JP5414396B2 - Steel block raising jig - Google Patents

Description

  The present invention relates to a jig for raising a steel block.

  Conventionally, in field installation work such as harbor structures and bridges, each block, which is a steel structure, is carried to the construction site and stored in a stable posture until it is used for installation work. And about the block from which the attitude | position of storage differs from the attitude | position of installation, it is necessary to raise by a crane etc. in the case of installation operation | work.

  As a specific example, in a steel cell (for example, Patent Document 1) used for construction of a revetment, a work for raising a block constituting the steel cell is performed by a crane. In this case, if the uplifting work is performed with only one crane, the lower end of the block becomes a fulcrum for the uplifting, and the load of the block may be received intensively, so there is a risk of breakage. The construction method is widely used.

JP 61-130512 A

  However, according to the above construction method, the blocks suspended by the crane are easily affected by wind and are unstable, and if strong winds are generated, the work must be interrupted. In addition, since two cranes are used, there is a problem that the construction cost is high.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a steel block jig that is less susceptible to wind during block raising work and can be raised with a single crane.

In order to solve the above problems, a steel block raising jig according to claim 1 of the present invention is a jig used for raising a steel block,
A jig body having a guide recess that is open at one side to guide the steel block, and a holder that holds the steel block guided by the guide recess of the jig body on the jig body side. As well as
The outer surface of the lower corner portion opposite to the opening side of the guide recess of the jig body is formed in an arc shape to facilitate the rolling of the jig body .

Moreover, the jig for raising the steel block according to claim 2 is a jig used for raising the steel block,
A jig body having a guide recess that is open at one side to guide the steel block, and a holder that holds the steel block guided by the guide recess of the jig body on the jig body side. As well as
The outer surface of the lower corner portion opposite to the opening side of the guide recess of the jig body is formed in an arc shape,
In which the pedestal for placing the steel block which is guided in the guide recess is provided in the jig body.

  Further, the steel block raising jig according to claim 3 is the steel block raising jig according to claim 2, wherein the steel block raising jig is between the steel block guided by the guide recess and the base part. A protective plate for protecting the steel block is provided.

  According to the steel block raising jig, the block is hardly affected by the wind during the block raising operation, and the block raising operation can be performed with one crane.

It is a side view of the jig for raising a steel block concerning Example 1 of the present invention. It is AA sectional drawing in FIG. 1 of the jig for raising upright. It is a top view of the jig for raising upright. It is operation | movement explanatory drawing which raises a block using the jig | tool for raising together.

  Below, the jig | tool for raising the steel block which concerns on Example 1 of this invention is demonstrated based on FIGS. 1-4. The jig for raising the steel block according to the present invention is attached to one end of the steel block that needs to be raised, and the other end is lifted by a crane or the like to raise the steel block. belongs to. A case where the steel block is a block of a steel cell will be described below as Example 1.

First, a steel cell will be briefly described.
The steel cell is a cylindrical steel structure and is used for the construction of a seawall. Specifically, a large number of steel cells are sequentially driven into the seabed ground at regular intervals, and revetments are constructed by filling each steel cell with earth and sand.

  In general, steel cells are about 20 to 25m in diameter and 20 to 30m in height, so blocks are divided into multiple pieces in the circumferential direction rather than as a single unit, and are manufactured in the work yard at the installation site. The steel cell is completed by assembling and welding each block. When assembling the block, the block needs to be raised from the prone position, which is the posture it was manufactured, to the raised state, which is the posture for assembling the steel cell. It becomes.

  As shown in FIGS. 1-3, each block 1 of the said steel cell divided | segmented the cylinder into multiple in the circumferential direction (In FIG. 3, it divided into 5 equally in the circumferential direction) The shape (shape which broke bamboo) The steel shell plate 2, the longitudinal reinforcing material 3 that is axially attached to the inner peripheral surface of the steel shell plate 2 at a predetermined interval and reinforces the steel shell plate 2, and is attached perpendicularly to the vertical reinforcing material 3. The vertical reinforcing member 3 is formed with a bolt hole 5 in the circumferential direction for joining the suspension tool.

  Next, the raising jig 11 which is the gist of the present invention will be described with reference to FIGS. In addition, in the state where the block 1 of the steel cell to be raised is turned down, the side on which the block 1 is lifted is the front direction, the side on which the jig is attached (grounding side) is the rear direction, and the front and rear direction is orthogonal to A direction on the horizontal plane will be described as the left-right direction.

  As shown in FIG. 1, the raising jig 11 includes a C-shaped jig main body 12 having a guide concave portion 14 that can guide the rear end of the block 1, and the guide of the jig main body 12. A holder 13 that holds the rear end of the block 1 guided by the recess 14 on the jig body 12 side, and a connection member 41 that connects the pair of jig bodies 12 arranged in the left-right direction; The front is open.

