JP4092644B2 - Method and apparatus for injecting injection solution into existing structure foundation ground - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and an apparatus for injecting an injection solution into a foundation ground of an existing structure, in which an injection solution suitable for ground improvement is injected into the foundation ground under the existing structure.
[0002]
[Prior art]
Conventionally, an important structure located on soft ground has been required to take measures against ground liquefaction in the event of an earthquake, and there is a chemical solution injection method as an effective countermeasure method. In the chemical solution injection method, since the chemical solution is pressurized and injected into the ground, the ground in the vicinity of the injection hole and the adjacent structure are often deformed. For this reason, as shown in Patent Document 1, there has been devised an injection method capable of creating an improved injection body having a large diameter under a very low pressure over a long period of time.
[0003]
[Patent Document 1]
JP 2002-317436 A
[0004]
[Problems to be solved by the invention]
However, even in such a configuration, as shown in FIG. 8, the chemical solution 19 is injected into the foundation ground 18 under the existing structure 17 surrounded by the impermeable barrier such as the water blocking wall 16 or the viscous soil layer. In this case, since there is no escape space for the groundwater 20 to meet the injection amount, the water pressure of the foundation ground 18 to be injected tends to rise, and the foundation floor slab 21 of the existing structure 17 and the wall 22 attached thereto are inclined. In many cases, the function as a structure or mechanical equipment is defective, such as a displacement such as bending or bending, or a crack or water leakage. For this reason, there is a need for an injection solution injection method suitable for ground improvement with respect to the foundation ground 18 under the existing structure 17 so as not to cause problems in the existing structure 17.
[0005]
In view of the above circumstances, the present invention does not cause harmful deformation to an existing structure, and injects an injection solution suitable for ground improvement into the foundation ground under the existing structure. An object of the present invention is to provide a liquid injection method and apparatus.
[0006]
[Means for Solving the Problems]
The method for injecting an injection solution into the foundation ground of an existing structure according to claim 1 is a method for injecting an injection solution into the foundation ground of an existing structure in which an injection solution suitable for ground improvement is injected into the foundation ground under the existing structure. A first step of installing a plurality of vertical holes penetrating the foundation floor slab of the existing structure and reaching a predetermined depth of the foundation ground, and injecting the injection liquid into any one of the vertical holes The second step of positioning a hole and a plurality of vertical holes adjacent to it as a pumping hole, and the deformation state of the foundation floor slab and the foundation ground around the injection hole are monitored so that the deformation amount falls within a predetermined limit. While injecting the injection pressure from the injection hole to the foundation ground while controlling the injection pressure, the groundwater is pumped from the pumping hole in parallel with this, Monitoring the fluctuation of the groundwater head, when the groundwater head rises above the predetermined range, And a third step of controlling the groundwater head to be within a predetermined range, and the second step and the third step are repeated for all the vertical holes.
[0007]
An injection device for injecting liquid into an existing structure foundation ground according to claim 2 is an apparatus for injecting injection liquid into an existing structure foundation ground, which injects an injection solution suitable for ground improvement into the foundation ground under the existing structure. An injection means for pressurizing and injecting the injection solution into the foundation ground, a deformation detection means for detecting a deformation situation related to the foundation ground and a foundation floor slab of an existing structure, and the foundation ground In While controlling the groundwater head to be within the specified range In conjunction with the pumping means for pumping up the ground water, the deformation detecting means and the injecting means, the deformation detecting means is notified of the amount of deformation of the foundation ground and the foundation floor slab, and injection into the foundation ground according to the state of deformation. It is provided with a measurement calculation means for calculating the optimum injection pressure amount of the liquid and notifying the injection means of the injection pressure amount, and the deformation detection means is provided with a floor slab change for detecting deformation and damage of the foundation floor slab. The present invention is characterized by comprising a ground detection means, and a foundation ground deformation detection means for detecting a moisture content change of the foundation ground and water leakage on the surface.
