JP3496983B2 - Injection material injection device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to boring in order to improve the lower foundation of a structure such as soft ground or a dam, and more particularly to boring in an audit corridor (a working tunnel of a dam). The present invention relates to an improvement of an injection material injection device for injecting an injection material into a predetermined region of the ground to be improved when performing the operation. 2. Description of the Related Art Such an injection method is carried out by digging a borehole in the ground to be improved and injecting an injection material through a rod inserted therein. [0003] Here, as the depth of the region into which the injection material is to be injected becomes deeper, the length of the rod must be increased. For this reason, conventionally, rods have been added at predetermined depths and inserted into boring holes. [0004] However, the work of adding rods is a very labor-intensive and dangerous work. Such a work of adding rods has been one of the causes of an increase in the cost of the injection method. On the other hand, in order to reduce the cost of drilling work,
It is desirable that the diameter of the boring hole is small. However, when the diameter of the boring hole is reduced, the rod to be inserted has to be selected to have a small diameter, and there is concern about strength. If the strength of the rod is insufficient, it is difficult to reliably improve the ground in a predetermined area, and there is a possibility that the safety of a building constructed on the ground after the construction is adversely affected. [0006] The present invention has been proposed in view of the above-mentioned problems of the prior art, and saves the labor involved in the work of adding rods and eliminates the need for adding rods, thereby reducing the risk in ground improvement work. It is an object of the present invention to provide an injecting material injection device that reduces the amount of soil and does not lower the safety due to ground improvement. SUMMARY OF THE INVENTION The inventor of the present invention has found that, as a member for injecting an injecting material, in place of a conventional rod, there is no seam, almost no cross-sectional deformation occurs, excellent flexibility, Attention was paid to the fact that the use of a hose that can be wound around a winding means such as a drum can solve all of the above-mentioned problems of the prior art. According to the present invention, there is provided an injection material injection device for inserting an injection material through a bored hole formed in a ground into which an injection material is to be injected and injecting the injection material through the tubular member. The tubular member is configured as a hose, and the hose is a radially innermost synthetic resin layer, a reinforcing layer covering the radially outer side of the synthetic resin layer, and a synthetic rubber layer covering the radially outer side of the reinforcing layer. The reinforcing layer includes a radially inner synthetic fiber layer and a radially outer steel wire layer, and the hose has a packer for preventing the injection material from flowing backward in the borehole. Interposed,
A pressure measuring means for measuring the injection pressure is provided at the tip of the hose, and the packer is arranged at a predetermined position of the injection member tubular member, and can be expanded and contracted by filling and discharging a fluid therein. A rubber packer, an upstream rubber fixing member fixed to the upstream end of the rubber packer and fixed to the tubular member for the injection material, and a rubber fixed to the downstream end of the rubber packer and fixed to the tubular member for the injection material. A slidable downstream rubber fixing bracket, and a slide pipe is fixed to an outer surface of the downstream rubber fixing bracket,
A plug member fixed to the injection member tubular member is disposed inside the slide pipe, and the plug member and the inner wall surface of the slide pipe are relatively slidable and the injection member is And an annular space is formed by the tubular member for the injection material, the downstream rubber fixing member, the member for the plug, and the slide pipe. Here, when air, gas, or other working fluid enters, fills, or discharges into the annular space, the space inside the rubber packer, the annular space and the annular space are provided in the downstream rubber fixing bracket. It is preferable that a communication path communicating with is formed. Alternatively, it is preferable that the annular space is a closed space and the inside thereof is maintained in a vacuum state. In this case, in order to maintain the annular space in a vacuum state, the downstream rubber fixing bracket and the plug member are
It is necessary that a portion slidably in contact with the tubular member for injection material or the slide pipe is sufficiently sealed. It should be noted that the slide pipe can be applied to any material as long as an injection material (eg, mortar) does not easily adhere thereto.
