JP4896086B2 - Attaching the precast member - Google Patents

Description

  The present invention relates to a method for attaching a precast member to a water structure such as a quay, a caisson or a pier for mooring a ship, and a precast member used for the method.

  Conventionally, it is known to attach a fender to a floating structure such as a quay, a caisson, a pier, etc., in order to alleviate an impact when a ship is in contact (see Patent Documents 1-3).

  Since this fender is placed adjacent to the water surface, it is attached by a diver.

In addition, as disclosed in these patent documents, there is known a method using a precast member to efficiently construct a high-quality structure by reducing work on water with poor construction conditions. .
Japanese Patent Laid-Open No. 3-100217 Japanese Patent Laid-Open No. 2007-32003 JP-A-9-137424

  When the precast member is used in this way, the work at the site can be reduced, but there remains a problem of how to quickly integrate the main body structure and the precast member.

  In particular, when a precast member is attached to the lower surface side of a water structure, it is easily affected by waves and the like, and therefore, it is desired to develop a method that can be quickly and reliably fixed.

  Therefore, an object of the present invention is to provide a method for attaching a precast member capable of quickly and reliably fixing the precast member to the lower surface side of the floating structure, and a precast member used therefor.

  In order to achieve the above object, a precast member mounting method according to the present invention is a precast member mounting method in which a precast member is mounted on the lower surface side of a floating structure overhanging water. A floating structure in which a through hole through which the PC steel rod is inserted and an opening through which the suspension wire is inserted are formed over the water in parallel with or before or after the step of manufacturing the member. , A step of suspending the precast member with a suspension wire inserted through the opening in a state where the PC steel rod protrudes upward, and lifting the precast member to the PC hole in the through hole A step of inserting a rod; and a step of tensioning the PC steel rod to join the precast member and the overhanging portion. That.

  Here, in the step of suspending the precast member, in a state where the precast member is suspended by the first crane, the suspension wire of the second crane is inserted through the opening and connected to the precast member, The load can be transferred to the suspension wire of the second crane and suspended.

  Further, in the step of joining the precast member and the overhang portion, the upper surface of the precast member and the lower surface of the overhang portion may be joined via an adhesive.

  Further, in the step of joining the precast member and the overhanging portion, the upper surface of the precast member and the lower surface of the overhanging portion may be joined via an uneven fitting.

  Further, in the step of joining the precast member and the overhang portion, a filler can be filled in a gap between the through hole and the PC steel rod.

  And the said precast member can use the member by which the fender was attached to one side.

  Moreover, the precast member of the present invention is a precast member that is attached to the lower surface side of a floating structure overhanging the water, and is a wall portion formed of concrete and PC steel protruding from the upper surface of the wall portion. A rod and a fender attached to one side surface of the wall portion are provided.

  The precast member mounting method of the present invention thus configured uses a precast member from which a PC steel bar protrudes, and the PC steel bar is inserted from below into a through hole provided in the overhanging portion of the water structure. And a precast member is joined to the lower surface side of an overhang | projection part by tensioning a PC steel stick.

  For this reason, a precast member can be fixed to the undersurface side of a floating structure quickly and reliably. Further, since the alignment is performed by the PC steel rod and the through hole, the precast member can be attached at an accurate position.

  Furthermore, by providing an opening through which the suspension wire is inserted in addition to the through-hole, the precast member is suspended using the opening so that the PC steel rod is located directly under the through-hole. Can be joined quickly.

  Moreover, if it is the method of transferring a load using two cranes, position alignment can be performed easily.

  Furthermore, a precast member and an overhang | projection part can be joined more firmly by using an adhesive agent together. Moreover, a shear resistance can be raised by joining through uneven | corrugated fitting.

  Moreover, anticorrosion performance can be improved by filling a filler with the filler in the clearance between the through hole and the PC steel rod.

  Furthermore, if the fender is a precast member attached to the side surface, the fender is also placed at a predetermined position simply by attaching the precast member, so that the work is performed by a diver to attach the fender later. Can be omitted.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 is a cross-sectional view illustrating a process of attaching a fender wall 2 as a precast member according to the present embodiment to a lower surface side 11a of a jetty 1 as a floating structure, and FIG. It is a top view explaining the process of attaching the wall.

  First, the pier 1 will be described. The pier 1 is mainly composed of a pile 13 such as a steel pipe pile protruding from the water surface W and a slab 11 supported by the pile 13.

  The slab 11 is a plate-like member constructed of reinforced concrete, prestressed concrete, and the like. The lower surface side 11a is formed in a beam shape, and an overhanging portion 12 is formed on the water surface W outside the pile 13. Has been.

