JP2008231709A - Method and device for injecting into ground at multiple points - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a device for injecting into a ground at multiple points capable of eliminating the occurrence of disconnected parts in the ground and having high reliability. <P>SOLUTION: This device for injecting into a ground at multiple points comprises injecting pipes 1 for injecting a ground injection material into the ground at injection points; liquid feed pipes 4 for connecting the injection pipes to each other; unit pumps U1-U8 for feeding the ground injection material to the injection points through the liquid feed pipes and an injection material into the ground through the injection pipes; a flow passage selector valve 8 for changing the flow passages for the ground injection material at the injection points; a flow-pressure measuring devices 7 for measuring the flow and/or pressure of the ground injection material; a concentrated control device 6 for controlling the unit pumps and the flow-pressure measuring device; and an injection monitor for monitoring the injection state of the ground injection material at the injection points. Each unit pump has a power source. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a multipoint ground injection method and a multipoint ground injection device for efficiently injecting a ground injection material into a ground such as a soft ground, and for each ground mainly for a ground whose ground condition is different for each layer. It is possible to inject the optimum amount of ground injection material simultaneously or selectively, and to move the injection point (injection point) in the vertical and horizontal directions in the ground, making it possible to inject three-dimensionally, Furthermore, by arbitrarily controlling injection to multiple injection points by multiple injection pipes, it is possible to inject simultaneously so that groundwater is drained to multiple injection points, thereby osmotic injection into fine soil layers This improves the reliability, prevents the groundwater from being confined by the injection material, and prevents the occurrence of unmodified parts, and shortens the construction period by rapid construction.

  Usually, since the ground has different hydraulic conductivity and porosity for each layer, the ground condition naturally varies from layer to layer. For this reason, when injecting a chemical solution to this type of ground, conventionally, although not shown, the injection pipe is embedded in the ground alone or with a plurality of intervals, and the injection stage is moved upward through these injection pipes. Or it moved downward and the ground injection material was injected for every layer.

  By the way, the biggest problems in implementing chemical solution injection are to ensure that the injected material penetrates into a fine sand layer having a small water permeability coefficient, to uniformly infuse the injected material into the ground consisting of a plurality of soil layers having different ground properties, and The unimproved part due to the presence of the groundwater pocket storing the groundwater generated in the improved area caused partial leakage during excavation, which resulted in total destruction.

In general, the water permeability of the fine sand layer is usually k = 10 ⁻³ to 10 ⁻⁴ cm / sec. In order to inject a chemical solution to such a soil layer so as not to cause the destruction of the ground, an infiltration theory is used. In addition, low pressure injection must be performed at a low discharge rate of 1 to 10 liters or less per minute from one injection point.

  However, in the above-described known infusion method, one set of infusion pump is used for each infusion tube, and the economic reason for shortening the construction period as much as possible and the performance reason such as the capacity of the infusion pump, etc. Therefore, since the injection amount of the injection material must be about 10 to 20 liters per minute, the injection pressure may be increased and the ground may be destroyed. For this reason, the ground is raised or the fine soil layer is infiltrated and solidified. There was a problem that the knot was not performed sufficiently.

  Also, when injecting the injection material into the ground consisting of multiple soil layers with different ground properties, it is practically difficult to change the injection rate of the ground injection material according to the change of the soil layer, or to control the injection amount, For this reason, the injection material spreads in a large amount in a certain layer, and uneven injection occurs such that the injection material is slightly permeated in a certain layer, and there is a problem that continuity between adjacent consolidated bodies cannot be obtained.

  In order to solve such a problem, the present applicant has previously developed a ground injection method as disclosed in Patent Documents 1, 2, and 3, and has filed an application for this.

  In the injection method described in Patent Document 1, a plurality of injection pipes are installed in the ground, and when a ground improvement material is injected into the ground through the plurality of injection pipes, a large number of unit pumps are installed in one plant. The improvement material is pumped into each injection pipe and injected into the ground by a multi-unit pump that operates these multiple unit pumps simultaneously with a single drive source.

  In addition, as described above, the injection method described in Patent Document 2 makes use of the advantages of the multi-point simultaneous injection pump by the low-pressure osmotic injection, and each unit pump is independent depending on the injection situation of each injection pipe. By operating and managing collectively as a whole, it is possible to arbitrarily manage the injection speed, injection pressure, injection stop, restart, gelation time etc. of each unit pump according to the ground properties and injection conditions, and many By simultaneously managing the operation of the unit pumps and grasping and managing the whole injection situation, the disadvantage of the former known technique is improved by a method of injecting an injection material into a plurality of injection points simultaneously.