For example, a so-called "steel pipe" or a resin pipe can be used as the slide pipe. And
In the case where re-boring becomes necessary after the hardening of the injection material, the material is preferably made of a material that is easily broken by the drilling equipment. In addition, in this specification, "injection material"
The wording is used in a generic sense such as grout or chemical solution. According to the present invention having the above-described structure,
Since a seamless hose is inserted into the boring hole, it is not necessary to perform complicated rod addition and rod separation. Therefore, the labor is greatly reduced as compared with the conventional injection operation. Further, since the diameter of the hose can be made smaller than that of the rod, it is not necessary to increase the diameter of the boring hole into which the rod is inserted, and the labor required for excavation is reduced. Here, since the innermost layer in the radial direction of the hose used in the present invention is made of a synthetic resin, the resistance in the pipe is extremely reduced, and the weight and rigidity of the hose are improved. . In addition, the pressure-resistant performance is obtained by the synthetic fiber layer radially inward of the reinforcing layer covering the synthetic resin layer in the radial direction, and the elongation of the hose is minimized by the steel wire layer radially outward of the synthetic fiber layer. (Obtaining tensile resistance). The synthetic rubber layer covering the outer side of the reinforcing layer in the radial direction (for example, the outermost layer of the hose) provides a hose excellent in pressure resistance and abrasion resistance. Based on such a configuration, the hose used in the present invention has almost no cross-sectional deformation, is excellent in flexibility, can be wound around a drum, and has an elongation of 1 hour.
% Or less, and has excellent characteristics that the resistance in the tube is small. In the present invention, since the packer used is made of a flexible material and can be expanded by fluid pressure, a pressure fluid such as compressed air is supplied through a flexible material tube for supplying fluid pressure. If supplied, the deformation of the soft ground is reduced,
The gap between the inner peripheral surface of the boring hole and the outer peripheral surface of the packer can be sealed in a liquid-tight manner. Further, in the present invention, the injection pressure is measured by the pressure measuring means provided at the tip of the hose during the injection of the injection material (injection pressure measuring step). It becomes possible to inject the injection material at a suitable pressure. As a result, the construction management accuracy of the injection process is improved, and the quality of the improved ground is also good. In addition to the above, according to the present invention, an injection step, a step of waiting for the injected injection material to harden,
The so-called "step-down" in which the boring hole drilling step is repeated from above (the side closer to the ground surface) to below (the deeper side) is possible. Since the step-down is in accordance with the principle of the injection of the injection material, the working efficiency is significantly improved. On the other hand, according to the present invention, when the risk of collapse, leak, etc. in the injection hole is small, so-called "step-up" in which the injection operation is performed continuously from below to above.
Can be performed. As a result, work efficiency is further improved. Further, by providing a drilling means at the end of the hose, it is possible to save equipment and labor for drilling a borehole. Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a case where an injection method is applied to a ground G to be improved in a tunnel T, for example.
In FIG. 1, a boring hole 10 is formed in a ground G to be improved by means not shown. A hose 12 is inserted into the boring hole 10. In FIG. 1, reference numeral 2 denotes a hose reel for the hose 12, reference numeral 4 denotes a pump for supplying the injection material, and reference numeral 6 denotes a mixer for mixing and stirring the injection material. As shown in FIG. 2, the hose 12 includes a radially innermost synthetic resin layer 12-1 and a synthetic fiber layer 12-2 covering the radially outer side of the synthetic resin layer 12-1. The hose 12 is composed of a steel wire layer 12-3 on the outer side in the radial direction and a synthetic rubber layer 12-4 which is the outermost layer in the radial direction of the hose 12. In addition, in this specification, the synthetic fiber layer 12-2 and the steel wire layer 12-3 may be collectively referred to as a "reinforcing layer". As described above, the synthetic resin layer 1 of the hose 12
2-1 extremely reduces the resistance in the pipe and improves the weight and rigidity of the hose. In addition, the synthetic fiber layer 12-
No. 2 gives the pressure resistance to the hose, and the steel wire layer 12-3 suppresses the elongation of the hose as much as possible, and brings about the tensile resistance. The synthetic rubber layer 12-4 constituting the outermost layer of the hose 12 makes the hose excellent in pressure resistance and wear resistance. In addition, specific examples of the dimensions of the hose 12 (Table 1)
No. 1 to 3) are shown in Table 1 below. [0024] Referring again to FIG. 1, the hose 12 is provided with a packer 14 made of a flexible material. As shown in FIG.
