-hours for assembling the jacket 12 can be reduced. It is also possible to reduce the edge surface.

(1-2) Construction procedure The construction procedure for constructing the jacket structure 10 according to the first embodiment of the present invention will be explained in steps with reference to the drawings.

8 to 14 are diagrams schematically showing typical steps in constructing the jacket structure 10 according to the first embodiment.

<Step S1>
As shown in FIG. 8, of the steel pipe piles 80 to be driven, a preceding steel pipe pile 80A is driven into the ground 200 in advance. For this driving, a general driving method for steel pipe piles may be used.

<Step S2>
The jacket 12 manufactured at the factory is placed on a barge 102, and as shown in FIG. 9, it is towed by a tugboat 104 to the water area at the installation site.

<Step S3>
As shown in FIG. 10, the jacket 12 is hoisted from the barge 102 (see FIG. 9) by a hoist 106, and the jacket 12 is placed so that the leg 14 of the jacket 12 covers the preceding steel pipe pile 80A that was previously driven. . Then, grout (not shown) is filled between the outer circumferential surface of the preceding steel pipe pile 80A and the inner circumferential surface of the leg 14, thereby integrating the preceding steel pipe pile 80A and the leg 14.

Once the installation of the jacket 12 on the preceding steel pipe pile 80A is completed, there is no need to use a work boat including the hoist boat 106 in the subsequent process.

<Step S4>
A steel plate (not shown) is laid on the T-shaped reinforcing steel member 22 of the jacket 12 installed on the preceding steel pipe pile 80A in step S3, and the pile driver 108 is placed on it. Then, as shown in FIG. 11, with the post-cast steel pipe pile 80B inserted into the predetermined leg 14, the post-cast steel pipe pile 80B is driven into the ground 200 by the pile driver 108. After the driving is completed, grout (not shown) is filled between the outer circumferential surface of the post-cast steel pipe pile 80B and the inner circumferential surface of the leg 14 to integrate the post-cast steel pipe pile 80B and the leg 14. .

When the integration of the steel pipe pile 80 and the leg 14 is completed through steps S3 and S4, the installation of the jacket 12 on the steel pipe pile 80 is completed.

<Step S5>
The upper opening of the leg 14 is closed by installing the leg lid 14C, and as shown in FIG. 12, the reinforcing bars 32 (main reinforcing bars 32A and distribution bars 32B) are placed in predetermined positions using the crane 110. . Similarly to step S4, it is also possible to work by laying a steel plate (not shown) on the T-shaped reinforcing steel member 22 of the jacket 12 and placing the crane 110 on it.

<Step S6>
After installing the leg lid 14C and placing the reinforcing bars 32 (main reinforcing bars 32A and distribution bars 32B) at predetermined positions in step S5, as shown in FIG. Then concrete 34 is poured. Similar to steps S4 and S5, it is also possible to lay a steel plate (not shown) on top of the T-shaped reinforcing steel member 22 of the jacket 12, and to place the concrete mixer truck 112 and concrete pump truck 114 thereon.

<Step S7>
When the concrete 34 poured in step S6 is cured for a necessary period and the concrete 34 develops the necessary strength, the formation of the composite slab 30 is completed, and as shown in FIG. 14, the jacket according to the first embodiment is Structure 10 is completed. Thereafter, depending on the mode of use, the upper surface of the synthetic deck slab 30 may be paved, or, for example, a connecting slab 90 may be provided to bridge between it and the quay 300.

(1-3) Modification In the jacket structure 10 according to the first embodiment, as shown in FIG. However, the number of stud dowels in the width direction of the upper flange 16A of the stud dowel 24 is not limited to two, and may be determined as appropriate depending on design conditions, etc., and one in the width direction of the upper flange 16A. However, there may be three or more.

Further, in the jacket structure 10 according to the first embodiment, as shown in FIG. 2, a stud dowel is not provided on the haunch portion 20A at the end of the upper steel plate 20, but a stud dowel is provided on the haunch portion 20A. Alternatively, a stud dowel may be provided at a portion of the upper steel plate 20 other than the haunch portion 20A.

FIG. 15 is a perspective view showing a jacket structure 50 according to a first modification of the jacket structure 10 according to the first embodiment, and a jacket 50A and a synthetic floor slab 50B included in the jacket structure 50. Six stud dowels 24 are provided in the width direction of the upper flange, and a stud dowel 24A is also provided at the haunch portion 20A at the end of the upper steel plate 20.

