JP2006312811A - Grouting construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To not only enable grouting operations best suited to respective layers of the ground to be simultaneously or selectively applied to the ground where ground conditions of the respective layers are different from one another but also enable three-dimensional grouting to be performed in vertical and horizontal directions in the ground. <P>SOLUTION: This grouting construction method is used for injecting an injection liquid through an injection pipe device A. In the device A, a plurality of bag packers 6 are provided at intervals in the longitudinal direction of a pipe wall 10; an outer-pipe ejection port 5 is formed between the bag packers 6 adjacent to each other; and an outer pipe 9 forming an out-of-pipe space 8, and an inner pipe 13 forming an injection position 27 are provided. An injection-liquid channel 15 and a packer channel 16 are each independently provided in the inner pipe 13; a fluid is fed into an expandable/contractible packer 12 through the packer channel 16, so that the packer 12 can be expanded; and an in-pipe space 17 is formed in a gap 31 between the inner and outer pipes which is sandwiched by the packer 12. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a multi-point ground injection method in which ground injection liquid is injected into a ground such as soft ground in particular, and in particular, for the ground whose ground condition is different for each layer, optimal injection for each of these layers is performed. Not only can it be achieved simultaneously or selectively, but also allows three-dimensional injection in the vertical and horizontal directions in the ground, and can arbitrarily control injection from a plurality of injection tube devices, It is possible to inject simultaneously through a plurality of injection pipe devices, which improves the reliability of infiltration injection into the fine soil layer and shortens the injection period by rapid construction, especially for large soils such as liquefaction prevention work. The present invention relates to a ground injection method capable of performing ground improvement quickly and reliably.

  Here, the ground injection solution is an injection material for solidifying the ground, such as a solid consolidation injection material for strengthening or stopping the ground such as soft ground, industrial waste, etc., and a harmful material from the pollution material. A solidifying material for forming a water-stopping layer that prevents leakage, an injectable liquid material containing chemical substances for pollution-free pollution, or a heavy metal fixing material that chemically inactivates heavy metals, etc. .

  Since the ground usually has different hydraulic conductivity and porosity for each layer, the ground conditions are different for each layer. Conventionally, when injecting chemicals into this type of ground, although not shown in the figure, injection tubes are inserted into the ground individually or at intervals, and the injection stage is sequentially moved up or down through these injection tubes. The injection solution was injected.

  By the way, the biggest problem in injecting a chemical solution is infiltration into a fine sand layer having a small hydraulic conductivity or homogeneous infiltration into the ground composed of different soil layers.

The water permeability to the fine sand layer is usually k = 10 ⁻³ to 10 ⁻⁴ cm / sec. In order to inject the chemical solution to such a soil layer so as not to cause the destruction of the ground, in terms of penetration theory The low pressure injection must be performed at a low discharge rate of 1 liter or less per minute to several liters.

However, in the known injection method described above, one set of injection pump is used for each injection tube. In such an injection method, from the economical aspect that it is desirable to shorten the construction period as much as possible, and from the aspect of the performance limit of the pump, the discharge amount must be 10 to 20 liters per minute, and the injection pressure becomes high. Cause destruction. For this reason, the ground rises and the penetration and consolidation of a fine soil layer becomes insufficient.

  In addition, when injecting into different soil layers, when the soil layer changes, it is practically difficult to change the injection rate in response to the soil layer change or to control the injection amount. Then, the injection solution spreads in a large amount, or a certain layer penetrates only a little. In such an injection state, there is a problem that the continuity between adjacent solid bodies cannot be obtained.

  As an earlier application by the present applicant, an invention described in JP-A-12-45259 has been filed. According to this, a plurality of injection pipes are arranged in the ground, and when a ground improvement material is injected into the ground from each discharge port through the plurality of injection pipes, a plurality of unit pumps are provided in one plant, The injection solution is pumped to each injection pipe by a multi-unit pump that simultaneously operates a large number of these unit pumps with a single drive source, and injected into the ground from the discharge port.

  In the known technique described above, since the injection capillary tube requires a long distance from the pump plant to the injection hole, it is necessary to use an injection solution having a low viscosity and a long gel time. However, once the infusion solution with a long gel time begins to deviate from the ground surface or a rough layer in the ground, the gelation time cannot be shortened, so the infusion must be stopped, and during that time grout is generated in the infusion capillary. There were inconveniences such as gelation.

