JP5781467B2 - Grout production apparatus and grout production method - Google Patents

Description

  The present invention relates to a grout production apparatus and a grout production method for producing a silica sol used as a water glass grout for a ground injection method by mixing an alkaline water glass and an acidic liquid.

  Conventionally, for the purpose of strengthening soft ground or improving ground by stopping groundwater, a ground injection method using a neutral or acidic non-alkaline water glass silica sol has been used. Manufactured by mixing with liquid.

  As shown in FIG. 5, when an acidic solution is added to alkaline water glass for a while, the silica sol has a temporary lowering of pH and a gel time, which is a boundary between the alkaline region and the neutral / acidic region. The shortest gel time (about 3 to 5 seconds or less) is obtained at around pH 8.5. In the process of mixing the alkaline water glass and the acidic liquid, the silica sol is instantly gelled when passing through the pH of around 8.5, which is the shortest gelation time. It is not suitable for use in the ground injection method.

  Therefore, the silica sol used in the ground injection method is a mixture of alkaline water glass and acidic liquid so as to pass through the boundary between the alkaline region and the neutral / acidic region instantaneously in order to produce the instant setting gel without precipitating. It is necessary to do. That is, it is a principle that silica sol is produced by mixing alkaline water glass and acidic liquid in a neutral / acidic region by “adding alkaline water glass to acidic liquid”. As a grout production method for producing this silica sol, disclosed techniques of Patent Documents 1 and 2 have been proposed.

  The manufacturing method disclosed in Patent Document 1 is called a batch method, and is a method in which an alkaline water glass is jetted and mixed into an acidic liquid while stirring the acidic liquid in a preparation tank. The production method disclosed in Patent Document 2 is called a continuous method. At the start of silica sol production, the supply of the acidic liquid is started earlier than the supply of the alkaline water glass. In this method, the supply is terminated later than the supply of alkaline water glass. Thereby, the manufacturing method disclosed in Patent Document 2 is a method in which the state of “adding alkaline water glass to the acidic liquid” is always maintained, and the alkaline water glass and the acidic liquid are mixed.

JP-A-53-80421 JP 2001-247865 A

  However, the manufacturing method disclosed in Patent Document 1 is a batch system in which a silica sol is manufactured by supplying alkaline water glass to a predetermined amount of an acidic liquid in a preparation tank. There is a problem that cannot be done, and it is not used at all now.

  In addition, the production method disclosed in Patent Document 2 requires independent pumps for the alkaline water glass and the acidic liquid, and these independent 2 are used at the start and end of silica sol production. There is a problem that it is necessary to individually control the start and stop of the operation of the pumping pump of the stand.

  At this time, the manufacturing method disclosed in Patent Document 2 needs to start and stop the operation of the two pumping pumps by a predetermined time difference, and it is very difficult to perform this operation manually. There is a problem, and when a control device for automatically performing this operation is introduced, there is a problem that the installation cost of the control device increases.

  Therefore, the present invention has been devised in view of the above-described problems, and the object of the present invention is not to require two independent pumping pumps, and to start and stop the operation of the pumping pumps. It is an object of the present invention to provide a grout production apparatus and a grout production method capable of producing a silica sol having a uniform quality continuously without the necessity of performing the difference in time.

A grout production apparatus according to a first aspect of the present invention is a grout production apparatus for producing a grout by mixing water glass and an acidic liquid, wherein a mixing chamber for mixing water glass with an acidic liquid, and water glass in the mixing chamber. A first system to supply and a second system to supply an acidic liquid to the mixing chamber; the first system is connected to the mixing chamber at one end and a first mixing tank in which water glass is stored. A first pumping pipe connected to the other end; and a first pumping means for allowing water glass to flow into the first pumping pipe from the first mixing tank; and the second system has one end in the mixing chamber. The other end is connected to the second mixing tank in which the acidic liquid is stored and is connected, and the second pressure feeding pipe having a volume smaller than the first pressure feeding pipe, and the acidic liquid from the second mixing tank to the second pressure feeding pipe A second pumping means for allowing the mixing chamber to flow, wherein the mixing chamber is in contact with the mixing chamber. With water glass from water glass stream bottom provided at one end of the first pumping tube is free falling is released to a state with a pressure by the second pumping means, said first connecting to the mixing chamber The acidic liquid is ejected from the acidic liquid ejecting section provided at one end of the two pressure feeding pipes, and the acidic liquid ejecting section is closed at one end face of the second pressure feeding pipe connected to the mixing chamber, and A discharge hole is formed in a side surface of one end of the second pressure-feed pipe connected to the mixing chamber, and a covering material that is spread by the pressure of the acidic liquid applied by the second pressure-feed means from the inside covers the discharge hole. It is characterized by being attached in this way.