[0008]
The injection device for injecting liquid into the foundation ground of the existing structure according to claim 3 is characterized in that the injection means is provided with an injection pressure control mechanism for automatically controlling the amount of injection pressure of the injection liquid into the foundation ground. .
[0009]
The apparatus for injecting the liquid into the foundation ground of the existing structure according to claim 4 grasps the moisture content change and the surface water leakage to the foundation ground deformation detection means of the deformation detection means without contacting the foundation ground. A non-contact distance measuring type sensor is provided.
[0010]
The injection apparatus for injecting liquid into the foundation ground of an existing structure according to claim 5 is characterized in that the pumping means includes a compressor that generates compressed air, and a pumping hole in which the compressed air generated by the compressor is installed in the foundation ground. And a pumping pipe whose one end is inserted into the pumping hole, and by utilizing the pressing force of the compressed air sent through the pumping pipe, groundwater in the foundation ground is removed. It is characterized by pumping water through a pumping pipe.
[0011]
The apparatus for injecting an injection solution into the foundation ground of an existing structure according to claim 6 includes a liquid level sensor for detecting a groundwater head in the foundation ground, and a groundwater interlocking with the liquid level sensor and the compressor. A head control mechanism is provided, and the groundwater head control device controls the pumping amount of the groundwater according to the water head level notified from the liquid level sensor.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The method and apparatus for injecting the injection solution into the foundation ground of the existing structure according to the present invention monitors the deformation of the foundation ground and the foundation floor slab of the existing structure when injecting the injection solution suitable for ground improvement into the foundation ground. In addition, the injection pressure is adjusted as appropriate, and in parallel with this, pumping is performed so that the groundwater head of the foundation ground is within the specified range, so that no harmful deformation is caused to the existing structure. The ground will be improved.
[0013]
As shown in FIG. 1, an injection device 1 for injecting liquid into a foundation ground of an existing structure includes an injection means 2, a deformation detection means 3, a pumping means 6, and a measurement calculation means 7. The injection means 2 pressurizes and injects an injection solution 15 such as a chemical solution suitable for ground improvement into the foundation ground 13, and in this embodiment, an injection pressure control capable of controlling the injection pressure. It has the structure provided with the mechanism 2c.
In general, injecting the injection solution 15 into the ground at a constant speed, the relationship between the injection speed and the injection pressure is non-linear as shown in the graph of FIG. Therefore, even if the injection rate is decreased, the injection pressure does not always decrease. Therefore, the method of adjusting the injection pressure amount of the injection solution 15 to the ground through the change of the injection rate is complicated. is there. Hereinafter, the injection means 2 including the injection pressure control mechanism 2c capable of simply adjusting the injection pressure amount will be described.
[0014]
As shown in FIG. 1, the injection means 2 includes a pressurizing tank 2a stored in a pressurized state of the infusate 15, a compressor 2b for pressurizing the inside of the pressurizing tank 2a, and an internal pressure of the pressurizing tank 2a. The injection pressure control mechanism 2c for controlling the injection pressure amount of the injection solution 15, the supply device 2d for supplying the injection solution 15 to the pressurizing tank 2a, and the injection solution 15 are injected into the foundation ground 13. An injection hose 2h is provided. The replenishing device 2d is provided with a replenishing controller 2f, a liquid amount detector 2g, and a liquid storage tank 2e for storing a replenishing injection solution 15.
The injection pressure control mechanism 2c attached to the pressure tank 2a replenishes the injection liquid 15 by controlling the replenishing device 2d so as to maintain the liquid level in the pressure tank 2a at a desired pressure, The pressure drop in the pressurizing tank 2a is detected, and the pressure drop in the pressurizing tank 2a accompanying the replenishment of the injection liquid 15 is detected, and the compressor 2b is controlled to control the pressure in the pressurizing tank 2a. Is controlled so as to always be kept constant.
