JP4633584B2 - Precast concrete girder - Google Patents

Description

  The present invention relates to a precast concrete girder member that is used to form an artificial ground by laying between a large number of piles and pillars that are separated from each other, such as a pier structure and a multilevel parking lot.

  Conventionally, when an artificial ground such as a pier structure is formed, a number of steel pipe piles are erected at a predetermined interval, and a formwork support is provided between the steel pipe piles and the support After placing the bars on the work, the concrete was cast to construct the cross beam, and then the floor as the superstructure was constructed. Therefore, especially in jetty structures, it is necessary to carry out a series of processes such as formwork, reinforcement, concrete placement, and curing of superstructure on the sea where the scaffolding is unstable. Problems have been pointed out that the work is complicated and requires a long time to complete, and the work cost increases.

  Therefore, it has been proposed to use a precast concrete girder member for the purpose of reducing the construction cost by improving the efficiency and facilitation of the cross girder construction work when constructing such artificial ground. In Patent Document 1, a steel frame is projected from the end face of a precast portion of a beam (girder member) made of precast concrete, while a cradle is provided on the pile, and the steel frame tip portion of each beam is placed on the cradle. After that, a pile / beam joint structure has been proposed in which concrete is filled in and integrated with the space between the end faces of the precast part of the pile and the beam. Moreover, in patent document 2, while attaching the pile periphery cup member to the head outer side of a pile, the hook was protruded in the both ends of the precast girder member, and this hook was attached to the pile head. Later, artificial ground has been proposed in which each pile head and pile-around cup member and the end of the precast girder member are integrated with concrete.

JP-A-8-120638 (Claim 1, FIG. 2) JP-A-8-218342 (Claim 1, FIG. 2)

  The joint structure described in Patent Document 1 absorbs pile erection errors to some extent because the steel frame protruding from the end face of a precast concrete beam (girder member) is placed on a cradle on the pile. Although there is an advantage that can be done, it is necessary to install a separate formwork on the lower surface of each joint to place concrete at the joint between each pile and beam, and the installed formwork is also dismantled and removed after the concrete solidifies There was a drawback that had to be done. On the other hand, in the artificial ground described in the above-mentioned Patent Document 2, there is an advantage that it is not necessary to install and dismantle the formwork because the cup-around cup member replaces the formwork. The piles must be erected with high accuracy in order to hook the hooks at the ends of the precast girder members. Therefore, especially in the case of offshore work, a great amount of time and cost is required for the erection work of the piles. There was a drawback that would have been necessary.

  The present invention has been made in view of such circumstances, and the problem is that while it is a standard precast concrete girder member of a certain length, it can absorb pile erection errors. An object of the present invention is to provide a precast concrete girder member capable of extremely simplifying the installation and dismantling / removing work of the formwork at the time of on-site concrete placement for integrating the pile and the girder member.

  In order to solve the desired problem, the precast concrete girder according to the present invention is constructed between steel pipe piles erected at predetermined intervals, and a straight beam-shaped main body and a part of the main body And an annular socket portion that is externally attached to the steel pipe pile head, and the socket portion is provided below the main body so that the top surface thereof is flush with the bottom surface of the main body. And the latching | locking part which protrudes horizontally from the said main body and is suspended by the said steel pipe pile top part was arrange | positioned above this socket part.

  The straight beam-shaped main body need not be, for example, a strict prismatic shape, and any cross-sectional shape or side surface shape can be adopted as long as it functions as a girder member. For example, the cross-sectional shape changes in the longitudinal direction. You can also use what you do. The precast concrete girder member according to the present invention is characterized in that an annular socket portion is provided in a part of such a main body, and the inner diameter is larger than the outer diameter of the steel pipe pile so as to be able to absorb the construction error of the steel pipe pile. Although it will be large, when it is extrapolated to the steel pipe pile head, the hook part protruding from the main body above the socket part will be suspended on the steel pipe pile head top part, so the girder member will not fall off .

  Rather, in the present invention, by securing a certain gap between the outer periphery of the steel pipe pile and the inner periphery of the socket part, the construction work between the steel pipe piles becomes easy, and the installation is suspended from the steel pipe pile head. There is an advantage that the presence of the temporary scaffolding is not an obstacle to the mounting of the socket part. Temporary scaffolding facilitates the work of backing the formwork plate against the gap between the bottom of the socket part and the steel pipe pile, and if concrete is placed after the formwork board is supported, the steel pipe pile outer periphery and the socket part inner periphery The gap can be easily closed.