  And the ground injection method described in patent document 3 is a liquid feeding pipe and a reaction material injection material (B for feeding main material injection material (A liquid) to one injection pipe with respect to one injection point. 2 liquid supply pipes for supplying liquid) are connected, and both liquid A and liquid B supplied from the two liquid supply pipes are mixed in the injection pipe. A method of injecting into the ground so as to gel at the time of gelation, or using two injection pipes for one injection point, injecting an osmotic injection material or an injection material with poor permeability from one side, This is a method of injecting an injection material with good permeability from an injection tube.

JP-A-12-45259 Japanese Patent Laid-Open No. 2003-232020 Japanese Patent Laid-Open No. 9-291526

  However, in the injection method described in Patent Document 1, is it possible to inject a plurality of injection holes provided in the ground while driving one injection pump with one drive source and sequentially switching the injection points? Because multiple unit pumps that make up a multi-unit infusion pump are driven simultaneously, the ground conditions at each discharge port are different, so the optimal infusion conditions are different, so all of a set of unit pumps have the same conditions Therefore, there is a problem that optimal injection cannot be performed at each injection point.

  Also, if a trouble or failure such as clogging of one unit pump occurs, the entire set will not operate, and trouble and failure will occur more frequently as the number of unit pumps increases. There was a problem of reducing workability.

  On the other hand, in the injection method described in Patent Document 2, when simultaneously injecting ground injection material into dozens of injection points, dozens of unit pumps that operate independently are required. As a result, troubles frequently occur, and the size and weight increase, resulting in reduced workability.

  In addition, when the injection material is injected at multiple injection points at the same time, the groundwater in the ground is confined in the ground improvement area (groundwater pocket), and the penetration of the injection material into that area becomes impossible, and ground improvement is not possible. There was a problem of becoming sufficient.

  In particular, the injection method described in Patent Document 2 can inject injections for a number of injection points with a single unit pump, but if the number of injection points is increased, more unit pumps are required. That is, 60 unit pumps are required for simultaneous injection at 60 points, so that troubles are likely to occur frequently, and there is a problem that maintenance is troublesome and costs increase.

  In addition, although ground injection is based on replacing groundwater and injection material as the basis for ground improvement, if ground injection is performed simultaneously at multiple injection points, groundwater is contained by the injection material. Since there is a (groundwater pocket), especially in the case of the injection method shown in Patent Document 2, the portion where the infusion of the injected material is insufficient, that is, the unmodified portion is likely to occur. If injection is performed while selecting, there is a problem that a pump that is not used is generated and the apparatus is wasted.

  And the injection | pouring method described in patent document 3 is a main injection material (A liquid) from one of the two liquid feeding pipes connected to the said injection pipe in one injection pipe, and the other liquid feeding pipe. The reaction material injecting material (liquid B) is sent from each side, the liquid A and the liquid B are merged in the injection pipe, and injected into the ground so as to gel at a predetermined gelation time, or at one injection point. On the other hand, it is a method of injecting two types of injection materials from two injection tubes, and is not an injection method of injecting simultaneously into a plurality of injection points, but an injection method of injecting while switching at each injection point. There was a problem that it was not possible to significantly reduce the time.

  The present invention has been made to solve the above-described problems, and for the ground having different ground conditions for each layer, it is possible to simultaneously or selectively inject an optimum amount of ground injection material for each layer. In addition, by moving the injection stage in the vertical and horizontal directions, three-dimensional injection is also possible, and by controlling the injection to multiple injection points by multiple injection tubes, multiple injection points can be controlled. Improves the reliability of osmotic injection into fine soil layers by allowing simultaneous injection while draining groundwater, and prevents groundwater from being trapped by the injection material and generating unmodified parts (groundwater pockets). Furthermore, while there are few unit pumps installed to deliver ground injection material to each injection point, the multi-site can shorten the construction period by efficient ground injection and rapid construction. It is an object to provide an infusion method and multipoint ground implanter.

  The present invention enables simultaneous and continuous injection of ground injection material to a plurality of injection points by a plurality of injection pipes using a plurality of unit pumps, and is mainly developed to solve the following two problems. It has been done.

  One of the problems is that as the number of unit pumps installed increases, the weight of one multi-unit injection device increases, and the number of unit pumps installed is more likely to cause trouble. Maintenance man-hours increase and workability decreases.

  One of the remaining issues is that if ground injection material is injected simultaneously at multiple injection points, groundwater is surrounded by the injection material, making it difficult to drain, and as a result, groundwater is confined everywhere in the ground. So-called “groundwater pockets” are generated, and unmodified parts are formed, and a homogeneous ground improvement cannot be performed.

  The required number of unit pumps to be controlled by the batch management system is between 4 and 100, that is, 4-60 units practically for 4 injection points to 100 injection points. It is possible to replace the injection material while installing a pump and moving the injection region while continuously switching the flow path switching valve and pushing the groundwater in a certain direction.

