JP5708982B2 - Leakage prevention structure for filled concrete - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a leakage prevention structure for preventing filling concrete, which is placed to join a steel pipe pile and a steel pipe column at the lower end of a jacket, from leaking into the sea in a steel pipe pile connecting portion of a jacket structure.

  There are three-dimensional grid-like steel pipe truss structures supported by a large number of steel pipe piles, which are called jacket structures, as a foundation for ship mooring facilities, piers, and various offshore structures. When the jacket structure is a large structure, the jacket structure is manufactured in a predetermined block at a factory, transported to an installation position, and the jacket structure as an entire structure is assembled on the ocean.

  That is, each truss-shaped block transported offshore by a crane ship or the like is a steel pipe pile group position previously placed in advance at a predetermined position, and the lower end of the steel pipe pillar constituting the column member of the truss corresponds to the corresponding steel pipe pile. The entire structure of the jacket structure is constructed by connecting the blocks that are joined to the upper end and supported by the steel pipe piles.

  FIG. 1 is a schematic side view showing an example of a jacket structure 10 constructed in the target sea area 1. The jacket structure 10 includes a jacket main body 10A having a three-dimensional truss structure manufactured at a factory and a slab-shaped superstructure 10B constructed on the jacket main body 10A. The jacket structure 10 is predetermined to be supported by the support layer 3 of the seabed ground 2 in advance. It is supported by a plurality of steel pipe piles 20 placed in advance at the position. In general, the steel pipe column 11 and the steel pipe pile 20 of the jacket main body 10A are joined and filled with concrete or mortar between the inner peripheral surface of the steel pipe column 11 and the outer peripheral surface of the steel pipe pile 20 at the connecting portion 5. It becomes.

  7 (a) and 7 (b) focus on the structure of the connecting portion 5 (see FIG. 1) between the steel pipe column 11 of the jacket body 10A and the steel pipe pile 20 previously placed in the conventional jacket structure. It is a partial expanded sectional view. FIG. 7A shows an example of a leak prevention structure for filled concrete using the leak prevention sheet 101. In this conventional example, a lower end 11a of a steel pipe column 11 of a three-dimensional truss of a jacket structure 10 and a peripheral surface 20a of a steel pipe pile 20 are covered with a leakage prevention sheet 101 made of synthetic resin, and the leakage prevention sheet 101 is covered with a band. Filled concrete 15 for filling is placed in the gap 6 between the outer peripheral surface of the steel pipe column 11 and the inner peripheral surface of the steel pipe pile 20 in a state of being bound to the steel pipe pile 20 and the steel pipe column 11 (not shown). Integrated.

  FIG. 7 (b) shows another conventional example in which the contact plate 102 is attached to the lower end 11 a of the steel pipe column 11 in the connecting portion 5, and leakage of the filled concrete 15 from the gap 6 between the steel pipe column 11 and the steel pipe pile 20 is prevented. The structure to prevent is shown. This abutting plate 102 is welded to the peripheral surface 20a of the steel pipe pile 20 in the sea, and further welded in the state where the lower end 11a of the steel pipe column 11 is placed on the abutting plate 102 in the sea. 15 is cast.

  As described above, in the jacket structure, when the steel pipe column of the jacket body and the steel pipe pile placed in advance are connected, the concrete or mortar is placed in the gap between the inner peripheral surface of the steel pipe column and the outer peripheral surface of the steel pipe pile. In general, they are filled, joined and integrated.

  In addition, as a similar technique, the applicant applies a mortar to the column joint to connect the upper and lower columns as a method of joining the lower and upper columns in a steel structure building without welding. A method for joining steel pipe columns has been proposed (see Patent Document 1). In this invention, the internal column corresponds to the steel pipe pile, the upper joint column corresponds to the steel pipe column, and the upper and lower columns (steel pipe) are joined by filling the gap with mortar and joining the two. Have.

