JP2009299419A - Construction method for preventing displacement of form, and installment tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method and an installation tool for preventing a form of a light-weight steel pipe from displacement and enhancing horizontality and stability in installation of the form of the light-weight steel pipe while a space for embedding a post-constructed anchor bolt can correctly be placed in a position as planned in a concrete foundation. <P>SOLUTION: The construction method, which prevents the form 20 of the light-weight steel pipe used in post-construction of the concrete foundation from displacement, is composed of the following steps: a step for arranging the form 20 of the light-weight steel pipe in a prescribed position, a step for detachably mounting the form 20 of the light-weight steel pipe on an undisplaceable tool 1, a step for attaching the undisplaceable tool 1 on a concrete form 40 of the concrete foundation, a step for casting the concrete in the concrete form 40 excluding the inner part of the form 20 of the light-weight steel pipe, and a step for removing the undisplaceable tool 1 from the form 20 of the light-weight steel pipe and the concrete form 40 after the concrete is hardened. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a method for preventing misalignment of a lightweight steel pipe form and a construction jig for forming a space for embedding a post-construction anchor bolt for installing a mechanical device or the like on a concrete foundation.

  In general, in order to improve the proof strength of steel column bases, as an example of installing a square frame steel pipe as a box-shaped formwork on the foundation beam, the main bars for forming the foundation beam, reinforcing bars such as the stirrups are arranged, At the position where the column base is to be embedded, a box-shaped form of a square steel pipe is joined to the main reinforcement of the foundation beam by welding, etc., and then the concrete is cast to complete the foundation beam, and then the steel column is anchored to the anchor mounting plate There is a type in which post-cast concrete having a higher strength than concrete for foundation beams is placed in a space portion of a formwork steel pipe after being temporarily fixed in place (see, for example, Patent Document 1).

JP 63-165626 A

  In particular, in the construction of a thermal power plant or the like, the following post-construction method is performed in the construction of anchor bolts for fixing various mechanical devices and the like to a concrete foundation. First, before placing the concrete foundation into the concrete, a lightweight steel pipe formwork is placed at the anchor bolt installation position and temporarily fixed to the reinforcing bar of the concrete foundation. After that, concrete is cast, and after the concrete foundation is completed, the lightweight steel pipe formwork is left on the concrete foundation. Next, anchor bolts are temporarily placed in the space of the mold of the lightweight steel pipe, and a filler is placed in the space to be hardened. Thereby, an anchor bolt can be post-constructed on a concrete foundation.

  In the post-construction method described above, there is a problem that the position shift of the lightweight steel pipe form appears due to the influence of concrete placement. This is because the flow pressure of fluid concrete generated during concrete pouring and the pressure generated by the uniform leveling work of concrete after pouring shift the setting position of the formwork of lightweight steel pipes, the levelness of the formwork, etc. It is a thing that ends up.

In order to prevent the misalignment of the mold of the lightweight steel pipe, it is conceivable to perform a strong binding between the mold and, for example, a reinforcing bar, but this is difficult for the following reasons.
(1) The part which binds the formwork of a light-weight steel pipe and the reinforced bar is limited.
(2) Since the operation of heating the rebar such as welding is avoided from the viewpoint of the strength of the frame, when welding the light steel pipe and the rebar as a formwork, only temporary fixing welding can be performed to the minimum part.

  Furthermore, the lightweight steel pipe used as a formwork has a thin plate thickness of about 0.5 to 1.6 mm, and is light as the name suggests.

  In the post-construction method, a lightweight steel pipe formwork is left on the concrete foundation, and anchor bolts are buried in the space of the lightweight steel pipe formwork. Therefore, if the lightweight steel pipe formwork cannot be installed and constructed at a predetermined position, the anchor bolt cannot be embedded, and in the worst case, there is a possibility that the mechanical device cannot be installed on the concrete foundation.

  The present invention has been made based on the above-mentioned matters, and its purpose is to prevent the displacement of the form of the lightweight steel pipe, and to improve the horizontality and stability of the installation of the lightweight steel pipe, It is intended to provide a construction method and a construction jig capable of correctly installing and constructing a space portion for post-construction anchor bolt embedding on a concrete foundation at a position as designed.

