JP4737332B2 - Ground improvement method and ground improvement equipment - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a ground improvement method and a ground improvement device, which prevents the injection material from being missed and allows the injection material to be uniformly and reliably injected into the target ground to easily form a large-diameter consolidated body. Can do.

  Ground improvement by the injection method is a method of strengthening the ground by injecting cement-based solidification material and water glass-based chemicals into the ground using an injection pipe installed in the drilling hole. The purpose is to improve, increase the strength, and fill the cavity.

  The injection tube used in the injection method includes, for example, an injection outer tube 20 installed in a drilling hole formed in the ground as shown in FIGS. 13 (a) and 13 (b), and this injection outer tube. 20 and an injection inner tube 21 installed in the inside.

  The injection outer tube 20 includes a plurality of injection material discharge ports 20a formed at intervals in the tube axis direction, and outer tube packers 22 and 22 attached on both upper and lower sides of the injection material discharge port 20a. It has. The injection inner tube 21 includes an injection material discharge port 21a at the tip and inner tube packers 23, 23 on both upper and lower sides of the injection material discharge port 21a.

  The outer tube packer 22 is formed to have a diameter larger than the inner diameter of the drilling hole I by filling the bag body with a cement-based solidifying material and the like, and the gap (columnar space) between the drilling hole I and the outer injection tube 20 is discharged. By closing on both the upper and lower sides of the outlet 20a, a columnar injection material permeation source B that is continuous in the tube axis direction is formed between the drill hole A and the injection outer pipe 20, and between the hole A and the injection outer pipe 20 It functions to prevent the injection material from escaping through the gap in the tube axis direction.

  The inner tube packer 23 expands by filling with air or fluid and closes the gap between the injection outer tube 20 and the injection inner tube 21 on both upper and lower sides of the injection material discharge ports 20a and 21a, thereby injecting the injection outer tube 20 and the injection tube. It functions to form an injection material flow path from the injection inner tube 21 to the injection material permeation source B between the inner tube 21 and the inner tube 21.

  In such a configuration, the injection outer tube 20 is set up in the drilling hole A, then the injection inner tube 21 is set up in the injection outer tube 20, and the injection material discharge port 21a of the injection inner tube 21 is connected to the outer tube packer. It matches with the position of 22 injection material injection port 22a.

  Then, a fluid or liquid is injected into the inner tube packer 23 to expand the inner tube packer 23, and between the injection outer tube 20 and the injection inner tube 21 on both upper and lower sides of the injection material discharge port 21a of the injection inner tube 21. Seal.

  Next, a cement-based solidified material is injected into the outer tube packer 22 by the injection inner tube 21 and the outer tube packer 22 is expanded, so that the gap between the drilling hole I and the injection outer tube 20 is set above and below the injection material discharge port 22a. Seal on both sides.

  By doing so, it is possible to form a columnar injection material permeation source B continuous between the upper and lower outer tube packers 22 in the tube axis direction.

  Next, the injection inner tube 21 is set up in the injection outer tube 20, and the inner tube packers 23, 23 are placed at positions where the injection material discharge port 20 a of the injection outer tube 20 and the injection material discharge port 21 a of the injection inner tube 21 coincide. By expanding, the gap between the outer injection tube 20 and the inner injection tube 21 is sealed on both upper and lower sides of the injection material discharge ports 20a and 21a.

  Then, the injection material is pumped into the injection inner tube 21. Then, the injection material is discharged between the inner tube packers 23 and 23 between the injection outer tube 20 and the injection inner tube 21 from the injection material discharge port 21a. Further, it is discharged from there through the injection material discharge port 20a of the injection outer tube 20 to the injection material infiltration source B, and from there, it is injected into the surrounding ground (infiltration between soil particles).

  At that time, by changing the injection stage by moving the injection inner tube 21 in the vertical direction in the injection outer tube 20, it is possible to perform appropriate injection according to the properties of the soil layer in each injection stage.

  Further, since a long columnar permeation source B can be formed between the outer tube packers 22 and 22, the permeation can be performed with a small injection pressure even if the injection is performed at a large discharge amount per stage, so that the large diameter A consolidated body can be formed.

  By the way, one ideal in the injection method is in the inter-soil particle infiltration (penetration injection) in which the injection material is evenly immersed between the soil particles, and it is close to the ideal by taking as much time as possible and performing by low pressure injection. Infiltration between soil particles is possible.

  In addition, in the injection method, it is necessary to ensure that the injected material penetrates into a fine sand layer having a small hydraulic conductivity, and for the ground consisting of a plurality of soil layers having different ground properties, the injected material should be uniformly and reliably supplied. Need to penetrate.

  Further, in the case of ground including a rough soil layer, even if a long columnar injection material penetration source B is provided between the outer tube packers 22 and 22, penetration with a long gel time discharged into the injection material penetration source B. It is required that the excellent injection material does not escape to the outside of the injection range through the coarse layer, or does not get over the outer tube packer 22 and flow into the upper and lower columnar spaces. Further, it is required that the long injection material permeation source B is not blocked by the collapse of the hole wall and the injection material discharge port of the injection outer tube is not clogged.

JP 2002-167745 A Japanese Patent Laying-Open No. 2005-307508 JP-A-7-279156

  However, many grounds are composed of irregularly laminated layers with different hydraulic conductivity and porosity, especially sandy and gravel layers, where both the hydraulic conductivity and porosity are large. Therefore, both the hydraulic conductivity and porosity of the viscous soil layer and silt layer are small.

  Even if the ground is improved by the injection method for such ground, the injected material is often not evenly injected throughout the ground, especially in the ground including sandy and gravel layers. The injected material runs away, so that a lot of the injected material is wasted, and it is very difficult to uniformly infuse and inject the injected material over the entire ground.

  In addition, when injecting the injection material into the ground consisting of multiple formations with different ground properties, it is practically difficult to control the injection speed and the injection amount in accordance with the change of the formation, and for this reason, the injection material is in a certain layer. It was very difficult to spread the injection material uniformly throughout the ground due to the unevenness of the injection that spread in a large amount and only slightly penetrated in a certain layer.

  Further, in the case of the ground including a rough soil layer, even if a long columnar injection material penetration source B is provided between the outer tube packers 22 and 22, the gelation time discharged into the injection material penetration source B is long. It is required that the injection material having excellent permeability does not escape outside the injection target range and does not get over the outer tube packer 22 and flow into the upper and lower columnar spaces.

  In order to prevent the injection material having good permeability from getting over the outer tube packer 22, the outer tube packer 22 may be lengthened in the tube axis direction. If the injection material permeation source b is shortened, it is necessary to reduce the discharge amount per minute in order to infiltrate the injection material between the soil particles under a low pressure. There was a problem that the diameter was reduced, the injection time was increased, and the construction efficiency was lowered.

  For this reason, when the discharge amount per minute is increased, the injection material permeation source B is short, so that there is a problem that the injection pressure increases and pulse injection is caused. Further, if the diameter of the solidified body is small, it is necessary to narrow the injection interval, so that the number of drill holes i is increased and there is an economical problem.

  However, in order to form a large-diameter solidified body, an infusion solution with a long gel time must be continuously infused for a long time, and the infusion solution leaks to the ground surface near the ground surface with a small restraint pressure. There is a problem that uniform injection cannot be performed over a wide range in the injection stage.

  Moreover, in order to lengthen the columnar penetration source, the length of the outer tube packer has to be shortened, and if it is shortened, there is a problem that the columnar space of the next injection stage is filled by overcoming the outer tube packer.

  In addition, the injection method takes as much time as possible and is ideally done by low-pressure injection because it allows the injected material to penetrate evenly between the particles, so it takes considerable time and effort, The current situation is not ideal in terms of construction efficiency.

  For this purpose, it is desirable to use a large columnar penetration source to inject a low pressure with a large discharge amount.However, as the injection material penetration source becomes longer, the drilling wall collapses and the discharge port becomes clogged. The opening ratio of the injection tube with respect to (space) becomes small, and the injection material does not spread over the entire length of the injection material permeation source.

  For this reason, there has been a problem that an injection tube device is required which prevents collapse of the hole wall and maintains the columnar space of the injection material permeation source and at the same time has a high aperture ratio with respect to the entire length of the columnar space.

  The present invention has been made to solve the above-described problems, and prevents the infusion material from running away and maintains a long columnar space so that the infusion material is not wasted in the target ground and is infiltrated between soil particles at a low pressure. Provided is a ground improvement device and a ground improvement method capable of easily forming a large-diameter solidified body by injecting uniformly and surely.

