JP2808352B2 - Method and equipment for preventing building from rising - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention aims to prevent floating of a building constructed on a ground with a high groundwater level, and in particular, to stabilize a building that may float during a flood or the like. The present invention relates to a method and an apparatus for preventing a building from floating.

Conventional technology When floods occur on the ground, the groundwater level in the ground where the groundwater level is high originally rises more and more, and there is a concern that the building will rise due to the effect of buoyancy due to the elevated groundwater level and the elevated groundwater pressure, which is a serious problem. Is in question.

Conventionally, as a construction method and a preventive device for preventing the floating of a building, as shown in FIG. 3, additional concrete c or the like is applied to the lower part of a pit b at the deepest portion of a building a to increase the building's own weight. In general, the resistance to the floating of the building a is increased.

Alternatively, as shown in FIG.
A permanent anchor e or a friction pile (not shown) is driven into the inside to fix the building a on the ground d to prevent the building a from rising.

Further, as shown in FIG. 5, a deep well f is provided in the ground d below the building to pump up groundwater to lower the groundwater pressure and prevent the building a from floating.

Problems to be Solved by the Present Invention As shown in FIG. 3, in the case of the additional concrete c, as the depth of the ground is deepened, the required amount of concrete or the like to be cast increases. In addition, the work process of concrete additional beating c is troublesome, and costs are extremely large.
The problem has arisen. In addition, there is an inconvenience that the concrete overfilling c limits the degree of freedom of livelihood at the deepest part of the building.

Such a problem similarly occurs when the permanent anchor e shown in FIG. 5 is used. Especially permanent anchor e
Is inconvenient because it must be performed prior to the construction of the underground structure of the building, and the cost of the permanent anchor e reduces the construction cost.

Further, when groundwater is pumped by a deep well f as shown in FIG. 6, the running cost associated with drainage of the pumped groundwater becomes extremely high. Moreover, with the pumping, the water stop wall g
There is a problem that there is a high possibility that the surrounding ground d 'outside the outside will sink.

Accordingly, an object of the present invention is to reduce the groundwater pressure immediately below the building by pumping the groundwater that has risen significantly during a flood or the like and forcing it into the ground outside the water blocking wall (condensing). It is an object of the present invention to provide a method and an apparatus for preventing a building from rising, which prevent the water from rising and secure the groundwater level outside the water stop wall to prevent the surrounding ground from subsidence.

Means for Solving the Problems First to Fourth Inventions As means for solving the above-mentioned problems of the prior art, a method for preventing the floating of a building according to the present invention is suitable for FIGS. 1 and 2 of the drawings. As shown in the example, a pumping tank 2 and a pump room 3 were provided at the deepest part of a building 1, and a pumping well 5 communicating with a pump unit 4 installed in the pump room 3 was installed in the ground 6 immediately below the building. Further, the water injection well 7 communicating with the pump unit 4 is installed in the external ground 9 by penetrating the water blocking wall 8 in the horizontal direction, and is installed in the external ground 9.
Pumping the groundwater with the pump unit 4, and injecting the groundwater into the outer ground 9 of the water stop wall 8 through the water injection well 7 to return the groundwater.

In addition, the device for preventing rising of a building according to the present invention includes a building 1
Pumping tank 2 and pump chamber 3 provided at the deepest part of
A pump unit 4 installed in the pump room 3; a pumping well 5 communicating with the pump unit 4 and installed in the ground 6 immediately below the building; and a water blocking wall 8 communicating with the pump unit 4 and extending horizontally. And a water injection well 7 installed in the external ground 9 by penetrating therethrough.

In the present invention, the pump unit 4 is provided with a pump 11 for pumping provided on the suction side with an automatic valve 10 for switching the pumping pipe 5a of the pumping well 5 and the drainage pipe 2a of the pumping tank 2, and on the discharge side of the pumping pump 11. A filtration unit 12 provided, a water supply pump 13 having a suction side connected to the filtration unit 12, and a water supply pipe of a water supply well 7 connected to an outlet side of the water supply pump 13 via an automatic switching valve 14. 7a, the suction side is connected to the automatic switching valve 14, the discharge side comprises a backwashing pump 15 connected to the pumping tank 2 via the filtration unit 12, and an automatic control device 16, and When the water pressure gauge, which measures the water pressure under the pressure-resistant panel of the building 1 as a sensor, detects a groundwater pressure equal to or higher than a predetermined value, the pump unit 4 automatically pumps the groundwater and the external ground 9 of the water stop wall 8. Forced water injection into the When the flowmeter as a sensor detects a drop in pumping efficiency (or water injection efficiency), it automatically performs backwashing and water injection into the pumping tank.

