JP2005097879A - Reinforcing basket and method of building the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reinforcing basket which is easily assembled and built at the same location in the field through a series of procedures, to thereby minimize a space of a construction yard as much as possible, and to provide a method of building the cage. <P>SOLUTION: The reinforcing basket 2 is assembled and built over an excavated hole in the construction field, and consists of a reinforcing frame body 4 which is formed by assembling vertical members 4a and horizontal members 4b, vertical reinforcement panels 6 which are each assembled like a plane beforehand, and fastened to a peripheral portion of the reinforcing frame body, and a strand 8 spirally wound on and fastened to the outside of the vertical reinforcement panels. The reinforcing frame body is temporarily fixed to a fixing jig 16 which is stretched over the top of the excavated hole 12 and removably arranged across the same, and the vertical reinforcement panels 6 formed like the plane beforehand are fastened to the periphery of the reinforcing frame body. Thereafter the strand 8 is wound on the periphery of the vertical reinforcement panels, and the thus built cage is hung and lowered by a building machine 14 into the hole down to a predetermined depth. Thereafter the reinforcing frame bodies, the vertical reinforcement panels, and the strands are successively added to an upper portion of the inserted reinforcing basket 2 down to a desired depth. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a reinforcing bar to be assembled and built on an excavation hole in a construction site, and a method for installing the same.

  Conventionally, the technique disclosed in Patent Document 1 is known as a method for building a rebar bar having a large cross section and a large size. This method of building a reinforcing bar rod is an intermediate reinforcing bar structure that is a precursor of a reinforcing rod rod that has a predetermined cross-sectional distance between the main reinforcing bars of the reinforcing rod rod, but has a predetermined spacing. Then, this intermediate rebar structure is lifted with a crane or the like and built in the excavation hole, and the PC steel wire is continuously wound on the outer periphery of the main bar in synchronism with this build-up speed to form a strap. Is.

  And, according to the method of building up the reinforcing bar, even if the reinforcing bar has a large cross section and a large size, there is no buckling or bending at the time of start-up, and PC is continuously synchronized with the building speed. By arranging the strands of steel, continuous erection is performed, and even if there is no intermediate strip reinforcement, the strength is sufficient.

  On the other hand, the technique disclosed in Patent Document 2 is known as a method for manufacturing a reinforcing bar rod that can be manufactured efficiently and easily without complicated operations. The manufacturing method of this reinforcing bar is as follows: (a) The reinforcing bar panel is hung from the upper side with respect to the panel receiving portion provided at the opposite position in each lower part of the fixed type and movable type reinforcing bar assembly, and the lower end of the reinforcing bar panel is Reinforcing bar panel placing process to be placed on the panel receiving part, and (b) Reinforcing bar panel placed on the panel receiving part in the reinforcing bar panel placing process to the reinforcing bar assembly by a detachable panel fixture. Fixed along the panel, and then removing the lifting jig for lifting the reinforcing bar panel, and (c) moving the distance between the reinforcing bar panels fixed to the two reinforcing bar cages by the panel fixing process. A bar arrangement process in which the bar is adjusted to a predetermined distance by moving the gantry, and (d) in the panel fixing process after attaching the reinforcing bar rod hanging jig to the upper end of the reinforcing bar rod that has been manufactured through the above steps. Rebar panels and Remove the Sujikago assembled frame and fixed panel fixture, is to implement a conveying step of conveying to the other, such as reinforcing bar cage temporary stand, sequentially.

Then, according to this manufacturing method, a work of attaching a suspension beam to every reinforcing bar panel, and a pair of front and back reinforcing bar panels that actually enter the reinforcing bar rod manufacturing process on the reinforcing bar rod assembly stand are connected to each other by connecting girders. By assembling the beams together, it is possible to start assembly work without the need for fixing work or the like. Therefore, it is possible to reliably achieve a remarkable improvement in work efficiency and a reduction in costs related to personnel and equipment. Also, there is no need to use the suspension beam consistently until the end of the rebar rod production, so even when a large number of rebar panels are used to make a rebar rod in large-scale construction, The initial investment for the project can be reduced to the minimum considering diversion, and can greatly contribute to the cost reduction of the whole construction. In addition, when performing the work to move the moving rebar bar assembly to a fixed width of the rebar bar to the fixed bar bar assembly frame, the positional relationship between the opposing bar panels does not wait for subsequent correction. Can be secured and maintained.
JP 2001-152447 A JP 2001-105070 A

