JP6575422B2 - Jacket structure - Google Patents

Description

The present invention relates to a jacket type structure, and more particularly to a jacket type structure having a joint structure of a steel pipe pile and a steel outer pipe. Here, the steel pipe pile may be a steel pipe pile, and not only the support pile whose tip reaches a support layer with sufficient support force such as rock mass, but also the tip of the pile with sufficient support force such as rock mass or the like. Friction piles that have not reached a certain supporting layer shall be included. The steel outer pipe is a steel pipe that is arranged so that the inner peripheral surface is spaced from the outer peripheral surface of the steel pipe pile and covers at least a part of the outer peripheral surface of the steel pipe pile. That is.

  As a structure using a joint structure of a steel pipe pile and a steel outer pipe, there is a jacket type structure in which a jacket is supported by a steel pipe pile.

  For example, as shown in FIG. 5, the jacket-type structure 100 includes a jacket 102, a steel pipe pile 112, and a concrete floor slab 114, and a leg 108 of the jacket 102 is inserted into the steel pipe pile 112, and Is provided with a concrete floor slab 114. The jacket 102 has a leg 108 made of a steel pipe projecting below a rating point of a grid-like deck 106 composed of steel girders 104 arranged vertically and horizontally, and a brace material 110 is provided between the legs 108 for reinforcement. It is a structure made. Since the brace material 110 is provided between the legs 108, the interval between the legs 108 can be increased. In the jacket 102, the interval between the legs 108 is set large. . The leg 108 is inserted into the steel pipe pile 112, and a grout material (not shown) is injected between the inner peripheral surface of the leg 108 and the outer peripheral surface of the steel pipe pile 112. They are connected via a grout material.

  Further, for example, as shown in FIG. 6, the jacket-type structure 120 includes a jacket 122, a steel pipe pile 132, and a concrete floor slab 134, and a leg 128 of the jacket 122 is inserted into the steel pipe pile 132. A concrete floor slab 134 is provided above. The jacket 122 has a structure in which a leg 128 made of steel pipe of a predetermined length protrudes below the rating point of a grid-like deck 126 composed of steel girders 124 arranged vertically and horizontally, but no brace material is provided. In the jacket 122, the interval between the legs 128 is set small. The leg 128 is inserted into the steel pipe pile 132, and a grout material (not shown) is injected between the inner peripheral surface of the leg 128 and the outer peripheral surface of the steel pipe pile 132. They are connected via a grout material.

  As described above, in the jacket-type structure 100, a grout material (not shown) is injected between the inner peripheral surface of the leg 108 and the outer peripheral surface of the steel pipe pile 112, and the leg 108 and the steel pipe pile 112. Are connected via a grout material, and in the jacket type structure 120, a grout material (not shown) is injected between the inner peripheral surface of the leg 128 and the outer peripheral surface of the steel pipe pile 132, The leg 128 and the steel pipe pile 132 are connected via a grout material.

  Therefore, the jacket-type structures 100 and 120 are structures using a joining structure of steel pipe piles (steel pipe piles 112 and 132) and steel outer pipes (legs 108 and 128).

  As a technique about the joining structure of a steel pipe pile and a steel outer pipe, Patent Document 1 includes a joining structure of a steel pipe pile and a steel outer pipe arranged at an interval outside the steel pipe pile, A steel plate with outward projections having a plurality of outward projections and fixed to the outer peripheral surface of the steel pipe pile by a first weld; and having a plurality of inward projections and made of the steel by a second weld A plurality of steel plates with inward projections fixed to an inner peripheral surface of an outer tube; and a plurality of grouts filled in the space so as to embed at least the steel plates with outward projections and the steel plates with inward projections. The outward projections are spaced apart from each other in the vertical direction and extend in the circumferential direction of the steel pipe pile; the plurality of inward projections are spaced from each other in the vertical direction, It extends over the circumferential direction of the steel outer tube. Junction structure is described that.

  However, in the joint structure described in Patent Document 1, the steel plate with protrusions is attached to the outer peripheral surface of the steel pipe pile and the inner peripheral surface of the steel outer tube by welding. For this reason, in the joining structure of patent document 1, after cutting a steel plate with a protrusion into required length, it is necessary to bend according to the curvature of a steel pipe, and it takes time.

