JPH0251003B2 - - Google Patents

Description

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

Shoring is used as a means of supporting forms for concrete pouring when constructing a concrete slab (floor slab) in construction work, or as a means of supporting structures such as bridge girders.

Shoring used as a support means for the former type of material has conventionally been configured to be expandable and retractable by screwing screw rods onto the pillars.

However, in such a structure, installation and removal of the shoring is time consuming and workability is poor.

In other words, when installing and removing the shoring,
It is necessary to extend and contract the shoring by lifting and lowering the screw rod by hand, and when using a large number of shorings, it is not possible to expand and contract each shoring at the same time. The work is troublesome.

On the other hand, the shoring used as a means of supporting the latter structure is composed of a large number of pipe materials and steel materials, but like the former, the shoring itself has the function of lifting and lowering the structure. I haven't. In other words, lifting the structure is carried out using a crane, and lowering the structure is carried out by supporting the structure on a large number of hydraulic jacks installed on the shoring via steel members, contracting the hydraulic jacks, and removing the steel members. However, the structure is gradually lowered by repeatedly attaching and detaching the hydraulic jacks, which results in poor work efficiency and needs to be improved.

The present invention was made with the aim of solving the above-mentioned technical problems, and provides a shoring system that can be installed and removed easily and quickly, and that also allows structures to be easily lifted up and lowered. This is what we provide.

The basic structure of the present invention to achieve the above object is that a screw rod is disposed inside a support member so as to be vertically slidable, one end of the screw rod is made to protrude from one end of the support member, and the screw rod is moved by hydraulic pressure. It is designed to be raised and lowered by a jack.

Embodiments of the present invention will be described below with reference to the drawings. Drawings 1 to 9 show the first embodiment, and the 10th embodiment
The figures to FIG. 18 show the second embodiment.

The shoring A of the first embodiment consists of a strut member 1, a screw rod 2, and a hydraulic jack 3, and is configured to be expandable and retractable. The strut member 1 has four struts 11c arranged in a planar rectangular shape between upper and lower flanges 11a and 11b, and is made by connecting a plurality of welded vertical frames 11, and a screw rod 2 can be slid up and down inside. It is placed by inserting it into the

The screw rod 2 is threaded along the entire length of the outer circumference of the pipe or shaft member, and is inserted through the upper and lower flanges 11a and 11b of the frame 11 at the upper end of the support member 1, and protrudes from the upper end of the support member 1. .

A receiving portion 2a is provided at the upper end of the screw rod 2 protruding from the support member 1 to receive and support a structure B such as a bridge girder or a form material for concrete pouring. A first stopper 4 is provided at an interval on the threaded portion of the screw rod 2 below the receiving portion 2a.
and the second stopper 5 are screwed together. 1st
The stopper 4 comes into contact with a ram 3a of a hydraulic jack 3, and supports the screw rod 2 on the support member 1 via the hydraulic jack 3. The second stopper 5 has approximately the same diameter as the first stopper 4 and is located above the first stopper 4, contacts the upper end of the column member 1, that is, the upper flange 11a of the frame 11, and supports the screw rod 2 on the column member 1. It is something to do.

The hydraulic jack 3 is for raising and lowering the screw rod 2, and is of a center hole type that loosely fits around the outer periphery of the screw rod 2. The hydraulic jack 3 is of a center hole type that fits loosely around the outer periphery of the screw rod 2. It is housed inside and fixed to the lower flange 11b of the frame 11.

A plurality of the supporting structures A of the first embodiment as described above are used individually, or a plurality of supporting structures A are connected together and used as a frame. In these usage modes, the shoring A can be used with the protruding side of the screw rod 2 facing either upward or downward. In this embodiment, there are a plurality of supports A with screw rods 2 protruding upward.
The case where the structure B is lifted up and lowered is shown in FIG. 2, but since the operation of each support A is the same, only one support A will be explained.