  By the way, in the rebar erection technique in the above-mentioned patent document 1, the intermediate rebar structure which is a precursor of the reinforcing bar is assembled in advance in the factory and carried into the construction yard or assembled in the construction yard. The intermediate rebar structure is transported to the erection position by a crane to be suspended, and lowered into the excavation groove while winding a strand around the outer periphery of the suspended intermediate rebar structure. Therefore, it is necessary to secure a transportation space or a space for assembly in the construction yard. Further, even in the rebar erection technique described in Patent Document 2, it is necessary to secure an assembly space for the reinforcing bar and a transport space after the assembly in the construction yard.

  However, in recent years, there has been a demand for efficient arrangement of structures in order to make effective use of land in a multifaceted and three-dimensional manner. For this reason, it is very important to secure a construction yard with sufficient space at the construction site. It has become difficult. For this reason, a great deal of labor is required to perform a series of operations of assembling, moving, and building a reinforcing bar in a limited construction yard space. In addition, the work of connecting the upper and lower rebar rods at the built-in position is a task with a large work radius, so the field work such as building up the rebar rods is difficult and great consideration is given to safety. Had to pay.

  In particular, in the case of wall foundations, the cross-sectional area of the excavation is large, so the size of the reinforcing bar is much larger than that of a normal cast-in-place pile or one element of the underground continuous wall, In addition, the weight increases. For this reason, it is very difficult to transport a general road to the construction site after production, and inevitably it will be necessary to produce it in the construction yard, and the reinforcing bar made at the site will be used. Carrying it to the erection position and erection it while sequentially connecting one piece at a time in the excavation groove requires a fairly large crane, and it is necessary to secure a wider movement space. become. For this reason, there is a strong demand for the development of a technology that can easily perform the work from assembly to installation in a construction yard with a limited space.

  The present invention has been made in view of such circumstances, and its purpose is to easily and consistently perform a series of operations from assembling to erection of the reinforcing bar on the erection position of the construction site. Accordingly, it is an object of the present invention to provide a reinforcing bar rod and a method for installing the same, which can reduce the space of a construction yard as much as possible.

  In order to achieve the above object, the present invention comprises a reinforcing bar rod and a method for installing the same as follows.

  The invention according to claim 1 is a reinforcing bar that is assembled and built on an excavation hole at a construction site, a reinforcing frame formed by assembling vertical members and cross members, and the reinforcing frame It is characterized by comprising a vertical reinforcing bar panel that is assembled in advance in a substantially flat shape that is fastened to the outer peripheral portion, and a strand that is spirally wound around the outer side of the vertical reinforcing bar panel.

The invention according to claim 2 is a method for building a reinforcing bar that is assembled and built on an excavation hole at a construction site, and has the following steps (1) to (6).
(1) A reinforcing frame body installation step in which a reinforcing frame body formed by assembling vertical members and cross members is fixed and installed by a fixing jig provided so as to be removable over the top of the excavation hole.
(2) A vertical reinforcing bar attachment step in which a vertical reinforcing bar panel formed in advance in a substantially flat shape is fixedly attached to the outer peripheral portion of the temporarily placed reinforcing frame.
(3) A strand attachment process in which a strand is spirally wound and fixed to the outside of the vertical reinforcing bar panel fixed to the reinforcing frame.
(4) After removing the fixing jig while supporting the reinforcing bar made up by winding and fixing the strand with the wire of the built-in machine arranged on the side of the top of the excavation hole, the excavation hole Reinforcing bar scissors insertion process that inserts and descends to a predetermined depth.
(5) With the fixing jig inserted into the upper part of the inserted reinforcing bar rod and fixed again, a new reinforcing frame is added to the upper side of the reinforcing bar rod, and A reinforcement insertion step in which the steps of the vertical rebar installation step 2) to the rebar rod insertion step (4) are sequentially performed.
(6) A concrete placing step in which concrete is placed in the excavation hole in a state where the fixing jig is inserted into the upper portion of the reinforcing bar inserted to a desired depth and fixed again.

