Building repairing method and non-structural wall structure

Abstract

To suppress reduction of an earthquake-resistant strength caused by passage of piping through a non-structural wall.SOLUTION: A through-hole 13 is formed in a non-structural wall 10 by removing concrete 11 leaving a reinforcement 12 with respect to the non-structural wall 10 made of reinforcement concrete. Rust-proofing processing is performed for the reinforcement 12 exposed through formation of the through-hole 13. Pipes are attached to both sides sandwiching the non-structural wall 10 so as to communicate via the formed through-hole 13. In forming the through-hole 13, a water leakage prevention measure may be taken for the indoor side of the non-structural wall 10, and the through-hole 13 may be bored from the outdoor side of the non-structural wall 10 by using a water jet.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a method for renovating an existing building. [Background technology]

[0002] Patent Document 1 discloses a water jet nozzle device used for drilling holes in concrete structures. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-096001 Summary of the Invention [Problem to be solved by the invention]

[0004] In the past, when drilling sleeves into non-structural walls in renovation work on existing buildings, the structure was chipped away to create a large opening larger than the required sleeve, the reinforcement that interfered with the sleeve was cut and removed, and reinforcement was placed around the sleeve to make up for the removed reinforcement, and then concrete was poured. However, no matter how much reinforcement is applied, it is impossible to avoid a decrease in seismic resistance due to cutting and removing part of the reinforcement. Furthermore, as the scale of the construction work will be large, it will be difficult to carry out the renovation work while continuing to use the building. The present invention aims to solve such problems, for example. [Means for solving the problem]

[0005] A through-hole is formed in a non-structural wall made of reinforced concrete by removing the concrete while leaving the reinforcing bars in place. The reinforcing bars exposed by forming the through-hole are then treated with an anti-corrosion treatment. Pipes are attached to both sides of the non-structural wall so that they communicate via the formed through-hole. [Effects of the Invention]

[0006] Since the through holes are formed by removing the concrete while leaving the reinforcing bars in place, the reduction in earthquake resistance strength can be minimized. In addition, the scale of construction can be kept small, so renovation work can be carried out while the building continues to be in use. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 10 is a plan cross-sectional view showing an example of a miscellaneous wall. [Figure 2] FIG. [Figure 3] FIG. 10 is a cross-sectional plan view showing an example of a through-hole forming step. [Figure 4] FIG. [Figure 5] FIG. 10 is a cross-sectional plan view showing an example of a pipe installation step. [Figure 6] FIG. DETAILED DESCRIPTION OF THE INVENTION

[0008] The non-structural wall 10 will be described with reference to FIGS. "Miscellaneous walls" refer to walls that are not earthquake-resistant, such as sleeve walls, hanging walls, and waist walls, among the structural framework of a reinforced concrete building. The non-structural wall 10 includes, for example, concrete 11 and reinforcing bars 12. The concrete 11 is, for example, substantially flat and substantially perpendicular to the ±Y directions. The reinforcing bars 12 are arranged in the concrete 11, and for example, a plurality of reinforcing bars extending in the ±X directions and a plurality of reinforcing bars extending in the ±Z directions are arranged in a grid pattern.

[0009] Next, a procedure for passing piping through the non-structural wall 10 while continuing to use the building in repair work on a building currently in use that has such non-structural wall 10 will be described.

[0010] (1) Through-hole formation process As shown in Figures 3 and 4, a through hole 13 is formed in a non-structural wall 10, penetrating the wall. The through hole 13 penetrates the wall 10, for example, from the -Y side surface to the +Y side surface of the wall 10, along a direction substantially parallel to the thickness direction (±Y direction) of the wall 10. At this time, only the concrete 11 is removed, leaving the reinforcing bars 12. For example, a water jet is used to remove the concrete 11 within the area of ​​the through hole 13. Because the reinforcing bars 12 are not cut, there is almost no reduction in seismic strength. Although the removal of the concrete 11 may slightly reduce the seismic strength, because the non-structural wall 10 is not a seismic wall, the reduction in seismic strength will not be a problem if the diameter of the through hole 13 is approximately 300 mm. Since there is almost no decrease in seismic resistance, there is no need to insert reinforcing bars. Since there is no need to insert reinforcing bars, there is no need to remove a wide area of ​​concrete 11 beyond the range of through-hole 13, and there is no need to re-pour concrete into the area where concrete 11 has been removed beyond the range of through-hole 13. This makes it possible to keep the scale of construction small, and the renovation work can be carried out while the building continues to be in use.

[0011] Waterjets also have the advantage of producing relatively little noise. However, no matter how quiet the noise, using a water jet indoors, such as in an office, makes it difficult to use the same room as usual. Therefore, when the non-story wall 10 is a wall that separates an interior space such as a room from an exterior space such as a corridor, the through hole 13 is formed by drilling the non-story wall 10 from the exterior side toward the interior side. In this case, when the through-hole 13 reaches the surface on the indoor side, a water jet will spray out from there, so measures to prevent water leakage should be taken in advance, such as covering the indoor side with a waterproof sheet. This allows the renovation work to proceed while the rooms separated by the non-permanent wall 10 can be used as usual.

