JP2001132003A - Repair wall construction of existing underground structure and construction method for repair wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide repair wall construction of the existing underground structure, capable of completely waterproofing a wall in a basement or the like of the existing building, and at the same time, improving its earthquake resistance. SOLUTION: Repair wall construction of the existing underground structure is so constituted, that it can promote earthquake resistance by preventing the water leakage of the existing wall in a basement or the like, and at the same time, by executing reinforcement in terms of strength. Execution of work is so carried out that a waterproofing membrane 3 formed by applying a bentonite 3b to a resin membrane 3a is stuck on a wall surface W, and that a reinforcing plate (steel plate) 1 is fixed to the surface side in a state of a specific interval with a plurality of mounting bolts 2. Shrinkage-compensating mortar is poured into a gap G, where a partition is formed between the waterproofing membrane 3 and the reinforcing plate 1 to form a mortar layer 4. By the constitution, the waterproofing membrane 3, mortar layer 4 and reinforcing plate 1 are integrally connected to each other to construct a strong repair wall. Since the repair wall is fixed to the existing wall with the mounting bolts 2, the repair wall is completely waterproofed, and at the same time, it is reinforced to promote earthquake resistance in terms of strength.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a repairing wall structure for an underground building and a method for constructing a repairing wall by reinforcing a basement wall of an existing underground building and providing waterproofing means.

[0002]

2. Description of the Related Art At present, many underground buildings, including buildings having a basement, exist in underground buildings.
They have been struggling to secure strength and countermeasures against water leakage due to aging.

FIG. 4 shows a wall structure of a basement of a public building. As shown in the figure, the floor surface F, ceiling C and wall surface W of the basement are all covered with reinforced concrete, and each inner surface is subjected to waterproof treatment with cinder concrete S.

[0004] However, even if such a treatment is performed, groundwater or the like seeps out of the wall surface W, and cracks or cracks gradually occur, and groundwater flows in. Usually, a gutter G for preventing inflow of groundwater is provided in order to predict that such groundwater flows into the room and to protect the floor surface of the room. In addition, since the wall surface W becomes dirty due to waterproofing, and the water in the gutter G impairs the appearance of the room, a decorative wall K is provided in a room where the gutter is hidden.

[0005]

However, as long as the inner wall surface W of an existing underground building is made of concrete permeable to moisture, it is inevitable that groundwater leaks into the room. In addition, if the wall surface is deteriorated and cracks or cracks occur, water leakage from here is inevitable. For this reason, it is usually necessary to receive such water leakage in a gutter provided on the floor surface along the wall surface, collect the water leakage in a drainage tank, and discharge the water outdoors by a pump. For this reason, the cost for drainage is high, which causes a high running cost in the underground building. As described above, the leakage of the basement causes a problem that an effective space of the basement or the like is taken up by installing a gutter, a drainage tank, and a decorative wall, and the effective area of the basement or the like is reduced accordingly.

[0006] Also, the wall of an existing underground building has been weakened due to aging, and has been damaged by the invasion of a large earthquake, and as a result, the entire building has been collapsed. Furthermore, weakening due to aging of concrete walls causes accidents in which concrete blocks lost from walls and ceilings collapse or fall even without an earthquake. However, existing underground structures have not been adequately prepared for these accidents. For this reason, there is a problem that a dangerous state is often left.

Accordingly, an object of the present invention is to firstly reduce the burden of drainage costs by completely preventing water leakage from the wall surface of an existing underground building. And the second
Another object of the present invention is to increase the effective use area of an underground building by eliminating the need for installing a decorative wall or the like used in a conventional underground building. Thirdly, the purpose is to improve the earthquake resistance and prevent danger by reinforcing the existing walls.

[0008]

In order to achieve the above object, a repair wall structure for an existing underground building according to the present invention comprises:
A repair wall was constructed on the wall of an existing underground building, which provided both means for preventing water leakage and strengthening against earthquake.

The structure of the repair wall is such that a waterproof layer, a mortar layer and a reinforcing plate are integrally laminated on an existing underground wall, and this is fixed to the wall via mounting bolts.

[0010] The repair wall is provided with a waterproof layer provided so as to cover the surface of the existing wall, a reinforcing plate positioned opposite to the waterproof layer at a predetermined interval, and a partition formed between the reinforcing plate and the waterproof layer. And a mortar layer filled in the space. In the repair wall structure, the repair wall is fixed to an existing wall surface through a plurality of mounting bolts, and the inner wall surface and the repair wall are integrated.

Since the reinforcing plate suppresses the planar deformation of the wall surface, the repair wall can be made thin by adopting a high strength material such as a structural steel plate. Further, if the seam is joined by welding or the like, no gap is generated, so that it is possible to completely prevent water leakage.

The above-mentioned waterproof layer is constituted by a layer formed of an organic or inorganic paint or the like. Particularly, when the waterproof layer is formed using bentonite having a high swelling property, cracks and the like are generated in the bentonite layer. In addition, cracks and the like are self-repaired by water supply at the time of water leakage, which is effective for improving waterproofness.

