JP2012102564A - Main rope stretching fixture for secondary concrete product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a main rope stretching fixture for a secondary concrete product, which can be carried by a person's hands and which enables an operator to easily stretch the main rope on an upper part of the secondary concrete product.SOLUTION: A lower part of a pipe 10 is provided with an anchor bolt hook portion 20 which is hooked on an anchor bolt (hanger) having the pipe 10 preprovided in an erected attitude on the upper part of the secondary concrete product. In addition, a stand 30 and a pipe fixing bolt/nut 40, which are used to fix (locate) the pipe 10 in a position to make the bottom of the anchor bolt hook portion 20 properly hooked on a head of the anchor bolt, are provided.

Description

  The present invention relates to a master rope tensioning jig for a concrete secondary product, and particularly a master rope tensioning jig for a concrete secondary product that can be carried by a hand and allows an operator to easily stretch the master rope on the concrete secondary product. It relates to ingredients.

When the height of so-called concrete secondary products such as concrete pipes is 2m or more, since the work on the upper part of the concrete secondary product becomes a high place work after being installed at the site, the worker will work on the concrete secondary When working on the top of the product, it is necessary to take measures to prevent the worker from falling.
Conventionally, as a fall prevention measure, as shown in FIG. 6, two pipe installation holes are provided in the upper part of the concrete secondary product, and the pipes with the master rope through holes are set up in the respective holes. By passing the master rope through the master rope passage hole and hooking the safety rope of the worker on the master rope stretched between the pipes, the worker was prevented from falling. In addition, as shown in Fig. 7, so-called ton blocks, etc. in the shape of a rectangular parallelepiped are installed at two places on the concrete secondary product by crane, and a rope for master rope is wound around each ton block, and between ton blocks A worker's fall was prevented by hooking a worker's safety belt on the rope stretched on the rope.
By the way, when a concrete secondary product is reinforced by a reinforcing bar, there is known a parent rope supporter that uses a reinforcing bar protruding upward from a concrete surface to install a master rope for preventing a worker from falling down (patent) See literature 1 or 2.)
The master rope support tool includes a cylindrical member into which a reinforcing bar is inserted, a rope hook for supporting the master rope, and a fastening member that fixes the cylindrical member to the reinforcing bar.

Japanese Utility Model Publication No. 6-71773 JP-A-6-98945

When installing a master rope with two pipe installation holes in the upper part of the concrete secondary product, it is necessary to close the holes with mortar after the work is completed. Since the pipe installation depth is as deep as half the total length of the pipe, a considerable amount of mortar is required, which is not preferable from the viewpoint of work efficiency and work cost.
On the other hand, when a ton block or the like is installed on the upper part of the concrete secondary product and the parent rope is installed, a hoist such as a crane is separately required for installing and removing the ton block. Therefore, it takes time to install and remove the ton block, and as a result, it is not so preferable from the viewpoint of work efficiency and work cost, as in the case where the holes for installing the pipes are provided in two places.
Moreover, there is a problem that the master rope support using the reinforcing bar protruding upward from the concrete surface cannot be used unless a sufficiently long reinforcing bar protrudes upward from the concrete surface.
Therefore, the present invention was devised in view of the problems of the conventional worker's fall prevention jig, the purpose of which can be carried manually, and the worker is placed above the concrete secondary product. The object is to provide a master rope tensioning jig for a secondary concrete product that can be easily tensioned.