  The top surface of the socket part extends from the main body in a stepped manner downward from the main body so that only the main body, in particular, only the latching portion protrudes outward, is positioned on the same plane. The end of another girder member that is continuously suspended from the steel pipe pile with the socket part extrapolated is placed on the top surface of the socket part, and each main body ceiling in the extended or orthogonal girder member The surfaces will be aligned on the same plane.

  When extrapolating the socket part, it is desirable to install a cradle on the top of the head where the head of the steel pipe pile has been appropriately processed in advance. This is to ensure the suspension and joining of the latching portions in each girder member while adjusting the horizontal level between the steel pipe piles by the cradle. As such a pedestal, for example, a welded combination of H-shaped steel in a cross shape is preferably used.

  The hooks suspended on the top of the steel pipe pile (including the cradle) are designed so that the girder members are abutted against the same steel pipe pile from two directions on the same line. It is set to a length that fits within the center position.

  As the precast concrete girder member according to the present invention, it is desirable to appropriately select and use different types of girders according to the standing position of the steel pipe pile to be installed. That is, as a basic type, a socket part is preferably provided only at one end of the main body, and only a latching part protruding outward is provided at the other end of the main body. For the steel pipe pile located in the steel pipe pile, it is desirable that the pier projects beyond the steel pipe pile portion, so the socket part is provided at a position closer to one end side of the main body, and above the socket part. A type in which the latching part located is constructed so as to connect between the main bodies on both sides of the socket part, and only the other latching part protrudes outward at the other end of the main body. Used. In this girder member, the latching part located above the socket part is constructed so as to connect the main bodies on both sides of the socket part. The new girder member is connected to the tip side from the socket part. This is because there is no connection between the two main bodies from the viewpoint of reinforcing the socket.

  In addition, for example, for steel pipe piles located at the pier base end, socket portions are provided at two positions near the one end and the other end side of the main body, and the hook portions located above the latter socket portion are provided. A type constructed so as to connect the main bodies on both sides of the socket part is preferably used. This is because each socket portion is extrapolated between the steel pipe pile closest to the pier base and the steel pipe pile closest to the next.

  In the precast concrete girder member according to the present invention, since the annular socket portion is extrapolated to the steel pipe pile head and the latching portion is suspended from the pile head top portion, the inner diameter of the socket portion is larger than the outer diameter of the steel pipe pile. If it is set to, the construction error of the steel pipe pile can be absorbed sufficiently. The clearance between the outer circumference of the steel pipe pile and the inner circumference of the socket part enables the temporary scaffold to be suspended from the steel pipe pile head prior to extrapolation of the socket part, thus contributing to the safety of workers.

  Moreover, when the hook part of another girder member is suspended so as to extend on the same line as the girder member from above the socket part extrapolated to the steel pipe pile head, Since a space surrounded by the edges of each main body placed on the top surface of the main body is created, the socket part is part of the mold, and the gap between the inner periphery and the outer periphery of the steel pipe pile head or the end of the girder member Just by closing the gaps between edges as a simple formwork with plate material etc., concrete is placed in the space in place without requiring large formwork and formwork support work, and each girder member and The steel pipe pile head can be integrated. As a result of the socket part functioning as a part of the formwork in this way, it is possible to greatly reduce the amount of concrete to be driven.

  In the precast concrete girder member according to the present invention, the socket part is provided below the main body so that the portion of the artificial ground such as a pier that is at the lowest position and is easily affected by tides is already halfway. Since it will be constructed in the finished product state, the tide work and underwater work, which were unavoidable when installing a port pier, etc., are greatly reduced, which can contribute to shortening the construction period. Moreover, since the socket part and the concrete part cast in-situ above it are integrally joined to the steel pipe pile, the thickness of the joint part between the steel pipe pile head and the girder member is secured, and high rigidity is obtained. It is done.