Each shoring A supports a structure B with a receiving part 2a at the upper end of its screw rod 2, and also has a hydraulic jack 3.
The structure B is lifted up and lowered by connecting each to one hydraulic pump (not shown) and operating them in synchronization. The lifting work of structure B is the first
This is done from the state where the shoring A is contracted as shown in the figure.

In this state, the first stopper 4 contacts the contracted ram 3a of the hydraulic jack 3, and the second stopper 5 contacts the upper flange 11a at the upper end of the column member 1, supporting the screw rod 2 and supporting the structure B. receiving weight. Then, by extending the hydraulic jack 3 from the above state, the screw rod 2 is raised as shown in FIG.
to lift up. The extension operation of the hydraulic jack 3 is stopped when the first stopper 4 comes into contact with the lower surface of the upper flange 11a. Further, as the screw rod 2 rises, the second stopper 5 moves away above the upper flange 11a. After the structure B is lifted up by the extension stroke of the hydraulic jack 3 in this way, the second stopper 5 is rotated to lower it to the upper surface of the upper flange 11a, as shown in FIG. Instead, the screw rod 2 is supported by the second stopper 5. Thereafter, as shown in FIG. 5, the hydraulic jack 3 is retracted, and the first
The stopper 4 is rotated and brought into contact with the ram 3a of the contracted hydraulic jack 3.

By repeating the above operations, the shoring A is expanded and the structure B is lifted up intermittently.

On the other hand, the lowering work of structure B is performed from the state where shoring A is extended as shown in FIG. In this state, the hydraulic jack 3 is contracted, and the second stopper 5 and the first stopper 4 abut the upper and lower surfaces of the upper flange 11a at the upper end of the column member 1, respectively, and the screw rod 2 is moved by the second stopper 5. It is supported and bears the weight of structure B. Then, by extending the hydraulic jack 3 from the above state as shown in FIG. 7, the ram 3a comes into contact with the first stopper 4 and supports the screw rod 2 instead of the second stopper 5. receives the weight of B.
Next, as shown in FIG. 8, the second stopper 5 is rotated to move it upward by the contraction stroke of the hydraulic jack 3. Thereafter, by retracting the hydraulic jack 3, the screw rod 2 is lowered until the second stopper 5 comes into contact with the upper flange 11a, as shown in FIG. 9, and the structure B is lowered.
After the structure B has descended by a predetermined amount, the first stopper 4
is rotated and moved upward to come into contact with the lower surface of the upper flange 11a.

By repeating the above operations, shoring A
is contracted and the structure B is lowered intermittently.

Although it is not shown in the drawings, when using shoring A as a means of supporting shapes for concrete pouring, a large number of shoring A can be extended simultaneously, and each shoring A can hold the mold. To support. and,
After the poured concrete has hardened, each shoring A
This is to shrink and remove them all at once.

Next, a second example will be described. Components that are the same as those in the embodiment described above are designated by the same reference numerals, and explanations thereof will be omitted.

The shoring A' of the second embodiment has a pair of hydraulic jacks 1 attached to the upper end of the support member 1 via a flange 6.
3, 23 are fixed, and these hydraulic jacks 13, 2 are fixed.
A relatively large-diameter first stopper 24 that contacts the rams 13a, 23a of No. 3 is screwed onto the screw rod 2, and a second stopper 25 that contacts the upper surface of the flange 6 is screwed at a position below the first stopper 24. It is screwed onto Eurotud 2. The hydraulic jacks 13 and 23 are connected to respective hydraulic systems so that they operate in synchronization.

The lifting operation of the structure B using the shoring A' of the second embodiment as described above is performed from the state shown in FIG. 10.

In this state, the first stopper 24 contacts the contracted rams 13a and 23a of the hydraulic jacks 13 and 23, and the second stopper 25 supports the screw rod 2 by contacting the flange 6, and receives the weight of the structure B. There is.