JP 2006-322276 A

  When the leakage prevention structure shown in FIG. 7A is adopted, considering the strength of the leakage prevention sheet 101 on which the weight of the concrete acts, the filled concrete 15 is cast and solidified at a height of about 1 m from the lower end. After that, it is preferable to cast the filling concrete 15 on the upper part thereof. Therefore, depending on the height (length) of the gap, it is necessary to place the filled concrete 15 in two or more times, which increases the construction period of the filled concrete and increases the construction cost. is there.

  When the leakage prevention structure shown in FIG. 7B is adopted, it is necessary to weld the steel pipe column 11 and the contact plate 102 in the sea. In the case of stormy weather, the welding work becomes difficult and the work is delayed. There is a problem.

  In the joining method disclosed in Patent Document 1, the upper and lower columnar columns have the same outer diameter, and even when a ring plate is disposed, the upper and lower columns can be in close contact with each other. In addition, since the lower end of the inner column is also metal-touched to the lower node column, the mortar-filled joint has a structure that does not require any special means for preventing leakage of the mortar.

  The present invention has been made to solve the above-described problems, and in particular, filled concrete in a joint portion of a jacket structure, which can surely prevent leakage of concrete to be filled and can be quickly joined. An object of the present invention is to provide a leakage prevention structure.

The leakage prevention structure for filled concrete according to the present invention covers the head of a pile placed in advance so as to be supported by the seabed ground by providing a predetermined overlap, and the concrete filled in the gap with the pile is A structure for preventing leakage of filled concrete in an offshore steel structure provided with a steel pipe column joined to a pile, wherein a ring-shaped seal support member having an inner peripheral edge fixed to the outer peripheral surface of the pile, and the steel pipe column the inner peripheral surface provided above the seal supporting member so that the outer peripheral edge is supported, a central opening and a ring-shaped elastic sealing plate that the pile is penetrated, the elastic sealing plate, the inner part of the peripheral edge is elastically deformed into a substantially U-shaped with close contact with pile penetrating the central opening to prevent leakage of the concrete, the seal support member, the elastic seal striking設時of the concrete Abbreviated U-shape of board It holds Jo site from below, characterized in that to prevent subsequent deformation progresses.

According to another aspect of the present invention, there is provided a structure for preventing leakage of filled concrete, in which the head of a pile placed in advance so as to be supported by the seabed ground is covered with a predetermined overlap, and the concrete is filled in a gap with the pile. The structure for preventing leakage of filled concrete in an offshore steel structure having a steel pipe column joined to the pile by means of a central opening smaller than the outer diameter of the pile is fixedly supported on the inner peripheral surface of the steel pipe column. A ring-shaped seal support member having a diameter, a part of the inner periphery being cut for penetrating the pile, and being fixed on the seal support member, having a central opening diameter smaller than the outer diameter of the pile, and a ring-shaped elastic sealing plate with the central opening the pile therethrough, the elastic sealing plate, said in close contact with the pile portion of the inner peripheral edge side penetrates the central opening elastically deformed Prevent leakage of concrete and Le support member when said piles extending through the central opening, a portion of the internal peripheral edge shaped to ensure the penetration path of the pile is cut off, pouring of the concrete ring shaped region of the residual The elastic seal plate sometimes holds a portion other than the portion in close contact with the pile and suppresses subsequent deformation progress.

  It is preferable to provide a spacer that forms a gap with the pile and secures a space for placing the concrete on the inner peripheral surface of the steel pipe column.

  ADVANTAGE OF THE INVENTION According to this invention, it can prevent reliably that the concrete with which the clearance gap between the steel pipe pile as a foundation and the steel pipe pillar of the jacket as a marine structure leaks is leaked, and the steel pipe pile and steel pipe pillar in a connection part. There exists an effect that a connection can be constructed in a short period of time.