  (1) In order to achieve the above object, the present invention is a construction method for preventing displacement of a lightweight steel pipe formwork used in concrete foundation post-working, wherein the lightweight steel pipe formwork is set at a set position. A procedure for arranging, a procedure for detachably attaching the lightweight steel pipe formwork to a misalignment prevention construction jig, a procedure for attaching the misalignment prevention construction jig to a concrete formwork of the concrete foundation, and a formwork of the lightweight steel pipe A step of placing concrete in a concrete formwork excluding the inside of the steel sheet, and a step of removing the misalignment prevention construction jig from the formwork of the lightweight steel pipe and the concrete formwork after the concrete is solidified. Is.

(2) In order to achieve the above object, the present invention is a construction method for preventing the displacement of the formwork of the lightweight steel pipe used in the post-construction of the concrete foundation, and a procedure for arranging the reinforcing bars for the concrete foundation. , A procedure for placing the lightweight steel pipe mold in an anchor bolt setting position, a procedure for attaching a fixture of a misalignment prevention construction jig to the mold of the lightweight steel pipe, and a side outer periphery of the reinforcing bar A procedure for attaching a concrete formwork for a concrete foundation, a procedure for attaching a support material for the misalignment prevention construction jig to the concrete formwork, and a fixture for the misalignment prevention construction jig to the support material for the misalignment prevention construction jig. Installation procedure,
A procedure for placing concrete inside the concrete formwork excluding the inside of the lightweight steel pipe formwork, and after the concrete is solidified, the misalignment prevention construction jig is used as the lightweight steel pipe formwork and the concrete mold. And a procedure for removing from the frame.

  (3) In order to achieve the above object, the present invention is a construction tool for preventing displacement of a lightweight steel pipe form used in the post-construction of a concrete foundation, and is a space portion in which an anchor bolt is embedded in the concrete foundation. A lightweight steel pipe formwork, a support material that spans the concrete formwork and places the lightweight steel pipe formwork in a predetermined position, and the support material and the lightweight steel pipe formwork are detachable And a fixture for fixing the connection.

  (4) In the above (3), preferably, the fixture is configured by pressing the inner side of the mold of the lightweight steel pipe with a main shaft that provides a male screw part screwed to the support member to the upper part by a pressing member. And a pressing mechanism portion for holding and fixing.

  According to the present invention, in the installation of a lightweight steel pipe form for forming a space for embedding a post-construction anchor bolt, the horizontality and stability can be improved, so that the post-construction anchor is placed at the position as designed. The space for burying bolts can be correctly installed on the concrete foundation. As a result, the installation property of the mechanical device on the concrete foundation can be improved.

Below, one Embodiment of the construction jig used for the position shift prevention construction method of the formwork of this invention is described using drawing.
1 to 4 show an embodiment of a method for preventing misalignment of a mold and a construction jig according to the present invention, and FIG. 1 shows a method for preventing misalignment of a mold and a construction jig according to the present invention. FIG. 2 is a plan view showing an embodiment, FIG. 2 is a cross-sectional view of the method for preventing misalignment of a formwork and a construction jig of the present invention shown in FIG. FIG. 4 is a side view for explaining a fixing tool constituting the misalignment prevention construction tool of the present invention shown in FIG. 1. It is.

  As shown in FIGS. 1 to 3, the construction jig used in the method for preventing misalignment of a formwork according to the present invention is used in, for example, a post-construction method that is performed at the time of construction of a thermal power plant or the like. Is.

First, a concrete foundation forming member will be described.
In FIG. 1 to FIG. 3, in order to form a substantially rectangular parallelepiped concrete foundation on a ground (not shown) on which discarded concrete is laid, a reinforcing bar 10 is arranged in a vertical and horizontal direction with a predetermined dimension. . Moreover, the concrete formwork 40 which has the plate-shaped member 41 of 4 sheets of substantially rectangular planar views is arrange | positioned so that the outer periphery of the side surface 4 direction of the reinforcing steel bar 10 arranged.

  The concrete mold 40 is mainly composed of the plate-like member 41 which is a slat directly supporting the placed concrete and a support (not shown) for supporting these plate-like members 41 from the outside. . As the plate-like member 41, a wooden panel, a steel panel, or the like can be used in addition to a veneer plywood or a steel plate, and a square member (end thick), a pipe, a steel plate, or the like is used as a support work.

  In order to fix and bind together the plate-like members 41 of the concrete mold 40, a mold auxiliary material 50 made of, for example, a small-diameter steel pipe is provided on the outer periphery of the concrete mold 40. The formwork auxiliary material 50 for fixing the short side (the left and right sides in FIG. 1) of the concrete mold 40 and the formwork auxiliary material 50 for fixing the long side (upper and lower sides in FIG. 1) of the concrete form 40 In a place where the two intersect, for example, a fastening member 51 such as a watch is integrally fastened. In this way, the formwork auxiliary material 50 tightly fixed to fix the outer periphery of the concrete formwork 40 is disposed at the substantially vertical center of the concrete formwork 40 as shown in FIG.