WO2012 / 118186

This invention is made | formed in view of this point, Comprising: It aims at providing the jacket type | mold structure which has the joining structure of the steel pipe pile and steel outer pipe | tube with favorable workability.

This invention solves the said subject with the following jacket type structures .

That is, the jacket-type structure according to the present invention is arranged such that the steel pipe pile and the inner peripheral surface are arranged with a space between the outer peripheral surface of the steel pipe pile and at least a part of the outer peripheral surface of the steel pipe pile. A jacket-type structure having a steel outer pipe disposed so as to cover the steel pipe , and a protrusion is provided in at least a part of the outer peripheral surface of the steel pipe pile covered with the steel outer pipe. and has the steel outer tube is made and a single protrusion with a steel pipe on the inner peripheral surface inner circumferential surface and one non-protruding steel pipe not provided projections are provided projections, the projections The attached steel pipe is provided on the lower side in the axial direction of the steel outer pipe than the no-projection steel pipe, and the thickness of the no-projection steel pipe is thicker than the thickness of the steel pipe provided with the projection of the protruding steel pipe, In addition, when a reinforcing member that reinforces the connection with the steel beam is welded to the outer peripheral surface of the non-projected steel pipe, The are integrated been welded at the boundary between the non-protruding steel pipe the nubbed steel pipe, the projections of the projection-provided steel pipe is a protrusion provided by rolling, the steel and the outer peripheral surface of the steel pipe pile The jacket-type structure is characterized in that a grout is filled in and integrated with a space between the outer peripheral pipe and the inner peripheral surface.

  In addition, it is considered that whether or not the protrusions of the steel pipe with protrusions are protrusions provided by rolling may be determined by microscopic observation of the metal structure in the region including the protrusions of the steel pipe with protrusions. It is done. However, since the steel sheet that is the raw material of the steel pipe with protrusions (the steel sheet before attaching the protrusions) is usually rolled multiple times, even if a microscopic observation is made on the metal structure in the region including the protrusions, It is considered that the metal structure cannot be said to be a metal structure affected only by rolling for attaching protrusions. For this reason, even if it microscopically observes the metal structure of the area | region containing the processus | protrusion of the steel pipe with a processus, it will be difficult to determine whether the processus | protrusion is the processus | protrusion provided by rolling.

ADVANTAGE OF THE INVENTION According to this invention, in the jacket type structure which has a joining structure of a steel pipe pile and a steel outer tube, the workability of the joining structure can be made favorable.

The vertical sectional view showing joined structure 10 concerning a 1st embodiment of the present invention. The top view which looked at the junction structure 10 which concerns on 1st Embodiment of this invention from upper direction. The vertical sectional view showing joined structure 30 concerning a 2nd embodiment of the present invention. The vertical sectional view showing joined structure 40 concerning a 3rd embodiment of the present invention. Side view showing an example of jacket-type structure Side view showing another example of jacket-type structure

Hereinafter, with reference to drawings, the junction structure of the jacket type structure concerning the embodiment of the present invention is explained in detail. Embodiment described below is a junction structure of a steel pipe pile and a steel outer pipe in a jacket type structure. However, the application target of the joint structure of the jacket type structure according to the present invention is not limited to the jacket type structure, and can be applied to any structure having a joint structure of a steel pipe pile and a steel outer pipe. is there.

(1) First Embodiment FIG. 1 is a vertical sectional view showing a joint structure 10 according to a first embodiment of the present invention. However, for the convenience of illustration, the steel pipe pile 12 is drawn not on a vertical section but on a side surface. FIG. 2 is a plan view of the bonding structure 10 according to the first embodiment of the present invention as viewed from above.

  The joint structure 10 according to the first embodiment of the present invention is a joint structure of a steel pipe pile 12 and a steel outer pipe 14. The steel girder 80 is a structural member of a jacket type structure, and the steel outer tube 14 protrudes as a leg below the rating point of a lattice-shaped deck composed of steel girders 80 arranged vertically and horizontally. A portion where the outer peripheral surface of the steel outer tube 14 is in contact with the steel beam 80 and the reinforcing ring plate 82 is welded, and the steel outer tube 14 is connected to the steel beam 80 and the reinforcing ring plate 82.

  The steel pipe pile 12 is a support pile that has been driven into the ground in the vertical direction and whose tip has reached a support layer having sufficient support force such as a rock mass, and holds the entire position of the jacket-type structure. Have If safety can be confirmed according to conditions such as the weight of the jacket-type structure to be constructed, the steel pipe pile 12 may be a friction pile whose tip does not reach a support layer having sufficient support force such as a rock mass. .