  The invention according to claim 3 is characterized in that the strand attaching step (3) and the reinforcing rod insertion step (4) are performed in parallel.

  The invention according to claim 4 is characterized in that the winding and fixing of the strand is performed by using a strand winding machine provided detachably on the top of the reinforcing frame.

  The invention according to claim 5 is characterized in that the vertical reinforcing bar panel is attached with its upper end positioned below the upper end of the reinforcing frame by a predetermined height.

  In the invention of the reinforcing bar according to the first aspect, the vertical reinforcing bar panel formed in a substantially flat shape in advance in a factory or the like is attached to the outer periphery of the reinforcing frame, and the strand is wound around the outer periphery to constitute the reinforcing bar. Even if it is not possible to secure sufficient rebar assembly space in the construction yard of the construction site, it can be easily manufactured and built at the construction position on the excavation hole, and the space in the construction yard can be reduced as much as possible. And a large crane for transporting the reinforcing bar can be made unnecessary.

  In the invention of the reinforcing bar erection method according to claim 2, since the reinforcing bar is assembled and built on the excavation hole in the construction site, the space for assembling and manufacturing the reinforcing bar in the construction yard. It is not necessary to ensure the wide as in the conventional case. In addition, since it is not necessary to move the rebar bar from the assembly production position to the built-in position, there is no need for a moving space or a large crane for movement, and the winding machine and vertical rebar panel can be lifted during assembly. A small crane is sufficient. That is, a series of operations from assembling to erection of the reinforcing bar can be easily and consistently performed at the erection position of the construction site, and the space in the yard can be reduced as much as possible.

  In the reinforcing bar erection method invention according to claim 3, the strand winding process and the reinforcing bar insertion process are performed in parallel, and the rebar bar is lowered while winding the strand, thereby enabling efficient construction. The construction period can be shortened as much as possible.

  In the invention of the reinforcing bar construction method according to claim 4, since the winding of the strand is performed using a strand winding machine that is detachably provided on the top of the reinforcing frame body, the vertical reinforcing bar panel is used to stop the strand. It can be easily wound spirally around the outer periphery of the vertical reinforcing bar panel while rotating around the outer periphery of the attached reinforcing frame.

  In the invention of the reinforcing bar construction method according to claim 5, when connecting the upper and lower reinforcing frame members to each other, the upper end portion of the lower reinforcing frame member has a vertical reinforcing bar panel and a strand extending over a predetermined height. Since the blank part to which is not attached is formed, the connection work with the upper reinforcing frame can be performed easily and smoothly.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1A to FIG. 1D are schematic process diagrams showing a case where the reinforcing bar rod and the building method according to the present invention are applied to a wall foundation reinforcing rod rod. ~ XII are shown in an elevation view of (a) and a plan view of (b).

  As shown in these drawings, the wall foundation reinforcing bar 2 is assembled and manufactured at the installation position at the construction site. The reinforcing frame 4 is preliminarily made into parts at a factory or the like and is carried in. The vertical reinforcing bar panel 6 is assembled to the outer periphery of the reinforcing frame 4, and the PC steel wire strand 8 is provided by being wound spirally around the vertical reinforcing bar panel 6.

  The reinforcing frame 4 is formed by assembling a vertical member 4a and a horizontal member 4b made of mold steel or the like in a rectangular parallelepiped shape in the vertical and horizontal directions, and further includes a four-faced portion 4c for improving in-plane rigidity. Is provided. The vertical reinforcing bar panel 6 is formed by connecting a number of vertical reinforcing bars 6a with connecting members such as horizontal reinforcing bars 6b at predetermined intervals and assembling them in a substantially planar shape such as a net-like shape or a hook shape. It is made in advance in a size that can be transported by truck in the factory and then brought into the construction yard. Then, the vertical reinforcing bar panel 6 is attached to the outer peripheral portion of the reinforcing frame 4 above the excavation hole 12 at the construction site and fixed, and the strand 8 is wound around the outer peripheral portion by the winding machine 10 one by one. The wall foundation rebar rod 2 is assembled from the lower side.

