JP6552863B2 - How to beat the outer wall - Google Patents

Description

  The present invention relates to a method of boosting the outer wall.

  Conventionally, as a method of increasing the number of existing outer walls in seismic retrofitting or the like, there is a method of assembling a mold frame outside the existing outer wall and placing concrete between the outer wall and the mold frame (for example, see Patent Document 1). In this case, the wall core position of the outer wall after the increased number of shots may be shifted to the outside to increase the building area and exceed the allowable building coverage ratio.

JP, 2014-105425, A

  Therefore, in order to prevent the building after renovation from exceeding the allowable building coverage rate, there is a demand for setting a formwork on the indoor side of the existing outer wall and placing concrete to increase the wall thickness. In this case, it is necessary to lay a pipe for placing concrete in the room, and it is often impossible to use the room while placing concrete.

  SUMMARY OF THE INVENTION In view of the above facts, the present invention aims to provide a method of smashing an outer wall, which can use a room while placing concrete.

The method for increasing the outer wall according to the first aspect of the present invention comprises the steps of: installing a mold on the indoor side of the outer wall of a building;
The method further comprises the steps of: forming a through hole in the outer wall or the slab; and placing concrete between the outer wall and the formwork from outside the room through the through hole.

According to the outer wall reinforcement method of the first aspect, a concrete placement pipe is laid outside the room, and the concrete is placed between the outer wall and the formwork through a through hole formed in the outer wall or slab. For this reason, it is not necessary to lay the piping for placing concrete in the room. For this reason, the room can be used while placing concrete.
The room is a room in which the formwork is installed, and the outside is a space outside the outer wall, that is, the outside or a space separated by a slab.

  According to the second aspect of the present invention, the outer wall increasing method is the outer wall increasing method according to the first aspect, wherein the mold is a form with a reinforcing bar or a steel corrugated form, and is integrated with the placed concrete. .

According to the method of the second aspect of the present invention, the formwork and the additional wall are integrated. For this reason, there is no need to remove the formwork after concrete placement, and while the indoor work is reduced, the formwork works effectively on the structural load resistance of the outer wall.
In addition, in the case of a rebar-attached formwork, the installation work of the additional wall is completed simultaneously with the installation of the formwork, so that the construction becomes efficient.

  According to the method of increasing the outer wall according to the present invention, the room can be used while the concrete is being placed.

It is an elevation sectional view showing the method of increasing the number of the outer wall in the first embodiment of the present invention. It is a top view which shows the increase method of the outer wall in 1st Embodiment of this invention. It is a perspective view which shows the method of increasing the outer wall in 2nd Embodiment of this invention. It is a partial elevation sectional view showing the method of increasing the outer wall according to another embodiment of the present invention.

First Embodiment
Hereinafter, the outer wall increasing method according to the first embodiment will be described with reference to the drawings.
The outer wall increasing method according to the present embodiment is to place concrete on the indoor space 20 side of the outer wall 11 of the reinforced concrete building 10 to increase the wall thickness of the outer wall 11 to improve durability.

(Bar arrangement work)
As shown in FIGS. 1 and 2, the finishing material on the indoor space 20 side of the outer wall 11, the upper beam 12, the lower slab 14, the column 16 and the column 17 is removed, and the outer wall 11, the upper beam 12, the lower slab 14, A stud bolt (post-installed anchor bolt) 41 is attached to each of the columns 16 and 17.
Further, a spiral bar (split reinforcing bar) 42 is arranged in the vicinity of the outer wall 11, the upper beam 12, the lower slab 14, the column 16, and the column 17, and fixed to the stud bolt 41 with a binding bar, and the wall bar 43 is arranged. Make a mistake.

(Form setting installed)
A wooden formwork 30 is installed on the indoor space 20 side of the outer wall 11, and an additional space P surrounded by the upper beam 12, the lower slab 14, the pillar 16, the pillar 17, the wooden formwork 30, and the outer wall 11 is formed. Form.
In FIGS. 1 to 4, a form support for supporting the wooden form 30 is omitted.

(Formation of through holes)
Next, the through-hole 50 is formed from the outdoor 21 side of the outer wall 11 using a drill or the like. The through hole 50 has a diameter into which the tip portion (for example, a flexible hose) of the concrete delivery pipe 60 can be inserted, and in the present embodiment, has a diameter of about 100 mm.
A plurality of through holes 50 are formed in the horizontal direction at the height at which the spiral streaks 42 on the upper beam 12 side are disposed. In this embodiment, they are formed at equal intervals with a 1-meter pitch.