  A steel outer pipe 14 is disposed at the upper end of the steel pipe pile 12 so as to cover the outer peripheral surface thereof. Between the outer peripheral surface of the upper end part of the steel pipe pile 12, and the inner peripheral surface of the steel outer pipe 14, it arrange | positions at intervals. A protrusion 12 </ b> A is provided on the outer peripheral surface of the upper end portion of the steel pipe pile 12. This protrusion 12A is a protrusion provided by rolling, and the material of the protrusion 12A is the same material as other parts of the steel pipe pile 12 (parts other than the protrusion 12A). However, the protrusion 12A may be a protrusion provided by welding. In this case, the material of the protrusion 12A is different from the other part of the steel pipe pile 12 (part other than the protrusion 12A). When providing the projection by welding, it may be a projection made of a weld bead formed of a weld metal that has been melted and solidified, or may be a projection made by attaching a square steel material or a round steel material by fillet welding. . However, the protrusion 12A is preferably a protrusion provided by rolling, because welding for installing the protrusion 12A is not necessary.

  The gap between the outer peripheral surface of the upper end portion of the steel pipe pile 12 and the inner peripheral surface of the steel outer pipe 14 is filled with a grout 24, and the upper end portion of the steel pipe pile 12 and the steel outer pipe 14 are integrated. Has been. The protrusion 12A provided on the outer peripheral surface of the upper end portion of the steel pipe pile 12 serves as a shear key when transmitting the shearing force through the grout 24, and the inner peripheral surface of the upper end portion of the steel pipe pile 12 and the steel outer tube 14 It works to improve the transmission of shearing force to and from the peripheral surface.

  The steel outer tube 14 is a tubular member projecting as a jacket leg (see FIGS. 5 and 6) below the lattice point of a grid-like deck composed of steel girders 80 arranged vertically and horizontally.

  The steel outer pipe 14 includes an upper steel pipe 16, a lower steel pipe 18, and a steel pipe 20 with a protrusion. The upper steel pipe 16 and the lower steel pipe 18 are non-protruding steel pipes having no protrusion on the inner peripheral surface, while the protruding steel pipe 20 is provided with a protrusion 20A over the entire area of the inner peripheral surface.

  The upper steel pipe 16 is disposed above the protruding steel pipe 20, and the lower steel pipe 18 is disposed below the protruding steel pipe 20. The upper end of the steel pipe 20 with protrusions is welded and connected to the lower end of the upper steel pipe 16, and the lower end of the steel pipe 20 with protrusions is welded and connected to the upper end of the lower steel pipe 18. The pipe 14 has a structure in which a protruding steel pipe 20 is sandwiched between an upper steel pipe 16 and a lower steel pipe 18.

  In the steel outer pipe 14, the areas where welding is used are only the boundary area between the upper steel pipe 16 and the protruding steel pipe 20 and the boundary area between the lower steel pipe 18 and the protruding steel pipe 20 (however, the upper side Welding used in manufacturing the steel pipe 16 itself, welding used in manufacturing the lower steel pipe 18 itself, welding used in manufacturing the protruding steel pipe 20 itself, and the steel girder 80 and the reinforcing ring plate 82 Excluding welding for connecting.) Therefore, in the steel outer tube 14, the area where welding is used is small.

  As described above, the steel outer pipe 14 includes the upper steel pipe 16 and the lower steel pipe 18 that are not provided with protrusions on the inner peripheral surface, and the steel pipe 20 with protrusions that are provided with protrusions on the inner peripheral surface. The projecting steel pipe (upper steel pipe 16 and lower steel pipe 18) and the steel pipe with projections (steel pipe with projections 20) have different positions in the axial direction (vertical direction) of the steel outer pipe 14, and the steel pipes with projections and projections are different. At the boundary with the steel pipe (the boundary between the upper steel pipe 16 and the protruding steel pipe 20 and the boundary between the lower steel pipe 18 and the protruding steel pipe 20), welding is performed and integrated.