  Hereinafter, a precast concrete girder according to the present invention will be described in detail with reference to the drawings. 1 to 3 are views showing an example of a precast concrete girder according to the present invention, and showing the most basic type. That is, the straight beam-shaped main body 1 made of precast concrete and having a substantially square cross section is provided with the socket portion 2 with the latching portion 31 on one end side and only the latching portion 32 on the multi-end side. . Therefore, when the girder member of this example is installed between two steel pipe piles standing upright at an interval, when the annular socket part 2 is extrapolated to the one side steel pipe pile head, the socket part 2 A latching portion 31 that is horizontally projected from the main body 1 is suspended on the steel pipe pile head and is directed outward from the other end side of the main body 1 with respect to the opposite steel pipe pile head. The horizontally projecting latching portion 32 is suspended.

  The socket part 2 in this example is provided with a frame 22 having a square shape in plan view that is chamfered (cut off at the four corners) around a vertical through-hole 21 that opens in a perfect circle, and the top surface 23 is a main body. 1 is provided in a stepped manner via an arm portion 12 extending so as to be inclined downward from the main body 1 so as to be positioned on the same plane as the bottom surface 11 of the main body 1. The diameter of the through-hole 21 is larger than the diameter of the steel pipe pile, and particularly when the steel material for temporary scaffold installation is welded to the side surface of the steel pipe pile, the diameter is set to a size including the thickness of the steel material. In the socket part 2 having a square shape in plan view, the ends of the different girder members abut on the three sides other than the extending side of the arm part 12 as if they were placed on the top surface 23 of the socket part 2. Therefore, the upper space of the socket portion 2 is generally surrounded by the end portions of these girder members.

  4 to 6 are views showing other examples of precast concrete girder members according to the present invention, and showing a type suitable for a pier tip. That is, for the steel pipe pile located at the tip of the pier, it may be desirable that the pier projects further beyond the steel pipe pile (on the sea side). Although it is provided in the middle of a certain thing, while the latching | locking part 33 located above the said socket part 2 is constructed so that between the main bodies 1 and 1 isolate | separated by the socket part 2 may be connected, Only another latching portion 32 protrudes outward from the other end side.

  More specifically, the socket part 2 is provided at a position one step below the main body 1 through the two downwardly inclined arm parts 12 and 12 at a position about 1/3 in the length direction of the main body 1. A latching portion 33 located above the socket portion 2 is constructed so as to connect between the main bodies 1 and 1 located on both sides of the socket portion 2. And only the other latching part 32 protrudes outward at the end part of the main body 1 on the side farther from the socket part 2. The hooking portion 33 positioned above the socket portion 2 and the hooking portion 32 protruding from the end of the main body 1 can be formed of a single continuous steel material.

  FIG. 7 thru | or FIG. 9 is the figure which showed the further another example of the precast-concrete girder member which concerns on this invention, and is the figure which showed the type suitable for pier base end. In other words, for steel pipe piles that are closest to the pier base (quay side), the foundation work on the quay side is involved in installing the girder members starting from the quay side. Next, in order to simplify the foundation work on the quay side with a single girder member between the steel pipe piles erected on the sea side, socket parts 2 are arranged at two places on the main body 1. Yes.

  More specifically, the first socket portion 2A is provided at a position that is lowered by one step from the main body through the two downwardly inclined arm portions 12 and 12 at a position about 1/4 of the length of the main body 1. The latching portion 34 located above the first socket portion 2A is installed so as to connect the main bodies 1 and 1 located on both sides of the first socket portion 2A. Then, at the end of the main body 1 on the side farther from the first socket portion 2A, the socket portion 2B with the latching portion 31 that is cut upward is lowered by one step from the main body through the arm portion 12 that is also inclined downward. Extended to the position.

  10 to 15 are schematic views showing a construction procedure of the precast concrete girder member according to the present invention. First, a plurality of steel pipe piles K are erected at predetermined intervals (FIG. 10). Next, the steel foundation is welded to the side wall of each steel pipe pile K to construct a scaffold foundation F1 projecting in the left-right direction, and two rows of temporary scaffolds F2 are installed so as to be bridged between the scaffold foundations F1 of the steel pipe pile K. On the other hand, after processing the top part of each steel pipe pile K so that it may become the same height as the top part of the other steel pipe pile K, the receiving stand R which assembled H-shaped steel in the cross is welded (FIG. 11). In order to extrapolate the socket portion 2 to the steel pipe pile K, the lateral width of the cradle R is set so as to be accommodated in the through hole 21 of the socket portion 2.