[0015]
That is, the injection means 2 keeps the pressure of the pressurizing tank 2a constant by the injection pressure control mechanism 2c as described above, while supplying the injection solution 15 in the pressurizing tank 2a to the foundation ground 13 via the injection hose 2h. By continuously injecting under pressure, the injection solution 15 having a constant flow rate is injected at a constant rate. Moreover, the injection pressure amount to the foundation ground 13 is determined by the pressure in the pressurizing tank 2a controlled by the injection pressure control mechanism 2c. Therefore, the injection pressure amount can be easily adjusted by the injection pressure control mechanism 2c capable of maintaining the liquid level in the pressurizing tank 2a at a desired pressure, and by maintaining the pressure in the pressurizing tank 2a, The injection solution 15 can be stably and continuously injected into the foundation ground 13 while maintaining a desired injection pressure amount.
The injection means 2 is not necessarily limited to the above-described configuration, and it is possible to continuously pressurize and inject the injection solution 15 at a constant flow rate to the foundation ground 13 at a constant speed. Any one can be used as long as p can be adjusted.
[0016]
The deformation detection means 3 is assumed to occur in the foundation floor slab 9 and the foundation ground 13 of the existing structure 8 when the injection solution 15 is injected into the foundation ground 13 using the injection means 2. It detects the deformation, the floor slab deformation detecting means 4 for detecting the deformation and damage of the foundation floor slab 9 in the existing structure 8, and the water content change and surface of the foundation ground 13 under the existing structure 8 The foundation ground deformation detecting means 5 for detecting water leakage is provided.
[0017]
As shown in FIG. 3, the floor slab deformation detecting means 4 has an inclinometer 4a, a strain sensor 4b for detecting inclination and deflection with respect to the horizontal axis, and an out-of-plane direction such as uplift and subsidence. A displacement sensor 4c for detecting displacement, an image sensor 4d for detecting cracks and the like generated on the surface, a distance sensor 4e for detecting the length and width of the generated cracks, and the like are provided.
[0018]
On the other hand, as shown in FIG. 4, the foundation ground deformation detecting means 5 includes a moisture sensor 5a, a pF sensor 5b, a capacitance / electric resistance sensor 5c, and a thermal image sensor for detecting moisture content with respect to the foundation ground 13. 5d. In the present embodiment, the moisture sensor 5a employs an electromagnetic wave absorption type such as infrared absorption or microwave absorption that detects the amount of water in the foundation ground 13 from the attenuation state of electromagnetic waves. Further, the pF sensor 5b detects pF which is generally used as an index representing the state of soil water, that is, water that can be taken out when a certain pressure is applied to the soil, and is shown in FIG. Such a change in the amount of moisture is grasped based on the moisture characteristic curve of the foundation ground 18.
[0019]
The moisture sensor 5a and the pF sensor 5b are contact-type sensors arranged so as to be exposed in the foundation ground 13, but the capacitance / electrical resistance sensor 5c and the thermal image sensor 5d are the same as those of the foundation ground 13. It is a non-contact distance measuring sensor that operates even when the surface is coated. The capacitance / electrical resistance sensor 5c grasps a change in water content using an electrostatic capacitance or electric resistance that changes sharply according to the amount of moisture as an index. The thermal image sensor 5d The moisture content is measured as a temperature distribution change, and the moisture content change in a wide range can be estimated at a time.
[0020]
As described above, the basic ground deformation detecting means 5 for detecting the moisture content change of the basic ground 13 and the surface water leakage includes not only the contact type but also the non-contact type remote measuring sensor. The purpose is to accurately grasp the deformation of the foundation ground 13 not only in the foundation floor slab 9 but also in a state where the surface of the foundation ground 13 is covered with other concrete, asphalt, waterproof layer, and the like. .
[0021]
The deformation detection means 3 having the above-described configuration is used to detect various deformation situations of the foundation floor slab 9 and the foundation ground 13 that are assumed to occur when the injection liquid 15 is injected into the foundation ground 13 by the injection means 2. Detect and notify the measurement calculation means 7.
The measurement calculation means 7 calculates the optimum injection pressure amount of the injection solution 15 from the measurement data notified from the deformation detection means 3 according to the deformation state of the foundation floor slab 9 and the foundation ground 13 and measures the measurement. This optimum injection pressure amount is notified to the injection means 2 linked to the calculation means 7.