As the above-mentioned grout mortar, a normal mortar may be used. However, if a non-shrink mortar is used instead, a bonding between the reinforcing plate and the mortar due to expansion and shrinkage actions during solidification. As well as increasing the force, the entire structure of the repair wall is strengthened by the occurrence of initial stress and the like, so that the earthquake resistance can be improved.

This repair wall structure can reliably prevent water leakage, and by integrating the existing wall and the repair wall, the seismic resistance can be improved by strengthening the wall and the concrete block can be prevented from falling. is there.

The construction of the repair wall described above is performed as follows. First, a waterproof layer is formed on the indoor side wall surface of an existing building. Next, a reinforcing plate is fixed via mounting bolts so as to face the waterproof layer at a predetermined interval. Next, grout mortar is poured into the space defined between the waterproof layer and the reinforcing plate, and the waterproof layer and the mortar layer and the mortar layer and the reinforcing plate are respectively bonded by solidifying the mortar, and the mounting bolts are used. A solid repair wall is constructed by joining them together.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 3, a repair wall H of the present invention is provided on an inner wall surface W and a ceiling C of a basement R. Reinforcement plate 1 located on the surface of repair wall H
Is formed by joining pieces cut to dimensions corresponding to the dimensions and shape of the wall surface (see FIG. 3). When this is seen from the inside of the basement, as shown in FIGS.
Are fixed to the wall surface W via the mounting bolts 2.

As an example of the reinforcing plate 1, a structural steel plate having a thickness of 6 mm, which is cut in advance in a size capable of being carried in and taking into consideration the layout on a wall surface, and having a mounting hole formed therein, is used. As the reinforcing plate 1, a building material such as ALC which is light and excellent in waterproofness may be employed in addition to the steel plate.

As a specific example of the waterproof layer 3, a bentonite sheet excellent in waterproofness is used. As shown in FIG. 2, the bentonite sheet 3 is formed by attaching bentonite 3b to one surface of a resin film 3a made of a synthetic resin sheet such as polyethylene to a predetermined thickness to form a sheet.

The waterproof layer 3 is preferably attached so that the bentonite 3b is in contact with the inner wall surface W. Since the bentonite 3b has a self-repairing property due to swelling of water as described above, even if there is water leakage from the wall surface, it can completely prevent water leakage by closing cracks and the like by the compressive action of bentonite particles on the surface of the wall surface. It is assumed that.

A mortar layer 4 is formed between the waterproof layer 3 and the steel sheet 1. The mortar layer 4 is obtained by injecting and filling grout mortar into a gap G defined by providing the steel sheet 1 so as to face the waterproof layer 3 at a predetermined interval, and solidifying the grout mortar. . The mortar layer 4 is joined to the synthetic resin film 3a of the waterproof layer and the steel plate 1 to form a three-piece unit.

As the mortar layer 4, ordinary grout mortar may be used. However, if non-shrink mortar is adopted, the bonding power of the above three members becomes strong as described above. That is, the grout mortar, which is the predecessor of the non-shrink mortar, expands and contracts in the process of solidifying in the gap S between the resin film 3a of the waterproof layer 3 and the steel sheet 1, thereby causing initial stress between the mortar and the steel sheet. It works to generate. Therefore, by attaching the repair wall to the existing wall W with the mounting bolts 2, the strength of the wall can be increased, and the wall can be made excellent in earthquake resistance.

Thus, a waterproof layer 3 is provided on the inner side of the inner wall surface W.
By integrally laminating the mortar layer 4 and the steel plate 1 and fixing the laminated body with the mounting bolts 2, it is possible to completely prevent water leakage from underground into the underground building. At the same time, the existing walls are reinforced in a strong manner, so that the earthquake resistance can be improved. The surface of the repair wall (steel plate) has corrosion resistance,
A spray coating film 5 for providing soundproofing and decorativeness is formed.

Next, an example in which the repair wall according to the present invention is applied to the inner wall surface of the basement will be described. First, as an advance preparation, cleaning of the inner wall surface W and repairing of cracks and cracks are performed. For repairing cracks and the like, the portions such as the cracks are washed as deeply as possible, and polygrout (trade name, manufactured by Konishi Co., Ltd.) is injected into the portion so as to prevent water leakage.

Next, a groove M having a predetermined width is dug in the floor where the existing inner wall surface W and the floor F intersect. The width of the groove M is
If a conventional gutter is provided, it is preferable to set the range including the portion, and the depth thereof is preferably set within the range of the thickness of the underfloor concrete (slab) constituting the floor surface F.

Next, the waterproof layer 3 is attached to the inner wall surface W of the existing wall including the depth of the groove M. As an example of the waterproof layer 3, a bentonite sheet is employed. As an example of the bentonite sheet, there is a para seal (trade name, manufactured by Toyojun Yoko Co., Ltd.) in which bentonite 3b is attached to one surface of a resin film 3a. When the waterproof layer 3 is attached to the wall surface W, the surface on which the bentonite 3b is adhered contacts the wall surface side, and when the resin film surface is pressed toward the wall surface, the bentonite is attached to the wall surface and the waterproof layer 3 is attached to the wall surface. Is formed.