The schematic whole structure figure which showed an example of the jacket structure to which the leakage prevention structure of the filling concrete of this invention was applied. Sectional drawing which showed the leakage prevention structure of the filling concrete which concerns on the 1st Embodiment of this invention. Sectional drawing which showed the leakage prevention structure of the filling concrete which concerns on the 1st Embodiment of this invention, and its construction procedure ((a)-(b)). It is sectional drawing to which (IV) in FIG. 3 was expanded, (a) is sectional drawing before concrete placement, (b) is sectional drawing after concrete placement. Sectional drawing which showed the leakage prevention structure of the filling concrete which concerns on the 2nd Embodiment of this invention, and its construction procedure ((a)-(c)). It is sectional drawing to which (VI) in FIG. 5 was expanded, (a) is sectional drawing before concrete placement, (b) is sectional drawing after concrete placement. (A), (b) is sectional drawing of the conventional jacket structure which paid its attention to the connection part of a jacket main body and a pile.

  A leakage prevention structure for filled concrete according to an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 2 is an enlarged cross-sectional view of the connecting portion 5 of the jacket structure 10 shown in FIG. 1 as the first embodiment.

  As shown in the figure, the leak prevention part 30 of the filled concrete provided at the lower end of the connecting part 5 includes the seal support member 12 attached along the outer peripheral surface of the steel pipe pile 20 and the inner periphery of the steel pipe column 11. The seal plate 13 is attached to the surface via a fixing member 17.

  The seal support member 12 is made of a steel plate cut into a ring shape having an inner diameter substantially equal to the outer diameter of the steel pipe pile 20 and a width slightly smaller than the gap 6. And it welds to the predetermined | prescribed height of the outer periphery of the steel pipe pile 20 so that it may make a bowl shape with respect to the outer peripheral surface of the steel pipe pile 20. The seal support member 12 is attached to the outer peripheral surface of the steel pipe pile 20 having a height of H1 m from the upper end. Then, as will be described later, the seal plate 13 deformed by the concrete weight generated when the filled concrete 15 placed in the gap 6 is not yet solidified is supported on the upper surface thereof.

  For example, a chloroprene rubber-based synthetic rubber is used for the seal plate 13. The seal plate 13 is formed in a ring shape having a predetermined width, and in an unstressed state, the outer diameter is substantially equal to the inner diameter of the steel pipe column 11 and the inner diameter is smaller than the outer diameter of the steel pipe pile 20. A support plate 16 (FIG. 4) is attached to the inner peripheral surface of the steel pipe column 11, and the seal plate 13 is fixed to the support plate 16 with bolts 17.

  For the steel pipe pile 20 and the steel pipe column 11, a processed steel pipe obtained by bending a ready-made steel pipe or a steel plate into a tubular shape and welding its joint is used. The diameter dimension is set to a dimensional relationship such that the steel pipe pillar 11 can be fixed by the filled concrete in a state where the lower end of the steel pipe column 11 is inserted with a predetermined gap 6 into the upper end of the steel pipe pile 20 that has been previously placed. .

  And as shown in FIG. 2, the filling concrete 15 is constructed between the steel pipe pile 20 and the steel pipe pillar 11. As shown in FIG. The steel pipe pile 20 and the steel pipe column 11 are integrated by the adhesive force of this filling concrete. Further, even when a shearing force or the like acts on the connecting portion 5 during service, the filled concrete resists and the connected state of the connecting portion is maintained. As the filling concrete 15, concrete having a strength necessary for maintaining a connected state may be used.