  In order to solve the above-mentioned problems, the present invention provides a ground injection which is fed from a casting material storage tank to each injection point via a liquid feed pipe and fed by a unit pump and injected into the ground at each injection point via the injection pipe. The required amount of material is injected simultaneously or selectively into each injection point while appropriately switching the flow path of the injection material by a flow path switching valve connected to each injection point of the liquid feeding pipe.

  At that time, switching of the flow path of the injection material at each injection point can be continuously performed at a plurality of injection points so that the groundwater is pushed and drained in a certain direction by the injection material injected into the ground. it can.

  Further, a plurality of the unit pumps and the flow path switching valves described above are installed, and the operations of the unit pumps and the flow path switching valves can be collectively controlled by the central management device. As the flow path switching valve, there can be used one that is mechanically operated by an electromagnetic valve, fluid pressure, or the like, or one that is manually operated.

  For this reason, a large number of unit pumps, on the one hand, have the function of optimally injecting injection material into each injection point, while on the other hand, a set of injections that collectively manage injections at a large number of injection points as a whole The device is configured to allow simultaneous injection and simultaneous continuous injection to other injection points.

  In this invention, the space | interval of each injection | pouring point is about 0.5m-4.0m planarly, ie, the permeable consolidation diameter in one injection | pouring point is about 0.5m-4.0m. Moreover, it is about 0.3 m to 4.0 m in the longitudinal section, and one layer may be a consolidated layer depending on the case.

  As described above, according to the present invention, a plurality of unit pumps simultaneously inject an injection material into a plurality of injection points while managing the injection amount, injection pressure, and injection speed of the injection material. It is possible to inject continuously into multiple injection points via a valve, and also to grasp and manage the injection status at each injection point, and to detect the pressure at each unit pump and the pressure property at each injection point It is possible to select the injection point arbitrarily, and continuously inject while switching, but it is a small-scale injection device. And ground improvement can be performed efficiently and reliably.

  In addition, by the simultaneous continuous injection by the operation of the flow path switching valve, the injection material is injected at each injection point so that the ground water is pushed and drained in a certain direction by the injection material, so that the retained portion of the ground water (Groundwater pockets) can be eliminated and uniform ground improvement can be performed.

  Moreover, according to this invention, as shown in a specific example using a plastic gel, ground improvement can be performed by the massive solidified body by a plastic gel itself, pushing groundwater in a predetermined direction.

  For ground with different ground conditions for each layer, the optimum amount of ground injection material can be simultaneously or selectively applied to each layer, and the injection stage is moved appropriately in the vertical and / or lateral directions. It is also possible to inject vertically and laterally in the ground, and to control arbitrarily the injection to multiple injection points by multiple injection pipes. This can improve the reliability of infiltration into the fine soil layer and shorten the construction period by rapid construction.

  In addition, the direction of the replacement of the injected material with the groundwater is controlled two-dimensionally and three-dimensionally by simultaneously or selectively and continuously injecting a plurality of injection points in the horizontal direction or the vertical direction. Regardless of the injection, the formation of unmodified parts due to the storage of groundwater in the injection region can be prevented, and a reliable injection effect can be expected.

  Furthermore, by controlling the above using a centralized centralized control device, it is possible to effectively inject ground injection material into a large number of injection points using a small number of unit pumps, and the groundwater is confined by the injection material. This prevents the occurrence of unmodified parts, so-called “groundwater pockets”, and provides an injection effect with excellent workability. In addition, it is possible to cope with deformation and destruction associated with an increase in pore water pressure with respect to underground structures.

  This is because the injection points are arranged at equal intervals around the underground structure, the injection water is injected from multiple injection points at the same time, the pore water pressure is increased uniformly, and the flow path switching valve is continuously switched. Since the pore water pressure can be reduced evenly by moving the injection area to the outer periphery of the underground structure, the underground water pressure is not applied unevenly to the underground structure. It is difficult for objects to be destroyed or displaced.

  In addition, the ground injection material depends on the ground solid injection material for strengthening or stopping the ground such as soft ground, the solid waste injection material for industrial waste, etc. Plastic grout for creating a solidified solid and compressing and strengthening the surrounding ground, solidified material for forming a water blocking layer to prevent leakage of harmful substances from pollutants, and eliminating pollution of pollutants Injection chemicals containing chemical substances for heavy metals, or heavy metal fixing materials that chemically inactivate heavy metals, etc. can be used. In addition, a suspension-type injection material is also possible, whereby an arbitrary injection material can be selected according to the ground condition for each injection point.

