JPS6123087Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention is designed to fix each bolt hole on the base frame of a crane fixing platform etc. on the foundation when installing multiple foundation bolts on the foundation constructed in the ground. This invention relates to a jig for centering each foundation bolt.

For example, the jib crane provided by the present applicant in Japanese Patent Application No. 56-136097 has a foundation 1 built in the ground as shown in FIG. 1, a crane fixing base 2 fixed on the foundation 1, and A post 3, a revolving body 4, a jib 5, etc. are assembled on the crane fixing base 2. The crane fixing base 2 is fixed to the foundation 1 by inserting a plurality of foundation bolts 6 into the foundation 1 into bolt holes 7 drilled in the flange 2a at the lower end of the crane fixing base 2, as shown in FIG. This is done by tightening a double nut 8 which is inserted into each of the base bolts 6 and screwed onto the head of the foundation bolt 6. Therefore,
Each of the foundation bolts 6 described above must be planted on the foundation 1 in alignment with each bolt hole 7 of the flange 2a of the crane fixing base 2.

However, in the jib crane shown in FIG. 1, in order to install each foundation bolt 6 in a position that matches the bolt hole 7 of the crane fixing base 2, the lower end of each foundation bolt 6 is installed as shown in FIG. In addition to installing the guide rod 9, these were attached to the outer periphery of the two upper and lower rings 10A and 10B to form a cage, and the cage was placed in the foundation construction hole, and then ready-mixed concrete was poured into the foundation construction hole to construct the foundation. At this time, each foundation bolt 6 is installed at a position that matches the bolt hole 7 of the crane fixing base 2.

However, in the above-mentioned method, when fresh concrete is poured into the foundation construction hole, misalignment may occur in the entire cage or in the foundation bolts 6. Modify or bolt hole 7 of crane fixing base 2
We had no choice but to make corrections (enlarging the bolt holes). There was also the problem that as the diameter and depth of the foundation construction hole increased, it became difficult to manufacture the cage shown in FIG.

The present invention was developed in view of the above-mentioned points, and it is possible to hold the foundation bolts without misalignment when fresh concrete is poured into the foundation construction holes, and to ensure that the foundation bolts are aligned with the bolt holes of the base frame after foundation construction. To provide a jig for centering foundation bolts that can obtain foundation bolts that have been taken out and planted, and can be used regardless of the diameter and depth of foundation construction holes.

In order to achieve this purpose, the foundation bolt centering jig of the present invention includes a plate that has an inlet for foundation construction agent and can be fitted into a foundation construction hole, and a tool that projects perpendicularly to the plate. , and a hollow shaft through which each foundation bolt can be inserted, and a nut that is threaded onto the head of the foundation bolt that is inserted through each hollow shaft and holds the foundation bolt in a hanging state by engaging with the upper end of the hollow shaft. and a support rod that is fixed to the upper surface of the plate and protrudes radially to the outside of the plate, and is capable of holding the plate in a fitted state in the foundation construction hole by passing the protrusion over the ground around the foundation construction hole. and each hollow shaft is arranged at a position that matches each bolt hole of the base frame with the center of the plate and the center of the foundation construction hole matching, and is capable of preventing misalignment of the foundation bolt. It is characterized by having an axial length.

An embodiment of the present invention will be described below with reference to FIGS. 4 to 6. In the figure, the jig for centering foundation bolts according to the present invention includes a disc-shaped plate 11 which has an injection port 12 for foundation construction agent in the center and can be fitted into a foundation construction hole H, and the plate. 1
a hollow shaft 13 that protrudes perpendicularly to the plate 1 and into which a plurality of foundation bolts (for example, threaded bolts) 6 to be installed in the foundation can be inserted; 1
1, and a claw 15 provided at the tip of the protruding portion of the support rod 14. The plate 11 has a foundation construction hole H
It has an outer diameter that is approximately the same as the hole diameter of the hole H, so that when it is fitted into the foundation construction hole H, it is easy to align the centers of the two. Each of the hollow shafts 13 is arranged at a position that matches each bolt hole 7 of the crane fixing base 2 shown in FIG. 2, for example, with the center of the plate 11 and the center of the foundation construction hole H matching, and It has an axial length that can prevent the foundation bolt 6 from misaligning. and each hollow shaft 1
A washer 16 is attached to the head of the foundation bolt 6 that is inserted into the
The base bolt 6 can be held in a hanging state by fitting the nut 17 and engaging the washer 16 with the upper end of the hollow shaft 13.