As described above, in the present embodiment, since the injection means 2 includes the injection pressure control mechanism 2c capable of automatically controlling the injection pressure amount of the injection liquid 15, the injection pressure The injection pressure amount of the injection solution 15 can be automatically controlled to the injection pressure amount notified by the measurement calculation means 7 via the control mechanism 2c, but when the injection means 2 does not have the injection pressure control mechanism 2c, the injection means 2 may be provided with a control mechanism for adjusting the injection pressure separately.
[0022]
By the way, the injection apparatus 1 is further provided with a pumping means 6 as shown in FIG. The pumping means 6 pumps the groundwater 14 pushed out from the foundation ground 13 by injecting the injection solution 15 into the foundation ground 13 through the injection means 2, and thereby the groundwater of the foundation ground 13 is pumped. It keeps the head within a certain range.
As shown in FIG. 1, the pumping means 6 has one end inserted into a pumping hole 11 provided at a predetermined position of the foundation ground 13, and a pumping pipe 6 a for pumping groundwater 14 to the ground, and an airpipe to the pumping hole 11. Compressor 6c for supplying compressed air through 6b, and an electromagnetic valve 6e for supplying and blocking compressed air are provided in the air supply pipe 6b, and are inserted into the water pumping hole 11 for groundwater in the foundation ground 13 The liquid level sensor 6f for grasping the head, the liquid level sensor 6f and the electromagnetic valve 6e are interlocked with each other, and the pumping amount of the groundwater 14 is controlled by controlling the supply and shutoff of the compressed air to the pumping hole 11. A groundwater head control mechanism 6d is provided.
[0023]
For example, when the pumping means 6 configured as described above detects that the groundwater head has risen above a predetermined range via the liquid level sensor 6f, the electromagnetic valve 6e is opened via the groundwater head control mechanism 6d, and the compressor Compressed air is supplied from 6c to the pumping hole 11 through the air pipe 6b. Since the groundwater 14 is pumped to the ground by the compressed air through the pumping pipe 6a, it is not necessary to install a pumping pump or the like. When the groundwater head is within a predetermined range due to pumping, the groundwater head control mechanism 6d detects that the groundwater head is within the predetermined range via the liquid level sensor 6f, and the groundwater head As the electromagnetic valve 6e is shut off via the control mechanism 6d and the supply of compressed air to the pumping hole 11 is interrupted, the pumping of groundwater by the pumping pipe 6a is also interrupted.
In addition, when a plurality of pumping holes 11 are provided at close positions and groundwater is to be pumped from each of the pumping holes 11, the same number of air supply pipes 6 b as the pumping holes 11 are provided in the compressor 6 c, and each of the plurality of pumping holes 11 is provided. What is necessary is just to set it as the structure provided with this air feed pipe 6b and the pumping-up pipe 6a, and it is not necessary to provide a pumping pump in each of the some pumping hole 11.
[0024]
An injection method of the existing structure foundation ground, in which the injection solution 15 is injected into the foundation ground 13 below the existing structure 17 using the injection apparatus 1 having the above-described configuration, will be described below.
[0025]
(First step)
First, as shown in FIG. 6, as a first step, for the purpose of injecting the injection solution 15 into the foundation ground 13 under the existing structure 8, the foundation floor slab 9 is penetrated to form the foundation. A plurality of vertical holes 10 reaching a predetermined depth of the ground 13 are constructed with a predetermined spacing interval.
[0026]
(Second step)
Next, as a second step, any one of the vertical holes 10 is positioned as the injection hole 12 for the injection solution 15 and the other vertical hole 10 adjacent thereto is positioned as the pumping hole 11, and the injection device 1 is installed. As shown in FIG. 1, the injection device 1 is installed by placing the injection means 2 in the injection hole 12, the pumping means 6 in the pumping hole 11, and the deformation detection means 3 in the vicinity of the injection hole 12. .
