JP4795224B2 - Alignment jig for concrete product and assembly method using the same - Google Patents

Description

  TECHNICAL FIELD The present invention relates to an alignment jig used when assembling a concrete product divided into upper and lower parts on the site and the like, and a method for assembling a concrete product using the same.

  Conventionally, large concrete hand holes, etc., are manufactured by dividing them into multiple units in consideration of manufacturing at the factory and transportation to the site, which are taken to the site and assembled into products on the site. There is. For example, if the hand hole is divided into upper and lower units, excavate the ground to make holes, lift the lower unit with a crane, etc., install it in the hole, and then lift the upper unit with a crane, etc. Set while lowering on the lower unit.

  In hollow concrete products such as handholes, when setting the upper unit to the lower unit, it is necessary to prevent the connecting portion from shifting. Therefore, when lowering the upper unit with a crane, the upper unit must be accurately lowered and connected to the lower unit that has been installed. You must hold it down, align it and lower it down. At that time, an operator may put his hand between the lower unit and the upper unit, or put a hand between the wire and the unit that suspends the upper unit. There was a risk of being hit by a worker, and it was a dangerous work requiring extremely skill. In addition, this work required at least two workers, one who operates the crane, one who performs positioning, and the other.

  Therefore, when the upper unit is installed on the installed lower unit, an alignment tool is provided on each side surface of the lower unit, and the alignment tool has a guide surface that is opened upward on the outer side. When the upper unit is lowered by a crane, the lower end of the upper unit is guided by the guide surface of the alignment tool, and the upper unit is accurately joined to the lower unit. An alignment tool and an assembly method using the same have been developed.

JP 7-317090 A

However, the alignment tool shown in Patent Document 1 is such that the upper part of a flat plate is inclined outward to form a protruding portion, and the inner surface of the protruding portion is used as a guide surface. Since it is attached to the center of each of the four side surfaces of the lower unit made of the product, if the upper unit is lowered, there is a risk that the upper unit and the lower unit will be displaced even if these aligning tools are present. Moreover, since the protrusion part which has the guide surface of each alignment tool is a thing which just bent the flat plate, intensity | strength is weak and there exists a possibility that it may deform | transform when an upper unit collides strongly.
Further, since the guide surface of each alignment tool is a flat plate, even if the lower end of the upper unit hits this guide surface, it may be caught at the abutted portion and may not come down smoothly.

  Therefore, the present invention takes the above-mentioned prior art into consideration, and when assembling each unit in which a concrete product such as a handhole is separated into a plurality of units, the upper unit is placed above the installed lower unit. Provided is an alignment jig capable of reliably guiding an upper unit to an accurate position when hanging down with an upper unit and the like, and a method for assembling a concrete product using the same. Is a solution.

In order to achieve the above object, the invention of claim 1 is an alignment jig used when assembling a concrete product by stacking a plurality of concrete units up and down, and the alignment jig has substantially four sides. One side of the shaped plate-like support is bent at a substantially right angle to form a bent piece, and one side of the support having the bent piece and the upper edge of the corner formed by the bent piece are perpendicular to each other. Positioned guide pieces are provided, these guide pieces project upward and outward, and arc-shaped guide pieces are provided from the upper edge of the support at a distance from the guide pieces. Protruding, providing a hole or notch in the support, aligning the hole or notch in the support with the insert on the side of the lower unit, and screwing the bolt into the insert to attach the support to the lower unit side When attached, the bent piece of the support is bent at a right angle along the upper corner of the lower unit, and the guide piece and the arcuate guide piece protrude upward and outward from the upper edge of the lower unit. The alignment jig is a configuration.

According to a second aspect of the present invention, in the first aspect of the present invention, each guide piece is provided with a support bar that extends from the back to a lower support, and the arcuate guide piece is a bent piece at one side edge thereof. An alignment jig having

  Further, the invention of claim 3 is a method of assembling a concrete product by stacking a plurality of units made of concrete up and down, and the positioning jig of claim 1 or 2 is provided on each of the opposing side surfaces of the lower unit. It is attached to the insert location, so that two guide pieces that are perpendicular to each other in each alignment jig are positioned outside the corners of the lower unit, respectively, and the arcuate guide pieces are positioned outside the side surfaces of the lower unit. The upper unit is lifted above the lower unit equipped with the alignment jig, and the upper unit is lowered while surrounded by the guide pieces and arcuate guide pieces of the alignment jigs. It was.