(Concrete casting)
Then, the tip portion of the concrete pumping pipe 60 laid outside the building 21 in the building 10 is inserted into the through hole 50 to cast concrete in the additional space P.
The concrete may be compacted by placing a vibrator on the outer surface of the mold 30 while placing the concrete in the additional space P. However, in order to reduce indoor work as much as possible, a vibrator is inserted from the through hole 50, Concrete compaction may be performed.
When concrete is cast to the lower part of the through hole 50, the through hole 50 is closed by a closing plate (not shown). The closing plate is provided with an injection hole and an air vent hole for injecting a non-shrink mortar.
Next, after waiting for the concrete to harden, the non-shrink mortar is poured from the injection hole of the closing plate, and when it is observed that the non-shrink mortar overflows from the air vent hole, the pouring is finished.
Since no aggregates are contained in the non-shrink mortar, the gaps between the stud bolt 41, the spiral muscle 42 and the wall muscle 43 are tightly filled.

(Withdrawal)
After hardening of the concrete, the wooden form 30 is removed, and the additional operation of the outer wall 11 is completed.

(Function)
The method of increasing the outer wall according to the first embodiment is as described above, and the operation thereof will be described below.

  According to the outer wall reinforcement method of the present embodiment, the concrete pressure feeding pipe 60 is all laid on the outdoor 21 of the building 10, so there is no need to lay the concrete pressure feeding pipe 60 in the indoor space 20. Thereby, while pouring concrete, indoor space 20 can be used. In addition, the pressure feeding path of the concrete can be shortened, and the pressure loss can be reduced.

On the other hand, when placing concrete from the indoor space 20 side, it is laid in the indoor space 20 via the window 18 and the entrance / exit 19 of the building 10 like the concrete pumping pipe 61 shown by the broken line in FIG. It is difficult to use the indoor space 20 while casting concrete. Moreover, the concrete pressure feeding path becomes complicated and the pressure loss is large.
Alternatively, in order to reduce the pressure loss, the concrete mixer 62 needs to be disposed in the indoor space 20, and the indoor space 20 can not be used, and the noise given to the surrounding room also needs to be considered.

In addition, since concrete is cast on the indoor space 20 side of the outer wall 11, removal of the finishing material before additional casting is easier than in the case where concrete is cast on the outdoor side 21. For example, in the case where a tile is attached to the outdoor side 21 of the outer wall 11, it is necessary to lift the tile. On the other hand, the work of removing the gypsum board and the wallpaper cloth on the indoor space 20 side is easy.
Similarly, the finishing operation after removal of the wooden form 30 is easier than when concrete is cast on the outdoor side 21.

  Moreover, since it is not necessary to lay the concrete pressure feeding pipe 60 in the indoor space 20, curing of the laying route is unnecessary. Therefore, the efficiency of the construction work is good.

  Moreover, since concrete is laid on the indoor space 20 side of the outer wall 11, the wall core position after the increased hitting does not shift to the outdoor 21 side. As a result, the building 10 after the additional hitting does not exceed the allowable building coverage rate. In addition, even when the wall retraction distance from the adjacent land boundary is specified, it is possible to avoid that the separation distance between the surface of the outer wall 11 and the adjacent land boundary is less than the allowable retraction distance.

  In addition, since the through holes 50 are formed after the installation of the wooden form 30, the dust and fragments of concrete do not fly into the indoor space 20 as the holes are made.

Second Embodiment
Next, a method for increasing the outer wall according to the second embodiment will be described. In addition, about the part which becomes the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  As shown in FIG. 3, the formwork in the present embodiment is a rebar-formed formwork 31. The form 31 with a reinforcing bar is formed by welding a reinforcing bar 31b assembled in a truss shape to a steel plate 31a. For this reason, it is not necessary to arrange the wall muscle 43 (see FIG. 1).

  Further, the reinforcing bar 31b is fixed to the concrete, whereby the reinforcing bar-attached formwork 31 is integrated with the additional wall. For this reason, there is no need to remove the reinforcing bar-attached formwork 31 after hardening the concrete.

(Function)
The method of increasing the outer wall according to the second embodiment is as described above, and the operation thereof will be described below.

According to the method of additionally driving the outer wall of the present embodiment, the construction is efficient because it is not necessary to arrange the wall reinforcement 43 and it is not necessary to remove the reinforcement with frame 31.
Further, since the reinforcing bar-attached formwork 31 is configured by welding the reinforcing bar 31b assembled in a truss shape to the steel plate 31a, the rigidity is high and the bending is difficult to occur. Thereby, the form support for supporting the form 31 with rebar can be made into a simple structure.