The ground improvement device according to claim 1 (FIGS. 1 to 5) includes an injection outer tube installed in a drilling hole and an injection inner tube installed in the injection outer tube, and the injection outer tube is the injection across the discharge port and the discharge port of the suspendable injection material or Madokayui infusion material communicating with the space of the outer tube and the drilling walls suspended consisting of the plurality of outer tube packer attached to both upper and lower sides A turbid injection material or an instantaneous injection material injection portion, and a permeable injection material injection portion having a plurality of permeable injection material discharge ports provided in the injection outer tube, wherein the upper and lower outer tube packers are suspended. A water-permeable columnar bag made of linen, woven fabric, non-woven fabric, water-permeable synthetic resin or netting material that can permeate fine particles of turbidity injection material or gel of quick setting injection material and filled in the columnar bag body. formed from a suspension of the injection material or Madokayui infusion material, and on the spacing between the upper and lower outer tube packer It is formed at an interval 1/2 narrower than the length in the tube axis direction of the outer tube packer, and the suspending injection material or the instantaneous setting injection material in the upper and lower outer tube packers is columnar on the injection inner tube and the injection outer tube. Through the injection material discharge port formed in communication with the bag body, the fine particles of the suspension injection material or the gel of the instantaneous setting injection material permeate the columnar bag body and surround the outer tube packer around the outer tube packer. It is filled with the soil around the packer so as to form a soil packer, and is further suspended around the soil packer via a discharge port between the injection inner pipe and the upper and lower packers, The injectable material is injected so as to solidify together with the soil around the soil packer to form a large-diameter soil packer .

  The present invention forms a large-diameter soil packer near the ground surface around the outer pipe or near a highly permeable soil layer, so that the permeability injected later below the large-diameter soil packer. The injection material is prevented from escaping around the outer injection pipe to the ground surface side, or the permeable injection material is prevented from escaping out of the injection range from a highly permeable soil layer. .

  In addition, by securing a columnar injection source that is long in the tube axis direction below the large-diameter soil packer, the drilling interval is increased, and large-diameter solids are obtained by intersoil particle infiltration (penetration injection) at a large discharge rate and low pressure. A structure (ground improvement body) can be easily and reliably formed.

According to the present invention, a suspending injectable material or an instantaneous flashing material is formed on a water-permeable columnar bag made of a woven fabric, a non-woven fabric, or a net material that can permeate the fine particles of the suspending injectable material or the gel of the instantaneous injecting material. An outer tube packer having a diameter larger than the hole diameter is formed by filling a caustic injection material (hereinafter referred to as “coarse filling material”), for example, a cement-based solidified material, and a columnar bag is formed around the outer tube packer. Filled fine particles of suspension infusion or gel of quick setting infusion penetrates the bag and solidifies with the soil around the outer tube packer to form a large soil packer, further suspendability By injecting the coarse filling material into the ground around the soil packer from the discharge port of the injection material or the instantaneous setting injection material (hereinafter referred to as “rough filling injection material discharge port”), to further form a larger diameter soil packer comprising, injecting out as a result It can form a considerable soil packer near the ground surface around.

  At that time, the distance between the upper and lower outer tube packers is set to be narrower than the length in the tube axis direction of the outer tube packer, so that the upper and lower outer tube packers and the drilling wall where the coarsely filled injection material discharge port is located A part of the solidified material (fine-grained portion or gel of quick-setting injectable material) that has permeated through the columnar bag in the space surrounded by the outer outer tube and the upper surface of the lower outer tube packer. The hole wall protector can be formed by flowing in and solidifying in the space.

  The perforated wall protector does not contain soil, and only the fine-grained portion of the solidified material or the gel of the quick-setting injectable material is solidified, so that the strength is higher than the soiled packer or the solidified product of the suspension itself. Therefore, it is easily crushed by the injection pressure when the coarsely packed injection material is injected from the coarsely packed injection material discharge port.

  Therefore, the coarse filling material is injected into the ground outside from the upper and lower soil packers, and a larger soil packer is formed.

  Therefore, it is possible to prevent collapse of the hole wall where the coarsely filled injection material discharge port of the outer pipe is opened, and the coarse injection material discharge port is clogged due to slime in the drilling hole or collapse of the hole wall. Therefore, a necessary amount of the coarse filling material injection material can be reliably injected into the surrounding ground.

  Normally, when an outer tube packer is formed by injecting a solidified material into a columnar bag provided close to a coarsely packed injection material discharge port, the surrounding soil is pushed away by the expansion of the bag, and the soil is removed. However, there is a problem that the coarse filling injection material discharge port is blocked by entering the space in contact with the rough filling injection material discharge port, and subsequent injection of the rough filling injection material is difficult.

  According to the present invention, the hole wall protector is formed of a part of the solidified material (fine-grained portion or gel of quick-setting injectable material) that has permeated through the columnar bag body in the hole between the upper and lower outer tube packers. Therefore, the above problem does not occur.

  In this case, the distance L1 between the upper and lower outer tube packers is desirably ½ or less of the length L3 of the outer tube packer in the tube axis direction (see FIG. 9). As the columnar bag, a bag made of a material having a water-permeable function such as linen, woven fabric, non-woven fabric, water-permeable synthetic resin, and netting material is suitable.

  In addition, as the coarse filling material, there are an instantaneous setting material and a cement-type or bentonite type suspension-type injection material, which can be properly used depending on the properties and soil properties of the target ground.

  Moreover, as the instantaneous setting injection material, for example, a water glass solution type grout material excellent in caking property or a suspension type injection material having a short gel time is suitable. Furthermore, water permeability such as nets, woven fabrics, non-woven fabrics, water-permeable synthetic resin coatings, various drain materials, etc. in the gap between the drilled hole and the injection outer tube in the permeable injection material injection part below the rough filling injection material injection part It is possible to prevent the hole wall from collapsing by installing a columnar penetrating water-conducting member made of a material having the above.

  This columnar penetrating water-conducting member not only protects the collapse of the hole wall, but also forms a columnar space and guides the injected material discharged from the injection material discharge port over the entire length of the injection part of the injection outer tube even when it collapses However, a structure that enables columnar penetration is desirable.

  For that purpose, it is desirable to have a structure capable of forming a thick water-permeable material or a space having a certain thickness for the injection material to be guided by injection pressure. More preferably, it is desirable that the aperture ratio with respect to the drilling wall is large. The thickness of the material of the columnar penetrating water conducting member or the size of the space is preferably about 0.5 cm to 3 cm.

  In such a column-shaped permeation guide member, even if the coarsely packed infusion material passes through the rough soil layer to the columnar space of the column-shaped seepage guide member, or the injection solution that has been gelled enters from the adjacent injection hole, The columnar permeation guide member has an effect of protecting the injection space by blocking the permeable injecting material discharge port of the outer injection pipe covered by the columnar permeation guide member.

  It should be noted that at least one pair of the upper and lower outer tube packers sandwiching the rough filling injection material discharge port and the rough filling injection material discharge port vertically may be at any one position in the tube axis direction of the injection outer tube. For example, it may be the uppermost part near the ground surface or may be provided at a rough soil layer. In addition, the permeable injecting material discharge ports can be provided in at least one or a plurality of locations at arbitrary positions in the tube axis direction of the outer injection tube.

  In addition, by installing the columnar infiltration water conducting member, the permeable injecting material discharge port will not be clogged with slime etc. in the drilling hole, so the necessary amount of permeable injecting material can be surely put in the surrounding ground Osmotic injection can be performed.

  Examples of the permeable injection material include inorganic suspension type in addition to solution type silica grout such as silica colloid type, silica sol type, organic type water glass, inorganic type water glass, etc. having excellent permeability, strength and durability. An injection material is suitable.

  In FIG. 2, a pair of upper and lower inner tube packers of the injection inner tube inserted into the injection outer tube are installed so as to straddle the coarse filling injection material discharge port and the injection material discharge ports of the upper and lower outer tube packers. Thus, it is possible to simultaneously inject and inflate the coarsely packed injection material into the bag body of the outer tube packer and to inject the coarsely packed injection material into the ground.

  Also, at that time, if the resistance pressure of the check valve of the coarse filling injection material discharge port is made larger than the resistance pressure of the check valve of the injection material discharge port in the outer tube packer, the expansion of the outer tube packer is preceded. Can be made.

  In this case, the resistance pressure of the check valve of the injection material discharge port is adjusted by adjusting the elastic force of the rubber sleeve as the check valve or by adjusting the opening area of the injection material discharge port. can do.

The ground improvement device according to claim 2 is the ground improvement device according to claim 1 , wherein the suspending injection material or the instantaneous setting injection material in the upper and lower outer tube packers is the suspending injection material or the instantaneous setting injection material. In the space consisting of the injection outer tube, the upper and lower outer tube packers, and the drilling wall in the injection part, the fine particles of the suspension injection material or the gel of the instantaneous injection material permeate through the columnar bag and solidify. In order to form a hole wall protector, the suspension injection material or the instantaneous setting injection material is discharged through the discharge port between the injection inner tube and the upper and lower outer tube packers at the injection pressure. It is characterized by being injected so as to break the wall protector and solidify together with the soil around the soil packer to form a large-diameter soil packer (see FIGS. 2 to 4).