FIG. 16 is a plan view showing a jacket structure 52 according to a second modification of the jacket structure 10 according to the first embodiment, in which stud dowels 24 are provided in a row on the upper flange of the upper girder 16. , and a stud dowel 24B is also provided on the haunch portion 20A at the end of the upper steel plate 20. In addition, in FIG. 16, the boundary 20X between the haunch portion 20A and the horizontal portion of the upper steel plate 20 is shown by a two-dot chain line, and the concrete 34 is not shown.

(2) Second Embodiment A jacket structure 60 according to a second embodiment of the present invention is an embodiment in which heavy anti-corrosion coating 62 is applied to predetermined areas and an organic zinc rich primer 64 is applied to predetermined areas. . Since points other than these are the same as those in the first embodiment, the description of the first embodiment will be replaced with the description of the jacket structure 60 according to the second embodiment.

FIG. 17 is a vertical sectional view schematically showing the upper girder 16 and its vicinity of the jacket structure 60 according to the second embodiment.

As shown in FIG. 17, in the jacket structure 60 according to the second embodiment, a heavy anti-corrosion coating 62 is provided on the outer surface of the upper girder 16 other than the upper surface of the upper flange 16A and on the lower surface of the upper steel plate 20. ing. Further, an organic zinc-rich primer 64 is applied to the upper surface of the upper flange 16A of the upper girder 16, the upper surface of the upper steel plate 20, the outer surface of the T-shaped reinforcing steel material 22, and the outer surface of the stud dowel 24.

The heavy anti-corrosion coating 62 is an anti-corrosion coating that can prevent corrosion of steel even if the jacket structure 60 is placed in a marine environment. The organic zinc rich primer 64 is applied for a short period of time to the parts of the steel covered with the concrete 34 (the upper surface of the upper flange 16A of the upper girder 16, the upper surface of the upper steel plate 20, the outer surface of the T-shaped reinforcing steel member 22, and the outer surface of the stud dowel 24). plays a role in preventing rapid corrosion.

FIG. 18 is a diagram schematically showing the structure of the heavy anti-corrosion coating 62 provided on the lower surface of the upper steel plate 20.

When providing the heavy anti-corrosion coating 62 on the lower surface of the upper steel plate 20, first, dirt and the like are removed and the surface is adjusted to provide an appropriate surface roughness. Specifically, for example, a blasting process (SIS Sa2.5 or higher) is performed to adjust the base material.

Then, as a first layer, for example, an organic zinc rich primer 64 is applied to a thickness of 20 μm, and as a second layer, for example, an ultra-thick film type epoxy resin coating material 66 is applied to a thickness of 2500 μm. An anticorrosive coating 62 is provided.

The heavy anticorrosive coating 62 (organic zinc rich primer 64 and ultra-thick epoxy resin coating material 66) and organic zinc rich primer 64 used in the jacket structure 60 according to the second embodiment have the necessary performance. As long as it can be ensured, the thickness may be changed as appropriate, and the type of material may also be changed.

(3) Supplement The synthetic floor slab 30 in the jacket structures 10 and 60 according to the first and second embodiments described above has a configuration including the T-shaped reinforcing steel material 22, but the synthetic floor slab that can be used in the present invention The plate is not limited to this configuration, and synthetic floor slabs with different configurations can be used as long as they can solve the problems of the present invention.

Furthermore, as specific examples of the manner in which the upper steel plate 20 is attached to the upper flange 16A of the upper girder 16, the configurations shown in FIGS. However, the present invention is not limited to these, and the attachment mode shown in FIG. 19 may be used, for example.

In this installation mode, the threaded stud 16H welded to the upper surface of the upper flange 16A of the upper girder 16 is inserted through a through hole (not shown) of the presser metal fitting 16J and tightened with a nut 16I. It is attached by pressing down the end of it from above. Therefore, in the attachment mode shown in FIG. 19, it is not necessary to provide a through hole at the end of the upper steel plate 20 or perform welding.

A waterproof seal 16K is provided between the lower surface of the end of the upper steel plate 20 and the upper surface of the upper flange 16A of the upper girder 16 to prevent cement, etc. from leaking from the gap when concrete 34 of the composite slab 30 is poured. I try not to.

Additionally, a filler plate 16L is provided between the lower surface of the presser metal fitting 16J and the upper surface of the upper flange 16A of the upper girder 16, so that the lower surface of the presser metal fitting 16J is parallel to the upper surface of the upper flange 16A of the upper girder 16. Since the upper steel plate 20 can be adjusted stably from above, the end portion of the upper steel plate 20 can be stably pressed down from above.