  When the invention of claim 1 is used, since there are two guide pieces perpendicular to each other along the adjacent side surfaces of each corner of the lower unit, the suspended upper unit has corners at the four corners of the lower end. Are guided by the set of two guide pieces and guided to an accurate position. Therefore, the upper unit can be reliably connected to a predetermined location of the lower unit. In addition, since each side has an arcuate guide piece, the lower end edge of the upper unit can come down smoothly along the curved surface of each arcuate guide piece, and the lower end edge of the upper unit is a guide. There is no possibility of troubles such as being caught on a piece and not getting off.

  In addition, the alignment jig uses an existing insert on the side surface of the lower unit used when connecting the upper unit and the lower unit, and converts the support body bent at a right angle to the lower unit. Since it is attached, it can be securely and firmly attached to a predetermined place with one bolt, and the attachment can be performed easily and quickly. In addition, since the inserts on the side surfaces of the upper and lower units have a constant distance from both side edges of the side surface regardless of the size of the hand hole, the alignment jig of the present invention can be of any size of the hand hole. Can also be used for, versatile.

  In addition to the above effect, the invention of claim 2 is provided with a support bar on the back surface of each guide piece, and has a bent edge along one side edge of the arcuate guide piece. In addition, the strength of the arcuate guide piece is high, and even if the upper unit descends while swinging left and right and hits the guide piece or the arcuate guide piece strongly, the guide piece or the arcuate guide piece is not deformed.

  According to the invention of claim 3, in addition to the above effect, the upper unit can be accurately attached to a predetermined position of the lower unit without the intervention of an operator. Therefore, it can be quickly installed without putting the worker in danger, and the assembly efficiency is high. That is, the upper unit is suspended above the lower unit on which the alignment jig is mounted, and the upper unit is lowered while surrounded by the guide piece and the arc-shaped guide piece of each alignment jig. The upper unit, guided by the alignment jigs at the four corners, is automatically connected to a predetermined position of the lower unit automatically. Therefore, unlike the conventional case, in assembling, the upper unit is not manually guided by an operator and connected to the lower unit. Therefore, the assembly work can be performed safely, accurately and quickly.

The present invention relates to an alignment jig used when assembling a concrete product by stacking a plurality of concrete units vertically, and the alignment jig is provided on one side of a substantially quadrangular plate-like support. The guide pieces are provided at right angles to each other from one side of the support body having the bent pieces and the upper edge of the corner formed by the bent pieces. The piece protrudes upward and outward, and an arcuate guide piece is provided from the upper edge of the support body at a distance from the guide piece. The arcuate guide piece protrudes upward and outward, and a hole or notch is formed in the support body. When the support is attached to the side of the lower unit by aligning the hole or notch of the support with the insert on the side of the lower unit and screwing the bolt onto the insert, Occasionally The piece is a right angle along the upper corner of the lower unit, and the guide piece and the arcuate guide piece are an alignment jig that protrudes upward and outward from the upper edge of the lower unit. The upper unit can be reliably and easily connected to the lower unit.

  FIG. 2 shows an alignment jig 1 according to the present invention. The alignment jig 1 is provided with two angle members 2 arranged vertically at intervals, and one angle member 2 has its bent piece positioned rearward. The other angle member 2 has its bent piece positioned forward, and two horizontal angle members 3 are provided above and below the front of these angle members 2 with a gap between them. A quadrilateral cutout 4 is provided at the lower edge, and the support 5 is formed of the above members.

  From the upper edge of each piece of the one angle member 2, plate-like guide pieces 6, 6 positioned at right angles to each other are provided integrally with each piece, and each of these guide pieces 6 is formed of the one angle member 2. 2 projecting outward from the upper side. Further, an arcuate guide piece 7 in which one piece forming the front surface of the angle member 2 is curved upward and forward is provided from the upper edge of the other angle member 2. A bent edge 7a is provided on the side edge. The bent edge 7 a is formed by making a plurality of cuts from the outer edge and bending it along the arcuate guide piece 7.

  Further, one end of each support bar 8 is fixed to the back surface of each guide piece 6, and the other end is fixed to the upper horizontal angle member 3 and the other to the vertical angle member 2.

  FIG. 5 is an assembly front view of the hand hole 10 using the present invention. The hand hole 10 is divided into upper and lower units 10a and 10b, and the upper and lower units 10a and 10b are connected to each other by connecting fittings 11 through inserts provided on the respective side surfaces. It is united. Therefore, when assembling such a hand hole 10 on site, the lower unit 10b is first lifted by a crane and lowered to a predetermined position for installation. At that time, although not shown in the drawings, eyebolts are screwed onto the inserts on the respective side surfaces of the lower unit 10b, wires are hung on these eyebolts, and they are lifted by a crane.