  Normally, when an outer tube packer is formed by injecting a suspension-type solidified material into a columnar bag provided close to the coarsely packed injection material discharge port, the surrounding soil is pushed away by the expansion of the bag. Then, the soil wraps around the space in contact with the coarsely packed injection material discharge port and the coarsely packed injection material discharge port is blocked, and subsequent injection of the coarsely packed injection material is difficult.

  According to the present invention, the hole wall protector formed of a part of the solidified material (fine-grained portion) that has permeated the columnar bag body is formed in the drilling hole between the upper and lower outer tube packers. Does not happen.

  In this case, the interval L1 between the upper and lower outer tube packers is not more than 1/2 of the length L3 of the outer tube packer in the tube axis direction (see FIG. 9), and between the outer tube packers of the permeable injecting material injecting portion. It is desirable to make it smaller than the interval L2 (see FIG. 2).

  Moreover, what has a water-permeable function, such as linen cloth, a woven fabric, a nonwoven fabric, a water-permeable synthetic resin, a net | network material, is suitable for a columnar bag body, for example.

The ground improvement device according to claim 3 is the ground improvement device according to claim 1 or 2, wherein outer tube packers are provided on both upper and lower sides or one side of the discharge port of the permeable injection material in the permeable injection material injection portion. The outer tube packer is attached and is a water-permeable columnar bag made of linen, woven fabric, non-woven fabric, water-permeable synthetic resin, or netting material, which is capable of permeating fine particles of the suspension injection material or gel of the quick-setting injection material. It is characterized by being formed from the body and the suspension injection material or instantaneous setting injection material with which the said columnar bag body was filled (refer FIGS. 1-4).

  Generally, as the columnar injection source of the osmotic injection material becomes longer in the tube axis direction, the injection pressure of the osmotic injection material decreases, and the injection pressure of the osmotic injection material tends to vary depending on the location. For this reason, there exists a possibility that a permeable injection material may not be uniformly inject | poured into the whole injection | pouring stage.

  According to the present invention, the outer tube packer is attached to the upper and lower sides or at least the upper side of each permeable injecting material discharge port, and when the soil layer is complicated, the columnar osmotic source of the permeable injecting material continuous in the tube axis direction By partitioning into a plurality, the injection pressure of the osmotic injection material can be kept constant, whereby the injection material can be uniformly osmotically injected over a wide range with a large discharge amount and low pressure.

  The ground improvement device according to claim 4 is the ground improvement device according to any one of claims 1 to 3, wherein a columnar infiltration is formed in a space between the outer wall of the permeable injecting material injection portion and the hole wall. A water guide member is attached, and a check valve is attached to the permeable injecting material discharge port of the outer injection pipe.

  According to the present invention, by installing a water-permeable columnar infiltration water guiding member in the drilling hole of the permeable injecting material injecting portion, the hole wall is not easily collapsed even if the columnar injection source is long, and even if the hole wall is disintegrated. However, a large columnar injection source can be held in the tube axis direction, low-pressure injection is possible with a large discharge amount, and a wide interval between injection holes is possible, enabling a wide range of infusion injection.

  For the column-shaped penetrating water-conveying member, for example, a cylinder or a woven fabric, a non-woven fabric, a water-permeable synthetic resin, various drain materials, and the like formed as described above in a cylindrical shape or a space inside. A cage shape or a belt shape can be used (see FIGS. 7 to 11).

  The ground improvement device according to claim 5 is the ground improvement device according to claim 4, wherein the columnar infiltration water conducting member is a water-permeable inflatable tube or a net-like body, and the injection outer tube in the permeable injecting material injecting portion. It is attached to the outer periphery, and a check valve is attached to the permeable injecting material discharge port (see FIG. 6).

  According to the present invention, the expansion and contraction tube that expands with the injection pressure of the osmotic injection material can prevent the pore wall from collapsing and clogging of the permeable injection material discharge port accompanying the collapse. In addition, there is an effect that the hole diameter can be reduced.

  Furthermore, since the columnar osmotic water conducting member forms a space that becomes a columnar osmotic source by covering one or more permeable injecting material discharge ports to which the check valves are attached, Therefore, there is no possibility that the injected material or groundwater injected into the surrounding ground at the other injection stage where the injection is completed flows backward from the permeable injected material discharge port into the outer injection tube.

  In addition, between a plurality of adjacent holes, the injected material injected into the ground in a certain hole may flow back into the injection outer tube set up in another hole or fill the columnar space. Yes, this can be prevented.

  Furthermore, in the same drilling hole, there is a risk that the injected material will get over the outer tube packer and will be transferred to another injection stage, backflowing from the permeable injected material discharge port into the injected outer tube, or filling the columnar space. However, such a phenomenon can be prevented.

  According to the embodiment of the present invention, even if the column penetration source is long, the column penetration penetration member is provided on the wall of the injection outer tube in the section, and the back flow of the injection is prevented at each permeable injection material outlet. The above-mentioned problem does not occur because the check valve is attached.

  In addition, even if a permeable injecting material that has been gelled or a coarsely packed injecting material injected from another injection material discharge port into the space between the columnar infiltrating water guiding member and the hole wall, By blocking, the column penetration source of the permeable injection material injection part is secured, and the permeable injection material spreads throughout the column space through the space formed by the column penetration penetration member. Can be reliably injected.

  Furthermore, since the entire columnar water guiding member is water permeable, even if there is a small number of permeable injecting material outlets in the injection outer tube, even one permeable injecting material can be uniformly distributed in the surrounding ground over the entire length of the injection stage. Osmotic injection.

  The ground improvement device according to claim 6 is the ground improvement device according to claim 4, wherein the columnar infiltration water conducting member is a belt-like infiltration water conducting member, and an outer periphery of the injection outer tube in the permeable injecting material injecting portion A check valve is attached to the permeable injecting material outlet of the outer injection tube in a spiral shape in the tube axis direction (see FIG. 7).

  According to the present invention, since the opening ratio of the columnar space is larger than that of covering the entire outer peripheral surface of the injection outer tube with the columnar infiltration water-conveying member, the injection material infiltration source is large. be able to.

  Moreover, since a space is ensured by the arch action of surrounding earth and sand in the water guide groove between the adjacent belt-shaped water guide members, a large injection material penetration source can be obtained. In addition, the amount of band-shaped water conveyance member used can be reduced.

  For this reason, even if one permeable injection material discharge port is formed in the injection outer tube, the injection material discharged from the permeable injection material discharge port strips the surface of the injection outer tube. Since it is guided to the water guide member and the water guide groove, it is infused into the surrounding ground widely and evenly.

  The columnar penetrating water conducting member and the strip shaped water conducting member are made of a material having water permeability such as a woven fabric, a non-woven fabric, or a water permeable synthetic resin, and a constant thickness of about 0.5 cm to 3 cm, for example, from a synthetic resin. And can be formed from a three-dimensional network material formed into a three-dimensional network.

A ground improvement device according to claim 7 is operated by a plurality of ground improvement devices according to any one of claims 1 to 6, a storage tank for injection material, and an independent drive source , respectively. a plurality of unit pumps for the injection material, respectively pumped from the storage tank to the soil modifying apparatus, and the flow pressure detector for detecting the flow rate and pressure of the injection material, a valve for starting and interrupting the feeding of the injection material, each unit A pump rotation speed irregularity machine and a centralized management device for controlling the unit pump, the flow rate pressure detector, the valve and the rotation speed irregularity machine are provided (see FIG. 12).

  In general, alluvium is composed of two layers of soil, and the hydraulic conductivity is large in the horizontal direction. Therefore, in order to form a large-diameter consolidated body on the ground consisting of a rough upper layer or on the ground surface where the injected material is likely to be transferred to the ground surface side, a large soil to prevent the injected material from being transferred to the upper layer portion. It is necessary to form a middle packer.

  According to the present invention, the outer tube packer is formed by injecting the solidifying material into the water-permeable bag body, and further, the soil packer made of the solidified material and the soil that has permeated the bag body is formed around it, By simultaneously injecting the coarse filling material into the surrounding ground from the plurality of coarse filling material discharge ports in the upper layer, it is possible to simultaneously replace the ground filling material by pushing the groundwater in a predetermined direction. A large-diameter soil packer that is uniformly continuous in the upper layer portion can be formed.

  Also, after the formation of the large-diameter soil packer in the upper layer by injection of the coarsely packed injection material, the injection inner tube elevator is operated to set the injection inner tube to the injection material discharge port corresponding to the next injection stage, Then, by simultaneously injecting the permeable injecting material into the surrounding ground from the permeable injecting material discharge port, a large-diameter consolidated body composed of the permeable injecting material and the surrounding soil can be continuously formed in the horizontal direction. it can.