When the deformation detection means 3 is arranged, the moisture sensor 5a and the pF sensor 5b, which are contact type sensors, are arranged in a place where the inside of the foundation ground 13 is exposed. The capacitance / electric resistance sensor 5c and the thermal image sensor 5d, which are sensors, are installed so that a predetermined range in the vicinity of the injection hole 12 can be detected.
[0027]
(Third step)
Thereafter, as a third step, as shown in FIG. 7, the state of deformation of the foundation floor slab 9 and the foundation ground 13 around the injection hole 12 is monitored via the deformation detection means 3, and the amount of deformation is monitored. The injection solution 15 is injected from the injection hole 12 to the foundation ground 13 through the injection means 2 while controlling the injection pressure amount so that the pressure falls within a predetermined limit.
On the other hand, the liquid level sensor 6f of the pumping means 6 is used to monitor the fluctuation of the groundwater head in the foundation ground 13, and when the groundwater head rises above a predetermined range, the groundwater 14 is removed via the pumping means 6. By pumping up the water, the groundwater head is controlled within a predetermined range.
[0028]
For example, when the injection solution 15 is injected into the foundation ground 13, damage such as a crack in the foundation floor slab 9 occurs, and when the eruption or water leakage occurs, as shown in FIG. The moisture sensor 5a and the pF sensor 5b, which are the contact type sensors, are rearranged at the location, and the shape of the damaged portion such as a crack and its adjacent region are shown in FIG. The measurement calculation means 7 determines whether the deformation and damage of the foundation floor slab 9 and the foundation ground 13 are within an allowable range. If it is determined that it is outside the allowable range, the optimum value of the injection pressure amount of the injection solution 15 to the foundation ground 13 is calculated, and the measurement calculation means 7 notifies the injection means 2 of the optimum value of the injection pressure amount. In this way, a predetermined amount of the injection solution 15 is injected into the foundation ground 13 while controlling the injection pressure amount.
[0029]
By injecting all of the plurality of vertical holes 10 provided in the foundation slab 9 into the injection holes 12 in order and repeating the second step and the third step, the injection solution is injected over the entire foundation ground under the existing structure. Then, the ground improvement is completed.
[0030]
According to the above-described configuration, when the injection solution 15 suitable for ground improvement is injected into the foundation ground 13, the deformation of the foundation floor slab 9 of the foundation ground 13 and the existing structure 17 is monitored, and the injection pressure is appropriately set. In addition to the adjustment, pumping is performed so that the groundwater head of the foundation ground 13 is within a predetermined range in parallel with these, so that the excess water pressure in the foundation ground 13 accompanying the injection of the injection solution 15 and the existing water pressure accompanying the excess water pressure The foundation floor slab 9 of the structure 8 and the walls attached to the foundation floor slab 9 can be prevented from being damaged, and the ground foundation 13 can be improved with high accuracy without causing any harmful deformation to the existing structure 17. It becomes possible to carry out.
[0031]
Since the injection device 1 includes the deformation detection means 3, the foundation floor slab 9 of the existing structure 17 is injected while injecting an injection solution 15 suitable for ground improvement into the foundation ground 13 below the existing structure 17. Because it is possible to monitor out-of-plane displacement, inclination, deflection, cracks, etc., such as uplift and subsidence, which are likely to occur in water, and changes in moisture content of the foundation ground 13 and surface leakage, etc. at all times Among them, signs of deformation of the foundation floor slab 9 or the foundation ground 13 can be detected, and it becomes possible to carry out fine and precise injection pressure control related to the injection liquid 15 according to the state of deformation. .
As a result, even in the vicinity of the existing structure 17, it is possible to inject into the foundation ground 13 with high accuracy without causing harmful deformation in the adjacent structure.
[0032]
Further, since the injection means 2 provided in the injection device 1 is provided with the injection pressure control mechanism 2c, the adjustment of the injection pressure amount, which has been complicated so far, can be easily performed. The efficiency can be greatly improved, and the construction accuracy can be greatly improved.