  The overhanging portion 12 is provided with a plurality of holes penetrating from the upper surface side 11b to the lower surface side 11a. Some of these holes are through-holes 14 through which PC steel rods 22 to be described later are inserted, and the rest are openings 15 and 15 through which the suspension wires 321 are inserted. That is, the PC steel rods 22... Of the fender wall 2 are inserted through the through holes 14.

  The fender wall 2 includes a wall portion 21 formed of reinforced concrete and the like, a plurality of PC steel rods 22 projecting from the upper surface thereof, and a truncated quadrangular pyramid projecting upward from the upper surface. It is mainly comprised from the shape convex part 23 and the fender 24 attached to the one side of the wall part 21. As shown in FIG.

  The fender 24 is a buffer material that receives an external force when the ship is brought into contact with the ship, and is formed of rubber, laminated rubber, a tire cord, or the like. Moreover, it fixes to the wall part 21 with the volt | bolt 24a.

  Further, on the upper surface of the wall portion 21, suspension fittings 25 and 25 for connecting the suspension wire 311 of the first crane 31 are mounted. Further, suspension metal fittings 26 and 26 for connecting the suspension wire 321 of the second crane 32 are mounted on both side surfaces orthogonal to the surface of the wall portion 21 to which the fender 24 is attached. Here, the hanging metal fittings 25 and 25 attached to the upper surface of the wall portion 21 are configured to be detachable so that they can be removed after use. However, the hanging metal fittings 26 and 26 provided on the side surfaces are embedded even if they are detachable. It may be either.

  Further, when the fender metal walls 2 are suspended by the suspension wires 321 and 321, the suspension metal fittings 26 and 26 are such that the upper surface of the wall portion 21 becomes horizontal and the PC steel rods 22,. It attaches according to the position of the suspension gravity center of the fender wall 2 so that it may extend.

  On the other hand, as for PC steel rod 22, ..., the lower half part is embed | buried under the wall part 21, and the upper half part protrudes upwards. The number of the PC steel bars 22,... Can be arbitrarily set according to the load acting on the fender wall 2 and the desired bonding strength.

  As shown in FIGS. 1 and 2, the outer diameter of the PC steel rods 22,... A through hole 14 with a large inner diameter is provided.

  Moreover, the opening parts 15 and 15 are provided in the position just above the suspension metal fittings 26 and 26 arrange | positioned when the PC steel rods 22 and the like are inserted through the through holes 14 and the like. By providing the through holes 14,... And the openings 15 and 15 in such a positional relationship, if the suspension wires 321 and 321 suspended from the openings 15 and 15 are lifted directly above, the through holes are naturally formed. 14,... Are inserted with PC steel rods 22.

  Next, a method for attaching the fender wall 2 according to the present embodiment will be described.

  First, the fender wall 2 as the precast member described above is manufactured in a factory or a manufacturing yard. The fender wall 2 is formed of a reinforced concrete formed with a wall portion 21 from which the PC steel rods 22,... Are projected and reaches a predetermined strength. Are fixed by bolts 24a,.

  Further, the pier 1 and its overhanging portion 12 are constructed in parallel with or before and after the production of the fender wall 2. Here, in the overhanging portion 12, through holes 14,... And openings 15, 15 are provided in accordance with the position where the fender wall 2 is attached.

  In addition, two cranes 31 and 32 are installed on the slab 11 of the pier 1 as shown in FIG. These cranes 31, 32 are suspended from booms 314, 324, wires 313, 323 suspended and hung from the tip, hooks 312, 322 provided at the lower end, and hooks 312, 322. The suspension wires 311 and 321 are provided respectively.

  Furthermore, a scaffold 4 (see FIG. 7) that sandwiches a place where the fender wall 2 is installed from both sides is installed using a crane 31. In FIGS. 1 to 6, the scaffold 4 is not shown because it interferes with other explanations. This scaffold 4 is bonded to the joint surface of the fender wall 2, auxiliary work when inserting the PC steel rods 22,... Into the through-holes 14,. It is used as a working scaffold in the operation of applying a chemical agent, the surface treatment of the joint, and the like.

  Then, the fender walls 2... Manufactured at the factory according to the number of attachments are carried onto the slab 11, and the hanger wires 311 suspended from the first crane 31 are carried into the fender walls 2. Are connected to the hanging brackets 25, 25.

  Here, when the posture of the fender wall 2 is not the direction as shown in FIG. 1, the fender wall 2 is changed so that the PC steel rods 22,. lift.

  The fender wall 2 is initially lifted by the first crane 31 and moved laterally to the water surface W outside the overhanging portion 12 as shown in FIGS. Subsequently, the wire 313 is wound down to a position where the upper ends of the PC steel bars 22,... Do not collide with the lower surface side 11 a of the slab 11.

  On the other hand, the suspension wire 321 of the second crane 32 is inserted into each of the openings 15 and 15 so that the lower end of the suspension wire 321 protrudes downward from the lower surface side 11a as shown in FIG.