  The gap between the inner peripheral surface of the steel outer tube 14 and the outer peripheral surface of the upper end portion of the steel pipe pile 12 is filled with a grout 24, and the steel outer tube 14 and the upper end portion of the steel pipe pile 12 are integrated. Has been. The protrusion 20A provided on the inner peripheral surface of the steel pipe 20 with the protrusion of the steel outer pipe 14 functions as a shear key when transmitting the shearing force through the grout 24, and the inner peripheral surface of the steel outer pipe 14 and the steel pipe pile. 12 has a function of improving the transmission of the shearing force between the outer peripheral surfaces of the top ends of the twelve.

  The material of the protrusion 20A provided on the inner peripheral surface of the steel pipe 20 with protrusions of the steel outer tube 14 is the same as the material of other parts of the steel pipe 20 with protrusions. The protrusions 20A are protrusions provided by rolling. Therefore, the material of the protrusions 20A is the same material as other parts of the steel pipe 20 with protrusions (parts other than the protrusions 20A).

  Moreover, since the protrusion 20A provided on the inner peripheral surface of the steel pipe 20 with protrusion used in the present embodiment is a protrusion provided by rolling, welding for installing the protrusion 20A is not necessary. For this reason, in the production of the steel pipe 20 with projections, the production period is shortened and the number of steps is reduced, so that the production cost of the steel pipe 20 with projections can be reduced.

  In addition, it is difficult to provide protrusions on the inner peripheral surface of a steel pipe with a small diameter (about φ800 mm) by welding because the work space is narrow, but the protrusions provided on the inner peripheral surface of the steel pipe with protrusions 20 used in this embodiment. 20A is a protrusion provided by rolling, and welding for installing the protrusion 20A is not required. Therefore, the steel pipe 20 with the protrusion can have a small diameter (about φ800 mm). Further, since welding for installing the protrusions 20A is unnecessary, the steel pipe 20 with protrusions used in this embodiment is less likely to be deteriorated in fatigue characteristics due to residual stress due to welding heat.

  Moreover, since the height of the protrusion provided by rolling is about 2.5-4.0 mm, it is lower than the height (about 6-9 mm) of the protrusion provided by welding. For this reason, in the joint structure 10 according to the first embodiment, the clearance between the inner peripheral surface of the steel outer pipe 14 and the outer peripheral surface of the upper end portion of the steel pipe pile 12 is compared with a case where a protrusion is provided by welding. The large size makes it easy to install locally.

  Reference numeral 22 denotes a stopper. The stopper 22 is made of steel, and is attached to the inner peripheral surface of the upper steel pipe 16 by welding. The lower surface of the stopper 22 is in contact with the upper end surface of the steel pipe pile 12 and has a role of assisting the integration of the upper end portion of the steel pipe pile 12 and the steel outer pipe 14.

  Reference numeral 26 denotes a grout seal. The grout seal 26 has a role of holding the grout 24 until the grout 24 filled in the space between the steel pipe pile 12 and the steel outer pipe 14 is hardened.

  Reference numeral 82 denotes a reinforcing ring plate. The reinforcing ring plate 82 has a role to reinforce the connecting portion between the steel beam 80 and the steel outer tube 14.

  As described above, the joint structure 10 according to the first embodiment of the present invention has a grout at the interval between the steel pipe pile 12 having the protrusion 12A on the outer peripheral surface of the upper end portion and the steel outer pipe 14. 24, and the steel outer pipe 14 has a structure in which a protruding steel pipe 20 having a protrusion 20A on the inner peripheral surface is sandwiched between an upper steel pipe 16 and a lower steel pipe 18 vertically. In the joining structure 10 according to the first embodiment, unlike the joining structure described in Patent Document 1, it is unnecessary to cut and bend the steel plate with protrusions, and the workability is excellent.

  Moreover, in the joining structure 10 which concerns on 1st Embodiment of this invention, the length of the axial direction of the steel pipe 20 with a protrusion is adjusted according to the required joint yield strength between the steel pipe pile 12 and the steel outer pipes 14. Thus, the projecting steel pipe 20 can be used in a necessary minimum amount, so that the material cost can be reduced.