  In addition, the osmotic injection material can be injected in a laminar flow at a low pressure by injecting the osmotic injection material horizontally from a long columnar space by simultaneously injecting the osmotic injection material from a plurality of permeable injection material outlets. Therefore, the injection material discharged from the plurality of permeable injection material discharge ports can penetrate between the soil particles while pushing the ground water without being obstructed to each other in a certain direction, and can form a homogeneous consolidated body. .

  A large-diameter solidified body can be continuously and automatically formed by infiltrating the soil particles at a low pressure without causing the permeable injecting material to escape by the above construction method.

  Then, when the injection in the predetermined injection layer is completed, the injection stage management device instructs the injection inner tube elevator to move the injection inner tube to the next injection stage in accordance with an instruction from the central management device.

  In addition, the centralized control device receives information from the pressure flow rate measuring instrument about the injection pressure, injection speed, and injection amount of the osmotic injection material at each injection material discharge port, and instructs each injection device based on that information. Controls the injection material discharge port, or manufactures the injection material in the injection material storage tank and manages the liquid feeding to the unit pump through the conduit.

  In addition, the central management device instructs the inner pipe elevator to move to the next injection stage by instructing the injection stage management device when the injection at a certain injection point is completed based on the information from the flow pressure detector, Or the valve | bulb is opened and closed and the injection material is sent through a conduit to another injection inner pipe.

The ground improvement construction method according to claim 8 is the ground improvement construction method using the ground improvement device according to any one of claims 1 to 6, wherein an injection outer tube is injected into the drilling hole and the injection outer tube is injected into the injection outer tube. Stand up the inner pipes respectively, and fill the columnar bag body with the suspension injection material or the instantaneous setting injection material by the injection inner pipe, so that the suspension pipe injection material or the instantaneous setting injection material is placed on both upper and lower sides of the discharge port. The outer tube packer is formed, and the outer tube packer is made up of fine particles of the suspended infusate that has permeated through the columnar bag or the gel of the instantaneous infusion material and the soil around the outer tube packer. A hole made of fine particles of suspension injection material or gel of instantaneous setting injection material that forms a packer and further penetrates the columnar bag into the space between the hole wall between the upper and lower outer tube packers and the injection outer tube. forming a wall protector, then, between the upper and lower outer tube packer from the injection in the tube Suspendability of the suspension filler around the soil packer by injecting the suspension injection material or the instantaneous setting injection material into the ground by breaking the hole wall protector with the discharge pressure through the inlet discharge port. Forming a large-diameter soil packer composed of an injection material or a quick-set injection material and soil around the soil packer, and then, using the injection inner tube, immersing the osmotic injection material in the permeable injection material injection section By injecting the permeable injection material into the surrounding ground from the outlet, a large-diameter consolidated body composed of the permeable injection material and soil is formed below the large-diameter soil packer. (See FIGS. 2 to 12).

  In the above, the hole is drilled by the casing, the outer pipe is inserted into the casing, the casing is pulled out, and the outer pipe is installed in the ground. When the casing is pulled out, the hole is filled with seal grout and injected. The outer tube can be fixed in the ground.

The ground improvement method according to claim 9 is the ground improvement method using the ground improvement device according to claim 7, wherein the ground improvement device is arranged at a plurality of injection points at predetermined intervals, and a flow pressure detector. Based on the flow rate and / or pressure data signal of the injection material at each injection point transmitted from the central control device to the central control device, the injection status at each injection point is collectively monitored by the central control device, and from the storage tank of the injection material The injection material is pumped to each injection point at an arbitrary injection speed, injection pressure, and injection amount by the operation of each unit pump, and simultaneously injected into a plurality of injection points (see FIG. 12). .

Ground improvement method according to claim 10, wherein, in the ground improvement method according to claim 8 or 9, suspended in columnar bag body of the outer tube packer positioned above and below the outlet of the suspendable injection material or Madokayui infusion material The step of filling the turbidity injection material or the instantaneous setting injection material and the step of injecting the suspension injection material or the instantaneous setting injection material from the discharge port between the upper and lower outer tube packers into the ground are performed in the outer injection tube. The upper and lower inner tube packers are inserted at the same time so that the position of the upper and lower inner tube packers is sandwiched between the discharge port of the suspending injection material or the instantaneous setting injection material and the discharge port of the upper and lower outer tube packers. (See FIG. 10B).

The ground improvement construction method according to claim 11 is the ground improvement construction method according to claim 8 or 9, in the ground improvement construction method according to claim 8 or 9, wherein the top and bottom of the discharge port of the permeable injection material in the permeable injection material injection portion. An outer tube packer is formed by filling a columnar bag body with a suspension injection material or an instantaneous setting injection material on both sides or at least the upper side (see FIGS. 2 to 12).

  The ground improvement construction method according to claim 12 is the ground improvement construction method according to claim 8 or 9, wherein the injection outer pipe in the permeable injecting material injecting portion is provided with a columnar infiltration water guiding member in a space between the drilling wall. It is installed and a check valve is attached to the permeable injecting material discharge port (see FIGS. 2, 3, and 6 to 12).

  The ground improvement construction method according to claim 13 is the ground improvement construction method according to claim 8 or 9, wherein a columnar infiltration water guiding member is installed in a spiral shape in an injection outer tube in the permeable injecting material injecting portion, and the permeable injecting material. A check valve is attached to the discharge port (see FIG. 7).

  The ground improvement construction method according to claim 14 is the ground improvement construction method according to claim 12, wherein the columnar infiltration water conducting member is a water permeable expansible tube, and a check valve is attached to the permeable injecting material discharge port. It is a characteristic (see FIG. 6).

  In the present invention, since the water-permeable expansible tube as the columnar osmotic water-conducting member covers the permeable injecting material injecting portion, even if the space between the drilling wall and the outer injection tube is filled with the sleeve grout, Space can be maintained. For this reason, the hole wall can be stabilized even in the ground where the drilled wall is likely to collapse.

  The ground improvement method according to claim 15 is the ground improvement method according to any one of claims 8 to 12, wherein a space between the outer pipe and the hole wall is filled with seal grout. Is.

  The ground improvement construction method according to claim 16 is the ground improvement construction method according to claim 15, wherein the columnar infiltration water conducting member is provided to be separated for each predetermined injection stage in the injection outer pipe of the permeable injection material injection portion. (See FIG. 8B).

  When soil layers with complicated geology are stacked, if the section of the permeable injecting material conduit is divided and provided with several columnar infiltrating conduit members so as to cover the permeable injecting material outlet for each injection stage, Since each water conveyance part is divided by a sealing material, a columnar infiltration space is formed for each section. For this reason, optimal columnar infiltration into the soil layer can be performed for each predetermined stage.

  By the way, if the column-shaped water conveyance part is distributed over the entire length of the outer pipe surface, the permeable injecting material injected from one point is injected into the ground over the entire length, so it concentrates on the highly permeable soil layer. This is because it will be injected.

  According to the present invention, by forming the large-diameter soil packer near the ground surface around the injection tube, the permeable injectant to be injected later below the large-diameter soil packer mainly extends around the injection tube. Escaping to the ground surface side can be prevented, so that the permeable injecting material can be uniformly and reliably infiltrated (infiltrated between soil particles) into the target ground.

  In addition, since it is possible to secure a columnar injection source that is long in the tube axis direction under the large-diameter soil packer, it is possible to increase the drilling interval, and to infiltrate between soil particles (penetration injection) at a large discharge amount and low pressure. There is an effect that a large-diameter consolidated body (ground improvement body) can be easily and reliably formed.

  Furthermore, even when the ground including a permeable layer such as a gravel layer or sandy layer is improved, the injection material injected into the ground is prevented from escaping from the permeable layer such as a gravel layer or sandy layer. Thus, the injection material can be reliably injected into each layer and the ground can be strengthened.

  Also, even if the outer tube packer length is shortened, a large soil packer can be formed in the soil, and the escape of the injection material to the rough soil layer can be prevented. A long columnar permeation source can be formed, and even if it is injected at a high discharge rate per stage, it can be injected at a low injection pressure, so that a large solid body can be formed. Economical and excellent effects can be expected.