[0012] (2) Rebar rust prevention process Since the through-hole 13 is formed by removing the concrete 11 while leaving the reinforcing bar 12 in place, the reinforcing bar 12 is exposed inside the through-hole 13. If this is left as it is, there is a possibility that the reinforcing bar 12 will rust. For this reason, anti-rust treatment is applied to the exposed portion of the reinforcing bar 12 exposed in the through hole 13. This makes it possible to prevent the exposed reinforcing bar from rusting.

[0013] (3) Piping installation process Next, a pipe is attached to the formed through hole 13. Here, if the diameter of the pipe to be installed is larger than the spacing between the reinforcing bars 12, the pipe cannot be inserted through the through hole 13. Therefore, instead of inserting the pipes through the through holes 13, pipes are attached to both sides of the non-reinforced concrete wall 10 and communicate via the through holes 13. This allows pipes with a diameter larger than the spacing between the reinforcing bars 12 to be attached while leaving the reinforcing bars 12 in place.

[0014] 5 and 6, fittings 21a and 21b are attached to both sides of the through-hole 13, and piping is attached to the fittings 21a and 21b. The fittings 21a and 21b may be fixed to the non-structural wall 10 using anchor bolts or the like as shown, or they may be fixed to the non-structural wall 10 by fixing the fittings 21a and 21b to each other with a fixing means that passes through the through-hole 13. Of course, the pipes may be attached directly to the non-stick wall 10 instead of using the joints 21a and 21b.

[0015] The above-described embodiment is an example for facilitating understanding of the present invention. The present invention is not limited thereto, and includes various modifications, changes, additions, or omissions without departing from the scope defined by the appended claims. This can be easily understood by those skilled in the art from the above description.

[0016] Currently, various measures are being taken towards carbon neutrality by 2050, and it is widely recognized that the most important of these is reducing CO2 emissions from everyday life and business activities within buildings. In response, measures are planned to legally mandate the promotion of ZEB in newly constructed buildings, but ZEB and energy-saving measures for existing buildings that emit large amounts of CO2 other than new construction are still in the early stages of being discussed. One of the reasons why it is difficult to adapt existing structures to ZEB standards is the difficulty of renovating existing buildings. This is because renovations inevitably require opening sleeves for equipment in parts of the structural frame, which has been pointed out as having the potential to reduce the building's earthquake resistance, making renovations difficult to implement. The proposed method allows the equipment sleeve to be opened without significantly reducing the structural performance of the RC non-structural walls (RC sleeve walls next to the columns) of the structural frame. The sleeve is formed by removing only the concrete while leaving the reinforcing bars in place, so there is no need to chip away at the structure to create a large opening larger than the required sleeve, remove the reinforcement that interferes with the sleeve, apply reinforcement around the sleeve to make up for the removed reinforcement, and then pour concrete, which reduces noise, vibration, and dust and allows for "construction without removing the structure." Only the concrete is chipped away with a water jet, leaving the rebar in place, which is then coated with an anti-rust paint and pipes are installed inside and outside. In the case of RC walls that have not been evaluated as earthquake-resistant, as long as the rebar is not cut, a sleep of about 300 mm will not cause significant damage in an earthquake. [Explanation of symbols]

[0017] 10 Miscellaneous wall, 11 Concrete, 12 Reinforcement bar, 13 Through hole, 21a, 21b Joints.

Claims

1. For a non-reinforced concrete wall, a through hole is formed in the non-reinforced concrete wall by removing the concrete while leaving the reinforcing bars, The reinforcing bar exposed by forming the through hole is subjected to rust prevention treatment, Pipes are attached to both sides of the non-removable wall so as to communicate through the formed through-holes. Building renovation methods.

2. In forming the through holes, Measures to prevent water leakage are taken on the interior side of the miscellaneous wall, The through hole is drilled from the outside of the non-slip wall using a water jet. The building renovation method according to claim 1.

3. Reinforcement bars arranged in a grid pattern, A substantially flat concrete plate with the reinforcing bars embedded therein; Equipped with The concrete has a through hole that penetrates the concrete from one surface to the other surface of the concrete, The reinforcing bar has an exposed portion that crosses the through hole, The exposed portion of the reinforcing bar is subjected to rust prevention treatment. Miscellaneous wall structure.

4. a pair of joints that are attached to the concrete with the concrete sandwiched therebetween and that can be attached to a pair of pipes so that they communicate with each other via the through-holes; The non-woven wall structure of claim 3 further comprising:

5. A pair of pipes that communicate with each other through the through hole The non-woven wall structure according to claim 3 or 4, further comprising:

Images