[0033]
Further, the deformation detection means 3 provided in the injection device 1 is provided with a non-contact type distance measuring sensor capable of detecting a change in water content of the foundation ground 13 and water leakage on the surface. Even in a situation where the surface of the ground 13 is covered and invisible, it is possible to accurately grasp the deformation of the foundation ground 13, and the injection pressure is fine and precise according to the deformation situation. Control can be performed.
[0034]
Further, the pumping means 6 provided in the injection device 1 is provided with a compressor 6c that generates compressed air, and pumps the groundwater 14 with a pressing force by supplying the compressed air to the pumping hole 11. Since the structure is provided, it is possible to significantly reduce the work and cost related to the equipment and piping since the pumping pump that has been generally used conventionally is unnecessary.
In such a configuration, even when a plurality of pumping holes 11 are used, the same number of air supply pipes 6b are provided in the compressor 6c, and the air supply pipes 6b and the water pumping pipes 6a are inserted into the plurality of water pumping holes 11, respectively. It is possible to carry out the pumping work of the groundwater 14 more efficiently and at a lower cost.
[0035]
The pumping means 6 described above includes the liquid level sensor 6f that detects the groundwater head and the groundwater head control mechanism 6d that controls the pumping amount of the groundwater 14 based on the notification from the liquid level sensor 6f. In addition, it is possible to pump water easily while controlling the groundwater head within a predetermined range, and it is possible to prevent deformation of the foundation ground due to excessive pumping and subsidence, as well as energy saving of driving power. It becomes possible.
[0036]
【The invention's effect】
According to the method of injecting the injection liquid into the foundation ground of the existing structure according to claim 1, the injection liquid to the foundation ground of the existing structure is injected into the foundation ground under the existing structure. A first step of installing a plurality of vertical holes penetrating through the foundation floor slab of the existing structure and reaching a predetermined depth of the foundation ground; and The second step of positioning a plurality of adjacent vertical holes as pumping holes, and the state of deformation of the foundation floor slab and foundation ground around the injection hole, and the amount of deformation is within a predetermined limit While controlling the injection pressure so as to fit, while injecting the injection solution from the injection hole to the foundation ground, in parallel with this, pumping the groundwater from the pumping hole, Monitoring the fluctuation of the groundwater head, when the groundwater head rises above the predetermined range, And a third step of controlling the groundwater head to be within a predetermined range, and the second step and the third step are repeated for all the vertical holes.
As a result, it is possible to prevent damage to the foundation floor slab of the existing structure and the walls attached to the foundation floor slab due to the excess water pressure due to the injection of the injection solution, and to the existing structure. It is possible to carry out the ground improvement of the foundation ground with high accuracy without causing harmful deformation.
[0037]
According to the injection device for injecting liquid into the foundation ground of the existing structure according to claim 2, the injection liquid to the foundation ground of the existing structure is injected into the foundation ground under the existing structure. An injection device, wherein the injection means pressurizes and injects the injection solution into the foundation ground, the deformation detection means for detecting the deformation situation relating to the foundation ground and the foundation floor slab of the existing structure, and In the foundation ground While controlling the groundwater head to be within the specified range In conjunction with the pumping means for pumping up the groundwater, the deformation detecting means and the injecting means, the deformation detecting means is notified of the amount of deformation of the foundation ground and the foundation floor slab, and injecting into the foundation ground according to the state of deformation It comprises a measurement calculation means for calculating an optimum injection pressure amount of the liquid and notifying the injection means of the injection pressure amount. The deformation detection means is provided with a floor slab change for detecting the deformation and damage of the foundation floor slab. And a foundation ground deformation detecting means for detecting a change in moisture content of the foundation ground and water leakage on the surface.
As a result, when injecting an infusion suitable for ground improvement into the foundation ground under the existing structure, out-of-plane displacement, inclination, deflection, cracks, etc., which tend to occur in the foundation floor slab of the existing structure It is possible to detect changes in the foundation floor slab or foundation ground deformation at an early stage because it is possible to constantly monitor the deformation of the soil, etc., as well as the moisture content of the foundation ground and surface water leakage. Therefore, it is possible to carry out the injection pressure control relating to the injection liquid that is fine and precise according to the state of deformation.