Grout manufacturing apparatus according to the second invention, Oite the first shot bright, the mixing chamber, from the acid liquid ejection portion provided at one end of the second pumping pipe connected to the mixing chamber, the second The acidic liquid is injected in a state where the pressure of the acidic liquid by the pressure feeding means is 0.1 to 0.4 N / mm ² .

In the grout production apparatus according to a third aspect of the present invention, in the first aspect or the second aspect , the first system is provided by branching from the first pumping pipe, and the water glass remaining in the first pumping pipe is provided in the first pump. A return hose that returns to one mixing tank, and a switching valve provided at a portion where the return hose branches from the first pressure feeding pipe, and the switching valve is configured to remove water glass remaining in the first pressure feeding pipe. When returning to the said 1st mixing tank, the flow path of a water glass can be switched to the said return hose, It is characterized by the above-mentioned.

A grout production method according to a fourth aspect of the present invention is a grout production method for producing grout by mixing water glass and an acidic liquid, wherein one end is connected to a mixing chamber for mixing the water glass with the acidic liquid and the water glass is mixed. By a first system having a first pumping pipe whose other end is connected to the first mixing tank in which water is stored and a first pumping means for flowing water glass from the first mixing tank into the first pumping pipe, Water glass is discharged in the mixing chamber from the lower part of the water glass flow provided at one end of the first pumping pipe connected to the mixing chamber, and is freely dropped, and water glass is supplied to the mixing chamber, and the mixing chamber A second pumping pipe having one end connected to the second mixing tank in which the acidic liquid is stored and the other end connected to the second pumping pipe, and a second pumping that causes the acidic liquid to flow into the second pumping pipe from the second mixing tank. A second system comprising means for The acidic liquid is ejected from the acidic liquid ejecting portion provided at one end of the second pressure feeding pipe connected to the combined chamber in the mixing chamber in a state of being pressurized by the second pressure feeding means, and the acidic liquid is injected into the mixing chamber. A grout mixing step to supply, wherein the grout mixing step simultaneously starts the first pressure feeding means and the second pressure feeding means, and the acidic liquid is supplied from the second pressure feeding pipe having a volume smaller than that of the first pressure feeding pipe. By supplying, it has a mixing start process which starts discharge of the acidic liquid from the said acidic liquid injection part prior to discharge | release of the water glass from the said water glass flow lower part, It is characterized by the above-mentioned.

In the grout production method according to a fifth aspect of the present invention, in the fourth aspect of the invention, the grout mixing step includes the first pumping unit and the second pumping unit in a state where the acidic liquid has a pressure applied by the second pumping unit in the mixing chamber. Mixing to stop the pumping means at the same time and stop the discharge of the water glass from the lower part of the water glass prior to the injection of the acidic liquid due to the residual pressure inside the second pumping pipe from the acidic liquid injection unit It has a stop process.

A grout production method according to a sixth aspect of the present invention is the method according to the fifth aspect , wherein, after the grout mixing step, a switching valve provided at a branch portion of a return hose provided by branching from the first pumping pipe is operated. The water glass flow path is switched to the return hose, and the water glass returning step of returning the water glass remaining in the first pressure-feed pipe after the mixing stop step to the first mixing tank is provided. .

The grout production method according to a seventh aspect of the present invention includes the grout mixing step having the mixing start step and the mixing stop step after the water glass return step in the sixth invention, the water glass return step, By alternately repeating the grout mixing step, the grout is produced by continuously mixing the water glass and the acidic liquid.

According to the first to third aspects of the present invention, silica sol of uniform quality is produced without requiring two independent pumping pumps and without having to start operation of the pumping pump by a predetermined time difference. It is possible to provide a grout production apparatus that can handle the above.