  Then, the operator disposed on the scaffold 4 (see FIG. 7) connects the lower end of the suspension wire 321 to the suspension fitting 26 of the fender wall 2 as shown in FIG. FIG. 4 is a front view showing a state in which the fender wall 2 is suspended by the two cranes 31 and 32 as described above.

  FIG. 5 is an explanatory diagram for explaining the work of suspending from the first crane 31 to the second crane 32. Before the suspension is changed, all the loads on the fender wall 2 are supported by the suspension wire 311 of the first crane 31.

  When the suspension is changed, the wire 313 of the crane 31 is lowered and the wire 323 of the second crane 32 is wound up. Then, the fender wall 2 moves laterally directly below the opening 15 and the load on the fender wall 2 gradually moves from the crane 31 to the crane 32.

When the hanger 26 on the side surface of the fender wall 2 is moved to the position just below the opening 15 in this way, the hanger wire 321 hangs vertically, and in this state, the first crane 31 The suspension wire 311 is removed from the suspension fitting 25, and the suspension fittings 25, 25 protruding from the upper surface of the wall portion 21 are removed. Moreover, since the upper surface of this wall part 21 becomes a joining surface, it cleans and apply | coats an adhesive agent. As this adhesive, for example, a high-strength adhesive having a compressive strength after curing of 60 N / mm ² or more can be used.

  And as shown in FIG. 6, the wire 323 of the 2nd crane 32 is wound up and the fender wall 2 is lifted. Here, the PC steel of the fender wall 2 suspended from the planar position of the through-holes 14,... Provided adjacent to the opening 15 and the suspension wire 321 suspended vertically from the opening 15. Since the planar positions of the bars 22, ... are aligned, when the fender wall 2 is lifted directly above, the PC steel bars 22, ... are inserted into the through holes 14, ..., respectively. Will be. During the work, since the waves are swayed by the waves, the insertion work is performed while fine adjustment is performed with the assistance of the worker in the scaffold 4.

  Further, when the wall 21 is lifted up until the upper surface of the wall 21 comes into contact with the lower surface side 11a of the slab 11, the convex portion 23 protruding from the upper surface of the wall portion 21 fits into the concave portion 16 provided on the lower surface side 11a. A fit is formed.

  In this way, fixing tools 22a,... Composed of bearing plates and nuts are attached to the upper ends of the PC steel bars 22,. The wire 321 is removed from the hook 322.

  Then, as shown in FIG. 7, the tension jack 5 is attached to the upper end of the PC steel bar 22 from above the fixing tool 22a.

  This PC steel bar 22 is introduced with a tensioning force by the tension jack 5 in order to each PC steel bar 22,. In this way, when the design tension force is introduced to all the PC steel bars 22,... And fixed by the fixing tools 22 a,..., The fender wall 2 and the overhanging portion 12 are integrated. It will be.

  Since this tensioning work is performed before the adhesive applied to the joint surface is cured, the adhesive may leak to the surface of the boundary between the fender wall 2 and the overhanging portion 12, and such leakage may occur. The adhesive is surface treated by removing or leveling the adhesive.

  Further, an injection hose 14a as shown in FIG. 8 is connected to the lower portion of the through hole 14 in advance, and a non-shrink grout as a filler is provided from the injection hose 14a to a gap between the through hole 14 and the PC steel rod 22. Fill. Although not shown, there is a gap between the upper end of the through hole 14 and the fixing tool 22a, and air is released from the gap, so that the non-shrink grout can be filled in the through hole 14. After the work is finished, the scaffold 4 that is no longer needed is removed and reused at a place where another fender wall 2 is attached.

  Next, the effect | action of the attachment method of the fender wall 2 of this Embodiment is demonstrated.

  The attachment method of the fender wall 2 of the present embodiment configured as described above uses the fender wall 2 from which the PC steel rods 22,... Are projected, and is attached to the overhanging portion 12 of the pier 1. The PC steel rods 22,... Are inserted from the bottom into the provided through holes 14,..., And the PC steel rods 22,. The material wall 2 is joined.

  For this reason, the fender wall 2 can be fixed to the lower surface side 11a of the pier 1 in a short time. Moreover, if it is joining by tensioning PC steel bar 22, ..., reliability is high and both can be integrated reliably. That is, it is not necessary to assemble reinforcing bars at the joint as in the conventional case, or to cure until the concrete filled in the joint is cured.

  Further, since the wall portion 21 is guided to a predetermined position by inserting the PC steel rods 22... Into the through holes 14..., The fender wall 2 can be attached to an accurate position. . That is, by providing the overhanging portion 12 with the opening 15 through which the suspension wire 321 is inserted in addition to the through hole 14, the PC steel rod 22 is positioned directly below the through hole 14 using the opening 15. Thus, the fender wall 2 can be suspended as described above, and the joining operation can be quickly performed without wasting time for alignment.