In addition, since a large number of unit pumps constituting a multi-unit pump are driven simultaneously by a single drive source, the ground conditions at each discharge port are different, and therefore all units are in spite of the optimum injection conditions being different. Since the pump was driven under the same conditions, it was impossible to optimally inject each outlet.
JP 2003-232030 A JP 2002-256542 A

  Therefore, as described above, the object of the present invention is to further develop the low-pressure osmotic injection of grouting to a wide area of ground that has been developed so far, enabling low-pressure osmotic injection with a large discharge amount, and each grouting injection. Depending on the injection status of the pipe, the injection speed, injection pressure, injection stop, restart, gelation time, etc. of each unit pump can be controlled arbitrarily, and the operation of many unit pumps can be controlled simultaneously for injection It is an object of the present invention to provide a multi-point ground injection method that improves the above-mentioned drawbacks of the known technology, which makes it possible to grasp and manage the entire situation.

  Furthermore, another object of the present invention is to prevent this by injecting a grout with a short gelation time when a coarse filling by primary injection or when a grout with a long gelation time starts to deviate during the injection. It is possible to freely inject a grout with a long gelation time, a single injection of a short grout, a combination injection, a multi-stage simultaneous injection, etc., and to dramatically improve the practicality of multi-point injection. .

  Furthermore, another object of the present invention is to provide an optimal injection with a variable discharge rate of about 1 liter to 30 liters / minute for a fine-grained soil layer with little water permeability or a ground with different ground conditions for each layer. At the same time or selectively, unit pumps on the order of 4-50 liters per infusion unit can be combined, so that 4-50 units of pump per set at a time, ie 1 × ( From 4 to 50) l / min to 30 x (4 to 50) l / min, in principle 4 to 1500 l / min per set, practically 50 to 500 l / min injection rate per set In addition, permeation between soil particles is possible by low pressure permeation injection per injection stage. In addition, three-dimensional injection in the vertical and horizontal directions is possible in the ground, which improves the reliability of infiltration into the fine soil layer and shortens the injection period by rapid construction. An object of the present invention is to provide a multi-point ground injection method that improves the above-described drawbacks of the known techniques.

  Furthermore, the problem of the present invention is that the ground injection solution that can be used is not only a solution-type injection solution, but also a suspension-type injection solution, whereby an arbitrary injection according to the ground situation for each injection point can be selected, An object of the present invention is to provide a multi-point ground injection method that improves the above-mentioned drawbacks of the known technology.

  In order to achieve the above-mentioned problems, according to the ground injection method of the present invention, a plurality of injection pipe devices are embedded in the ground, and the ground injection method for injecting an injection solution through these injection pipe devices is an independent method. In the ground injection method in which an individual unit pump operated by a driving source and controlled by a central control device is connected to each injection pipe device, and an injection liquid is injected into the ground by the operation of the unit pump. The tube device is provided with a plurality of bag packers that are inflated with a curable fluid at intervals in the tube wall longitudinal direction, and has at least one outer tube discharge port covered with a rubber sleeve between adjacent bag packers. And an outer tube that forms an outer space between the bag packer and the drilling wall adjacent to each other, and a movably inserted into the outer tube, and a pair of expansion / contraction packers are provided at intervals in the longitudinal direction, Shape of ejection position An inner pipe that feeds the infusate and has an ejection port positioned at the ejection position, and a packer channel that sends the fluid to the expansion / contraction packer and inflates the same. Respectively, and a fluid is sent to the pair of expansion / contraction packers through the packer flow path to inflate, thereby forming a space in the pipe between the inner and outer pipes sandwiched by the pair of expansion / contraction packers. The injection liquid is injected into the ground through the inner tube space, the outer tube discharge port, and the outer space through the outer tube discharge port so as to match the outer tube space.

  The present invention having the above-described configuration can not only achieve optimum injection simultaneously or selectively for each layer, but also in the vertical and horizontal directions in the ground, with respect to the ground having different ground conditions for each layer. Three-dimensional injection is also possible, and injection from a plurality of injection pipes can be arbitrarily controlled, and injection can be performed simultaneously through a plurality of injection pipes. Improving and shortening the pouring period due to rapid construction, it is possible to construct the soil of large volume soil quickly and reliably, especially as liquefaction prevention construction.

In general, in the conventional injection method, the injection pipe pitch is set to 0.8 m to 1 m, and the injection stage is set to 0.25 to 0.5 m as a unit, and 300 l to 400 l per 1 m ³ of the injected soil volume, considering the economy. The injection rate was basically 8 to 20 l / min. However, in the actual ground, in order to infiltrate the injected solution between the soil particles without causing the ground destruction, it is often necessary to set the injection rate to 8 l / min or less, for example, 1 to 5 l / min. However, the conventional method of injecting with one injection pump for one injection point is economically impossible at such an injection rate.

  On the other hand, in recent years, rapid construction of ground improvement of large-capacity soil such as liquefaction prevention work has been required. In this case, it is necessary to inject a large amount of injection liquid from a single injection tube over a long period of time from the economical viewpoint. That is, in the liquefaction prevention construction, the injection hole interval must be 1.5 to 4 m from the economical point of view.