  Next, a detailed description will be given of a method for assembling and installing the wall foundation rebar rod 2.

<< (1) Reinforcement frame installation process >>
As shown in I (a) and (b) of FIG. 1A, first, a pair of built-in machines 14 are provided on the side of the top of the excavation hole 12 at the construction site, and crosses the top of the excavation hole 12. A fixing jig 16 made of H-shaped steel or the like is stretched over and provided to be removable. Then, the reinforcing frame 4 is placed on the fixing jig 16 and formed by assembling the vertical members 4a and the horizontal members 4b, and the horizontal member 4b at the lower end of the reinforcing frame 4 is fixed. It is fixedly locked to the tool 16 and temporarily placed.

  Here, the four corners of the reinforcing frame 4 are formed in the shape of a triangular prism so that the corners thereof become obtuse in consideration of winding of the strands 8 described later. The reinforcing frame 4 may be transferred onto the fixing jig 16 with a crane or the like after assembling at another place in the construction yard if the construction yard has a space. If there is no room in the space, it may be assembled on the fixing jig 16. If only the reinforcing frame 4 is used, the weight does not increase so much, and the moving crane is small and functions sufficiently.

<< (2) Vertical rebar mounting process >>
As shown in II of FIG. 1A, the vertical surfaces of the reinforcing frame 4 that is temporarily placed on the fixing jig 16 are formed into a substantially flat shape in advance at the factory and are carried by a truck or the like. The rebar panel 6 is secured by a wire or the like while being suspended by a crane or the like. These vertical rebar panels 6 are manufactured in a relatively small size that can be transported by truck, and the weight of the panel is not too heavy. Here, the upper end portion of the vertical reinforcing bar panel 6 is attached to be positioned lower than the upper end portion of the reinforcing frame 4 by a predetermined height to form a blank area without the vertical reinforcing bar on the upper portion of the reinforcing frame 4. . This blank area is provided in order to ensure workability in the adding process described later.

<< (3) Strand attachment process >>
As shown in III of FIG. 1A and IV to VI of FIG. 1B, the strand 8 is spirally wound and fixed to the outside of the vertical reinforcing bar panel 6 fixed to the reinforcing frame 4. The winding and fixing of the strand 8 is performed by using a strand winding machine 10 that is detachably provided on the top of the reinforcing frame 4.

  That is, as shown in III (a) and (b) of FIG. 1A, a mounting table 18 for mounting and fixing the strand winding machine 10 is attached to the top of the reinforcing frame 4. The winding machine 10 is lifted and fixed on the mounting table 18 by a crane or the like. The winding machine 10 includes a feeding drum 10a around which a long strand 8 is wound, and a turntable 10b that supports the drum 10a. The take-up drum 10a has a rotation axis direction oriented horizontally, while the turntable 10b has a rotation axis direction oriented vertical. That is, as shown in IV (a), (b) to VI (a), (b) of FIG. 1B, the reinforcing frame in which the longitudinal reinforcing bar panel 6 is fixed to the tip of the strand 8 fed from the feeding drum 10a. After fixing and locking to the lower end of the body 4, the strand 8 is fed out from the feeding drum 10a while rotating the turntable 10b in one direction, whereby the strand 8 is reinforced with the vertical reinforcing bar panel 6 fixed thereto. The outer periphery of the body 4 can be easily wound around the outer periphery of the vertical reinforcing bar panel 6 while being wound around the outer periphery. Here, the strand 8 is fixed to the vertical reinforcing bar 6a of the vertical reinforcing bar panel 6 at an appropriate position sequentially with a wire or a clip. Then, the winding of the strand 8 is finished leaving a predetermined height at the upper end portion of the vertical reinforcing bar panel 6, the strand 8 is cut, and the cut end portion is fixedly locked to the vertical reinforcing bar panel 6. The winding machine 10 and the mounting table 18 are removed.

