JPH04166561A - Application of slab piercing hole - Google Patents

Abstract

PURPOSE:To simplify the application and reduce the processes and decrease the construction time, labours and costs, by arranging two architrave-shaped blocks expanding outward and upward so as to hold a temporary column or the like on a slab mold. CONSTITUTION:A square shaped plane block having a pierced hole 7 in the center is divided into two and two blocks 3 on the architrave having upwardly and outwardly expanding shape in the section are arranged on a slab mold 2 so as to hold a temporary column 1. And a slab concrete 4 is placed at the part except the block 3 on the slab mold 2. And next, after the temporary column 1 is removed, a lid block 5 is inserted in the pierced hole 7 from the upper side to hold it by the peripheral protrusions 8 of the block 3. And further, reinforced bars 11 are arranged in the space surrounded by the block 3 and the lid block 5 and repair concrete 12 is placed in the space to finish the repair of the pierced hole 7.

Description

[Detailed Description of the Invention] Industrial Application Field 1 The present invention systematically repairs the partition formwork of a through-hole such as a temporary support that is erected through a slab of a building, and the repair of the through-hole. The present invention relates to a method for constructing a slab through hole.

[Prior Art] Conventionally, as shown in FIG.
is provided at the periphery of the through hole 7 of the horizontally laid slab formwork 2, surrounding the temporary support 1 and the like.

This partition formwork 13 is usually a plate-like formwork made of wood or steel, and is made by a carpenter or the like in a box-shaped form surrounding the temporary support 1 etc., and the through-hole 7 is partitioned off.

Then, the slab concrete 4 is placed on the slab formwork 2 so as not to flow into the through hole 7. At this time, a plurality of insertion reinforcements (not shown) are provided to penetrate through the partition formwork 13, one of the insertion reinforcements is buried in the slab concrete 4, and the other is arranged so as to protrude into the through hole 7. Ru.

After the construction is completed in this manner, the temporary supports 1 and the like are removed, and the partition formwork 13 is removed by a worker dismantling the slab concrete 4 hardening machine. Then, a bottom cover is applied to the lower surface of the through hole 7 using a formwork made of wood or steel, reinforcing reinforcing bars are set in the through hole 7 by reinforcing steel work, etc., and repair concrete is poured. Thereafter, the bottom cover and the slab formwork 2 were removed by a demolition worker while checking the degree of hardening of the repair concrete, and the repair of the through hole 7 was completed.

[Problems to be Solved by the Invention] In the conventional construction method for through-holes such as temporary supports, it is necessary to insert reinforcing bars into the through-holes from within the slab concrete so that the repair concrete poured into the through-holes during post-construction does not fall. are arranged through the Therefore, it is necessary to provide through holes in the partition formwork to allow the inserts to pass through, and the work of assembling and dismantling the partition formwork is quite troublesome, and this work requires skilled workers such as carpenters and demolition workers. Even if I did it, it was time consuming.

In addition, repairing through-holes after temporary supports have been removed requires a large number of carpenters and demolition workers, as the construction process has become more diverse, such as attaching a bottom cover to the bottom of the through-hole using wooden or steel formwork. Alternatively, reinforcing steel work, etc. was required, and it took a lot of time and effort.

Furthermore, because the partition formwork was removed after the slab concrete had hardened, repair work could not be carried out immediately, and the through holes were temporarily left open.

Therefore, it is necessary to take safety management measures such as covering the through hole from above or providing handrails to prevent workers from falling.

SUMMARY OF THE INVENTION In view of the variety of construction methods around slab through holes, an object of the present invention is to provide a method for constructing slab through holes that is easy to construct and requires fewer work steps.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a method for constructing a through-hole for a temporary post or the like to be erected through a slab of a building. A frame-shaped block having a through hole is formed into two parts, and
The blocks are formed so as to have an outer edge facing upwards, and the frame-shaped blocks are combined to sandwich temporary supports and the like, and arranged in a slab form. Then, the first step is to pour concrete on the slab formwork except for the inside of the frame-shaped blocks.
After completing the process and removing the temporary supports, etc., insert the lid block from above into the through hole partitioned by the frame-shaped block.
The second step is to hold the frame-shaped block on the peripheral wall, and the third step is to place reinforcing reinforcing bars in the space surrounded by the frame-shaped block and the lid block, and to pour repair concrete into the same space.
It consists of processes.

It should be noted that a structure in which a protrusion is provided at the lower end of the inner wall of the frame-shaped block, a protrusion that is engaged with the protrusion is provided on the lid block, and an insertion line is further protruded from the outer wall of the frame-shaped block is also adopted. good.

It is preferable that the frame-shaped block and lid block used in the construction method of the slab through-hole constructed in this manner be made of precast concrete or fiber-reinforced precast concrete.

[Function] In the above-mentioned slab through hole construction method, the construction period can be shortened because the partition wall of the through hole is completed by simply placing two frame-shaped blocks on the slab formwork with temporary supports sandwiched between them. At the same time, it is easy to install.

In addition, since the picture frame-shaped blocks are held in the slab concrete by insert reinforcement, they will not fall even if the slab concrete expands and contracts due to creep or temperature changes.Furthermore, since the blocks are integrated as part of the slab concrete, they can be dismantled easily. No work is required.

