JP2584020B2 - How to set long span steel beams with slope - Google Patents

Description

The present invention relates to a method for setting a long span steel beam having a slope.

"Conventional technology" In the case of long-span steel beams with a slope, install them between the lower pillars and then construct the floor, roof, etc.
Since a large horizontal force acts on the receiving portion due to the application of the load, there is a problem in how to attach the beam end to the lower frame.
In other words, if the lower pillars are to be able to handle the later horizontal force that occurs later on the steel beam, the burden capacity must be given to the lower pillars in advance, and the cost for the lower pillars will increase. Invite.

Therefore, a connecting means that does not transmit the horizontal force to the lower pillar is conventionally employed. That is, as shown in FIGS. 7a to 7c, the long span steel beam 1 with a slope is previously buried in the lower pillars 2, 2 in the loose fitting holes of the base plates 3, 3 attached to the beam ends 1a, 1a. The anchor bolts 4,... Are inserted between the lower pillars 2, 2 (see FIG. 3A), but at the time when only the own weight of the beam 1 acts, one of the two fulcrums A, B described above. A is the fixed side, and the anchor bolt 4 is fully tightened, while B is the movable side, and the final tightening is not performed (temporary tightening) (FIG. B).

 Thus, the side B has the ability to move horizontally.

The floor or roof 5 is constructed on the beam 1 and the finishing load P
Is added, a horizontal movement δ occurs at the unconstrained beam end 1a on the B side.

When the horizontal movement δ is completed, the anchor bolts 4 on the B side are fully tightened (FIG. 10C).

By the means for delaying the final tightening of the anchor bolt 4 at one of the fulcrums, the horizontal force generated in the steel beam 1 with a finish load is processed without being transmitted to the lower columns 2, 2.

The above-mentioned steel beam 1 does not fall off from the lower pillars 2, 2 due to the pressing action and the locking action of the anchor bolt 4.

"Problems to be solved by the invention" However, the above means have the following disadvantages. That is, once the steel beam 1 is set, after the construction of the floor, roof, etc. is completed, the anchor bolts are fully tightened again. (1) The steel frame work is performed twice, increasing the cost and extending the construction period.

(2) Since the skeletal construction is completed and the finishing work is being completed, the work is required for final fastening in a narrow space, so temporary construction is expensive and there is a problem in safety.

In the present invention, the steel frame work is completed at once, cost reduction,
An object of the present invention is to obtain a means that can shorten the construction period and has excellent safety without working in a narrow space.

[Means for Solving the Problems] In order to achieve the above object, in the setting method of the present invention, an anchor is welded in advance to a lower surface, and a latch groove is engraved on an upper surface, and a dam is provided. At least one of the shaped base plates is buried at the top of the lower column, and the other end of the long-span steel beam with a slope is engraved with a latch groove that engages with the latch groove on the lower surface of the beam end plate. After mounting and arranging, finishing is performed, and the generated horizontal movement is absorbed by sliding between the joint latch grooves and is locked by the dam.

An anchor is welded in advance to the lower surface, and a base plate with a hole drilled in the upper surface is buried in at least one of the top ends of the lower columns. A short leg that fits loosely into the hole protrudes, a capsule filled with thermite powder is placed in the concave hole, the steel beam is mounted and mounted between the lower columns, and the finishing is performed, and the horizontal movement that occurs is performed. The sliding between the base plate and the beam end plate is absorbed and the capsule is crushed by the short leg to fill the recess with the thermite powder, and the thermite powder is burned through the ignition hole formed in the beam end plate. Then, the beam ends are fixed and locked in the concave holes.

[Operation] According to the setting method of the present invention configured as described above, horizontal movement in a long-span steel beam with a gradient is simply mounted on and mounted between the lower columns, and is automatically performed on the lower columns. And is fixed without fear of falling off, completing the construction work.

Example An example will be described with reference to the drawings.

1 to 3 show the first invention, FIG. 1 is a longitudinal sectional view of a beam end formed on a moving side, FIGS. 2a and 2b are views showing a state before and after movement of a beam end, FIG. 3 is an explanatory plan view of a moving beam end.

In the figure, at the top of at least one lower pillar 2,
A base plate 9 having an anchor 6 welded to the lower surface in advance and a latch groove 7 formed in the upper surface and a dam 8 formed therein.
Is buried to form a receiving portion on the moving side.

The above-mentioned receiving portion does not necessarily have to be formed on the lower pillars on both sides. Normally, similarly to the conventional means of FIG. 6 described above, a base plate is attached to the beam end with one of the fixed sides, An anchor bolt buried in the lower pillar is inserted and fastened to this.

On the lower surface of the plate 10 at the beam end 1a of the long-span steel beam 1 having a slope mounted on the receiving portion side, a latch groove 11 that is engaged with the latch groove 7 is formed.

The steel beam 1 constructed as described above is suspended and mounted between the lower pillars 2 and 2 and, if necessary, is fixed on the fixed side. The movement δ is
This occurs between the joining surfaces of the latch grooves 7,11.

Since the above joining surface is configured with latch groove engagement,
Reverse movement is prevented.