For example, when the injection hole interval is set to 2 m in the positive direction,
(1) Injection pipe embedding interval P = 2 m × 2 m square arrangement (2) Injection speed f = 20 l / min (3) Improved flat area per hole in the injection pipe is Ap = 2 m × 2 m = 4 m ²
(4) When the amount of improved soil per stage (m ³ ) is V = 2 m (the improved thickness per stage) × 4 m ² = 8 m ³ ,
(5) Injection amount per stage (kl)
Q = Vx (0.35-0.04) = 8 × (0.35-0.04) m ³
= 2.8 m ^{3 to} 3.2 m = 3.0 m ³ (average)
(0.35-0.04: Injection rate, that is, ratio of injected chemical solution per 1 m ^{3 of} improved soil volume)
(6) Injection time per stage t ₁ = 3 kl ÷ 0.02 kl / min = 150 minutes
= 2.5 hours (infusion duration)
And you have to inject for a long time. In this case, if the injection flow rate per minute is 5 l / min, the above four times injection time, that is, 10 hours are required.

Likewise, when the injection hole interval is 4 m in the positive direction,
Ap = 4 m × 4 m = 16 m ² ,
One stage of improved soil volume is
V = 2 m (improved thickness) × 16 m ³ ,
= 32m ³
One-stage injection amount (kl) is Q = Vx (0.35-0.40)
= 32 × (0.35-0.40)
= 11.2 to 12.8 kl≈12 kl (average),
If the injection rate f = 20 l = / min,
Injection time per stage t = 12 kl / 0.02 kl
= 600 minutes = 10 hours. In this case, if the injection flow rate per minute is 5 l / min, the above four times the injection time, that is, 40 hours are required.

  However, since such injection requires a long time for injection, and the injection coverage per one is wide, the injection liquid is dispersed and easily deviates to the ground surface and the periphery, and a uniform injection effect is obtained. Hateful. In addition, gelation proceeds in the soil during the injection over a long period of time, which changes the ground injection conditions and makes the injection effect uncertain. Furthermore, since a long injection work is required, not only the construction period becomes longer, but also the use of the area becomes impossible during the construction period. In order to prevent this, if the interval between the injection holes is reduced, the injection amount per stage is reduced and the injection time is shortened. However, a large number of injection holes must be drilled, and the construction period becomes very long. .

  Therefore, in the present invention, the ground injection liquid is injected into a plurality of injection points in the ground from a plurality of unit pumps through a plurality of injection liquid supply systems by collective management by a central control device, and at this time, from the injection liquid supply system The injection status is displayed on the screen, and monitoring is performed by batch monitoring, and injection pipe devices with a large penetration source by bag packer are embedded in the ground and injected, thereby reducing the discharge amount per injection point per minute. Larger allows inter-soil particle infiltration and achieves large volume injection by simultaneously injecting from multiple injection points to allow economic ground improvement of large volume soil.

More specifically, in the method of the present invention, when the bag packer length is 1 m and the interval between adjacent bag packers is 1 m, the length of one stage is 2 m, and the injection length is 1 m for one stage and the circle is about 10 cm in diameter. It is injected from a columnar penetration source. Even if the injection rate per stage per injection is 25 liters / minute, the penetration rate is about 3 times higher than the injection rate of about 8 liters / minute from a spherical infiltration source having a diameter of about 10 cm in normal conventional injection. However, since the size of the penetration source is 10 times, the penetration resistance is lower than the conventional one. For this reason, osmotic injection at a sufficiently low pressure is possible even when the injection speed is three times. Therefore, the time required for injection is about 0.3 hours for the former and about 200 minutes for the latter.

  Furthermore, if simultaneous injection is possible with a pump of 10 units per set, simultaneous injection at 10 locations is possible. Therefore, ground improvement of 10 times larger capacity soil can be performed in the same required time. The difference in the amount of injection that can be injected in the same time is not measured compared to the conventional injection method. Moreover, the advantages of the unit pump injection for 10 units cannot be realized by managing them collectively with one centralized management system.

  Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is an explanatory diagram showing the principle diagram of a multipoint ground injection system used in the ground injection method of the present invention. A multi-point ground injection system X in FIG. 1 is a ground injection construction method in which a plurality of injection pipe devices A are embedded in the ground 1 and the injection liquid in the storage tank 22 is injected through these injection pipe devices A. Are connected to an infusion pipe device A in the ground 1 through a conduit 21, and operated by the independent drive source 2 and controlled by the central control device 3. The injection liquid in the storage tank 22 is injected into the ground through the conduit 21 from the outer pipe discharge port 5 of the injection pipe device A in the ground 1.

  Further, the aforementioned independent unit pumps 4, 4... 4 are provided with rotational speed transmissions 32, 32... 32 such as inverters, and are connected to the centralized management device 3 and controlled. Further, the conduits 21, 21,... 21 connecting the unit pumps 4, 4,... 4 to the injection pipe devices A, A..A are respectively connected to the central control device 3 and controlled in the same manner as described above. Flow rate pressure detectors 26, 26,.