In particular, according to the first invention, in the mixing chamber, the acidic liquid is jetted in a planar shape to the side of the acidic liquid jetting unit, upward and obliquely upward, and mixed with water glass discharged from above, It is possible to provide a grout production apparatus capable of producing a uniform quality silica sol with good mixing and stirring of water glass and acidic liquid.

In particular, according to the second invention, it is possible to produce a silica sol of uniform quality without requiring two independent pumps and without having to stop operation of the pumps by a predetermined time difference. It is possible to provide a grout production apparatus that can be used.

In particular, according to the third invention, when the water glass remaining in the first pressure feeding pipe is returned from the return hose to the first mixing tank by free fall, and when the operation of the pressure feeding pump is started again, The discharge of the water glass from the lower part of the water glass can start the acidic liquid injection from the acidic liquid injection part in advance for a predetermined time, and can produce a silica sol of uniform quality continuously. A grout production apparatus can be provided.

According to the fourth to seventh inventions, the silica sol of uniform quality is not required without requiring two independent pumping pumps and without starting and starting the pumping pump by a predetermined time difference. It can be manufactured.

In particular, according to the fourth invention, it is possible to produce a silica sol having a uniform quality without precipitating a quick setting gel in the mixing start step.

In particular, according to the fifth aspect of the present invention, it is possible to produce a silica sol of uniform quality without precipitating a quick setting gel in the mixing stopping step.

In particular, according to the sixth invention, when the water glass remaining in the first pressure feeding pipe is returned from the return hose to the first mixing tank by free fall, and the operation of the pressure feeding pump is started again, It is possible to start the acidic liquid injection from the acidic liquid injection unit for a predetermined time from the free fall of the water glass from the lower part of the water glass flow, and to produce a uniform quality silica sol without precipitating a quick setting gel. Can be manufactured.

In particular, according to the seventh invention, by alternately repeating the water glass returning step and the grout mixing step, it is possible to continuously mix the water glass and the acid liquid to produce the grout.

It is a front view which shows the grout manufacturing apparatus which concerns on this invention. It is a front view which shows the mixing chamber of the grout manufacturing apparatus which concerns on this invention. It is a front view which shows other embodiment of the mixing chamber of the grout manufacturing apparatus which concerns on this invention. It is a front view which shows the return hose and switching valve | bulb of the 1st system | strain of the grout manufacturing apparatus which concerns on this invention. It is a relationship figure which shows the gelatinization time of silica sol, and pH. It is a front view which shows the grout manufacturing apparatus which concerns on a comparative example.

  Hereinafter, an embodiment for implementing a grout manufacturing apparatus to which the present invention is applied will be described in detail with reference to the drawings.

  As shown in FIG. 1, the grout manufacturing apparatus 1 to which the present invention is applied mixes the water glass A stored in the first mixing tank 11 and the acidic liquid B stored in the second mixing tank 21 in the mixing chamber 30. Then, the silica sol C is used for storing in the storage tank 4.

  The grout manufacturing apparatus 1 to which the present invention is applied supplies water glass A to the mixing chamber 30 by the first system 10 and supplies the acidic liquid B to the mixing chamber 30 by the second system 20. In the grout production apparatus 1 to which the present invention is applied, a line mixer (not shown) is further provided between the mixing chamber 30 and the storage tank 4 to facilitate the mixing of the water glass A and the acidic liquid B. There may be.

  The first system 10 includes a first pumping pipe 12 having one end on the downstream side connected to the mixing chamber 30 and the other end on the upstream side connected to the first mixing tank 11, and the first from the first mixing tank 11. And a first pumping means 13 configured by a pumping pump that causes the water glass A to flow into the pumping pipe 12.

  In the first system 10, a water glass flow lower part 12 a is provided at one end of the first pumping pipe 12 connected to the mixing chamber 30. Furthermore, the first system 10 is provided at a portion where the return hose 14 branches off from the first pressure feed pipe 12 and the return hose 14 branches off from the first pressure feed pipe 12, and the flow path of the water glass A is returned to the return hose. 14 and a switching valve 15 that switches to 14.