4 is connected to a tube 16 made of a flexible material. Here, the flexible material constituting the packer 14 is a tube 16
Working fluid (for example, compressed air or nitrogen gas) supplied from
There is no particular limitation as long as it is inflatable. The flexible material constituting the tube 16 may be any material that is disposed along the boring hole 10 and has flexibility necessary to connect the pressure fluid source (not shown) to the packer 14. There is no special limitation. The packer 14 is in the contracted state shown in FIG. 3 during the step of piercing the boring hole 10 (and the standby step of waiting for the hardening of the injection material described later). Then, when it is time to inject the injection material, the working fluid is supplied to the expanded state shown in FIG. When the packer 14 is in the expanded state (FIG. 4), the outer peripheral surface 14S (FIG. 3)
The space L (the space between the outer peripheral surface 14S of the packer and the inner peripheral surface 10S of the boring hole: see FIG. 3) without contacting the inner peripheral surface 10S (FIG. 4) of the boring hole 10 and deforming the ground G more than necessary. ) Is sealed in a liquid-tight manner. In addition, Packer 1
Details of 4 will be described later with reference to FIGS. According to the illustrated embodiment, even if the injection material is injected in a deep region in the ground, the hose 12 is continuous without any seam, so that the rod refilling operation is performed in the conventional manner. No need. In addition, the hose 12 having the laminated structure has sufficient strength and is smaller in diameter than the rod, so that the diameter of the boring hole 10 does not need to be increased, and the labor of the drilling work is correspondingly increased. Is reduced. In the illustrated embodiment, as shown in FIG. 5, a pressure measuring means (pressure gauge) for measuring the injection pressure of the injection material injected from the nozzle 28 is provided at the tip of the hose 12.
30 are provided. Then, the measurement result of the pressure gauge 30 is transmitted to the control means 32 via the signal transmission line SL1, and the injection pressure is recorded in the recorder 34 in real time. The signal transmission line SL1 is made of a flexible stranded wire, and together with the hose 12, the hose reel 2
Even if it is wound around, it will not be cut. As shown in FIG. 5, if the construction is such that the injection pressure of the injection material can be constantly measured in real time, the injection material can be injected in an optimum state, and the construction management accuracy of the injection method is improved. The quality of the improved ground is improved. FIGS. 6 and 7 show the details of the packer 14. The slide type packer, which is generally designated by the reference numeral 14, is disposed at a predetermined position of the hose 12 and fills and discharges a fluid (for example, air) into the inside. The rubber packer 102 is capable of expanding and contracting, an upstream rubber fixing member 104 fixed to the upstream end (in the direction indicated by the arrow U) of the rubber packer 102 and fixed to the hose 12, and a downstream side of the rubber packer 102 ( (In the direction indicated by arrow D)), and a downstream-side rubber fixing member 112 fixed to the end portion. The downstream rubber fixing bracket 112 is provided with a sliding means 11 such as an O-ring.
4 is configured to be slidable with respect to the hose 12. A slide pipe 116 is fixed to the outer surface 112S of the downstream rubber fixing member 112, and a plug member 118 is disposed inside the slide pipe 116 (inside in the radial direction). Plug member 1
Reference numeral 18 is fixed to the downstream end of the hose 12, and is configured to be slidable on the inner wall surface 116S of the slide pipe 116 by a sliding means such as an O-ring 120, for example. The space inside the slide pipe 116 in the radial direction is sealed against the injection material by the plug member 118. The hose 12 and the downstream rubber fixing bracket 112
The plug member 118 and the slide pipe 116 form an annular space 130. A communication passage 132 communicating the space I inside the rubber packer 102 with the annular space 130 is provided in the downstream rubber fixing member 112.
Are formed, and constitute a flow path when a working fluid such as air enters, fills, and discharges from the internal space I of the rubber packer 102 into the annular space 130. When the embodiment of the packer shown in detail in FIGS. 6 and 7 is operated, the working fluid supply pipe (not shown) (for example, the upstream rubber fixing fitting 104) is moved from the state shown in FIG.
When the working fluid is supplied to the internal space of the rubber packer 102 through a pipe disposed through the pipe; tubes 16) shown in FIGS. 3 and 4, the packer 102 expands as shown in FIG. 10 is closed (expanded state). At this time, the downstream rubber fixing member 112 slides on the surface of the hose 12 and moves to the upstream side (arrow U side). In this expanded state, the injection material is filled (not shown) in the region of the boring hole 1 on the downstream side (arrow D side) of the slide type packer 14 by the hose 12. At this time, the filled injection material is prevented from entering the slide pipe 116 by the plug member 118. When the working fluid is discharged from the internal space I of the packer 102 via the working fluid supply pipe (not shown) after the filling operation of the filling material is completed, the packer 102 returns to the contracted state. When the downstream rubber fixing member 112 moves to the downstream side D (injection material filling side), the downstream rubber fixing member 112 slides on the hose 12 by the O-ring 114 and is fixed to the downstream rubber fixing member 112. Since the slide pipe 116 slides with respect to the plug member 118, the downstream rubber fixing member 112 moves toward the downstream side D without moving the plug member 118. Here, even if the filling material is filled up to the vicinity of the plug member 118 in the expanded state of FIG. 7, the plug member 118 does not move to the downstream side D (the filling material filling side), and Since the rubber fixing member 112 is moved to the downstream side D and the packer 102 is contracted, the filled injection material interferes with the downstream rubber fixing member 112 and the packer 10 is shrunk.