  With the above-described configuration, in the present invention, a flow rate / and / or pressure data signal from the flow pressure detector 26 is transmitted to the central control device 3, and the ground injection liquid in the storage tank 22 is sent to each unit pump 4, 4,. 4 is pumped to each injection pipe device A, A,... A at an arbitrary injection speed, injection pressure, or injection amount, and multiple points are injected into the injection point 25 from the plurality of outer pipe discharge ports 5, 5,. .

  Examples of the unit pump 4 used in the present invention include a piston pump, a plunger pump, a diaphragm pump, a squeeze pump, and a snake pump. These pumps, except for the piston pump, are all small in size, simple in structure, and less likely to break down. Therefore, not only solution type but also suspension type grout can be used. Is suitable.

  As shown in FIGS. 2 and 3, the injection tube apparatus A used in the present invention is provided with a plurality of bag packers 6, 6... 6 that are inflated with a curable fluid at intervals in the longitudinal direction of the tube wall 10. Between the adjacent bag packers 6, 6, there is at least one outer tube discharge port 5 covered with a rubber sleeve 11 and between the adjacent bag packers 6, 6 and the bore wall 7. An outer tube 9 that forms the outer space 8 and an inner tube 13 that is movably inserted into the outer tube 9 and that is provided with a pair of expansion / contraction packers 12 and 12 spaced apart in the longitudinal direction to form an ejection position 27. It has.

  An injection liquid is supplied to the inner tube 13 described above, and an injection liquid flow path 15 in which the discharge port 14 is located at the ejection position 27 and a packer flow path 16 that sends the fluid to the expansion / contraction packers 12 and 12 and expands them. Prepare each independently. First, the ejection position 27 is aligned with the bag packer 6, and a pair of expansion / contraction packers 12, 12 are inflated by sending a fluid such as water, air, or inert gas through the packer flow path 16, and the pair of expansion / contraction packers 12. , 12 is formed between the inner and outer tubes sandwiched between the inner and outer tubes. In this state, a curable suspension such as cement is sent to the bag packer 6 through the injection liquid flow path 15, and the bag packer 6 is expanded through the discharge port 14 and the pipe inner space 17. Further, the bag packer 6 is expanded in the same manner as described above while contracting the expansion / contraction packers 12 and 12 and moving the inner tube 13.

  The bag packer 6 is formed of a water-permeable bag body, has a diameter 1.2 to 5.0 times the diameter of the hole 19 and has a bag body length L, and a gap between adjacent bag bodies. When A is A, A ≦ 2L. Accordingly, when the bag packer 6 is formed by filling the bag body with a curable suspension and inflating it, the bag body 6 has a diameter larger than the drilling diameter, so that the bag packer 6 penetrates the injected solution into the ground area around the packer. A dense ground packer 20 that is difficult to form is formed.

  The movement of the inner pipe is performed by operating the inner pipe lifting device 18 shown in FIG. As shown in FIG. 1, this operation is performed by connecting the inner pipe lifting device 18 to the central management device 3 and controlling the elevation of the inner pipe 13 by the central management device 3. 19 is a drilling hole.

  Next, as shown in FIG. 3, the ejection position 27 of the inner tube 13 is made to coincide with the outer space 8, and the injection solution is injected from the outer tube discharge port 5 into the inner space 17, the outer tube discharge port 5 and the outer space 8. Then, it is injected into the ground 1.

  As shown in FIG. 1, the central management device 3 is connected to the packer flow path 16 via the packer fluid storage tank 23, and controls the fluid feed control unit that controls the fluid feed to the pair of expansion / contraction packers 12, 12. And a drive control unit for controlling each drive source 2 connected to the rotational speed transmission 32 provided in the drive source 2 of each of the plurality of independent unit pumps 4 and injection into the ground 1 from each unit pump 4 And a recording display unit for recording and displaying injection information relating to the injection pressure and the injection speed, and further to the inner pipe lifting device 18 as described above. And an elevation control unit that controls the elevation of the inner pipe.

  FIG. 4 is an explanatory view of another specific example of the multi-point ground injection system X used in the present invention. The storage tank 22, the plurality of unit pumps 4, 4..., The plurality of injection pipe devices A, A ・ ・ A is basically provided.

  The storage tank 22 includes an A liquid tank 22a and a B liquid tank 22b, and has a structure in which the A liquid and the B liquid in these tanks are separately guided to the injection pipe device A and merged. Two injection pipe devices are arranged at the injection point 25 of the ground 1, and liquid A and liquid B are pumped to the two injection pipe devices A and A, respectively, and injected from the outer tube discharge port 5 to the injection point 25. After that, they merge in the ground 1 and react, or different types of injection solutions are injected simultaneously or with a time difference.