Next, a description will be given of a jig for preventing displacement of the formwork.
As shown in FIG. 1 to FIG. 3, the construction jig 1 is a plate of lightweight steel pipe molds 20, 20, 20 that form a space for embedding anchor bolts in a concrete foundation and an opposing concrete mold 40. A support material 60 that is spanned between the shaped members 41 and 41 to place the lightweight steel pipe molds 20, 20, 20 at predetermined positions, and the support material 60 and the lightweight steel pipe molds 20, 20, 20. Fixtures 30, 30, and 30 for connecting and fixing are provided.

  The lightweight steel pipe mold 20 is a mold for forming a space for embedding anchor bolts in a concrete foundation, and is left on the concrete foundation. Therefore, it is necessary to select a lightweight steel pipe having a cross-sectional shape corresponding to the shape of the space portion to be formed. In this embodiment, a circular tube having a diameter of about 30 cm is used to form a circular space.

  As shown in FIG. 1, the support member 60 includes one long support member 61 and three short support members 62 arranged to intersect the long support member 61 at a right angle in the horizontal direction. ing. Further, fixing tool mounting holes 63 for connecting a fixing tool 30 to be described later are provided at the center of the intersecting portion of the long support material 61 and the three short support materials 62, respectively. Furthermore, attachment holes 64 and 64 for fixing to the concrete mold 40 are provided at both ends of these support materials, respectively. As the long support material 61 and the three short support materials 62, for example, a steel pipe having a rectangular cross section having a double pipe mechanism whose surface is rust-proofed is used.

  The support material 60 is attached to the concrete mold 40 by attaching a long support 61 to the center of the upper surface of the plate-like members 41, 41 on the short side (left and right sides in FIG. 1) of the concrete mold 40. Fastened with 70 and fixed. Further, the three short support members 62 are provided with six bolts 70 via support members 65 at predetermined portions on the upper surfaces of the plate-like members 41 on the long side (upper and lower sides in FIG. 1) of the concrete mold 40. It is fixed by tightening with.

  The fixture 30 is generally disposed at a main shaft 31 that is a steel rod-like member and an axially lower portion of the main shaft 31, and in order to hold the light steel pipe mold 20, the lightweight steel pipe mold 20. And a pressing mechanism portion 32 that presses the inner side.

  A male screw portion 31 a is formed on the upper portion of the main shaft 31, and the male screw portion 31 a protrudes through the fixture attachment hole 63 of the support member 60. Fixing nuts 71, 71 are fastened to the male screw portion 31 a so as to sandwich the support material 60. As a result, the fixture 30 is firmly fixed to the support member 60.

  As shown in FIG. 2, the pressing mechanism portion 32 expands the diameter of the upper rod 32b and the lower rod 32c, so that the pressing plate 32d presses the inner surface of the lightweight steel pipe mold 20 outward. . By making this pressing force larger than the weight of the lightweight steel pipe mold 20, the lightweight steel pipe mold 20 is fixed to the fixture 30. As a result, the lightweight pipe form 20 is fixed and set at the position of the fixture 30 arranged by the support material 60.

Next, the pressing mechanism portion 32 of the fixture 30 that constitutes the above-described jig 1 for preventing misalignment of the form of the present invention will be described in detail with reference to FIG.
An attachment disk 32e is formed in the lower part of the main shaft 31, and four lower attachment members are fixed to the upper surface of the attachment disk 32e at equal intervals in the circumferential direction. The other end of the lower rod 32c is rotatably supported by the lower mounting member. An operating short tube 32a is slidably fitted to the main shaft 31, and four upper mounting members are fixed to the outer peripheral surface of the operating short tube 32a at equal intervals in the circumferential direction. The other end of the upper rod 32b is rotatably supported by the upper mounting member. The upper end (one end) of the lower rod 32c and the lower end (one end) of the upper rod 32b corresponding to the lower rod 32c are rotatably connected, and the lower rod 32c and the upper rod 32b are joined at one end. The link member is configured. A rectangular pressing plate 32d (pressing member) is attached to the knot portion of each link member.