It is a longitudinal cross-sectional view which shows one Embodiment of the ground improvement apparatus and ground improvement construction method of this invention, and shows the injection | pouring outer tube | pipe installed in the drilling hole. 1 shows an embodiment of a ground improvement device and a ground improvement method according to the present invention, wherein (a) and (b) show a method of inflating a columnar bag body in a drilling hole to form an outer pipe packer and an injection outer pipe and injection It is a longitudinal cross-sectional view of an inner pipe. 1 shows an embodiment of a ground improvement device and a ground improvement method according to the present invention, and shows a method for injecting a coarsely packed injection material, a quick setting injection material, or a suspension injection material into the ground using an injection inner pipe. It is a longitudinal cross-sectional view of a pipe and an injection inner pipe. It is a longitudinal cross-sectional view of an injection outer pipe and an injection inner pipe which shows one embodiment of the ground improvement device and ground improvement construction method of the present invention, and shows a method of injecting a permeable input into the ground using an injection inner pipe. An injection inner pipe is shown, (a) is a front view showing an injection inner pipe for injecting a suspension injection material or a osmotic injection material from a coarsely packed injection material injection part or a permeable injection material outlet into a columnar bag. Fig., (B) is a front view showing an injection inner tube for injecting a coarsely packed injection material or a quick setting injection material into the ground from the coarsely packed injection material injection portion, and (c) is a permeable injection material injection portion. It is a front view which shows the injection | pouring inner tube | pipe for inject | pouring a permeable injecting material simultaneously into a several injection | pouring stage from the ground. The other embodiment of the method of inject | pouring a permeable input material into the ground using an injection | pouring inner pipe is shown, (a) is a longitudinal cross-sectional view of an injection | pouring outer pipe | tube and an injection | pouring inner pipe, (b) is the partially expanded cross section. FIG. The other embodiment of the method of inject | pouring a permeable input material into the ground using an injection | pouring inner pipe is shown, (a) is a longitudinal cross-sectional view of an outer injection pipe and an injection inner pipe, (b), (c) is the It is a partially expanded sectional view. 2A and 2B show another embodiment of the present invention, in which FIG. 1A is a longitudinal sectional view showing an outer injection pipe installed in a drilling hole, and FIG. 2B is a seal grout material filled between the drilling wall and the outer injection pipe. It is a longitudinal cross-sectional view which shows the state which carried out. It is a longitudinal cross-sectional view of the injection | pouring outer tube | pipe and injection | pouring inner tube which shows other embodiment of this invention and shows the method of expanding the columnar bag body of an injection | pouring outer tube | pipe in a drilling hole, and forming an outer tube | pipe packer. Another embodiment of the present invention is shown, wherein (a) shows an injection outer tube showing a method of injecting a suspension injection material or a quick-setting injection material, which is a coarsely packed injection material, into the ground using an injection inner tube, and The longitudinal cross-sectional view of an injection | pouring inner pipe, (b) is at the time of performing simultaneously the injection | pouring of the injection material to the columnar bag body of an upper and lower outer tube | pipe packer, and the injection | pouring material into a ground through a coarse filling injection material discharge port. It is a longitudinal cross-sectional view which shows the position of an injection | pouring outer tube | pipe and an injection | pouring inner tube. It is a longitudinal cross-sectional view of the injection outer tube | pipe and injection | pouring inner tube which shows other embodiment of this invention, and shows the method of inject | pouring a permeable input material into the ground using an injection | pouring inner tube. The description which showed other embodiment of this invention and showed the ground improvement apparatus and the ground improvement construction method which were comprised so that a coarse filling injection material and a permeable injection material could be simultaneously injected into the multiple points of a ground, respectively. FIG. The conventional injection tube is shown, (a) is the longitudinal cross-sectional view, (b) is the cross-sectional view.

  1 to 5 are conceptual diagrams showing an embodiment of a ground improvement device and a ground improvement method according to the present invention. In the figure, reference numeral 1 is an outer injection tube set up in the bore hole a, reference numeral 2 (see FIG. 2), reference numeral 3 (see FIG. 3) and reference numeral 4 (see FIG. 4) are all in the outer injection pipe 1. It is an injection inner tube that is stood up. Reference numeral 7 denotes a columnar seepage water guiding member provided in the injection outer tube 1.

  The injection outer tube 1 includes one or a plurality of coarse filling material injection material injection portions 5 and 5 provided near the ground surface in the tube axis direction of the injection outer tube 1 or near the soil layer below the injection outer tube 1 and coarse filling. The permeable injection material injection part 6 provided at least below the injection material injection parts 5 and 5 or between the coarse injection material injection parts 5 and 5 is provided.

  The coarsely filling injection material injecting section 5 is composed of a rough filling injection material discharge port 5a and a pair of outer tube packers 5b and 5b attached on both upper and lower sides of the rough filling injection material discharge port 5a. It is provided at a predetermined interval in at least one or two or more directions.

  A check valve 5c made of an elastic rubber sleeve or the like for preventing the backflow of the injection material is attached to each coarsely packed injection material discharge port 5a.

  The permeable injecting material injecting section 6 has at least one place or a predetermined interval at least in the downward direction of the pair of outer tube packers 5b, 5b sandwiching at least the roughly packed injecting material discharge port 5a in the tube axis direction of the injecting outer tube 1. The permeable injecting material discharge ports 6a are each provided with a check valve 6c for preventing the backflow of the injecting material.

  In addition, the outer tube packer 6b other than the pair of outer tube packers 5b and 5b sandwiching the roughly filled injection material discharge port 5a can be alternately provided with one or a plurality of permeable injection material discharge ports 6a in the tube axis direction.

  Both the outer tube packers 5b and 6b are formed to be larger than the inner diameter of the drilling hole I by filling a water-permeable columnar bag with a cement-based solidifying material or a quick-setting injection material. The columnar bags of the outer tube packers 5b and 6b are detachably attached so that the positions can be changed.

  The interval L1 between the outer tube packers 5b and 5b is narrower than the interval L2 between the outer tube packers 6b and 6b (FIG. 2 (a)), and if the length of the outer tube packer 5b is L3, L1 ≦ 1 / 2L3, which is set in a range of approximately L1 = L2 × 0.05 to 0.3. Usually, L1 = about 20 mm to 300 mm is desirable. Usually, the length L3 of the outer tube packer 5b is preferably about 0.3 to 2 m.

  The injection inner pipe 2 illustrated in FIGS. 2 and 5 (a) is an injection pipe for injecting a cement-based solidified material from the ground into the columnar bags of the outer pipe packer 5b and the outer pipe packer 6b. A pair of inner tube packers 2b and 2b are provided at both ends of the injection material discharge port 2a and the injection material discharge port 2a at the tip, and the inner tube packer 2b is configured to expand when air or liquid is injected. Yes.

  Then, at the positions of the outer tube packer 5b and the outer tube packer 6b, the upper and lower inner tube packers 2b, 2b are expanded and brought into close contact with the inside of the injection outer tube 1, and the outer tube packer 5b and the outer tube packer 6b are injected from the injection inner tube 2. Drilling holes by injecting a cement-based solidifying material into the columnar bag body of each packer from the ground via the injection inner pipe 2 and expanding them through the injection inner pipe 2. It is possible to form the outer tube packer 5b and the outer tube packer 6b having a diameter larger than the diameter i. In addition, the injection inner pipe 2 is provided with a suspension injection material or a permeable injection material from a coarse injection material discharge port 5a of the rough injection material injection portion 5 and a permeable injection material outlet 6a of the permeable injection material discharge portion 6. Of course, injection is possible.

  The injection inner pipe 3 shown in FIGS. 3 and 5 (b) is used for injecting a two-component injection material into the ground from the ground via the coarse injection material discharge port 5a of the rough injection material injection unit 5. Although it is an injection tube, it is possible to inject instantaneous setting injection materials such as suspension grout and osmotic grout. Of course, the osmotic injection material can be injected from the osmotic injection material discharge port 6a. is there.

  The injection inner tube 3 is provided with an A liquid injection inner tube 3a and a B liquid injection inner tube 3b, and an injection material discharge port 3c for mixing the liquid A and the liquid B and discharging them into the ground at the tip. Inner tube packers 3d and 3d are provided on both upper and lower sides of the injection material discharge port 3c.

  The inner tube packer 3d is formed of a rubber tube or the like, expands in the injection outer tube 1 by filling with air or liquid from the ground, and is in close contact with the inner wall of the injection outer tube 1 between the injection outer tube 1 and the injection inner tube 2. Is sealed on both the upper and lower sides of the injection material discharge port 3c to secure an injection material flow path leading to the coarsely packed injection material discharge port 5a.

  The inner packing packers 3d and 3d are expanded at the position of the rough packing injection material discharge port 5a of the rough packing injection material injection section 5 and are brought into close contact with the inside of the injection outer pipe 1 to be injected from the injection inner pipe 3 into the rough packing injection material 3. The injection material flow path leading to the discharge port 5a can be secured, and then the coarsely packed injection material can be injected from the ground into the ground via the injection inner tube 3.

  The injection inner tube 4 shown in FIGS. 4 and 5 (c) is an injection tube for injecting the permeable injection material from the ground into the ground via the permeable injection material injection portion 6, and a plurality of injection tubes are provided at the tip. The permeable injecting material discharge ports 4a and 4a and the permeable injecting material discharging ports 4a and 4a are provided with a plurality of inner tube packers 4b and 4b on both upper and lower sides thereof.