In order to achieve the above object, a master rope tensioning jig for a secondary concrete product according to claim 1 is a long shaft object provided with a hole through which the master rope is passed, and is a suspension provided in advance on the upper part of the concrete secondary product. A locking mechanism for hooking the metal fitting, a support mechanism for supporting the long-axis object, and a fastening member for fixing the long-axis object to the support mechanism are provided.
The inventor of the present application has come up with the present invention by paying attention to the fact that a suspension fitting is provided in advance on the upper part of the concrete secondary product for lifting the crane. That is, in the present invention, when the long-axis object is in an upright posture, the locking mechanism is caught by the hanging metal fitting so that the long-axis object cannot be separated from the hanging metal fitting. As a result, the posture of the long axis object is fixed and stabilized by the support mechanism and the fastening member, while the movement of the support mechanism is restricted by the long axis object. As described above, in the present invention, the functions of the long shaft object and the support mechanism complement each other. Thereby, it becomes possible to stably fix the long shaft object provided with the hole through which the master rope is passed to the upper part of the concrete secondary product in an upright posture. As a result, by setting up two long shaft objects on the upper part of the concrete secondary product, the parent rope can be easily stretched on the upper part of the concrete secondary product.
Moreover, since the master rope tensioning jig for a concrete secondary product is a simple mechanism consisting of a long shaft object, a locking mechanism, a support mechanism and a fastening member, it can be carried manually, and installation work related to the master rope tension, Removal work is extremely easy. As a result, work efficiency related to the master rope is improved and work cost is reduced.

In the master rope tensioning jig for a concrete secondary product according to claim 2, a metal fitting through-hole through which a head of the hanging metal fitting can pass is provided on a side surface portion of the long shaft object or the locking mechanism, and A notch through which the lower neck portion of the hanging fitting can pass from the fitting through hole to the bottom of the locking mechanism is provided.
In the master rope tensioning jig for a secondary concrete product described above, the locking mechanism is suitable for a hanging metal fitting when the long-axis object is in an upright posture by arranging the metal fitting through hole and the notch in the locking mechanism in the above manner. The long shaft object cannot be separated from the hanging bracket.

In the master rope tensioning jig for a secondary concrete product according to claim 3, a plurality of through holes through which the fastening member is passed are provided in the side surface portion of the long shaft object along the axial direction.
In the master rope tensioning jig for the secondary concrete product, the through hole is provided in the side surface portion of the long shaft object in the above manner so that the locking mechanism is suitably hooked to the hanging metal fitting, and the position of the long shaft object is supported by the support mechanism. And it becomes possible to fix with a fastening member.

According to the master rope tensioning jig for a secondary concrete product of the present invention, the long shaft object can be stably fixed to the upper part of the concrete secondary product in a standing posture. As a result, by setting up two long shaft objects on the upper part of the concrete secondary product, the parent rope can be easily stretched on the upper part of the concrete secondary product. As a result, the worker can work safely on the upper part of the concrete secondary product having a height of 2 m or more.
Furthermore, since the master rope tensioning jig for secondary concrete products of the present invention has a simple configuration, in addition to being able to be easily carried by hand, the work of providing a hole for installing a pipe in the upper part of the concrete secondary product, and The work of closing the hole with mortar, or the work of installing the ton block on the top of the concrete secondary product and the work of removing the ton block are unnecessary, and as a result, the work efficiency of the work related to the concrete secondary product is favorable. While improving, work cost comes to fall suitably.

  Hereinafter, the present invention will be described in more detail with reference to embodiments shown in the drawings. Note that the present invention is not limited thereby.

FIG. 1 is a main part explanatory view showing a master rope tensioning jig 100 for a concrete secondary product of the present invention. FIG. 1A is a front view, and FIG. 1B is a bottom view.
This master rope tensioning jig 100 for a secondary concrete product is used for lifting a pipe 10 (long shaft object) provided with a master rope passage hole 11 through which the master rope is passed, and for lifting a crane provided in advance above the concrete secondary product. Anchor bolt hooking portion 20 (locking mechanism) that hooks on an anchor bolt (hanging bracket), a stand 30 that supports the pipe 10 from four directions and stabilizes the posture, and a pipe fixing bolt that fixes the pipe 10 to the stand 30 A nut 40 (fastening member) is provided. Here, the hanging metal fitting provided on the upper part of the concrete secondary product is an anchor bolt having a dish-shaped head. In addition, the anchor bolt is provided in a recess on the surface of the concrete secondary product, and does not protrude from the surface of the concrete secondary product.