  A fixing hole 32f penetrating in the radial direction from one side to the other side is provided in the upper portion of the working short tube 32a. A plurality of fixing holes 31b, which coincide with the fixing holes 32f, are formed in the upper part of the main shaft 31 in the vertical direction so as to penetrate in the radial direction. The operating short pipe 32a is slid down so that the fixing hole 32f and one fixing hole 31b are aligned with each other, and a fixing pin (not shown) is inserted into the fixing hole 32f and the fixing hole 31b. The plate 32d group is held in a large diameter state with an appropriate diameter. In order to make it into a small diameter state, the fixing pin is pulled out and the working short tube 32a is slid up.

Next, an embodiment of a method for preventing misalignment of a mold according to the present invention will be described using the jig for preventing misalignment of a mold configured as described above.
First, reinforcing bars 10 such as main bars and ribs for forming a concrete foundation on a ground (not shown) on which abandoned concrete is laid are arranged vertically and horizontally in a predetermined dimension. Next, the mold 20 of the lightweight steel pipe is placed upright at a position where a space portion for embedding anchor bolts is formed.

  Next, the fixture 30 is inserted into the inside from the upper opening of the mold 20 of the lightweight steel pipe. At this time, the operating pin 32a is slid up by pulling out the fixing pin of the pressing mechanism 32, and the rods 32b and 32c of the pressing mechanism 32 are reduced in diameter. Next, the fixture 30 is arranged so that the upper portion of the main shaft 31 is at an appropriate position, and at this position, the pressing plate 32d of the pressing mechanism portion 32 appropriately presses the inside of the mold 20 of the lightweight steel pipe. Manipulate. Specifically, the operating short tube 32a is slid down, and a fixing pin is inserted at a position where an appropriate diameter can be obtained to fix the operating short tube 32a.

  Next, a concrete formwork 40 of a concrete foundation assembled with a plate-like member 41 such as a veneer plywood is attached to the outer periphery of the reinforcing bar 10 in the side surface 4 direction, and the outer periphery of the plate-like member 41 of this concrete formwork 40 is attached. Fix with the formwork auxiliary material 50.

  Next, the support material 60 is passed between the plate-like members 41 and 41 of the concrete mold 40 facing each other. At this time, the male screw portion 31a of the main shaft 31 of the fixture 30 inserted and arranged inside the lightweight steel pipe mold 20 is arranged so as to pass through the fixture attachment hole 63 of the support material 60. In FIG. 1, the support members 60 are arranged so that the upper center of the main shaft 31 of the fixture 30 matches the center of the intersecting portion of the long support member 61 and the short support member 62. Next, the fixing nuts 71, 71 are tightened in such a manner that the upper and lower sides of the support material 60 are sandwiched in the male thread portion 31 a of the main shaft 31 inserted through the fixture attachment hole 63 of the support material 60. Thereby, the support member 60 and the fixture 30 are connected and fixed. Further, the support members 61 and 62 are fixedly attached to the plate-like member 41 of the concrete mold 40 by inserting bolts 70 and 70 into the mounting holes 64 and 64 provided at both ends and tightening them.

  Next, the concrete is placed inside the concrete mold 40 except for the inside of the lightweight steel pipe mold 20.

  After the concrete is solidified, the connection and fixing between the lightweight steel pipe mold 20 and the fixture 30 is released. Specifically, by pulling out the fixing pin of the pressing mechanism portion 32, the operating short tube 32a is slid up and the rods 32b, 32c of the pressing mechanism portion 32 are reduced in diameter. Thereafter, the support material 60 is removed from the plate-like member 41 of the concrete mold 40, and the fixture 30 is also removed from the support material 60. Furthermore, the concrete mold 40 is also removed from the concrete foundation. The lightweight steel pipe mold 20 is left in the concrete foundation.

  Next, anchor bolts are placed in the space formed by the mold 20 of the lightweight steel pipe, and anchor bolt fixing filler having higher strength than the concrete foundation is placed. Thereby, an anchor bolt can be post-constructed on a concrete foundation. Installation of the mechanical device or the like is performed by attaching the mechanical device or the like to the anchor bolt after the anchor bolt fixing filler is solidified.

  According to one embodiment of the method for preventing misalignment of a formwork of the present invention, in the installation of a lightweight steel pipe formwork for forming a space for embedding a post-construction anchor bolt, its horizontality and stability are improved. Since the height can be increased, the space for post-construction anchor bolt embedding can be correctly installed on the concrete foundation at the position as designed. As a result, the installation property of the mechanical device on the concrete foundation can be improved. In addition, a large-diameter lightweight steel pipe mold 20 that has been used in consideration of construction errors is no longer necessary, and a lightweight steel pipe mold 20 having an appropriate diameter is used to embed anchor bolts for post-installation anchor bolts. Can be formed. As a result, the usage amount of the anchor bolt fixing filler used in the post-construction can be reduced.