  The inner tube packer 4b is formed of a rubber tube or the like, and expands in the injection outer tube 1 by being filled with air or fluid from the ground, and is in close contact with the inner wall of the injection outer tube 1, thereby injecting the injection outer tube 1 and the inner tube packer 4b. By sealing the gap with the inner tube 2 on both the upper and lower sides of each injection material discharge port 4a, an injection material flow path leading to the permeable injection material discharge port 6a is secured.

  Then, the inner tube packers 4b and 4b are expanded at the position of the permeable injection material discharge port 6a of the permeable injection material injection portion 6 and are brought into close contact with the inner side of the injection outer tube 1 so that the permeable injection material is injected from the injection inner tube 4. An injection material flow path leading to the discharge port 6a is secured, and then the permeable injection material is simultaneously injected from the plurality of injection stages or the plurality of permeable injection material discharge ports 6a from the ground into the ground through the injection inner tube 4. be able to.

  The column-shaped infiltration water conducting member 7 is provided outside the injection outer pipe 1 and is in the gap between the hole wall of the piercing injection material injection portion 6 and the injection outer pipe 1, and the hole wall of the hole I In addition to preventing collapse, the permeable injection material discharged from the permeable injection material discharge port 6a is guided to the columnar infiltration space through the columnar infiltration water guide member 7, and the soil particles from the columnar infiltration space into the ground Allows interpenetration.

  Further, even if the permeable injecting material discharge port 6a is clogged with slime or the like in the borehole i, or the borehole wall collapses and the columnar penetration space is blocked, the columnar penetration source is retained. For example, it is formed from the material which has water permeability, such as a net | network body, a woven fabric, a nonwoven fabric, a water-permeable synthetic resin, and various drain materials.

  As a result, a necessary amount of the permeable injecting material can be infused into the surrounding ground from the columnar infiltration space.

  Next, the ground improvement method according to the present invention will be described.

  (1) First, a preliminary survey is conducted on the ground subject to ground improvement, such as drilling, and necessary data such as the presence / absence, type, position, and thickness of the permeable stratum are collected. Then, based on the investigation results, the position (depth), number, L1, L2, etc. of the coarsely packed injection material injection part 5 and the permeable injection material injection part 6 are respectively determined, and the outer tube packer 5b and The columnar bag body of 6b is attached. Moreover, the columnar infiltration water guiding member 7 is attached between the columnar bag bodies of the outer tube packers 6b of the permeable injecting material injecting section 6.

  (2) Next, the injection outer tube 1 is set up in the drilling hole A, and the injection inner tube 2 is set up in the injection outer tube 1.

  Then, the columnar bag body is expanded by injecting the solidifying material into the columnar bag bodies of the outer tube packers 5b and 6b from the ground through the injection inner pipe 2, so that the outer pipe having a diameter larger than the drilling hole a. Packers 5b and 6b are formed.

  In addition, an under-packer A1 made of a part of the solidified material that has passed through the packer and the surrounding soil is formed on the outer periphery of each outer tube packer 5b, 6b. Further, a hole wall protector 8 made of a part of the solidified material that has passed through the outer tube packer 5b is formed between the outer tube packers 5b, 5b of the coarsely packed injection material injection portion 5. The hole wall protector 8 is mainly formed by solidifying the solidifying material fine particles, and has a much lower strength than the soil packer A1.

  (3) Next, the injection inner tube 2 is pulled out from the injection outer tube 1, and the injection inner tube 3 is stood in the injection outer tube 1. Then, the suspension-type injection material or the instantaneous-setting injection material is injected from the ground into the coarsely-packed injection material injection portion 5 through the injection inner tube 3. The instantaneous setting injection material is a two-component injection material, in which the liquid A is injected into the injection inner tube 3a and the liquid B is injected into the injection inner tube 3b.

  Then, the liquid A and the liquid B are mixed at the tip portions of the injection inner tube 3a and the injection inner tube 3b, pass through the injection material discharge port 3c, crush the hole wall protector 8 from the coarse injection material discharge port 5a, and enter the ground. Discharged.

  And it solidifies with the surrounding soil and forms a larger soil packer A2 around the soil packer A1. Therefore, a large-diameter soil packer is formed on the outer periphery of the coarsely packed injecting material injection portion 5, which is composed of the outer tube packer 5 b and the soil packer formed in the periphery from the soil packers A 1 and A 2. .

  (4) Next, the injection inner tube 3 is pulled out from the injection outer tube 1 and the injection inner tube 4 is stood in the injection outer tube 1. Then, the permeable injection material is injected from the ground into the permeable injection material injection portion 6 through the injection inner tube 4. Then, the permeable injecting material is infused and injected into the surrounding ground from the permeable injecting material discharge port 6a and solidifies together with the surrounding soil to form a large-diameter consolidated body B.

  In this case, the interval L2 between the outer tube packers 6b, 6b of the permeable injecting material injection part 6 is considerably wider than the interval L1 between the outer tube packers 5b, 5b of the coarsely packed injection material injection part 5, and therefore the permeable injection material. The injection section 6 is formed with a columnar injection source that is long in the direction of the tube axis of the outer injection tube 1, so that even a low-pressure injection can uniformly inject a large volume of permeable injection material into a wide range of ground. it can.

  In addition, since a large-diameter soil packer is formed in advance above the permeable injecting material injecting portion 6, the osmotic injecting material does not escape above the injecting outer tube 1. Therefore, it is possible to reliably infiltrate the entire formation without waste.

  Further, according to this embodiment, the large-diameter consolidated packer is formed on both the ground surface side in the tube axis direction and the underground in the opposite side with the permeable injecting material injecting portion 6 interposed therebetween. It is possible to prevent the permeable injecting material injected from the outside from being escaped in both the ground surface side and the underground side. In addition, you may install the coarse filling injection material injection | pouring part 5 and the permeable injection material part 6 by turns in the pipe-axis direction of the injection | pouring outer tube | pipe 1. As shown in FIG.

  In the above description, the roughly-filled injecting material injection part 5 is close to the ground part, and the rough-filled injecting material discharge port 5a only needs to be provided at one location above and below the outer tube packer 5b.

  6 (a) and 6 (b) show another embodiment of the present invention. In the embodiment of FIGS. 1 to 5, the expandable / contractible tube 9 is formed as a columnar infiltrating water-conducting member 7 in the permeable injecting material injecting portion 6. FIG. Is used.

  Moreover, a check valve 10 for preventing the backflow of the injection material is attached to each permeable injection material discharge port 6a.

  The inflatable tube 9 is attached so as to cover the surface between the upper and lower outer tube packers 6 b, 6 b of the injection outer tube 1, and its upper and lower ends are fixed to the injection outer tube 1 in a sealed state. The inflatable tube 9 is formed of a stretchable tube such as a rubber tube, and a plurality of permeable injecting material discharge ports 9a are formed as a whole.

  The permeable injecting material discharge port 9 a may be formed in a slit shape that is long in the circumferential direction or the axial direction of the expandable tube 9. The check valve 10 is made of an elastic material such as a rubber sleeve.

  In such a configuration, when the permeable injection material is injected from the ground into the permeable injection material injection portion 6 by the injection inner tube 4 standing in the injection outer tube 1, the permeable injection material pushes the check valve 10. It is spread and discharged into the expandable tube 9 from the permeable injecting material discharge port 6a.

  Furthermore, the expansible tube 9 expands due to the discharge pressure and comes into close contact with the hole wall of the drilling hole a. Then, the permeable injecting material is infused into the surrounding ground from the permeable injecting material discharge port 9a of the expandable tube 9 over the entire length of the injection stage.

  According to this embodiment, even if the hole wall of the drilling hole I collapses, the permeable injecting material is reliably put into the surrounding ground while protecting the hole wall of the drilling hole I by the expanded and contractible tube 9. Osmotic injection can be performed.

  In addition, since the columnar infiltration water conveyance member in the present invention is in the drilling hole 1 and is not in close contact with the drilling wall, the peripheral infiltration is completed at another injection stage where the injection is completed during the injection of the permeable injection material. It is conceivable that the permeable injection material or the groundwater injected into the ground flows back into the injection outer tube 1 from the permeable injection material discharge port 6a.

  Further, between a plurality of adjacent drill holes (i) and (b), the permeable injecting material injected into the ground in one drill hole (i) flows back into the injection outer pipe (1) set up in another drill hole (i). Can be considered.

  Further, it is conceivable that the permeable injecting material passes over the outer tube packer and escapes to another injection stage in the same drilling hole A, and flows back into the injecting outer tube 1 from the permeable injecting material discharge port 6a.

  However, the columnar osmotic water conducting member 9 of the present invention covers each permeable injection material discharge port 6a, and a check valve 10 for preventing the backflow of the injection material is relayed to each permeable injection material discharge port 6a. As a result, the above problems do not occur.

  Further, even if the space outside the columnar penetrating water-conducting member 9 is circulated by the suspension-type injecting material or the injecting material that has started to gel, or if the injected injecting material is gelled, the water-conducting member 9 blocks it. The injecting material discharged from the permeable injecting material discharge port 6a spreads in a columnar shape through the gap of the water guiding member to form a columnar infiltration source and is injected into the surrounding ground.