Other Embodiments
The embodiment of the present invention is not limited to the above, and it goes without saying that various modifications can be made without departing from the scope of the invention.

For example, although the through holes 50 are formed at the height at which the spiral streaks 42 close to the upper beam 12 are disposed, the invention is not limited thereto.
For example, the through hole 50 may be formed at a height close to the lower beam 13, and concrete may be pressed in from the lower part of the additional space P. Thereby, breathing can be reduced and the strength of the concrete of the additional wall can be increased.

Moreover, although the diameter of the through-hole 50 is about 100 millimeters, it is not limited to this. If it is possible to insert the tip portion of the concrete delivery pipe 60, it may be about 50 to 150 mm.
Moreover, although the pitch of the through holes 50 is about 1 meter, it is not limited to this. For example, if it is about 500 mm, it is easy to place even a low-flowing rich mix of concrete.
On the contrary, when pouring highly fluid concrete, the pitch can be made larger than 1 meter, for example, about 2 meters.

  Moreover, although the through-hole 50 shall be formed after installation of the wooden form 30, it is not restricted to this. For example, the through hole 50 may be formed prior to the laying operation. If the through holes 50 are formed prior to the laying operation, the wall muscle 43, the spiral muscle 42 and the like will not be damaged by a drill or the like for forming the through holes 50.

Moreover, although the through-hole was formed in the outer wall 11, it is not restricted to this.
For example, as shown in FIG. 4, the through holes 51 may be formed in the upper slab 15, and concrete may be poured from the upper space 22 into the additional casting space P. If the upper space 22 is a machine room, an empty room, etc., even if the concrete delivery pipe 60 is laid, there is no hindrance to using the interior space of the building. Further, even in the case where the outer wall 11 on the second floor or more is additionally hit, it is not necessary to assemble a scaffold for laying the concrete delivery pipe 60 on the outside 21.
In this case, the pouring opening 53 may be provided in the upper part of the wooden form 30, and the receiving plate 32 may be provided so that the concrete flows to the pouring opening 53. Alternatively, a flexible hose (not shown) attached to the end of the concrete delivery pipe 60 may be inserted into the pouring opening 53.

  Alternatively, through holes may be formed in the lower slab 14 and concrete may be pumped from the lower space 23. In this manner, the concrete pressure feeding pipe 60 can be laid at various places around the indoor space 20 in accordance with the use situation of the building 10.

The formwork is not limited to the wooden formwork 30 or the formwork 31 with reinforcing bars.
For example, a steel corrugated form such as a deck plate may be used. The deck plate is a member mainly used to form a composite floor by integrating with cast-in-place concrete and has high bending rigidity. Thereby, the bending at the time of placing concrete is suppressed. Further, if the surface of the deck plate is embossed, a high fixing force with the concrete can be obtained.
Moreover, a deck plate may be used for the steel plate 31a used for the rebar form 31, and the rebar form 31 may be a half PCa plate with a truss-like rebar. Since the half PCa plate also has a high bending rigidity, bending when the concrete is placed is suppressed.

Further, the additional casting space P in which the concrete is cast is a space surrounded by the upper beams 12, the lower slabs 14, the columns 16, and the columns 17, but is not limited thereto.
For example, it may be surrounded by walls instead of pillars. In addition, in a non-beam building such as a flat slab, it may be surrounded by a slab instead of a beam.
The outer wall increasing method according to the present invention can be applied to various buildings such as a reinforced concrete structure and a reinforced steel concrete structure regardless of the structure type such as a ramen structure and a wall structure.

10 Building 11 Exterior wall 20 Indoor space (indoor)
21 Outdoor (outdoor)
22 Upper space (outdoor)
23 Lower space (outdoor)
30 wooden formwork (formwork)
31 Corrugated steel formwork (formwork)
50, 51 through holes

Claims (3)

A process of installing a formwork on the indoor side of the outer wall of the building;
Forming a through hole in the outer wall ;
Placing concrete between the outer wall and the formwork from outside the room through the through hole. Installing a mold on the indoor side of the outer wall of the building;
  Forming a through hole in the slab;
  Placing the concrete between the outer wall and the formwork from the outside through the through-hole. The method according to claim 1 or 2 , wherein the form is a reinforced form or a steel corrugated form and integrated with the cast concrete.

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