JP3229255B2 - How to expose the waterproof layer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for exposing a part of a waterproof layer covered with a press concrete in an existing or existing building for repairing the waterproof layer.

[0002]

2. Description of the Related Art On the roof of an existing building, the floor of a kitchen, the floor of a food factory, etc., a slab is covered with a waterproof layer such as an asphalt waterproof layer, and the waterproof layer is further covered with a presser concrete for protecting the slab. ing.

[0003] The waterproof layer may be cracked due to its deterioration over time and its expansion and contraction due to changes in temperature, etc., which may cause rain or water leakage. Must be removed to expose the cracked portion (repaired portion) of the waterproof layer.

[0004]

Conventionally, a part of the presser concrete for repairing the waterproof layer is removed by crushing a part of the presser concrete using a crushing device such as a rock drill. I was However, this operation involves generation of loud noise and vibration. For this reason, residents and users of the operating building are physically and mentally distressed, particularly in buildings such as hotels and hospitals. This time-limited the repair work on the waterproof layer or made it virtually impossible to do so.

[0005] It is an object of the present invention to provide a method for removing a part of the holding concrete, thereby exposing the waterproof layer, with low noise, preferably low vibration.

[0006]

A part of the waterproof layer in the existing building is exposed by providing at least two holes opened in the surface of the holding concrete for protecting the waterproof layer.
Then, filled with swelling agent at least one of the holes, causing fracture of the pressing concrete by volume expansion of the swelling agent performed by removing the fragments, said hole
When forming the waterproof layer, the waterproof layer is not damaged, and
Of the waterproof layer due to the crushing action of concrete
Has a depth to avoid damage.

[0007]

According to the operation and effect of the present invention, the formation of at least two holes into the pressing concrete, by the filling of the expanding agent to at least one of the holes, do some crushing of the pressing concrete. Each hole defines a free surface of the concrete section between the holes and also constitutes a structural weakness of the holding concrete. Therefore, when the inflation pressure by temporal volume expansion of the expanding agent in said hole extends in a direction perpendicular to the peripheral wall surface of the hole, a crack occurs in the concrete portion between the hole mutually said concrete portion Is crushed. This fracturing phenomenon proceeds quietly and slowly and with almost no vibration. From this, it is possible to partially crush the holding concrete for partially exposing the waterproof layer with almost no noise and vibration. Therefore, according to the present invention, it is possible to repair a waterproof layer in a hospital, a hotel, a library, or the like, for example, where tranquility is particularly required, without being restricted by time and regardless of the type of building. In addition,
Before the formation of holes and crushing of the holding concrete
Repair work on the waterproof layer without causing damage to the waterproof layer
It can be performed. Further, when the hole is formed by ultrasonic cutting, since the hole can be formed under low noise and low vibration, the repair work of the waterproof layer is performed more quietly. Can be.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, there is shown a waterproof structure on the roof of an existing or existing concrete building 10 to which the present invention is applied. The present invention provides, in addition to a waterproof structure on a roof, for example, a kitchen floor in an existing building (however, whether it is made of concrete or not),
The present invention can be applied to a waterproof structure that is substantially the same as the waterproof structure on the roof, such as a floor of a food factory.

The waterproof structure includes a concrete slab 12 and a waterproof layer 14 covering the surface (upper surface) of the slab 12.
(For example, asphalt, several layers of asphalt felt, asphalt roofing, special asphalt roofing, etc.), and presser concrete 16 struck on the waterproof layer to protect the waterproof layer 14.

[0010] The waterproof layer 14 may be torn due to its deterioration over time, its expansion and contraction due to a change in air temperature, and the like, which may cause leakage. For this reason, repair for closing the crack 18 generated in the waterproof layer 14 is performed.

The repair of the waterproof layer 14 is performed by first removing a part of the pressing concrete 16 above the place where the crack is generated, that is, the repair part. Partial removal of the holding concrete 16 is performed according to the present invention.

[0012] As shown in FIG.
In order to remove a part of the concrete, a plurality of holes (round holes in the illustrated example) 20 are provided on the surface of the press concrete 16. Hole 20 so as not to damage the waterproof layer 14 when forming the hole, also in order to avoid damage to the waterproof layer due to crushing action of the presser concrete 16 to be described later extends to the waterproof layer 14, pressing the concrete also 16 do not penetrate the
And Preferably, the depth of the hole 20 is approximately 2/3 of the thickness of the holding concrete 16.

[0013] For providing such a hole 20, prior to the formation of the holes, in advance measures the thickness of the covering concrete 16 using, for example, ultrasonic thickness meter.

The hole 20 can be formed by subjecting the holding concrete 16 to ultrasonic cutting. That is, a spindle having a tip provided with a grindstone is
To rotate the cutting force of the whetstone on the concrete 16 while rotating the spindle.
By ultrasonic vibration .

The direction in which the ultrasonic vibration is applied is the spin
The direction of the dollar . The frequency and amplitude of the ultrasonic wave at this time are set to, for example, 20 kHz and 55 μm, respectively. By applying the ultrasonic vibration, the cutting resistance of the whetstone is significantly reduced. For this reason, the noise level and vibration generated at the time of forming the hole can be significantly reduced, more specifically, the noise or cutting sound can be inaudible and almost non-vibration at a distance of several meters.

As a specific device for forming the hole 20, for example, a "hand-held rotary tool" described in Japanese Utility Model Registration No. 3019063 can be used. In this tool, a horn is attached to a tip of an ultrasonic vibrator rotatably supported in an outer case, and a grindstone is attached to a tip of the horn. When the ultrasonic vibrator is driven to rotate around its axis, the horn and the grindstone rotate around these axes. Further, by operating the ultrasonic vibrator, ultrasonic vibration can be generated in the axial direction of the horn. By pressing the grindstone against the surface of the concrete 16 to rotate the grindstone and applying ultrasonic vibration to the grindstone, the hole can be formed with almost no noise and vibration.