  After that, as shown in FIG. 2, each eyebolt of the lower unit 10b is removed, the support 5 of the alignment jig 1 is applied to the side corner, the notch 4 is aligned with the insert 12, and the washer 13 is attached. The mounted bolt 14 is screwed to the insert 12. As a result, the bent piece of the one angle member 2 of the support 5 is superposed on the adjacent side edge along the corner of the lower unit 10b. In this way, the support 5 of the alignment jig 1 is attached to each insert 12 on each side surface of the lower unit 10b.

  As a result, the guide piece 6 and the arcuate guide piece 7 of each alignment jig 1 protrude upward and outward from the upper edge of the lower unit 10b as shown in FIG. FIG. 3 is a plan view of the lower unit 10b in this state. In this way, the guide piece 6 and the arcuate guide piece 7 of each positioning jig 1 are provided outside the four corners of the lower unit 10b and are opened outward.

  Then, similarly to the lower unit 10b, as shown in FIG. 1, eyebolts 15 are screwed onto inserts on the respective side surfaces of the upper unit 10a, and sling wires 16 are hung on these eyebolts 15 with a crane 17. It is lifted above the lower unit 10b, and the upper unit 10a is lowered from there.

At that time, first, the corners at the lower ends of the upper unit 10a are guided by the two guide pieces 6 positioned at right angles of the four corners. Next, when the crane 17 is lowered, the upper unit 10a is shown in FIG. As shown in FIG. 2, the guide is guided by the curved surface of each arcuate guide piece 7 and descends directly above the lower unit 10b to be connected at an accurate position.
At that time, even if the lower end of the upper unit 10a hits each arcuate guide 7, each arcuate guide piece 7 is curved, so that the upper unit 10a is smoothly guided to the predetermined position without being caught by the contact portion. Fall to the position of.

  In addition, each arcuate guide piece 7 has a bent edge 7a on one side thereof, and the upper unit 10a is provided with an arcuate guide piece 7 because the bent edge 7a is provided with cuts from a plurality of locations on the outer edge. When the curved surface is touched, the gaps of the cuts of the bent edge 7a are compressed and the arcuate guide pieces 7 are opened to the outside. Immediately thereafter, the bent edge 7a is repelled by elasticity, and each circle The arcuate guide piece 7 pushes back the upper unit 10a, and the upper unit 10a is guided and dropped directly above the lower unit 10b by two arcuate guide pieces 7 on each side.

  The structure of the support for the alignment jig according to the present invention is not limited to that of the above embodiment, and may be a substantially quadrangular plate.

It is a side view which shows the assembly condition of the upper and lower units of the concrete product of this invention. It is a perspective view which shows the state which attaches the alignment jig | tool of this invention to a lower unit. It is a top view of the lower unit equipped with the alignment jig of the present invention. It is explanatory drawing which shows the state which has dropped the upper unit on the lower unit of this invention. It is an assembly side view of a handhole using this invention.

Explanation of symbols

In the figure, 1: positioning jig, 2: angle material, 3: horizontal angle material,
4: notch, 5: support, 6: guide piece, 7: arcuate guide piece,
8: Support rod, 10: Hand hole, 10a: Upper unit,
10b: Lower unit, 11: Connecting bracket, 12: Insert,
13: Washer, 14: Bolt, 15: Eye bolt,
16: sling wire, 17: crane

Claims (3)

A positioning jig used when assembling a concrete product by stacking a plurality of units made of concrete up and down,
The alignment jig is formed by bending one side of a substantially quadrangular plate-like support body at a substantially right angle to form a bent piece, and one side of the support body having the bent piece and the bent piece. Guide pieces located at right angles to each other from the upper edge of the corner are provided, these guide pieces protrude upward and outward, and an arcuate guide piece is provided from the upper edge of the support member at a distance from the guide piece, The arcuate guide piece protrudes upward and outward, and a hole or notch is provided in the support,
When the hole or notch of the support is aligned with the insert on the side of the lower unit and a bolt is screwed onto the insert to attach the support to the side of the lower unit, the bent piece of the support Is aligned at a right angle along the upper corner of the lower unit, and the guide piece and the arc-shaped guide piece protrude from the upper edge of the lower unit upward and outward. jig. The alignment jig according to claim 1, wherein each guide piece is provided with a support bar that extends from the back to a lower support, and the arcuate guide piece has a bent piece on one side edge thereof. Ingredients. In a method of assembling a concrete product by stacking a plurality of concrete units up and down,
The alignment jig according to claim 1 or 2 is attached to each insert portion on the opposite side surface of the lower unit so that the two guide pieces perpendicular to each other in each alignment jig are the corners of the lower unit. So that each of the arcuate guide pieces is located outside the side surface of the lower unit.
The upper unit is lifted above the lower unit on which the alignment jig is mounted, and the upper unit is lowered while surrounded by the guide piece and the arcuate guide piece of each alignment jig. How to assemble concrete products.

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