  The ground injection method according to claim 1 is a multi-point ground injection method in which a ground injection material is injected into a plurality of injection points via a plurality of injection pipes having discharge ports, and the ground injection is injected into the ground at each injection point. A plurality of injection pipes for injecting the material, a plurality of liquid supply pipes for connecting the injection pipes to each other, and a ground injection material to be fed to each injection point via the liquid supply pipe A plurality of unit pumps for injecting injection material into the ground via the injection pipe, a plurality of flow path switching valves for switching the flow path of the ground injection material at each injection point, and the ground to be fed A unit pump using a multiple injection device comprising a flow rate / pressure measurement device for measuring the flow rate and / or pressure of an injection material, and a centralized control device for controlling the unit pump and the flow rate / pressure measurement device. Actuate The ground injection material is simultaneously and continuously injected into a plurality of injection points while switching the flow path of the ground injection material while controlling the knit pump and the flow rate / pressure measurement device by the central control device. It is.

  The ground injecting method according to claim 2 is the ground injecting method according to claim 1, wherein the flow of the ground injecting material is switched so that groundwater is pushed and drained by the ground injecting material injected into the ground. It is characterized by being performed at the injection point.

  The ground injection method according to claim 3 is the ground injection method according to claim 1 or 2, wherein the discharge ports of the plurality of injection pipes are installed at different injection points in the plane direction and / or different injection points in the vertical direction. It is characterized by this.

  The ground injection method according to claim 4 is the ground injection method according to any one of claims 1 to 3, wherein a flow rate / pressure measuring device is connected to the liquid feeding pipe, and the ground is measured by the flow rate / pressure measuring device. A flow rate and / or pressure data signal of the injection material is transmitted to the central control device, and the ground injection material is injected into a plurality of injection points based on the information.

  The ground injection construction method according to claim 5 is the ground injection construction method according to any one of claims 1 to 4, wherein an injection monitoring board is connected to the central control device, and the injection monitoring board is measured by a flow rate / pressure measuring device. The ground injection material flow rate and / or pressure data signals are displayed on the screen, and the injection status of the ground injection material is collectively monitored, so that the injection pressure and / or flow rate at each injection point is within a predetermined range. While maintaining the injection, the injection is completed, stopped, continued, or the flow path switching valve is operated based on the information of the data.

  The ground injection device according to claim 6 is a multi-point ground injection device for injecting a ground injection material into a plurality of injection points via a plurality of injection pipes having discharge ports, and injecting the ground into the ground at each injection point. A plurality of injection pipes for injecting the material, a plurality of liquid supply pipes for connecting the injection pipes to each other, and a ground injection material to be fed to each injection point via the liquid supply pipe A plurality of unit pumps for injecting an injection material into the ground via the injection pipe, a plurality of flow path switching valves for switching the flow path of the ground injection material at each injection point, and the ground injection material A flow rate / pressure measurement device for measuring the flow rate and / or pressure, a centralized control device for controlling the unit pump and the flow rate / pressure measurement device, and monitoring the injection status of the ground injection material at each injection point Injection monitoring equipment Wherein the unit pump is to characterized in that it comprises individually powered.

  The ground injection method according to claim 7 is the ground injection device according to claim 6, wherein each unit pump is controlled based on the flow rate and / or pressure data signal of the ground injection material transmitted from the central control device. In addition, a speed change mechanism for adjusting the flow rate and / or pressure of the ground injection material fed to each injection point is provided.

  The present invention injects the required amount of ground injection material injected through the injection pipe into the ground at each injection point simultaneously or selectively at each injection point while switching the flow path of the injection material with a path switching valve. Therefore, it is possible to prevent the occurrence of so-called “groundwater pockets” by injecting the injection material so that the underground water is pushed in a certain direction and drained by the injection material injected into the ground. Thus, the entire ground can be improved uniformly.

  A plurality of unit pumps simultaneously inject the injection material into a plurality of injection points while controlling the injection amount, injection pressure, and injection speed of the injection material, and at least one unit pump switches a plurality of flow paths. Since it is possible to inject continuously into multiple injection points via a valve, and to understand and manage the injection status at each injection point, it is possible to detect the pressure at each unit pump and the pressure characteristics at each injection point Because the injection point can be selected arbitrarily and the flow path of the injection material can be arbitrarily switched, a large-capacity soil can be rapidly injected with a large amount of injection in one set even though it is a small-scale injection device. Injection is possible, construction time is shortened, and the ground can be improved efficiently and reliably.

  FIG. 1 is a conceptual diagram showing an example of the multipoint ground injection apparatus of the present invention. In the figure, reference numeral 1 denotes an injection pipe installed at each injection point (injection point) of the ground into which the ground injection material is injected.

  As shown in the drawing, each injection tube 1 has, for example, a horizontal axis X1 when a lattice frame composed of a plurality of horizontal axes X1, X2, X3,... And vertical axes Y1, Y2, Y3,. , X2, X3,... And vertical axes Y1, Y2, Y3,.

  The injection tube 1 has a single tube structure or double tube structure with a ground injection material discharge port at the tip, or a double packer or multi-packer (3 pieces) on an outer tube having one or more discharge ports. A double-pipe structure constructed by inserting an inner pipe provided with the above packer), or a bundle of a plurality of thin tubes having discharge ports at different positions in the axial direction, or the outer pipe A plurality of bag packers and a plurality of discharge ports provided between the bag packers in the axial direction can be used.