  The second system 20 includes a second pumping pipe 22 in which one end on the downstream side is connected to the mixing chamber 30 and the other end on the upstream side is connected to the second mixing tank 21. And a second pumping means 23 configured by a pump for feeding the acidic liquid B into the pumping pipe 22.

  In the second system 20, an acidic liquid injection unit 24 is provided at one end of a second pumping pipe 22 connected to the mixing chamber 30. The second system 20 includes a second pumping tube 22 having an inner diameter smaller than that of the first pumping tube 12, an extended second pumping tube 22 shorter than the first pumping tube 12, or from the first pumping tube 12. By providing the second pumping tube 22 with a small inner diameter and a short extension, the second pumping tube 22 having a volume smaller than that of the first pumping tube 12 is provided.

  As the first pumping means 13 and the second pumping means 23, one double pump is used without using an independent pumping pump. The 1st pumping means 13 and the 2nd pumping means 23 are not restricted to this, An independent pumping pump can also be used, respectively.

  The mixing chamber 30 is continuously provided so as to increase in diameter from the water glass flow lower portion 12a of the first pumping tube 12, and as shown in FIG. 2, an outer tube 31 opened downward is formed. One end of the mixing chamber 30 where the acidic liquid injection unit 24 of the second pumping pipe 22 is provided is connected from the side, and an inner pipe 32 is formed inside the outer pipe 31 as shown in FIG.

  In the acidic liquid injection section 24, the end face 22a at one end of the second pressure feeding pipe 22 connected to the mixing chamber 30 is closed, and the discharge hole 22c is formed in the side face 22b. The covering material 24a is formed so as to cover the discharge hole 22c. Installed and provided.

  The discharge holes 22c are composed of one or two or more, and are formed with a predetermined number and size according to the discharge amount of the acidic liquid B per time, and the dischargeable area is determined. The discharge hole 22c is formed in a substantially circular shape, but is not limited thereto, and may be formed in a slit shape or in any shape.

The covering material 24a is made of tube-like rubber having elasticity, and when the acidic liquid B is discharged from the discharge hole 22c, the pressure P _B of the acidic liquid B pumped by the second pumping means 23 is from the inside. It is spread by acting. The covering material 24a is not limited to this, and any material may be used as long as it has elasticity. For example, a plastic ring or a vinyl ring may be used.

  As shown in FIG. 3, the covering material 24a is provided with a groove 22d on the side surface 22b at one end of the second pumping tube 22 along the outer periphery, and a discharge hole 22c is formed in the portion where the groove 22d is provided. Then, a rubber O-ring may be attached so as to cover the discharge hole 22c along the groove 22d.

  Next, a method for producing a silica sol by a grout production method to which the present invention is applied will be described in detail with reference to the drawings.

  As shown in FIG. 1, the grout manufacturing method to which the present invention is applied mixes the water glass A stored in the first mixing tank 11 and the acidic liquid B stored in the second mixing tank 21 in the mixing chamber 30. The silica sol C is produced by the grout mixing step W.

  As the water glass A used for the grout production method to which the present invention is applied, any glass may be used, but it is particularly preferable to use a glass having a molar ratio of 3 or more. The acidic liquid B may be any sulfuric acid, phosphoric acid, sodium bisulfate, or the like, but it is particularly preferable to use dilute sulfuric acid having a concentration of 60% to 75%. In addition, divalent and trivalent metal salts such as sulfate band, alum and magnesium sulfate can be added to the acidic liquid B. In addition, it is desirable that the discharge amounts of the water glass A and the acidic liquid B are equal.

  The grout mixing step W has a mixing start step X for starting mixing of the water glass A and the acidic liquid B and a mixing stop step Y for stopping mixing of the water glass A and the acidic liquid B. it can.

  In the mixing start process X, the water glass A is pumped by the pump of the first pumping means 13 and flows into the first pumping tube 12 from the first preparation tank 11. The acidic liquid B is pumped by the pump of the second pumping means 23 and flows into the second pumping pipe 22 from the second preparation tank 21. At this time, the 1st pumping means 13 and the 2nd pumping means 23 will be started simultaneously using one 2 type pump, and the inflow to the 1st pumping pipe 12 of water glass A, and acidic liquid Inflow of B into the second pumping pipe 22 starts simultaneously.

