JPS59187907A - Support and holding construction - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to shoring.

Shoring supports structures such as bridge girders during construction work, and is made up of steel materials, pipes, etc. Construction of bridge girders using such supports has conventionally been carried out as follows.

That is, the bridge girder is hoisted up by a crane and placed on a support installed near the bridge pier, and after the bridge girder is positioned using the support, it is lowered and placed on the bridge pier for identification. The work of hoisting a bridge girder with the above-mentioned crane, that is, the lifting work, is more difficult as the bridge girder is larger and the height of the support is higher, and it is accompanied by great danger. Further, the work of lowering the bridge girder is carried out in the following manner by stacking a large number of steel members on the shoring, installing a number of hydraulic jacks on top of the steel members, and supporting the bridge girder with the hydraulic jacks.

First, remove the steel material from the location where the hydraulic jack was installed, install a new hydraulic jack in the lower part where the steel material has been removed, and let the jack support the bridge girder. By removing the hydraulic jacks that supported the bridge girders, scattering the striped material at the location where they were installed, and then reinstalling the hydraulic jacks at the locations where the m materials had been removed, the work was repeated. The bridge girder is gradually lowered.

However, in such a process, it takes time and effort to attach and detach the hydraulic jack and remove the steel material, resulting in extremely poor workability and safety issues.

On the other hand, the shoring must be removed after the bridge girder is erected, but since there is only a small gap between the shoring and the erected bridge girder, it is not possible to mechanically remove the shoring using a crane, etc. However, the shoring had to be manually disassembled and removed, resulting in poor workability.

The present invention was made with the aim of solving the above-mentioned technical problems, and provides a shoring system that enables quick and safe lifting and lowering of structures such as bridge girders and removal of the shoring itself. Hereinafter, embodiments of the present invention will be described with reference to the drawings.

The shoring (A) of this embodiment has four hollow supports (1) as shown in Figs. 1 to 3, an underframe (a), and each support ( Four screw rods (2) are slidably inserted into the support columns (1) and protrude from the support columns (1).
), and is configured to be expandable and contractible.

Underframe (a>h) Each support (1) is connected by side frames (6a) (6b) to form a frame with a planar rectangular shape.The support (1) is as shown in Figures 4 and 5. It is made of pipe material with a circular cross section, and the upper end is closed to prevent rainwater from entering the interior.In this support (1), a screw rod (the end on the side where the smell protrudes, that is, the outer periphery of the lower end is A pair of hydraulic jacks (8) d (mounted along the axis).

The hydraulic jack (8) is fixed with the ram (3a) facing downward between two upper and lower 7 langes (7) (8) welded to the column (1), and the ram (3a) is attached to the lower 7 lange (7). 8)
The hydraulic jacks (3) of each of these columns (1) protrude downward from the lower end of the column (3) which is slidably inserted through the column (1).
Each of them is connected to one hydraulic pump (not shown), and is expanded and contracted in synchronization with each other.

The screw rod 2) fitted into the support column (1) is a relatively thick pipe material with threads cut along the entire length of the outer periphery, and has a flange portion (2a) at the upper end and a flange portion (2a) at the lower end. It is grounded via the pedestal (9). The flange part (2a
) is used to hold the screw rod (2) as a support (to prevent it from being removed), and the screw rod (2) is attached to the support (1).
The lower end guide (1a
). A first stopper (4) and a second stopper (5) for locking the column and screw rod (2) are screwed into the protrusion of the column screw rod (2). 1 stoppa (4) i
i: A device that engages and disengages from the lower end of the column (1), with a rotating ring b around the outer circumference.
A handle (4a) for operation is provided. The second stopper (5) engages and disengages from the ram (3) of the hydraulic jack (3), and is located below the collar (4) and has a larger diameter than the stopper (4). A handle (5a) for rotational operation is provided on the outer periphery. A side frame 00uυ is attached to the lower part of the screw rod (2) with the rod (2) largely protruding from the column (1), and the side frame 0 (
Each screw quadruple (2) is connected at (b). side frame 0
As mentioned above, when the screw rod (2) protrudes and the shoring (A) is extended, the 1Hcii is to ensure the rigidity of the lower part of the shoring (A). It is removable.

The shoring (A) of this embodiment as described above supports structures such as bridge girders (B) and lifts and lowers them, and there are three usage modes as follows.

The first is when shoring (~ is used alone, in which case the shoring (A) directly supports the bridge girder (B) on the top surface of the underframe (a). The second is when one or more shoring is used. In this case, the shoring (A) is stacked together with the conventional shoring and connected to each other. In this case, the shoring (A) may be installed at the top, middle, or bottom of the bridge. ψ) directly or indirectly.

The eighth case is when a plurality of supports (4), for example, two supports (4), are stacked and connected to each other as in this embodiment. In this case, each support support (A) expands and contracts individually, so the bridge girder (B) It can be launched and descended significantly.

In addition, it goes without saying that in the above eight usage modes, the shoring (A) can be used upside down.

Therefore, when lifting and lowering the bridge girder (B), each support (G) is expanded and contracted at the same time or separately, but since the work is the same, only the expansion and contraction work of one support (N) will be explained. .