  Subsequently, the precast concrete girder member according to the invention is installed in the same longitudinal direction as the installation direction of the temporary scaffold F2. In the example shown in FIG. 12, after installing the girder member X1 of the type suitable for the pier base end shown in FIGS. 7 to 9 on the quay G side, the previous FIG. 1 to FIG. The girder member X2 of the basic type shown in is continuously installed. As shown in the figure, when the girder members X1 and X2 are installed, the retaining members 31, 32 and 33 are placed on the cradle R, thereby preventing the girder members X1 and X2 from falling. is there.

  Subsequently, the girder member X3 in the left-right direction orthogonal to the erection scaffold F2 is erected sequentially (FIG. 13). The girder member X3 in the illustrated example has the socket portions 35 and 35 projecting outward from both ends and does not have the socket portion 2, but the socket portion of the girder members X1 and X2 previously installed. By placing the latching portion 35 on the cradle R so as to come into contact with 2, it is possible to realize a state in which the space on the socket portion 2 extrapolated to each steel pipe pile K is generally enclosed.

  The gap between the adjacent girder members X1, X2, and X3 above each socket part 2 and the gap between the through hole 21 of the socket part 2 and the outer peripheral surface of the steel pipe pile K are suspended by the formwork E and not shown. Closed by the formwork. Since the strong socket portion 2 is positioned at the lowermost position and each gap is not so wide, it is sufficient to install a simple form E or the like. After each gap is closed with a mold E or the like, concrete C is placed in the upper space of the socket part 2 surrounded by the girder members X1, X2, X3, and the steel pipe pile K and each girder member X1, X2, X3 is integrated (FIG. 14). After the cast-in-place concrete C is solidified, a structure such as a pier is completed by constructing a floorboard on the floor foundation (see Fig. 15) from which the construction scaffold F2 and formwork E are removed.

It is a top view which shows an example of the precast concrete girder member which concerns on this invention. It is a front view of the example of FIG. It is a perspective view of the example of FIG. It is the top view which showed the other example of the precast concrete girder member which concerns on this invention. It is a front view of the example of FIG. It is a perspective view of the example of FIG. It is the top view which showed the further another example of the precast concrete girder member which concerns on this invention. It is a front view of the example of FIG. It is a perspective view of the example of FIG. It is the schematic which shows the construction procedure of the precast concrete girder member which concerns on this invention, and is a perspective view which shows the state which stood the steel pipe pile. It is the schematic which shows the construction procedure of the precast concrete girder member concerning this invention, and is a perspective view which shows the state which installed the temporary scaffold and the receiving stand in the steel pipe pile. It is the schematic which shows the construction procedure of the precast concrete girder member which concerns on this invention, and is a perspective view which shows the state which has constructed two types of girder members. It is the schematic which shows the construction procedure of the precast-concrete girder member which concerns on this invention, and is a perspective view which shows the state which has constructed the girder member of the left-right direction. It is the schematic which shows the construction procedure of the precast concrete girder member which concerns on this invention, and is a perspective view which shows the state which has poured concrete into the space on a socket part. It is the schematic which shows the construction procedure of the precast concrete girder member which concerns on this invention, and is a perspective view which shows the completion state of a floor foundation.

Explanation of symbols

1 Body 2 Socket part
11 Bottom of the main unit
21 Through hole
22 Frame
31,32,33 Hanging part C Cast-in-place concrete E Formwork F1 Scaffolding foundation F2 Temporary scaffolding K Steel pipe pile R Base

Claims (4)

A precast concrete girder member erected between steel pipe piles erected at a predetermined interval, and a straight beam-shaped main body, and an annular socket disposed on a part of the main body and extrapolated to the steel pipe pile head The socket part is provided below the main body so that its top surface is flush with the bottom surface of the main body, and above the socket part from the main body. A precast concrete girder member provided with a latching portion that is horizontally projected and is suspended from the top of the steel pipe pile. The precast concrete girder according to claim 1, wherein the socket part is provided only at one end of the main body, and only the latching part protrudes outward from the other end of the main body. A socket part is provided at a position closer to one end side of the main body, and a latching part located above the socket part is constructed so as to connect the main bodies on both sides of the socket part, and is attached to the other end of the main body. 2. The precast concrete girder member according to claim 1, wherein only another latching portion protrudes outward. The socket part is provided at two positions near the one end and the other end of the main body, and the latching part located above the latter socket part is constructed so as to connect the main bodies on both sides of the socket part. The precast concrete girder according to claim 1, wherein the girder member is precast concrete.

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