  The jig main body 12 is arranged in the front-rear direction on the ground to form the lower side of the C-shaped side view and a lower horizontal member 22 having a rectangular base 24 on which the block 1 is mounted is attached to the upper surface. An upper horizontal member 21 that is arranged substantially parallel above the lower horizontal member 22 and forms the upper side of the C-shape in side view, and a vertical member 23 that connects the upper horizontal member 21 and the lower horizontal member 22 The surface (outer surface of the lower corner portion of the jig body 12) from the rear side surface of the vertical material 23 to the lower surface (grounding surface) of the lower horizontal material 22 is formed in an arc shape, and the jig body 12 is It is made into the shape which is easy to roll to the direction which 23 contacts. The lower horizontal member 22 and the upper horizontal member 21 and the vertical member 23 constituting the jig main body 12 are all detachable because they are joined by bolts, and the jig main body 12 has different sizes of components ( By combining the upper horizontal member 21, the lower horizontal member 22, and the vertical member 23), the size of the guide recess 14 and the constituent members can be freely changed according to the size and weight of the block 1 to be guided and held. Since the block 1 may be damaged by the contact with the pedestal portion 24, the block 1 is protected by inserting a wooden protective plate 25 between the pedestal portion 24 and the steel shell plate 2 of the block 1. And

  On the other hand, the holder 13 includes a joining plate 31 that is attached to the lower surface of the upper horizontal member 21 of the jig body 12 and protrudes into the guide recess 14. The joint plate 31 is guided by the guide recess 14 and is a pedestal. Bolt holes 32 are formed for connecting and holding the longitudinal reinforcement 3 of the block 1 placed on the portion 24.

  Then, the pair of jig bodies 12 arranged in the left-right direction are connected by the four connecting members 41 at the front part and the rear part of the upper horizontal member 21 and the front part and the rear part of the lower horizontal member 22 to be raised. A jig 11 is configured.

Hereinafter, the raising operation of the block 1 using the raising jig 11 will be described with reference to FIG.
A constituent material suitable for the size of the block 1 to be raised is selected in advance, and each constituent material is joined with a bolt to assemble the raising jig 11 suitable for the block 1.

  Next, the rear end portion of the block 1 placed in a state where it is lying down on the installation site is guided to the guide concave portion 14 of the raising jig 11 and placed on the pedestal portion 24. Specifically, the block 1 is placed on the temporary table with the outer peripheral surface of the steel shell plate 2 facing down, and the rear end portion of the steel shell plate 2 of the block 1 is guided to the guide recess 14. The raising jig 11 is moved forward. After the bolt hole 5 of the vertical reinforcing member 3 of the block 1 and the bolt hole 32 of the joining plate 31 are moved to the same position, the longitudinal reinforcing member 3 and the joining plate 31 are joined by the bolt nut 33 to block 1. Hold. Here, a wooden protective plate 25 is inserted into the gap formed between the steel shell plate 2 and the pedestal portion 24 to protect the steel shell plate 2. The bolt nut 33 constitutes the holder 13 together with the joining plate 31.

  As described above, after the block 1 is held by the raising jig 11, the lifting tool is joined by the bolt hole 5 formed in the front end portion of the vertical reinforcing member 3 of the block 1 and lifted by the crane. The said suspension tool is connected to a beam through a wire (refer Fig.4 (a)).

  Then, when the block 1 is lifted with a crane and the front end of the block 1 is lifted, the raising jig 11 on the rear end side serves as a fulcrum, and the block 1 is raised (see FIG. 4B). After the block 1 is vertically raised (see FIG. 4 (c)), the raising jig 11 is removed from the block 1 and the temporary table is removed, and the raised block 1 is lowered to the ground. The raising work is completed.

  In the above description, the two jig main bodies 12 are connected by the connecting member 41. However, in actual production, the pair of lower horizontal members 22 are connected by the two connecting members 41 in advance, The upper horizontal member 21 is connected by the other two connecting members 41, and these are joined by the vertical member 23.

  Depending on the weight and size of the block 1, two raising jigs 11 may be used. Since the block 1 is held by the two raising jigs 11 at the left and right positions of the rear end portion, when raised, it is grounded at two places via the raising jigs 11 and the block 1 The raising work is stabilized.

  Thus, since only one crane is sufficient for the work of raising the block 1, the construction cost can be reduced. Further, at the time of raising work, one end of the block 1 is grounded via the raising jig 11, so that it is not easily affected by wind and the process is not easily influenced by the weather. Furthermore, since the structure of the raising jig 11 is simple and the constituent materials can be freely combined, it can correspond to the blocks 1 of steel cells of various sizes.

  By the way, in the said Example, although the jig | tool 11 for raising was demonstrated as what connected a pair of jig | tool main bodies 12 with the connection member 41, you may consist of one jig | tool main body 12. FIG.

Moreover, in the said Example, although the base part 24 which mounts the block 1 demonstrated as what was attached to the lower horizontal member 22, the structure which does not have the base part 24 may be sufficient.
In the above embodiment, the protective plate 25 has been described as being made of wood, but is not limited to wood, and may be made of rubber or other materials. Further, the protective plate 25 may not be used.

DESCRIPTION OF SYMBOLS 1 Block 2 Steel shell board 3 Vertical reinforcement material 11 Standing jig | tool 12 Jig body 13 Holding tool 14 Guide recessed part 21 Upper horizontal material 22 Lower horizontal material 24 Base part 25 Protection board 31 Joining board 41 Connection member

Claims (3)

A jig used to raise a steel block,
A jig body having a guide recess that is open at one side to guide the steel block, and a holder that holds the steel block guided by the guide recess of the jig body on the jig body side. As well as
Raising the steel block, characterized in that the outer surface of the lower corner portion opposite to the opening side of the guide recess of the jig body is formed in an arc shape to facilitate the rolling of the jig body. Jig. A jig used to raise a steel block,
A jig body having a guide recess that is open at one side to guide the steel block, and a holder that holds the steel block guided by the guide recess of the jig body on the jig body side. As well as
The outer surface of the lower corner portion opposite to the opening side of the guide recess of the jig body is formed in an arc shape,
Jig-raised vertical steel block it, characterized in that the base portion for placing a steel block which is guided in the guide recess is provided in the jig body.   The jig for raising the steel block according to claim 2, wherein a protective plate for protecting the steel block is provided between the steel block guided by the guide recess and the pedestal portion.

Images