Further, even in the vicinity of the existing structure, it is possible to inject into the foundation ground with high accuracy without causing harmful deformation in the adjacent structure.
[0038]
According to the injection device for injecting liquid into the existing structure foundation ground according to claim 3, the injection means is provided with an injection pressure control mechanism for automatically controlling the injection pressure amount of the injection liquid into the foundation ground.
Thereby, the adjustment of the injection pressure, which has been complicated until now, can be easily performed, work efficiency can be greatly improved, and construction accuracy can be greatly improved.
[0039]
According to the injection device for injecting liquid into the foundation ground of the existing structure according to claim 4, the foundation ground deformation detection means of the deformation detection means is subjected to moisture content change and surface water leakage without contacting the foundation ground. A non-contact distance measuring sensor for grasping is provided.
This makes it possible to accurately grasp the deformation of the foundation ground even in a situation where visual observation is impossible, such as when the surface of the foundation ground is covered. It is possible to implement good injection pressure control.
[0040]
According to the injection device for injecting liquid into the existing ground foundation of the structure according to claim 5, the pumping means is installed in the foundation ground with a compressor that generates compressed air and the compressed air generated by the compressor. An air supply pipe for supplying air to the pumping hole, and a pumping pipe having one end inserted into the pumping hole, and using the pressing force of the compressed air supplied through the air supply pipe, Groundwater is pumped through a pumping pipe.
Thereby, since the pumping pump generally used conventionally is unnecessary, it becomes possible to reduce significantly the operation | work and cost which concern on an installation and piping.
In such a configuration, even when a plurality of pumping holes are used, the same number of air supply pipes may be provided in the compressor, and the air supply pipes and the water pumping pipes may be inserted into each of the plurality of water pumping holes. Can be implemented more efficiently and at low cost.
[0041]
According to the apparatus for injecting liquid into the foundation ground of an existing structure according to claim 6, a liquid level sensor for detecting a groundwater head in the foundation ground, and the liquid level sensor and the compressor linked to the pumping means. The groundwater head control device controls the pumping amount of the groundwater according to the head level notified from the liquid level sensor.
As a result, it is possible to easily pump water while controlling the groundwater head within a predetermined range, and it is possible to prevent deformation of the foundation ground due to excessive pumping and subsidence, and to save energy for driving power. It becomes possible.
[Brief description of the drawings]
FIG. 1 is a diagram showing an outline of an injection device for injecting liquid into an existing structure foundation ground according to the present invention.
FIG. 2 is a graph showing the relationship between the injection pressure and the injection speed of the injection liquid according to the present invention.
FIG. 3 is a diagram showing details of a floor slab deformation detecting means provided in the deformation detecting means according to the present invention.
FIG. 4 is a diagram showing details of a foundation ground deformation detection means provided in the deformation detection means according to the present invention.
FIG. 5 is a diagram showing a soil moisture characteristic curve according to the present invention.
FIG. 6 is a view showing a state of arrangement of vertical holes installed in a foundation floor slab of an existing structure according to the present invention.
FIG. 7 is a view showing a method for injecting an injection liquid into an existing structure foundation ground according to the present invention.
FIG. 8 is a diagram showing a conventional method for injecting an injection liquid into an existing structure foundation ground.