  Further, in the case of the expandable tube 9, a plurality of permeable injecting material discharge ports 9 a are provided throughout, so that the entire length of the injection stage can be reduced even if the number of permeable injecting material discharge ports 6 a in the outer injection tube 1 is small. The permeable injecting material can be uniformly infiltrated into the surrounding ground. And when installing in the drilling hole i, since the hole diameter of the drilling hole i can be made small, construction is easy and cost reduction can be aimed at.

  FIGS. 7A to 7C also show other embodiments of the present invention. In the embodiment of FIGS. 1 to 5, the strip-shaped water guide member 11 is provided as a column-like infiltrated water guide member in the permeable injecting material injecting portion 6. The outer injection tube 1 is attached in a spiral shape in the tube axis direction.

  The band-shaped water guide member 11 is made of a material having water permeability such as a woven fabric, a non-woven fabric, or a water-permeable synthetic resin, and further, a certain width from a three-dimensional network material formed in a three-dimensional network shape having a certain thickness from a synthetic resin or the like. It is formed in a belt shape having.

  Further, the belt-shaped water guide member 11 is attached between the upper and lower outer tube packers 6b and 6b of the injection outer tube 1 by being spirally wound in the tube axis direction of the injection outer tube 1 and between the adjacent belt-shaped water guide members 11 and 11. A water guide groove 12 having substantially the same width and a constant depth as the water guide member 11 is continuously formed in a spiral shape in the tube axis direction.

  The band-shaped water guide member 11 may be attached so as to cover the permeable injecting material discharge port 6 a of the outer injection pipe 1, or the permeable injecting material discharge port 6 a is exposed in the water conduit 12. It may be attached to.

  With such a configuration, the opening ratio of the columnar space becomes larger than the entire outer peripheral surface of the injection outer tube 1 in the permeable injection material injection portion 6 is covered with the cylindrical water guide member, so that the injection material penetration source is large. Thus, osmotic injection can be performed by low pressure injection even at a high injection rate.

  Of course, according to the present invention, a tubular mesh or a tubular body knitted into a basket can be used as the water guiding member.

  Moreover, since the space is ensured by the arch action of the surrounding earth and sand, the water conveyance groove | channel 12 between the strip | belt-shaped water conveyance members 11 and 11 which adjoins can obtain a big injection material penetration | infiltration source. Further, the amount of the band-shaped water guide member 11 used can be reduced.

  For this reason, even if one permeable injection material discharge port 6a is formed in the injection outer tube 1 in the long columnar space, the injection material discharged from the permeable injection material discharge port 6a is It is guided to the belt-like water guide member 11 and the water guide channel 12 and is infused into the surrounding ground widely and evenly.

  FIGS. 8-11 is a conceptual diagram which shows other embodiment of the ground improvement apparatus and ground improvement construction method of this invention, and in the figure, especially the injection | pouring outer tube | pipe 1 is a coarse filling injection material injection | pouring part near the ground surface. 5 and a permeable injecting material injection portion 6 having a plurality of permeable injecting material discharge ports 6a at predetermined intervals in the tube axis direction.

  Further, the gap L1 between the outer tube packers 5b and 5b is set to be approximately ½ or less of the length L3 of the outer tube packer 5b in the tube axis direction (see FIG. 9).

  According to this embodiment, by forming the large-diameter soil packer A2 near the ground surface around the injection outer tube 1, the permeable injectant to be injected later is injected below the large-diameter soil packer A2. It is possible to prevent the periphery of the outer tube 1 from being discharged to the ground surface side, thereby eliminating the waste of the permeable injection material and ensuring the permeable injection material in the ground below the large-diameter soil packer A2. Osmotic injection.

  In addition, since a columnar injection source that is long in the tube axis direction can be secured below the large-diameter soil packer A2, the interval between the drilling holes is increased, and a large discharge amount and low-pressure permeation between soil particles (penetration injection) ) Makes it possible to easily and reliably form a large-diameter consolidated body (ground improvement body).

  FIG. 8 (b) shows a case where a hole is drilled in the casing, the main injection pipe device is inserted into the casing, the pipe is pulled out while being filled with a seal grout material 23 such as cement bentonite, and the outer injection pipe 1 is installed in the ground. Then, after expanding the outer tube packers 5b and 5b and injecting the coarsely packed injection material to form a large outer tube packer, the inside of the injection from the permeable injection material discharge port 6a via the columnar infiltration water guiding member 7 The seal grout material 23 is broken through the tube 2 and injected.

  In particular, when the ground is composed of A, B, C, and D layers having different water permeability, the columnar infiltration water guiding member 7 is divided and provided in the injection outer tube 1 so as to correspond to each soil layer. Since the column-penetrating water conducting members 7, 7 are blocked by the seal grout material 23, the column-like infiltration is surely performed for each soil layer.

  Moreover, since the seal grout material 23 does not enter each columnar infiltrating water conducting member 7, since the water permeability is maintained, reliable columnar infiltration is performed for each soil layer.

  FIG. 12 shows another embodiment of the present invention, and a ground improvement device and a ground improvement method constructed so that a coarsely packed injection material and a permeable injection material can be simultaneously injected into a plurality of points on the ground, respectively. Is shown.

  In the figure, a plurality of drill holes i are formed at predetermined intervals at a plurality of points on the ground, and the outer injection pipes 1 of the ground improvement device shown in FIG. An injection inner tube 2 is set up in the tube 1.

  Each injection inner pipe 2 is connected to an injection material storage tank 13 in which a coarsely packed injection material and a permeable injection material are stored via a conduit 14, and each injection inner tube 2 is moved up and down. An injection inner tube lifting device 15 for changing the injection stage and an injection stage management device 16 for managing the injection stage of the injection inner tube 2 are respectively attached.

  Each conduit 14 has a unit pump 17 for pumping the coarsely packed and permeable infused materials from the storage tank 13 to each injecting inner tube 2 and for detecting the flow rate and pressure of the coarsely stuffed and permeable injectable materials. A flow rate pressure detector 18 and a valve 19 for starting and shutting off the pumping of the coarsely packed injection material and the permeable injection material are respectively connected.

  Each unit pump 17 includes a rotational speed transmission 20 such as an inverter, and is configured to be individually operated by an independent drive source 21 such as a motor. The unit pump 17, the rotational speed transmission 20, The pressure detector 18 and the valve 19 are each connected to a central management device 22 and are all controlled individually by the central management device 22.

  In such a configuration, when the flow rate / and / or pressure data signal from the flow rate pressure detector 18 is transmitted to the centralized control device 22, the coarsely packed injection material and the permeable injection material in the storage tank 13 are respectively connected to each unit. By the operation of the pump 17, the pump 17 is pumped to each inner pipe 1 at an arbitrary injection speed, injection pressure or injection amount.

  At a plurality of injection points, the coarsely filled injection material is simultaneously injected into the surrounding ground from the coarsely filled injection material discharge port 5a of each injection outer tube 1, and the permeable injection material is permeable to each injection outer tube 1. It is simultaneously injected into the surrounding ground from the injection material discharge port 6a.

  At that time, the injection inner tube 2 at each injection point is operated by the injection inner tube lifting / lowering device 15 according to an instruction from the central control device 22, so that the coarsely packed injection material injection unit 5 to the permeable injection material injection unit 6. The injection stage moves.

  Further, the unit pumps 17 usually constitute 5 to 100 units as a set and constitute a multi-injection injection device, and these unit pumps 17 can be arranged horizontally, vertically or three-dimensionally in one set. Each of these unit pumps 17 can be operated by a drive source 21 such as a motor.

  Each drive source 21 can be operated by a rotational speed transmission 20 such as an inverter controlled by a centralized management device 22.

  Therefore, according to this embodiment, it is possible to put together a single united infusion device that is composed of a large number of unit pumps 17 and has a small capacity as a whole and is compact.

  For this reason, when a plunger pump is used as the unit pump 17 in a set of multiple connecting devices, the discharge rate is 1 to 30 liters / minute at 50HZ. For example, when 10 units are used, the inverter is instructed by the central control room 22 Thus, while maintaining the optimum injection speed and injection pressure at a predetermined injection point, the entire injection amount from a large number of discharge ports (for example, 50 discharge ports) is controlled by the centralized control chamber 22 so that the total discharge amount is (1 to 1). 30) × 10 = 5 to 300 liters / minute is collectively managed, enabling low-pressure, low particle discharge and interparticle penetration, and shortening the construction period by rapid construction.

  The present invention can prevent injection of the injection material and reliably inject an optimal amount of injection material for each layer.