  For example, in order to inject an injection material into the ground using the injection tube 1 provided with a plurality of bag packers and discharge ports in the outer pipe, the bag packer is solidified in the bag packer in the ground such as mortar. Then, the ground injection material is supplied into the injection pipe 1 from the ground.

  Then, the ground injection material is discharged into the ground from the discharge port of the injection tube 1, and the ground strength is increased by forming a columnar or spherical solid body around the injection tube 1 to expand and compress the surrounding ground. Enhanced.

  In addition, by injecting the injection material into multiple injection points at the same time in consideration of the drainage direction of the groundwater, the groundwater is pushed in a certain direction by the consolidated body of the injection material. It can be drained by pushing in a certain direction.

  The injection method is not particularly limited, and for example, an infusion method in which the injection material is uniformly permeated into the ground and the entire ground is uniformly consolidated may be employed.

  The interval between adjacent injection pipes 1 and 1 provided at a plurality of injection points is appropriately set in a range of about 0.5 m to 4.0 m according to the properties of the ground.

  Reference numeral 2 denotes an injection material storage tank in which a ground injection material to be injected into the ground at each injection point is stored, and reference numerals 3 and 4 denote liquid injection of the ground injection material from the injection material storage tank 2 to the injection pipe 1 at each injection point. The liquid supply pipe 3 is installed between the injection points along the Y-axis direction, and the liquid supply pipe 4 is installed between the injection points along the X-axis direction. Therefore, the liquid feeding pipe 3 and the liquid feeding pipe 4 are arranged in a lattice pattern in the X-axis direction and the Y-axis direction.

  Reference numerals U1 to 8 indicate that the ground injection material is supplied from the injection material storage 2 to each injection point through the liquid supply pipe 3 and the liquid supply pipe 4, and the ground is provided through the injection pipe 1 in the ground of each injection point. A unit pump 5 for injecting an injection material is a power source for driving the unit pumps U1 to U8.

  Each of the unit pumps U1 to U8 is provided with a power source 5 and is controlled by a controller 6a of a centralized management device 6 described later to feed a required amount of ground injection material to each injection point and through the injection pipe 1 It is connected to the liquid feeding pipe 3 so that a required amount of ground injection material can be injected into the ground at each injection point.

  Reference numeral 7 denotes a flow rate / pressure measuring device connected to each liquid feeding pipe 3 for measuring the injection amount and injection pressure at the time of injection of the ground injection material at each injection point. It is controlled by a controller 6b of the centralized management device 6 described later, and is connected to the liquid feeding pipe 3 so that the injection amount, injection pressure and injection speed of the ground injection material injected into the ground at each injection point can be measured in real time. .

  The unit pumps U1 to 8, the power source 5 that drives the unit pumps U1 to U8, and the flow rate / pressure measuring device 7 are combined to form one system (one set) of injection devices, and a plurality of systems are arranged. In addition, the system is connected to the injection material storage tank 2 and the injection pipes 1 at the respective injection points through the liquid feeding pipes 3 and 4.

  Therefore, even if trouble occurs in some unit pumps during the injection of the injection material and the operation becomes impossible, the injection material can be continuously fed from other injection systems.

  Reference numeral 8 denotes a flow path switching valve for switching the flow path of the ground injection material fed from the injection material storage tank 2 to each injection point by the liquid supply pipe 3 or the liquid supply pipe 4 at each injection point. The path switching valve 8 is connected to a connection portion between the liquid feeding pipe 3 and the liquid feeding pipe 4 at each injection point.

  The ground injection material fed from the injection material storage tank 2 to each injection point is switched in flow path by the flow path switching valve 8, for example, through the injection pipe 1 connected to the flow path switching valve 8. The liquid is injected into the liquid or supplied to another injection point via the liquid supply pipe 3 or 4.

  Further, the flow path switching valve 8 at each injection point is controlled by a controller 6c of the centralized management device 6 described later so that the flow path of the injection material can be freely switched for each injection point or for each of a plurality of injection points. It has become.

  Reference numeral 6 denotes a centralized management device for centrally controlling the unit pumps U1 to 8, the power source 5, the flow rate / pressure measuring device 7 and the flow path switching valve 8, and each unit pump U1 to 8 and its power A controller 7 a for controlling the source 5, a controller 6 b for controlling each pressure / flow rate measuring device 7, and a controller 6 c for controlling each flow path switching valve 8 are provided.

  For example, when the controller 6b obtains information on the flow rate and / or pressure of the injection material at the injection point transmitted from the flow rate / pressure measurement device 7 at the injection point, the controller 6b sets the predetermined pressure range at the injection point. Then, the unit pump U and the power source 5 are controlled so that the injection material is fed within the range of the injection speed (the rotational speed is changed by a rotation irregular mechanism, etc.).