  The series of unit pumps 4, 4... 4 includes a large number of independent unit pumps 4, 4... 4, and these unit pumps 4, 4. The central control device 3 operates as a set of injection devices together, and is connected to the A liquid tank 22a and the B liquid tank 22b via conduits 21, 21,.

  The injection pipe device A has an outer pipe discharge port 5 at its tip, and a plurality of unit pumps 4, 4 are embedded in a plurality of injection points 25, 25,. .. And 4 and unit pumps 4, 4... 4 connected to the B liquid tank 22b, respectively.

  Furthermore, the above-described independent unit pumps 4, 4... 4 are respectively provided with rotational speed transmissions 32, 32. These rotational speed transmissions 32, 32,... 32 are respectively connected to the central control device 3 (indicated by broken lines in the figure) and controlled. As a result, the ground injection liquids A and B in the liquid A tank 22 a and the liquid B tank 22 b are joined at an arbitrary injection speed by the operation of the unit pumps 4, 4. It is pumped to the devices A, A... A, and is injected into the ground 1 from the discharge ports 5, 5.

  Further, a flow rate detector 26 is installed in each of the conduits 21, 21... 21 leading from the unit pumps 4, 4. The flow rate and / or pressure data signals of the ground injection liquid detected from these detectors 26 are transmitted to the centralized management device 3 as indicated by broken lines. Then, as shown in FIG. 4, the ground injection solution is independently monitored from a plurality of unit pumps 4, 4... Multi-point injection is performed at a plurality of injection points 25 in the ground 1.

  The operation of the multiple unit pumps 4, 4... 4 is controlled via the rotational speed transmission 32 based on the flow rate and / or pressure data signal of the ground injection solution transmitted to the central control device 3. By this control, the ground injection solution is maintained at a desired pressure and / or flow rate, and is supplied to each of the injection pipe devices A, A,.

  Furthermore, the flow rate and / or pressure data signal of the ground injection liquid detected from the flow rate pressure detector 26 is transmitted to the central management device 3, and these data are displayed on the injection monitoring panel 33 of the central management device 3. By performing the batch monitoring of the injection status, the injection is performed while maintaining the respective injection pressure and / or flow rate in the injection tube device A within a predetermined range, and the injection is completed, stopped, or continued based on the information of the above data. Or re-injection. Reference numeral 34 denotes a valve such as a switching valve, a stop valve, or a return valve. As shown in FIG. 4, the valve 34 can be connected to the centralized management device 3 and controlled.

  The injection monitoring panel 33 includes “time data” such as injection date, injection time, “location data” such as injection block number, injection hole number, injection point, injection pressure, and flow rate (unit time flow rate and totalization). The “injection data” such as the flow rate) is displayed and recorded in the injection data in the centralized management device 3. In this way, the operation of each of a large number of unit pumps 4, 4,... 4 leading to the plurality of injection pipe devices A, A... A can be optimally controlled according to the injection situation of each injection pipe device A. The plurality of unit pumps 4, 4,... 4 can be managed collectively. 30 is a construction display panel, and 31 is a daily report working device.

FIG. 5 is an example in which the pressure flow rate and the integrated flow rate of each of the 10 injection pipe devices A, A,. The screen of FIG. 5 is described in detail as follows.
Upper two screens:
Group 1: No. 1 to No. 5 integrated flow rate and maximum pressure digital display Group 2: No. 6 to No. 10 integrated flow rate and maximum pressure digital display integrated flow rate are infusions for 20 minutes. The maximum pressure was displayed every 30 seconds, and the maximum value from 19 minutes 30 seconds to 20 minutes was displayed. If the maximum pressure continues to be higher than the set pressure, it is judged that the injection of the liquid delivery system is finished. Further, when the integrated flow rate reaches the set integrated flow rate, it is determined that the injection of the liquid feeding system is finished.

Lower half 2 screens:
Group 3: Flow and pressure trend display for No. 1 to No. 5
Group 4: Flow and pressure trend display of No. 6 to No. 10
The left side of each of the two screens shows the instantaneous flow rate and instantaneous pressure chart corresponding to the passage of time (t) in each liquid delivery system, and the right side shows the average instantaneous flow rate (l / min) from 19 minutes 30 seconds to 20 minutes. And mean instantaneous pressure (MPa).

  4 will be described with reference to an operation flowchart of the central management apparatus 3 shown in FIG. In FIG. 4, first, the specified pressure value (appropriate pressure range), specified injection amount (appropriate integrated injection amount range) of the injection specification file for No. 1 to No. 10 of the liquid delivery system, that is, the desired injection pressure, The flow rate (flow rate per unit time and / or integrated flow rate) is preset in the central control device 3 (system specification setting registration), and then the No. 1 to No. 10 start switches of the central control device 3 are turned ON. Start data recording.