The water glass A that has flowed into the first pumping pipe 12 is pumped by the first pumping means 13 to the water glass flow lower part 12 a of the first pumping pipe 12. The acidic liquid B that has flowed into the second pressure feeding pipe 22 is pressurized by the second pressure feeding means 23 and is pumped to the acidic liquid injection unit 24 of the second pressure feeding pipe 22. At this time, since the volume of the first pumping pipe 12 is larger than that of the second pumping pipe 22, the first pumping pipe 12 can be started even if the first pumping means 13 and the second pumping means 23 are simultaneously started with the same discharge amount. When the acidic liquid B reaches the acidic liquid injection part 24 of the second pumping tube 22, the water glass A reaches the predetermined time T ₁ earlier than the water glass A reaches the lower water glass flowing part 12 a.

  In the grout mixing step W, the water glass A that has flowed into the first pumping pipe 12 is provided with the first pumping pipe 12 at a position higher than the second pumping pipe 22 as shown in FIG. After being pumped and reaching the water glass flow lower part 12 a of the first pressure feed pipe 12, the water glass A is supplied from the water glass flow lower part 12 a of the first pressure feed pipe 12 to the mixing chamber 30. In the water glass A supplied to the mixing chamber 30, the discharge pressure of the first pumping means 13 is adjusted so that almost no pressure is applied in the water glass flow lower part 12 a of the first pressure feeding tube 12, and the water glass A in the mixing chamber 30 is adjusted. It is discharged from the lower flow 12a and falls free.

The acidic liquid B that has flowed into the second pressure feeding pipe 22 is pressurized by the second pressure feeding means 23 and reaches the acidic liquid injection section 24 of the second pressure feeding pipe 22, and then the acidic liquid injection section 24 of the second pressure feeding pipe 22. The acidic liquid B is supplied to the mixing chamber 30. The discharge pressure of the second pumping means 23 is adjusted so that the acidic liquid B supplied to the mixing chamber 30 remains in the pressurized liquid P _B in the acidic liquid injection section 24 of the second pressure feeding pipe 22, and the mixing chamber At 30, the liquid is injected from the acidic liquid injection unit 24. The pressure P _B, it is desirably 0.1 N / mm ² or more, in particular, it is desirable that 0.2~0.4N / mm ^2.

As shown in FIGS. 2 and 3, the acidic liquid B is ejected from the ejection hole 22 c when ejected from the acidic liquid ejecting section 24 of the second pumping pipe 22, and the covering material 24 a is moved inside by the applied pressure P _B. Push from. The acidic liquid B passes through the gap between the side surface 22b of the second pumping tube 22 and the inner surface of the spread covering material 24a, and from the upper end 24b of the covering material 24a to the side of the acidic liquid injection section 24, above And it will inject in a planar shape toward the diagonally upward direction.

  In the mixing chamber 30, the acidic liquid B is jetted in a planar shape to the side of the acidic liquid jetting unit 24, upward and obliquely upward, and is mixed with the water glass A that freely falls from above. Thereby, the grout manufacturing method to which the present invention is applied is such that the water glass A and the acidic liquid B are mixed and stirred well, and the water glass A is mixed with the acidic liquid B sprayed in a planar shape. By this, it can be set as the state which "adds alkaline water glass in an acidic liquid", manufactures silica sol C, without precipitating a quick setting gel, and stores the silica sol C of uniform quality in the storage tank 4 Is possible.

In the mixing start process X, the acid liquid B is preceded by the time T ₁ before the discharge of the water glass A from the water glass flow lower part 12a of the first pressure feed pipe 12 in the mixing chamber 30. Injection from the injection unit 24 is started. As a result, the water glass A is mixed with the acidic liquid B later, and can be in a state of “adding alkaline water glass into the acidic liquid”. C can be manufactured. The time T ₁ is set according to the pressure P _B , the number and size of the discharge holes 22c, the expansion / contraction performance of the covering material 24a, the adhesion to the inner tube 32, and the like. It is desirable to set it to about 2 seconds.