Then, from the above state, the hydraulic jacks 13, 2
By synchronously extending the 3rd part, the 12th
As shown in the figure, the screw rod 2 rises and lifts up the structure B. When the screw rod 2 is raised, the second stopper 25 is moved away above the flange 6. After the structure B is lifted up by the extension stroke of the hydraulic jacks 13 and 23 in this way, the first
As shown in FIG. 3, the second stopper 25 is rotated and lowered to the upper surface of the flange 6, and the hydraulic
The screw rod 2 is supported by the second stopper 25 instead of the screw rod 3. Thereafter, as shown in FIG. 14, the hydraulic jacks 13, 23 are retracted, and the first stopper 24 is rotated and lowered to come into contact with the rams 13a, 23a of the retracted hydraulic jacks 13, 23.

By repeating the above operations, shoring can be done.
A' extends and intermittently lifts up structure B.

On the other hand, the work of lowering the structure B is performed from the state where the shoring A' is extended as shown in FIG. In this state, the hydraulic jacks 13, 23 contract and their rams 13a, 23a are separated from the first stopper 24,
In addition, the second stopper 25 abuts against the flange 6 to support the screw rod 2 and receive the weight of the structure B. Then, by extending the hydraulic jacks 13, 23 from the above state as shown in FIG. and receives the weight of structure B. Next, as shown in FIG. 17, the second stopper 25 is rotated to move upward by the contraction stroke of the hydraulic jacks 13, 23. Thereafter, by retracting the hydraulic jacks 13 and 23, the second stopper 25 is moved to the flange 6 as shown in FIG.
The screw rod 2 descends until it comes into contact with the structure B, thereby lowering the structure B. After the structure B has descended, the first stopper 24 is rotated, and the hydraulic jacks 13,
Move upward by 23 extension strokes.

By repeating the above operations, the shoring A' contracts and the structure B is lowered intermittently.

Incidentally, when the above-mentioned shoring A' is used as a means for supporting a mold material for concrete pouring, it is the same as in the first embodiment.

As explained above, the present invention provides a structure in which a screw rod is slidable up and down inside a column member, one end of the screw rod projects from one end of the column member, and an end of the column member on the side from which the screw rod protrudes. A hydraulic jack is fixed along the axis on the inside or outside of the screw rod, and a first stopper that comes into contact with the ram of the hydraulic jack and a second stopper that comes into contact with the end of the column member are respectively placed on the protruding side of the screw rod. Since they are screwed together, they have the following effects.

The shoring can be extended and contracted by rotating the first stopper and the second stopper and moving them up and down, and by extending and contracting the hydraulic jack while alternately supporting the column member and the screw rod with both stoppers. When using a large number of shoring structures, it is possible to synchronize the operation of the hydraulic jacks by connecting the hydraulic systems of the hydraulic jacks of each shoring structure, and to extend and retract a large number of supports simultaneously. Installation and removal work can be performed easily and quickly.

By expanding and contracting the shoring itself while supporting the structure, the structure can be easily raised and lowered.

[Brief explanation of drawings]

Fig. 1 is a front view showing a shoring structure according to the first embodiment of the present invention, Fig. 2 is an enlarged sectional view taken along the line - - in Fig.
Figures 9 through 9 are explanatory diagrams of the expansion and contraction operations of the shoring, and Figure 10.
The figure is a front view showing the shoring of the second embodiment, FIG. 11 is an enlarged sectional view taken along the line XI-XI in FIG. 10, and FIGS. 12 to 18 are explanatory diagrams of the expansion and contraction operations of the shoring. In addition, in the figure, A, A'... Shoring, 1... Support member,
2... Screw rod, 3, 13, 23... Hydraulic jack, 3a, 13a, 23a... Ram,
4, 24...first stopper, 5,25...second stopper.

Claims (1)

[Claims] 1. A screw rod is made vertically slidable inside the support member, so that one end of the screw rod protrudes from one end of the support member, and a hydraulic jack is installed inside or outside the end of the support member on the side from which the screw rod protrudes. A shoring structure that is fixed along an axis and is formed by screwing together a first stopper that abuts the ram of the hydraulic jack and a second stopper that abuts the end of a support member, respectively, on the protruding side of a screw rod.