[Explanation of symbols]
1 Injection device
2 Injection means
2a Pressure layer
2b Compressor
2c Injection pressure control mechanism
2d replenishment device
2e Reservoir
2f Supply controller
2g Liquid level detector
2h injection hose
3 Deformation detection means
4 Floor slab deformation detection means
4a Inclinometer
4b Strain sensor
4c Displacement sensor
4d image sensor
4e Distance sensor
5 Basic ground deformation detection means
5a Moisture sensor
5b pF sensor
5c Capacitance / electric resistance sensor
5d thermal image sensor
6 Pumping means
6a Pumping pipe
6b Air pipe
6c compressor
6d Groundwater head control mechanism
6e Solenoid valve
6f Liquid level sensor
7 Measurement calculation means
8 Existing structures
9 Foundation floor slab
10 Vertical hole
11 Pumping hole
12 Injection hole
13 Foundation ground
14 Groundwater
15 Injection solution
16 Water barrier
17 Existing structure
18 Foundation ground
19 Chemical
20 Groundwater
21 Foundation floor slab
22 Wall

Claims (6)

A method of injecting an injection solution into an existing structure foundation ground, injecting an injection solution suitable for ground improvement into the foundation ground under the existing structure,
A first step of installing a plurality of vertical holes that penetrate the foundation floor slab of the existing structure and reach a predetermined depth of the foundation ground;
A second step of positioning any one vertical hole as the injection hole for the injection liquid, and positioning a plurality of vertical holes adjacent thereto as the pumping holes;
While monitoring the deformation state of the foundation floor slab and foundation ground around the injection hole and injecting the injection solution from the injection hole to the foundation ground while controlling the injection pressure so that the deformation amount falls within a predetermined limit In parallel with this, groundwater is pumped from the pumping hole, the fluctuation of the groundwater head is monitored, and when the groundwater head rises above a predetermined range, control is performed so that the groundwater head falls within the predetermined range. The process is composed of
A method for injecting an injection liquid into an existing structure foundation ground, wherein the second step and the third step are repeated for all the vertical holes. An injection device for injecting liquid into an existing structure foundation ground for injecting an injection liquid suitable for ground improvement into the foundation ground under the existing structure,
Injecting means for pressurizing and injecting the injection solution into the foundation ground,
Deformation detecting means for detecting the deformed state related to the foundation ground and the foundation floor slab of an existing structure;
A pumping means for pumping up the groundwater while controlling the groundwater head in the foundation ground to be within a predetermined range ;
In conjunction with the deformation detection means and the injection means, the deformation detection means is notified of the deformation amount of the foundation ground and the foundation floor slab, and the optimum injection pressure amount of the injection liquid to the foundation ground is determined according to the deformation situation. It comprises a calculation operation means for calculating and notifying the injection means of the injection pressure amount,
The deformation detection means includes a floor slab deformation detection means for detecting deformation and damage of the foundation floor slab, and a foundation ground deformation detection means for detecting water content change of the foundation ground and surface water leakage. An injection device for injecting liquid into the foundation ground of existing structures. In the injection apparatus of the injection liquid to the existing structure foundation ground according to claim 2,
An injection apparatus for injecting liquid into the foundation ground of an existing structure, wherein the injection means is provided with an injection pressure control mechanism for automatically controlling the amount of injection pressure of the injection liquid into the foundation ground. In the injection device of the injection liquid to the existing structure foundation ground according to claim 2 or 3,
An existing structure foundation characterized in that the foundation ground deformation detection means of the deformation detection means is provided with a non-contact type remote measuring sensor that grasps the moisture content change and surface water leakage without contacting the foundation ground. A device for injecting liquid into the ground. In the injection device of the infusate to the existing structure foundation ground according to claims 2 to any one of 4,
The pumping means has a compressor for generating compressed air, an air supply pipe for supplying compressed air generated by the compressor to a pumping hole installed in a foundation ground, and a pumping pipe having one end inserted into the pumping hole. With
An apparatus for injecting an injected liquid into a foundation ground of an existing structure, wherein groundwater in the foundation ground is pumped through a pumping pipe using a pressing force of compressed air sent through the air feeding pipe . In the injection device of the injection liquid to the existing structure foundation ground according to claim 5,
The pumping means is provided with a liquid level sensor for detecting a groundwater head in the foundation ground, and a groundwater head control mechanism linked to the liquid level sensor and the compressor,
The groundwater head control device controls the pumping amount of the groundwater according to the water head level notified from the liquid level sensor.

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