  FIG. 3 is a cross-sectional view showing an assembling procedure (FIGS. 3A and 3B) of the connecting portion 5 shown in FIG. 2 and a form after assembly ((c)). As shown in FIG. 3 (a), the steel pipe pile 20 is previously placed at a predetermined position on the seabed ground. With respect to this steel pipe pile 20, as shown by the downward arrow in the figure, the steel pipe column 11 of the jacket body 10 (FIG. 2) suspended by a crane or the like not shown is lowered, and the lower end thereof is the upper end of the steel pipe pile 20. Insert into. In addition, in the no-stress state, the diameter of the opening 13c of the seal plate 13 is smaller than the outer diameter of the steel pipe pile 20. Therefore, the steel pipe pile 20 is inserted so that the seal plate 13 is elastically deformed and expands the opening 13c formed in the center portion, and the entire circumference of the steel pipe pile 20 and the opening 13c on the bottom surface side 13a of the seal plate 13 are inserted. Is in close contact with the predetermined range.

  FIG.3 (b) has shown the state which the insertion to the steel pipe pillar 11 of the steel pipe pile 20 was completed. A level adjusting unit 18 is attached to a position corresponding to the upper end of the steel pipe pile 20 on the inner peripheral surface of the steel pipe column 11. The level adjusting unit 18 is a member that contacts the upper end of the steel pipe pile 20 and adjusts the posture of the jacket body 10. The level adjusting unit 18 is made of, for example, an L-shaped steel piece having a predetermined length, and when the steel pipe pile 20 is placed with an inclination within an allowable range, the inclination is taken into consideration and the inclination is cancelled. By attaching the main body (not shown) to the inner peripheral surface of the steel pipe column 11 so as to be horizontal, or by inserting a liner plate (not shown) between the level adjuster 18 and the top end of the steel pipe pile 20, The horizontal state of the steel pipe column 11 at the connecting portion 5 can be adjusted. Moreover, the spacer 14 is attached to the inner peripheral surface of the steel pipe pillar 11, and the clearance gap 6 between the steel pipe pile 20 and the steel pipe pillar 11 is ensured equally.

  FIG. 4 is an enlarged cross-sectional view of the filled concrete leakage prevention portion 30 in the broken line range (IV) shown in FIG. 3. FIG. 4A shows a state before filling concrete is placed, and FIG. 4B shows a state after filling concrete is placed. As shown in FIG. 4A, the bottom surface 13 a is in close contact with the outer peripheral surface of the steel pipe pile 20 in a state where the seal plate 13 is forcibly bent upward. The thickness of the synthetic rubber material of the seal plate 13 is set to a suitable thickness that allows the opening side of the seal plate 13 to be sufficiently deformed and be in close contact with the steel pipe pile 20 when the seal plate 13 is deformed according to the distance C of the gap 6. It is preferable to set.

  From the state of FIG. 4A, the filled concrete 15 is filled into the gap 6 between the steel pipe column 11 and the steel pipe pile 20. The seal plate 13 is pressed downward by the dead weight of the uncured concrete placed in the gap 6, and the intermediate position is U when viewed from the side while maintaining the close contact with the steel pipe pile 20. Elastically deforms to form a letter shape. The elastically deformed seal plate 13 is in contact with the seal support member 12 of the steel pipe pile 20, as shown in FIG. 4B, while the bottom face side 13 a is in close contact with the steel pipe pile 20. Therefore, even if the concrete is cast in the gap 6 and the weight increases further, the seal plate 13 hardly deforms beyond this deformed state.

  The leakage prevention unit 30 described above has the following effects. When the steel pipe pile 20 is joined to the steel pipe column 11, the opening 13 c side of the seal plate 13 slides on the steel pipe pile 20 and elastically deforms. Therefore, the tight contact state between the steel pipe pile 20 and the seal plate 13 can be strengthened. Thereby, the leakage of the filling concrete 15 cast in the gap between the steel pipe pile 20 and the steel pipe column 11 can be reliably prevented.

  Moreover, in the leakage prevention part 30 of this embodiment, the inner diameter of the ring-shaped seal plate 13 is made smaller than the outer diameter of the steel pipe pile 20, and a predetermined amount of contact area between the seal plate 13 and the steel pipe pile 20 is secured. . Therefore, for example, even when the upper end of the steel pipe pile 20 is eccentrically constructed from the center of the pile and the pile center of the steel pipe pile 20 is displaced from the column center at the installation position of the steel pipe column 11, the deviation is used as the seal plate 13. Therefore, the close contact between the sealing plate 13 and the steel pipe pile 20 is reliably maintained.