  When the injection amount of the injection material at the injection point reaches a predetermined amount, information to that effect is transmitted to the controller 6c, and then the controller 6c operates the flow path switching valve 8 at the injection point to move to the next injection point. Information is transmitted to the controller 6b so that the injection solution is fed into the injection tube. By such control, a necessary amount of the injection material can be continuously and simultaneously sent from the injection material storage tank 2 to each injection point or a plurality of injection points.

  Reference numeral 9 denotes a monitoring panel for monitoring the injection point of the injection material, the injection state of the injection material at each injection point, and the liquid supply state of the injection material to each injection point, and is connected to the central control device 6. ing. The monitoring panel 9 displays the actual injection points and the arrangement of the liquid supply pipes 3 and the liquid supply pipes 4 between the injection points by a liquid crystal display method or the like.

  Through the monitoring board 9, the injection material injection point, the injection state of the injection material at each injection point, and the flow path of the injection material to each injection point can be confirmed by human eyes. Furthermore, while looking at the monitoring board 9, the injection point, the flow path of the injection material to the injection point, etc. can be freely set and changed.

  In such a configuration, the injection material sent from the injection material storage tank 2 to each injection point via the liquid supply pipes 3 and 4 is a unit controlled by the controller 6a via the injection pipe 1 for each injection point. It inject | pours in the ground of each injection | pouring point with the pumps U1-8.

  At that time, an optimal injection amount and / or injection pressure is set for each injection point by the flow rate / pressure measuring device 7 controlled by the controller 6b, and an optimal amount of injection material is injected according to the ground properties at each injection point. Is done.

  Further, the flow path switching valve 8 at each injection point is controlled by the controller 6b and is operated for each injection tube 1 or for each of the plurality of injection tubes 1 so that the injection material is for each injection point or for each of the plurality of injection points. Is injected into the ground through the injection tube 1.

  Further, the injection amount, injection pressure, and injection speed of the injection material at each injection point are measured by the flow rate / pressure measurement device 7, and the information is transmitted to the controller 6 in real time.

  In the multipoint ground injection device shown in FIG. 1, eight unit pumps U1 to U8 are arranged, each having a power source 5 individually, and each having a liquid feeding pipe 3 and a liquid feeding pipe 4. Via the injection material storage tank 2 and the injection pipe 1 at each injection point. In addition, eight injection pipes 1 are connected to each liquid supply pipe 3 arranged along each of the Y1 to 8 axes via a flow path switching valve 8. Therefore, since 8 unit pumps U1 to 8 allow a total of 8 × 8 = 64 injection pipes 1 to allow simultaneous and continuous injection of the injection material under the collective management by the centralized control device 6, the weight of the device is reduced. And workability can be dramatically improved.

  Further, by continuously operating the flow path switching valve 8 at each injection point, selective and continuous liquid feeding to an arbitrary injection pipe 1 on each Y-axis becomes possible, whereby groundwater is supplied in a predetermined direction. While draining, the injection material can be injected to replace the groundwater between the soil particles with the injection material.

  Further, a plurality of liquid feeding pipes 3 in each Y-axis direction and liquid feeding pipes 4 in each X-axis direction are arranged in a planar lattice shape, and an injection pipe 1 is provided at each intersection of the liquid feeding pipe 3 and the liquid feeding pipe 4. By installing it, the injection pipe 1 can be selected, drainage to the groundwater corresponding to the ground or taking into account the existence of underground structures is also possible, and the precise ground improvement can be performed. it can.

  Further, the liquid supply pipe circuit as described above is provided as a liquid supply circuit board at any position from each injection pipe 1 to the unit pumps U1 to 8 as a part constituting the injection apparatus, and each injection pipe from the intersection of the circuit boards. A compact injection device can be constructed by connecting the liquid feeding pipes.

  Next, based on FIG. 2, while draining the groundwater in the ground from the X8 axis side to the X1 axis direction (on the drawing, from the upper side to the lower side), an example of the construction procedure of the multipoint ground injection method of the present invention is performed. The case where it performs is demonstrated.

  First, the flow path switching valve 8 connected to each intersection (injection point) of the liquid feeding pipe 3 on the Y1 to Y8 axes and the liquid feeding pipe 4 on the X8 axes connected to the unit pumps U1 to U8, respectively. Is opened only on the injection pipe 1 side and each unit pump U1-8 side of each injection point on the X8 axis. And each unit pump U1-U8 is operated and an injection material is inject | poured through the injection pipe 1 to each injection | pouring point on X8 axis | shaft.