The first pumping unit 13 and the second pumping unit 23 are simultaneously stopped in the mixing stop process Y by using one double pump. At this time, the discharge of the water glass A from the water glass flow lower portion 12a of the first pumping tube 12 is immediately stopped. Predetermined contrast, acid liquid B, because the second pumping means 23 in a state with a residual pressure P _R in the interior of the second pumping pipe 22 after pump stop is stopped, the stop of the supply of water glass A supplied with a delay time T ₂ of the is to be stopped.

In the mixing stop process Y, the acidic liquid B is discharged by the time T ₂ later than the discharge of the water glass A from the water glass flow lower part 12a of the first pressure feeding pipe 12 in the mixing chamber 30. The injection from 24 is stopped. Thereby, the grout manufacturing method to which the present invention is applied precedes the discharge of the water glass A from the water glass flow lower part 12a of the first pumping pipe 12 even when the mixing of the water glass A and the acidic liquid B is stopped. The silica sol C can be produced without precipitating a quick-set gel, and the uniform quality silica sol C can be stored in the storage tank 4. It can be stored.

If the time T ₂ is too long, a large amount of the acidic liquid B is mixed with the silica sol C stored in the storage tank 4 without being mixed with the water glass A, so that the silica sol having a desired pH is mixed. It becomes difficult to produce C. For this reason, it is desirable that the time T ₂ is set to about 1 to 2 seconds, for example, similarly to the time T ₁ .

  The grout manufacturing method to which the present invention is applied can include a water glass returning step Z as shown in FIG. In the water glass returning process Z, after the mixing stop process Y, the switching valve 15 provided at the portion where the return hose 14 branches from the first pressure feeding pipe 12 after the first pressure feeding means 13 is stopped is manually or electrically operated. To switch the flow path of the water glass A to the return hose 14.

  In the water glass return process Z, the water glass A remaining in the first pressure feed pipe 12 after the mixing stop process Y is freely dropped from the return hose 14 to the first mixing tank 11 without using a pressure feed pump. The water glass A is returned to a state where the water glass A does not remain in the first pressure-feed pipe 12 downstream of the switching valve 15. Thereby, the grout manufacturing method to which the present invention is applied is such that after the water glass returning step Z, the grout mixing step W is performed again through the mixing start step X, and the inside of the first pumping tube 12 is placed in the water glass A The water glass A is supplied to the mixing chamber 30 while being filled.

For this reason, the grout manufacturing method to which the present invention is applied, even when the mixing start step X is performed again, the time from the release of the water glass A from the water glass flow-down part 12a of the first pumping tube 12 in the mixing chamber 30 injection from the acidic liquid ejection portion 24 of the second pumping pipe 22 is started prior by T _1. Thereby, the grout manufacturing method to which the present invention is applied can always be in a state of “adding alkaline water glass into the acidic liquid” by mixing the water glass A with the acidic liquid B later, By alternately repeating the water glass returning step Z and the grout mixing step W, it becomes possible to continuously produce silica sol C having a uniform quality without precipitating a quick setting gel.

  From the above, the grout manufacturing method to which the present invention is applied does not require the use of two independent pumping pumps as the first pumping means 13 and the second pumping means 23, and the operation of these pumping pumps can be started and stopped. It is possible to easily produce a silica sol C having a uniform quality without the need to introduce a control device for performing a predetermined time difference.

  The silica sol C manufactured by the grout manufacturing method to which the present invention is applied can be injected into the ground using the double pump used as the first pumping means 13 and the second pumping means 23 as it is as an injection pump. . Further, the silica sol C stored in the storage tank 4 can be injected into the ground using an injection pump different from the double pump used as the first pumping means 13 and the second pumping means 23. At this time, the gelation time of the silica sol C is desirably 30 minutes to 1 hour or more.

  As mentioned above, although the example of embodiment of this invention was demonstrated in detail, all the embodiment mentioned above showed only the example of actualization in implementing this invention, and these are the technical aspects of this invention. The range should not be construed as limiting.

Regarding the grout production method to which the present invention is applied, in Example 1 below, a concentration of 24.05% SiO ₂ , a concentration of 6.24% Na ₂ O, a special water glass with a molar ratio of 3.98, and powdered sulfuric acid A 75% dilute sulfuric acid with added bands was used.