10, 50, 52, 60... Jacket structure 12, 50A... Jacket 14... Leg 14A, 14B... Connection flange 14C... Leg lid 16... Upper girder 16A... Upper flange 16A1... Screw stud 16A2... High nut 16B... Lower flange 16C , 16H...Threaded stud 16D, 16F, 16I...Nut 16E...Bolt 16G, 16K...Waterproof seal 16J...Holding metal fitting 16L...Filler plate 18...Connection steel 20...Upper steel plate 20A...Haunch portion 20B...Fillet weld 20C...Butt weld ２０ Distribution bar 34...Concrete 40...Cantilever upper girder 42...Outer frame upper girder 62...Heavy duty anti-corrosion coating 64...Organic zinc rich primer 66...Ultra thick film epoxy resin coating material 80...Steel pipe pile 80A...Advanced steel pipe pile 80B ...Post-cast steel pipe pile 90...Connection floor slab 100...Water area 102...Barge 104...Tugboat 106...Hoist boat 108...Pile driver 110...Crane 112...Concrete mixer truck 114...Concrete pump truck 200...Ground 300...Wharf

Claims (10)

Multiple piles driven into the ground of a water body,
A plurality of steel pipe legs each having an inner cavity into which each of the plurality of piles can be inserted, a plurality of upper girders connecting the upper ends of the plurality of steel pipe legs, and welding or mechanical connection to the plurality of upper girders. an upper steel plate that is attached to the upper steel plate and is configured to cover the space between the plurality of upper girders from above, while not covering the inner cavity of the steel pipe leg from above;
A construction method for constructing a jacket structure having
a preliminary pile driving step of previously driving a portion of a plurality of steel pipe piles constituting the jacket structure in the ground of the on-site water area at the construction point;
a transportation step of transporting the jacket constituting the jacket structure to a site water area at a construction point;
a jacket installation step of installing the jacket by placing it so as to cover the upper end of the steel pipe pile previously driven in the preceding pile driving step with a steel pipe leg at a corresponding position of the jacket transported in the transporting step;
a pile driver placement step of placing a pile driver on the jacket;
Among the plurality of steel pipe piles constituting the jacket structure, the remaining steel pipe piles that have not been driven in the preceding pile driving process are placed among the steel pipe legs at corresponding positions in the jacket installed in the jacket installation process. A post-driving pile connecting step in which the pile is driven by the pile driver placed in the pile driver placement step so as to penetrate through the hollow space, and connected to the jacket to support the jacket;
a composite deck slab forming step of forming a composite deck slab by pouring concrete on the upper steel plate of the jacket connected and supported by the steel pipe pile driven in the post -driving pile driving connection step;
A method for constructing a jacket structure, comprising: 2. The method of constructing a jacket structure according to claim 1, wherein the jacket is provided with a reinforcing portion on the upper surface of the upper steel plate for reinforcing the upper steel plate. 3. The method of constructing a jacket structure according to claim 2, wherein the reinforcing portion is integrally formed with the upper steel plate. 4. The method of constructing a jacket structure according to claim 2, wherein the reinforcing part includes a steel member having a T-shaped cross section and arranged with a flange facing upward. 5. The method of constructing a jacket structure according to claim 4, wherein a linear protrusion is provided on the upper surface of the flange portion of the steel material having a T-shaped cross section in the width direction of the flange portion. After the post-driven pile driving and connecting step, grouting is applied between the outer peripheral surface of the steel pipe pile driven in the post-driven pile driving and connecting step and the inner peripheral surface of the steel pipe leg through which the steel pipe pile is inserted. The method for constructing a jacket structure according to any one of claims 1 to 5, further comprising a filling step of filling the jacket structure with. 7. The method for constructing a jacket structure according to claim 6, further comprising a step of closing the upper end of the steel pipe leg with a lid member after the filling step and before the synthetic deck forming step. A claim characterized in that the method further comprises a laying steel plate placement step of placing a laying steel plate on the steel material having a T-shaped cross section, which is the reinforcing portion, before the pile driver placement step or before the composite deck forming step. 5. The method for constructing a jacket structure according to 4 or 5. 9. The method of constructing a jacket structure according to claim 8, wherein the synthetic deck forming step is performed by placing a vehicle for placing the concrete on the laid steel plate. 2. The method of constructing a jacket structure according to claim 1, wherein the synthetic deck forming step is performed by placing a vehicle for placing the concrete on the upper steel plate.

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