  Next, each flow path switching valve 8 connected to each intersection (injection point) between each liquid feeding pipe 3 on the Y1 to Y8 axes and each liquid feeding pipe 4 on the X8 axes, and each on the Y1 to Y8 axes Each flow path switching valve 8 connected to each intersection (injection point) of the liquid supply pipe 3 and the liquid supply pipe 4 on the X7 axis is connected to each injection pipe 1 side on the X7 axis and each unit pump U1-8 side. Open only. And each unit pump U1-8 is operated and an injection material is inject | poured into each injection | pouring point on X7 axis | shaft.

  Hereinafter, similarly, each flow path switching valve 8 connected to each intersection (injection point) between each liquid feeding pipe 3 on the Y1 to Y8 axes and each liquid feeding pipe 4 on the X6 to X1 axes is connected to the X1 axis. The injection material is injected into each injection point while sequentially switching in the direction.

  By injecting the ground injection material in this way, groundwater in the ground is drained in the X1 axis direction while being pushed from the X8 axis side to the X1 axis side by the injection material injected at each injection point (thick arrow in the figure) direction).

  Next, based on FIG. 3 and FIG. 4, the other construction procedure of the multipoint ground injection method of the present invention is to drain the groundwater in the ground from the Y4 axis in both directions (in the drawing, the left and right direction of the Y4 axis). However, the case where it carries out is demonstrated.

  First, each flow path switching valve 8 connected to each injection point on the Y4 axis is opened only on the side of each injection pipe 1 on the Y4 axis. Moreover, each unit pump U1-U8 and the injection pipe 1 of each injection point on the Y4 axis are connected by the shortest liquid supply pipe 3 and liquid supply pipe 4, respectively. For example, unit pumps U1 to 8 and injection point P1 such as unit pump U1 and injection pipe 1 at injection point P5, unit pump U2 and injection pipe 1 at injection point P6, unit pump U3 and injection pipe 1 at injection point P7, and so on. The injection pipes 1 to P8 are connected to each other. In this case, the connection is completed only by opening the flow path switching valve 8 at each injection point, which is the shortest flow path between each unit pump U and the injection point P, only in the two directions.

  And by operating each unit pump U1-U8, an injection material can be simultaneously injected into eight injection | pouring points on a Y4 axis | shaft. In addition, the line shown with the thick line in FIG. 3 shows the injection material flow path between the injection tube 1 and the unit pump at each injection point.

  Thus, when the injection of the injection material is completed at each injection point on the Y4 axis, the injection material is injected while sequentially switching the injection point in the Y3 axis to Y1 axis direction on the left side of the Y4 axis in the drawing, and the left side of the Y4 axis is injected. When the injection at each injection point is completed, the ground injection is then performed at the injection point on each Y axis while sequentially switching the injection point from the Y4 axis to the Y5 axis to the Y8 axis on the right side.

  For example, in order to inject an injection material to each injection point on the Y3 axis, first, each flow path switching valve 8 connected to each injection point on the Y3 axis is opened only to each injection tube 1 side on the Y3 axis. . Moreover, each unit pump U1-8 and each injection | pouring point on the Y3 axis are connected by the shortest liquid feeding pipe 3 and the liquid feeding pipe 4, respectively. That is, the unit pumps U1 to 8 and the injection point P1 such as the unit pump U1 and the injection pipe 1 at the injection point P6, the unit pump U2 and the injection pipe 1 at the injection point P7, and the unit pump U3 and the injection pipe 1 at the injection point P8. -P8 injection pipes 1 are respectively connected (see FIG. 4). In this case, the connection is completed only by opening the flow path switching valve 8 at each injection point, which is the shortest flow path between each unit pump U and each injection point P, only in the two directions.

  And by operating each unit pump U1-U8, an injection material can be simultaneously injected into eight injection | pouring points on a Y3 axis | shaft.

  By performing the ground injection in this way, the groundwater is pushed and drained by the injection material in the left direction and the right direction of the Y4 axis. In the figure, the arrows indicate the direction of groundwater drainage.

  FIG. 5 shows an injection method for injecting a ground injection material into the surrounding ground of an underground structure such as a foundation pile, and an injection point is set on the surrounding ground of the underground structure 10. The injection pipe 1 is buried in the ground at the injection point to inject the injection material. The injection point in this case is determined by appropriately considering the properties of the ground and the position of groundwater. Therefore, the installation intervals of the injection tube 1 do not necessarily have to be equal.

  When the installation of the injection pipe 1 is completed, the unit pumps U1 to U8 are operated to send the injection material from the injection material storage tank 2 to each injection point. Then, an injection material is injected into the ground at each injection point through each injection tube 1. In this case, the injection material is sequentially injected into each injection point so that the groundwater is pushed outward from the underground structure 10 side by the injection material. That is, ground injection is performed while moving the injection point outward from the underground structure 10 side.