  In Example 1, 362 liters of water was added to 138 liters of special water glass, and a total of 500 liters of water glass A was stored in the first compounding tank 11, and 12.5 liters of dilute sulfuric acid was used. In the state where 10 kg of powdered sulfuric acid band was added and water was added, a total of 500 liters of acidic liquid B was stored in the second preparation tank 21 and the grout production method to which the present invention was applied was carried out as follows. The following results were obtained.

  When the water glass A and the acid liquid B were mixed by carrying out the grout production method to which the present invention was applied indoors, the silica sol C could be produced without precipitating an instantaneous gel. Silica sol C had a pH of 2.1 and a gelation time of 10 hours.

Regarding the grout manufacturing method to which the present invention is applied, in the following second embodiment, the first pumping means 13 and the second pumping means 23 are started simultaneously by using one double pump, and the acidic liquid injection unit The start of the injection of the acidic liquid B from 24 was started earlier by 2 seconds (time T ₁ ) than the start of the discharge of the water glass A from the water glass flow-down part 12a. At this time, no instantaneous gel was deposited on the silica sol C stored in the storage tank 4. Note that when the acidic liquid B was pumped to the second pumping pipe 22, the pumping pressure applied to the acidic liquid B by the second pumping means 23 was 0.21 MPa.

Subsequently, in the grout manufacturing method to which the present invention is applied, after 200 liters of silica sol C is continuously manufactured, one double pump is stopped and the first pumping means 13 and the second pumping means 23 are simultaneously connected. When stopped, the discharge of the water glass A from the water glass flow lower part 12a immediately stopped, but the injection of the acidic liquid B from the acidic liquid injection unit 24 stopped late for 2 seconds (time T ₂ ).

  At this time, no instantaneous gel was deposited on the silica sol C stored in the storage tank 4, and the produced silica sol C had a pH of 2.0 and a gelation time of 10.5 hours.

  On the other hand, as a comparative example for the grout manufacturing method to which the present invention is applied, as shown in FIG. 6, the first pumping pipe 91 and the second pumping pipe 92 are connected to the Y-shaped pipe 93 without providing the mixing chamber 30. The grout production apparatus 9 connected in the above was used. At this time, in the grout manufacturing method according to the comparative example, one double pump was used, and the first pumping means 94 and the second pumping means 95 were started and stopped simultaneously.

  At this time, in the grout manufacturing method according to the comparative example, the supply of the water glass A and the acidic liquid B is started simultaneously when starting and stopping the double pump used as the first pumping means 94 and the second pumping means 95. Then, a white flash gel was deposited on the manufactured silica sol C, and the silica sol C stored in the storage tank 96 became non-uniform quality.

  In addition, the above-mentioned Example 1, 2 shows an example of the effect at the time of implementing the grout manufacturing method to which this invention is applied to the last, and invention content is not limited to these.

DESCRIPTION OF SYMBOLS 1: Grout manufacturing apparatus 10: 1st system | strain 11: 1st mixing tank 12: 1st pumping pipe 12a: Water glass lower part 13: 1st pumping means 14: Return hose 15: Switch valve 20: 2nd system | strain 21: 2nd 2 Mixing tank 22: 2nd pumping tube 22a: End surface 22b of 2nd pumping tube: Side surface 22c of 2nd pumping tube: Discharge hole 22d of 2nd pumping tube: Groove 23 of 2nd pumping tube: 2nd pumping means 24: acid liquid jetting section 24a: dressing 24b: top portion of the coating member 30: the mixing chamber 31: outer tube 32: inner tube 4: reservoir a: water glass B: an acidic solution C: a silica sol P _B: pressure P _R: Residual pressure W: Grout mixing process X: Mixing start process Y: Mixing stop process Z: Water glass returning process 9: Comparative grout production apparatus 91: Comparative example first pumping pipe 92: Comparative example second pumping pipe 93 : Y-tube 94 of the comparative example: of the comparative example 1 pumping unit 95: second pumping means Comparative Example 96: Storage tank of the comparative example

Claims (7)