Operation When the pump unit 4 is operated and groundwater is pumped from the ground 6 directly below the building through the pumping well 5, the groundwater level and the groundwater pressure in the ground 6 decrease, and the operation force for floating the building 1 is reduced.

Further, the pumped ground water is forcibly injected into the outer ground 9 outside the water blocking wall 8 by the same pump unit 4 and returned to the ground by the same operation of the pump unit 4.
The groundwater level inside is secured, and uneven settlement of the surrounding ground due to the movement of groundwater is prevented.

Embodiment Next, the illustrated embodiment of the present invention will be described.

FIG. 1 shows an embodiment of a device for preventing a building from rising according to the present invention, and FIG. 2 shows details of a structure of a main part.

In FIG. 1, the building 1 surrounded by the water blocking wall 8 (however,
The building is not limited to the illustrated underground type structure), and a pumping tank 2 and pump rooms 3 are provided at the deepest part. A pump unit 4 shown in detail in FIG. 2 is installed in the pump chamber 3. The pumping well 5 communicating with the pump unit 4 is installed substantially vertically in the ground 6 immediately below the building. The water injection well 7, which is also connected to the pump unit 4, is penetrated horizontally through the water blocking wall 8, and is installed sufficiently deep in the external ground 9.
The water injection well 7 is installed by coring the water stop wall 8.

In short, the groundwater pumped through the pumping well 5 by the pump unit 4 is forcibly injected (condensed) into the external ground 9 outside the water stop wall 8 through the water injection well 7 as it is.
This lowers the groundwater pressure in the ground 6 immediately below the building (under the pressure-resistant board), thereby preventing the building 1 from rising. At the same time, water barrier 8
The groundwater level in the external ground 9 is secured sufficiently high, so that adverse effects such as uneven settlement of the surrounding ground due to the movement of the groundwater are prevented.

The pump well 5 will be described in more detail with reference to FIG.
Is a configuration in which a pumping pipe 5a is installed sufficiently deep in a pumping strainer 5b formed by a casing pipe. Pumping pipe
5a is connected to the automatic switching valve 10 in the pump chamber 3 after the cored portion of the pressure-resistant panel 1a of the building 1 is water-sealed with packing 18. The automatic switching valve 10 includes a drain pipe 2a from the pumping tank 2.
Is also connected. This automatic switching valve 10 is provided with a pump 11
Is connected to the suction side.

The discharge side of the water pump 11 is connected to the filtration unit 12,
The suction side of a water injection pump 13 is connected to the filtration unit 12. The discharge side of the water injection pump 13 is connected to a water injection pipe 7a of the water injection well 7 via an automatic switching valve 14. The water injection well 7 has a configuration in which a side wall and a water stop wall 8 of the building 1 are cored, and a water injection strainer 7b formed by a casing pipe is installed horizontally and horizontally, and the water injection pipe 7a is inserted sufficiently deep therein. ing.

The automatic switching valve 14 is connected to a suction side of a backwashing pump 15, and a discharge side of the pump 15 is connected to the pumping tank 2. In FIG. 2, reference numeral 16 denotes a control device for the pump unit 4.

In short, when the groundwater level rises due to the above-mentioned flood, etc., a water pressure gauge (not shown) installed below the pressure plate 19 of the building 1 measures an abnormal rise in the groundwater pressure, and measures this by a control device. Enter 16 When the underground water pressure reaches a certain value (a pressure that impairs the stability of the building) according to the input signal, the control device 16 automatically starts the pump 11 and pumps the groundwater through the pumping well 5 to reduce the groundwater pressure. To prevent the building 1 from rising.

The groundwater thus pumped up by the pump 11 is first sent to the filtration unit 12 for filtration.
Then, it is sent to the water injection well 7 and is forcibly injected (condensed) into the external ground 9 outside the water stop wall 8.

Thus, the forced injection by the injection well 7 continues for a long time,
If the water injection efficiency (or pumping efficiency) decreases due to clogging of the water injection strainer 7b, for example, the water injection pump 13
A flow meter (not shown) installed in the discharge pipe measures a change in the flow rate in the pipe. Then, when the flow rate becomes equal to or less than a certain value and the information is input to the control device 16 by the flow meter, the control device 16a first stops the pumping pump 11. Then, the automatic switching valve 14 is switched in the direction of the pumping tank 2, the backwashing pump 15 is started, and the injection well 7
The groundwater is collected from the outside ground 9 through the water injection strainer 7b and sent to the pumping pit 2. At this time, if the underground water pressure under the pressure plate is high, the operation of the pumping pump 11 is also used to pump up the groundwater and increase the injection of water into the pumping tank 2 through the path of the backwashing pump 15, and To increase the water weight of the building 1 to resist the rising of the building 1.