  The pipe 10 is a hollow cylindrical tube, for example. A master rope passage hole 11 through which the master rope is passed is provided at the upper part, and the master rope is stretched between the master rope passage hole 11 of the other pipe 10. In addition, a plurality of through holes 12 for penetrating the pipe fixing bolts 40 are provided in the side surface portion along the axial direction.

  The anchor bolt hooking portion 20 is provided with a bolt through hole 21 on its side surface that is larger than the head diameter of the anchor bolt, and a notch 22 having a length that reaches the other side surface across the bottom surface from the bolt through hole 21. It has been. In addition, the dimension of the clearance gap of the notch 22 is larger than the neck lower part diameter of an anchor bolt, and smaller than the head diameter. Accordingly, although details will be described later with reference to FIG. 2-3, the anchor bolt head is introduced into the anchor bolt hooking portion 20 through the bolt through hole 21 and the anchor bolt neck lower portion is cut along the notch 22. By passing, the notch 22 is suitably hooked to the anchor bolt head with the pipe 10 standing upright, and the pipe 10 cannot be separated from the anchor bolt.

  The width of the anchor bolt hooking portion 20 is larger than the width (outer diameter) of the pipe 10. This is because the anchor bolt is provided in the recess of the concrete secondary product surface. If the width is the same as the outer diameter of the pipe 10, it may happen that the anchor bolt head cannot be passed through the bolt through hole 21. That is, the anchor bolt hooking portion 20 may not be hooked on the anchor bolt. How much the anchor bolt hooking portion 20 is wider than the outer diameter of the pipe 10 depends on the size of the recess and the amount of protrusion from the inner surface of the anchor bolt.

  The bottom of the anchor bolt hooking portion 20 forms an R surface along the direction of the notch 22 so that the lower portion of the anchor bolt neck can pass through the notch 22 smoothly (see FIG. 3). .

  The stand 30 includes four legs and supports the pipe 10 from four directions to stabilize the posture of the pipe 10. Further, the stand 30 positions the pipe 10 at a position where the anchor bolt hooking portion 20 is suitably hooked on the anchor bolt with the pipe 10 standing upright. Therefore, in combination with the action of the anchor bolt hooking portion 20, the pipe 10 can be stably fixed to the upper portion of the concrete secondary product in a standing posture. As a result, it is possible to stably stretch the master rope between the two pipes 10 and 10 by raising the two pipes 10 and 10 on the concrete secondary product.

FIG. 2 is an explanatory diagram showing the hooking between the anchor bolt hooking portion 20 and the anchor bolt according to the present invention.
The pipe 10 is supported by a stand 30 and a pipe fixing bolt / nut 40 at a position where the bottom of the anchor bolt hooking portion 20 is suitably hooked on the anchor bolt head in a posture in which the pipe 10 stands upright. That is, the pipe 10 is supported at a position where the bottom of the anchor bolt hooking portion 20 is away from the recess of the concrete secondary product. In this state, even if the pipe 10 is pulled from the master rope, the anchor bolt head is located in the narrow portion of the bolt through hole 21, so that the anchor bolt head is caught in the through hole 21 or cut into the notch 22. As a result, the pipe 10 cannot be separated from the anchor bottle. As a result, the stand 30 prevents the pipe 10 from falling, while the pipe 10 restrains the movement of the stand 30. As described above, in the configuration of the underlined portion, the functions of the pipe 10 and the stand 30 complement each other, and the pipe 10 can be stably fixed to the upper portion of the concrete secondary product in an upright posture. It becomes like this. As a result, the master rope can be stably stretched over the concrete secondary product.

FIG. 3 is an explanatory diagram showing a procedure for introducing the anchor bolt into the anchor bolt hooking portion 20 according to the present invention.
First, as shown in FIG. 3A, the anchor bolt head is passed through the bolt through hole 21 of the anchor bolt hooking portion 20 in a state where the pipe 10 is tilted sideways.
Next, as shown in (b), the lower part of the anchor bolt is passed through the notch 22 while raising the pipe 10.
Next, as shown in (c), the anchor bolt head is housed in the anchor bolt hooking portion 20, and the pipe 10 is brought into an upright posture.
Next, as shown in (d), the pipe 10 is fixed by the stand 30 and the pipe fixing bolt / nut 40 at the position where the anchor bolt hooking portion 20 is most caught on the anchor bolt head with the pipe 10 standing upright. To do. In this embodiment, the pipe 10 is fixed at a position where the anchor bolt head contacts the notch 22.