DESCRIPTION OF SYMBOLS 1 Injection outer pipe 2 Injection inner pipe 3 Injection inner pipe 4 Injection inner pipe 5 Coarse injection material injection part 5a Instantaneous material discharge port 5b Outer pipe packer 5c Check valve 6 Osmotic injection material injection part 6a Osmotic injection material discharge Outlet 6b Outer tube packer 6c Check valve 7 Column-shaped infiltration water guide member 8 Hole wall protector 9 Inflatable tube 10 Check valve 11 Strip-type water guide member 12 Water guide groove 13 Injection material storage tank 14 Conduit 15 Injection inner pipe lifting device 16 Injection Stage management device 17 Unit pump 18 Flow rate pressure detector 19 Valve 20 Rotational speed transmission 21 Drive source 22 Centralized management device
23 Seal grout material

Claims (16)

And a injection in tubes installed in the installing infusion outer tube and the injection outside tube in drilling, said injection outer tube suspended infusion which communicates with the injection outer tube and drilling walls in space an injection portion of the suspendable injection material or Madokayui infusion material and a plurality of outer tube packer attached to the upper and lower both sides of the discharge port and the discharge port of the timber or Madokayui infusion material, said injection A permeable injecting material injection portion having a plurality of permeable injecting material discharge ports provided in the outer tube, and the upper and lower outer tube packers are provided with fine particles of suspending injectable material or gel of quick setting injectable material. Formed from a permeable columnar bag made of permeable linen, woven fabric, non-woven fabric, water-permeable synthetic resin or netting material, and a suspension injection material or instant setting injection material filled in the columnar bag body , and the spacing between the upper and lower outer tube packer 1/2 narrower than the length of the tube axis direction of the upper and lower outer tube packer The suspension injecting material or instantaneous setting injecting material in the upper and lower outer tube packers has an injection material discharge port formed in communication with a columnar bag body in the injecting inner tube and the injecting outer tube. The fine particles of the suspension injectable material or the gel of the instantaneous infusion material permeate the columnar bag body and solidify around the outer tube packer together with the soil around the outer tube packer to form the soil packer. Further, the suspension injecting material or the instantaneous setting injecting material is put together with the soil around the soil packer through the discharge port between the injection inner tube and the upper and lower outer tube packers around the soil packer. A ground improvement device characterized by being injected to solidify to form a large-diameter soil packer . 2. The ground improvement device according to claim 1 , wherein the suspending injection material or the instantaneous setting injection material in the upper and lower outer tube packers is formed by the injection outer pipe and the upper and lower outer portions in the injection portion of the suspension injection material or the instantaneous setting injection material. In the space consisting of the tube packer and the drilling wall , fine particles of suspendable injection material or gel of instantaneous setting injection material penetrates the columnar bag and solidifies to form a hole wall protector. Filled and suspended suspension material or instantaneous setting material through the discharge port between the injection inner tube and the upper and lower outer tube packers, breaks the hole wall protector with the injection pressure, A ground improvement device which is injected so as to solidify together with soil and form a large-diameter soil packer . 3. The ground improvement device according to claim 1, wherein outer tube packers are attached to both upper and lower sides or one side of the discharge port of the permeable injection material in the permeable injection material injection portion, and the outer tube packer is suspended. A water-permeable columnar bag made of linen, woven fabric, non-woven fabric, water-permeable synthetic resin or netting material that can penetrate the fine particles of the water-soluble injection material or the gel of the quick-setting injection material, and the columnar bag body filled A ground improvement device characterized by being formed from a suspension injection material or a quick setting injection material .   In the ground improvement apparatus as described in any one of Claims 1-3, a columnar infiltration water conveyance member is installed in the space between the injection | pouring outer tube | pipe and a hole wall in a permeable injection material injection | pouring part, and the permeability | transmittance of an injection | pouring outer tube | pipe A ground improvement device, characterized in that a check valve is attached to the injection material discharge port.   5. The ground improvement device according to claim 4, wherein the columnar infiltrated water-conducting member is a water-permeable squeezable tube, and is attached to the outer periphery of the injection outer tube in the permeable injecting material injecting portion, and in the permeable injecting material discharge port. A ground improvement device, wherein a check valve is attached.   5. The ground improvement device according to claim 4, wherein the columnar infiltrating water conducting member is a belt-like water conducting member, and is attached to the outer periphery of the injecting outer tube in the permeable injecting material injecting portion in a spiral manner in the tube axis direction of the injecting outer tube, and A ground improvement device, characterized in that a check valve is attached to the permeable injecting material outlet of the outer injection pipe. A plurality of ground improvement devices according to any one of claims 1 to 6, a storage tank for injection material, and a storage tank for osmotic injection material, which are operated by independent drive sources , respectively. a plurality of unit pumps for pumping injection material, respectively, and a flow pressure detector for detecting the flow rate and pressure of the injection material, a valve for starting and interrupting the feeding of the injection material, a rotational speed anomalous machine of each unit pump, A ground improvement device comprising a central management device for controlling the unit pump, a flow pressure detector, a valve, and a rotation speed irregularity machine. In the ground improvement method using the ground improvement device according to any one of claims 1 to 6, the injection outer pipe is stood in the drilling hole, and the injection inner pipe is stood in the injection outer pipe, and the injection inner pipe By filling the columnar bag body with the suspension injection material or the instantaneous setting injection material , the outer tube packer is formed on both the upper and lower sides of the discharge port of the suspension injection material or the instantaneous setting injection material , and the outer tube A submerged suspension material that penetrates the columnar bag body around the packer or a gel in the instantaneous infusion material and soil around the outer tube packer is formed , and between the upper and lower outer tube packers. Forming a hole wall protective body made of fine particles of suspension injectable material permeated through the columnar bag body or gel of quick setting injectable material in the space between the hole wall and the outer injection tube , than injected into tube via the injection material discharge port between the upper and lower outer tube packer, suspending infusion Or, by injecting the instantaneous setting injection material into the ground by breaking the hole wall protector with the discharge pressure, the suspension injection material or the instantaneous setting injection material and the surrounding packer surroundings A large-diameter soil packer made of soil, and then injecting the permeable injecting material into the surrounding ground from the permeable injecting material discharge port in the permeable injecting material injecting portion using the injection inner tube A ground improvement construction method characterized in that a large-diameter consolidated body comprising a permeable injecting material and soil is formed below the large-diameter soil packer. 8. The ground improvement method using the ground improvement device according to claim 7, wherein the ground improvement devices are arranged at predetermined intervals at a plurality of injection points, and each injection transmitted from the flow pressure detector to the central control device. based on the flow rate and / or pressure data signal of the injection material at the point, each injection injection conditions at the point a while collectively monitored by the central control device, each unit pump injection material from the storage tank of the injection material into the injection point A ground improvement construction method characterized by pumping at an arbitrary injection speed, injection pressure, and injection volume by the operation of, and simultaneously injecting into a plurality of injection points. The ground improvement construction method according to claim 8 or 9, wherein the suspension injection material or the instantaneous injection material is placed in the columnar bag of the outer tube packer located above and below the discharge port of the suspension injection material or the instantaneous injection material. And the step of injecting the suspension injection material or the instantaneous setting injection material into the ground from the discharge port between the upper and lower outer tube packers, the position of the upper and lower inner tube packers in the injection inner tube in the injection outer tube The ground improvement method is carried out by inserting the suspension injection material or the instantaneous setting injection material so as to sandwich the discharge port of the upper and lower outer tube packers. 10. The ground improvement construction method according to claim 8 or 9, wherein the suspending injection material or the instantaneous setting injection material is formed in a columnar bag body on both upper and lower sides, or at least above the discharge port of the permeable injection material in the permeable injection material injection portion. A ground improvement method characterized in that an outer tube packer is formed by filling the surface.   The ground improvement construction method according to claim 8 or 9, wherein a columnar infiltration water guiding member is installed in a space between an injection outer pipe and a drilled wall in a permeable injecting material injecting portion, and a check is made at a discharge port of the permeable injecting material. Ground improvement method characterized by attaching a valve.   13. The ground improvement method according to claim 12, wherein the column-shaped infiltrating water-conducting member is installed in a spiral shape in a space between the injecting outer tube, the upper and lower outer tube packers, and the drilling wall in the permeable injecting material injecting portion, and permeable injecting. Ground improvement method characterized by attaching a check valve to the discharge port of the material.   13. The ground improvement construction method according to claim 12, wherein the columnar infiltration water-conveying member is a water-permeable squeezable tube, and is attached to the outer periphery of the injection outer tube in the permeable injection material injection portion, and is opposite to the discharge port of the permeable injection material. Ground improvement method characterized by attaching a stop valve.   The ground improvement construction method according to any one of claims 8 to 12, wherein a seal grout is filled in a space between the injection outer tube and the drilling wall. 16. The ground improvement method according to claim 15, wherein the column-shaped infiltrating water conducting member is provided in each of the injection outer pipes of the permeable injecting material injection portion so as to be divided for each predetermined injection stage.

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