At this time, the construction display panel 35 is also turned ON by a lamp. The injection monitoring board 33 displays the injection data from the injection liquid feeding system on the screen, and when these data reach the set value,
The central control device 3 outputs a completion signal and displays it on the injection monitoring board 33, and also displays a completion state with a lamp on the construction display board 35 and outputs a signal for closing the stop valve of the liquid feeding system.

  After the injection of all the liquid supply systems is completed, the data recording by the centralized management device 3 is completed by turning off the start switch of the centralized management device 3. Based on the recorded data, a daily report creation device 36 creates a report such as a daily report and prints it out with a printer.

  In FIG. 4, the centralized management device 3 records and monitors the flow rate or pressure data from the flow rate pressure detectors 26 arranged in each of the 10 liquid supply systems. In addition, the apparatus 3 completes injection according to a predetermined pressure value (or a specified pressure range), a specified instantaneous flow rate value (or a specified instantaneous flow rate range), and a specified integrated injection amount (or a specified integrated injection amount range). Automatic judgment is made.

The details are as follows.
Measurement data flow rate: 0 to 30.0 l / min
Pressure: 0 to 3.00 MPa
Calculation data Accumulated flow rate: 0 to 99999 l
Maximum pressure: 0 to 3.00 MPa
Recording medium Flash memory card recording time 1 minute data recording (30 seconds or 10 seconds data is acceptable)
(Flow rate, pressure, integrated flow rate, maximum pressure for 10 systems)

  Injection monitoring: Accumulated injection volume data and pressure data are monitored with the specified injection volume and pressure registered based on the injection specification file. When the injection pressure is equal to or higher than the specified pressure, or when the injection amount (integrated flow rate) reaches the specified integrated injection amount (specified integrated flow rate), the central control device 3 outputs a stop valve closing signal. At the same time, the lamp is turned on to indicate completion. (Completion by pressure regulation or completion by regulation injection amount is displayed on the screen.)

  Monitoring screen: The data for 10 liquid feeding systems shown in FIG. 3 (total 40 data of flow rate, pressure, integrated flow rate and maximum pressure) are displayed on the injection monitoring board 33 on one screen.

  FIG. 7 is a cross-sectional view of an example in which a plurality of injection liquid channels 15 are provided. A pair of expansion / contraction packers 12 and 12 are supplied as the injection liquids A and B through separate injection liquid channels 15 and 15, respectively. The liquid is fed to the ejection position 27 between them, mixed and injected into the ground 1 from the outer tube discharge port 5. In this case, the ejection position 27 is sandwiched between the bag packers 6 and 6, and the A and B liquids are mixed between the pair of expansion / contraction packers 12 and 12 and injected into the predetermined ground 1.

  8 to 10 are cross-sectional views of an example of an injection tube device having a plurality of injection channels and a plurality of expansion / contraction packers, and a plurality of inner tubes 13 movably inserted into the outer tube 9 are arranged in the longitudinal direction. Are provided at intervals to form a plurality of ejection positions 27, 27,... 27, each of the plurality of ejection positions 27, 27,. It arrange | positions so that it may be located in the space 8. A plurality of injection liquid flow paths 15 in which an injection liquid is sent to the inner tube 13 and the discharge ports 14 are separately located at the respective ejection positions 27, and a packer flow path 16 that sends the fluid to the expansion / contraction packer 12 and expands it. Are provided independently. As a result, a fluid is sent to the plurality of expansion / contraction packers 12, 12... 12 through the packer flow path 16 to inflate, thereby forming a pipe inner space 17 in the inner / outer pipe gap 31 sandwiched between the adjacent expansion / contraction packers 12, 12. Thus, each ejection position 27 is made to coincide with the extra-tube space 8, and an injection solution is injected from the discharge port 14 through the intra-pipe space 17 and the outer tube discharge port 5 and into the ground 1 through the extra-tube space 8.

  Further, the injection tube device A is inserted into the hole 19 of the ground 1, and is provided with a bag packer 6 that is inflated with a plurality of fluids at intervals in the longitudinal direction of the outer wall, and between the bag packers 6 and 6 adjacent to each other. An outer tube 9 having at least two outer tube discharge ports 5 covered with a rubber sleeve 11 and forming a tube outer space 8 between the adjacent bag packers 6 and 6 and the drilling wall 7; The inner tube 13 is inserted into the outer tube 9 so as to be movable, and three or more expansion / contraction packers 12 are provided at intervals in the longitudinal direction, and form a plurality of ejection positions 27. A plurality of injection liquid flow paths 15 for supplying an injection liquid to the inner tube 13 and having discharge ports 14 located at different ejection positions 27, and a packer flow path 16 for supplying the fluid to the expansion / contraction packer 12 for expansion. Are provided independently. Then, a fluid is sent to three or more expansion / contraction packers 12 through the packer flow path 16 to expand, and a plurality of internal spaces 17 are formed in the gaps 31 between the internal and external tubes sandwiched between the expansion / contraction packers 12 adjacent to each other. The plurality of ejection positions 27 are made to coincide with the same external space 8, and the injection solution passes through the separate internal space 17 from the discharge port 14, passes through the external tube discharge port 5, and passes from the same external space 8 to the ground. Inject into 1.