<< (4) Reinforcing rod insertion process >>
As shown in V (a), (b) and VI (a), (b) of FIG. 1B, the reinforcing bar insertion process is performed together with the strand attaching process. That is, in the reinforcing bar charging process, the wall basic reinforcing bar 2 of the portion assembled by the winding of the strand 8 is synchronized with the winding speed during winding of the strand 8, 12 is inserted. Specifically, first, the wires 14a of the pair of erection machines 14 arranged on the side of the top of the excavation hole 12 are connected to the lower end of the reinforcing frame 4 of the wall foundation rebar 2 respectively. Next, the connection between the fixing jig 16 and the reinforcing frame 4 of the wall foundation reinforcing bar 2 is removed, the wire 14a of the erection machine 14 is wound up, and the wall foundation reinforcing bar 2 is temporarily levitated from the fixing jig 16. It supports with the erection machine 14, and the lower fixing jig 16 is removed in this state. After the dredging, the wall foundation rebar rod 2 is lowered by matching the winding speed of the strand 8 wound spirally upward with the feeding speed of the wire 14a of the erection machine 14, and the inside of the excavation hole 12 Insert and lower to a predetermined depth. Then, the fixing jig 16 is inserted through the wall foundation reinforcing bar 2, the fixing jig 16 is again provided over the top of the excavation hole 12, and the wall foundation reinforcing bar 2 is again attached with the fixing jig 16. To support.
In this case, the reinforcing bar punch insertion process is performed in parallel with the strand attaching process. However, these steps may not be performed at the same time, and the reinforcing bar punching process may be performed after the end of the strand attaching process.

<< (5) Additional insertion process >>
As shown in VI (a), (b) of FIG. 1B, and VII (a), (b) to IX (a), (b) of FIG. 1C, and X (a), (b) of FIG. 1D. In the state where the fixing jig 16 is inserted into the upper part of the inserted wall foundation reinforcing bar 2 and fixed again, a new reinforcing frame 4 is added to the upper side of the wall basic reinforcing bar 2 and the upper reinforcing frame is added. 4, each step of the vertical reinforcing bar attaching step (2) to the reinforcing bar rod inserting step (4) is performed. Here, when the upper and lower reinforcing frame bodies 4 are connected to each other, the upper end portion of the lower reinforcing frame body 4 has a blank portion where the vertical reinforcing bar panel 6 and the strand 8 are not attached over a predetermined height. Since it is formed, the connection work with the upper reinforcing frame 4 can be performed easily and smoothly. Further, in the vertical reinforcing bar attaching step in this additional insertion step, the lower end portion of the newly added vertical reinforcing bar panel 6 is connected to the upper end portion of the vertical reinforcing bar panel 6 of the wall foundation reinforcing bar 2 already inserted into the lower excavation hole 12. On the other hand, it is made into a lap joint and is mounted across the lower reinforcing frame 4 and the newly added reinforcing frame 4. Similarly, the newly added strand 8 is wound with the start end of the lower strand 8 being overlapped with the end of the lower strand 8, and the insertion work of the wall foundation reinforcing bar 2 is performed in parallel with the winding of the strand. . Then, this additional insertion process is repeated a desired number of times, and the wall foundation rebar bar 2 is inserted to a desired depth.

<< (6) Concrete placing process >>
As shown in X (a), (b) to XII (a), (b) of FIG. 1D, when the wall foundation rebar 2 is inserted to a desired depth and the descent is completed, the inserted wall foundation reinforcement rod In the state where the fixing jig 16 is inserted and fixed again on the upper part of 2, the erection machine 14 and the strand winding machine 10 are removed, and an unnecessary part at the upper end of the reinforcing frame 4 is further removed, 20 is built and concrete is placed in the excavation hole 12.

  Therefore, according to the wall foundation rebar of this embodiment and the construction method thereof as described above, the wall foundation reinforcement bar 2 is assembled and built on the excavation hole 12 at the construction site. There is no need to secure a wide space for assembling and manufacturing the wall foundation rebar rod 2 in the yard as in the prior art. Moreover, since it is not necessary to move the wall foundation rebar bar 2 from the assembly production position to the built-in position, the moving space and a large crane for movement are not required. A small clay that can be lifted will suffice.