As described above, according to the master rope tensioning jig 100 for a concrete secondary product, the pipe 10 can be stably fixed in an upright posture on the upper portion of the concrete secondary product. As a result, by setting up two pipes 10 on the upper part of the concrete secondary product, the parent rope can be easily stretched on the upper part of the concrete secondary product. As a result, the worker can work safely on the upper part of the concrete secondary product having a height of 2 m or more.
Furthermore, since the master rope tensioning jig 100 for a concrete secondary product has a simple structure, in addition to being easily carried by a hand, an operation for providing a hole for installing a pipe in the upper part of a concrete secondary product and its Work to close the hole with mortar, or to install the ton block on the upper part of the concrete secondary product and to remove the ton block become unnecessary, and the work efficiency of the work related to the concrete secondary product is preferably improved, The operating cost is suitably reduced.

  In the master rope tensioning jig 100 for a secondary concrete product described above, the hanging metal fitting is an anchor bolt having a dish-shaped head. However, the present invention is not limited to this. For example, for the anchor bolt (eye bolt) having a ring-shaped head. The parent rope tensioning jig 100 can also be applied. In this case, as shown in FIG. 4, the bolt through hole has, for example, a horizontally long rectangle, a horizontally long ellipse, or a combination thereof.

  In the master rope tensioning jig 100 for a concrete secondary product, the pipe 10 is supported by the stand 30 and the pipe fixing bolt / nut 40 at a position where the bottom of the anchor bolt hooking portion 20 is suitably hooked to the anchor bolt head. However, the present invention is not limited to this. For example, as shown in FIG. 5, even if a load is applied to the master rope between the bottom of the anchor bolt hook 20 and the anchor bolt head, the anchor bolt hook 20 There may be some play as long as the anchor bolt does not separate.

  The master rope tensioning jig 100 for a concrete secondary product of the present invention can be applied to a fall prevention jig for an operator who works on the upper part of a concrete secondary product.

It is principal part explanatory drawing which shows the master rope tension jig for concrete secondary products of this invention. It is explanatory drawing which shows the catch of the anchor bolt hook part and anchor bolt which concern on this invention. It is explanatory drawing which shows the procedure which introduce | transduces an anchor bolt into the anchor bolt hook part 20 which concerns on this invention. It is explanatory drawing which shows a bolt through hole in case the head of a hanging metal fitting is a ring-shaped anchor bolt. It is explanatory drawing which shows the play with respect to an anchor bolt head. It is explanatory drawing which shows the parent master tension installation jig | tool for conventional concrete secondary products. It is explanatory drawing which shows the parent master tension installation jig | tool for conventional concrete secondary products.

DESCRIPTION OF SYMBOLS 10 Pipe 11 Parent rope through-hole 20 Anchor bolt hook part 21 Bolt through hole 22 Notch 30 Stand 40 Pipe fixing bolt and nut 100 Parent rope tension jig for secondary concrete products

Claims (3)

  A long shaft object provided with a hole through which the master rope is passed, a locking mechanism for hooking on a hanging metal fitting provided in advance on a concrete secondary product, a support mechanism for supporting the long shaft object, and the long shaft object A master rope tensioning jig for secondary concrete products, comprising: a fastening member fixed to the support mechanism.   A side wall of the long shaft or the locking mechanism is provided with a metal through hole through which the head of the hanging metal can pass, and the neck of the hanging metal fitting extends from the metal through hole to the bottom of the locking mechanism. The master rope tensioning jig for secondary concrete products according to claim 1, wherein a notch through which the lower part can pass is provided.   The master rope tensioning jig for secondary concrete products according to claim 1 or 2, wherein a plurality of through-holes through which the fastening member is passed are provided in the side surface portion of the long shaft object along the axial direction.

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