  Moreover, if it is the method of transferring a load using the two cranes 31 and 32, the fender wall 2 can always be supported by one of the cranes 31 and 32, workability is good, Positioning can be easily performed.

  Furthermore, the fender material wall 2 and the overhang | projection part 12 can be joined more firmly by using an adhesive agent together. Moreover, since the convex part 23 becomes a shear key even if a horizontal direction external force acts on the fender wall 2 by joining through uneven | corrugated fitting, a shear resistance can be raised. The concave / convex fitting may be a concave portion on the fender wall 2 side and a convex portion on the lower surface side 11a.

  In addition, by filling the gap between the through hole 14 and the PC steel rod 22, rainwater or seawater does not enter the gap and the PC steel rod 22 is not corroded, thereby improving the anticorrosion performance.

  Furthermore, if the fender material wall 2 with the fender material 24 attached to the side surface is attached, the fender material 24 is also arranged at a predetermined position only by attaching the fender material wall 2, so the diver Thus, the work of attaching the fender 24 to the wall 21 later can be omitted.

  Although the best embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes that do not depart from the gist of the present invention are possible. Are included in the present invention.

  For example, in the above embodiment, the opening 15 through which the suspension wire 321 is inserted has been described as a hole. However, the present invention is not limited to this, and a notch that is open on one side can be used as the opening.

  Moreover, although the said embodiment demonstrated the method of attaching the fender wall 2 using the two cranes 31 and 32, it is not limited to this, For example, the fender wall 2 is used for It may be a method of carrying the ship directly under the overhanging portion 12 and connecting the suspension wire 321 of the crane 32 to the suspension fitting 26.

  Furthermore, in the said embodiment, although the uneven | corrugated fitting was joined by the joining surface formed by the match cast system, it is not limited to this, The joining of the fender material wall 2 and the overhang | projection part 12 If the accuracy of the surface cannot be ensured, a frame is installed at the edge that becomes the boundary between the lower surface side 11 a of the slab 11 and the upper surface of the wall portion 21, and no shrinkage occurs between the fender wall 2 and the overhanging portion 12. You may join by filling grout.

It is sectional drawing explaining the attachment method of the fender wall of the best embodiment of this invention. It is a top view explaining the attachment method of the fender material wall of the best embodiment of this invention. It is sectional drawing explaining the process of drawing a fender wall just under an overhang | projection part using two cranes. It is a front view explaining the state which suspended the fender wall using two cranes. It is explanatory drawing explaining the process of suspending the load of a fender wall with two cranes. It is explanatory drawing explaining the process of lifting a fender wall up. It is explanatory drawing explaining the process of introducing tension | tensile_strength to PC steel bar. It is explanatory drawing explaining the process of inject | pouring grout to a through-hole and removing a scaffold.

Explanation of symbols

W Water surface 1 Pier (water structure)
11a Lower surface side 12 Overhang part 14 Through hole 15 Opening part 16 Recessed part (concave fitting)
2 Fender wall (precast member)
22 PC steel bar 23 Convex part (concave unevenness)
24 Fender 31 Crane (first crane)
32 Crane (second crane)
321 Hanging wire 5 Tension jack

Claims (5)

In the mounting method of the precast member for attaching the precast member to the lower surface side of the floating structure overhanging on the water,
Producing a precast member from which a PC steel bar is projected;
Parallel to or before or after the step, constructing a floating structure formed in an overhanging portion in which a through hole through which the PC steel rod is inserted and an opening through which the suspension wire is inserted are overhanged on the water;
With the precast member suspended by the first crane, the suspension wire of the second crane is inserted through the opening and connected to the precast member, and the load is transferred to the suspension wire of the second crane. A process of hanging,
Lifting the precast member and inserting the PC steel rod into the through hole;
A method of attaching a precast member, comprising the step of tensioning the PC steel bar and joining the precast member and the overhanging portion. In the step of bonding the precast member and the protruding portion, of the precast members according to claim 1, characterized in that for joining the lower surface of the upper surface and the overhanging portion of the precast member with an adhesive installation method. In the step of bonding the precast member and the protruding portion, according to claim 1 or 2, characterized in that for bonding the lower surface of the projecting portion and the upper surface of the precast member via the concave-convex fitting A method for attaching a precast member. The step of joining the precast member and the overhang portion fills a gap between the through-hole and the PC steel rod, according to any one of claims 1 to 3 . A method for attaching a precast member. The said precast member is a member by which the fender was attached to one side surface, The attachment method of the precast member as described in any one of Claim 1 thru | or 4 characterized by the above-mentioned.

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