  By the simultaneous continuous injection of the injection material, the groundwater is displaced outward as indicated by an arrow, that is, outward of the underground structure 10, and is replaced with the injection material to widen the consolidated region. As a result, the increase in the heterogeneous pore water pressure does not cause deformation or destruction of the underground structure due to the inhomogeneous pressure action, and the pressure applied to the underground structure due to the movement of groundwater to the outside by simultaneous continuous injection. Is reduced evenly and the destruction and displacement of underground structures are prevented.

  Further, even when the injection material is a plastic gel, since the increase in the pore water pressure of the groundwater is small, a large consolidated body is formed, and the density of sand around the consolidated body is increased uniformly. There is an advantage that uneven loads do not act on the intermediate structure.

  The present invention can arbitrarily control injection from a plurality of injection pipes and can simultaneously and continuously inject into a plurality of injection points through a plurality of injection pipes. The reliability is improved, the danger of deformation and destruction due to the increase of pore water pressure to the underground structure is prevented, and the injection construction period is shortened by rapid construction with a small-scale injection device.

It is a conceptual diagram which shows the multipoint ground injection apparatus of this invention. It is a conceptual diagram which shows an example of the injection method of a ground injection material. It is a conceptual diagram which shows an example of the injection method of a ground injection material. It is a conceptual diagram which shows an example of the injection method of a ground injection material. It is a conceptual diagram which shows the method of inject | pouring a ground injection material in the surrounding ground of an underground structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Injection pipe 2 Injection material storage tank 3 Liquid supply pipe 4 Liquid supply pipe 5 Power source of unit pump 6 Centralized control device 7 Flow rate / pressure measuring device 8 Flow path switching valve 9 Monitoring panel 10 Underground structure U1-U8 Unit pump P injection point (point)

Claims (7)

  A multi-point ground injection method in which ground injection material is injected into a plurality of injection points via a plurality of injection tubes having discharge ports, and a plurality of injection tubes for injecting the ground injection material into the ground at each injection point And a plurality of liquid feeding pipes for connecting the injection pipes to each other, and the ground injection material is fed to the injection points via the liquid feeding pipes and into the ground via the injection pipes. Multiple unit pumps for injecting the injection material, multiple flow path switching valves for switching the flow path of the ground injection material at each injection point, and measuring the flow rate and / or pressure of the ground injection material to be fed Using a multiple injection device comprising a centralized control device for controlling the flow rate / pressure measurement device and the unit pump, the flow path switching valve and the flow rate / pressure measurement device, and operating the unit pump, Unit Pong Multi-point ground, wherein the ground injection material is simultaneously and continuously injected into a plurality of injection points while switching the flow path of the ground injection material while controlling the flow rate / pressure measuring device by the central control device Injection method.   2. The multipoint ground injection method according to claim 1, wherein the flow path switching of the ground injection material is performed at a plurality of injection points such that groundwater is pushed and drained by the ground injection material injected into the ground. .   The multipoint ground injection method according to claim 1 or 2, wherein discharge ports of the plurality of injection pipes are installed at different injection points in the plane direction and / or different injection points in the vertical direction.   A flow rate / pressure measuring device is connected to the liquid feeding pipe, and a flow rate and / or pressure data signal of the ground injection material measured by the flow rate / pressure measuring device is transmitted to the central control device, and a plurality of based on the information The multipoint ground injection method according to any one of claims 1 to 3, wherein the ground injection material is injected at an injection point while switching a flow path of the ground injection material with a flow path switching valve.   An injection monitoring board is connected to the central control device, and the flow rate and / or pressure data signals of the ground injection material measured by the flow rate / pressure measuring device are displayed on the screen to indicate the injection status of the ground injection material. By performing collective monitoring, injection is performed while maintaining the injection volume and / or injection pressure at each injection point within a predetermined range, and injection is completed, stopped, continued, or the channel is switched based on the information of the above data. The multipoint ground injection method according to claim 4, wherein the valve is operated.   A multi-point ground injection device for injecting a ground injection material into a plurality of injection points via a plurality of injection pipes having discharge ports, a plurality of ground injection materials for injecting the ground injection material into the ground at each injection point An injection pipe, a plurality of liquid supply pipes for connecting the injection pipes to each other, and a ground injection material to be supplied to each injection point via the liquid supply pipe, and the ground via the injection pipe Multiple unit pumps for injecting ground injection material into the interior, multiple flow path switching valves for switching the flow path of ground injection material at each injection point, and measuring the flow rate and / or pressure of the ground injection material A flow rate / pressure measurement device, a centralized control device for controlling the unit pump and the flow rate / pressure measurement device, and an injection monitoring device for monitoring the injection state of the ground injection material at each injection point To be Multipoint ground injection apparatus according to symptoms. Each unit pump is controlled based on the ground injection material flow rate and / or pressure data signal sent from the central control device and adjusts the ground injection material flow rate and / or pressure sent to each injection point. The multi-point ground injection device according to claim 6, further comprising a transmission mechanism for performing the operation.

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