[0017] For the hole 20, the range or distance limits the inflation pressure range effective for later expansion agent 22, namely, in consideration of the range or distance limits below crack 24 may occur, these holes 20 form, Direction, mutual spacing, size,
Depth and the like can be determined.

Therefore, the arrangement of the plurality of holes 20 may be regular or irregular. Also different
Holes having different shapes or holes having different diameters may be mixed. Further, each of the holes does not matter in the extending direction with respect to the depth direction. That is, these depth directions may be either vertical or non-vertical.

Next, each of the formed holes 20 is filled with an expanding agent 22. The swelling agent is preferably made by kneading a drug mainly composed of an inorganic compound mainly composed of quick lime and silicate (for example, "Blystar" manufactured by Onoda Co., Ltd.) with water and kneading the mixture. Reacts with water (hydration reaction) so that its volume expands with time.

Other examples of the expanding agent include calcined dolomite, magnesia, ordinary Portland cement-blast furnace slag-bauxite-gypsum, alumina cement-lime-gypsum, and the like.

Due to the volume expansion of the expanding agent 22 in each hole 20, the peripheral wall surface of the hole 20 is moved in the radial direction (pressing concrete 16).
In the in-plane direction). Said "Bryster"
Has about three times the volume expansion capacity. Due to the volume change of the expanding agent, the pressing concrete 16 receives a compressive force in its plane.

At this time, the pressing concrete 16 has a wall (not shown) which defines the periphery of the roof at its periphery.
(In the case of the floor of the kitchen, the floor of a food factory, etc., these are the surrounding walls, beams, etc.), so that the concrete portion between the periphery of the holding concrete 16 and the hole 20 is as described above. Withstand compressive force. In contrast, the concrete portions between the holes 20 mutually, because those leading to the hole 20 which forms a weak point in the structure of the presser concrete 16, when receiving the compressive force, it is impossible to counteract the compressive forces, Many cracks 24, i.e., fractures, occur in this concrete part.

The portion between the holes 20 where the cracks 24 are formed consists of a large number of fragments, and these fragments can be easily removed. In the illustrated example, the hole 20 does not penetrate the holding concrete 16 and does not reach the waterproof layer 14. From this, the inflation pressure of the expansive agent 22 is only slightly applied to the concrete portion 26 between the bottom of the hole 20 and the waterproof layer 14, and a small number of cracks occur in the concrete portion 26. Accordingly, the concrete portion 26 is cracked and removed by applying a small impact to the surface with, for example, a hammer. The noise and vibration generated at this time are relatively small. By removing the concrete portion 26, the location where the crack 18 of the waterproof layer 14 occurs can be exposed.

Partial crushing of the holding concrete 16 is caused by static expansion of the expanding agent 22 over time, and thus hardly causes noise and vibration. From this, the process from the formation of the hole 20 to the removal of the concrete portion 26 can be performed while maintaining an extremely quiet environment. Therefore, the repair of the waterproof layer 14 and the crushing of the holding concrete 16 for the repair in the building 10 including facilities such as office buildings, apartment buildings, hospitals, hotels, public libraries, etc., which are particularly required to be quiet, are bound by time. And without fail.

The required number of holes 20 is determined by the number of cracks 2
4, at least two of which are needed to reveal the inter- hole portion to produce 4. In addition, the swelling agent 22 is
Instead of the illustrated example of filling the holes 20, two
One of the two holes 20 may be filled. Quantity of the holes 20, the holes 20 or the like to be filled with swelling agent 22, pressing the concrete 1
Determined in consideration of the area of the crushed part, the size of the hole , etc.

[0026] After exposure of the waterproof layer 14, for example, filling the at waterproof layer the same structure sheet material 28 covers the crack 18 or a crack 18 with a filler having a waterproof (Figure 4).

After that, concrete 30 is put into a hole formed by partially crushing the holding concrete 16, the waterproof layer 14 is covered with the concrete, and the repair is completed.

[Brief description of the drawings]

FIG. 1 is a partial vertical sectional view of a rooftop waterproof structure in a concrete building.

[2] a hole provided in the presser concrete shows a state filled with swelling agent into the hole, is a partial longitudinal sectional view of the waterproof structure.

FIG. 3 is a partial longitudinal sectional view of the waterproof structure after a part of the holding concrete is removed.

FIG. 4 is a partial longitudinal sectional view of the waterproof structure, showing a repair state of the waterproof layer.

FIG. 5 is a partial vertical cross-sectional view of the waterproof structure, showing a state in which concrete has been poured into a hole formed in the holding concrete after repair.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Concrete building 12 Slab 14 Waterproof layer 16 Holding concrete 18 Waterproof layer crack 20 Hole 22 Expanding agent

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-186673 (JP, A) JP-A-63-159961 (JP, U) JP-A-1-118771 (JP, U) (58) Investigation Field (Int.Cl. ⁷ , DB name) E04G 23/08

Claims (1)

(57) [Claims] 1. A method of exposing a part of a waterproofing layer for repairing a waterproof layer under a pressurized concrete protected by a pressurized concrete in an existing building, wherein the pressurized concrete is subjected to ultrasonic cutting. Forming at least two holes that are open to the surface by applying, filling at least one hole with an expansive agent, and causing crushing of the holding concrete by volume expansion of the expansive agent;
Including removing crushed pieces of the holding concrete,
The hole does not damage the waterproof layer during its formation, and
A method of exposing a waterproof layer, the method having a depth that avoids damage to the waterproof layer due to the crushing action of the holding concrete.