  Furthermore, since the assembly and erection of the wall foundation reinforcing bar 2 are alternately performed in parallel, the member connection work such as the upper and lower reinforcing frame bodies 4 and 4 at the time of addition is incorporated into the assembly work. It can be a safe and workable environment. Moreover, since the wall foundation rebar 2 is manufactured by winding the strand 8 of the PC steel wire as the band rebar, the work is easy and the construction speed can be improved as much as possible. In addition, the winding process of the strand 8 and the insertion process of the reinforcing bar 2 are performed in parallel, and the wall foundation reinforcing bar 2 is lowered while winding the strand 8, so that the construction can be efficiently performed. It will be possible to shorten as much as possible.

  Of course, the present invention is not limited to the wall foundation rebars of the embodiment described above, but can also be applied to cast-in-place piles or underground continuous walls.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic process figure which shows the assembly and installation procedure of the reinforcing bar cage concerning this invention, I shows the installation process of a lowermost reinforcement frame body, II shows the installation process of a reinforcing bar panel, III shows the installation process of a strand winding machine, respectively. . It is a general | schematic process figure same as the above, IV shows the initial stage of a strand winding process, V shows a winding & reinforcing bar lowering process, VI shows a winding machine removal process, respectively. The schematic process diagram shows the step of adding, VII shows the step of adding the reinforcing frame, IIX shows the step of adding the vertical reinforcing bar panel, and IX shows the step of winding the strand and lowering the reinforcing bar rod. It is a general | schematic process figure same as the above, X shows the completion | finish time of an addition insertion process, XI shows the unnecessary part removal process of a reinforcement frame, and XII shows a concrete placement process, respectively.

Explanation of symbols

2 Reinforcing bar foundation 4 Reinforcement frame 4a Vertical member 4b Horizontal member 6 Vertical reinforcing panel 6a Vertical reinforcing bar
6b Horizontal reinforcing bar 8 Strand 10 Winding machine 12 Drilling hole 14 Installation machine 16 Fixing jig 18 Mounting table 20 Tremy tube

Claims (5)

  Reinforcing bar that is assembled and built on the excavation hole at the construction site, the reinforcing frame formed by assembling the vertical and cross members, and the reinforcing frame that is formed by being assembled in a substantially flat shape in advance. A reinforcing bar rod comprising: a vertical reinforcing bar panel fastened to the outer periphery of the frame; and a strand spirally wound around the outer side of the vertical reinforcing bar panel. A method for building a reinforcing bar that is assembled and built on an excavation hole in a construction site, and includes the following steps (1) to (6).
(1) A reinforcing frame body installation step in which a reinforcing frame body formed by assembling vertical members and cross members is fixed and installed by a fixing jig provided so as to be removable over the top of the excavation hole.
(2) A vertical reinforcing bar attachment step in which a vertical reinforcing bar panel formed in advance in a substantially flat shape is fixedly attached to the outer peripheral portion of the temporarily placed reinforcing frame.
(3) A strand attachment process in which a strand is spirally wound and fixed to the outside of the vertical reinforcing bar panel fixed to the reinforcing frame.
(4) After removing the fixing jig while supporting the reinforcing bar made up by winding and fixing the strand with the wire of the built-in machine arranged on the side of the top of the excavation hole, the excavation hole Reinforcing bar scissors insertion process that inserts and descends to a predetermined depth.
(5) With the fixing jig inserted into the upper part of the inserted reinforcing bar rod and fixed again, a new reinforcing frame is added to the upper side of the reinforcing bar rod, and A reinforcement insertion step in which the steps of the vertical rebar installation step 2) to the rebar rod insertion step (4) are sequentially performed.
(6) A concrete placing step in which concrete is placed in the excavation hole in a state where the fixing jig is inserted into the upper portion of the reinforcing bar inserted to a desired depth and fixed again.   The method of building a reinforcing bar rod according to claim 2, wherein the strand attaching step (3) and the reinforcing rod insertion step (4) are performed in parallel.   The method of building a reinforcing bar rod according to any one of claims 2 and 3, wherein the winding and fixing of the strand is performed by using a strand winding machine that is detachably provided on the top of the reinforcing frame. The vertical reinforcing bar panel is attached by positioning its upper end part below the upper end part of the reinforcing frame by a predetermined height. Method.

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