A grout production apparatus for producing grout by mixing water glass and an acidic liquid,
A mixing chamber for mixing water glass with the acidic liquid, a first system for supplying water glass to the mixing chamber, and a second system for supplying acidic liquid to the mixing chamber,
The first system has a first pumping pipe having one end connected to the mixing chamber and the other end connected to a first mixing tank in which water glass is stored, and the first pumping pipe from the first mixing tank. A first pumping means for allowing water glass to flow into
The second system has one end connected to the mixing chamber and the other end connected to a second preparation tank in which an acidic liquid is stored, and a second pressure feed pipe having a volume smaller than the first pressure feed pipe, 2 having a second pumping means for allowing the acidic liquid to flow into the second pumping pipe from the mixing tank;
The mixing chamber is in a state where water glass is released from a water glass flow lower portion provided at one end of the first pressure feeding pipe connected to the mixing chamber and is freely dropped and has a pressure applied by the second pressure feeding means. Then, the acidic liquid is injected from the acidic liquid injection unit provided at one end of the second pumping pipe connected to the mixing chamber,
The acidic liquid injection unit has an end face of one end of the second pumping pipe connected to the mixing chamber closed, and a discharge hole is formed on a side surface of one end of the second pumping pipe connected to the mixing chamber. A grout manufacturing apparatus , wherein a covering material that is spread by an applied pressure of an acidic liquid by the second pumping means from the inside is attached so as to cover the discharge hole . The mixing chamber has an acidic liquid pressure applied by the second pumping means of 0.1 to 0.4 N / mm from the acidic liquid spraying portion provided at one end of the second pumping pipe connected to the mixing chamber. ^2. The grout production apparatus according to claim 1 , wherein the acidic liquid is sprayed in a state of ² . The first system is branched from the first pressure feed pipe, and a return hose that returns water glass remaining in the first pressure feed pipe to the first mixing tank, and from the first pressure feed pipe to the return hose. And a switching valve provided at a branching point,
The switching valve is capable of switching a flow path of water glass to the return hose when returning water glass remaining in the first pressure feeding pipe to the first mixing tank. Item 3. The grout production apparatus according to Item 1 or 2. A grout production method for producing grout by mixing water glass and an acidic liquid,
A first pumping pipe having one end connected to a mixing chamber for mixing water glass with an acidic liquid and the other end connected to a first mixing tank in which water glass is stored, and the first pumping from the first mixing tank. The first system having a first pumping means for allowing the water glass to flow into the tube causes the water glass to be discharged in the mixing chamber from a water glass flow lower portion provided at one end of the first pumping tube connected to the mixing chamber. The second pressure feeding pipe having one end connected to the mixing chamber and the other end connected to the second mixing tank in which the acidic liquid is stored, From an acidic liquid injection unit provided at one end of the second pumping pipe connected to the mixing chamber by a second system having a second pumping means for allowing the acidic liquid to flow from the second mixing tank into the second pumping pipe. The pressure applied by the second pumping means in the mixing chamber The acid liquid is jetted in a state of, provided with a grout mixing step of supplying an acidic liquid to the mixing chamber,
In the grout mixing step, the first liquid feeding means and the second pressure feeding means are started simultaneously, and the acidic liquid is injected by supplying the acidic liquid from the second pressure feeding pipe having a volume smaller than the first pressure feeding pipe. A mixing start step for starting the injection of the acidic liquid from the section prior to the discharge of the water glass from the lower part of the water glass
A grout production method characterized by the above. In the grout mixing step, the acidic liquid has a pressure applied by the second pumping means in the mixing chamber, and simultaneously stops the first pumping means and the second pumping means, 5. The mixing stop step of stopping the discharge of the water glass prior to the injection of the acidic liquid due to the residual pressure inside the second pumping pipe from the acidic liquid injection unit . Grout manufacturing method. After the grout mixing step, the flow path of water glass is switched to the return hose by operating a switching valve provided at a branch portion of a return hose branched from the first pressure feed pipe, and the mixing The grout manufacturing method according to claim 5 , further comprising a water glass returning step of returning water glass remaining in the first pressure feeding tube to the first mixing tank after the stopping step . After the water glass returning step, the grout mixing step having the mixing start step and the mixing stop step is provided, and the water glass returning step and the grout mixing step are alternately repeated, thereby continuously water. The grout production method according to claim 6, wherein the grout is produced by mixing glass and an acidic liquid .

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