  Further, the seal plate 13 that is elastically deformed so as to form a U shape by the weight of the filled concrete 15 is supported by the seal support member 12 of the steel pipe pile 20. Therefore, leakage of the filled concrete 15 can be prevented even if the load due to the weight of the filled concrete 15 is large. Therefore, it is possible to construct a predetermined amount of filled concrete 15 at a time, and the construction period can be shortened.

  In addition, since the seal plate 13 and the seal support member 12 are attached at predetermined positions in the factory in advance, basically no installation work is required in the sea. Therefore, the joining work of the steel pipe pillar 11 and the steel pipe pile 20 can be performed efficiently, and the construction period can be shortened and the construction cost can be reduced.

  In the leakage prevention unit 30 described above, the seal support member is a ring-shaped member. However, for example, even if seal support members made of pieces of a predetermined length are arranged on the inner peripheral surface of the steel pipe column 11 at equal intervals. Good.

  Next, the leakage prevention structure for filled concrete according to the second embodiment of the present invention will be described. FIG. 5: is sectional drawing which showed the leak prevention structure of the filling concrete which concerns on the 2nd Embodiment of this invention, and its construction procedure ((a)-(c)). Note that, among the constituent members of the filled concrete leakage prevention structure of the present embodiment, the same members as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment.

  Unlike the structure of 1st Embodiment mentioned above, the leak prevention part 30 (refer each figure of FIG. 6) of this embodiment has the seal support member 12 attached to the internal peripheral surface of the steel pipe pillar 11. FIG. The seal support member 12 is made of a ring-shaped steel plate, and the outer edge is welded to the inner peripheral surface of the steel pipe column 11. The inner diameter of the seal support member 12 is smaller than the outer diameter of the steel pipe pile 20, and as will be described later, a cutting margin 12a (FIG. 5 (b)) for cutting reflecting the construction error of the steel pipe pile 20 is provided. .

  As in the first embodiment, the seal plate 13 is a ring-shaped chloroprene rubber-based synthetic rubber plate. The outer diameter of the seal plate 13 is substantially equal to the inner diameter of the steel pipe column 11, and the inner diameter is smaller than the outer diameter of the steel pipe pile 20. The seal plate 13 is placed on the seal support member 12 and fixed to the seal support member 12 with bolts 17 (FIG. 5A).

  In addition, the steel pipe pile 20 that has been placed in advance has a construction error within an allowable range such as a vertical degree and a pile center position. Even in such a case, the steel pipe column 11 that supports the jacket body 10 (FIG. 2) needs to be installed at the design position with high accuracy without being affected by the construction error of these steel pipe piles 20. is there. In this embodiment, the error dimension from the design position of the steel pipe pile 20 in the connection part 5 is measured, and the predetermined range on the inner edge side of the seal support member 12 in the range through which the steel pipe pile 20 is inserted is cut (FIG. 5B). Cut off 12a). For example, when the steel pipe pile 20 is tilted and constructed, the seal support member 12 cuts the margin 12a into an oval shape. Thereby, the steel pipe column 11 can be joined at the design position without being affected by the construction error generated in the steel pipe pile 20.

  Then, the steel pipe pile 20 is accommodated in the steel pipe pillar 11, and as shown in FIG.5 (c), the level adjustment member 18 is made to contact | abut on the top end of the steel pipe pile 20, and the steel pipe pillar 11 and the steel pipe pile are made. 20 is a predetermined positional relationship.