It does not prevent the shrinkage of 2. The only member that can enter the filled injection material is the slide pipe 116. However, since the thickness of the slide pipe 116 is much thinner than other members, it is extremely difficult to enter the inside of the injection material. It can easily penetrate. Therefore, it is possible to prevent a problem in the conventional slide-type packer, that is, the movement of the downstream-side rubber fixing member 112 from being hindered by the presence of the filled injection material. In other words, when the packer 102 contracts from the state of FIG. 7 to the state of FIG.
Moves to the downstream side D, but only the slide pipe 116 having a small thickness in the radial direction comes into contact with the filled injection material and penetrates. There is no hindrance to moving to side D. When the downstream rubber fixing member 112 moves to the downstream side D, the annular space 130 also contracts, and the working fluid inside the annular space 130 is compressed. However, the working fluid in the annular space 130 is discharged from the inner space I through the communication passage 132 through a piping system (not shown). Therefore, the annular space 1
It is completely prevented that the working fluid in the 30 is compressed and the elastic repulsive force of the compressed working fluid prevents the downstream rubber fixing member 112 from moving to the downstream side D. The slide type packer shown in FIGS. 8 and 9 has substantially the same configuration as the slide type packer shown in FIGS. 6 and 7, a communication path (FIG. 6, FIG. 6) for communicating the annular space 130 with the internal space I of the packer 102.
7, a flow path indicated by reference numeral 132) is not provided, and the pressure in the annular space 130 is reduced to a substantially vacuum state. The annular space 130 is hermetically sealed by a sealing member (not shown). That is, in the packer shown in FIGS. 8 and 9, the annular space 130 is a closed space, and the inside thereof is configured to be maintained in a vacuum state. Then, in order to maintain the annular space 130 in a vacuum state, the downstream rubber fixing bracket 112 and the hose 12
Slidably contact the plug member 118
And the slide pipe 116 are slidably in contact with each other, and are sufficiently sealed. When the working fluid is supplied from the contracted state shown in FIG. 8 to the internal space I of the packer 102 by the working fluid supply system (the tube 16 shown in FIGS. 3 and 4), the expanded state shown in FIG. 9 is obtained. . At that time, the downstream rubber fixing bracket 11
By moving 2 to the upstream side U, the annular space 130 is enlarged. Here, as described above, since the annular space 130 is substantially depressurized to a vacuum state, when the expanded state shown in FIG.
(A pressure difference between left and right in FIG. 9)
Due to the pressure difference, the downstream rubber fixing member 112 is constantly urged to the downstream side D (the right side in FIG. 9). Therefore, when the packer is contracted, the movement of the downstream rubber fixing member 112 to the downstream side D is further facilitated. The embodiment shown in FIG. 10 has the same structure as the embodiment shown in FIGS. 1-9, except that a drilling means 40 such as a drill is provided at the tip of the hose 12. The excavating means 40
It is installed in such a manner that it does not hinder the injection of the injection material supplied via the hose 12, and may be a device for hydraulic boring as well as a drill. In FIG. 1-10, signal transmission line SL
1 (FIG. 5) and the working fluid supply pipe (tube 16: FIGS. 3 and 4) are arranged separately from the hose 12,
As shown in FIG. 11, it may be configured integrally with the hose 12. The hose 12A used in the embodiment shown in FIG.