(2) Second Embodiment FIG. 3 is a vertical sectional view showing a joint structure 30 according to a second embodiment of the present invention. However, for the convenience of illustration, the steel pipe pile 12 is drawn not on a vertical section but on a side surface. In addition, about the structure similar to the joining structure 10 which concerns on 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The joining structure 30 according to the second embodiment is a structure in which the protruding steel pipe 34 is further disposed below the lower steel pipe 18 in the joining structure 10 according to the first embodiment, and the upper end portion of the protruding steel pipe 34 is This is an embodiment that is welded and connected to the lower end of the lower steel pipe 18 and that further improves the joint yield strength than the joint structure 10 according to the first embodiment. As shown in FIG. 3, the steel outer pipe 32 used in the joint structure 30 according to the second embodiment includes an upper steel pipe 16, a protruding steel pipe 20, a lower steel pipe 18, and a protruding steel pipe 34 in order from the top. Has been configured.

  Since the protrusion 34A provided on the inner peripheral surface of the steel pipe 34 with protrusions is the same as the protrusion 20A provided on the inner peripheral surface of the steel pipe 20 with protrusions, the description thereof is omitted.

(3) Third Embodiment FIG. 4 is a vertical sectional view showing a joint structure 40 according to a third embodiment of the present invention. However, for the convenience of illustration, the steel pipe pile 12 is drawn not on a vertical section but on a side surface. In addition, about the structure similar to the joining structure 10 which concerns on 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The steel outer pipe 42 used in the joint structure 40 according to the third embodiment includes a leg steel pipe 44 and a steel pipe 46 with a protrusion provided below the leg steel pipe 44. The upper end part of the steel pipe 46 with a projection is welded and connected to the lower end part of the leg steel pipe 44. The leg steel pipe 44 is a non-protruding steel pipe in which no protrusion is provided on the inner peripheral surface.

  In the steel outer pipe 42, the region where welding is used is only the boundary region between the leg steel pipe 44 and the protruding steel pipe 46 (however, the welding used in manufacturing the leg steel pipe 44 itself, the protruding steel pipe). 46 except for the welding used in the manufacture of 46 itself and welding for connecting the steel girder 80 and the reinforcing ring plate 82). Therefore, in the steel outer tube 42 used in the joint structure 40 according to the third embodiment, the area where welding is used is smaller than the steel outer tube 14 used in the joint structure 10 according to the first embodiment.

  In the joint structure 40 according to the third embodiment, the necessary joining strength can be ensured by adjusting the length of the steel pipe 46 with projections.

  Since the protrusions 46A provided on the inner peripheral surface of the steel pipe 46 with protrusions are the same as the protrusions 20A provided on the inner peripheral surface of the steel pipe 20 with protrusions, description thereof is omitted.

DESCRIPTION OF SYMBOLS 10, 30, 40 ... Joining structure 12 ... Steel pipe pile 12A, 20A, 34A, 46A ... Protrusion 14, 32, 42 ... Steel outer pipe 16 ... Upper steel pipe (non-protrusion steel pipe)
18 ... Lower steel pipe (non-projection steel pipe)
20, 34, 46 ... Steel pipe with projection 22 ... Stopper 24 ... Grout 26 ... Grout seal 44 ... Leg steel pipe (non-projection steel pipe)
80 ... Steel girders 82 ... Reinforcement ring plates 100, 120 ... Jacket type structures 102, 122 ... Jackets 104, 124 ... Steel girders 106, 126 ... Deck 108, 128 ... Legs 110 ... Brace materials 112, 132 ... Steel pipe piles 114, 134… Concrete floor slab

Claims (1)

A steel pipe pile, and a steel outer pipe arranged so as to cover at least a part of the outer peripheral face of the steel pipe pile, the inner peripheral face being arranged with a space between the outer peripheral face of the steel pipe pile, and A jacket-type structure having
A protrusion is provided in at least a part of the outer peripheral surface of the steel pipe pile covered with the steel outer pipe,
The steel outer tube is made and a single protrusion with a steel pipe on the inner peripheral surface inner circumferential surface and one non-protruding steel pipe not provided projections are provided projections,
The protruding steel pipe is provided on the lower side in the axial direction of the steel outer pipe than the non-projecting steel pipe,
The thickness of the projection-free steel pipe is thicker than the thickness of the steel pipe provided with the projection of the steel pipe with projection, and a reinforcing member that reinforces the connection with the steel beam is welded to the outer peripheral surface of the projection-free steel pipe. In addition, welding is made at the boundary between the no-projection steel pipe and the projection-provided steel pipe,
The protrusions of the steel pipe with protrusions are protrusions provided by rolling,
A jacket type structure in which a grout is filled and integrated in an interval between an outer peripheral surface of the steel pipe pile and an inner peripheral surface of the steel outer pipe.

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