  Furthermore, the placement setting of the lightweight steel pipe mold 20 that has been performed only by a reinforcing bar supplier can be performed by setting the position of the support material passed to the concrete foundation mold by using the construction tool of the present invention. Therefore, it can be easily performed not only by a reinforcing bar supplier, but also by a construction company on a construction side such as a formworker or a concrete supplier. As a result, the concrete foundation installation work process can be shortened.

  Moreover, since the support material 60 of the construction jig 1 of the present invention uses a steel pipe having a double-pipe mechanism that can be expanded and contracted, the overall length can be adjusted according to the size of the concrete foundation. Thereby, the mounting property to the concrete formwork is improved and the working efficiency can be improved.

  In the present invention, the pressing mechanism 32 of the fixture 30 has been described as an example of a link mechanism, but is not limited thereto. Any mechanism may be used as long as the inner side can be pressed with a pressure equal to or higher than the weight of the lightweight steel pipe mold 20.

  Moreover, although demonstrated in the steel pipe which has a double pipe mechanism as the support material 60 of the construction jig 1, it is not restricted to this. For example, a steel plate may be used as long as it can be supported by a concrete formwork or the like.

It is a top view which shows one Embodiment of the position shift prevention construction method and construction jig of this invention. It is sectional drawing which looked at the position shift prevention construction method and construction jig of the formwork of this invention shown in FIG. 1 from the II-II arrow. It is a perspective view which shows one Embodiment of the position shift prevention construction method and construction jig of this invention. It is a side view explaining the fixing tool which comprises the position shift prevention construction jig of the formwork of this invention shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Construction jig 10 Reinforcing bar 20 Light steel pipe form 30 Fixture 31 Main shaft 31a Male thread part 32 Pressing mechanism part 32d Pressing member 40 Concrete formwork 50 Formwork auxiliary material 60 Support material 70 Bolt

Claims (4)

A construction method for preventing the displacement of the formwork of a lightweight steel pipe used in the post-construction of a concrete foundation,
A procedure for placing the lightweight steel pipe formwork at a set position;
A procedure for detachably attaching the lightweight steel pipe formwork to a misalignment prevention construction jig,
A procedure for attaching the misalignment prevention construction jig to the concrete formwork of the concrete foundation,
Placing concrete in the concrete formwork excluding the light steel pipe formwork; and
After the concrete has solidified, the misalignment prevention construction jig is removed from the mold of the lightweight steel pipe and the concrete mold, and
The construction method which prevents the position shift of the formwork of the lightweight steel pipe characterized by comprising. A construction method for preventing the displacement of the formwork of a lightweight steel pipe used in the post-construction of a concrete foundation,
Arranging the reinforcing bars for concrete foundation;
A procedure for placing the lightweight steel pipe frame in an anchor bolt setting position;
A procedure for attaching a fixture for preventing misalignment to the mold of the lightweight steel pipe,
A procedure for attaching the concrete formwork of the concrete foundation to the outer periphery of the side of the reinforcing bar,
A procedure for attaching a support material of the misalignment prevention construction jig to the concrete formwork,
A procedure for attaching the fixing tool of the misalignment prevention construction jig to the support material of the misalignment prevention construction jig,
Placing concrete in the concrete formwork excluding the light steel pipe formwork; and
After the concrete has solidified, the misalignment prevention construction jig is removed from the mold of the lightweight steel pipe and the concrete mold, and
The construction method which prevents the position shift of the formwork of the lightweight steel pipe characterized by comprising. It is a construction tool that prevents misalignment of the formwork of the lightweight steel pipe used in the post-construction of the concrete foundation,
A lightweight steel pipe mold that forms a space for embedding anchor bolts in the concrete foundation;
A support material that is passed over a concrete formwork and places the formwork of the lightweight steel pipe in a predetermined position;
A fixture for detachably connecting and fixing the support material and the lightweight steel pipe mold;
The construction jig which prevents the position shift of the formwork of the lightweight steel pipe characterized by comprising. In the construction jig which prevents position shift of the formwork of the lightweight steel pipe according to claim 3,
The fixing tool includes a main shaft that provides an upper portion with a male screw portion that is screwed to the support member,
A pressing mechanism portion that holds and fixes the inside of the lightweight steel pipe mold by pressing a pressing member; and
The construction jig which prevents the position shift of the formwork of the lightweight steel pipe characterized by comprising.

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