This is a type in which the signal transmission line SL1 and the tube 16 are integrally embedded. And the synthetic fiber layer 12
Transmission line S at the boundary between steel-2 and steel wire layer 12-3
L1 and tube 16 are embedded. The portion where the signal transmission line SL1 and the tube 16 are embedded is preferably a boundary between layers, but there is no limitation as to which boundary between the layers. Further, the boundary portion in which the signal transmission line SL1 is embedded and the boundary portion in which the tube 16 is embedded may be a boundary portion of another layer. The effects of the present invention are listed below. (1) The injection material can be injected into a deep underground region without the need for a conventional rod refilling process. (2) Drilling costs can be reduced by reducing the diameter of the borehole. (3) It is possible to prevent the injected material from flowing backward in the borehole. (4) Even when constructed on soft ground, the upper and lower parts of the packer can be separated in a boring hole in a liquid-tight manner without deforming the ground. (5) Injection method by "step-down" can be applied, and continuous injection method by "step-up" can be applied depending on the ground condition. (6) Measure the injection pressure of the injection material in real time,
Since the construction management accuracy is improved, the quality of the improved ground is also improved. (7) If a packer as shown in FIG. 6-9 is used, even if the filling material is filled up to the vicinity of the packer, expansion and contraction of the packer are not prevented. (8) By providing a drilling means at the end of the hose, equipment and labor for various operations can be saved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional front view showing a first embodiment of the present invention. FIG. 2 is a cross-sectional view showing a laminated structure of a hose used in the present invention. FIG. 3 is a sectional front view showing one step in the embodiment of the present invention. FIG. 4 is a sectional front view showing a step different from that shown in FIG. 3; FIG. 5 is a block diagram showing a circuit for measuring an injection pressure. FIG. 6 is an enlarged cross-sectional front view showing a state where an example of a packer used in the present invention is contracted. FIG. 7 is an enlarged front sectional view showing a state where the packer shown in FIG. 6 is expanded. FIG. 8 is an enlarged front sectional view showing a state in which a packer different from those shown in FIGS. FIG. 9 is an enlarged front sectional view showing a state where the packer shown in FIG. 8 is expanded. FIG. 10 is a sectional front view showing another embodiment of the present invention. FIG. 11 is a cross-sectional view showing a laminated structure of a hose used in still another embodiment of the present invention. [Description of Signs] G: Ground 10: Boring hole 10S: Inner peripheral surface 12, 12A of boring hole: Hose 12-1: Synthetic resin layer 12-2: Synthetic fiber layer 12-3 Steel wire layer 12-4 Synthetic rubber layer 14 Packer 14S Packer outer peripheral surface 16 Tube made of flexible material for supplying pressure fluid A Pressure fluid C: Injecting material for ground improvement (injected liquid) L: Space between outer peripheral surface of packer and inner peripheral surface of boring hole 30: Pressure gauge (pressure measuring means) 40: Excavating means

Continuing on the front page (72) Inventor Kiminori Takahashi 1-6-4 Moto-Akasaka, Minato-ku, Tokyo Chemi Calgrout Co., Ltd. (72) Inventor Shunichi Yamamoto 1030 Sanza-cho, Gojo-shi, Nara Prefecture Togawa Rubber Manufacturing Co., Ltd. Tokoro Nara Factory (56) References JP-A-59-114320 (JP, A) JP-A-54-21016 (JP, A) JP-A-5-83567 (JP, U) (58) Fields investigated (Int) .Cl. ⁷ , DB name) E02D 3/12 E21F 15/02

Claims (1)

(57) [Claim 1] An injection material for inserting a tubular member into a boring hole cut into a ground to be injected with an injection material and injecting the injection material through the tubular member. In the injection device, the tubular member is configured as a hose, and the hose includes a radially innermost synthetic resin layer, a reinforcing layer that covers a radially outer side of the synthetic resin layer, and a radially outer side of the reinforcing layer. The reinforcing layer includes a radially inner synthetic fiber layer and a radially outer steel wire layer, and prevents the injection material from flowing back into the borehole in the hose. And a pressure measuring means for measuring the injection pressure is provided at the tip of the hose, and the packer is disposed at a predetermined position of the tubular member for the injection material, and is provided with a fluid therein. Expansion by filling and discharging A shrinkable rubber packer, an upstream rubber fixing member fixed to the upstream end of the rubber packer and fixed to the injection member tubular member, and an injection member tubular member fixed to the downstream end of the rubber packer and fixed to the downstream end of the rubber packer And a slide pipe is fixed to an outer surface of the downstream rubber fixture, and the injection member tubular member is provided inside the slide pipe. A plug member fixed to the plug member is disposed, and the plug member and the inner wall surface of the slide pipe are relatively slidable and sealed with respect to the injection material. An annular space is formed by the metal pipe, the downstream rubber fixing bracket, the plug member, and the slide pipe.