  Specifically, FIG. 8 is a cross-sectional view of an example in which a plurality of injection liquid channels 15 are provided, and three or more expansion / contraction packers 12 are provided to provide a plurality of ejection positions 27. The liquid A and the liquid B are supplied to the different ejection positions 27 and 27 through the separate injection liquid flow paths 15 as injection liquids, and injected into the ground 1 from the outer tube discharge port 5. In this case, the injection region is long in a columnar shape, and has the advantage of obtaining a large penetration source.

  FIG. 9 is a cross-sectional view of an example in which a plurality of ejection positions 27 are provided with a bag packer interposed therebetween. A liquid and B liquid are separately injected into the ground 1. In this case, for example, a quick-set injection solution as the A solution and a slow-release injection solution as the B solution can be injected separately to enable combined injection.

  FIG. 10 is a cross-sectional view of an example in which a plurality of ejection positions 27 are provided adjacent to each other, and the adjacent ejection positions 27 and 27 are disposed between the upper and lower bag packers 6 and 6. In this case, since the A liquid and the B liquid are mixed outside the outer tube 9, the liquid A and B are suitable for injecting an injection liquid that is instantly combined. 7, 8, and 9, 28 is a pump, 29 is a flow meter, 30 is a pressure gauge, and 31 is a gap.

  FIG. 11 is an explanatory view schematically showing the injection system according to the present invention shown in FIG. The injection | pouring condition to the ground 1 of an injection liquid is understood modelly from FIG.

  The present invention having the above-described configuration can not only simultaneously or selectively achieve optimum injection for each layer, but also three-dimensionally in the vertical and horizontal directions in the ground. Injection can be controlled and injection from multiple injection pipes can be controlled arbitrarily, and simultaneous injection through multiple injection pipes improves the reliability of osmotic injection into fine soil layers. However, due to the rapid construction, the pouring period is shortened, and it is highly possible to improve the ground of large volumes of soil, especially as liquefaction prevention work.

It is a flow sheet of one specific example of the ground injection system used for the present invention. It is sectional drawing of one specific example which expands the bag packer of the injection tube apparatus used for this invention. It is sectional drawing showing the injection | pouring state of the injection tube apparatus used for this invention. It is a flow sheet of another injection system used for the present invention. It is an example of the screen display which represented the integrated flow volume and the maximum pressure about 10 liquid feeding systems, and the flow volume and the pressure on the injection | pouring monitoring board. It is an operation flowchart of a centralized management apparatus. It is sectional drawing of the other specific example of the injection tube apparatus used for this invention. It is sectional drawing of the other specific example of the injection tube apparatus used for this invention. It is sectional drawing of the other specific example of the injection tube apparatus used for this invention. It is sectional drawing of the other specific example of the injection tube apparatus used for this invention. It is a model figure showing the principle of the injection system of the present invention.

Explanation of symbols

A Injection tube device X Multi-point ground injection system 1 Ground 2 Drive source 3 Centralized control device 4 Unit pump 5 Outer tube outlet 6 Bag packer 7 Drilling wall 8 Outer space 9 Outer tube 10 Tube wall 11 Rubber sleeve 12 Expansion / contraction Packer 13 Inner pipe 14 Discharge port 15 Injection liquid flow path 16 Packer flow path 17 Pipe inner space 18 Inner pipe lifting device 19 Drilling hole 20 Ground packer 21 Conduit 22 Storage tank 23 Packer fluid storage tank 24 Valve 25 Injection point 26 Fluid pressure detection 27 Ejection position 28 Pump 29 Flow meter 30 Pressure gauge 31 Clearance 32 Rotational speed transmission 33 Injection monitoring panel 34 Valve 35 Construction display panel 36 Daily report work device

Claims (10)