  6 is a cross-sectional view showing the leakage prevention portion 30 by enlarging the broken line range (VI) in FIG. 5, (a) is a cross-sectional view before placing concrete, and (b) is a cross-sectional view after placing concrete. Is shown. As shown in FIG. 6A, as in the first embodiment, also in the leakage preventing portion 30, the seal plate 13 is directed upward and is in close contact with the outer surface of the steel pipe pile 20.

  From the installation state shown in FIG. 6A, the filling concrete 15 is filled into the gap 6 between the steel pipe column 11 and the steel pipe pile 20. The seal plate 13 is pushed downward by the filled concrete, but as shown in FIG. 6B, the seal plate 13 comes into contact with the seal support member 12 to suppress further deformation (see FIG. 6). 6 (b)). Thus, the seal support member 12 has a function of supporting the seal plate 13 pushed downward by the filled concrete 15. In order to maintain the seal plate 13 with such a function, the seal support member 12 is set so that the distance d of the gap 19 between the steel pipe pile 20 and the seal support member 12 is smaller than twice the thickness t of the seal plate 13. It is preferable to cut (FIG. 6A). Thereby, it is possible to prevent the seal plate 13 from coming out of the gap between the steel pipe pile 20 and the seal support member 12.

  In addition, the leak prevention structure of the filling concrete of this invention is not limited to two embodiment mentioned above, The various change within the range shown to each claim is possible. In other words, embodiments obtained by combining technical means appropriately changed within the scope of the claims are also included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Jacket body 11 Steel pipe pillar 12 Seal support member 12a Cutting margin 13 Seal plate 14 Spacer 15 Filling concrete 17 Bolt 18 Level adjustment part 20 Steel pipe pile 30 Leak prevention part

Claims (3)

An offshore equipped with a steel pipe column that covers the head of a pile that has been placed in advance so as to be supported by the seabed ground with a predetermined overlap and is joined to the pile by concrete filled in a gap with the pile. A structure for preventing leakage of filled concrete in a steel structure,
A ring-shaped seal support member having an inner peripheral edge fixed to the outer peripheral surface of the pile;
Outer peripheral edge provided above the seal support member so as to be supported on the inner peripheral surface of the tubular columns, a central opening is the pile and a ring-shaped elastic sealing plate which penetrates,
The elastic sealing plate is elastically deformed into a substantially U-shaped with close contact with pile part of the inner peripheral edge side penetrates the central opening and preventing leakage of the concrete, the seal support member, said concrete A structure for preventing leakage of filled concrete, characterized in that a substantially U-shaped portion of the elastic seal plate is held from below when the elastic sealing plate is placed and the subsequent deformation is suppressed. An offshore equipped with a steel pipe column that covers the head of a pile that has been placed in advance so as to be supported by the seabed ground with a predetermined overlap and is joined to the pile by concrete filled in a gap with the pile. A structure for preventing leakage of filled concrete in a steel structure,
A ring-shaped seal support member that is fixedly supported on the inner peripheral surface of the steel pipe column, has a center opening diameter that is smaller than the outer diameter of the pile at the beginning, and a part of the inner peripheral edge is cut to penetrate the pile ,
A ring-shaped elastic seal plate fixed on the seal support member, having a central opening diameter smaller than the outer diameter of the pile, and through which the pile penetrates the central opening;
The elastic sealing plate is in close contact with the pile portion of the inner peripheral edge side penetrates the central opening elastically deformed to prevent leakage of the concrete, the seal support member, the pile is the central opening A part of the inner peripheral edge side is cut and removed in a shape that secures a penetration path of the pile when penetrating the pile, and the elastic seal plate is in close contact with the pile at the time of placing the concrete in the remaining ring-shaped part A structure for preventing leakage of filled concrete, characterized in that it keeps other than that and suppresses subsequent deformation. The inner peripheral surface of the steel pipe column forms a gap between the piles, according to claim 1 or claim 2, characterized in that the spacer to secure a space for pouring the concrete is provided Leakage prevention structure for filled concrete.

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