The work of expanding and contracting the shoring (N) is carried out as shown in FIGS. 4, 6, and 7 from the most contracted state of the shoring (N).

When the shoring (A) is in the most contracted state, the first stopper (4) and the second stopper (5) descend vertically as shown in Fig. 4, and the first stopper (4) The second stopper (5) is engaged with the ram (3a) of the hydraulic jack (8) in a state where it is in contact with the base (9).

From this state, the hydraulic jack (
3), it slides upward along the rod (2) by the length of the extension stroke, causing the underframe (a) to rise and lift the bridge girder (B). After the hydraulic jack (3) stops extending, the first stopper (4) is rotated and moved upward as shown in Fig. 7. is locked to prevent the lowering of the underframe (-). Then, after the hydraulic jack (3) is retracted, the second stopper (5) is rotated to move upward, and the retracted hydraulic jack ( 3) engage the second stopper (5) with the ram (3a).

By repeating the above operations, the 7 rungs (2a) at the upper end of the screw rod
), the underframe (a) intermittently rises, the shoring (A) extends, and the bridge girder (B) is raised to a predetermined height position.

On the other hand, the shrinking work of the shoring is performed from the most extended state of the shoring as shown in FIGS. 8 to 10. When the support (to the support) is fully extended, the first stopper (4) engages with the lower end of the support (1) as shown in Figure 8.
Moreover, the second stopper (5) is engaged with the ram (3a) of the hydraulic jack (8). From this state, as shown in Figure 9, the second stopper (5) is rotated to move downward by the extension stroke of the hydraulic jack (3), and then the hydraulic jack (3) is extended and the 2nd ram (3a)
The underframe (-) and the bridge girder (B) are supported by the hydraulic jack (3) by bringing it into contact with the stopper (5). Next, after rotating the first stopper (4) and moving it downward by the contraction stroke of the hydraulic jack (3), the hydraulic jack (3) is contracted as shown in Fig. 1θ. contraction)
The underframe (a) is lowered until the first stopper (4) slides downward and the bridge girder (B) is lowered.

By repeating the above various operations, the underframe 0 is intermittently lowered, the shoring (A) contracts, and the bridge girder (B) is lowered onto the pier (C). Bridge girder (B) is pier (0)
After the shoring ■ has been lowered, by removing the lower side frame Q01, the shoring ■ will contract until the second stopper (5) comes into contact with the pedestal (9) at the lower end of the screwdriver (2), and the bridge girder will be (
They are separated downward from B) and removed in order from the top by a crane or the like (not shown).

Further, the above-mentioned shoring (A) can also be used as a means for supporting the form material for pouring concrete when constructing a concrete slab (floor slab) between bridge spaces.

In this case, the shoring (A) should be shrunk in the same manner as described above after the concrete slab has hardened, and it can be left at a wide distance from the concrete slab and easily removed using a crane, etc. As explained above by the present inventor. , an underframe having a plurality of hollow pillars, and a screw rond slidably fitted into each of the pillars of the underframe and protruding from the pillars; A pair of hydraulic jacks are attached to the outer periphery of the end of the protruding side, respectively, along the axis, and the protruding portion of the scree rod from the column is provided with a first stopper that engages and disengages from the end of the column; Since the second stopper that engages and disengages from the ram of the hydraulic jack is sequentially screwed together from the column side, the following effects are achieved.

■ The first stopper and the second stopper are rotated to move up and down, and the hydraulic jack is extended and retracted while alternately locking the column and the scree rod with these two stoppers. By intermittently expanding and contracting, the work of raising and lowering the structure can be carried out quickly and safely, and workability can be improved.

■ After the structure is hoisted up and installed in a predetermined location, the shoring is shrunk and separated from the structure by a large distance downwards, allowing the shoring to be quickly removed using a crane or the like.

(2) Since both the first stopper and the second stopper are arranged adjacent to each other, the operator can operate both stoppers without making a large change in posture, resulting in excellent workability.

[Brief explanation of drawings]

Fig. 1 is a front view showing the shoring of the present invention in use, Fig. 2 is an enlarged front view of the shoring, Fig. 8 is a side view of the same, and Fig. 4 is a partially cutaway front view showing an enlarged view of the main parts. Figure 6 is the same as Figure 4 (
V) - (V) line enlarged sectional view and FIGS. 6 to 10 are explanatory views of the expansion and contraction operations of the shoring. In addition, in the figure (g)... Shoring (a) - One frame (1) - Support (2) - Screw rod (3) - Hydraulic jack (4)...
1st stopper (5) ... 2nd stopper (3a
)...Hydraulic jack gym patent applicant Meidai Lease Limited Partnership Company -'! ”, 3 18 pieces, figure 2, figure 7

Claims (1)

[Claims] an underframe having a plurality of hollow supports; and a scree rod that is slidably inserted into each support of the underframe and protrudes from the support; A pair of hydraulic jacks are attached to the outer periphery of the protruding end, respectively, along the axis line, and the screws from the column are fixed.
A shoring structure in which a first stopper that engages and disengages from the end of a support column and a second stopper that engages and disengages from a ram of a hydraulic jack are screwed into the protruding portion of the rond in sequence from the support side.