Since the bank 8 is provided on the base plate 9 earlier in the moving direction, the beam end 1a does not fall off. The embankment 8 may calculate the horizontal movement δ in advance and abut the plate 10.

Thus, in the steel beam 1 having a large weight and a large pressing force, a sufficient fixing effect can be obtained as long as the horizontal restraint is ensured.

FIG. 3 shows a mode in which the beam end 1a has moved to the position indicated by oblique lines. In other words, if the steel beam 1 is finished, it is only necessary to leave it as it is, and no process is required.

4 to 6 show the second invention, FIG. 4 is a longitudinal sectional view of a beam end formed on the moving side, FIG. 5 is a longitudinal sectional view of the beam end before moving, FIG. b is a longitudinal and plan view after the beam end has moved. In the figure, an anchor 6 is welded to the top end of at least one of the lower pillars 2 on the lower surface in advance and a concave hole is formed on the upper surface.
12,... The perforated base plate 9 'is buried to form a moving-side receiving portion.

It is the same as the above-mentioned invention that the above-mentioned receiving part must always be constituted by the lower pillars on both sides. Plate of beam end 1a of long-span steel beam 1 with a gradient mounted on the receiving part side
On the lower surface of 10 ', short legs 13,. Capsules 14,... Filled with thermite powder are arranged in the concave holes 12.

When the steel beam 1 constructed as described above is separately mounted and mounted between the lower columns 2 and 2, and fixed on the fixed side if necessary, and the finishing work of the floor or roof 5 is performed. Horizontal movement δ
Occurs between the joining surfaces of the plates 9 'and 10'. At this time, the short leg 13 crushes the capsule 14, and thermit powder 14 '
Is filled in the recess 12.

The thermite powder 14 'is burned and melted in the plate 10' through the perforated ignition holes 15, so that the gap is filled.

Thus, the beam end 1a is fixed on the base plate 9 'in the horizontal direction. In other words, after finishing the steel beam 1 and dispersing the horizontal movement, the erection is completed only by igniting thermite from above the plate 10 '.

[Effect of the Invention] Since the present invention is configured as described above,
The effects are obtained as described below.

(1) Only one steel frame work is required, which leads to cost reduction and shortened construction period.

(2) Temporary installation (for full fastening of anchor bolts) is eliminated, and costs can be reduced.

(3) Work in a narrow space is eliminated, and safety can be ensured.

[Brief description of the drawings]

1 to 3 show the first invention, FIG. 1 is a longitudinal sectional view of a beam end formed on a moving side, FIGS. 2a and 2b are views showing a state before and after movement of a beam end, FIG. 3 is an explanatory plan view of a moving beam end. 4 to 6 show the second invention, FIG. 4 is a longitudinal sectional view of a beam end formed on the moving side, FIG. 5 is a longitudinal sectional view of the beam end before moving, and FIGS. Is a longitudinal and plan view after the beam end is moved. FIGS. 7a to 7c are explanatory diagrams with time of the conventional means. 1 ... long span steel beam with slope, 1a ... beam end, 2 ... lower pillar, 3 ... base plate, 4 ... anchor bolt,
5 ... Roof, 6 ... Anchor, 7 ... Latch groove, 8 ...
Weir, 9 ... Base plate, 10 ... Plate, 9 ', 1
0 ': Plate, 11: Latch groove, 12: Concave hole, 13:
… Short legs, 14 …… Capsules, 14 ′ …… Thermite powder, 15
…… Ignition hole.

Claims (4)

(57) [Claims] An anchor is welded to a lower surface in advance, a latch groove is formed in an upper surface, and at least one base plate having a dam is buried at a top end of a lower pillar, and the other has a slope. A latch that engages with the latch groove is engraved on the lower surface of the beam end plate of the long span steel beam, and the steel beam is mounted between the lower pillars and finished, and the generated horizontal movement is performed between the joining latch groove. A method for setting a long span steel beam having a gradient, characterized in that the beam is absorbed by the sliding motion and locked by the dam. 2. A long-span steel beam set having a slope according to claim 1, wherein one of the beam ends is fixed, a base plate is attached to the beam end, and an embedded anchor bolt is inserted into and fastened to the lower column. Method. 3. A base plate in which an anchor is welded to a lower surface in advance and a concave hole is formed in an upper surface is buried in at least one of the top ends of a lower column, and the other end of a long span steel beam having a slope. On the lower surface of the plate, a short leg which is loosely fitted in the concave hole is projected, a capsule filled with thermite powder is placed in the concave hole, and the steel beam is mounted on the lower column between the lower pillars, and the finishing is performed. The horizontal movement occurring is absorbed by the sliding between the base plate and the beam end plate, and the capsule is crushed by the short leg to fill the recess with the thermite powder. A method for setting a long-span steel beam having a gradient, characterized in that the beam is burned through a hole, and the beam end is fixed and locked in the concave hole. 4. A set of a long span steel beam having a slope according to claim 3, wherein one of the beam ends is fixed, a base plate is attached to the beam end, and an embedded anchor bolt is inserted and fastened to the lower column. Method.