Next, the steel sheet 1 cut into a predetermined size is positioned so that the lower side thereof is in contact with the bottom of the groove M and faces the waterproof layer 3 at a predetermined interval. And fix it in several places.

[0027] As shown in Figs.
For mounting, a mounting hole 6 having a diameter larger than the diameter of the bolt is drilled from above the waterproof layer 3, and
And the screw anchor 8 is inserted before the grout material is solidified. The screw anchor 8 is permanently fixed to the existing wall by solidifying the grout material 7. The steel plate 1 can be fixed to a wall surface by screwing the mounting bolt 2 into the female screw portion of the screw anchor 8. As an example of the mounting bolt 2, a hexagonal head bolt having a diameter of 20 mm and a length of 250 mm is employed.

Next, a grout mortar is injected from an opening located above the gap G between the steel plate 1 and the waterproof layer 3 and solidified to form a mortar layer 4. As an example of the grout mortar, there is Denkacostan (trade name, manufactured by Denki Kagaku Kogyo KK) which is commercially available as a non-shrink mortar.

After the construction of the repair wall at the portion in contact with the floor surface F is completed, a repair wall is formed on the portion above the repair wall by the same operation, and this operation is continued to cover the entire wall surface. The joints between the steel plates are joined by butt welding or an adhesive so that no gap is generated (see FIG. 3). Similarly, a repair wall is constructed on the beam and the ceiling C located above the wall.

When the work of attaching the repair wall to the existing wall is completed, the groove M dug in the floor F is back-filled with the waterproof mortar N. As a waterproof mortar, Kyutech (trade name, manufactured by Denki Kagaku Kogyo Co., Ltd.) is used and finished so as to be flush with the existing floor F.

Finally, a coating film 5 is formed on the surface of the steel sheet 1 and the surface of the backfill. The coating film 5 performs the functions of decoration, corrosion protection, and soundproofing. An example of a paint for forming the coating film is a rim spray (trade name, manufactured by Mitsui Toatsu Chemicals, Inc.).

The repair wall thus completed is the same as the existing wall W
In addition to preventing water leakage from the wall surface of the underground building and reinforcing the wall surface, not only the seismic resistance can be improved but also the effective area of the basement can be increased and the running cost can be reduced.

[0033]

According to the present invention, it is possible to prevent the leakage of groundwater on the inner wall surface of an existing underground building such as a basement, and to reinforce the existing wall to improve the earthquake resistance. Further, since it is possible to completely prevent water leakage, a gutter or a decorative wall is not required, and an effective area of a basement or the like can be increased. In addition, this can reduce the running cost of existing underground structures by eliminating the need for drainage costs.

According to the present invention, since the existing wall is reinforced in a strong manner as described above, the life of the whole building can be extended since the earthquake resistance is improved. Further, since the reinforcing plate covers the front surface of the existing internal wall surface, it is possible to prevent the concrete block such as the deteriorated wall surface from falling or falling, and to improve the safety under normal use conditions.

[Brief description of the drawings]

FIG. 1 is a sectional view of a repair wall structure.

FIG. 2 is an enlarged sectional view of a main part of the same.

FIG. 3 is a perspective view of a partially cut-away section showing a construction state.

FIG. 4 is a cross-sectional view showing a configuration of a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reinforcement board (steel plate) 2 Mounting bolt 3 Waterproof layer (bentonite sheet) 3a Resin film 3b Bentonite 4 Mortar layer W Existing wall (internal wall)

Claims (5)

[Claims] 1. A waterproof layer formed on an inner wall surface of an existing underground building, a reinforcing plate provided to face the wall surface at a predetermined distance from the waterproof layer, and the reinforcing member An existing underground building, comprising: a plurality of mounting bolts for fixing a plate to the wall surface; and a mortar layer filled in a space defined between the waterproof layer and the reinforcing plate. Repair wall structure for objects. 2. The repair wall structure according to claim 1, wherein the reinforcing plate is a steel plate. 3. The repair wall structure for an existing underground building according to claim 1, wherein the waterproof layer is a bentonite sheet formed by applying bentonite to a synthetic resin film. 4. The repair wall structure for an existing underground building according to claim 1, wherein the mortar layer is made of non-shrink mortar. 5. A waterproof layer is formed on an inner wall surface of an existing underground building, a reinforcing plate is positioned so as to face the waterproof layer at a predetermined interval, and the reinforcing plate is attached to the wall surface. Fixing via bolts, filling the space defined between the waterproof layer and the reinforcing plate with grout mortar, solidifying the grout mortar to form a mortar layer, and forming the waterproof layer on the inner wall surface A method of constructing a repair wall in an existing underground building, wherein the repair wall is constructed by integrally combining the mortar layer and the reinforcing plate.