  A ground injection method in which a plurality of injection pipe devices are buried in the ground, and an injection solution is injected through these injection pipe devices, which are operated by an independent drive source and individually controlled by a central control device. In the ground injection method in which unit pumps are connected to each injection pipe device, and the injection liquid is injected into the ground by the operation of the unit pump, the injection pipe devices are expanded with a curable fluid at intervals in the longitudinal direction of the pipe wall. A plurality of bag packers that have at least one outer tube discharge port covered with a rubber sleeve between adjacent bag packers, and an extra-tube space between the adjacent bag packer and the drilled wall And an inner tube that is movably inserted into the outer tube and is provided with a pair of expansion / contraction packers spaced apart in the longitudinal direction to form an ejection position. The injection liquid is fed and the discharge port is An infusate flow path located at the exit position and a packer flow path for sending and inflating fluid to the expansion / contraction packer are provided independently, and the fluid is sent to the pair of expansion / contraction packers through the packer flow path for expansion. A space between the inner and outer pipes sandwiched between the pair of expansion / contraction packers is formed, the pipe inner space is made to coincide with the outer space of the pipe, and the injection liquid is supplied from the outer pipe outlet to the inner space, the outer pipe outlet and the pipe. Ground injection method characterized by injecting into the ground through the outer space.   2. The ground injection method according to claim 1, wherein the inner pipe has a plurality of injection liquid passages each having a discharge port located at an ejection position.   2. The ground injection method according to claim 1, further comprising an inner pipe lifting device, wherein the inner pipe is moved up and down in the outer pipe to a predetermined injection stage by the lifting means. 2. The central control device according to claim 1, wherein the central control device is connected to the packer flow path, and is connected to a fluid feed control unit that controls the fluid feed to the pair of expansion / contraction packers, and a drive source of a plurality of independent unit pumps. It is connected to a drive control unit that controls each drive source and a flow rate pressure detector arranged in a conduit that leads from each unit pump to the injection pipe device in the ground, and provides injection information regarding injection pressure, injection volume, and injection speed. The ground injection method according to claim 1, further comprising a recording display unit for recording and displaying.   5. The ground injection construction method according to claim 4, wherein the central management device further includes a lifting control unit that is connected to the inner tube lifting device and controls the lifting of the inner tube.   2. The inner tube movably inserted into the outer tube according to claim 1, wherein a plurality of expansion / contraction packers are provided at intervals in the longitudinal direction to form a plurality of ejection positions, and each of the plurality of ejection positions is at least one by one. Arranged to be located in the space outside the tube, the injection solution is sent to the inner tube, and a plurality of injection solution passages whose discharge ports are separately located at the respective ejection positions and fluid to the expansion / contraction packer A packer flow path that is sent and expanded independently, and a fluid is sent to a plurality of expansion / contraction packers through the packer flow path to be expanded to form an internal space between inner and outer pipes sandwiched between adjacent expansion / contraction packers. The ground injection method according to claim 1, wherein each ejection position is made to coincide with the space outside the tube, and the injection solution is injected from the discharge port through the space inside the tube and the discharge port of the outer tube, and into the ground through the space outside the tube.   7. The method according to claim 6, wherein the inner pipe is moved so that a plurality of ejection positions are matched to at least one other pipe outer space one by one, and the injection liquid is passed from the outlet through the inner pipe through the outer pipe outlet. The ground pouring method according to claim 6, wherein the ground pouring method is poured into the ground from outside space.   3. The injection tube device according to claim 1, wherein the bag packer is inserted into a hole in the ground, and is provided with a bag packer that is inflated by a plurality of fluids at intervals in the longitudinal direction of the outer wall, and is covered with a rubber sleeve between adjacent bag packers. An outer tube having at least two outer tube discharge ports and forming a space outside the tube between the adjacent bag packer and the drilling wall, and is inserted into the outer tube so as to be movable, in the longitudinal direction. And three or more expansion / contraction packers are provided at intervals, and an inner pipe that forms a plurality of ejection positions, and an injection liquid is fed into the inner pipe, and the discharge ports are arranged at different ejection positions. A plurality of infusion liquid channels positioned respectively and a packer channel for sending and inflating fluid to the expansion / contraction packer are provided independently, and the fluid is sent to three or more expansion / contraction packers through the packer channel. Inner and outer tubes that are inflated and sandwiched between adjacent expansion and contraction packers A plurality of inner spaces are formed in the gaps, and the plurality of ejection positions are matched with the same outer space, and the injection solution is passed through the outer tube discharge port through each separate tube space, A ground injection method characterized by injecting into the ground from the same extra-space.   9. The same extra-tube space according to claim 8, wherein the inner pipe is moved so that a plurality of ejection positions coincide with other extra-tube spaces, and the injection solution passes through the outer pipe discharge ports through the separate inner pipe spaces. The ground pouring method according to claim 8, wherein the ground pouring method is poured into the ground. 2. The bag packer according to claim 1, wherein the bag packer is formed of a water permeable bag body, has a diameter of 1.2 to 5.0 times the hole diameter, and the length of the bag body is L, and between adjacent bag bodies. When the gap of A is assumed to be A ≦ 2L, when the bag packer is filled with the suspension and inflated to form the bag packer, the bag packer is packed with the bag packer because the bag body has a diameter larger than the hole diameter. The ground injection construction method according to claim 1, wherein the surrounding hole wall is consolidated, thereby forming a dense ground packer in which the injected solution is difficult to penetrate into the ground region around the bag packer.

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