JPS6268950A - Block filled steel pipe structure - Google Patents

Abstract

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

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a block-filled steel pipe structure used for columns, piles, etc.

[Prior Art] A filled steel pipe concrete structure is known as this type of structure, but the conventional filled steel pipe concrete structure consists of vertically standing steel pipes that also serve as formwork, and filling the inside with liquid concrete. It was solidified.

[Problems to be solved by the invention] For this reason, most of the work is done on-site, which not only takes time, but also requires a certain amount of strength due to the fact that the concrete is first and poured on-site. I could only get so far.

The purpose of the present invention is to provide a steel pipe structure filled with tubes (7) and 7 that can reduce on-site work and improve the compressive strength, especially in the sleeve-U direction. [Means for Solving the Problems] The present invention solves the above-mentioned problems by forming blocks of structural material to be filled into the inside of the pipe and manufacturing the blocks in a factory by autoclaving or the like. Therefore, in detail, there is a cylindrical or multi-ft4 tube made with dimensions slightly smaller than the inner diameter of the steel pipe inside the A4 pipe.
Insert a large number of shaped blocks and fill the gaps between these blocks and between the blocks and steel pipes with +1M building filler 1
．． It is characterized by

[Embodiments] Hereinafter, embodiments of the present invention in the case of unpond-type filled steel pipe groove construction will be described with reference to the drawings.

FIG. 1 shows an embodiment in which the present invention is applied to a pipe. In the figure, 1 is a steel pipe with a circular cross section.

Inside the steel pipe 1, a large number of concrete blocks 2 are stacked and inserted in order from the top, and filler material 3 is inserted between these blocks 2 and the steel pipe 1 and in the gaps between the blocks 2.
Further, an unbonding treatment layer 4 is provided at the interface between the steel pipe I and the filler 3 to prevent adhesion between the steel pipe 1 and the filler 3. In this case, the unbonded layer 4 is formed by applying paraffin, asphalt, oil, grease, vaseline, etc. to the inner surface of the steel pipe 1.

In addition, block 2 is manufactured by autoclave curing in a factory, and has a much higher compressive strength than ordinary concrete, and its outer diameter is 2 to 3 cm larger than that of steel pipe I.
It is formed small and can be easily inserted into the steel pipe I. In addition, a hole 5 is drilled in the center of the block 2 for filling with concrete and the like, and a plurality of small holes 6 are formed at appropriate locations on the second side, as shown in Figure 2. A protrusion 7 is provided on the lower surface of the block 2, and the protrusion 7 fits snugly into the small hole 0 of the lower block 2. The height of the protrusion 7 is greater than the depth of the small hole 6, so that when the blocks 2.2 are stacked one above the other, a gap is formed between the upper and lower blocks 2.2 into which the filler 43 enters. Moreover, three grooves 8 are provided on the outer periphery of the block 2 for venting air when filling the filler 3.

When making such a structure, first create block 2 at the factory.
is manufactured by autoclave curing.

On the other hand, at the site, a steel pipe 1 with an unbonded layer 4 formed on its inner surface is built vertically, and a block 2 carried to the site is suspended from above the steel pipe 1 and inserted. In this case, the protrusion 7 on the lower surface of the upper block is fitted into the small hole 6 on the upper surface of the lower block 2 and aligned.

After the block 2 has been inserted, a tremie tube is inserted into the hole 5 at the center of the block 2 from the top, and a filler material 3 such as concrete is poured from the bottom. At this time, air escapes from the groove 8 on the outer periphery of the block 2. Filling is completed,
Once the filler 3 has solidified, it is complete.

In this way, construction is easy and does not take much time.

By forming blocks, the block 2 can be produced by autoclave curing, and therefore columns with high compressive strength can be obtained.

Also, this is due to the internal filling and steel pipe! is in an unbonded state, so the steel pipe l and the filling inside behave as separate in the axial direction. Therefore, when compression J acts on block formation, axial strain occurs in the blockiness, but no axial strain occurs in the steel pipe 1. Therefore, by applying the Mises yield condition, the confining effect of the steel pipe 1 due to circumferential stress can be fully exhibited, and as a result, the strength against compressive loads can be improved, and the cross-sectional area can be reduced. be able to.