The support rods 14 are capable of holding the plate 11 in a fitted state in the foundation construction hole H by passing each tip end onto the ground around the foundation construction hole H. Further, the claws 15 are designed to bite into the ground and prevent the plate 11 from shifting when the plate 11 is held by the support rod 14.

Next, the process of centering and planting foundation bolts on a foundation constructed by using the centering jig according to the present invention will be explained. First, plate 1
1 is fitted into the foundation construction hole H as shown in FIG. 6, and the support rod 14 is passed over the ground around the foundation construction hole H to hold the plate 11. This plate 1
1 into the foundation construction hole H is performed so that the center of the plate 11 and the center of the foundation construction hole H coincide, and once the position of the plate 11 is determined, the support rod 14
the plate 1 by digging each claw 15 into the ground.
Prevent positional deviation from occurring in 1. Next, each foundation bolt 6 with a nut 16 screwed into its head is inserted into each hollow shaft 13 of the plate 11, and
The nut 16 is engaged with the upper end of the hollow shaft 13 to hold each foundation bolt 6 in a hanging state, and then fresh concrete is poured into the foundation construction hole H from the injection port 12 of the plate 11. When fresh concrete is poured, each foundation bolt 6 is guided by the hollow shaft 13, and
Since the plate 11 is held by the claws 15 of the support rods 14 biting into the ground, the foundation bolts 6
There will be no misalignment. Once the concrete poured into the foundation construction holes H has solidified, nuts 17 and washers 16 are removed from each foundation bolt 6, and plates 11 and support rods 14 are removed. As a result, the foundation 1 is constructed in the foundation construction hole H with the foundation bolts 6 centered with respect to each bolt hole 7 of the crane fixing base 2 shown in FIG. 2.

In the above embodiment, an example was shown in which fresh concrete is poured after the jig is set in the foundation construction hole H, but the jig may be set after pouring the ready-mixed concrete.

As explained above, the foundation bolt centering jig according to the present invention can hold each foundation bolt without causing misalignment when ready-mixed concrete is poured into the foundation construction hole. It is possible to obtain foundation bolts that are centered and planted with respect to each bolt hole of the base frame fixed above. Therefore, it is possible to eliminate the need to correct the foundation bolts or correct the bolt holes in the base frame due to misalignment. Further, since the plate for holding the foundation bolts in the present invention can be made according to the diameter of the foundation construction hole, it can be implemented regardless of the diameter and depth of the foundation construction hole.

[Brief explanation of the drawing]

Figure 1 is a side view of the jib crane shown in Japanese Patent Application No. 56-136097, Figure 2 is a sectional view showing the fixed part between the foundation and crane fixing base in Figure 1, and Figure 3 is the core of the foundation bolt. 4 to 6 show an embodiment of the present invention, FIG. 4 is a plan view of a jig for centering foundation bolts according to the present invention, and FIG. 5 is a perspective view of a cage formed for centering. FIG. 4 is a sectional view, and FIG. 6 is a sectional view illustrating a state in which a foundation bolt is centered using the centering jig according to the present invention. 1... Foundation, 2... Crane fixing base, 6... Foundation bolt, 7... Crane fixing base bolt hole, 1
DESCRIPTION OF SYMBOLS 1... Disc-shaped plate, 12... Inlet for foundation construction agent, 13... Hollow shaft, 14... Support rod, 15
...Nail, 16...Watushiya, 17...Natsuto, H
...Foundation construction hole.

Claims (1)

[Scope of utility model registration request] A jig for centering each of the foundation bolts with respect to each bolt hole of the base frame to be fixed on the foundation when installing multiple foundation bolts on the foundation constructed in the foundation. a plate having an inlet for a foundation construction agent and capable of fitting into a foundation construction hole; a hollow shaft that projects perpendicularly to the plate and into which each foundation bolt can be inserted;
A nut is screwed onto the head of the foundation bolt inserted into each hollow shaft and holds the foundation bolt in a hanging state by engaging with the upper end of the hollow shaft; a support rod that projects radially outward and that can hold the plate in a fitted state in the foundation construction hole by passing its protrusion over the ground around the foundation construction hole; The foundation is arranged at a position that coincides with each bolt hole of the base frame in a state where the center of the foundation construction hole coincides with the center of the foundation construction hole, and has an axial length that can prevent misalignment of the foundation bolt. jig for centering foundation bolts installed in