In addition, since the lid block can be inserted into the frame-shaped block and held on the peripheral wall of the lid block immediately after pulling out the temporary support, etc., it is possible to completely prevent workers from falling, and also to repair through-holes. can be completed quickly.

[Example] Embodiments of the present invention will be described with reference to FIGS. 1 to 4.

- Temporary supports such as 8W4 will be erected as structural support members for the building. A slab formwork 2 is assembled horizontally at an arbitrary height of the temporary support l, and a frame-shaped block 3 is installed on the slab formwork 2 around the through hole of the temporary support l so as to surround the temporary support l. Ru. After that, slab formwork 2
Slab concrete 4 is placed in the area excluding the inside of the upper frame-shaped block 3. After the temporary support l is removed, the lid block 5 is fitted into the frame-shaped block 3 to prevent it from falling.

Both the frame-shaped block 3 and the lid block 5 are made of precast concrete, and are manufactured at a factory. The frame-shaped block 3 has reinforcing reinforcing bars 6 arranged inside, and the block has a rectangular shape with a through hole 7 in the center and is divided into two parts, each of which has a U-shape in plan. It is shaped like a parallelogram, and its cross section is shaped like a parallelogram with the outer edge slanting upward. Further, a circumferential protrusion 8 is provided at the lower end of the inner wall of the frame-shaped block 3, and a rod-shaped insertion line 9 is provided on the outer wall of the block 3.
It is manufactured in one piece so that it protrudes. The lid block 5 has a substantially rectangular cross section, and is provided with a protrusion lO that can be engaged with the circumferential protrusion 8 of the frame-shaped block 3 at its upper end.

Although precast concrete was used as the material for the frame-shaped block 3 and lid block 5 in this embodiment, the material is not limited to this, and fiber-reinforced precast concrete mixed with various types of fibers may be used. Refractory materials may also be used. In addition, the planar shape of the frame-shaped block 3 is not limited to a rectangular shape (and the division position and number of divisions are not limited to those described above. In this case, the planar shape of the lid block 5 is not limited to the rectangular shape. It is formed so that it can be fitted into the through hole.

Next, a method of constructing a slab through hole using the frame-shaped block 3 and lid block 5 will be systematically explained.

As the first step, as shown in FIG.
are arranged on the slab formwork 2 in a planar rectangular shape so as to sandwich the temporary support l, and the through holes 7 are partitioned. And, except for the inside of the frame-shaped block 3 on the slab formwork 2,
Slab concrete 4 is poured onto slab formwork 2 to a predetermined thickness.

As a second step, as shown in FIG. 2, immediately after the temporary support l is removed, the lid block 5 is fitted from above into the through hole 7 of the frame-shaped block 3, and the protrusion lO of the lid block 5 is inserted into the frame-shaped block 3. It is latched to the circumferential protrusion 8 of the block 3 to prevent it from falling.

In the third step, as shown in FIG. 3, reinforcing reinforcing bars 11 in the form of a planar lattice are placed in the space surrounded by the frame-shaped block 3 and the lid block 5, that is, on the upper side of the lid block 5. Repair concrete 12 is placed to complete the repair of the through hole 7.

Note that the slab formwork 2 is removed at an appropriate time depending on the hardening status of the slab concrete 4.

[Effects of the Invention] The method for constructing through-holes in slabs of the present invention requires only an electrician or carpenter at the site, and the construction is simple and requires fewer construction steps. I can do it.

Further, since the through hole can be covered immediately after the temporary support etc. is removed, safety management measures such as fall prevention are complete, and there is no cost involved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the first step of the method for constructing the slab through hole of the present invention, FIG. 2 is a sectional view showing the second step of the method for constructing the slab through hole, and FIG. 3 is a sectional view showing the second step of the method for constructing the slab through hole of the present invention. Fig. 4 is a perspective view of a frame-shaped block used in the above-mentioned slab through-hole construction method;
FIG. 5 is a cross-sectional view showing a conventional method for constructing through-holes in slabs. 2; Slab formwork 3: Frame-shaped block 4; Slab concrete 5: Lid block 7; Through hole
8: Circumferential protrusion 9; insertion bar lO; protrusion

Claims (3)

[Claims] (1) In a method for constructing through-holes for temporary supports etc. that are erected through the slab of a building, a frame-shaped block with a through-hole in the center is formed into two parts using concrete material in advance, and The same block is formed to expand outward upwards, and the frame-shaped blocks are placed on the slab formwork with temporary supports sandwiched between them, and the part of the slab formwork excluding the inside of the frame-shaped blocks is After the first step of pouring concrete and the removal of the temporary supports, etc., the lid block is inserted from above into the through hole partitioned by the frame-shaped blocks and held on the peripheral wall of the frame-shaped blocks. 2
and a third step of placing reinforcing reinforcing bars in a space surrounded by a frame-shaped block and a lid block, and pouring repair concrete into the space. Method. (2) A protrusion is provided on the lower end of the inner wall of the frame-shaped block, and a protrusion that is engaged with the protrusion is provided on the lid block,
2. The method for constructing a slab through hole according to claim 1, further comprising making the insertion reinforcement protrude from the outer wall of the block. (3) The method for constructing a slab through hole according to claim 1, wherein the frame-shaped block and the lid block are made of precast concrete or fiber-reinforced precast concrete.