In addition, in the above description, when inserting the block 2 into the steel pipe 1, it was stated that it is simply suspended, but as a means for suspending it, a jig 1O as shown in FIG. 3 may be used. The tip of this jig 10 is inserted into the hole 5 provided in the center of the block 2. The tip of the jig 10 can be inserted into the hole 5 while it is normally closed as shown by the solid line. A stopper 11 is provided which holds the block 2 in a fixed position.

Alternatively, a jig 20 as shown in FIG. 4 may be used. In this case, a cross-shaped stopper 21 is attached to the tip of the jig 20, and a cross-shaped slit 22 that matches the jig is provided in the hole 5 of the block 2. When inserting the block into the hole 5 of the block 2, align the cross-shaped stopper 21 and the cross-shaped slit 22, and after inserting, slightly rotate the shell 20 around the axis so that the block can be held in a suspended state. This is what I did.

Alternatively, the block 2 may, of course, be simply hung by a wire. In that case, if the wire is hung in the groove provided on the outer periphery of the block 2, it will be easier to pull it out.

Further, in the above embodiment, small holes 6 and projections 7 are provided on the upper and lower surfaces of the block 2, respectively, and by aligning them, the blocks 2.2 are aligned and a gap is created between the blocks 2.2. However, it may be arranged as shown in FIG.

That is, a radial 1M33 extending from the center hole 5 is provided on the upper surface of the block 32, and thereby the block 3
2. When aligning blocks 3 and 32, ensure that there is a gap for the filler to wrap around, and for positioning, block 3
The pipe 34 is arranged on the inner surface of the steel pipe 1 along the groove 8 on the outer periphery of the steel pipe 1 for positioning. This tube 34 is designed to be gradually removed when the filling material 3 is placed.

Further, in the above embodiment, the case of a column having a circular cross section was illustrated, but the present invention is not limited to this, and can be applied to a square column as shown in FIG. 6, or other polygonal shapes or piles. Of course. In FIG. 6, 41 is a rectangular interpipe, and 42 is a rectangular block.

Furthermore, in the above embodiments, the case where the unpond layer 4 is provided has been described, but it is not always necessary to provide the unpounded layer 4.

In addition, in the above embodiment, the block 2 (concrete was used as the material or filler, mortar, other hydraulic materials, soil, sand, metal powder, etc.)
This may be used instead of a structural material whose compressive strength increases when consolidated, such as glass powder, plastic, viscosity, etc.

In addition, it is a good idea to increase the strength of concrete by inserting reinforcing bars into the concrete or placing prestressed steel.

[Effects of the Invention] According to the present invention, since the structural material to be filled into the steel pipe is made into blocks, on-site construction can be reduced and construction time can be shortened.

Also, since it is made into blocks, high-strength blocks can be manufactured in factories through autoclave curing, etc. For this reason, the strength of the block, which is the filling material inside the steel pipe, can be made high, so that the compressive strength of the entire filled and gripped pipe can be increased.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, FIG. 2 is a perspective view of a block of the same embodiment, FIGS. 3 and 4 are explanatory diagrams of the case where the block is inserted into a steel pipe, and The figure is a perspective view of another embodiment of the present invention, particularly showing the block.
The figure is a perspective view of an embodiment in which the present invention is applied to a rectangular column. l, 41... steel pipe, 2, 32.42...
・Block, 3... Filler, 4... Unbond treatment layer, 5... Hole, 6... Small hole, 7
...protrusion, rise, 8...concave groove. Shimizu CorporationFigure 1Figure 2Figure 3Figure 4Figure 5

Claims (1)

[Claims] In a filled steel pipe structure used as a pillar or pile, a large number of cylindrical or polygonal blocks made of structural material with dimensions slightly smaller than the inner circumference of the steel pipe are inserted into the steel pipe, and the blocks are spaced between each other and between the blocks and the steel pipe. A block-filled steel pipe structure characterized by filling the gaps between the blocks with a structural filler.