Thus, when the underground water pressure falls below a certain value or when there is no need for backwashing, the automatic switching valve 10 is switched to the direction of the drain pipe 2a of the pumping tank 2, and the water in the pumping tank 2 is pumped out by the pumping pump 11. After the water is filtered by the filtration unit 12, water is injected into the external ground 9 outside the water blocking wall 8 through the injection well 7 by the injection pump 13, and the pumping tank 2 is emptied.

Advantageous Effects of the Present Invention According to the method and apparatus for preventing a building from rising according to the present invention, as an automated mechanized system, the pressure of the groundwater under the pressure-resistant panel of the building 1 is reduced, and thus the building 1 having high effectiveness and reliability is provided. It has the effect of preventing the floating of the building and contributes to maintaining the stability of the building.

At the same time, the groundwater level of the external ground 9 is secured by forced water injection (condensation) into the external ground 9 of the water stop wall 8,
Adverse effects such as uneven settlement of the surrounding ground can be prevented beforehand.

Therefore, the present invention is effective when used together as an auxiliary method of the conventional concrete add-in method (FIG. 3) under the condition that the groundwater level is extremely high. This is because, under the condition that the groundwater pressure is extremely high, the floating prevention device of the present invention is inexpensive as compared with heavy concrete in which additional concrete is used with heavy concrete. In addition, the conventional concrete refilling method (No. 3
Since there is no need to reduce the space used in the basement of the building as shown in Fig.), The degree of freedom in designing the basement space is improved.

The construction method and apparatus of the present invention can shorten the construction period as compared with the conventional permanent anchor construction method (FIG. 4).

Further, compared with the conventional pumping method (FIG. 5), no drainage fee is required, so that running costs are low and economical. In particular, it is more effective because it is difficult to discharge the pumped groundwater to public sewerage facilities, especially in the event of a flood. Of course, it is an advantage that the settlement of the surrounding ground can be prevented.

Compared with the conventional anchoring method (FIG. 4), the floating prevention device of the present invention can be freely arranged, and the effects such as the freedom of design can be secured.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a method and an apparatus for preventing a building from rising according to the present invention, FIG. 2 is an enlarged detailed view showing a main part structure of a pump unit, and FIGS. It is sectional drawing which showed the Example of the conventional method. 1 ... building 2 ... pumping tank 3 ... pump room 4 ... pump unit 5 ... pumping well 8 ... water blocking wall 7 ... water injection well 5a ... pumping pipe 2a ... drainage pipe , 10 ... Automatic valve 11 ... Pumping pump, 12 ... Filtration unit 13 ... Irrigation pump, 14 ... Automatic switching valve 7a ... Irrigation pipe, 15 ... Backwash pump

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Toshiaki Ishise 2-5-14-1 Minamisuna, Koto-ku, Tokyo Inside the Technical Research Institute, Takenaka Corporation (72) Inventor Shinichi Sanada 8-2-1-1, Ginza, Chuo-ku, Tokyo No. Takenaka Civil Engineering Co., Ltd. (58) Fields surveyed (Int. Cl. ⁶ , DB name) E02D 31/12 E02D 31/02 E02D 29/00

Claims (4)

(57) [Claims] 1. A pumping tank and a pump room are provided at the deepest part of a building, a pumping well communicating with a pump unit installed in the pump room is installed in the ground immediately below the building, and a pumping well communicating with the pump unit is provided. It is installed in the external ground by penetrating the water blocking wall in the horizontal direction, pumping groundwater with a pump unit through a pumping well, and injecting the groundwater into the external ground of the water stopping wall through a water injection well and returning the water. Prevention of building lift. 2. A pumping tank and a pump room provided at a deepest part of a building, a pump unit installed in the pump room, a pumping well connected to the pump unit and installed in the ground immediately below the building, A floating prevention device for a building, comprising a water injection well which is also communicated with the pump unit and penetrates a water blocking wall in a horizontal direction and is installed in an external ground. 3. A pump unit having an automatic valve on the suction side for switching between a pumping pipe of a pumping well and a drainage pipe of a pumping tank; a filtration unit provided on a discharge side of the pumping pump; A water injection pump connected to the filtration unit, a water injection pipe of a water injection well connected to the discharge side of the water injection pump via an automatic switching valve, and a discharge side connected to the automatic switching valve on a suction side. 3. The apparatus according to claim 2, further comprising a back-washing pump connected to the pumping tank via the filtration unit, and an automatic control device. 4. A pump unit, as a sensor, automatically performs pumping of groundwater and injecting water outside a water stop wall when a water pressure gauge which measures a water pressure under a pressure plate of a building detects a water pressure of a predetermined value or more. 4. The floating prevention of a building according to claim 2 or 3, wherein when a flow meter as a sensor detects a decrease in pumping efficiency, backwashing and water injection into a pumping tank are automatically performed. apparatus.